diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
index b7b0e6d54..0e5ea68ac 100644
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -1,7 +1,27 @@
 # Contributing to SDWebImage
 
+First of all, we want to thank you for you interest in this project.
+Every contribution matters, this is how we are keeping the project alive. 
+We are all owners, from Olivier who started the project, to the people who use it in their projects and participated in a conversation, improved the documentation, created an example or made any code changes.
+If you want to help, but don't know where to begin, we recommend you start small:
+- it would help a lot if you read: https://opensource.guide/how-to-contribute/
+- read the ongoing discussions to see what the overall status is
+- pitch in the converstations where you feel it's useful. Talk to other people, ask questions if you don't understand something
+- contributing to the documentation or the ongoing converstations is as important as contributing to the code
+
 We want to make contributing to this project as easy and transparent as possible. Here are a few guidelines for making all our lives easier.
 
+## Contribute to ongoing conversations
+
+If you have a valid opinion about something we are talking about, feel free to share it.
+If you also encountered an issue that someone else described, pitch in. Better yet, if you already fixed it in a certain way, share that.
+We focus mostly on the GitHub conversations, but you can also help by going to the [questions tagged with "SDWebImage" on StackOverflow](https://stackoverflow.com/questions/tagged/sdwebimage) and getting involved.
+
+## Improving documentation
+
+A project's documentation is something you can always improve on. Make sure you go through the existing documentation and suggest changes or just create new pieces of documentation.
+Examples are also welcome.
+
 ## Asking questions
 
 We don't use GitHub as a support forum. For any usage questions that are not specific to the project itself, please ask on [Stack Overflow](https://stackoverflow.com/) instead. By doing so, you'll be more likely to quickly solve your problem, and you'll allow anyone else with the same question to find the answer. This also allows maintainers to focus on improving the project for others.
@@ -14,7 +34,7 @@ Doing this helps prioritize the most common problems and requests.
 
 When reporting issues, please include the following:
 
-- The platform name and version (e.g. iOS 8.1)
+- The platform name and version (e.g. iOS 10.0)
 - The library version
 - The integration method (e.g. CocoaPods/Carthage/manually)
 - The version of Xcode you're using
diff --git a/.github/FUNDING.yml b/.github/FUNDING.yml
new file mode 100644
index 000000000..0fc5d708f
--- /dev/null
+++ b/.github/FUNDING.yml
@@ -0,0 +1,3 @@
+# These are supported funding model platforms
+
+open_collective: SDWebImage
diff --git a/.github/ISSUE_TEMPLATE.md b/.github/ISSUE_TEMPLATE.md
index a034b1b21..c39c78278 100644
--- a/.github/ISSUE_TEMPLATE.md
+++ b/.github/ISSUE_TEMPLATE.md
@@ -9,10 +9,10 @@
  Info                    | Value                               |
 -------------------------|-------------------------------------|
  Platform Name           | e.g. ios / macos / tvos / watchos
- Platform Version        | e.g. 11.0 / 10.13.0 / 11.0 / 4.0
- SDWebImage Version      | e.g. 4.2.0 / 4.1.0
+ Platform Version        | e.g. 12.0 / 10.14.0 / 12.0 / 5.0
+ SDWebImage Version      | e.g. 5.0.0 / 4.4.0
  Integration Method      | e.g. carthage / cocoapods / manually
- Xcode Version           | e.g. Xcode 9 / Xcode 8
+ Xcode Version           | e.g. Xcode 11 / Xcode 10
  Repro rate              | e.g. all the time (100%) / sometimes x% / only once
  Repro with our demo prj | e.g. does it happen with our demo project?
  Demo project link       | e.g. link to a demo project that highlights the issue
diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
index aba68f863..cbe7e1615 100644
--- a/.github/PULL_REQUEST_TEMPLATE.md
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -10,7 +10,7 @@
 * [ ] I have run the tests and they pass
 * [ ] I have run the lint and it passes (`pod lib lint`)
 
-This merge request fixes / reffers to the following issues: ...
+This merge request fixes / refers to the following issues: ...
 
 ### Pull Request Description
 
diff --git a/.github/stale.yml b/.github/stale.yml
new file mode 100644
index 000000000..29c8ec38c
--- /dev/null
+++ b/.github/stale.yml
@@ -0,0 +1,28 @@
+# Number of days of inactivity before an issue becomes stale
+daysUntilStale: 60
+# Number of days of inactivity before a stale issue is closed
+daysUntilClose: 7
+# Issues with these labels will never be considered stale
+exemptLabels:
+  - important
+# Label to use when marking an issue as stale
+staleLabel: stale
+# Comment to post when marking an issue as stale. Set to `false` to disable
+markComment: >
+  This issue has been automatically marked as stale because it has not had
+  recent activity. It will be closed if no further activity occurs.
+  If this is still an issue, please make sure it is up to date and if so,
+  add a comment that this is still an issue to keep it open.
+  Thank you for your contributions.
+# Comment to post when closing a stale issue. Set to `false` to disable
+closeComment: false
+
+# Optionally, specify configuration settings that are specific to just 'issues' or 'pulls':
+pulls:
+  daysUntilStale: 60
+  markComment: >
+    This pull request has been automatically marked as stale because it has not had
+     recent activity. It will be closed if no further activity occurs.
+     If this is still applicable, please make sure it is up to date and if so,
+     add a comment that this is still an issue to keep it open.
+     Thank you for your contributions.
diff --git a/.github/workflows/CD.yml b/.github/workflows/CD.yml
new file mode 100644
index 000000000..2749fff14
--- /dev/null
+++ b/.github/workflows/CD.yml
@@ -0,0 +1,59 @@
+name: "SDWebImage CD"
+
+on:
+  push:
+    # Pattern matched against refs/tags
+    tags:        
+      - '*'
+
+jobs:
+  Release:
+    name: Release XCFramework
+    runs-on: macos-15
+    env:
+      LC_ALL: en_US.UTF-8
+      CODESIGN_KEY_BASE64: "${{ secrets.CODESIGN_KEY_BASE64 }}"
+      DEVELOPER_DIR: /Applications/Xcode_16.3.app
+      XCODE_VERSION_MAJOR: 1600
+      XCODE_VERSION_MINOR: 1600
+    strategy:
+      fail-fast: true
+      matrix:
+        linkage: [dynamic, static]
+        include:
+          - linkage: dynamic
+            MACH_O_TYPE: mh_dylib
+          - linkage: static
+            MACH_O_TYPE: staticlib
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Build XCFramework
+        run: |
+          set -o pipefail
+          export MACH_O_TYPE="${{ matrix.MACH_O_TYPE }}"
+          ./Scripts/build-frameworks.sh
+          rm -rf ~/Library/Developer/Xcode/DerivedData/
+
+      - name: Create XCFramework
+        run: |
+          set -o pipefail
+          export MACH_O_TYPE="${{ matrix.MACH_O_TYPE }}"
+          ./Scripts/create-xcframework.sh
+          ./Scripts/sign-xcframework.sh
+
+      - name: Archive XCFramework
+        run: |
+          cd build
+          zip -r -y SDWebImage-${{ matrix.linkage }}.xcframework.zip SDWebImage.xcframework
+          cd ../
+          mv build/SDWebImage-${{ matrix.linkage }}.xcframework.zip SDWebImage-${{ matrix.linkage }}.xcframework.zip
+          rm -rf build
+
+      - uses: softprops/action-gh-release@v0.1.15
+        env:
+          GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+          GITHUB_REPOSITORY: "${{ github.repository }}"
+        with:
+          files: "SDWebImage-${{ matrix.linkage }}.xcframework.zip"
diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
new file mode 100644
index 000000000..b898f73a4
--- /dev/null
+++ b/.github/workflows/CI.yml
@@ -0,0 +1,196 @@
+name: "SDWebImage CI"
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - '*'
+
+permissions:
+  contents: read
+
+jobs:
+  Lint:
+    name: Cocoapods Lint
+    runs-on: macos-15
+    env:
+      LC_ALL: en_US.UTF-8
+      DEVELOPER_DIR: /Applications/Xcode_16.3.app
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Install Cocoapods
+        run: gem install cocoapods --no-document --quiet
+        
+      - name: Install Xcpretty
+        run: gem install xcpretty --no-document --quiet
+        
+      - name: Pod Update
+        run: pod repo update --silent
+        
+      - name: Pod Install
+        run: pod install
+
+      - name: Run SDWebImage podspec lint
+        run: |
+          set -o pipefail
+          pod lib lint SDWebImage.podspec --allow-warnings --skip-tests
+          
+  Demo:
+    name: Cocoapods Demo
+    runs-on: macos-15
+    env:
+      LC_ALL: en_US.UTF-8
+      DEVELOPER_DIR: /Applications/Xcode_16.3.app
+      WORKSPACE_NAME: SDWebImage.xcworkspace
+      CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+      iosDestination: generic/platform=iOS Simulator
+      macOSDestination: platform=macOS,arch=x86_64
+      macCatalystDestination: platform=macOS,arch=x86_64,variant=Mac Catalyst
+      tvOSDestination: generic/platform=tvOS Simulator
+      watchOSDestination: generic/platform=watchOS Simulator
+      visionOSDestination: generic/platform=visionOS Simulator
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Install Cocoapods
+        run: gem install cocoapods --no-document --quiet
+        
+      - name: Install Xcpretty
+        run: gem install xcpretty --no-document --quiet
+        
+      - name: Pod Update
+        run: pod repo update --silent
+        
+      - name: Pod Install
+        run: pod install
+
+      - name: Run demo for OSX
+        run: |
+          set -o pipefail
+          xcodebuild build -workspace "${{ env.WORKSPACE_NAME }}" -scheme "SDWebImage OSX Demo" -destination "${{ env.macOSDestination }}" -configuration Debug CODE_SIGNING_ALLOWED=NO | xcpretty -c
+          
+      - name: Run demo for iOS
+        run: |
+          set -o pipefail
+          xcodebuild build -workspace "${{ env.WORKSPACE_NAME }}" -scheme "SDWebImage iOS Demo" -destination "${{ env.iosDestination }}" -configuration Debug CODE_SIGNING_ALLOWED=NO | xcpretty -c
+          
+      - name: Run demo for TV
+        run: |
+          set -o pipefail
+          xcodebuild build -workspace "${{ env.WORKSPACE_NAME }}" -scheme "SDWebImage TV Demo" -destination "${{ env.tvOSDestination }}" -configuration Debug CODE_SIGNING_ALLOWED=NO | xcpretty -c
+          
+      - name: Run demo for Watch
+        run: |
+          set -o pipefail
+          xcodebuild build -workspace "${{ env.WORKSPACE_NAME }}" -scheme "SDWebImage Watch Demo" -destination "${{ env.watchOSDestination }}" -configuration Debug CODE_SIGNING_ALLOWED=NO | xcpretty -c
+
+      - name: Run demo for Vision
+        run: |
+          set -o pipefail
+          xcodebuild build -workspace "${{ env.WORKSPACE_NAME }}" -scheme "SDWebImage Vision Demo" -destination "${{ env.visionOSDestination }}" -configuration Debug CODE_SIGNING_ALLOWED=NO | xcpretty -c
+
+  Test:
+    name: Unit Test
+    runs-on: macos-15
+    env:
+      LC_ALL: en_US.UTF-8
+      DEVELOPER_DIR: /Applications/Xcode_16.3.app
+      WORKSPACE_NAME: SDWebImage.xcworkspace
+      CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+    # use matrix to generate jobs for each platform
+    strategy:
+      fail-fast: false
+      matrix:
+        platform: [iOS, macOS, tvOS, visionOS]
+        include:
+          - platform: iOS
+            destination: platform=iOS Simulator,name=iPhone 16 Pro Max
+            scheme: iOS
+            flag: ios
+          - platform: macOS
+            destination: platform=macOS,arch=x86_64
+            scheme: Mac
+            flag: macos
+          - platform: tvOS
+            destination: platform=tvOS Simulator,name=Apple TV 4K (3rd generation)
+            scheme: TV
+            flag: tvos
+          - platform: visionOS
+            destination: platform=visionOS Simulator,name=Apple Vision Pro,OS=2.4
+            scheme: Vision
+            flag: visionos
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Install Cocoapods
+        run: gem install cocoapods --no-document --quiet
+        
+      - name: Install Xcpretty
+        run: gem install xcpretty --no-document --quiet
+        
+      - name: Pod Update
+        run: pod repo update --silent
+        
+      - name: Pod Install
+        run: pod install
+
+      - name: Clean DerivedData
+        run: |
+          rm -rf ~/Library/Developer/Xcode/DerivedData/
+          mkdir DerivedData
+        
+      - name: Run test
+        run: |
+          set -o pipefail
+          xcodebuild build-for-testing -workspace "${{ env.WORKSPACE_NAME }}" -scheme "Tests ${{ matrix.scheme }}" -destination "${{ matrix.destination }}" -configuration Debug CODE_SIGNING_ALLOWED=NO | xcpretty -c
+          xcodebuild test-without-building -workspace "${{ env.WORKSPACE_NAME }}" -scheme "Tests ${{ matrix.scheme }}" -destination "${{ matrix.destination }}" -configuration Debug CODE_SIGNING_ALLOWED=NO
+          mv ~/Library/Developer/Xcode/DerivedData/ "./DerivedData/${{ matrix.platform }}"
+          
+      - name: Code Coverage
+        run: |
+          set -o pipefail
+          export PATH="/usr/local/opt/curl/bin:$PATH"
+          curl --version
+          bash <(curl -s https://codecov.io/bash) -v -D "./DerivedData/${{ matrix.platform }}" -J '^SDWebImage$' -c -X gcov -F "${{ matrix.flag }}"
+          
+  Build:
+    name: Build Library
+    runs-on: macos-15
+    env:
+      LC_ALL: en_US.UTF-8
+      DEVELOPER_DIR: /Applications/Xcode_16.3.app
+      PROJECT_NAME: SDWebImage.xcodeproj
+      SCHEME_NAME: SDWebImage
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Build the SwiftPM
+        run: |
+          set -o pipefail
+          swift build
+          rm -rf ~/.build
+          
+      - name: Build as static library
+        run: |
+          set -o pipefail
+          xcodebuild build -project "${{ env.PROJECT_NAME }}" -scheme "SDWebImage static" -sdk iphonesimulator PLATFORM_NAME=iphonesimulator -configuration Debug | xcpretty -c
+          rm -rf ~/Library/Developer/Xcode/DerivedData/
+      - name: Build as dynamic frameworks
+        run: |
+          set -o pipefail
+          xcodebuild build -project "${{ env.PROJECT_NAME }}" -scheme "${{ env.SCHEME_NAME }}" -sdk macosx -configuration Debug | xcpretty -c
+          xcodebuild build -project "${{ env.PROJECT_NAME }}" -scheme "${{ env.SCHEME_NAME }}" -sdk iphonesimulator PLATFORM_NAME=iphonesimulator -configuration Debug | xcpretty -c
+          xcodebuild build -project "${{ env.PROJECT_NAME }}" -scheme "${{ env.SCHEME_NAME }}" -sdk appletvsimulator -configuration Debug | xcpretty -c
+          xcodebuild build -project "${{ env.PROJECT_NAME }}" -scheme "${{ env.SCHEME_NAME }}" -sdk watchsimulator -configuration Debug | xcpretty -c
+          xcodebuild build -project "${{ env.PROJECT_NAME }}" -scheme "${{ env.SCHEME_NAME }}" -destination "platform=macOS,arch=x86_64,variant=Mac Catalyst" -configuration Debug | xcpretty -c
+          xcodebuild build -project "${{ env.PROJECT_NAME }}" -scheme "${{ env.SCHEME_NAME }}" -sdk xrsimulator -configuration Debug | xcpretty -c
+          rm -rf ~/Library/Developer/Xcode/DerivedData/
diff --git a/.gitignore b/.gitignore
index 5888fc63a..21074f2ee 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
+# OS X
+.DS_Store
 # Xcode
 #
 build/
@@ -28,3 +30,6 @@ DerivedData
 #
 Pods/
 Podfile.lock
+
+# SwiftPM
+.build
\ No newline at end of file
diff --git a/.gitmodules b/.gitmodules
deleted file mode 100644
index d8c3ae836..000000000
--- a/.gitmodules
+++ /dev/null
@@ -1,6 +0,0 @@
-[submodule "Vendors/libwebp"]
-	path = Vendors/libwebp
-	url = https://github.com/webmproject/libwebp
-[submodule "Vendors/FLAnimatedImage"]
-	path = Vendors/FLAnimatedImage
-	url = https://github.com/Flipboard/FLAnimatedImage
diff --git a/.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata b/.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
new file mode 100644
index 000000000..919434a62
--- /dev/null
+++ b/.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 3c2ab23c3..000000000
--- a/.travis.yml
+++ /dev/null
@@ -1,54 +0,0 @@
-
-language: objective-c
-osx_image: xcode9
-
-env:
-  global:
-    - LC_CTYPE=en_US.UTF-8
-    - LANG=en_US.UTF-8
-
-notifications:
-  email: false
-
-before_install:
-    - env
-    - locale
-    - gem install cocoapods --no-rdoc --no-ri --no-document --quiet
-    - gem install xcpretty --no-rdoc --no-ri --no-document --quiet
-    - pod --version
-    - pod setup --silent > /dev/null
-    - pod repo update --silent
-    - xcpretty --version
-    - xcodebuild -version
-    - xcodebuild -showsdks
-
-script:
-    - set -o pipefail
-
-    - echo Check if the library described by the podspec can be built
-    - pod lib lint --allow-warnings
-
-    - echo Build as static library
-    - xcodebuild clean build -workspace SDWebImage.xcworkspace -scheme 'SDWebImage iOS static' -sdk iphonesimulator PLATFORM_NAME=iphonesimulator -configuration Debug | xcpretty -c
-    - xcodebuild clean build -workspace SDWebImage.xcworkspace -scheme 'SDWebImage watchOS static' -sdk watchsimulator -configuration Debug | xcpretty -c
-
-    - echo Build as dynamic framework
-    - xcodebuild clean build -workspace SDWebImage.xcworkspace -scheme 'SDWebImage OSX' -sdk macosx -configuration Debug | xcpretty -c
-    - xcodebuild clean build -workspace SDWebImage.xcworkspace -scheme 'SDWebImage iOS' -sdk iphonesimulator PLATFORM_NAME=iphonesimulator -configuration Debug | xcpretty -c
-    - xcodebuild clean build -workspace SDWebImage.xcworkspace -scheme 'SDWebImage tvOS' -sdk appletvsimulator -configuration Debug | xcpretty -c
-    - xcodebuild clean build -workspace SDWebImage.xcworkspace -scheme 'SDWebImage watchOS' -sdk watchsimulator -configuration Debug | xcpretty -c
-
-    - echo Build the Demo apps
-    - xcodebuild build -workspace SDWebImage.xcworkspace -scheme 'SDWebImage OSX Demo' -sdk macosx -configuration Debug | xcpretty -c
-    - xcodebuild build -workspace SDWebImage.xcworkspace -scheme 'SDWebImage iOS Demo' -configuration Debug -destination 'name=iPhone 6s' | xcpretty -c
-    - xcodebuild build -workspace SDWebImage.xcworkspace -scheme 'SDWebImage TV Demo' -sdk appletvsimulator -configuration Debug | xcpretty -c
-    - xcodebuild build -workspace SDWebImage.xcworkspace -scheme 'SDWebImage Watch Demo' -configuration Debug -destination 'name=iPhone 6s' | xcpretty -c
-
-    - echo Run the tests
-    - pod install --project-directory=Tests
-    - xcodebuild clean -workspace SDWebImage.xcworkspace -scheme 'SDWebImage iOS' -sdk iphonesimulator PLATFORM_NAME=iphonesimulator -configuration Debug | xcpretty -c
-    - xcodebuild clean -workspace SDWebImage.xcworkspace -scheme 'SDWebImage iOS Demo' -configuration Debug -destination 'name=iPhone 6s' | xcpretty -c
-    - xcodebuild test -workspace SDWebImage.xcworkspace -scheme 'Tests' -sdk iphonesimulator -destination 'platform=iOS Simulator,name=iPhone 6,OS=latest' -configuration Debug | xcpretty -c
-
-after_success:
-    - bash <(curl -s https://codecov.io/bash)
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7a82f75f7..d374ef986 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,1442 @@
-## [4.4.2 - 4.4 patch, on July 18th, 2018](https://github.com/rs/SDWebImage/releases/tag/4.4.2)
-See [all tickets marked for the 4.4.2 release](https://github.com/rs/SDWebImage/milestone/27)
+## [5.21.7 - 5.21 Patch on Feb 26th 2026]
+See [all tickets marked for the 5.21.7 release](https://github.com/SDWebImage/SDWebImage/milestone/149)
+
+### Fixes
+- Fix AppKit SDImageCoderHelper does not use APNG instead of GIF for animated image creation #3870 #3871 @ijunfly
+
+## [5.21.6 - 5.21 Patch on Feb 6th 2026]
+See [all tickets marked for the 5.21.6 release](https://github.com/SDWebImage/SDWebImage/milestone/148)
+
+### Fixes
+- Fix the issue that thumbnail decoding will store the fulll image data into thumbnail key, which effect next time query from disk #3866
+
+### Changes
+- Image cache query API for disk type, no longer write back image to memory cache automatically. Call `storeImageToMemory` if you need.
+- Added support to encode APNG instead of GIF, when no animated image format provided #3867
+
+## [5.21.5 - 5.21 Patch on Dec 3rd 2025]
+See [all tickets marked for the 5.21.5 release](https://github.com/SDWebImage/SDWebImage/milestone/147)
+
+### Fixes
+- Try to move the SDWebImageDownloaderOperation dataTask property initialization into synchronized lock to avoid thread-safe issue #3856 #3842
+
+## [5.21.4 - 5.21 Patch on Nov 28th 2025]
+See [all tickets marked for the 5.21.4 release](https://github.com/SDWebImage/SDWebImage/milestone/146)
+
+### Fixes
+- Using @synchronized to always lock the cache/loader operation to ensure thread-safe. Fix crash issue on iOS 26 #3855 #3849
+
+## [5.21.3 - 5.21 Patch on Sep 9th 2025]
+See [all tickets marked for the 5.21.3 release](https://github.com/SDWebImage/SDWebImage/milestone/145)
+
+### Fixes
+- Switched image encoding to a context-aware approach with a safe fallback, allowing per-request encoder selection without changing the public API. #3844 @CloudlessMoon
+
+## [5.21.2 - 5.21 Patch on Aug 29th 2025]
+See [all tickets marked for the 5.21.2 release](https://github.com/SDWebImage/SDWebImage/milestone/144)
+
+### Fixes
+- Do not ignore blendMode in SDImageTintTransformer #3831 @bdaz 
+- Fix the retryFailed option does not get modified by optionsProcessor #3829 @AirBlack
+- Avoid self if be nil in block. #3826 @hawk0620
+
+## [5.21.1 - Xcode 26 Compatible on Jun 10th, 2025]
+See [all tickets marked for the 5.21.1 release](https://github.com/SDWebImage/SDWebImage/milestone/143)
+
+### Projects
+- [Xcode 26] - Fix watchOS build error with UITraitCollection in the new SDK #3819
+
+### Performance
+- Reduce memory peak when playing the GIF on SDAnimatedImageView #3813
+
+## [5.21.0 - HDR Support on Feb 24th, 2025]
+See [all tickets marked for the 5.21.0 release](https://github.com/SDWebImage/SDWebImage/milestone/142)
+
+### Features
+#### HDR Decoding
+- Supports HDR decoding on Apple ImageIO coder (avif/heic/jpeg-xl, etc) #3778
+- - Note: Defaults to always use SDR, if you want HDR decoding, pass `SDWebImageContextDecodeToHDR: @(YES)` to context option. Pay attention even decoded CGImage is HDR ready, full rendering require display hardware support and per-image-view level control, it's recommended to read [WWDC23](https://developer.apple.com/videos/play/wwdc2023/10181/) and use proper API to check for current display headroom to turn on HDR.
+- - Note: Apple ImageIO coder requires macOS 14/iOS 17+ for HDR decoding. For lower firmware you can consider AVIF/HEIF/JPEG-XL [third-party codec](https://github.com/SDWebImage/SDWebImage/wiki/Coder-Plugin-List)
+
+#### HDR Encoding
+- Supports HDR encoding on Apple ImageIO coder #3799
+- - Note: Defaults to always use SDR, if you want HDR dencoding, pass `SDImageCoderEncodeToHDR: @(SDImageHDRTypeISOHDR)` for ISO HDR encoding. And `SDImageHDRTypeISOGainMap` for ISO Gain Map based HDR encoding (like JPEG for compatibility)
+- - Note: Apple ImageIO coder requires macOS 15/iOS 18+ for HDR encoding. For lower firmware you can consider AVIF/HEIF/JPEG-XL [third-party codec](https://github.com/SDWebImage/SDWebImage/wiki/Coder-Plugin-List)
+
+### Transformer
+- Allows user to directly customize preserveImageMetadata for our built-in transformers #3796
+
+### UI Category
+- Change the default callback queue policy to SafeAsyncMainThread, don't need main queue check at all #3797
+- - Note: This should make `sd_setImageWithURL` related UI API to work on case like `UICollectionViewDiffableDataSource` , which is running on main thread but not main queue.
+
+### Fixes
+- fix: sd_colorAtPoint/sd_colorsWithRect should early return when pixel format is not supported #3798
+- - Note: In history this may return a wrong color for RGB10/RGB16 pixel format. Now it just return nil, which may supported in the future.
+
+## [5.20.1 - 5.20 Patch on Feb 20th, 2025]
+See [all tickets marked for the 5.20.1 release](https://github.com/SDWebImage/SDWebImage/milestone/141)
+
+### Fixes
+- (macOS) Fix SDAnimatedImagePlayer leaking SDDisplayLink instances and leaving CVDisplayLink threads running #3776
+- (macOS) Add autoreleasepool to DisplayLinkCallback to release objects #3779
+- Fix the issue that previous optimization for special case (multiple same URL in prefetcher list) breaks the queryCacheType option sematic #3788
+
+## [5.20.0 - Animation Transformer with tint color, on Nov 1st, 2024](https://github.com/rs/SDWebImage/releases/tag/5.20.0)
+See [all tickets marked for the 5.20.0 release](https://github.com/SDWebImage/SDWebImage/milestone/139)
+
+### Features
+#### Animation Transformer
+- SDAniamtedImageView now supports to apply transformer (post-processing of frame), with the SDAnimatedImage. #3761
+- You can apply transform like blurs, tint, CIFilters on animation frames.
+- - Detailed behavior: Transform is applied just after the frame been decoded, on the global decode queue.
+- - Detailed behavior: The transformed image replace the original decoded one, and re-use the design of `maxBufferSize` on SDAnimatedImageView
+
+#### Disk Cache
+- Supports LRU eviction on disk cache, change the default expire type to accessDate instead of modificationDate #3759
+- - In previous versions, the disk cache does not actually supports LRU (The NSFileManager read API does not update the `accessDate`), this version fix this issue and change the default behavior to use `accessDate`
+
+#### Tint Color
+- Add blend mode to UIImage+Transform tint color API, default blend mode changed to sourceIn #3749
+- - In previous versions, the blend mode use `sourceAtop` and does not match UIKit's `tintColor` naming. We now use `sourceIn` to match it.
+- - Due to this changes, the `SDWebImageTintTransformer` defaults to use `sourceIn` blend mode as well. You can use transformer to tint SDAnimatedImageView as well
+
+### Fixes
+- Fix sd_imageFormat sometimes returns undefined on static image #3760
+
+## [5.19.7 - 5.19 fix, on Sep 22th, 2024](https://github.com/rs/SDWebImage/releases/tag/5.19.7)
+See [all tickets marked for the 5.19.7 release](https://github.com/SDWebImage/SDWebImage/milestone/139)
+
+### Fixes
+- Fix the thumbnail decoding on JPEG which contains EXIF orientation, use the new way to workaround JFIF bug #3743
+- Fix the crash when some special urls cause the cache path return nil and crash #3740
+- Fix the issue that some URL which has percent-encoding with \0 will cause nil cache path #3744
+
+## [5.19.6 - Thumbnail performance, on Sep 7th, 2024](https://github.com/rs/SDWebImage/releases/tag/5.19.6)
+See [all tickets marked for the 5.19.5 release](https://github.com/SDWebImage/SDWebImage/milestone/138)
+
+### Performance
+- Use the better way to detect lazy/non-lazy CGImage. Only do force decoding for lazy image (avoid thumbnail image been decoded twice) #3736
+
+### Fixes
+- Remove the unused code for iOS 10 polyfill #3735
+
+## [5.19.5 - Swift 6 Compatible, on Jul 24th, 2024](https://github.com/rs/SDWebImage/releases/tag/5.19.5)
+See [all tickets marked for the 5.19.5 release](https://github.com/SDWebImage/SDWebImage/milestone/137)
+
+### Fixes
+- Fix our HEIC coder to encode timed image sequences instead of non-timed image gallery for HEIC encoding #3727
+- - If you have use case to encode static multi-frame HEIC image, use ImageIO directly. SDWebImage currenly always assume multi-frame image to be animated.
+
+### Project
+- Use the new macro from Swift compiler and SDK to mark the UIImage/UIImageView subclass matching what they designed to be #3731
+- - This solve the Xcode 16 Beta issue when trun on Swift 6 mode with strict concurrency.
+
+### Tests
+- Try to re-enable the HEIC encoding test and visionOS xctest #3728
+
+## [5.19.4 - 5.19 Patch, on Jul 1st, 2024](https://github.com/rs/SDWebImage/releases/tag/5.19.4)
+See [all tickets marked for the 5.19.4 release](https://github.com/SDWebImage/SDWebImage/milestone/136)
+
+### Fixes
+- Fix the issue that SDAnimatedImage breaks the vector on macOS #3724
+
+## [5.19.3 - 5.19 Patch, on May 30th, 2024](https://github.com/rs/SDWebImage/releases/tag/5.19.3)
+See [all tickets marked for the 5.19.3 release](https://github.com/SDWebImage/SDWebImage/milestone/135)
+
+### Fixes
+- Fix the detection of SVGImageRep on macOS AppKit #3716
+
+## [5.19.2 - Canonical Binary XCFramework, on Mar 26th, 2024](https://github.com/rs/SDWebImage/releases/tag/5.19.2)
+See [all tickets marked for the 5.19.2 release](https://github.com/SDWebImage/SDWebImage/milestone/134)
+
+### Fixes
+- Fix some regression when SDAnimatedImage created with static format like JPEG #3708
+- Fix that colorSpaceGetDeviceRGB cache the color space even when active display changed #3712
+
+### Project
+- Added GitHub action to release XCFramework which is self-signed #3711 #3709
+- - This is the canonical release of binary framework. Import [certifacate](https://github.com/SDWebImage/SDWebImage/blob/master/Certificate/SDWebImage%20Signing%20Certificate.cer) and verify the [public key](https://github.com/SDWebImage/SDWebImage/blob/master/Certificate/SDWebImage%20Signing%20Certificate.pem) when you download the binary framework from unknown sources to avoid supply chain attack.
+- - For Carthage user who build its own SDWebImage binary framwork, you must sign yourself.
+- - See more in https://developer.apple.com/documentation/Xcode/verifying-the-origin-of-your-xcframeworks
+- Fix CocoaPods resource bundle when using only `SDWebImage/Core`
+
+## [5.19.1 - 5.9 Patch, on Mar 26th, 2024](https://github.com/rs/SDWebImage/releases/tag/5.19.1)
+See [all tickets marked for the 5.19.1 release](https://github.com/SDWebImage/SDWebImage/milestone/133)
+
+### Features
+- Allows the transformer to preserve the UIImage metadata like image format #3688
+- Add a protect when NSString passed into sd_setImageWithURL API (which should be NSURL instance) #3686
+
+### Performance
+- Replace NSFileManager.enumeratorAtPath with enumeratorAtURL for performance and RAM saving #3690
+
+### Warnings
+- mark SDWebImageCacheKeyFilter default initializer unavailable & add missing default case of SDCallbackQueue sync/async function #3683
+
+## [5.19 - CocoaPods X VisionOS, on Feb 25th, 2024](https://github.com/rs/SDWebImage/releases/tag/5.19.0)
+See [all tickets marked for the 5.19.0 release](https://github.com/SDWebImage/SDWebImage/milestone/123)
+
+### Project
+- [Part 2]Added the official visionOS support with CocoaPods, include Demo/Tests/CI #3673
+- This need CocoaPods 1.13.0+
+- Next: We'll bump other SDWebImage.org Pods, like `SDWebImageSwiftUI`, `SDWebImageWebPCoder`, `libwebp` on CocoaPods with the visionOS podspec support.
+
+### Features
+- Added SDWebImageWaitTransition to wait for transition finished and then callback completedBlock #3680
+
+### Changes
+- Formally deprecate `sd_cancelCurrentImageLoad` on UIView category, which cause misunderstanding for the same overloaded method in UIImageView category #3654
+
+## [5.18.12 - 5.8 Patch, on Feb 24th, 2024](https://github.com/rs/SDWebImage/releases/tag/5.18.12)
+See [all tickets marked for the 5.18.12 release](https://github.com/SDWebImage/SDWebImage/milestone/132)
+
+### Fixes
+
+- Fix the issue that iOS 17 indexed PNG workaround breaks the 16bit RGBA PNG #3678
+
+## [5.18.11 - 5.8 Patch, on Feb 13th, 2024](https://github.com/rs/SDWebImage/releases/tag/5.18.11)
+See [all tickets marked for the 5.18.11 release](https://github.com/SDWebImage/SDWebImage/milestone/131)
+
+### Fixes
+
+- Add missing break keyword while converting NSData to SDImageFormat #3672 @adamwangxx
+
+## [5.18.10 - 5.8 Patch, on Jan 11th, 2024](https://github.com/rs/SDWebImage/releases/tag/5.18.10)
+See [all tickets marked for the 5.18.10 release](https://github.com/SDWebImage/SDWebImage/milestone/130)
+
+### Warning
+
+- Fix the warning during clang-analyze #3664 #3663
+
+## [5.18.9 - 5.8 Bugfix, on Jan 10th, 2024](https://github.com/rs/SDWebImage/releases/tag/5.18.9)
+See [all tickets marked for the 5.18.9 release](https://github.com/SDWebImage/SDWebImage/milestone/129)
+
+### Fixes
+
+- Fix that PNG indexed color fix does not enable on Release Build configuration #3659 #3658
+- - The fix was introduced in 5.18.5, but accidentally only enabled in Debug configuration :)
+- Fix the behavior that query thumbnail from full size data does not sync back the thumbnail image into memory cache #3657 #3656
+- - The bug was introduced in 5.14.0, please upgrade if you use thumbnail decoding.
+- Temp remove the assert when thumbnail cache key used with thumbnail context , this may be changed later #3661
+
+### Project
+- Using os_log for our all log to replace the NSLog #3660
+
+## [5.18.8 - 5.8 Patch, on Dec 27th, 2023](https://github.com/rs/SDWebImage/releases/tag/5.18.8)
+See [all tickets marked for the 5.18.8 release](https://github.com/SDWebImage/SDWebImage/milestone/128)
+
+### Fixes
+- Fix the issue when using the sd_cancelCurrentImageLoad on non-stateful view (like UIImageView.image) #3653
+
+## [5.18.7 - CocoaPods Privacy Manifest, on Dec 11th, 2023](https://github.com/rs/SDWebImage/releases/tag/5.18.7)
+See [all tickets marked for the 5.18.7 release](https://github.com/SDWebImage/SDWebImage/milestone/127)
+
+### Project
+- Added xcprivacy manifest to CocoaPods #3649
+- - Now all the 3 integration supports the privacy manifest. Check README about usage.
+
+## [5.18.6 - ProMotion/Vision Fix, on Dec 5th, 2023](https://github.com/rs/SDWebImage/releases/tag/5.18.6)
+See [all tickets marked for the 5.18.6 release](https://github.com/SDWebImage/SDWebImage/milestone/126)
+
+### Fixes
+- Use the new solution for CADisplayLink duration calculation and fix 90Hz/120Hz display (iPhone Pro or Vision Pro) #3644 #3579
+
+## [5.18.5 - iOS 17 Workaround, on Nov 16th, 2023](https://github.com/rs/SDWebImage/releases/tag/5.18.5)
+See [all tickets marked for the 5.18.5 release](https://github.com/SDWebImage/SDWebImage/milestone/125)
+
+### Fixes
+- Introduce the hacky workaround for iOS 17/macOS 14 ImageIO indexed color png decode (Apple's bug) #3634
+- - This will use runtime detection (accurate and safe), and fix the wrong CGImageAlphaInfo when created from PNG using ImageIO decoder. Currently bug exists on iOS 17.0-17.2
+- - Please help to fire radar to Apple, let them fix this problem as soon as possible.
+- Fix the iOS 17 UIKit issue that UIImageView entering the background will reset CALayer's contents, which cause SDAnimatedImageView render issue (out-of-sync) #3636
+- Fix the sd_colorAtPoint/sd_colorsWithRect return wrong value on pre-multiplied CGImage #3637
+- - Previous version this may return the premultiplied color, which is wrong. Should always return the un-premultiplied color.
+
+### Tests
+- [Unit test] Use placehold.co to replace the down site via.placeholder.com #3639
+
+
+## [5.18.4 - 5.18 Fix, on Oct 27th, 2023](https://github.com/rs/SDWebImage/releases/tag/5.18.4)
+See [all tickets marked for the 5.18.4 release](https://github.com/SDWebImage/SDWebImage/milestone/124)
+
+### Changes
+- SDAnimatedImage now supports static image like JPEG data #3626 #3625
+-  - Previous version the initializer will return nil and has to use UIImage/NSImage instead
+
+## [5.18.3 - 5.18 Fix, on Oct 10th, 2023](https://github.com/rs/SDWebImage/releases/tag/5.18.3)
+See [all tickets marked for the 5.18.3 release](https://github.com/SDWebImage/SDWebImage/milestone/122)
+
+### Project
+- Update the TargetConditionals check for visionOS on Xcode 15.1 #3620
+
+### Fixes
+- Update the convenient API for case when user encode the format the same as image format, provide better quick return #3617
+- Try to remove the unused NSNotification object filter, do filter by ourself #3619
+
+## [5.18.2 - 5.18 Fix, on Sep 21st, 2023](https://github.com/rs/SDWebImage/releases/tag/5.18.2)
+See [all tickets marked for the 5.18.2 release](https://github.com/SDWebImage/SDWebImage/milestone/121)
+
+### Fixes
+- Fix the SDDisplayLink on watchOS does not behave like other platform #3607
+
+## [5.18.1 - Privacy Manifest, on Sep 12th, 2023](https://github.com/rs/SDWebImage/releases/tag/5.18.1)
+See [all tickets marked for the 5.18.1 release](https://github.com/SDWebImage/SDWebImage/milestone/120)
+
+### Project
+- Added the visionOS support for "Build XCFramework" script target #3598
+- Added xcprivacy to framework target and SPM #3600
+
+### Fixes
+- Fix the JFIF image orientation bug (which does not use EXIF but JFIF metadata) #3597
+
+### Warnings
+- Fix one warning because local variable shadows the variable outside of block #3599
+
+## [5.18.0 - VisionOS and more, on Sep 2nd, 2023](https://github.com/rs/SDWebImage/releases/tag/5.18.0)
+See [all tickets marked for the 5.18.0 release](https://github.com/SDWebImage/SDWebImage/milestone/119)
+
+### VisionOS
+- Support to build for visionOS (no package manager support) #3556
+- - Note this does not include CocoaPods/SwiftPM support. You need Xcode 15+ Beta to open SDWebImage project and build by yourself
+
+### Features
+#### UI Category
+- Added SDWebImageAvoidAutoCancelImage to avoid cancel loading image requests for the same operation key #3592 @mTz0206 
+- Add better support for stateful view (UIButton) for image URL/progres s state management #3576
+
+#### Downloader
+- Fix redundant requests for the same url during decoding time #3572 @Mervin1024
+
+#### Decoder
+- Expose the data and format when SDAnimatedImageRep created with APNG/GIF/WebP/HEICS #3573
+- Fix the CGImageCreateScaled to support 16/32 bit depth CGImage (RGB161616) and always preserve pixel format info #3575
+
+### Fixes
+- Add extra check for empty data during URLSession data callback #3587
+
+## [5.17.0 - Reduce RAM with Force Decode, on Jul 13th, 2023](https://github.com/rs/SDWebImage/releases/tag/5.17.0)
+See [all tickets marked for the 5.17.0 release](https://github.com/SDWebImage/SDWebImage/milestone/118)
+
+### Performance
+- Refactory the logic to handle force decode logic to avoid CA copy frame buffer, introduce SDImageForceDecodePolicy detailed control #3559 #3417
+- - This fix the issue that non-ImageIO coder (means, WebPCoder) will cause CA to copy bitmap buffers and increase memory usage.
+- - You can still custom the behavior using the new `SDImageForceDecodePolicy`, defaults to automatic.
+- For coder plugin who want to opt-in to avoid `CA::copy_image`, use the new `preferredPixelFormat:` and to do bytes alignment and colorspace convert.
+
+### Fixes
+- Fix macOS bug that SDImageCoderDecodeScaleDownLimitBytes still use the AnimatedImageRep and beyond the byte limit #3561
+- Change macOS `sd_colorAtPoint/sd_colorsWithRect` which may loss colorspace information. Now it correctly convert to sRGB colorspace always.
+
+## [5.16.0 - Limit Bytes && Frame Pool, on Jun 4th, 2023](https://github.com/rs/SDWebImage/releases/tag/5.16.0)
+See [all tickets marked for the 5.16.0 release](https://github.com/SDWebImage/SDWebImage/milestone/116)
+
+### Features
+#### Animated Image
+- Performance: Introduce frame pool for SDAnimatedImage playback. Solve when multiple image view references the same URL image cause un-wanted decode which waste RAM/CPU #3524
+- - Note this currently does not expose the frame pool API. Fire issue if  you're facing issues about this change.
+
+#### Decoder
+- Introduce the automatically calculation of thumbnail (include animated/static image) using SDImageCoderDecodeScaleDownLimitBytes #3537
+- - This calculation of the UIKit-based animated image frame count as well (only `UIAnimatedImage`, not `SDAnimatedImage`, because `SDAnimatedImage` manage frames dynamically). Fire issue if you're facing issues about this change.
+- - The `.scaleDownLargeImages` implementation has switched to use this instead of `.thumbnailPixelSize` (5.5.0 - 5.16.0)
+- - Note this introduce new API and need Coder Plugin update (like WebP/AVIF)
+
+### Documentations
+- Update some comments to allows SwiftDocC generate better page #3547
+
+## [5.15.8 - Fix macOS Crash, on May 15th, 2023](https://github.com/rs/SDWebImage/releases/tag/5.15.8)
+See [all tickets marked for the 5.15.8 release](https://github.com/SDWebImage/SDWebImage/milestone/117)
+
+### Fixes
+- Try to fix macOS SDDisplayLink crash because of accessing the deallocated objc pointer during CVDisplayLinkRef callback #3531
+
+### Changes
+- Update the implementation SDScaledImageForScaleFactor to support SDAnimatedImage #3535
+
+## [5.15.7 - Fix Crash, on May 6th, 2023](https://github.com/rs/SDWebImage/releases/tag/5.15.7)
+See [all tickets marked for the 5.15.7 release](https://github.com/SDWebImage/SDWebImage/milestone/115)
+
+### Fixes
+- Try to solve the strange dispatch group crash in SDSafeExecute by removing inline #3526
+
+### Performance
+- Opt when multiple same URLs queried in parallel, which may cause duplicated decode and store disk operation #3523
+
+## [5.15.6 - Fix watchOS, on Apr 23rd, 2023](https://github.com/rs/SDWebImage/releases/tag/5.15.6)
+See [all tickets marked for the 5.15.6 release](https://github.com/SDWebImage/SDWebImage/milestone/114)
+
+### Performance
+- Small improvements to SDDiskCache write perf #3517
+- - Note this slightly change the bahavior when you manual grab the `SDImageCache.diskCachePath` and remove it without creating new directory, next disk cache write operation will fail, before the restart of App.
+
+### Fixes
+- Revert the SDDisplayLink for watchOS, fix the animated image duration bug #3520 #3511
+
+### Warnings
+- Fix the warning of C function with no param #3519
+
+## [5.15.5 - Fix, on Mar 3rd, 2023](https://github.com/rs/SDWebImage/releases/tag/5.15.5)
+See [all tickets marked for the 5.15.5 release](https://github.com/SDWebImage/SDWebImage/milestone/113)
+
+### Fixes
+- Protect the disk operation when input key is nil and cause exception #3505 #3504
+- Fix the blur effect logic by avoid color convert and always use three box-blur methodology #3506
+
+## [5.15.4 - Hotfix, on Feb 21st, 2023](https://github.com/rs/SDWebImage/releases/tag/5.15.4)
+See [all tickets marked for the 5.15.4 release](https://github.com/SDWebImage/SDWebImage/milestone/112)
+
+### Fixes
+- Fix the crash because of wrong usage of NS_NOESCAPE for SDCallbackQueue async block, should matching DispatchQueue #3500
+- - This crash only occurs in specified version of clang compiler. But still recommended to update
+
+## [5.15.3 - Promotion Fix, on Feb 18th, 2023](https://github.com/rs/SDWebImage/releases/tag/5.15.3)
+See [all tickets marked for the 5.15.3 release](https://github.com/SDWebImage/SDWebImage/milestone/111)
+
+### Fixes
+- Fix the issue when multiple request for same url failed, the completedBlock will callback more times #3497 #3493
+- Try to fix the SDAnimatedImageView playback speed issue in Promotion devices (iPhone Pro) #3496 #3491
+
+## [5.15.2 - Race Condition Fix, on Feb 7th, 2023](https://github.com/rs/SDWebImage/releases/tag/5.15.2)
+See [all tickets marked for the 5.15.2 release](https://github.com/SDWebImage/SDWebImage/milestone/110)
+
+### Fixes
+- Fix the atomic logic between downloader and operation again #3483
+
+### Warnings
+- Code garden to change Objc bool from true/false to YES/NO #3484
+
+## [5.15.1 - Race Condition Fix, on Feb 6th, 2023](https://github.com/rs/SDWebImage/releases/tag/5.15.1)
+See [all tickets marked for the 5.15.1 release](https://github.com/SDWebImage/SDWebImage/milestone/109)
+
+### Fixes
+- Ensure the Downloader and DownloaderOperation callback the completion in atomic and never miss one #3477
+- - This fix a long-term issue when multiple download request for same URL at the same time, some callbacks will missing. After fix, this will cause a brand new HTTP request but never miss any callbacks.
+- Fix the issue the fallback logic of ImageIO Source should avoid passing any UTI hint #3473
+- Try to fix the SDAsyncBlockOperation's race condition #3479 #3275
+- Avoid compiler generate the wrong property attribute with non-atomic #3474
+
+### Performance
+- Remove the unused extra copy for SDAnimatedImage data initializer #3480
+
+## [5.15.0 - Performance Enhancement, on Jan 17th, 2023](https://github.com/rs/SDWebImage/releases/tag/5.15.0)
+See [all tickets marked for the 5.15.0 release](https://github.com/SDWebImage/SDWebImage/milestone/108)
+
+### Features
+
+#### Encoder
+- Added encodeWithFrames API for animation encoding in custom coder, better for usage #3469
+- - Previously you have to wrap `SDImageFrame` array into temp image object for encoding, this cause wrap/unwrap performance cost (even bad on macOS because it implicit triggers temp GIF encoding). Now you can directly pass it into new `encodedDataWithFrames:` APIs.
+
+#### Decoder
+- Update the decode solution to allows CoreGraphics avoid using any UIKit method #3468
+
+#### Cache
+- Seperate the SDImageCache encode queue and IO queue to match waitStoreCache behavior #3466
+- - Now, the encode process does not block IO queue and query disk cache faster. Previously `SDWebImageWaitStoreCache` is useless when you use transformer or cache serializer. Now you MUST pass this if you want to query disk cache inside completionBlock.
+
+#### Manager/Cache/Loader
+- Added context option callbackQueue and SDCallbackQueue wrapper for advanced user to control which queue to callback #3465 #3457
+- - If you want SDWebImage callback your completion in current non-main queue, pass `.context[.callbackQueue] = .current`
+- Added SDWebImageContextImageEncodeOptions to pass encode options like compression quality to SDImageCache storeImage API #3466
+- - The re-encode and store cache logic happens if you use transformer or custom cache serializer, now you can pass the encode options.
+
+## [5.14.3 - 5.14 Opt, on Dec 27th, 2022](https://github.com/rs/SDWebImage/releases/tag/5.14.3)
+See [all tickets marked for the 5.14.3 release](https://github.com/SDWebImage/SDWebImage/milestone/106)
+
+### Performance
+- Added ioQueueAttributes to use concurrent or control QoS for image cache internal IO Queue #3460
+- When frame timestamp not reached, we should prefetch frame in advance for image render #3452
+
+### Fixes
+- Fix the iOS 15+ force-decode hack break Apple's HEIF and JPEG YUV420 optimization #3461
+- The poster image should not trigger a frameChange callback #3459
+
+## [5.14.2 - 5.14 Fix, on Nov 11th, 2022](https://github.com/rs/SDWebImage/releases/tag/5.14.2)
+See [all tickets marked for the 5.14.2 release](https://github.com/SDWebImage/SDWebImage/milestone/105)
+
+### Fixes
+- Move the `SD_CHECK_CGIMAGE_RETAIN_SOURCE` assertion to SDWebImage Demo and Tests only #3443 #3442 #3441
+
+## [5.14.1 - 5.14 Crash Fix, on Nov 11th, 2022](https://github.com/rs/SDWebImage/releases/tag/5.14.1)
+See [all tickets marked for the 5.14.1 release](https://github.com/SDWebImage/SDWebImage/milestone/104)
+
+### Fixes
+- Fix the iOS 12 crash because the underlyingQueue is nil #3434 #3433
+- Fix the missing lock for callbackTokens which may cause thread-safe issue #3439 #3438
+- Use CoreGraphics to decode PDF instead of ImageIO to solve iOS 16's issue #3436
+
+## [5.14.0 - Meet DecodeOptions, on Nov 8th, 2022](https://github.com/rs/SDWebImage/releases/tag/5.14.0)
+See [all tickets marked for the 5.14.0 release](https://github.com/SDWebImage/SDWebImage/milestone/102)
+
+### Behavior Changes
+- Introduce `SDWebImageContextImageDecodeOptions`, deprecate `SDImageCoderWebImageContext` #3421
+- - Note the deprecated `SDImageCoderWebImageContext` is no longer used. Update your codebase to use `SDWebImageContextImageDecodeOptions` to pass extra information from manager to coder. Loaded image will also store the same information in `image.sd_decodeOptions`
+- Refactor the hack when multiple different thumbnail image requests for same url called at the same time #3423
+- - Now the SDWebImageDownloader can callback each thumbnail request for same url with the correct image size as well (previously can't)
+- - Now if manager's callback image is thumbnail (`image.sd_isThumbnail == YES`), or transformed (`image.sd_isTransformed == YES`), the callback data will be nil. This because the image does not match downloaded data actually. If you really need original full size data, query the disk cache again using the original key. You may need `SDWebImageWaitStoreCache` options as well. (previously behavior is undefined, may callback with full size data, or encoded small size data, or even nil)
+
+### Features
+
+#### Coder
+- Support use url.path or custom UTI hint passed to ImageIO, solve the TIFF/NEF/SRW raw image decoding with wrong size #3419
+- - Note from 5.14.0, we may pass the file extension to coder as a UTI hint
+- Added `SDImageCoderDecodeUseLazyDecoding` to control whether to use lazy-decoding for ImageIO #3425
+- - Note from 5.14.0, by default we enable lazy decoding for static image coder, disable lazy decoding for animated image coder, suitable for most cases. If you want, pass `.decodeUseLazyDecoding = YES` to context option `.imageDecodeOptions`
+
+### Performance
+- Introduce new workaround to strip CGImage retained CGImageSource on iOS 15 #3425 #3387
+- - Note this also fix the limitation that you can not use lazy-decoding for animated image on iOS 15+. Pass `.decodeUseLazyDecoding = YES` to context option `.imageDecodeOptions`
+- Replace conformsToProtocol call with appropriate respondsToSelector check to improve performance #3429
+- Fix del redundant autoreleasepool #3388
+
+### Fixes
+- Avoid store again when origin disk cache hit during Thumbnail or Transformer with smaller pixel size #3428 #3395
+- Add the possible nullable logic check when the force-decode/copy failed #3427
+
+## [5.13.5 - 5.13 Fix, on Oct 29th, 2022](https://github.com/rs/SDWebImage/releases/tag/5.13.5)
+See [all tickets marked for the 5.13.4 release](https://github.com/SDWebImage/SDWebImage/milestone/103)
+
+### Fixes
+- Quick fix the issue that UIImage.sd_decodeOptions cause retain cycle when pass custom cache in context option #3420 #3371
+
+## [5.13.4 - 5.13 Crash Fix, on Sep 26th, 2022](https://github.com/rs/SDWebImage/releases/tag/5.13.4)
+See [all tickets marked for the 5.13.4 release](https://github.com/SDWebImage/SDWebImage/milestone/101)
+
+### Fixes
+- Fix the potential out of bounds crash for ImageIO incremental animation decoding (like GIF) #3408
+
+## [5.13.3 - 5.13 Crash Fix, on Sep 19th, 2022](https://github.com/rs/SDWebImage/releases/tag/5.13.3)
+See [all tickets marked for the 5.13.3 release](https://github.com/SDWebImage/SDWebImage/milestone/100)
+
+### Fixes
+- Try to workaround iOS 15+ crash that CGImage retain the CGImageSource during animation image playing #3387
+- Fix the crash because of SDWebImageCombinedOperation recursive lock #3403
+- Synchronise getter and setter of the cancelled property of the SDWebImageCombinedOperation #3393
+- Fix the switching from animated image rendering to static image does not works on macOS 11+ #3402
+
+## [5.13.2 - 5.13 Patch, on Jul 23th, 2022](https://github.com/rs/SDWebImage/releases/tag/5.13.2)
+See [all tickets marked for the 5.13.2 release](https://github.com/SDWebImage/SDWebImage/milestone/99)
+
+### Fixes
+- Fix the rare case when cancel an async disk cache query may cause twice callback #3380 #3374
+- This Bug effect version 5.13.0-5.13.1
+
+### Warnings
+- Fix pragma mark typo #3379
+
+## [5.13.1 - 5.13 Patch, on Jul 16th, 2022](https://github.com/rs/SDWebImage/releases/tag/5.13.1)
+See [all tickets marked for the 5.13.1 release](https://github.com/SDWebImage/SDWebImage/milestone/98)
+
+### Features
+- Added `SDImageCoderHelper.defaultDecodeSolution` to control the force decode solution. Automatic by default #3368 #3365
+- Now imageByPreparingForDisplay is only applied for JPEG/HEIF images. If you want the 5.12.0 behavior, set the solution to `.uiKit` instead
+
+### Fixes
+- Fix the PDF image without thumbnailPixelSize will result huge bitmap size, now fixed into 72 DPI matching PDFKit #3370
+- Fix `sd_colorAtPoint` and `sd_colorsWithRect` support for grayscale image (white and alpha) #3372
+
+### Warnings
+- Fix the clang analyze issue #3373
+
+## [5.13.0 - Thumbnail, on Jun 27th, 2022](https://github.com/rs/SDWebImage/releases/tag/5.13.0)
+See [all tickets marked for the 5.13.0 release](https://github.com/SDWebImage/SDWebImage/milestone/97)
+
+### Features
+
+#### Thumbnail
+- Change thumbnail cache behavior as expected, share cache through different loading pipeline without extra download #3362
+- Now the thumbnail behavior more like transformer. When request different thumbnail size and cache miss, it prefers to query full size disk cache again, then decode for request thumbnail size without actual network download
+
+#### Coder
+- Added new API for custom coder better handling the thumbnail size #3359
+
+#### Cache
+- Allows store image data only and introduce async API #3336
+- Now the queryCacheOperationForKey API return `SDImageCacheToken` instead of useless placeholder `NSOperation`. When you cancel the cache query from main queue, it will callback in sync instead of async
+
+### Performance
+- Support using iOS 15 UIImage new API imageByPreparingForDisplay for faster force decoding #3355 #3340
+
+### Fixes
+- Fix the encodeMaxPixelSize logic #3357
+- Fix the case when user cancel the image loading for same URL in sequence cause placeholder mass #3363
+
+## [5.12.6 - 5.12 Patch, on Jun 12th, 2022](https://github.com/rs/SDWebImage/releases/tag/5.12.6)
+See [all tickets marked for the 5.12.6 release](https://github.com/SDWebImage/SDWebImage/milestone/95)
+
+### Fixes
+- Fix the thumbnail pixel size calculation when preserveAspectRatio is true #3354
+- Fix macOS compile on Xcode 14 which missing necessary CoreImage import #3353
+- Fix a crash of accessing +[NSScreen mainScreen] from background thread on OSX 10.11. #3337
+
+### Performance
+- Small performance improvement to generating file URLs in SDDiskCache `-setData:forKey:` #3346
+
+## [5.12.5 - 5.12 Patch, on Mar 16th, 2022](https://github.com/rs/SDWebImage/releases/tag/5.12.5)
+See [all tickets marked for the 5.12.5 release](https://github.com/SDWebImage/SDWebImage/milestone/94)
+
+### Fixes
+- Workaround iOS 15+ force decode again using Image Renderer(preferred) and RGB888 #3334
+
+## [5.12.4 - 5.12 Patch, on Mar 8th, 2022](https://github.com/rs/SDWebImage/releases/tag/5.12.4)
+See [all tickets marked for the 5.12.4 release](https://github.com/SDWebImage/SDWebImage/milestone/93)
+
+### Fixes
+- Fix imageView blinks with option `SDImageCacheQueryDiskDataSync` #3327
+- Workaround the iOS 15+ Force Decode may return black image because of CoreGraphics #3332
+
+## [5.12.3 - 5.12 Patch, on Jan 27th, 2022](https://github.com/rs/SDWebImage/releases/tag/5.12.3)
+See [all tickets marked for the 5.12.3 release](https://github.com/SDWebImage/SDWebImage/milestone/92)
+
+### Fixes
+- Fix #3320 decodedAndScaledDownImageWithImage does not render the image completely #3321 Thanks @ty0x2333
+
+## [5.12.2 - 5.12 Patch, on Dec 31st, 2021](https://github.com/rs/SDWebImage/releases/tag/5.12.2)
+See [all tickets marked for the 5.12.2 release](https://github.com/SDWebImage/SDWebImage/milestone/91)
+
+### Fixes
+- Eliminates accumulated floating point errors. #3312
+- Don't copy image data for incremental decoding. #3304
+
+## [5.12.1 - 5.12 Patch, on Oct 15th, 2021](https://github.com/rs/SDWebImage/releases/tag/5.12.1)
+See [all tickets marked for the 5.12.1 release](https://github.com/SDWebImage/SDWebImage/milestone/90)
+
+### Fixes
+- Fix ProMotion display issues #3280
+- Add tvos check when use targetTimestamp in displaylink #3286
+- Revert "Fix image source release in iOS 15" in 5.12.0 #3281
+
+### Warnings
+- Since UTI is an standard, we can use it directly to avoid warning on iOS 15 
+
+### Tests
+- Fix test error #3283
+- Port travis configuration to github actions #3285
+
+## [5.12.0, on Sep 30th, 2021](https://github.com/rs/SDWebImage/releases/tag/5.12.0)
+See [all tickets marked for the 5.12.0 release](https://github.com/SDWebImage/SDWebImage/milestone/89)
+
+### Features
+
+#### Cache
+- Do a extra memory cache sync when weak cache feature enabled && Change the default value for shouldUseWeakMemoryCache to NO #3239 
+- Fix imageFromCacheForKey with options and context behavior, matching the async version one. #3238 
+
+#### Downloader
+- Feature: allow user to custom acceptable status code and content type #3227
+- Change the default delegate method to allows optional cert in SSL verify, matches URLSession's behavior #3241 
+
+#### Animated Image
+- Added sd_imageFrameCount convenient API for UIAinmatedImage/NSBitmapImageRep #3243 
+- Make SDAnimatedImageRep confirms to correct copy semantic #3258
+
+### Fixes
+- Fix image source release in iOS 15 #3276 
+- Fix wrong memory cost in _UIAnimatedImage #3237 
+- Fix pixel ratio thumbnail calculation #3277
+- Fix the warning, enable APPLICATION_EXTENSION_API_ONLY for all framework target #3236 
+
+## [5.11.1 - 5.11 Patch, on Apr 23rd, 2021](https://github.com/rs/SDWebImage/releases/tag/5.11.1)
+See [all tickets marked for the 5.11.1 release](https://github.com/SDWebImage/SDWebImage/milestone/88)
+
+### Changes
+- Change the .originalStoreCaheType and .originalQueryCacheType into .disk, Now we will store the full image data into disk and re-query the full image data by default #3219
+- Change the willTerminate auto clean cache logic into sync version #3210
+
+### Fixes
+- Fix the bug that when querying original cache miss, the download process will be skipped. This is not designed behavior #3221
+- Ensure the invalid URLSeesion will receive the cancel callback and does not trigger the any exception from framework #3205
+
+### Documentation
+- Fix spelling error in SDWebImageDownloaderOperation #3220
+
+## [5.11.0 - Performance, on Apr 1st, 2021](https://github.com/rs/SDWebImage/releases/tag/5.11.0)
+See [all tickets marked for the 5.11.0 release](https://github.com/SDWebImage/SDWebImage/milestone/84)
+
+### Features
+#### Transformer
+- Added the new context option SDWebImageContextOriginalImageCache, which control the cache instance used for original full size image query/write when using transformer #3184 
+
+### Performance
+- Increase progressive decoding performance by using the progressive decoder's result instead of re-decoding the full image data #3182 
+- Avoid the strong retain during download decoding, this can make the download operation fast to destroy and reduce memory peak, especially in progressive decoding #3183 
+
+### Fixes
+- Don't encode/decode image when app will terminated #3149 
+
+
+## [5.10.4 - 5.10 Patch, on Feb 2nd, 2021](https://github.com/rs/SDWebImage/releases/tag/5.10.4)
+See [all tickets marked for the 5.10.4 release](https://github.com/SDWebImage/SDWebImage/milestone/87)
+
+### Performance
+- Don't unnecessarily copy image data in the Download Operation #3167
+
+## [5.10.3 - 5.10 Patch, on Jan 24th, 2021](https://github.com/rs/SDWebImage/releases/tag/5.10.3)
+See [all tickets marked for the 5.10.3 release](https://github.com/SDWebImage/SDWebImage/milestone/86)
+
+### Fixes
+- Fixed the store cache type was specified to `SDImageCacheTypeDisk ` that pictures shouldn't cache to memory. #3157
+
+## [5.10.2 - 5.10 Patch, on Dec 29th, 2020](https://github.com/rs/SDWebImage/releases/tag/5.10.2)
+See [all tickets marked for the 5.10.2 release](https://github.com/SDWebImage/SDWebImage/milestone/85)
+
+### Fixes
+- Fix the case that we setFinished=YES before NSOperation started. This may cause exception from Foundation #3146
+
+## [5.10.1 - 5.10 Patch, on Dec 25th, 2020](https://github.com/rs/SDWebImage/releases/tag/5.10.1)
+See [all tickets marked for the 5.10.1 release](https://github.com/SDWebImage/SDWebImage/milestone/83)
+
+### Fixes
+- Fix the race condition when user cancel the network loading will not trigger the completion block #3142
+- Fix deprecation warnings for OSSpinLock #3137
+
+## [5.10.0 - iOS 9+/Xcode 11+, on Nov 22nd, 2020](https://github.com/rs/SDWebImage/releases/tag/5.10.0)
+See [all tickets marked for the 5.10.0 release](https://github.com/SDWebImage/SDWebImage/milestone/82)
+
+### Project
+- Bumped the min deployment target version to iOS 9, macOS 10.11. Bumped the min Xcode version to Xcode 11 #3130 
+- This effect the downstream dependencies like [SDWebImageWebPCoder](https://github.com/SDWebImage/SDWebImageWebPCoder), you may update them to the latest version at the same time.
+
+### Features
+#### Animated Image
+- Add animation playback mode for SDAnimatedImageView/Player, including reverse, bounce and reversed bounce #3115 
+
+#### Custom Loader
+- Added the options and context arg for Image Loader custom protocol, this can be used for advanced user to grab and check for context for current loading URL to process the logic #3129 
+
+#### Performance
+- Replace all current dispatch_semaphore usage into the os_unfair_lock, use OSSpinLock for lower firmware #3128 
+
+## [5.9.5 - 5.9 Patch, on Nov 13th, 2020](https://github.com/rs/SDWebImage/releases/tag/5.9.5)
+See [all tickets marked for the 5.9.5 release](https://github.com/SDWebImage/SDWebImage/milestone/81)
+
+### Fixes
+- Add animationImages support when using SDAnimatedImageView #3113
+
+## [5.9.4 - 5.9 Patch, on Oct 13th, 2020](https://github.com/rs/SDWebImage/releases/tag/5.9.4)
+See [all tickets marked for the 5.9.4 release](https://github.com/SDWebImage/SDWebImage/milestone/80)
+
+### Fixes
+- Fix race condition when using transitions that are canceled and then switched to a new transition or load operation #3108 #3107
+- Fixed the store cache type was specified to `SDImageCacheTypeDisk ` that no pictures were obtained when the disk had pictures #3110
+
+## [5.9.3 - 5.9 Patch, on Oct 13th, 2020](https://github.com/rs/SDWebImage/releases/tag/5.9.3)
+See [all tickets marked for the 5.9.3 release](https://github.com/SDWebImage/SDWebImage/milestone/79)
+
+### Fixes
+- Fix coder priority inverse in SDAnimatedImage #3101
+- Fix that SDImageCache will automatically store the disk image into memory cache even if store cache type is disk #3104
+
+## [5.9.2 - 5.9 Patch, on Sep 29th, 2020](https://github.com/rs/SDWebImage/releases/tag/5.9.2)
+See [all tickets marked for the 5.9.2 release](https://github.com/SDWebImage/SDWebImage/milestone/78)
+
+### Fixes
+- Fix the issue that SDAnimatedImageView will trigger an empty callback when animation stopped. This will cause some bad effect such as rendering a empty image or placeholder image (especially on iOS 14) #3092
+- Fix: `duration` is not used in SDWebImageTransition convenience initializers. #3094
+
+## [5.9.1 - 5.9 Patch, on Sep 11th, 2020](https://github.com/rs/SDWebImage/releases/tag/5.9.1)
+See [all tickets marked for the 5.9.1 release](https://github.com/SDWebImage/SDWebImage/milestone/77)
+
+### Fixes
+- Fix the issue of SDAnimatedImage initWithContentsOfFile where the path name less than 3 characters #3081
+
+## [5.9.0 - iOS 14 WebP, on Aug 27th, 2020](https://github.com/rs/SDWebImage/releases/tag/5.9.0)
+See [all tickets marked for the 5.9.0 release](https://github.com/SDWebImage/SDWebImage/milestone/72)
+
+### Features
+
+#### Image
+- Supports built-in WebP/AWebP codec from ImageIO for iOS 14/tvOS 14/macOS 11/watchOS 7 #3048
+- To use, add `SDImageAWebPCoder` to your coders manager. Note built-in WebP currently supports decoding only, for encoding, you still need `SDImageWebPCoder`
+- Add the support to pass small bytes to `decodedAndScaledDownLargeImage`, which always scale down (at least 1x1 pixel) but not return the original size #3067
+
+#### Cache
+- Supports the user to customize the default disk cache directory, which can be used to share cache for App && App Extension #3066
+
+#### View Category
+- Adjust the current behavior to use transition. Now it automatically do transition when manager callback asynchronously (if user see waiting, then do transition) #3074
+
+### Fixes
+- Fix the bug when the thumbnail pixel size is larger than the pixel size, and the image has EXIF orientation, the final UIImage will use wrong image orientation #3070
+- Fix the image format detection for smaller SVG which less than 100 Bytes #3072
+
+## [5.8.4 - 5.8 Patch, on July 16th, 2020](https://github.com/rs/SDWebImage/releases/tag/5.8.4)
+See [all tickets marked for the 5.8.4 release](https://github.com/SDWebImage/SDWebImage/milestone/76)
+
+### Fixes
+- Try to copy the local NSMutableDictionary before calling CGImageSourceCreateImageAtIndex, try to solve the rare crash inside ImageIO call stack #3052
+- Fix race condition when use transition but canceling an operation #3053
+
+## [5.8.3 - 5.8 Patch, on July 2nd, 2020](https://github.com/rs/SDWebImage/releases/tag/5.8.3)
+See [all tickets marked for the 5.8.3 release](https://github.com/SDWebImage/SDWebImage/milestone/75)
+
+### Changes
+- Add the support for that UIImage+MultiFormat methods on SDAnimatedImage, which supports encoding the animation like GIF/APNG/WebP with lower compression quality #3047
+
+### Fixes
+- Fix the issue of iOS 14 vector image rendering on SDAnimatedImageView #3046
+
+## [5.8.2 - 5.8 Patch, on June 23rd, 2020](https://github.com/rs/SDWebImage/releases/tag/5.8.2)
+See [all tickets marked for the 5.8.2 release](https://github.com/SDWebImage/SDWebImage/milestone/74)
+
+### Fixes
+- Fix the issue that SDAnimatedImageView can not render static image on iOS 14. #3043
+- Fix the `maxPixelSize` logic issue will cause a upscale in SDImageIOAnimatedCoder #3039
+
+## [5.8.1 - 5.8 Patch, on June 12th, 2020](https://github.com/rs/SDWebImage/releases/tag/5.8.1)
+See [all tickets marked for the 5.8.1 release](https://github.com/SDWebImage/SDWebImage/milestone/73)
+
+### Features
+- Added the convenient transition with duration APIs #3027
+
+### Fixes
+- Fix the issue that the NSURLRequest method should not be nil, which may cause Crash #3037
+- Fix the issue when `maxPixelSize` is larger than image size will cause a upscale in ImageIO #3015
+- Change to use `kCGImageSourceCreateThumbnailFromImageAlways` to solve the issue when HEIC/JPEG contains an embed thumbnail but its size is much smaller than provided `maxPixelSize` #3038
+- SDAnimatedImagePlayer seek returning nil image fix #3030
+- Fixing Typos throughout project #3026
+
+## [5.8.0 - Transform original cache and more, on May 11th, 2020](https://github.com/rs/SDWebImage/releases/tag/5.8.0)
+See [all tickets marked for the 5.8.0 release](https://github.com/SDWebImage/SDWebImage/milestone/69)
+
+### Features
+
+#### Transformer
+- Add query original cache for transformed image without downloading #2992
+- This can be used to query the original image from cache then do transforming when transformed key cache miss, without any downloading happened.
+
+#### Animated Image
+- Added autoplay control property to AnimatedImageView (autoPlayAnimatedImage) #3003
+
+#### Manager
+- Mark the black list formal error code, support remove the failed URL from black list #2997
+- Polish the error description between image decode failed and image size is 0 #3005
+
+#### Downloader
+- Add the convenient request/response modifier, which provide HTTP header directly #2990
+
+#### View Category
+- Added the convenient transition options for macOS user. Deprecate the old timingFunction, which can use System API to achieve #2985
+- Feature pass the set operation key into context option from upstream. Fix the potential retain cycle if user use custom manager #2986
+
+#### Coder
+- Feature: Encoding options supports embed thumbnail (works for JPEG/HEIF/AVIF) #2988
+
+#### Project
+- Support the SwiftPM Objective-C user to use `#improt <SDWebImage/SDWebImage.h>` #2987
+
+## [5.7.4 - 5.7 Patch, on May 6th, 2020](https://github.com/SDWebImage/SDWebImage/releases/tag/5.7.4)
+See [all tickets marked for the 5.7.4 release](https://github.com/SDWebImage/SDWebImage/milestone/71)
+
+### Fixes
+- Fix the issue that NSOperation conforms to `SDWebImageOperation` check failed. Fix cancelling prefetcher hung up #2999 #2998
+
+## [5.7.3 - 5.7 Patch, on Apr 21st, 2020](https://github.com/SDWebImage/SDWebImage/releases/tag/5.7.3)
+See [all tickets marked for the 5.7.3 release](https://github.com/SDWebImage/SDWebImage/milestone/70)
+
+### Fixes
+- Fix the encoding options which does not passthrough the correct value to ImageIO #2989
+
+## [5.7.2 - 5.7 Patch, on Apr 11th, 2020](https://github.com/SDWebImage/SDWebImage/releases/tag/5.7.2)
+See [all tickets marked for the 5.7.2 release](https://github.com/SDWebImage/SDWebImage/milestone/68)
+
+### Fixes
+- SDAnimatedImageView animation rendering should not use CGContext force decoding, use `kCGImageSourceShouldCacheImmediately` instead which can avoid OOM for large number of GIFs #2977
+- Fix that when first play animated image and use maxBufferSize to 0, the calculation does not works (The CGImage is nil) #2982
+
+### Project
+- Rename the private header `UIColor+HexString` and `NSBezierPath+SDRoundedCorners` with SD prefix, to avoid the conflict when using CocoaPods #2983
+
+## [5.7.1 - 5.7 Patch, on Apr 8th, 2020](https://github.com/SDWebImage/SDWebImage/releases/tag/5.7.1)
+See [all tickets marked for the 5.7.1 release](https://github.com/SDWebImage/SDWebImage/milestone/67)
+
+### Fixes
+- Don't copy attributes from originalImage to transformedImage when caching transformedImage #2976. Thanks @bdaz
+- Fix the wrong value assignment for SDAnimatedImageView code on macOS, warning #2974
+
+## [5.7.0 - Query Cache Type and Encoding Options, on Apr 4th, 2020](https://github.com/rs/SDWebImage/releases/tag/5.7.0)
+See [all tickets marked for the 5.7.0 release](https://github.com/SDWebImage/SDWebImage/milestone/66)
+
+### Features
+
+#### Cache
+- Added the async version API to query disk image data only
+- Added the sync API to query disk image with context and options, which matches the async version
+
+#### Coder
+- Feature supports encoding options like max file size, max pixel size, as well as background color when using JPEG for alpha image #2972
+- You can use `.encodeMaxFileSize` to limit the desired lossy file size, better than compression quality
+- You can use `.encodeMaxPixelSize` to limit the pixel size, like thumbnail encoding
+
+#### Transformer
+- Refactory the current thumbnail && transformer about cache key. Developer should have the API to calculate the cache key from thumbnail or transformer, not hard-coded. #2966
+
+#### Context Option
+- Added new query cache type support, including the SDImageCache API and context option #2968
+- You use `.queryCacheType` to query image from memory/disk/both cache during image pipeline loading
+
+### Fixes
+- Fix the issue for Carthage/SwiftPM framework version symbols, this should match the framework name SDWebImage, or will get a link error when used #2971 #2969
+- Simplify the xattr helper method's code with modern Objective-C syntax #2967. Thanks @huangboju 
+
+### Changes
+- Change the behavior to return the abstract type for unknown image format, this can solve the accident issue for custom coder who provide a new format #2973
+
+## [5.6.1 - 5.6 Patch, on Mar 13th, 2020](https://github.com/rs/SDWebImage/releases/tag/5.6.1)
+See [all tickets marked for the 5.6.1 release](https://github.com/SDWebImage/SDWebImage/milestone/65)
+
+### Performances
+- Keep the progressive decoding process only exist one per image download. Cancel the unused progressive decoding when full pixel data is available. #2483
+
+### Fixes
+- Fix the NotificationCenter does not remove the observer and little private header garden #2959
+
+## [5.6.0 - URLSession Metrics && Vector Format, on Mar 5th, 2020](https://github.com/rs/SDWebImage/releases/tag/5.6.0)
+See [all tickets marked for the 5.6.0 release](https://github.com/SDWebImage/SDWebImage/milestone/63)
+
+### Features
+
+#### URLSession Metrics
+- Added the URLSessionTaskMetrics support for downloader && operation, which can be used for network metrics #2937
+- Typically you use custom operation class to collect all metrics in your app. You can also collect metrics for single url request level. Check the #2937 example code to grab the download token and check metrics.
+
+#### Vector Image
+- Feature - better support for vector format detection, now PDF rasterized bitmap is built-in #2936
+- Pass `.thumbnailPixelSize` to control the PDF bitmap size. If you want vector PDF rendering, you still need to use [SDWebImagePDFCoder](https://github.com/SDWebImage/SDWebImagePDFCoder).
+- Vector image like SVG (via [SDWebImageSVGCoder](https://github.com/SDWebImage/SDWebImageSVGCoder)) and PDF (via [SDWebImagePDFCoder](https://github.com/SDWebImage/SDWebImagePDFCoder)), or system symbol images, can be detected by new API `sd_isVector`.
+- Vector image does not pass to transformer by default, because they support dynamic size changing. Pass `.transformVectorImage` option to allow transformation.
+
+#### Cache
+- Add a better check to handle the cases when call `storeImage` without imageData #2953
+- Which means, if you store image to disk without data, we will use extra information via `sd_imageFormat` or custom image class, to choose the the image format (including GIF and PDF) for encoding. Previously we only encode it into PNG or JPEG.
+
+#### Context Option
+- Feature add context option for cache, loader and coder, deprecated SDWebImageContextCustomManager #2955
+- This makes it easy to use custom loader, cache, and decoder, without need to create a dummy SDWebImageManager instance.
+
+### Fixes
+- Fix the rare case when call `SDWebImageDownloaderOperation.cancel`, the completion block may callback twice #2954
+
+### Warnings
+- Suppress the deprecation warning when min deployment target version set to iOS 13+ or macCatalyst
+- Complete all the SDWebImage error code with the localized description, make it easy for debugging #2948
+
+## [5.5.2 - 5.5 Patch, on Jan 26th, 2020](https://github.com/rs/SDWebImage/releases/tag/5.5.2)
+See [all tickets marked for the 5.5.2 release](https://github.com/SDWebImage/SDWebImage/milestone/62)
+
+### Fixes
+- Fix the issue that `maxBufferSize` property does not correctly works for `SDAnimatedImageView` #2934
+
+## [5.5.1 - 5.5 Patch, on Jan 18th, 2020](https://github.com/rs/SDWebImage/releases/tag/5.5.1)
+See [all tickets marked for the 5.5.1 release](https://github.com/SDWebImage/SDWebImage/milestone/59)
+
+### Fixes
+- Fix the SDAnimatedImageView's progressive animation bug, which reset the frame index to 0 each time new frames available #2931
+
+## [5.5.0 - Thumbnail Decoding && Core Image, on Jan 16th, 2020](https://github.com/rs/SDWebImage/releases/tag/5.5.0)
+See [all tickets marked for the 5.5.0 release](https://github.com/SDWebImage/SDWebImage/milestone/55)
+
+### Features
+
+#### Thumbnail Decoding
+- Supports to load the large web image with thumbnail, control the limit size and aspect ratio #2922 #2810
+- Better than resize transformer, which does not allocate full pixel RAM and faster on CPU. If you've already use transformer to generate thumbnail, you'd better have a try
+- Works for both animated images and progressive images, each frame using the thumbnail decoding
+- Applies for Vector Format like SVG/PDF as well, see more in [Coder Plugin List](https://github.com/SDWebImage/SDWebImage/wiki/Coder-Plugin-List)
+
+#### Core Image
+- Support all transformer method on CIImage based UIImage/NSImage #2918
+- For CIImage based UIImage/NSImage, using the CIFilter to take shortcut, which is faster and lazy (rasterize on demand)
+
+#### Cache
+- Support to use the creation date and the change date to determine the disk cache expire date compare #2915
+
+### Performances
+- Using UIGraphicsImageRenderer on iOS 10+, save memory when image bitmap is RGB(-25%) or Grayscale(-75%) #2907
+- Provide the polyfill APIs for firmware iOS 10- and macOS. If you already use `SDGraphicsBeginImageContext` for drawing, you'd better replace that instead.
+
+### Fixes
+- Fix Gaussian Blur's bug which take half of the blur radius compared to the standard, should match Core Image's behavior #2927
+
+## [5.4 Patch, on Jan 18th, 2020](https://github.com/rs/SDWebImage/releases/tag/5.4.3)
+See [all tickets marked for the 5.4.3 release](https://github.com/SDWebImage/SDWebImage/milestone/61)
+
+### Fixes
+- Fix the SDAnimatedImageView's progressive animation bug, which reset the frame index to 0 each time new frames available #2931
+
+## [5.4.2 - 5.4 Patch, on Jan 7th, 2020](https://github.com/rs/SDWebImage/releases/tag/5.4.2)
+See [all tickets marked for the 5.4.2 release](https://github.com/SDWebImage/SDWebImage/milestone/58)
+
+### Fixes
+- SDAnimatedImage now only keep the animated coder when frame count >=1 , else we will behave like UIImage to save RAM usage #2924
+
+## [5.4.1 - 5.4 Patch, on Dec 27th, 2019](https://github.com/rs/SDWebImage/releases/tag/5.4.1)
+See [all tickets marked for the 5.4.1 release](https://github.com/SDWebImage/SDWebImage/milestone/56)
+
+### Fixes
+- Fix the issue that "There may be no complete callback when download the picture of the local path" #2917
+
+## [5.4.0 Extended Cache Metadata, on Dec 6th, 2019](https://github.com/rs/SDWebImage/releases/tag/5.4.0)
+See [all tickets marked for the 5.4.0 release](https://github.com/SDWebImage/SDWebImage/milestone/51)
+
+### Features
+
+#### Cache
+- Allows advanced user to read/write extended metadata associated with image data from disk cache #2898
+- This metadata will be processed at the same time when store or query the image. The metadata should conforms to `NSCoding` for archive and unarchive.
+
+#### Manager
+- Add `SDWebImageWaitStoreCache`, which wait for all the async disk cache written finished and then callback, useful for advanced user who want to touch the cache right in completion block #2900
+
+### Fixes
+- Using one global function to ensure we always sync all the UIImage category associated object status correctly inside our framework #2902
+- Fix the thread safe issue with Downloader and DownloaderOperation during cancel #2903
+
+## [5.3 Patch, on Jan 18th, 2020](https://github.com/rs/SDWebImage/releases/tag/5.3.4)
+See [all tickets marked for the 5.3.4 release](https://github.com/SDWebImage/SDWebImage/milestone/60)
+
+### Fixes
+- Fix the SDAnimatedImageView's progressive animation bug, which reset the frame index to 0 each time new frames available #2931
+
+## [5.3 Patch, on Dec 3rd, 2019](https://github.com/rs/SDWebImage/releases/tag/5.3.3)
+See [all tickets marked for the 5.3.3 release](https://github.com/SDWebImage/SDWebImage/milestone/54)
+
+### Fixes
+- Fix the crash when using NSCache delegate with SDMemoryCache default implementation on dealloc #2899
+
+## [5.3 Patch, on Nov 22nd, 2019](https://github.com/rs/SDWebImage/releases/tag/5.3.2)
+See [all tickets marked for the 5.3.2 release](https://github.com/SDWebImage/SDWebImage/milestone/53)
+
+### Fixes
+- Fix animated image playback bugs that cause rendering frame is previous frame index #2895. Thanks @ZXIOU 
+
+## [5.3 Patch, on Nov 9th, 2019](https://github.com/rs/SDWebImage/releases/tag/5.3.1)
+See [all tickets marked for the 5.3.1 release](https://github.com/SDWebImage/SDWebImage/milestone/52)
+
+### Fixes
+- Fix the case even when Animated Image View is not visible, user call startAnimating can still do animation #2888
+
+## [5.3.0 Animated Player & Data Decryptor, on Nov 6th, 2019](https://github.com/rs/SDWebImage/releases/tag/5.3.0)
+See [all tickets marked for the 5.3.0 release](https://github.com/SDWebImage/SDWebImage/milestone/45)
+
+### Features
+
+#### Animated Image
+- Refactoring the SDAnimatedImageView with player backend called `SDAnimatedImagePlayer`, make it easier for common usage. #2882
+- The player use protocol based implementation, which can be used for many scenarios, like WatchKit, CALayer, or even SwiftUI. See [wiki](https://github.com/SDWebImage/SDWebImage/wiki/Advanced-Usage#animated-player-530)
+- Supports the control of AnimatedImage View/Player 's play rate #2885
+- Supports the runloop mode control for macOS. Which can be useful when user want to pause animation when drag the mouse, or presenting modal window #2886
+
+#### Data Decryptor
+- Decrypt the encrypted image data after download and just before decoding. #2866
+- Provide a built-in convenience for Base64-encoded image data. See [wiki](https://github.com/SDWebImage/SDWebImage/wiki/Advanced-Usage#data-decryptor-530)
+
+#### Response Modifier
+- Modify the HTTP response after download, paired with request modifier #2866
+- Can be used for custom HTTP header check, mock data, etc. See [wiki](https://github.com/SDWebImage/SDWebImage/wiki/How-to-use#use-response-modifier-530)
+
+## [5.2 Patch, on Oct 27th, 2019](https://github.com/rs/SDWebImage/releases/tag/5.2.5)
+See [all tickets marked for the 5.2.5 release](https://github.com/SDWebImage/SDWebImage/milestone/50)
+
+### Fixes
+- Fix macOS SDWebImageIndicator center layout issue when indicator was initialized with 0 frame #2875
+
+## [5.2 Patch, on Oct 27th, 2019](https://github.com/rs/SDWebImage/releases/tag/5.2.4)
+See [all tickets marked for the 5.2.4 release](https://github.com/SDWebImage/SDWebImage/milestone/49)
+
+### Fixes
+- Fix the regression issue that SDAnimatedImageView on macOS will change the wrong duration speed when pause and resume again #2873
+- Fix SDAnimatedImage on macOS use extra animates property check, which is not intuitive and cause extra setup before usage #2874
+
+## [5.2 Patch, on Oct 9th, 2019](https://github.com/rs/SDWebImage/releases/tag/5.2.3)
+See [all tickets marked for the 5.2.3 release](https://github.com/SDWebImage/SDWebImage/milestone/48)
+
+### Fixes
+- Revert the change for APNG constants fix for iOS 8 devices which cause crash #2863
+
+## [5.2 Patch, on Oct 2rd, 2019](https://github.com/rs/SDWebImage/releases/tag/5.2.2)
+See [all tickets marked for the 5.2.2 release](https://github.com/SDWebImage/SDWebImage/milestone/47)
+
+### Fixes
+- Fix warnings when deployment target version set to iOS 13+ #2860 #2859
+
+## [5.2 Patch, on Oct 1st, 2019](https://github.com/rs/SDWebImage/releases/tag/5.2.1)
+See [all tickets marked for the 5.2.1 release](https://github.com/SDWebImage/SDWebImage/milestone/46)
+
+### Fixes
+- Make the SDWebImageDownloadToken to not retain the completion block so that user don't need weak-strong dance #2856 #2855
+
+### Tests
+- Try to fix the test case `test15DownloaderLIFOExecutionOrder` #2857
+
+## [5.2.0 - Mac Catalyst && HEIC Animation, on Sep 27th, 2019](https://github.com/rs/SDWebImage/releases/tag/5.2.0)
+See [all tickets marked for the 5.2.0 release](https://github.com/SDWebImage/SDWebImage/milestone/43)
+
+### Features
+
+#### Mac Catalyst
+- Full compatible with Catalyst (UIKit for macOS)
+- Supports CococaPods and SwiftPM only. Carthage need their own toolchain upgrade in the future
+- Provide the build script to build xcframework contains Mac Catalyst variant, see [Installation Guide](https://github.com/SDWebImage/SDWebImage/wiki/Installation-Guide).
+
+#### Image Coder
+- Supports HEIC sequence (animated) image on iOS 13/macOS 10.15+ #2849
+    - Note the HEIC animated coder does not enable by default. Add `SDImageHEICCoder` if you need the animation.
+- Refactor APNG and GIF coder implementation with abstract base class #2846
+    - Now we use `SDImageIOAnimatedCoder` base class for all animated Image/IO coder implementation. Developer can get use of this as well.
+
+#### Animated Image
+- Support to clear frame buffer or reset frame index when stopped for SDAnimatedImageView #2815
+
+### Fixes
+- Fix the downloader LIFO order inverse issue when adding new urls during previous url query #2852 #2823
+- Fix the macOS SDAnimatedImageRep to match Netscape standard of GIF loop count, which should use 1 when there are no loop count information #2847 #2155
+
+## [5.1 Patch, on Sep 5th, 2019](https://github.com/rs/SDWebImage/releases/tag/5.1.1)
+See [all tickets marked for the 5.1.1 release](https://github.com/SDWebImage/SDWebImage/milestone/44)
+
+### Fixes
+
+- Fix that some option mask check with local BOOL variable, error result on 32 bit device. #2819 #2817
+- Fix the macOS that SDAnimatedImageView does not works for imageScaling and imageAlignment properties #2820
+- Fix the case when SDAnimatedImageView dealloc on the fetch queue, will cause it trigger the UIKit/AppKit method on non-main queue and captured by UI Main Thread Checker #2825
+
+## [5.1.0 - SwiftPM and more, on Aug 3rd, 2019](https://github.com/rs/SDWebImage/releases/tag/5.1.0)
+See [all tickets marked for the 5.1.0 release](https://github.com/SDWebImage/SDWebImage/milestone/38)
+
+### Features
+
+#### Swift Package Manager
+
+- Add support for Swift Package Manager #2756
+
+#### Options Processor
+
+- Supports global control on options and context for individual image request #2736
+
+#### Context Option
+
+- Supports store original image to cache for transformer via `SDWebImageContextOriginalStoreCacheType` #2590
+- Add a new option `SDWebImageMatchAnimatedImageClass`, to ensure we always match the custom image class instead of UIImage/NSImage class #2801
+
+#### Cache
+
+- Expose the memoryCache and diskCache object on `SDImageCache`, Make it useful for user who have custom property beyond `SDImageCacheConfig` #2779
+
+### Fixes
+
+- Fix SDAnimatedImageView's frame buffer bug when display link is pause #2782
+- Fix the bug that UIButton setBackgroundImage convenient method does not pass the options arg to next function call #2785
+- Add a autoreleasepool when prefetch many images #2792
+- Feature supports dynamic style indicator for iOS 13, fix indicator color on macOS 10.14+ #2753
+- Fix for CocoaPods modular headers warning by removing the custom modulemap #2749
+
+### Project
+
+- Follow App Store submit rule, upgrade the minimum Xcode version to Xcode 10.0 #2780
+- Provide a script target to directly build all SDWebImage framework and generate all in one XCFramework from Xcode 11 #2764
+
+### Notable Behavior Changes
+
+- Ensure we always callback user's completion block even when cancelled with `SDWebImageErrorCancelled` error code #2692
+
+This may effect some users. In previous 4.0~5.0 version, we will not callback completion block when we receive `cancel` call. (including all View Category/Cache/Manager/Downloader APIs)
+
+But from 5.1, we always callback on this case with error code `SDWebImageErrorCancelled`. You can filter this error code if you don't care about cancel.
+
+This change makes usages like Dispatch Group, observer, or any logic which relay on the completion's callback become acceptable, which is not reliable and will cause issue in previous versions.
+
+- Change that the `sd_imageProgress` property to not auto-create instance by framework #2763
+
+Now, we don't create the NSProgress object from internal method call, this does not affect user's KVO usage.
+
+- Change the default value of accept request header #2772
+
+Now, the default HTTP header filed `Accept`, use `image/*,*/*;q=0.8`, instead of `image/*;q=0.8`.
+
+## [5.0 Patch, on Jun 5th, 2019](https://github.com/rs/SDWebImage/releases/tag/5.0.6)
+See [all tickets marked for the 5.0.6 release](https://github.com/SDWebImage/SDWebImage/milestone/42)
+
+#### Fixes
+- Fix the SDAnimatedImageRep which use the deprecated API and cause compile issue on Xcode 11 #2745
+
+## [5.0 Patch, on Jun 3rd, 2019](https://github.com/rs/SDWebImage/releases/tag/5.0.5)
+See [all tickets marked for the 5.0.5 release](https://github.com/SDWebImage/SDWebImage/milestone/41)
+
+#### Project
+- Fix the Static Library target issue of headers, which cause the integrated application failed to Archive because of copied headers #2741
+
+## [5.0 Patch, on May 29th, 2019](https://github.com/rs/SDWebImage/releases/tag/5.0.4)
+See [all tickets marked for the 5.0.4 release](https://github.com/SDWebImage/SDWebImage/milestone/40)
+
+#### Fixes
+- Fix get button background image operation key bug #2737
+- Fix that `CGImageDestinationCreateWithData` 0 count arg will log a warning #2739
+
+#### Tests
+- Fix the example NSLog issue, and replace the unavailable test image dataset #2740
+
+## [5.0 Patch, on May 16th, 2019](https://github.com/rs/SDWebImage/releases/tag/5.0.3)
+See [all tickets marked for the 5.0.3 release](https://github.com/SDWebImage/SDWebImage/milestone/39)
+
+#### Fixes
+- Fix SDWebImageDecodeFirstFrameOnly flag is ignored when image loaded from cache #2725
+- Fix that SDAnimatedImageView initWithImage will skip the initialize logic and crash #2728
+- Replace if judge with MAX() function in scale less than 1 #2710
+
+#### Project
+- Replace the private prefix header files with the manually import for each implementation files #2723
+
+#### Tests
+- Added many test case to ensure the code behavior and coverage #2711
+
+#### Documentation
+- Update the documentation coverage for jazzy. Use the correct format to provide class/protocol/type API Documentation #2722
+
+## [5.0 Patch, on Apr 25th, 2019](https://github.com/rs/SDWebImage/releases/tag/5.0.2)
+See [all tickets marked for the 5.0.2 release](https://github.com/SDWebImage/SDWebImage/milestone/37)
+
+#### Fixes
+- Fix the bug of SDAnimatedImageView on macOS, which can only render `SDAnimatedImage` but not normal NSImage (including animated image) #2706
+- Fix that `CGImageCreateDecoded:orientation:` use the wrong aspect ratio when orientation is left/leftMirrored/right/rightMirrored #2708
+- Fix one bug of sd_colorAtPoint:, which set the alpha value default to 255 and should be 1. #2708
+
+#### Documentation
+- Fixes typo in SDImageCacheConfig maxDiskAge info #2699
+
+## [5.0 Patch, on Apr 11th, 2019](https://github.com/rs/SDWebImage/releases/tag/5.0.1)
+See [all tickets marked for the 5.0.1 release](https://github.com/SDWebImage/SDWebImage/milestone/36)
+
+#### Fixes
+- Fixes crash for apng coder when properties are nil #2691
+- Fix rounded corner bug which leads to image upside down #2673
+- Fix tint image bug which leads to image upside down #2674
+
+#### Project
+- Fix the Travis-CI script about code coverage submit #2676
+
+## [5.0.0 Major release - Customizable SDWebImage, on Apr 2nd, 2019](https://github.com/rs/SDWebImage/releases/tag/5.0.0)
+See [all tickets marked for the 5.0.0 release](https://github.com/SDWebImage/SDWebImage/milestone/15)
+
+### Features
+
+#### Animated Image
+- Introduce `SDAnimatedImageView` and `SDAnimatedImage` for full stack solution of animated images.
+- Supports custom coders for nearly every animated image format.
+- Supports progressive loading for animated images.
+- iOS/tvOS/macOS cross-platform support.
+
+#### Transformer
+- Using transformer to apply image processing after image was loaded.
+- Built-in transformer for common usage: Rounded Corner, Resize, Crop, Flip, Rotate, Tint Color, Blur Effect, Core Image Filter...
+- Convenient category methods for `UIImage`/`NSImage`
+
+#### Custom Loader
+- Using `SDImageLoader` protocol to implements your own image loader.
+- Not limited on HTTP, you can even using SDWebImage with PhotoKit and third-party SDKs.
+- Supports multiple loaders at the same time when using `SDImageLoadersManager`.
+
+#### Custom Cache
+- Using `SDImageCache` protocol to implement your own image cache.
+- Standalone disk cache and memory cache class for advanced usage and customization.
+- Supports multiple caches at the same time when using `SDImageCachesManager`.
+
+#### Indicator
+- Use indicator to provide a loading view, customizable.
+- Built-in Activity Indicator and Progress Indicator.
+- iOS/tvOS/macOS cross-platform support.
+
+#### Plugins
+- All external image format coders are plugins. Supports WebP, HEIF, BPG, FLIF, SVG, PDF... Choose what you need in: [Coder Plugin List](https://github.com/SDWebImage/SDWebImage/wiki/Coder-Plugin-List)
+- PhotoKit loader as a plugin: [SDWebImagePhotosPlugin](https://github.com/SDWebImage/SDWebImagePhotosPlugin)
+- FLAnimatedImage integration as a plugin: [SDWebImageFLPlugin](https://github.com/SDWebImage/SDWebImageFLPlugin)
+- YYImage/YYCache integration as a plugin: [SDWebImageYYPlugin](https://github.com/SDWebImage/SDWebImageYYPlugin)
+
+### Improvements
+
+#### Swift
+- Better Swift support with some manual renaming APIs.
+- Full nullability annotation.
+- Using class property for shared instance.
+- Using `NS_TYPED_ENUM` and `NS_STRING_ENUM` for better generated APIs.
+
+#### API
+- Using context option to control detail behavior for each image request beyond the limit of enums.
+- Using prefetcher to manage token (list of URL requests) to avoid conflict.
+- Use request modifier to modify constructed URLRequest.
+
+### Project
+
+- Supports the latest Xcode 10.
+- Supports iOS 8.0+/tvOS 9.0+/watchOS 2.0+/macOS 10.10+.
+- MapKit support for Carthage moved the standalone `SDWebImageMapKit` target.
+- Using module map and umbrella headers.
+
+### Migration
+
+Check [5.0 migration guide](https://github.com/SDWebImage/SDWebImage/wiki/5.0-Migration-guide) for the migration from 4.x to 5.x.
+
+
+## [5.0.0-beta6 - 5.0 Beta, on Mar 15th, 2019](https://github.com/rs/SDWebImage/releases/tag/5.0.0-beta6)
+See [all tickets marked for the 5.0.0-beta6 release](https://github.com/rs/SDWebImage/milestone/30)
+
+#### Fixes
+- Fix the issue that SDWebImagePrefetch in 5.x, will submit all prefetch URLs to manager without any concurrent limit #2631
+- Fix the current transformer cache key generating rules, try to keep the image file extension #2635
+
+#### Project
+- Move some internal classes into private header files, make it easy to maintain the code #2634
+
+## [4.4.6 - 4.4 patch, on Feb 26th, 2019](https://github.com/SDWebImage/SDWebImage/releases/tag/4.4.6)
+See [all tickets marked for the 4.4.6 release](https://github.com/SDWebImage/SDWebImage/milestone/33)
+
+#### Fixes
+- Fix the unused user header search path warning for CocoaPods 1.6.0. #2622
+- Fix that WebP with custom ICC Profile will randomly crash, because `CGColorSpaceCreateWithICCProfile` does not copy the ICC data pointer #2621
+- Fix the issue when WebP contains the ICC Profile with colorSpace other than RGB, which cause the CGImageCreate failed #2627
+
+#### Project
+- Update the libwebp dependency to support using 1.0 version and above #2625
+
+#### Performances
+- Nil imageData before decode process to free memory #2624
+
+## [5.0.0-beta5 - Customizable SDWebImage, on Jan 31st, 2019](https://github.com/rs/SDWebImage/releases/tag/5.0.0-beta5)
+See [all tickets marked for the 5.0.0-beta5 release](https://github.com/rs/SDWebImage/milestone/32)
+
+#### Fixes
+- Fix encoding options does not works #2602
+- Remove unnecessary CGImage check when encode first frame #2609
+
+## [4.4.5 - 4.4 patch, on Jan 31st, 2019](https://github.com/SDWebImage/SDWebImage/releases/tag/4.4.5)
+See [all tickets marked for the 4.4.5 release](https://github.com/SDWebImage/SDWebImage/milestone/31)
+
+#### Fixes
+- Revert the modular framework, try to fix some user's install issue when using SDWebImage in prefix header #2604
+- Fix wrong decompression scale calculation #2608
+- Fix shouldDecode check when image format is GIF #2606
+- Fix modify data pointer if webp image scaled down #2607
+
+## [5.0.0-beta4 - Customizable SDWebImage, on Jan 26th, 2019](https://github.com/rs/SDWebImage/releases/tag/5.0.0-beta4)
+See [all tickets marked for the 5.0.0 release](https://github.com/rs/SDWebImage/milestone/15)
+
+#### Features
+- Expose the graphics helper method for coder plugin author and fix scale issue #2523
+
+#### Performances
+- Decrease animated decode times when cache enable #2468
+- Remove kCGImageSourceShouldCache option when creating image source #2472
+- Add autoreleasepool to release autorelease objects in advance when using GCD #2474
+
+#### Fixes
+- Add protect when custom animated image class image data is nil during progressive animation check #2466
+- Fix background download #2500
+
+#### Project
+- Merged targets + MapKit dedicated target for Carthage installs #2476. Carthage user now does not enable MapKit support by default.
+- Upgrade Xcode 10 + using xcconfig for project settings #2494
+
+#### Notable Changes (from beta3)
+
+Behavior:
+
+- Move webp component (and libwebp dependency) to SDWebImage/SDWebImageWebPCoder #2469. Any user who use WebP in 5.0.0 should add [SDWebImageWebPCoder](https://github.com/SDWebImage/SDWebImageWebPCoder) to your Podfile or Cartfile instead.
+- Refactory cache path about namespace && final cache directory #2535. Now the default disk cache path was moved to suitable path with the namespace.
+- Use the memory bytes size, instead of pixel size to calculate the memory cost function #2568. Now the memory cost function use bytes size instead of pixels count.
+
+Swift Only:
+
+- Fix the accident changes of Swift API naming for `sd_imageDataAsFormat:` #2517
+
+You can always check [5.0 migration guide](https://github.com/SDWebImage/SDWebImage/wiki/5.0-Migration-guide) for the latest information for these changes.
+
+## [5.0.0-beta3 - Customizable SDWebImage, on Aug 30th, 2018](https://github.com/rs/SDWebImage/releases/tag/5.0.0-beta3)
+See [all tickets marked for the 5.0.0 release](https://github.com/rs/SDWebImage/milestone/15)
+
+#### Features
+- Minimum progress interval config for `SDWebImageDownloader` #2415 #2437 1d8454d
+- Feature disk cache migration from 4.x #2417 #2433
+- Add `SDImageFormatHEIF` represent `mif1` && `msf1` brands #2423 (imported from 4.4.3)
+- Add default `HTTP User-Agent` for specific system #2409 (imported from 4.4.3)
+- Replace `valueForKey` with `objectForKey` when access NSDictionary #2399
+- Improved unit tests #2438 #2434
+- Enhanced contributing guide #2416
+- Adopt all the protocol APIs which contains getter value to use property instead, to make the API easy to use or Swift user #2452
+- Remove `sd_setAnimationImagesWithURLs` API, because its cause ambiguity, behave not consistently and have rare use case #2459
+- Improved `SDAnimatedImage` protocol with `initWithData:scale:options:` #2453
+- Extra args for `SDSetImageBlock` (added `cacheType` and `imageURL`) #2449
+
+#### Fixes
+- Fix that using `NS_TYPED_ENUM` on `SDImageFormat` cause the existing Swift API (`sd_UTTypeFromImageFormat`) naming changed #2413
+- Fix that downloader options about image decoding is not correctly set #2414
+- Make download receive response notification only dispatch to specific observer #2426
+- Fix a race condition during progressive animation load in `SDAnimatedImageView` #2435
+- Fix the bug that `SDWebImageContextCacheKeyFilter` wrongly be used as cache serializer and cause crash #2451
+- Fix resource key invalid when clean cached disk file #2462
+- Add no expiration file support of disk cache #2461
+
+## [5.0.0-beta2 - Customizable SDWebImage, on Jul 31st, 2018](https://github.com/rs/SDWebImage/releases/tag/5.0.0-beta2)
+See [all tickets marked for the 5.0.0 release](https://github.com/rs/SDWebImage/milestone/15)
+
+#### Features
+- Add `SDImageCoderWebImageContext` coder option, which allow custom coder plugin, to receive the context option from top-level API #2405
+- Updated all existing diagrams for 5.0 release + added new ones (small detailed diagrams for the most important components) #2407
+
+#### Fixes
+- Fix nullable key for `sd_imageLoadOperationForKey` #2389
+- Replace `__bridge_transfer` with `__bridge` when convert from `CFStringRef` to `NSString` #2392
+- Rename `sd_UTTypeFromSDImageFormat` to `sd_UTTypeFromImageFormat` #2395
+- Change `SDImageFormat` to use `NS_TYPED_EXTENSIBLE_ENUM` instead of fixed enum, to allow custom coder plugins to extend it #2400
+
+## [4.4.4 - 4.4 patch, on Jan 26th, 2019](https://github.com/SDWebImage/SDWebImage/releases/tag/4.4.4)
+See [all tickets marked for the 4.4.4 release](https://github.com/SDWebImage/SDWebImage/milestone/29)
+
+#### Fixes
+- Fix memory cache image cost miscalculation for 4.x #2486
+- Fix background download for 4.x #2570
+- Fix race condition for creation of download operation when isCancelled is YES but isFinished is NO #2574
+- Fix the current image cost (pixels) for FLAnimatedImage #2558
+- Fix the FLAnimatedImage compatible code issue by introduce a private API #2588
+- Fix that WebP image with ICC Profile does not show color correctly, should use the profile colorspace instead of device colorspace #2585
+- Fix potential memory leaks for ICCP && optimize ICCP handler #2596
+- Fix that WebP decoder in master branch, does not consider the global `shouldDecompressImages` config and always do pre-draw for static WebP images #2592
+- Fix rare crash when NSMapTable empty keys #2556
+- Retain operation when post download related notifications (Hopefully fix, but if you face crash, please open a issue) #2576
+
+#### Performances
+- Prioritize SDWebImageDownloaderHighPriority if operation already exists #2575
+
+#### Project
+- Let SD can be imported using static library by CocoaPods using `DEFINES_MODULE` #2549
+
+## [4.4.3 - 4.4 patch, on Nov 25th, 2018](https://github.com/SDWebImage/SDWebImage/releases/tag/4.4.3)
+See [all tickets marked for the 4.4.3 release](https://github.com/SDWebImage/SDWebImage/milestone/28)
+
+#### Fixes
+- Revert the hack code for `FLAnimatedImage`, because of the `FLAnimatedImage` initializer method blocks the main queue #2441
+- Fix extention long length of file name #2516 6c6d848
+- Fix resource key invalid when clean cached disk file #2463
+- Fix the test case `testFLAnimatedImageViewSetImageWithURL` because of remote resource is not available #2450
+- Add default `HTTP User-Agent` for specific system #2409
+- Add `SDImageFormatHEIF` represent `mif1` && `msf1` brands #2423
+- remove `addProgressCallback`, add `createDownloaderOperationWithUrl` #2336
+- Fix the bug when `FLAnimatedImageView` firstly show one EXIF rotation JPEG `UIImage`, later animated GIF `FLAnimatedImage` will also be rotated #2406
+- Replace `SDWebImageDownloaderOperation` with `NSOperation<SDWebImageDownloaderOperationInterface>` to make generic #2397
+- Fix wrong image cache type when disk and memory cache missed #2529
+- Fix FLAnimatedImage version check issue for custom property `optimalFrameCacheSize` && `predrawingEnabled` #2543
+
+#### Performances
+- Add autoreleasepool to release autorelease objects in advance when using GCD for 4.x #2475
+- Optimize when scale = 1 #2520
+
+#### Docs
+- Updated URLs after project was transfered to [SDWebImage organization](https://github.com/SDWebImage) #2510 f9d05d9
+- Tidy up spacing for `README.md` #2511
+- Remove versioneye from README #2424
+
+## [4.4.2 - 4.4 patch, on July 18th, 2018](https://github.com/SDWebImage/SDWebImage/releases/tag/4.4.2)
+See [all tickets marked for the 4.4.2 release](https://github.com/SDWebImage/SDWebImage/milestone/27)
 
 #### Features
 - Ability to change the clear cache option `SDImageCacheConfig.diskCacheExpireType` #2357
@@ -14,8 +1451,60 @@ See [all tickets marked for the 4.4.2 release](https://github.com/rs/SDWebImage/
 - Check for nullable key when cancel image load operation #2386
 - Replace `__bridge_transfer` with `__bridge` when convert from `CFStringRef` to `NSString` #2394
 
-## [4.4.1 - 4.4 patch, on June 7th, 2018](https://github.com/rs/SDWebImage/releases/tag/4.4.1)
-See [all tickets marked for the 4.4.1 release](https://github.com/rs/SDWebImage/milestone/26)
+## [5.0.0-beta - Customizable SDWebImage, on Jul 17th, 2018](https://github.com/rs/SDWebImage/releases/tag/5.0.0-beta)
+See [all tickets marked for the 5.0.0 release](https://github.com/rs/SDWebImage/milestone/15)
+
+#### Infrastructure
+- the new requirements are **iOS 8.0+** and **macOS 10.10+** #2147
+- **Xcode 9+**
+
+#### Backwards incompatible changes
+
+See the [5.0 Migration Guide](https://raw.githubusercontent.com/rs/SDWebImage/master/Docs/SDWebImage-5.0-Migration-guide.md) for a list of comprehensive changes and the way to update your code
+
+#### Features
+- Introduce `SDAnimatedImageView`, `SDAnimatedImage` and refactor the way we handle animated images #2140
+- Added APNG support via dedicated coder `SDImageAPNGCoder` #2149
+- Refactored `SDWebImageDownloader` configs, separated them into a dedicated `SDWebImageDownloaderConfig` object #2263
+- Refactored the way we work with the scale factor #2266
+- Created request and response modifier #2261
+- Refactor Cache Path API #2276
+- Refactor custom cache serializer & headers filter for request level #2280
+- Refactor cache - Support custom memory cache & disk cache #2282
+- Refactor cache - Support custom web cache #2278
+- Refactor - custom image loader - Supports loader protocol #2256
+- Use `SDWebImageAvoidDecodeImage` to allow user to control force decode feature for individual image request #2283
+
+- `SDImageCache` supports disk cache writing options. See `SDImageCacheConfig diskCacheWritingOptions` #2148
+- `SDImageCache` now uses `NSData writeToFile:options:error` instead of `NSFileManager createFileAtPath:contents:attributes` #2148
+- Moved `SDImageCache maxMemoryCost` and `SDImageCache maxMemoryCountLimit` to `SDImageCacheConfig` #2151
+- Added `SDImageCache diskImageDataExistsWithKey:` synchronous method #2151
+- Moved `UIImage sd_imageLoopCount` and `UIImage isGIF` (and renamed to `sd_isAnimated`) to `UIImage+Metadata` category, removed the outdated methods #2152
+- Move context and other type definitions to a separate header (`SDWebImageDefine`) to allow to be included without dependency #2188
+- Pass `context` arg from the top level APIs to the bottom level APIs to allow specify logic in the future #2189 d6a3e2c c24c3d3
+- Refactor the image indicator by creating `SDWebImageIndicator` and `SDWebImageProgressIndicator` protocols and two concrete classes that implement activity and progress indicators for both UIKit and AppKit #2185 46b62cf
+- Refactor the implementation of `SDWebImagePrefetcher` so it behaves more like a "shared instance" object, similar to other platform classes. Each instance will manage its own list of urls. #2191 1efc247 92f3d2c bc164d6
+- Refactored and enhanced the way we allow image transformations. Switched from a single delegate method to composition of `SDImageTransformer` #2219
+- API style refactoring - #2250
+  - Use property instead of setters and getters to make the property available in Swift
+  - Use class property with the correct name instead of `+(instanceType)sharedInstance` in singleton to make it more easy to use in Swift. The generated interface should be simple `open class var shared { get }`
+  - Add all nullability annotation to avoid any `AnyObject!` implicitly unwrapped optionals (Except that `null_resettable`)
+  - Add all Core Foundation Ownership using `CF_RETURNS_RETAINED` for
+    Get Rule and `CF_RETURNS_NOT_RETAINED` for Create Rule to avoid any `Unmanaged` CF value
+  - Change all key for Dictionary with `NS_STRING_ENUM` to make it easy to use in Swift with dot syntax
+  - Change all global value type which represent enum with `NS_TYPED_ENUM` to make it easy to use in Swift with dot syntax
+- Remove the extra calculation of image orientation for ImageIO coder & Fix macOS image orientation #2271
+- Added `SDWebImageError` (defined as `NS_ERROR_ENUM`) to group all our errors together #2290
+- Added tests for macOS
+- Add the `SDWebImageContextStoreCacheType` context option to specify target cache type when the image is downloaded by manager and will store to cache #2360
+- Feature watchOS `WKInterfaceImage` with `sd_setImageWithURL` #2331
+- Add options to specify query cache sync/async behavior #2312
+
+#### Fixes
+- `SDWebImageManager loadImageWithURL:options:progress:completed:` changed the `completed` param requirement from `nullable` to `nonnull` #2164
+
+## [4.4.1 - 4.4 patch, on June 7th, 2018](https://github.com/SDWebImage/SDWebImage/releases/tag/4.4.1)
+See [all tickets marked for the 4.4.1 release](https://github.com/SDWebImage/SDWebImage/milestone/26)
 	
 #### Fixes
 - Coder
@@ -23,8 +1512,8 @@ See [all tickets marked for the 4.4.1 release](https://github.com/rs/SDWebImage/
 - Downloader
 	- Fix that the downloader operation may not call the completion block when requesting the same image url in race condition #2346 #2344
 
-## [4.4.0 - watchOS View Category, on May 31st, 2018](https://github.com/rs/SDWebImage/releases/tag/4.4.0)
-See [all tickets marked for the 4.4.0 release](https://github.com/rs/SDWebImage/milestone/25)
+## [4.4.0 - watchOS View Category, on May 31st, 2018](https://github.com/SDWebImage/SDWebImage/releases/tag/4.4.0)
+See [all tickets marked for the 4.4.0 release](https://github.com/SDWebImage/SDWebImage/milestone/25)
 
 #### Features
 - View Category
@@ -56,8 +1545,8 @@ See [all tickets marked for the 4.4.0 release](https://github.com/rs/SDWebImage/
 #### Docs
 - Fix function storeImageDataToDisk description #2301
 
-## [4.3.3 - Cache Serializer, on Mar 12th, 2018](https://github.com/rs/SDWebImage/releases/tag/4.3.3)
-See [all tickets marked for the 4.3.3 release](https://github.com/rs/SDWebImage/milestone/24)
+## [4.3.3 - Cache Serializer, on Mar 12th, 2018](https://github.com/SDWebImage/SDWebImage/releases/tag/4.3.3)
+See [all tickets marked for the 4.3.3 release](https://github.com/SDWebImage/SDWebImage/milestone/24)
 
 #### Features
 - Manager
@@ -69,8 +1558,8 @@ See [all tickets marked for the 4.3.3 release](https://github.com/rs/SDWebImage/
 	- Enable CLANG\_WARN\_OBJC\_IMPLICIT\_RETAIN\_SELF and fix warning #2242
 
 
-## [4.3.2 - 4.3 Patch, on Feb 28th, 2018](https://github.com/rs/SDWebImage/releases/tag/4.3.2)
-See [all tickets marked for the 4.3.2 release](https://github.com/rs/SDWebImage/milestone/23)
+## [4.3.2 - 4.3 Patch, on Feb 28th, 2018](https://github.com/SDWebImage/SDWebImage/releases/tag/4.3.2)
+See [all tickets marked for the 4.3.2 release](https://github.com/SDWebImage/SDWebImage/milestone/23)
 
 #### Fixes
 - Download Operation
@@ -80,8 +1569,8 @@ See [all tickets marked for the 4.3.2 release](https://github.com/rs/SDWebImage/
 - Downloader
 	- Follow Apple's doc, add NSOperation only after all configuration done #2232
 
-## [4.3.1 - 4.3 Patch, on Feb 25th, 2018](https://github.com/rs/SDWebImage/releases/tag/4.3.1)
-See [all tickets marked for the 4.3.1 release](https://github.com/rs/SDWebImage/milestone/22)
+## [4.3.1 - 4.3 Patch, on Feb 25th, 2018](https://github.com/SDWebImage/SDWebImage/releases/tag/4.3.1)
+See [all tickets marked for the 4.3.1 release](https://github.com/SDWebImage/SDWebImage/milestone/22)
 
 #### Fixes
 - Cache
@@ -106,8 +1595,8 @@ See [all tickets marked for the 4.3.1 release](https://github.com/rs/SDWebImage/
 	- Fix CLANG\_WARN\_OBJC\_IMPLICIT\_RETAIN\_SELF warning #2225 
 
 
-## [4.3.0 - Image Progress & Transition, on Jan 31th, 2018](https://github.com/rs/SDWebImage/releases/tag/4.3.0)
-See [all tickets marked for the 4.3.0 release](https://github.com/rs/SDWebImage/milestone/21)
+## [4.3.0 - Image Progress & Transition, on Jan 31th, 2018](https://github.com/SDWebImage/SDWebImage/releases/tag/4.3.0)
+See [all tickets marked for the 4.3.0 release](https://github.com/SDWebImage/SDWebImage/milestone/21)
 
 #### Features
 - View Category
@@ -151,8 +1640,8 @@ See [all tickets marked for the 4.3.0 release](https://github.com/rs/SDWebImage/
 - Project
 	- Update the spec file to define the dependency version for libwebp #2169
 
-## [4.2.3 - 4.2 Patch, on Nov 30th, 2017](https://github.com/rs/SDWebImage/releases/tag/4.2.3)
-See [all tickets marked for the 4.2.3 release](https://github.com/rs/SDWebImage/milestone/20)
+## [4.2.3 - 4.2 Patch, on Nov 30th, 2017](https://github.com/SDWebImage/SDWebImage/releases/tag/4.2.3)
+See [all tickets marked for the 4.2.3 release](https://github.com/SDWebImage/SDWebImage/milestone/20)
 
 #### Features
 - Add a public API to allow user to invalidate URLSession used in SDWebImageDownloader to avoid memory leak on non-singleton instance #2116
@@ -170,8 +1659,8 @@ See [all tickets marked for the 4.2.3 release](https://github.com/rs/SDWebImage/
 - Adopt the current requirement, change ImageIO coder's canDecodeFromHEIC to actual implementation #2146 #2138
 - When store image with no data for SDImageCache, check whether it contains alpha to use PNG or JPEG format #2136
 
-## [4.2.2 - 4.2 Patch, on Nov 7th, 2017](https://github.com/rs/SDWebImage/releases/tag/4.2.2)
-See [all tickets marked for the 4.2.2 release](https://github.com/rs/SDWebImage/milestone/19)
+## [4.2.2 - 4.2 Patch, on Nov 7th, 2017](https://github.com/SDWebImage/SDWebImage/releases/tag/4.2.2)
+See [all tickets marked for the 4.2.2 release](https://github.com/SDWebImage/SDWebImage/milestone/19)
 
 #### Features
 - Update our iOS demo to modern way, add a `UIProgressView` to show image download progress #2096
@@ -180,8 +1669,8 @@ See [all tickets marked for the 4.2.2 release](https://github.com/rs/SDWebImage/
 - Fix that completion block and set image block are called asynchronously for `UIView+WebCache` #2093 #2097 #2092
 - Fix WebP progressive decoding may do extra calculate #2095
 
-## [4.2.1 - 4.2 Patch, on Oct 31st, 2017](https://github.com/rs/SDWebImage/releases/tag/4.2.1)
-See [all tickets marked for the 4.2.1 release](https://github.com/rs/SDWebImage/milestone/18)
+## [4.2.1 - 4.2 Patch, on Oct 31st, 2017](https://github.com/SDWebImage/SDWebImage/releases/tag/4.2.1)
+See [all tickets marked for the 4.2.1 release](https://github.com/SDWebImage/SDWebImage/milestone/18)
 
 #### Features
 - Feature refactor built-in coders and support animated webp on macOS #2082 (reusable code into `SDWebImageCoderHelper`; `SDWebImageFrame` abstracts animated images frames)
@@ -189,8 +1678,8 @@ See [all tickets marked for the 4.2.1 release](https://github.com/rs/SDWebImage/
 #### Fixes
 - Fixed EXIF orientation method will crash on iOS 7 because it’s an iOS 8 above API #2082
 
-## [4.2.0 - Pluginable coders, on Oct 30th, 2017](https://github.com/rs/SDWebImage/releases/tag/4.2.0)
-See [all tickets marked for the 4.2.0 release](https://github.com/rs/SDWebImage/milestone/16)
+## [4.2.0 - Pluginable coders, on Oct 30th, 2017](https://github.com/SDWebImage/SDWebImage/releases/tag/4.2.0)
+See [all tickets marked for the 4.2.0 release](https://github.com/SDWebImage/SDWebImage/milestone/16)
 
 #### Features
 - Refactor decoding code and provide decoding plugin #1991
@@ -214,8 +1703,8 @@ See [all tickets marked for the 4.2.0 release](https://github.com/rs/SDWebImage/
 #### Docs
 - Updated diagrams
 
-## [4.1.2 - 4.1 patch, on Oct 9th, 2017](https://github.com/rs/SDWebImage/releases/tag/4.1.2)
-See [all tickets marked for the 4.1.2 release](https://github.com/rs/SDWebImage/milestone/17)
+## [4.1.2 - 4.1 patch, on Oct 9th, 2017](https://github.com/SDWebImage/SDWebImage/releases/tag/4.1.2)
+See [all tickets marked for the 4.1.2 release](https://github.com/SDWebImage/SDWebImage/milestone/17)
 
 #### Fixes
 
@@ -223,8 +1712,8 @@ See [all tickets marked for the 4.1.2 release](https://github.com/rs/SDWebImage/
 - Static `WebP` decoding little enhancement. Do not need create `WebP` iterator for static images #2050
 - Change `finished` check from `equal` to `equal or greater than` to protect accident condition #2051
 
-## [4.1.1 - 4.1 patch, on Oct 6th, 2017](https://github.com/rs/SDWebImage/releases/tag/4.1.1)
-See [all tickets marked for the 4.1.1 release](https://github.com/rs/SDWebImage/milestone/14)
+## [4.1.1 - 4.1 patch, on Oct 6th, 2017](https://github.com/SDWebImage/SDWebImage/releases/tag/4.1.1)
+See [all tickets marked for the 4.1.1 release](https://github.com/SDWebImage/SDWebImage/milestone/14)
 
 #### Fixes
 
@@ -251,8 +1740,8 @@ See [all tickets marked for the 4.1.1 release](https://github.com/rs/SDWebImage/
 
 - Updated *Manual Installation* section #2030 fixes #2012
 
-## [4.1.0 - Swift API cleanup, on Jul 31st, 2017](https://github.com/rs/SDWebImage/releases/tag/4.1.0)
-See [all tickets marked for the 4.1.0 release](https://github.com/rs/SDWebImage/milestone/13)
+## [4.1.0 - Swift API cleanup, on Jul 31st, 2017](https://github.com/SDWebImage/SDWebImage/releases/tag/4.1.0)
+See [all tickets marked for the 4.1.0 release](https://github.com/SDWebImage/SDWebImage/milestone/13)
 
 #### Features
 
@@ -281,14 +1770,14 @@ See [all tickets marked for the 4.1.0 release](https://github.com/rs/SDWebImage/
 
 - #1778 #1779 #1788 #1799 b1c3bb7 (replaces #1806) 0df32ea #1847 5eb83c3 (replaces #1828) #1946 #1966
 
-## [4.0.0 - New platforms (Mac OS X and watchOS) + refactoring, on Jan 28th, 2017](https://github.com/rs/SDWebImage/releases/tag/4.0.0)
+## [4.0.0 - New platforms (Mac OS X and watchOS) + refactoring, on Jan 28th, 2017](https://github.com/SDWebImage/SDWebImage/releases/tag/4.0.0)
 
-See [all tickets marked for the 4.0.0 release](https://github.com/rs/SDWebImage/milestone/3)
+See [all tickets marked for the 4.0.0 release](https://github.com/SDWebImage/SDWebImage/milestone/3)
 Versions 4.0.0-beta and 4.0.0-beta 2 list all the changes. 
 
-## [4.0.0 beta 2 - New platforms (Mac OS X and watchOS) + refactoring, on Oct 6th, 2016](https://github.com/rs/SDWebImage/releases/tag/4.0.0-beta2)
+## [4.0.0 beta 2 - New platforms (Mac OS X and watchOS) + refactoring, on Oct 6th, 2016](https://github.com/SDWebImage/SDWebImage/releases/tag/4.0.0-beta2)
 
-See [all tickets marked for the 4.0.0 release](https://github.com/rs/SDWebImage/milestone/3)
+See [all tickets marked for the 4.0.0 release](https://github.com/SDWebImage/SDWebImage/milestone/3)
 
 #### Features
 
@@ -298,9 +1787,9 @@ See [all tickets marked for the 4.0.0 release](https://github.com/rs/SDWebImage/
 
 - Fixed #1668 CGContextDrawImage: invalid context 0x0 - b366d84
 
-## [4.0.0 beta - New platforms (Mac OS X and watchOS) + refactoring, on Oct 5th, 2016](https://github.com/rs/SDWebImage/releases/tag/4.0.0-beta)
+## [4.0.0 beta - New platforms (Mac OS X and watchOS) + refactoring, on Oct 5th, 2016](https://github.com/SDWebImage/SDWebImage/releases/tag/4.0.0-beta)
 
-See [all tickets marked for the 4.0.0 release](https://github.com/rs/SDWebImage/milestone/3)
+See [all tickets marked for the 4.0.0 release](https://github.com/SDWebImage/SDWebImage/milestone/3)
 
 #### Infrastructure:
 
@@ -318,7 +1807,7 @@ See [all tickets marked for the 4.0.0 release](https://github.com/rs/SDWebImage/
     - `SDWebImage TV Demo`
     - `SDWebImage Watch Demo`
 - bumped `libwep` version to `0.5.1`
-- improved unit testing code coverage (*35%* -> **77%**) and integrated [CodeCov](https://codecov.io/gh/rs/SDWebImage)
+- improved unit testing code coverage (*35%* -> **77%**) and integrated [CodeCov](https://codecov.io/gh/SDWebImage/SDWebImage)
 
 #### Backwards incompatible changes
 
@@ -400,20 +1889,20 @@ See [all tickets marked for the 4.0.0 release](https://github.com/rs/SDWebImage/
 - Fixed #1089 by updating the docs on the calling queue for the `progressBlock` (background queue)
 - Fixed a compilation issue on `FLAnimatedImageView+WebCache` - #1687
 
-## [3.8.2 Patch release for 3.8.0 on Sep 5th, 2016](https://github.com/rs/SDWebImage/releases/tag/3.8.2)
+## [3.8.2 Patch release for 3.8.0 on Sep 5th, 2016](https://github.com/SDWebImage/SDWebImage/releases/tag/3.8.2)
 
 #### Fixes:
 
 - Fixed #1608 #1623 #1644 Crash in `[NSURLCache cachedResponseForRequest:]` -  the fix is actually avoiding to access `NSURLCache` which appears to generate a race condition. We only call it if necesarry (`SDWebImageRefreshCached` is used and the image cannot be cached by the system when it's too big or behind authentication)
 
-## [3.8.1 Patch release for 3.8.0 on Jun 7th, 2016](https://github.com/rs/SDWebImage/releases/tag/3.8.1)
+## [3.8.1 Patch release for 3.8.0 on Jun 7th, 2016](https://github.com/SDWebImage/SDWebImage/releases/tag/3.8.1)
 
 #### Fixes:
 
 - SDWebImage 3.8.0 get wrong image #1589 - the issue was caused by the changes in 3.8.0 (Removed the URL query params from the filename (key) fb0cdb6d 1bf62d4 #1584 - fixes #1433 #1553 #1583 #1585) - Reverted. 
 - Note: The solution for those issues (i.e. #1433 #1553) is to set the `SDWebImageManager` `cacheKeyFilter` block and do their own calculations there.
 
-## [3.8.0 Minor release - Replaces NSURLConnection (deprecated) with NSURLSession - on Jun 6th, 2016](https://github.com/rs/SDWebImage/releases/tag/3.8.0)
+## [3.8.0 Minor release - Replaces NSURLConnection (deprecated) with NSURLSession - on Jun 6th, 2016](https://github.com/SDWebImage/SDWebImage/releases/tag/3.8.0)
 
 #### Infrastructure:
 
@@ -430,7 +1919,7 @@ See [all tickets marked for the 4.0.0 release](https://github.com/rs/SDWebImage/
 - Fixed the WebP build with the official 1.0.0 CocoaPods release f1a471e - fixes #1444
 - Updated doc: `removeImageForKey:` not synchronous e6e5c51 - fixes #1379 #1415
 
-## [3.7.6 Patch release for 3.7.0 on May 8th, 2016](https://github.com/rs/SDWebImage/releases/tag/3.7.6)
+## [3.7.6 Patch release for 3.7.0 on May 8th, 2016](https://github.com/SDWebImage/SDWebImage/releases/tag/3.7.6)
 
 #### Infrastructure:
 - Changed the **libwebp git url** so that people from China can access it - #1390 (from `https://chromium.googlesource.com/webm/libwebp` to `https://github.com/webmproject/libwebp`)
@@ -450,11 +1939,11 @@ See [all tickets marked for the 4.0.0 release](https://github.com/rs/SDWebImage/
 - Protect against malformed frame for GIFs - #1447
 - updated doc: #1462 #1466 #1486 #1532 #1461 
 
-## [3.7.5 Patch release for 3.7.0 on Jan 21st, 2016](https://github.com/rs/SDWebImage/releases/tag/3.7.5)
+## [3.7.5 Patch release for 3.7.0 on Jan 21st, 2016](https://github.com/SDWebImage/SDWebImage/releases/tag/3.7.5)
 - fixed #1425 and #1426 - Continuation of Fix #1366, addresses #1350 and reverts a part of #1221 - from commit 6406d8e, the wrong usage of `dispatch_apply`
 - fixed #1422 - Added a fallback for #976 so that if there are images saved with the old format (no extension), they can still be loaded
 
-## [3.7.4 Patch release for 3.7.0 with tvOS support on Jan 8th, 2016](https://github.com/rs/SDWebImage/releases/tag/3.7.4)
+## [3.7.4 Patch release for 3.7.0 with tvOS support on Jan 8th, 2016](https://github.com/SDWebImage/SDWebImage/releases/tag/3.7.4)
 
 #### Updates
 - bumped `libwep` version to `0.4.4`
@@ -491,134 +1980,134 @@ See [all tickets marked for the 4.0.0 release](https://github.com/rs/SDWebImage/
 - Remove logging from the image prefetcher - #1276
 - Fix typos #1256 #1257 #1258 #1331 #1290
 
-## [3.7.3 Patch release for 3.7.0 with iOS8+ framework and Carthage on Jun 13th, 2015](https://github.com/rs/SDWebImage/releases/tag/3.7.3)
-
-- Adds support for **iOS 8+ Framework and Carthage** [#1071](https://github.com/rs/SDWebImage/pull/1071) [#1081](https://github.com/rs/SDWebImage/pull/1081) [#1101](https://github.com/rs/SDWebImage/pull/1101) 
-
-- [Refactor] Use `NSMutableSet` for failed URLs' storage instead of array [#1076](https://github.com/rs/SDWebImage/pull/1076) 
-- Make a constant for the error domain [#1011](https://github.com/rs/SDWebImage/pull/1011) 
-- Improve operation behavior [#988](https://github.com/rs/SDWebImage/pull/988) 
-- Bug fix: `Collection <__NSArrayM: > was mutated while being enumerated` [#985](https://github.com/rs/SDWebImage/pull/985) 
-- added `SDWebImageAvoidAutoSetImage` option to avoid automatic image addition in `UIImageView` and let developer to do it himself [#1188](https://github.com/rs/SDWebImage/pull/1188) 
-- Added support for custom disk cache folder with fall back for caches directory [#1153](https://github.com/rs/SDWebImage/pull/1153) 
-- Added some files to the workspace so they are easier to edit [8431481](https://github.com/rs/SDWebImage/commit/8431481)
-- Doc update [72ed897](https://github.com/rs/SDWebImage/commit/72ed897) [7f99c01](https://github.com/rs/SDWebImage/commit/7f99c01) [#1016](https://github.com/rs/SDWebImage/pull/1016) [#1038](https://github.com/rs/SDWebImage/pull/1038) [#1045](https://github.com/rs/SDWebImage/pull/1045)
-- [Memory Issue] Clear `SDWebImagePrefetcher` `progressBlock` when it has completed [#1017](https://github.com/rs/SDWebImage/pull/1017) 
-- avoid warning `<Error>: ImageIO: CGImageSourceCreateWithData data parameter is nil` if `imageData` is nil [88ee3c6](https://github.com/rs/SDWebImage/commit/88ee3c6) [#1018](https://github.com/rs/SDWebImage/pull/1018) 
-- allow override `diskCachePath` [#1041](https://github.com/rs/SDWebImage/pull/1041) 
-- Use `__typeof(self)` when assigning `weak` reference for block [#1054](https://github.com/rs/SDWebImage/pull/1054) 
-- [Refactor] Implement cache cost calculation as a inline function [#1075](https://github.com/rs/SDWebImage/pull/1075) 
-- @3x support [9620fff](https://github.com/rs/SDWebImage/commit/9620fff) [#1005](https://github.com/rs/SDWebImage/pull/1005) 
-- Fix parenthesis to avoid crashes [#1104](https://github.com/rs/SDWebImage/pull/1104) 
-- Add `NSCache` countLimit property [#1140](https://github.com/rs/SDWebImage/pull/1140) 
-- `failedURLs` can be removed at the appropriate time [#1111](https://github.com/rs/SDWebImage/pull/1111) 
-- Purge `NSCache` on system memory notifications [#1143](https://github.com/rs/SDWebImage/pull/1143) 
-- Determines at runtime is `UIApplication` is available as per [#1082](https://github.com/rs/SDWebImage/issues/1082) [#1085](https://github.com/rs/SDWebImage/pull/1085) 
-- Fixes http://git.chromium.org/webm/libwebp.git/info/refs not valid [#1175](https://github.com/rs/SDWebImage/pull/1175) + Reverted [#1193](https://github.com/rs/SDWebImage/pull/1193) + [#1177](https://github.com/rs/SDWebImage/pull/1177) 
-- 404 image url was causing the test to fail [0e761f4](https://github.com/rs/SDWebImage/commit/0e761f4)
-- Fix for transparency being lost in transformed images. [#1121](https://github.com/rs/SDWebImage/pull/1121) 
-- Add handling for additional error codes that shouldn't be considered a permanent failure [#1159](https://github.com/rs/SDWebImage/pull/1159) 
-- add webp accepted content type only if `WebP` enabled [#1178](https://github.com/rs/SDWebImage/pull/1178) 
-- fix `ImageIO: CGImageSourceCreateWithData` data parameter is nil [#1167](https://github.com/rs/SDWebImage/pull/1167) 
-- Applied patch for issue [#1074](https://github.com/rs/SDWebImage/issues/1074) SDWebImage residing in swift module breaks the debugger [#1138](https://github.com/rs/SDWebImage/pull/1138)
-- Fixed URLs with trailing parameters get assigned an incorrect image scale value [#1157](https://github.com/rs/SDWebImage/issues/1157) [#1158](https://github.com/rs/SDWebImage/pull/1158) 
-- Add newline to avoid compiler warning in `WebImage.h` [#1199](https://github.com/rs/SDWebImage/pull/1199) 
-
-## [3.7.2 Updated patch release for 3.7.0 on Mar 17th, 2015](https://github.com/rs/SDWebImage/releases/tag/3.7.2)
+## [3.7.3 Patch release for 3.7.0 with iOS8+ framework and Carthage on Jun 13th, 2015](https://github.com/SDWebImage/SDWebImage/releases/tag/3.7.3)
+
+- Adds support for **iOS 8+ Framework and Carthage** [#1071](https://github.com/SDWebImage/SDWebImage/pull/1071) [#1081](https://github.com/SDWebImage/SDWebImage/pull/1081) [#1101](https://github.com/SDWebImage/SDWebImage/pull/1101) 
+
+- [Refactor] Use `NSMutableSet` for failed URLs' storage instead of array [#1076](https://github.com/SDWebImage/SDWebImage/pull/1076) 
+- Make a constant for the error domain [#1011](https://github.com/SDWebImage/SDWebImage/pull/1011) 
+- Improve operation behavior [#988](https://github.com/SDWebImage/SDWebImage/pull/988) 
+- Bug fix: `Collection <__NSArrayM: > was mutated while being enumerated` [#985](https://github.com/SDWebImage/SDWebImage/pull/985) 
+- added `SDWebImageAvoidAutoSetImage` option to avoid automatic image addition in `UIImageView` and let developer to do it himself [#1188](https://github.com/SDWebImage/SDWebImage/pull/1188) 
+- Added support for custom disk cache folder with fall back for caches directory [#1153](https://github.com/SDWebImage/SDWebImage/pull/1153) 
+- Added some files to the workspace so they are easier to edit [8431481](https://github.com/SDWebImage/SDWebImage/commit/8431481)
+- Doc update [72ed897](https://github.com/SDWebImage/SDWebImage/commit/72ed897) [7f99c01](https://github.com/SDWebImage/SDWebImage/commit/7f99c01) [#1016](https://github.com/SDWebImage/SDWebImage/pull/1016) [#1038](https://github.com/SDWebImage/SDWebImage/pull/1038) [#1045](https://github.com/SDWebImage/SDWebImage/pull/1045)
+- [Memory Issue] Clear `SDWebImagePrefetcher` `progressBlock` when it has completed [#1017](https://github.com/SDWebImage/SDWebImage/pull/1017) 
+- avoid warning `<Error>: ImageIO: CGImageSourceCreateWithData data parameter is nil` if `imageData` is nil [88ee3c6](https://github.com/SDWebImage/SDWebImage/commit/88ee3c6) [#1018](https://github.com/SDWebImage/SDWebImage/pull/1018) 
+- allow override `diskCachePath` [#1041](https://github.com/SDWebImage/SDWebImage/pull/1041) 
+- Use `__typeof(self)` when assigning `weak` reference for block [#1054](https://github.com/SDWebImage/SDWebImage/pull/1054) 
+- [Refactor] Implement cache cost calculation as a inline function [#1075](https://github.com/SDWebImage/SDWebImage/pull/1075) 
+- @3x support [9620fff](https://github.com/SDWebImage/SDWebImage/commit/9620fff) [#1005](https://github.com/SDWebImage/SDWebImage/pull/1005) 
+- Fix parenthesis to avoid crashes [#1104](https://github.com/SDWebImage/SDWebImage/pull/1104) 
+- Add `NSCache` countLimit property [#1140](https://github.com/SDWebImage/SDWebImage/pull/1140) 
+- `failedURLs` can be removed at the appropriate time [#1111](https://github.com/SDWebImage/SDWebImage/pull/1111) 
+- Purge `NSCache` on system memory notifications [#1143](https://github.com/SDWebImage/SDWebImage/pull/1143) 
+- Determines at runtime is `UIApplication` is available as per [#1082](https://github.com/SDWebImage/SDWebImage/issues/1082) [#1085](https://github.com/SDWebImage/SDWebImage/pull/1085) 
+- Fixes http://git.chromium.org/webm/libwebp.git/info/refs not valid [#1175](https://github.com/SDWebImage/SDWebImage/pull/1175) + Reverted [#1193](https://github.com/SDWebImage/SDWebImage/pull/1193) + [#1177](https://github.com/SDWebImage/SDWebImage/pull/1177) 
+- 404 image url was causing the test to fail [0e761f4](https://github.com/SDWebImage/SDWebImage/commit/0e761f4)
+- Fix for transparency being lost in transformed images. [#1121](https://github.com/SDWebImage/SDWebImage/pull/1121) 
+- Add handling for additional error codes that shouldn't be considered a permanent failure [#1159](https://github.com/SDWebImage/SDWebImage/pull/1159) 
+- add webp accepted content type only if `WebP` enabled [#1178](https://github.com/SDWebImage/SDWebImage/pull/1178) 
+- fix `ImageIO: CGImageSourceCreateWithData` data parameter is nil [#1167](https://github.com/SDWebImage/SDWebImage/pull/1167) 
+- Applied patch for issue [#1074](https://github.com/SDWebImage/SDWebImage/issues/1074) SDWebImage residing in swift module breaks the debugger [#1138](https://github.com/SDWebImage/SDWebImage/pull/1138)
+- Fixed URLs with trailing parameters get assigned an incorrect image scale value [#1157](https://github.com/SDWebImage/SDWebImage/issues/1157) [#1158](https://github.com/SDWebImage/SDWebImage/pull/1158) 
+- Add newline to avoid compiler warning in `WebImage.h` [#1199](https://github.com/SDWebImage/SDWebImage/pull/1199) 
+
+## [3.7.2 Updated patch release for 3.7.0 on Mar 17th, 2015](https://github.com/SDWebImage/SDWebImage/releases/tag/3.7.2)
 
 #### Updates
 - bumped `libwep` version to `0.4.3`
 
 #### Features:
-- implement `SDWebImageDownloaderAllowInvalidSSLCertificates` option - [#937](https://github.com/rs/SDWebImage/pull/937) 
-- flag to transform animated images (`SDWebImageTransformAnimatedImage`) - [#703](https://github.com/rs/SDWebImage/pull/703) 
-- allows user to override default `SDWebImageDownloaderOperation` - [#876](https://github.com/rs/SDWebImage/pull/876) 
-- adds option to decompress images and select prefetcher queue - [#996](https://github.com/rs/SDWebImage/pull/996)  
+- implement `SDWebImageDownloaderAllowInvalidSSLCertificates` option - [#937](https://github.com/SDWebImage/SDWebImage/pull/937) 
+- flag to transform animated images (`SDWebImageTransformAnimatedImage`) - [#703](https://github.com/SDWebImage/SDWebImage/pull/703) 
+- allows user to override default `SDWebImageDownloaderOperation` - [#876](https://github.com/SDWebImage/SDWebImage/pull/876) 
+- adds option to decompress images and select prefetcher queue - [#996](https://github.com/SDWebImage/SDWebImage/pull/996)  
 
 #### Fixes:
-- fixed [#809](https://github.com/rs/SDWebImage/issues/809) `cancelAll` crash - [#838](https://github.com/rs/SDWebImage/pull/838) 
-- fixed [#900](https://github.com/rs/SDWebImage/issues/900) by adding a new flag `SD_LOG_NONE` that allows silencing the SD logs from the Prefetcher
-- fixed [#895](https://github.com/rs/SDWebImage/issues/895) unsafe setImage in `setImageWithURL:` - [#896](https://github.com/rs/SDWebImage/pull/896) 
-- fix `NSNotificationCenter` dispatch on subthreads - [#987](https://github.com/rs/SDWebImage/pull/987) 
-- fix `SDWebImageDownloader` threading issue - [#104](https://github.com/rs/SDWebImage/pull/104)6 
-- fixed duplicate failed urls are added into `failedURLs` - [#994](https://github.com/rs/SDWebImage/pull/994) 
-- increased default `maxConcurrentOperationCount`, fixes [#527](https://github.com/rs/SDWebImage/issues/527) - [#897](https://github.com/rs/SDWebImage/pull/897) 
-- handle empty urls `NSArray` - [#929](https://github.com/rs/SDWebImage/pull/929) 
-- decoding webp, depends on source image data alpha status - [#936](https://github.com/rs/SDWebImage/pull/936) 
-- fix [#610](https://github.com/rs/SDWebImage/issues/610) display progressive jpeg issue - [#840](https://github.com/rs/SDWebImage/pull/840) 
-- the code from `SDWebImageDownloaderOperation connection:didFailWithError:` should match the code from `connectionDidFinishLoading:`. This fixes [#872](https://github.com/rs/SDWebImage/issues/872) - [7f39e5e](https://github.com/rs/SDWebImage/commit/7f39e5e)
-- `304 - Not Modified` HTTP status code handling - [#942](https://github.com/rs/SDWebImage/pull/942) 
-- cost compute fix - [#941](https://github.com/rs/SDWebImage/pull/941) 
-- initialise `kPNGSignatureData` data - [#981](https://github.com/rs/SDWebImage/pull/981) 
+- fixed [#809](https://github.com/SDWebImage/SDWebImage/issues/809) `cancelAll` crash - [#838](https://github.com/SDWebImage/SDWebImage/pull/838) 
+- fixed [#900](https://github.com/SDWebImage/SDWebImage/issues/900) by adding a new flag `SD_LOG_NONE` that allows silencing the SD logs from the Prefetcher
+- fixed [#895](https://github.com/SDWebImage/SDWebImage/issues/895) unsafe setImage in `setImageWithURL:` - [#896](https://github.com/SDWebImage/SDWebImage/pull/896) 
+- fix `NSNotificationCenter` dispatch on subthreads - [#987](https://github.com/SDWebImage/SDWebImage/pull/987) 
+- fix `SDWebImageDownloader` threading issue - [#104](https://github.com/SDWebImage/SDWebImage/pull/104)6 
+- fixed duplicate failed urls are added into `failedURLs` - [#994](https://github.com/SDWebImage/SDWebImage/pull/994) 
+- increased default `maxConcurrentOperationCount`, fixes [#527](https://github.com/SDWebImage/SDWebImage/issues/527) - [#897](https://github.com/SDWebImage/SDWebImage/pull/897) 
+- handle empty urls `NSArray` - [#929](https://github.com/SDWebImage/SDWebImage/pull/929) 
+- decoding webp, depends on source image data alpha status - [#936](https://github.com/SDWebImage/SDWebImage/pull/936) 
+- fix [#610](https://github.com/SDWebImage/SDWebImage/issues/610) display progressive jpeg issue - [#840](https://github.com/SDWebImage/SDWebImage/pull/840) 
+- the code from `SDWebImageDownloaderOperation connection:didFailWithError:` should match the code from `connectionDidFinishLoading:`. This fixes [#872](https://github.com/SDWebImage/SDWebImage/issues/872) - [7f39e5e](https://github.com/SDWebImage/SDWebImage/commit/7f39e5e)
+- `304 - Not Modified` HTTP status code handling - [#942](https://github.com/SDWebImage/SDWebImage/pull/942) 
+- cost compute fix - [#941](https://github.com/SDWebImage/SDWebImage/pull/941) 
+- initialise `kPNGSignatureData` data - [#981](https://github.com/SDWebImage/SDWebImage/pull/981) 
 
 #### Documentation
 - documentation updated
 
-## [3.7.1 Patch release for 3.7.0 on Jul 23rd, 2014](https://github.com/rs/SDWebImage/releases/tag/3.7.1)
+## [3.7.1 Patch release for 3.7.0 on Jul 23rd, 2014](https://github.com/SDWebImage/SDWebImage/releases/tag/3.7.1)
 
-- fixed `sd_imageOrientationFromImageData:` crash if imageSource is nil - [#819](https://github.com/rs/SDWebImage/pull/819) [#813](https://github.com/rs/SDWebImage/pull/813) [#808](https://github.com/rs/SDWebImage/issues/808) [#828](https://github.com/rs/SDWebImage/issues/828) - temporary fix
-- fixed `SDWebImageCombinedOperation cancel` crash (also visible as `SDWebImageManager cancelAll`) - [28109c4](https://github.com/rs/SDWebImage/commit/28109c4) [#798](https://github.com/rs/SDWebImage/issues/798) [#809](https://github.com/rs/SDWebImage/issues/809) 
-- fixed duplicate symbols when using with webp via pods - [#795](https://github.com/rs/SDWebImage/pull/795) 
-- fixed missing `mark` from `pragma mark` - [#827](https://github.com/rs/SDWebImage/pull/827) 
+- fixed `sd_imageOrientationFromImageData:` crash if imageSource is nil - [#819](https://github.com/SDWebImage/SDWebImage/pull/819) [#813](https://github.com/SDWebImage/SDWebImage/pull/813) [#808](https://github.com/SDWebImage/SDWebImage/issues/808) [#828](https://github.com/SDWebImage/SDWebImage/issues/828) - temporary fix
+- fixed `SDWebImageCombinedOperation cancel` crash (also visible as `SDWebImageManager cancelAll`) - [28109c4](https://github.com/SDWebImage/SDWebImage/commit/28109c4) [#798](https://github.com/SDWebImage/SDWebImage/issues/798) [#809](https://github.com/SDWebImage/SDWebImage/issues/809) 
+- fixed duplicate symbols when using with webp via pods - [#795](https://github.com/SDWebImage/SDWebImage/pull/795) 
+- fixed missing `mark` from `pragma mark` - [#827](https://github.com/SDWebImage/SDWebImage/pull/827) 
 
-## [3.7.0 Xcode6, arm64, highlight UIImageView, imageURL ref, NTLM, ... on Jul 14th, 2014](https://github.com/rs/SDWebImage/releases/tag/3.7.0)
+## [3.7.0 Xcode6, arm64, highlight UIImageView, imageURL ref, NTLM, ... on Jul 14th, 2014](https://github.com/SDWebImage/SDWebImage/releases/tag/3.7.0)
 
 ## Features
-- Add category for imageView's highlighted state `UIImageView+HighlightedWebCache` - [#646](https://github.com/rs/SDWebImage/pull/646) [#765](https://github.com/rs/SDWebImage/pull/765)
-- Keep a reference to the image URL - [#560](https://github.com/rs/SDWebImage/pull/560)
-- Pass imageURL in completedBlock - [#770](https://github.com/rs/SDWebImage/pull/770)
-- Implemented NTLM auth support. Replaced deprecated auth challenge methods from `NSURLConnectionDelegate` - [#711](https://github.com/rs/SDWebImage/pull/711) [50c4d1d](https://github.com/rs/SDWebImage/commit/50c4d1d)
-- Ability to suspend image downloaders `SDWebImageDownloader setSuspended:` - [#734](https://github.com/rs/SDWebImage/pull/734)
-- Delay the loading of the placeholder image until after load - [#701](https://github.com/rs/SDWebImage/pull/701)
-- Ability to save images to cache directly - [#714](https://github.com/rs/SDWebImage/pull/714)
-- Support for image orientation - [#764](https://github.com/rs/SDWebImage/pull/764)
-- Added async `SDImageCache removeImageForKey:withCompletion:` - [#732](https://github.com/rs/SDWebImage/pull/732) [cd4b925](https://github.com/rs/SDWebImage/commit/cd4b925)
-- Exposed cache paths - [#339](https://github.com/rs/SDWebImage/issues/339)
-- Exposed `SDWebImageManager cacheKeyForURL:` - [5fd21e5](https://github.com/rs/SDWebImage/commit/5fd21e5)
-- Exposing `SDWebImageManager` instance from the `SDWebImagePrefetcher` class - [6c409cd](https://github.com/rs/SDWebImage/commit/6c409cd)
-- `SDWebImageManager` uses the shared instance of `SDWebImageDownloader` - [0772019](https://github.com/rs/SDWebImage/commit/0772019)
-- Refactor the cancel logic - [#771](https://github.com/rs/SDWebImage/pull/771) [6d01e80](https://github.com/rs/SDWebImage/commit/6d01e80) [23874cd](https://github.com/rs/SDWebImage/commit/23874cd) [a6f11b3](https://github.com/rs/SDWebImage/commit/a6f11b3)
-- Added method `SDWebImageManager cachedImageExistsForURL:` to check if an image exists in either the disk OR the memory cache - [#644](https://github.com/rs/SDWebImage/pull/644)
-- Added option to use the cached image instead of the placeholder for `UIImageView`. Replaces [#541](https://github.com/rs/SDWebImage/pull/541) - [#599](https://github.com/rs/SDWebImage/issues/599) [30f6726](https://github.com/rs/SDWebImage/commit/30f6726)
+- Add category for imageView's highlighted state `UIImageView+HighlightedWebCache` - [#646](https://github.com/SDWebImage/SDWebImage/pull/646) [#765](https://github.com/SDWebImage/SDWebImage/pull/765)
+- Keep a reference to the image URL - [#560](https://github.com/SDWebImage/SDWebImage/pull/560)
+- Pass imageURL in completedBlock - [#770](https://github.com/SDWebImage/SDWebImage/pull/770)
+- Implemented NTLM auth support. Replaced deprecated auth challenge methods from `NSURLConnectionDelegate` - [#711](https://github.com/SDWebImage/SDWebImage/pull/711) [50c4d1d](https://github.com/SDWebImage/SDWebImage/commit/50c4d1d)
+- Ability to suspend image downloaders `SDWebImageDownloader setSuspended:` - [#734](https://github.com/SDWebImage/SDWebImage/pull/734)
+- Delay the loading of the placeholder image until after load - [#701](https://github.com/SDWebImage/SDWebImage/pull/701)
+- Ability to save images to cache directly - [#714](https://github.com/SDWebImage/SDWebImage/pull/714)
+- Support for image orientation - [#764](https://github.com/SDWebImage/SDWebImage/pull/764)
+- Added async `SDImageCache removeImageForKey:withCompletion:` - [#732](https://github.com/SDWebImage/SDWebImage/pull/732) [cd4b925](https://github.com/SDWebImage/SDWebImage/commit/cd4b925)
+- Exposed cache paths - [#339](https://github.com/SDWebImage/SDWebImage/issues/339)
+- Exposed `SDWebImageManager cacheKeyForURL:` - [5fd21e5](https://github.com/SDWebImage/SDWebImage/commit/5fd21e5)
+- Exposing `SDWebImageManager` instance from the `SDWebImagePrefetcher` class - [6c409cd](https://github.com/SDWebImage/SDWebImage/commit/6c409cd)
+- `SDWebImageManager` uses the shared instance of `SDWebImageDownloader` - [0772019](https://github.com/SDWebImage/SDWebImage/commit/0772019)
+- Refactor the cancel logic - [#771](https://github.com/SDWebImage/SDWebImage/pull/771) [6d01e80](https://github.com/SDWebImage/SDWebImage/commit/6d01e80) [23874cd](https://github.com/SDWebImage/SDWebImage/commit/23874cd) [a6f11b3](https://github.com/SDWebImage/SDWebImage/commit/a6f11b3)
+- Added method `SDWebImageManager cachedImageExistsForURL:` to check if an image exists in either the disk OR the memory cache - [#644](https://github.com/SDWebImage/SDWebImage/pull/644)
+- Added option to use the cached image instead of the placeholder for `UIImageView`. Replaces [#541](https://github.com/SDWebImage/SDWebImage/pull/541) - [#599](https://github.com/SDWebImage/SDWebImage/issues/599) [30f6726](https://github.com/SDWebImage/SDWebImage/commit/30f6726)
 - Created workspace + added unit tests target
-- Updated documentation - [#476](https://github.com/rs/SDWebImage/issues/476) [#384](https://github.com/rs/SDWebImage/issues/384) [#526](https://github.com/rs/SDWebImage/issues/526) [#376](https://github.com/rs/SDWebImage/pull/376) [a8f5627](https://github.com/rs/SDWebImage/commit/a8f5627)
+- Updated documentation - [#476](https://github.com/SDWebImage/SDWebImage/issues/476) [#384](https://github.com/SDWebImage/SDWebImage/issues/384) [#526](https://github.com/SDWebImage/SDWebImage/issues/526) [#376](https://github.com/SDWebImage/SDWebImage/pull/376) [a8f5627](https://github.com/SDWebImage/SDWebImage/commit/a8f5627)
 
 ## Bugfixes
-- Fixed Xcode 6 builds - [#741](https://github.com/rs/SDWebImage/pull/741) [0b47342](https://github.com/rs/SDWebImage/commit/0b47342)
-- Fixed `diskImageExistsWithKey:` deadlock - [#625](https://github.com/rs/SDWebImage/issues/625) [6e4fbaf](https://github.com/rs/SDWebImage/commit/6e4fbaf)
+- Fixed Xcode 6 builds - [#741](https://github.com/SDWebImage/SDWebImage/pull/741) [0b47342](https://github.com/SDWebImage/SDWebImage/commit/0b47342)
+- Fixed `diskImageExistsWithKey:` deadlock - [#625](https://github.com/SDWebImage/SDWebImage/issues/625) [6e4fbaf](https://github.com/SDWebImage/SDWebImage/commit/6e4fbaf)
 For consistency, added async methods in `SDWebImageManager` `cachedImageExistsForURL:completion:` and `diskImageExistsForURL:completion:`
-- Fixed race condition that causes cancellation of one download operation to stop a run loop that is now used for another download operation. Race is introduced through `performSelector:onThread:withObject:waitUntilDone:` - [#698](https://github.com/rs/SDWebImage/pull/698)
-- Fixed race condition between operation cancelation and loading finish - [39db378](https://github.com/rs/SDWebImage/commit/39db378) [#621](https://github.com/rs/SDWebImage/pull/621) [#783](https://github.com/rs/SDWebImage/pull/783)
-- Fixed race condition in SDWebImageManager if one operation is cancelled - [f080e38](https://github.com/rs/SDWebImage/commit/f080e38) [#699](https://github.com/rs/SDWebImage/pull/699)
-- Fixed issue where cancelled operations aren't removed from `runningOperations` - [#68](https://github.com/rs/SDWebImage/issues/68)
-- Should not add url to failedURLs when timeout, cancel and so on - [#766](https://github.com/rs/SDWebImage/pull/766) [#707](https://github.com/rs/SDWebImage/issues/707)
-- Fixed potential *object mutated while being enumerated* crash - [#727](https://github.com/rs/SDWebImage/pull/727) [#728](https://github.com/rs/SDWebImage/pull/728) (revert a threading fix from [#727](https://github.com/rs/SDWebImage/pull/727))
-- Fixed `NSURLConnection` response statusCode not valid (e.g. 404), downloader never stops its runloop and hangs the operation queue - [#735](https://github.com/rs/SDWebImage/pull/735)
-- Fixed `SDWebImageRefreshCached` bug for large images - [#744](https://github.com/rs/SDWebImage/pull/744)
-- Added proper handling for `SDWebImageDownloaderLowPriority` - [#713](https://github.com/rs/SDWebImage/issues/713) [#745](https://github.com/rs/SDWebImage/issues/745)
-- Fixed fixing potential bug when sending a nil url for UIButton+WebCache - [#761](https://github.com/rs/SDWebImage/issues/761) [#763](https://github.com/rs/SDWebImage/pull/763)
-- Fixed issue [#529](https://github.com/rs/SDWebImage/pull/529) - if the `cacheKeyFilter` was set, this was ignored when computing the `scaledImageForKey`. For most of the developers that did not set `cacheKeyFilter`, the code will work exactly the same - [eb91fdd](https://github.com/rs/SDWebImage/commit/eb91fdd)
-- Returning error in setImage completedBlock if the url was nil. Added `dispatch_main_async_safe` macro - [#505](https://github.com/rs/SDWebImage/issues/505) [af3e4f8](https://github.com/rs/SDWebImage/commit/af3e4f8)
-- Avoid premature completion of prefetcher if request fails - [#751](https://github.com/rs/SDWebImage/pull/751)
-- Return nil from `SDScaledImageForKey` if the input image is nil - [#365](https://github.com/rs/SDWebImage/issues/365) [#750](https://github.com/rs/SDWebImage/pull/750)
-- Do not load placeholder image if `SDWebImageDelayPlaceholder` option specified - [#780](https://github.com/rs/SDWebImage/pull/780)
-- Make sure we call the `startPrefetchingAtIndex:` method from main queue - [#694](https://github.com/rs/SDWebImage/pull/694)
-- Save image in cache before calling completion block - [#700](https://github.com/rs/SDWebImage/pull/700)
-- Fixed arm64 warnings - [#685](https://github.com/rs/SDWebImage/pull/685) [#720](https://github.com/rs/SDWebImage/pull/720) [#721](https://github.com/rs/SDWebImage/pull/721) [#687](https://github.com/rs/SDWebImage/pull/687)
-- Improved logging - [#721](https://github.com/rs/SDWebImage/pull/721)
+- Fixed race condition that causes cancellation of one download operation to stop a run loop that is now used for another download operation. Race is introduced through `performSelector:onThread:withObject:waitUntilDone:` - [#698](https://github.com/SDWebImage/SDWebImage/pull/698)
+- Fixed race condition between operation cancelation and loading finish - [39db378](https://github.com/SDWebImage/SDWebImage/commit/39db378) [#621](https://github.com/SDWebImage/SDWebImage/pull/621) [#783](https://github.com/SDWebImage/SDWebImage/pull/783)
+- Fixed race condition in SDWebImageManager if one operation is cancelled - [f080e38](https://github.com/SDWebImage/SDWebImage/commit/f080e38) [#699](https://github.com/SDWebImage/SDWebImage/pull/699)
+- Fixed issue where cancelled operations aren't removed from `runningOperations` - [#68](https://github.com/SDWebImage/SDWebImage/issues/68)
+- Should not add url to failedURLs when timeout, cancel and so on - [#766](https://github.com/SDWebImage/SDWebImage/pull/766) [#707](https://github.com/SDWebImage/SDWebImage/issues/707)
+- Fixed potential *object mutated while being enumerated* crash - [#727](https://github.com/SDWebImage/SDWebImage/pull/727) [#728](https://github.com/SDWebImage/SDWebImage/pull/728) (revert a threading fix from [#727](https://github.com/SDWebImage/SDWebImage/pull/727))
+- Fixed `NSURLConnection` response statusCode not valid (e.g. 404), downloader never stops its runloop and hangs the operation queue - [#735](https://github.com/SDWebImage/SDWebImage/pull/735)
+- Fixed `SDWebImageRefreshCached` bug for large images - [#744](https://github.com/SDWebImage/SDWebImage/pull/744)
+- Added proper handling for `SDWebImageDownloaderLowPriority` - [#713](https://github.com/SDWebImage/SDWebImage/issues/713) [#745](https://github.com/SDWebImage/SDWebImage/issues/745)
+- Fixed fixing potential bug when sending a nil url for UIButton+WebCache - [#761](https://github.com/SDWebImage/SDWebImage/issues/761) [#763](https://github.com/SDWebImage/SDWebImage/pull/763)
+- Fixed issue [#529](https://github.com/SDWebImage/SDWebImage/pull/529) - if the `cacheKeyFilter` was set, this was ignored when computing the `scaledImageForKey`. For most of the developers that did not set `cacheKeyFilter`, the code will work exactly the same - [eb91fdd](https://github.com/SDWebImage/SDWebImage/commit/eb91fdd)
+- Returning error in setImage completedBlock if the url was nil. Added `dispatch_main_async_safe` macro - [#505](https://github.com/SDWebImage/SDWebImage/issues/505) [af3e4f8](https://github.com/SDWebImage/SDWebImage/commit/af3e4f8)
+- Avoid premature completion of prefetcher if request fails - [#751](https://github.com/SDWebImage/SDWebImage/pull/751)
+- Return nil from `SDScaledImageForKey` if the input image is nil - [#365](https://github.com/SDWebImage/SDWebImage/issues/365) [#750](https://github.com/SDWebImage/SDWebImage/pull/750)
+- Do not load placeholder image if `SDWebImageDelayPlaceholder` option specified - [#780](https://github.com/SDWebImage/SDWebImage/pull/780)
+- Make sure we call the `startPrefetchingAtIndex:` method from main queue - [#694](https://github.com/SDWebImage/SDWebImage/pull/694)
+- Save image in cache before calling completion block - [#700](https://github.com/SDWebImage/SDWebImage/pull/700)
+- Fixed arm64 warnings - [#685](https://github.com/SDWebImage/SDWebImage/pull/685) [#720](https://github.com/SDWebImage/SDWebImage/pull/720) [#721](https://github.com/SDWebImage/SDWebImage/pull/721) [#687](https://github.com/SDWebImage/SDWebImage/pull/687)
+- Improved logging - [#721](https://github.com/SDWebImage/SDWebImage/pull/721)
 - Added `SDWebImageCompat.m` to `SDWebImage+MKAnnotation` target
 
-## [3.6 Fix and cleanup on Mar 24th, 2014](https://github.com/rs/SDWebImage/releases/tag/3.6)
+## [3.6 Fix and cleanup on Mar 24th, 2014](https://github.com/SDWebImage/SDWebImage/releases/tag/3.6)
 
-## [3.5.4 ARM64 Support on Feb 24th, 2014](https://github.com/rs/SDWebImage/releases/tag/3.5.4)
+## [3.5.4 ARM64 Support on Feb 24th, 2014](https://github.com/SDWebImage/SDWebImage/releases/tag/3.5.4)
 
-## [3.5.3 on Jan 7th, 2014](https://github.com/rs/SDWebImage/releases/tag/3.5.3)
+## [3.5.3 on Jan 7th, 2014](https://github.com/SDWebImage/SDWebImage/releases/tag/3.5.3)
 
-## [3.5.2 on Jan 2nd, 2014](https://github.com/rs/SDWebImage/releases/tag/3.5.2)
+## [3.5.2 on Jan 2nd, 2014](https://github.com/SDWebImage/SDWebImage/releases/tag/3.5.2)
 
-## [3.5.1 on Dec 3rd, 2013](https://github.com/rs/SDWebImage/releases/tag/3.5.1)
+## [3.5.1 on Dec 3rd, 2013](https://github.com/SDWebImage/SDWebImage/releases/tag/3.5.1)
 
-## [3.5 WebP Target, iOS 7, Fixes on Oct 4th, 2013](https://github.com/rs/SDWebImage/releases/tag/3.5)
+## [3.5 WebP Target, iOS 7, Fixes on Oct 4th, 2013](https://github.com/SDWebImage/SDWebImage/releases/tag/3.5)
 
 - Fix iOS 7 related issues
 - Move `WebP` support to a dedicated target
@@ -626,68 +2115,68 @@ For consistency, added async methods in `SDWebImageManager` `cachedImageExistsFo
 - Fix timeout issue
 - Add some methods that allow to check if an image exists on disk without taking it off disk and decompressing it first
 
-## [3.4 Animated image category, bug fixes on Aug 13th, 2013](https://github.com/rs/SDWebImage/releases/tag/3.4)
+## [3.4 Animated image category, bug fixes on Aug 13th, 2013](https://github.com/SDWebImage/SDWebImage/releases/tag/3.4)
 
 - Add `calculateSizeWithCompletionBlock`
 - Add multiple download of images for animationImages property of `UIImageView`
-- Add background task for disk cleanup [#306](https://github.com/rs/SDWebImage/issues/306) 
-- Fix dead thread issue on iOS 5 [#444](https://github.com/rs/SDWebImage/pull/444), [#399](https://github.com/rs/SDWebImage/issues/399), [#466](https://github.com/rs/SDWebImage/issues/466)
-- Make IO operations cancelable to fix perf issue with heavy images [#462](https://github.com/rs/SDWebImage/issues/462) 
-- Fix crash `Collection <__NSArrayM: ...> was mutated while being enumerated.` [#471](https://github.com/rs/SDWebImage/pull/471) 
+- Add background task for disk cleanup [#306](https://github.com/SDWebImage/SDWebImage/issues/306) 
+- Fix dead thread issue on iOS 5 [#444](https://github.com/SDWebImage/SDWebImage/pull/444), [#399](https://github.com/SDWebImage/SDWebImage/issues/399), [#466](https://github.com/SDWebImage/SDWebImage/issues/466)
+- Make IO operations cancelable to fix perf issue with heavy images [#462](https://github.com/SDWebImage/SDWebImage/issues/462) 
+- Fix crash `Collection <__NSArrayM: ...> was mutated while being enumerated.` [#471](https://github.com/SDWebImage/SDWebImage/pull/471) 
 
-## [3.3 WebP, Animated GIF and more on Jun 14th, 2013](https://github.com/rs/SDWebImage/releases/tag/3.3)
+## [3.3 WebP, Animated GIF and more on Jun 14th, 2013](https://github.com/SDWebImage/SDWebImage/releases/tag/3.3)
 
-- WebP image format support [#410](https://github.com/rs/SDWebImage/issues/410)
-- Animated GIF support [#375](https://github.com/rs/SDWebImage/pull/375)
-- Custom image cache search paths [#156](https://github.com/rs/SDWebImage/pull/156)
+- WebP image format support [#410](https://github.com/SDWebImage/SDWebImage/issues/410)
+- Animated GIF support [#375](https://github.com/SDWebImage/SDWebImage/pull/375)
+- Custom image cache search paths [#156](https://github.com/SDWebImage/SDWebImage/pull/156)
 - Bug fixes
 
-## [3.2 Bug fixes on Mar 13th, 2013](https://github.com/rs/SDWebImage/releases/tag/3.2)
+## [3.2 Bug fixes on Mar 13th, 2013](https://github.com/SDWebImage/SDWebImage/releases/tag/3.2)
 
-- `SDWebImageRefreshCached` download option [#326](https://github.com/rs/SDWebImage/pull/326)
-- New `SDWebImageManager` delegate methods [ebd63a88c1](https://github.com/rs/SDWebImage/commit/ebd63a88c116ac7acfbeded5c84d0fffa2443438)
-- Fix long standing issue with alpha en JPEGs [#299](https://github.com/rs/SDWebImage/pull/299)
-- Add synchronous disk-cache loading method [#297](https://github.com/rs/SDWebImage/pull/297)
+- `SDWebImageRefreshCached` download option [#326](https://github.com/SDWebImage/SDWebImage/pull/326)
+- New `SDWebImageManager` delegate methods [ebd63a88c1](https://github.com/SDWebImage/SDWebImage/commit/ebd63a88c116ac7acfbeded5c84d0fffa2443438)
+- Fix long standing issue with alpha en JPEGs [#299](https://github.com/SDWebImage/SDWebImage/pull/299)
+- Add synchronous disk-cache loading method [#297](https://github.com/SDWebImage/SDWebImage/pull/297)
 - Fix `SDWebImageCacheMemoryOnly` flag
 - Bug fixes
 
-## [3.1 Bug fixes on Jan 21st, 2013](https://github.com/rs/SDWebImage/releases/tag/3.1)
+## [3.1 Bug fixes on Jan 21st, 2013](https://github.com/SDWebImage/SDWebImage/releases/tag/3.1)
 
-## [3.0 Complete rewrite on Nov 29th, 2012](https://github.com/rs/SDWebImage/releases/tag/3.0)
+## [3.0 Complete rewrite on Nov 29th, 2012](https://github.com/SDWebImage/SDWebImage/releases/tag/3.0)
 
 - Complete rewrite of the library using `GCD`, `ARC`, `NSCache` and blocks
 - Drop compatibility with iOS 3 and 4
 
-## [2.7.4 Bug fixes on Nov 14th, 2012](https://github.com/rs/SDWebImage/releases/tag/2.7.4)
+## [2.7.4 Bug fixes on Nov 14th, 2012](https://github.com/SDWebImage/SDWebImage/releases/tag/2.7.4)
 
-## [2.7.3 on Nov 3rd, 2012](https://github.com/rs/SDWebImage/releases/tag/2.7.3)
+## [2.7.3 on Nov 3rd, 2012](https://github.com/SDWebImage/SDWebImage/releases/tag/2.7.3)
 
-## [2.7.2 on Oct 23rd, 2012](https://github.com/rs/SDWebImage/releases/tag/2.7.2)
+## [2.7.2 on Oct 23rd, 2012](https://github.com/SDWebImage/SDWebImage/releases/tag/2.7.2)
 
-## [2.7.1 on Oct 19th, 2012](https://github.com/rs/SDWebImage/releases/tag/2.7.1)
+## [2.7.1 on Oct 19th, 2012](https://github.com/SDWebImage/SDWebImage/releases/tag/2.7.1)
 
-## [2.7 on Sep 8th, 2012](https://github.com/rs/SDWebImage/releases/tag/2.7)
+## [2.7 on Sep 8th, 2012](https://github.com/SDWebImage/SDWebImage/releases/tag/2.7)
 
-## [2.6 on May 4th, 2012](https://github.com/rs/SDWebImage/releases/tag/2.6)
+## [2.6 on May 4th, 2012](https://github.com/SDWebImage/SDWebImage/releases/tag/2.6)
 
-## [2.5 on Mar 22nd, 2012](https://github.com/rs/SDWebImage/releases/tag/2.5)
+## [2.5 on Mar 22nd, 2012](https://github.com/SDWebImage/SDWebImage/releases/tag/2.5)
 
-## [2.4 on Oct 1st, 2011](https://github.com/rs/SDWebImage/releases/tag/2.4)
+## [2.4 on Oct 1st, 2011](https://github.com/SDWebImage/SDWebImage/releases/tag/2.4)
 
-## [2.3 on Sep 16th, 2010](https://github.com/rs/SDWebImage/releases/tag/2.3)
+## [2.3 on Sep 16th, 2010](https://github.com/SDWebImage/SDWebImage/releases/tag/2.3)
 
-## [2.2 on Aug 29th, 2010](https://github.com/rs/SDWebImage/releases/tag/2.2)
+## [2.2 on Aug 29th, 2010](https://github.com/SDWebImage/SDWebImage/releases/tag/2.2)
 
-## [2.1.0 on Jun 12th, 2010](https://github.com/rs/SDWebImage/releases/tag/2.1.0)
+## [2.1.0 on Jun 12th, 2010](https://github.com/SDWebImage/SDWebImage/releases/tag/2.1.0)
 
-## [2.1 on Jun 12th, 2010](https://github.com/rs/SDWebImage/releases/tag/2.1)
+## [2.1 on Jun 12th, 2010](https://github.com/SDWebImage/SDWebImage/releases/tag/2.1)
 
-## [2.0.0 on Jun 9th, 2010](https://github.com/rs/SDWebImage/releases/tag/2.0.0)
+## [2.0.0 on Jun 9th, 2010](https://github.com/SDWebImage/SDWebImage/releases/tag/2.0.0)
 
-## [2.0 on Jun 9th, 2010](https://github.com/rs/SDWebImage/releases/tag/2.0)
+## [2.0 on Jun 9th, 2010](https://github.com/SDWebImage/SDWebImage/releases/tag/2.0)
 
-## [1.0.0 on Dec 31st, 2009](https://github.com/rs/SDWebImage/releases/tag/1.0.0)
+## [1.0.0 on Dec 31st, 2009](https://github.com/SDWebImage/SDWebImage/releases/tag/1.0.0)
 
-## [1.0 on Dec 31st, 2009](https://github.com/rs/SDWebImage/releases/tag/1.0)
+## [1.0 on Dec 31st, 2009](https://github.com/SDWebImage/SDWebImage/releases/tag/1.0)
 
 
diff --git a/Certificate/SDWebImage Signing Certificate.cer b/Certificate/SDWebImage Signing Certificate.cer
new file mode 100644
index 000000000..8fc0f412e
Binary files /dev/null and b/Certificate/SDWebImage Signing Certificate.cer differ
diff --git a/Certificate/SDWebImage Signing Certificate.pem b/Certificate/SDWebImage Signing Certificate.pem
new file mode 100644
index 000000000..cb1e5cd9a
--- /dev/null
+++ b/Certificate/SDWebImage Signing Certificate.pem	
@@ -0,0 +1,9 @@
+-----BEGIN RSA PUBLIC KEY-----
+MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA4cO+E0qz2aNxj0e1do/z
+uiukRdqrOUEYoR8B3i0fwNEAH5H7lvxgPqOrn3caWWtoT4ZNID32DByXoA4IZuPH
+wV2F35XfUY+ymf6SvKxVVuO80D0h1R7aC79LlBCLJtzalqSeaj+QNbDUBFS53DnZ
+hs5950X42/hXIK/+9a2WuET7LSe90VecFPTIIqc0PFYrtn3PxtCKtqBkbneWiKHP
+g4R0A6nENXGbLBvFAtsS3PuqXFlYE38qJNMrK4xK1B181uuD1VWyaVXQoXcRBEzO
+5iHKqBmdYEHojlRB4MRCsqrFMUPE9/2bzhQ2IuuIw4m+JLFN1DVJAQj/t7GXZvnE
+FwIDAQAB
+-----END RSA PUBLIC KEY-----
diff --git a/Configs/App-Debug.xcconfig b/Configs/App-Debug.xcconfig
new file mode 100644
index 000000000..2043cccea
--- /dev/null
+++ b/Configs/App-Debug.xcconfig
@@ -0,0 +1,8 @@
+// Configuration settings file format documentation can be found at:
+// https://help.apple.com/xcode/#/dev745c5c974
+
+#include "Module-Debug.xcconfig"
+#include "App-Shared.xcconfig"
+
+// If enabled, only the active architecture is built.
+ONLY_ACTIVE_ARCH = YES
diff --git a/Configs/App-Release.xcconfig b/Configs/App-Release.xcconfig
new file mode 100644
index 000000000..e4118dc75
--- /dev/null
+++ b/Configs/App-Release.xcconfig
@@ -0,0 +1,11 @@
+// Configuration settings file format documentation can be found at:
+// https://help.apple.com/xcode/#/dev745c5c974
+
+#include "Module-Release.xcconfig"
+#include "App-Shared.xcconfig"
+
+// If enabled, only the active architecture is built.
+ONLY_ACTIVE_ARCH = NO
+
+// Space-separated list of additional flags to pass to the compiler for C and Objective-C files. Be sure to backslash-escape any arguments that contain spaces or special characters, such as path names that may contain spaces. Use this setting if Xcode does not already provide UI for a particular C or Objective-C compiler flag.
+OTHER_CFLAGS = -DNS_BLOCK_ASSERTIONS=1
diff --git a/Configs/App-Shared.xcconfig b/Configs/App-Shared.xcconfig
new file mode 100644
index 000000000..96b230ee2
--- /dev/null
+++ b/Configs/App-Shared.xcconfig
@@ -0,0 +1,9 @@
+// Configuration settings file format documentation can be found at:
+// https://help.apple.com/xcode/#/dev745c5c974
+
+#include "Module-Shared.xcconfig"
+#include "Codesign.xcconfig"
+
+// Name of an asset catalog app icon set whose contents will be merged into the `Info.plist`.
+ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon
+_EXPERIMENTAL_SWIFT_EXPLICIT_MODULES = NO
diff --git a/Configs/Codesign.xcconfig b/Configs/Codesign.xcconfig
new file mode 100644
index 000000000..192c6eed9
--- /dev/null
+++ b/Configs/Codesign.xcconfig
@@ -0,0 +1 @@
+// You can set code sign related xcconfig in these file for debugging/testing, like CODE_SIGN_IDENTITY
\ No newline at end of file
diff --git a/Configs/Docc.xcconfig b/Configs/Docc.xcconfig
new file mode 100644
index 000000000..bbe363969
--- /dev/null
+++ b/Configs/Docc.xcconfig
@@ -0,0 +1,5 @@
+RUN_DOCUMENTATION_COMPILER = YES
+DOCC_EXTRACT_SWIFT_INFO_FOR_OBJC_SYMBOLS = YES
+DOCC_ENABLE_CXX_SUPPORT = YES
+DOCC_EXTRACT_EXTENSION_SYMBOLS = YES
+OTHER_DOCC_FLAGS= --transform-for-static-hosting
diff --git a/Configs/Dynamic.xcconfig b/Configs/Dynamic.xcconfig
new file mode 100644
index 000000000..067e0b2ec
--- /dev/null
+++ b/Configs/Dynamic.xcconfig
@@ -0,0 +1 @@
+MACH_O_TYPE = mh_dylib
\ No newline at end of file
diff --git a/Configs/Module-Debug.xcconfig b/Configs/Module-Debug.xcconfig
new file mode 100644
index 000000000..7a80c401f
--- /dev/null
+++ b/Configs/Module-Debug.xcconfig
@@ -0,0 +1,31 @@
+// Configuration settings file format documentation can be found at:
+// https://help.apple.com/xcode/#/dev745c5c974
+
+#include "Module-Shared.xcconfig"
+
+// Specifies whether binary files that are copied during the build, such as in a Copy Bundle Resources or Copy Files build phase, should be stripped of debugging symbols.
+COPY_PHASE_STRIP = NO
+
+// The type of debug information to produce.
+DEBUG_INFORMATION_FORMAT = dwarf
+
+// Controls whether assertion logic provided by `NSAssert` is included in the preprocessed source code or is elided during preprocessing.
+ENABLE_NS_ASSERTIONS = YES
+
+// When this setting is activated, the product will be built with options appropriate for running automated tests, such as making private interfaces accessible to the tests.
+ENABLE_TESTABILITY = YES
+
+// Specifies the degree to which the generated code is optimized for speed and binary size.
+GCC_OPTIMIZATION_LEVEL = 0
+
+// Space-separated list of preprocessor macros of the form `foo` or `foo=bar`
+GCC_PREPROCESSOR_DEFINITIONS = $(inherited) DEBUG=1
+
+// Metal debug info - not sure why we need it
+MTL_ENABLE_DEBUG_INFO = YES
+
+// If enabled, only the active architecture is built.
+ONLY_ACTIVE_ARCH = YES
+
+// If enabled, perform validation checks on the product as part of the build process.
+VALIDATE_PRODUCT = NO
diff --git a/Configs/Module-Release.xcconfig b/Configs/Module-Release.xcconfig
new file mode 100644
index 000000000..30e866358
--- /dev/null
+++ b/Configs/Module-Release.xcconfig
@@ -0,0 +1,28 @@
+// Configuration settings file format documentation can be found at:
+// https://help.apple.com/xcode/#/dev745c5c974
+
+#include "Module-Shared.xcconfig"
+
+// Specifies whether binary files that are copied during the build, such as in a Copy Bundle Resources or Copy Files build phase, should be stripped of debugging symbols.
+COPY_PHASE_STRIP = YES
+
+// The type of debug information to produce.
+DEBUG_INFORMATION_FORMAT = dwarf-with-dsym
+
+// Controls whether assertion logic provided by `NSAssert` is included in the preprocessed source code or is elided during preprocessing.
+ENABLE_NS_ASSERTIONS = NO
+
+// When this setting is activated, the product will be built with options appropriate for running automated tests, such as making private interfaces accessible to the tests.
+ENABLE_TESTABILITY = NO
+
+// Specifies the degree to which the generated code is optimized for speed and binary size.
+GCC_OPTIMIZATION_LEVEL = s
+
+// Metal debug info
+MTL_ENABLE_DEBUG_INFO = NO
+
+// If enabled, only the active architecture is built.
+ONLY_ACTIVE_ARCH = NO
+
+// If enabled, perform validation checks on the product as part of the build process.
+VALIDATE_PRODUCT = YES
diff --git a/Configs/Module-Shared.xcconfig b/Configs/Module-Shared.xcconfig
new file mode 100644
index 000000000..4d401d133
--- /dev/null
+++ b/Configs/Module-Shared.xcconfig
@@ -0,0 +1,228 @@
+// Configuration settings file format documentation can be found at:
+// https://help.apple.com/xcode/#/dev745c5c974
+
+// This setting is deprecated as of Xcode 8.3 and may not be supported in future versions. It is recommended that you disable the setting. If enabled, both `#include <header.h>`-style and `#include "header.h"`-style directives search the paths in `USER_HEADER_SEARCH_PATHS` before `HEADER_SEARCH_PATHS`
+ALWAYS_SEARCH_USER_PATHS = NO
+
+// Warn for missing nullability attributes
+CLANG_ANALYZER_NONNULL = YES
+
+// Warn when a number object, such as an instance of `NSNumber`, `CFNumberRef`, `OSNumber`, or `OSBoolean` is compared or converted to a primitive value instead of another object.
+CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE
+
+// Choose a standard or non-standard C++ language dialect. 
+CLANG_CXX_LANGUAGE_STANDARD = gnu++14
+
+// Choose a version of the C++ standard library to use.
+CLANG_CXX_LIBRARY = libc++
+
+// Enables the use of modules for system APIs. System headers are imported as semantic modules instead of raw headers.
+CLANG_ENABLE_MODULES = YES
+
+// Compiles reference-counted Objective-C code (when garbage collection is not enabled) to use Automatic Reference Counting.
+CLANG_ENABLE_OBJC_ARC = YES
+
+// Warn about block captures of implicitly autoreleasing parameters.
+CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES
+
+// Warn about implicit conversions to boolean values that are suspicious. For example, writing `if (foo)` where `foo` is the name a function will trigger a warning.
+CLANG_WARN_BOOL_CONVERSION = YES
+
+// Warn about suspicious uses of the comma operator.
+CLANG_WARN_COMMA = YES
+
+// Warn about implicit conversions of constant values that cause the constant value to change, either through a loss of precision, or entirely in its meaning.
+CLANG_WARN_CONSTANT_CONVERSION = YES
+
+// Warn if an Objective-C class either subclasses a deprecated class or overrides a method that has been marked deprecated or unavailable.
+CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES
+
+// Warn about direct accesses to the Objective-C `isa` pointer instead of using a runtime API.
+CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR
+
+// Warns about issues in documentation comments (`doxygen`-style) such as missing or incorrect documentation tags.
+CLANG_WARN_DOCUMENTATION_COMMENTS = YES
+
+// Warn about declaring the same method more than once within the same `@interface`.
+CLANG_WARN__DUPLICATE_METHOD_MATCH = YES
+
+// Warn about loop bodies that are suspiciously empty.
+CLANG_WARN_EMPTY_BODY = YES
+
+// Warn about implicit conversions between different kinds of enum values. For example, this can catch issues when using the wrong enum flag as an argument to a function or method.
+CLANG_WARN_ENUM_CONVERSION = YES
+
+// Warn if all paths through a function call itself.
+CLANG_WARN_INFINITE_RECURSION = YES
+
+// Warn about implicit conversions between pointers and integers. For example, this can catch issues when one incorrectly intermixes using `NSNumber*`'s and raw integers.
+CLANG_WARN_INT_CONVERSION = YES
+
+// Warn about non-literal expressions that evaluate to zero being treated as a null pointer.
+CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES
+
+// Warn about `@property` declarations that are implicitly atomic.
+CLANG_WARN_OBJC_IMPLICIT_ATOMIC_PROPERTIES = NO
+
+// Warn about implicit retains of `self` within blocks, which can create a retain-cycle.
+CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES
+
+// Warn about implicit conversions from Objective-C literals to values of incompatible type.
+CLANG_WARN_OBJC_LITERAL_CONVERSION = YES
+
+// Warn about classes that unintentionally do not subclass a root class, such as `NSObject`.
+CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR
+
+// Warn about ranged-based for loops.
+CLANG_WARN_RANGE_LOOP_ANALYSIS = YES
+
+// Warn about non-prototype declarations.
+CLANG_WARN_STRICT_PROTOTYPES = YES
+
+// Warn about suspicious uses of `std::move`.
+CLANG_WARN_SUSPICIOUS_MOVE = YES
+
+// Warn if an API that is newer than the deployment target is used without "if (@available(...))" guards.
+CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE
+
+// Warns about potentially unreachable code.
+CLANG_WARN_UNREACHABLE_CODE = YES
+
+// This setting defines the current version of the project. The value must be a integer or floating point number, such as `57` or `365.8`.
+CURRENT_PROJECT_VERSION = 1
+
+// If enabled, the product will be treated as defining its own module. This enables automatic production of LLVM module map files when appropriate, and allows the product to be imported as a module.
+DEFINES_MODULE = YES
+
+// Determines the compatibility version of the resulting library, bundle, or framework binary.
+DYLIB_COMPATIBILITY_VERSION = 1
+
+// This setting defines the current version of any framework built by the project. As with `CURRENT_PROJECT_VERSION`, the value must be an integer or floating point number, such as `57` or `365.8`.
+DYLIB_CURRENT_VERSION = 1
+
+// Sets the base value for the internal `install path` (`LC_ID_DYLIB`) in a dynamic library. This will be combined with the `EXECUTABLE_PATH` to form the full install path.
+DYLIB_INSTALL_NAME_BASE = @rpath
+
+// Controls whether `objc_msgSend` calls must be cast to the appropriate function pointer type before being called.
+ENABLE_STRICT_OBJC_MSGSEND = YES
+
+// This is a list of paths to folders containing frameworks to be searched by the compiler for both included or imported header files when compiling C, Objective-C, C++, or Objective-C++, and by the linker for frameworks used by the product. Paths are delimited by whitespace, so any paths with spaces in them must be properly quoted.
+FRAMEWORK_SEARCH_PATHS = $(inherited)
+
+// Choose a standard or non-standard C language dialect.
+GCC_C_LANGUAGE_STANDARD = gnu11
+
+// Faster function calls for applications. Not appropriate for shared libraries, which need to be position-independent.
+GCC_DYNAMIC_NO_PIC = NO
+
+// In C, allocate even uninitialized global variables in the data section of the object file, rather than generating them as common blocks. 
+GCC_NO_COMMON_BLOCKS = YES
+
+// When enabled, all symbols are declared `private extern` unless explicitly marked to be exported using `\_\_attribute\_\_((visibility("default")))` in code. If not enabled, all symbols are exported unless explicitly marked as `private extern`.
+GCC_SYMBOLS_PRIVATE_EXTERN = NO
+
+// Enabling this option causes all warnings to be treated as errors.
+GCC_TREAT_WARNINGS_AS_ERRORS = NO
+
+// Warn if a value is implicitly converted from a 64-bit type to a 32-bit type. This is a subset of the warnings provided by -Wconversion.
+GCC_WARN_64_TO_32_BIT_CONVERSION = YES
+
+// Warn if a structure's initializer has some fields missing.
+GCC_WARN_ABOUT_MISSING_FIELD_INITIALIZERS = YES
+
+// Warn when a source file does not end with a newline.
+GCC_WARN_ABOUT_MISSING_NEWLINE = YES
+
+// Causes warnings to be emitted about missing prototypes.
+GCC_WARN_ABOUT_MISSING_PROTOTYPES = YES
+
+// Causes warnings to be emitted when a function with a defined return type (not `void`) contains a return statement without a return-value. Also emits a warning when a function is defined without specifying a return type.
+GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR
+
+// Warn if an aggregate or union initializer is not fully bracketed.
+GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES
+
+// Warn whenever a local variable shadows another local variable, parameter or global variable or whenever a builtin function is shadowed.
+GCC_WARN_SHADOW = YES
+
+// Warn when a comparison between signed and unsigned values could produce an incorrect result when the signed value is converted to unsigned.
+GCC_WARN_SIGN_COMPARE = YES
+
+// Warn if a `@selector(...)` expression referring to an undeclared selector is found. A selector is considered undeclared if no method with that name has been declared before the `@selector(...)` expression, either explicitly in an `@interface` or `@protocol` declaration, or implicitly in an `@implementation` section.
+GCC_WARN_UNDECLARED_SELECTOR = YES
+
+// Warn if a variable might be clobbered by a `setjmp` call or if an automatic variable is used without prior initialization. The compiler may not detect all cases where an automatic variable is initialized or all usage patterns that may lead to use prior to initialization.
+GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE
+
+// Warn whenever a static function is declared but not defined or a noninline static function is unused.
+GCC_WARN_UNUSED_FUNCTION = YES
+
+// Warn whenever a label is declared but not used.
+GCC_WARN_UNUSED_LABEL = YES
+
+// Warn whenever a function parameter is unused aside from its declaration.
+GCC_WARN_UNUSED_PARAMETER = NO
+
+// Warn whenever a local variable or nonconstant static variable is unused aside from its declaration.
+GCC_WARN_UNUSED_VARIABLE = YES
+
+// This is a list of paths to folders to be searched by the compiler for included or imported header files when compiling C, Objective-C, C++, or Objective-C++. Paths are delimited by whitespace, so any paths with spaces in them need to be properly quoted.
+HEADER_SEARCH_PATHS = $(inherited)
+
+// Code will load on this and later versions of iOS. Framework APIs that are unavailable in earlier versions will be weak-linked; your code should check for null function pointers or specific system versions before calling newer APIs.
+IPHONEOS_DEPLOYMENT_TARGET = 9.0
+
+// This is a list of paths to be added to the `runpath` search path list for the image being created. At runtime, `dyld` uses the `runpath` when searching for dylibs whose load path begins with `@rpath/`. 
+LD_RUNPATH_SEARCH_PATHS = $(inherited) @executable_path/Frameworks @loader_path/Frameworks
+
+// This is a list of paths to folders to be searched by the linker for libraries used by the product. Paths are delimited by whitespace, so any paths with spaces in them need to be properly quoted.
+LIBRARY_SEARCH_PATHS = $(inherited)
+
+// Code will load on this and later versions of macOS. Framework APIs that are unavailable in earlier versions will be weak-linked; your code should check for null function pointers or specific system versions before calling newer APIs.
+MACOSX_DEPLOYMENT_TARGET = 10.11
+
+// Options defined in this setting are passed to invocations of the linker.
+OTHER_LDFLAGS = -ObjC
+
+// A string that uniquely identifies the bundle. The string should be in reverse DNS format using only alphanumeric characters (`A-Z`, `a-z`, `0-9`), the dot (`.`), and the hyphen (`-`). This value is used as the `CFBundleIdentifier` in the `Info.plist` of the built bundle.
+PRODUCT_BUNDLE_IDENTIFIER_PREFIX = com.dailymotion
+PRODUCT_BUNDLE_IDENTIFIER = $(PRODUCT_BUNDLE_IDENTIFIER_PREFIX).${PRODUCT_NAME:rfc1034identifier}
+
+// This is the basename of the product generated by the target.
+PRODUCT_NAME = $(TARGET_NAME)
+
+// Activating this setting will cause Xcode to run the `Clang` static analysis tool on qualifying source files during every build.
+RUN_CLANG_STATIC_ANALYZER = YES
+
+// The name or path of the base SDK being used during the build. The product will be built against the headers and libraries located inside the indicated SDK. This path will be prepended to all search paths, and will be passed through the environment to the compiler and linker. Additional SDKs can be specified in the `ADDITIONAL_SDKS` setting.
+SDKROOT = macosx
+
+// If enabled, don't install built products even if deployment locations are active.
+SKIP_INSTALL = YES
+
+// The list of supported platforms from which a base SDK can be used. This setting is used if the product can be built for multiple platforms using different SDKs.
+SUPPORTED_PLATFORMS = macosx iphoneos iphonesimulator watchsimulator watchos appletvsimulator appletvos xrsimulator xros
+
+// The build system uses the selected device to set the correct value for the `UIDeviceFamily` key it adds to the target's `Info.plist` file. This also drives the --target-device flag to actool, which determines the idioms selected during catalog compilation for iOS platforms.
+TARGETED_DEVICE_FAMILY = 1,2,3,4,5,6,7
+
+// Code will load on this and later versions of tvOS. Framework APIs that are unavailable in earlier versions will be weak-linked; your code should check for null function pointers or specific system versions before calling newer APIs.
+TVOS_DEPLOYMENT_TARGET = 9.0
+
+// Selects the process used for version-stamping generated files. * *None:* Use no versioning system. * *Apple Generic:* Use the current project version setting. [apple-generic]
+VERSIONING_SYSTEM = apple-generic
+
+// Code will load on this and later versions of watchOS. Framework APIs that are unavailable in earlier versions will be weak-linked; your code should check for null function pointers or specific system versions before calling newer APIs.
+WATCHOS_DEPLOYMENT_TARGET = 2.0
+
+// Code will load on this and later versions of visionOS. Framework APIs that are unavailable in earlier versions will be weak-linked; your code should check for null function pointers or specific system versions before calling newer APIs.
+XROS_DEPLOYMENT_TARGET = 1.0
+
+// macOS Catalyst support
+SUPPORTS_MACCATALYST = YES
+
+// macOS Catalyst support
+DERIVE_MACCATALYST_PRODUCT_BUNDLE_IDENTIFIER = NO
+
+// When enabled, this causes the compiler and linker to disallow use of APIs that are not available to app extensions and to disallow linking to frameworks that have not been built with this setting enabled.
+APPLICATION_EXTENSION_API_ONLY = YES
diff --git a/Configs/Static.xcconfig b/Configs/Static.xcconfig
new file mode 100644
index 000000000..731865fe5
--- /dev/null
+++ b/Configs/Static.xcconfig
@@ -0,0 +1 @@
+MACH_O_TYPE = staticlib
\ No newline at end of file
diff --git a/Configs/Test-Debug.xcconfig b/Configs/Test-Debug.xcconfig
new file mode 100644
index 000000000..76e4e28ce
--- /dev/null
+++ b/Configs/Test-Debug.xcconfig
@@ -0,0 +1,8 @@
+// Configuration settings file format documentation can be found at:
+// https://help.apple.com/xcode/#/dev745c5c974
+
+#include "Module-Debug.xcconfig"
+#include "Test-Shared.xcconfig"
+
+// If enabled, only the active architecture is built.
+ONLY_ACTIVE_ARCH = YES
diff --git a/Configs/Test-Release.xcconfig b/Configs/Test-Release.xcconfig
new file mode 100644
index 000000000..ddd2a935c
--- /dev/null
+++ b/Configs/Test-Release.xcconfig
@@ -0,0 +1,11 @@
+// Configuration settings file format documentation can be found at:
+// https://help.apple.com/xcode/#/dev745c5c974
+
+#include "Module-Release.xcconfig"
+#include "Test-Shared.xcconfig"
+
+// If enabled, only the active architecture is built.
+ONLY_ACTIVE_ARCH = NO
+
+// Space-separated list of additional flags to pass to the compiler for C and Objective-C files. Be sure to backslash-escape any arguments that contain spaces or special characters, such as path names that may contain spaces. Use this setting if Xcode does not already provide UI for a particular C or Objective-C compiler flag.
+OTHER_CFLAGS = -DNS_BLOCK_ASSERTIONS=1
diff --git a/Configs/Test-Shared.xcconfig b/Configs/Test-Shared.xcconfig
new file mode 100644
index 000000000..cd9d27400
--- /dev/null
+++ b/Configs/Test-Shared.xcconfig
@@ -0,0 +1,14 @@
+// Configuration settings file format documentation can be found at:
+// https://help.apple.com/xcode/#/dev745c5c974
+
+#include "Module-Shared.xcconfig"
+#include "Codesign.xcconfig"
+
+// This is a list of paths to folders to be searched by the compiler for included or imported header files when compiling C, Objective-C, C++, or Objective-C++. Paths are delimited by whitespace, so any paths with spaces in them need to be properly quoted.
+HEADER_SEARCH_PATHS = $(inherited) "$(SRCROOT)/../SDWebImage/Private"
+
+// Warns when a quoted include is used instead of a framework style include in a framework header.
+CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = NO
+
+// If enabled, the build system will sandbox user scripts to disallow undeclared input/output dependencies.
+ENABLE_USER_SCRIPT_SANDBOXING = NO
diff --git a/Docs/API-Diff/5.0/apidiff.css b/Docs/API-Diff/5.0/apidiff.css
new file mode 100644
index 000000000..06231d305
--- /dev/null
+++ b/Docs/API-Diff/5.0/apidiff.css
@@ -0,0 +1,103 @@
+body {
+    font: 12px 'Lucida Grande', 'Lucida Sans Unicode', Helvetica, Arial, Verdana, sans-serif;
+    margin: 0;
+    padding: 0 2em 2em 2em;
+}
+
+h1 {
+    margin-top: 30px;
+    margin-bottom: 30px;
+    font-size: 28px;
+    font-weight: bold;
+}
+
+.headerFile {
+    margin-left: 20px;
+}
+
+.headerName {
+    margin:  15px 0px 10px -20px;
+    padding:  4px 4px  4px  20px;
+    font-weight: bold;
+    font-size: 120%;
+    background-color: #f8f8f8;
+}
+
+.differenceGroup {
+    margin-top: 5px;
+}
+
+.difference {
+    padding-left: 20px;
+    font-family: Courier, Consolas, monospace;
+    font-size: 110%;
+}
+
+.status {
+    font-style: italic;
+    font-size: 80%;
+}
+
+.removed {
+    color: red;
+}
+
+.added {
+    color: blue;
+}
+
+.modified {
+    color: #080;
+}
+
+.declaration {
+    font-family: Courier, Consolas, monospace;
+}
+
+table {
+    border: 1px #888 solid;
+    padding: 2px;
+    border-spacing: 0px;
+    border-collapse: collapse;
+    margin-left: 40px;
+    margin-top: 7px;
+}
+
+td, th {
+    font-size: 10px;
+    border: 1px #888 solid;
+    padding:3px 6px;
+}
+
+th {
+    font-size: 10px;
+    text-align: center;
+    background-color: #eee;
+}
+
+td {
+    font-size: 90%;
+    text-align: left;
+}
+
+ul {
+    list-style: disc outside;
+    margin: 0 0 0 16px;
+    padding: 0;
+}
+
+li {
+    margin-top: 7px;
+}
+
+.message {
+    margin-left: 20px;
+    font-style: italic;
+    color: #888;
+}
+
+a:link          { color: #18396E; text-decoration: none; }
+a:active        { color: #18396E; text-decoration: none; }
+a:visited       { color: #003366; text-decoration: none; }
+a:link:hover    { color: #18396E; text-decoration: underline; }
+a:visited:hover { color: #003366; text-decoration: underline; }
diff --git a/Docs/API-Diff/5.0/apidiff.html b/Docs/API-Diff/5.0/apidiff.html
new file mode 100644
index 000000000..23548b603
--- /dev/null
+++ b/Docs/API-Diff/5.0/apidiff.html
@@ -0,0 +1,1375 @@
+<html>
+<head>
+<link rel="stylesheet" href="apidiff.css" type="text/css" />
+<meta charset="utf-8" />
+</head>
+<body>
+
+<div class="headerFile">
+<div class="headerName">FLAnimatedImage.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status removed">Removed</span> kFLAnimatedImageDelayTimeIntervalMinimum</div>
+<div class="difference"><span class="status removed">Removed</span> FLAnimatedImage</div>
+<div class="difference"><span class="status removed">Removed</span> FLAnimatedImage.posterImage</div>
+<div class="difference"><span class="status removed">Removed</span> FLAnimatedImage.size</div>
+<div class="difference"><span class="status removed">Removed</span> FLAnimatedImage.loopCount</div>
+<div class="difference"><span class="status removed">Removed</span> FLAnimatedImage.delayTimesForIndexes</div>
+<div class="difference"><span class="status removed">Removed</span> FLAnimatedImage.frameCount</div>
+<div class="difference"><span class="status removed">Removed</span> FLAnimatedImage.frameCacheSizeCurrent</div>
+<div class="difference"><span class="status removed">Removed</span> FLAnimatedImage.frameCacheSizeMax</div>
+<div class="difference"><span class="status removed">Removed</span> -[FLAnimatedImage imageLazilyCachedAtIndex:]</div>
+<div class="difference"><span class="status removed">Removed</span> +[FLAnimatedImage sizeForImage:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[FLAnimatedImage initWithAnimatedGIFData:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[FLAnimatedImage initWithAnimatedGIFData:optimalFrameCacheSize:predrawingEnabled:]</div>
+<div class="difference"><span class="status removed">Removed</span> +[FLAnimatedImage animatedImageWithGIFData:]</div>
+<div class="difference"><span class="status removed">Removed</span> FLAnimatedImage.data</div>
+<div class="difference"><span class="status removed">Removed</span> FLLogLevel</div>
+<div class="difference"><span class="status removed">Removed</span> FLLogLevelNone</div>
+<div class="difference"><span class="status removed">Removed</span> FLLogLevelError</div>
+<div class="difference"><span class="status removed">Removed</span> FLLogLevelWarn</div>
+<div class="difference"><span class="status removed">Removed</span> FLLogLevelInfo</div>
+<div class="difference"><span class="status removed">Removed</span> FLLogLevelDebug</div>
+<div class="difference"><span class="status removed">Removed</span> FLLogLevelVerbose</div>
+<div class="difference"><span class="status removed">Removed</span> +[FLAnimatedImage setLogBlock:logLevel:]</div>
+<div class="difference"><span class="status removed">Removed</span> +[FLAnimatedImage logStringFromBlock:withLevel:]</div>
+<div class="difference"><span class="status removed">Removed</span> #def FLLog</div>
+<div class="difference"><span class="status removed">Removed</span> FLWeakProxy</div>
+<div class="difference"><span class="status removed">Removed</span> +[FLWeakProxy weakProxyForObject:]</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">FLAnimatedImageView.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status removed">Removed</span> FLAnimatedImageView</div>
+<div class="difference"><span class="status removed">Removed</span> FLAnimatedImageView.animatedImage</div>
+<div class="difference"><span class="status removed">Removed</span> FLAnimatedImageView.loopCompletionBlock</div>
+<div class="difference"><span class="status removed">Removed</span> FLAnimatedImageView.currentFrame</div>
+<div class="difference"><span class="status removed">Removed</span> FLAnimatedImageView.currentFrameIndex</div>
+<div class="difference"><span class="status removed">Removed</span> FLAnimatedImageView.runLoopMode</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">FLAnimatedImageView+WebCache.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status removed">Removed</span> UIImage (FLAnimatedImage)</div>
+<div class="difference"><span class="status removed">Removed</span> UIImage.sd_FLAnimatedImage</div>
+<div class="difference"><span class="status removed">Removed</span> FLAnimatedImageView.sd_optimalFrameCacheSize</div>
+<div class="difference"><span class="status removed">Removed</span> FLAnimatedImageView.sd_predrawingEnabled</div>
+<div class="difference"><span class="status removed">Removed</span> FLAnimatedImageView.sd_cacheFLAnimatedImage</div>
+<div class="difference"><span class="status removed">Removed</span> -[FLAnimatedImageView sd_setImageWithURL:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[FLAnimatedImageView sd_setImageWithURL:placeholderImage:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[FLAnimatedImageView sd_setImageWithURL:placeholderImage:options:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[FLAnimatedImageView sd_setImageWithURL:completed:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[FLAnimatedImageView sd_setImageWithURL:placeholderImage:completed:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[FLAnimatedImageView sd_setImageWithURL:placeholderImage:options:completed:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[FLAnimatedImageView sd_setImageWithURL:placeholderImage:options:progress:completed:]</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">MKAnnotationView+WebCache.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status removed">Removed</span> MKAnnotationView (WebCache)</div>
+<div class="difference"><span class="status removed">Removed</span> -[MKAnnotationView sd_setImageWithURL:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[MKAnnotationView sd_setImageWithURL:placeholderImage:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[MKAnnotationView sd_setImageWithURL:placeholderImage:options:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[MKAnnotationView sd_setImageWithURL:completed:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[MKAnnotationView sd_setImageWithURL:placeholderImage:completed:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[MKAnnotationView sd_setImageWithURL:placeholderImage:options:completed:]</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">NSData+ImageContentType.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status removed">Removed</span> SDImageFormatUndefined</div>
+<div class="difference"><span class="status removed">Removed</span> SDImageFormatJPEG</div>
+<div class="difference"><span class="status removed">Removed</span> SDImageFormatPNG</div>
+<div class="difference"><span class="status removed">Removed</span> SDImageFormatGIF</div>
+<div class="difference"><span class="status removed">Removed</span> SDImageFormatTIFF</div>
+<div class="difference"><span class="status removed">Removed</span> SDImageFormatWebP</div>
+<div class="difference"><span class="status removed">Removed</span> SDImageFormatHEIC</div>
+<div class="difference"><span class="status removed">Removed</span> SDImageFormatHEIF</div>
+<div class="difference"><span class="status removed">Removed</span> +[NSData sd_UTTypeFromSDImageFormat:]</div>
+</div>
+
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDImageFormatUndefined</div>
+<div class="difference"><span class="status added">Added</span> SDImageFormatJPEG</div>
+<div class="difference"><span class="status added">Added</span> SDImageFormatPNG</div>
+<div class="difference"><span class="status added">Added</span> SDImageFormatGIF</div>
+<div class="difference"><span class="status added">Added</span> SDImageFormatTIFF</div>
+<div class="difference"><span class="status added">Added</span> SDImageFormatWebP</div>
+<div class="difference"><span class="status added">Added</span> SDImageFormatHEIC</div>
+<div class="difference"><span class="status added">Added</span> SDImageFormatHEIF</div>
+<div class="difference"><span class="status added">Added</span> +[NSData sd_UTTypeFromImageFormat:]</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDAnimatedImage.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDAnimatedImage</div>
+<div class="difference"><span class="status added">Added</span> -[SDAnimatedImage initWithData:scale:options:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDAnimatedImage initWithAnimatedCoder:scale:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDAnimatedImage preloadAllFrames]</div>
+<div class="difference"><span class="status added">Added</span> -[SDAnimatedImage unloadAllFrames]</div>
+<div class="difference"><span class="status added">Added</span> SDAnimatedImage.allFramesLoaded</div>
+<div class="difference"><span class="status added">Added</span> SDAnimatedImage</div>
+<div class="difference"><span class="status added">Added</span> +[SDAnimatedImage imageNamed:]</div>
+<div class="difference"><span class="status added">Added</span> +[SDAnimatedImage imageNamed:inBundle:compatibleWithTraitCollection:]</div>
+<div class="difference"><span class="status added">Added</span> +[SDAnimatedImage imageWithContentsOfFile:]</div>
+<div class="difference"><span class="status added">Added</span> +[SDAnimatedImage imageWithData:]</div>
+<div class="difference"><span class="status added">Added</span> +[SDAnimatedImage imageWithData:scale:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDAnimatedImage initWithContentsOfFile:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDAnimatedImage initWithData:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDAnimatedImage initWithData:scale:]</div>
+<div class="difference"><span class="status added">Added</span> SDAnimatedImage.animatedImageFormat</div>
+<div class="difference"><span class="status added">Added</span> SDAnimatedImage.animatedImageData</div>
+<div class="difference"><span class="status added">Added</span> SDAnimatedImage.scale</div>
+<div class="difference"><span class="status added">Added</span> -[SDAnimatedImage preloadAllFrames]</div>
+<div class="difference"><span class="status added">Added</span> -[SDAnimatedImage unloadAllFrames]</div>
+<div class="difference"><span class="status added">Added</span> SDAnimatedImage.allFramesLoaded</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDAnimatedImageView.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDAnimatedImageView</div>
+<div class="difference"><span class="status added">Added</span> SDAnimatedImageView.currentFrame</div>
+<div class="difference"><span class="status added">Added</span> SDAnimatedImageView.currentFrameIndex</div>
+<div class="difference"><span class="status added">Added</span> SDAnimatedImageView.currentLoopCount</div>
+<div class="difference"><span class="status added">Added</span> SDAnimatedImageView.shouldCustomLoopCount</div>
+<div class="difference"><span class="status added">Added</span> SDAnimatedImageView.animationRepeatCount</div>
+<div class="difference"><span class="status added">Added</span> SDAnimatedImageView.maxBufferSize</div>
+<div class="difference"><span class="status added">Added</span> SDAnimatedImageView.shouldIncrementalLoad</div>
+<div class="difference"><span class="status added">Added</span> SDAnimatedImageView.runLoopMode</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDAnimatedImageView+WebCache.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> -[SDAnimatedImageView sd_setImageWithURL:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDAnimatedImageView sd_setImageWithURL:placeholderImage:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDAnimatedImageView sd_setImageWithURL:placeholderImage:options:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDAnimatedImageView sd_setImageWithURL:placeholderImage:options:context:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDAnimatedImageView sd_setImageWithURL:completed:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDAnimatedImageView sd_setImageWithURL:placeholderImage:completed:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDAnimatedImageView sd_setImageWithURL:placeholderImage:options:completed:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDAnimatedImageView sd_setImageWithURL:placeholderImage:options:progress:completed:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDAnimatedImageView sd_setImageWithURL:placeholderImage:options:context:progress:completed:]</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDDiskCache.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDDiskCache</div>
+<div class="difference"><span class="status added">Added</span> -[SDDiskCache initWithCachePath:config:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDDiskCache containsDataForKey:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDDiskCache dataForKey:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDDiskCache setData:forKey:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDDiskCache removeDataForKey:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDDiskCache removeAllData]</div>
+<div class="difference"><span class="status added">Added</span> -[SDDiskCache removeExpiredData]</div>
+<div class="difference"><span class="status added">Added</span> -[SDDiskCache cachePathForKey:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDDiskCache totalCount]</div>
+<div class="difference"><span class="status added">Added</span> -[SDDiskCache totalSize]</div>
+<div class="difference"><span class="status added">Added</span> SDDiskCache</div>
+<div class="difference"><span class="status added">Added</span> SDDiskCache.config</div>
+<div class="difference"><span class="status added">Added</span> -[SDDiskCache moveCacheDirectoryFromPath:toPath:]</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDImageAPNGCoder.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDImageAPNGCoder</div>
+<div class="difference"><span class="status added">Added</span> SDImageAPNGCoder.sharedCoder</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDImageCache.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status removed">Removed</span> SDImageCacheQueryDataWhenInMemory</div>
+<div class="difference"><span class="status removed">Removed</span> SDImageCacheQueryDiskSync</div>
+<div class="difference"><span class="status removed">Removed</span> SDCacheQueryCompletedBlock</div>
+<div class="difference"><span class="status removed">Removed</span> SDWebImageCheckCacheCompletionBlock</div>
+<div class="difference"><span class="status removed">Removed</span> SDWebImageCalculateSizeBlock</div>
+<div class="difference"><span class="status removed">Removed</span> SDImageCache.maxMemoryCost</div>
+<div class="difference"><span class="status removed">Removed</span> SDImageCache.maxMemoryCountLimit</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDImageCache makeDiskCachePath:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDImageCache addReadOnlyCachePath:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDImageCache getSize]</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDImageCache getDiskCount]</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDImageCache cachePathForKey:inPath:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDImageCache defaultCachePathForKey:]</div>
+</div>
+
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDImageCacheQueryMemoryData</div>
+<div class="difference"><span class="status added">Added</span> SDImageCacheQueryMemoryDataSync</div>
+<div class="difference"><span class="status added">Added</span> SDImageCacheQueryDiskDataSync</div>
+<div class="difference"><span class="status added">Added</span> SDImageCacheAvoidDecodeImage</div>
+<div class="difference"><span class="status added">Added</span> SDImageCacheDecodeFirstFrameOnly</div>
+<div class="difference"><span class="status added">Added</span> SDImageCachePreloadAllFrames</div>
+<div class="difference"><span class="status added">Added</span> SDImageCache.diskCachePath</div>
+<div class="difference"><span class="status added">Added</span> SDImageCache.additionalCachePathBlock</div>
+<div class="difference"><span class="status added">Added</span> -[SDImageCache initWithNamespace:diskCacheDirectory:config:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDImageCache cachePathForKey:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDImageCache storeImageToMemory:forKey:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDImageCache queryCacheOperationForKey:options:context:done:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDImageCache removeImageFromMemoryForKey:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDImageCache removeImageFromDiskForKey:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDImageCache totalDiskSize]</div>
+<div class="difference"><span class="status added">Added</span> -[SDImageCache totalDiskCount]</div>
+</div>
+
+
+<div class="differenceGroup">
+<div class="difference"><span class="status modified">Modified</span> SDImageCache</div>
+<table>
+<tr><th></th><th>Protocols</th></tr>
+<tr><th>From</th><td><em>none</em></td></tr>
+<tr><th>To</th><td>SDImageCache</td></tr>
+</table>
+<br>
+<div class="difference"><span class="status modified">Modified</span> SDImageCache.config</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">@property (nonatomic, readonly, nonnull) SDImageCacheConfig *config</td></tr>
+<tr><th>To</th><td class="declaration">@property (nonatomic, readonly, copy, nonnull) SDImageCacheConfig *config</td></tr>
+</table>
+<br>
+<div class="difference"><span class="status modified">Modified</span> +[SDImageCache sharedImageCache]</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">+ (nonnull instancetype)sharedImageCache</td></tr>
+<tr><th>To</th><td class="declaration">@property (class, nonatomic, readonly, nonnull) SDImageCache *sharedImageCache</td></tr>
+</table>
+<br>
+<div class="difference"><span class="status modified">Modified</span> -[SDImageCache initWithNamespace:diskCacheDirectory:]</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">- (nonnull instancetype)initWithNamespace:(nonnull NSString *)ns diskCacheDirectory:(nonnull NSString *)directory</td></tr>
+<tr><th>To</th><td class="declaration">- (nonnull instancetype)initWithNamespace:(nonnull NSString *)ns diskCacheDirectory:(nullable NSString *)directory</td></tr>
+</table>
+<br>
+<div class="difference"><span class="status modified">Modified</span> -[SDImageCache diskImageExistsWithKey:completion:]</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">- (void)diskImageExistsWithKey:(nullable NSString *)key completion:(nullable SDWebImageCheckCacheCompletionBlock)completionBlock</td></tr>
+<tr><th>To</th><td class="declaration">- (void)diskImageExistsWithKey:(nullable NSString *)key completion:(nullable SDImageCacheCheckCompletionBlock)completionBlock</td></tr>
+</table>
+<br>
+<div class="difference"><span class="status modified">Modified</span> -[SDImageCache queryCacheOperationForKey:done:]</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">- (nullable NSOperation *)queryCacheOperationForKey:(nullable NSString *)key done:(nullable SDCacheQueryCompletedBlock)doneBlock</td></tr>
+<tr><th>To</th><td class="declaration">- (nullable NSOperation *)queryCacheOperationForKey:(nullable NSString *)key done:(nullable SDImageCacheQueryCompletionBlock)doneBlock</td></tr>
+</table>
+<br>
+<div class="difference"><span class="status modified">Modified</span> -[SDImageCache queryCacheOperationForKey:options:done:]</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">- (nullable NSOperation *)queryCacheOperationForKey:(nullable NSString *)key options:(SDImageCacheOptions)options done:(nullable SDCacheQueryCompletedBlock)doneBlock</td></tr>
+<tr><th>To</th><td class="declaration">- (nullable NSOperation *)queryCacheOperationForKey:(nullable NSString *)key options:(SDImageCacheOptions)options done:(nullable SDImageCacheQueryCompletionBlock)doneBlock</td></tr>
+</table>
+<br>
+<div class="difference"><span class="status modified">Modified</span> -[SDImageCache calculateSizeWithCompletionBlock:]</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">- (void)calculateSizeWithCompletionBlock:(nullable SDWebImageCalculateSizeBlock)completionBlock</td></tr>
+<tr><th>To</th><td class="declaration">- (void)calculateSizeWithCompletionBlock:(nullable SDImageCacheCalculateSizeBlock)completionBlock</td></tr>
+</table>
+<br>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDImageCacheConfig.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status removed">Removed</span> SDImageCacheConfig.shouldDecompressImages</div>
+<div class="difference"><span class="status removed">Removed</span> SDImageCacheConfig.maxCacheAge</div>
+<div class="difference"><span class="status removed">Removed</span> SDImageCacheConfig.maxCacheSize</div>
+</div>
+
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDImageCacheConfig.defaultCacheConfig</div>
+<div class="difference"><span class="status added">Added</span> SDImageCacheConfig.shouldRemoveExpiredDataWhenEnterBackground</div>
+<div class="difference"><span class="status added">Added</span> SDImageCacheConfig.maxDiskAge</div>
+<div class="difference"><span class="status added">Added</span> SDImageCacheConfig.maxDiskSize</div>
+<div class="difference"><span class="status added">Added</span> SDImageCacheConfig.maxMemoryCost</div>
+<div class="difference"><span class="status added">Added</span> SDImageCacheConfig.maxMemoryCount</div>
+<div class="difference"><span class="status added">Added</span> SDImageCacheConfig.fileManager</div>
+<div class="difference"><span class="status added">Added</span> SDImageCacheConfig.memoryCacheClass</div>
+<div class="difference"><span class="status added">Added</span> SDImageCacheConfig.diskCacheClass</div>
+</div>
+
+
+<div class="differenceGroup">
+<div class="difference"><span class="status modified">Modified</span> SDImageCacheConfig</div>
+<table>
+<tr><th></th><th>Protocols</th></tr>
+<tr><th>From</th><td><em>none</em></td></tr>
+<tr><th>To</th><td>NSCopying</td></tr>
+</table>
+<br>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDImageCacheDefine.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDImageCacheTypeAll</div>
+<div class="difference"><span class="status added">Added</span> SDImageCacheCheckCompletionBlock</div>
+<div class="difference"><span class="status added">Added</span> SDImageCacheCalculateSizeBlock</div>
+<div class="difference"><span class="status added">Added</span> SDImageCacheAdditionalCachePathBlock</div>
+<div class="difference"><span class="status added">Added</span> SDImageCacheQueryCompletionBlock</div>
+<div class="difference"><span class="status added">Added</span> SDImageCacheContainsCompletionBlock</div>
+<div class="difference"><span class="status added">Added</span> SDImageCacheDecodeImageData()</div>
+<div class="difference"><span class="status added">Added</span> SDImageCache</div>
+<div class="difference"><span class="status added">Added</span> -[SDImageCache queryImageForKey:options:context:completion:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDImageCache storeImage:imageData:forKey:cacheType:completion:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDImageCache removeImageForKey:cacheType:completion:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDImageCache containsImageForKey:cacheType:completion:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDImageCache clearWithCacheType:completion:]</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDImageCachesManager.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDImageCachesManagerOperationPolicy</div>
+<div class="difference"><span class="status added">Added</span> SDImageCachesManagerOperationPolicySerial</div>
+<div class="difference"><span class="status added">Added</span> SDImageCachesManagerOperationPolicyConcurrent</div>
+<div class="difference"><span class="status added">Added</span> SDImageCachesManagerOperationPolicyHighestOnly</div>
+<div class="difference"><span class="status added">Added</span> SDImageCachesManagerOperationPolicyLowestOnly</div>
+<div class="difference"><span class="status added">Added</span> SDImageCachesManager</div>
+<div class="difference"><span class="status added">Added</span> SDImageCachesManager.sharedManager</div>
+<div class="difference"><span class="status added">Added</span> SDImageCachesManager.queryOperationPolicy</div>
+<div class="difference"><span class="status added">Added</span> SDImageCachesManager.storeOperationPolicy</div>
+<div class="difference"><span class="status added">Added</span> SDImageCachesManager.removeOperationPolicy</div>
+<div class="difference"><span class="status added">Added</span> SDImageCachesManager.containsOperationPolicy</div>
+<div class="difference"><span class="status added">Added</span> SDImageCachesManager.clearOperationPolicy</div>
+<div class="difference"><span class="status added">Added</span> SDImageCachesManager.caches</div>
+<div class="difference"><span class="status added">Added</span> -[SDImageCachesManager addCache:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDImageCachesManager removeCache:]</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDImageCoder.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDImageCoderOption</div>
+<div class="difference"><span class="status added">Added</span> SDImageCoderOptions</div>
+<div class="difference"><span class="status added">Added</span> SDImageCoderMutableOptions</div>
+<div class="difference"><span class="status added">Added</span> SDImageCoderDecodeFirstFrameOnly</div>
+<div class="difference"><span class="status added">Added</span> SDImageCoderDecodeScaleFactor</div>
+<div class="difference"><span class="status added">Added</span> SDImageCoderEncodeFirstFrameOnly</div>
+<div class="difference"><span class="status added">Added</span> SDImageCoderEncodeCompressionQuality</div>
+<div class="difference"><span class="status added">Added</span> SDImageCoderWebImageContext</div>
+<div class="difference"><span class="status added">Added</span> SDImageCoder</div>
+<div class="difference"><span class="status added">Added</span> -[SDImageCoder canDecodeFromData:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDImageCoder decodedImageWithData:options:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDImageCoder canEncodeToFormat:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDImageCoder encodedDataWithImage:format:options:]</div>
+<div class="difference"><span class="status added">Added</span> SDProgressiveImageCoder</div>
+<div class="difference"><span class="status added">Added</span> -[SDProgressiveImageCoder canIncrementalDecodeFromData:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDProgressiveImageCoder initIncrementalWithOptions:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDProgressiveImageCoder updateIncrementalData:finished:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDProgressiveImageCoder incrementalDecodedImageWithOptions:]</div>
+<div class="difference"><span class="status added">Added</span> SDAnimatedImageProvider</div>
+<div class="difference"><span class="status added">Added</span> SDAnimatedImageProvider.animatedImageData</div>
+<div class="difference"><span class="status added">Added</span> SDAnimatedImageProvider.animatedImageFrameCount</div>
+<div class="difference"><span class="status added">Added</span> SDAnimatedImageProvider.animatedImageLoopCount</div>
+<div class="difference"><span class="status added">Added</span> -[SDAnimatedImageProvider animatedImageFrameAtIndex:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDAnimatedImageProvider animatedImageDurationAtIndex:]</div>
+<div class="difference"><span class="status added">Added</span> SDAnimatedImageCoder</div>
+<div class="difference"><span class="status added">Added</span> -[SDAnimatedImageCoder initWithAnimatedImageData:options:]</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDImageCoderHelper.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDImageCoderHelper</div>
+<div class="difference"><span class="status added">Added</span> +[SDImageCoderHelper animatedImageWithFrames:]</div>
+<div class="difference"><span class="status added">Added</span> +[SDImageCoderHelper framesFromAnimatedImage:]</div>
+<div class="difference"><span class="status added">Added</span> +[SDImageCoderHelper colorSpaceGetDeviceRGB]</div>
+<div class="difference"><span class="status added">Added</span> +[SDImageCoderHelper CGImageContainsAlpha:]</div>
+<div class="difference"><span class="status added">Added</span> +[SDImageCoderHelper CGImageCreateDecoded:]</div>
+<div class="difference"><span class="status added">Added</span> +[SDImageCoderHelper CGImageCreateDecoded:orientation:]</div>
+<div class="difference"><span class="status added">Added</span> +[SDImageCoderHelper decodedImageWithImage:]</div>
+<div class="difference"><span class="status added">Added</span> +[SDImageCoderHelper decodedAndScaledDownImageWithImage:limitBytes:]</div>
+<div class="difference"><span class="status added">Added</span> +[SDImageCoderHelper imageOrientationFromEXIFOrientation:]</div>
+<div class="difference"><span class="status added">Added</span> +[SDImageCoderHelper exifOrientationFromImageOrientation:]</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDImageCodersManager.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDImageCodersManager</div>
+<div class="difference"><span class="status added">Added</span> SDImageCodersManager.sharedManager</div>
+<div class="difference"><span class="status added">Added</span> SDImageCodersManager.coders</div>
+<div class="difference"><span class="status added">Added</span> -[SDImageCodersManager addCoder:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDImageCodersManager removeCoder:]</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDImageFrame.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDImageFrame</div>
+<div class="difference"><span class="status added">Added</span> SDImageFrame.image</div>
+<div class="difference"><span class="status added">Added</span> SDImageFrame.duration</div>
+<div class="difference"><span class="status added">Added</span> +[SDImageFrame frameWithImage:duration:]</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDImageGIFCoder.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDImageGIFCoder</div>
+<div class="difference"><span class="status added">Added</span> SDImageGIFCoder.sharedCoder</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDImageGraphics.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDGraphicsGetCurrentContext()</div>
+<div class="difference"><span class="status added">Added</span> SDGraphicsBeginImageContext()</div>
+<div class="difference"><span class="status added">Added</span> SDGraphicsBeginImageContextWithOptions()</div>
+<div class="difference"><span class="status added">Added</span> SDGraphicsEndImageContext()</div>
+<div class="difference"><span class="status added">Added</span> SDGraphicsGetImageFromCurrentImageContext()</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDImageIOCoder.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDImageIOCoder</div>
+<div class="difference"><span class="status added">Added</span> SDImageIOCoder.sharedCoder</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDImageLoader.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDImageLoaderProgressBlock</div>
+<div class="difference"><span class="status added">Added</span> SDImageLoaderCompletedBlock</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageContextLoaderCachedImage</div>
+<div class="difference"><span class="status added">Added</span> SDImageLoaderDecodeImageData()</div>
+<div class="difference"><span class="status added">Added</span> SDImageLoaderDecodeProgressiveImageData()</div>
+<div class="difference"><span class="status added">Added</span> SDImageLoader</div>
+<div class="difference"><span class="status added">Added</span> -[SDImageLoader canRequestImageForURL:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDImageLoader requestImageWithURL:options:context:progress:completed:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDImageLoader shouldBlockFailedURLWithURL:error:]</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDImageLoadersManager.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDImageLoadersManager</div>
+<div class="difference"><span class="status added">Added</span> SDImageLoadersManager.sharedManager</div>
+<div class="difference"><span class="status added">Added</span> SDImageLoadersManager.loaders</div>
+<div class="difference"><span class="status added">Added</span> -[SDImageLoadersManager addLoader:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDImageLoadersManager removeLoader:]</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDImageTransformer.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDTransformedKeyForKey()</div>
+<div class="difference"><span class="status added">Added</span> SDImageTransformer</div>
+<div class="difference"><span class="status added">Added</span> SDImageTransformer.transformerKey</div>
+<div class="difference"><span class="status added">Added</span> -[SDImageTransformer transformedImageWithImage:forKey:]</div>
+<div class="difference"><span class="status added">Added</span> SDImagePipelineTransformer</div>
+<div class="difference"><span class="status added">Added</span> SDImagePipelineTransformer.transformers</div>
+<div class="difference"><span class="status added">Added</span> +[SDImagePipelineTransformer transformerWithTransformers:]</div>
+<div class="difference"><span class="status added">Added</span> SDImageRoundCornerTransformer</div>
+<div class="difference"><span class="status added">Added</span> SDImageRoundCornerTransformer.cornerRadius</div>
+<div class="difference"><span class="status added">Added</span> SDImageRoundCornerTransformer.corners</div>
+<div class="difference"><span class="status added">Added</span> SDImageRoundCornerTransformer.borderWidth</div>
+<div class="difference"><span class="status added">Added</span> SDImageRoundCornerTransformer.borderColor</div>
+<div class="difference"><span class="status added">Added</span> +[SDImageRoundCornerTransformer transformerWithRadius:corners:borderWidth:borderColor:]</div>
+<div class="difference"><span class="status added">Added</span> SDImageResizingTransformer</div>
+<div class="difference"><span class="status added">Added</span> SDImageResizingTransformer.size</div>
+<div class="difference"><span class="status added">Added</span> SDImageResizingTransformer.scaleMode</div>
+<div class="difference"><span class="status added">Added</span> +[SDImageResizingTransformer transformerWithSize:scaleMode:]</div>
+<div class="difference"><span class="status added">Added</span> SDImageCroppingTransformer</div>
+<div class="difference"><span class="status added">Added</span> SDImageCroppingTransformer.rect</div>
+<div class="difference"><span class="status added">Added</span> +[SDImageCroppingTransformer transformerWithRect:]</div>
+<div class="difference"><span class="status added">Added</span> SDImageFlippingTransformer</div>
+<div class="difference"><span class="status added">Added</span> SDImageFlippingTransformer.horizontal</div>
+<div class="difference"><span class="status added">Added</span> SDImageFlippingTransformer.vertical</div>
+<div class="difference"><span class="status added">Added</span> +[SDImageFlippingTransformer transformerWithHorizontal:vertical:]</div>
+<div class="difference"><span class="status added">Added</span> SDImageRotationTransformer</div>
+<div class="difference"><span class="status added">Added</span> SDImageRotationTransformer.angle</div>
+<div class="difference"><span class="status added">Added</span> SDImageRotationTransformer.fitSize</div>
+<div class="difference"><span class="status added">Added</span> +[SDImageRotationTransformer transformerWithAngle:fitSize:]</div>
+<div class="difference"><span class="status added">Added</span> SDImageTintTransformer</div>
+<div class="difference"><span class="status added">Added</span> SDImageTintTransformer.tintColor</div>
+<div class="difference"><span class="status added">Added</span> +[SDImageTintTransformer transformerWithColor:]</div>
+<div class="difference"><span class="status added">Added</span> SDImageBlurTransformer</div>
+<div class="difference"><span class="status added">Added</span> SDImageBlurTransformer.blurRadius</div>
+<div class="difference"><span class="status added">Added</span> +[SDImageBlurTransformer transformerWithRadius:]</div>
+<div class="difference"><span class="status added">Added</span> SDImageFilterTransformer</div>
+<div class="difference"><span class="status added">Added</span> SDImageFilterTransformer.filter</div>
+<div class="difference"><span class="status added">Added</span> +[SDImageFilterTransformer transformerWithFilter:]</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDMemoryCache.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDMemoryCache</div>
+<div class="difference"><span class="status added">Added</span> -[SDMemoryCache initWithConfig:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDMemoryCache objectForKey:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDMemoryCache setObject:forKey:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDMemoryCache setObject:forKey:cost:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDMemoryCache removeObjectForKey:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDMemoryCache removeAllObjects]</div>
+<div class="difference"><span class="status added">Added</span> SDMemoryCache</div>
+<div class="difference"><span class="status added">Added</span> SDMemoryCache.config</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDWebImageCacheKeyFilter.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDWebImageCacheKeyFilter</div>
+<div class="difference"><span class="status added">Added</span> -[SDWebImageCacheKeyFilter cacheKeyForURL:]</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageCacheKeyFilter</div>
+<div class="difference"><span class="status added">Added</span> -[SDWebImageCacheKeyFilter initWithBlock:]</div>
+<div class="difference"><span class="status added">Added</span> +[SDWebImageCacheKeyFilter cacheKeyFilterWithBlock:]</div>
+</div>
+
+
+<div class="differenceGroup">
+<div class="difference"><span class="status modified">Modified</span> SDWebImageCacheKeyFilterBlock</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">typedef NSString * _Nullable (^SDWebImageCacheKeyFilterBlock)(NSURL * _Nullable url)</td></tr>
+<tr><th>To</th><td class="declaration">typedef NSString * _Nullable (^SDWebImageCacheKeyFilterBlock)(NSURL * _Nonnull url)</td></tr>
+</table>
+<br>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDWebImageCacheSerializer.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDWebImageCacheSerializer</div>
+<div class="difference"><span class="status added">Added</span> -[SDWebImageCacheSerializer cacheDataWithImage:originalData:imageURL:]</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageCacheSerializer</div>
+<div class="difference"><span class="status added">Added</span> -[SDWebImageCacheSerializer initWithBlock:]</div>
+<div class="difference"><span class="status added">Added</span> +[SDWebImageCacheSerializer cacheSerializerWithBlock:]</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDWebImageCoder.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status removed">Removed</span> SDWebImageCoderScaleDownLargeImagesKey</div>
+<div class="difference"><span class="status removed">Removed</span> SDCGColorSpaceGetDeviceRGB()</div>
+<div class="difference"><span class="status removed">Removed</span> SDCGImageRefContainsAlpha()</div>
+<div class="difference"><span class="status removed">Removed</span> SDWebImageCoder</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDWebImageCoder canDecodeFromData:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDWebImageCoder decodedImageWithData:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDWebImageCoder decompressedImageWithImage:data:options:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDWebImageCoder canEncodeToFormat:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDWebImageCoder encodedDataWithImage:format:]</div>
+<div class="difference"><span class="status removed">Removed</span> SDWebImageProgressiveCoder</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDWebImageProgressiveCoder canIncrementallyDecodeFromData:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDWebImageProgressiveCoder incrementallyDecodedImageWithData:finished:]</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDWebImageCoderHelper.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status removed">Removed</span> SDWebImageCoderHelper</div>
+<div class="difference"><span class="status removed">Removed</span> +[SDWebImageCoderHelper animatedImageWithFrames:]</div>
+<div class="difference"><span class="status removed">Removed</span> +[SDWebImageCoderHelper framesFromAnimatedImage:]</div>
+<div class="difference"><span class="status removed">Removed</span> +[SDWebImageCoderHelper imageOrientationFromEXIFOrientation:]</div>
+<div class="difference"><span class="status removed">Removed</span> +[SDWebImageCoderHelper exifOrientationFromImageOrientation:]</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDWebImageCodersManager.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status removed">Removed</span> SDWebImageCodersManager</div>
+<div class="difference"><span class="status removed">Removed</span> +[SDWebImageCodersManager sharedInstance]</div>
+<div class="difference"><span class="status removed">Removed</span> SDWebImageCodersManager.coders</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDWebImageCodersManager addCoder:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDWebImageCodersManager removeCoder:]</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDWebImageCompat.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status removed">Removed</span> #def dispatch_queue_async_safe</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDWebImageDefine.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDWebImageContextOption</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageContext</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageMutableContext</div>
+<div class="difference"><span class="status added">Added</span> SDImageScaleFactorForKey()</div>
+<div class="difference"><span class="status added">Added</span> SDScaledImageForScaleFactor()</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageProgressiveLoad</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageQueryMemoryData</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageQueryMemoryDataSync</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageQueryDiskDataSync</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageFromLoaderOnly</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageAvoidDecodeImage</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageDecodeFirstFrameOnly</div>
+<div class="difference"><span class="status added">Added</span> SDWebImagePreloadAllFrames</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageContextSetImageOperationKey</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageContextCustomManager</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageContextImageTransformer</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageContextImageScaleFactor</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageContextStoreCacheType</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageContextAnimatedImageClass</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageContextDownloadRequestModifier</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageContextCacheKeyFilter</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageContextCacheSerializer</div>
+</div>
+
+
+<div class="differenceGroup">
+<div class="difference"><span class="status modified">Modified</span> SDScaledImageForKey()</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">UIImage *SDScaledImageForKey(NSString *key, UIImage *image)</td></tr>
+<tr><th>To</th><td class="declaration">UIImage * _Nullable SDScaledImageForKey(NSString * _Nullable key, UIImage * _Nullable image)</td></tr>
+</table>
+<br>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDWebImageDownloader.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status removed">Removed</span> SDWebImageDownloaderProgressiveDownload</div>
+<div class="difference"><span class="status removed">Removed</span> SDHTTPHeadersDictionary</div>
+<div class="difference"><span class="status removed">Removed</span> SDHTTPHeadersMutableDictionary</div>
+<div class="difference"><span class="status removed">Removed</span> SDWebImageDownloaderHeadersFilterBlock</div>
+<div class="difference"><span class="status removed">Removed</span> SDWebImageDownloadToken.downloadOperationCancelToken</div>
+<div class="difference"><span class="status removed">Removed</span> SDWebImageDownloader.shouldDecompressImages</div>
+<div class="difference"><span class="status removed">Removed</span> SDWebImageDownloader.maxConcurrentDownloads</div>
+<div class="difference"><span class="status removed">Removed</span> SDWebImageDownloader.downloadTimeout</div>
+<div class="difference"><span class="status removed">Removed</span> SDWebImageDownloader.executionOrder</div>
+<div class="difference"><span class="status removed">Removed</span> SDWebImageDownloader.urlCredential</div>
+<div class="difference"><span class="status removed">Removed</span> SDWebImageDownloader.username</div>
+<div class="difference"><span class="status removed">Removed</span> SDWebImageDownloader.password</div>
+<div class="difference"><span class="status removed">Removed</span> SDWebImageDownloader.headersFilter</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDWebImageDownloader initWithSessionConfiguration:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDWebImageDownloader setOperationClass:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDWebImageDownloader cancel:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDWebImageDownloader createNewSessionWithConfiguration:]</div>
+</div>
+
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDWebImageDownloaderProgressiveLoad</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageDownloaderAvoidDecodeImage</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageDownloaderDecodeFirstFrameOnly</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageDownloaderPreloadAllFrames</div>
+<div class="difference"><span class="status added">Added</span> -[SDWebImageDownloadToken cancel]</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageDownloadToken.request</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageDownloadToken.response</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageDownloader.config</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageDownloader.requestModifier</div>
+<div class="difference"><span class="status added">Added</span> -[SDWebImageDownloader initWithConfig:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDWebImageDownloader downloadImageWithURL:completed:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDWebImageDownloader downloadImageWithURL:options:context:progress:completed:]</div>
+</div>
+
+
+<div class="differenceGroup">
+<div class="difference"><span class="status modified">Modified</span> SDWebImageDownloadStartNotification</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">NSString *const _Nonnull SDWebImageDownloadStartNotification</td></tr>
+<tr><th>To</th><td class="declaration">NSNotificationName  _Nonnull const SDWebImageDownloadStartNotification</td></tr>
+</table>
+<br>
+<div class="difference"><span class="status modified">Modified</span> SDWebImageDownloadReceiveResponseNotification</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">NSString *const _Nonnull SDWebImageDownloadReceiveResponseNotification</td></tr>
+<tr><th>To</th><td class="declaration">NSNotificationName  _Nonnull const SDWebImageDownloadReceiveResponseNotification</td></tr>
+</table>
+<br>
+<div class="difference"><span class="status modified">Modified</span> SDWebImageDownloadStopNotification</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">NSString *const _Nonnull SDWebImageDownloadStopNotification</td></tr>
+<tr><th>To</th><td class="declaration">NSNotificationName  _Nonnull const SDWebImageDownloadStopNotification</td></tr>
+</table>
+<br>
+<div class="difference"><span class="status modified">Modified</span> SDWebImageDownloadFinishNotification</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">NSString *const _Nonnull SDWebImageDownloadFinishNotification</td></tr>
+<tr><th>To</th><td class="declaration">NSNotificationName  _Nonnull const SDWebImageDownloadFinishNotification</td></tr>
+</table>
+<br>
+<div class="difference"><span class="status modified">Modified</span> SDWebImageDownloaderProgressBlock</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">typedef void (^SDWebImageDownloaderProgressBlock)(NSInteger receivedSize, NSInteger expectedSize, NSURL * _Nullable targetURL)</td></tr>
+<tr><th>To</th><td class="declaration">typedef SDWebImageDownloaderProgressBlock SDWebImageDownloaderProgressBlock</td></tr>
+</table>
+<br>
+<div class="difference"><span class="status modified">Modified</span> SDWebImageDownloaderCompletedBlock</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">typedef void (^SDWebImageDownloaderCompletedBlock)(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished)</td></tr>
+<tr><th>To</th><td class="declaration">typedef SDWebImageDownloaderCompletedBlock SDWebImageDownloaderCompletedBlock</td></tr>
+</table>
+<br>
+<div class="difference"><span class="status modified">Modified</span> SDWebImageDownloadToken.url</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">@property (nonatomic, strong, nullable) NSURL *url</td></tr>
+<tr><th>To</th><td class="declaration">@property (nonatomic, readonly, strong, nullable) NSURL *url</td></tr>
+</table>
+<br>
+<div class="difference"><span class="status modified">Modified</span> SDWebImageDownloader</div>
+<table>
+<tr><th></th><th>Protocols</th></tr>
+<tr><th>From</th><td><em>none</em></td></tr>
+<tr><th>To</th><td>SDImageLoader</td></tr>
+</table>
+<br>
+<div class="difference"><span class="status modified">Modified</span> -[SDWebImageDownloader setSuspended:]</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">- (void)setSuspended:(BOOL)suspended</td></tr>
+<tr><th>To</th><td class="declaration">@property (nonatomic, assign, getter=isSuspended) BOOL suspended</td></tr>
+</table>
+<br>
+<div class="difference"><span class="status modified">Modified</span> SDWebImageDownloader.currentDownloadCount</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">@property (nonatomic, readonly) NSUInteger currentDownloadCount</td></tr>
+<tr><th>To</th><td class="declaration">@property (nonatomic, readonly, assign) NSUInteger currentDownloadCount</td></tr>
+</table>
+<br>
+<div class="difference"><span class="status modified">Modified</span> +[SDWebImageDownloader sharedDownloader]</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">+ (nonnull instancetype)sharedDownloader</td></tr>
+<tr><th>To</th><td class="declaration">@property (class, nonatomic, readonly, nonnull) SDWebImageDownloader *sharedDownloader</td></tr>
+</table>
+<br>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDWebImageDownloaderConfig.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDWebImageDownloaderConfig</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageDownloaderConfig.defaultDownloaderConfig</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageDownloaderConfig.maxConcurrentDownloads</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageDownloaderConfig.downloadTimeout</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageDownloaderConfig.minimumProgressInterval</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageDownloaderConfig.sessionConfiguration</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageDownloaderConfig.operationClass</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageDownloaderConfig.executionOrder</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageDownloaderConfig.urlCredential</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageDownloaderConfig.username</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageDownloaderConfig.password</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDWebImageDownloaderOperation.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status removed">Removed</span> SDWebImageDownloaderOperationInterface</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDWebImageDownloaderOperationInterface initWithRequest:inSession:options:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDWebImageDownloaderOperationInterface addHandlersForProgress:completed:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDWebImageDownloaderOperationInterface shouldDecompressImages]</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDWebImageDownloaderOperationInterface setShouldDecompressImages:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDWebImageDownloaderOperationInterface credential]</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDWebImageDownloaderOperationInterface setCredential:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDWebImageDownloaderOperationInterface cancel:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDWebImageDownloaderOperationInterface dataTask]</div>
+<div class="difference"><span class="status removed">Removed</span> SDWebImageDownloaderOperation.shouldDecompressImages</div>
+<div class="difference"><span class="status removed">Removed</span> SDWebImageDownloaderOperation.shouldUseCredentialStorage</div>
+<div class="difference"><span class="status removed">Removed</span> SDWebImageDownloaderOperation.expectedSize</div>
+</div>
+
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDWebImageDownloaderOperation</div>
+<div class="difference"><span class="status added">Added</span> -[SDWebImageDownloaderOperation initWithRequest:inSession:options:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDWebImageDownloaderOperation initWithRequest:inSession:options:context:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDWebImageDownloaderOperation addHandlersForProgress:completed:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDWebImageDownloaderOperation cancel:]</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageDownloaderOperation.request</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageDownloaderOperation.response</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageDownloaderOperation.dataTask</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageDownloaderOperation.credential</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageDownloaderOperation.minimumProgressInterval</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageDownloaderOperation.minimumProgressInterval</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageDownloaderOperation.context</div>
+<div class="difference"><span class="status added">Added</span> -[SDWebImageDownloaderOperation initWithRequest:inSession:options:context:]</div>
+</div>
+
+
+<div class="differenceGroup">
+<div class="difference"><span class="status modified">Modified</span> SDWebImageDownloaderOperation</div>
+<table>
+<tr><th></th><th>Protocols</th></tr>
+<tr><th>From</th><td>SDWebImageDownloaderOperationInterface, SDWebImageOperation</td></tr>
+<tr><th>To</th><td>SDWebImageDownloaderOperation</td></tr>
+</table>
+<br>
+<div class="difference"><span class="status modified">Modified</span> SDWebImageDownloaderOperation.response</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">@property (nonatomic, strong, nullable) NSURLResponse *response</td></tr>
+<tr><th>To</th><td class="declaration">@property (nonatomic, readonly, strong, nullable) NSURLResponse *response</td></tr>
+</table>
+<br>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDWebImageDownloaderRequestModifier.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDWebImageDownloaderRequestModifierBlock</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageDownloaderRequestModifier</div>
+<div class="difference"><span class="status added">Added</span> -[SDWebImageDownloaderRequestModifier modifiedRequestWithRequest:]</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageDownloaderRequestModifier</div>
+<div class="difference"><span class="status added">Added</span> -[SDWebImageDownloaderRequestModifier initWithBlock:]</div>
+<div class="difference"><span class="status added">Added</span> +[SDWebImageDownloaderRequestModifier requestModifierWithBlock:]</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDWebImageError.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDWebImageErrorDownloadStatusCodeKey</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageError</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageErrorInvalidURL</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageErrorBadImageData</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageErrorCacheNotModified</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageErrorInvalidDownloadOperation</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageErrorInvalidDownloadStatusCode</div>
+</div>
+
+
+<div class="differenceGroup">
+<div class="difference"><span class="status modified">Modified</span> SDWebImageErrorDomain</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">NSString *const SDWebImageErrorDomain</td></tr>
+<tr><th>To</th><td class="declaration">NSErrorDomain  _Nonnull const SDWebImageErrorDomain</td></tr>
+</table>
+<br>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDWebImageFrame.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status removed">Removed</span> SDWebImageFrame</div>
+<div class="difference"><span class="status removed">Removed</span> SDWebImageFrame.image</div>
+<div class="difference"><span class="status removed">Removed</span> SDWebImageFrame.duration</div>
+<div class="difference"><span class="status removed">Removed</span> +[SDWebImageFrame frameWithImage:duration:]</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDWebImageGIFCoder.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status removed">Removed</span> SDWebImageGIFCoder</div>
+<div class="difference"><span class="status removed">Removed</span> +[SDWebImageGIFCoder sharedCoder]</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDWebImageImageIOCoder.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status removed">Removed</span> SDWebImageImageIOCoder</div>
+<div class="difference"><span class="status removed">Removed</span> +[SDWebImageImageIOCoder sharedCoder]</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDWebImageIndicator.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDWebImageIndicator</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageIndicator.indicatorView</div>
+<div class="difference"><span class="status added">Added</span> -[SDWebImageIndicator startAnimatingIndicator]</div>
+<div class="difference"><span class="status added">Added</span> -[SDWebImageIndicator stopAnimatingIndicator]</div>
+<div class="difference"><span class="status added">Added</span> -[SDWebImageIndicator updateIndicatorProgress:]</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageActivityIndicator</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageActivityIndicator.indicatorView</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageActivityIndicator.grayIndicator</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageActivityIndicator.grayLargeIndicator</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageActivityIndicator.whiteIndicator</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageActivityIndicator.whiteLargeIndicator</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageProgressIndicator</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageProgressIndicator.indicatorView</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageProgressIndicator.defaultIndicator</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageProgressIndicator.barIndicator</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDWebImageManager.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status removed">Removed</span> SDWebImageCacheMemoryOnly</div>
+<div class="difference"><span class="status removed">Removed</span> SDWebImageProgressiveDownload</div>
+<div class="difference"><span class="status removed">Removed</span> SDWebImageQueryDataWhenInMemory</div>
+<div class="difference"><span class="status removed">Removed</span> SDWebImageQueryDiskSync</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDWebImageManagerDelegate imageManager:transformDownloadedImage:withURL:]</div>
+<div class="difference"><span class="status removed">Removed</span> SDWebImageManager.imageDownloader</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDWebImageManager initWithCache:downloader:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDWebImageManager saveImageToCache:forURL:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDWebImageManager cachedImageExistsForURL:completion:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[SDWebImageManager diskImageExistsForURL:completion:]</div>
+</div>
+
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDWebImageCombinedOperation</div>
+<div class="difference"><span class="status added">Added</span> -[SDWebImageCombinedOperation cancel]</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageCombinedOperation.cacheOperation</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageCombinedOperation.loaderOperation</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageManager.imageLoader</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageManager.transformer</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageManager.defaultImageCache</div>
+<div class="difference"><span class="status added">Added</span> SDWebImageManager.defaultImageLoader</div>
+<div class="difference"><span class="status added">Added</span> -[SDWebImageManager initWithCache:loader:]</div>
+<div class="difference"><span class="status added">Added</span> -[SDWebImageManager loadImageWithURL:options:context:progress:completed:]</div>
+</div>
+
+
+<div class="differenceGroup">
+<div class="difference"><span class="status modified">Modified</span> -[SDWebImageManagerDelegate imageManager:shouldDownloadImageForURL:]</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">- (BOOL)imageManager:(nonnull SDWebImageManager *)imageManager shouldDownloadImageForURL:(nullable NSURL *)imageURL</td></tr>
+<tr><th>To</th><td class="declaration">- (BOOL)imageManager:(nonnull SDWebImageManager *)imageManager shouldDownloadImageForURL:(nonnull NSURL *)imageURL</td></tr>
+</table>
+<br>
+<div class="difference"><span class="status modified">Modified</span> SDWebImageManager.imageCache</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">@property (nonatomic, readonly, strong, nullable) SDImageCache *imageCache</td></tr>
+<tr><th>To</th><td class="declaration">@property (nonatomic, readonly, strong, nonnull) id&lt;SDImageCache&gt; imageCache</td></tr>
+</table>
+<br>
+<div class="difference"><span class="status modified">Modified</span> SDWebImageManager.cacheKeyFilter</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">@property (nonatomic, copy, nullable) SDWebImageCacheKeyFilterBlock cacheKeyFilter</td></tr>
+<tr><th>To</th><td class="declaration">@property (nonatomic, strong, nullable) id&lt;SDWebImageCacheKeyFilter&gt; cacheKeyFilter</td></tr>
+</table>
+<br>
+<div class="difference"><span class="status modified">Modified</span> SDWebImageManager.cacheSerializer</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">@property (nonatomic, copy, nullable) SDWebImageCacheSerializerBlock cacheSerializer</td></tr>
+<tr><th>To</th><td class="declaration">@property (nonatomic, strong, nullable) id&lt;SDWebImageCacheSerializer&gt; cacheSerializer</td></tr>
+</table>
+<br>
+<div class="difference"><span class="status modified">Modified</span> -[SDWebImageManager isRunning]</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">- (BOOL)isRunning</td></tr>
+<tr><th>To</th><td class="declaration">@property (nonatomic, readonly, assign, getter=isRunning) BOOL running</td></tr>
+</table>
+<br>
+<div class="difference"><span class="status modified">Modified</span> +[SDWebImageManager sharedManager]</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">+ (nonnull instancetype)sharedManager</td></tr>
+<tr><th>To</th><td class="declaration">@property (class, nonatomic, readonly, nonnull) SDWebImageManager *sharedManager</td></tr>
+</table>
+<br>
+<div class="difference"><span class="status modified">Modified</span> -[SDWebImageManager loadImageWithURL:options:progress:completed:]</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">- (nullable id&lt;SDWebImageOperation&gt;)loadImageWithURL:(nullable NSURL *)url options:(SDWebImageOptions)options progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock completed:(nullable SDInternalCompletionBlock)completedBlock</td></tr>
+<tr><th>To</th><td class="declaration">- (nullable SDWebImageCombinedOperation *)loadImageWithURL:(nullable NSURL *)url options:(SDWebImageOptions)options progress:(nullable SDImageLoaderProgressBlock)progressBlock completed:(nonnull SDInternalCompletionBlock)completedBlock</td></tr>
+</table>
+<br>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDWebImageOperation.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> NSOperation (SDWebImageOperation)</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">SDWebImagePrefetcher.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status removed">Removed</span> SDWebImagePrefetcher.maxConcurrentDownloads</div>
+<div class="difference"><span class="status removed">Removed</span> SDWebImagePrefetcher.prefetcherQueue</div>
+</div>
+
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDWebImagePrefetchToken</div>
+<div class="difference"><span class="status added">Added</span> -[SDWebImagePrefetchToken cancel]</div>
+<div class="difference"><span class="status added">Added</span> SDWebImagePrefetchToken.urls</div>
+<div class="difference"><span class="status added">Added</span> SDWebImagePrefetcher.maxConcurrentPrefetchCount</div>
+<div class="difference"><span class="status added">Added</span> SDWebImagePrefetcher.context</div>
+<div class="difference"><span class="status added">Added</span> SDWebImagePrefetcher.delegateQueue</div>
+</div>
+
+
+<div class="differenceGroup">
+<div class="difference"><span class="status modified">Modified</span> +[SDWebImagePrefetcher sharedImagePrefetcher]</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">+ (nonnull instancetype)sharedImagePrefetcher</td></tr>
+<tr><th>To</th><td class="declaration">@property (class, nonatomic, readonly, nonnull) SDWebImagePrefetcher *sharedImagePrefetcher</td></tr>
+</table>
+<br>
+<div class="difference"><span class="status modified">Modified</span> -[SDWebImagePrefetcher prefetchURLs:]</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">- (void)prefetchURLs:(nullable NSArray&lt;NSURL *&gt; *)urls</td></tr>
+<tr><th>To</th><td class="declaration">- (nullable SDWebImagePrefetchToken *)prefetchURLs:(nullable NSArray&lt;NSURL *&gt; *)urls</td></tr>
+</table>
+<br>
+<div class="difference"><span class="status modified">Modified</span> -[SDWebImagePrefetcher prefetchURLs:progress:completed:]</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">- (void)prefetchURLs:(nullable NSArray&lt;NSURL *&gt; *)urls progress:(nullable SDWebImagePrefetcherProgressBlock)progressBlock completed:(nullable SDWebImagePrefetcherCompletionBlock)completionBlock</td></tr>
+<tr><th>To</th><td class="declaration">- (nullable SDWebImagePrefetchToken *)prefetchURLs:(nullable NSArray&lt;NSURL *&gt; *)urls progress:(nullable SDWebImagePrefetcherProgressBlock)progressBlock completed:(nullable SDWebImagePrefetcherCompletionBlock)completionBlock</td></tr>
+</table>
+<br>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">UIButton+WebCache.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> -[UIButton sd_setImageWithURL:forState:placeholderImage:options:context:]</div>
+<div class="difference"><span class="status added">Added</span> -[UIButton sd_setImageWithURL:forState:placeholderImage:options:progress:completed:]</div>
+<div class="difference"><span class="status added">Added</span> -[UIButton sd_setImageWithURL:forState:placeholderImage:options:context:progress:completed:]</div>
+<div class="difference"><span class="status added">Added</span> -[UIButton sd_setBackgroundImageWithURL:forState:placeholderImage:options:context:]</div>
+<div class="difference"><span class="status added">Added</span> -[UIButton sd_setBackgroundImageWithURL:forState:placeholderImage:options:progress:completed:]</div>
+<div class="difference"><span class="status added">Added</span> -[UIButton sd_setBackgroundImageWithURL:forState:placeholderImage:options:context:progress:completed:]</div>
+</div>
+
+
+<div class="differenceGroup">
+<div class="difference"><span class="status modified">Modified</span> -[UIButton sd_currentImageURL]</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">- (nullable NSURL *)sd_currentImageURL</td></tr>
+<tr><th>To</th><td class="declaration">@property (nonatomic, readonly, strong, nullable) NSURL *sd_currentImageURL</td></tr>
+</table>
+<br>
+<div class="difference"><span class="status modified">Modified</span> -[UIButton sd_currentBackgroundImageURL]</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">- (nullable NSURL *)sd_currentBackgroundImageURL</td></tr>
+<tr><th>To</th><td class="declaration">@property (nonatomic, readonly, strong, nullable) NSURL *sd_currentBackgroundImageURL</td></tr>
+</table>
+<br>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">UIImage+ForceDecode.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status removed">Removed</span> +[UIImage decodedImageWithImage:]</div>
+<div class="difference"><span class="status removed">Removed</span> +[UIImage decodedAndScaledDownImageWithImage:]</div>
+</div>
+
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> UIImage.sd_isDecoded</div>
+<div class="difference"><span class="status added">Added</span> +[UIImage sd_decodedImageWithImage:]</div>
+<div class="difference"><span class="status added">Added</span> +[UIImage sd_decodedAndScaledDownImageWithImage:]</div>
+<div class="difference"><span class="status added">Added</span> +[UIImage sd_decodedAndScaledDownImageWithImage:limitBytes:]</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">UIImage+GIF.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status removed">Removed</span> +[UIImage sd_animatedGIFWithData:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[UIImage isGIF]</div>
+</div>
+
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> +[UIImage sd_imageWithGIFData:]</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">UIImage+Metadata.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> UIImage (Metadata)</div>
+<div class="difference"><span class="status added">Added</span> UIImage.sd_isAnimated</div>
+<div class="difference"><span class="status added">Added</span> UIImage.sd_isIncremental</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">UIImage+MultiFormat.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> +[UIImage sd_imageWithData:scale:]</div>
+<div class="difference"><span class="status added">Added</span> +[UIImage sd_imageWithData:scale:firstFrameOnly:]</div>
+<div class="difference"><span class="status added">Added</span> -[UIImage sd_imageDataAsFormat:compressionQuality:]</div>
+<div class="difference"><span class="status added">Added</span> -[UIImage sd_imageDataAsFormat:compressionQuality:firstFrameOnly:]</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">UIImage+Transform.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> SDImageScaleMode</div>
+<div class="difference"><span class="status added">Added</span> SDImageScaleModeFill</div>
+<div class="difference"><span class="status added">Added</span> SDImageScaleModeAspectFit</div>
+<div class="difference"><span class="status added">Added</span> SDImageScaleModeAspectFill</div>
+<div class="difference"><span class="status added">Added</span> SDRectCorner</div>
+<div class="difference"><span class="status added">Added</span> UIImage (Transform)</div>
+<div class="difference"><span class="status added">Added</span> -[UIImage sd_resizedImageWithSize:scaleMode:]</div>
+<div class="difference"><span class="status added">Added</span> -[UIImage sd_croppedImageWithRect:]</div>
+<div class="difference"><span class="status added">Added</span> -[UIImage sd_roundedCornerImageWithRadius:corners:borderWidth:borderColor:]</div>
+<div class="difference"><span class="status added">Added</span> -[UIImage sd_rotatedImageWithAngle:fitSize:]</div>
+<div class="difference"><span class="status added">Added</span> -[UIImage sd_flippedImageWithHorizontal:vertical:]</div>
+<div class="difference"><span class="status added">Added</span> -[UIImage sd_tintedImageWithColor:]</div>
+<div class="difference"><span class="status added">Added</span> -[UIImage sd_colorAtPoint:]</div>
+<div class="difference"><span class="status added">Added</span> -[UIImage sd_colorsWithRect:]</div>
+<div class="difference"><span class="status added">Added</span> -[UIImage sd_blurredImageWithRadius:]</div>
+<div class="difference"><span class="status added">Added</span> -[UIImage sd_filteredImageWithFilter:]</div>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">UIImageView+HighlightedWebCache.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> -[UIImageView sd_setHighlightedImageWithURL:options:context:]</div>
+<div class="difference"><span class="status added">Added</span> -[UIImageView sd_setHighlightedImageWithURL:options:context:progress:completed:]</div>
+</div>
+
+
+<div class="differenceGroup">
+<div class="difference"><span class="status modified">Modified</span> -[UIImageView sd_setHighlightedImageWithURL:options:progress:completed:]</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">- (void)sd_setHighlightedImageWithURL:(nullable NSURL *)url options:(SDWebImageOptions)options progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock completed:(nullable SDExternalCompletionBlock)completedBlock</td></tr>
+<tr><th>To</th><td class="declaration">- (void)sd_setHighlightedImageWithURL:(nullable NSURL *)url options:(SDWebImageOptions)options progress:(nullable SDImageLoaderProgressBlock)progressBlock completed:(nullable SDExternalCompletionBlock)completedBlock</td></tr>
+</table>
+<br>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">UIImageView+WebCache.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status removed">Removed</span> -[UIImageView sd_setImageWithPreviousCachedImageWithURL:placeholderImage:options:progress:completed:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[UIImageView sd_setAnimationImagesWithURLs:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[UIImageView sd_cancelCurrentAnimationImagesLoad]</div>
+</div>
+
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> -[UIImageView sd_setImageWithURL:placeholderImage:options:context:]</div>
+<div class="difference"><span class="status added">Added</span> -[UIImageView sd_setImageWithURL:placeholderImage:options:context:progress:completed:]</div>
+</div>
+
+
+<div class="differenceGroup">
+<div class="difference"><span class="status modified">Modified</span> -[UIImageView sd_setImageWithURL:placeholderImage:options:progress:completed:]</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock completed:(nullable SDExternalCompletionBlock)completedBlock</td></tr>
+<tr><th>To</th><td class="declaration">- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options progress:(nullable SDImageLoaderProgressBlock)progressBlock completed:(nullable SDExternalCompletionBlock)completedBlock</td></tr>
+</table>
+<br>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">UIView+WebCache.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status removed">Removed</span> SDWebImageInternalSetImageGroupKey</div>
+<div class="difference"><span class="status removed">Removed</span> SDWebImageExternalCustomManagerKey</div>
+<div class="difference"><span class="status removed">Removed</span> SDInternalSetImageBlock</div>
+<div class="difference"><span class="status removed">Removed</span> -[UIView sd_internalSetImageWithURL:placeholderImage:options:operationKey:setImageBlock:progress:completed:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[UIView sd_internalSetImageWithURL:placeholderImage:options:operationKey:setImageBlock:progress:completed:context:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[UIView sd_setShowActivityIndicatorView:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[UIView sd_setIndicatorStyle:]</div>
+<div class="difference"><span class="status removed">Removed</span> -[UIView sd_showActivityIndicatorView]</div>
+<div class="difference"><span class="status removed">Removed</span> -[UIView sd_addActivityIndicator]</div>
+<div class="difference"><span class="status removed">Removed</span> -[UIView sd_removeActivityIndicator]</div>
+</div>
+
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> -[UIView sd_internalSetImageWithURL:placeholderImage:options:context:setImageBlock:progress:completed:]</div>
+<div class="difference"><span class="status added">Added</span> UIView.sd_imageIndicator</div>
+</div>
+
+
+<div class="differenceGroup">
+<div class="difference"><span class="status modified">Modified</span> SDSetImageBlock</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">typedef void (^SDSetImageBlock)(UIImage * _Nullable image, NSData * _Nullable imageData)</td></tr>
+<tr><th>To</th><td class="declaration">typedef void (^SDSetImageBlock)(UIImage * _Nullable image, NSData * _Nullable imageData, SDImageCacheType cacheType, NSURL * _Nullable imageURL)</td></tr>
+</table>
+<br>
+<div class="difference"><span class="status modified">Modified</span> -[UIView sd_imageURL]</div>
+<table>
+<tr><th></th><th>Declaration</th></tr>
+<tr><th>From</th><td class="declaration">- (nullable NSURL *)sd_imageURL</td></tr>
+<tr><th>To</th><td class="declaration">@property (nonatomic, readonly, strong, nullable) NSURL *sd_imageURL</td></tr>
+</table>
+<br>
+</div>
+
+</div>
+
+<div class="headerFile">
+<div class="headerName">UIView+WebCacheOperation.h</div>
+
+<div class="differenceGroup">
+<div class="difference"><span class="status added">Added</span> -[UIView sd_imageLoadOperationForKey:]</div>
+</div>
+
+</div>
+</body>
+</html>
diff --git a/Docs/Diagrams/SDWebImage.mdj b/Docs/Diagrams/SDWebImage.mdj
new file mode 100644
index 000000000..b75ed9fe0
--- /dev/null
+++ b/Docs/Diagrams/SDWebImage.mdj
@@ -0,0 +1,92026 @@
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+								"$ref": "AAAAAAFk75N4ZH/eqek="
+							},
+							"stereotypeLabel": {
+								"$ref": "AAAAAAFk75N4ZH/fC+s="
+							},
+							"propertyLabel": {
+								"$ref": "AAAAAAFk75N4ZH/g4Gs="
+							}
+						}
+					]
+				}
+			],
+			"visibility": "public"
+		}
+	]
+}
\ No newline at end of file
diff --git a/Docs/Diagrams/SDWebImageCacheClassDiagram.png b/Docs/Diagrams/SDWebImageCacheClassDiagram.png
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diff --git a/Docs/Diagrams/SDWebImageManagerClassDiagram.png b/Docs/Diagrams/SDWebImageManagerClassDiagram.png
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diff --git a/Docs/Diagrams/SDWebImageSequenceDiagram.png b/Docs/Diagrams/SDWebImageSequenceDiagram.png
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diff --git a/Docs/Diagrams/SDWebImageTopLevelClassDiagram.png b/Docs/Diagrams/SDWebImageTopLevelClassDiagram.png
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diff --git a/Docs/HowToUse.md b/Docs/HowToUse.md
index bb4fb6ba0..492d06edf 100644
--- a/Docs/HowToUse.md
+++ b/Docs/HowToUse.md
@@ -57,7 +57,7 @@ Note: neither your success nor failure block will be call if your image request
 
 The `SDWebImageManager` is the class behind the `UIImageView(WebCache)` category. It ties the asynchronous downloader with the image cache store. You can use this class directly to benefit from web image downloading with caching in another context than a `UIView` (ie: with Cocoa).
 
-Note: When the image is from memory cache, it will not contains any `NSData` by default. However, if you need image data, you can pass `SDWebImageQueryDataWhenInMemory` in options arg.
+Note: When the image is from memory cache, it will not contain any `NSData` by default. However, if you need image data, you can pass `SDWebImageQueryDataWhenInMemory` in options arg.
 
 Here is a simple example of how to use `SDWebImageManager`:
 
@@ -95,11 +95,11 @@ SDWebImageDownloader *downloader = [SDWebImageDownloader sharedDownloader];
 
 ### Using Asynchronous Image Caching Independently
 
-It is also possible to use the async based image cache store independently. SDImageCache
+It is also possible to use the async based image cache store independently. `SDImageCache`
 maintains a memory cache and an optional disk cache. Disk cache write operations are performed
 asynchronous so it doesn't add unnecessary latency to the UI.
 
-The SDImageCache class provides a singleton instance for convenience but you can create your own
+The `SDImageCache` class provides a singleton instance for convenience but you can create your own
 instance if you want to create separated cache namespace.
 
 To lookup the cache, you use the `queryDiskCacheForKey:done:` method. If the method returns nil, it means the cache
@@ -114,10 +114,10 @@ SDImageCache *imageCache = [[SDImageCache alloc] initWithNamespace:@"myNamespace
 }];
 ```
 
-By default SDImageCache will lookup the disk cache if an image can't be found in the memory cache.
+By default `SDImageCache` will lookup the disk cache if an image can't be found in the memory cache.
 You can prevent this from happening by calling the alternative method `imageFromMemoryCacheForKey:`.
 
-To store an image into the cache, you use the storeImage:forKey:completion: method:
+To store an image into the cache, you use the `storeImage:forKey:completion:` method:
 
 ```objective-c
 [[SDImageCache sharedImageCache] storeImage:myImage forKey:myCacheKey completion:^{
@@ -126,14 +126,14 @@ To store an image into the cache, you use the storeImage:forKey:completion: meth
 ```
 
 By default, the image will be stored in memory cache as well as on disk cache (asynchronously). If
-you want only the memory cache, use the alternative method storeImage:forKey:toDisk:completion: with a negative
+you want only the memory cache, use the alternative method `storeImage:forKey:toDisk:completion:` with a negative
 third argument.
 
 ### Using cache key filter
 
 Sometime, you may not want to use the image URL as cache key because part of the URL is dynamic
-(i.e.: for access control purpose). SDWebImageManager provides a way to set a cache key filter that
-takes the NSURL as input, and output a cache key NSString.
+(i.e.: for access control purpose). `SDWebImageManager` provides a way to set a cache key filter that
+takes the `NSURL` as input, and output a cache key `NSString`.
 
 The following example sets a filter in the application delegate that will remove any query-string from
 the URL before to use it as a cache key:
diff --git a/Docs/ManualInstallation.md b/Docs/ManualInstallation.md
index ae059a627..199194ed6 100644
--- a/Docs/ManualInstallation.md
+++ b/Docs/ManualInstallation.md
@@ -1,33 +1,154 @@
-### Installation by cloning the repository
+## Manual Installation Guide
+
+### Build SDWebImage as Framework or Static Library
+
+For most user, to use SDWebImage, just need to build SDWebImage source code into a framework or static library.
+
+For framework, you can choose to use Dynamic Framework (Link during runtime) or Static Framework (Link to the main executable file like Static Library).
+
+It's strongly recommended to use Framework instead of Static Library. Framework can bundle resource and header files together, and have module map for clang module. Which make it easy to use.
+
+And more importantly, Swift can only import the Objective-C code by using modular framework, or using the Bridging Header. (Bridging header contains its own disadvantage but this is beyond the topic).
+
+#### Clone the repository:
 
-In order to gain access to all the files from the repository, you should clone it.
 ```
-git clone --recursive https://github.com/rs/SDWebImage.git
+git clone https://github.com/SDWebImage/SDWebImage.git
 ```
 
-... TO BE CHECKED AND DESCRIBED IN DETAIL
+Then open the `SDWebImage.xcodeproj`.
+
+#### Select the Build Scheme you need
+
+- `SDWebImage` for dynamic framework. You can also change the `Mach-O Type` to `Static Library` to build static framework in `Build Settings`.
+- `SDWebImage Static` for static library.
+- `SDWebImageMapKit` for MapKit sub component only.
 
-### Add dependencies
+#### Select Build Platform you need
 
-- In you application project app’s target settings, find the "Build Phases" section and open the "Link Binary With Libraries" block:
-- Click the "+" button again and select the "ImageIO.framework", this is needed by the progressive download feature:
+- `My Mac` for macOS platform.
+- `Generic iOS Device` for iOS platform.
+- `Generic tvOS Device` for tvOS platform.
+- `Generic watchOS Device` for watchOS platform.
+- Simulator Device for Simulator platform.
 
-### Add Linker Flag
+#### Prepare for archive
 
-Open the "Build Settings" tab, in the "Linking" section, locate the "Other Linker Flags" setting and add the "-ObjC" flag:
+If you want to build framework for Real Device, don't try to click `Build` (Command + R). Because by default it will use the `DEBUG` configuration, which is not suitable for production. It's mostly used for Simulator.
 
-![Other Linker Flags](https://user-images.githubusercontent.com/6919743/30030628-be2daf6a-91c0-11e7-8b5c-e0ac92d16b80.png)
+Instead, you can use `Archive`. But before we click the button, you need some prepare in the `Build Settings`.
+
+Change the `Skip Install` to `NO`. Or the archived product will not contains any framework.
+
+You can do this by modify the xcconfig file `Module-Shared.xcconfig`. Or you can change it using Xcode GUI.
 
-Alternatively, if this causes compilation problems with frameworks that extend optional libraries, such as Parse,  RestKit or opencv2, instead of the -ObjC flag use:
 ```
--force_load SDWebImage.framework/Versions/Current/SDWebImage
+SKIP_INSTALL = NO
 ```
 
-If you're using Cocoa Pods and have any frameworks that extend optional libraries, such as Parsen RestKit or opencv2, instead of the -ObjC flag use:
+#### Build the Framework or Static Library
+
+Now, you can click the `Archive` button (`Product -> Archive`). After the build success. Xcode will pop-up the Organizer window.
+
+Click `Distribute Content`. Then ensure the `Built Products` is selected. Click `Next` and select a build folder your want to export. Click `Export`.
+
+You can find a `SDWebImage.framework`, or `libSDWebImage.a` and the Headers Files inside the build folder.
+
+![](https://user-images.githubusercontent.com/6919743/55800822-2bd83880-5b07-11e9-8d72-0d57a848aaf4.png)
+
+##### Note for Universal (Fat) Framework
+
+If you need to build Universal Framework (for Simulator and Real Device). You need some command line to combine the framework.
+
+For example, if you already built two frameworks, `iOS/SDWebImage.framework` for iOS Real Device, `Simulator/SDWebImage.framework` for Simulator.
+
 ```
--force_load $(TARGET_BUILD_DIR)/libPods.a
+mkdir Universal/
+cp -R iOS/SDWebImage.framework Universal/SDWebImage.framework
+lipo -create Simulator/SDWebImage.framework/SDWebImage iOS/SDWebImage.framework/SDWebImage -output Universal/SDWebImage.framework/SDWebImage
 ```
-and this:
+
+For Static Library, just do the same thing.
+
 ```
-$(inherited)
+mkdir Universal/
+lipo -create Simulator/libSDWebImage.a iOS/libSDWebImage.a -output Universal/libSDWebImage.a
 ```
+
+#### Link the Framework or Static Library to your project
+
+Under your Project folder. You can create a `Vendor` folder to place the Framework or Static Library.
+
+##### For Framework (Dynamic or Static)
+
+For Framework (Dynamic or Static), the Headers are inside the framework. Just copy the `SDWebImage.framework` into the `Vendor` folder.
+
+If your project is App project and using Dynamic Framework. You need to click `Embedded Binaries`. Select `Add Other...` and select the `SDWebImage.framework`. Xcode automatically add it into the `Linked Frameworks and Libraries` as well.
+
+If not (Framework project or using Static Framework). Click
+click `Linked Frameworks and Libraries`. Select `Add Other...` and select the `SDWebImage.framework`.
+
+Then all things done if you use Framework.
+
+![](https://user-images.githubusercontent.com/6919743/55804348-af495800-5b0e-11e9-828c-70711ea5fdca.png)
+
+##### For Static Library
+
+For Static Library, you need copy both the `libSDWebImage.a` as well as the Headers into the `Vendor` folder.
+
+![](https://user-images.githubusercontent.com/6919743/55804133-4e218480-5b0e-11e9-86ac-f17aabf6e0c5.png)
+
+Open your application Xcode Project, click `Linked Frameworks and Libraries`. Select `Add Other...` and select the `libSDWebImage.a`.
+
+After link, you need to specify the Header Search Path for headers. Check Build Settings's `Header Search Path`, add the Header Search Path, where there must be a `SDWebImage` parent directory of `SDWebImage.h` this umbrella header file.
+
+The example above can using the following path.
+
+```
+$(SRCROOT)/Vendor
+```
+
+Then all things done if you use Static Library.
+
+
+#### Reference
+
+[Technical Note TN2435 - Embedding Frameworks In An App](https://developer.apple.com/library/archive/technotes/tn2435/_index.html)
+
+### Using SDWebImage as Sub Xcode Project
+
+You can also embed SDWebImage as a Sub Xcode Project using in your Xcode Project/Workspace. This can be used for some specify environment which does not support external dependency manager.
+
+#### Clone the repository as submodule
+
+To embed the Sub Xcode Project, you can simply add SDWebImage entire project using Git Submodule. 
+
+```
+cd Vendor/
+git submodule add https://github.com/SDWebImage/SDWebImage.git
+```
+
+Note: If your project don't using Git Submodule, just copy the entire repo of SDWebImage to that Vendor folder, and you can add to your own Version Control tools.
+
+However, using Git Submodule can make it easy to upgrade framework version and reduce Git repo size.
+
+#### Add `SDWebImage.xcodeproj` into your Workspace/Project
+
+Just drag the `SDWebImage.xcodeproj` you cloned, into your Xcode Workspace/Project 's Project Navigator.
+
+For Xcode Workspace, you can put it the same level of your App Project.
+
+For Xcode Project, you can put it inside your App Project.
+
+![](https://user-images.githubusercontent.com/6919743/55799669-802de900-5b04-11e9-84c0-08d4d9452549.png)
+
+#### Link to your App/Framework Target
+
+To use SDWebImage, you should link the `SDWebImage` target.
+
+Go to your App/Framework target's `General` page. Then click `Lined Frameworks and Libraries`, and add the `SDWebImage.framework` or `libSDWebImage.a` (Depends on your use case).
+
+Then all things done.
+
+![](https://user-images.githubusercontent.com/6919743/55799628-68eefb80-5b04-11e9-8f0b-4b7818c5d1fd.png)
+
diff --git a/Docs/SDWebImage-4.0-Migration-guide.md b/Docs/SDWebImage-4.0-Migration-guide.md
index 486eb56c9..715889c9c 100644
--- a/Docs/SDWebImage-4.0-Migration-guide.md
+++ b/Docs/SDWebImage-4.0-Migration-guide.md
@@ -14,7 +14,7 @@ This guide is provided in order to ease the transition of existing applications
 SDWebImage 4.0 officially supports iOS 7 and later, Mac OS X 10.8 and later, watchOS 2 and later and tvOS 9 and later.
 It needs Xcode 7.3 or later to be able to build everything properly.
 
-For targeting previous versions of the SDKs, check [README - Backwards compatibility](https://github.com/rs/SDWebImage#backwards-compatibility)
+For targeting previous versions of the SDKs, check [README - Backwards compatibility](https://github.com/SDWebImage/SDWebImage#backwards-compatibility)
 .
 
 ### Migration
diff --git a/Docs/SDWebImage-5.0-Migration-guide.md b/Docs/SDWebImage-5.0-Migration-guide.md
new file mode 100644
index 000000000..445b75850
--- /dev/null
+++ b/Docs/SDWebImage-5.0-Migration-guide.md
@@ -0,0 +1,284 @@
+## SDWebImage 5.0 Migration Guide
+
+SDWebImage 5.0 is the latest major release of SDWebImage, a top library for downloading and caching images.
+As a major release, following [Semantic Versioning](http://semver.org/) conventions, 5.0 introduces several API-breaking changes with its new architecture.
+
+This guide is provided in order to ease the transition of existing applications using SDWebImage 4.X to the latest APIs, as well as explain the design and structure of new and changed functionality.
+
+### Requirements: iOS 8, Mac OS X 10.10, watchOS 2, tvOS 9, Xcode 9
+
+SDWebImage 5.0 officially supports iOS 8 and later, Mac OS X 10.10 and later, watchOS 2 and later and tvOS 9 and later.
+It needs Xcode 9 or later to be able to build everything properly.
+
+For targeting previous versions of the SDKs, check [README - Backwards compatibility](https://github.com/rs/SDWebImage#backwards-compatibility).
+
+### Migration
+
+Using the view categories brings no change from 4.x to 5.0. 
+
+Objective-C:
+
+```objective-c
+[imageView sd_setImageWithURL:url placeholderImage:placeholderImage];
+```
+
+Swift:
+
+```swift
+imageView.sd_setImage(with: url, placeholderImage: placeholder)
+```
+
+However, all view categories in 5.0 introduce a new extra arg called `SDWebImageContext`. This param can hold anything, as opposed to the previous `SDWebImageOptions` enum limitations. This gives developers advanced control for the behavior of image loading (cache, loader, etc). See the declaration for `SDWebImageContext` for detailed information.
+
+### New Feature
+
+#### Animated Image View
+
+In 5.0, we introduced a brand new mechanism for supporting animated images. This includes animated image loading, rendering, decoding, and also supports customizations (for advanced users).
+
+This animated image solution is available for `iOS`/`tvOS`/`macOS`. The `SDAnimatedImage` is subclass of `UIImage/NSImage`, and `SDAnimatedImageView` is subclass of `UIImageView/NSImageView`, to make them compatible with the common frameworks APIs. See [Animated Image](https://github.com/rs/SDWebImage/wiki/Advanced-Usage#animated-image-50) for more detailed information.
+
+#### Image Transformer
+
+In 5.0, we introduced an easy way to hook an image transformation process after the image was downloaded from network. This allows the user to easily scale, rotate, add rounded corner the original image and even chain a list of transformations. These transformed images will also be stored to the cache as they are after transformation. The reasons for this decision are: avoiding redoing the transformations (which can lead to unwanted behavior) and also time saving. See [Image Transformer](https://github.com/rs/SDWebImage/wiki/Advanced-Usage#image-transformer-50) for more detailed information.
+
+#### Customization
+
+In 5.0, we refactored our framework architecture in many aspects. This makes our framework easier to customize for advanced users, without the need for hooking anything or forking. We introduced [Custom Cache](https://github.com/rs/SDWebImage/wiki/Advanced-Usage#custom-cache-50) to control detailed cache loading behavior, and separate the memory cache & disk cache implementation. We introduced [Custom Loader](https://github.com/rs/SDWebImage/wiki/Advanced-Usage#custom-loader-50) to allow custom loading from your own source (doesn't have to be the network). And also, we changed the current [Custom Coder](https://github.com/rs/SDWebImage/wiki/Advanced-Usage#custom-coder-420) to work better for custom image decoder/encoder and animated images.
+
+#### View Indicator
+In 5.0, we refactored the image loading indicator API into a better and extensible API for `iOS`/`tvOS`/`macOS`. This is suitable for easy usage like providing a loading view during the image loading process. See [View Indicator](https://github.com/rs/SDWebImage/wiki/How-to-use#use-view-indicator-50) for more detailed information.
+
+#### FLAnimatedImage support moved to a dedicated plugin repo
+
+In order to clean up things and make our core project do less things, we decided that the `FLAnimatedImage` integration does not belong here. From 5.0, this will still be available, but under a dedicated repo [SDWebImageFLPlugin](https://github.com/SDWebImage/SDWebImageFLPlugin).
+
+#### Photos Plugin
+
+By taking the advantage of the [Custom Loader](https://github.com/rs/SDWebImage/wiki/Advanced-Usage#custom-loader-50) feature, we introduced a plugin to allow easy loading images from the Photos Library. See [SDWebImagePhotosPlugin](https://github.com/SDWebImage/SDWebImagePhotosPlugin) for more detailed information.
+
+
+### Notable Behavior Changes (without API breaking)
+
+#### Cache
+
+##### Cache Paths
+
+`SDImageCache` in 5.x, use `~/Library/Caches/com.hackemist.SDImageCache/default/` as default cache path. However, 4.x use `~/Library/Caches/default/com.hackemist.SDWebImageCache.default/`. And don't be worried, we will do the migration automatically once the shared cache initialized.
+
+However, if you have some other custom namespace cache instance, you should try to do migration by yourself. But typically, since the cache is designed to be invalid at any time, you'd better not to bind some important logic related on that cache path changes.
+
+And, if you're previously using any version from `5.0.0-beta` to `5.0.0-beta3`, please note that the cache folder has been temporarily moved to `~/Library/Caches/default/com.hackemist.SDImageCache.default/`, however, the final release version of 5.0.0 use the path above. If you upgrade from those beta version, you may need manually do migration, check `+[SDDiskCache moveCacheDirectoryFromPath:toPath:]` for detail information.
+
+##### Cache Cost Function
+
+`SDImageCacheConfig.maxMemoryCost` can be used to specify the memory cost limit. In the 4.x, the cost function is the **pixel count** of images. However, 5.x change it into the total **bytes size** of images. 
+
+Because for memory cache, we actually care about the memory usage about bytes, but not the count of pixels. And pixel count can not accurately represent the memory usage.
+
+The bytes of a image occupied in the memory, can use the simple formula below:
+
+**bytes size** = **pixel count** \* **bytes per pixel**
+
+The **bytes per pixel** is a constant depends on [image pixel format](https://developer.apple.com/library/archive/documentation/GraphicsImaging/Conceptual/drawingwithquartz2d/dq_images/dq_images.html). For mostly used images (8 bits per channel with alpha), the value is 4. So you can simply migrate your previous pixel count value with 4 multiplied.
+
+
+#### Prefetcher
+
+`SDWebImagePrefetcher` in 5.x, change the concept of fetching batch of URLs. Now, each time you call `prefetchURLs:`, you will get a token which represents the specified URLs list. It does not cancel the previous URLs which is prefetching, which make the shared prefetcher behaves more intuitively.
+
+However, in 4.x, each time you call `prefetchURLs:`, it will cancel all previous URLs which is been prefetching.
+
+If you still want the same behavior, manually call `cancelPrefetching` each time before any `prefetchURLs:` calls.
+
+
++ Objective-C
+
+```objective-c
+SDWebImagePrefetcher *prefetcher = SDWebImagePrefetcher.sharedImagePrefetcher;
+[prefetcher cancelPrefetching];
+[prefetcher prefetchURLs:@[url1, url2]];
+```
+
++ Swift
+
+```swift
+let prefetcher = SDWebImagePrefetcher.shared
+prefetcher.cancelPrefetching()
+prefetcher.prefetchURLs([url1, url2])
+```
+
+#### Error codes and domain
+For image loading from network, if you don't pass `SDWebImageRetryFailed` option, we'll try to blocking some URLs which is indeed mark as failed.
+
+This check is done previously in a hard-coded logic for specify error codes. However, due to some compatible issue, we don't check the error domain. (Learn about [NSError's domain and codes](https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/ErrorHandlingCocoa/ErrorObjectsDomains/ErrorObjectsDomains.html)) And arbitrarily block some codes which may from custom download operation implementations.
+
+Since in 5.x, we supports custom loaders which can use any third-party SDKs, and have their own error domain and error codes. So we now only filter the error codes in [NSURLErrorDomain](https://developer.apple.com/documentation/foundation/nsurlerrordomain). If you have already using some error codes without error domain check, or you use [Custom Download Operation](https://github.com/SDWebImage/SDWebImage/wiki/Advanced-Usage#custom-download-operation-40), be sure to update it with the right way.
+
+At the same time, our framework errors, now using the formal `SDWebImageErrorDomain` with the pre-defined codes. Check `SDWebImageError.h` for details.
+
+### API Changes
+
+#### SDImageCache
+
+- moved `maxMemoryCost` and `maxMemoryCountLimit` to `SDImageCacheConfig`
+- `makeDiskCachePath:` removed, use `NSSearchPathForDirectoriesInDomains` with NSString's Path API instead.
+- `addReadOnlyCachePath:` removed, use `additionalCachePathBlock` instead
+- `cachePathForKey:inPath:` removed, use `cachePathForKey:` with NSString's path API instead.
+- `defaultCachePathForKey:` removed, use `cachePathForKey:` instead
+- `SDCacheQueryCompletedBlock` renamed to `SDImageCacheQueryCompletionBlock`
+- `SDWebImageCheckCacheCompletionBlock` renamed to `SDImageCacheCheckCompletionBlock`
+- `SDWebImageCalculateSizeBlock` renamed to `SDImageCacheCalculateSizeBlock`
+- `getSize` renamed to `totalDiskSize`
+- `getDiskCount` renamed to `totalDiskCount`
+
+#### SDImageCacheConfig
+
+- `shouldDecompressImages` removed. Use  `SDImageCacheAvoidDecodeImage` in cache options instead
+- `maxCacheAge` renamed to `maxDiskAge`
+- `maxCacheSize` renamed to `maxDiskSize`
+
+#### SDWebImageManager
+
+- `loadImageWithURL:options:progress:completed:` changed the `completed` param requirement from `nullable` to `nonnull`
+- `loadImageWithURL:options:progress:completed:` return type `id<SDWebImageOperation>` changed to `SDWebImageCombinedOperation *`
+- `imageCache` changed from nullable to nonnull. And property type changed from `SDImageCache *` to `id<SDImageCache>`. The default value does not change.
+- `imageDownloader` renamed to `imageLoader` and changed from nullable to nonnull. And property type changed from `SDWebImageDownloader *` to `id<SDImageLoader>`. The default value does not change.
+- `cacheKeyFilter` property type changed to `id<SDWebImageCacheKeyFilter>`, you can use `+[SDWebImageCacheKeyFilter cacheKeyFilterWithBlock:]` to create
+- `cacheSerializer` property type changed to `id<SDWebImageCacheSerializer>`, you can use `+[SDWebImageCacheSerializer cacheSerializerWithBlock:]` to create
+- `SDWebImageCacheKeyFilterBlock`'s `url` arg change from nullable to nonnull
+- `initWithCache:downloader:` 's `cache` arg type changed from `SDImageCache *` to `id<SDImageCache>`
+- `initWithCache:downloader` renamed to `initWithCache:loader:` 
+- `saveImageToCache:forURL:` removed. Use `SDImageCache storeImage:imageData:forKey:cacheType:completion:` (or `SDImageCache storeImage:forKey:toDisk:completion:` if you use default cache class) with `cacheKeyForURL:` instead.
+- `diskImageExistsForURL:completion:` removed. Use `SDImageCache containsImageForKey:cacheType:completion:` (or `SDImageCache diskImageExistsWithKey:completion:` if you use default cache class) with `cacheKeyForURL:` instead.
+- `cachedImageExistsForURL:completion` removed. Use `SDImageCache containsImageForKey:cacheType:completion:` (or `SDImageCache diskImageExistsWithKey:completion:` and `SDImageCache imageFromMemoryCacheForKey:` if you use default cache class) with `cacheKeyForURL:` instead.
+
+#### SDWebImageManagerDelegate
+
+- removed `imageManager:transformDownloadedImage:forKey:`, use `SDImageTransformer` with context option instead
+
+#### UIView and subclasses (UIImageView, UIButton, ...)
+
+- `sd_internalSetImageWithURL:placeholderImage:options:operationKey:setImageBlock:progress:completed:` renamed to `UIView sd_internalSetImageWithURL:placeholderImage:options:context:setImageBlock:progress:completed:` (The biggest changes is that the completion block type from `SDExternalCompletionBlock` to `SDInternalCompletionBlock`. Which allow advanced user to get more information of image loading process) 
+- `sd_internalSetImageWithURL:placeholderImage:options:operationKey:setImageBlock:progress:completed:context:` removed
+- activity indicator refactoring - use `sd_imageIndicator` with `SDWebImageActivityIndicator`
+  - `sd_setShowActivityIndicatorView:` removed 
+  - `sd_setIndicatorStyle:` removed
+  - `sd_showActivityIndicatorView` removed
+  - `sd_addActivityIndicator:` removed
+  - `sd_removeActivityIndicator:` removed
+
+#### UIImage
+
+- Renamed `isGIF` to `sd_isAnimated`, also `NSImage isGIF` renamed to `NSImage sd_isAnimated`
+- Renamed `decodedImageWithImage:` to `sd_decodedImageWithImage:`
+- Renamed `decodedAndScaledDownImageWithImage:` to `sd_decodedAndScaledDownImageWithImage:`
+- Renamed `sd_animatedGIFWithData` to `sd_imageWithGIFData:`
+- Removed `sd_webpLoopCount`
+
+#### UIImageView
+
+- Removed `sd_setImageWithPreviousCachedImageWithURL:placeholderImage:options:progress:completed`
+
+#### SDWebImageDownloader
+
+- `shouldDecompressImages` moved to `SDWebImageDownloaderConfig.shouldDecompressImages`
+- `maxConcurrentDownloads` moved to `SDWebImageDownloaderConfig.maxConcurrentDownloads`
+- `downloadTimeout` moved to `SDWebImageDownloaderConfig.downloadTimeout`
+- `operationClass` moved to `SDWebImageDownloaderConfig.operationClass`
+- `executionOrder` moved to `SDWebImageDownloaderConfig.executionOrder`
+- `urlCredential` moved to `SDWebImageDownloaderConfig.urlCredential`
+- `username` moved to `SDWebImageDownloaderConfig.username`
+- `password` moved to `SDWebImageDownloaderConfig.password`
+- `initWithSessionConfiguration:` removed, use `initWithConfig:` with session configuration instead
+- `createNewSessionWithConfiguration:` removed, use `initWithConfig:` with new session configuration instead. To modify shared downloader configuration, provide custom `SDWebImageDownloaderConfig.defaultDownloaderConfig` before it created.
+- `headersFilter` removed, use `requestModifier` instead
+- `cancel:` removed, use `-[SDWebImageDownloadToken cancel]` instead
+- `shouldDecompressImages` removed. Use `SDWebImageDownloaderAvoidDecodeImage` in downloader options instead
+- use `SDImageLoaderProgressBlock` instead of `SDWebImageDownloaderProgressBlock`
+- use `SDImageLoaderCompletedBlock` instead of `SDWebImageDownloaderCompletedBlock`
+
+#### SDWebImageDownloaderOperation
+
+- `initWithRequest:inSession:options:context:` is now the designated initializer
+- Removed `shouldUseCredentialStorage` property
+- `SDWebImageDownloadOperationInterface` protocol renamed to `SDWebImageDownloadOperation`
+- `expectedSize` removed, use `response.expectedContentLength` instead
+- `shouldDecompressImages` removed. Use `SDWebImageDownloaderAvoidDecodeImage` in downloader options instead.
+- `response` property change to readonly
+
+#### SDWebImagePrefetcher
+
+- `prefetchURLs:` and `prefetchURLs:progress:completed:` return types changed from `void` to `SDWebImagePrefetchToken`
+- `prefetcherQueue` property renamed to `delegateQueue`
+- `maxConcurrentDownloads` replaced with `maxConcurrentPrefetchCount`
+
+#### SDImageCoder
+- `SDCGColorSpaceGetDeviceRGB()` moved to `+[SDImageCoderHelper colorSpaceGetDeviceRGB]` 
+- `SDCGImageRefContainsAlpha()`, moved to `+[SDImageCoderHelper imageRefContainsAlpha:]`
+- `decodedImageWithData:` replaced with `decodedImageWithData:options:`
+- `encodedDataWithImage:format:` replaced with `encodedDataWithImage:format:options`
+- `init` method from `SDWebImageProgressiveCoder` changed to `initIncrementalWithOptions:`
+- `incrementalDecodedImageWithData:finished` replaced with `updateIncrementalData:finished` and `incrementalDecodedImageWithOptions:` two APIs
+- removed `decompressedImage:data:options`, use `+[SDImageCoderHelper decodedImageWithImage:]` and `+[SDImageCoderHelper decodedAndScaledDownImageWithImage:limitBytes:]` instead
+
+#### Constants
+
+- `SDWebImageInternalSetImageGroupKey` renamed to `SDWebImageContextSetImageGroup`
+- `SDWebImageExternalCustomManagerKey` renamed to `SDWebImageContextCustomManager`
+
+#### Swift Specific API Change
+In SDWebImage 5.0 we did a clean up of the API. We are using many modern Objective-C declarations to generate the Swift API. We now provide full nullability support, string enum, class property, and even custom Swift API name, all to make the framework easier to use for our Swift users. Here are the API change specify for Swift. 
+
+##### UIView+WebCache
+- `sd_imageURL()` changed to `sd_imageURL`
+
+##### SDImageCache
+- `shared()` changed to `shared`
+
+##### SDWebImageManager
+- `shared()` changed to `shared`
+- `isRunning()` changed to `isRunning`
+
+##### SDWebImageDownloader
+- `shared()` changed to `shared`
+- `setOperationClass(_:)` available for Swift user with `operationClass` property
+- `setSuspended(_:)` changed to `isSuspended` property
+
+##### SDWebImageDownloadOperation
+- `SDWebImageDownloadOperationInterface` protocol renamed to `SDWebImageDownloadOperationProtocol`. 
+
+##### SDImageCodersManager
+
+- `sharedInstance()` changed to `shared`
+
+##### SDImageIOCoder
+
+- `shared()` changed to `shared`
+
+##### SDImageGIFCoder
+
+- `shared()` changed to `shared`
+
+##### SDImageWebPCoder
+
+- `shared()` changed to `shared`
+
+##### NSData-ImageContentType
+
+- `sd_UTTypeFromSDImageFormat` return `CFString` instead of `Unmanaged<CFString>`
+
+##### UIButton-WebCache
+
+- `sd_currentImageURL()` changed to `sd_currentImageURL`
+  
+##### NSButton-WebCache
+
+- `sd_currentImageURL()` changed to `sd_currentImageURL`
+- `sd_currentAlternateImageURL()` changed to `sd_currentAlternateImageURL`
+
+### Full API Diff
+For advanced user who need the detailed API diff, we provide the full diff in a HTML web page (Currently based on 4.4.4 and 5.0.0-beta4):
+
+[SDWebImage 5.0 API Diff](https://htmlpreview.github.io/?https://github.com/rs/SDWebImage/blob/master/Docs/API-Diff/5.0/apidiff.html).
+
diff --git a/Docs/SDWebImage.mdj b/Docs/SDWebImage.mdj
deleted file mode 100644
index 9f5f7db35..000000000
--- a/Docs/SDWebImage.mdj
+++ /dev/null
@@ -1,22762 +0,0 @@
-{
-	"_type": "Project",
-	"_id": "AAAAAAFF+h6SjaM2Hec=",
-	"name": "SDWebImage",
-	"ownedElements": [
-		{
-			"_type": "UMLModel",
-			"_id": "AAAAAAFF+qBWK6M3Z8Y=",
-			"_parent": {
-				"$ref": "AAAAAAFF+h6SjaM2Hec="
-			},
-			"name": "SDWebImage Model",
-			"ownedElements": [
-				{
-					"_type": "UMLClassDiagram",
-					"_id": "AAAAAAFF+qBtyKM79qY=",
-					"_parent": {
-						"$ref": "AAAAAAFF+qBWK6M3Z8Y="
-					},
-					"name": "Class Diagram",
-					"visible": true,
-					"defaultDiagram": true,
-					"ownedViews": [
-						{
-							"_type": "UMLInterfaceView",
-							"_id": "AAAAAAFUmMqaTslne2E=",
-							"_parent": {
-								"$ref": "AAAAAAFF+qBtyKM79qY="
-							},
-							"model": {
-								"$ref": "AAAAAAFUkhg5/4zs5zU="
-							},
-							"subViews": [
-								{
-									"_type": "UMLNameCompartmentView",
-									"_id": "AAAAAAFUmMqaT8lo2ag=",
-									"_parent": {
-										"$ref": "AAAAAAFUmMqaTslne2E="
-									},
-									"model": {
-										"$ref": "AAAAAAFUkhg5/4zs5zU="
-									},
-									"subViews": [
-										{
-											"_type": "LabelView",
-											"_id": "AAAAAAFUmMqaT8lpMw4=",
-											"_parent": {
-												"$ref": "AAAAAAFUmMqaT8lo2ag="
-											},
-											"visible": true,
-											"enabled": true,
-											"lineColor": "#000000",
-											"fillColor": "#ffffff",
-											"fontColor": "#000000",
-											"font": "Arial;13;0",
-											"showShadow": true,
-											"containerChangeable": false,
-											"containerExtending": false,
-											"left": 957,
-											"top": 37,
-											"width": 224.10009765625,
-											"height": 13,
-											"autoResize": false,
-											"underline": false,
-											"text": "«interface»",
-											"horizontalAlignment": 2,
-											"verticalAlignment": 5,
-											"wordWrap": false
-										},
-										{
-											"_type": "LabelView",
-											"_id": "AAAAAAFUmMqaT8lqdv4=",
-											"_parent": {
-												"$ref": "AAAAAAFUmMqaT8lo2ag="
-											},
-											"visible": true,
-											"enabled": true,
-											"lineColor": "#000000",
-											"fillColor": "#ffffff",
-											"fontColor": "#000000",
-											"font": "Arial;13;1",
-											"showShadow": true,
-											"containerChangeable": false,
-											"containerExtending": false,
-											"left": 957,
-											"top": 52,
-											"width": 224.10009765625,
-											"height": 13,
-											"autoResize": false,
-											"underline": false,
-											"text": "SDWebImagePrefetcherDelegate",
-											"horizontalAlignment": 2,
-											"verticalAlignment": 5,
-											"wordWrap": false
-										},
-										{
-											"_type": "LabelView",
-											"_id": "AAAAAAFUmMqaT8lrlno=",
-											"_parent": {
-												"$ref": "AAAAAAFUmMqaT8lo2ag="
-											},
-											"visible": true,
-											"enabled": true,
-											"lineColor": "#000000",
-											"fillColor": "#ffffff",
-											"fontColor": "#000000",
-											"font": "Arial;13;0",
-											"showShadow": true,
-											"containerChangeable": false,
-											"containerExtending": false,
-											"left": 957,
-											"top": 67,
-											"width": 224.10009765625,
-											"height": 13,
-											"autoResize": false,
-											"underline": false,
-											"text": "(from SDWebImage)",
-											"horizontalAlignment": 2,
-											"verticalAlignment": 5,
-											"wordWrap": false
-										},
-										{
-											"_type": "LabelView",
-											"_id": "AAAAAAFUmMqaT8ls+2c=",
-											"_parent": {
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-											},
-											"visible": false,
-											"enabled": true,
-											"lineColor": "#000000",
-											"fillColor": "#ffffff",
-											"fontColor": "#000000",
-											"font": "Arial;13;0",
-											"showShadow": true,
-											"containerChangeable": false,
-											"containerExtending": false,
-											"left": 266,
-											"top": -646,
-											"width": 0,
-											"height": 13,
-											"autoResize": false,
-											"underline": false,
-											"horizontalAlignment": 1,
-											"verticalAlignment": 5,
-											"wordWrap": false
-										}
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-									"visible": true,
-									"enabled": true,
-									"lineColor": "#000000",
-									"fillColor": "#ffffff",
-									"fontColor": "#000000",
-									"font": "Arial;13;0",
-									"showShadow": true,
-									"containerChangeable": false,
-									"containerExtending": false,
-									"left": 952,
-									"top": 32,
-									"width": 234.10009765625,
-									"height": 53,
-									"autoResize": false,
-									"stereotypeLabel": {
-										"$ref": "AAAAAAFUmMqaT8lpMw4="
-									},
-									"nameLabel": {
-										"$ref": "AAAAAAFUmMqaT8lqdv4="
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-									"namespaceLabel": {
-										"$ref": "AAAAAAFUmMqaT8lrlno="
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-									"propertyLabel": {
-										"$ref": "AAAAAAFUmMqaT8ls+2c="
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-								{
-									"_type": "UMLAttributeCompartmentView",
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-									"_parent": {
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-									"visible": false,
-									"enabled": true,
-									"lineColor": "#000000",
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-									"fontColor": "#000000",
-									"font": "Arial;13;0",
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-									"containerChangeable": false,
-									"containerExtending": false,
-									"left": 952,
-									"top": 85,
-									"width": 243,
-									"height": 10,
-									"autoResize": false
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-								{
-									"_type": "UMLOperationCompartmentView",
-									"_id": "AAAAAAFUmMqaUMluvjM=",
-									"_parent": {
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-									"subViews": [
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-											"_parent": {
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-											"model": {
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-											"visible": true,
-											"enabled": true,
-											"lineColor": "#000000",
-											"fillColor": "#ffffff",
-											"fontColor": "#000000",
-											"font": "Arial;13;0",
-											"showShadow": true,
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-											"left": 957,
-											"top": 90,
-											"width": 248.10009765625,
-											"height": 13,
-											"autoResize": false,
-											"underline": false,
-											"text": "+didPrefetchURL:()",
-											"horizontalAlignment": 0,
-											"verticalAlignment": 5,
-											"wordWrap": false
-										},
-										{
-											"_type": "UMLOperationView",
-											"_id": "AAAAAAFUmMqaWMmQbyY=",
-											"_parent": {
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-											"visible": true,
-											"enabled": true,
-											"lineColor": "#000000",
-											"fillColor": "#ffffff",
-											"fontColor": "#000000",
-											"font": "Arial;13;0",
-											"showShadow": true,
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-											"width": 248.10009765625,
-											"height": 13,
-											"autoResize": false,
-											"underline": false,
-											"text": "+didFinishWithTotalCount:()",
-											"horizontalAlignment": 0,
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-										}
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-									"visible": true,
-									"enabled": true,
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-									"lineColor": "#000000",
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-									"left": 133,
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-									"width": 10,
-									"height": 10,
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-							"suppressOperations": false,
-							"suppressReceptions": true,
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-							"attributeCompartment": {
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-							"operationCompartment": {
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-							"receptionCompartment": {
-								"$ref": "AAAAAAFUmMqaUMlvfNw="
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-											"width": 288.13916015625,
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-											"wordWrap": false
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-											"_parent": {
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-											"lineColor": "#000000",
-											"fillColor": "#ffffff",
-											"fontColor": "#000000",
-											"font": "Arial;13;0",
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-											"text": "(from SDWebImage)",
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-											"verticalAlignment": 5,
-											"wordWrap": false
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-											"fillColor": "#ffffff",
-											"fontColor": "#000000",
-											"font": "Arial;13;0",
-											"showShadow": true,
-											"containerChangeable": false,
-											"containerExtending": false,
-											"left": 248,
-											"top": -188,
-											"width": 0,
-											"height": 13,
-											"autoResize": false,
-											"underline": false,
-											"horizontalAlignment": 1,
-											"verticalAlignment": 5,
-											"wordWrap": false
-										}
-									],
-									"visible": true,
-									"enabled": true,
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+      0.2681068,
+      0.26850593,
+      1
+    ],
+    "objectMetadataList" : [
+      [
+        "26DBAE76-5DD8-47B6-A085-1B4ADA111097",
+        "Root"
+      ],
+      {
+        "isExpanded" : true,
+        "isLocked" : false
+      }
+    ]
+  },
+  "34C460AE-CA1B-4348-BD05-621ACBDFFE97" : {
+    "cameraTransform" : [
+      0.99999994,
+      0,
+      -0,
+      0,
+      -0,
+      0.8660255,
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+      0,
+      0.49999988,
+      0.8660255,
+      0,
+      0,
+      0.27093542,
+      0.46927398,
+      1
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+    "objectMetadataList" : [
+
+    ]
+  },
+  "440DE5B4-E4E4-459B-AABF-9ACE96319272" : {
+    "cameraTransform" : [
+      0.99999994,
+      0,
+      -0,
+      0,
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+      1.0361054,
+      1
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+    "objectMetadataList" : [
+      [
+        "440DE5B4-E4E4-459B-AABF-9ACE96319272",
+        "Root"
+      ],
+      {
+        "isExpanded" : true,
+        "isLocked" : false
+      }
+    ]
+  },
+  "FBD8436F-6B8B-4B82-99B5-995D538B4704" : {
+    "cameraTransform" : [
+      0.99999994,
+      0,
+      -0,
+      0,
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+      0,
+      0.49999994,
+      0.8660254,
+      0,
+      0,
+      0.5981957,
+      1.0361054,
+      1
+    ],
+    "objectMetadataList" : [
+      [
+        "FBD8436F-6B8B-4B82-99B5-995D538B4704",
+        "Root"
+      ],
+      {
+        "isExpanded" : true,
+        "isLocked" : false
+      }
+    ]
+  }
+}
\ No newline at end of file
diff --git a/Examples/Packages/RealityKitContent/Package.realitycomposerpro/WorkspaceData/Settings.rcprojectdata b/Examples/Packages/RealityKitContent/Package.realitycomposerpro/WorkspaceData/Settings.rcprojectdata
new file mode 100644
index 000000000..6dea95c8d
--- /dev/null
+++ b/Examples/Packages/RealityKitContent/Package.realitycomposerpro/WorkspaceData/Settings.rcprojectdata
@@ -0,0 +1,17 @@
+{
+  "cameraPresets" : {
+
+  },
+  "secondaryToolbarData" : {
+    "isGridVisible" : true,
+    "sceneReverbPreset" : -1
+  },
+  "unitDefaults" : {
+    "°" : "°",
+    "kg" : "g",
+    "m" : "cm",
+    "m\/s" : "m\/s",
+    "m\/s²" : "m\/s²",
+    "s" : "s"
+  }
+}
\ No newline at end of file
diff --git a/Examples/Packages/RealityKitContent/Package.swift b/Examples/Packages/RealityKitContent/Package.swift
new file mode 100644
index 000000000..d043ae1ad
--- /dev/null
+++ b/Examples/Packages/RealityKitContent/Package.swift
@@ -0,0 +1,25 @@
+// swift-tools-version:5.9
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "RealityKitContent",
+    products: [
+        // Products define the executables and libraries a package produces, and make them visible to other packages.
+        .library(
+            name: "RealityKitContent",
+            targets: ["RealityKitContent"]),
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        .target(
+            name: "RealityKitContent",
+            dependencies: []),
+    ]
+)
\ No newline at end of file
diff --git a/Examples/Packages/RealityKitContent/README.md b/Examples/Packages/RealityKitContent/README.md
new file mode 100644
index 000000000..486b5755e
--- /dev/null
+++ b/Examples/Packages/RealityKitContent/README.md
@@ -0,0 +1,3 @@
+# RealityKitContent
+
+A description of this package.
\ No newline at end of file
diff --git a/Examples/Packages/RealityKitContent/Sources/RealityKitContent/RealityKitContent.rkassets/Materials/GridMaterial.usda b/Examples/Packages/RealityKitContent/Sources/RealityKitContent/RealityKitContent.rkassets/Materials/GridMaterial.usda
new file mode 100644
index 000000000..b7afd0240
--- /dev/null
+++ b/Examples/Packages/RealityKitContent/Sources/RealityKitContent/RealityKitContent.rkassets/Materials/GridMaterial.usda
@@ -0,0 +1,216 @@
+#usda 1.0
+(
+    defaultPrim = "Root"
+    metersPerUnit = 1
+    upAxis = "Y"
+)
+
+def Xform "Root"
+{
+    def Material "GridMaterial"
+    {
+        reorder nameChildren = ["", "", "", "", "", "", "", "", "", "", "", "", "", "", "DefaultSurfaceShader", "MaterialXPreviewSurface", "Texcoord", "Add", "Multiply", "Fractional", "LineCounts", "Multiply_1", "Separate2", "Separate2_1", "Ifgreater", "Ifgreater_1", "Max", "Background_Color"]
+        token outputs:mtlx:surface.connect = </Root/GridMaterial/MaterialXPreviewSurface.outputs:out>
+        token outputs:realitykit:vertex
+        token outputs:surface
+        float2 ui:nodegraph:realitykit:subgraphOutputs:pos = (2222, 300.5)
+        float2 ui:nodegraph:realitykit:subgraphOutputs:size = (182, 89)
+        int ui:nodegraph:realitykit:subgraphOutputs:stackingOrder = 749
+
+        def Shader "DefaultSurfaceShader"
+        {
+            uniform token info:id = "UsdPreviewSurface"
+            color3f inputs:diffuseColor = (1, 1, 1)
+            float inputs:roughness = 0.75
+            token outputs:surface
+        }
+
+        def Shader "MaterialXPreviewSurface"
+        {
+            uniform token info:id = "ND_UsdPreviewSurface_surfaceshader"
+            float inputs:clearcoat
+            float inputs:clearcoatRoughness
+            color3f inputs:diffuseColor.connect = </Root/GridMaterial/Remap.outputs:out>
+            color3f inputs:emissiveColor
+            float inputs:ior
+            float inputs:metallic = 0.15
+            float3 inputs:normal
+            float inputs:occlusion
+            float inputs:opacity
+            float inputs:opacityThreshold
+            float inputs:roughness = 0.5
+            token outputs:out
+            float2 ui:nodegraph:node:pos = (1967, 300.5)
+            float2 ui:nodegraph:node:size = (208, 297)
+            int ui:nodegraph:node:stackingOrder = 870
+            string[] ui:nodegraph:realitykit:node:attributesShowingChildren = ["Advanced"]
+        }
+
+        def Shader "Texcoord"
+        {
+            uniform token info:id = "ND_texcoord_vector2"
+            float2 outputs:out
+            float2 ui:nodegraph:node:pos = (94.14453, 35.29297)
+            float2 ui:nodegraph:node:size = (182, 43)
+            int ui:nodegraph:node:stackingOrder = 1358
+        }
+
+        def Shader "Multiply"
+        {
+            uniform token info:id = "ND_multiply_vector2"
+            float2 inputs:in1.connect = </Root/GridMaterial/Texcoord.outputs:out>
+            float2 inputs:in2 = (32, 15)
+            float2 inputs:in2.connect = </Root/GridMaterial/LineCounts.outputs:out>
+            float2 outputs:out
+            float2 ui:nodegraph:node:pos = (275.64453, 47.29297)
+            float2 ui:nodegraph:node:size = (61, 36)
+            int ui:nodegraph:node:stackingOrder = 1348
+            string[] ui:nodegraph:realitykit:node:attributesShowingChildren = ["inputs:in2"]
+        }
+
+        def Shader "Fractional"
+        {
+            uniform token info:id = "ND_realitykit_fractional_vector2"
+            float2 inputs:in.connect = </Root/GridMaterial/Multiply.outputs:out>
+            float2 outputs:out
+            float2 ui:nodegraph:node:pos = (440.5, 49.5)
+            float2 ui:nodegraph:node:size = (155, 99)
+            int ui:nodegraph:node:stackingOrder = 1345
+        }
+
+        def Shader "BaseColor"
+        {
+            uniform token info:id = "ND_constant_color3"
+            color3f inputs:value = (0.89737034, 0.89737034, 0.89737034) (
+                colorSpace = "Input - Texture - sRGB - sRGB"
+            )
+            color3f inputs:value.connect = None
+            color3f outputs:out
+            float2 ui:nodegraph:node:pos = (1537.5977, 363.07812)
+            float2 ui:nodegraph:node:size = (150, 43)
+            int ui:nodegraph:node:stackingOrder = 1353
+        }
+
+        def Shader "LineColor"
+        {
+            uniform token info:id = "ND_constant_color3"
+            color3f inputs:value = (0.55945957, 0.55945957, 0.55945957) (
+                colorSpace = "Input - Texture - sRGB - sRGB"
+            )
+            color3f inputs:value.connect = None
+            color3f outputs:out
+            float2 ui:nodegraph:node:pos = (1536.9844, 287.86328)
+            float2 ui:nodegraph:node:size = (146, 43)
+            int ui:nodegraph:node:stackingOrder = 1355
+        }
+
+        def Shader "LineWidths"
+        {
+            uniform token info:id = "ND_combine2_vector2"
+            float inputs:in1 = 0.1
+            float inputs:in2 = 0.1
+            float2 outputs:out
+            float2 ui:nodegraph:node:pos = (443.64453, 233.79297)
+            float2 ui:nodegraph:node:size = (151, 43)
+            int ui:nodegraph:node:stackingOrder = 1361
+        }
+
+        def Shader "LineCounts"
+        {
+            uniform token info:id = "ND_combine2_vector2"
+            float inputs:in1 = 24
+            float inputs:in2 = 12
+            float2 outputs:out
+            float2 ui:nodegraph:node:pos = (94.14453, 138.29297)
+            float2 ui:nodegraph:node:size = (153, 43)
+            int ui:nodegraph:node:stackingOrder = 1359
+        }
+
+        def Shader "Remap"
+        {
+            uniform token info:id = "ND_remap_color3"
+            color3f inputs:in.connect = </Root/GridMaterial/Combine3.outputs:out>
+            color3f inputs:inhigh.connect = None
+            color3f inputs:inlow.connect = None
+            color3f inputs:outhigh.connect = </Root/GridMaterial/BaseColor.outputs:out>
+            color3f inputs:outlow.connect = </Root/GridMaterial/LineColor.outputs:out>
+            color3f outputs:out
+            float2 ui:nodegraph:node:pos = (1755.5, 300.5)
+            float2 ui:nodegraph:node:size = (95, 171)
+            int ui:nodegraph:node:stackingOrder = 1282
+            string[] ui:nodegraph:realitykit:node:attributesShowingChildren = ["inputs:outlow"]
+        }
+
+        def Shader "Separate2"
+        {
+            uniform token info:id = "ND_separate2_vector2"
+            float2 inputs:in.connect = </Root/GridMaterial/Range.outputs:out>
+            float outputs:outx
+            float outputs:outy
+            float2 ui:nodegraph:node:pos = (1212.6445, 128.91797)
+            float2 ui:nodegraph:node:size = (116, 117)
+            int ui:nodegraph:node:stackingOrder = 1363
+        }
+
+        def Shader "Combine3"
+        {
+            uniform token info:id = "ND_combine3_color3"
+            float inputs:in1.connect = </Root/GridMaterial/Min.outputs:out>
+            float inputs:in2.connect = </Root/GridMaterial/Min.outputs:out>
+            float inputs:in3.connect = </Root/GridMaterial/Min.outputs:out>
+            color3f outputs:out
+            float2 ui:nodegraph:node:pos = (1578.1445, 128.91797)
+            float2 ui:nodegraph:node:size = (146, 54)
+            int ui:nodegraph:node:stackingOrder = 1348
+        }
+
+        def Shader "Range"
+        {
+            uniform token info:id = "ND_range_vector2"
+            bool inputs:doclamp = 1
+            float2 inputs:gamma = (2, 2)
+            float2 inputs:in.connect = </Root/GridMaterial/Absval.outputs:out>
+            float2 inputs:inhigh.connect = </Root/GridMaterial/LineWidths.outputs:out>
+            float2 inputs:inlow = (0.02, 0.02)
+            float2 inputs:outhigh
+            float2 inputs:outlow
+            float2 outputs:out
+            float2 ui:nodegraph:node:pos = (990.64453, 128.91797)
+            float2 ui:nodegraph:node:size = (98, 207)
+            int ui:nodegraph:node:stackingOrder = 1364
+        }
+
+        def Shader "Subtract"
+        {
+            uniform token info:id = "ND_subtract_vector2"
+            float2 inputs:in1.connect = </Root/GridMaterial/Fractional.outputs:out>
+            float2 inputs:in2.connect = </Root/GridMaterial/LineWidths.outputs:out>
+            float2 outputs:out
+            float2 ui:nodegraph:node:pos = (612.64453, 87.04297)
+            float2 ui:nodegraph:node:size = (63, 36)
+            int ui:nodegraph:node:stackingOrder = 1348
+        }
+
+        def Shader "Absval"
+        {
+            uniform token info:id = "ND_absval_vector2"
+            float2 inputs:in.connect = </Root/GridMaterial/Subtract.outputs:out>
+            float2 outputs:out
+            float2 ui:nodegraph:node:pos = (765.64453, 87.04297)
+            float2 ui:nodegraph:node:size = (123, 43)
+            int ui:nodegraph:node:stackingOrder = 1348
+        }
+
+        def Shader "Min"
+        {
+            uniform token info:id = "ND_min_float"
+            float inputs:in1.connect = </Root/GridMaterial/Separate2.outputs:outx>
+            float inputs:in2.connect = </Root/GridMaterial/Separate2.outputs:outy>
+            float outputs:out
+            float2 ui:nodegraph:node:pos = (1388.1445, 128.91797)
+            float2 ui:nodegraph:node:size = (114, 36)
+            int ui:nodegraph:node:stackingOrder = 1363
+        }
+    }
+}
+
diff --git a/Examples/Packages/RealityKitContent/Sources/RealityKitContent/RealityKitContent.rkassets/Scene.usda b/Examples/Packages/RealityKitContent/Sources/RealityKitContent/RealityKitContent.rkassets/Scene.usda
new file mode 100644
index 000000000..4cb070bf4
--- /dev/null
+++ b/Examples/Packages/RealityKitContent/Sources/RealityKitContent/RealityKitContent.rkassets/Scene.usda
@@ -0,0 +1,59 @@
+#usda 1.0
+(
+    defaultPrim = "Root"
+    metersPerUnit = 1
+    upAxis = "Y"
+)
+
+def Xform "Root"
+{
+    reorder nameChildren = ["GridMaterial", "Sphere"]
+    rel material:binding = None (
+        bindMaterialAs = "weakerThanDescendants"
+    )
+
+    def Sphere "Sphere" (
+        active = true
+        prepend apiSchemas = ["MaterialBindingAPI"]
+    )
+    {
+        rel material:binding = </Root/GridMaterial/GridMaterial> (
+            bindMaterialAs = "weakerThanDescendants"
+        )
+        double radius = 0.05
+        quatf xformOp:orient = (1, 0, 0, 0)
+        float3 xformOp:scale = (1, 1, 1)
+        float3 xformOp:translate = (0, 0, 0.0004)
+        uniform token[] xformOpOrder = ["xformOp:translate", "xformOp:orient", "xformOp:scale"]
+
+        def RealityKitComponent "Collider"
+        {
+            uint group = 1
+            uniform token info:id = "RealityKit.Collider"
+            uint mask = 4294967295
+            token type = "Default"
+
+            def RealityKitStruct "Shape"
+            {
+                float3 extent = (0.2, 0.2, 0.2)
+                float radius = 0.05
+                token shapeType = "Sphere"
+            }
+        }
+
+        def RealityKitComponent "InputTarget"
+        {
+            uniform token info:id = "RealityKit.InputTarget"
+        }
+    }
+
+    def "GridMaterial" (
+        active = true
+        prepend references = @Materials/GridMaterial.usda@
+    )
+    {
+        float3 xformOp:scale = (1, 1, 1)
+        uniform token[] xformOpOrder = ["xformOp:translate", "xformOp:orient", "xformOp:scale"]
+    }
+}
+
diff --git a/Examples/Packages/RealityKitContent/Sources/RealityKitContent/RealityKitContent.swift b/Examples/Packages/RealityKitContent/Sources/RealityKitContent/RealityKitContent.swift
new file mode 100644
index 000000000..5caba4e3d
--- /dev/null
+++ b/Examples/Packages/RealityKitContent/Sources/RealityKitContent/RealityKitContent.swift
@@ -0,0 +1,4 @@
+import Foundation
+
+/// Bundle for the RealityKitContent project
+public let realityKitContentBundle = Bundle.module
diff --git a/Examples/SDWebImage Demo.xcodeproj/project.pbxproj b/Examples/SDWebImage Demo.xcodeproj/project.pbxproj
index 3b676116c..2876057ba 100644
--- a/Examples/SDWebImage Demo.xcodeproj/project.pbxproj	
+++ b/Examples/SDWebImage Demo.xcodeproj/project.pbxproj	
@@ -3,26 +3,27 @@
 	archiveVersion = 1;
 	classes = {
 	};
-	objectVersion = 46;
+	objectVersion = 54;
 	objects = {
 
 /* Begin PBXBuildFile section */
-		327E2DCD1FAF0D6A00EF52C2 /* SDWebImage.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 43A0FAAF1BDD16AC00B7582B /* SDWebImage.framework */; };
-		327E2DCE1FAF0D6A00EF52C2 /* SDWebImage.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 43A0FAAF1BDD16AC00B7582B /* SDWebImage.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
-		327E2DD21FAF0D7000EF52C2 /* SDWebImage.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 43A629E71D0DFD000089D7DD /* SDWebImage.framework */; };
-		327E2DD31FAF0D7000EF52C2 /* SDWebImage.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 43A629E71D0DFD000089D7DD /* SDWebImage.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
-		327E2DD71FAF0D7900EF52C2 /* SDWebImage.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 4397D2751D0DDBE100BB2784 /* SDWebImage.framework */; };
-		327E2DD81FAF0D7900EF52C2 /* SDWebImage.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 4397D2751D0DDBE100BB2784 /* SDWebImage.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
-		327E2DDC1FAF0D8000EF52C2 /* SDWebImage.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 431739601CDFCC370008FEB9 /* SDWebImage.framework */; };
-		327E2DDD1FAF0D8000EF52C2 /* SDWebImage.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 431739601CDFCC370008FEB9 /* SDWebImage.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
+		022828CA975463BEC08FDA2D /* Pods_SDWebImage_iOS_Demo.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 7527DE20028C49345CF3C72F /* Pods_SDWebImage_iOS_Demo.framework */; };
+		3220E2732B7B0755005F83A5 /* RealityKitContent in Frameworks */ = {isa = PBXBuildFile; productRef = 3220E2722B7B0755005F83A5 /* RealityKitContent */; };
+		3220E2752B7B0755005F83A5 /* App.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3220E2742B7B0755005F83A5 /* App.swift */; };
+		3220E2772B7B0755005F83A5 /* ContentView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3220E2762B7B0755005F83A5 /* ContentView.swift */; };
+		3220E2792B7B0755005F83A5 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 3220E2782B7B0755005F83A5 /* Assets.xcassets */; };
+		3220E27C2B7B0755005F83A5 /* Preview Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 3220E27B2B7B0755005F83A5 /* Preview Assets.xcassets */; };
+		32464A842B7B0C30006BE70E /* DetailView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 32464A832B7B0C30006BE70E /* DetailView.swift */; };
 		32892E311FAE898C00BE8320 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 32892E301FAE898C00BE8320 /* Assets.xcassets */; };
 		32892E351FAE89FE00BE8320 /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 32892E341FAE89FD00BE8320 /* LaunchScreen.storyboard */; };
+		328CA3AB29980A840063950F /* WindowController.m in Sources */ = {isa = PBXBuildFile; fileRef = 328CA3AA29980A840063950F /* WindowController.m */; };
 		3E75A9861742DBE700DA412D /* CustomPathImages in Resources */ = {isa = PBXBuildFile; fileRef = 3E75A9851742DBE700DA412D /* CustomPathImages */; };
 		4314D1AA1D0E1181004B36C9 /* main.m in Sources */ = {isa = PBXBuildFile; fileRef = 4314D1A91D0E1181004B36C9 /* main.m */; };
 		4314D1AD1D0E1181004B36C9 /* AppDelegate.m in Sources */ = {isa = PBXBuildFile; fileRef = 4314D1AC1D0E1181004B36C9 /* AppDelegate.m */; };
 		4314D1B01D0E1182004B36C9 /* ViewController.m in Sources */ = {isa = PBXBuildFile; fileRef = 4314D1AF1D0E1182004B36C9 /* ViewController.m */; };
 		4314D1B31D0E1182004B36C9 /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 4314D1B11D0E1182004B36C9 /* Main.storyboard */; };
 		4314D1B51D0E1182004B36C9 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 4314D1B41D0E1182004B36C9 /* Assets.xcassets */; };
+		434BF852C834EED767AACFB0 /* Pods_SDWebImage_Vision_Demo.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 29A9D56D23804E7B2212CFA6 /* Pods_SDWebImage_Vision_Demo.framework */; };
 		43A629D31D0DFD000089D7DD /* AppDelegate.m in Sources */ = {isa = PBXBuildFile; fileRef = 43A629D21D0DFD000089D7DD /* AppDelegate.m */; };
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@@ -35,7 +36,7 @@
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 /* Begin PBXGroup section */
+		3220E26F2B7B0755005F83A5 /* SDWebImage Vision Demo */ = {
+			isa = PBXGroup;
+			children = (
+				3220E2742B7B0755005F83A5 /* App.swift */,
+				3220E2762B7B0755005F83A5 /* ContentView.swift */,
+				32464A832B7B0C30006BE70E /* DetailView.swift */,
+				3220E2782B7B0755005F83A5 /* Assets.xcassets */,
+				3220E27D2B7B0755005F83A5 /* Info.plist */,
+				3220E27A2B7B0755005F83A5 /* Preview Content */,
+			);
+			path = "SDWebImage Vision Demo";
+			sourceTree = "<group>";
+		};
+		3220E2702B7B0755005F83A5 /* Packages */ = {
+			isa = PBXGroup;
+			children = (
+				3220E2712B7B0755005F83A5 /* RealityKitContent */,
+			);
+			path = Packages;
+			sourceTree = "<group>";
+		};
+		3220E27A2B7B0755005F83A5 /* Preview Content */ = {
+			isa = PBXGroup;
+			children = (
+				3220E27B2B7B0755005F83A5 /* Preview Assets.xcassets */,
+			);
+			path = "Preview Content";
+			sourceTree = "<group>";
+		};
 		4314D1A71D0E1181004B36C9 /* SDWebImage TV Demo */ = {
 			isa = PBXGroup;
 			children = (
@@ -358,6 +334,8 @@
 			children = (
 				43A629D11D0DFD000089D7DD /* AppDelegate.h */,
 				43A629D21D0DFD000089D7DD /* AppDelegate.m */,
+				328CA3A929980A840063950F /* WindowController.h */,
+				328CA3AA29980A840063950F /* WindowController.m */,
 				43A629D71D0DFD000089D7DD /* ViewController.h */,
 				43A629D81D0DFD000089D7DD /* ViewController.m */,
 				43A629DA1D0DFD000089D7DD /* Assets.xcassets */,
@@ -413,14 +391,17 @@
 		5376128A155AB74D005750A4 = {
 			isa = PBXGroup;
 			children = (
-				DA248D6C1954841D00390AB0 /* SDWebImage.xcodeproj */,
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 				5376129F155AB74D005750A4 /* SDWebImage Demo */,
 				43A629D01D0DFD000089D7DD /* SDWebImage OSX Demo */,
 				43A629EF1D0E07600089D7DD /* SDWebImage Watch Demo */,
 				43A629FE1D0E07600089D7DD /* SDWebImage Watch Demo Extension */,
 				4314D1A71D0E1181004B36C9 /* SDWebImage TV Demo */,
+				3220E26F2B7B0755005F83A5 /* SDWebImage Vision Demo */,
 				53761298155AB74D005750A4 /* Frameworks */,
+				3220E2702B7B0755005F83A5 /* Packages */,
 				53761296155AB74D005750A4 /* Products */,
+				75D6E1708C75E4AC2FA214EC /* Pods */,
 			);
 			sourceTree = "<group>";
 		};
@@ -432,6 +413,7 @@
 				43A629EE1D0E07600089D7DD /* SDWebImage Watch Demo.app */,
 				43A629FA1D0E07600089D7DD /* SDWebImage Watch Demo Extension.appex */,
 				4314D1A61D0E1181004B36C9 /* SDWebImage TV Demo.app */,
+				3220E26E2B7B0755005F83A5 /* SDWebImage Vision Demo.app */,
 			);
 			name = Products;
 			sourceTree = "<group>";
@@ -444,6 +426,11 @@
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 				5376129B155AB74D005750A4 /* Foundation.framework */,
 				5376129D155AB74D005750A4 /* CoreGraphics.framework */,
+				18242F3D24D6BE93D067E4E8 /* Pods_SDWebImage_OSX_Demo.framework */,
+				56FF116D6E7696F07957CE40 /* Pods_SDWebImage_TV_Demo.framework */,
+				8D99CEC262035CE49117E77D /* Pods_SDWebImage_Watch_Demo_Extension.framework */,
+				7527DE20028C49345CF3C72F /* Pods_SDWebImage_iOS_Demo.framework */,
+				29A9D56D23804E7B2212CFA6 /* Pods_SDWebImage_Vision_Demo.framework */,
 			);
 			name = Frameworks;
 			sourceTree = "<group>";
@@ -470,43 +457,82 @@
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 			isa = PBXGroup;
 			children = (
-				537612A1155AB74D005750A4 /* SDWebImage Demo-Info.plist */,
+				537612A1155AB74D005750A4 /* Info.plist */,
 				537612A5155AB74D005750A4 /* main.m */,
-				537612A7155AB74D005750A4 /* SDWebImage Demo-Prefix.pch */,
 			);
 			name = "Supporting Files";
 			sourceTree = "<group>";
 		};
-		DA248D6D1954841D00390AB0 /* Products */ = {
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-				431739601CDFCC370008FEB9 /* SDWebImage.framework */,
-				4397D2751D0DDBE100BB2784 /* SDWebImage.framework */,
-				43A629E71D0DFD000089D7DD /* SDWebImage.framework */,
+				80C26B77F46D9332F328204E /* Pods-SDWebImage OSX Demo.debug.xcconfig */,
+				5992BFDBF29AB5CBCAC896FB /* Pods-SDWebImage OSX Demo.release.xcconfig */,
+				5A56E15AF819F64FBF1F65A9 /* Pods-SDWebImage TV Demo.debug.xcconfig */,
+				28B8C1BB2DCC32E213DA3DAD /* Pods-SDWebImage TV Demo.release.xcconfig */,
+				327E1C604113A7CEC9AC02DB /* Pods-SDWebImage Watch Demo Extension.debug.xcconfig */,
+				9A205232F437C77F45A2EBD1 /* Pods-SDWebImage Watch Demo Extension.release.xcconfig */,
+				789EDF4244C66933FDF3E181 /* Pods-SDWebImage iOS Demo.debug.xcconfig */,
+				0829378FA7103DD8649CCCF3 /* Pods-SDWebImage iOS Demo.release.xcconfig */,
+				87F946759088F4E41FDC806A /* Pods-SDWebImage Vision Demo.debug.xcconfig */,
+				11FB3839400DA48480ABA6BB /* Pods-SDWebImage Vision Demo.release.xcconfig */,
 			);
-			name = Products;
+			name = Pods;
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+				EA9E0C76219598B400AFB434 /* App-Release.xcconfig */,
+				EA9E0C78219598B400AFB434 /* App-Shared.xcconfig */,
+				EA9E0C77219598B400AFB434 /* Module-Debug.xcconfig */,
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+				EA9E0C79219598B400AFB434 /* Module-Shared.xcconfig */,
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+			path = ../Configs;
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+			buildPhases = (
+				FE8AF0F7620DD545CC0FDB06 /* [CP] Check Pods Manifest.lock */,
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+				3220E26C2B7B0755005F83A5 /* Resources */,
+				9896DB377881E964826851E6 /* [CP] Embed Pods Frameworks */,
+			);
+			buildRules = (
+			);
+			dependencies = (
+			);
+			name = "SDWebImage Vision Demo";
+			packageProductDependencies = (
+				3220E2722B7B0755005F83A5 /* RealityKitContent */,
+			);
+			productName = "SDWebImage Vision Demo";
+			productReference = 3220E26E2B7B0755005F83A5 /* SDWebImage Vision Demo.app */;
+			productType = "com.apple.product-type.application";
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 		4314D1A51D0E1181004B36C9 /* SDWebImage TV Demo */ = {
 			isa = PBXNativeTarget;
 			buildConfigurationList = 4314D1B71D0E1182004B36C9 /* Build configuration list for PBXNativeTarget "SDWebImage TV Demo" */;
 			buildPhases = (
+				B58F48B09636942C94CB9C9F /* [CP] Check Pods Manifest.lock */,
 				4314D1A21D0E1181004B36C9 /* Sources */,
 				4314D1A31D0E1181004B36C9 /* Frameworks */,
 				4314D1A41D0E1181004B36C9 /* Resources */,
 				327E2DE01FAF0D8000EF52C2 /* Embed Frameworks */,
+				79F9A2D3C039A7C473F3E579 /* [CP] Embed Pods Frameworks */,
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 			buildRules = (
 			);
 			dependencies = (
-				4314D1BB1D0E11A0004B36C9 /* PBXTargetDependency */,
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@@ -517,16 +543,16 @@
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 			buildConfigurationList = 43A629E81D0DFD000089D7DD /* Build configuration list for PBXNativeTarget "SDWebImage OSX Demo" */;
 			buildPhases = (
+				A50199B809E737E017D7DF1C /* [CP] Check Pods Manifest.lock */,
 				43A629CB1D0DFD000089D7DD /* Sources */,
 				43A629CC1D0DFD000089D7DD /* Frameworks */,
 				43A629CD1D0DFD000089D7DD /* Resources */,
 				327E2DD61FAF0D7000EF52C2 /* Embed Frameworks */,
+				4E998E1DF728CCAF009D92E4 /* [CP] Embed Pods Frameworks */,
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 			);
 			dependencies = (
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@@ -539,6 +565,7 @@
 			buildPhases = (
 				43A629EC1D0E07600089D7DD /* Resources */,
 				43A62A131D0E07600089D7DD /* Embed App Extensions */,
+				A3F8A0092FB9960BF0FFE3E0 /* Frameworks */,
 			);
 			buildRules = (
 			);
@@ -554,16 +581,16 @@
 			isa = PBXNativeTarget;
 			buildConfigurationList = 43A62A101D0E07600089D7DD /* Build configuration list for PBXNativeTarget "SDWebImage Watch Demo Extension" */;
 			buildPhases = (
+				B65A37AE44E8F76BEB656502 /* [CP] Check Pods Manifest.lock */,
 				43A629F61D0E07600089D7DD /* Sources */,
 				43A629F71D0E07600089D7DD /* Frameworks */,
 				43A629F81D0E07600089D7DD /* Resources */,
 				327E2DDB1FAF0D7A00EF52C2 /* Embed Frameworks */,
+				BE1C2969523FD5B0A6AC02A9 /* [CP] Embed Pods Frameworks */,
 			);
 			buildRules = (
 			);
 			dependencies = (
-				327E2DAF1FAF0A6B00EF52C2 /* PBXTargetDependency */,
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@@ -574,18 +601,18 @@
 			isa = PBXNativeTarget;
 			buildConfigurationList = 537612B9155AB74D005750A4 /* Build configuration list for PBXNativeTarget "SDWebImage iOS Demo" */;
 			buildPhases = (
+				FA507C7A3DC5CD9451511EB7 /* [CP] Check Pods Manifest.lock */,
 				53761291155AB74D005750A4 /* Sources */,
 				53761292155AB74D005750A4 /* Frameworks */,
 				53761293155AB74D005750A4 /* Resources */,
 				43A62A171D0E07600089D7DD /* Embed Watch Content */,
 				327E2DD11FAF0D6A00EF52C2 /* Embed Frameworks */,
+				3EE15CCA9FC9CD888D0A8221 /* [CP] Embed Pods Frameworks */,
 			);
 			buildRules = (
 			);
 			dependencies = (
 				43A62A0E1D0E07600089D7DD /* PBXTargetDependency */,
-				327E2DB41FAF0B3800EF52C2 /* PBXTargetDependency */,
-				327E2DD01FAF0D6A00EF52C2 /* PBXTargetDependency */,
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@@ -598,9 +625,13 @@
 		5376128C155AB74D005750A4 /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
-				LastUpgradeCheck = 0900;
+				LastSwiftUpdateCheck = 1520;
+				LastUpgradeCheck = 0940;
 				ORGANIZATIONNAME = Dailymotion;
 				TargetAttributes = {
+					3220E26D2B7B0755005F83A5 = {
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 					4314D1A51D0E1181004B36C9 = {
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@@ -617,7 +648,7 @@
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 			compatibilityVersion = "Xcode 3.2";
-			developmentRegion = English;
+			developmentRegion = en;
 			hasScannedForEncodings = 0;
 			knownRegions = (
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@@ -626,12 +657,6 @@
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 			targets = (
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@@ -639,56 +664,21 @@
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 				43A629F91D0E07600089D7DD /* SDWebImage Watch Demo Extension */,
 				4314D1A51D0E1181004B36C9 /* SDWebImage TV Demo */,
+				3220E26D2B7B0755005F83A5 /* SDWebImage Vision Demo */,
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 /* End PBXProject section */
 
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-			sourceTree = BUILT_PRODUCTS_DIR;
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-/* End PBXReferenceProxy section */
-
 /* Begin PBXResourcesBuildPhase section */
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+			buildActionMask = 2147483647;
+			files = (
+				3220E27C2B7B0755005F83A5 /* Preview Assets.xcassets in Resources */,
+				3220E2792B7B0755005F83A5 /* Assets.xcassets in Resources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
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 		4314D1A41D0E1181004B36C9 /* Resources */ = {
 			isa = PBXResourcesBuildPhase;
 			buildActionMask = 2147483647;
@@ -738,7 +728,222 @@
 		};
 /* End PBXResourcesBuildPhase section */
 
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+				"${BUILT_PRODUCTS_DIR}/SDWebImageWebPCoder-iOS/SDWebImageWebPCoder.framework",
+				"${BUILT_PRODUCTS_DIR}/libwebp-iOS/libwebp.framework",
+			);
+			name = "[CP] Embed Pods Frameworks";
+			outputPaths = (
+				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/SDWebImage.framework",
+				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/SDWebImageWebPCoder.framework",
+				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/libwebp.framework",
+			);
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+				"${BUILT_PRODUCTS_DIR}/SDWebImageWebPCoder-macOS/SDWebImageWebPCoder.framework",
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+			name = "[CP] Embed Pods Frameworks";
+			outputPaths = (
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+				"${BUILT_PRODUCTS_DIR}/SDWebImageWebPCoder-tvOS/SDWebImageWebPCoder.framework",
+				"${BUILT_PRODUCTS_DIR}/libwebp-tvOS/libwebp.framework",
+			);
+			name = "[CP] Embed Pods Frameworks";
+			outputPaths = (
+				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/SDWebImage.framework",
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+				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/libwebp.framework",
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+			shellPath = /bin/sh;
+			shellScript = "\"${PODS_ROOT}/Target Support Files/Pods-SDWebImage TV Demo/Pods-SDWebImage TV Demo-frameworks.sh\"\n";
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+				"${BUILT_PRODUCTS_DIR}/SDWebImageSwiftUI/SDWebImageSwiftUI.framework",
+			);
+			name = "[CP] Embed Pods Frameworks";
+			outputPaths = (
+				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/SDWebImage.framework",
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+			shellPath = /bin/sh;
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+			inputPaths = (
+				"${PODS_PODFILE_DIR_PATH}/Podfile.lock",
+				"${PODS_ROOT}/Manifest.lock",
+			);
+			name = "[CP] Check Pods Manifest.lock";
+			outputPaths = (
+				"$(DERIVED_FILE_DIR)/Pods-SDWebImage OSX Demo-checkManifestLockResult.txt",
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "diff \"${PODS_PODFILE_DIR_PATH}/Podfile.lock\" \"${PODS_ROOT}/Manifest.lock\" > /dev/null\nif [ $? != 0 ] ; then\n    # print error to STDERR\n    echo \"error: The sandbox is not in sync with the Podfile.lock. Run 'pod install' or update your CocoaPods installation.\" >&2\n    exit 1\nfi\n# This output is used by Xcode 'outputs' to avoid re-running this script phase.\necho \"SUCCESS\" > \"${SCRIPT_OUTPUT_FILE_0}\"\n";
+			showEnvVarsInLog = 0;
+		};
+		B58F48B09636942C94CB9C9F /* [CP] Check Pods Manifest.lock */ = {
+			isa = PBXShellScriptBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputPaths = (
+				"${PODS_PODFILE_DIR_PATH}/Podfile.lock",
+				"${PODS_ROOT}/Manifest.lock",
+			);
+			name = "[CP] Check Pods Manifest.lock";
+			outputPaths = (
+				"$(DERIVED_FILE_DIR)/Pods-SDWebImage TV Demo-checkManifestLockResult.txt",
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "diff \"${PODS_PODFILE_DIR_PATH}/Podfile.lock\" \"${PODS_ROOT}/Manifest.lock\" > /dev/null\nif [ $? != 0 ] ; then\n    # print error to STDERR\n    echo \"error: The sandbox is not in sync with the Podfile.lock. Run 'pod install' or update your CocoaPods installation.\" >&2\n    exit 1\nfi\n# This output is used by Xcode 'outputs' to avoid re-running this script phase.\necho \"SUCCESS\" > \"${SCRIPT_OUTPUT_FILE_0}\"\n";
+			showEnvVarsInLog = 0;
+		};
+		B65A37AE44E8F76BEB656502 /* [CP] Check Pods Manifest.lock */ = {
+			isa = PBXShellScriptBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputPaths = (
+				"${PODS_PODFILE_DIR_PATH}/Podfile.lock",
+				"${PODS_ROOT}/Manifest.lock",
+			);
+			name = "[CP] Check Pods Manifest.lock";
+			outputPaths = (
+				"$(DERIVED_FILE_DIR)/Pods-SDWebImage Watch Demo Extension-checkManifestLockResult.txt",
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "diff \"${PODS_PODFILE_DIR_PATH}/Podfile.lock\" \"${PODS_ROOT}/Manifest.lock\" > /dev/null\nif [ $? != 0 ] ; then\n    # print error to STDERR\n    echo \"error: The sandbox is not in sync with the Podfile.lock. Run 'pod install' or update your CocoaPods installation.\" >&2\n    exit 1\nfi\n# This output is used by Xcode 'outputs' to avoid re-running this script phase.\necho \"SUCCESS\" > \"${SCRIPT_OUTPUT_FILE_0}\"\n";
+			showEnvVarsInLog = 0;
+		};
+		BE1C2969523FD5B0A6AC02A9 /* [CP] Embed Pods Frameworks */ = {
+			isa = PBXShellScriptBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputPaths = (
+				"${PODS_ROOT}/Target Support Files/Pods-SDWebImage Watch Demo Extension/Pods-SDWebImage Watch Demo Extension-frameworks.sh",
+				"${BUILT_PRODUCTS_DIR}/SDWebImage-Core/SDWebImage.framework",
+				"${BUILT_PRODUCTS_DIR}/SDWebImageWebPCoder-watchOS/SDWebImageWebPCoder.framework",
+				"${BUILT_PRODUCTS_DIR}/libwebp-watchOS/libwebp.framework",
+			);
+			name = "[CP] Embed Pods Frameworks";
+			outputPaths = (
+				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/SDWebImage.framework",
+				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/SDWebImageWebPCoder.framework",
+				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/libwebp.framework",
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "\"${PODS_ROOT}/Target Support Files/Pods-SDWebImage Watch Demo Extension/Pods-SDWebImage Watch Demo Extension-frameworks.sh\"\n";
+			showEnvVarsInLog = 0;
+		};
+		FA507C7A3DC5CD9451511EB7 /* [CP] Check Pods Manifest.lock */ = {
+			isa = PBXShellScriptBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputPaths = (
+				"${PODS_PODFILE_DIR_PATH}/Podfile.lock",
+				"${PODS_ROOT}/Manifest.lock",
+			);
+			name = "[CP] Check Pods Manifest.lock";
+			outputPaths = (
+				"$(DERIVED_FILE_DIR)/Pods-SDWebImage iOS Demo-checkManifestLockResult.txt",
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "diff \"${PODS_PODFILE_DIR_PATH}/Podfile.lock\" \"${PODS_ROOT}/Manifest.lock\" > /dev/null\nif [ $? != 0 ] ; then\n    # print error to STDERR\n    echo \"error: The sandbox is not in sync with the Podfile.lock. Run 'pod install' or update your CocoaPods installation.\" >&2\n    exit 1\nfi\n# This output is used by Xcode 'outputs' to avoid re-running this script phase.\necho \"SUCCESS\" > \"${SCRIPT_OUTPUT_FILE_0}\"\n";
+			showEnvVarsInLog = 0;
+		};
+		FE8AF0F7620DD545CC0FDB06 /* [CP] Check Pods Manifest.lock */ = {
+			isa = PBXShellScriptBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputFileListPaths = (
+			);
+			inputPaths = (
+				"${PODS_PODFILE_DIR_PATH}/Podfile.lock",
+				"${PODS_ROOT}/Manifest.lock",
+			);
+			name = "[CP] Check Pods Manifest.lock";
+			outputFileListPaths = (
+			);
+			outputPaths = (
+				"$(DERIVED_FILE_DIR)/Pods-SDWebImage Vision Demo-checkManifestLockResult.txt",
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "diff \"${PODS_PODFILE_DIR_PATH}/Podfile.lock\" \"${PODS_ROOT}/Manifest.lock\" > /dev/null\nif [ $? != 0 ] ; then\n    # print error to STDERR\n    echo \"error: The sandbox is not in sync with the Podfile.lock. Run 'pod install' or update your CocoaPods installation.\" >&2\n    exit 1\nfi\n# This output is used by Xcode 'outputs' to avoid re-running this script phase.\necho \"SUCCESS\" > \"${SCRIPT_OUTPUT_FILE_0}\"\n";
+			showEnvVarsInLog = 0;
+		};
+/* End PBXShellScriptBuildPhase section */
+
 /* Begin PBXSourcesBuildPhase section */
+		3220E26A2B7B0755005F83A5 /* Sources */ = {
+			isa = PBXSourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				3220E2772B7B0755005F83A5 /* ContentView.swift in Sources */,
+				32464A842B7B0C30006BE70E /* DetailView.swift in Sources */,
+				3220E2752B7B0755005F83A5 /* App.swift in Sources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 		4314D1A21D0E1181004B36C9 /* Sources */ = {
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
@@ -754,6 +959,7 @@
 			buildActionMask = 2147483647;
 			files = (
 				43A629D91D0DFD000089D7DD /* ViewController.m in Sources */,
+				328CA3AB29980A840063950F /* WindowController.m in Sources */,
 				43A629D61D0DFD000089D7DD /* main.m in Sources */,
 				43A629D31D0DFD000089D7DD /* AppDelegate.m in Sources */,
 			);
@@ -783,46 +989,6 @@
 /* End PBXSourcesBuildPhase section */
 
 /* Begin PBXTargetDependency section */
-		327E2DAF1FAF0A6B00EF52C2 /* PBXTargetDependency */ = {
-			isa = PBXTargetDependency;
-			name = "SDWebImage watchOS";
-			targetProxy = 327E2DAE1FAF0A6B00EF52C2 /* PBXContainerItemProxy */;
-		};
-		327E2DB41FAF0B3800EF52C2 /* PBXTargetDependency */ = {
-			isa = PBXTargetDependency;
-			name = "SDWebImage iOS";
-			targetProxy = 327E2DB31FAF0B3800EF52C2 /* PBXContainerItemProxy */;
-		};
-		327E2DD01FAF0D6A00EF52C2 /* PBXTargetDependency */ = {
-			isa = PBXTargetDependency;
-			name = "SDWebImage iOS";
-			targetProxy = 327E2DCF1FAF0D6A00EF52C2 /* PBXContainerItemProxy */;
-		};
-		327E2DD51FAF0D7000EF52C2 /* PBXTargetDependency */ = {
-			isa = PBXTargetDependency;
-			name = "SDWebImage OSX";
-			targetProxy = 327E2DD41FAF0D7000EF52C2 /* PBXContainerItemProxy */;
-		};
-		327E2DDA1FAF0D7900EF52C2 /* PBXTargetDependency */ = {
-			isa = PBXTargetDependency;
-			name = "SDWebImage watchOS";
-			targetProxy = 327E2DD91FAF0D7900EF52C2 /* PBXContainerItemProxy */;
-		};
-		327E2DDF1FAF0D8000EF52C2 /* PBXTargetDependency */ = {
-			isa = PBXTargetDependency;
-			name = "SDWebImage tvOS";
-			targetProxy = 327E2DDE1FAF0D8000EF52C2 /* PBXContainerItemProxy */;
-		};
-		4314D1BB1D0E11A0004B36C9 /* PBXTargetDependency */ = {
-			isa = PBXTargetDependency;
-			name = "SDWebImage tvOS";
-			targetProxy = 4314D1BA1D0E11A0004B36C9 /* PBXContainerItemProxy */;
-		};
-		43A629EA1D0DFDCA0089D7DD /* PBXTargetDependency */ = {
-			isa = PBXTargetDependency;
-			name = "SDWebImage OSX";
-			targetProxy = 43A629E91D0DFDCA0089D7DD /* PBXContainerItemProxy */;
-		};
 		43A629FD1D0E07600089D7DD /* PBXTargetDependency */ = {
 			isa = PBXTargetDependency;
 			target = 43A629F91D0E07600089D7DD /* SDWebImage Watch Demo Extension */;
@@ -830,6 +996,7 @@
 		};
 		43A62A0E1D0E07600089D7DD /* PBXTargetDependency */ = {
 			isa = PBXTargetDependency;
+			platformFilter = ios;
 			target = 43A629ED1D0E07600089D7DD /* SDWebImage Watch Demo */;
 			targetProxy = 43A62A0D1D0E07600089D7DD /* PBXContainerItemProxy */;
 		};
@@ -879,465 +1046,331 @@
 /* End PBXVariantGroup section */
 
 /* Begin XCBuildConfiguration section */
-		4314D1B81D0E1182004B36C9 /* Debug */ = {
+		3220E27E2B7B0755005F83A5 /* Debug */ = {
 			isa = XCBuildConfiguration;
+			baseConfigurationReference = 87F946759088F4E41FDC806A /* Pods-SDWebImage Vision Demo.debug.xcconfig */;
 			buildSettings = {
-				ASSETCATALOG_COMPILER_APPICON_NAME = "App Icon & Top Shelf Image";
-				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				ASSETCATALOG_COMPILER_GENERATE_SWIFT_ASSET_SYMBOL_EXTENSIONS = YES;
+				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CLANG_ANALYZER_NONNULL = YES;
-				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
-				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++20";
 				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_ENABLE_OBJC_WEAK = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
 				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
 				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
+				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				CODE_SIGN_STYLE = Automatic;
+				COPY_PHASE_STRIP = NO;
+				CURRENT_PROJECT_VERSION = 1;
 				DEBUG_INFORMATION_FORMAT = dwarf;
+				DEVELOPMENT_ASSET_PATHS = "\"SDWebImage Vision Demo/Preview Content\"";
+				ENABLE_PREVIEWS = YES;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
-				GCC_C_LANGUAGE_STANDARD = gnu99;
+				ENABLE_TESTABILITY = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu17;
+				GCC_DYNAMIC_NO_PIC = NO;
 				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_OPTIMIZATION_LEVEL = 0;
+				GCC_PREPROCESSOR_DEFINITIONS = (
+					"DEBUG=1",
+					"$(inherited)",
+				);
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
-				INFOPLIST_FILE = "SDWebImage TV Demo/Info.plist";
-				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
-				MTL_ENABLE_DEBUG_INFO = YES;
-				PRODUCT_BUNDLE_IDENTIFIER = "com.dailymotion.SDWebImage-TV-Demo";
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				GENERATE_INFOPLIST_FILE = YES;
+				INFOPLIST_FILE = "$(TARGET_NAME)/Info.plist";
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				LOCALIZATION_PREFERS_STRING_CATALOGS = YES;
+				MARKETING_VERSION = 1.0;
+				MTL_ENABLE_DEBUG_INFO = INCLUDE_SOURCE;
+				MTL_FAST_MATH = YES;
+				ONLY_ACTIVE_ARCH = YES;
+				PRODUCT_BUNDLE_IDENTIFIER = "com.dailymotion.SDWebImage-Vision-Demo";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SDKROOT = appletvos;
-				TARGETED_DEVICE_FAMILY = 3;
-				TVOS_DEPLOYMENT_TARGET = 9.0;
+				SDKROOT = xros;
+				SUPPORTED_PLATFORMS = "xros xrsimulator";
+				SWIFT_ACTIVE_COMPILATION_CONDITIONS = "DEBUG $(inherited)";
+				SWIFT_EMIT_LOC_STRINGS = YES;
+				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = "1,2,7";
+				XROS_DEPLOYMENT_TARGET = 1.0;
 			};
 			name = Debug;
 		};
-		4314D1B91D0E1182004B36C9 /* Release */ = {
+		3220E27F2B7B0755005F83A5 /* Release */ = {
 			isa = XCBuildConfiguration;
+			baseConfigurationReference = 11FB3839400DA48480ABA6BB /* Pods-SDWebImage Vision Demo.release.xcconfig */;
 			buildSettings = {
-				ASSETCATALOG_COMPILER_APPICON_NAME = "App Icon & Top Shelf Image";
-				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				ASSETCATALOG_COMPILER_GENERATE_SWIFT_ASSET_SYMBOL_EXTENSIONS = YES;
+				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CLANG_ANALYZER_NONNULL = YES;
-				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
-				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++20";
 				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_ENABLE_OBJC_WEAK = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
 				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
 				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
+				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				CODE_SIGN_STYLE = Automatic;
 				COPY_PHASE_STRIP = NO;
+				CURRENT_PROJECT_VERSION = 1;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
+				DEVELOPMENT_ASSET_PATHS = "\"SDWebImage Vision Demo/Preview Content\"";
 				ENABLE_NS_ASSERTIONS = NO;
+				ENABLE_PREVIEWS = YES;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
-				GCC_C_LANGUAGE_STANDARD = gnu99;
+				GCC_C_LANGUAGE_STANDARD = gnu17;
 				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
-				INFOPLIST_FILE = "SDWebImage TV Demo/Info.plist";
-				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				GENERATE_INFOPLIST_FILE = YES;
+				INFOPLIST_FILE = "$(TARGET_NAME)/Info.plist";
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				LOCALIZATION_PREFERS_STRING_CATALOGS = YES;
+				MARKETING_VERSION = 1.0;
 				MTL_ENABLE_DEBUG_INFO = NO;
-				PRODUCT_BUNDLE_IDENTIFIER = "com.dailymotion.SDWebImage-TV-Demo";
+				MTL_FAST_MATH = YES;
+				PRODUCT_BUNDLE_IDENTIFIER = "com.dailymotion.SDWebImage-Vision-Demo";
 				PRODUCT_NAME = "$(TARGET_NAME)";
+				SDKROOT = xros;
+				SUPPORTED_PLATFORMS = "xros xrsimulator";
+				SWIFT_COMPILATION_MODE = wholemodule;
+				SWIFT_EMIT_LOC_STRINGS = YES;
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = "1,2,7";
+				VALIDATE_PRODUCT = YES;
+				XROS_DEPLOYMENT_TARGET = 1.0;
+			};
+			name = Release;
+		};
+		4314D1B81D0E1182004B36C9 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			baseConfigurationReference = 5A56E15AF819F64FBF1F65A9 /* Pods-SDWebImage TV Demo.debug.xcconfig */;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = "App Icon & Top Shelf Image";
+				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
+				INFOPLIST_FILE = "SDWebImage TV Demo/Info.plist";
+				PRODUCT_BUNDLE_IDENTIFIER = "com.dailymotion.SDWebImage-TV-Demo";
+				SDKROOT = appletvos;
+				SUPPORTED_PLATFORMS = "appletvsimulator appletvos";
+				TARGETED_DEVICE_FAMILY = 3;
+			};
+			name = Debug;
+		};
+		4314D1B91D0E1182004B36C9 /* Release */ = {
+			isa = XCBuildConfiguration;
+			baseConfigurationReference = 28B8C1BB2DCC32E213DA3DAD /* Pods-SDWebImage TV Demo.release.xcconfig */;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = "App Icon & Top Shelf Image";
+				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
+				INFOPLIST_FILE = "SDWebImage TV Demo/Info.plist";
+				PRODUCT_BUNDLE_IDENTIFIER = "com.dailymotion.SDWebImage-TV-Demo";
 				SDKROOT = appletvos;
+				SUPPORTED_PLATFORMS = "appletvsimulator appletvos";
 				TARGETED_DEVICE_FAMILY = 3;
-				TVOS_DEPLOYMENT_TARGET = 9.0;
 			};
 			name = Release;
 		};
 		43A629E01D0DFD000089D7DD /* Debug */ = {
 			isa = XCBuildConfiguration;
+			baseConfigurationReference = 80C26B77F46D9332F328204E /* Pods-SDWebImage OSX Demo.debug.xcconfig */;
 			buildSettings = {
-				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
-				CLANG_ANALYZER_NONNULL = YES;
-				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
-				CLANG_CXX_LIBRARY = "libc++";
-				CLANG_ENABLE_MODULES = YES;
-				CLANG_WARN_BOOL_CONVERSION = YES;
-				CLANG_WARN_CONSTANT_CONVERSION = YES;
-				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
-				CLANG_WARN_EMPTY_BODY = YES;
-				CLANG_WARN_ENUM_CONVERSION = YES;
-				CLANG_WARN_INT_CONVERSION = YES;
-				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
-				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
-				CLANG_WARN_UNREACHABLE_CODE = YES;
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+				LD_RUNPATH_SEARCH_PATHS = (
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+				SUPPORTED_PLATFORMS = "watchsimulator watchos";
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-				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = watchos;
-				SKIP_INSTALL = YES;
+				SUPPORTED_PLATFORMS = "watchsimulator watchos";
 				TARGETED_DEVICE_FAMILY = 4;
-				WATCHOS_DEPLOYMENT_TARGET = 2.0;
 			};
 			name = Debug;
 		};
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-				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = watchos;
-				SKIP_INSTALL = YES;
+				SUPPORTED_PLATFORMS = "watchsimulator watchos";
 				TARGETED_DEVICE_FAMILY = 4;
-				WATCHOS_DEPLOYMENT_TARGET = 2.0;
 			};
 			name = Release;
 		};
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 			isa = XCBuildConfiguration;
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 			isa = XCBuildConfiguration;
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 		};
 		537612BA155AB74D005750A4 /* Debug */ = {
 			isa = XCBuildConfiguration;
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-				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
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 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
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-				PRODUCT_BUNDLE_IDENTIFIER = "com.dailymotion.${PRODUCT_NAME:rfc1034identifier}";
-				PRODUCT_NAME = "$(TARGET_NAME)";
+				INFOPLIST_FILE = "SDWebImage Demo/Info.plist";
 				SDKROOT = iphoneos;
-				WRAPPER_EXTENSION = app;
+				SUPPORTED_PLATFORMS = "iphonesimulator iphoneos";
+				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
 		};
 		537612BB155AB74D005750A4 /* Release */ = {
 			isa = XCBuildConfiguration;
+			baseConfigurationReference = 0829378FA7103DD8649CCCF3 /* Pods-SDWebImage iOS Demo.release.xcconfig */;
 			buildSettings = {
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-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
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-				OTHER_LDFLAGS = "-ObjC";
-				PRODUCT_BUNDLE_IDENTIFIER = "com.dailymotion.${PRODUCT_NAME:rfc1034identifier}";
-				PRODUCT_NAME = "$(TARGET_NAME)";
+				INFOPLIST_FILE = "SDWebImage Demo/Info.plist";
 				SDKROOT = iphoneos;
-				WRAPPER_EXTENSION = app;
+				SUPPORTED_PLATFORMS = "iphonesimulator iphoneos";
+				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;
 		};
 /* End XCBuildConfiguration section */
 
 /* Begin XCConfigurationList section */
+		3220E2802B7B0755005F83A5 /* Build configuration list for PBXNativeTarget "SDWebImage Vision Demo" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				3220E27E2B7B0755005F83A5 /* Debug */,
+				3220E27F2B7B0755005F83A5 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
 		4314D1B71D0E1182004B36C9 /* Build configuration list for PBXNativeTarget "SDWebImage TV Demo" */ = {
 			isa = XCConfigurationList;
 			buildConfigurations = (
@@ -1393,6 +1426,13 @@
 			defaultConfigurationName = Release;
 		};
 /* End XCConfigurationList section */
+
+/* Begin XCSwiftPackageProductDependency section */
+		3220E2722B7B0755005F83A5 /* RealityKitContent */ = {
+			isa = XCSwiftPackageProductDependency;
+			productName = RealityKitContent;
+		};
+/* End XCSwiftPackageProductDependency section */
 	};
 	rootObject = 5376128C155AB74D005750A4 /* Project object */;
 }
diff --git a/Examples/SDWebImage Demo.xcodeproj/xcshareddata/xcschemes/SDWebImage OSX Demo.xcscheme b/Examples/SDWebImage Demo.xcodeproj/xcshareddata/xcschemes/SDWebImage OSX Demo.xcscheme
index c0915c9f2..4aba9bfbb 100644
--- a/Examples/SDWebImage Demo.xcodeproj/xcshareddata/xcschemes/SDWebImage OSX Demo.xcscheme	
+++ b/Examples/SDWebImage Demo.xcodeproj/xcshareddata/xcschemes/SDWebImage OSX Demo.xcscheme	
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0920"
+   LastUpgradeVersion = "1020"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -26,7 +26,6 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
       shouldUseLaunchSchemeArgsEnv = "YES">
       <Testables>
       </Testables>
@@ -46,7 +45,6 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
       launchStyle = "0"
       useCustomWorkingDirectory = "NO"
       ignoresPersistentStateOnLaunch = "NO"
@@ -63,13 +61,6 @@
             ReferencedContainer = "container:SDWebImage Demo.xcodeproj">
          </BuildableReference>
       </BuildableProductRunnable>
-      <EnvironmentVariables>
-         <EnvironmentVariable
-            key = "OS_ACTIVITY_MODE"
-            value = "disable"
-            isEnabled = "YES">
-         </EnvironmentVariable>
-      </EnvironmentVariables>
       <AdditionalOptions>
       </AdditionalOptions>
    </LaunchAction>
diff --git a/Examples/SDWebImage Demo.xcodeproj/xcshareddata/xcschemes/SDWebImage TV Demo.xcscheme b/Examples/SDWebImage Demo.xcodeproj/xcshareddata/xcschemes/SDWebImage TV Demo.xcscheme
index 07dc4c0c6..a36ad8875 100644
--- a/Examples/SDWebImage Demo.xcodeproj/xcshareddata/xcschemes/SDWebImage TV Demo.xcscheme	
+++ b/Examples/SDWebImage Demo.xcodeproj/xcshareddata/xcschemes/SDWebImage TV Demo.xcscheme	
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0920"
+   LastUpgradeVersion = "1020"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -26,7 +26,6 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
       shouldUseLaunchSchemeArgsEnv = "YES">
       <Testables>
       </Testables>
@@ -46,7 +45,6 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
       launchStyle = "0"
       useCustomWorkingDirectory = "NO"
       ignoresPersistentStateOnLaunch = "NO"
@@ -63,13 +61,6 @@
             ReferencedContainer = "container:SDWebImage Demo.xcodeproj">
          </BuildableReference>
       </BuildableProductRunnable>
-      <EnvironmentVariables>
-         <EnvironmentVariable
-            key = "OS_ACTIVITY_MODE"
-            value = "disable"
-            isEnabled = "YES">
-         </EnvironmentVariable>
-      </EnvironmentVariables>
       <AdditionalOptions>
       </AdditionalOptions>
    </LaunchAction>
diff --git a/SDWebImage.xcodeproj/xcshareddata/xcschemes/SDWebImage watchOS.xcscheme b/Examples/SDWebImage Demo.xcodeproj/xcshareddata/xcschemes/SDWebImage Vision Demo.xcscheme
similarity index 63%
rename from SDWebImage.xcodeproj/xcshareddata/xcschemes/SDWebImage watchOS.xcscheme
rename to Examples/SDWebImage Demo.xcodeproj/xcshareddata/xcschemes/SDWebImage Vision Demo.xcscheme
index 3ee46b83f..ac70dbbb5 100644
--- a/SDWebImage.xcodeproj/xcshareddata/xcschemes/SDWebImage watchOS.xcscheme	
+++ b/Examples/SDWebImage Demo.xcodeproj/xcshareddata/xcschemes/SDWebImage Vision Demo.xcscheme	
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0920"
-   version = "1.3">
+   LastUpgradeVersion = "1520"
+   version = "1.7">
    <BuildAction
       parallelizeBuildables = "YES"
       buildImplicitDependencies = "YES">
@@ -14,10 +14,10 @@
             buildForAnalyzing = "YES">
             <BuildableReference
                BuildableIdentifier = "primary"
-               BlueprintIdentifier = "431BB6891D06D2C1006A3455"
-               BuildableName = "SDWebImage.framework"
-               BlueprintName = "SDWebImage watchOS"
-               ReferencedContainer = "container:SDWebImage.xcodeproj">
+               BlueprintIdentifier = "3220E26D2B7B0755005F83A5"
+               BuildableName = "SDWebImage Vision Demo.app"
+               BlueprintName = "SDWebImage Vision Demo"
+               ReferencedContainer = "container:SDWebImage Demo.xcodeproj">
             </BuildableReference>
          </BuildActionEntry>
       </BuildActionEntries>
@@ -26,35 +26,29 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
-      shouldUseLaunchSchemeArgsEnv = "YES">
-      <Testables>
-      </Testables>
-      <AdditionalOptions>
-      </AdditionalOptions>
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      shouldAutocreateTestPlan = "YES">
    </TestAction>
    <LaunchAction
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
       launchStyle = "0"
       useCustomWorkingDirectory = "NO"
       ignoresPersistentStateOnLaunch = "NO"
       debugDocumentVersioning = "YES"
       debugServiceExtension = "internal"
       allowLocationSimulation = "YES">
-      <MacroExpansion>
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
          <BuildableReference
             BuildableIdentifier = "primary"
-            BlueprintIdentifier = "431BB6891D06D2C1006A3455"
-            BuildableName = "SDWebImage.framework"
-            BlueprintName = "SDWebImage watchOS"
-            ReferencedContainer = "container:SDWebImage.xcodeproj">
+            BlueprintIdentifier = "3220E26D2B7B0755005F83A5"
+            BuildableName = "SDWebImage Vision Demo.app"
+            BlueprintName = "SDWebImage Vision Demo"
+            ReferencedContainer = "container:SDWebImage Demo.xcodeproj">
          </BuildableReference>
-      </MacroExpansion>
-      <AdditionalOptions>
-      </AdditionalOptions>
+      </BuildableProductRunnable>
    </LaunchAction>
    <ProfileAction
       buildConfiguration = "Release"
@@ -62,15 +56,16 @@
       savedToolIdentifier = ""
       useCustomWorkingDirectory = "NO"
       debugDocumentVersioning = "YES">
-      <MacroExpansion>
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
          <BuildableReference
             BuildableIdentifier = "primary"
-            BlueprintIdentifier = "431BB6891D06D2C1006A3455"
-            BuildableName = "SDWebImage.framework"
-            BlueprintName = "SDWebImage watchOS"
-            ReferencedContainer = "container:SDWebImage.xcodeproj">
+            BlueprintIdentifier = "3220E26D2B7B0755005F83A5"
+            BuildableName = "SDWebImage Vision Demo.app"
+            BlueprintName = "SDWebImage Vision Demo"
+            ReferencedContainer = "container:SDWebImage Demo.xcodeproj">
          </BuildableReference>
-      </MacroExpansion>
+      </BuildableProductRunnable>
    </ProfileAction>
    <AnalyzeAction
       buildConfiguration = "Debug">
diff --git a/Examples/SDWebImage Demo.xcodeproj/xcshareddata/xcschemes/SDWebImage Watch Demo.xcscheme b/Examples/SDWebImage Demo.xcodeproj/xcshareddata/xcschemes/SDWebImage Watch Demo.xcscheme
index 7b6f8fb57..b37f9df36 100644
--- a/Examples/SDWebImage Demo.xcodeproj/xcshareddata/xcschemes/SDWebImage Watch Demo.xcscheme	
+++ b/Examples/SDWebImage Demo.xcodeproj/xcshareddata/xcschemes/SDWebImage Watch Demo.xcscheme	
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0920"
+   LastUpgradeVersion = "1020"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -54,27 +54,14 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
       shouldUseLaunchSchemeArgsEnv = "YES">
       <Testables>
       </Testables>
-      <MacroExpansion>
-         <BuildableReference
-            BuildableIdentifier = "primary"
-            BlueprintIdentifier = "43A629ED1D0E07600089D7DD"
-            BuildableName = "SDWebImage Watch Demo.app"
-            BlueprintName = "SDWebImage Watch Demo"
-            ReferencedContainer = "container:SDWebImage Demo.xcodeproj">
-         </BuildableReference>
-      </MacroExpansion>
-      <AdditionalOptions>
-      </AdditionalOptions>
    </TestAction>
    <LaunchAction
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
       launchStyle = "0"
       useCustomWorkingDirectory = "NO"
       ignoresPersistentStateOnLaunch = "NO"
@@ -82,10 +69,8 @@
       debugServiceExtension = "internal"
       allowLocationSimulation = "YES"
       notificationPayloadFile = "SDWebImage Watch Demo Extension/PushNotificationPayload.apns">
-      <RemoteRunnable
-         runnableDebuggingMode = "2"
-         BundleIdentifier = "com.apple.carousel"
-         RemotePath = "/SDWebImage iOS Demo">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
          <BuildableReference
             BuildableIdentifier = "primary"
             BlueprintIdentifier = "43A629ED1D0E07600089D7DD"
@@ -93,25 +78,7 @@
             BlueprintName = "SDWebImage Watch Demo"
             ReferencedContainer = "container:SDWebImage Demo.xcodeproj">
          </BuildableReference>
-      </RemoteRunnable>
-      <MacroExpansion>
-         <BuildableReference
-            BuildableIdentifier = "primary"
-            BlueprintIdentifier = "43A629ED1D0E07600089D7DD"
-            BuildableName = "SDWebImage Watch Demo.app"
-            BlueprintName = "SDWebImage Watch Demo"
-            ReferencedContainer = "container:SDWebImage Demo.xcodeproj">
-         </BuildableReference>
-      </MacroExpansion>
-      <EnvironmentVariables>
-         <EnvironmentVariable
-            key = "OS_ACTIVITY_MODE"
-            value = "disable"
-            isEnabled = "YES">
-         </EnvironmentVariable>
-      </EnvironmentVariables>
-      <AdditionalOptions>
-      </AdditionalOptions>
+      </BuildableProductRunnable>
    </LaunchAction>
    <ProfileAction
       buildConfiguration = "Release"
@@ -119,19 +86,8 @@
       savedToolIdentifier = ""
       useCustomWorkingDirectory = "NO"
       debugDocumentVersioning = "YES">
-      <RemoteRunnable
-         runnableDebuggingMode = "2"
-         BundleIdentifier = "com.apple.carousel"
-         RemotePath = "/SDWebImage iOS Demo">
-         <BuildableReference
-            BuildableIdentifier = "primary"
-            BlueprintIdentifier = "43A629ED1D0E07600089D7DD"
-            BuildableName = "SDWebImage Watch Demo.app"
-            BlueprintName = "SDWebImage Watch Demo"
-            ReferencedContainer = "container:SDWebImage Demo.xcodeproj">
-         </BuildableReference>
-      </RemoteRunnable>
-      <MacroExpansion>
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
          <BuildableReference
             BuildableIdentifier = "primary"
             BlueprintIdentifier = "43A629ED1D0E07600089D7DD"
@@ -139,7 +95,7 @@
             BlueprintName = "SDWebImage Watch Demo"
             ReferencedContainer = "container:SDWebImage Demo.xcodeproj">
          </BuildableReference>
-      </MacroExpansion>
+      </BuildableProductRunnable>
    </ProfileAction>
    <AnalyzeAction
       buildConfiguration = "Debug">
diff --git a/SDWebImage.xcworkspace/xcshareddata/xcschemes/SDWebImage iOS Demo.xcscheme b/Examples/SDWebImage Demo.xcodeproj/xcshareddata/xcschemes/SDWebImage iOS Demo.xcscheme
similarity index 83%
rename from SDWebImage.xcworkspace/xcshareddata/xcschemes/SDWebImage iOS Demo.xcscheme
rename to Examples/SDWebImage Demo.xcodeproj/xcshareddata/xcschemes/SDWebImage iOS Demo.xcscheme
index b7da40630..881ef7e85 100644
--- a/SDWebImage.xcworkspace/xcshareddata/xcschemes/SDWebImage iOS Demo.xcscheme	
+++ b/Examples/SDWebImage Demo.xcodeproj/xcshareddata/xcschemes/SDWebImage iOS Demo.xcscheme	
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0920"
+   LastUpgradeVersion = "1020"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -17,7 +17,7 @@
                BlueprintIdentifier = "53761294155AB74D005750A4"
                BuildableName = "SDWebImage iOS Demo.app"
                BlueprintName = "SDWebImage iOS Demo"
-               ReferencedContainer = "container:Examples/SDWebImage Demo.xcodeproj">
+               ReferencedContainer = "container:SDWebImage Demo.xcodeproj">
             </BuildableReference>
          </BuildActionEntry>
       </BuildActionEntries>
@@ -26,7 +26,6 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
       shouldUseLaunchSchemeArgsEnv = "YES">
       <Testables>
       </Testables>
@@ -36,7 +35,7 @@
             BlueprintIdentifier = "53761294155AB74D005750A4"
             BuildableName = "SDWebImage iOS Demo.app"
             BlueprintName = "SDWebImage iOS Demo"
-            ReferencedContainer = "container:Examples/SDWebImage Demo.xcodeproj">
+            ReferencedContainer = "container:SDWebImage Demo.xcodeproj">
          </BuildableReference>
       </MacroExpansion>
       <AdditionalOptions>
@@ -46,7 +45,6 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
       launchStyle = "0"
       useCustomWorkingDirectory = "NO"
       ignoresPersistentStateOnLaunch = "NO"
@@ -60,16 +58,9 @@
             BlueprintIdentifier = "53761294155AB74D005750A4"
             BuildableName = "SDWebImage iOS Demo.app"
             BlueprintName = "SDWebImage iOS Demo"
-            ReferencedContainer = "container:Examples/SDWebImage Demo.xcodeproj">
+            ReferencedContainer = "container:SDWebImage Demo.xcodeproj">
          </BuildableReference>
       </BuildableProductRunnable>
-      <EnvironmentVariables>
-         <EnvironmentVariable
-            key = "OS_ACTIVITY_MODE"
-            value = "default"
-            isEnabled = "YES">
-         </EnvironmentVariable>
-      </EnvironmentVariables>
       <AdditionalOptions>
       </AdditionalOptions>
    </LaunchAction>
@@ -86,7 +77,7 @@
             BlueprintIdentifier = "53761294155AB74D005750A4"
             BuildableName = "SDWebImage iOS Demo.app"
             BlueprintName = "SDWebImage iOS Demo"
-            ReferencedContainer = "container:Examples/SDWebImage Demo.xcodeproj">
+            ReferencedContainer = "container:SDWebImage Demo.xcodeproj">
          </BuildableReference>
       </BuildableProductRunnable>
    </ProfileAction>
diff --git a/Examples/SDWebImage Demo/AppDelegate.m b/Examples/SDWebImage Demo/AppDelegate.m
index a7c475981..c74540625 100644
--- a/Examples/SDWebImage Demo/AppDelegate.m	
+++ b/Examples/SDWebImage Demo/AppDelegate.m	
@@ -7,10 +7,10 @@
  */
 
 #import "AppDelegate.h"
-
 #import "MasterViewController.h"
 
-#import <SDWebImage/SDImageCache.h>
+#import <SDWebImage/SDWebImage.h>
+#import <SDWebImageWebPCoder/SDWebImageWebPCoder.h>
 
 @implementation AppDelegate
 
@@ -21,7 +21,22 @@ - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(
 {
     //Add a custom read-only cache path
     NSString *bundledPath = [[NSBundle mainBundle].resourcePath stringByAppendingPathComponent:@"CustomPathImages"];
-    [[SDImageCache sharedImageCache] addReadOnlyCachePath:bundledPath];
+    [SDImageCache sharedImageCache].additionalCachePathBlock = ^NSString * _Nullable(NSString * _Nonnull key) {
+        NSString *fileName = [[SDImageCache sharedImageCache] cachePathForKey:key].lastPathComponent;
+        return [bundledPath stringByAppendingPathComponent:fileName.stringByDeletingPathExtension];
+    };
+    
+    if (@available(iOS 14, tvOS 14, macOS 11, watchOS 7, *)) {
+        // iOS 14 supports WebP built-in
+        [[SDImageCodersManager sharedManager] addCoder:[SDImageAWebPCoder sharedCoder]];
+    } else {
+        // iOS 13 does not supports WebP, use third-party codec
+        [[SDImageCodersManager sharedManager] addCoder:[SDImageWebPCoder sharedCoder]];
+    }
+    if (@available(iOS 13, tvOS 13, macOS 10.15, watchOS 6, *)) {
+        // For HEIC animated image. Animated image is new introduced in iOS 13, but it contains performance issue for now.
+        [[SDImageCodersManager sharedManager] addCoder:[SDImageHEICCoder sharedCoder]];
+    }
 
     self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
     // Override point for customization after application launch.
diff --git a/Examples/SDWebImage Demo/DetailViewController.m b/Examples/SDWebImage Demo/DetailViewController.m
index 29656a5c5..1d2704aeb 100644
--- a/Examples/SDWebImage Demo/DetailViewController.m	
+++ b/Examples/SDWebImage Demo/DetailViewController.m	
@@ -7,81 +7,84 @@
  */
 
 #import "DetailViewController.h"
-#import <SDWebImage/FLAnimatedImageView.h>
-#import <SDWebImage/FLAnimatedImageView+WebCache.h>
+#import <SDWebImage/SDWebImage.h>
 
 @interface DetailViewController ()
 
-@property (strong, nonatomic) IBOutlet FLAnimatedImageView *imageView;
-@property (strong, nonatomic) UIActivityIndicatorView *activityIndicator;
-@property (strong, nonatomic) UIProgressView *progressView;
+@property (strong, nonatomic) IBOutlet SDAnimatedImageView *imageView;
+@property (assign) BOOL tintApplied;
 
 @end
 
 @implementation DetailViewController
 
-- (UIActivityIndicatorView *)activityIndicator
-{
-    if (!_activityIndicator) {
-        _activityIndicator = [UIActivityIndicatorView.alloc initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
-        _activityIndicator.center = self.imageView.center;
-        _activityIndicator.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin;
-        [self.imageView addSubview:_activityIndicator];
-        
+- (void)configureView {
+    if (!self.imageView.sd_imageIndicator) {
+        self.imageView.sd_imageIndicator = SDWebImageProgressIndicator.defaultIndicator;
     }
-    return _activityIndicator;
-}
-
-- (UIProgressView *)progressView
-{
-    if (!_progressView) {
-        _progressView = [[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleDefault];
-        [self.view addSubview:_progressView];
+    BOOL isHDR = [self.imageURL.absoluteString containsString:@"HDR"];
+    if (@available(iOS 17.0, *)) {
+        self.imageView.preferredImageDynamicRange = isHDR ? UIImageDynamicRangeHigh : UIImageDynamicRangeUnspecified;
     }
-    return _progressView;
-}
-
-- (void)configureView
-{
-    self.activityIndicator.hidden = NO;
-    [self.activityIndicator startAnimating];
-    
-    __weak typeof(self) weakSelf = self;
+    SDWebImageContext *context = @{
+        SDWebImageContextImageDecodeToHDR: @(isHDR)
+    };
     [self.imageView sd_setImageWithURL:self.imageURL
                       placeholderImage:nil
-                               options:SDWebImageProgressiveDownload
-                              progress:^(NSInteger receivedSize, NSInteger expectedSize, NSURL *targetURL) {
-                                  dispatch_async(dispatch_get_main_queue(), ^{
-                                      float progress = 0;
-                                      if (expectedSize != 0) {
-                                          progress = (float)receivedSize / (float)expectedSize;
-                                      }
-                                      weakSelf.progressView.hidden = NO;
-                                      [weakSelf.progressView setProgress:progress animated:YES];
-                                  });
-                              }
-                             completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
-                                 weakSelf.progressView.hidden = YES;
-                                 [weakSelf.activityIndicator stopAnimating];
-                                 weakSelf.activityIndicator.hidden = YES;
-                             }];
+                               options:SDWebImageFromLoaderOnly | SDWebImageScaleDownLargeImages | SDWebImageProgressiveLoad
+                               context:context
+                              progress:nil
+                             completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+        NSLog(@"isHighDynamicRange %@", @(image.sd_isHighDynamicRange));
+    }];
+    self.imageView.shouldCustomLoopCount = YES;
+    self.imageView.animationRepeatCount = 0;
 }
 
-- (void)viewDidLoad
-{
+- (void)viewDidLoad {
     [super viewDidLoad];
     [self configureView];
+    self.navigationItem.rightBarButtonItem = [UIBarButtonItem.alloc initWithTitle:@"Toggle Animation"
+                                                                            style:UIBarButtonItemStylePlain
+                                                                           target:self
+                                                                           action:@selector(toggleAnimation:)];
+    // Add a secret title click action to apply tint color
+    UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
+    [button addTarget:self
+               action:@selector(toggleTint:)
+     forControlEvents:UIControlEventTouchUpInside];
+    [button setTitle:@"Tint" forState:UIControlStateNormal];
+    self.navigationItem.titleView = button;
 }
 
-- (void)viewDidLayoutSubviews
-{
-    [super viewDidLayoutSubviews];
-    self.progressView.frame = CGRectMake(0, self.topLayoutGuide.length, CGRectGetWidth(self.view.bounds), 2.0);
+- (void)toggleTint:(UIResponder *)sender {
+    // tint for non-opaque animation
+    if (!self.imageView.isAnimating) {
+        return;
+    }
+    SDAnimatedImage *animatedImage = (SDAnimatedImage *)self.imageView.image;
+    if (animatedImage.sd_imageFormat == SDImageFormatGIF) {
+        // GIF is opaque
+        return;
+    }
+    BOOL containsAlpha = [SDImageCoderHelper CGImageContainsAlpha:animatedImage.CGImage];
+    if (!containsAlpha) {
+        return;
+    }
+    if (self.tintApplied) {
+        self.imageView.animationTransformer = nil;
+    } else {
+        self.imageView.animationTransformer = [SDImageTintTransformer transformerWithColor:UIColor.blackColor];
+    }
+    self.tintApplied = !self.tintApplied;
+    // refresh
+    UIImage *image = self.imageView.image;
+    self.imageView.image = nil;
+    self.imageView.image = image;
 }
 
-- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
-{
-    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
+- (void)toggleAnimation:(UIResponder *)sender {
+    self.imageView.isAnimating ? [self.imageView stopAnimating] : [self.imageView startAnimating];
 }
 
 @end
diff --git a/Examples/SDWebImage Demo/SDWebImage Demo-Info.plist b/Examples/SDWebImage Demo/Info.plist
similarity index 100%
rename from Examples/SDWebImage Demo/SDWebImage Demo-Info.plist
rename to Examples/SDWebImage Demo/Info.plist
diff --git a/Examples/SDWebImage Demo/LaunchScreen.storyboard b/Examples/SDWebImage Demo/LaunchScreen.storyboard
index 66a768191..c4475f53e 100644
--- a/Examples/SDWebImage Demo/LaunchScreen.storyboard	
+++ b/Examples/SDWebImage Demo/LaunchScreen.storyboard	
@@ -1,8 +1,12 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="10117" systemVersion="16C67" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" initialViewController="01J-lp-oVM">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14490.70" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <device id="retina4_7" orientation="portrait">
+        <adaptation id="fullscreen"/>
+    </device>
     <dependencies>
         <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="10085"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14490.49"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <scenes>
         <!--View Controller-->
@@ -14,9 +18,9 @@
                         <viewControllerLayoutGuide type="bottom" id="xb3-aO-Qok"/>
                     </layoutGuides>
                     <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
-                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
-                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                     </view>
                 </viewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
diff --git a/Examples/SDWebImage Demo/MasterViewController.m b/Examples/SDWebImage Demo/MasterViewController.m
index 5e2b37bbc..2f4d5583f 100644
--- a/Examples/SDWebImage Demo/MasterViewController.m	
+++ b/Examples/SDWebImage Demo/MasterViewController.m	
@@ -8,13 +8,12 @@
 
 #import "MasterViewController.h"
 #import "DetailViewController.h"
-#import <SDWebImage/FLAnimatedImageView+WebCache.h>
-#import <SDWebImage/UIView+WebCache.h>
+#import <SDWebImage/SDWebImage.h>
 
 @interface MyCustomTableViewCell : UITableViewCell
 
 @property (nonatomic, strong) UILabel *customTextLabel;
-@property (nonatomic, strong) FLAnimatedImageView *customImageView;
+@property (nonatomic, strong) SDAnimatedImageView *customImageView;
 
 @end
 
@@ -22,7 +21,7 @@ @implementation MyCustomTableViewCell
 
 - (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
     if (self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]) {
-        _customImageView = [[FLAnimatedImageView alloc] initWithFrame:CGRectMake(20.0, 2.0, 60.0, 40.0)];
+        _customImageView = [[SDAnimatedImageView alloc] initWithFrame:CGRectMake(20.0, 2.0, 60.0, 40.0)];
         [self.contentView addSubview:_customImageView];
         _customTextLabel = [[UILabel alloc] initWithFrame:CGRectMake(100.0, 12.0, 200, 20.0)];
         [self.contentView addSubview:_customTextLabel];
@@ -43,11 +42,9 @@ @interface MasterViewController ()
 
 @implementation MasterViewController
 
-- (instancetype)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
-{
+- (instancetype)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
     self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
-    if (self)
-    {
+    if (self) {
         self.title = @"SDWebImage";
         self.navigationItem.rightBarButtonItem = [UIBarButtonItem.alloc initWithTitle:@"Clear Cache"
                                                                                 style:UIBarButtonItemStylePlain
@@ -56,57 +53,52 @@ - (instancetype)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibB
         
         // HTTP NTLM auth example
         // Add your NTLM image url to the array below and replace the credentials
-        [SDWebImageManager sharedManager].imageDownloader.username = @"httpwatch";
-        [SDWebImageManager sharedManager].imageDownloader.password = @"httpwatch01";
+        [SDWebImageDownloader sharedDownloader].config.username = @"httpwatch";
+        [SDWebImageDownloader sharedDownloader].config.password = @"httpwatch01";
+        [[SDWebImageDownloader sharedDownloader] setValue:@"SDWebImage Demo" forHTTPHeaderField:@"AppName"];
+        [SDWebImageDownloader sharedDownloader].config.executionOrder = SDWebImageDownloaderLIFOExecutionOrder;
         
         self.objects = [NSMutableArray arrayWithObjects:
+                    @"https://raw.githubusercontent.com/CloudlessMoon/SuperResources/master/Images/HEIC/TestHDR1.heic",
+                    @"https://raw.githubusercontent.com/CloudlessMoon/SuperResources/master/Images/JPG/TestHDR1.JPG",
+                    @"https://raw.githubusercontent.com/CloudlessMoon/SuperResources/master/Images/JPG/TestHDR2.JPG",
                     @"http://www.httpwatch.com/httpgallery/authentication/authenticatedimage/default.aspx?0.35786508303135633",     // requires HTTP auth, used to demo the NTLM auth
                     @"http://assets.sbnation.com/assets/2512203/dogflops.gif",
                     @"https://raw.githubusercontent.com/liyong03/YLGIFImage/master/YLGIFImageDemo/YLGIFImageDemo/joy.gif",
+                    @"http://apng.onevcat.com/assets/elephant.png",
                     @"http://www.ioncannon.net/wp-content/uploads/2011/06/test2.webp",
                     @"http://www.ioncannon.net/wp-content/uploads/2011/06/test9.webp",
                     @"http://littlesvr.ca/apng/images/SteamEngine.webp",
                     @"http://littlesvr.ca/apng/images/world-cup-2014-42.webp",
                     @"https://isparta.github.io/compare-webp/image/gif_webp/webp/2.webp",
+                    @"https://nokiatech.github.io/heif/content/images/ski_jump_1440x960.heic",
+                    @"https://nokiatech.github.io/heif/content/image_sequences/starfield_animation.heic",
+                    @"https://s2.ax1x.com/2019/11/01/KHYIgJ.gif",
+                    @"https://raw.githubusercontent.com/icons8/flat-color-icons/master/pdf/stack_of_photos.pdf",
                     @"https://nr-platform.s3.amazonaws.com/uploads/platform/published_extension/branding_icon/275/AmazonS3.png",
-                    @"http://via.placeholder.com/200x200.jpg",
+                    @"https://res.cloudinary.com/dwpjzbyux/raw/upload/v1666474070/RawDemo/raw_vebed5.NEF",
+                    @"https://placehold.co/200x200.jpg",
                     nil];
 
-        for (int i=0; i<100; i++) {
-            [self.objects addObject:[NSString stringWithFormat:@"https://s3.amazonaws.com/fast-image-cache/demo-images/FICDDemoImage%03d.jpg", i]];
+        for (int i=1; i<25; i++) {
+            // From http://r0k.us/graphics/kodak/, 768x512 resolution, 24 bit depth PNG
+            [self.objects addObject:[NSString stringWithFormat:@"http://r0k.us/graphics/kodak/kodak/kodim%02d.png", i]];
         }
-
     }
-    [SDWebImageManager.sharedManager.imageDownloader setValue:@"SDWebImage Demo" forHTTPHeaderField:@"AppName"];
-    SDWebImageManager.sharedManager.imageDownloader.executionOrder = SDWebImageDownloaderLIFOExecutionOrder;
     return self;
 }
 
-- (void)flushCache
-{
-    [SDWebImageManager.sharedManager.imageCache clearMemory];
-    [SDWebImageManager.sharedManager.imageCache clearDiskOnCompletion:nil];
-}
-							
-- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
-{
-    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
+- (void)flushCache {
+    [SDWebImageManager.sharedManager.imageCache clearWithCacheType:SDImageCacheTypeAll completion:nil];
 }
 
 #pragma mark - Table View
 
-- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
-{
-    return 1;
-}
-
-- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
-{
+- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
     return self.objects.count;
 }
 
-- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
-{
+- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
     static NSString *CellIdentifier = @"Cell";
     
     static UIImage *placeholderImage = nil;
@@ -118,20 +110,34 @@ - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(N
     if (cell == nil) {
         cell = [[MyCustomTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
         cell.customImageView.sd_imageTransition = SDWebImageTransition.fadeTransition;
+        cell.customImageView.sd_imageIndicator = SDWebImageActivityIndicator.grayIndicator;
     }
-
-    [cell.customImageView sd_setShowActivityIndicatorView:YES];
-    [cell.customImageView sd_setIndicatorStyle:UIActivityIndicatorViewStyleGray];
     
     cell.customTextLabel.text = [NSString stringWithFormat:@"Image #%ld", (long)indexPath.row];
-    [cell.customImageView sd_setImageWithURL:[NSURL URLWithString:self.objects[indexPath.row]]
-                            placeholderImage:placeholderImage
-                                     options:indexPath.row == 0 ? SDWebImageRefreshCached : 0];
+    __weak SDAnimatedImageView *imageView = cell.customImageView;
+    [imageView sd_setImageWithURL:[NSURL URLWithString:self.objects[indexPath.row]]
+                 placeholderImage:placeholderImage
+                          options:0
+                          context:@{SDWebImageContextImageThumbnailPixelSize : @(CGSizeMake(180, 120))}
+                         progress:nil
+                        completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+        SDWebImageCombinedOperation *operation = [imageView sd_imageLoadOperationForKey:imageView.sd_latestOperationKey];
+        SDWebImageDownloadToken *token = operation.loaderOperation;
+        if (@available(iOS 10.0, *)) {
+            NSURLSessionTaskMetrics *metrics = token.metrics;
+            if (metrics) {
+                printf("Metrics: %s download image size: (%d, %d) in (%f) seconds\n", [imageURL.absoluteString cStringUsingEncoding:NSUTF8StringEncoding], (int)image.size.width, (int)image.size.height, metrics.taskInterval.duration);
+            } else {
+                if (cacheType == SDImageCacheTypeDisk) {
+                    printf("Disk: %s cached image size: (%d, %d)\n", [imageURL.absoluteString cStringUsingEncoding:NSUTF8StringEncoding], (int)image.size.width, (int)image.size.height);
+                }
+            }
+        }
+    }];
     return cell;
 }
 
-- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
-{
+- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
     NSString *largeImageURLString = [self.objects[indexPath.row] stringByReplacingOccurrencesOfString:@"small" withString:@"source"];
     NSURL *largeImageURL = [NSURL URLWithString:largeImageURLString];
     DetailViewController *detailViewController = [[DetailViewController alloc] initWithNibName:@"DetailViewController" bundle:nil];
diff --git a/Examples/SDWebImage Demo/SDWebImage Demo-Prefix.pch b/Examples/SDWebImage Demo/SDWebImage Demo-Prefix.pch
deleted file mode 100644
index 909f2de25..000000000
--- a/Examples/SDWebImage Demo/SDWebImage Demo-Prefix.pch	
+++ /dev/null
@@ -1,14 +0,0 @@
-//
-// Prefix header for all source files of the 'SDWebImage Demo' target in the 'SDWebImage Demo' project
-//
-
-#import <Availability.h>
-
-#ifndef __IPHONE_4_0
-#warning "This project uses features only available in iOS SDK 4.0 and later."
-#endif
-
-#ifdef __OBJC__
-    #import <UIKit/UIKit.h>
-    #import <Foundation/Foundation.h>
-#endif
diff --git a/Examples/SDWebImage Demo/en.lproj/DetailViewController.xib b/Examples/SDWebImage Demo/en.lproj/DetailViewController.xib
index c3e3aad56..b7ad11793 100644
--- a/Examples/SDWebImage Demo/en.lproj/DetailViewController.xib	
+++ b/Examples/SDWebImage Demo/en.lproj/DetailViewController.xib	
@@ -1,8 +1,12 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="10117" systemVersion="15E65" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none">
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="13771" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" colorMatched="YES">
+    <device id="retina4_7" orientation="portrait">
+        <adaptation id="fullscreen"/>
+    </device>
     <dependencies>
         <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="10085"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13772"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <objects>
         <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner" customClass="DetailViewController">
@@ -16,12 +20,12 @@
             <rect key="frame" x="0.0" y="0.0" width="320" height="460"/>
             <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
             <subviews>
-                <imageView userInteractionEnabled="NO" contentMode="scaleAspectFit" id="7" customClass="FLAnimatedImageView">
+                <imageView userInteractionEnabled="NO" contentMode="scaleAspectFit" id="7" customClass="SDAnimatedImageView">
                     <rect key="frame" x="0.0" y="0.0" width="320" height="460"/>
                     <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                 </imageView>
             </subviews>
-            <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+            <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
             <freeformSimulatedSizeMetrics key="simulatedDestinationMetrics"/>
         </view>
     </objects>
diff --git a/Examples/SDWebImage OSX Demo/AppDelegate.h b/Examples/SDWebImage OSX Demo/AppDelegate.h
index a9a60529f..99adbba0c 100644
--- a/Examples/SDWebImage OSX Demo/AppDelegate.h	
+++ b/Examples/SDWebImage OSX Demo/AppDelegate.h	
@@ -10,6 +10,7 @@
 
 @interface AppDelegate : NSObject <NSApplicationDelegate>
 
+@property (strong, nonatomic) NSWindowController *windowController;
 
 @end
 
diff --git a/Examples/SDWebImage OSX Demo/AppDelegate.m b/Examples/SDWebImage OSX Demo/AppDelegate.m
index 4ddb742b5..9a7294fa8 100644
--- a/Examples/SDWebImage OSX Demo/AppDelegate.m	
+++ b/Examples/SDWebImage OSX Demo/AppDelegate.m	
@@ -8,6 +8,9 @@
 
 #import "AppDelegate.h"
 
+#import <SDWebImage/SDWebImage.h>
+#import <SDWebImageWebPCoder/SDWebImageWebPCoder.h>
+
 @interface AppDelegate ()
 
 @end
@@ -16,6 +19,23 @@ @implementation AppDelegate
 
 - (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
     // Insert code here to initialize your application
+    if (@available(iOS 14, tvOS 14, macOS 11, watchOS 7, *)) {
+        // iOS 14 supports WebP built-in
+        [[SDImageCodersManager sharedManager] addCoder:[SDImageAWebPCoder sharedCoder]];
+    } else {
+        // iOS 13 does not supports WebP, use third-party codec
+        [[SDImageCodersManager sharedManager] addCoder:[SDImageWebPCoder sharedCoder]];
+    }
+    if (@available(iOS 13, tvOS 13, macOS 10.15, watchOS 6, *)) {
+        // For HEIC animated image. Animated image is new introduced in iOS 13, but it contains performance issue for now.
+        [[SDImageCodersManager sharedManager] addCoder:[SDImageHEICCoder sharedCoder]];
+    }
+    
+    NSStoryboard *mainStoryboard = [NSStoryboard storyboardWithName:@"Main" bundle:nil];
+    NSWindowController *initialController = [mainStoryboard instantiateControllerWithIdentifier:@"MainWindowController"];
+    self.windowController = initialController;
+    [initialController showWindow:self];
+    [initialController.window makeKeyAndOrderFront:self];
 }
 
 - (void)applicationWillTerminate:(NSNotification *)aNotification {
diff --git a/Examples/SDWebImage OSX Demo/Base.lproj/Main.storyboard b/Examples/SDWebImage OSX Demo/Base.lproj/Main.storyboard
index eaa4ae596..558cd482b 100644
--- a/Examples/SDWebImage OSX Demo/Base.lproj/Main.storyboard	
+++ b/Examples/SDWebImage OSX Demo/Base.lproj/Main.storyboard	
@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.Cocoa.Storyboard.XIB" version="3.0" toolsVersion="13771" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" initialViewController="B8D-0N-5wS">
+<document type="com.apple.InterfaceBuilder3.Cocoa.Storyboard.XIB" version="3.0" toolsVersion="23094" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES">
     <dependencies>
         <deployment identifier="macosx"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="13771"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="23094"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <scenes>
@@ -651,8 +651,8 @@
         <!--Window Controller-->
         <scene sceneID="R2V-B0-nI4">
             <objects>
-                <windowController id="B8D-0N-5wS" sceneMemberID="viewController">
-                    <window key="window" title="Window" allowsToolTipsWhenApplicationIsInactive="NO" autorecalculatesKeyViewLoop="NO" oneShot="NO" releasedWhenClosed="NO" showsToolbarButton="NO" visibleAtLaunch="NO" animationBehavior="default" id="IQv-IB-iLA">
+                <windowController storyboardIdentifier="MainWindowController" id="B8D-0N-5wS" customClass="WindowController" sceneMemberID="viewController">
+                    <window key="window" title="Window" allowsToolTipsWhenApplicationIsInactive="NO" autorecalculatesKeyViewLoop="NO" releasedWhenClosed="NO" visibleAtLaunch="NO" animationBehavior="default" id="IQv-IB-iLA">
                         <windowStyleMask key="styleMask" titled="YES" closable="YES" miniaturizable="YES" resizable="YES"/>
                         <windowPositionMask key="initialPositionMask" leftStrut="YES" rightStrut="YES" topStrut="YES" bottomStrut="YES"/>
                         <rect key="contentRect" x="196" y="240" width="480" height="400"/>
@@ -677,42 +677,24 @@
                         <rect key="frame" x="0.0" y="0.0" width="480" height="400"/>
                         <autoresizingMask key="autoresizingMask"/>
                         <subviews>
-                            <imageView horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="nbD-Cx-g7b">
-                                <rect key="frame" x="20" y="252" width="204" height="128"/>
-                                <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
-                                <imageCell key="cell" refusesFirstResponder="YES" alignment="left" imageScaling="proportionallyDown" id="vAn-1d-apO"/>
-                            </imageView>
-                            <imageView horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="kv0-67-hkh">
-                                <rect key="frame" x="256" y="252" width="204" height="128"/>
-                                <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
-                                <imageCell key="cell" refusesFirstResponder="YES" alignment="left" imageScaling="proportionallyDown" id="f0P-c9-GMe"/>
-                            </imageView>
-                            <imageView horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="JIp-Or-vBM">
-                                <rect key="frame" x="20" y="116" width="204" height="128"/>
-                                <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
-                                <imageCell key="cell" refusesFirstResponder="YES" alignment="left" imageScaling="proportionallyDown" id="NJq-m3-LlB"/>
-                            </imageView>
-                            <imageView horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="khI-tY-l0M">
-                                <rect key="frame" x="256" y="116" width="204" height="128"/>
-                                <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
-                                <imageCell key="cell" refusesFirstResponder="YES" alignment="left" imageScaling="proportionallyDown" id="WbV-Do-9qy"/>
-                            </imageView>
-                            <button fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="NqE-Zi-qhY">
-                                <rect key="frame" x="212" y="17" width="56" height="31"/>
-                                <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
+                            <button translatesAutoresizingMaskIntoConstraints="NO" id="NqE-Zi-qhY">
+                                <rect key="frame" x="211" y="16" width="58" height="33"/>
                                 <buttonCell key="cell" type="bevel" title="Clear" bezelStyle="regularSquare" alignment="center" borderStyle="border" imageScaling="proportionallyUpOrDown" inset="2" id="OYN-fG-Plb">
                                     <behavior key="behavior" pushIn="YES" changeContents="YES" lightByContents="YES"/>
                                     <font key="font" metaFont="system"/>
                                 </buttonCell>
+                                <constraints>
+                                    <constraint firstAttribute="height" constant="26" id="WoQ-RY-bSV"/>
+                                </constraints>
                             </button>
                         </subviews>
+                        <constraints>
+                            <constraint firstItem="NqE-Zi-qhY" firstAttribute="centerX" secondItem="m2S-Jp-Qdl" secondAttribute="centerX" id="DYu-70-sO9"/>
+                            <constraint firstAttribute="bottom" secondItem="NqE-Zi-qhY" secondAttribute="bottom" constant="20" id="I0D-EI-mL0"/>
+                        </constraints>
                     </view>
                     <connections>
                         <outlet property="clearCacheButton" destination="NqE-Zi-qhY" id="eoz-cU-wWs"/>
-                        <outlet property="imageView1" destination="nbD-Cx-g7b" id="t2R-8w-ybH"/>
-                        <outlet property="imageView2" destination="kv0-67-hkh" id="i4k-5c-bno"/>
-                        <outlet property="imageView3" destination="JIp-Or-vBM" id="Qcf-og-59T"/>
-                        <outlet property="imageView4" destination="khI-tY-l0M" id="STy-c1-ihV"/>
                     </connections>
                 </viewController>
                 <customObject id="rPt-NT-nkU" userLabel="First Responder" customClass="NSResponder" sceneMemberID="firstResponder"/>
diff --git a/Examples/SDWebImage OSX Demo/ViewController.m b/Examples/SDWebImage OSX Demo/ViewController.m
index c746d4c54..5a018c3d2 100644
--- a/Examples/SDWebImage OSX Demo/ViewController.m	
+++ b/Examples/SDWebImage OSX Demo/ViewController.m	
@@ -7,15 +7,19 @@
  */
 
 #import "ViewController.h"
-
-@import SDWebImage;
+#import <SDWebImage/SDWebImage.h>
 
 @interface ViewController ()
 
-@property (weak) IBOutlet NSImageView *imageView1;
-@property (weak) IBOutlet NSImageView *imageView2;
-@property (weak) IBOutlet NSImageView *imageView3;
-@property (weak) IBOutlet NSImageView *imageView4;
+@property (strong) NSImageView *imageView1;
+@property (strong) SDAnimatedImageView *imageView2;
+
+@property (strong) NSImageView *imageView3;
+@property (strong) SDAnimatedImageView *imageView4;
+
+@property (strong) NSImageView *imageView5;
+@property (strong) NSImageView *imageView6;
+
 @property (weak) IBOutlet NSButton *clearCacheButton;
 
 @end
@@ -24,22 +28,58 @@ @implementation ViewController
 
 - (void)viewDidLoad {
     [super viewDidLoad];
+    self.imageView1 = [NSImageView new];
+    self.imageView2 = [SDAnimatedImageView new];
+    self.imageView3 = [NSImageView new];
+    self.imageView4 = [SDAnimatedImageView new];
+    self.imageView5 = [NSImageView new];
+    self.imageView6 = [NSImageView new];
     
-    //Add GIF coder for better animated image rendering
-    [[SDWebImageCodersManager sharedInstance] addCoder:[SDWebImageGIFCoder sharedCoder]];
+    [self.view addSubview:self.imageView1];
+    [self.view addSubview:self.imageView2];
+    [self.view addSubview:self.imageView3];
+    [self.view addSubview:self.imageView4];
+    [self.view addSubview:self.imageView5];
+    [self.view addSubview:self.imageView6];
     
-    // NOTE: https links or authentication ones do not work (there is a crash)
-    
-//     Do any additional setup after loading the view.
     // For animated GIF rendering, set `animates` to YES or will only show the first frame
-    self.imageView1.animates = YES;
-    self.imageView3.animates = YES;
-    [self.imageView1 sd_setImageWithURL:[NSURL URLWithString:@"http://assets.sbnation.com/assets/2512203/dogflops.gif"]];
-    [self.imageView2 sd_setImageWithURL:[NSURL URLWithString:@"http://www.ioncannon.net/wp-content/uploads/2011/06/test2.webp"]];
-    [self.imageView3 sd_setImageWithURL:[NSURL URLWithString:@"http://littlesvr.ca/apng/images/SteamEngine.webp"]];
-    self.imageView4.wantsLayer = YES;
+    self.imageView3.animates = YES; // `SDAnimatedImageRep` can be used for built-in `NSImageView` to support better GIF & APNG rendering as well. No need `SDAnimatedImageView`
+    self.imageView4.animates = YES;
+    
+#pragma mark - Static Image
+    // NSImageView + Static Image
+    self.imageView1.sd_imageIndicator = SDWebImageProgressIndicator.defaultIndicator;
+    [self.imageView1 sd_setImageWithURL:[NSURL URLWithString:@"https://raw.githubusercontent.com/recurser/exif-orientation-examples/master/Landscape_2.jpg"] placeholderImage:nil options:SDWebImageProgressiveLoad];
+    // SDAnimatedImageView + Static Image
+    [self.imageView2 sd_setImageWithURL:[NSURL URLWithString:@"https://nr-platform.s3.amazonaws.com/uploads/platform/published_extension/branding_icon/275/AmazonS3.png"]];
+    
+#pragma mark - Animated Image
+    // NSImageView + Animated Image
+    self.imageView3.sd_imageIndicator = SDWebImageActivityIndicator.largeIndicator;
+    [self.imageView3 sd_setImageWithURL:[NSURL URLWithString:@"https://raw.githubusercontent.com/onevcat/APNGKit/2.2.0/Tests/APNGKitTests/Resources/General/APNG-cube.apng"]];
+    NSMenu *menu1 = [[NSMenu alloc] initWithTitle:@"Toggle Animation"];
+    NSMenuItem *item1 = [menu1 addItemWithTitle:@"Toggle Animation" action:@selector(toggleAnimation:) keyEquivalent:@""];
+    item1.tag = 1;
+    self.imageView3.menu = menu1;
+    // SDAnimatedImageView + Animated Image
     self.imageView4.sd_imageTransition = SDWebImageTransition.fadeTransition;
-    [self.imageView4 sd_setImageWithURL:[NSURL URLWithString:@"http://s3.amazonaws.com/fast-image-cache/demo-images/FICDDemoImage001.jpg"] placeholderImage:nil options:SDWebImageForceTransition];
+    self.imageView4.imageScaling = NSImageScaleProportionallyUpOrDown;
+    self.imageView4.imageAlignment = NSImageAlignLeft; // supports NSImageView's layout properties
+    [self.imageView4 sd_setImageWithURL:[NSURL URLWithString:@"http://littlesvr.ca/apng/images/SteamEngine.webp"]];
+    NSMenu *menu2 = [[NSMenu alloc] initWithTitle:@"Toggle Animation"];
+    NSMenuItem *item2 = [menu2 addItemWithTitle:@"Toggle Animation" action:@selector(toggleAnimation:) keyEquivalent:@""];
+    item2.tag = 2;
+    self.imageView4.menu = menu2;
+    
+#pragma mark - HDR Image
+    // HDR Image
+    if (@available(macOS 14.0, *)) {
+        self.imageView5.preferredImageDynamicRange = NSImageDynamicRangeHigh;
+        self.imageView6.preferredImageDynamicRange = NSImageDynamicRangeHigh;
+    }
+    [self.imageView5 sd_setImageWithURL:[NSURL URLWithString:@"https://lightroom.adobe.com/v2c/spaces/113ab046f0d04b40aa7f8e10285961a7/assets/cd191116be514e1288ca6ea372303139/revisions/2749aff3294e404c9ffce3518e467d4a/renditions/99673919d096b42650b448f6516089cc.avif"] placeholderImage:nil options:0 context:@{SDWebImageContextImageDecodeToHDR : @(YES)}];
+    // SDR Image
+    [self.imageView6 sd_setImageWithURL:[NSURL URLWithString:@"https://lightroom.adobe.com/v2c/spaces/113ab046f0d04b40aa7f8e10285961a7/assets/cd191116be514e1288ca6ea372303139/revisions/2749aff3294e404c9ffce3518e467d4a/renditions/99673919d096b42650b448f6516089cc"] placeholderImage:nil options:0 context:@{SDWebImageContextImageDecodeToHDR : @(NO)}];
     
     self.clearCacheButton.target = self;
     self.clearCacheButton.action = @selector(clearCacheButtonClicked:);
@@ -47,6 +87,20 @@ - (void)viewDidLoad {
     [self.clearCacheButton sd_setAlternateImageWithURL:[NSURL URLWithString:@"https://png.icons8.com/color/100/000000/checkmark.png"]];
 }
 
+- (void)viewDidLayout {
+    [super viewDidLayout];
+    CGFloat space = 20;
+    CGFloat imageWidth = (self.view.frame.size.width - space * 4) / 3;
+    CGFloat imageHeight = (self.view.frame.size.height - space * 3) / 2;
+    
+    self.imageView1.frame = CGRectMake(space * 1 + imageWidth * 0, space, imageWidth, imageHeight);
+    self.imageView2.frame = CGRectMake(self.imageView1.frame.origin.x, self.imageView1.frame.origin.y + imageHeight + space, imageWidth, imageHeight);
+    self.imageView3.frame = CGRectMake(space * 2 + imageWidth * 1, space, imageWidth, imageHeight);
+    self.imageView4.frame = CGRectMake(self.imageView3.frame.origin.x, self.imageView3.frame.origin.y + imageHeight + space, imageWidth, imageHeight);
+    self.imageView5.frame = CGRectMake(space * 3 + imageWidth * 2, space, imageWidth, imageHeight);
+    self.imageView6.frame = CGRectMake(self.imageView5.frame.origin.x, self.imageView5.frame.origin.y + imageHeight + space, imageWidth, imageHeight);
+}
+
 - (void)clearCacheButtonClicked:(NSResponder *)sender {
     NSButton *button = (NSButton *)sender;
     button.state = NSControlStateValueOn;
@@ -56,6 +110,15 @@ - (void)clearCacheButtonClicked:(NSResponder *)sender {
     }];
 }
 
+- (void)toggleAnimation:(NSMenuItem *)sender {
+    NSImageView *imageView = sender.tag == 1 ? self.imageView3 : self.imageView4;
+    if (imageView.animates) {
+        imageView.animates = NO;
+    } else {
+        imageView.animates = YES;
+    }
+}
+
 - (void)setRepresentedObject:(id)representedObject {
     [super setRepresentedObject:representedObject];
 
diff --git a/SDWebImage/NSImage+WebCache.h b/Examples/SDWebImage OSX Demo/WindowController.h
similarity index 63%
rename from SDWebImage/NSImage+WebCache.h
rename to Examples/SDWebImage OSX Demo/WindowController.h
index 7515d4074..86e69bb95 100644
--- a/SDWebImage/NSImage+WebCache.h
+++ b/Examples/SDWebImage OSX Demo/WindowController.h	
@@ -6,18 +6,12 @@
  * file that was distributed with this source code.
  */
 
-#import "SDWebImageCompat.h"
-
-#if SD_MAC
-
 #import <Cocoa/Cocoa.h>
 
-@interface NSImage (WebCache)
+NS_ASSUME_NONNULL_BEGIN
 
-- (CGImageRef)CGImage;
-- (NSArray<NSImage *> *)images;
-- (BOOL)isGIF;
+@interface WindowController : NSWindowController
 
 @end
 
-#endif
+NS_ASSUME_NONNULL_END
diff --git a/SDWebImage/SDWebImageOperation.h b/Examples/SDWebImage OSX Demo/WindowController.m
similarity index 72%
rename from SDWebImage/SDWebImageOperation.h
rename to Examples/SDWebImage OSX Demo/WindowController.m
index 71094ee36..51c9b8529 100644
--- a/SDWebImage/SDWebImageOperation.h
+++ b/Examples/SDWebImage OSX Demo/WindowController.m	
@@ -6,10 +6,8 @@
  * file that was distributed with this source code.
  */
 
-#import <Foundation/Foundation.h>
+#import "WindowController.h"
 
-@protocol SDWebImageOperation <NSObject>
-
-- (void)cancel;
+@implementation WindowController
 
 @end
diff --git a/Examples/SDWebImage TV Demo/AppDelegate.m b/Examples/SDWebImage TV Demo/AppDelegate.m
index 1d02f83a2..f14575ede 100644
--- a/Examples/SDWebImage TV Demo/AppDelegate.m	
+++ b/Examples/SDWebImage TV Demo/AppDelegate.m	
@@ -8,6 +8,9 @@
 
 #import "AppDelegate.h"
 
+#import <SDWebImage/SDWebImage.h>
+#import <SDWebImageWebPCoder/SDWebImageWebPCoder.h>
+
 @interface AppDelegate ()
 
 @end
@@ -17,6 +20,18 @@ @implementation AppDelegate
 
 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
     // Override point for customization after application launch.
+    if (@available(iOS 14, tvOS 14, macOS 11, watchOS 7, *)) {
+        // iOS 14 supports WebP built-in
+        [[SDImageCodersManager sharedManager] addCoder:[SDImageAWebPCoder sharedCoder]];
+    } else {
+        // iOS 13 does not supports WebP, use third-party codec
+        [[SDImageCodersManager sharedManager] addCoder:[SDImageWebPCoder sharedCoder]];
+    }
+    if (@available(iOS 13, tvOS 13, macOS 10.15, watchOS 6, *)) {
+        // For HEIC animated image. Animated image is new introduced in iOS 13, but it contains performance issue for now.
+        [[SDImageCodersManager sharedManager] addCoder:[SDImageHEICCoder sharedCoder]];
+    }
+    
     return YES;
 }
 
diff --git a/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/App Icon - Large.imagestack/Back.imagestacklayer/Content.imageset/Contents.json b/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/App Icon - Large.imagestack/Back.imagestacklayer/Content.imageset/Contents.json
index 0564959fb..16a370df0 100644
--- a/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/App Icon - Large.imagestack/Back.imagestacklayer/Content.imageset/Contents.json	
+++ b/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/App Icon - Large.imagestack/Back.imagestacklayer/Content.imageset/Contents.json	
@@ -3,6 +3,10 @@
     {
       "idiom" : "tv",
       "scale" : "1x"
+    },
+    {
+      "idiom" : "tv",
+      "scale" : "2x"
     }
   ],
   "info" : {
diff --git a/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/App Icon - Large.imagestack/Front.imagestacklayer/Content.imageset/Contents.json b/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/App Icon - Large.imagestack/Front.imagestacklayer/Content.imageset/Contents.json
index 0564959fb..16a370df0 100644
--- a/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/App Icon - Large.imagestack/Front.imagestacklayer/Content.imageset/Contents.json	
+++ b/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/App Icon - Large.imagestack/Front.imagestacklayer/Content.imageset/Contents.json	
@@ -3,6 +3,10 @@
     {
       "idiom" : "tv",
       "scale" : "1x"
+    },
+    {
+      "idiom" : "tv",
+      "scale" : "2x"
     }
   ],
   "info" : {
diff --git a/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/App Icon - Large.imagestack/Middle.imagestacklayer/Content.imageset/Contents.json b/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/App Icon - Large.imagestack/Middle.imagestacklayer/Content.imageset/Contents.json
index 0564959fb..16a370df0 100644
--- a/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/App Icon - Large.imagestack/Middle.imagestacklayer/Content.imageset/Contents.json	
+++ b/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/App Icon - Large.imagestack/Middle.imagestacklayer/Content.imageset/Contents.json	
@@ -3,6 +3,10 @@
     {
       "idiom" : "tv",
       "scale" : "1x"
+    },
+    {
+      "idiom" : "tv",
+      "scale" : "2x"
     }
   ],
   "info" : {
diff --git a/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/App Icon - Small.imagestack/Back.imagestacklayer/Content.imageset/Contents.json b/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/App Icon - Small.imagestack/Back.imagestacklayer/Content.imageset/Contents.json
index 0564959fb..16a370df0 100644
--- a/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/App Icon - Small.imagestack/Back.imagestacklayer/Content.imageset/Contents.json	
+++ b/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/App Icon - Small.imagestack/Back.imagestacklayer/Content.imageset/Contents.json	
@@ -3,6 +3,10 @@
     {
       "idiom" : "tv",
       "scale" : "1x"
+    },
+    {
+      "idiom" : "tv",
+      "scale" : "2x"
     }
   ],
   "info" : {
diff --git a/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/App Icon - Small.imagestack/Front.imagestacklayer/Content.imageset/Contents.json b/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/App Icon - Small.imagestack/Front.imagestacklayer/Content.imageset/Contents.json
index 0564959fb..16a370df0 100644
--- a/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/App Icon - Small.imagestack/Front.imagestacklayer/Content.imageset/Contents.json	
+++ b/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/App Icon - Small.imagestack/Front.imagestacklayer/Content.imageset/Contents.json	
@@ -3,6 +3,10 @@
     {
       "idiom" : "tv",
       "scale" : "1x"
+    },
+    {
+      "idiom" : "tv",
+      "scale" : "2x"
     }
   ],
   "info" : {
diff --git a/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/App Icon - Small.imagestack/Middle.imagestacklayer/Content.imageset/Contents.json b/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/App Icon - Small.imagestack/Middle.imagestacklayer/Content.imageset/Contents.json
index 0564959fb..16a370df0 100644
--- a/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/App Icon - Small.imagestack/Middle.imagestacklayer/Content.imageset/Contents.json	
+++ b/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/App Icon - Small.imagestack/Middle.imagestacklayer/Content.imageset/Contents.json	
@@ -3,6 +3,10 @@
     {
       "idiom" : "tv",
       "scale" : "1x"
+    },
+    {
+      "idiom" : "tv",
+      "scale" : "2x"
     }
   ],
   "info" : {
diff --git a/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/Contents.json b/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/Contents.json
index 6a3dcfa52..dea6e49fd 100644
--- a/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/Contents.json	
+++ b/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/Contents.json	
@@ -12,6 +12,12 @@
       "filename" : "App Icon - Small.imagestack",
       "role" : "primary-app-icon"
     },
+    {
+      "size" : "2320x720",
+      "idiom" : "tv",
+      "filename" : "Top Shelf Image Wide.imageset",
+      "role" : "top-shelf-image-wide"
+    },
     {
       "size" : "1920x720",
       "idiom" : "tv",
@@ -23,4 +29,4 @@
     "version" : 1,
     "author" : "xcode"
   }
-}
+}
\ No newline at end of file
diff --git a/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/Top Shelf Image Wide.imageset/Contents.json b/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/Top Shelf Image Wide.imageset/Contents.json
new file mode 100644
index 000000000..16a370df0
--- /dev/null
+++ b/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/Top Shelf Image Wide.imageset/Contents.json	
@@ -0,0 +1,16 @@
+{
+  "images" : [
+    {
+      "idiom" : "tv",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "tv",
+      "scale" : "2x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}
\ No newline at end of file
diff --git a/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/Top Shelf Image.imageset/Contents.json b/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/Top Shelf Image.imageset/Contents.json
index 0564959fb..16a370df0 100644
--- a/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/Top Shelf Image.imageset/Contents.json	
+++ b/Examples/SDWebImage TV Demo/Assets.xcassets/App Icon & Top Shelf Image.brandassets/Top Shelf Image.imageset/Contents.json	
@@ -3,6 +3,10 @@
     {
       "idiom" : "tv",
       "scale" : "1x"
+    },
+    {
+      "idiom" : "tv",
+      "scale" : "2x"
     }
   ],
   "info" : {
diff --git a/Examples/SDWebImage TV Demo/Assets.xcassets/LaunchImage.launchimage/Contents.json b/Examples/SDWebImage TV Demo/Assets.xcassets/LaunchImage.launchimage/Contents.json
index 29d94c787..d746a6090 100644
--- a/Examples/SDWebImage TV Demo/Assets.xcassets/LaunchImage.launchimage/Contents.json	
+++ b/Examples/SDWebImage TV Demo/Assets.xcassets/LaunchImage.launchimage/Contents.json	
@@ -1,5 +1,12 @@
 {
   "images" : [
+    {
+      "orientation" : "landscape",
+      "idiom" : "tv",
+      "extent" : "full-screen",
+      "minimum-system-version" : "11.0",
+      "scale" : "2x"
+    },
     {
       "orientation" : "landscape",
       "idiom" : "tv",
diff --git a/Examples/SDWebImage TV Demo/Base.lproj/Main.storyboard b/Examples/SDWebImage TV Demo/Base.lproj/Main.storyboard
index 91f4335d0..5b9d768dd 100644
--- a/Examples/SDWebImage TV Demo/Base.lproj/Main.storyboard	
+++ b/Examples/SDWebImage TV Demo/Base.lproj/Main.storyboard	
@@ -1,7 +1,12 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder.AppleTV.Storyboard" version="3.0" toolsVersion="10117" systemVersion="15F34" targetRuntime="AppleTV" propertyAccessControl="none" useAutolayout="YES" initialViewController="BYZ-38-t0r">
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder.AppleTV.Storyboard" version="3.0" toolsVersion="14490.70" targetRuntime="AppleTV" propertyAccessControl="none" useAutolayout="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
+    <device id="appleTV" orientation="landscape">
+        <adaptation id="light"/>
+    </device>
     <dependencies>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="10085"/>
+        <deployment identifier="tvOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14490.49"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <scenes>
         <!--View Controller-->
@@ -16,20 +21,24 @@
                         <rect key="frame" x="0.0" y="0.0" width="1920" height="1080"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
-                            <imageView userInteractionEnabled="NO" contentMode="scaleToFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="xeq-iS-C6S" customClass="FLAnimatedImageView">
+                            <imageView userInteractionEnabled="NO" contentMode="scaleToFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="xeq-iS-C6S">
                                 <rect key="frame" x="20" y="20" width="300" height="200"/>
+                                <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                             </imageView>
-                            <imageView userInteractionEnabled="NO" contentMode="scaleToFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="c5h-Lg-aZx" customClass="FLAnimatedImageView">
+                            <imageView userInteractionEnabled="NO" contentMode="scaleToFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="xvm-ne-7D9">
+                                <rect key="frame" x="328" y="20" width="300" height="200"/>
+                                <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+                            </imageView>
+                            <imageView userInteractionEnabled="NO" contentMode="scaleToFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="c5h-Lg-aZx" customClass="SDAnimatedImageView">
                                 <rect key="frame" x="636" y="20" width="300" height="200"/>
+                                <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                             </imageView>
-                            <imageView userInteractionEnabled="NO" contentMode="scaleToFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="Udx-nH-mbX" customClass="FLAnimatedImageView">
+                            <imageView userInteractionEnabled="NO" contentMode="scaleToFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="Udx-nH-mbX" customClass="SDAnimatedImageView">
                                 <rect key="frame" x="944" y="20" width="300" height="200"/>
-                            </imageView>
-                            <imageView userInteractionEnabled="NO" contentMode="scaleToFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="xvm-ne-7D9" customClass="FLAnimatedImageView">
-                                <rect key="frame" x="328" y="20" width="300" height="200"/>
+                                <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                             </imageView>
                         </subviews>
-                        <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="custom" customColorSpace="calibratedWhite"/>
+                        <color key="backgroundColor" red="0.0" green="0.0" blue="0.0" alpha="0.0" colorSpace="custom" customColorSpace="sRGB"/>
                     </view>
                     <connections>
                         <outlet property="imageView1" destination="xeq-iS-C6S" id="4gp-UN-VjW"/>
diff --git a/Examples/SDWebImage TV Demo/ViewController.m b/Examples/SDWebImage TV Demo/ViewController.m
index 2fb918e57..ff23b5330 100644
--- a/Examples/SDWebImage TV Demo/ViewController.m	
+++ b/Examples/SDWebImage TV Demo/ViewController.m	
@@ -7,14 +7,14 @@
  */
 
 #import "ViewController.h"
-#import <SDWebImage/FLAnimatedImageView+WebCache.h>
+#import <SDWebImage/SDWebImage.h>
 
 @interface ViewController ()
 
-@property (weak, nonatomic) IBOutlet FLAnimatedImageView *imageView1;
-@property (weak, nonatomic) IBOutlet FLAnimatedImageView *imageView2;
-@property (weak, nonatomic) IBOutlet FLAnimatedImageView *imageView3;
-@property (weak, nonatomic) IBOutlet FLAnimatedImageView *imageView4;
+@property (weak, nonatomic) IBOutlet UIImageView *imageView1;
+@property (weak, nonatomic) IBOutlet UIImageView *imageView2;
+@property (weak, nonatomic) IBOutlet SDAnimatedImageView *imageView3;
+@property (weak, nonatomic) IBOutlet SDAnimatedImageView *imageView4;
 
 @end
 
@@ -25,10 +25,10 @@ - (void)viewDidLoad {
     [super viewDidLoad];
     // Do any additional setup after loading the view, typically from a nib.
     
-    [self.imageView1 sd_setImageWithURL:[NSURL URLWithString:@"http://assets.sbnation.com/assets/2512203/dogflops.gif"]];
+    [self.imageView1 sd_setImageWithURL:[NSURL URLWithString:@"https://nokiatech.github.io/heif/content/images/ski_jump_1440x960.heic"]];
     [self.imageView2 sd_setImageWithURL:[NSURL URLWithString:@"http://www.ioncannon.net/wp-content/uploads/2011/06/test2.webp"]];
-    [self.imageView3 sd_setImageWithURL:[NSURL URLWithString:@"http://s3.amazonaws.com/fast-image-cache/demo-images/FICDDemoImage000.jpg"]];
-    [self.imageView4 sd_setImageWithURL:[NSURL URLWithString:@"http://s3.amazonaws.com/fast-image-cache/demo-images/FICDDemoImage001.jpg"]];
+    [self.imageView3 sd_setImageWithURL:[NSURL URLWithString:@"https://raw.githubusercontent.com/liyong03/YLGIFImage/master/YLGIFImageDemo/YLGIFImageDemo/joy.gif"]];
+    [self.imageView4 sd_setImageWithURL:[NSURL URLWithString:@"http://littlesvr.ca/apng/images/SteamEngine.webp"]];
 }
 
 - (void)didReceiveMemoryWarning {
diff --git a/Examples/SDWebImage Vision Demo/App.swift b/Examples/SDWebImage Vision Demo/App.swift
new file mode 100644
index 000000000..adee94b79
--- /dev/null
+++ b/Examples/SDWebImage Vision Demo/App.swift	
@@ -0,0 +1,30 @@
+/*
+* This file is part of the SDWebImage package.
+* (c) DreamPiggy <lizhuoli1126@126.com>
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code.
+*/
+
+import SwiftUI
+import SDWebImage
+
+class AppDelegate: NSObject, UIApplicationDelegate {
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
+        // Insert code here to initialize your application
+        SDImageCodersManager.shared.addCoder(SDImageAWebPCoder.shared)
+        SDImageCodersManager.shared.addCoder(SDImageHEICCoder.shared)
+        return true
+    }
+}
+
+@main
+struct SDWebImage_Vision_DemoApp: App {
+    @UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
+    
+    var body: some Scene {
+        WindowGroup {
+            ContentView()
+        }
+    }
+}
diff --git a/Examples/SDWebImage Vision Demo/Assets.xcassets/AppIcon.solidimagestack/Back.solidimagestacklayer/Content.imageset/Contents.json b/Examples/SDWebImage Vision Demo/Assets.xcassets/AppIcon.solidimagestack/Back.solidimagestacklayer/Content.imageset/Contents.json
new file mode 100644
index 000000000..04056a547
--- /dev/null
+++ b/Examples/SDWebImage Vision Demo/Assets.xcassets/AppIcon.solidimagestack/Back.solidimagestacklayer/Content.imageset/Contents.json	
@@ -0,0 +1,12 @@
+{
+  "images" : [
+    {
+      "idiom" : "vision",
+      "scale" : "2x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}
diff --git a/Examples/SDWebImage Vision Demo/Assets.xcassets/AppIcon.solidimagestack/Back.solidimagestacklayer/Contents.json b/Examples/SDWebImage Vision Demo/Assets.xcassets/AppIcon.solidimagestack/Back.solidimagestacklayer/Contents.json
new file mode 100644
index 000000000..73c00596a
--- /dev/null
+++ b/Examples/SDWebImage Vision Demo/Assets.xcassets/AppIcon.solidimagestack/Back.solidimagestacklayer/Contents.json	
@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}
diff --git a/Examples/SDWebImage Vision Demo/Assets.xcassets/AppIcon.solidimagestack/Contents.json b/Examples/SDWebImage Vision Demo/Assets.xcassets/AppIcon.solidimagestack/Contents.json
new file mode 100644
index 000000000..950af4d85
--- /dev/null
+++ b/Examples/SDWebImage Vision Demo/Assets.xcassets/AppIcon.solidimagestack/Contents.json	
@@ -0,0 +1,17 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  },
+  "layers" : [
+    {
+      "filename" : "Front.solidimagestacklayer"
+    },
+    {
+      "filename" : "Middle.solidimagestacklayer"
+    },
+    {
+      "filename" : "Back.solidimagestacklayer"
+    }
+  ]
+}
diff --git a/Examples/SDWebImage Vision Demo/Assets.xcassets/AppIcon.solidimagestack/Front.solidimagestacklayer/Content.imageset/Contents.json b/Examples/SDWebImage Vision Demo/Assets.xcassets/AppIcon.solidimagestack/Front.solidimagestacklayer/Content.imageset/Contents.json
new file mode 100644
index 000000000..04056a547
--- /dev/null
+++ b/Examples/SDWebImage Vision Demo/Assets.xcassets/AppIcon.solidimagestack/Front.solidimagestacklayer/Content.imageset/Contents.json	
@@ -0,0 +1,12 @@
+{
+  "images" : [
+    {
+      "idiom" : "vision",
+      "scale" : "2x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}
diff --git a/Examples/SDWebImage Vision Demo/Assets.xcassets/AppIcon.solidimagestack/Front.solidimagestacklayer/Contents.json b/Examples/SDWebImage Vision Demo/Assets.xcassets/AppIcon.solidimagestack/Front.solidimagestacklayer/Contents.json
new file mode 100644
index 000000000..73c00596a
--- /dev/null
+++ b/Examples/SDWebImage Vision Demo/Assets.xcassets/AppIcon.solidimagestack/Front.solidimagestacklayer/Contents.json	
@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}
diff --git a/Examples/SDWebImage Vision Demo/Assets.xcassets/AppIcon.solidimagestack/Middle.solidimagestacklayer/Content.imageset/Contents.json b/Examples/SDWebImage Vision Demo/Assets.xcassets/AppIcon.solidimagestack/Middle.solidimagestacklayer/Content.imageset/Contents.json
new file mode 100644
index 000000000..04056a547
--- /dev/null
+++ b/Examples/SDWebImage Vision Demo/Assets.xcassets/AppIcon.solidimagestack/Middle.solidimagestacklayer/Content.imageset/Contents.json	
@@ -0,0 +1,12 @@
+{
+  "images" : [
+    {
+      "idiom" : "vision",
+      "scale" : "2x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}
diff --git a/Examples/SDWebImage Vision Demo/Assets.xcassets/AppIcon.solidimagestack/Middle.solidimagestacklayer/Contents.json b/Examples/SDWebImage Vision Demo/Assets.xcassets/AppIcon.solidimagestack/Middle.solidimagestacklayer/Contents.json
new file mode 100644
index 000000000..73c00596a
--- /dev/null
+++ b/Examples/SDWebImage Vision Demo/Assets.xcassets/AppIcon.solidimagestack/Middle.solidimagestacklayer/Contents.json	
@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}
diff --git a/Examples/SDWebImage Vision Demo/Assets.xcassets/Contents.json b/Examples/SDWebImage Vision Demo/Assets.xcassets/Contents.json
new file mode 100644
index 000000000..da4a164c9
--- /dev/null
+++ b/Examples/SDWebImage Vision Demo/Assets.xcassets/Contents.json	
@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}
\ No newline at end of file
diff --git a/Examples/SDWebImage Vision Demo/ContentView.swift b/Examples/SDWebImage Vision Demo/ContentView.swift
new file mode 100644
index 000000000..4a6219c15
--- /dev/null
+++ b/Examples/SDWebImage Vision Demo/ContentView.swift	
@@ -0,0 +1,114 @@
+/*
+* This file is part of the SDWebImage package.
+* (c) DreamPiggy <lizhuoli1126@126.com>
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code.
+*/
+
+import SwiftUI
+import RealityKit
+import RealityKitContent
+import SDWebImage
+import SDWebImageSwiftUI
+
+struct ContentView: View {
+    @State var imageURLs = [
+    "http://assets.sbnation.com/assets/2512203/dogflops.gif",
+    "https://raw.githubusercontent.com/liyong03/YLGIFImage/master/YLGIFImageDemo/YLGIFImageDemo/joy.gif",
+    "http://apng.onevcat.com/assets/elephant.png",
+    "http://www.ioncannon.net/wp-content/uploads/2011/06/test2.webp",
+    "http://www.ioncannon.net/wp-content/uploads/2011/06/test9.webp",
+    "http://littlesvr.ca/apng/images/SteamEngine.webp",
+    "http://littlesvr.ca/apng/images/world-cup-2014-42.webp",
+    "https://isparta.github.io/compare-webp/image/gif_webp/webp/2.webp",
+    "https://nokiatech.github.io/heif/content/images/ski_jump_1440x960.heic",
+    "https://nokiatech.github.io/heif/content/image_sequences/starfield_animation.heic",
+    "https://nr-platform.s3.amazonaws.com/uploads/platform/published_extension/branding_icon/275/AmazonS3.png",
+    "https://raw.githubusercontent.com/ibireme/YYImage/master/Demo/YYImageDemo/mew_baseline.jpg",
+    "https://via.placeholder.com/200x200.jpg",
+    "https://raw.githubusercontent.com/recurser/exif-orientation-examples/master/Landscape_5.jpg",
+    "https://dev.w3.org/SVG/tools/svgweb/samples/svg-files/w3c.svg",
+    "https://dev.w3.org/SVG/tools/svgweb/samples/svg-files/wikimedia.svg",
+    "https://raw.githubusercontent.com/icons8/flat-color-icons/master/pdf/stack_of_photos.pdf",
+    "https://raw.githubusercontent.com/icons8/flat-color-icons/master/pdf/smartphone_tablet.pdf"
+    ]
+    @State var animated: Bool = false // You can change between WebImage/AnimatedImage
+    
+    // Used to avoid https://twitter.com/fatbobman/status/1572507700436807683?s=20&t=5rfj6BUza5Jii-ynQatCFA
+    struct ItemView: View {
+        @Binding var animated: Bool
+        @State var url: String
+        var body: some View {
+            NavigationLink(destination: DetailView(url: url, animated: self.animated)) {
+                HStack {
+                    if self.animated {
+                        AnimatedImage(url: URL(string:url))
+                        .indicator(.activity)
+                        .transition(.fade)
+                        .resizable()
+                        .scaledToFit()
+                        .frame(width: CGFloat(100), height: CGFloat(100), alignment: .center)
+                    } else {
+                        WebImage(url: URL(string:url))
+                        .resizable()
+                        .indicator(.activity)
+                        .transition(.fade(duration: 0.5))
+                        .scaledToFit()
+                        .frame(width: CGFloat(100), height: CGFloat(100), alignment: .center)
+                    }
+                    Text((url as NSString).lastPathComponent)
+                }
+            }
+            .buttonStyle(PlainButtonStyle())
+        }
+    }
+
+    
+    var body: some View {
+        return NavigationView {
+            contentView()
+            .navigationBarTitle(animated ? "AnimatedImage" : "WebImage")
+            .navigationBarItems(leading:
+                Button(action: { self.reloadCache() }) {
+                    Text("Reload")
+                }, trailing:
+                Button(action: { self.switchView() }) {
+                    Text("Switch")
+                }
+            )
+        }
+    }
+    
+    func contentView() -> some View {
+        List {
+            ForEach(imageURLs, id: \.self) { url in
+                // Must use top level view instead of inlined view structure
+                ItemView(animated: $animated, url: url)
+            }
+            .onDelete { indexSet in
+                indexSet.forEach { index in
+                    self.imageURLs.remove(at: index)
+                }
+            }
+        }
+    }
+    
+    func reloadCache() {
+        SDImageCache.shared.clearMemory()
+        SDImageCache.shared.clearDisk(onCompletion: nil)
+    }
+    
+    func switchView() {
+        SDImageCache.shared.clearMemory()
+        animated.toggle()
+    }
+}
+
+#if DEBUG
+struct ContentView_Previews: PreviewProvider {
+    static var previews: some View {
+        ContentView()
+    }
+}
+#endif
diff --git a/Examples/SDWebImage Vision Demo/DetailView.swift b/Examples/SDWebImage Vision Demo/DetailView.swift
new file mode 100644
index 000000000..5bc37da63
--- /dev/null
+++ b/Examples/SDWebImage Vision Demo/DetailView.swift	
@@ -0,0 +1,48 @@
+/*
+* This file is part of the SDWebImage package.
+* (c) DreamPiggy <lizhuoli1126@126.com>
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code.
+*/
+
+import SwiftUI
+import SDWebImageSwiftUI
+
+struct DetailView: View {
+    let url: String
+    @State var animated: Bool = true // You can change between WebImage/AnimatedImage
+    @State var isAnimating: Bool = true
+    
+    var body: some View {
+        VStack {
+            contentView()
+            .navigationBarItems(trailing: Button(isAnimating ? "Stop" : "Start") {
+                self.isAnimating.toggle()
+            })
+        }
+    }
+    func contentView() -> some View {
+        HStack {
+            if animated {
+                AnimatedImage(url: URL(string:url), options: [.progressiveLoad, .delayPlaceholder], isAnimating: $isAnimating)
+                .indicator(.progress)
+                .resizable()
+                .scaledToFit()
+            } else {
+                WebImage(url: URL(string:url), options: [.progressiveLoad, .delayPlaceholder], isAnimating: $isAnimating)
+                .resizable()
+                .indicator(.progress)
+                .scaledToFit()
+            }
+        }
+    }
+}
+
+#if DEBUG
+struct DetailView_Previews: PreviewProvider {
+    static var previews: some View {
+        DetailView(url: "https://nokiatech.github.io/heif/content/images/ski_jump_1440x960.heic", animated: false)
+    }
+}
+#endif
diff --git a/Examples/SDWebImage Vision Demo/Info.plist b/Examples/SDWebImage Vision Demo/Info.plist
new file mode 100644
index 000000000..78fd311aa
--- /dev/null
+++ b/Examples/SDWebImage Vision Demo/Info.plist	
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>NSAppTransportSecurity</key>
+	<dict>
+		<key>NSAllowsArbitraryLoads</key>
+		<true/>
+	</dict>
+	<key>UIApplicationSceneManifest</key>
+	<dict>
+		<key>UIApplicationPreferredDefaultSceneSessionRole</key>
+		<string>UIWindowSceneSessionRoleApplication</string>
+		<key>UIApplicationSupportsMultipleScenes</key>
+		<true/>
+		<key>UISceneConfigurations</key>
+		<dict/>
+	</dict>
+</dict>
+</plist>
diff --git a/Examples/SDWebImage Vision Demo/Preview Content/Preview Assets.xcassets/Contents.json b/Examples/SDWebImage Vision Demo/Preview Content/Preview Assets.xcassets/Contents.json
new file mode 100644
index 000000000..73c00596a
--- /dev/null
+++ b/Examples/SDWebImage Vision Demo/Preview Content/Preview Assets.xcassets/Contents.json	
@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}
diff --git a/Examples/SDWebImage Watch Demo Extension/ExtensionDelegate.m b/Examples/SDWebImage Watch Demo Extension/ExtensionDelegate.m
index 1aa5784ea..6ecfc197c 100644
--- a/Examples/SDWebImage Watch Demo Extension/ExtensionDelegate.m	
+++ b/Examples/SDWebImage Watch Demo Extension/ExtensionDelegate.m	
@@ -8,10 +8,24 @@
 
 #import "ExtensionDelegate.h"
 
+#import <SDWebImage/SDWebImage.h>
+#import <SDWebImageWebPCoder/SDWebImageWebPCoder.h>
+
 @implementation ExtensionDelegate
 
 - (void)applicationDidFinishLaunching {
     // Perform any final initialization of your application.
+    if (@available(iOS 14, tvOS 14, macOS 11, watchOS 7, *)) {
+        // iOS 14 supports WebP built-in
+        [[SDImageCodersManager sharedManager] addCoder:[SDImageAWebPCoder sharedCoder]];
+    } else {
+        // iOS 13 does not supports WebP, use third-party codec
+        [[SDImageCodersManager sharedManager] addCoder:[SDImageWebPCoder sharedCoder]];
+    }
+    if (@available(iOS 13, tvOS 13, macOS 10.15, watchOS 6, *)) {
+        // For HEIC animated image. Animated image is new introduced in iOS 13, but it contains performance issue for now.
+        [[SDImageCodersManager sharedManager] addCoder:[SDImageHEICCoder sharedCoder]];
+    }
 }
 
 - (void)applicationDidBecomeActive {
diff --git a/Examples/SDWebImage Watch Demo Extension/InterfaceController.m b/Examples/SDWebImage Watch Demo Extension/InterfaceController.m
index f10193b6b..2c76c536c 100644
--- a/Examples/SDWebImage Watch Demo Extension/InterfaceController.m	
+++ b/Examples/SDWebImage Watch Demo Extension/InterfaceController.m	
@@ -7,12 +7,14 @@
  */
 
 #import "InterfaceController.h"
-#import <SDWebImage/UIImageView+WebCache.h>
-
+#import <SDWebImage/SDWebImage.h>
 
 @interface InterfaceController()
 
-@property (weak) IBOutlet WKInterfaceImage *imageInterface;
+@property (weak) IBOutlet WKInterfaceImage *staticImageInterface;
+@property (weak) IBOutlet WKInterfaceImage *simpleAnimatedImageInterface;
+@property (weak) IBOutlet WKInterfaceImage *animatedImageInterface;
+@property (nonatomic, strong) SDAnimatedImagePlayer *player;
 
 @end
 
@@ -29,9 +31,39 @@ - (void)willActivate {
     // This method is called when watch view controller is about to be visible to user
     [super willActivate];
     
-    NSString *urlString = @"https://nr-platform.s3.amazonaws.com/uploads/platform/published_extension/branding_icon/275/AmazonS3.png";
-    WKInterfaceImage *imageInterface = self.imageInterface;
-    [imageInterface sd_setImageWithURL:[NSURL URLWithString:urlString]];
+    [self addMenuItemWithItemIcon:WKMenuItemIconTrash title:@"Clear Cache" action:@selector(clearCache)];
+    
+    // Static image
+    NSString *urlString1 = @"http://www.ioncannon.net/wp-content/uploads/2011/06/test2.webp";
+    [self.staticImageInterface sd_setImageWithURL:[NSURL URLWithString:urlString1]];
+    
+    // Simple animated image playback
+    NSString *urlString2 = @"http://apng.onevcat.com/assets/elephant.png";
+    [self.simpleAnimatedImageInterface sd_setImageWithURL:[NSURL URLWithString:urlString2] completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+        // `WKInterfaceImage` unlike `UIImageView`. Even the image is animated image, you should explicitly call `startAnimating` to play animation.
+        [self.simpleAnimatedImageInterface startAnimating];
+    }];
+    
+    // Complicated but the best performance animated image playback
+    // If you use the above method to display this GIF (389 frames), Apple Watch will consume 800+MB and cause OOM
+    // This is actualy the same backend like `SDAnimatedImageView` on iOS, recommend to use
+    NSString *urlString3 = @"https://raw.githubusercontent.com/liyong03/YLGIFImage/master/YLGIFImageDemo/YLGIFImageDemo/joy.gif";
+    [self.animatedImageInterface sd_setImageWithURL:[NSURL URLWithString:urlString3] placeholderImage:nil options:SDWebImageProgressiveLoad context:@{SDWebImageContextAnimatedImageClass : SDAnimatedImage.class} progress:nil completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+        if (![image isKindOfClass:[SDAnimatedImage class]]) {
+            return;
+        }
+        __weak typeof(self) wself = self;
+        self.player = [SDAnimatedImagePlayer playerWithProvider:(SDAnimatedImage *)image];
+        self.player.animationFrameHandler = ^(NSUInteger index, UIImage * _Nonnull frame) {
+            [wself.animatedImageInterface setImage:frame];
+        };
+        [self.player startPlaying];
+    }];
+}
+
+- (void)clearCache {
+    [SDImageCache.sharedImageCache clearMemory];
+    [SDImageCache.sharedImageCache clearDiskOnCompletion:nil];
 }
 
 - (void)didDeactivate {
diff --git a/Examples/SDWebImage Watch Demo Extension/NotificationController.m b/Examples/SDWebImage Watch Demo Extension/NotificationController.m
index 5482f38ec..e92f6cd46 100644
--- a/Examples/SDWebImage Watch Demo Extension/NotificationController.m	
+++ b/Examples/SDWebImage Watch Demo Extension/NotificationController.m	
@@ -36,28 +36,6 @@ - (void)didDeactivate {
     [super didDeactivate];
 }
 
-/*
-- (void)didReceiveLocalNotification:(UILocalNotification *)localNotification withCompletion:(void (^)(WKUserNotificationInterfaceType))completionHandler {
-    // This method is called when a local notification needs to be presented.
-    // Implement it if you use a dynamic notification interface.
-    // Populate your dynamic notification interface as quickly as possible.
-    //
-    // After populating your dynamic notification interface call the completion block.
-    completionHandler(WKUserNotificationInterfaceTypeCustom);
-}
-*/
-
-/*
-- (void)didReceiveRemoteNotification:(NSDictionary *)remoteNotification withCompletion:(void (^)(WKUserNotificationInterfaceType))completionHandler {
-    // This method is called when a remote notification needs to be presented.
-    // Implement it if you use a dynamic notification interface.
-    // Populate your dynamic notification interface as quickly as possible.
-    //
-    // After populating your dynamic notification interface call the completion block.
-    completionHandler(WKUserNotificationInterfaceTypeCustom);
-}
-*/
-
 @end
 
 
diff --git a/Examples/SDWebImage Watch Demo/Assets.xcassets/AppIcon.appiconset/Contents.json b/Examples/SDWebImage Watch Demo/Assets.xcassets/AppIcon.appiconset/Contents.json
index dd221ba54..6c0f2b420 100644
--- a/Examples/SDWebImage Watch Demo/Assets.xcassets/AppIcon.appiconset/Contents.json	
+++ b/Examples/SDWebImage Watch Demo/Assets.xcassets/AppIcon.appiconset/Contents.json	
@@ -33,6 +33,20 @@
       "role" : "appLauncher",
       "subtype" : "38mm"
     },
+    {
+      "size" : "44x44",
+      "idiom" : "watch",
+      "scale" : "2x",
+      "role" : "appLauncher",
+      "subtype" : "40mm"
+    },
+    {
+      "size" : "50x50",
+      "idiom" : "watch",
+      "scale" : "2x",
+      "role" : "appLauncher",
+      "subtype" : "44mm"
+    },
     {
       "size" : "86x86",
       "idiom" : "watch",
@@ -46,10 +60,22 @@
       "scale" : "2x",
       "role" : "quickLook",
       "subtype" : "42mm"
+    },
+    {
+      "size" : "108x108",
+      "idiom" : "watch",
+      "scale" : "2x",
+      "role" : "quickLook",
+      "subtype" : "44mm"
+    },
+    {
+      "idiom" : "watch-marketing",
+      "size" : "1024x1024",
+      "scale" : "1x"
     }
   ],
   "info" : {
     "version" : 1,
     "author" : "xcode"
   }
-}
+}
\ No newline at end of file
diff --git a/Examples/SDWebImage Watch Demo/Base.lproj/Interface.storyboard b/Examples/SDWebImage Watch Demo/Base.lproj/Interface.storyboard
index d2788c7e3..313802b54 100644
--- a/Examples/SDWebImage Watch Demo/Base.lproj/Interface.storyboard	
+++ b/Examples/SDWebImage Watch Demo/Base.lproj/Interface.storyboard	
@@ -1,8 +1,10 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder.WatchKit.Storyboard" version="3.0" toolsVersion="10117" systemVersion="15F34" targetRuntime="watchKit" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="AgC-eL-Hgc">
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder.WatchKit.Storyboard" version="3.0" toolsVersion="15505" targetRuntime="watchKit" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="AgC-eL-Hgc">
+    <device id="watch38"/>
     <dependencies>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="10085"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBWatchKitPlugin" version="10032"/>
+        <deployment identifier="watchOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="15509"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBWatchKitPlugin" version="15501"/>
     </dependencies>
     <scenes>
         <!--Interface Controller-->
@@ -10,10 +12,14 @@
             <objects>
                 <controller id="AgC-eL-Hgc" customClass="InterfaceController">
                     <items>
-                        <imageView height="150" alignment="left" id="tBV-Mv-OtJ"/>
+                        <imageView alignment="left" contentMode="scaleAspectFit" id="Tox-Rh-1mN"/>
+                        <imageView alignment="left" contentMode="scaleAspectFit" id="tBV-Mv-OtJ"/>
+                        <imageView alignment="left" contentMode="scaleAspectFit" id="7dg-wI-usi"/>
                     </items>
                     <connections>
-                        <outlet property="imageInterface" destination="tBV-Mv-OtJ" id="uId-u2-it3"/>
+                        <outlet property="animatedImageInterface" destination="7dg-wI-usi" id="eDq-ra-x9k"/>
+                        <outlet property="simpleAnimatedImageInterface" destination="tBV-Mv-OtJ" id="Wzc-db-ghd"/>
+                        <outlet property="staticImageInterface" destination="Tox-Rh-1mN" id="M4p-h5-1ld"/>
                     </connections>
                 </controller>
             </objects>
diff --git a/LICENSE b/LICENSE
index 92a252a9f..2f5785d2d 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2009-2017 Olivier Poitrey rs@dailymotion.com
+Copyright (c) 2009-2020 Olivier Poitrey rs@dailymotion.com
  
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/Package.swift b/Package.swift
new file mode 100644
index 000000000..c713dc274
--- /dev/null
+++ b/Package.swift
@@ -0,0 +1,49 @@
+// swift-tools-version:5.3
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "SDWebImage",
+    platforms: [
+        .macOS(.v10_11),
+        .iOS(.v9),
+        .tvOS(.v9),
+        .watchOS(.v2)
+    ],
+    products: [
+        // Products define the executables and libraries produced by a package, and make them visible to other packages.
+        .library(
+            name: "SDWebImage",
+            targets: ["SDWebImage"]),
+        .library(
+            name: "SDWebImageMapKit",
+            targets: ["SDWebImageMapKit"])
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages which this package depends on.
+        .target(
+            name: "SDWebImage",
+            dependencies: [],
+            path: "SDWebImage",
+            sources: ["Core", "Private"],
+            resources: [.copy("Resources/PrivacyInfo.xcprivacy")],
+            cSettings: [
+                .headerSearchPath("Core"),
+                .headerSearchPath("Private")
+            ]
+        ),
+        .target(
+            name: "SDWebImageMapKit",
+            dependencies: ["SDWebImage"],
+            path: "SDWebImageMapKit",
+            sources: ["MapKit"],
+            resources: [.copy("Resources/PrivacyInfo.xcprivacy")]
+        )
+    ]
+)
diff --git a/Podfile b/Podfile
new file mode 100644
index 000000000..09a68abc5
--- /dev/null
+++ b/Podfile
@@ -0,0 +1,103 @@
+use_frameworks!
+
+def all_example_pods
+  pod 'SDWebImage/MapKit', :path => './'
+  pod 'SDWebImageWebPCoder', :git => 'https://github.com/SDWebImage/SDWebImageWebPCoder.git', :branch => 'master'
+end
+
+def watch_example_pods
+  pod 'SDWebImage/Core', :path => './'
+  pod 'SDWebImageWebPCoder', :git => 'https://github.com/SDWebImage/SDWebImageWebPCoder.git', :branch => 'master'
+end
+
+def vision_example_pods
+  pod 'SDWebImage/MapKit', :path => './'
+  pod 'SDWebImageSwiftUI', :git => 'https://github.com/SDWebImage/SDWebImageSwiftUI.git', :branch => 'master'
+end
+
+def all_test_pods
+  pod 'SDWebImage/MapKit', :path => './'
+  # These two Pods seems no longer maintained...
+  pod 'Expecta', :podspec => 'Tests/Expecta.podspec'
+  pod 'KVOController', :podspec => 'Tests/KVOController.podspec'
+end
+
+example_project_path = 'Examples/SDWebImage Demo'
+test_project_path = 'Tests/SDWebImage Tests'
+workspace 'SDWebImage.xcworkspace'
+
+# Example Project
+target 'SDWebImage iOS Demo' do
+  project example_project_path
+  platform :ios, '9.0'
+  all_example_pods
+end
+
+target 'SDWebImage OSX Demo' do
+  project example_project_path
+  platform :osx, '10.11'
+  all_example_pods
+end
+
+target 'SDWebImage TV Demo' do
+  project example_project_path
+  platform :tvos, '9.0'
+  all_example_pods
+end
+
+target 'SDWebImage Watch Demo Extension' do
+  project example_project_path
+  platform :watchos, '2.0'
+  watch_example_pods
+end
+
+target 'SDWebImage Vision Demo' do
+  project example_project_path
+  platform :visionos, '1.0'
+  vision_example_pods
+end
+
+# Test Project
+target 'Tests iOS' do
+  project test_project_path
+  platform :ios, '9.0'
+  all_test_pods
+end
+
+target 'Tests Mac' do
+  project test_project_path
+  platform :osx, '10.11'
+  all_test_pods
+end
+
+target 'Tests TV' do
+  project test_project_path
+  platform :tvos, '9.0'
+  all_test_pods
+end
+
+target 'Tests Vision' do
+  project test_project_path
+  platform :visionos, '1.0'
+  all_test_pods
+end
+
+# Inject macro during SDWebImage Demo and Tests
+post_install do |installer_representation|
+  installer_representation.pods_project.targets.each do |target|
+    if target.product_name == 'SDWebImage'
+      target.build_configurations.each do |config|
+        config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] = '$(inherited) SD_CHECK_CGIMAGE_RETAIN_SOURCE=1'
+      end
+    else
+      target.build_configurations.each do |config|
+        # Override the min deployment target for some test specs to workaround `libarclite.a` missing issue
+        config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'] = '9.0'
+        config.build_settings['MACOSX_DEPLOYMENT_TARGET'] = '10.11'
+        config.build_settings['TVOS_DEPLOYMENT_TARGET'] = '9.0'
+        config.build_settings['WATCHOS_DEPLOYMENT_TARGET'] = '2.0'
+        config.build_settings['XROS_DEPLOYMENT_TARGET'] = '1.0'
+      end
+    end
+  end
+end
diff --git a/README.md b/README.md
index c8bd848b2..302e05486 100644
--- a/README.md
+++ b/README.md
@@ -1,62 +1,151 @@
 <p align="center" >
-  <img src="SDWebImage_logo.png" title="SDWebImage logo" float=left>
+  <img src="https://raw.githubusercontent.com/SDWebImage/SDWebImage/master/SDWebImage_logo.png" title="SDWebImage logo" float=left>
 </p>
 
 
-[![Build Status](http://img.shields.io/travis/rs/SDWebImage/master.svg?style=flat)](https://travis-ci.org/rs/SDWebImage)
+[![Build Status](https://github.com/SDWebImage/SDWebImage/actions/workflows/CI.yml/badge.svg)](https://github.com/SDWebImage/SDWebImage/actions/workflows/CI.yml)
 [![Pod Version](http://img.shields.io/cocoapods/v/SDWebImage.svg?style=flat)](http://cocoadocs.org/docsets/SDWebImage/)
 [![Pod Platform](http://img.shields.io/cocoapods/p/SDWebImage.svg?style=flat)](http://cocoadocs.org/docsets/SDWebImage/)
 [![Pod License](http://img.shields.io/cocoapods/l/SDWebImage.svg?style=flat)](https://www.apache.org/licenses/LICENSE-2.0.html)
-[![Dependency Status](https://www.versioneye.com/objective-c/sdwebimage/badge.svg?style=flat)](https://www.versioneye.com/objective-c/sdwebimage)
-[![Reference Status](https://www.versioneye.com/objective-c/sdwebimage/reference_badge.svg?style=flat)](https://www.versioneye.com/objective-c/sdwebimage/references)
-[![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/rs/SDWebImage)
-[![codecov](https://codecov.io/gh/rs/SDWebImage/branch/master/graph/badge.svg)](https://codecov.io/gh/rs/SDWebImage)
+[![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-brightgreen.svg)](https://github.com/SDWebImage/SDWebImage)
+[![SwiftPM compatible](https://img.shields.io/badge/SwiftPM-compatible-brightgreen.svg)](https://swift.org/package-manager/)
+[![Mac Catalyst compatible](https://img.shields.io/badge/Catalyst-compatible-brightgreen.svg)](https://developer.apple.com/documentation/xcode/creating_a_mac_version_of_your_ipad_app/)
+[![codecov](https://codecov.io/gh/SDWebImage/SDWebImage/branch/master/graph/badge.svg)](https://codecov.io/gh/SDWebImage/SDWebImage)
 
 This library provides an async image downloader with cache support. For convenience, we added categories for UI elements like `UIImageView`, `UIButton`, `MKAnnotationView`.
 
+> 💡NOTE: `SD` is the prefix for **Simple Design** (which is the team name in Daily Motion company from the author Olivier Poitrey)
+
 ## Features
 
 - [x] Categories for `UIImageView`, `UIButton`, `MKAnnotationView` adding web image and cache management
 - [x] An asynchronous image downloader
 - [x] An asynchronous memory + disk image caching with automatic cache expiration handling
-- [x] A background image decompression
+- [x] A background image decompression to avoid frame rate drop
+- [x] [Progressive image loading](https://github.com/SDWebImage/SDWebImage/wiki/Advanced-Usage#progressive-animation) (including animated image, like GIF showing in Web browser)
+- [x] [Thumbnail image decoding](https://github.com/SDWebImage/SDWebImage/wiki/Advanced-Usage#thumbnail-decoding-550) to save CPU && Memory for large images
+- [x] [Extendable image coder](https://github.com/SDWebImage/SDWebImage/wiki/Advanced-Usage#custom-coder-420) to support massive image format, like WebP
+- [x] [Full-stack solution for animated images](https://github.com/SDWebImage/SDWebImage/wiki/Advanced-Usage#animated-image-50) which keep a balance between CPU && Memory
+- [x] [Customizable and composable transformations](https://github.com/SDWebImage/SDWebImage/wiki/Advanced-Usage#transformer-50) can be applied to the images right after download
+- [x] [Customizable and multiple caches system](https://github.com/SDWebImage/SDWebImage/wiki/Advanced-Usage#custom-cache-50)
+- [x] [Customizable and multiple loaders system](https://github.com/SDWebImage/SDWebImage/wiki/Advanced-Usage#custom-loader-50) to expand the capabilities, like [Photos Library](https://github.com/SDWebImage/SDWebImagePhotosPlugin)
+- [x] [Image loading indicators](https://github.com/SDWebImage/SDWebImage/wiki/How-to-use#use-view-indicator-50)
+- [x] [Image loading transition animation](https://github.com/SDWebImage/SDWebImage/wiki/Advanced-Usage#image-transition-430)
 - [x] A guarantee that the same URL won't be downloaded several times
 - [x] A guarantee that bogus URLs won't be retried again and again
 - [x] A guarantee that main thread will never be blocked
+- [x] Modern Objective-C and better Swift support 
 - [x] Performances!
-- [x] Use GCD and ARC
+
+## For Apple visionOS
+
+From 5.19+, SDWebImage supports visionOS on all Package Managers (include CocoaPods/Carthage/SPM). Upgrade the related tools if you're facing issues.
+
+For 5.18+, SDWebImage can be compiled for visionOS platform. However, it's still in beta and may contains issues unlike the stable iOS UIKit support. Welcome to have a try and [report issue](https://github.com/SDWebImage/SDWebImage/issues).
+
+To build on visionOS, currently we only support the standard Xcode integration.
+
+See `Installation with Swift Package Manager` and `Manual Installation Guide` below.
 
 ## Supported Image Formats
 
-- Image formats supported by UIImage (JPEG, PNG, ...), including GIF
-- WebP format, including animated WebP (use the `WebP` subspec)
+- Image formats supported by Apple system (JPEG, PNG, TIFF, BMP, ...), including [GIF](https://github.com/SDWebImage/SDWebImage/wiki/Advanced-Usage#gif-coder)/[APNG](https://github.com/SDWebImage/SDWebImage/wiki/Advanced-Usage#apng-coder) animated image
+- HEIC format from iOS 11/macOS 10.13, including animated HEIC from iOS 13/macOS 10.15 via [SDWebImageHEICCoder](https://github.com/SDWebImage/SDWebImage/wiki/Advanced-Usage#heic-coder). For lower firmware, use coder plugin [SDWebImageHEIFCoder](https://github.com/SDWebImage/SDWebImageHEIFCoder)
+- WebP format from iOS 14/macOS 11.0 via [SDWebImageAWebPCoder](https://github.com/SDWebImage/SDWebImage/wiki/Advanced-Usage#awebp-coder). For lower firmware, use coder plugin [SDWebImageWebPCoder](https://github.com/SDWebImage/SDWebImageWebPCoder)
+- JPEG-XL format from iOS 17/macOS 14.0 built-in. For lower firmware, use coder plugin [SDWebImageJPEGXLCoder](https://github.com/SDWebImage/SDWebImageJPEGXLCoder)
+- Support extendable coder plugins for new image formats like BPG, AVIF. And vector format like PDF, SVG. See all the list in [Image coder plugin List](https://github.com/SDWebImage/SDWebImage/wiki/Coder-Plugin-List)
+
+> 💡NOTE: For new user
+
+SDWebImage use [Coder Plugin System](https://github.com/SDWebImage/SDWebImage/wiki/Coder-Plugin-List) to support both Apple's built-in and external image format. For static image we always use Apple's built-in as fallback, but not for animated image. Currently (updated to 5.19.x version) we only register traditional animated format like GIF/APNG by default, without the modern format like AWebP/HEICS/AVIF, even on the latest firmware.
+
+If you want these animated image format support, simply register by yourself with one-line code, see more in [WebP Coder](https://github.com/SDWebImage/SDWebImage/wiki/Advanced-Usage#awebp-coder) and [HEIC Coder](https://github.com/SDWebImage/SDWebImage/wiki/Advanced-Usage#heic-coder)
+
+In future we will change this behavior by always registering all Apple's built-in animated image format, to make it easy for new user to integrate.
+
+## Additional modules and Ecosystem
+
+In order to keep SDWebImage focused and limited to the core features, but also allow extensibility and custom behaviors, during the 5.0 refactoring we focused on modularizing the library.
+As such, we have moved/built new modules to [SDWebImage org](https://github.com/SDWebImage).
+
+#### SwiftUI
+[SwiftUI](https://developer.apple.com/xcode/swiftui/) is an innovative UI framework written in Swift to build user interfaces across all Apple platforms.
+
+We support SwiftUI by building a brand new framework called [SDWebImageSwiftUI](https://github.com/SDWebImage/SDWebImageSwiftUI), which is built on top of SDWebImage core functions (caching, loading and animation).
+
+The new framework introduce two View structs `WebImage` and `AnimatedImage` for SwiftUI world, `ImageIndicator` modifier for any View, `ImageManager` observable object for data source. Supports iOS 13+/macOS 10.15+/tvOS 13+/watchOS 6+ and Swift 5.1. Have a nice try and provide feedback!
+
+#### Coders for additional image formats
+- [SDWebImageWebPCoder](https://github.com/SDWebImage/SDWebImageWebPCoder) - coder for WebP format. iOS 9+/macOS 10.11+. Based on [libwebp](https://chromium.googlesource.com/webm/libwebp)
+- [SDWebImageHEIFCoder](https://github.com/SDWebImage/SDWebImageHEIFCoder) - coder for HEIF format, iOS 9+/macOS 10.11+ support. Based on [libheif](https://github.com/strukturag/libheif)
+- [SDWebImageBPGCoder](https://github.com/SDWebImage/SDWebImageBPGCoder) - coder for BPG format. Based on [libbpg](https://github.com/mirrorer/libbpg)
+- [SDWebImageFLIFCoder](https://github.com/SDWebImage/SDWebImageFLIFCoder) - coder for FLIF format. Based on [libflif](https://github.com/FLIF-hub/FLIF)
+- [SDWebImageAVIFCoder](https://github.com/SDWebImage/SDWebImageAVIFCoder) - coder for AVIF (AV1-based) format. Based on [libavif](https://github.com/AOMediaCodec/libavif)
+- [SDWebImagePDFCoder](https://github.com/SDWebImage/SDWebImagePDFCoder) - coder for PDF vector format. Using built-in frameworks
+- [SDWebImageSVGCoder](https://github.com/SDWebImage/SDWebImageSVGCoder) - coder for SVG vector format. Using built-in frameworks
+- [SDWebImageSVGNativeCoder](https://github.com/SDWebImage/SDWebImageSVGNativeCoder) - coder for SVG-Native vector format. Based on [svg-native](https://github.com/adobe/svg-native-viewer)
+- [SDWebImageLottieCoder](https://github.com/SDWebImage/SDWebImageLottieCoder) - coder for Lottie animation format. Based on [rlottie](https://github.com/Samsung/rlottie)
+- [SDWebImageJPEGXLCoder](https://github.com/SDWebImage/SDWebImageJPEGXLCoder) - coder for JPEG-XL format. iOS 9+/macOS 10.11+. Based on [libjxl](https://github.com/libjxl/libjxl)
+- and more from community!
+
+#### Custom Caches
+- [SDWebImageYYPlugin](https://github.com/SDWebImage/SDWebImageYYPlugin) - plugin to support caching images with [YYCache](https://github.com/ibireme/YYCache)
+- [SDWebImagePINPlugin](https://github.com/SDWebImage/SDWebImagePINPlugin) - plugin to support caching images with [PINCache](https://github.com/pinterest/PINCache)
+
+#### Custom Loaders
+- [SDWebImagePhotosPlugin](https://github.com/SDWebImage/SDWebImagePhotosPlugin) - plugin to support loading images from Photos (using `Photos.framework`) 
+- [SDWebImageLinkPlugin](https://github.com/SDWebImage/SDWebImageLinkPlugin) - plugin to support loading images from rich link url, as well as `LPLinkView` (using `LinkPresentation.framework`) 
+
+#### Integration with 3rd party libraries
+- [SDWebImageLottiePlugin](https://github.com/SDWebImage/SDWebImageLottiePlugin) - plugin to support [Lottie-iOS](https://github.com/airbnb/lottie-ios), vector animation rending with remote JSON files
+- [SDWebImageSVGKitPlugin](https://github.com/SDWebImage/SDWebImageSVGKitPlugin) - plugin to support [SVGKit](https://github.com/SVGKit/SVGKit), SVG rendering using Core Animation, iOS 9+/macOS 10.11+ support
+- [SDWebImageFLPlugin](https://github.com/SDWebImage/SDWebImageFLPlugin) - plugin to support [FLAnimatedImage](https://github.com/Flipboard/FLAnimatedImage) as the engine for animated GIFs
+- [SDWebImageYYPlugin](https://github.com/SDWebImage/SDWebImageYYPlugin) - plugin to integrate [YYImage](https://github.com/ibireme/YYImage) & [YYCache](https://github.com/ibireme/YYCache) for image rendering & caching
+
+#### Community driven popular libraries
+- [FirebaseUI](https://github.com/firebase/FirebaseUI-iOS) - Firebase Storage binding for query images, based on SDWebImage loader system
+- [react-native-fast-image](https://github.com/DylanVann/react-native-fast-image) - React Native fast image component, based on SDWebImage Animated Image solution
+- [flutter_image_compress](https://github.com/OpenFlutter/flutter_image_compress) - Flutter compresses image plugin, based on SDWebImage WebP coder plugin
+
+#### Make our lives easier
+- [libwebp-Xcode](https://github.com/SDWebImage/libwebp-Xcode) - A wrapper for [libwebp](https://chromium.googlesource.com/webm/libwebp) + an Xcode project.
+- [libheif-Xcode](https://github.com/SDWebImage/libheif-Xcode) - A wrapper for [libheif](https://github.com/strukturag/libheif) + an Xcode project.
+- [libavif-Xcode](https://github.com/SDWebImage/libavif-Xcode) - A wrapper for [libavif](https://github.com/AOMediaCodec/libavif) + an Xcode project.
+- and more third-party C/C++ image codec libraries with CocoaPods/Carthage/SwiftPM support.
+
+You can use those directly, or create similar components of your own, by using the customizable architecture of SDWebImage.
 
 ## Requirements
 
-- iOS 7.0 or later
+- iOS 9.0 or later
 - tvOS 9.0 or later
 - watchOS 2.0 or later
-- macOS 10.9 or later
-- Xcode 7.3 or later
+- macOS 10.11 or later (10.15 for Catalyst)
+- visionOS 1.0 or later
+- Xcode 15.0 or later
 
 #### Backwards compatibility
 
-- For iOS 5 and 6, use [any 3.x version up to 3.7.6](https://github.com/rs/SDWebImage/tree/3.7.6)
-- For iOS < 5.0, please use the last [2.0 version](https://github.com/rs/SDWebImage/tree/2.0-compat).
+- For iOS 8, macOS 10.10 or Xcode < 11, use [any 5.x version up to 5.9.5](https://github.com/SDWebImage/SDWebImage/releases/tag/5.9.5)
+- For iOS 7, macOS 10.9 or Xcode < 8, use [any 4.x version up to 4.4.6](https://github.com/SDWebImage/SDWebImage/releases/tag/4.4.6)
+- For macOS 10.8, use [any 4.x version up to 4.3.0](https://github.com/SDWebImage/SDWebImage/releases/tag/4.3.0)
+- For iOS 5 and 6, use [any 3.x version up to 3.7.6](https://github.com/SDWebImage/SDWebImage/releases/tag/3.7.6)
+- For iOS < 5.0, please use the last [2.0 version](https://github.com/SDWebImage/SDWebImage/tree/2.0-compat).
 
 ## Getting Started
 
 - Read this Readme doc
-- Read the [How to use section](https://github.com/rs/SDWebImage#how-to-use)
-- Read the [Documentation @ CocoaDocs](http://cocoadocs.org/docsets/SDWebImage/)
+- Read the [How to use section](https://github.com/SDWebImage/SDWebImage#how-to-use)
+- Read the [Latest Documentation](https://sdwebimage.github.io/) and [CocoaDocs for old version](http://cocoadocs.org/docsets/SDWebImage/)
 - Try the example by downloading the project from Github or even easier using CocoaPods try `pod try SDWebImage`
-- Read the [Installation Guide](https://github.com/rs/SDWebImage/wiki/Installation-Guide)
-- Read the [SDWebImage 4.0 Migration Guide](Docs/SDWebImage-4.0-Migration-guide.md) to get an idea of the changes from 3.x to 4.x
-- Read the [Common Problems](https://github.com/rs/SDWebImage/wiki/Common-Problems) to find the solution for common problems 
-- Go to the [Wiki Page](https://github.com/rs/SDWebImage/wiki) for more information such as [Advanced Usage](https://github.com/rs/SDWebImage/wiki/Advanced-Usage)
+- Read the [Installation Guide](https://github.com/SDWebImage/SDWebImage/wiki/Installation-Guide)
+- Read the [SDWebImage 5.0 Migration Guide](https://github.com/SDWebImage/SDWebImage/blob/master/Docs/SDWebImage-5.0-Migration-guide.md) to get an idea of the changes from 4.x to 5.x
+- Read the [SDWebImage 4.0 Migration Guide](https://github.com/SDWebImage/SDWebImage/blob/master/Docs/SDWebImage-4.0-Migration-guide.md) to get an idea of the changes from 3.x to 4.x
+- Read the [Common Problems](https://github.com/SDWebImage/SDWebImage/wiki/Common-Problems) to find the solution for common problems 
+- Go to the [Wiki Page](https://github.com/SDWebImage/SDWebImage/wiki) for more information such as [Advanced Usage](https://github.com/SDWebImage/SDWebImage/wiki/Advanced-Usage)
 
 ## Who Uses It
-- Find out [who uses SDWebImage](https://github.com/rs/SDWebImage/wiki/Who-Uses-SDWebImage) and add your app to the list.
+- Find out [who uses SDWebImage](https://github.com/SDWebImage/SDWebImage/wiki/Who-Uses-SDWebImage) and add your app to the list.
 
 ## Communication
 
@@ -64,14 +153,20 @@ This library provides an async image downloader with cache support. For convenie
 - If you'd like to **ask a general question**, use [Stack Overflow](http://stackoverflow.com/questions/tagged/sdwebimage).
 - If you **found a bug**, open an issue.
 - If you **have a feature request**, open an issue.
-- If you **want to contribute**, submit a pull request.
+- If you **need IRC channel**, use [Gitter](https://gitter.im/SDWebImage/community).
+
+## Contribution
+
+- If you **want to contribute**, read the [Contributing Guide](https://github.com/SDWebImage/SDWebImage/blob/master/.github/CONTRIBUTING.md)
+- For **development contribution guide**, read the [How-To-Contribute](https://github.com/SDWebImage/SDWebImage/wiki/How-to-Contribute)
+- For **understanding code architecture**, read the [Code Architecture Analysis](https://github.com/SDWebImage/SDWebImage/wiki/5.6-Code-Architecture-Analysis)
 
 ## How To Use
 
 * Objective-C
 
 ```objective-c
-#import <SDWebImage/UIImageView+WebCache.h>
+#import <SDWebImage/SDWebImage.h>
 ...
 [imageView sd_setImageWithURL:[NSURL URLWithString:@"http://www.domain.com/path/to/image.jpg"]
              placeholderImage:[UIImage imageNamed:@"placeholder.png"]];
@@ -85,22 +180,47 @@ import SDWebImage
 imageView.sd_setImage(with: URL(string: "http://www.domain.com/path/to/image.jpg"), placeholderImage: UIImage(named: "placeholder.png"))
 ```
 
-- For details about how to use the library and clear examples, see [The detailed How to use](Docs/HowToUse.md)
+- For details about how to use the library and clear examples, see [The detailed How to use](https://github.com/SDWebImage/SDWebImage/blob/master/Docs/HowToUse.md)
 
 ## Animated Images (GIF) support
 
-- Starting with the 4.0 version, we rely on [FLAnimatedImage](https://github.com/Flipboard/FLAnimatedImage) to take care of our animated images. 
-- If you use cocoapods, add `pod 'SDWebImage/GIF'` to your podfile.
-- To use it, simply make sure you use `FLAnimatedImageView` instead of `UIImageView`.
-- **Note**: there is a backwards compatible feature, so if you are still trying to load a GIF into a `UIImageView`, it will only show the 1st frame as a static image by default. However, you can enable the full GIF support by using the built-in GIF coder. See [GIF coder](https://github.com/rs/SDWebImage/wiki/Advanced-Usage#gif-coder)
-- **Important**: FLAnimatedImage only works on the iOS platform. For macOS, use `NSImageView` with `animates` set to `YES` to show the entire animated images and `NO` to only show the 1st frame. For all the other platforms (tvOS, watchOS) we will fallback to the backwards compatibility feature described above 
+In 5.0, we introduced a brand new mechanism for supporting animated images. This includes animated image loading, rendering, decoding, and also supports customizations (for advanced users).
+
+This animated image solution is available for `iOS`/`tvOS`/`macOS`. The `SDAnimatedImage` is subclass of `UIImage/NSImage`, and `SDAnimatedImageView` is subclass of `UIImageView/NSImageView`, to make them compatible with the common frameworks APIs.
+
+The `SDAnimatedImageView` supports the familiar image loading category methods, works like drop-in replacement for `UIImageView/NSImageView`.
+
+Don't have `UIView` (like `WatchKit` or `CALayer`)? you can still use `SDAnimatedPlayer` the player engine for advanced playback and rendering.
+
+See [Animated Image](https://github.com/SDWebImage/SDWebImage/wiki/Advanced-Usage#animated-image-50) for more detailed information.
+
+* Objective-C
+
+```objective-c
+SDAnimatedImageView *imageView = [SDAnimatedImageView new];
+SDAnimatedImage *animatedImage = [SDAnimatedImage imageNamed:@"image.gif"];
+imageView.image = animatedImage;
+```
+
+* Swift
+
+```swift
+let imageView = SDAnimatedImageView()
+let animatedImage = SDAnimatedImage(named: "image.gif")
+imageView.image = animatedImage
+```
+
+#### FLAnimatedImage integration has its own dedicated repo
+In order to clean up things and make our core project do less things, we decided that the `FLAnimatedImage` integration does not belong here. From 5.0, this will still be available, but under a dedicated repo [SDWebImageFLPlugin](https://github.com/SDWebImage/SDWebImageFLPlugin).
 
 ## Installation
 
-There are three ways to use SDWebImage in your project:
+There are 5 ways to use SDWebImage in your project:
 - using CocoaPods
 - using Carthage
-- by cloning the project into your repository
+- using Swift Package Manager
+- download binary XCFramework
+- manual install (build frameworks or embed Xcode Project)
 
 ### Installation with CocoaPods
 
@@ -108,45 +228,155 @@ There are three ways to use SDWebImage in your project:
 
 #### Podfile
 ```
-platform :ios, '7.0'
-pod 'SDWebImage', '~> 4.0'
+platform :ios, '8.0'
+pod 'SDWebImage', '~> 5.0'
 ```
 
-If you are using Swift, be sure to add `use_frameworks!` and set your target to iOS 8+:
+##### Swift and static framework
+
+Swift project previously had to use `use_frameworks!` to make all Pods into dynamic framework to let CocoaPods work.
+
+However, starting with `CocoaPods 1.5.0+` (with `Xcode 9+`), which supports to build both Objective-C && Swift code into static framework. You can use modular headers to use SDWebImage as static framework, without the need of `use_frameworks!`:
+
+```
+platform :ios, '8.0'
+# Uncomment the next line when you want all Pods as static framework
+# use_modular_headers!
+pod 'SDWebImage', :modular_headers => true
+```
+
+See more on [CocoaPods 1.5.0 — Swift Static Libraries](http://blog.cocoapods.org/CocoaPods-1.5.0/)
+
+If not, you still need to add `use_frameworks!` to use SDWebImage as dynamic framework:
+
 ```
 platform :ios, '8.0'
 use_frameworks!
+pod 'SDWebImage'
 ```
 
 #### Subspecs
 
-There are 4 subspecs available now: `Core`, `MapKit`, `GIF` and `WebP` (this means you can install only some of the SDWebImage modules. By default, you get just `Core`, so if you need `WebP`, you need to specify it). 
+There are 2 subspecs available now: `Core` and `MapKit` (this means you can install only some of the SDWebImage modules. By default, you get just `Core`, so if you need `MapKit`, you need to specify it). 
 
 Podfile example:
+
 ```
-pod 'SDWebImage/WebP'
+pod 'SDWebImage/MapKit'
 ```
 
-### Installation with Carthage (iOS 8+)
+### Installation with Carthage
 
 [Carthage](https://github.com/Carthage/Carthage) is a lightweight dependency manager for Swift and Objective-C. It leverages CocoaTouch modules and is less invasive than CocoaPods.
 
 To install with carthage, follow the instruction on [Carthage](https://github.com/Carthage/Carthage)
 
-#### Cartfile
+Carthage users can point to this repository and use whichever generated framework they'd like: SDWebImage, SDWebImageMapKit or both.
+
+Make the following entry in your Cartfile: `github "SDWebImage/SDWebImage"`
+Then run `carthage update`
+If this is your first time using Carthage in the project, you'll need to go through some additional steps as explained [over at Carthage](https://github.com/Carthage/Carthage#adding-frameworks-to-an-application).
+
+> 💡NOTE: At this time, Carthage does not provide a way to build only specific repository subcomponents (or equivalent of CocoaPods's subspecs). All components and their dependencies will be built with the above command. However, you don't need to copy frameworks you aren't using into your project. For instance, if you aren't using `SDWebImageMapKit`, feel free to delete that framework from the Carthage Build directory after `carthage update` completes.
+
+> 💡NOTE: [Apple requires SDWebImage contains signatures](https://developer.apple.com/support/third-party-SDK-requirements/). So, by default the `carthage build` binary framework does not do codesign, this will cause validation error. You can sign yourself with the Apple Developer Program identity, or using the binary framework:
+
 ```
-github "rs/SDWebImage"
+binary "https://github.com/SDWebImage/SDWebImage/raw/master/SDWebImage.json"
 ```
 
-### Installation by cloning the repository
-- see [Manual install](Docs/ManualInstallation.md)
+### Installation with Swift Package Manager (Xcode 11+)
+
+[Swift Package Manager](https://swift.org/package-manager/) (SwiftPM) is a tool for managing the distribution of Swift code as well as C-family dependency. From Xcode 11, SwiftPM got natively integrated with Xcode.
+
+SDWebImage support SwiftPM from version 5.1.0. To use SwiftPM, you should use Xcode 11 to open your project. Click `File` -> `Swift Packages` -> `Add Package Dependency`, enter [SDWebImage repo's URL](https://github.com/SDWebImage/SDWebImage.git). Or you can login Xcode with your GitHub account and just type `SDWebImage` to search.
+
+After select the package, you can choose the dependency type (tagged version, branch or commit). Then Xcode will setup all the stuff for you.
+
+If you're a framework author and use SDWebImage as a dependency, update your `Package.swift` file:
+
+```swift
+let package = Package(
+    // 5.1.0 ..< 6.0.0
+    dependencies: [
+        .package(url: "https://github.com/SDWebImage/SDWebImage.git", from: "5.1.0")
+    ],
+    // ...
+)
+```
+
+### Download binary XCFramework
+
+From 5.19.2, SDWebImage provide the canonical official binary XCFramework on [GitHub release pages](https://github.com/SDWebImage/SDWebImage/releases).
+
++ Download XCFramework
+
+You can choose to download `SDWebImage-dynamic.xcframework.zip` for dynamic linked one, or `SDWebImage-static.xcframework.zip` for static-linked one.
+
++ Integrate to Xcode Project
+
+Drag the unzipped `.xcframework` into your Xcode Project's Framework tab.
+
++ Verify signature of binary XCFramework
+
+From Xcode 15 Apple will verify the signature of binary XCFramework, to avoid supply chain attack.
+
+The fingerprint currently should be `FC 3B 10 13 86 34 4C 50 DB 70 2A 9A D1 01 6F B5 1A 3E CC 8B 9D A9 B7 AE 47 A0 48 D4 D0 63 39 83`
+
+The certificate is stored in the repo [here](https://github.com/SDWebImage/SDWebImage/blob/master/Certificate/SDWebImage%20Signing%20Certificate.cer)
+
+The public key is stored in the repo [here](https://github.com/SDWebImage/SDWebImage/blob/master/Certificate/SDWebImage%20Signing%20Certificate.pem)
+
+See more: [Verifying the origin of your XCFrameworks](https://developer.apple.com/documentation/Xcode/verifying-the-origin-of-your-xcframeworks)
+
+
+### Manual Installation Guide
+
++ Check your command line Xcode version
+
+```
+sudo xcode-select -s /path/to/Xcode.app
+```
+
+or
+
+```
+export DEVELOPER_DIR=/path/to/Xcode.app/Contents/Developer
+```
+
++ Run the script to build frameworks
+
+```
+./Scripts/build-frameworks.sh
+```
+
++ Run the script to merge XCFramework
+
+```
+./Scripts/create-xcframework.sh
+```
+
++ Use your own certificate to sign XCFramework
+
+```
+// https://developer.apple.com/support/third-party-SDK-requirements/
+codesign --timestamp -v --sign "your own certificate" SDWebImage.xcframework
+```
+
+See more on wiki: [Manual install Guide](https://github.com/SDWebImage/SDWebImage/wiki/Installation-Guide#manual-installation-guide)
 
 ### Import headers in your source files
 
-In the source files where you need to use the library, import the header file:
+In the source files where you need to use the library, import the umbrella header file:
 
 ```objective-c
-#import <SDWebImage/UIImageView+WebCache.h>
+#import <SDWebImage/SDWebImage.h>
+```
+
+It's also recommend to use the module import syntax, available for CocoaPods(enable `modular_headers`)/Carthage/SwiftPM.
+
+```objecitivec
+@import SDWebImage;
 ```
 
 ### Build Project
@@ -154,6 +384,16 @@ In the source files where you need to use the library, import the header file:
 At this point your workspace should build without error. If you are having problem, post to the Issue and the
 community can help you solve it.
 
+## Data Collection Practices
+
+From Xcode 15, we provide the new `PrivacyInfo.xcprivacy` file for privacy details, see [Describing data use in privacy manifests](https://developer.apple.com/documentation/bundleresources/privacy_manifest_files/describing_data_use_in_privacy_manifests?language=objc)
+
+You can exports the privacy report after archive your App by integrate SDWebImage via SwiftPM/XCFramework or CocoaPods (`use_frameworks` set to true).
+
+For old version or if you're using static ar archive, as required by the [App privacy details on the App Store](https://developer.apple.com/app-store/app-privacy-details/), here's SDWebImage's list of [Data Collection Practices](https://sdwebimage.github.io/DataCollection/index.html).
+
+
+
 ## Author
 - [Olivier Poitrey](https://github.com/rs)
 
@@ -164,16 +404,43 @@ community can help you solve it.
 - [DreamPiggy](https://github.com/dreampiggy)
 - [Wu Zhong](https://github.com/zhongwuzw)
 
+## Credits
+
+Thank you to all the people who have already contributed to SDWebImage.
+
+[![Contributors](https://opencollective.com/SDWebImage/contributors.svg?width=890)](https://github.com/SDWebImage/SDWebImage/graphs/contributors)
+
 ## Licenses
 
-All source code is licensed under the [MIT License](https://raw.github.com/rs/SDWebImage/master/LICENSE).
+All source code is licensed under the [MIT License](https://github.com/SDWebImage/SDWebImage/blob/master/LICENSE).
 
 ## Architecture
 
+To learn about SDWebImage's architecture design for contribution, read [The Core of SDWebImage v5.6 Architecture](https://github.com/SDWebImage/SDWebImage/wiki/5.6-Code-Architecture-Analysis). Thanks @looseyi for the post and translation.
+
+#### High Level Diagram
+<p align="center" >
+    <img src="https://raw.githubusercontent.com/SDWebImage/SDWebImage/master/Docs/Diagrams/SDWebImageHighLevelDiagram.jpeg" title="SDWebImage high level diagram">
+</p>
+
+#### Overall Class Diagram
 <p align="center" >
-    <img src="Docs/SDWebImageClassDiagram.png" title="SDWebImage class diagram">
+    <img src="https://raw.githubusercontent.com/SDWebImage/SDWebImage/master/Docs/Diagrams/SDWebImageClassDiagram.png" title="SDWebImage overall class diagram">
 </p>
 
+#### Top Level API Diagram
 <p align="center" >
-    <img src="Docs/SDWebImageSequenceDiagram.png" title="SDWebImage sequence diagram">
+    <img src="https://raw.githubusercontent.com/SDWebImage/SDWebImage/master/Docs/Diagrams/SDWebImageTopLevelClassDiagram.png" title="SDWebImage top level API diagram">
 </p>
+
+#### Main Sequence Diagram
+<p align="center" >
+    <img src="https://raw.githubusercontent.com/SDWebImage/SDWebImage/master/Docs/Diagrams/SDWebImageSequenceDiagram.png" title="SDWebImage sequence diagram">
+</p>
+
+#### More detailed diagrams
+- [Manager API Diagram](https://raw.githubusercontent.com/SDWebImage/SDWebImage/master/Docs/Diagrams/SDWebImageManagerClassDiagram.png)
+- [Coders API Diagram](https://raw.githubusercontent.com/SDWebImage/SDWebImage/master/Docs/Diagrams/SDWebImageCodersClassDiagram.png)
+- [Loader API Diagram](https://raw.githubusercontent.com/SDWebImage/SDWebImage/master/Docs/Diagrams/SDWebImageLoaderClassDiagram.png)
+- [Cache API Diagram](https://raw.githubusercontent.com/SDWebImage/SDWebImage/master/Docs/Diagrams/SDWebImageCacheClassDiagram.png)
+
diff --git a/SDWebImage.json b/SDWebImage.json
new file mode 100644
index 000000000..4ce23f3eb
--- /dev/null
+++ b/SDWebImage.json
@@ -0,0 +1,18 @@
+{
+	"5.19.2": "https://github.com/SDWebImage/SDWebImage/releases/download/5.19.2/SDWebImage-dynamic.xcframework.zip",
+	"5.19.3": "https://github.com/SDWebImage/SDWebImage/releases/download/5.19.3/SDWebImage-dynamic.xcframework.zip",
+    "5.19.4": "https://github.com/SDWebImage/SDWebImage/releases/download/5.19.4/SDWebImage-dynamic.xcframework.zip",
+    "5.19.5": "https://github.com/SDWebImage/SDWebImage/releases/download/5.19.5/SDWebImage-dynamic.xcframework.zip",
+    "5.19.6": "https://github.com/SDWebImage/SDWebImage/releases/download/5.19.6/SDWebImage-dynamic.xcframework.zip",
+    "5.19.7": "https://github.com/SDWebImage/SDWebImage/releases/download/5.19.7/SDWebImage-dynamic.xcframework.zip",
+    "5.20.0": "https://github.com/SDWebImage/SDWebImage/releases/download/5.20.0/SDWebImage-dynamic.xcframework.zip",
+    "5.20.1": "https://github.com/SDWebImage/SDWebImage/releases/download/5.20.1/SDWebImage-dynamic.xcframework.zip",
+    "5.21.0": "https://github.com/SDWebImage/SDWebImage/releases/download/5.21.0/SDWebImage-dynamic.xcframework.zip",
+    "5.21.1": "https://github.com/SDWebImage/SDWebImage/releases/download/5.21.1/SDWebImage-dynamic.xcframework.zip",
+    "5.21.2": "https://github.com/SDWebImage/SDWebImage/releases/download/5.21.2/SDWebImage-dynamic.xcframework.zip",
+    "5.21.3": "https://github.com/SDWebImage/SDWebImage/releases/download/5.21.3/SDWebImage-dynamic.xcframework.zip",
+    "5.21.4": "https://github.com/SDWebImage/SDWebImage/releases/download/5.21.4/SDWebImage-dynamic.xcframework.zip",
+    "5.21.5": "https://github.com/SDWebImage/SDWebImage/releases/download/5.21.5/SDWebImage-dynamic.xcframework.zip",
+    "5.21.6": "https://github.com/SDWebImage/SDWebImage/releases/download/5.21.6/SDWebImage-dynamic.xcframework.zip",
+    "5.21.7": "https://github.com/SDWebImage/SDWebImage/releases/download/5.21.7/SDWebImage-dynamic.xcframework.zip"
+}
diff --git a/SDWebImage.podspec b/SDWebImage.podspec
index 8bf1867b6..4e7f1b6c2 100644
--- a/SDWebImage.podspec
+++ b/SDWebImage.podspec
@@ -1,17 +1,18 @@
 Pod::Spec.new do |s|
   s.name = 'SDWebImage'
-  s.version = '4.4.2'
+  s.version = '5.21.7'
 
-  s.osx.deployment_target = '10.9'
-  s.ios.deployment_target = '7.0'
+  s.osx.deployment_target = '10.11'
+  s.ios.deployment_target = '9.0'
   s.tvos.deployment_target = '9.0'
   s.watchos.deployment_target = '2.0'
+  s.visionos.deployment_target = "1.0"
 
   s.license = 'MIT'
   s.summary = 'Asynchronous image downloader with cache support with an UIImageView category.'
-  s.homepage = 'https://github.com/rs/SDWebImage'
+  s.homepage = 'https://github.com/SDWebImage/SDWebImage'
   s.author = { 'Olivier Poitrey' => 'rs@dailymotion.com' }
-  s.source = { :git => 'https://github.com/rs/SDWebImage.git', :tag => s.version.to_s }
+  s.source = { :git => 'https://github.com/SDWebImage/SDWebImage.git', :tag => s.version.to_s }
 
   s.description = 'This library provides a category for UIImageView with support for remote '      \
                   'images coming from the web. It provides an UIImageView category adding web '    \
@@ -26,42 +27,24 @@ Pod::Spec.new do |s|
   
   s.default_subspec = 'Core'
 
+  s.pod_target_xcconfig = {
+    'SUPPORTS_MACCATALYST' => 'YES',
+    'DERIVE_MACCATALYST_PRODUCT_BUNDLE_IDENTIFIER' => 'NO'
+  }
+
   s.subspec 'Core' do |core|
-    core.source_files = 'SDWebImage/{NS,SD,UI}*.{h,m}'
-    core.exclude_files = 'SDWebImage/UIImage+WebP.{h,m}', 'SDWebImage/SDWebImageWebPCoder.{h,m}'
-    core.tvos.exclude_files = 'SDWebImage/MKAnnotationView+WebCache.*'
+    core.source_files = 'SDWebImage/Core/*.{h,m}', 'WebImage/SDWebImage.h', 'SDWebImage/Private/*.{h,m}'
+    core.private_header_files = 'SDWebImage/Private/*.h'
+    core.resource_bundles = {'SDWebImage' => ['WebImage/PrivacyInfo.xcprivacy']}
   end
 
   s.subspec 'MapKit' do |mk|
-    mk.osx.deployment_target = '10.9'
-    mk.ios.deployment_target = '7.0'
+    mk.osx.deployment_target = '10.11'
+    mk.ios.deployment_target = '9.0'
     mk.tvos.deployment_target = '9.0'
-    mk.source_files = 'SDWebImage/MKAnnotationView+WebCache.*'
+    mk.visionos.deployment_target = "1.0"
+    mk.source_files = 'SDWebImageMapKit/MapKit/*.{h,m}'
     mk.framework = 'MapKit'
     mk.dependency 'SDWebImage/Core'
   end
-
-  s.subspec 'GIF' do |gif|
-    gif.ios.deployment_target = '7.0'
-    gif.source_files = 'SDWebImage/FLAnimatedImage/*.{h,m}'
-    gif.dependency 'SDWebImage/Core'
-    gif.dependency 'FLAnimatedImage', '~> 1.0'
-    gif.xcconfig = {
-      'USER_HEADER_SEARCH_PATHS' => '$(inherited) $(SRCROOT)/FLAnimatedImage/FLAnimatedImage'
-    }
-  end
-
-  s.subspec 'WebP' do |webp|
-    webp.source_files = 'SDWebImage/UIImage+WebP.{h,m}', 'SDWebImage/SDWebImageWebPCoder.{h,m}'
-    webp.xcconfig = { 
-      'GCC_PREPROCESSOR_DEFINITIONS' => '$(inherited) SD_WEBP=1',
-      'USER_HEADER_SEARCH_PATHS' => '$(inherited) $(SRCROOT)/libwebp/src'
-    }
-    webp.watchos.xcconfig = {
-      'GCC_PREPROCESSOR_DEFINITIONS' => '$(inherited) SD_WEBP=1 WEBP_USE_INTRINSICS=1',
-      'USER_HEADER_SEARCH_PATHS' => '$(inherited) $(SRCROOT)/libwebp/src'
-    }
-    webp.dependency 'SDWebImage/Core'
-    webp.dependency 'libwebp', '~> 0.5'
-  end
 end
diff --git a/SDWebImage.xcodeproj/project.pbxproj b/SDWebImage.xcodeproj/project.pbxproj
index 158e6699a..696c61388 100644
--- a/SDWebImage.xcodeproj/project.pbxproj
+++ b/SDWebImage.xcodeproj/project.pbxproj
@@ -6,545 +6,257 @@
 	objectVersion = 46;
 	objects = {
 
+/* Begin PBXAggregateTarget section */
+		326CA50C22BA14EF0033A92F /* SDWebImage XCFramework */ = {
+			isa = PBXAggregateTarget;
+			buildConfigurationList = 326CA50F22BA14EF0033A92F /* Build configuration list for PBXAggregateTarget "SDWebImage XCFramework" */;
+			buildPhases = (
+				326CA51322BA1A270033A92F /* Build Frameworks */,
+				326CA51422BA25F70033A92F /* Create XCFramework */,
+				32F4EC0E2BEA18C400EAADD2 /* Sign XCFramework */,
+			);
+			dependencies = (
+			);
+			name = "SDWebImage XCFramework";
+			productName = "SDWebImage XCFramework";
+		};
+/* End PBXAggregateTarget section */
+
 /* Begin PBXBuildFile section */
-		00733A541BC4880000A5A117 /* SDWebImageCompat.m in Sources */ = {isa = PBXBuildFile; fileRef = 5340674F167780C40042B59E /* SDWebImageCompat.m */; };
-		00733A551BC4880000A5A117 /* SDWebImageDownloader.m in Sources */ = {isa = PBXBuildFile; fileRef = 53922D8C148C56230056699D /* SDWebImageDownloader.m */; };
-		00733A561BC4880000A5A117 /* SDWebImageDownloaderOperation.m in Sources */ = {isa = PBXBuildFile; fileRef = 530E49E416460AE2002868E7 /* SDWebImageDownloaderOperation.m */; };
-		00733A571BC4880000A5A117 /* SDImageCache.m in Sources */ = {isa = PBXBuildFile; fileRef = 53922D86148C56230056699D /* SDImageCache.m */; };
-		00733A581BC4880000A5A117 /* SDWebImageManager.m in Sources */ = {isa = PBXBuildFile; fileRef = 53922D8F148C56230056699D /* SDWebImageManager.m */; };
-		00733A5A1BC4880000A5A117 /* SDWebImagePrefetcher.m in Sources */ = {isa = PBXBuildFile; fileRef = 53922D92148C56230056699D /* SDWebImagePrefetcher.m */; };
-		00733A5B1BC4880000A5A117 /* NSData+ImageContentType.m in Sources */ = {isa = PBXBuildFile; fileRef = 5D5B9141188EE8DD006D06BD /* NSData+ImageContentType.m */; };
-		00733A5C1BC4880000A5A117 /* UIButton+WebCache.m in Sources */ = {isa = PBXBuildFile; fileRef = 53922D94148C56230056699D /* UIButton+WebCache.m */; };
-		00733A5D1BC4880000A5A117 /* UIImage+GIF.m in Sources */ = {isa = PBXBuildFile; fileRef = A18A6CC6172DC28500419892 /* UIImage+GIF.m */; };
-		00733A5E1BC4880000A5A117 /* UIImage+MultiFormat.m in Sources */ = {isa = PBXBuildFile; fileRef = 53EDFB8917623F7C00698166 /* UIImage+MultiFormat.m */; };
-		00733A5F1BC4880000A5A117 /* UIImage+WebP.m in Sources */ = {isa = PBXBuildFile; fileRef = 53EDFB921762547C00698166 /* UIImage+WebP.m */; };
-		00733A601BC4880000A5A117 /* UIImageView+HighlightedWebCache.m in Sources */ = {isa = PBXBuildFile; fileRef = ABBE71A618C43B4D00B75E91 /* UIImageView+HighlightedWebCache.m */; };
-		00733A611BC4880000A5A117 /* UIImageView+WebCache.m in Sources */ = {isa = PBXBuildFile; fileRef = 53922D96148C56230056699D /* UIImageView+WebCache.m */; };
-		00733A621BC4880000A5A117 /* UIView+WebCacheOperation.m in Sources */ = {isa = PBXBuildFile; fileRef = AB615302192DA24600A2D8E9 /* UIView+WebCacheOperation.m */; };
-		00733A631BC4880E00A5A117 /* SDWebImageCompat.h in Headers */ = {isa = PBXBuildFile; fileRef = 53922D88148C56230056699D /* SDWebImageCompat.h */; settings = {ATTRIBUTES = (Public, ); }; };
-		00733A641BC4880E00A5A117 /* SDWebImageOperation.h in Headers */ = {isa = PBXBuildFile; fileRef = 530E49E71646388E002868E7 /* SDWebImageOperation.h */; settings = {ATTRIBUTES = (Public, ); }; };
-		00733A651BC4880E00A5A117 /* SDWebImageDownloader.h in Headers */ = {isa = PBXBuildFile; fileRef = 53922D8B148C56230056699D /* SDWebImageDownloader.h */; settings = {ATTRIBUTES = (Public, ); }; };
-		00733A661BC4880E00A5A117 /* SDWebImageDownloaderOperation.h in Headers */ = {isa = PBXBuildFile; fileRef = 530E49E316460AE2002868E7 /* SDWebImageDownloaderOperation.h */; settings = {ATTRIBUTES = (Public, ); }; };
-		00733A671BC4880E00A5A117 /* SDImageCache.h in Headers */ = {isa = PBXBuildFile; fileRef = 53922D85148C56230056699D /* SDImageCache.h */; settings = {ATTRIBUTES = (Public, ); }; };
-		00733A681BC4880E00A5A117 /* SDWebImageManager.h in Headers */ = {isa = PBXBuildFile; fileRef = 53922D8E148C56230056699D /* SDWebImageManager.h */; settings = {ATTRIBUTES = (Public, ); }; };
-		00733A6A1BC4880E00A5A117 /* SDWebImagePrefetcher.h in Headers */ = {isa = PBXBuildFile; fileRef = 53922D91148C56230056699D /* SDWebImagePrefetcher.h */; settings = {ATTRIBUTES = (Public, ); }; };
-		00733A6B1BC4880E00A5A117 /* NSData+ImageContentType.h in Headers */ = {isa = PBXBuildFile; fileRef = 5D5B9140188EE8DD006D06BD /* NSData+ImageContentType.h */; settings = {ATTRIBUTES = (Public, ); }; };
-		00733A6C1BC4880E00A5A117 /* UIButton+WebCache.h in Headers */ = {isa = PBXBuildFile; fileRef = 53922D93148C56230056699D /* UIButton+WebCache.h */; settings = {ATTRIBUTES = (Public, ); }; };
-		00733A6D1BC4880E00A5A117 /* UIImage+GIF.h in Headers */ = {isa = PBXBuildFile; fileRef = A18A6CC5172DC28500419892 /* UIImage+GIF.h */; settings = {ATTRIBUTES = (Public, ); }; };
-		00733A6E1BC4880E00A5A117 /* UIImage+MultiFormat.h in Headers */ = {isa = PBXBuildFile; fileRef = 53EDFB8817623F7C00698166 /* UIImage+MultiFormat.h */; settings = {ATTRIBUTES = (Public, ); }; };
-		00733A6F1BC4880E00A5A117 /* UIImage+WebP.h in Headers */ = {isa = PBXBuildFile; fileRef = 53EDFB911762547C00698166 /* UIImage+WebP.h */; settings = {ATTRIBUTES = (Public, ); }; };
-		00733A701BC4880E00A5A117 /* UIImageView+HighlightedWebCache.h in Headers */ = {isa = PBXBuildFile; fileRef = ABBE71A518C43B4D00B75E91 /* UIImageView+HighlightedWebCache.h */; settings = {ATTRIBUTES = (Public, ); }; };
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-				4314D1601D0E0E3B004B36C9 /* CoreGraphics.framework in Frameworks */,
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-		431BB6CA1D06D2C1006A3455 /* Frameworks */ = {
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-			files = (
-			);
-			runOnlyForDeploymentPostprocessing = 0;
-		};
-		4397D2B81D0DDD8C00BB2784 /* Frameworks */ = {
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 			buildActionMask = 2147483647;
 			files = (
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
-		4A2CADFB1AB4BB5300B6BC39 /* Frameworks */ = {
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 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				53761312155AD0D5005750A4 /* UIKit.framework in Frameworks */,
+				53761313155AD0D5005750A4 /* Foundation.framework in Frameworks */,
+				53761314155AD0D5005750A4 /* CoreGraphics.framework in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
-		53761311155AD0D5005750A4 /* Frameworks */ = {
+		80B6DFB72142B71600BCB334 /* Frameworks */ = {
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 			buildActionMask = 2147483647;
 			files = (
-				53761312155AD0D5005750A4 /* UIKit.framework in Frameworks */,
-				53761313155AD0D5005750A4 /* Foundation.framework in Frameworks */,
-				53761314155AD0D5005750A4 /* CoreGraphics.framework in Frameworks */,
+				806BE07C2142C4A200E02143 /* SDWebImage.framework in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -1576,139 +595,158 @@
 		321E60831F38E88F00405457 /* Decoder */ = {
 			isa = PBXGroup;
 			children = (
-				807A12261F89636300EC2A9B /* SDWebImageCodersManager.h */,
-				807A12271F89636300EC2A9B /* SDWebImageCodersManager.m */,
-				321E60841F38E8C800405457 /* SDWebImageCoder.h */,
-				321E60851F38E8C800405457 /* SDWebImageCoder.m */,
-				321E60921F38E8ED00405457 /* SDWebImageImageIOCoder.h */,
-				321E60931F38E8ED00405457 /* SDWebImageImageIOCoder.m */,
-				321E60A01F38E8F600405457 /* SDWebImageGIFCoder.h */,
-				321E60A11F38E8F600405457 /* SDWebImageGIFCoder.m */,
-				321E60AE1F38E90100405457 /* SDWebImageWebPCoder.h */,
-				321E60AF1F38E90100405457 /* SDWebImageWebPCoder.m */,
-				3290FA021FA478AF0047D20C /* SDWebImageFrame.h */,
-				3290FA031FA478AF0047D20C /* SDWebImageFrame.m */,
-				32CF1C051FA496B000004BD1 /* SDWebImageCoderHelper.h */,
-				32CF1C061FA496B000004BD1 /* SDWebImageCoderHelper.m */,
-				320224B9203979BA00E9F285 /* SDAnimatedImageRep.h */,
-				320224BA203979BA00E9F285 /* SDAnimatedImageRep.m */,
+				807A12261F89636300EC2A9B /* SDImageCodersManager.h */,
+				807A12271F89636300EC2A9B /* SDImageCodersManager.m */,
+				321E60841F38E8C800405457 /* SDImageCoder.h */,
+				321E60851F38E8C800405457 /* SDImageCoder.m */,
+				321E60921F38E8ED00405457 /* SDImageIOCoder.h */,
+				321E60931F38E8ED00405457 /* SDImageIOCoder.m */,
+				32A09E3D233358B700339F9D /* SDImageIOAnimatedCoder.h */,
+				32A09E3E233358B700339F9D /* SDImageIOAnimatedCoder.m */,
+				321E60A01F38E8F600405457 /* SDImageGIFCoder.h */,
+				321E60A11F38E8F600405457 /* SDImageGIFCoder.m */,
+				327054D2206CD8B3006EA328 /* SDImageAPNGCoder.h */,
+				327054D3206CD8B3006EA328 /* SDImageAPNGCoder.m */,
+				3298655A2337230C0071958B /* SDImageHEICCoder.h */,
+				3298655B2337230C0071958B /* SDImageHEICCoder.m */,
+				3263626C24AEEEB0008FB119 /* SDImageAWebPCoder.h */,
+				3263626D24AEEEB0008FB119 /* SDImageAWebPCoder.m */,
+				3290FA021FA478AF0047D20C /* SDImageFrame.h */,
+				3290FA031FA478AF0047D20C /* SDImageFrame.m */,
+				32CF1C051FA496B000004BD1 /* SDImageCoderHelper.h */,
+				32CF1C061FA496B000004BD1 /* SDImageCoderHelper.m */,
+				3257EAF721898AED0097B271 /* SDImageGraphics.h */,
+				3257EAF821898AED0097B271 /* SDImageGraphics.m */,
+				3246A70123A567AC00FBEA10 /* SDGraphicsImageRenderer.h */,
+				3246A70223A567AC00FBEA10 /* SDGraphicsImageRenderer.m */,
 			);
 			name = Decoder;
 			sourceTree = "<group>";
 		};
-		323F8B121F38EF770092B609 /* enc */ = {
+		32484756201775CE00AF9E5A /* AnimatedImage */ = {
 			isa = PBXGroup;
 			children = (
-				323F8B131F38EF770092B609 /* alpha_enc.c */,
-				323F8B141F38EF770092B609 /* analysis_enc.c */,
-				323F8B151F38EF770092B609 /* backward_references_enc.c */,
-				323F8B161F38EF770092B609 /* backward_references_enc.h */,
-				323F8B171F38EF770092B609 /* config_enc.c */,
-				323F8B181F38EF770092B609 /* cost_enc.c */,
-				323F8B191F38EF770092B609 /* cost_enc.h */,
-				323F8B1A1F38EF770092B609 /* delta_palettization_enc.c */,
-				323F8B1B1F38EF770092B609 /* delta_palettization_enc.h */,
-				323F8B1C1F38EF770092B609 /* filter_enc.c */,
-				323F8B1D1F38EF770092B609 /* frame_enc.c */,
-				323F8B1E1F38EF770092B609 /* histogram_enc.c */,
-				323F8B1F1F38EF770092B609 /* histogram_enc.h */,
-				323F8B201F38EF770092B609 /* iterator_enc.c */,
-				323F8B221F38EF770092B609 /* near_lossless_enc.c */,
-				323F8B231F38EF770092B609 /* picture_csp_enc.c */,
-				323F8B241F38EF770092B609 /* picture_enc.c */,
-				323F8B251F38EF770092B609 /* picture_psnr_enc.c */,
-				323F8B261F38EF770092B609 /* picture_rescale_enc.c */,
-				323F8B271F38EF770092B609 /* picture_tools_enc.c */,
-				323F8B281F38EF770092B609 /* predictor_enc.c */,
-				323F8B291F38EF770092B609 /* quant_enc.c */,
-				323F8B2A1F38EF770092B609 /* syntax_enc.c */,
-				323F8B2B1F38EF770092B609 /* token_enc.c */,
-				323F8B2C1F38EF770092B609 /* tree_enc.c */,
-				323F8B2D1F38EF770092B609 /* vp8i_enc.h */,
-				323F8B2E1F38EF770092B609 /* vp8l_enc.c */,
-				323F8B2F1F38EF770092B609 /* vp8li_enc.h */,
-				323F8B301F38EF770092B609 /* webp_enc.c */,
-			);
-			path = enc;
+				3248475B201775F600AF9E5A /* SDAnimatedImage.h */,
+				3248475A201775F600AF9E5A /* SDAnimatedImage.m */,
+				32484759201775F600AF9E5A /* SDAnimatedImageView.h */,
+				32484757201775F600AF9E5A /* SDAnimatedImageView.m */,
+				32484758201775F600AF9E5A /* SDAnimatedImageView+WebCache.h */,
+				3248475C201775F600AF9E5A /* SDAnimatedImageView+WebCache.m */,
+				320224B9203979BA00E9F285 /* SDAnimatedImageRep.h */,
+				320224BA203979BA00E9F285 /* SDAnimatedImageRep.m */,
+				326E2F2C236F0B23006F847F /* SDAnimatedImagePlayer.h */,
+				326E2F2D236F0B23006F847F /* SDAnimatedImagePlayer.m */,
+			);
+			name = AnimatedImage;
 			sourceTree = "<group>";
 		};
-		323F8B311F38EF770092B609 /* mux */ = {
+		3287E6C7244C0C1400007311 /* SDWebImageMapKit */ = {
 			isa = PBXGroup;
 			children = (
-				323F8B321F38EF770092B609 /* anim_encode.c */,
-				323F8B331F38EF770092B609 /* animi.h */,
-				323F8B3A1F38EF770092B609 /* muxedit.c */,
-				323F8B3B1F38EF770092B609 /* muxi.h */,
-				323F8B3C1F38EF770092B609 /* muxinternal.c */,
-				323F8B3D1F38EF770092B609 /* muxread.c */,
-			);
-			path = mux;
+				3287E6CC244C0C1400007311 /* MapKit */,
+			);
+			path = SDWebImageMapKit;
 			sourceTree = "<group>";
 		};
-		4369C2851D9811BB007E863A /* WebCache Categories */ = {
+		3287E6CC244C0C1400007311 /* MapKit */ = {
 			isa = PBXGroup;
 			children = (
-				4397D2F41D0DE2DF00BB2784 /* NSImage+WebCache.h */,
-				4397D2F51D0DE2DF00BB2784 /* NSImage+WebCache.m */,
-				321DB35F2011D4D60015D2CB /* NSButton+WebCache.h */,
-				321DB3602011D4D60015D2CB /* NSButton+WebCache.m */,
-				535699B415113E7300A4C397 /* MKAnnotationView+WebCache.h */,
-				535699B515113E7300A4C397 /* MKAnnotationView+WebCache.m */,
-				53922D93148C56230056699D /* UIButton+WebCache.h */,
-				53922D94148C56230056699D /* UIButton+WebCache.m */,
-				ABBE71A518C43B4D00B75E91 /* UIImageView+HighlightedWebCache.h */,
-				ABBE71A618C43B4D00B75E91 /* UIImageView+HighlightedWebCache.m */,
-				53922D95148C56230056699D /* UIImageView+WebCache.h */,
-				53922D96148C56230056699D /* UIImageView+WebCache.m */,
-				4369C2751D9807EC007E863A /* UIView+WebCache.h */,
-				4369C2761D9807EC007E863A /* UIView+WebCache.m */,
+				3287E6CE244C0C1400007311 /* MKAnnotationView+WebCache.h */,
+				3287E6CD244C0C1400007311 /* MKAnnotationView+WebCache.m */,
 			);
-			name = "WebCache Categories";
-			path = ..;
+			path = MapKit;
 			sourceTree = "<group>";
 		};
-		43C892971D9D6DBB0022038D /* demux */ = {
+		328BB6972081FDAB00760D6C /* Manager */ = {
 			isa = PBXGroup;
 			children = (
-				43C892981D9D6DD70022038D /* anim_decode.c */,
-				43C892991D9D6DD70022038D /* demux.c */,
-			);
-			path = demux;
+				53922D8E148C56230056699D /* SDWebImageManager.h */,
+				53922D8F148C56230056699D /* SDWebImageManager.m */,
+				328BB69A2081FED200760D6C /* SDWebImageCacheKeyFilter.h */,
+				328BB69B2081FED200760D6C /* SDWebImageCacheKeyFilter.m */,
+				328BB6A82081FEE500760D6C /* SDWebImageCacheSerializer.h */,
+				328BB6A92081FEE500760D6C /* SDWebImageCacheSerializer.m */,
+				324406292296C5F400A36084 /* SDWebImageOptionsProcessor.h */,
+				3244062A2296C5F400A36084 /* SDWebImageOptionsProcessor.m */,
+			);
+			name = Manager;
 			sourceTree = "<group>";
 		};
-		43CE75451CFE9427006C64D0 /* FLAnimatedImage */ = {
+		328BB6982081FDD800760D6C /* Prefetcher */ = {
 			isa = PBXGroup;
 			children = (
-				43CE75481CFE9427006C64D0 /* FLAnimatedImage */,
+				53922D91148C56230056699D /* SDWebImagePrefetcher.h */,
+				53922D92148C56230056699D /* SDWebImagePrefetcher.m */,
 			);
-			name = FLAnimatedImage;
-			path = Vendors/FLAnimatedImage;
+			name = Prefetcher;
 			sourceTree = "<group>";
 		};
-		43CE75481CFE9427006C64D0 /* FLAnimatedImage */ = {
+		328BB6992081FDDF00760D6C /* Transformer */ = {
 			isa = PBXGroup;
 			children = (
-				43CE75491CFE9427006C64D0 /* FLAnimatedImage.h */,
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-				43CE754B1CFE9427006C64D0 /* FLAnimatedImageView.h */,
-				43CE754C1CFE9427006C64D0 /* FLAnimatedImageView.m */,
+				32F7C06D2030114C00873181 /* SDImageTransformer.h */,
+				32F7C06E2030114C00873181 /* SDImageTransformer.m */,
 			);
-			path = FLAnimatedImage;
+			name = Transformer;
 			sourceTree = "<group>";
 		};
-		43CE75CD1CFE98B3006C64D0 /* FLAnimatedImage */ = {
+		32B5CC5D222F89C2005EB74E /* Private */ = {
 			isa = PBXGroup;
 			children = (
-				43CE75CE1CFE98E0006C64D0 /* FLAnimatedImageView+WebCache.h */,
-				43CE75CF1CFE98E0006C64D0 /* FLAnimatedImageView+WebCache.m */,
+				32B5CC5E222F89C2005EB74E /* SDAsyncBlockOperation.h */,
+				32B5CC5F222F89C2005EB74E /* SDAsyncBlockOperation.m */,
+				3240BB6623968FE6003BA07D /* SDAssociatedObject.h */,
+				3240BB6723968FE6003BA07D /* SDAssociatedObject.m */,
+				325C460622339426004CAE11 /* SDWeakProxy.h */,
+				325C460722339426004CAE11 /* SDWeakProxy.m */,
+				32E6730F235765B500DB4987 /* SDDisplayLink.h */,
+				32E67310235765B500DB4987 /* SDDisplayLink.m */,
+				326E2F31236F1D58006F847F /* SDDeviceHelper.h */,
+				326E2F32236F1D58006F847F /* SDDeviceHelper.m */,
+				325C460022339330004CAE11 /* SDImageAssetManager.h */,
+				325C460122339330004CAE11 /* SDImageAssetManager.m */,
+				325C460C223394D8004CAE11 /* SDImageCachesManagerOperation.h */,
+				325C460D223394D8004CAE11 /* SDImageCachesManagerOperation.m */,
+				3237321229F8D0D600D1DA41 /* SDImageFramePool.h */,
+				3237321329F8D0D600D1DA41 /* SDImageFramePool.m */,
+				32C78E39233371AD00C6B7F8 /* SDImageIOAnimatedCoderInternal.h */,
+				3253F235244982D3006C2BE8 /* SDWebImageTransitionInternal.h */,
+				325C461E2233A02E004CAE11 /* UIColor+SDHexString.h */,
+				325C461F2233A02E004CAE11 /* UIColor+SDHexString.m */,
+				325C46242233A0A8004CAE11 /* NSBezierPath+SDRoundedCorners.h */,
+				325C46252233A0A8004CAE11 /* NSBezierPath+SDRoundedCorners.m */,
+				325F7CC423893B2E00AEDFCC /* SDFileAttributeHelper.h */,
+				325F7CC523893B2E00AEDFCC /* SDFileAttributeHelper.m */,
+				329F123F223FAD3400B309FD /* SDInternalMacros.h */,
+				329F123E223FAD3400B309FD /* SDInternalMacros.m */,
+				329F1235223FAA3B00B309FD /* SDmetamacros.h */,
+			);
+			path = Private;
+			sourceTree = "<group>";
+		};
+		4369C2851D9811BB007E863A /* WebCache Categories */ = {
+			isa = PBXGroup;
+			children = (
+				321DB35F2011D4D60015D2CB /* NSButton+WebCache.h */,
+				321DB3602011D4D60015D2CB /* NSButton+WebCache.m */,
+				53922D93148C56230056699D /* UIButton+WebCache.h */,
+				53922D94148C56230056699D /* UIButton+WebCache.m */,
+				ABBE71A518C43B4D00B75E91 /* UIImageView+HighlightedWebCache.h */,
+				ABBE71A618C43B4D00B75E91 /* UIImageView+HighlightedWebCache.m */,
+				53922D95148C56230056699D /* UIImageView+WebCache.h */,
+				53922D96148C56230056699D /* UIImageView+WebCache.m */,
+				4369C2751D9807EC007E863A /* UIView+WebCache.h */,
+				4369C2761D9807EC007E863A /* UIView+WebCache.m */,
 			);
-			path = FLAnimatedImage;
+			name = "WebCache Categories";
+			path = ..;
 			sourceTree = "<group>";
 		};
 		4A2CAE001AB4BB5300B6BC39 /* WebImage */ = {
 			isa = PBXGroup;
 			children = (
 				4A2CAE031AB4BB5400B6BC39 /* SDWebImage.h */,
+				806BE07D2142C65200E02143 /* SDWebImageMapKit.h */,
 				4A2CAE011AB4BB5400B6BC39 /* Supporting Files */,
 			);
 			path = WebImage;
@@ -1717,6 +755,7 @@
 		4A2CAE011AB4BB5400B6BC39 /* Supporting Files */ = {
 			isa = PBXGroup;
 			children = (
+				3286569B2AB045DC00E0BDB7 /* PrivacyInfo.xcprivacy */,
 				4A2CAE021AB4BB5400B6BC39 /* Info.plist */,
 			);
 			name = "Supporting Files";
@@ -1725,7 +764,9 @@
 		53922D64148C55810056699D = {
 			isa = PBXGroup;
 			children = (
+				EA9E0C6A2195936400AFB434 /* Configs */,
 				53922D74148C55820056699D /* SDWebImage */,
+				3287E6C7244C0C1400007311 /* SDWebImageMapKit */,
 				4A2CAE001AB4BB5300B6BC39 /* WebImage */,
 				53922D71148C55820056699D /* Frameworks */,
 				53922D70148C55820056699D /* Products */,
@@ -1736,12 +777,9 @@
 		53922D70148C55820056699D /* Products */ = {
 			isa = PBXGroup;
 			children = (
-				53761325155AD0D5005750A4 /* libSDWebImage iOS static.a */,
+				53761325155AD0D5005750A4 /* libSDWebImage.a */,
 				4A2CADFF1AB4BB5300B6BC39 /* SDWebImage.framework */,
-				00733A4C1BC487C000A5A117 /* SDWebImage.framework */,
-				431BB7031D06D2C1006A3455 /* SDWebImage.framework */,
-				4397D2F21D0DDD8C00BB2784 /* SDWebImage.framework */,
-				4314D1991D0E0E3B004B36C9 /* libSDWebImage watchOS static.a */,
+				80B6DFEE2142B71600BCB334 /* SDWebImageMapKit.framework */,
 			);
 			name = Products;
 			sourceTree = "<group>";
@@ -1749,8 +787,7 @@
 		53922D71148C55820056699D /* Frameworks */ = {
 			isa = PBXGroup;
 			children = (
-				43CE75451CFE9427006C64D0 /* FLAnimatedImage */,
-				DA577C121998E60B007367ED /* libwebp */,
+				80B6DFF12142B77E00BCB334 /* MapKit.framework */,
 				53FB893F14D35D1A0020B787 /* CoreGraphics.framework */,
 				53922D72148C55820056699D /* Foundation.framework */,
 				53FB894814D35E9E0020B787 /* UIKit.framework */,
@@ -1761,16 +798,17 @@
 		53922D74148C55820056699D /* SDWebImage */ = {
 			isa = PBXGroup;
 			children = (
-				53922D88148C56230056699D /* SDWebImageCompat.h */,
-				5340674F167780C40042B59E /* SDWebImageCompat.m */,
-				530E49E71646388E002868E7 /* SDWebImageOperation.h */,
+				328BB6972081FDAB00760D6C /* Manager */,
 				53922DAB148C56810056699D /* Downloader */,
 				53922DAA148C56470056699D /* Cache */,
 				321E60831F38E88F00405457 /* Decoder */,
+				328BB6982081FDD800760D6C /* Prefetcher */,
+				328BB6992081FDDF00760D6C /* Transformer */,
+				32484756201775CE00AF9E5A /* AnimatedImage */,
 				53922DAC148C56DD0056699D /* Utils */,
 				53922DA9148C562D0056699D /* Categories */,
 				4369C2851D9811BB007E863A /* WebCache Categories */,
-				43CE75CD1CFE98B3006C64D0 /* FLAnimatedImage */,
+				32B5CC5D222F89C2005EB74E /* Private */,
 			);
 			path = SDWebImage;
 			sourceTree = "<group>";
@@ -1780,16 +818,26 @@
 			children = (
 				5D5B9140188EE8DD006D06BD /* NSData+ImageContentType.h */,
 				5D5B9141188EE8DD006D06BD /* NSData+ImageContentType.m */,
+				325F7CC8238942AB00AEDFCC /* UIImage+ExtendedCacheData.h */,
+				325F7CC9238942AB00AEDFCC /* UIImage+ExtendedCacheData.m */,
 				A18A6CC5172DC28500419892 /* UIImage+GIF.h */,
 				A18A6CC6172DC28500419892 /* UIImage+GIF.m */,
+				329A18571FFF5DFD008C9A2F /* UIImage+Metadata.h */,
+				329A18581FFF5DFD008C9A2F /* UIImage+Metadata.m */,
 				53EDFB8817623F7C00698166 /* UIImage+MultiFormat.h */,
 				53EDFB8917623F7C00698166 /* UIImage+MultiFormat.m */,
-				53EDFB911762547C00698166 /* UIImage+WebP.h */,
-				53EDFB921762547C00698166 /* UIImage+WebP.m */,
 				321E60BC1F38E91700405457 /* UIImage+ForceDecode.h */,
 				321E60BD1F38E91700405457 /* UIImage+ForceDecode.m */,
+				32F7C07D2030719600873181 /* UIImage+Transform.h */,
+				32F7C07C2030719600873181 /* UIImage+Transform.m */,
+				32D3CDCD21DDE87300C4DB49 /* UIImage+MemoryCacheCost.h */,
+				32D3CDCC21DDE87300C4DB49 /* UIImage+MemoryCacheCost.m */,
+				4397D2F41D0DE2DF00BB2784 /* NSImage+Compatibility.h */,
+				4397D2F51D0DE2DF00BB2784 /* NSImage+Compatibility.m */,
 				AB615301192DA24600A2D8E9 /* UIView+WebCacheOperation.h */,
 				AB615302192DA24600A2D8E9 /* UIView+WebCacheOperation.m */,
+				320797422A76287D00B17CF5 /* UIView+WebCacheState.h */,
+				320797432A76287D00B17CF5 /* UIView+WebCacheState.m */,
 			);
 			name = Categories;
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@@ -1801,6 +849,14 @@
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 				43A918621D8308FE00B3925F /* SDImageCacheConfig.h */,
 				43A918631D8308FE00B3925F /* SDImageCacheConfig.m */,
+				328BB6BF2082581100760D6C /* SDMemoryCache.h */,
+				328BB6C02082581100760D6C /* SDMemoryCache.m */,
+				328BB6BD2082581100760D6C /* SDDiskCache.h */,
+				328BB6BE2082581100760D6C /* SDDiskCache.m */,
+				32D1221A2080B2EB003685A3 /* SDImageCacheDefine.h */,
+				32D1221B2080B2EB003685A3 /* SDImageCacheDefine.m */,
+				32D1221D2080B2EB003685A3 /* SDImageCachesManager.h */,
+				32D1221C2080B2EB003685A3 /* SDImageCachesManager.m */,
 			);
 			name = Cache;
 			sourceTree = "<group>";
@@ -1812,6 +868,18 @@
 				53922D8C148C56230056699D /* SDWebImageDownloader.m */,
 				530E49E316460AE2002868E7 /* SDWebImageDownloaderOperation.h */,
 				530E49E416460AE2002868E7 /* SDWebImageDownloaderOperation.m */,
+				32B9B535206ED4230026769D /* SDWebImageDownloaderConfig.h */,
+				32B9B536206ED4230026769D /* SDWebImageDownloaderConfig.m */,
+				32F21B4F20788D8C0036B1D5 /* SDWebImageDownloaderRequestModifier.h */,
+				32F21B5020788D8C0036B1D5 /* SDWebImageDownloaderRequestModifier.m */,
+				32542761235576E20042BAA4 /* SDWebImageDownloaderResponseModifier.h */,
+				32542762235576E20042BAA4 /* SDWebImageDownloaderResponseModifier.m */,
+				3250C9EC2355D9DA0093A896 /* SDWebImageDownloaderDecryptor.h */,
+				3250C9ED2355D9DA0093A896 /* SDWebImageDownloaderDecryptor.m */,
+				321B377D2083290D00C0EA77 /* SDImageLoader.h */,
+				321B377E2083290D00C0EA77 /* SDImageLoader.m */,
+				321B377F2083290E00C0EA77 /* SDImageLoadersManager.h */,
+				321B37802083290E00C0EA77 /* SDImageLoadersManager.m */,
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@@ -1819,786 +887,198 @@
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-				53922D92148C56230056699D /* SDWebImagePrefetcher.m */,
+				53922D88148C56230056699D /* SDWebImageCompat.h */,
+				5340674F167780C40042B59E /* SDWebImageCompat.m */,
+				320CAE132086F50500CFFC80 /* SDWebImageError.h */,
+				320CAE142086F50500CFFC80 /* SDWebImageError.m */,
+				530E49E71646388E002868E7 /* SDWebImageOperation.h */,
+				327F2E82245AE1650075F846 /* SDWebImageOperation.m */,
+				324DF4B2200A14DC008A84CC /* SDWebImageDefine.h */,
+				324DF4B3200A14DC008A84CC /* SDWebImageDefine.m */,
 				325312C6200F09910046BF1E /* SDWebImageTransition.h */,
 				325312C7200F09910046BF1E /* SDWebImageTransition.m */,
+				32C0FDDF2013426C001B8F2D /* SDWebImageIndicator.h */,
+				32C0FDE02013426C001B8F2D /* SDWebImageIndicator.m */,
+				321117A7296573680001FC2C /* SDCallbackQueue.h */,
+				321117A8296573680001FC2C /* SDCallbackQueue.m */,
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 			name = Utils;
 			sourceTree = "<group>";
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-		DA577C121998E60B007367ED /* libwebp */ = {
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+				EA9E0C702195936400AFB434 /* Module-Shared.xcconfig */,
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-				80377CA21F2F66A100F89830 /* dec_clip_tables.c */,
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-				80377CA41F2F66A100F89830 /* dec_mips32.c */,
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+			path = Configs;
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-				GCC_NO_COMMON_BLOCKS = YES;
-				GCC_PREPROCESSOR_DEFINITIONS = (
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 			};
 			name = Release;
 		};
-		4397D2F01D0DDD8C00BB2784 /* Debug */ = {
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-				SDKROOT = macosx;
 			};
 			name = Debug;
 		};
-		4397D2F11D0DDD8C00BB2784 /* Release */ = {
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-				SDKROOT = macosx;
 			};
 			name = Release;
 		};
-		4A2CAE131AB4BB5400B6BC39 /* Debug */ = {
+		53761323155AD0D5005750A4 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				APPLICATION_EXTENSION_API_ONLY = YES;
-				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
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-				DYLIB_COMPATIBILITY_VERSION = 1;
-				DYLIB_CURRENT_VERSION = 1;
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-				MTL_ENABLE_DEBUG_INFO = YES;
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 				PRODUCT_NAME = SDWebImage;
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-				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
 		};
-		4A2CAE141AB4BB5400B6BC39 /* Release */ = {
+		53761324155AD0D5005750A4 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				APPLICATION_EXTENSION_API_ONLY = YES;
-				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
-				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
-				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "";
-				DEFINES_MODULE = YES;
-				DYLIB_COMPATIBILITY_VERSION = 1;
-				DYLIB_CURRENT_VERSION = 1;
-				DYLIB_INSTALL_NAME_BASE = "@rpath";
-				ENABLE_NS_ASSERTIONS = NO;
-				ENABLE_STRICT_OBJC_MSGSEND = YES;
-				INFOPLIST_FILE = WebImage/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
-				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
-				MTL_ENABLE_DEBUG_INFO = NO;
-				PRODUCT_BUNDLE_IDENTIFIER = "com.dailymotion.$(PRODUCT_NAME:rfc1034identifier).ios";
 				PRODUCT_NAME = SDWebImage;
-				SDKROOT = iphoneos;
-				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;
 		};
-		53761323155AD0D5005750A4 /* Debug */ = {
+		53922D7A148C55820056699D /* Debug */ = {
 			isa = XCBuildConfiguration;
+			baseConfigurationReference = EA9E0C6E2195936400AFB434 /* Module-Debug.xcconfig */;
 			buildSettings = {
-				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
-				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
-				GCC_PREPROCESSOR_DEFINITIONS = "$(inherited)";
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
-				PRODUCT_NAME = "$(TARGET_NAME)";
-				PUBLIC_HEADERS_FOLDER_PATH = include/SDWebImage;
-				SDKROOT = iphoneos;
-				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
 		};
-		53761324155AD0D5005750A4 /* Release */ = {
+		53922D7B148C55820056699D /* Release */ = {
 			isa = XCBuildConfiguration;
+			baseConfigurationReference = EA9E0C6B2195936400AFB434 /* Module-Release.xcconfig */;
 			buildSettings = {
-				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
-				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
-				PRODUCT_NAME = "$(TARGET_NAME)";
-				PUBLIC_HEADERS_FOLDER_PATH = include/SDWebImage;
-				SDKROOT = iphoneos;
-				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;
 		};
-		53922D7A148C55820056699D /* Debug */ = {
+		80B6DFEC2142B71600BCB334 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				ALWAYS_SEARCH_USER_PATHS = NO;
-				CLANG_ANALYZER_NONNULL = YES;
-				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
-				CLANG_CXX_LIBRARY = "libc++";
-				CLANG_ENABLE_MODULES = YES;
-				CLANG_ENABLE_OBJC_ARC = YES;
-				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
-				CLANG_WARN_BOOL_CONVERSION = YES;
-				CLANG_WARN_COMMA = YES;
-				CLANG_WARN_CONSTANT_CONVERSION = YES;
-				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
-				CLANG_WARN_EMPTY_BODY = YES;
-				CLANG_WARN_ENUM_CONVERSION = YES;
-				CLANG_WARN_INFINITE_RECURSION = YES;
-				CLANG_WARN_INT_CONVERSION = YES;
-				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
-				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
-				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
-				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
-				CLANG_WARN_STRICT_PROTOTYPES = YES;
-				CLANG_WARN_SUSPICIOUS_MOVE = YES;
-				CLANG_WARN_UNREACHABLE_CODE = NO;
-				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
-				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
-				COPY_PHASE_STRIP = NO;
-				CURRENT_PROJECT_VERSION = 1;
-				ENABLE_STRICT_OBJC_MSGSEND = YES;
-				ENABLE_TESTABILITY = YES;
-				FRAMEWORK_SEARCH_PATHS = (
-					"$(inherited)",
-					"\"$(SRCROOT)\"",
-				);
-				GCC_C_LANGUAGE_STANDARD = gnu99;
-				GCC_DYNAMIC_NO_PIC = NO;
-				GCC_NO_COMMON_BLOCKS = YES;
-				GCC_OPTIMIZATION_LEVEL = 0;
-				GCC_PREPROCESSOR_DEFINITIONS = (
-					"DEBUG=1",
-					"SD_WEBP=1",
-					"$(inherited)",
-				);
-				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
-				GCC_TREAT_WARNINGS_AS_ERRORS = NO;
-				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
-				GCC_WARN_ABOUT_MISSING_FIELD_INITIALIZERS = YES;
-				GCC_WARN_ABOUT_MISSING_NEWLINE = YES;
-				GCC_WARN_ABOUT_MISSING_PROTOTYPES = YES;
-				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
-				GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES;
-				GCC_WARN_SHADOW = YES;
-				GCC_WARN_SIGN_COMPARE = YES;
-				GCC_WARN_UNDECLARED_SELECTOR = YES;
-				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
-				GCC_WARN_UNUSED_FUNCTION = YES;
-				GCC_WARN_UNUSED_LABEL = YES;
-				GCC_WARN_UNUSED_PARAMETER = NO;
-				GCC_WARN_UNUSED_VARIABLE = YES;
-				HEADER_SEARCH_PATHS = Vendors/libwebp/src;
-				ONLY_ACTIVE_ARCH = YES;
-				OTHER_LDFLAGS = "-ObjC";
-				RUN_CLANG_STATIC_ANALYZER = YES;
-				SKIP_INSTALL = YES;
+				INFOPLIST_FILE = WebImage/Info.plist;
 			};
 			name = Debug;
 		};
-		53922D7B148C55820056699D /* Release */ = {
+		80B6DFED2142B71600BCB334 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				ALWAYS_SEARCH_USER_PATHS = NO;
-				CLANG_ANALYZER_NONNULL = YES;
-				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
-				CLANG_CXX_LIBRARY = "libc++";
-				CLANG_ENABLE_MODULES = YES;
-				CLANG_ENABLE_OBJC_ARC = YES;
-				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
-				CLANG_WARN_BOOL_CONVERSION = YES;
-				CLANG_WARN_COMMA = YES;
-				CLANG_WARN_CONSTANT_CONVERSION = YES;
-				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
-				CLANG_WARN_EMPTY_BODY = YES;
-				CLANG_WARN_ENUM_CONVERSION = YES;
-				CLANG_WARN_INFINITE_RECURSION = YES;
-				CLANG_WARN_INT_CONVERSION = YES;
-				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
-				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
-				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
-				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
-				CLANG_WARN_STRICT_PROTOTYPES = YES;
-				CLANG_WARN_SUSPICIOUS_MOVE = YES;
-				CLANG_WARN_UNREACHABLE_CODE = NO;
-				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
-				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
-				COPY_PHASE_STRIP = YES;
-				CURRENT_PROJECT_VERSION = 1;
-				ENABLE_STRICT_OBJC_MSGSEND = YES;
-				FRAMEWORK_SEARCH_PATHS = (
-					"$(inherited)",
-					"\"$(SRCROOT)\"",
-				);
-				GCC_C_LANGUAGE_STANDARD = gnu99;
-				GCC_NO_COMMON_BLOCKS = YES;
-				GCC_PREPROCESSOR_DEFINITIONS = (
-					"SD_WEBP=1",
-					"$(inherited)",
-				);
-				GCC_TREAT_WARNINGS_AS_ERRORS = NO;
-				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
-				GCC_WARN_ABOUT_MISSING_FIELD_INITIALIZERS = YES;
-				GCC_WARN_ABOUT_MISSING_NEWLINE = YES;
-				GCC_WARN_ABOUT_MISSING_PROTOTYPES = YES;
-				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
-				GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES;
-				GCC_WARN_SHADOW = YES;
-				GCC_WARN_SIGN_COMPARE = YES;
-				GCC_WARN_UNDECLARED_SELECTOR = YES;
-				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
-				GCC_WARN_UNUSED_FUNCTION = YES;
-				GCC_WARN_UNUSED_LABEL = YES;
-				GCC_WARN_UNUSED_PARAMETER = NO;
-				GCC_WARN_UNUSED_VARIABLE = YES;
-				HEADER_SEARCH_PATHS = Vendors/libwebp/src;
-				OTHER_LDFLAGS = "-ObjC";
-				RUN_CLANG_STATIC_ANALYZER = YES;
-				SKIP_INSTALL = YES;
-				VALIDATE_PRODUCT = YES;
+				INFOPLIST_FILE = WebImage/Info.plist;
 			};
 			name = Release;
 		};
 /* End XCBuildConfiguration section */
 
 /* Begin XCConfigurationList section */
-		00733A531BC487C100A5A117 /* Build configuration list for PBXNativeTarget "SDWebImage tvOS" */ = {
-			isa = XCConfigurationList;
-			buildConfigurations = (
-				00733A511BC487C100A5A117 /* Debug */,
-				00733A521BC487C100A5A117 /* Release */,
-			);
-			defaultConfigurationIsVisible = 0;
-			defaultConfigurationName = Release;
-		};
-		4314D1961D0E0E3B004B36C9 /* Build configuration list for PBXNativeTarget "SDWebImage watchOS static" */ = {
-			isa = XCConfigurationList;
-			buildConfigurations = (
-				4314D1971D0E0E3B004B36C9 /* Debug */,
-				4314D1981D0E0E3B004B36C9 /* Release */,
-			);
-			defaultConfigurationIsVisible = 0;
-			defaultConfigurationName = Release;
-		};
-		431BB7001D06D2C1006A3455 /* Build configuration list for PBXNativeTarget "SDWebImage watchOS" */ = {
+		326CA50F22BA14EF0033A92F /* Build configuration list for PBXAggregateTarget "SDWebImage XCFramework" */ = {
 			isa = XCConfigurationList;
 			buildConfigurations = (
-				431BB7011D06D2C1006A3455 /* Debug */,
-				431BB7021D06D2C1006A3455 /* Release */,
+				326CA50D22BA14EF0033A92F /* Debug */,
+				326CA50E22BA14EF0033A92F /* Release */,
 			);
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Release;
 		};
-		4397D2EF1D0DDD8C00BB2784 /* Build configuration list for PBXNativeTarget "SDWebImage OSX" */ = {
-			isa = XCConfigurationList;
-			buildConfigurations = (
-				4397D2F01D0DDD8C00BB2784 /* Debug */,
-				4397D2F11D0DDD8C00BB2784 /* Release */,
-			);
-			defaultConfigurationIsVisible = 0;
-			defaultConfigurationName = Release;
-		};
-		4A2CAE121AB4BB5400B6BC39 /* Build configuration list for PBXNativeTarget "SDWebImage iOS" */ = {
+		4A2CAE121AB4BB5400B6BC39 /* Build configuration list for PBXNativeTarget "SDWebImage" */ = {
 			isa = XCConfigurationList;
 			buildConfigurations = (
 				4A2CAE131AB4BB5400B6BC39 /* Debug */,
@@ -4037,7 +1449,7 @@
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Release;
 		};
-		53761322155AD0D5005750A4 /* Build configuration list for PBXNativeTarget "SDWebImage iOS static" */ = {
+		53761322155AD0D5005750A4 /* Build configuration list for PBXNativeTarget "SDWebImage static" */ = {
 			isa = XCConfigurationList;
 			buildConfigurations = (
 				53761323155AD0D5005750A4 /* Debug */,
@@ -4055,6 +1467,15 @@
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Release;
 		};
+		80B6DFEB2142B71600BCB334 /* Build configuration list for PBXNativeTarget "SDWebImageMapKit" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				80B6DFEC2142B71600BCB334 /* Debug */,
+				80B6DFED2142B71600BCB334 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
 /* End XCConfigurationList section */
 	};
 	rootObject = 53922D66148C55810056699D /* Project object */;
diff --git a/SDWebImage.xcodeproj/xcshareddata/xcschemes/SDWebImage tvOS.xcscheme b/SDWebImage.xcodeproj/xcshareddata/xcschemes/SDWebImage XCFramework.xcscheme
similarity index 68%
rename from SDWebImage.xcodeproj/xcshareddata/xcschemes/SDWebImage tvOS.xcscheme
rename to SDWebImage.xcodeproj/xcshareddata/xcschemes/SDWebImage XCFramework.xcscheme
index 9531bb102..c8f654d9e 100644
--- a/SDWebImage.xcodeproj/xcshareddata/xcschemes/SDWebImage tvOS.xcscheme	
+++ b/SDWebImage.xcodeproj/xcshareddata/xcschemes/SDWebImage XCFramework.xcscheme	
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0920"
-   version = "1.3">
+   LastUpgradeVersion = "1100"
+   version = "1.7">
    <BuildAction
       parallelizeBuildables = "YES"
       buildImplicitDependencies = "YES">
@@ -14,9 +14,9 @@
             buildForAnalyzing = "YES">
             <BuildableReference
                BuildableIdentifier = "primary"
-               BlueprintIdentifier = "00733A4B1BC487C000A5A117"
-               BuildableName = "SDWebImage.framework"
-               BlueprintName = "SDWebImage tvOS"
+               BlueprintIdentifier = "326CA50C22BA14EF0033A92F"
+               BuildableName = "SDWebImage XCFramework"
+               BlueprintName = "SDWebImage XCFramework"
                ReferencedContainer = "container:SDWebImage.xcodeproj">
             </BuildableReference>
          </BuildActionEntry>
@@ -26,35 +26,20 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
       shouldUseLaunchSchemeArgsEnv = "YES">
-      <Testables>
-      </Testables>
-      <AdditionalOptions>
-      </AdditionalOptions>
+      <TestPlans>
+      </TestPlans>
    </TestAction>
    <LaunchAction
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
       launchStyle = "0"
       useCustomWorkingDirectory = "NO"
       ignoresPersistentStateOnLaunch = "NO"
       debugDocumentVersioning = "YES"
       debugServiceExtension = "internal"
       allowLocationSimulation = "YES">
-      <MacroExpansion>
-         <BuildableReference
-            BuildableIdentifier = "primary"
-            BlueprintIdentifier = "00733A4B1BC487C000A5A117"
-            BuildableName = "SDWebImage.framework"
-            BlueprintName = "SDWebImage tvOS"
-            ReferencedContainer = "container:SDWebImage.xcodeproj">
-         </BuildableReference>
-      </MacroExpansion>
-      <AdditionalOptions>
-      </AdditionalOptions>
    </LaunchAction>
    <ProfileAction
       buildConfiguration = "Release"
@@ -65,9 +50,9 @@
       <MacroExpansion>
          <BuildableReference
             BuildableIdentifier = "primary"
-            BlueprintIdentifier = "00733A4B1BC487C000A5A117"
-            BuildableName = "SDWebImage.framework"
-            BlueprintName = "SDWebImage tvOS"
+            BlueprintIdentifier = "326CA50C22BA14EF0033A92F"
+            BuildableName = "SDWebImage XCFramework"
+            BlueprintName = "SDWebImage XCFramework"
             ReferencedContainer = "container:SDWebImage.xcodeproj">
          </BuildableReference>
       </MacroExpansion>
diff --git a/SDWebImage.xcodeproj/xcshareddata/xcschemes/SDWebImage iOS static.xcscheme b/SDWebImage.xcodeproj/xcshareddata/xcschemes/SDWebImage static.xcscheme
similarity index 88%
rename from SDWebImage.xcodeproj/xcshareddata/xcschemes/SDWebImage iOS static.xcscheme
rename to SDWebImage.xcodeproj/xcshareddata/xcschemes/SDWebImage static.xcscheme
index 6acfdae8d..1e8294ea4 100644
--- a/SDWebImage.xcodeproj/xcshareddata/xcschemes/SDWebImage iOS static.xcscheme	
+++ b/SDWebImage.xcodeproj/xcshareddata/xcschemes/SDWebImage static.xcscheme	
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0920"
+   LastUpgradeVersion = "1020"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -15,8 +15,8 @@
             <BuildableReference
                BuildableIdentifier = "primary"
                BlueprintIdentifier = "53761307155AD0D5005750A4"
-               BuildableName = "libSDWebImage iOS static.a"
-               BlueprintName = "SDWebImage iOS static"
+               BuildableName = "libSDWebImage.a"
+               BlueprintName = "SDWebImage static"
                ReferencedContainer = "container:SDWebImage.xcodeproj">
             </BuildableReference>
          </BuildActionEntry>
@@ -26,7 +26,6 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
       shouldUseLaunchSchemeArgsEnv = "YES">
       <Testables>
       </Testables>
@@ -37,7 +36,6 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
       launchStyle = "0"
       useCustomWorkingDirectory = "NO"
       ignoresPersistentStateOnLaunch = "NO"
@@ -48,8 +46,8 @@
          <BuildableReference
             BuildableIdentifier = "primary"
             BlueprintIdentifier = "53761307155AD0D5005750A4"
-            BuildableName = "libSDWebImage iOS static.a"
-            BlueprintName = "SDWebImage iOS static"
+            BuildableName = "libSDWebImage.a"
+            BlueprintName = "SDWebImage static"
             ReferencedContainer = "container:SDWebImage.xcodeproj">
          </BuildableReference>
       </MacroExpansion>
diff --git a/SDWebImage.xcodeproj/xcshareddata/xcschemes/SDWebImage iOS.xcscheme b/SDWebImage.xcodeproj/xcshareddata/xcschemes/SDWebImage.xcscheme
similarity index 89%
rename from SDWebImage.xcodeproj/xcshareddata/xcschemes/SDWebImage iOS.xcscheme
rename to SDWebImage.xcodeproj/xcshareddata/xcschemes/SDWebImage.xcscheme
index 042f8b285..37d11b296 100644
--- a/SDWebImage.xcodeproj/xcshareddata/xcschemes/SDWebImage iOS.xcscheme	
+++ b/SDWebImage.xcodeproj/xcshareddata/xcschemes/SDWebImage.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0920"
+   LastUpgradeVersion = "1020"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -16,7 +16,7 @@
                BuildableIdentifier = "primary"
                BlueprintIdentifier = "4A2CADFE1AB4BB5300B6BC39"
                BuildableName = "SDWebImage.framework"
-               BlueprintName = "SDWebImage iOS"
+               BlueprintName = "SDWebImage"
                ReferencedContainer = "container:SDWebImage.xcodeproj">
             </BuildableReference>
          </BuildActionEntry>
@@ -26,18 +26,14 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
       shouldUseLaunchSchemeArgsEnv = "YES">
       <Testables>
       </Testables>
-      <AdditionalOptions>
-      </AdditionalOptions>
    </TestAction>
    <LaunchAction
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
       launchStyle = "0"
       useCustomWorkingDirectory = "NO"
       ignoresPersistentStateOnLaunch = "NO"
@@ -49,12 +45,10 @@
             BuildableIdentifier = "primary"
             BlueprintIdentifier = "4A2CADFE1AB4BB5300B6BC39"
             BuildableName = "SDWebImage.framework"
-            BlueprintName = "SDWebImage iOS"
+            BlueprintName = "SDWebImage"
             ReferencedContainer = "container:SDWebImage.xcodeproj">
          </BuildableReference>
       </MacroExpansion>
-      <AdditionalOptions>
-      </AdditionalOptions>
    </LaunchAction>
    <ProfileAction
       buildConfiguration = "Release"
@@ -67,7 +61,7 @@
             BuildableIdentifier = "primary"
             BlueprintIdentifier = "4A2CADFE1AB4BB5300B6BC39"
             BuildableName = "SDWebImage.framework"
-            BlueprintName = "SDWebImage iOS"
+            BlueprintName = "SDWebImage"
             ReferencedContainer = "container:SDWebImage.xcodeproj">
          </BuildableReference>
       </MacroExpansion>
diff --git a/SDWebImage.xcodeproj/xcshareddata/xcschemes/SDWebImage OSX.xcscheme b/SDWebImage.xcodeproj/xcshareddata/xcschemes/SDWebImageMapKit.xcscheme
similarity index 81%
rename from SDWebImage.xcodeproj/xcshareddata/xcschemes/SDWebImage OSX.xcscheme
rename to SDWebImage.xcodeproj/xcshareddata/xcschemes/SDWebImageMapKit.xcscheme
index 703894ed4..ca5810945 100644
--- a/SDWebImage.xcodeproj/xcshareddata/xcschemes/SDWebImage OSX.xcscheme	
+++ b/SDWebImage.xcodeproj/xcshareddata/xcschemes/SDWebImageMapKit.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0920"
+   LastUpgradeVersion = "1020"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -14,9 +14,9 @@
             buildForAnalyzing = "YES">
             <BuildableReference
                BuildableIdentifier = "primary"
-               BlueprintIdentifier = "4397D2761D0DDD8C00BB2784"
-               BuildableName = "SDWebImage.framework"
-               BlueprintName = "SDWebImage OSX"
+               BlueprintIdentifier = "80B6DF862142B71600BCB334"
+               BuildableName = "SDWebImageMapKit.framework"
+               BlueprintName = "SDWebImageMapKit"
                ReferencedContainer = "container:SDWebImage.xcodeproj">
             </BuildableReference>
          </BuildActionEntry>
@@ -26,7 +26,6 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
       shouldUseLaunchSchemeArgsEnv = "YES">
       <Testables>
       </Testables>
@@ -37,7 +36,6 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
       launchStyle = "0"
       useCustomWorkingDirectory = "NO"
       ignoresPersistentStateOnLaunch = "NO"
@@ -47,9 +45,9 @@
       <MacroExpansion>
          <BuildableReference
             BuildableIdentifier = "primary"
-            BlueprintIdentifier = "4397D2761D0DDD8C00BB2784"
-            BuildableName = "SDWebImage.framework"
-            BlueprintName = "SDWebImage OSX"
+            BlueprintIdentifier = "80B6DF862142B71600BCB334"
+            BuildableName = "SDWebImageMapKit.framework"
+            BlueprintName = "SDWebImageMapKit"
             ReferencedContainer = "container:SDWebImage.xcodeproj">
          </BuildableReference>
       </MacroExpansion>
@@ -65,9 +63,9 @@
       <MacroExpansion>
          <BuildableReference
             BuildableIdentifier = "primary"
-            BlueprintIdentifier = "4397D2761D0DDD8C00BB2784"
-            BuildableName = "SDWebImage.framework"
-            BlueprintName = "SDWebImage OSX"
+            BlueprintIdentifier = "80B6DF862142B71600BCB334"
+            BuildableName = "SDWebImageMapKit.framework"
+            BlueprintName = "SDWebImageMapKit"
             ReferencedContainer = "container:SDWebImage.xcodeproj">
          </BuildableReference>
       </MacroExpansion>
diff --git a/SDWebImage.xcworkspace/contents.xcworkspacedata b/SDWebImage.xcworkspace/contents.xcworkspacedata
index b2e04319e..ffee24dc7 100644
--- a/SDWebImage.xcworkspace/contents.xcworkspacedata
+++ b/SDWebImage.xcworkspace/contents.xcworkspacedata
@@ -23,6 +23,6 @@
       location = "group:Docs">
    </FileRef>
    <FileRef
-      location = "group:Tests/Pods/Pods.xcodeproj">
+      location = "group:Pods/Pods.xcodeproj">
    </FileRef>
 </Workspace>
diff --git a/SDWebImage/NSButton+WebCache.h b/SDWebImage/Core/NSButton+WebCache.h
similarity index 68%
rename from SDWebImage/NSButton+WebCache.h
rename to SDWebImage/Core/NSButton+WebCache.h
index 57f7115e7..5b8035b7d 100644
--- a/SDWebImage/NSButton+WebCache.h
+++ b/SDWebImage/Core/NSButton+WebCache.h
@@ -12,6 +12,9 @@
 
 #import "SDWebImageManager.h"
 
+/**
+ * Integrates SDWebImage async downloading and caching of remote images with NSButton.
+ */
 @interface NSButton (WebCache)
 
 #pragma mark - Image
@@ -19,7 +22,7 @@
 /**
  * Get the current image URL.
  */
-- (nullable NSURL *)sd_currentImageURL;
+@property (nonatomic, strong, readonly, nullable) NSURL *sd_currentImageURL;
 
 /**
  * Set the button `image` with an `url`.
@@ -55,6 +58,21 @@
           placeholderImage:(nullable UIImage *)placeholder
                    options:(SDWebImageOptions)options NS_REFINED_FOR_SWIFT;
 
+/**
+ * Set the button `image` with an `url`, placeholder and custom options.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url         The url for the image.
+ * @param placeholder The image to be set initially, until the image request finishes.
+ * @param options     The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param context     A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+          placeholderImage:(nullable UIImage *)placeholder
+                   options:(SDWebImageOptions)options
+                   context:(nullable SDWebImageContext *)context;
+
 /**
  * Set the button `image` with an `url`.
  *
@@ -125,7 +143,31 @@
 - (void)sd_setImageWithURL:(nullable NSURL *)url
           placeholderImage:(nullable UIImage *)placeholder
                    options:(SDWebImageOptions)options
-                  progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                  progress:(nullable SDImageLoaderProgressBlock)progressBlock
+                 completed:(nullable SDExternalCompletionBlock)completedBlock;
+
+/**
+ * Set the button `image` with an `url`, placeholder and custom options.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param placeholder    The image to be set initially, until the image request finishes.
+ * @param options        The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param context        A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
+ * @param progressBlock  A block called while image is downloading
+ *                       @note the progress block is executed on a background queue
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+          placeholderImage:(nullable UIImage *)placeholder
+                   options:(SDWebImageOptions)options
+                   context:(nullable SDWebImageContext *)context
+                  progress:(nullable SDImageLoaderProgressBlock)progressBlock
                  completed:(nullable SDExternalCompletionBlock)completedBlock;
 
 #pragma mark - Alternate Image
@@ -133,7 +175,7 @@
 /**
  * Get the current alternateImage URL.
  */
-- (nullable NSURL *)sd_currentAlternateImageURL;
+@property (nonatomic, strong, readonly, nullable) NSURL *sd_currentAlternateImageURL;
 
 /**
  * Set the button `alternateImage` with an `url`.
@@ -169,6 +211,21 @@
                    placeholderImage:(nullable UIImage *)placeholder
                             options:(SDWebImageOptions)options NS_REFINED_FOR_SWIFT;
 
+/**
+ * Set the button `alternateImage` with an `url`, placeholder, custom options and context.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url         The url for the alternateImage.
+ * @param placeholder The alternateImage to be set initially, until the alternateImage request finishes.
+ * @param options     The options to use when downloading the alternateImage. @see SDWebImageOptions for the possible values.
+ * @param context     A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
+ */
+- (void)sd_setAlternateImageWithURL:(nullable NSURL *)url
+                   placeholderImage:(nullable UIImage *)placeholder
+                            options:(SDWebImageOptions)options
+                            context:(nullable SDWebImageContext *)context;
+
 /**
  * Set the button `alternateImage` with an `url`.
  *
@@ -239,7 +296,31 @@
 - (void)sd_setAlternateImageWithURL:(nullable NSURL *)url
                    placeholderImage:(nullable UIImage *)placeholder
                             options:(SDWebImageOptions)options
-                           progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                           progress:(nullable SDImageLoaderProgressBlock)progressBlock
+                          completed:(nullable SDExternalCompletionBlock)completedBlock;
+
+/**
+ * Set the button `alternateImage` with an `url`, placeholder, custom options and context.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the alternateImage.
+ * @param placeholder    The alternateImage to be set initially, until the alternateImage request finishes.
+ * @param options        The options to use when downloading the alternateImage. @see SDWebImageOptions for the possible values.
+ * @param context        A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
+ * @param progressBlock  A block called while alternateImage is downloading
+ *                       @note the progress block is executed on a background queue
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the alternateImage parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the alternateImage was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original alternateImage url.
+ */
+- (void)sd_setAlternateImageWithURL:(nullable NSURL *)url
+                   placeholderImage:(nullable UIImage *)placeholder
+                            options:(SDWebImageOptions)options
+                            context:(nullable SDWebImageContext *)context
+                           progress:(nullable SDImageLoaderProgressBlock)progressBlock
                           completed:(nullable SDExternalCompletionBlock)completedBlock;
 
 #pragma mark - Cancel
diff --git a/SDWebImage/NSButton+WebCache.m b/SDWebImage/Core/NSButton+WebCache.m
similarity index 56%
rename from SDWebImage/NSButton+WebCache.m
rename to SDWebImage/Core/NSButton+WebCache.m
index 3ca080f2f..953baf115 100644
--- a/SDWebImage/NSButton+WebCache.m
+++ b/SDWebImage/Core/NSButton+WebCache.m
@@ -12,15 +12,9 @@
 
 #import "objc/runtime.h"
 #import "UIView+WebCacheOperation.h"
+#import "UIView+WebCacheState.h"
 #import "UIView+WebCache.h"
-
-static inline NSString * imageOperationKey() {
-    return @"NSButtonImageOperation";
-}
-
-static inline NSString * alternateImageOperationKey() {
-    return @"NSButtonAlternateImageOperation";
-}
+#import "SDInternalMacros.h"
 
 @implementation NSButton (WebCache)
 
@@ -38,6 +32,10 @@ - (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIIm
     [self sd_setImageWithURL:url placeholderImage:placeholder options:options progress:nil completed:nil];
 }
 
+- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options context:(nullable SDWebImageContext *)context {
+    [self sd_setImageWithURL:url placeholderImage:placeholder options:options context:context progress:nil completed:nil];
+}
+
 - (void)sd_setImageWithURL:(nullable NSURL *)url completed:(nullable SDExternalCompletionBlock)completedBlock {
     [self sd_setImageWithURL:url placeholderImage:nil options:0 progress:nil completed:completedBlock];
 }
@@ -50,23 +48,27 @@ - (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIIm
     [self sd_setImageWithURL:url placeholderImage:placeholder options:options progress:nil completed:completedBlock];
 }
 
+- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options progress:(nullable SDImageLoaderProgressBlock)progressBlock completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setImageWithURL:url placeholderImage:placeholder options:options context:nil progress:progressBlock completed:completedBlock];
+}
+
 - (void)sd_setImageWithURL:(nullable NSURL *)url
           placeholderImage:(nullable UIImage *)placeholder
                    options:(SDWebImageOptions)options
-                  progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                   context:(nullable SDWebImageContext *)context
+                  progress:(nullable SDImageLoaderProgressBlock)progressBlock
                  completed:(nullable SDExternalCompletionBlock)completedBlock {
-    self.sd_currentImageURL = url;
-    
-    __weak typeof(self)weakSelf = self;
     [self sd_internalSetImageWithURL:url
                     placeholderImage:placeholder
                              options:options
-                        operationKey:imageOperationKey()
-                       setImageBlock:^(NSImage * _Nullable image, NSData * _Nullable imageData) {
-                           weakSelf.image = image;
-                       }
+                             context:context
+                       setImageBlock:nil
                             progress:progressBlock
-                           completed:completedBlock];
+                           completed:^(NSImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+                               if (completedBlock) {
+                                   completedBlock(image, error, cacheType, imageURL);
+                               }
+                           }];
 }
 
 #pragma mark - Alternate Image
@@ -83,6 +85,10 @@ - (void)sd_setAlternateImageWithURL:(nullable NSURL *)url placeholderImage:(null
     [self sd_setAlternateImageWithURL:url placeholderImage:placeholder options:options progress:nil completed:nil];
 }
 
+- (void)sd_setAlternateImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options context:(nullable SDWebImageContext *)context {
+    [self sd_setAlternateImageWithURL:url placeholderImage:placeholder options:options context:context progress:nil completed:nil];
+}
+
 - (void)sd_setAlternateImageWithURL:(nullable NSURL *)url completed:(nullable SDExternalCompletionBlock)completedBlock {
     [self sd_setAlternateImageWithURL:url placeholderImage:nil options:0 progress:nil completed:completedBlock];
 }
@@ -95,51 +101,60 @@ - (void)sd_setAlternateImageWithURL:(nullable NSURL *)url placeholderImage:(null
     [self sd_setAlternateImageWithURL:url placeholderImage:placeholder options:options progress:nil completed:completedBlock];
 }
 
+- (void)sd_setAlternateImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options progress:(nullable SDImageLoaderProgressBlock)progressBlock completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setAlternateImageWithURL:url placeholderImage:placeholder options:options context:nil progress:progressBlock completed:completedBlock];
+}
+
 - (void)sd_setAlternateImageWithURL:(nullable NSURL *)url
                    placeholderImage:(nullable UIImage *)placeholder
                             options:(SDWebImageOptions)options
-                           progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                            context:(nullable SDWebImageContext *)context
+                           progress:(nullable SDImageLoaderProgressBlock)progressBlock
                           completed:(nullable SDExternalCompletionBlock)completedBlock {
-    self.sd_currentAlternateImageURL = url;
-    
-    __weak typeof(self)weakSelf = self;
+    SDWebImageMutableContext *mutableContext;
+    if (context) {
+        mutableContext = [context mutableCopy];
+    } else {
+        mutableContext = [NSMutableDictionary dictionary];
+    }
+    mutableContext[SDWebImageContextSetImageOperationKey] = @keypath(self, alternateImage);
+    @weakify(self);
     [self sd_internalSetImageWithURL:url
                     placeholderImage:placeholder
                              options:options
-                        operationKey:alternateImageOperationKey()
-                       setImageBlock:^(NSImage * _Nullable image, NSData * _Nullable imageData) {
-                           weakSelf.alternateImage = image;
+                             context:mutableContext
+                       setImageBlock:^(NSImage * _Nullable image, NSData * _Nullable imageData, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+                           @strongify(self);
+                           self.alternateImage = image;
                        }
                             progress:progressBlock
-                           completed:completedBlock];
+                           completed:^(NSImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+                               if (completedBlock) {
+                                   completedBlock(image, error, cacheType, imageURL);
+                               }
+                           }];
 }
 
 #pragma mark - Cancel
 
 - (void)sd_cancelCurrentImageLoad {
-    [self sd_cancelImageLoadOperationWithKey:imageOperationKey()];
+    [self sd_cancelImageLoadOperationWithKey:nil];
 }
 
 - (void)sd_cancelCurrentAlternateImageLoad {
-    [self sd_cancelImageLoadOperationWithKey:alternateImageOperationKey()];
+    [self sd_cancelImageLoadOperationWithKey:@keypath(self, alternateImage)];
 }
 
-#pragma mar - Private
+#pragma mark - State
 
 - (NSURL *)sd_currentImageURL {
-    return objc_getAssociatedObject(self, @selector(sd_currentImageURL));
+    return [self sd_imageLoadStateForKey:nil].url;
 }
 
-- (void)setSd_currentImageURL:(NSURL *)sd_currentImageURL {
-    objc_setAssociatedObject(self, @selector(sd_currentImageURL), sd_currentImageURL, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
-}
+#pragma mark - Alternate State
 
 - (NSURL *)sd_currentAlternateImageURL {
-    return objc_getAssociatedObject(self, @selector(sd_currentAlternateImageURL));
-}
-
-- (void)setSd_currentAlternateImageURL:(NSURL *)sd_currentAlternateImageURL {
-    objc_setAssociatedObject(self, @selector(sd_currentAlternateImageURL), sd_currentAlternateImageURL, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+    return [self sd_imageLoadStateForKey:@keypath(self, alternateImage)].url;
 }
 
 @end
diff --git a/SDWebImage/Core/NSData+ImageContentType.h b/SDWebImage/Core/NSData+ImageContentType.h
new file mode 100644
index 000000000..b9a6aa381
--- /dev/null
+++ b/SDWebImage/Core/NSData+ImageContentType.h
@@ -0,0 +1,63 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ * (c) Fabrice Aneche
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCompat.h"
+
+/**
+ You can use switch case like normal enum. It's also recommended to add a default case. You should not assume anything about the raw value.
+ For custom coder plugin, it can also extern the enum for supported format. See `SDImageCoder` for more detailed information.
+ */
+typedef NSInteger SDImageFormat NS_TYPED_EXTENSIBLE_ENUM;
+static const SDImageFormat SDImageFormatUndefined = -1;
+static const SDImageFormat SDImageFormatJPEG      = 0;
+static const SDImageFormat SDImageFormatPNG       = 1;
+static const SDImageFormat SDImageFormatGIF       = 2;
+static const SDImageFormat SDImageFormatTIFF      = 3;
+static const SDImageFormat SDImageFormatWebP      = 4;
+static const SDImageFormat SDImageFormatHEIC      = 5;
+static const SDImageFormat SDImageFormatHEIF      = 6;
+static const SDImageFormat SDImageFormatPDF       = 7;
+static const SDImageFormat SDImageFormatSVG       = 8;
+static const SDImageFormat SDImageFormatBMP       = 9;
+static const SDImageFormat SDImageFormatRAW       = 10;
+
+/**
+ NSData category about the image content type and UTI.
+ */
+@interface NSData (ImageContentType)
+
+/**
+ *  Return image format
+ *
+ *  @param data the input image data
+ *
+ *  @return the image format as `SDImageFormat` (enum)
+ */
++ (SDImageFormat)sd_imageFormatForImageData:(nullable NSData *)data;
+
+/**
+ *  Convert SDImageFormat to UTType
+ *
+ *  @param format Format as SDImageFormat
+ *  @return The UTType as CFStringRef
+ *  @note For unknown format, `kSDUTTypeImage` abstract type will return
+ */
++ (nonnull CFStringRef)sd_UTTypeFromImageFormat:(SDImageFormat)format CF_RETURNS_NOT_RETAINED NS_SWIFT_NAME(sd_UTType(from:));
+
+/**
+ *  Convert UTType to SDImageFormat
+ *
+ *  @param uttype The UTType as CFStringRef
+ *  @return The Format as SDImageFormat
+ *  @note For unknown type, `SDImageFormatUndefined` will return
+ */
++ (SDImageFormat)sd_imageFormatFromUTType:(nonnull CFStringRef)uttype;
+
+@end
diff --git a/SDWebImage/NSData+ImageContentType.m b/SDWebImage/Core/NSData+ImageContentType.m
similarity index 54%
rename from SDWebImage/NSData+ImageContentType.m
rename to SDWebImage/Core/NSData+ImageContentType.m
index 64ea0a306..c5f18cc19 100644
--- a/SDWebImage/NSData+ImageContentType.m
+++ b/SDWebImage/Core/NSData+ImageContentType.m
@@ -13,11 +13,9 @@
 #else
 #import <MobileCoreServices/MobileCoreServices.h>
 #endif
+#import "SDImageIOAnimatedCoderInternal.h"
 
-// Currently Image/IO does not support WebP
-#define kSDUTTypeWebP ((__bridge CFStringRef)@"public.webp")
-// AVFileTypeHEIC is defined in AVFoundation via iOS 11, we use this without import AVFoundation
-#define kSDUTTypeHEIC ((__bridge CFStringRef)@"public.heic")
+#define kSVGTagEnd @"</svg>"
 
 @implementation NSData (ImageContentType)
 
@@ -39,6 +37,8 @@ + (SDImageFormat)sd_imageFormatForImageData:(nullable NSData *)data {
         case 0x49:
         case 0x4D:
             return SDImageFormatTIFF;
+        case 0x42:
+            return SDImageFormatBMP;
         case 0x52: {
             if (data.length >= 12) {
                 //RIFF....WEBP
@@ -59,6 +59,27 @@ + (SDImageFormat)sd_imageFormatForImageData:(nullable NSData *)data {
                     || [testString isEqualToString:@"ftyphevx"]) {
                     return SDImageFormatHEIC;
                 }
+                //....ftypmif1 ....ftypmsf1
+                if ([testString isEqualToString:@"ftypmif1"] || [testString isEqualToString:@"ftypmsf1"]) {
+                    return SDImageFormatHEIF;
+                }
+            }
+            break;
+        }
+        case 0x25: {
+            if (data.length >= 4) {
+                //%PDF
+                NSString *testString = [[NSString alloc] initWithData:[data subdataWithRange:NSMakeRange(1, 3)] encoding:NSASCIIStringEncoding];
+                if ([testString isEqualToString:@"PDF"]) {
+                    return SDImageFormatPDF;
+                }
+            }
+            break;
+        }
+        case 0x3C: {
+            // Check end with SVG tag
+            if ([data rangeOfData:[kSVGTagEnd dataUsingEncoding:NSUTF8StringEncoding] options:NSDataSearchBackwards range: NSMakeRange(data.length - MIN(100, data.length), MIN(100, data.length))].location != NSNotFound) {
+                return SDImageFormatSVG;
             }
             break;
         }
@@ -66,20 +87,20 @@ + (SDImageFormat)sd_imageFormatForImageData:(nullable NSData *)data {
     return SDImageFormatUndefined;
 }
 
-+ (nonnull CFStringRef)sd_UTTypeFromSDImageFormat:(SDImageFormat)format {
++ (nonnull CFStringRef)sd_UTTypeFromImageFormat:(SDImageFormat)format {
     CFStringRef UTType;
     switch (format) {
         case SDImageFormatJPEG:
-            UTType = kUTTypeJPEG;
+            UTType = kSDUTTypeJPEG;
             break;
         case SDImageFormatPNG:
-            UTType = kUTTypePNG;
+            UTType = kSDUTTypePNG;
             break;
         case SDImageFormatGIF:
-            UTType = kUTTypeGIF;
+            UTType = kSDUTTypeGIF;
             break;
         case SDImageFormatTIFF:
-            UTType = kUTTypeTIFF;
+            UTType = kSDUTTypeTIFF;
             break;
         case SDImageFormatWebP:
             UTType = kSDUTTypeWebP;
@@ -87,9 +108,24 @@ + (nonnull CFStringRef)sd_UTTypeFromSDImageFormat:(SDImageFormat)format {
         case SDImageFormatHEIC:
             UTType = kSDUTTypeHEIC;
             break;
+        case SDImageFormatHEIF:
+            UTType = kSDUTTypeHEIF;
+            break;
+        case SDImageFormatPDF:
+            UTType = kSDUTTypePDF;
+            break;
+        case SDImageFormatSVG:
+            UTType = kSDUTTypeSVG;
+            break;
+        case SDImageFormatBMP:
+            UTType = kSDUTTypeBMP;
+            break;
+        case SDImageFormatRAW:
+            UTType = kSDUTTypeRAW;
+            break;
         default:
-            // default is kUTTypePNG
-            UTType = kUTTypePNG;
+            // default is kUTTypeImage abstract type
+            UTType = kSDUTTypeImage;
             break;
     }
     return UTType;
@@ -100,18 +136,28 @@ + (SDImageFormat)sd_imageFormatFromUTType:(CFStringRef)uttype {
         return SDImageFormatUndefined;
     }
     SDImageFormat imageFormat;
-    if (CFStringCompare(uttype, kUTTypeJPEG, 0) == kCFCompareEqualTo) {
+    if (CFStringCompare(uttype, kSDUTTypeJPEG, 0) == kCFCompareEqualTo) {
         imageFormat = SDImageFormatJPEG;
-    } else if (CFStringCompare(uttype, kUTTypePNG, 0) == kCFCompareEqualTo) {
+    } else if (CFStringCompare(uttype, kSDUTTypePNG, 0) == kCFCompareEqualTo) {
         imageFormat = SDImageFormatPNG;
-    } else if (CFStringCompare(uttype, kUTTypeGIF, 0) == kCFCompareEqualTo) {
+    } else if (CFStringCompare(uttype, kSDUTTypeGIF, 0) == kCFCompareEqualTo) {
         imageFormat = SDImageFormatGIF;
-    } else if (CFStringCompare(uttype, kUTTypeTIFF, 0) == kCFCompareEqualTo) {
+    } else if (CFStringCompare(uttype, kSDUTTypeTIFF, 0) == kCFCompareEqualTo) {
         imageFormat = SDImageFormatTIFF;
     } else if (CFStringCompare(uttype, kSDUTTypeWebP, 0) == kCFCompareEqualTo) {
         imageFormat = SDImageFormatWebP;
     } else if (CFStringCompare(uttype, kSDUTTypeHEIC, 0) == kCFCompareEqualTo) {
         imageFormat = SDImageFormatHEIC;
+    } else if (CFStringCompare(uttype, kSDUTTypeHEIF, 0) == kCFCompareEqualTo) {
+        imageFormat = SDImageFormatHEIF;
+    } else if (CFStringCompare(uttype, kSDUTTypePDF, 0) == kCFCompareEqualTo) {
+        imageFormat = SDImageFormatPDF;
+    } else if (CFStringCompare(uttype, kSDUTTypeSVG, 0) == kCFCompareEqualTo) {
+        imageFormat = SDImageFormatSVG;
+    } else if (CFStringCompare(uttype, kSDUTTypeBMP, 0) == kCFCompareEqualTo) {
+        imageFormat = SDImageFormatBMP;
+    } else if (UTTypeConformsTo(uttype, kSDUTTypeRAW)) {
+        imageFormat = SDImageFormatRAW;
     } else {
         imageFormat = SDImageFormatUndefined;
     }
diff --git a/SDWebImage/Core/NSImage+Compatibility.h b/SDWebImage/Core/NSImage+Compatibility.h
new file mode 100644
index 000000000..0a562cc43
--- /dev/null
+++ b/SDWebImage/Core/NSImage+Compatibility.h
@@ -0,0 +1,67 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+
+#if SD_MAC
+
+/**
+ This category is provided to easily write cross-platform(AppKit/UIKit) code. For common usage, see `UIImage+Metadata.h`.
+ */
+@interface NSImage (Compatibility)
+
+/**
+The underlying Core Graphics image object. This will actually use `CGImageForProposedRect` with the image size.
+ */
+@property (nonatomic, readonly, nullable) CGImageRef CGImage;
+/**
+ The underlying Core Image data. This will actually use `bestRepresentationForRect` with the image size to find the `NSCIImageRep`.
+ */
+@property (nonatomic, readonly, nullable) CIImage *CIImage;
+/**
+ The scale factor of the image. This wil actually use `bestRepresentationForRect` with image size and pixel size to calculate the scale factor. If failed, use the default value 1.0. Should be greater than or equal to 1.0.
+ */
+@property (nonatomic, readonly) CGFloat scale;
+
+// These are convenience methods to make AppKit's `NSImage` match UIKit's `UIImage` behavior. The scale factor should be greater than or equal to 1.0.
+
+/**
+ Returns an image object with the scale factor and orientation. The representation is created from the Core Graphics image object.
+ @note The difference between this and `initWithCGImage:size` is that `initWithCGImage:size` will actually create a `NSCGImageSnapshotRep` representation and always use `backingScaleFactor` as scale factor. So we should avoid it and use `NSBitmapImageRep` with `initWithCGImage:` instead.
+ @note The difference between this and UIKit's `UIImage` equivalent method is the way to process orientation. If the provided image orientation is not equal to Up orientation, this method will firstly rotate the CGImage to the correct orientation to work compatible with `NSImageView`. However, UIKit will not actually rotate CGImage and just store it as `imageOrientation` property.
+
+ @param cgImage A Core Graphics image object
+ @param scale The image scale factor
+ @param orientation The orientation of the image data
+ @return The image object
+ */
+- (nonnull instancetype)initWithCGImage:(nonnull CGImageRef)cgImage scale:(CGFloat)scale orientation:(CGImagePropertyOrientation)orientation;
+
+/**
+ Initializes and returns an image object with the specified Core Image object. The representation is `NSCIImageRep`.
+ 
+ @param ciImage A Core Image image object
+ @param scale The image scale factor
+ @param orientation The orientation of the image data
+ @return The image object
+ */
+- (nonnull instancetype)initWithCIImage:(nonnull CIImage *)ciImage scale:(CGFloat)scale orientation:(CGImagePropertyOrientation)orientation;
+
+/**
+ Returns an image object with the scale factor. The representation is created from the image data.
+ @note The difference between these this and `initWithData:` is that `initWithData:` will always use `backingScaleFactor` as scale factor.
+
+ @param data The image data
+ @param scale The image scale factor
+ @return The image object
+ */
+- (nullable instancetype)initWithData:(nonnull NSData *)data scale:(CGFloat)scale;
+
+@end
+
+#endif
diff --git a/SDWebImage/Core/NSImage+Compatibility.m b/SDWebImage/Core/NSImage+Compatibility.m
new file mode 100644
index 000000000..ce67151ef
--- /dev/null
+++ b/SDWebImage/Core/NSImage+Compatibility.m
@@ -0,0 +1,120 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "NSImage+Compatibility.h"
+
+#if SD_MAC
+
+#import "SDImageCoderHelper.h"
+
+@implementation NSImage (Compatibility)
+
+- (nullable CGImageRef)CGImage {
+    NSRect imageRect = NSMakeRect(0, 0, self.size.width, self.size.height);
+    CGImageRef cgImage = [self CGImageForProposedRect:&imageRect context:nil hints:nil];
+    return cgImage;
+}
+
+- (nullable CIImage *)CIImage {
+    NSRect imageRect = NSMakeRect(0, 0, self.size.width, self.size.height);
+    NSImageRep *imageRep = [self bestRepresentationForRect:imageRect context:nil hints:nil];
+    if (![imageRep isKindOfClass:NSCIImageRep.class]) {
+        return nil;
+    }
+    return ((NSCIImageRep *)imageRep).CIImage;
+}
+
+- (CGFloat)scale {
+    CGFloat scale = 1;
+    NSRect imageRect = NSMakeRect(0, 0, self.size.width, self.size.height);
+    NSImageRep *imageRep = [self bestRepresentationForRect:imageRect context:nil hints:nil];
+    CGFloat width = imageRep.size.width;
+    CGFloat height = imageRep.size.height;
+    CGFloat pixelWidth = (CGFloat)imageRep.pixelsWide;
+    CGFloat pixelHeight = (CGFloat)imageRep.pixelsHigh;
+    if (width > 0 && height > 0) {
+        CGFloat widthScale = pixelWidth / width;
+        CGFloat heightScale = pixelHeight / height;
+        if (widthScale == heightScale && widthScale >= 1) {
+            // Protect because there may be `NSImageRepMatchesDevice` (0)
+            scale = widthScale;
+        }
+    }
+    
+    return scale;
+}
+
+- (instancetype)initWithCGImage:(nonnull CGImageRef)cgImage scale:(CGFloat)scale orientation:(CGImagePropertyOrientation)orientation {
+    NSBitmapImageRep *imageRep;
+    if (orientation != kCGImagePropertyOrientationUp) {
+        // AppKit design is different from UIKit. Where CGImage based image rep does not respect to any orientation. Only data based image rep which contains the EXIF metadata can automatically detect orientation.
+        // This should be nonnull, until the memory is exhausted cause `CGBitmapContextCreate` failed.
+        CGImageRef rotatedCGImage = [SDImageCoderHelper CGImageCreateDecoded:cgImage orientation:orientation];
+        imageRep = [[NSBitmapImageRep alloc] initWithCGImage:rotatedCGImage];
+        CGImageRelease(rotatedCGImage);
+    } else {
+        imageRep = [[NSBitmapImageRep alloc] initWithCGImage:cgImage];
+    }
+    if (scale < 1) {
+        scale = 1;
+    }
+    CGFloat pixelWidth = imageRep.pixelsWide;
+    CGFloat pixelHeight = imageRep.pixelsHigh;
+    NSSize size = NSMakeSize(pixelWidth / scale, pixelHeight / scale);
+    self = [self initWithSize:size];
+    if (self) {
+        imageRep.size = size;
+        [self addRepresentation:imageRep];
+    }
+    return self;
+}
+
+- (instancetype)initWithCIImage:(nonnull CIImage *)ciImage scale:(CGFloat)scale orientation:(CGImagePropertyOrientation)orientation {
+    NSCIImageRep *imageRep;
+    if (orientation != kCGImagePropertyOrientationUp) {
+        CIImage *rotatedCIImage = [ciImage imageByApplyingOrientation:orientation];
+        imageRep = [[NSCIImageRep alloc] initWithCIImage:rotatedCIImage];
+    } else {
+        imageRep = [[NSCIImageRep alloc] initWithCIImage:ciImage];
+    }
+    if (scale < 1) {
+        scale = 1;
+    }
+    CGFloat pixelWidth = imageRep.pixelsWide;
+    CGFloat pixelHeight = imageRep.pixelsHigh;
+    NSSize size = NSMakeSize(pixelWidth / scale, pixelHeight / scale);
+    self = [self initWithSize:size];
+    if (self) {
+        imageRep.size = size;
+        [self addRepresentation:imageRep];
+    }
+    return self;
+}
+
+- (instancetype)initWithData:(nonnull NSData *)data scale:(CGFloat)scale {
+    NSBitmapImageRep *imageRep = [[NSBitmapImageRep alloc] initWithData:data];
+    if (!imageRep) {
+        return nil;
+    }
+    if (scale < 1) {
+        scale = 1;
+    }
+    CGFloat pixelWidth = imageRep.pixelsWide;
+    CGFloat pixelHeight = imageRep.pixelsHigh;
+    NSSize size = NSMakeSize(pixelWidth / scale, pixelHeight / scale);
+    self = [self initWithSize:size];
+    if (self) {
+        imageRep.size = size;
+        [self addRepresentation:imageRep];
+    }
+    return self;
+}
+
+@end
+
+#endif
diff --git a/SDWebImage/Core/SDAnimatedImage.h b/SDWebImage/Core/SDAnimatedImage.h
new file mode 100644
index 000000000..b96027d31
--- /dev/null
+++ b/SDWebImage/Core/SDAnimatedImage.h
@@ -0,0 +1,136 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+#import "SDImageCoder.h"
+
+
+/**
+ This is the protocol for SDAnimatedImage class only but not for SDAnimatedImageCoder. If you want to provide a custom animated image class with full advanced function, you can conform to this instead of the base protocol.
+ */
+@protocol SDAnimatedImage <SDAnimatedImageProvider>
+
+@required
+/**
+ Initializes and returns the image object with the specified data, scale factor and possible animation decoding options.
+ @note We use this to create animated image instance for normal animation decoding.
+ 
+ @param data The data object containing the image data.
+ @param scale The scale factor to assume when interpreting the image data. Applying a scale factor of 1.0 results in an image whose size matches the pixel-based dimensions of the image. Applying a different scale factor changes the size of the image as reported by the `size` property.
+ @param options A dictionary containing any animation decoding options.
+ @return An initialized object
+ */
+- (nullable instancetype)initWithData:(nonnull NSData *)data scale:(CGFloat)scale options:(nullable SDImageCoderOptions *)options;
+
+/**
+ Initializes the image with an animated coder. You can use the coder to decode the image frame later.
+ @note We use this with animated coder which conforms to `SDProgressiveImageCoder` for progressive animation decoding.
+ 
+ @param animatedCoder An animated coder which conform `SDAnimatedImageCoder` protocol
+ @param scale The scale factor to assume when interpreting the image data. Applying a scale factor of 1.0 results in an image whose size matches the pixel-based dimensions of the image. Applying a different scale factor changes the size of the image as reported by the `size` property.
+ @return An initialized object
+ */
+- (nullable instancetype)initWithAnimatedCoder:(nonnull id<SDAnimatedImageCoder>)animatedCoder scale:(CGFloat)scale;
+
+@optional
+// These methods are used for optional advanced feature, like image frame preloading.
+/**
+ Pre-load all animated image frame into memory. Then later frame image request can directly return the frame for index without decoding.
+ This method may be called on background thread.
+ 
+ @note If one image instance is shared by lots of imageViews, the CPU performance for large animated image will drop down because the request frame index will be random (not in order) and the decoder should take extra effort to keep it re-entrant. You can use this to reduce CPU usage if need. Attention this will consume more memory usage.
+ */
+- (void)preloadAllFrames;
+
+/**
+ Unload all animated image frame from memory if are already pre-loaded. Then later frame image request need decoding. You can use this to free up the memory usage if need.
+ */
+- (void)unloadAllFrames;
+
+/**
+ Returns a Boolean value indicating whether all animated image frames are already pre-loaded into memory.
+ */
+@property (nonatomic, assign, readonly, getter=isAllFramesLoaded) BOOL allFramesLoaded;
+
+/**
+ Return the animated image coder if the image is created with `initWithAnimatedCoder:scale:` method.
+ @note We use this with animated coder which conforms to `SDProgressiveImageCoder` for progressive animation decoding.
+ */
+@property (nonatomic, strong, readonly, nullable) id<SDAnimatedImageCoder> animatedCoder;
+
+@end
+
+/**
+ The image class which supports animating on `SDAnimatedImageView`. You can also use it on normal UIImageView/NSImageView.
+ */
+NS_SWIFT_NONISOLATED
+@interface SDAnimatedImage : UIImage <SDAnimatedImage>
+
+// This class override these methods from UIImage(NSImage), and it supports NSSecureCoding.
+// You should use these methods to create a new animated image. Use other methods just call super instead.
+// @note Before 5.19, these initializer will return nil for static image (when all candidate SDAnimatedImageCoder returns nil instance), like JPEG data. After 5.19, these initializer will retry for static image as well, so JPEG data will return non-nil instance. For vector image(PDF/SVG), always return nil.
+// @note When the animated image frame count <= 1, all the `SDAnimatedImageProvider` protocol methods will return nil or 0 value, you'd better check the frame count before usage and keep fallback.
++ (nullable instancetype)imageNamed:(nonnull NSString *)name; // Cache in memory, no Asset Catalog support
+#if __has_include(<UIKit/UITraitCollection.h>) && !SD_WATCH
++ (nullable instancetype)imageNamed:(nonnull NSString *)name inBundle:(nullable NSBundle *)bundle compatibleWithTraitCollection:(nullable UITraitCollection *)traitCollection; // Cache in memory, no Asset Catalog support
+#else
++ (nullable instancetype)imageNamed:(nonnull NSString *)name inBundle:(nullable NSBundle *)bundle; // Cache in memory, no Asset Catalog support
+#endif
++ (nullable instancetype)imageWithContentsOfFile:(nonnull NSString *)path;
++ (nullable instancetype)imageWithData:(nonnull NSData *)data;
++ (nullable instancetype)imageWithData:(nonnull NSData *)data scale:(CGFloat)scale;
+- (nullable instancetype)initWithContentsOfFile:(nonnull NSString *)path;
+- (nullable instancetype)initWithData:(nonnull NSData *)data;
+- (nullable instancetype)initWithData:(nonnull NSData *)data scale:(CGFloat)scale;
+
+/**
+ Current animated image format.
+ @note This format is only valid when `animatedImageData` not nil.
+ @note This actually just call `[NSData sd_imageFormatForImageData:self.animatedImageData]`
+ */
+@property (nonatomic, assign, readonly) SDImageFormat animatedImageFormat;
+
+/**
+ Current animated image data, you can use this to grab the compressed format data and create another animated image instance.
+ If this image instance is an animated image created by using animated image coder (which means using the API listed above or using `initWithAnimatedCoder:scale:`), this property is non-nil.
+ */
+@property (nonatomic, copy, readonly, nullable) NSData *animatedImageData;
+
+/**
+ The scale factor of the image.
+ 
+ @note For UIKit, this just call super instead.
+ @note For AppKit, `NSImage` can contains multiple image representations with different scales. However, this class does not do that from the design. We process the scale like UIKit. This will actually be calculated from image size and pixel size.
+ */
+@property (nonatomic, readonly) CGFloat scale;
+
+// By default, animated image frames are returned by decoding just in time without keeping into memory. But you can choose to preload them into memory as well, See the description in `SDAnimatedImage` protocol.
+// After preloaded, there is no huge difference on performance between this and UIImage's `animatedImageWithImages:duration:`. But UIImage's animation have some issues such like blanking and pausing during segue when using in `UIImageView`. It's recommend to use only if need.
+/**
+ Pre-load all animated image frame into memory. Then later frame image request can directly return the frame for index without decoding.
+ This method may be called on background thread.
+ 
+ @note If one image instance is shared by lots of imageViews, the CPU performance for large animated image will drop down because the request frame index will be random (not in order) and the decoder should take extra effort to keep it re-entrant. You can use this to reduce CPU usage if need. Attention this will consume more memory usage.
+ */
+- (void)preloadAllFrames;
+
+/**
+ Unload all animated image frame from memory if are already pre-loaded. Then later frame image request need decoding. You can use this to free up the memory usage if need.
+ */
+- (void)unloadAllFrames;
+/**
+ Returns a Boolean value indicating whether all animated image frames are already pre-loaded into memory.
+ */
+@property (nonatomic, assign, readonly, getter=isAllFramesLoaded) BOOL allFramesLoaded;
+/**
+ Return the animated image coder if the image is created with `initWithAnimatedCoder:scale:` method.
+ @note We use this with animated coder which conforms to `SDProgressiveImageCoder` for progressive animation decoding.
+ */
+@property (nonatomic, strong, readonly, nullable) id<SDAnimatedImageCoder> animatedCoder;
+
+@end
diff --git a/SDWebImage/Core/SDAnimatedImage.m b/SDWebImage/Core/SDAnimatedImage.m
new file mode 100644
index 000000000..4893e00b2
--- /dev/null
+++ b/SDWebImage/Core/SDAnimatedImage.m
@@ -0,0 +1,449 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDAnimatedImage.h"
+#import "NSImage+Compatibility.h"
+#import "SDImageCoder.h"
+#import "SDImageCodersManager.h"
+#import "SDImageFrame.h"
+#import "UIImage+MemoryCacheCost.h"
+#import "UIImage+Metadata.h"
+#import "UIImage+MultiFormat.h"
+#import "SDImageCoderHelper.h"
+#import "SDImageAssetManager.h"
+#import "objc/runtime.h"
+
+static CGFloat SDImageScaleFromPath(NSString *string) {
+    if (string.length == 0 || [string hasSuffix:@"/"]) return 1;
+    NSString *name = string.stringByDeletingPathExtension;
+    __block CGFloat scale = 1;
+    
+    NSRegularExpression *pattern = [NSRegularExpression regularExpressionWithPattern:@"@[0-9]+\\.?[0-9]*x$" options:NSRegularExpressionAnchorsMatchLines error:nil];
+    [pattern enumerateMatchesInString:name options:kNilOptions range:NSMakeRange(0, name.length) usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
+        scale = [string substringWithRange:NSMakeRange(result.range.location + 1, result.range.length - 2)].doubleValue;
+    }];
+    
+    return scale;
+}
+
+@interface SDAnimatedImage ()
+
+@property (nonatomic, strong) id<SDAnimatedImageCoder> animatedCoder;
+@property (atomic, copy) NSArray<SDImageFrame *> *loadedAnimatedImageFrames; // Mark as atomic to keep thread-safe
+@property (nonatomic, assign, getter=isAllFramesLoaded) BOOL allFramesLoaded;
+
+@end
+
+@implementation SDAnimatedImage
+@dynamic scale; // call super
+
+#pragma mark - UIImage override method
++ (instancetype)imageNamed:(NSString *)name {
+#if __has_include(<UIKit/UITraitCollection.h>) && !SD_WATCH
+    return [self imageNamed:name inBundle:nil compatibleWithTraitCollection:nil];
+#else
+    return [self imageNamed:name inBundle:nil];
+#endif
+}
+
+#if __has_include(<UIKit/UITraitCollection.h>) && !SD_WATCH
++ (instancetype)imageNamed:(NSString *)name inBundle:(NSBundle *)bundle compatibleWithTraitCollection:(UITraitCollection *)traitCollection {
+#if SD_VISION
+    if (!traitCollection) {
+        traitCollection = UITraitCollection.currentTraitCollection;
+    }
+#else
+    if (!traitCollection) {
+        traitCollection = UIScreen.mainScreen.traitCollection;
+    }
+#endif
+    CGFloat scale = traitCollection.displayScale;
+    return [self imageNamed:name inBundle:bundle scale:scale];
+}
+#else
++ (instancetype)imageNamed:(NSString *)name inBundle:(NSBundle *)bundle {
+    return [self imageNamed:name inBundle:bundle scale:0];
+}
+#endif
+
+// 0 scale means automatically check
++ (instancetype)imageNamed:(NSString *)name inBundle:(NSBundle *)bundle scale:(CGFloat)scale {
+    if (!name) {
+        return nil;
+    }
+    if (!bundle) {
+        bundle = [NSBundle mainBundle];
+    }
+    SDImageAssetManager *assetManager = [SDImageAssetManager sharedAssetManager];
+    SDAnimatedImage *image = (SDAnimatedImage *)[assetManager imageForName:name];
+    if ([image isKindOfClass:[SDAnimatedImage class]]) {
+        return image;
+    }
+    NSString *path = [assetManager getPathForName:name bundle:bundle preferredScale:&scale];
+    if (!path) {
+        return image;
+    }
+    NSData *data = [NSData dataWithContentsOfFile:path];
+    if (!data) {
+        return image;
+    }
+    image = [[self alloc] initWithData:data scale:scale];
+    if (image) {
+        [assetManager storeImage:image forName:name];
+    }
+    
+    return image;
+}
+
++ (instancetype)imageWithContentsOfFile:(NSString *)path {
+    return [[self alloc] initWithContentsOfFile:path];
+}
+
++ (instancetype)imageWithData:(NSData *)data {
+    return [[self alloc] initWithData:data];
+}
+
++ (instancetype)imageWithData:(NSData *)data scale:(CGFloat)scale {
+    return [[self alloc] initWithData:data scale:scale];
+}
+
+- (instancetype)initWithContentsOfFile:(NSString *)path {
+    NSData *data = [NSData dataWithContentsOfFile:path];
+    if (!data) {
+        return nil;
+    }
+    CGFloat scale = SDImageScaleFromPath(path);
+    // path extension may be useful for coder like raw-image
+    NSString *fileExtensionHint = path.pathExtension; // without dot
+    if (fileExtensionHint.length == 0) {
+        // Ignore file extension which is empty
+        fileExtensionHint = nil;
+    }
+    SDImageCoderMutableOptions *mutableCoderOptions = [NSMutableDictionary dictionaryWithCapacity:1];
+    mutableCoderOptions[SDImageCoderDecodeFileExtensionHint] = fileExtensionHint;
+    return [self initWithData:data scale:scale options:[mutableCoderOptions copy]];
+}
+
+- (instancetype)initWithData:(NSData *)data {
+    return [self initWithData:data scale:1];
+}
+
+- (instancetype)initWithData:(NSData *)data scale:(CGFloat)scale {
+    return [self initWithData:data scale:scale options:nil];
+}
+
+- (instancetype)initWithData:(NSData *)data scale:(CGFloat)scale options:(SDImageCoderOptions *)options {
+    if (!data || data.length == 0) {
+        return nil;
+    }
+    // Vector image does not supported, guard firstly
+    SDImageFormat format = [NSData sd_imageFormatForImageData:data];
+    if (format == SDImageFormatSVG || format == SDImageFormatPDF) {
+        return nil;
+    }
+    
+    id<SDAnimatedImageCoder> animatedCoder = nil;
+    SDImageCoderMutableOptions *mutableCoderOptions;
+    if (options != nil) {
+        mutableCoderOptions = [NSMutableDictionary dictionaryWithDictionary:options];
+    } else {
+        mutableCoderOptions = [NSMutableDictionary dictionaryWithCapacity:1];
+    }
+    mutableCoderOptions[SDImageCoderDecodeScaleFactor] = @(scale);
+    options = [mutableCoderOptions copy];
+    for (id<SDImageCoder>coder in [SDImageCodersManager sharedManager].coders.reverseObjectEnumerator) {
+        if ([coder conformsToProtocol:@protocol(SDAnimatedImageCoder)]) {
+            if ([coder canDecodeFromData:data]) {
+                animatedCoder = [[[coder class] alloc] initWithAnimatedImageData:data options:options];
+                break;
+            }
+        }
+    }
+    if (animatedCoder) {
+        // Animated Image
+        return [self initWithAnimatedCoder:animatedCoder scale:scale];
+    } else {
+        // Static Image (Before 5.19 this code path return nil)
+        UIImage *image = [[SDImageCodersManager sharedManager] decodedImageWithData:data options:options];
+        if (!image) {
+            return nil;
+        }
+        // Vector image does not supported, guard secondly
+        if (image.sd_isVector) {
+            return nil;
+        }
+#if SD_MAC
+        self = [super initWithCGImage:image.CGImage scale:MAX(scale, 1) orientation:kCGImagePropertyOrientationUp];
+#else
+        self = [super initWithCGImage:image.CGImage scale:MAX(scale, 1) orientation:image.imageOrientation];
+#endif
+        // Defines the associated object that holds the format for static images
+        super.sd_imageFormat = format;
+        return self;
+    }
+}
+
+- (instancetype)initWithAnimatedCoder:(id<SDAnimatedImageCoder>)animatedCoder scale:(CGFloat)scale {
+    if (!animatedCoder) {
+        return nil;
+    }
+    UIImage *image = [animatedCoder animatedImageFrameAtIndex:0];
+    if (!image) {
+        return nil;
+    }
+#if SD_MAC
+    self = [super initWithCGImage:image.CGImage scale:MAX(scale, 1) orientation:kCGImagePropertyOrientationUp];
+#else
+    self = [super initWithCGImage:image.CGImage scale:MAX(scale, 1) orientation:image.imageOrientation];
+#endif
+    if (self) {
+        // Only keep the animated coder if frame count > 1, save RAM usage for non-animated image format (APNG/WebP)
+        if (animatedCoder.animatedImageFrameCount > 1) {
+            _animatedCoder = animatedCoder;
+        }
+    }
+    return self;
+}
+
+- (SDImageFormat)animatedImageFormat {
+    return [NSData sd_imageFormatForImageData:self.animatedImageData];
+}
+
+#pragma mark - Preload
+- (void)preloadAllFrames {
+    if (!_animatedCoder) {
+        return;
+    }
+    if (!self.isAllFramesLoaded) {
+        NSMutableArray<SDImageFrame *> *frames = [NSMutableArray arrayWithCapacity:self.animatedImageFrameCount];
+        for (size_t i = 0; i < self.animatedImageFrameCount; i++) {
+            UIImage *image = [self animatedImageFrameAtIndex:i];
+            NSTimeInterval duration = [self animatedImageDurationAtIndex:i];
+            SDImageFrame *frame = [SDImageFrame frameWithImage:image duration:duration]; // through the image should be nonnull, used as nullable for `animatedImageFrameAtIndex:`
+            [frames addObject:frame];
+        }
+        self.loadedAnimatedImageFrames = frames;
+        self.allFramesLoaded = YES;
+    }
+}
+
+- (void)unloadAllFrames {
+    if (!_animatedCoder) {
+        return;
+    }
+    if (self.isAllFramesLoaded) {
+        self.loadedAnimatedImageFrames = nil;
+        self.allFramesLoaded = NO;
+    }
+}
+
+#pragma mark - NSSecureCoding
+- (instancetype)initWithCoder:(NSCoder *)aDecoder {
+    self = [super initWithCoder:aDecoder];
+    if (self) {
+        NSData *animatedImageData = [aDecoder decodeObjectOfClass:[NSData class] forKey:NSStringFromSelector(@selector(animatedImageData))];
+        if (!animatedImageData) {
+            return self;
+        }
+        CGFloat scale = self.scale;
+        id<SDAnimatedImageCoder> animatedCoder = nil;
+        for (id<SDImageCoder>coder in [SDImageCodersManager sharedManager].coders.reverseObjectEnumerator) {
+            if ([coder conformsToProtocol:@protocol(SDAnimatedImageCoder)]) {
+                if ([coder canDecodeFromData:animatedImageData]) {
+                    animatedCoder = [[[coder class] alloc] initWithAnimatedImageData:animatedImageData options:@{SDImageCoderDecodeScaleFactor : @(scale)}];
+                    break;
+                }
+            }
+        }
+        if (!animatedCoder) {
+            return self;
+        }
+        if (animatedCoder.animatedImageFrameCount > 1) {
+            _animatedCoder = animatedCoder;
+        }
+    }
+    return self;
+}
+
+- (void)encodeWithCoder:(NSCoder *)aCoder {
+    [super encodeWithCoder:aCoder];
+    NSData *animatedImageData = self.animatedImageData;
+    if (animatedImageData) {
+        [aCoder encodeObject:animatedImageData forKey:NSStringFromSelector(@selector(animatedImageData))];
+    }
+}
+
++ (BOOL)supportsSecureCoding {
+    return YES;
+}
+
+#pragma mark - SDAnimatedImageProvider
+
+- (NSData *)animatedImageData {
+    return [self.animatedCoder animatedImageData];
+}
+
+- (NSUInteger)animatedImageLoopCount {
+    return [self.animatedCoder animatedImageLoopCount];
+}
+
+- (NSUInteger)animatedImageFrameCount {
+    return [self.animatedCoder animatedImageFrameCount];
+}
+
+- (UIImage *)animatedImageFrameAtIndex:(NSUInteger)index {
+    if (index >= self.animatedImageFrameCount) {
+        return nil;
+    }
+    if (self.isAllFramesLoaded) {
+        SDImageFrame *frame = [self.loadedAnimatedImageFrames objectAtIndex:index];
+        return frame.image;
+    }
+    return [self.animatedCoder animatedImageFrameAtIndex:index];
+}
+
+- (NSTimeInterval)animatedImageDurationAtIndex:(NSUInteger)index {
+    if (index >= self.animatedImageFrameCount) {
+        return 0;
+    }
+    if (self.isAllFramesLoaded) {
+        SDImageFrame *frame = [self.loadedAnimatedImageFrames objectAtIndex:index];
+        return frame.duration;
+    }
+    return [self.animatedCoder animatedImageDurationAtIndex:index];
+}
+
+@end
+
+@implementation SDAnimatedImage (MemoryCacheCost)
+
+- (NSUInteger)sd_memoryCost {
+    NSNumber *value = objc_getAssociatedObject(self, @selector(sd_memoryCost));
+    if (value != nil) {
+        return value.unsignedIntegerValue;
+    }
+    
+    CGImageRef imageRef = self.CGImage;
+    if (!imageRef) {
+        return 0;
+    }
+    NSUInteger bytesPerFrame = CGImageGetBytesPerRow(imageRef) * CGImageGetHeight(imageRef);
+    NSUInteger frameCount = 1;
+    if (self.isAllFramesLoaded) {
+        frameCount = self.animatedImageFrameCount;
+    }
+    frameCount = frameCount > 0 ? frameCount : 1;
+    NSUInteger cost = bytesPerFrame * frameCount;
+    return cost;
+}
+
+@end
+
+@implementation SDAnimatedImage (Metadata)
+
+- (BOOL)sd_isAnimated {
+    return self.animatedImageFrameCount > 1;
+}
+
+- (NSUInteger)sd_imageLoopCount {
+    return self.animatedImageLoopCount;
+}
+
+- (void)setSd_imageLoopCount:(NSUInteger)sd_imageLoopCount {
+    return;
+}
+
+- (NSUInteger)sd_imageFrameCount {
+    NSUInteger frameCount = self.animatedImageFrameCount;
+    if (frameCount > 1) {
+        return frameCount;
+    } else {
+        return 1;
+    }
+}
+
+- (SDImageFormat)sd_imageFormat {
+    NSData *animatedImageData = self.animatedImageData;
+    if (animatedImageData) {
+        return [NSData sd_imageFormatForImageData:animatedImageData];
+    } else {
+        return [super sd_imageFormat];
+    }
+}
+
+- (BOOL)sd_isVector {
+    return NO;
+}
+
+@end
+
+@implementation SDAnimatedImage (MultiFormat)
+
++ (nullable UIImage *)sd_imageWithData:(nullable NSData *)data {
+    return [self sd_imageWithData:data scale:1];
+}
+
++ (nullable UIImage *)sd_imageWithData:(nullable NSData *)data scale:(CGFloat)scale {
+    return [self sd_imageWithData:data scale:scale firstFrameOnly:NO];
+}
+
++ (nullable UIImage *)sd_imageWithData:(nullable NSData *)data scale:(CGFloat)scale firstFrameOnly:(BOOL)firstFrameOnly {
+    if (!data) {
+        return nil;
+    }
+    return [[self alloc] initWithData:data scale:scale options:@{SDImageCoderDecodeFirstFrameOnly : @(firstFrameOnly)}];
+}
+
+- (nullable NSData *)sd_imageData {
+    NSData *imageData = self.animatedImageData;
+    if (imageData) {
+        return imageData;
+    } else {
+        return [self sd_imageDataAsFormat:self.animatedImageFormat];
+    }
+}
+
+- (nullable NSData *)sd_imageDataAsFormat:(SDImageFormat)imageFormat {
+    return [self sd_imageDataAsFormat:imageFormat compressionQuality:1];
+}
+
+- (nullable NSData *)sd_imageDataAsFormat:(SDImageFormat)imageFormat compressionQuality:(double)compressionQuality {
+    return [self sd_imageDataAsFormat:imageFormat compressionQuality:compressionQuality firstFrameOnly:NO];
+}
+
+- (nullable NSData *)sd_imageDataAsFormat:(SDImageFormat)imageFormat compressionQuality:(double)compressionQuality firstFrameOnly:(BOOL)firstFrameOnly {
+    // Protect when user input the imageFormat == self.animatedImageFormat && compressionQuality == 1
+    // This should be treated as grabbing `self.animatedImageData` as well :)
+    NSData *imageData;
+    if (imageFormat == self.animatedImageFormat && compressionQuality == 1) {
+        imageData = self.animatedImageData;
+    }
+    if (imageData) return imageData;
+    
+    SDImageCoderOptions *options = @{SDImageCoderEncodeCompressionQuality : @(compressionQuality), SDImageCoderEncodeFirstFrameOnly : @(firstFrameOnly)};
+    NSUInteger frameCount = self.animatedImageFrameCount;
+    if (frameCount <= 1) {
+        // Static image
+        imageData = [SDImageCodersManager.sharedManager encodedDataWithImage:self format:imageFormat options:options];
+    }
+    if (imageData) return imageData;
+    
+    NSUInteger loopCount = self.animatedImageLoopCount;
+    // Keep animated image encoding, loop each frame.
+    NSMutableArray<SDImageFrame *> *frames = [NSMutableArray arrayWithCapacity:frameCount];
+    for (size_t i = 0; i < frameCount; i++) {
+        UIImage *image = [self animatedImageFrameAtIndex:i];
+        NSTimeInterval duration = [self animatedImageDurationAtIndex:i];
+        SDImageFrame *frame = [SDImageFrame frameWithImage:image duration:duration];
+        [frames addObject:frame];
+    }
+    imageData = [SDImageCodersManager.sharedManager encodedDataWithFrames:frames loopCount:loopCount format:imageFormat options:options];
+    return imageData;
+}
+
+@end
diff --git a/SDWebImage/Core/SDAnimatedImagePlayer.h b/SDWebImage/Core/SDAnimatedImagePlayer.h
new file mode 100644
index 000000000..77e041ac2
--- /dev/null
+++ b/SDWebImage/Core/SDAnimatedImagePlayer.h
@@ -0,0 +1,113 @@
+/*
+* This file is part of the SDWebImage package.
+* (c) Olivier Poitrey <rs@dailymotion.com>
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code.
+*/
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCompat.h"
+#import "SDImageCoder.h"
+
+/// Animated image playback mode
+typedef NS_ENUM(NSUInteger, SDAnimatedImagePlaybackMode) {
+    /**
+     * From first to last frame and stop or next loop.
+     */
+    SDAnimatedImagePlaybackModeNormal = 0,
+    /**
+     * From last frame to first frame and stop or next loop.
+     */
+    SDAnimatedImagePlaybackModeReverse,
+    /**
+     * From first frame to last frame and reverse again, like reciprocating.
+     */
+    SDAnimatedImagePlaybackModeBounce,
+    /**
+     * From last frame to first frame and reverse again, like reversed reciprocating.
+     */
+    SDAnimatedImagePlaybackModeReversedBounce,
+};
+
+/// A player to control the playback of animated image, which can be used to drive Animated ImageView or any rendering usage, like CALayer/WatchKit/SwiftUI rendering.
+@interface SDAnimatedImagePlayer : NSObject
+
+/// Current playing frame image. This value is KVO Compliance.
+@property (nonatomic, readonly, nullable) UIImage *currentFrame;
+
+/// Current frame index, zero based. This value is KVO Compliance.
+@property (nonatomic, readonly) NSUInteger currentFrameIndex;
+
+/// Current loop count since its latest animating. This value is KVO Compliance.
+@property (nonatomic, readonly) NSUInteger currentLoopCount;
+
+/// Total frame count for animated image rendering. Defaults is animated image's frame count.
+/// @note For progressive animation, you can update this value when your provider receive more frames.
+@property (nonatomic, assign) NSUInteger totalFrameCount;
+
+/// Total loop count for animated image rendering. Default is animated image's loop count.
+@property (nonatomic, assign) NSUInteger totalLoopCount;
+
+/// The animation playback rate. Default is 1.0
+/// `1.0` means the normal speed.
+/// `0.0` means stopping the animation.
+/// `0.0-1.0` means the slow speed.
+/// `> 1.0` means the fast speed.
+/// `< 0.0` is not supported currently and stop animation. (may support reverse playback in the future)
+@property (nonatomic, assign) double playbackRate;
+
+/// Asynchronous setup animation playback mode. Default mode is SDAnimatedImagePlaybackModeNormal.
+@property (nonatomic, assign) SDAnimatedImagePlaybackMode playbackMode;
+
+/// Provide a max buffer size by bytes. This is used to adjust frame buffer count and can be useful when the decoding cost is expensive (such as Animated WebP software decoding). Default is 0.
+/// `0` means automatically adjust by calculating current memory usage.
+/// `1` means without any buffer cache, each of frames will be decoded and then be freed after rendering. (Lowest Memory and Highest CPU)
+/// `NSUIntegerMax` means cache all the buffer. (Lowest CPU and Highest Memory)
+@property (nonatomic, assign) NSUInteger maxBufferSize;
+
+/// You can specify a runloop mode to let it rendering.
+/// Default is NSRunLoopCommonModes on multi-core device, NSDefaultRunLoopMode on single-core device
+@property (nonatomic, copy, nonnull) NSRunLoopMode runLoopMode;
+
+/// Create a player with animated image provider. If the provider's `animatedImageFrameCount` is less than 1, returns nil.
+/// The provider can be any protocol implementation, like `SDAnimatedImage`, `SDImageGIFCoder`, etc.
+/// @note This provider can represent mutable content, like progressive animated loading. But you need to update the frame count by yourself
+/// @param provider The animated provider
+- (nullable instancetype)initWithProvider:(nonnull id<SDAnimatedImageProvider>)provider;
+
+/// Create a player with animated image provider. If the provider's `animatedImageFrameCount` is less than 1, returns nil.
+/// The provider can be any protocol implementation, like `SDAnimatedImage` or `SDImageGIFCoder`, etc.
+/// @note This provider can represent mutable content, like progressive animated loading. But you need to update the frame count by yourself
+/// @param provider The animated provider
++ (nullable instancetype)playerWithProvider:(nonnull id<SDAnimatedImageProvider>)provider;
+
+/// The handler block when current frame and index changed.
+@property (nonatomic, copy, nullable) void (^animationFrameHandler)(NSUInteger index, UIImage * _Nonnull frame);
+
+/// The handler block when one loop count finished.
+@property (nonatomic, copy, nullable) void (^animationLoopHandler)(NSUInteger loopCount);
+
+/// Return the status whether animation is playing.
+@property (nonatomic, readonly) BOOL isPlaying;
+
+/// Start the animation. Or resume the previously paused animation.
+- (void)startPlaying;
+
+/// Pause the animation. Keep the current frame index and loop count.
+- (void)pausePlaying;
+
+/// Stop the animation. Reset the current frame index and loop count.
+- (void)stopPlaying;
+
+/// Seek to the desired frame index and loop count.
+/// @note This can be used for advanced control like progressive loading, or skipping specify frames.
+/// @param index The frame index
+/// @param loopCount The loop count
+- (void)seekToFrameAtIndex:(NSUInteger)index loopCount:(NSUInteger)loopCount;
+
+/// Clear the frame cache buffer. The frame cache buffer size can be controlled by `maxBufferSize`.
+/// By default, when stop or pause the animation, the frame buffer is still kept to ready for the next restart
+- (void)clearFrameBuffer;
+
+@end
diff --git a/SDWebImage/Core/SDAnimatedImagePlayer.m b/SDWebImage/Core/SDAnimatedImagePlayer.m
new file mode 100644
index 000000000..499be6759
--- /dev/null
+++ b/SDWebImage/Core/SDAnimatedImagePlayer.m
@@ -0,0 +1,355 @@
+/*
+* This file is part of the SDWebImage package.
+* (c) Olivier Poitrey <rs@dailymotion.com>
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code.
+*/
+
+#import "SDAnimatedImagePlayer.h"
+#import "NSImage+Compatibility.h"
+#import "SDDisplayLink.h"
+#import "SDDeviceHelper.h"
+#import "SDImageFramePool.h"
+#import "SDInternalMacros.h"
+
+@interface SDAnimatedImagePlayer () {
+    NSRunLoopMode _runLoopMode;
+}
+
+@property (nonatomic, strong) SDImageFramePool *framePool;
+
+@property (nonatomic, strong, readwrite) UIImage *currentFrame;
+@property (nonatomic, assign, readwrite) NSUInteger currentFrameIndex;
+@property (nonatomic, assign, readwrite) NSUInteger currentLoopCount;
+@property (nonatomic, strong) id<SDAnimatedImageProvider> animatedProvider;
+@property (nonatomic, assign) NSUInteger currentFrameBytes;
+@property (nonatomic, assign) NSTimeInterval currentTime;
+@property (nonatomic, assign) BOOL bufferMiss;
+@property (nonatomic, assign) BOOL needsDisplayWhenImageBecomesAvailable;
+@property (nonatomic, assign) BOOL shouldReverse;
+@property (nonatomic, strong) SDDisplayLink *displayLink;
+
+@end
+
+@implementation SDAnimatedImagePlayer
+
+- (instancetype)initWithProvider:(id<SDAnimatedImageProvider>)provider {
+    self = [super init];
+    if (self) {
+        NSUInteger animatedImageFrameCount = provider.animatedImageFrameCount;
+        // Check the frame count
+        if (animatedImageFrameCount <= 1) {
+            return nil;
+        }
+        self.totalFrameCount = animatedImageFrameCount;
+        // Get the current frame and loop count.
+        self.totalLoopCount = provider.animatedImageLoopCount;
+        self.animatedProvider = provider;
+        self.playbackRate = 1.0;
+        self.framePool = [SDImageFramePool registerProvider:provider];
+    }
+    return self;
+}
+
++ (instancetype)playerWithProvider:(id<SDAnimatedImageProvider>)provider {
+    SDAnimatedImagePlayer *player = [[SDAnimatedImagePlayer alloc] initWithProvider:provider];
+    return player;
+}
+
+- (void)dealloc {
+    // Dereference the frame pool, when zero the frame pool for provider will dealloc
+    [SDImageFramePool unregisterProvider:self.animatedProvider];
+}
+
+#pragma mark - Private
+
+- (SDDisplayLink *)displayLink {
+    if (!_displayLink) {
+        _displayLink = [SDDisplayLink displayLinkWithTarget:self selector:@selector(displayDidRefresh:)];
+        [_displayLink addToRunLoop:[NSRunLoop mainRunLoop] forMode:self.runLoopMode];
+        [_displayLink stop];
+    }
+    return _displayLink;
+}
+
+- (void)setRunLoopMode:(NSRunLoopMode)runLoopMode {
+    if ([_runLoopMode isEqual:runLoopMode]) {
+        return;
+    }
+    if (_displayLink) {
+        if (_runLoopMode) {
+            [_displayLink removeFromRunLoop:[NSRunLoop mainRunLoop] forMode:_runLoopMode];
+        }
+        if (runLoopMode.length > 0) {
+            [_displayLink addToRunLoop:[NSRunLoop mainRunLoop] forMode:runLoopMode];
+        }
+    }
+    _runLoopMode = [runLoopMode copy];
+}
+
+- (NSRunLoopMode)runLoopMode {
+    if (!_runLoopMode) {
+        _runLoopMode = [[self class] defaultRunLoopMode];
+    }
+    return _runLoopMode;
+}
+
+#pragma mark - State Control
+
+- (void)setupCurrentFrame {
+    if (self.currentFrameIndex != 0) {
+        return;
+    }
+    if (self.playbackMode == SDAnimatedImagePlaybackModeReverse ||
+               self.playbackMode == SDAnimatedImagePlaybackModeReversedBounce) {
+        self.currentFrameIndex = self.totalFrameCount - 1;
+    }
+    
+    if (!self.currentFrame && [self.animatedProvider isKindOfClass:[UIImage class]]) {
+        UIImage *image = (UIImage *)self.animatedProvider;
+        // Cache the poster image if available, but should not callback to avoid caller thread issues
+        #if SD_MAC
+        UIImage *posterFrame = [[NSImage alloc] initWithCGImage:image.CGImage scale:image.scale orientation:kCGImagePropertyOrientationUp];
+        #else
+        UIImage *posterFrame = [[UIImage alloc] initWithCGImage:image.CGImage scale:image.scale orientation:image.imageOrientation];
+        #endif
+        if (posterFrame) {
+            // Calculate max buffer size
+            [self calculateMaxBufferCountWithFrame:posterFrame];
+            // HACK: The first frame should not check duration and immediately display
+            self.needsDisplayWhenImageBecomesAvailable = YES;
+            [self.framePool setFrame:posterFrame atIndex:self.currentFrameIndex];
+        }
+    }
+    
+}
+
+- (void)resetCurrentFrameStatus {
+    // These should not trigger KVO, user don't need to receive an `index == 0, image == nil` callback.
+    _currentFrame = nil;
+    _currentFrameIndex = 0;
+    _currentLoopCount = 0;
+    _currentTime = 0;
+    _bufferMiss = NO;
+    _needsDisplayWhenImageBecomesAvailable = NO;
+}
+
+- (void)clearFrameBuffer {
+    [self.framePool removeAllFrames];
+}
+
+#pragma mark - Animation Control
+- (void)startPlaying {
+    [self.displayLink start];
+    // Setup frame
+    [self setupCurrentFrame];
+}
+
+- (void)stopPlaying {
+    // Using `_displayLink` here because when UIImageView dealloc, it may trigger `[self stopAnimating]`, we already release the display link in SDAnimatedImageView's dealloc method.
+    [_displayLink stop];
+    // We need to reset the frame status, but not trigger any handle. This can ensure next time's playing status correct.
+    [self resetCurrentFrameStatus];
+}
+
+- (void)pausePlaying {
+    [_displayLink stop];
+}
+
+- (BOOL)isPlaying {
+    return _displayLink.isRunning;
+}
+
+- (void)seekToFrameAtIndex:(NSUInteger)index loopCount:(NSUInteger)loopCount {
+    if (index >= self.totalFrameCount) {
+        return;
+    }
+    self.currentFrameIndex = index;
+    self.currentLoopCount = loopCount;
+    self.currentFrame = [self.animatedProvider animatedImageFrameAtIndex:index];
+    [self handleFrameChange];
+}
+
+#pragma mark - Core Render
+- (void)displayDidRefresh:(SDDisplayLink *)displayLink {
+    // If for some reason a wild call makes it through when we shouldn't be animating, bail.
+    // Early return!
+    if (!self.isPlaying) {
+        return;
+    }
+    
+    NSUInteger totalFrameCount = self.totalFrameCount;
+    if (totalFrameCount <= 1) {
+        // Total frame count less than 1, wrong configuration and stop animating
+        [self stopPlaying];
+        return;
+    }
+    
+    NSTimeInterval playbackRate = self.playbackRate;
+    if (playbackRate <= 0) {
+        // Does not support <= 0 play rate
+        [self stopPlaying];
+        return;
+    }
+    
+    // Calculate refresh duration
+    NSTimeInterval duration = self.displayLink.duration;
+    
+    NSUInteger currentFrameIndex = self.currentFrameIndex;
+    NSUInteger nextFrameIndex = (currentFrameIndex + 1) % totalFrameCount;
+    
+    if (self.playbackMode == SDAnimatedImagePlaybackModeReverse) {
+        nextFrameIndex = currentFrameIndex == 0 ? (totalFrameCount - 1) : (currentFrameIndex - 1) % totalFrameCount;
+        
+    } else if (self.playbackMode == SDAnimatedImagePlaybackModeBounce ||
+               self.playbackMode == SDAnimatedImagePlaybackModeReversedBounce) {
+        if (currentFrameIndex == 0) {
+            self.shouldReverse = NO;
+        } else if (currentFrameIndex == totalFrameCount - 1) {
+            self.shouldReverse = YES;
+        }
+        nextFrameIndex = self.shouldReverse ? (currentFrameIndex - 1) : (currentFrameIndex + 1);
+        nextFrameIndex %= totalFrameCount;
+    }
+    
+    
+    // Check if we need to display new frame firstly
+    if (self.needsDisplayWhenImageBecomesAvailable) {
+        UIImage *currentFrame = [self.framePool frameAtIndex:currentFrameIndex];
+        
+        // Update the current frame
+        if (currentFrame) {
+            // Update the current frame immediately
+            self.currentFrame = currentFrame;
+            [self handleFrameChange];
+            
+            self.bufferMiss = NO;
+            self.needsDisplayWhenImageBecomesAvailable = NO;
+        }
+        else {
+            self.bufferMiss = YES;
+        }
+    }
+    
+    // Check if we have the frame buffer
+    if (!self.bufferMiss) {
+        // Then check if timestamp is reached
+        self.currentTime += duration;
+        NSTimeInterval currentDuration = [self.animatedProvider animatedImageDurationAtIndex:currentFrameIndex];
+        currentDuration = currentDuration / playbackRate;
+        if (self.currentTime < currentDuration) {
+            // Current frame timestamp not reached, prefetch frame in advance.
+            [self prefetchFrameAtIndex:currentFrameIndex
+                             nextIndex:nextFrameIndex];
+            return;
+        }
+        
+        // Otherwise, we should be ready to display next frame
+        self.needsDisplayWhenImageBecomesAvailable = YES;
+        self.currentFrameIndex = nextFrameIndex;
+        self.currentTime -= currentDuration;
+        NSTimeInterval nextDuration = [self.animatedProvider animatedImageDurationAtIndex:nextFrameIndex];
+        nextDuration = nextDuration / playbackRate;
+        if (self.currentTime > nextDuration) {
+            // Do not skip frame
+            self.currentTime = nextDuration;
+        }
+        
+        // Update the loop count when last frame rendered
+        if (nextFrameIndex == 0) {
+            // Update the loop count
+            self.currentLoopCount++;
+            [self handleLoopChange];
+            
+            // if reached the max loop count, stop animating, 0 means loop indefinitely
+            NSUInteger maxLoopCount = self.totalLoopCount;
+            if (maxLoopCount != 0 && (self.currentLoopCount >= maxLoopCount)) {
+                [self stopPlaying];
+                return;
+            }
+        }
+    }
+    
+    // Since we support handler, check animating state again
+    if (!self.isPlaying) {
+        return;
+    }
+    
+    [self prefetchFrameAtIndex:currentFrameIndex
+                     nextIndex:nextFrameIndex];
+}
+
+// Check if we should prefetch next frame or current frame
+// When buffer miss, means the decode speed is slower than render speed, we fetch current miss frame
+// Or, most cases, the decode speed is faster than render speed, we fetch next frame
+- (void)prefetchFrameAtIndex:(NSUInteger)currentIndex
+                   nextIndex:(NSUInteger)nextIndex {
+    NSUInteger fetchFrameIndex = currentIndex;
+    UIImage *fetchFrame = nil;
+    if (!self.bufferMiss) {
+        fetchFrameIndex = nextIndex;
+        fetchFrame = [self.framePool frameAtIndex:nextIndex];
+    }
+    BOOL bufferFull = NO;
+    if (self.framePool.currentFrameCount == self.totalFrameCount) {
+        bufferFull = YES;
+    }
+    if (!fetchFrame && !bufferFull) {
+        // Calculate max buffer size
+        [self calculateMaxBufferCountWithFrame:self.currentFrame];
+        // Prefetch next frame
+        [self.framePool prefetchFrameAtIndex:fetchFrameIndex];
+    }
+}
+
+- (void)handleFrameChange {
+    if (self.animationFrameHandler) {
+        self.animationFrameHandler(self.currentFrameIndex, self.currentFrame);
+    }
+}
+
+- (void)handleLoopChange {
+    if (self.animationLoopHandler) {
+        self.animationLoopHandler(self.currentLoopCount);
+    }
+}
+
+#pragma mark - Util
+- (void)calculateMaxBufferCountWithFrame:(nonnull UIImage *)frame {
+    NSUInteger bytes = self.currentFrameBytes;
+    if (bytes == 0) {
+        bytes = CGImageGetBytesPerRow(frame.CGImage) * CGImageGetHeight(frame.CGImage);
+        if (bytes == 0) {
+            bytes = 1024;
+        } else {
+            // Cache since most animated image each frame bytes is the same
+            self.currentFrameBytes = bytes;
+        }
+    }
+    
+    NSUInteger max = 0;
+    if (self.maxBufferSize > 0) {
+        max = self.maxBufferSize;
+    } else {
+        // Calculate based on current memory, these factors are by experience
+        NSUInteger total = [SDDeviceHelper totalMemory];
+        NSUInteger free = [SDDeviceHelper freeMemory];
+        max = MIN(total * 0.2, free * 0.6);
+    }
+    
+    NSUInteger maxBufferCount = (double)max / (double)bytes;
+    if (!maxBufferCount) {
+        // At least 1 frame
+        maxBufferCount = 1;
+    }
+    
+    self.framePool.maxBufferCount = maxBufferCount;
+}
+
++ (NSString *)defaultRunLoopMode {
+    // Key off `activeProcessorCount` (as opposed to `processorCount`) since the system could shut down cores in certain situations.
+    return [NSProcessInfo processInfo].activeProcessorCount > 1 ? NSRunLoopCommonModes : NSDefaultRunLoopMode;
+}
+
+@end
diff --git a/SDWebImage/Core/SDAnimatedImageRep.h b/SDWebImage/Core/SDAnimatedImageRep.h
new file mode 100644
index 000000000..dec2fbd57
--- /dev/null
+++ b/SDWebImage/Core/SDAnimatedImageRep.h
@@ -0,0 +1,33 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+
+#if SD_MAC
+
+#import "NSData+ImageContentType.h"
+
+/**
+ A subclass of `NSBitmapImageRep` to fix that GIF duration issue because `NSBitmapImageRep` will reset `NSImageCurrentFrameDuration` by using `kCGImagePropertyGIFDelayTime` but not `kCGImagePropertyGIFUnclampedDelayTime`.
+ This also fix the GIF loop count issue, which will use the Netscape standard (See http://www6.uniovi.es/gifanim/gifabout.htm)  to only place once when the `kCGImagePropertyGIFLoopCount` is nil. This is what modern browser's behavior.
+ Built in GIF coder use this instead of `NSBitmapImageRep` for better GIF rendering. If you do not want this, only enable `SDImageIOCoder`, which just call `NSImage` API and actually use `NSBitmapImageRep` for GIF image.
+ This also support APNG format using `SDImageAPNGCoder`. Which provide full alpha-channel support and the correct duration match the `kCGImagePropertyAPNGUnclampedDelayTime`.
+ */
+@interface SDAnimatedImageRep : NSBitmapImageRep
+
+/// Current animated image format.
+/// @note This format is only valid when `animatedImageData` not nil
+@property (nonatomic, assign, readonly) SDImageFormat animatedImageFormat;
+
+/// This allows to retrive the compressed data like GIF using `sd_imageData` on parent `NSImage`, without re-encoding (waste CPU and RAM)
+/// @note This is typically nonnull when you create with `initWithData:`, even it's marked as weak, because ImageIO retain it
+@property (nonatomic, readonly, nullable, weak) NSData *animatedImageData;
+
+@end
+
+#endif
diff --git a/SDWebImage/Core/SDAnimatedImageRep.m b/SDWebImage/Core/SDAnimatedImageRep.m
new file mode 100644
index 000000000..043f335e5
--- /dev/null
+++ b/SDWebImage/Core/SDAnimatedImageRep.m
@@ -0,0 +1,151 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDAnimatedImageRep.h"
+
+#if SD_MAC
+
+#import "SDImageIOAnimatedCoderInternal.h"
+#import "SDImageGIFCoder.h"
+#import "SDImageAPNGCoder.h"
+#import "SDImageHEICCoder.h"
+#import "SDImageAWebPCoder.h"
+
+@interface SDAnimatedImageRep ()
+/// This wrap the animated image frames for legacy animated image coder API (`encodedDataWithImage:`).
+@property (nonatomic, readwrite, weak) NSArray<SDImageFrame *> *frames;
+@property (nonatomic, assign, readwrite) SDImageFormat animatedImageFormat;
+@end
+
+@implementation SDAnimatedImageRep {
+    CGImageSourceRef _imageSource;
+}
+
+- (void)dealloc {
+    if (_imageSource) {
+        CFRelease(_imageSource);
+        _imageSource = NULL;
+    }
+}
+
+- (instancetype)copyWithZone:(NSZone *)zone {
+    SDAnimatedImageRep *imageRep = [super copyWithZone:zone];
+    // super will copy all ivars
+    if (imageRep->_imageSource) {
+        CFRetain(imageRep->_imageSource);
+    }
+    return imageRep;
+}
+
+// `NSBitmapImageRep`'s `imageRepWithData:` is not designed initializer
++ (instancetype)imageRepWithData:(NSData *)data {
+    SDAnimatedImageRep *imageRep = [[SDAnimatedImageRep alloc] initWithData:data];
+    return imageRep;
+}
+
+// We should override init method for `NSBitmapImageRep` to do initialize about animated image format
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunguarded-availability"
+- (instancetype)initWithData:(NSData *)data {
+    self = [super initWithData:data];
+    if (self) {
+        CGImageSourceRef imageSource = CGImageSourceCreateWithData((__bridge CFDataRef) data, NULL);
+        if (!imageSource) {
+            return self;
+        }
+        _imageSource = imageSource;
+        NSUInteger frameCount = CGImageSourceGetCount(imageSource);
+        if (frameCount <= 1) {
+            return self;
+        }
+        CFStringRef type = CGImageSourceGetType(imageSource);
+        if (!type) {
+            return self;
+        }
+        _animatedImageData = data; // CGImageSource will retain the data internally, no extra copy
+        SDImageFormat format = SDImageFormatUndefined;
+        if (CFStringCompare(type, kSDUTTypeGIF, 0) == kCFCompareEqualTo) {
+            // GIF
+            // Fix the `NSBitmapImageRep` GIF loop count calculation issue
+            // Which will use 0 when there are no loop count information metadata in GIF data
+            format = SDImageFormatGIF;
+            NSUInteger loopCount = [SDImageGIFCoder imageLoopCountWithSource:imageSource];
+            [self setProperty:NSImageLoopCount withValue:@(loopCount)];
+        } else if (CFStringCompare(type, kSDUTTypePNG, 0) == kCFCompareEqualTo) {
+            // APNG
+            // Do initialize about frame count, current frame/duration and loop count
+            format = SDImageFormatPNG;
+            [self setProperty:NSImageFrameCount withValue:@(frameCount)];
+            [self setProperty:NSImageCurrentFrame withValue:@(0)];
+            NSUInteger loopCount = [SDImageAPNGCoder imageLoopCountWithSource:imageSource];
+            [self setProperty:NSImageLoopCount withValue:@(loopCount)];
+        } else if (CFStringCompare(type, kSDUTTypeHEICS, 0) == kCFCompareEqualTo) {
+            // HEIC
+            // Do initialize about frame count, current frame/duration and loop count
+            format = SDImageFormatHEIC;
+            [self setProperty:NSImageFrameCount withValue:@(frameCount)];
+            [self setProperty:NSImageCurrentFrame withValue:@(0)];
+            NSUInteger loopCount = [SDImageHEICCoder imageLoopCountWithSource:imageSource];
+            [self setProperty:NSImageLoopCount withValue:@(loopCount)];
+        } else if (CFStringCompare(type, kSDUTTypeWebP, 0) == kCFCompareEqualTo) {
+            // WebP
+            // Do initialize about frame count, current frame/duration and loop count
+            format = SDImageFormatWebP;
+            [self setProperty:NSImageFrameCount withValue:@(frameCount)];
+            [self setProperty:NSImageCurrentFrame withValue:@(0)];
+            NSUInteger loopCount = [SDImageAWebPCoder imageLoopCountWithSource:imageSource];
+            [self setProperty:NSImageLoopCount withValue:@(loopCount)];
+        } else {
+            format = [NSData sd_imageFormatForImageData:data];
+        }
+        _animatedImageFormat = format;
+    }
+    return self;
+}
+
+// `NSBitmapImageRep` will use `kCGImagePropertyGIFDelayTime` whenever you call `setProperty:withValue:` with `NSImageCurrentFrame` to change the current frame. We override it and use the actual `kCGImagePropertyGIFUnclampedDelayTime` if need.
+- (void)setProperty:(NSBitmapImageRepPropertyKey)property withValue:(id)value {
+    [super setProperty:property withValue:value];
+    if ([property isEqualToString:NSImageCurrentFrame]) {
+        // Access the image source
+        CGImageSourceRef imageSource = _imageSource;
+        if (!imageSource) {
+            return;
+        }
+        // Check format type
+        CFStringRef type = CGImageSourceGetType(imageSource);
+        if (!type) {
+            return;
+        }
+        NSUInteger index = [value unsignedIntegerValue];
+        NSTimeInterval frameDuration = 0;
+        if (CFStringCompare(type, kSDUTTypeGIF, 0) == kCFCompareEqualTo) {
+            // GIF
+            frameDuration = [SDImageGIFCoder frameDurationAtIndex:index source:imageSource];
+        } else if (CFStringCompare(type, kSDUTTypePNG, 0) == kCFCompareEqualTo) {
+            // APNG
+            frameDuration = [SDImageAPNGCoder frameDurationAtIndex:index source:imageSource];
+        } else if (CFStringCompare(type, kSDUTTypeHEICS, 0) == kCFCompareEqualTo) {
+            // HEIC
+            frameDuration = [SDImageHEICCoder frameDurationAtIndex:index source:imageSource];
+        } else if (CFStringCompare(type, kSDUTTypeWebP, 0) == kCFCompareEqualTo) {
+            // WebP
+            frameDuration = [SDImageAWebPCoder frameDurationAtIndex:index source:imageSource];
+        }
+        if (!frameDuration) {
+            return;
+        }
+        // Reset super frame duration with the actual frame duration
+        [super setProperty:NSImageCurrentFrameDuration withValue:@(frameDuration)];
+    }
+}
+#pragma clang diagnostic pop
+
+@end
+
+#endif
diff --git a/SDWebImage/UIButton+WebCache.h b/SDWebImage/Core/SDAnimatedImageView+WebCache.h
similarity index 53%
rename from SDWebImage/UIButton+WebCache.h
rename to SDWebImage/Core/SDAnimatedImageView+WebCache.h
index 61fada621..af4647648 100644
--- a/SDWebImage/UIButton+WebCache.h
+++ b/SDWebImage/Core/SDAnimatedImageView+WebCache.h
@@ -6,41 +6,25 @@
  * file that was distributed with this source code.
  */
 
-#import "SDWebImageCompat.h"
+#import "SDAnimatedImageView.h"
 
-#if SD_UIKIT
+#if SD_UIKIT || SD_MAC
 
 #import "SDWebImageManager.h"
 
 /**
- * Integrates SDWebImage async downloading and caching of remote images with UIButtonView.
+ Integrates SDWebImage async downloading and caching of remote images with SDAnimatedImageView.
  */
-@interface UIButton (WebCache)
-
-#pragma mark - Image
-
-/**
- * Get the current image URL.
- */
-- (nullable NSURL *)sd_currentImageURL;
-
-/**
- * Get the image URL for a control state.
- * 
- * @param state Which state you want to know the URL for. The values are described in UIControlState.
- */
-- (nullable NSURL *)sd_imageURLForState:(UIControlState)state;
+@interface SDAnimatedImageView (WebCache)
 
 /**
  * Set the imageView `image` with an `url`.
  *
  * The download is asynchronous and cached.
  *
- * @param url   The url for the image.
- * @param state The state that uses the specified title. The values are described in UIControlState.
+ * @param url The url for the image.
  */
-- (void)sd_setImageWithURL:(nullable NSURL *)url
-                  forState:(UIControlState)state NS_REFINED_FOR_SWIFT;
+- (void)sd_setImageWithURL:(nullable NSURL *)url NS_REFINED_FOR_SWIFT;
 
 /**
  * Set the imageView `image` with an `url` and a placeholder.
@@ -48,12 +32,10 @@
  * The download is asynchronous and cached.
  *
  * @param url         The url for the image.
- * @param state       The state that uses the specified title. The values are described in UIControlState.
  * @param placeholder The image to be set initially, until the image request finishes.
  * @see sd_setImageWithURL:placeholderImage:options:
  */
 - (void)sd_setImageWithURL:(nullable NSURL *)url
-                  forState:(UIControlState)state
           placeholderImage:(nullable UIImage *)placeholder NS_REFINED_FOR_SWIFT;
 
 /**
@@ -62,22 +44,34 @@
  * The download is asynchronous and cached.
  *
  * @param url         The url for the image.
- * @param state       The state that uses the specified title. The values are described in UIControlState.
  * @param placeholder The image to be set initially, until the image request finishes.
  * @param options     The options to use when downloading the image. @see SDWebImageOptions for the possible values.
  */
 - (void)sd_setImageWithURL:(nullable NSURL *)url
-                  forState:(UIControlState)state
           placeholderImage:(nullable UIImage *)placeholder
                    options:(SDWebImageOptions)options NS_REFINED_FOR_SWIFT;
 
+/**
+ * Set the imageView `image` with an `url`, placeholder, custom options and context.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url         The url for the image.
+ * @param placeholder The image to be set initially, until the image request finishes.
+ * @param options     The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param context     A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+          placeholderImage:(nullable UIImage *)placeholder
+                   options:(SDWebImageOptions)options
+                   context:(nullable SDWebImageContext *)context;
+
 /**
  * Set the imageView `image` with an `url`.
  *
  * The download is asynchronous and cached.
  *
  * @param url            The url for the image.
- * @param state          The state that uses the specified title. The values are described in UIControlState.
  * @param completedBlock A block called when operation has been completed. This block has no return value
  *                       and takes the requested UIImage as first parameter. In case of error the image parameter
  *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
@@ -85,7 +79,6 @@
  *                       The fourth parameter is the original image url.
  */
 - (void)sd_setImageWithURL:(nullable NSURL *)url
-                  forState:(UIControlState)state
                  completed:(nullable SDExternalCompletionBlock)completedBlock;
 
 /**
@@ -94,7 +87,6 @@
  * The download is asynchronous and cached.
  *
  * @param url            The url for the image.
- * @param state          The state that uses the specified title. The values are described in UIControlState.
  * @param placeholder    The image to be set initially, until the image request finishes.
  * @param completedBlock A block called when operation has been completed. This block has no return value
  *                       and takes the requested UIImage as first parameter. In case of error the image parameter
@@ -103,7 +95,6 @@
  *                       The fourth parameter is the original image url.
  */
 - (void)sd_setImageWithURL:(nullable NSURL *)url
-                  forState:(UIControlState)state
           placeholderImage:(nullable UIImage *)placeholder
                  completed:(nullable SDExternalCompletionBlock)completedBlock NS_REFINED_FOR_SWIFT;
 
@@ -113,7 +104,6 @@
  * The download is asynchronous and cached.
  *
  * @param url            The url for the image.
- * @param state          The state that uses the specified title. The values are described in UIControlState.
  * @param placeholder    The image to be set initially, until the image request finishes.
  * @param options        The options to use when downloading the image. @see SDWebImageOptions for the possible values.
  * @param completedBlock A block called when operation has been completed. This block has no return value
@@ -123,132 +113,55 @@
  *                       The fourth parameter is the original image url.
  */
 - (void)sd_setImageWithURL:(nullable NSURL *)url
-                  forState:(UIControlState)state
           placeholderImage:(nullable UIImage *)placeholder
                    options:(SDWebImageOptions)options
                  completed:(nullable SDExternalCompletionBlock)completedBlock;
 
-#pragma mark - Background Image
-
-/**
- * Get the current background image URL.
- */
-- (nullable NSURL *)sd_currentBackgroundImageURL;
-
-/**
- * Get the background image URL for a control state.
- * 
- * @param state Which state you want to know the URL for. The values are described in UIControlState.
- */
-- (nullable NSURL *)sd_backgroundImageURLForState:(UIControlState)state;
-
-/**
- * Set the backgroundImageView `image` with an `url`.
- *
- * The download is asynchronous and cached.
- *
- * @param url   The url for the image.
- * @param state The state that uses the specified title. The values are described in UIControlState.
- */
-- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url
-                            forState:(UIControlState)state NS_REFINED_FOR_SWIFT;
-
-/**
- * Set the backgroundImageView `image` with an `url` and a placeholder.
- *
- * The download is asynchronous and cached.
- *
- * @param url         The url for the image.
- * @param state       The state that uses the specified title. The values are described in UIControlState.
- * @param placeholder The image to be set initially, until the image request finishes.
- * @see sd_setImageWithURL:placeholderImage:options:
- */
-- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url
-                            forState:(UIControlState)state
-                    placeholderImage:(nullable UIImage *)placeholder NS_REFINED_FOR_SWIFT;
-
-/**
- * Set the backgroundImageView `image` with an `url`, placeholder and custom options.
- *
- * The download is asynchronous and cached.
- *
- * @param url         The url for the image.
- * @param state       The state that uses the specified title. The values are described in UIControlState.
- * @param placeholder The image to be set initially, until the image request finishes.
- * @param options     The options to use when downloading the image. @see SDWebImageOptions for the possible values.
- */
-- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url
-                            forState:(UIControlState)state
-                    placeholderImage:(nullable UIImage *)placeholder
-                             options:(SDWebImageOptions)options NS_REFINED_FOR_SWIFT;
-
-/**
- * Set the backgroundImageView `image` with an `url`.
- *
- * The download is asynchronous and cached.
- *
- * @param url            The url for the image.
- * @param state          The state that uses the specified title. The values are described in UIControlState.
- * @param completedBlock A block called when operation has been completed. This block has no return value
- *                       and takes the requested UIImage as first parameter. In case of error the image parameter
- *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
- *                       indicating if the image was retrieved from the local cache or from the network.
- *                       The fourth parameter is the original image url.
- */
-- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url
-                            forState:(UIControlState)state
-                           completed:(nullable SDExternalCompletionBlock)completedBlock;
-
 /**
- * Set the backgroundImageView `image` with an `url`, placeholder.
+ * Set the imageView `image` with an `url`, placeholder and custom options.
  *
  * The download is asynchronous and cached.
  *
  * @param url            The url for the image.
- * @param state          The state that uses the specified title. The values are described in UIControlState.
  * @param placeholder    The image to be set initially, until the image request finishes.
+ * @param options        The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param progressBlock  A block called while image is downloading
+ *                       @note the progress block is executed on a background queue
  * @param completedBlock A block called when operation has been completed. This block has no return value
  *                       and takes the requested UIImage as first parameter. In case of error the image parameter
  *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
  *                       indicating if the image was retrieved from the local cache or from the network.
  *                       The fourth parameter is the original image url.
  */
-- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url
-                            forState:(UIControlState)state
-                    placeholderImage:(nullable UIImage *)placeholder
-                           completed:(nullable SDExternalCompletionBlock)completedBlock NS_REFINED_FOR_SWIFT;
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+          placeholderImage:(nullable UIImage *)placeholder
+                   options:(SDWebImageOptions)options
+                  progress:(nullable SDImageLoaderProgressBlock)progressBlock
+                 completed:(nullable SDExternalCompletionBlock)completedBlock;
 
 /**
- * Set the backgroundImageView `image` with an `url`, placeholder and custom options.
+ * Set the imageView `image` with an `url`, placeholder, custom options and context.
  *
  * The download is asynchronous and cached.
  *
  * @param url            The url for the image.
  * @param placeholder    The image to be set initially, until the image request finishes.
  * @param options        The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param context        A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
+ * @param progressBlock  A block called while image is downloading
+ *                       @note the progress block is executed on a background queue
  * @param completedBlock A block called when operation has been completed. This block has no return value
  *                       and takes the requested UIImage as first parameter. In case of error the image parameter
  *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
  *                       indicating if the image was retrieved from the local cache or from the network.
  *                       The fourth parameter is the original image url.
  */
-- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url
-                            forState:(UIControlState)state
-                    placeholderImage:(nullable UIImage *)placeholder
-                             options:(SDWebImageOptions)options
-                           completed:(nullable SDExternalCompletionBlock)completedBlock;
-
-#pragma mark - Cancel
-
-/**
- * Cancel the current image download
- */
-- (void)sd_cancelImageLoadForState:(UIControlState)state;
-
-/**
- * Cancel the current backgroundImage download
- */
-- (void)sd_cancelBackgroundImageLoadForState:(UIControlState)state;
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+          placeholderImage:(nullable UIImage *)placeholder
+                   options:(SDWebImageOptions)options
+                   context:(nullable SDWebImageContext *)context
+                  progress:(nullable SDImageLoaderProgressBlock)progressBlock
+                 completed:(nullable SDExternalCompletionBlock)completedBlock;
 
 @end
 
diff --git a/SDWebImage/Core/SDAnimatedImageView+WebCache.m b/SDWebImage/Core/SDAnimatedImageView+WebCache.m
new file mode 100644
index 000000000..beb56b2c5
--- /dev/null
+++ b/SDWebImage/Core/SDAnimatedImageView+WebCache.m
@@ -0,0 +1,79 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDAnimatedImageView+WebCache.h"
+
+#if SD_UIKIT || SD_MAC
+
+#import "UIView+WebCache.h"
+#import "SDAnimatedImage.h"
+
+@implementation SDAnimatedImageView (WebCache)
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url {
+    [self sd_setImageWithURL:url placeholderImage:nil options:0 progress:nil completed:nil];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder {
+    [self sd_setImageWithURL:url placeholderImage:placeholder options:0 progress:nil completed:nil];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options {
+    [self sd_setImageWithURL:url placeholderImage:placeholder options:options progress:nil completed:nil];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options context:(nullable SDWebImageContext *)context {
+    [self sd_setImageWithURL:url placeholderImage:placeholder options:options context:context progress:nil completed:nil];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setImageWithURL:url placeholderImage:nil options:0 progress:nil completed:completedBlock];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setImageWithURL:url placeholderImage:placeholder options:0 progress:nil completed:completedBlock];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setImageWithURL:url placeholderImage:placeholder options:options progress:nil completed:completedBlock];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options progress:(nullable SDImageLoaderProgressBlock)progressBlock completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setImageWithURL:url placeholderImage:placeholder options:options context:nil progress:progressBlock completed:completedBlock];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+          placeholderImage:(nullable UIImage *)placeholder
+                   options:(SDWebImageOptions)options
+                   context:(nullable SDWebImageContext *)context
+                  progress:(nullable SDImageLoaderProgressBlock)progressBlock
+                 completed:(nullable SDExternalCompletionBlock)completedBlock {
+    Class animatedImageClass = [SDAnimatedImage class];
+    SDWebImageMutableContext *mutableContext;
+    if (context) {
+        mutableContext = [context mutableCopy];
+    } else {
+        mutableContext = [NSMutableDictionary dictionary];
+    }
+    mutableContext[SDWebImageContextAnimatedImageClass] = animatedImageClass;
+    [self sd_internalSetImageWithURL:url
+                    placeholderImage:placeholder
+                             options:options
+                             context:mutableContext
+                       setImageBlock:nil
+                            progress:progressBlock
+                           completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+                               if (completedBlock) {
+                                   completedBlock(image, error, cacheType, imageURL);
+                               }
+                           }];
+}
+
+@end
+
+#endif
diff --git a/SDWebImage/Core/SDAnimatedImageView.h b/SDWebImage/Core/SDAnimatedImageView.h
new file mode 100644
index 000000000..aa315066e
--- /dev/null
+++ b/SDWebImage/Core/SDAnimatedImageView.h
@@ -0,0 +1,125 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+
+#if SD_UIKIT || SD_MAC
+
+#import "SDAnimatedImage.h"
+#import "SDAnimatedImagePlayer.h"
+#import "SDImageTransformer.h"
+
+/**
+ A drop-in replacement for UIImageView/NSImageView, you can use this for animated image rendering.
+ Call `setImage:` with `UIImage(NSImage)` which conforms to `SDAnimatedImage` protocol will start animated image rendering. Call with normal UIImage(NSImage) will back to normal UIImageView(NSImageView) rendering
+ For UIKit: use `-startAnimating`, `-stopAnimating` to control animating. `isAnimating` to check animation state.
+ For AppKit: use `-setAnimates:` to control animating, `animates` to check animation state. This view is layer-backed.
+ */
+NS_SWIFT_UI_ACTOR
+@interface SDAnimatedImageView : UIImageView
+/**
+ The internal animation player.
+ This property is only used for advanced usage, like inspecting/debugging animation status, control progressive loading, complicated animation frame index control, etc.
+ @warning Pay attention if you directly update the player's property like `totalFrameCount`, `totalLoopCount`, the same property on `SDAnimatedImageView` may not get synced.
+ */
+@property (nonatomic, strong, readonly, nullable) SDAnimatedImagePlayer *player;
+
+/**
+ The transformer for each decoded animated image frame.
+ We supports post-transform on animated image frame from version 5.20.
+ When you configure the transformer on `SDAnimatedImageView` and animation is playing, the `transformedImageWithImage:forKey:` will be called just after the frame is decoded. (note: The `key` arg is always empty for backward-compatible and may be removed in the future)
+ 
+ Example to tint the alpha animated image frame with a black color:
+ * @code
+ imageView.animationTransformer = [SDImageTintTransformer transformerWithColor:UIColor.blackColor];
+ * @endcode
+ @note The `transformerKey` property is used to ensure the buffer cache available. So make sure it's correct value match the actual logic on transformer. Which means, for the `same frame index + same transformer key`, the transformed image should always be the same.
+ */
+@property (nonatomic, strong, nullable) id<SDImageTransformer> animationTransformer;
+
+/**
+ Current display frame image. This value is KVO Compliance.
+ */
+@property (nonatomic, strong, readonly, nullable) UIImage *currentFrame;
+/**
+ Current frame index, zero based. This value is KVO Compliance.
+ */
+@property (nonatomic, assign, readonly) NSUInteger currentFrameIndex;
+/**
+ Current loop count since its latest animating. This value is KVO Compliance.
+ */
+@property (nonatomic, assign, readonly) NSUInteger currentLoopCount;
+/**
+ YES to choose `animationRepeatCount` property for animation loop count. No to use animated image's `animatedImageLoopCount` instead.
+ Default is NO.
+ */
+@property (nonatomic, assign) BOOL shouldCustomLoopCount;
+/**
+ Total loop count for animated image rendering. Default is animated image's loop count.
+ If you need to set custom loop count, set `shouldCustomLoopCount` to YES and change this value.
+ This class override UIImageView's `animationRepeatCount` property on iOS, use this property as well.
+ */
+@property (nonatomic, assign) NSInteger animationRepeatCount;
+/**
+ The animation playback rate. Default is 1.0.
+ `1.0` means the normal speed.
+ `0.0` means stopping the animation.
+ `0.0-1.0` means the slow speed.
+ `> 1.0` means the fast speed.
+ `< 0.0` is not supported currently and stop animation. (may support reverse playback in the future)
+ */
+@property (nonatomic, assign) double playbackRate;
+
+/// Asynchronous setup animation playback mode. Default mode is SDAnimatedImagePlaybackModeNormal.
+@property (nonatomic, assign) SDAnimatedImagePlaybackMode playbackMode;
+
+/**
+ Provide a max buffer size by bytes. This is used to adjust frame buffer count and can be useful when the decoding cost is expensive (such as Animated WebP software decoding). Default is 0.
+ `0` means automatically adjust by calculating current memory usage.
+ `1` means without any buffer cache, each of frames will be decoded and then be freed after rendering. (Lowest Memory and Highest CPU)
+ `NSUIntegerMax` means cache all the buffer. (Lowest CPU and Highest Memory)
+ */
+@property (nonatomic, assign) NSUInteger maxBufferSize;
+/**
+ Whehter or not to enable incremental image load for animated image. This is for the animated image which `sd_isIncremental` is YES (See `UIImage+Metadata.h`). If enable, animated image rendering will stop at the last frame available currently, and continue when another `setImage:` trigger, where the new animated image's `animatedImageData` should be updated from the previous one. If the `sd_isIncremental` is NO. The incremental image load stop.
+ @note If you are confused about this description, open Chrome browser to view some large GIF images with low network speed to see the animation behavior.
+ @note The best practice to use incremental load is using `initWithAnimatedCoder:scale:` in `SDAnimatedImage` with animated coder which conform to `SDProgressiveImageCoder` as well. Then call incremental update and incremental decode method to produce the image.
+ Default is YES. Set to NO to only render the static poster for incremental animated image.
+ */
+@property (nonatomic, assign) BOOL shouldIncrementalLoad;
+
+/**
+ Whether or not to clear the frame buffer cache when animation stopped. See `maxBufferSize`
+ This is useful when you want to limit the memory usage during frequently visibility changes (such as image view inside a list view, then push and pop)
+ Default is NO.
+ */
+@property (nonatomic, assign) BOOL clearBufferWhenStopped;
+
+/**
+ Whether or not to reset the current frame index when animation stopped.
+ For some of use case, you may want to reset the frame index to 0 when stop, but some other want to keep the current frame index.
+ Default is NO.
+ */
+@property (nonatomic, assign) BOOL resetFrameIndexWhenStopped;
+
+/**
+ If the image which conforms to `SDAnimatedImage` protocol has more than one frame, set this value to `YES` will automatically
+ play/stop the animation when the view become visible/invisible.
+ Default is YES.
+ */
+@property (nonatomic, assign) BOOL autoPlayAnimatedImage;
+
+/**
+ You can specify a runloop mode to let it rendering.
+ Default is NSRunLoopCommonModes on multi-core device, NSDefaultRunLoopMode on single-core device
+ @note This is useful for some cases, for example, always specify NSDefaultRunLoopMode, if you want to pause the animation when user scroll (for Mac user, drag the mouse or touchpad)
+ */
+@property (nonatomic, copy, nonnull) NSRunLoopMode runLoopMode;
+@end
+
+#endif
diff --git a/SDWebImage/Core/SDAnimatedImageView.m b/SDWebImage/Core/SDAnimatedImageView.m
new file mode 100644
index 000000000..332c0aa2d
--- /dev/null
+++ b/SDWebImage/Core/SDAnimatedImageView.m
@@ -0,0 +1,629 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDAnimatedImageView.h"
+
+#if SD_UIKIT || SD_MAC
+
+#import "UIImage+Metadata.h"
+#import "NSImage+Compatibility.h"
+#import "SDInternalMacros.h"
+#import "objc/runtime.h"
+
+// A wrapper to implements the transformer on animated image, like tint color
+@interface SDAnimatedImageFrameProvider : NSObject <SDAnimatedImageProvider>
+@property (nonatomic, strong) id<SDAnimatedImageProvider> provider;
+@property (nonatomic, strong) id<SDImageTransformer> transformer;
+@end
+
+@implementation SDAnimatedImageFrameProvider
+
+- (instancetype)initWithProvider:(id<SDAnimatedImageProvider>)provider transformer:(id<SDImageTransformer>)transformer {
+    self = [super init];
+    if (self) {
+        _provider = provider;
+        _transformer = transformer;
+    }
+    return self;
+}
+
+- (NSUInteger)hash {
+    NSUInteger prime = 31;
+    NSUInteger result = 1;
+    NSUInteger providerHash = self.provider.hash;
+    NSUInteger transformerHash = self.transformer.transformerKey.hash;
+    result = prime * result + providerHash;
+    result = prime * result + transformerHash;
+    return result;
+}
+
+- (BOOL)isEqual:(id)object {
+    if (nil == object) {
+      return NO;
+    }
+    if (self == object) {
+      return YES;
+    }
+    if (![object isKindOfClass:[self class]]) {
+      return NO;
+    }
+    return self.provider == [object provider]
+    && [self.transformer.transformerKey isEqualToString:[object transformer].transformerKey];
+}
+
+- (NSData *)animatedImageData {
+    return self.provider.animatedImageData;
+}
+
+- (NSUInteger)animatedImageFrameCount {
+    return self.provider.animatedImageFrameCount;
+}
+
+- (NSUInteger)animatedImageLoopCount {
+    return self.provider.animatedImageLoopCount;
+}
+
+- (NSTimeInterval)animatedImageDurationAtIndex:(NSUInteger)index {
+    return [self.provider animatedImageDurationAtIndex:index];
+}
+
+- (UIImage *)animatedImageFrameAtIndex:(NSUInteger)index {
+    UIImage *frame = [self.provider animatedImageFrameAtIndex:index];
+    return [self.transformer transformedImageWithImage:frame forKey:@""];
+}
+
+@end
+
+@interface UIImageView () <CALayerDelegate>
+@end
+
+@interface SDAnimatedImageView () {
+    BOOL _initFinished; // Extra flag to mark the `commonInit` is called
+    NSRunLoopMode _runLoopMode;
+    NSUInteger _maxBufferSize;
+    double _playbackRate;
+    SDAnimatedImagePlaybackMode _playbackMode;
+}
+
+@property (nonatomic, strong, readwrite) SDAnimatedImagePlayer *player;
+@property (nonatomic, strong, readwrite) UIImage *currentFrame;
+@property (nonatomic, assign, readwrite) NSUInteger currentFrameIndex;
+@property (nonatomic, assign, readwrite) NSUInteger currentLoopCount;
+@property (nonatomic, assign) BOOL shouldAnimate;
+@property (nonatomic, assign) BOOL isProgressive;
+@property (nonatomic) CALayer *imageViewLayer; // The actual rendering layer.
+
+@end
+
+@implementation SDAnimatedImageView
+#if SD_UIKIT
+@dynamic animationRepeatCount; // we re-use this property from `UIImageView` super class on iOS.
+#endif
+
+#pragma mark - Initializers
+
+#if SD_MAC
++ (instancetype)imageViewWithImage:(NSImage *)image
+{
+    NSRect frame = NSMakeRect(0, 0, image.size.width, image.size.height);
+    SDAnimatedImageView *imageView = [[SDAnimatedImageView alloc] initWithFrame:frame];
+    [imageView setImage:image];
+    return imageView;
+}
+#else
+// -initWithImage: isn't documented as a designated initializer of UIImageView, but it actually seems to be.
+// Using -initWithImage: doesn't call any of the other designated initializers.
+- (instancetype)initWithImage:(UIImage *)image
+{
+    self = [super initWithImage:image];
+    if (self) {
+        [self commonInit];
+    }
+    return self;
+}
+
+// -initWithImage:highlightedImage: also isn't documented as a designated initializer of UIImageView, but it doesn't call any other designated initializers.
+- (instancetype)initWithImage:(UIImage *)image highlightedImage:(UIImage *)highlightedImage
+{
+    self = [super initWithImage:image highlightedImage:highlightedImage];
+    if (self) {
+        [self commonInit];
+    }
+    return self;
+}
+#endif
+
+- (instancetype)initWithFrame:(CGRect)frame
+{
+    self = [super initWithFrame:frame];
+    if (self) {
+        [self commonInit];
+    }
+    return self;
+}
+
+- (instancetype)initWithCoder:(NSCoder *)aDecoder
+{
+    self = [super initWithCoder:aDecoder];
+    if (self) {
+        [self commonInit];
+    }
+    return self;
+}
+
+- (void)commonInit
+{
+    // Pay attention that UIKit's `initWithImage:` will trigger a `setImage:` during initialization before this `commonInit`.
+    // So the properties which rely on this order, should using lazy-evaluation or do extra check in `setImage:`.
+    self.autoPlayAnimatedImage = YES;
+    self.shouldCustomLoopCount = NO;
+    self.shouldIncrementalLoad = YES;
+    self.playbackRate = 1.0;
+#if SD_MAC
+    self.wantsLayer = YES;
+#endif
+    // Mark commonInit finished
+    _initFinished = YES;
+}
+
+#pragma mark - Accessors
+#pragma mark Public
+
+- (void)setImage:(UIImage *)image
+{
+    if (self.image == image) {
+        super.image = image;
+        return;
+    }
+    
+    // Check Progressive rendering
+    [self updateIsProgressiveWithImage:image];
+    
+    if (!self.isProgressive) {
+        // Stop animating
+        self.player = nil;
+        self.currentFrame = nil;
+        self.currentFrameIndex = 0;
+        self.currentLoopCount = 0;
+    }
+    
+    // We need call super method to keep function. This will impliedly call `setNeedsDisplay`. But we have no way to avoid this when using animated image. So we call `setNeedsDisplay` again at the end.
+    super.image = image;
+    if ([image.class conformsToProtocol:@protocol(SDAnimatedImage)] && [(id<SDAnimatedImage>)image animatedImageFrameCount] > 1) {
+        if (!self.player) {
+            id<SDAnimatedImageProvider> provider;
+            // Check progressive loading
+            if (self.isProgressive) {
+                provider = [(id<SDAnimatedImage>)image animatedCoder];
+            } else {
+                provider = (id<SDAnimatedImage>)image;
+            }
+            // Create animated player
+            if (self.animationTransformer) {
+                // Check if post-transform animation available
+                provider = [[SDAnimatedImageFrameProvider alloc] initWithProvider:provider transformer:self.animationTransformer];
+                self.player = [SDAnimatedImagePlayer playerWithProvider:provider];
+            } else {
+                // Normal animation without post-transform
+                self.player = [SDAnimatedImagePlayer playerWithProvider:provider];
+            }
+        } else {
+            // Update Frame Count
+            self.player.totalFrameCount = [(id<SDAnimatedImage>)image animatedImageFrameCount];
+        }
+        
+        if (!self.player) {
+            // animated player nil means the image format is not supported, or frame count <= 1
+            return;
+        }
+        
+        // Custom Loop Count
+        if (self.shouldCustomLoopCount) {
+            self.player.totalLoopCount = self.animationRepeatCount;
+        }
+        
+        // RunLoop Mode
+        self.player.runLoopMode = self.runLoopMode;
+        
+        // Max Buffer Size
+        self.player.maxBufferSize = self.maxBufferSize;
+        
+        // Play Rate
+        self.player.playbackRate = self.playbackRate;
+        
+        // Play Mode
+        self.player.playbackMode = self.playbackMode;
+
+        // Setup handler
+        @weakify(self);
+        self.player.animationFrameHandler = ^(NSUInteger index, UIImage * frame) {
+            @strongify(self);
+            if (!self) {
+                return;
+            }
+            self.currentFrameIndex = index;
+            self.currentFrame = frame;
+            [self.imageViewLayer setNeedsDisplay];
+        };
+        self.player.animationLoopHandler = ^(NSUInteger loopCount) {
+            @strongify(self);
+            if (!self) {
+                return;
+            }
+            // Progressive image reach the current last frame index. Keep the state and pause animating. Wait for later restart
+            if (self.isProgressive) {
+                NSUInteger lastFrameIndex = self.player.totalFrameCount - 1;
+                [self.player seekToFrameAtIndex:lastFrameIndex loopCount:0];
+                [self.player pausePlaying];
+            } else {
+                self.currentLoopCount = loopCount;
+            }
+        };
+        
+        // Ensure disabled highlighting; it's not supported (see `-setHighlighted:`).
+        super.highlighted = NO;
+        
+        [self stopAnimating];
+        [self checkPlay];
+    }
+    [self.imageViewLayer setNeedsDisplay];
+}
+
+#pragma mark - Configuration
+
+- (void)setRunLoopMode:(NSRunLoopMode)runLoopMode
+{
+    _runLoopMode = [runLoopMode copy];
+    self.player.runLoopMode = runLoopMode;
+}
+
+- (NSRunLoopMode)runLoopMode
+{
+    if (!_runLoopMode) {
+        _runLoopMode = [[self class] defaultRunLoopMode];
+    }
+    return _runLoopMode;
+}
+
++ (NSString *)defaultRunLoopMode {
+    // Key off `activeProcessorCount` (as opposed to `processorCount`) since the system could shut down cores in certain situations.
+    return [NSProcessInfo processInfo].activeProcessorCount > 1 ? NSRunLoopCommonModes : NSDefaultRunLoopMode;
+}
+
+- (void)setMaxBufferSize:(NSUInteger)maxBufferSize
+{
+    _maxBufferSize = maxBufferSize;
+    self.player.maxBufferSize = maxBufferSize;
+}
+
+- (NSUInteger)maxBufferSize {
+    return _maxBufferSize; // Defaults to 0
+}
+
+- (void)setPlaybackRate:(double)playbackRate
+{
+    _playbackRate = playbackRate;
+    self.player.playbackRate = playbackRate;
+}
+
+- (double)playbackRate
+{
+    if (!_initFinished) {
+        return 1.0; // Defaults to 1.0
+    }
+    return _playbackRate;
+}
+
+- (void)setPlaybackMode:(SDAnimatedImagePlaybackMode)playbackMode {
+    _playbackMode = playbackMode;
+    self.player.playbackMode = playbackMode;
+}
+
+- (SDAnimatedImagePlaybackMode)playbackMode {
+    if (!_initFinished) {
+        return SDAnimatedImagePlaybackModeNormal; // Default mode is normal
+    }
+    return _playbackMode;
+}
+
+
+- (BOOL)shouldIncrementalLoad
+{
+    if (!_initFinished) {
+        return YES; // Defaults to YES
+    }
+    return _initFinished;
+}
+
+#pragma mark - UIView Method Overrides
+#pragma mark Observing View-Related Changes
+
+#if SD_MAC
+- (void)viewDidMoveToSuperview
+#else
+- (void)didMoveToSuperview
+#endif
+{
+#if SD_MAC
+    [super viewDidMoveToSuperview];
+#else
+    [super didMoveToSuperview];
+#endif
+    
+    [self checkPlay];
+}
+
+#if SD_MAC
+- (void)viewDidMoveToWindow
+#else
+- (void)didMoveToWindow
+#endif
+{
+#if SD_MAC
+    [super viewDidMoveToWindow];
+#else
+    [super didMoveToWindow];
+#endif
+    
+    [self checkPlay];
+}
+
+#if SD_MAC
+- (void)setAlphaValue:(CGFloat)alphaValue
+#else
+- (void)setAlpha:(CGFloat)alpha
+#endif
+{
+#if SD_MAC
+    [super setAlphaValue:alphaValue];
+#else
+    [super setAlpha:alpha];
+#endif
+    
+    [self checkPlay];
+}
+
+- (void)setHidden:(BOOL)hidden
+{
+    [super setHidden:hidden];
+    
+    [self checkPlay];
+}
+
+#pragma mark - UIImageView Method Overrides
+#pragma mark Image Data
+
+- (void)setAnimationRepeatCount:(NSInteger)animationRepeatCount
+{
+#if SD_UIKIT
+    [super setAnimationRepeatCount:animationRepeatCount];
+#else
+    _animationRepeatCount = animationRepeatCount;
+#endif
+    
+    if (self.shouldCustomLoopCount) {
+        self.player.totalLoopCount = animationRepeatCount;
+    }
+}
+
+- (void)startAnimating
+{
+    if (self.player) {
+        [self updateShouldAnimate];
+        if (self.shouldAnimate) {
+            [self.player startPlaying];
+        }
+    } else {
+#if SD_UIKIT
+        [super startAnimating];
+#else
+        [super setAnimates:YES];
+#endif
+    }
+}
+
+- (void)stopAnimating
+{
+    if (self.player) {
+        if (self.resetFrameIndexWhenStopped) {
+            [self.player stopPlaying];
+        } else {
+            [self.player pausePlaying];
+        }
+        if (self.clearBufferWhenStopped) {
+            [self.player clearFrameBuffer];
+        }
+    } else {
+#if SD_UIKIT
+        [super stopAnimating];
+#else
+        [super setAnimates:NO];
+#endif
+    }
+}
+
+#if SD_UIKIT
+- (BOOL)isAnimating
+{
+    if (self.player) {
+        return self.player.isPlaying;
+    } else {
+        return [super isAnimating];
+    }
+}
+#endif
+
+#if SD_MAC
+- (BOOL)animates
+{
+    if (self.player) {
+        return self.player.isPlaying;
+    } else {
+        return [super animates];
+    }
+}
+
+- (void)setAnimates:(BOOL)animates
+{
+    if (animates) {
+        [self startAnimating];
+    } else {
+        [self stopAnimating];
+    }
+}
+#endif
+
+#pragma mark Highlighted Image Unsupport
+
+- (void)setHighlighted:(BOOL)highlighted
+{
+    // Highlighted image is unsupported for animated images, but implementing it breaks the image view when embedded in a UICollectionViewCell.
+    if (!self.player) {
+        [super setHighlighted:highlighted];
+    }
+}
+
+
+#pragma mark - Private Methods
+#pragma mark Animation
+
+/// Check if it should be played
+- (void)checkPlay
+{
+    // Only handle for SDAnimatedImage, leave UIAnimatedImage or animationImages for super implementation control
+    if (self.player && self.autoPlayAnimatedImage) {
+        [self updateShouldAnimate];
+        if (self.shouldAnimate) {
+            [self startAnimating];
+        } else {
+            [self stopAnimating];
+        }
+    }
+}
+
+// Don't repeatedly check our window & superview in `-displayDidRefresh:` for performance reasons.
+// Just update our cached value whenever the animated image or visibility (window, superview, hidden, alpha) is changed.
+- (void)updateShouldAnimate
+{
+#if SD_MAC
+    BOOL isVisible = self.window && self.superview && ![self isHidden] && self.alphaValue > 0.0;
+#else
+    BOOL isVisible = self.window && self.superview && ![self isHidden] && self.alpha > 0.0;
+#endif
+    self.shouldAnimate = self.player && isVisible;
+}
+
+// Update progressive status only after `setImage:` call.
+- (void)updateIsProgressiveWithImage:(UIImage *)image
+{
+    self.isProgressive = NO;
+    if (!self.shouldIncrementalLoad) {
+        // Early return
+        return;
+    }
+    // We must use `image.class conformsToProtocol:` instead of `image conformsToProtocol:` here
+    // Because UIKit on macOS, using internal hard-coded override method, which returns NO
+    id<SDAnimatedImageCoder> currentAnimatedCoder = [self progressiveAnimatedCoderForImage:image];
+    if (currentAnimatedCoder) {
+        UIImage *previousImage = self.image;
+        if (!previousImage) {
+            // If current animated coder supports progressive, and no previous image to check, start progressive loading
+            self.isProgressive = YES;
+        } else {
+            id<SDAnimatedImageCoder> previousAnimatedCoder = [self progressiveAnimatedCoderForImage:previousImage];
+            if (previousAnimatedCoder == currentAnimatedCoder) {
+                // If current animated coder is the same as previous, start progressive loading
+                self.isProgressive = YES;
+            }
+        }
+    }
+}
+
+// Check if image can represent a `Progressive Animated Image` during loading
+- (id<SDAnimatedImageCoder, SDProgressiveImageCoder>)progressiveAnimatedCoderForImage:(UIImage *)image
+{
+    if ([image.class conformsToProtocol:@protocol(SDAnimatedImage)] && image.sd_isIncremental && [image respondsToSelector:@selector(animatedCoder)]) {
+        id<SDAnimatedImageCoder> animatedCoder = [(id<SDAnimatedImage>)image animatedCoder];
+        if ([animatedCoder respondsToSelector:@selector(initIncrementalWithOptions:)]) {
+            return (id<SDAnimatedImageCoder, SDProgressiveImageCoder>)animatedCoder;
+        }
+    }
+    return nil;
+}
+
+
+#pragma mark Providing the Layer's Content
+#pragma mark - CALayerDelegate
+
+- (void)displayLayer:(CALayer *)layer
+{
+    UIImage *currentFrame = self.currentFrame;
+    if (currentFrame) {
+        layer.contentsScale = currentFrame.scale;
+        layer.contents = (__bridge id)currentFrame.CGImage;
+    } else {
+        // If we have no animation frames, call super implementation. iOS 14+ UIImageView use this delegate method for rendering.
+        if ([UIImageView instancesRespondToSelector:@selector(displayLayer:)]) {
+            [super displayLayer:layer];
+        } else {
+            // Fallback to implements the static image rendering by ourselves (like macOS or before iOS 14)
+            currentFrame = super.image;
+            layer.contentsScale = currentFrame.scale;
+            layer.contents = (__bridge id)currentFrame.CGImage;
+        }
+    }
+}
+
+#if SD_UIKIT
+- (void)traitCollectionDidChange:(UITraitCollection *)previousTraitCollection {
+    // See: #3635
+    // From iOS 17, when UIImageView entering the background, it will receive the trait collection changes, and modify the CALayer.contents by `self.image.CGImage`
+    // However, For animated image, `self.image.CGImge != self.currentFrame.CGImage`, right ?
+    // So this cause the render issue, we need to reset the CALayer.contents again
+    [super traitCollectionDidChange:previousTraitCollection];
+    [self.imageViewLayer setNeedsDisplay];
+}
+#endif
+
+#if SD_MAC
+// NSImageView use a subview. We need this subview's layer for actual rendering.
+// Why using this design may because of properties like `imageAlignment` and `imageScaling`, which it's not available for UIImageView.contentMode (it's impossible to align left and keep aspect ratio at the same time)
+- (NSView *)imageView {
+    NSImageView *imageView = objc_getAssociatedObject(self, SD_SEL_SPI(imageView));
+    if (!imageView) {
+        // macOS 10.14
+        imageView = objc_getAssociatedObject(self, SD_SEL_SPI(imageSubview));
+    }
+    return imageView;
+}
+
+// on macOS, it's the imageView subview's layer (we use layer-hosting view to let CALayerDelegate works)
+- (CALayer *)imageViewLayer {
+    NSView *imageView = self.imageView;
+    if (!imageView) {
+        return nil;
+    }
+    if (!_imageViewLayer) {
+        _imageViewLayer = [CALayer new];
+        _imageViewLayer.delegate = self;
+        imageView.layer = _imageViewLayer;
+        imageView.wantsLayer = YES;
+    }
+    return _imageViewLayer;
+}
+#else
+// on iOS, it's the imageView itself's layer
+- (CALayer *)imageViewLayer {
+    return self.layer;
+}
+
+#endif
+
+@end
+
+#endif
diff --git a/SDWebImage/Core/SDCallbackQueue.h b/SDWebImage/Core/SDCallbackQueue.h
new file mode 100644
index 000000000..93c44f111
--- /dev/null
+++ b/SDWebImage/Core/SDCallbackQueue.h
@@ -0,0 +1,59 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+
+#import "SDWebImageCompat.h"
+
+/// SDCallbackPolicy controls how we execute the block on the queue, like whether to use `dispatch_async/dispatch_sync`, check if current queue match target queue, or just invoke without any context.
+typedef NS_ENUM(NSUInteger, SDCallbackPolicy) {
+    /// When the current queue is equal to callback queue, sync/async will just invoke `block` directly without dispatch. Else it use `dispatch_async`/`dispatch_sync` to dispatch block on queue. This is useful for UIKit rendering to ensure all blocks executed in the same runloop
+    SDCallbackPolicySafeExecute = 0,
+    /// Follow async/sync using the correspond `dispatch_async`/`dispatch_sync` to dispatch block on queue
+    SDCallbackPolicyDispatch = 1,
+    /// Ignore any async/sync and just directly invoke `block` in current queue (without `dispatch_async`/`dispatch_sync`)
+    SDCallbackPolicyInvoke = 2,
+    /// Ensure callback in main thread. Do `dispatch_async` if the `NSThread.isMainTrhead == true` ; else do invoke `block`. Never use `dispatch_sync`, suitable for special UI-related code
+    SDCallbackPolicySafeAsyncMainThread = 3,
+};
+
+/// SDCallbackQueue is a wrapper used to control how the completionBlock should perform on queues, used by our `Cache`/`Manager`/`Loader`.
+/// Useful when you call SDWebImage in non-main queue and want to avoid it callback into main queue, which may cause issue.
+@interface SDCallbackQueue : NSObject
+
+/// The main queue. This is the default value, has the same effect when passing `nil` to `SDWebImageContextCallbackQueue`
+/// The policy defaults to `SDCallbackPolicySafeAsyncMainThread`
+@property (nonnull, class, readonly) SDCallbackQueue *mainQueue;
+
+/// The caller current queue. Using `dispatch_get_current_queue`. This is not a dynamic value and only keep the first call time queue.
+/// The policy defaults to `SDCallbackPolicySafeExecute`
+@property (nonnull, class, readonly) SDCallbackQueue *currentQueue;
+
+/// The global concurrent queue (user-initiated QoS). Using `dispatch_get_global_queue`.
+/// The policy defaults to `SDCallbackPolicySafeExecute`
+@property (nonnull, class, readonly) SDCallbackQueue *globalQueue;
+
+/// The current queue's callback policy.
+@property (nonatomic, assign, readwrite) SDCallbackPolicy policy;
+
+- (nonnull instancetype)init NS_UNAVAILABLE;
++ (nonnull instancetype)new  NS_UNAVAILABLE;
+/// Create the callback queue with a GCD queue. The policy defaults to `SDCallbackPolicySafeExecute`
+/// - Parameter queue: The GCD queue, should not be NULL
+- (nonnull instancetype)initWithDispatchQueue:(nonnull dispatch_queue_t)queue NS_DESIGNATED_INITIALIZER;
+
+#pragma mark - Execution Entry
+
+/// Submits a block for execution and returns after that block finishes executing.
+/// - Parameter block: The block that contains the work to perform.
+- (void)sync:(nonnull dispatch_block_t)block API_DEPRECATED("No longer use, may cause deadlock when misused", macos(10.10, 10.10), ios(8.0, 8.0), tvos(9.0, 9.0), watchos(2.0, 2.0));;
+
+/// Schedules a block asynchronously for execution.
+/// - Parameter block: The block that contains the work to perform.
+- (void)async:(nonnull dispatch_block_t)block;
+
+@end
diff --git a/SDWebImage/Core/SDCallbackQueue.m b/SDWebImage/Core/SDCallbackQueue.m
new file mode 100644
index 000000000..b4d052155
--- /dev/null
+++ b/SDWebImage/Core/SDCallbackQueue.m
@@ -0,0 +1,118 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+
+#import "SDCallbackQueue.h"
+
+@interface SDCallbackQueue ()
+
+@property (nonatomic, strong, nonnull) dispatch_queue_t queue;
+
+@end
+
+static inline void SDSafeAsyncMainThread(dispatch_block_t _Nonnull block) {
+    if (NSThread.isMainThread) {
+        block();
+    } else {
+        dispatch_async(dispatch_get_main_queue(), block);
+    }
+}
+
+static void SDSafeExecute(dispatch_queue_t queue, dispatch_block_t _Nonnull block, BOOL async) {
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+    dispatch_queue_t currentQueue = dispatch_get_current_queue();
+#pragma clang diagnostic pop
+    if (queue == currentQueue) {
+        block();
+        return;
+    }
+    // Special handle for main queue only
+    if (NSThread.isMainThread && queue == dispatch_get_main_queue()) {
+        block();
+        return;
+    }
+    if (async) {
+        dispatch_async(queue, block);
+    } else {
+        dispatch_sync(queue, block);
+    }
+}
+
+@implementation SDCallbackQueue
+
+- (instancetype)initWithDispatchQueue:(dispatch_queue_t)queue {
+    self = [super init];
+    if (self) {
+        NSCParameterAssert(queue);
+        _queue = queue;
+        _policy = SDCallbackPolicySafeExecute;
+    }
+    return self;
+}
+
++ (SDCallbackQueue *)mainQueue {
+    SDCallbackQueue *queue = [[SDCallbackQueue alloc] initWithDispatchQueue:dispatch_get_main_queue()];
+    queue->_policy = SDCallbackPolicySafeAsyncMainThread;
+    return queue;
+}
+
++ (SDCallbackQueue *)currentQueue {
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+    SDCallbackQueue *queue = [[SDCallbackQueue alloc] initWithDispatchQueue:dispatch_get_current_queue()];
+#pragma clang diagnostic pop
+    return queue;
+}
+
++ (SDCallbackQueue *)globalQueue {
+    SDCallbackQueue *queue = [[SDCallbackQueue alloc] initWithDispatchQueue:dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0)];
+    return queue;
+}
+
+- (void)sync:(nonnull dispatch_block_t)block {
+    switch (self.policy) {
+        case SDCallbackPolicySafeExecute:
+            SDSafeExecute(self.queue, block, NO);
+            break;
+        case SDCallbackPolicyDispatch:
+            dispatch_sync(self.queue, block);
+            break;
+        case SDCallbackPolicyInvoke:
+            block();
+            break;
+        case SDCallbackPolicySafeAsyncMainThread:
+            SDSafeAsyncMainThread(block);
+            break;
+        default:
+            NSCAssert(NO, @"unexpected policy %tu", self.policy);
+            break;
+    }
+}
+
+- (void)async:(nonnull dispatch_block_t)block {
+    switch (self.policy) {
+        case SDCallbackPolicySafeExecute:
+            SDSafeExecute(self.queue, block, YES);
+            break;
+        case SDCallbackPolicyDispatch:
+            dispatch_async(self.queue, block);
+            break;
+        case SDCallbackPolicyInvoke:
+            block();
+            break;
+        case SDCallbackPolicySafeAsyncMainThread:
+            SDSafeAsyncMainThread(block);
+            break;
+        default:
+            NSCAssert(NO, @"unexpected policy %tu", self.policy);
+            break;
+    }
+}
+
+@end
diff --git a/SDWebImage/Core/SDDiskCache.h b/SDWebImage/Core/SDDiskCache.h
new file mode 100644
index 000000000..fbfd4a93a
--- /dev/null
+++ b/SDWebImage/Core/SDDiskCache.h
@@ -0,0 +1,146 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+
+@class SDImageCacheConfig;
+/**
+ A protocol to allow custom disk cache used in SDImageCache.
+ */
+@protocol SDDiskCache <NSObject>
+
+// All of these method are called from the same global queue to avoid blocking on main queue and thread-safe problem. But it's also recommend to ensure thread-safe yourself using lock or other ways.
+@required
+/**
+ Create a new disk cache based on the specified path. You can check `maxDiskSize` and `maxDiskAge` used for disk cache.
+ 
+ @param cachePath Full path of a directory in which the cache will write data.
+ Once initialized you should not read and write to this directory.
+ @param config The cache config to be used to create the cache.
+ 
+ @return A new cache object, or nil if an error occurs.
+ */
+- (nullable instancetype)initWithCachePath:(nonnull NSString *)cachePath config:(nonnull SDImageCacheConfig *)config;
+
+/**
+ Returns a boolean value that indicates whether a given key is in cache.
+ This method may blocks the calling thread until file read finished.
+ 
+ @param key A string identifying the data. If nil, just return NO.
+ @return Whether the key is in cache.
+ */
+- (BOOL)containsDataForKey:(nonnull NSString *)key;
+
+/**
+ Returns the data associated with a given key.
+ This method may blocks the calling thread until file read finished.
+ 
+ @param key A string identifying the data. If nil, just return nil.
+ @return The value associated with key, or nil if no value is associated with key.
+ */
+- (nullable NSData *)dataForKey:(nonnull NSString *)key;
+
+/**
+ Sets the value of the specified key in the cache.
+ This method may blocks the calling thread until file write finished.
+ 
+ @param data The data to be stored in the cache.
+ @param key    The key with which to associate the value. If nil, this method has no effect.
+ */
+- (void)setData:(nullable NSData *)data forKey:(nonnull NSString *)key;
+
+/**
+ Returns the extended data associated with a given key.
+ This method may blocks the calling thread until file read finished.
+ 
+ @param key A string identifying the data. If nil, just return nil.
+ @return The value associated with key, or nil if no value is associated with key.
+ */
+- (nullable NSData *)extendedDataForKey:(nonnull NSString *)key;
+
+/**
+ Set extended data with a given key.
+ 
+ @discussion You can set any extended data to exist cache key. Without override the exist disk file data.
+ on UNIX, the common way for this is to use the Extended file attributes (xattr)
+ 
+ @param extendedData The extended data (pass nil to remove).
+ @param key The key with which to associate the value. If nil, this method has no effect.
+*/
+- (void)setExtendedData:(nullable NSData *)extendedData forKey:(nonnull NSString *)key;
+
+/**
+ Removes the value of the specified key in the cache.
+ This method may blocks the calling thread until file delete finished.
+ 
+ @param key The key identifying the value to be removed. If nil, this method has no effect.
+ */
+- (void)removeDataForKey:(nonnull NSString *)key;
+
+/**
+ Empties the cache.
+ This method may blocks the calling thread until file delete finished.
+ */
+- (void)removeAllData;
+
+/**
+ Removes the expired data from the cache. You can choose the data to remove base on `ageLimit`, `countLimit` and `sizeLimit` options.
+ */
+- (void)removeExpiredData;
+
+/**
+ The cache path for key
+
+ @param key A string identifying the value
+ @return The cache path for key. Or nil if the key can not associate to a path
+ */
+- (nullable NSString *)cachePathForKey:(nonnull NSString *)key;
+
+/**
+ Returns the number of data in this cache.
+ This method may blocks the calling thread until file read finished.
+ 
+ @return The total data count.
+ */
+- (NSUInteger)totalCount;
+
+/**
+ Returns the total size (in bytes) of data in this cache.
+ This method may blocks the calling thread until file read finished.
+ 
+ @return The total data size in bytes.
+ */
+- (NSUInteger)totalSize;
+
+@end
+
+/**
+ The built-in disk cache.
+ */
+@interface SDDiskCache : NSObject <SDDiskCache>
+/**
+ Cache Config object - storing all kind of settings.
+ */
+@property (nonatomic, strong, readonly, nonnull) SDImageCacheConfig *config;
+
+- (nonnull instancetype)init NS_UNAVAILABLE;
++ (nonnull instancetype)new  NS_UNAVAILABLE;
+
+/**
+ Move the cache directory from old location to new location, the old location will be removed after finish.
+ If the old location does not exist, does nothing.
+ If the new location does not exist, only do a movement of directory.
+ If the new location does exist, will move and merge the files from old location.
+ If the new location does exist, but is not a directory, will remove it and do a movement of directory.
+
+ @param srcPath old location of cache directory
+ @param dstPath new location of cache directory
+ */
+- (void)moveCacheDirectoryFromPath:(nonnull NSString *)srcPath toPath:(nonnull NSString *)dstPath;
+
+@end
diff --git a/SDWebImage/Core/SDDiskCache.m b/SDWebImage/Core/SDDiskCache.m
new file mode 100644
index 000000000..938b844af
--- /dev/null
+++ b/SDWebImage/Core/SDDiskCache.m
@@ -0,0 +1,390 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDDiskCache.h"
+#import "SDImageCacheConfig.h"
+#import "SDFileAttributeHelper.h"
+#import <CommonCrypto/CommonDigest.h>
+
+static NSString * const SDDiskCacheExtendedAttributeName = @"com.hackemist.SDDiskCache";
+
+@interface SDDiskCache ()
+
+@property (nonatomic, copy) NSString *diskCachePath;
+@property (nonatomic, strong, nonnull) NSFileManager *fileManager;
+
+@end
+
+@implementation SDDiskCache
+
+- (instancetype)init {
+    NSAssert(NO, @"Use `initWithCachePath:` with the disk cache path");
+    return nil;
+}
+
+#pragma mark - SDcachePathForKeyDiskCache Protocol
+- (instancetype)initWithCachePath:(NSString *)cachePath config:(nonnull SDImageCacheConfig *)config {
+    if (self = [super init]) {
+        _diskCachePath = cachePath;
+        _config = config;
+        [self commonInit];
+    }
+    return self;
+}
+
+- (void)commonInit {
+    if (self.config.fileManager) {
+        self.fileManager = self.config.fileManager;
+    } else {
+        self.fileManager = [NSFileManager new];
+    }
+  
+    [self createDirectory];
+}
+
+- (BOOL)containsDataForKey:(NSString *)key {
+    NSParameterAssert(key);
+    NSString *filePath = [self cachePathForKey:key];
+    BOOL exists = [self.fileManager fileExistsAtPath:filePath];
+    
+    // fallback because of https://github.com/rs/SDWebImage/pull/976 that added the extension to the disk file name
+    // checking the key with and without the extension
+    if (!exists) {
+        exists = [self.fileManager fileExistsAtPath:filePath.stringByDeletingPathExtension];
+    }
+    
+    return exists;
+}
+
+- (NSData *)dataForKey:(NSString *)key {
+    NSParameterAssert(key);
+    NSString *filePath = [self cachePathForKey:key];
+    // if filePath is nil or (null)，framework will crash with this：
+    // Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[_NSPlaceholderData initWithContentsOfFile:options:maxLength:error:]: nil file argument'
+    if (filePath == nil || [@"(null)" isEqualToString: filePath]) {
+        return nil;
+    }
+    NSData *data = [NSData dataWithContentsOfFile:filePath options:self.config.diskCacheReadingOptions error:nil];
+    if (data) {
+        [[NSURL fileURLWithPath:filePath] setResourceValue:[NSDate date] forKey:NSURLContentAccessDateKey error:nil];
+        return data;
+    }
+    
+    // fallback because of https://github.com/rs/SDWebImage/pull/976 that added the extension to the disk file name
+    // checking the key with and without the extension
+    filePath = filePath.stringByDeletingPathExtension;
+    data = [NSData dataWithContentsOfFile:filePath options:self.config.diskCacheReadingOptions error:nil];
+    if (data) {
+        [[NSURL fileURLWithPath:filePath] setResourceValue:[NSDate date] forKey:NSURLContentAccessDateKey error:nil];
+        return data;
+    }
+    
+    return nil;
+}
+
+- (void)setData:(NSData *)data forKey:(NSString *)key {
+    NSParameterAssert(data);
+    NSParameterAssert(key);
+    
+    // get cache Path for image key
+    NSString *cachePathForKey = [self cachePathForKey:key];
+    // transform to NSURL
+    NSURL *fileURL = [NSURL fileURLWithPath:cachePathForKey isDirectory:NO];
+    
+    [data writeToURL:fileURL options:self.config.diskCacheWritingOptions error:nil];
+}
+
+- (NSData *)extendedDataForKey:(NSString *)key {
+    NSParameterAssert(key);
+    
+    // get cache Path for image key
+    NSString *cachePathForKey = [self cachePathForKey:key];
+    
+    NSData *extendedData = [SDFileAttributeHelper extendedAttribute:SDDiskCacheExtendedAttributeName atPath:cachePathForKey traverseLink:NO error:nil];
+    
+    return extendedData;
+}
+
+- (void)setExtendedData:(NSData *)extendedData forKey:(NSString *)key {
+    NSParameterAssert(key);
+    // get cache Path for image key
+    NSString *cachePathForKey = [self cachePathForKey:key];
+    
+    if (!extendedData) {
+        // Remove
+        [SDFileAttributeHelper removeExtendedAttribute:SDDiskCacheExtendedAttributeName atPath:cachePathForKey traverseLink:NO error:nil];
+    } else {
+        // Override
+        [SDFileAttributeHelper setExtendedAttribute:SDDiskCacheExtendedAttributeName value:extendedData atPath:cachePathForKey traverseLink:NO overwrite:YES error:nil];
+    }
+}
+
+- (void)removeDataForKey:(NSString *)key {
+    NSParameterAssert(key);
+    NSString *filePath = [self cachePathForKey:key];
+    [self.fileManager removeItemAtPath:filePath error:nil];
+}
+
+- (void)removeAllData {
+    [self.fileManager removeItemAtPath:self.diskCachePath error:nil];
+    [self createDirectory];
+}
+
+- (void)createDirectory {
+  [self.fileManager createDirectoryAtPath:self.diskCachePath
+          withIntermediateDirectories:YES
+                           attributes:nil
+                                error:NULL];
+  
+  // disable iCloud backup
+  if (self.config.shouldDisableiCloud) {
+      // ignore iCloud backup resource value error
+      [[NSURL fileURLWithPath:self.diskCachePath isDirectory:YES] setResourceValue:@YES forKey:NSURLIsExcludedFromBackupKey error:nil];
+  }
+}
+
+- (void)removeExpiredData {
+    NSURL *diskCacheURL = [NSURL fileURLWithPath:self.diskCachePath isDirectory:YES];
+    
+    // Compute content date key to be used for tests
+    NSURLResourceKey cacheContentDateKey;
+    switch (self.config.diskCacheExpireType) {
+        case SDImageCacheConfigExpireTypeModificationDate:
+            cacheContentDateKey = NSURLContentModificationDateKey;
+            break;
+        case SDImageCacheConfigExpireTypeCreationDate:
+            cacheContentDateKey = NSURLCreationDateKey;
+            break;
+        case SDImageCacheConfigExpireTypeChangeDate:
+            cacheContentDateKey = NSURLAttributeModificationDateKey;
+            break;
+        case SDImageCacheConfigExpireTypeAccessDate:
+        default:
+            cacheContentDateKey = NSURLContentAccessDateKey;
+            break;
+    }
+    
+    NSArray<NSString *> *resourceKeys = @[NSURLIsDirectoryKey, cacheContentDateKey, NSURLTotalFileAllocatedSizeKey];
+    
+    // This enumerator prefetches useful properties for our cache files.
+    NSDirectoryEnumerator<NSURL *> *fileEnumerator = [self.fileManager enumeratorAtURL:diskCacheURL
+                                               includingPropertiesForKeys:resourceKeys
+                                                                  options:NSDirectoryEnumerationSkipsHiddenFiles
+                                                             errorHandler:NULL];
+    
+    NSDate *expirationDate = (self.config.maxDiskAge < 0) ? nil: [NSDate dateWithTimeIntervalSinceNow:-self.config.maxDiskAge];
+    NSMutableDictionary<NSURL *, NSDictionary<NSString *, id> *> *cacheFiles = [NSMutableDictionary dictionary];
+    NSUInteger currentCacheSize = 0;
+    
+    // Enumerate all of the files in the cache directory.  This loop has two purposes:
+    //
+    //  1. Removing files that are older than the expiration date.
+    //  2. Storing file attributes for the size-based cleanup pass.
+    NSMutableArray<NSURL *> *urlsToDelete = [[NSMutableArray alloc] init];
+    for (NSURL *fileURL in fileEnumerator) {
+        @autoreleasepool {
+            NSError *error;
+            NSDictionary<NSString *, id> *resourceValues = [fileURL resourceValuesForKeys:resourceKeys error:&error];
+            
+            // Skip directories and errors.
+            if (error || !resourceValues || [resourceValues[NSURLIsDirectoryKey] boolValue]) {
+                continue;
+            }
+            
+            // Remove files that are older than the expiration date;
+            NSDate *modifiedDate = resourceValues[cacheContentDateKey];
+            if (expirationDate && [[modifiedDate laterDate:expirationDate] isEqualToDate:expirationDate]) {
+                [urlsToDelete addObject:fileURL];
+                continue;
+            }
+            
+            // Store a reference to this file and account for its total size.
+            NSNumber *totalAllocatedSize = resourceValues[NSURLTotalFileAllocatedSizeKey];
+            currentCacheSize += totalAllocatedSize.unsignedIntegerValue;
+            cacheFiles[fileURL] = resourceValues;
+        }
+    }
+    
+    for (NSURL *fileURL in urlsToDelete) {
+        [self.fileManager removeItemAtURL:fileURL error:nil];
+    }
+    
+    // If our remaining disk cache exceeds a configured maximum size, perform a second
+    // size-based cleanup pass.  We delete the oldest files first.
+    NSUInteger maxDiskSize = self.config.maxDiskSize;
+    if (maxDiskSize > 0 && currentCacheSize > maxDiskSize) {
+        // Target half of our maximum cache size for this cleanup pass.
+        const NSUInteger desiredCacheSize = maxDiskSize / 2;
+        
+        // Sort the remaining cache files by their last modification time or last access time (oldest first).
+        NSArray<NSURL *> *sortedFiles = [cacheFiles keysSortedByValueWithOptions:NSSortConcurrent
+                                                                 usingComparator:^NSComparisonResult(id obj1, id obj2) {
+                                                                     return [obj1[cacheContentDateKey] compare:obj2[cacheContentDateKey]];
+                                                                 }];
+        
+        // Delete files until we fall below our desired cache size.
+        for (NSURL *fileURL in sortedFiles) {
+            if ([self.fileManager removeItemAtURL:fileURL error:nil]) {
+                NSDictionary<NSString *, id> *resourceValues = cacheFiles[fileURL];
+                NSNumber *totalAllocatedSize = resourceValues[NSURLTotalFileAllocatedSizeKey];
+                currentCacheSize -= totalAllocatedSize.unsignedIntegerValue;
+                
+                if (currentCacheSize < desiredCacheSize) {
+                    break;
+                }
+            }
+        }
+    }
+}
+
+- (nullable NSString *)cachePathForKey:(NSString *)key {
+    NSParameterAssert(key);
+    return [self cachePathForKey:key inPath:self.diskCachePath];
+}
+
+- (NSUInteger)totalSize {
+    NSUInteger size = 0;
+
+    // Use URL-based enumerator instead of Path(NSString *)-based enumerator to reduce
+    // those objects(ex. NSPathStore2/_NSCFString/NSConcreteData) created during traversal.
+    // Even worse, those objects are added into AutoreleasePool, in background threads, 
+    // the time to release those objects is undifined(according to the usage of CPU)
+    // It will truely consumes a lot of VM, up to cause OOMs.
+    @autoreleasepool {
+        NSURL *pathURL = [NSURL fileURLWithPath:self.diskCachePath isDirectory:YES];
+        NSDirectoryEnumerator<NSURL *> *fileEnumerator = [self.fileManager enumeratorAtURL:pathURL
+                                                  includingPropertiesForKeys:@[NSURLFileSizeKey]
+                                                                     options:(NSDirectoryEnumerationOptions)0
+                                                                errorHandler:NULL];
+        
+        for (NSURL *fileURL in fileEnumerator) {
+            @autoreleasepool {
+                NSNumber *fileSize;
+                [fileURL getResourceValue:&fileSize forKey:NSURLFileSizeKey error:NULL];
+                size += fileSize.unsignedIntegerValue;
+            }
+        }
+    }
+    return size;
+}
+
+- (NSUInteger)totalCount {
+    NSUInteger count = 0;
+    @autoreleasepool {
+        NSURL *diskCacheURL = [NSURL fileURLWithPath:self.diskCachePath isDirectory:YES];
+        NSDirectoryEnumerator<NSURL *> *fileEnumerator = [self.fileManager enumeratorAtURL:diskCacheURL includingPropertiesForKeys:@[] options:(NSDirectoryEnumerationOptions)0 errorHandler:nil];
+        count = fileEnumerator.allObjects.count;
+    }
+    return count;
+}
+
+#pragma mark - Cache paths
+
+- (nullable NSString *)cachePathForKey:(nullable NSString *)key inPath:(nonnull NSString *)path {
+    NSString *filename = SDDiskCacheFileNameForKey(key);
+    return [path stringByAppendingPathComponent:filename];
+}
+
+- (void)moveCacheDirectoryFromPath:(nonnull NSString *)srcPath toPath:(nonnull NSString *)dstPath {
+    NSParameterAssert(srcPath);
+    NSParameterAssert(dstPath);
+    // Check if old path is equal to new path
+    if ([srcPath isEqualToString:dstPath]) {
+        return;
+    }
+    BOOL isDirectory;
+    // Check if old path is directory
+    if (![self.fileManager fileExistsAtPath:srcPath isDirectory:&isDirectory] || !isDirectory) {
+        return;
+    }
+    // Check if new path is directory
+    if (![self.fileManager fileExistsAtPath:dstPath isDirectory:&isDirectory] || !isDirectory) {
+        if (!isDirectory) {
+            // New path is not directory, remove file
+            [self.fileManager removeItemAtPath:dstPath error:nil];
+        }
+        NSString *dstParentPath = [dstPath stringByDeletingLastPathComponent];
+        // Creates any non-existent parent directories as part of creating the directory in path
+        if (![self.fileManager fileExistsAtPath:dstParentPath]) {
+            [self.fileManager createDirectoryAtPath:dstParentPath withIntermediateDirectories:YES attributes:nil error:NULL];
+        }
+        // New directory does not exist, rename directory
+        [self.fileManager moveItemAtPath:srcPath toPath:dstPath error:nil];
+        // disable iCloud backup
+        if (self.config.shouldDisableiCloud) {
+            // ignore iCloud backup resource value error
+            [[NSURL fileURLWithPath:dstPath isDirectory:YES] setResourceValue:@YES forKey:NSURLIsExcludedFromBackupKey error:nil];
+        }
+    } else {
+        // New directory exist, merge the files
+        NSURL *srcURL = [NSURL fileURLWithPath:srcPath isDirectory:YES];
+        NSDirectoryEnumerator<NSURL *> *srcDirEnumerator = [self.fileManager enumeratorAtURL:srcURL
+                                                               includingPropertiesForKeys:@[]
+                                                                                  options:(NSDirectoryEnumerationOptions)0
+                                                                             errorHandler:NULL];
+        for (NSURL *url in srcDirEnumerator) {
+            @autoreleasepool {
+                NSString *dstFilePath = [dstPath stringByAppendingPathComponent:url.lastPathComponent];
+                NSURL *dstFileURL = [NSURL fileURLWithPath:dstFilePath isDirectory:NO];
+                [self.fileManager moveItemAtURL:url toURL:dstFileURL error:nil];
+            }
+        }
+        
+        // Remove the old path
+        [self.fileManager removeItemAtURL:srcURL error:nil];
+    }
+}
+
+#pragma mark - Hash
+
+static inline NSString *SDSanitizeFileNameString(NSString * _Nullable fileName) {
+    if ([fileName length] == 0) {
+        return fileName;
+    }
+    // note: `:` is the only invalid char on Apple file system
+    // but `/` or `\` is valid
+    // \0 is also special case (which cause Foundation API treat the C string as EOF)
+    NSCharacterSet* illegalFileNameCharacters = [NSCharacterSet characterSetWithCharactersInString:@"\0:"];
+    return [[fileName componentsSeparatedByCharactersInSet:illegalFileNameCharacters] componentsJoinedByString:@""];
+}
+
+#define SD_MAX_FILE_EXTENSION_LENGTH (NAME_MAX - CC_MD5_DIGEST_LENGTH * 2 - 1)
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+static inline NSString * _Nonnull SDDiskCacheFileNameForKey(NSString * _Nullable key) {
+    const char *str = key.UTF8String;
+    if (str == NULL) {
+        str = "";
+    }
+    unsigned char r[CC_MD5_DIGEST_LENGTH];
+    CC_MD5(str, (CC_LONG)strlen(str), r);
+    NSString *ext;
+    // 1. Use URL path extname if valid
+    NSURL *keyURL = [NSURL URLWithString:key];
+    if (keyURL) {
+        ext = keyURL.pathExtension;
+    }
+    // 2. Use file extname if valid
+    if (!ext) {
+        ext = key.pathExtension;
+    }
+    // 3. Check if extname valid on file system
+    ext = SDSanitizeFileNameString(ext);
+    // File system has file name length limit, we need to check if ext is too long, we don't add it to the filename
+    if (ext.length > SD_MAX_FILE_EXTENSION_LENGTH) {
+        ext = nil;
+    }
+    NSString *filename = [NSString stringWithFormat:@"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%@",
+                          r[0], r[1], r[2], r[3], r[4], r[5], r[6], r[7], r[8], r[9], r[10],
+                          r[11], r[12], r[13], r[14], r[15], ext.length == 0 ? @"" : [NSString stringWithFormat:@".%@", ext]];
+    return filename;
+}
+#pragma clang diagnostic pop
+
+@end
diff --git a/SDWebImage/Core/SDGraphicsImageRenderer.h b/SDWebImage/Core/SDGraphicsImageRenderer.h
new file mode 100644
index 000000000..79bbef6b9
--- /dev/null
+++ b/SDWebImage/Core/SDGraphicsImageRenderer.h
@@ -0,0 +1,84 @@
+/*
+* This file is part of the SDWebImage package.
+* (c) Olivier Poitrey <rs@dailymotion.com>
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code.
+*/
+
+#import "SDWebImageCompat.h"
+
+/**
+ These following class are provided to use `UIGraphicsImageRenderer` with polyfill, which allows write cross-platform(AppKit/UIKit) code and avoid runtime version check.
+ Compared to `UIGraphicsBeginImageContext`, `UIGraphicsImageRenderer` use dynamic bitmap from your draw code to generate CGContext, not always use ARGB8888, which is more performant on RAM usage.
+ Which means, if you draw CGImage/CIImage which contains grayscale only, the underlaying bitmap context use grayscale, it's managed by system and not a fixed type. (actually, the `kCGContextTypeAutomatic`)
+ For usage, See more in Apple's documentation: https://developer.apple.com/documentation/uikit/uigraphicsimagerenderer
+ For UIKit on iOS/tvOS 10+, these method just use the same `UIGraphicsImageRenderer` API.
+ For others (macOS/watchOS or iOS/tvOS 10-), these method use the `SDImageGraphics.h` to implements the same behavior (but without dynamic bitmap support)
+*/
+
+/// A closure for drawing an image.
+typedef void (^SDGraphicsImageDrawingActions)(CGContextRef _Nonnull context);
+/// Constants that specify the color range of the image renderer context.
+typedef NS_ENUM(NSInteger, SDGraphicsImageRendererFormatRange) {
+    /// The image renderer context doesn’t specify a color range.
+    SDGraphicsImageRendererFormatRangeUnspecified = -1,
+    /// The system automatically chooses the image renderer context’s pixel format according to the color range of its content.
+    SDGraphicsImageRendererFormatRangeAutomatic = 0,
+    /// The image renderer context supports wide color.
+    SDGraphicsImageRendererFormatRangeExtended,
+    /// The image renderer context doesn’t support extended colors.
+    SDGraphicsImageRendererFormatRangeStandard
+};
+
+/// A set of drawing attributes that represent the configuration of an image renderer context.
+@interface SDGraphicsImageRendererFormat : NSObject
+
+#if SD_UIKIT
+/// The underlying uiformat for UIKit. This usage of this API should be careful, which may cause out of sync.
+@property (nonatomic, strong, nonnull) UIGraphicsImageRendererFormat *uiformat API_AVAILABLE(ios(10.0), tvos(10.0));
+#endif
+
+/// The display scale of the image renderer context.
+/// The default value is equal to the scale of the main screen.
+@property (nonatomic) CGFloat scale;
+
+/// A Boolean value indicating whether the underlying Core Graphics context has an alpha channel.
+/// The default value is NO.
+@property (nonatomic) BOOL opaque;
+
+/// Specifying whether the bitmap context should use extended color.
+/// For iOS 12+, the value is from system `preferredRange` property
+/// For iOS 10-11, the value is from system `prefersExtendedRange` property
+/// For iOS 9-, the value is `.standard`
+@property (nonatomic) SDGraphicsImageRendererFormatRange preferredRange;
+
+/// Init the default format. See each properties's default value.
+- (nonnull instancetype)init;
+
+/// Returns a new format best suited for the main screen’s current configuration.
++ (nonnull instancetype)preferredFormat;
+
+@end
+
+/// A graphics renderer for creating Core Graphics-backed images.
+@interface SDGraphicsImageRenderer : NSObject
+
+/// Creates an image renderer for drawing images of a given size.
+/// @param size The size of images output from the renderer, specified in points.
+/// @return An initialized image renderer.
+- (nonnull instancetype)initWithSize:(CGSize)size;
+
+/// Creates a new image renderer with a given size and format.
+/// @param size The size of images output from the renderer, specified in points.
+/// @param format A SDGraphicsImageRendererFormat object that encapsulates the format used to create the renderer context.
+/// @return An initialized image renderer.
+- (nonnull instancetype)initWithSize:(CGSize)size format:(nonnull SDGraphicsImageRendererFormat *)format;
+
+/// Creates an image by following a set of drawing instructions.
+/// @param actions A SDGraphicsImageDrawingActions block that, when invoked by the renderer, executes a set of drawing instructions to create the output image.
+/// @note You should not retain or use the context outside the block, it's non-escaping.
+/// @return A UIImage object created by the supplied drawing actions.
+- (nonnull UIImage *)imageWithActions:(nonnull NS_NOESCAPE SDGraphicsImageDrawingActions)actions;
+
+@end
diff --git a/SDWebImage/Core/SDGraphicsImageRenderer.m b/SDWebImage/Core/SDGraphicsImageRenderer.m
new file mode 100644
index 000000000..772ff9ae3
--- /dev/null
+++ b/SDWebImage/Core/SDGraphicsImageRenderer.m
@@ -0,0 +1,229 @@
+/*
+* This file is part of the SDWebImage package.
+* (c) Olivier Poitrey <rs@dailymotion.com>
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code.
+*/
+
+#import "SDGraphicsImageRenderer.h"
+#import "SDImageGraphics.h"
+#import "SDDeviceHelper.h"
+
+@implementation SDGraphicsImageRendererFormat
+@synthesize scale = _scale;
+@synthesize opaque = _opaque;
+@synthesize preferredRange = _preferredRange;
+
+#pragma mark - Property
+- (CGFloat)scale {
+#if SD_UIKIT
+    if (@available(iOS 10.0, tvOS 10.10, *)) {
+        return self.uiformat.scale;
+    } else {
+        return _scale;
+    }
+#else
+    return _scale;
+#endif
+}
+
+- (void)setScale:(CGFloat)scale {
+#if SD_UIKIT
+    if (@available(iOS 10.0, tvOS 10.10, *)) {
+        self.uiformat.scale = scale;
+    } else {
+        _scale = scale;
+    }
+#else
+    _scale = scale;
+#endif
+}
+
+- (BOOL)opaque {
+#if SD_UIKIT
+    if (@available(iOS 10.0, tvOS 10.10, *)) {
+        return self.uiformat.opaque;
+    } else {
+        return _opaque;
+    }
+#else
+    return _opaque;
+#endif
+}
+
+- (void)setOpaque:(BOOL)opaque {
+#if SD_UIKIT
+    if (@available(iOS 10.0, tvOS 10.10, *)) {
+        self.uiformat.opaque = opaque;
+    } else {
+        _opaque = opaque;
+    }
+#else
+    _opaque = opaque;
+#endif
+}
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+- (SDGraphicsImageRendererFormatRange)preferredRange {
+#if SD_VISION
+  return (SDGraphicsImageRendererFormatRange)self.uiformat.preferredRange;
+#elif SD_UIKIT
+    if (@available(iOS 10.0, tvOS 10.10, *)) {
+        if (@available(iOS 12.0, tvOS 12.0, *)) {
+            return (SDGraphicsImageRendererFormatRange)self.uiformat.preferredRange;
+        } else {
+            BOOL prefersExtendedRange = self.uiformat.prefersExtendedRange;
+            if (prefersExtendedRange) {
+                return SDGraphicsImageRendererFormatRangeExtended;
+            } else {
+                return SDGraphicsImageRendererFormatRangeStandard;
+            }
+        }
+    } else {
+        return _preferredRange;
+    }
+#else
+    return _preferredRange;
+#endif
+}
+
+- (void)setPreferredRange:(SDGraphicsImageRendererFormatRange)preferredRange {
+#if SD_VISION
+  self.uiformat.preferredRange = (UIGraphicsImageRendererFormatRange)preferredRange;
+#elif SD_UIKIT
+    if (@available(iOS 10.0, tvOS 10.10, *)) {
+        if (@available(iOS 12.0, tvOS 12.0, *)) {
+            self.uiformat.preferredRange = (UIGraphicsImageRendererFormatRange)preferredRange;
+        } else {
+            switch (preferredRange) {
+                case SDGraphicsImageRendererFormatRangeExtended:
+                    self.uiformat.prefersExtendedRange = YES;
+                    break;
+                case SDGraphicsImageRendererFormatRangeStandard:
+                    self.uiformat.prefersExtendedRange = NO;
+                default:
+                    // Automatic means default
+                    break;
+            }
+        }
+    } else {
+        _preferredRange = preferredRange;
+    }
+#else
+    _preferredRange = preferredRange;
+#endif
+}
+#pragma clang diagnostic pop
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+#if SD_UIKIT
+        if (@available(iOS 10.0, tvOS 10.10, *)) {
+            UIGraphicsImageRendererFormat *uiformat = [[UIGraphicsImageRendererFormat alloc] init];
+            self.uiformat = uiformat;
+        } else {
+#endif
+            CGFloat screenScale = SDDeviceHelper.screenScale;
+            self.scale = screenScale;
+            self.opaque = NO;
+#if SD_UIKIT
+        }
+#endif
+    }
+    return self;
+}
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunguarded-availability"
+- (instancetype)initForMainScreen {
+    self = [super init];
+    if (self) {
+#if SD_UIKIT
+        if (@available(iOS 10.0, tvOS 10.0, *)) {
+            UIGraphicsImageRendererFormat *uiformat;
+            // iOS 11.0.0 GM does have `preferredFormat`, but iOS 11 betas did not (argh!)
+            if ([UIGraphicsImageRenderer respondsToSelector:@selector(preferredFormat)]) {
+                uiformat = [UIGraphicsImageRendererFormat preferredFormat];
+            } else {
+                uiformat = [UIGraphicsImageRendererFormat defaultFormat];
+            }
+            self.uiformat = uiformat;
+        } else {
+#endif
+            CGFloat screenScale = SDDeviceHelper.screenScale;
+            self.scale = screenScale;
+            self.opaque = NO;
+#if SD_UIKIT
+        }
+#endif
+    }
+    return self;
+}
+#pragma clang diagnostic pop
+
++ (instancetype)preferredFormat {
+    SDGraphicsImageRendererFormat *format = [[SDGraphicsImageRendererFormat alloc] initForMainScreen];
+    return format;
+}
+
+@end
+
+@interface SDGraphicsImageRenderer ()
+@property (nonatomic, assign) CGSize size;
+@property (nonatomic, strong) SDGraphicsImageRendererFormat *format;
+#if SD_UIKIT
+@property (nonatomic, strong) UIGraphicsImageRenderer *uirenderer API_AVAILABLE(ios(10.0), tvos(10.0));
+#endif
+@end
+
+@implementation SDGraphicsImageRenderer
+
+- (instancetype)initWithSize:(CGSize)size {
+    return [self initWithSize:size format:SDGraphicsImageRendererFormat.preferredFormat];
+}
+
+- (instancetype)initWithSize:(CGSize)size format:(SDGraphicsImageRendererFormat *)format {
+    NSParameterAssert(format);
+    self = [super init];
+    if (self) {
+        self.size = size;
+        self.format = format;
+#if SD_UIKIT
+        if (@available(iOS 10.0, tvOS 10.0, *)) {
+            UIGraphicsImageRendererFormat *uiformat = format.uiformat;
+            self.uirenderer = [[UIGraphicsImageRenderer alloc] initWithSize:size format:uiformat];
+        }
+#endif
+    }
+    return self;
+}
+
+- (UIImage *)imageWithActions:(NS_NOESCAPE SDGraphicsImageDrawingActions)actions {
+    NSParameterAssert(actions);
+#if SD_UIKIT
+    if (@available(iOS 10.0, tvOS 10.0, *)) {
+        UIGraphicsImageDrawingActions uiactions = ^(UIGraphicsImageRendererContext *rendererContext) {
+            if (actions) {
+                actions(rendererContext.CGContext);
+            }
+        };
+        return [self.uirenderer imageWithActions:uiactions];
+    } else {
+#endif
+        SDGraphicsBeginImageContextWithOptions(self.size, self.format.opaque, self.format.scale);
+        CGContextRef context = SDGraphicsGetCurrentContext();
+        if (actions) {
+            actions(context);
+        }
+        UIImage *image = SDGraphicsGetImageFromCurrentImageContext();
+        SDGraphicsEndImageContext();
+        return image;
+#if SD_UIKIT
+    }
+#endif
+}
+
+@end
diff --git a/SDWebImage/Core/SDImageAPNGCoder.h b/SDWebImage/Core/SDImageAPNGCoder.h
new file mode 100644
index 000000000..f73742cbf
--- /dev/null
+++ b/SDWebImage/Core/SDImageAPNGCoder.h
@@ -0,0 +1,19 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDImageIOAnimatedCoder.h"
+
+/**
+ Built in coder using ImageIO that supports APNG encoding/decoding
+ */
+@interface SDImageAPNGCoder : SDImageIOAnimatedCoder <SDProgressiveImageCoder, SDAnimatedImageCoder>
+
+@property (nonatomic, class, readonly, nonnull) SDImageAPNGCoder *sharedCoder;
+
+@end
diff --git a/SDWebImage/Core/SDImageAPNGCoder.m b/SDWebImage/Core/SDImageAPNGCoder.m
new file mode 100644
index 000000000..b262bd3b3
--- /dev/null
+++ b/SDWebImage/Core/SDImageAPNGCoder.m
@@ -0,0 +1,58 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDImageAPNGCoder.h"
+#import "SDImageIOAnimatedCoderInternal.h"
+#if SD_MAC
+#import <CoreServices/CoreServices.h>
+#else
+#import <MobileCoreServices/MobileCoreServices.h>
+#endif
+
+@implementation SDImageAPNGCoder
+
++ (instancetype)sharedCoder {
+    static SDImageAPNGCoder *coder;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        coder = [[SDImageAPNGCoder alloc] init];
+    });
+    return coder;
+}
+
+#pragma mark - Subclass Override
+
++ (SDImageFormat)imageFormat {
+    return SDImageFormatPNG;
+}
+
++ (NSString *)imageUTType {
+    return (__bridge NSString *)kSDUTTypePNG;
+}
+
++ (NSString *)dictionaryProperty {
+    return (__bridge NSString *)kCGImagePropertyPNGDictionary;
+}
+
++ (NSString *)unclampedDelayTimeProperty {
+    return (__bridge NSString *)kCGImagePropertyAPNGUnclampedDelayTime;
+}
+
++ (NSString *)delayTimeProperty {
+    return (__bridge NSString *)kCGImagePropertyAPNGDelayTime;
+}
+
++ (NSString *)loopCountProperty {
+    return (__bridge NSString *)kCGImagePropertyAPNGLoopCount;
+}
+
++ (NSUInteger)defaultLoopCount {
+    return 0;
+}
+
+@end
diff --git a/SDWebImage/Core/SDImageAWebPCoder.h b/SDWebImage/Core/SDImageAWebPCoder.h
new file mode 100644
index 000000000..4b585a992
--- /dev/null
+++ b/SDWebImage/Core/SDImageAWebPCoder.h
@@ -0,0 +1,23 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDImageIOAnimatedCoder.h"
+
+/**
+ This coder is used for Google WebP and Animated WebP(AWebP) image format.
+ Image/IO provide the WebP decoding support in iOS 14/macOS 11/tvOS 14/watchOS 7+.
+ @note Currently Image/IO seems does not supports WebP encoding, if you need WebP encoding, use the custom codec below.
+ @note If you need to support lower firmware version for WebP, you can have a try at https://github.com/SDWebImage/SDWebImageWebPCoder
+ */
+API_AVAILABLE(ios(14.0), tvos(14.0), macos(11.0), watchos(7.0))
+@interface SDImageAWebPCoder : SDImageIOAnimatedCoder <SDProgressiveImageCoder, SDAnimatedImageCoder>
+
+@property (nonatomic, class, readonly, nonnull) SDImageAWebPCoder *sharedCoder;
+
+@end
diff --git a/SDWebImage/Core/SDImageAWebPCoder.m b/SDWebImage/Core/SDImageAWebPCoder.m
new file mode 100644
index 000000000..e58bc215c
--- /dev/null
+++ b/SDWebImage/Core/SDImageAWebPCoder.m
@@ -0,0 +1,98 @@
+/*
+* This file is part of the SDWebImage package.
+* (c) Olivier Poitrey <rs@dailymotion.com>
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code.
+*/
+
+#import "SDImageAWebPCoder.h"
+#import "SDImageIOAnimatedCoderInternal.h"
+
+// These constants are available from iOS 14+ and Xcode 12. This raw value is used for toolchain and firmware compatibility
+static NSString * kSDCGImagePropertyWebPDictionary = @"{WebP}";
+static NSString * kSDCGImagePropertyWebPLoopCount = @"LoopCount";
+static NSString * kSDCGImagePropertyWebPDelayTime = @"DelayTime";
+static NSString * kSDCGImagePropertyWebPUnclampedDelayTime = @"UnclampedDelayTime";
+
+@implementation SDImageAWebPCoder
+
++ (void)initialize {
+#if __IPHONE_14_0 || __TVOS_14_0 || __MAC_11_0 || __WATCHOS_7_0
+    // Xcode 12
+    if (@available(iOS 14, tvOS 14, macOS 11, watchOS 7, *)) {
+        // Use SDK instead of raw value
+        kSDCGImagePropertyWebPDictionary = (__bridge NSString *)kCGImagePropertyWebPDictionary;
+        kSDCGImagePropertyWebPLoopCount = (__bridge NSString *)kCGImagePropertyWebPLoopCount;
+        kSDCGImagePropertyWebPDelayTime = (__bridge NSString *)kCGImagePropertyWebPDelayTime;
+        kSDCGImagePropertyWebPUnclampedDelayTime = (__bridge NSString *)kCGImagePropertyWebPUnclampedDelayTime;
+    }
+#endif
+}
+
++ (instancetype)sharedCoder {
+    static SDImageAWebPCoder *coder;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        coder = [[SDImageAWebPCoder alloc] init];
+    });
+    return coder;
+}
+
+#pragma mark - SDImageCoder
+
+- (BOOL)canDecodeFromData:(nullable NSData *)data {
+    switch ([NSData sd_imageFormatForImageData:data]) {
+        case SDImageFormatWebP:
+            // Check WebP decoding compatibility
+            return [self.class canDecodeFromFormat:SDImageFormatWebP];
+        default:
+            return NO;
+    }
+}
+
+- (BOOL)canIncrementalDecodeFromData:(NSData *)data {
+    return [self canDecodeFromData:data];
+}
+
+- (BOOL)canEncodeToFormat:(SDImageFormat)format {
+    switch (format) {
+        case SDImageFormatWebP:
+            // Check WebP encoding compatibility
+            return [self.class canEncodeToFormat:SDImageFormatWebP];
+        default:
+            return NO;
+    }
+}
+
+#pragma mark - Subclass Override
+
++ (SDImageFormat)imageFormat {
+    return SDImageFormatWebP;
+}
+
++ (NSString *)imageUTType {
+    return (__bridge NSString *)kSDUTTypeWebP;
+}
+
++ (NSString *)dictionaryProperty {
+    return kSDCGImagePropertyWebPDictionary;
+}
+
++ (NSString *)unclampedDelayTimeProperty {
+    return kSDCGImagePropertyWebPUnclampedDelayTime;
+}
+
++ (NSString *)delayTimeProperty {
+    return kSDCGImagePropertyWebPDelayTime;
+}
+
++ (NSString *)loopCountProperty {
+    return kSDCGImagePropertyWebPLoopCount;
+}
+
++ (NSUInteger)defaultLoopCount {
+    return 0;
+}
+
+@end
diff --git a/SDWebImage/Core/SDImageCache.h b/SDWebImage/Core/SDImageCache.h
new file mode 100644
index 000000000..4083c9877
--- /dev/null
+++ b/SDWebImage/Core/SDImageCache.h
@@ -0,0 +1,482 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCompat.h"
+#import "SDWebImageDefine.h"
+#import "SDImageCacheConfig.h"
+#import "SDImageCacheDefine.h"
+#import "SDMemoryCache.h"
+#import "SDDiskCache.h"
+
+/// Image Cache Options
+typedef NS_OPTIONS(NSUInteger, SDImageCacheOptions) {
+    /**
+     * By default, we do not query image data when the image is already cached in memory. This mask can force to query image data at the same time. However, this query is asynchronously unless you specify `SDImageCacheQueryMemoryDataSync`
+     */
+    SDImageCacheQueryMemoryData = 1 << 0,
+    /**
+     * By default, when you only specify `SDImageCacheQueryMemoryData`, we query the memory image data asynchronously. Combined this mask as well to query the memory image data synchronously.
+     */
+    SDImageCacheQueryMemoryDataSync = 1 << 1,
+    /**
+     * By default, when the memory cache miss, we query the disk cache asynchronously. This mask can force to query disk cache (when memory cache miss) synchronously.
+     @note These 3 query options can be combined together. For the full list about these masks combination, see wiki page.
+     */
+    SDImageCacheQueryDiskDataSync = 1 << 2,
+    /**
+     * By default, images are decoded respecting their original size. On iOS, this flag will scale down the
+     * images to a size compatible with the constrained memory of devices.
+     */
+    SDImageCacheScaleDownLargeImages = 1 << 3,
+    /**
+     * By default, we will decode the image in the background during cache query and download from the network. This can help to improve performance because when rendering image on the screen, it need to be firstly decoded. But this happen on the main queue by Core Animation.
+     * However, this process may increase the memory usage as well. If you are experiencing a issue due to excessive memory consumption, This flag can prevent decode the image.
+     * @note 5.14.0 introduce `SDImageCoderDecodeUseLazyDecoding`, use that for better control from codec, instead of post-processing. Which acts the similar like this option but works for SDAnimatedImage as well (this one does not)
+     * @deprecated Deprecated in v5.17.0, if you don't want force-decode, pass [.imageForceDecodePolicy] = SDImageForceDecodePolicy.never.rawValue in context option
+     */
+    SDImageCacheAvoidDecodeImage API_DEPRECATED("Use SDWebImageContextImageForceDecodePolicy instead", macos(10.10, 10.10), ios(8.0, 8.0), tvos(9.0, 9.0), watchos(2.0, 2.0)) = 1 << 4,
+    /**
+     * By default, we decode the animated image. This flag can force decode the first frame only and produce the static image.
+     */
+    SDImageCacheDecodeFirstFrameOnly = 1 << 5,
+    /**
+     * By default, for `SDAnimatedImage`, we decode the animated image frame during rendering to reduce memory usage. This flag actually trigger `preloadAllAnimatedImageFrames = YES` after image load from disk cache
+     */
+    SDImageCachePreloadAllFrames = 1 << 6,
+    /**
+     * By default, when you use `SDWebImageContextAnimatedImageClass` context option (like using `SDAnimatedImageView` which designed to use `SDAnimatedImage`), we may still use `UIImage` when the memory cache hit, or image decoder is not available, to behave as a fallback solution.
+     * Using this option, can ensure we always produce image with your provided class. If failed, an error with code `SDWebImageErrorBadImageData` will be used.
+     * Note this options is not compatible with `SDImageCacheDecodeFirstFrameOnly`, which always produce a UIImage/NSImage.
+     */
+    SDImageCacheMatchAnimatedImageClass = 1 << 7,
+};
+
+/**
+ *  A token associated with each cache query. Can be used to cancel a cache query
+ */
+@interface SDImageCacheToken : NSObject <SDWebImageOperation>
+
+/**
+ Cancel the current cache query.
+ */
+- (void)cancel;
+
+/**
+ The query's cache key.
+ */
+@property (nonatomic, strong, nullable, readonly) NSString *key;
+
+@end
+
+/**
+ * SDImageCache maintains a memory cache and a disk cache. Disk cache write operations are performed
+ * asynchronous so it doesn’t add unnecessary latency to the UI.
+ */
+@interface SDImageCache : NSObject
+
+#pragma mark - Properties
+
+/**
+ *  Cache Config object - storing all kind of settings.
+ *  The property is copy so change of current config will not accidentally affect other cache's config.
+ */
+@property (nonatomic, copy, nonnull, readonly) SDImageCacheConfig *config;
+
+/**
+ * The memory cache implementation object used for current image cache.
+ * By default we use `SDMemoryCache` class, you can also use this to call your own implementation class method.
+ * @note To customize this class, check `SDImageCacheConfig.memoryCacheClass` property.
+ */
+@property (nonatomic, strong, readonly, nonnull) id<SDMemoryCache> memoryCache;
+
+/**
+ * The disk cache implementation object used for current image cache.
+ * By default we use `SDMemoryCache` class, you can also use this to call your own implementation class method.
+ * @note To customize this class, check `SDImageCacheConfig.diskCacheClass` property.
+ * @warning When calling method about read/write in disk cache, be sure to either make your disk cache implementation IO-safe or using the same access queue to avoid issues.
+ */
+@property (nonatomic, strong, readonly, nonnull) id<SDDiskCache> diskCache;
+
+/**
+ *  The disk cache's root path
+ */
+@property (nonatomic, copy, nonnull, readonly) NSString *diskCachePath;
+
+/**
+ *  The additional disk cache path to check if the query from disk cache not exist;
+ *  The `key` param is the image cache key. The returned file path will be used to load the disk cache. If return nil, ignore it.
+ *  Useful if you want to bundle pre-loaded images with your app
+ */
+@property (nonatomic, copy, nullable) SDImageCacheAdditionalCachePathBlock additionalCachePathBlock;
+
+#pragma mark - Singleton and initialization
+
+/**
+ * Returns global shared cache instance
+ */
+@property (nonatomic, class, readonly, nonnull) SDImageCache *sharedImageCache;
+
+/**
+ * Control the default disk cache directory. This will effect all the SDImageCache instance created after modification, even for shared image cache.
+ * This can be used to share the same disk cache with the App and App Extension (Today/Notification Widget) using `- [NSFileManager.containerURLForSecurityApplicationGroupIdentifier:]`.
+ * @note If you pass nil, the value will be reset to `~/Library/Caches/com.hackemist.SDImageCache`.
+ * @note We still preserve the `namespace` arg, which means, if you change this property into `/path/to/use`,  the `SDImageCache.sharedImageCache.diskCachePath` should be `/path/to/use/default` because shared image cache use `default` as namespace.
+ * Defaults to nil.
+ */
+@property (nonatomic, class, readwrite, null_resettable) NSString *defaultDiskCacheDirectory;
+
+/**
+ * Init a new cache store with a specific namespace
+ * The final disk cache directory should looks like ($directory/$namespace). And the default config of shared cache, should result in (~/Library/Caches/com.hackemist.SDImageCache/default/)
+ *
+ * @param ns The namespace to use for this cache store
+ */
+- (nonnull instancetype)initWithNamespace:(nonnull NSString *)ns;
+
+/**
+ * Init a new cache store with a specific namespace and directory.
+ * The final disk cache directory should looks like ($directory/$namespace). And the default config of shared cache, should result in (~/Library/Caches/com.hackemist.SDImageCache/default/)
+ *
+ * @param ns        The namespace to use for this cache store
+ * @param directory Directory to cache disk images in
+ */
+- (nonnull instancetype)initWithNamespace:(nonnull NSString *)ns
+                       diskCacheDirectory:(nullable NSString *)directory;
+
+/**
+ * Init a new cache store with a specific namespace, directory and config.
+ * The final disk cache directory should looks like ($directory/$namespace). And the default config of shared cache, should result in (~/Library/Caches/com.hackemist.SDImageCache/default/)
+ *
+ * @param ns          The namespace to use for this cache store
+ * @param directory   Directory to cache disk images in
+ * @param config      The cache config to be used to create the cache. You can provide custom memory cache or disk cache class in the cache config
+ */
+- (nonnull instancetype)initWithNamespace:(nonnull NSString *)ns
+                       diskCacheDirectory:(nullable NSString *)directory
+                                   config:(nullable SDImageCacheConfig *)config NS_DESIGNATED_INITIALIZER;
+
+#pragma mark - Cache paths
+
+/**
+ Get the cache path for a certain key
+ 
+ @param key The unique image cache key
+ @return The cache path. You can check `lastPathComponent` to grab the file name.
+ */
+- (nullable NSString *)cachePathForKey:(nullable NSString *)key;
+
+#pragma mark - Store Ops
+
+/**
+ * Asynchronously store an image into memory and disk cache at the given key.
+ *
+ * @param image           The image to store
+ * @param key             The unique image cache key, usually it's image absolute URL
+ * @param completionBlock A block executed after the operation is finished
+ */
+- (void)storeImage:(nullable UIImage *)image
+            forKey:(nullable NSString *)key
+        completion:(nullable SDWebImageNoParamsBlock)completionBlock;
+
+/**
+ * Asynchronously store an image into memory and disk cache at the given key.
+ *
+ * @param image           The image to store
+ * @param key             The unique image cache key, usually it's image absolute URL
+ * @param toDisk          Store the image to disk cache if YES. If NO, the completion block is called synchronously
+ * @param completionBlock A block executed after the operation is finished
+ * @note If no image data is provided and encode to disk, we will try to detect the image format (using either `sd_imageFormat` or `SDAnimatedImage` protocol method) and animation status, to choose the best matched format, including GIF, JPEG or PNG.
+ */
+- (void)storeImage:(nullable UIImage *)image
+            forKey:(nullable NSString *)key
+            toDisk:(BOOL)toDisk
+        completion:(nullable SDWebImageNoParamsBlock)completionBlock;
+
+/**
+ * Asynchronously store an image data into disk cache at the given key.
+ *
+ * @param imageData           The image data to store
+ * @param key             The unique image cache key, usually it's image absolute URL
+ * @param completionBlock A block executed after the operation is finished
+ */
+- (void)storeImageData:(nullable NSData *)imageData
+                forKey:(nullable NSString *)key
+            completion:(nullable SDWebImageNoParamsBlock)completionBlock;
+
+/**
+ * Asynchronously store an image into memory and disk cache at the given key.
+ *
+ * @param image           The image to store
+ * @param imageData       The image data as returned by the server, this representation will be used for disk storage
+ *                        instead of converting the given image object into a storable/compressed image format in order
+ *                        to save quality and CPU
+ * @param key             The unique image cache key, usually it's image absolute URL
+ * @param toDisk          Store the image to disk cache if YES. If NO, the completion block is called synchronously
+ * @param completionBlock A block executed after the operation is finished
+ * @note If no image data is provided and encode to disk, we will try to detect the image format (using either `sd_imageFormat` or `SDAnimatedImage` protocol method) and animation status, to choose the best matched format, including GIF, JPEG or PNG.
+ */
+- (void)storeImage:(nullable UIImage *)image
+         imageData:(nullable NSData *)imageData
+            forKey:(nullable NSString *)key
+            toDisk:(BOOL)toDisk
+        completion:(nullable SDWebImageNoParamsBlock)completionBlock;
+
+/**
+ * Asynchronously store an image into memory and disk cache at the given key.
+ *
+ * @param image           The image to store
+ * @param imageData       The image data as returned by the server, this representation will be used for disk storage
+ *                        instead of converting the given image object into a storable/compressed image format in order
+ *                        to save quality and CPU
+ * @param key             The unique image cache key, usually it's image absolute URL
+ * @param options A mask to specify options to use for this store
+ * @param context The context options to use. Pass `.callbackQueue` to control callback queue
+ * @param cacheType The image store op cache type
+ * @param completionBlock A block executed after the operation is finished
+ * @note If no image data is provided and encode to disk, we will try to detect the image format (using either `sd_imageFormat` or `SDAnimatedImage` protocol method) and animation status, to choose the best matched format, including GIF, JPEG or PNG.
+ */
+- (void)storeImage:(nullable UIImage *)image
+         imageData:(nullable NSData *)imageData
+            forKey:(nullable NSString *)key
+           options:(SDWebImageOptions)options
+           context:(nullable SDWebImageContext *)context
+         cacheType:(SDImageCacheType)cacheType
+        completion:(nullable SDWebImageNoParamsBlock)completionBlock;
+
+/**
+ * Synchronously store an image into memory cache at the given key.
+ *
+ * @param image  The image to store
+ * @param key    The unique image cache key, usually it's image absolute URL
+ */
+- (void)storeImageToMemory:(nullable UIImage*)image
+                    forKey:(nullable NSString *)key;
+
+/**
+ * Synchronously store an image data into disk cache at the given key.
+ *
+ * @param imageData  The image data to store
+ * @param key        The unique image cache key, usually it's image absolute URL
+ * @note In history, when disk cache hit, the image will write back into memory cache, which is mostly unwanted behavior. From new version this behavior is removed.
+ */
+- (void)storeImageDataToDisk:(nullable NSData *)imageData
+                      forKey:(nullable NSString *)key;
+
+
+#pragma mark - Contains and Check Ops
+
+/**
+ *  Asynchronously check if image exists in disk cache already (does not load the image)
+ *
+ *  @param key             the key describing the url
+ *  @param completionBlock the block to be executed when the check is done.
+ *  @note the completion block will be always executed on the main queue
+ */
+- (void)diskImageExistsWithKey:(nullable NSString *)key completion:(nullable SDImageCacheCheckCompletionBlock)completionBlock;
+
+/**
+ *  Synchronously check if image data exists in disk cache already (does not load the image)
+ *
+ *  @param key             the key describing the url
+ */
+- (BOOL)diskImageDataExistsWithKey:(nullable NSString *)key;
+
+#pragma mark - Query and Retrieve Ops
+
+/**
+ * Synchronously query the image data for the given key in disk cache. You can decode the image data to image after loaded.
+ *
+ *  @param key The unique key used to store the wanted image
+ *  @return The image data for the given key, or nil if not found.
+ */
+- (nullable NSData *)diskImageDataForKey:(nullable NSString *)key;
+
+/**
+ * Asynchronously query the image data for the given key in disk cache. You can decode the image data to image after loaded.
+ *
+ *  @param key The unique key used to store the wanted image
+ *  @param completionBlock the block to be executed when the query is done.
+ *  @note the completion block will be always executed on the main queue
+ */
+- (void)diskImageDataQueryForKey:(nullable NSString *)key completion:(nullable SDImageCacheQueryDataCompletionBlock)completionBlock;
+
+/**
+ * Asynchronously queries the cache with operation and call the completion when done.
+ *
+ * @param key       The unique key used to store the wanted image. If you want transformed or thumbnail image, calculate the key with `SDTransformedKeyForKey`, `SDThumbnailedKeyForKey`, or generate the cache key from url with `cacheKeyForURL:context:`.
+ * @param doneBlock The completion block. Will not get called if the operation is cancelled
+ *
+ * @return a SDImageCacheToken instance containing the cache operation, will callback immediately when cancelled
+ * @note In history, when disk cache hit, the image will write back into memory cache, which is mostly unwanted behavior. From new version this behavior is removed.
+ */
+- (nullable SDImageCacheToken *)queryCacheOperationForKey:(nullable NSString *)key done:(nullable SDImageCacheQueryCompletionBlock)doneBlock;
+
+/**
+ * Asynchronously queries the cache with operation and call the completion when done.
+ *
+ * @param key       The unique key used to store the wanted image. If you want transformed or thumbnail image, calculate the key with `SDTransformedKeyForKey`, `SDThumbnailedKeyForKey`, or generate the cache key from url with `cacheKeyForURL:context:`.
+ * @param options   A mask to specify options to use for this cache query
+ * @param doneBlock The completion block. Will not get called if the operation is cancelled
+ *
+ * @return a SDImageCacheToken instance containing the cache operation, will callback immediately when cancelled
+ * @warning If you query with thumbnail cache key, you'd better not pass the thumbnail pixel size context, which is undefined behavior.
+ * @note In history, when disk cache hit, the image will write back into memory cache, which is mostly unwanted behavior. From new version this behavior is removed.
+ */
+- (nullable SDImageCacheToken *)queryCacheOperationForKey:(nullable NSString *)key options:(SDImageCacheOptions)options done:(nullable SDImageCacheQueryCompletionBlock)doneBlock;
+
+/**
+ * Asynchronously queries the cache with operation and call the completion when done.
+ *
+ * @param key       The unique key used to store the wanted image. If you want transformed or thumbnail image, calculate the key with `SDTransformedKeyForKey`, `SDThumbnailedKeyForKey`, or generate the cache key from url with `cacheKeyForURL:context:`.
+ * @param options   A mask to specify options to use for this cache query
+ * @param context   A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
+ * @param doneBlock The completion block. Will not get called if the operation is cancelled
+ *
+ * @return a SDImageCacheToken instance containing the cache operation, will callback immediately when cancellederation, will callback immediately when cancelled
+ * @warning If you query with thumbnail cache key, you'd better not pass the thumbnail pixel size context, which is undefined behavior.
+ * @note In history, when disk cache hit, the image will write back into memory cache, which is mostly unwanted behavior. From new version this behavior is removed.
+ */
+- (nullable SDImageCacheToken *)queryCacheOperationForKey:(nullable NSString *)key options:(SDImageCacheOptions)options context:(nullable SDWebImageContext *)context done:(nullable SDImageCacheQueryCompletionBlock)doneBlock;
+
+/**
+ * Asynchronously queries the cache with operation and call the completion when done.
+ *
+ * @param key       The unique key used to store the wanted image. If you want transformed or thumbnail image, calculate the key with `SDTransformedKeyForKey`, `SDThumbnailedKeyForKey`, or generate the cache key from url with `cacheKeyForURL:context:`.
+ * @param options   A mask to specify options to use for this cache query
+ * @param context   A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
+ * @param queryCacheType Specify where to query the cache from. By default we use `.all`, which means both memory cache and disk cache. You can choose to query memory only or disk only as well. Pass `.none` is invalid and callback with nil immediately.
+ * @param doneBlock The completion block. Will not get called if the operation is cancelled
+ *
+ * @return a SDImageCacheToken instance containing the cache operation, will callback immediately when cancelled
+ * @warning If you query with thumbnail cache key, you'd better not pass the thumbnail pixel size context, which is undefined behavior.
+ * @note In history, when disk cache hit, the image will write back into memory cache, which is mostly unwanted behavior. From new version this behavior is removed.
+ */
+- (nullable SDImageCacheToken *)queryCacheOperationForKey:(nullable NSString *)key options:(SDImageCacheOptions)options context:(nullable SDWebImageContext *)context cacheType:(SDImageCacheType)queryCacheType done:(nullable SDImageCacheQueryCompletionBlock)doneBlock;
+
+/**
+ * Synchronously query the memory cache.
+ *
+ * @param key The unique key used to store the image
+ * @return The image for the given key, or nil if not found.
+ */
+- (nullable UIImage *)imageFromMemoryCacheForKey:(nullable NSString *)key;
+
+/**
+ * Synchronously query the disk cache.
+ *
+ * @param key The unique key used to store the image
+ * @return The image for the given key, or nil if not found.
+ */
+- (nullable UIImage *)imageFromDiskCacheForKey:(nullable NSString *)key;
+
+/**
+ * Synchronously query the disk cache. With the options and context which may effect the image generation. (Such as transformer, animated image, thumbnail, etc)
+ *
+ * @param key The unique key used to store the image
+ * @param options   A mask to specify options to use for this cache query
+ * @param context   A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
+ * @return The image for the given key, or nil if not found.
+ */
+- (nullable UIImage *)imageFromDiskCacheForKey:(nullable NSString *)key options:(SDImageCacheOptions)options context:(nullable SDWebImageContext *)context;
+
+/**
+ * Synchronously query the cache (memory and or disk) after checking the memory cache.
+ *
+ * @param key The unique key used to store the image
+ * @return The image for the given key, or nil if not found.
+ */
+- (nullable UIImage *)imageFromCacheForKey:(nullable NSString *)key;
+
+/**
+ * Synchronously query the cache (memory and or disk) after checking the memory cache. With the options and context which may effect the image generation. (Such as transformer, animated image, thumbnail, etc)
+ *
+ * @param key The unique key used to store the image
+ * @param options   A mask to specify options to use for this cache query
+ * @param context   A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
+ * @return The image for the given key, or nil if not found.
+ */
+- (nullable UIImage *)imageFromCacheForKey:(nullable NSString *)key options:(SDImageCacheOptions)options context:(nullable SDWebImageContext *)context;
+
+#pragma mark - Remove Ops
+
+/**
+ * Asynchronously remove the image from memory and disk cache
+ *
+ * @param key             The unique image cache key
+ * @param completion      A block that should be executed after the image has been removed (optional)
+ */
+- (void)removeImageForKey:(nullable NSString *)key withCompletion:(nullable SDWebImageNoParamsBlock)completion;
+
+/**
+ * Asynchronously remove the image from memory and optionally disk cache
+ *
+ * @param key             The unique image cache key
+ * @param fromDisk        Also remove cache entry from disk if YES. If NO, the completion block is called synchronously
+ * @param completion      A block that should be executed after the image has been removed (optional)
+ */
+- (void)removeImageForKey:(nullable NSString *)key fromDisk:(BOOL)fromDisk withCompletion:(nullable SDWebImageNoParamsBlock)completion;
+
+/**
+ Synchronously remove the image from memory cache.
+ 
+ @param key The unique image cache key
+ */
+- (void)removeImageFromMemoryForKey:(nullable NSString *)key;
+
+/**
+ Synchronously remove the image from disk cache.
+ 
+ @param key The unique image cache key
+ */
+- (void)removeImageFromDiskForKey:(nullable NSString *)key;
+
+#pragma mark - Cache clean Ops
+
+/**
+ * Synchronously Clear all memory cached images
+ */
+- (void)clearMemory;
+
+/**
+ * Asynchronously clear all disk cached images. Non-blocking method - returns immediately.
+ * @param completion    A block that should be executed after cache expiration completes (optional)
+ */
+- (void)clearDiskOnCompletion:(nullable SDWebImageNoParamsBlock)completion;
+
+/**
+ * Asynchronously remove all expired cached image from disk. Non-blocking method - returns immediately.
+ * @param completionBlock A block that should be executed after cache expiration completes (optional)
+ */
+- (void)deleteOldFilesWithCompletionBlock:(nullable SDWebImageNoParamsBlock)completionBlock;
+
+#pragma mark - Cache Info
+
+/**
+ * Get the total bytes size of images in the disk cache
+ */
+- (NSUInteger)totalDiskSize;
+
+/**
+ * Get the number of images in the disk cache
+ */
+- (NSUInteger)totalDiskCount;
+
+/**
+ * Asynchronously calculate the disk cache's size.
+ */
+- (void)calculateSizeWithCompletionBlock:(nullable SDImageCacheCalculateSizeBlock)completionBlock;
+
+@end
+
+/**
+ * SDImageCache is the built-in image cache implementation for web image manager. It adopts `SDImageCache` protocol to provide the function for web image manager to use for image loading process.
+ */
+@interface SDImageCache (SDImageCache) <SDImageCache>
+
+@end
diff --git a/SDWebImage/Core/SDImageCache.m b/SDWebImage/Core/SDImageCache.m
new file mode 100644
index 000000000..33f32650b
--- /dev/null
+++ b/SDWebImage/Core/SDImageCache.m
@@ -0,0 +1,1031 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDImageCache.h"
+#import "SDInternalMacros.h"
+#import "NSImage+Compatibility.h"
+#import "UIImage+MultiFormat.h"
+#import "SDImageCodersManager.h"
+#import "SDImageCoderHelper.h"
+#import "SDAnimatedImage.h"
+#import "UIImage+MemoryCacheCost.h"
+#import "UIImage+Metadata.h"
+#import "UIImage+ExtendedCacheData.h"
+#import "SDCallbackQueue.h"
+
+// TODO, remove this
+static BOOL SDIsThumbnailKey(NSString *key) {
+    if ([key rangeOfString:@"-Thumbnail("].location != NSNotFound) {
+        return YES;
+    }
+    return NO;
+}
+
+@interface SDImageCacheToken ()
+
+@property (nonatomic, strong, nullable, readwrite) NSString *key;
+@property (nonatomic, assign, getter=isCancelled) BOOL cancelled;
+@property (nonatomic, copy, nullable) SDImageCacheQueryCompletionBlock doneBlock;
+@property (nonatomic, strong, nullable) SDCallbackQueue *callbackQueue;
+
+@end
+
+@implementation SDImageCacheToken
+
+-(instancetype)initWithDoneBlock:(nullable SDImageCacheQueryCompletionBlock)doneBlock {
+    self = [super init];
+    if (self) {
+        self.doneBlock = doneBlock;
+    }
+    return self;
+}
+
+- (void)cancel {
+    @synchronized (self) {
+        if (self.isCancelled) {
+            return;
+        }
+        self.cancelled = YES;
+        
+        SDImageCacheQueryCompletionBlock doneBlock = self.doneBlock;
+        self.doneBlock = nil;
+        if (doneBlock) {
+            [(self.callbackQueue ?: SDCallbackQueue.mainQueue) async:^{
+                doneBlock(nil, nil, SDImageCacheTypeNone);
+            }];
+        }
+    }
+}
+
+@end
+
+static NSString * _defaultDiskCacheDirectory;
+
+@interface SDImageCache ()
+
+#pragma mark - Properties
+@property (nonatomic, strong, readwrite, nonnull) id<SDMemoryCache> memoryCache;
+@property (nonatomic, strong, readwrite, nonnull) id<SDDiskCache> diskCache;
+@property (nonatomic, copy, readwrite, nonnull) SDImageCacheConfig *config;
+@property (nonatomic, copy, readwrite, nonnull) NSString *diskCachePath;
+@property (nonatomic, strong, nonnull) dispatch_queue_t ioQueue;
+
+@end
+
+
+@implementation SDImageCache
+
+#pragma mark - Singleton, init, dealloc
+
++ (nonnull instancetype)sharedImageCache {
+    static dispatch_once_t once;
+    static id instance;
+    dispatch_once(&once, ^{
+        instance = [self new];
+    });
+    return instance;
+}
+
++ (NSString *)defaultDiskCacheDirectory {
+    if (!_defaultDiskCacheDirectory) {
+        _defaultDiskCacheDirectory = [[self userCacheDirectory] stringByAppendingPathComponent:@"com.hackemist.SDImageCache"];
+    }
+    return _defaultDiskCacheDirectory;
+}
+
++ (void)setDefaultDiskCacheDirectory:(NSString *)defaultDiskCacheDirectory {
+    _defaultDiskCacheDirectory = [defaultDiskCacheDirectory copy];
+}
+
+- (instancetype)init {
+    return [self initWithNamespace:@"default"];
+}
+
+- (nonnull instancetype)initWithNamespace:(nonnull NSString *)ns {
+    return [self initWithNamespace:ns diskCacheDirectory:nil];
+}
+
+- (nonnull instancetype)initWithNamespace:(nonnull NSString *)ns
+                       diskCacheDirectory:(nullable NSString *)directory {
+    return [self initWithNamespace:ns diskCacheDirectory:directory config:SDImageCacheConfig.defaultCacheConfig];
+}
+
+- (nonnull instancetype)initWithNamespace:(nonnull NSString *)ns
+                       diskCacheDirectory:(nullable NSString *)directory
+                                   config:(nullable SDImageCacheConfig *)config {
+    if ((self = [super init])) {
+        NSAssert(ns, @"Cache namespace should not be nil");
+        
+        if (!config) {
+            config = SDImageCacheConfig.defaultCacheConfig;
+        }
+        _config = [config copy];
+        
+        // Create IO queue
+        dispatch_queue_attr_t ioQueueAttributes = _config.ioQueueAttributes;
+        _ioQueue = dispatch_queue_create("com.hackemist.SDImageCache.ioQueue", ioQueueAttributes);
+        NSAssert(_ioQueue, @"The IO queue should not be nil. Your configured `ioQueueAttributes` may be wrong");
+        
+        // Init the memory cache
+        NSAssert([config.memoryCacheClass conformsToProtocol:@protocol(SDMemoryCache)], @"Custom memory cache class must conform to `SDMemoryCache` protocol");
+        _memoryCache = [[config.memoryCacheClass alloc] initWithConfig:_config];
+        
+        // Init the disk cache
+        if (!directory) {
+            // Use default disk cache directory
+            directory = [self.class defaultDiskCacheDirectory];
+        }
+        _diskCachePath = [directory stringByAppendingPathComponent:ns];
+        
+        NSAssert([config.diskCacheClass conformsToProtocol:@protocol(SDDiskCache)], @"Custom disk cache class must conform to `SDDiskCache` protocol");
+        _diskCache = [[config.diskCacheClass alloc] initWithCachePath:_diskCachePath config:_config];
+        
+        // Check and migrate disk cache directory if need
+        [self migrateDiskCacheDirectory];
+
+#if SD_UIKIT
+        // Subscribe to app events
+        [[NSNotificationCenter defaultCenter] addObserver:self
+                                                 selector:@selector(applicationWillTerminate:)
+                                                     name:UIApplicationWillTerminateNotification
+                                                   object:nil];
+
+        [[NSNotificationCenter defaultCenter] addObserver:self
+                                                 selector:@selector(applicationDidEnterBackground:)
+                                                     name:UIApplicationDidEnterBackgroundNotification
+                                                   object:nil];
+#endif
+#if SD_MAC
+        [[NSNotificationCenter defaultCenter] addObserver:self
+                                                 selector:@selector(applicationWillTerminate:)
+                                                     name:NSApplicationWillTerminateNotification
+                                                   object:nil];
+#endif
+    }
+
+    return self;
+}
+
+- (void)dealloc {
+    [[NSNotificationCenter defaultCenter] removeObserver:self];
+}
+
+#pragma mark - Cache paths
+
+- (nullable NSString *)cachePathForKey:(nullable NSString *)key {
+    if (!key) {
+        return nil;
+    }
+    return [self.diskCache cachePathForKey:key];
+}
+
++ (nullable NSString *)userCacheDirectory {
+    NSArray<NSString *> *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
+    return paths.firstObject;
+}
+
+- (void)migrateDiskCacheDirectory {
+    if ([self.diskCache isKindOfClass:[SDDiskCache class]]) {
+        static dispatch_once_t onceToken;
+        dispatch_once(&onceToken, ^{
+            // ~/Library/Caches/com.hackemist.SDImageCache/default/
+            NSString *newDefaultPath = [[[self.class userCacheDirectory] stringByAppendingPathComponent:@"com.hackemist.SDImageCache"] stringByAppendingPathComponent:@"default"];
+            // ~/Library/Caches/default/com.hackemist.SDWebImageCache.default/
+            NSString *oldDefaultPath = [[[self.class userCacheDirectory] stringByAppendingPathComponent:@"default"] stringByAppendingPathComponent:@"com.hackemist.SDWebImageCache.default"];
+            dispatch_async(self.ioQueue, ^{
+                [((SDDiskCache *)self.diskCache) moveCacheDirectoryFromPath:oldDefaultPath toPath:newDefaultPath];
+            });
+        });
+    }
+}
+
+#pragma mark - Store Ops
+
+- (void)storeImage:(nullable UIImage *)image
+            forKey:(nullable NSString *)key
+        completion:(nullable SDWebImageNoParamsBlock)completionBlock {
+    [self storeImage:image imageData:nil forKey:key options:0 context:nil cacheType:SDImageCacheTypeAll completion:completionBlock];
+}
+
+- (void)storeImage:(nullable UIImage *)image
+            forKey:(nullable NSString *)key
+            toDisk:(BOOL)toDisk
+        completion:(nullable SDWebImageNoParamsBlock)completionBlock {
+    [self storeImage:image imageData:nil forKey:key options:0 context:nil cacheType:(toDisk ? SDImageCacheTypeAll : SDImageCacheTypeMemory) completion:completionBlock];
+}
+
+- (void)storeImageData:(nullable NSData *)imageData
+                forKey:(nullable NSString *)key
+            completion:(nullable SDWebImageNoParamsBlock)completionBlock {
+    [self storeImage:nil imageData:imageData forKey:key options:0 context:nil cacheType:SDImageCacheTypeAll completion:completionBlock];
+}
+
+- (void)storeImage:(nullable UIImage *)image
+         imageData:(nullable NSData *)imageData
+            forKey:(nullable NSString *)key
+            toDisk:(BOOL)toDisk
+        completion:(nullable SDWebImageNoParamsBlock)completionBlock {
+    [self storeImage:image imageData:imageData forKey:key options:0 context:nil cacheType:(toDisk ? SDImageCacheTypeAll : SDImageCacheTypeMemory) completion:completionBlock];
+}
+
+- (void)storeImage:(nullable UIImage *)image
+         imageData:(nullable NSData *)imageData
+            forKey:(nullable NSString *)key
+           options:(SDWebImageOptions)options
+           context:(nullable SDWebImageContext *)context
+         cacheType:(SDImageCacheType)cacheType
+        completion:(nullable SDWebImageNoParamsBlock)completionBlock {
+    if ((!image && !imageData) || !key) {
+        if (completionBlock) {
+            completionBlock();
+        }
+        return;
+    }
+    BOOL toMemory = cacheType == SDImageCacheTypeMemory || cacheType == SDImageCacheTypeAll;
+    BOOL toDisk = cacheType == SDImageCacheTypeDisk || cacheType == SDImageCacheTypeAll;
+    // if memory cache is enabled
+    if (image && toMemory && self.config.shouldCacheImagesInMemory) {
+        NSUInteger cost = image.sd_memoryCost;
+        [self.memoryCache setObject:image forKey:key cost:cost];
+    }
+    
+    if (!toDisk) {
+        if (completionBlock) {
+            completionBlock();
+        }
+        return;
+    }
+    NSData *data = imageData;
+    if (image.sd_isThumbnail && SDIsThumbnailKey(key)) {
+        // Currently we have no solid way to store thumbnail image's correct data
+        data = nil;
+    } else if (!data && [image respondsToSelector:@selector(animatedImageData)]) {
+        // If image is custom animated image class, prefer its original animated data
+        data = [((id<SDAnimatedImage>)image) animatedImageData];
+    }
+    SDCallbackQueue *queue = context[SDWebImageContextCallbackQueue];
+    if (!data && image) {
+        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
+            // Check image's associated image format, may return .undefined
+            SDImageFormat format = image.sd_imageFormat;
+            if (format == SDImageFormatUndefined) {
+                // If image is animated, use GIF (APNG may be better, but has bugs before macOS 10.14)
+                if (image.sd_imageFrameCount > 1) {
+                    if (@available(iOS 12.0, tvOS 12.0, macOS 10.14, watchOS 5.0, *)) {
+                        format = SDImageFormatPNG;
+                    } else {
+                        format = SDImageFormatGIF;
+                    }
+                } else {
+                    // If we do not have any data to detect image format, check whether it contains alpha channel to use PNG or JPEG format
+                    format = [SDImageCoderHelper CGImageContainsAlpha:image.CGImage] ? SDImageFormatPNG : SDImageFormatJPEG;
+                }
+            }
+            NSData *encodedData;
+            if ([image respondsToSelector:@selector(animatedImageData)]) {
+                // This API will encode the animation for `SDAnimatedImage` with GIF format
+                encodedData = [image sd_imageDataAsFormat:format];
+            } else {
+                id<SDImageCoder> imageCoder = context[SDWebImageContextImageCoder];
+                if (!imageCoder) {
+                    imageCoder = [SDImageCodersManager sharedManager];
+                }
+                encodedData = [imageCoder encodedDataWithImage:image format:format options:context[SDWebImageContextImageEncodeOptions]];
+            }
+            dispatch_async(self.ioQueue, ^{
+                [self _storeImageDataToDisk:encodedData forKey:key];
+                [self _archivedDataWithImage:image forKey:key];
+                if (completionBlock) {
+                    [(queue ?: SDCallbackQueue.mainQueue) async:^{
+                        completionBlock();
+                    }];
+                }
+            });
+        });
+    } else {
+        dispatch_async(self.ioQueue, ^{
+            [self _storeImageDataToDisk:data forKey:key];
+            [self _archivedDataWithImage:image forKey:key];
+            if (completionBlock) {
+                [(queue ?: SDCallbackQueue.mainQueue) async:^{
+                    completionBlock();
+                }];
+            }
+        });
+    }
+}
+
+- (void)_archivedDataWithImage:(UIImage *)image forKey:(NSString *)key {
+    if (!image || !key) {
+        return;
+    }
+    // Check extended data
+    id extendedObject = image.sd_extendedObject;
+    if (![extendedObject conformsToProtocol:@protocol(NSCoding)]) {
+        return;
+    }
+    NSData *extendedData;
+    if (@available(iOS 11, tvOS 11, macOS 10.13, watchOS 4, *)) {
+        NSError *error;
+        extendedData = [NSKeyedArchiver archivedDataWithRootObject:extendedObject requiringSecureCoding:NO error:&error];
+        if (error) {
+            SD_LOG("NSKeyedArchiver archive failed with error: %@", error);
+        }
+    } else {
+        @try {
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+            extendedData = [NSKeyedArchiver archivedDataWithRootObject:extendedObject];
+#pragma clang diagnostic pop
+        } @catch (NSException *exception) {
+            SD_LOG("NSKeyedArchiver archive failed with exception: %@", exception);
+        }
+    }
+    if (extendedData) {
+        [self.diskCache setExtendedData:extendedData forKey:key];
+    }
+}
+
+- (void)storeImageToMemory:(UIImage *)image forKey:(NSString *)key {
+    if (!image || !key) {
+        return;
+    }
+    NSUInteger cost = image.sd_memoryCost;
+    [self.memoryCache setObject:image forKey:key cost:cost];
+}
+
+- (void)storeImageDataToDisk:(nullable NSData *)imageData
+                      forKey:(nullable NSString *)key {
+    if (!imageData || !key) {
+        return;
+    }
+    
+    dispatch_sync(self.ioQueue, ^{
+        [self _storeImageDataToDisk:imageData forKey:key];
+    });
+}
+
+// Make sure to call from io queue by caller
+- (void)_storeImageDataToDisk:(nullable NSData *)imageData forKey:(nullable NSString *)key {
+    if (!imageData || !key) {
+        return;
+    }
+    
+    [self.diskCache setData:imageData forKey:key];
+}
+
+#pragma mark - Query and Retrieve Ops
+
+- (void)diskImageExistsWithKey:(nullable NSString *)key completion:(nullable SDImageCacheCheckCompletionBlock)completionBlock {
+    dispatch_async(self.ioQueue, ^{
+        BOOL exists = [self _diskImageDataExistsWithKey:key];
+        if (completionBlock) {
+            dispatch_async(dispatch_get_main_queue(), ^{
+                completionBlock(exists);
+            });
+        }
+    });
+}
+
+- (BOOL)diskImageDataExistsWithKey:(nullable NSString *)key {
+    if (!key) {
+        return NO;
+    }
+    
+    __block BOOL exists = NO;
+    dispatch_sync(self.ioQueue, ^{
+        exists = [self _diskImageDataExistsWithKey:key];
+    });
+    
+    return exists;
+}
+
+// Make sure to call from io queue by caller
+- (BOOL)_diskImageDataExistsWithKey:(nullable NSString *)key {
+    if (!key) {
+        return NO;
+    }
+    
+    return [self.diskCache containsDataForKey:key];
+}
+
+- (void)diskImageDataQueryForKey:(NSString *)key completion:(SDImageCacheQueryDataCompletionBlock)completionBlock {
+    dispatch_async(self.ioQueue, ^{
+        NSData *imageData = [self diskImageDataBySearchingAllPathsForKey:key];
+        if (completionBlock) {
+            dispatch_async(dispatch_get_main_queue(), ^{
+                completionBlock(imageData);
+            });
+        }
+    });
+}
+
+- (nullable NSData *)diskImageDataForKey:(nullable NSString *)key {
+    if (!key) {
+        return nil;
+    }
+    __block NSData *imageData = nil;
+    dispatch_sync(self.ioQueue, ^{
+        imageData = [self diskImageDataBySearchingAllPathsForKey:key];
+    });
+    
+    return imageData;
+}
+
+- (nullable UIImage *)imageFromMemoryCacheForKey:(nullable NSString *)key {
+    return [self.memoryCache objectForKey:key];
+}
+
+- (nullable UIImage *)imageFromDiskCacheForKey:(nullable NSString *)key {
+    return [self imageFromDiskCacheForKey:key options:0 context:nil];
+}
+
+- (nullable UIImage *)imageFromDiskCacheForKey:(nullable NSString *)key options:(SDImageCacheOptions)options context:(nullable SDWebImageContext *)context {
+    if (!key) {
+        return nil;
+    }
+    NSData *data = [self diskImageDataForKey:key];
+    UIImage *diskImage = [self diskImageForKey:key data:data options:options context:context];
+
+    return diskImage;
+}
+
+- (nullable UIImage *)imageFromCacheForKey:(nullable NSString *)key {
+    return [self imageFromCacheForKey:key options:0 context:nil];
+}
+
+- (nullable UIImage *)imageFromCacheForKey:(nullable NSString *)key options:(SDImageCacheOptions)options context:(nullable SDWebImageContext *)context {
+    // First check the in-memory cache...
+    UIImage *image = [self imageFromMemoryCacheForKey:key];
+    if (image) {
+        if (options & SDImageCacheDecodeFirstFrameOnly) {
+            // Ensure static image
+            if (image.sd_imageFrameCount > 1) {
+#if SD_MAC
+                image = [[NSImage alloc] initWithCGImage:image.CGImage scale:image.scale orientation:kCGImagePropertyOrientationUp];
+#else
+                image = [[UIImage alloc] initWithCGImage:image.CGImage scale:image.scale orientation:image.imageOrientation];
+#endif
+            }
+        } else if (options & SDImageCacheMatchAnimatedImageClass) {
+            // Check image class matching
+            Class animatedImageClass = image.class;
+            Class desiredImageClass = context[SDWebImageContextAnimatedImageClass];
+            if (desiredImageClass && ![animatedImageClass isSubclassOfClass:desiredImageClass]) {
+                image = nil;
+            }
+        }
+    }
+    
+    // Since we don't need to query imageData, return image if exist
+    if (image) {
+        return image;
+    }
+    
+    // Second check the disk cache...
+    image = [self imageFromDiskCacheForKey:key options:options context:context];
+    return image;
+}
+
+- (nullable NSData *)diskImageDataBySearchingAllPathsForKey:(nullable NSString *)key {
+    if (!key) {
+        return nil;
+    }
+    
+    NSData *data = [self.diskCache dataForKey:key];
+    if (data) {
+        return data;
+    }
+    
+    // Addtional cache path for custom pre-load cache
+    if (self.additionalCachePathBlock) {
+        NSString *filePath = self.additionalCachePathBlock(key);
+        if (filePath) {
+            data = [NSData dataWithContentsOfFile:filePath options:self.config.diskCacheReadingOptions error:nil];
+        }
+    }
+
+    return data;
+}
+
+- (nullable UIImage *)diskImageForKey:(nullable NSString *)key {
+    if (!key) {
+        return nil;
+    }
+    NSData *data = [self diskImageDataForKey:key];
+    return [self diskImageForKey:key data:data options:0 context:nil];
+}
+
+- (nullable UIImage *)diskImageForKey:(nullable NSString *)key data:(nullable NSData *)data options:(SDImageCacheOptions)options context:(SDWebImageContext *)context {
+    if (!data) {
+        return nil;
+    }
+    UIImage *image = SDImageCacheDecodeImageData(data, key, [[self class] imageOptionsFromCacheOptions:options], context);
+    [self _unarchiveObjectWithImage:image forKey:key];
+    return image;
+}
+
+- (void)_unarchiveObjectWithImage:(UIImage *)image forKey:(NSString *)key {
+    if (!image || !key) {
+        return;
+    }
+    // Check extended data
+    NSData *extendedData = [self.diskCache extendedDataForKey:key];
+    if (!extendedData) {
+        return;
+    }
+    id extendedObject;
+    if (@available(iOS 11, tvOS 11, macOS 10.13, watchOS 4, *)) {
+        NSError *error;
+        NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingFromData:extendedData error:&error];
+        unarchiver.requiresSecureCoding = NO;
+        extendedObject = [unarchiver decodeTopLevelObjectForKey:NSKeyedArchiveRootObjectKey error:&error];
+        if (error) {
+            SD_LOG("NSKeyedUnarchiver unarchive failed with error: %@", error);
+        }
+    } else {
+        @try {
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+            extendedObject = [NSKeyedUnarchiver unarchiveObjectWithData:extendedData];
+#pragma clang diagnostic pop
+        } @catch (NSException *exception) {
+            SD_LOG("NSKeyedUnarchiver unarchive failed with exception: %@", exception);
+        }
+    }
+    image.sd_extendedObject = extendedObject;
+}
+
+- (nullable SDImageCacheToken *)queryCacheOperationForKey:(NSString *)key done:(SDImageCacheQueryCompletionBlock)doneBlock {
+    return [self queryCacheOperationForKey:key options:0 done:doneBlock];
+}
+
+- (nullable SDImageCacheToken *)queryCacheOperationForKey:(NSString *)key options:(SDImageCacheOptions)options done:(SDImageCacheQueryCompletionBlock)doneBlock {
+    return [self queryCacheOperationForKey:key options:options context:nil done:doneBlock];
+}
+
+- (nullable SDImageCacheToken *)queryCacheOperationForKey:(nullable NSString *)key options:(SDImageCacheOptions)options context:(nullable SDWebImageContext *)context done:(nullable SDImageCacheQueryCompletionBlock)doneBlock {
+    return [self queryCacheOperationForKey:key options:options context:context cacheType:SDImageCacheTypeAll done:doneBlock];
+}
+
+- (nullable SDImageCacheToken *)queryCacheOperationForKey:(nullable NSString *)key options:(SDImageCacheOptions)options context:(nullable SDWebImageContext *)context cacheType:(SDImageCacheType)queryCacheType done:(nullable SDImageCacheQueryCompletionBlock)doneBlock {
+    if (!key) {
+        if (doneBlock) {
+            doneBlock(nil, nil, SDImageCacheTypeNone);
+        }
+        return nil;
+    }
+    // Invalid cache type
+    if (queryCacheType == SDImageCacheTypeNone) {
+        if (doneBlock) {
+            doneBlock(nil, nil, SDImageCacheTypeNone);
+        }
+        return nil;
+    }
+    
+    // First check the in-memory cache...
+    UIImage *image;
+    BOOL shouldQueryDiskOnly = (queryCacheType == SDImageCacheTypeDisk);
+    if (!shouldQueryDiskOnly) {
+        image = [self imageFromMemoryCacheForKey:key];
+    }
+    
+    if (image) {
+        if (options & SDImageCacheDecodeFirstFrameOnly) {
+            // Ensure static image
+            if (image.sd_imageFrameCount > 1) {
+#if SD_MAC
+                image = [[NSImage alloc] initWithCGImage:image.CGImage scale:image.scale orientation:kCGImagePropertyOrientationUp];
+#else
+                image = [[UIImage alloc] initWithCGImage:image.CGImage scale:image.scale orientation:image.imageOrientation];
+#endif
+            }
+        } else if (options & SDImageCacheMatchAnimatedImageClass) {
+            // Check image class matching
+            Class animatedImageClass = image.class;
+            Class desiredImageClass = context[SDWebImageContextAnimatedImageClass];
+            if (desiredImageClass && ![animatedImageClass isSubclassOfClass:desiredImageClass]) {
+                image = nil;
+            }
+        }
+    }
+
+    BOOL shouldQueryMemoryOnly = (queryCacheType == SDImageCacheTypeMemory) || (image && !(options & SDImageCacheQueryMemoryData));
+    if (shouldQueryMemoryOnly) {
+        if (doneBlock) {
+            doneBlock(image, nil, SDImageCacheTypeMemory);
+        }
+        return nil;
+    }
+    
+    // Second check the disk cache...
+    SDCallbackQueue *queue = context[SDWebImageContextCallbackQueue];
+    SDImageCacheToken *operation = [[SDImageCacheToken alloc] initWithDoneBlock:doneBlock];
+    operation.key = key;
+    operation.callbackQueue = queue;
+    // Check whether we need to synchronously query disk
+    // 1. in-memory cache hit & memoryDataSync
+    // 2. in-memory cache miss & diskDataSync
+    BOOL shouldQueryDiskSync = ((image && options & SDImageCacheQueryMemoryDataSync) ||
+                                (!image && options & SDImageCacheQueryDiskDataSync));
+    NSData* (^queryDiskDataBlock)(void) = ^NSData* {
+        @synchronized (operation) {
+            if (operation.isCancelled) {
+                return nil;
+            }
+        }
+        
+        return [self diskImageDataBySearchingAllPathsForKey:key];
+    };
+    
+    UIImage* (^queryDiskImageBlock)(NSData*) = ^UIImage*(NSData* diskData) {
+        @synchronized (operation) {
+            if (operation.isCancelled) {
+                return nil;
+            }
+        }
+        
+        UIImage *diskImage;
+        if (image) {
+            // the image is from in-memory cache, but need image data
+            diskImage = image;
+        } else if (diskData) {
+            // the image memory cache miss, need image data and image
+            BOOL shouldCacheToMemory = YES;
+            if (context[SDWebImageContextStoreCacheType]) {
+                SDImageCacheType cacheType = [context[SDWebImageContextStoreCacheType] integerValue];
+                shouldCacheToMemory = (cacheType == SDImageCacheTypeAll || cacheType == SDImageCacheTypeMemory);
+            }
+            // Special case: If user query image in list for the same URL, to avoid decode and write **same** image object into disk cache multiple times, we query and check memory cache here again. See: #3523
+            // This because disk operation can be async, previous sync check of `memory cache miss`, does not gurantee current check of `memory cache miss`
+            if (!shouldQueryDiskSync) {
+                // First check the in-memory cache...
+                if (!shouldQueryDiskOnly) {
+                    diskImage = [self imageFromMemoryCacheForKey:key];
+                }
+            }
+            // decode image data only if in-memory cache missed
+            if (!diskImage) {
+                diskImage = [self diskImageForKey:key data:diskData options:options context:context];
+            }
+        }
+        return diskImage;
+    };
+    
+    // Query in ioQueue to keep IO-safe
+    if (shouldQueryDiskSync) {
+        __block NSData* diskData;
+        __block UIImage* diskImage;
+        dispatch_sync(self.ioQueue, ^{
+            diskData = queryDiskDataBlock();
+            diskImage = queryDiskImageBlock(diskData);
+        });
+        if (doneBlock) {
+            doneBlock(diskImage, diskData, SDImageCacheTypeDisk);
+        }
+    } else {
+        dispatch_async(self.ioQueue, ^{
+            NSData* diskData = queryDiskDataBlock();
+            UIImage* diskImage = queryDiskImageBlock(diskData);
+            @synchronized (operation) {
+                if (operation.isCancelled) {
+                    return;
+                }
+            }
+            if (doneBlock) {
+                [(queue ?: SDCallbackQueue.mainQueue) async:^{
+                    // Dispatch from IO queue to main queue need time, user may call cancel during the dispatch timing
+                    // This check is here to avoid double callback (one is from `SDImageCacheToken` in sync)
+                    @synchronized (operation) {
+                        if (operation.isCancelled) {
+                            return;
+                        }
+                    }
+                    doneBlock(diskImage, diskData, SDImageCacheTypeDisk);
+                }];
+            }
+        });
+    }
+    
+    return operation;
+}
+
+#pragma mark - Remove Ops
+
+- (void)removeImageForKey:(nullable NSString *)key withCompletion:(nullable SDWebImageNoParamsBlock)completion {
+    [self removeImageForKey:key fromDisk:YES withCompletion:completion];
+}
+
+- (void)removeImageForKey:(nullable NSString *)key fromDisk:(BOOL)fromDisk withCompletion:(nullable SDWebImageNoParamsBlock)completion {
+    [self removeImageForKey:key fromMemory:YES fromDisk:fromDisk withCompletion:completion];
+}
+
+- (void)removeImageForKey:(nullable NSString *)key fromMemory:(BOOL)fromMemory fromDisk:(BOOL)fromDisk withCompletion:(nullable SDWebImageNoParamsBlock)completion {
+    if (!key) {
+        return;
+    }
+
+    if (fromMemory && self.config.shouldCacheImagesInMemory) {
+        [self.memoryCache removeObjectForKey:key];
+    }
+
+    if (fromDisk) {
+        dispatch_async(self.ioQueue, ^{
+            [self.diskCache removeDataForKey:key];
+            
+            if (completion) {
+                dispatch_async(dispatch_get_main_queue(), ^{
+                    completion();
+                });
+            }
+        });
+    } else if (completion) {
+        completion();
+    }
+}
+
+- (void)removeImageFromMemoryForKey:(NSString *)key {
+    if (!key) {
+        return;
+    }
+    
+    [self.memoryCache removeObjectForKey:key];
+}
+
+- (void)removeImageFromDiskForKey:(NSString *)key {
+    if (!key) {
+        return;
+    }
+    dispatch_sync(self.ioQueue, ^{
+        [self _removeImageFromDiskForKey:key];
+    });
+}
+
+// Make sure to call from io queue by caller
+- (void)_removeImageFromDiskForKey:(NSString *)key {
+    if (!key) {
+        return;
+    }
+    
+    [self.diskCache removeDataForKey:key];
+}
+
+#pragma mark - Cache clean Ops
+
+- (void)clearMemory {
+    [self.memoryCache removeAllObjects];
+}
+
+- (void)clearDiskOnCompletion:(nullable SDWebImageNoParamsBlock)completion {
+    dispatch_async(self.ioQueue, ^{
+        [self.diskCache removeAllData];
+        if (completion) {
+            dispatch_async(dispatch_get_main_queue(), ^{
+                completion();
+            });
+        }
+    });
+}
+
+- (void)deleteOldFilesWithCompletionBlock:(nullable SDWebImageNoParamsBlock)completionBlock {
+    dispatch_async(self.ioQueue, ^{
+        [self.diskCache removeExpiredData];
+        if (completionBlock) {
+            dispatch_async(dispatch_get_main_queue(), ^{
+                completionBlock();
+            });
+        }
+    });
+}
+
+#pragma mark - UIApplicationWillTerminateNotification
+
+#if SD_UIKIT || SD_MAC
+- (void)applicationWillTerminate:(NSNotification *)notification {
+    // On iOS/macOS, the async opeartion to remove exipred data will be terminated quickly
+    // Try using the sync operation to ensure we reomve the exipred data
+    if (!self.config.shouldRemoveExpiredDataWhenTerminate) {
+        return;
+    }
+    dispatch_sync(self.ioQueue, ^{
+        [self.diskCache removeExpiredData];
+    });
+}
+#endif
+
+#pragma mark - UIApplicationDidEnterBackgroundNotification
+
+#if SD_UIKIT
+- (void)applicationDidEnterBackground:(NSNotification *)notification {
+    if (!self.config.shouldRemoveExpiredDataWhenEnterBackground) {
+        return;
+    }
+    Class UIApplicationClass = NSClassFromString(@"UIApplication");
+    if(!UIApplicationClass || ![UIApplicationClass respondsToSelector:@selector(sharedApplication)]) {
+        return;
+    }
+    UIApplication *application = [UIApplication performSelector:@selector(sharedApplication)];
+    __block UIBackgroundTaskIdentifier bgTask = [application beginBackgroundTaskWithExpirationHandler:^{
+        // Clean up any unfinished task business by marking where you
+        // stopped or ending the task outright.
+        [application endBackgroundTask:bgTask];
+        bgTask = UIBackgroundTaskInvalid;
+    }];
+
+    // Start the long-running task and return immediately.
+    [self deleteOldFilesWithCompletionBlock:^{
+        [application endBackgroundTask:bgTask];
+        bgTask = UIBackgroundTaskInvalid;
+    }];
+}
+#endif
+
+#pragma mark - Cache Info
+
+- (NSUInteger)totalDiskSize {
+    __block NSUInteger size = 0;
+    dispatch_sync(self.ioQueue, ^{
+        size = [self.diskCache totalSize];
+    });
+    return size;
+}
+
+- (NSUInteger)totalDiskCount {
+    __block NSUInteger count = 0;
+    dispatch_sync(self.ioQueue, ^{
+        count = [self.diskCache totalCount];
+    });
+    return count;
+}
+
+- (void)calculateSizeWithCompletionBlock:(nullable SDImageCacheCalculateSizeBlock)completionBlock {
+    dispatch_async(self.ioQueue, ^{
+        NSUInteger fileCount = [self.diskCache totalCount];
+        NSUInteger totalSize = [self.diskCache totalSize];
+        if (completionBlock) {
+            dispatch_async(dispatch_get_main_queue(), ^{
+                completionBlock(fileCount, totalSize);
+            });
+        }
+    });
+}
+
+#pragma mark - Helper
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
++ (SDWebImageOptions)imageOptionsFromCacheOptions:(SDImageCacheOptions)cacheOptions {
+    SDWebImageOptions options = 0;
+    if (cacheOptions & SDImageCacheScaleDownLargeImages) options |= SDWebImageScaleDownLargeImages;
+    if (cacheOptions & SDImageCacheDecodeFirstFrameOnly) options |= SDWebImageDecodeFirstFrameOnly;
+    if (cacheOptions & SDImageCachePreloadAllFrames) options |= SDWebImagePreloadAllFrames;
+    if (cacheOptions & SDImageCacheAvoidDecodeImage) options |= SDWebImageAvoidDecodeImage;
+    if (cacheOptions & SDImageCacheMatchAnimatedImageClass) options |= SDWebImageMatchAnimatedImageClass;
+    
+    return options;
+}
+#pragma clang diagnostic pop
+
+@end
+
+@implementation SDImageCache (SDImageCache)
+
+#pragma mark - SDImageCache
+
+- (id<SDWebImageOperation>)queryImageForKey:(NSString *)key options:(SDWebImageOptions)options context:(nullable SDWebImageContext *)context completion:(nullable SDImageCacheQueryCompletionBlock)completionBlock {
+    return [self queryImageForKey:key options:options context:context cacheType:SDImageCacheTypeAll completion:completionBlock];
+}
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+- (id<SDWebImageOperation>)queryImageForKey:(NSString *)key options:(SDWebImageOptions)options context:(nullable SDWebImageContext *)context cacheType:(SDImageCacheType)cacheType completion:(nullable SDImageCacheQueryCompletionBlock)completionBlock {
+    SDImageCacheOptions cacheOptions = 0;
+    if (options & SDWebImageQueryMemoryData) cacheOptions |= SDImageCacheQueryMemoryData;
+    if (options & SDWebImageQueryMemoryDataSync) cacheOptions |= SDImageCacheQueryMemoryDataSync;
+    if (options & SDWebImageQueryDiskDataSync) cacheOptions |= SDImageCacheQueryDiskDataSync;
+    if (options & SDWebImageScaleDownLargeImages) cacheOptions |= SDImageCacheScaleDownLargeImages;
+    if (options & SDWebImageAvoidDecodeImage) cacheOptions |= SDImageCacheAvoidDecodeImage;
+    if (options & SDWebImageDecodeFirstFrameOnly) cacheOptions |= SDImageCacheDecodeFirstFrameOnly;
+    if (options & SDWebImagePreloadAllFrames) cacheOptions |= SDImageCachePreloadAllFrames;
+    if (options & SDWebImageMatchAnimatedImageClass) cacheOptions |= SDImageCacheMatchAnimatedImageClass;
+    
+    return [self queryCacheOperationForKey:key options:cacheOptions context:context cacheType:cacheType done:completionBlock];
+}
+#pragma clang diagnostic pop
+
+- (void)storeImage:(UIImage *)image imageData:(NSData *)imageData forKey:(nullable NSString *)key cacheType:(SDImageCacheType)cacheType completion:(nullable SDWebImageNoParamsBlock)completionBlock {
+    [self storeImage:image imageData:imageData forKey:key options:0 context:nil cacheType:cacheType completion:completionBlock];
+}
+
+- (void)removeImageForKey:(NSString *)key cacheType:(SDImageCacheType)cacheType completion:(nullable SDWebImageNoParamsBlock)completionBlock {
+    switch (cacheType) {
+        case SDImageCacheTypeNone: {
+            [self removeImageForKey:key fromMemory:NO fromDisk:NO withCompletion:completionBlock];
+        }
+            break;
+        case SDImageCacheTypeMemory: {
+            [self removeImageForKey:key fromMemory:YES fromDisk:NO withCompletion:completionBlock];
+        }
+            break;
+        case SDImageCacheTypeDisk: {
+            [self removeImageForKey:key fromMemory:NO fromDisk:YES withCompletion:completionBlock];
+        }
+            break;
+        case SDImageCacheTypeAll: {
+            [self removeImageForKey:key fromMemory:YES fromDisk:YES withCompletion:completionBlock];
+        }
+            break;
+        default: {
+            if (completionBlock) {
+                completionBlock();
+            }
+        }
+            break;
+    }
+}
+
+- (void)containsImageForKey:(NSString *)key cacheType:(SDImageCacheType)cacheType completion:(nullable SDImageCacheContainsCompletionBlock)completionBlock {
+    switch (cacheType) {
+        case SDImageCacheTypeNone: {
+            if (completionBlock) {
+                completionBlock(SDImageCacheTypeNone);
+            }
+        }
+            break;
+        case SDImageCacheTypeMemory: {
+            BOOL isInMemoryCache = ([self imageFromMemoryCacheForKey:key] != nil);
+            if (completionBlock) {
+                completionBlock(isInMemoryCache ? SDImageCacheTypeMemory : SDImageCacheTypeNone);
+            }
+        }
+            break;
+        case SDImageCacheTypeDisk: {
+            [self diskImageExistsWithKey:key completion:^(BOOL isInDiskCache) {
+                if (completionBlock) {
+                    completionBlock(isInDiskCache ? SDImageCacheTypeDisk : SDImageCacheTypeNone);
+                }
+            }];
+        }
+            break;
+        case SDImageCacheTypeAll: {
+            BOOL isInMemoryCache = ([self imageFromMemoryCacheForKey:key] != nil);
+            if (isInMemoryCache) {
+                if (completionBlock) {
+                    completionBlock(SDImageCacheTypeMemory);
+                }
+                return;
+            }
+            [self diskImageExistsWithKey:key completion:^(BOOL isInDiskCache) {
+                if (completionBlock) {
+                    completionBlock(isInDiskCache ? SDImageCacheTypeDisk : SDImageCacheTypeNone);
+                }
+            }];
+        }
+            break;
+        default:
+            if (completionBlock) {
+                completionBlock(SDImageCacheTypeNone);
+            }
+            break;
+    }
+}
+
+- (void)clearWithCacheType:(SDImageCacheType)cacheType completion:(SDWebImageNoParamsBlock)completionBlock {
+    switch (cacheType) {
+        case SDImageCacheTypeNone: {
+            if (completionBlock) {
+                completionBlock();
+            }
+        }
+            break;
+        case SDImageCacheTypeMemory: {
+            [self clearMemory];
+            if (completionBlock) {
+                completionBlock();
+            }
+        }
+            break;
+        case SDImageCacheTypeDisk: {
+            [self clearDiskOnCompletion:completionBlock];
+        }
+            break;
+        case SDImageCacheTypeAll: {
+            [self clearMemory];
+            [self clearDiskOnCompletion:completionBlock];
+        }
+            break;
+        default: {
+            if (completionBlock) {
+                completionBlock();
+            }
+        }
+            break;
+    }
+}
+
+@end
+
diff --git a/SDWebImage/Core/SDImageCacheConfig.h b/SDWebImage/Core/SDImageCacheConfig.h
new file mode 100644
index 000000000..dace4beba
--- /dev/null
+++ b/SDWebImage/Core/SDImageCacheConfig.h
@@ -0,0 +1,153 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCompat.h"
+
+/// Image Cache Expire Type
+typedef NS_ENUM(NSUInteger, SDImageCacheConfigExpireType) {
+    /**
+     * When the image cache is accessed it will update this value
+     */
+    SDImageCacheConfigExpireTypeAccessDate,
+    /**
+     * When the image cache is created or modified it will update this value (Default)
+     */
+    SDImageCacheConfigExpireTypeModificationDate,
+    /**
+     * When the image cache is created it will update this value
+     */
+    SDImageCacheConfigExpireTypeCreationDate,
+    /**
+     * When the image cache is created, modified, renamed, file attribute updated (like permission, xattr)  it will update this value
+     */
+    SDImageCacheConfigExpireTypeChangeDate,
+};
+
+/**
+ The class contains all the config for image cache
+ @note This class conform to NSCopying, make sure to add the property in `copyWithZone:` as well.
+ */
+@interface SDImageCacheConfig : NSObject <NSCopying>
+
+/**
+ Gets the default cache config used for shared instance or initialization when it does not provide any cache config. Such as `SDImageCache.sharedImageCache`.
+ @note You can modify the property on default cache config, which can be used for later created cache instance. The already created cache instance does not get affected.
+ */
+@property (nonatomic, class, readonly, nonnull) SDImageCacheConfig *defaultCacheConfig;
+
+/**
+ * Whether or not to disable iCloud backup
+ * Defaults to YES.
+ */
+@property (assign, nonatomic) BOOL shouldDisableiCloud;
+
+/**
+ * Whether or not to use memory cache
+ * @note When the memory cache is disabled, the weak memory cache will also be disabled.
+ * Defaults to YES.
+ */
+@property (assign, nonatomic) BOOL shouldCacheImagesInMemory;
+
+/*
+ * The option to control weak memory cache for images. When enable, `SDImageCache`'s memory cache will use a weak maptable to store the image at the same time when it stored to memory, and get removed at the same time.
+ * However when memory warning is triggered, since the weak maptable does not hold a strong reference to image instance, even when the memory cache itself is purged, some images which are held strongly by UIImageViews or other live instances can be recovered again, to avoid later re-query from disk cache or network. This may be helpful for the case, for example, when app enter background and memory is purged, cause cell flashing after re-enter foreground.
+ * When enabling this option, we will sync back the image from weak maptable to strong cache during next time top level `sd_setImage` function call.
+ * Defaults to NO (YES before 5.12.0 version). You can change this option dynamically.
+ */
+@property (assign, nonatomic) BOOL shouldUseWeakMemoryCache;
+
+/**
+ * Whether or not to remove the expired disk data when application entering the background. (Not works for macOS)
+ * Defaults to YES.
+ */
+@property (assign, nonatomic) BOOL shouldRemoveExpiredDataWhenEnterBackground;
+
+/**
+ * Whether or not to remove the expired disk data when application been terminated. This operation is processed in sync to ensure clean up.
+ * Defaults to YES.
+ */
+@property (assign, nonatomic) BOOL shouldRemoveExpiredDataWhenTerminate;
+
+/**
+ * The reading options while reading cache from disk.
+ * Defaults to 0. You can set this to `NSDataReadingMappedIfSafe` to improve performance.
+ */
+@property (assign, nonatomic) NSDataReadingOptions diskCacheReadingOptions;
+
+/**
+ * The writing options while writing cache to disk.
+ * Defaults to `NSDataWritingAtomic`. You can set this to `NSDataWritingWithoutOverwriting` to prevent overwriting an existing file.
+ */
+@property (assign, nonatomic) NSDataWritingOptions diskCacheWritingOptions;
+
+/**
+ * The maximum length of time to keep an image in the disk cache, in seconds.
+ * Setting this to a negative value means no expiring.
+ * Setting this to zero means that all cached files would be removed when do expiration check.
+ * Defaults to 1 week.
+ */
+@property (assign, nonatomic) NSTimeInterval maxDiskAge;
+
+/**
+ * The maximum size of the disk cache, in bytes.
+ * Defaults to 0. Which means there is no cache size limit.
+ */
+@property (assign, nonatomic) NSUInteger maxDiskSize;
+
+/**
+ * The maximum "total cost" of the in-memory image cache. The cost function is the bytes size held in memory.
+ * @note The memory cost is bytes size in memory, but not simple pixels count. For common ARGB8888 image, one pixel is 4 bytes (32 bits).
+ * Defaults to 0. Which means there is no memory cost limit.
+ */
+@property (assign, nonatomic) NSUInteger maxMemoryCost;
+
+/**
+ * The maximum number of objects in-memory image cache should hold.
+ * Defaults to 0. Which means there is no memory count limit.
+ */
+@property (assign, nonatomic) NSUInteger maxMemoryCount;
+
+/*
+ * The attribute which the clear cache will be checked against when clearing the disk cache
+ * Default is Access Date
+ */
+@property (assign, nonatomic) SDImageCacheConfigExpireType diskCacheExpireType;
+
+/**
+ * The custom file manager for disk cache. Pass nil to let disk cache choose the proper file manager.
+ * Defaults to nil.
+ * @note This value does not support dynamic changes. Which means further modification on this value after cache initialized has no effect.
+ * @note Since `NSFileManager` does not support `NSCopying`. We just pass this by reference during copying. So it's not recommend to set this value on `defaultCacheConfig`.
+ */
+@property (strong, nonatomic, nullable) NSFileManager *fileManager;
+
+/**
+ * The dispatch queue attr for ioQueue. You can config the QoS and concurrent/serial to internal IO queue. The ioQueue is used by SDImageCache to access read/write for disk data.
+ * Defaults we use `DISPATCH_QUEUE_SERIAL`(NULL) under iOS 10, `DISPATCH_QUEUE_SERIAL_WITH_AUTORELEASE_POOL` above and equal iOS 10, using serial dispatch queue is to ensure single access for disk data. It's safe but may be slow.
+ * @note You can override this to use `DISPATCH_QUEUE_CONCURRENT`, use concurrent queue.
+ * @warning **MAKE SURE** to keep `diskCacheWritingOptions` to use `NSDataWritingAtomic`, or concurrent queue may cause corrupted disk data (because multiple threads read/write same file without atomic is not IO-safe).
+ * @note This value does not support dynamic changes. Which means further modification on this value after cache initialized has no effect.
+ */
+@property (strong, nonatomic, nullable) dispatch_queue_attr_t ioQueueAttributes;
+
+/**
+ * The custom memory cache class. Provided class instance must conform to `SDMemoryCache` protocol to allow usage.
+ * Defaults to built-in `SDMemoryCache` class.
+ * @note This value does not support dynamic changes. Which means further modification on this value after cache initialized has no effect.
+ */
+@property (assign, nonatomic, nonnull) Class memoryCacheClass;
+
+/**
+ * The custom disk cache class. Provided class instance must conform to `SDDiskCache` protocol to allow usage.
+ * Defaults to built-in `SDDiskCache` class.
+ * @note This value does not support dynamic changes. Which means further modification on this value after cache initialized has no effect.
+ */
+@property (assign ,nonatomic, nonnull) Class diskCacheClass;
+
+@end
diff --git a/SDWebImage/Core/SDImageCacheConfig.m b/SDWebImage/Core/SDImageCacheConfig.m
new file mode 100644
index 000000000..70402dbb2
--- /dev/null
+++ b/SDWebImage/Core/SDImageCacheConfig.m
@@ -0,0 +1,72 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDImageCacheConfig.h"
+#import "SDMemoryCache.h"
+#import "SDDiskCache.h"
+
+static SDImageCacheConfig *_defaultCacheConfig;
+static const NSInteger kDefaultCacheMaxDiskAge = 60 * 60 * 24 * 7; // 1 week
+
+@implementation SDImageCacheConfig
+
++ (SDImageCacheConfig *)defaultCacheConfig {
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        _defaultCacheConfig = [SDImageCacheConfig new];
+    });
+    return _defaultCacheConfig;
+}
+
+- (instancetype)init {
+    if (self = [super init]) {
+        _shouldDisableiCloud = YES;
+        _shouldCacheImagesInMemory = YES;
+        _shouldUseWeakMemoryCache = NO;
+        _shouldRemoveExpiredDataWhenEnterBackground = YES;
+        _shouldRemoveExpiredDataWhenTerminate = YES;
+        _diskCacheReadingOptions = 0;
+        _diskCacheWritingOptions = NSDataWritingAtomic;
+        _maxDiskAge = kDefaultCacheMaxDiskAge;
+        _maxDiskSize = 0;
+        _diskCacheExpireType = SDImageCacheConfigExpireTypeAccessDate;
+        _fileManager = nil;
+        if (@available(iOS 10.0, tvOS 10.0, macOS 10.12, watchOS 3.0, *)) {
+            _ioQueueAttributes = DISPATCH_QUEUE_SERIAL_WITH_AUTORELEASE_POOL; // DISPATCH_AUTORELEASE_FREQUENCY_WORK_ITEM
+        } else {
+            _ioQueueAttributes = DISPATCH_QUEUE_SERIAL; // NULL
+        }
+        _memoryCacheClass = [SDMemoryCache class];
+        _diskCacheClass = [SDDiskCache class];
+    }
+    return self;
+}
+
+- (id)copyWithZone:(NSZone *)zone {
+    SDImageCacheConfig *config = [[[self class] allocWithZone:zone] init];
+    config.shouldDisableiCloud = self.shouldDisableiCloud;
+    config.shouldCacheImagesInMemory = self.shouldCacheImagesInMemory;
+    config.shouldUseWeakMemoryCache = self.shouldUseWeakMemoryCache;
+    config.shouldRemoveExpiredDataWhenEnterBackground = self.shouldRemoveExpiredDataWhenEnterBackground;
+    config.shouldRemoveExpiredDataWhenTerminate = self.shouldRemoveExpiredDataWhenTerminate;
+    config.diskCacheReadingOptions = self.diskCacheReadingOptions;
+    config.diskCacheWritingOptions = self.diskCacheWritingOptions;
+    config.maxDiskAge = self.maxDiskAge;
+    config.maxDiskSize = self.maxDiskSize;
+    config.maxMemoryCost = self.maxMemoryCost;
+    config.maxMemoryCount = self.maxMemoryCount;
+    config.diskCacheExpireType = self.diskCacheExpireType;
+    config.fileManager = self.fileManager; // NSFileManager does not conform to NSCopying, just pass the reference
+    config.ioQueueAttributes = self.ioQueueAttributes; // Pass the reference
+    config.memoryCacheClass = self.memoryCacheClass;
+    config.diskCacheClass = self.diskCacheClass;
+    
+    return config;
+}
+
+@end
diff --git a/SDWebImage/Core/SDImageCacheDefine.h b/SDWebImage/Core/SDImageCacheDefine.h
new file mode 100644
index 000000000..b33badaff
--- /dev/null
+++ b/SDWebImage/Core/SDImageCacheDefine.h
@@ -0,0 +1,179 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCompat.h"
+#import "SDWebImageOperation.h"
+#import "SDWebImageDefine.h"
+#import "SDImageCoder.h"
+
+/// Image Cache Type
+typedef NS_ENUM(NSInteger, SDImageCacheType) {
+    /**
+     * For query and contains op in response, means the image isn't available in the image cache
+     * For op in request, this type is not available and take no effect.
+     */
+    SDImageCacheTypeNone,
+    /**
+     * For query and contains op in response, means the image was obtained from the disk cache.
+     * For op in request, means process only disk cache.
+     */
+    SDImageCacheTypeDisk,
+    /**
+     * For query and contains op in response, means the image was obtained from the memory cache.
+     * For op in request, means process only memory cache.
+     */
+    SDImageCacheTypeMemory,
+    /**
+     * For query and contains op in response, this type is not available and take no effect.
+     * For op in request, means process both memory cache and disk cache.
+     */
+    SDImageCacheTypeAll
+};
+
+typedef void(^SDImageCacheCheckCompletionBlock)(BOOL isInCache);
+typedef void(^SDImageCacheQueryDataCompletionBlock)(NSData * _Nullable data);
+typedef void(^SDImageCacheCalculateSizeBlock)(NSUInteger fileCount, NSUInteger totalSize);
+typedef NSString * _Nullable (^SDImageCacheAdditionalCachePathBlock)(NSString * _Nonnull key);
+typedef void(^SDImageCacheQueryCompletionBlock)(UIImage * _Nullable image, NSData * _Nullable data, SDImageCacheType cacheType);
+typedef void(^SDImageCacheContainsCompletionBlock)(SDImageCacheType containsCacheType);
+
+/**
+ This is the built-in decoding process for image query from cache.
+ @note If you want to implement your custom loader with `queryImageForKey:options:context:completion:` API, but also want to keep compatible with SDWebImage's behavior, you'd better use this to produce image.
+ 
+ @param imageData The image data from the cache. Should not be nil
+ @param cacheKey The image cache key from the input. Should not be nil
+ @param options The options arg from the input
+ @param context The context arg from the input
+ @return The decoded image for current image data query from cache
+ */
+FOUNDATION_EXPORT UIImage * _Nullable SDImageCacheDecodeImageData(NSData * _Nonnull imageData, NSString * _Nonnull cacheKey, SDWebImageOptions options, SDWebImageContext * _Nullable context);
+
+/// Get the decode options from the loading context options and cache key. This is the built-in translate between the web loading part to the decoding part (which does not depends on).
+/// @param context The context arg from the input
+/// @param options The options arg from the input
+/// @param cacheKey The image cache key from the input. Should not be nil
+FOUNDATION_EXPORT SDImageCoderOptions * _Nonnull SDGetDecodeOptionsFromContext(SDWebImageContext * _Nullable context, SDWebImageOptions options, NSString * _Nonnull cacheKey);
+
+/// Set the decode options to the loading context options. This is the built-in translate between the web loading part from the decoding part (which does not depends on).
+/// @param mutableContext The context arg to override
+/// @param mutableOptions The options arg to override
+/// @param decodeOptions The image decoding options
+FOUNDATION_EXPORT void SDSetDecodeOptionsToContext(SDWebImageMutableContext * _Nonnull mutableContext, SDWebImageOptions * _Nonnull mutableOptions, SDImageCoderOptions * _Nonnull decodeOptions);
+
+/**
+ This is the image cache protocol to provide custom image cache for `SDWebImageManager`.
+ Though the best practice to custom image cache, is to write your own class which conform `SDMemoryCache` or `SDDiskCache` protocol for `SDImageCache` class (See more on `SDImageCacheConfig.memoryCacheClass & SDImageCacheConfig.diskCacheClass`).
+ However, if your own cache implementation contains more advanced feature beyond `SDImageCache` itself, you can consider to provide this instead. For example, you can even use a cache manager like `SDImageCachesManager` to register multiple caches.
+ */
+@protocol SDImageCache <NSObject>
+
+@required
+/**
+ Query the cached image from image cache for given key. The operation can be used to cancel the query.
+ If image is cached in memory, completion is called synchronously, else asynchronously and depends on the options arg (See `SDWebImageQueryDiskSync`)
+
+ @param key The image cache key
+ @param options A mask to specify options to use for this query
+ @param context A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold. Pass `.callbackQueue` to control callback queue
+ @param completionBlock The completion block. Will not get called if the operation is cancelled
+ @return The operation for this query
+ */
+- (nullable id<SDWebImageOperation>)queryImageForKey:(nullable NSString *)key
+                                             options:(SDWebImageOptions)options
+                                             context:(nullable SDWebImageContext *)context
+                                          completion:(nullable SDImageCacheQueryCompletionBlock)completionBlock API_DEPRECATED_WITH_REPLACEMENT("queryImageForKey:options:context:cacheType:completion:", macos(10.10, API_TO_BE_DEPRECATED), ios(8.0, API_TO_BE_DEPRECATED), tvos(9.0, API_TO_BE_DEPRECATED), watchos(2.0, API_TO_BE_DEPRECATED));
+
+@optional
+/**
+ Query the cached image from image cache for given key. The operation can be used to cancel the query.
+ If image is cached in memory, completion is called synchronously, else asynchronously and depends on the options arg (See `SDWebImageQueryDiskSync`)
+
+ @param key The image cache key
+ @param options A mask to specify options to use for this query
+ @param context A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold. Pass `.callbackQueue` to control callback queue
+ @param cacheType Specify where to query the cache from. By default we use `.all`, which means both memory cache and disk cache. You can choose to query memory only or disk only as well. Pass `.none` is invalid and callback with nil immediately.
+ @param completionBlock The completion block. Will not get called if the operation is cancelled
+ @return The operation for this query
+ */
+- (nullable id<SDWebImageOperation>)queryImageForKey:(nullable NSString *)key
+                                             options:(SDWebImageOptions)options
+                                             context:(nullable SDWebImageContext *)context
+                                           cacheType:(SDImageCacheType)cacheType
+                                          completion:(nullable SDImageCacheQueryCompletionBlock)completionBlock;
+
+@required
+/**
+ Store the image into image cache for the given key. If cache type is memory only, completion is called synchronously, else asynchronously.
+
+ @param image The image to store
+ @param imageData The image data to be used for disk storage
+ @param key The image cache key
+ @param cacheType The image store op cache type
+ @param completionBlock A block executed after the operation is finished
+ */
+- (void)storeImage:(nullable UIImage *)image
+         imageData:(nullable NSData *)imageData
+            forKey:(nullable NSString *)key
+         cacheType:(SDImageCacheType)cacheType
+        completion:(nullable SDWebImageNoParamsBlock)completionBlock API_DEPRECATED_WITH_REPLACEMENT("storeImage:imageData:forKey:options:context:cacheType:completion:", macos(10.10, API_TO_BE_DEPRECATED), ios(8.0, API_TO_BE_DEPRECATED), tvos(9.0, API_TO_BE_DEPRECATED), watchos(2.0, API_TO_BE_DEPRECATED));
+
+@optional
+/**
+ Store the image into image cache for the given key. If cache type is memory only, completion is called synchronously, else asynchronously.
+
+ @param image The image to store
+ @param imageData The image data to be used for disk storage
+ @param key The image cache key
+ @param options A mask to specify options to use for this store
+ @param context The context options to use. Pass `.callbackQueue` to control callback queue
+ @param cacheType The image store op cache type
+ @param completionBlock A block executed after the operation is finished
+ */
+- (void)storeImage:(nullable UIImage *)image
+         imageData:(nullable NSData *)imageData
+            forKey:(nullable NSString *)key
+           options:(SDWebImageOptions)options
+           context:(nullable SDWebImageContext *)context
+         cacheType:(SDImageCacheType)cacheType
+        completion:(nullable SDWebImageNoParamsBlock)completionBlock;
+
+#pragma mark - Deprecated because SDWebImageManager does not use these APIs
+/**
+ Remove the image from image cache for the given key. If cache type is memory only, completion is called synchronously, else asynchronously.
+
+ @param key The image cache key
+ @param cacheType The image remove op cache type
+ @param completionBlock A block executed after the operation is finished
+ */
+- (void)removeImageForKey:(nullable NSString *)key
+                cacheType:(SDImageCacheType)cacheType
+               completion:(nullable SDWebImageNoParamsBlock)completionBlock API_DEPRECATED("No longer use. Cast to cache instance and call its API", macos(10.10, API_TO_BE_DEPRECATED), ios(8.0, API_TO_BE_DEPRECATED), tvos(9.0, API_TO_BE_DEPRECATED), watchos(2.0, API_TO_BE_DEPRECATED));
+
+/**
+ Check if image cache contains the image for the given key (does not load the image). If image is cached in memory, completion is called synchronously, else asynchronously.
+
+ @param key The image cache key
+ @param cacheType The image contains op cache type
+ @param completionBlock A block executed after the operation is finished.
+ */
+- (void)containsImageForKey:(nullable NSString *)key
+                  cacheType:(SDImageCacheType)cacheType
+                 completion:(nullable SDImageCacheContainsCompletionBlock)completionBlock API_DEPRECATED("No longer use. Cast to cache instance and call its API", macos(10.10, API_TO_BE_DEPRECATED), ios(8.0, API_TO_BE_DEPRECATED), tvos(9.0, API_TO_BE_DEPRECATED), watchos(2.0, API_TO_BE_DEPRECATED));
+
+/**
+ Clear all the cached images for image cache. If cache type is memory only, completion is called synchronously, else asynchronously.
+
+ @param cacheType The image clear op cache type
+ @param completionBlock A block executed after the operation is finished
+ */
+- (void)clearWithCacheType:(SDImageCacheType)cacheType
+                completion:(nullable SDWebImageNoParamsBlock)completionBlock API_DEPRECATED("No longer use. Cast to cache instance and call its API", macos(10.10, API_TO_BE_DEPRECATED), ios(8.0, API_TO_BE_DEPRECATED), tvos(9.0, API_TO_BE_DEPRECATED), watchos(2.0, API_TO_BE_DEPRECATED));
+
+@end
diff --git a/SDWebImage/Core/SDImageCacheDefine.m b/SDWebImage/Core/SDImageCacheDefine.m
new file mode 100644
index 000000000..4e4ad32ae
--- /dev/null
+++ b/SDWebImage/Core/SDImageCacheDefine.m
@@ -0,0 +1,153 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDImageCacheDefine.h"
+#import "SDImageCodersManager.h"
+#import "SDImageCoderHelper.h"
+#import "SDAnimatedImage.h"
+#import "UIImage+Metadata.h"
+#import "SDInternalMacros.h"
+#import "SDDeviceHelper.h"
+
+#import <CoreServices/CoreServices.h>
+
+SDImageCoderOptions * _Nonnull SDGetDecodeOptionsFromContext(SDWebImageContext * _Nullable context, SDWebImageOptions options, NSString * _Nonnull cacheKey) {
+    BOOL decodeFirstFrame = SD_OPTIONS_CONTAINS(options, SDWebImageDecodeFirstFrameOnly);
+    NSNumber *scaleValue = context[SDWebImageContextImageScaleFactor];
+    CGFloat scale = scaleValue.doubleValue >= 1 ? scaleValue.doubleValue : SDImageScaleFactorForKey(cacheKey); // Use cache key to detect scale
+    NSNumber *preserveAspectRatioValue = context[SDWebImageContextImagePreserveAspectRatio];
+    NSValue *thumbnailSizeValue;
+    BOOL shouldScaleDown = SD_OPTIONS_CONTAINS(options, SDWebImageScaleDownLargeImages);
+    NSNumber *scaleDownLimitBytesValue = context[SDWebImageContextImageScaleDownLimitBytes];
+    if (scaleDownLimitBytesValue == nil && shouldScaleDown) {
+        // Use the default limit bytes
+        scaleDownLimitBytesValue = @(SDImageCoderHelper.defaultScaleDownLimitBytes);
+    }
+    if (context[SDWebImageContextImageThumbnailPixelSize]) {
+        thumbnailSizeValue = context[SDWebImageContextImageThumbnailPixelSize];
+    }
+    NSString *typeIdentifierHint = context[SDWebImageContextImageTypeIdentifierHint];
+    NSString *fileExtensionHint;
+    if (!typeIdentifierHint) {
+        // UTI has high priority
+        fileExtensionHint = cacheKey.pathExtension; // without dot
+        if (fileExtensionHint.length == 0) {
+            // Ignore file extension which is empty
+            fileExtensionHint = nil;
+        }
+    }
+    
+    // First check if user provided decode options
+    SDImageCoderMutableOptions *mutableCoderOptions;
+    if (context[SDWebImageContextImageDecodeOptions] != nil) {
+        mutableCoderOptions = [NSMutableDictionary dictionaryWithDictionary:context[SDWebImageContextImageDecodeOptions]];
+    } else {
+        mutableCoderOptions = [NSMutableDictionary dictionaryWithCapacity:6];
+    }
+    
+    // Some options need preserve the custom decode options
+    NSNumber *decodeToHDR = context[SDWebImageContextImageDecodeToHDR];
+    if (decodeToHDR == nil) {
+        decodeToHDR = mutableCoderOptions[SDImageCoderDecodeToHDR];
+    }
+    
+    // Override individual options
+    mutableCoderOptions[SDImageCoderDecodeFirstFrameOnly] = @(decodeFirstFrame);
+    mutableCoderOptions[SDImageCoderDecodeScaleFactor] = @(scale);
+    mutableCoderOptions[SDImageCoderDecodePreserveAspectRatio] = preserveAspectRatioValue;
+    mutableCoderOptions[SDImageCoderDecodeThumbnailPixelSize] = thumbnailSizeValue;
+    mutableCoderOptions[SDImageCoderDecodeTypeIdentifierHint] = typeIdentifierHint;
+    mutableCoderOptions[SDImageCoderDecodeFileExtensionHint] = fileExtensionHint;
+    mutableCoderOptions[SDImageCoderDecodeScaleDownLimitBytes] = scaleDownLimitBytesValue;
+    mutableCoderOptions[SDImageCoderDecodeToHDR] = decodeToHDR;
+    
+    return [mutableCoderOptions copy];
+}
+
+void SDSetDecodeOptionsToContext(SDWebImageMutableContext * _Nonnull mutableContext, SDWebImageOptions * _Nonnull mutableOptions, SDImageCoderOptions * _Nonnull decodeOptions) {
+    if ([decodeOptions[SDImageCoderDecodeFirstFrameOnly] boolValue]) {
+        *mutableOptions |= SDWebImageDecodeFirstFrameOnly;
+    } else {
+        *mutableOptions &= ~SDWebImageDecodeFirstFrameOnly;
+    }
+    
+    mutableContext[SDWebImageContextImageScaleFactor] = decodeOptions[SDImageCoderDecodeScaleFactor];
+    mutableContext[SDWebImageContextImagePreserveAspectRatio] = decodeOptions[SDImageCoderDecodePreserveAspectRatio];
+    mutableContext[SDWebImageContextImageThumbnailPixelSize] = decodeOptions[SDImageCoderDecodeThumbnailPixelSize];
+    mutableContext[SDWebImageContextImageScaleDownLimitBytes] = decodeOptions[SDImageCoderDecodeScaleDownLimitBytes];
+    mutableContext[SDWebImageContextImageDecodeToHDR] = decodeOptions[SDImageCoderDecodeToHDR];
+    
+    NSString *typeIdentifierHint = decodeOptions[SDImageCoderDecodeTypeIdentifierHint];
+    if (!typeIdentifierHint) {
+        NSString *fileExtensionHint = decodeOptions[SDImageCoderDecodeFileExtensionHint];
+        if (fileExtensionHint) {
+            typeIdentifierHint = (__bridge_transfer NSString *)UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, (__bridge CFStringRef)fileExtensionHint, kUTTypeImage);
+            // Ignore dynamic UTI
+            if (UTTypeIsDynamic((__bridge CFStringRef)typeIdentifierHint)) {
+                typeIdentifierHint = nil;
+            }
+        }
+    }
+    mutableContext[SDWebImageContextImageTypeIdentifierHint] = typeIdentifierHint;
+}
+
+UIImage * _Nullable SDImageCacheDecodeImageData(NSData * _Nonnull imageData, NSString * _Nonnull cacheKey, SDWebImageOptions options, SDWebImageContext * _Nullable context) {
+    NSCParameterAssert(imageData);
+    NSCParameterAssert(cacheKey);
+    UIImage *image;
+    SDImageCoderOptions *coderOptions = SDGetDecodeOptionsFromContext(context, options, cacheKey);
+    BOOL decodeFirstFrame = SD_OPTIONS_CONTAINS(options, SDWebImageDecodeFirstFrameOnly);
+    CGFloat scale = [coderOptions[SDImageCoderDecodeScaleFactor] doubleValue];
+    
+    // Grab the image coder
+    id<SDImageCoder> imageCoder = context[SDWebImageContextImageCoder];
+    if (!imageCoder) {
+        imageCoder = [SDImageCodersManager sharedManager];
+    }
+    
+    if (!decodeFirstFrame) {
+        Class animatedImageClass = context[SDWebImageContextAnimatedImageClass];
+        // check whether we should use `SDAnimatedImage`
+        if ([animatedImageClass isSubclassOfClass:[UIImage class]] && [animatedImageClass conformsToProtocol:@protocol(SDAnimatedImage)]) {
+            image = [[animatedImageClass alloc] initWithData:imageData scale:scale options:coderOptions];
+            if (image) {
+                // Preload frames if supported
+                if (options & SDWebImagePreloadAllFrames && [image respondsToSelector:@selector(preloadAllFrames)]) {
+                    [((id<SDAnimatedImage>)image) preloadAllFrames];
+                }
+            } else {
+                // Check image class matching
+                if (options & SDWebImageMatchAnimatedImageClass) {
+                    return nil;
+                }
+            }
+        }
+    }
+    if (!image) {
+        image = [imageCoder decodedImageWithData:imageData options:coderOptions];
+    }
+    if (image) {
+        SDImageForceDecodePolicy policy = SDImageForceDecodePolicyAutomatic;
+        NSNumber *policyValue = context[SDWebImageContextImageForceDecodePolicy];
+        if (policyValue != nil) {
+            policy = policyValue.unsignedIntegerValue;
+        }
+        // TODO: Deprecated, remove in SD 6.0...
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+        if (SD_OPTIONS_CONTAINS(options, SDWebImageAvoidDecodeImage)) {
+            policy = SDImageForceDecodePolicyNever;
+        }
+#pragma clang diagnostic pop
+        image = [SDImageCoderHelper decodedImageWithImage:image policy:policy];
+        // assign the decode options, to let manager check whether to re-decode if needed
+        image.sd_decodeOptions = coderOptions;
+    }
+    
+    return image;
+}
diff --git a/SDWebImage/Core/SDImageCachesManager.h b/SDWebImage/Core/SDImageCachesManager.h
new file mode 100644
index 000000000..ad85db882
--- /dev/null
+++ b/SDWebImage/Core/SDImageCachesManager.h
@@ -0,0 +1,81 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDImageCacheDefine.h"
+
+/// Policy for cache operation
+typedef NS_ENUM(NSUInteger, SDImageCachesManagerOperationPolicy) {
+    SDImageCachesManagerOperationPolicySerial, // process all caches serially (from the highest priority to the lowest priority cache by order)
+    SDImageCachesManagerOperationPolicyConcurrent, // process all caches concurrently
+    SDImageCachesManagerOperationPolicyHighestOnly, // process the highest priority cache only
+    SDImageCachesManagerOperationPolicyLowestOnly // process the lowest priority cache only
+};
+
+/**
+ A caches manager to manage multiple caches.
+ */
+@interface SDImageCachesManager : NSObject <SDImageCache>
+
+/**
+ Returns the global shared caches manager instance. By default we will set [`SDImageCache.sharedImageCache`] into the caches array.
+ */
+@property (nonatomic, class, readonly, nonnull) SDImageCachesManager *sharedManager;
+
+// These are op policy for cache manager.
+
+/**
+ Operation policy for query op.
+ Defaults to `Serial`, means query all caches serially (one completion called then next begin) until one cache query success (`image` != nil).
+ */
+@property (nonatomic, assign) SDImageCachesManagerOperationPolicy queryOperationPolicy;
+
+/**
+ Operation policy for store op.
+ Defaults to `HighestOnly`, means store to the highest priority cache only.
+ */
+@property (nonatomic, assign) SDImageCachesManagerOperationPolicy storeOperationPolicy;
+
+/**
+ Operation policy for remove op.
+ Defaults to `Concurrent`, means remove all caches concurrently.
+ */
+@property (nonatomic, assign) SDImageCachesManagerOperationPolicy removeOperationPolicy;
+
+/**
+ Operation policy for contains op.
+ Defaults to `Serial`, means check all caches serially (one completion called then next begin) until one cache check success (`containsCacheType` != None).
+ */
+@property (nonatomic, assign) SDImageCachesManagerOperationPolicy containsOperationPolicy;
+
+/**
+ Operation policy for clear op.
+ Defaults to `Concurrent`, means clear all caches concurrently.
+ */
+@property (nonatomic, assign) SDImageCachesManagerOperationPolicy clearOperationPolicy;
+
+/**
+ All caches in caches manager. The caches array is a priority queue, which means the later added cache will have the highest priority
+ */
+@property (nonatomic, copy, nullable) NSArray<id<SDImageCache>> *caches;
+
+/**
+ Add a new cache to the end of caches array. Which has the highest priority.
+ 
+ @param cache cache
+ */
+- (void)addCache:(nonnull id<SDImageCache>)cache;
+
+/**
+ Remove a cache in the caches array.
+ 
+ @param cache cache
+ */
+- (void)removeCache:(nonnull id<SDImageCache>)cache;
+
+@end
diff --git a/SDWebImage/Core/SDImageCachesManager.m b/SDWebImage/Core/SDImageCachesManager.m
new file mode 100644
index 000000000..b1098a348
--- /dev/null
+++ b/SDWebImage/Core/SDImageCachesManager.m
@@ -0,0 +1,575 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDImageCachesManager.h"
+#import "SDImageCachesManagerOperation.h"
+#import "SDImageCache.h"
+#import "SDInternalMacros.h"
+
+@interface SDImageCachesManager ()
+
+@property (nonatomic, strong, nonnull) NSMutableArray<id<SDImageCache>> *imageCaches;
+
+@end
+
+@implementation SDImageCachesManager {
+    SD_LOCK_DECLARE(_cachesLock);
+}
+
++ (SDImageCachesManager *)sharedManager {
+    static dispatch_once_t onceToken;
+    static SDImageCachesManager *manager;
+    dispatch_once(&onceToken, ^{
+        manager = [[SDImageCachesManager alloc] init];
+    });
+    return manager;
+}
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        self.queryOperationPolicy = SDImageCachesManagerOperationPolicySerial;
+        self.storeOperationPolicy = SDImageCachesManagerOperationPolicyHighestOnly;
+        self.removeOperationPolicy = SDImageCachesManagerOperationPolicyConcurrent;
+        self.containsOperationPolicy = SDImageCachesManagerOperationPolicySerial;
+        self.clearOperationPolicy = SDImageCachesManagerOperationPolicyConcurrent;
+        // initialize with default image caches
+        _imageCaches = [NSMutableArray arrayWithObject:[SDImageCache sharedImageCache]];
+        SD_LOCK_INIT(_cachesLock);
+    }
+    return self;
+}
+
+- (NSArray<id<SDImageCache>> *)caches {
+    SD_LOCK(_cachesLock);
+    NSArray<id<SDImageCache>> *caches = [_imageCaches copy];
+    SD_UNLOCK(_cachesLock);
+    return caches;
+}
+
+- (void)setCaches:(NSArray<id<SDImageCache>> *)caches {
+    SD_LOCK(_cachesLock);
+    [_imageCaches removeAllObjects];
+    if (caches.count) {
+        [_imageCaches addObjectsFromArray:caches];
+    }
+    SD_UNLOCK(_cachesLock);
+}
+
+#pragma mark - Cache IO operations
+
+- (void)addCache:(id<SDImageCache>)cache {
+    if (![cache conformsToProtocol:@protocol(SDImageCache)]) {
+        return;
+    }
+    SD_LOCK(_cachesLock);
+    [_imageCaches addObject:cache];
+    SD_UNLOCK(_cachesLock);
+}
+
+- (void)removeCache:(id<SDImageCache>)cache {
+    if (![cache conformsToProtocol:@protocol(SDImageCache)]) {
+        return;
+    }
+    SD_LOCK(_cachesLock);
+    [_imageCaches removeObject:cache];
+    SD_UNLOCK(_cachesLock);
+}
+
+#pragma mark - SDImageCache
+
+- (id<SDWebImageOperation>)queryImageForKey:(NSString *)key options:(SDWebImageOptions)options context:(SDWebImageContext *)context completion:(SDImageCacheQueryCompletionBlock)completionBlock {
+    return [self queryImageForKey:key options:options context:context cacheType:SDImageCacheTypeAll completion:completionBlock];
+}
+
+- (id<SDWebImageOperation>)queryImageForKey:(NSString *)key options:(SDWebImageOptions)options context:(SDWebImageContext *)context cacheType:(SDImageCacheType)cacheType completion:(SDImageCacheQueryCompletionBlock)completionBlock {
+    if (!key) {
+        return nil;
+    }
+    NSArray<id<SDImageCache>> *caches = self.caches;
+    NSUInteger count = caches.count;
+    if (count == 0) {
+        return nil;
+    } else if (count == 1) {
+        return [caches.firstObject queryImageForKey:key options:options context:context cacheType:cacheType completion:completionBlock];
+    }
+    switch (self.queryOperationPolicy) {
+        case SDImageCachesManagerOperationPolicyHighestOnly: {
+            id<SDImageCache> cache = caches.lastObject;
+            return [cache queryImageForKey:key options:options context:context cacheType:cacheType completion:completionBlock];
+        }
+            break;
+        case SDImageCachesManagerOperationPolicyLowestOnly: {
+            id<SDImageCache> cache = caches.firstObject;
+            return [cache queryImageForKey:key options:options context:context cacheType:cacheType completion:completionBlock];
+        }
+            break;
+        case SDImageCachesManagerOperationPolicyConcurrent: {
+            SDImageCachesManagerOperation *operation = [SDImageCachesManagerOperation new];
+            [operation beginWithTotalCount:caches.count];
+            [self concurrentQueryImageForKey:key options:options context:context cacheType:cacheType completion:completionBlock enumerator:caches.reverseObjectEnumerator operation:operation];
+            return operation;
+        }
+            break;
+        case SDImageCachesManagerOperationPolicySerial: {
+            SDImageCachesManagerOperation *operation = [SDImageCachesManagerOperation new];
+            [operation beginWithTotalCount:caches.count];
+            [self serialQueryImageForKey:key options:options context:context cacheType:cacheType completion:completionBlock enumerator:caches.reverseObjectEnumerator operation:operation];
+            return operation;
+        }
+            break;
+        default:
+            return nil;
+            break;
+    }
+}
+
+- (void)storeImage:(UIImage *)image imageData:(NSData *)imageData forKey:(NSString *)key cacheType:(SDImageCacheType)cacheType completion:(SDWebImageNoParamsBlock)completionBlock {
+    [self storeImage:image imageData:imageData forKey:key options:0 context:nil cacheType:cacheType completion:completionBlock];
+}
+
+- (void)storeImage:(UIImage *)image imageData:(NSData *)imageData forKey:(NSString *)key options:(SDWebImageOptions)options context:(SDWebImageContext *)context cacheType:(SDImageCacheType)cacheType completion:(SDWebImageNoParamsBlock)completionBlock {
+    if (!key) {
+        return;
+    }
+    NSArray<id<SDImageCache>> *caches = self.caches;
+    NSUInteger count = caches.count;
+    if (count == 0) {
+        return;
+    } else if (count == 1) {
+        [caches.firstObject storeImage:image imageData:imageData forKey:key options:options context:context cacheType:cacheType completion:completionBlock];
+        return;
+    }
+    switch (self.storeOperationPolicy) {
+        case SDImageCachesManagerOperationPolicyHighestOnly: {
+            id<SDImageCache> cache = caches.lastObject;
+            [cache storeImage:image imageData:imageData forKey:key options:options context:context cacheType:cacheType completion:completionBlock];
+        }
+            break;
+        case SDImageCachesManagerOperationPolicyLowestOnly: {
+            id<SDImageCache> cache = caches.firstObject;
+            [cache storeImage:image imageData:imageData forKey:key options:options context:context cacheType:cacheType completion:completionBlock];
+        }
+            break;
+        case SDImageCachesManagerOperationPolicyConcurrent: {
+            SDImageCachesManagerOperation *operation = [SDImageCachesManagerOperation new];
+            [operation beginWithTotalCount:caches.count];
+            [self concurrentStoreImage:image imageData:imageData forKey:key options:options context:context cacheType:cacheType completion:completionBlock enumerator:caches.reverseObjectEnumerator operation:operation];
+        }
+            break;
+        case SDImageCachesManagerOperationPolicySerial: {
+            [self serialStoreImage:image imageData:imageData forKey:key options:options context:context cacheType:cacheType completion:completionBlock enumerator:caches.reverseObjectEnumerator];
+        }
+            break;
+        default:
+            break;
+    }
+}
+
+- (void)removeImageForKey:(NSString *)key cacheType:(SDImageCacheType)cacheType completion:(SDWebImageNoParamsBlock)completionBlock {
+    if (!key) {
+        return;
+    }
+    NSArray<id<SDImageCache>> *caches = self.caches;
+    NSUInteger count = caches.count;
+    if (count == 0) {
+        return;
+    } else if (count == 1) {
+        [caches.firstObject removeImageForKey:key cacheType:cacheType completion:completionBlock];
+        return;
+    }
+    switch (self.removeOperationPolicy) {
+        case SDImageCachesManagerOperationPolicyHighestOnly: {
+            id<SDImageCache> cache = caches.lastObject;
+            [cache removeImageForKey:key cacheType:cacheType completion:completionBlock];
+        }
+            break;
+        case SDImageCachesManagerOperationPolicyLowestOnly: {
+            id<SDImageCache> cache = caches.firstObject;
+            [cache removeImageForKey:key cacheType:cacheType completion:completionBlock];
+        }
+            break;
+        case SDImageCachesManagerOperationPolicyConcurrent: {
+            SDImageCachesManagerOperation *operation = [SDImageCachesManagerOperation new];
+            [operation beginWithTotalCount:caches.count];
+            [self concurrentRemoveImageForKey:key cacheType:cacheType completion:completionBlock enumerator:caches.reverseObjectEnumerator operation:operation];
+        }
+            break;
+        case SDImageCachesManagerOperationPolicySerial: {
+            [self serialRemoveImageForKey:key cacheType:cacheType completion:completionBlock enumerator:caches.reverseObjectEnumerator];
+        }
+            break;
+        default:
+            break;
+    }
+}
+
+- (void)containsImageForKey:(NSString *)key cacheType:(SDImageCacheType)cacheType completion:(SDImageCacheContainsCompletionBlock)completionBlock {
+    if (!key) {
+        return;
+    }
+    NSArray<id<SDImageCache>> *caches = self.caches;
+    NSUInteger count = caches.count;
+    if (count == 0) {
+        return;
+    } else if (count == 1) {
+        [caches.firstObject containsImageForKey:key cacheType:cacheType completion:completionBlock];
+        return;
+    }
+    switch (self.clearOperationPolicy) {
+        case SDImageCachesManagerOperationPolicyHighestOnly: {
+            id<SDImageCache> cache = caches.lastObject;
+            [cache containsImageForKey:key cacheType:cacheType completion:completionBlock];
+        }
+            break;
+        case SDImageCachesManagerOperationPolicyLowestOnly: {
+            id<SDImageCache> cache = caches.firstObject;
+            [cache containsImageForKey:key cacheType:cacheType completion:completionBlock];
+        }
+            break;
+        case SDImageCachesManagerOperationPolicyConcurrent: {
+            SDImageCachesManagerOperation *operation = [SDImageCachesManagerOperation new];
+            [operation beginWithTotalCount:caches.count];
+            [self concurrentContainsImageForKey:key cacheType:cacheType completion:completionBlock enumerator:caches.reverseObjectEnumerator operation:operation];
+        }
+            break;
+        case SDImageCachesManagerOperationPolicySerial: {
+            SDImageCachesManagerOperation *operation = [SDImageCachesManagerOperation new];
+            [operation beginWithTotalCount:caches.count];
+            [self serialContainsImageForKey:key cacheType:cacheType completion:completionBlock enumerator:caches.reverseObjectEnumerator operation:operation];
+        }
+            break;
+        default:
+            break;
+    }
+}
+
+- (void)clearWithCacheType:(SDImageCacheType)cacheType completion:(SDWebImageNoParamsBlock)completionBlock {
+    NSArray<id<SDImageCache>> *caches = self.caches;
+    NSUInteger count = caches.count;
+    if (count == 0) {
+        return;
+    } else if (count == 1) {
+        [caches.firstObject clearWithCacheType:cacheType completion:completionBlock];
+        return;
+    }
+    switch (self.clearOperationPolicy) {
+        case SDImageCachesManagerOperationPolicyHighestOnly: {
+            id<SDImageCache> cache = caches.lastObject;
+            [cache clearWithCacheType:cacheType completion:completionBlock];
+        }
+            break;
+        case SDImageCachesManagerOperationPolicyLowestOnly: {
+            id<SDImageCache> cache = caches.firstObject;
+            [cache clearWithCacheType:cacheType completion:completionBlock];
+        }
+            break;
+        case SDImageCachesManagerOperationPolicyConcurrent: {
+            SDImageCachesManagerOperation *operation = [SDImageCachesManagerOperation new];
+            [operation beginWithTotalCount:caches.count];
+            [self concurrentClearWithCacheType:cacheType completion:completionBlock enumerator:caches.reverseObjectEnumerator operation:operation];
+        }
+            break;
+        case SDImageCachesManagerOperationPolicySerial: {
+            [self serialClearWithCacheType:cacheType completion:completionBlock enumerator:caches.reverseObjectEnumerator];
+        }
+            break;
+        default:
+            break;
+    }
+}
+
+#pragma mark - Concurrent Operation
+
+- (void)concurrentQueryImageForKey:(NSString *)key options:(SDWebImageOptions)options context:(SDWebImageContext *)context cacheType:(SDImageCacheType)queryCacheType completion:(SDImageCacheQueryCompletionBlock)completionBlock enumerator:(NSEnumerator<id<SDImageCache>> *)enumerator operation:(SDImageCachesManagerOperation *)operation {
+    NSParameterAssert(enumerator);
+    NSParameterAssert(operation);
+    for (id<SDImageCache> cache in enumerator) {
+        [cache queryImageForKey:key options:options context:context cacheType:queryCacheType completion:^(UIImage * _Nullable image, NSData * _Nullable data, SDImageCacheType cacheType) {
+            if (operation.isCancelled) {
+                // Cancelled
+                return;
+            }
+            if (operation.isFinished) {
+                // Finished
+                return;
+            }
+            [operation completeOne];
+            if (image) {
+                // Success
+                [operation done];
+                if (completionBlock) {
+                    completionBlock(image, data, cacheType);
+                }
+                return;
+            }
+            if (operation.pendingCount == 0) {
+                // Complete
+                [operation done];
+                if (completionBlock) {
+                    completionBlock(nil, nil, SDImageCacheTypeNone);
+                }
+            }
+        }];
+    }
+}
+
+- (void)concurrentStoreImage:(UIImage *)image imageData:(NSData *)imageData forKey:(NSString *)key options:(SDWebImageOptions)options context:(SDWebImageContext *)context cacheType:(SDImageCacheType)cacheType completion:(SDWebImageNoParamsBlock)completionBlock enumerator:(NSEnumerator<id<SDImageCache>> *)enumerator operation:(SDImageCachesManagerOperation *)operation {
+    NSParameterAssert(enumerator);
+    NSParameterAssert(operation);
+    for (id<SDImageCache> cache in enumerator) {
+        [cache storeImage:image imageData:imageData forKey:key options:options context:context cacheType:cacheType completion:^{
+            if (operation.isCancelled) {
+                // Cancelled
+                return;
+            }
+            if (operation.isFinished) {
+                // Finished
+                return;
+            }
+            [operation completeOne];
+            if (operation.pendingCount == 0) {
+                // Complete
+                [operation done];
+                if (completionBlock) {
+                    completionBlock();
+                }
+            }
+        }];
+    }
+}
+
+- (void)concurrentRemoveImageForKey:(NSString *)key cacheType:(SDImageCacheType)cacheType completion:(SDWebImageNoParamsBlock)completionBlock enumerator:(NSEnumerator<id<SDImageCache>> *)enumerator operation:(SDImageCachesManagerOperation *)operation {
+    NSParameterAssert(enumerator);
+    NSParameterAssert(operation);
+    for (id<SDImageCache> cache in enumerator) {
+        [cache removeImageForKey:key cacheType:cacheType completion:^{
+            if (operation.isCancelled) {
+                // Cancelled
+                return;
+            }
+            if (operation.isFinished) {
+                // Finished
+                return;
+            }
+            [operation completeOne];
+            if (operation.pendingCount == 0) {
+                // Complete
+                [operation done];
+                if (completionBlock) {
+                    completionBlock();
+                }
+            }
+        }];
+    }
+}
+
+- (void)concurrentContainsImageForKey:(NSString *)key cacheType:(SDImageCacheType)cacheType completion:(SDImageCacheContainsCompletionBlock)completionBlock enumerator:(NSEnumerator<id<SDImageCache>> *)enumerator operation:(SDImageCachesManagerOperation *)operation {
+    NSParameterAssert(enumerator);
+    NSParameterAssert(operation);
+    for (id<SDImageCache> cache in enumerator) {
+        [cache containsImageForKey:key cacheType:cacheType completion:^(SDImageCacheType containsCacheType) {
+            if (operation.isCancelled) {
+                // Cancelled
+                return;
+            }
+            if (operation.isFinished) {
+                // Finished
+                return;
+            }
+            [operation completeOne];
+            if (containsCacheType != SDImageCacheTypeNone) {
+                // Success
+                [operation done];
+                if (completionBlock) {
+                    completionBlock(containsCacheType);
+                }
+                return;
+            }
+            if (operation.pendingCount == 0) {
+                // Complete
+                [operation done];
+                if (completionBlock) {
+                    completionBlock(SDImageCacheTypeNone);
+                }
+            }
+        }];
+    }
+}
+
+- (void)concurrentClearWithCacheType:(SDImageCacheType)cacheType completion:(SDWebImageNoParamsBlock)completionBlock enumerator:(NSEnumerator<id<SDImageCache>> *)enumerator operation:(SDImageCachesManagerOperation *)operation {
+    NSParameterAssert(enumerator);
+    NSParameterAssert(operation);
+    for (id<SDImageCache> cache in enumerator) {
+        [cache clearWithCacheType:cacheType completion:^{
+            if (operation.isCancelled) {
+                // Cancelled
+                return;
+            }
+            if (operation.isFinished) {
+                // Finished
+                return;
+            }
+            [operation completeOne];
+            if (operation.pendingCount == 0) {
+                // Complete
+                [operation done];
+                if (completionBlock) {
+                    completionBlock();
+                }
+            }
+        }];
+    }
+}
+
+#pragma mark - Serial Operation
+
+- (void)serialQueryImageForKey:(NSString *)key options:(SDWebImageOptions)options context:(SDWebImageContext *)context cacheType:(SDImageCacheType)queryCacheType completion:(SDImageCacheQueryCompletionBlock)completionBlock enumerator:(NSEnumerator<id<SDImageCache>> *)enumerator operation:(SDImageCachesManagerOperation *)operation {
+    NSParameterAssert(enumerator);
+    NSParameterAssert(operation);
+    id<SDImageCache> cache = enumerator.nextObject;
+    if (!cache) {
+        // Complete
+        [operation done];
+        if (completionBlock) {
+            completionBlock(nil, nil, SDImageCacheTypeNone);
+        }
+        return;
+    }
+    @weakify(self);
+    [cache queryImageForKey:key options:options context:context cacheType:queryCacheType completion:^(UIImage * _Nullable image, NSData * _Nullable data, SDImageCacheType cacheType) {
+        @strongify(self);
+        if (!self) {
+            return;
+        }
+        if (operation.isCancelled) {
+            // Cancelled
+            return;
+        }
+        if (operation.isFinished) {
+            // Finished
+            return;
+        }
+        [operation completeOne];
+        if (image) {
+            // Success
+            [operation done];
+            if (completionBlock) {
+                completionBlock(image, data, cacheType);
+            }
+            return;
+        }
+        // Next
+        [self serialQueryImageForKey:key options:options context:context cacheType:queryCacheType completion:completionBlock enumerator:enumerator operation:operation];
+    }];
+}
+
+- (void)serialStoreImage:(UIImage *)image imageData:(NSData *)imageData forKey:(NSString *)key options:(SDWebImageOptions)options context:(SDWebImageContext *)context cacheType:(SDImageCacheType)cacheType completion:(SDWebImageNoParamsBlock)completionBlock enumerator:(NSEnumerator<id<SDImageCache>> *)enumerator {
+    NSParameterAssert(enumerator);
+    id<SDImageCache> cache = enumerator.nextObject;
+    if (!cache) {
+        // Complete
+        if (completionBlock) {
+            completionBlock();
+        }
+        return;
+    }
+    @weakify(self);
+    [cache storeImage:image imageData:imageData forKey:key options:options context:context cacheType:cacheType completion:^{
+        @strongify(self);
+        if (!self) {
+            return;
+        }
+        // Next
+        [self serialStoreImage:image imageData:imageData forKey:key options:options context:context cacheType:cacheType completion:completionBlock enumerator:enumerator];
+    }];
+}
+
+- (void)serialRemoveImageForKey:(NSString *)key cacheType:(SDImageCacheType)cacheType completion:(SDWebImageNoParamsBlock)completionBlock enumerator:(NSEnumerator<id<SDImageCache>> *)enumerator {
+    NSParameterAssert(enumerator);
+    id<SDImageCache> cache = enumerator.nextObject;
+    if (!cache) {
+        // Complete
+        if (completionBlock) {
+            completionBlock();
+        }
+        return;
+    }
+    @weakify(self);
+    [cache removeImageForKey:key cacheType:cacheType completion:^{
+        @strongify(self);
+        if (!self) {
+            return;
+        }
+        // Next
+        [self serialRemoveImageForKey:key cacheType:cacheType completion:completionBlock enumerator:enumerator];
+    }];
+}
+
+- (void)serialContainsImageForKey:(NSString *)key cacheType:(SDImageCacheType)cacheType completion:(SDImageCacheContainsCompletionBlock)completionBlock enumerator:(NSEnumerator<id<SDImageCache>> *)enumerator operation:(SDImageCachesManagerOperation *)operation {
+    NSParameterAssert(enumerator);
+    NSParameterAssert(operation);
+    id<SDImageCache> cache = enumerator.nextObject;
+    if (!cache) {
+        // Complete
+        [operation done];
+        if (completionBlock) {
+            completionBlock(SDImageCacheTypeNone);
+        }
+        return;
+    }
+    @weakify(self);
+    [cache containsImageForKey:key cacheType:cacheType completion:^(SDImageCacheType containsCacheType) {
+        @strongify(self);
+        if (!self) {
+            return;
+        }
+        if (operation.isCancelled) {
+            // Cancelled
+            return;
+        }
+        if (operation.isFinished) {
+            // Finished
+            return;
+        }
+        [operation completeOne];
+        if (containsCacheType != SDImageCacheTypeNone) {
+            // Success
+            [operation done];
+            if (completionBlock) {
+                completionBlock(containsCacheType);
+            }
+            return;
+        }
+        // Next
+        [self serialContainsImageForKey:key cacheType:cacheType completion:completionBlock enumerator:enumerator operation:operation];
+    }];
+}
+
+- (void)serialClearWithCacheType:(SDImageCacheType)cacheType completion:(SDWebImageNoParamsBlock)completionBlock enumerator:(NSEnumerator<id<SDImageCache>> *)enumerator {
+    NSParameterAssert(enumerator);
+    id<SDImageCache> cache = enumerator.nextObject;
+    if (!cache) {
+        // Complete
+        if (completionBlock) {
+            completionBlock();
+        }
+        return;
+    }
+    @weakify(self);
+    [cache clearWithCacheType:cacheType completion:^{
+        @strongify(self);
+        if (!self) {
+            return;
+        }
+        // Next
+        [self serialClearWithCacheType:cacheType completion:completionBlock enumerator:enumerator];
+    }];
+}
+
+@end
diff --git a/SDWebImage/Core/SDImageCoder.h b/SDWebImage/Core/SDImageCoder.h
new file mode 100644
index 000000000..373fc17d9
--- /dev/null
+++ b/SDWebImage/Core/SDImageCoder.h
@@ -0,0 +1,347 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCompat.h"
+#import "NSData+ImageContentType.h"
+#import "SDImageFrame.h"
+
+/// Image Decoding/Encoding Options
+typedef NSString * SDImageCoderOption NS_STRING_ENUM;
+typedef NSDictionary<SDImageCoderOption, id> SDImageCoderOptions;
+typedef NSMutableDictionary<SDImageCoderOption, id> SDImageCoderMutableOptions;
+
+#pragma mark - Image Decoding Options
+// These options are for image decoding
+/**
+ A Boolean value indicating whether to decode the first frame only for animated image during decoding. (NSNumber). If not provide, decode animated image if need.
+ @note works for `SDImageCoder`.
+ */
+FOUNDATION_EXPORT SDImageCoderOption _Nonnull const SDImageCoderDecodeFirstFrameOnly;
+
+/**
+ A CGFloat value which is greater than or equal to 1.0. This value specify the image scale factor for decoding. If not provide, use 1.0. (NSNumber)
+ @note works for `SDImageCoder`, `SDProgressiveImageCoder`, `SDAnimatedImageCoder`.
+ */
+FOUNDATION_EXPORT SDImageCoderOption _Nonnull const SDImageCoderDecodeScaleFactor;
+
+/**
+ A Boolean value indicating whether to keep the original aspect ratio when generating thumbnail images (or bitmap images from vector format).
+ Defaults to YES.
+ @note works for `SDImageCoder`, `SDProgressiveImageCoder`, `SDAnimatedImageCoder`.
+ */
+FOUNDATION_EXPORT SDImageCoderOption _Nonnull const SDImageCoderDecodePreserveAspectRatio;
+
+/**
+ A CGSize value indicating whether or not to generate the thumbnail images (or bitmap images from vector format). When this value is provided, the decoder will generate a thumbnail image which pixel size is smaller than or equal to (depends the `.preserveAspectRatio`) the value size.
+ Defaults to CGSizeZero, which means no thumbnail generation at all.
+ @note Supports for animated image as well.
+ @note When you pass `.preserveAspectRatio == NO`, the thumbnail image is stretched to match each dimension. When `.preserveAspectRatio == YES`, the thumbnail image's width is limited to pixel size's width, the thumbnail image's height is limited to pixel size's height. For common cases, you can just pass a square size to limit both.
+ @note works for `SDImageCoder`, `SDProgressiveImageCoder`, `SDAnimatedImageCoder`.
+ */
+FOUNDATION_EXPORT SDImageCoderOption _Nonnull const SDImageCoderDecodeThumbnailPixelSize;
+
+/**
+ A NSString value indicating the source image's file extension. Example: "jpg", "nef", "tif", don't prefix the dot
+ Some image file format share the same data structure but has different tag explanation, like TIFF and NEF/SRW, see https://en.wikipedia.org/wiki/TIFF
+ Changing the file extension cause the different image result. The coder (like ImageIO) may use file extension to choose the correct parser
+ @note However, different UTType may share the same file extension, like `public.jpeg` and `public.jpeg-2000` both use `.jpg`. If you want detail control, use `TypeIdentifierHint` below
+ */
+FOUNDATION_EXPORT SDImageCoderOption _Nonnull const SDImageCoderDecodeFileExtensionHint;
+
+/**
+ A NSString value (UTI) indicating the source image's file extension. Example: "public.jpeg-2000", "com.nikon.raw-image", "public.tiff"
+ Some image file format share the same data structure but has different tag explanation, like TIFF and NEF/SRW, see https://en.wikipedia.org/wiki/TIFF
+ Changing the file extension cause the different image result. The coder (like ImageIO) may use file extension to choose the correct parser
+ @note If you provide `TypeIdentifierHint`, the `FileExtensionHint` option above will be ignored (because UTType has high priority)
+ @note If you really don't want any hint which effect the image result, pass `NSNull.null` instead
+ */
+FOUNDATION_EXPORT SDImageCoderOption _Nonnull const SDImageCoderDecodeTypeIdentifierHint;
+
+/**
+ A BOOL value indicating whether to use lazy-decoding. Defaults to NO on animated image coder, but defaults to YES on static image coder.
+ CGImageRef, this image object typically support lazy-decoding, via the `CGDataProviderCreateDirectAccess` or `CGDataProviderCreateSequential`
+ Which allows you to provide a lazy-called callback to access bitmap buffer, so that you can achieve lazy-decoding when consumer actually need bitmap buffer
+ UIKit on iOS use heavy on this and ImageIO codec prefers to lazy-decoding for common Hardware-Accelerate format like JPEG/PNG/HEIC
+ But however, the consumer may access bitmap buffer when running on main queue, like CoreAnimation layer render image. So this is a trade-off
+ You can force us to disable the lazy-decoding and always allocate bitmap buffer on RAM, but this may have higher ratio of OOM (out of memory)
+ @note The default value is NO for animated image coder (means `animatedImageFrameAtIndex:`)
+ @note The default value is YES for static image coder (means `decodedImageWithData:`)
+ @note works for `SDImageCoder`, `SDProgressiveImageCoder`, `SDAnimatedImageCoder`.
+ */
+FOUNDATION_EXPORT SDImageCoderOption _Nonnull const SDImageCoderDecodeUseLazyDecoding;
+
+/**
+ A NSUInteger value to provide the limit bytes during decoding. This can help to avoid OOM on large frame count animated image or large pixel static image when you don't know how much RAM it occupied before decoding
+ The decoder will do these logic based on limit bytes:
+ 1. Get the total frame count (static image means 1)
+ 2. Calculate the `framePixelSize` width/height to `sqrt(limitBytes / frameCount / bytesPerPixel)`, keeping aspect ratio (at least 1x1)
+ 3. If the `framePixelSize < originalImagePixelSize`, then do thumbnail decoding (see `SDImageCoderDecodeThumbnailPixelSize`) use the `framePixelSize` and `preseveAspectRatio = YES`
+ 4. Else, use the full pixel decoding (small than limit bytes)
+ 5. Whatever result, this does not effect the animated/static behavior of image. So even if you set `limitBytes = 1 && frameCount = 100`, we will stll create animated image with each frame `1x1` pixel size.
+ @note You can use the logic from `+[SDImageCoder scaledSizeWithImageSize:limitBytes:bytesPerPixel:frameCount:]`
+ @note This option has higher priority than `.decodeThumbnailPixelSize`
+ */
+FOUNDATION_EXPORT SDImageCoderOption _Nonnull const SDImageCoderDecodeScaleDownLimitBytes;
+
+/**
+ A Boolean (`SDImageHDRType.rawValue`) value (stored inside NSNumber) to provide converting to HDR during decoding. Currently if number is 0 (`SDImageHDRTypeSDR`), use SDR, else use HDR. But we may extend this option to represent `SDImageHDRType` all cases in the future (means, think this options as uint number, but not actual boolean)
+ @note Supported by iOS 17 and above when using ImageIO coder (third-party coder can support lower firmware)
+ Defaults to @(NO), decoder will automatically convert SDR.
+ @note works for `SDImageCoder`
+ */
+FOUNDATION_EXPORT SDImageCoderOption _Nonnull const SDImageCoderDecodeToHDR;
+
+#pragma mark - Image Encoding Options
+/**
+ A NSUInteger (`SDImageHDRType.rawValue`) value (stored inside NSNumber) to provide converting to HDR during encoding. Read the below carefully to choose the value.
+ @note 0(`SDImageHDRTypeSDR`) means SDR; 1(`SDImageHDRTypeISOHDR`) means ISO HDR (at least using 10 bits per components or above, supported by AVIF/HEIF/JPEG-XL); 2(`SDImageHDRTypeISOGainMap`) means ISO Gain Map HDR (may use 8 bits per components, supported by AVIF/HEIF/JPEG-XL, as well as traditional JPEG)
+ @note Gain Map like a mask image with metadata, which contains the depth/bright information for pixels (1/4 resolution), which used to convert between HDR and SDR.
+ @note If you use CIImage as HDR pipeline, you can export as CGImage for encoding. (But it's also recommanded to use CIImage's `JPEGRepresentationOfImage` or `HEIFRepresentationOfImage`)
+ @note Supported by iOS 18 and above when using ImageIO coder (third-party coder can support lower firmware)
+ Defaults to @(0), encoder will automatically convert SDR.
+ @note works for `SDImageCoder`
+ */
+FOUNDATION_EXPORT SDImageCoderOption _Nonnull const SDImageCoderEncodeToHDR;
+
+/**
+ A Boolean value indicating whether to encode the first frame only for animated image during encoding. (NSNumber). If not provide, encode animated image if need.
+ @note works for `SDImageCoder`.
+ */
+FOUNDATION_EXPORT SDImageCoderOption _Nonnull const SDImageCoderEncodeFirstFrameOnly;
+/**
+ A double value between 0.0-1.0 indicating the encode compression quality to produce the image data. 1.0 resulting in no compression and 0.0 resulting in the maximum compression possible. If not provide, use 1.0. (NSNumber)
+ @note works for `SDImageCoder`
+ */
+FOUNDATION_EXPORT SDImageCoderOption _Nonnull const SDImageCoderEncodeCompressionQuality;
+
+/**
+ A UIColor(NSColor) value to used for non-alpha image encoding when the input image has alpha channel, the background color will be used to compose the alpha one. If not provide, use white color.
+ @note works for `SDImageCoder`
+ */
+FOUNDATION_EXPORT SDImageCoderOption _Nonnull const SDImageCoderEncodeBackgroundColor;
+
+/**
+ A CGSize value indicating the max image resolution in pixels during encoding. For vector image, this also effect the output vector data information about width and height. The encoder will not generate the encoded image larger than this limit. Note it always use the aspect ratio of input image..
+ Defaults to CGSizeZero, which means no max size limit at all.
+ @note Supports for animated image as well.
+ @note The output image's width is limited to pixel size's width, the output image's height is limited to pixel size's height. For common cases, you can just pass a square size to limit both.
+ @note works for `SDImageCoder`
+ */
+FOUNDATION_EXPORT SDImageCoderOption _Nonnull const SDImageCoderEncodeMaxPixelSize;
+
+/**
+ A NSUInteger value specify the max output data bytes size after encoding. Some lossy format like JPEG/HEIF supports the hint for codec to automatically reduce the quality and match the file size you want. Note this option will override the `SDImageCoderEncodeCompressionQuality`, because now the quality is decided by the encoder. (NSNumber)
+ @note This is a hint, no guarantee for output size because of compression algorithm limit. And this options does not works for vector images.
+ @note works for `SDImageCoder`
+ */
+FOUNDATION_EXPORT SDImageCoderOption _Nonnull const SDImageCoderEncodeMaxFileSize;
+
+/**
+ A Boolean value indicating the encoding format should contains a thumbnail image into the output data. Only some of image format (like JPEG/HEIF/AVIF) support this behavior. The embed thumbnail will be used during next time thumbnail decoding (provided `.thumbnailPixelSize`), which is faster than full image thumbnail decoding. (NSNumber)
+ Defaults to NO, which does not embed any thumbnail.
+ @note The thumbnail image's pixel size is not defined, the encoder can choose the proper pixel size which is suitable for encoding quality.
+ @note works for `SDImageCoder`
+ */
+FOUNDATION_EXPORT SDImageCoderOption _Nonnull const SDImageCoderEncodeEmbedThumbnail;
+
+/**
+ A SDWebImageContext object which hold the original context options from top-level API. (SDWebImageContext)
+ This option is ignored for all built-in coders and take no effect.
+ But this may be useful for some custom coders, because some business logic may dependent on things other than image or image data information only.
+ Only the unknown context from top-level API (See SDWebImageDefine.h) may be passed in during image loading.
+ See `SDWebImageContext` for more detailed information.
+ @warning Deprecated. This does nothing from 5.14.0. Use `SDWebImageContextImageDecodeOptions` to pass additional information in top-level API, and use `SDImageCoderOptions` to retrieve options from coder.
+ */
+FOUNDATION_EXPORT SDImageCoderOption _Nonnull const SDImageCoderWebImageContext API_DEPRECATED("No longer supported. Use SDWebImageContextDecodeOptions in loader API to provide options. Use SDImageCoderOptions in coder API to retrieve options.", macos(10.10, 10.10), ios(8.0, 8.0), tvos(9.0, 9.0), watchos(2.0, 2.0));
+
+#pragma mark - Coder
+/**
+ This is the image coder protocol to provide custom image decoding/encoding.
+ These methods are all required to implement.
+ @note Pay attention that these methods are not called from main queue.
+ */
+@protocol SDImageCoder <NSObject>
+
+@required
+#pragma mark - Decoding
+/**
+ Returns YES if this coder can decode some data. Otherwise, the data should be passed to another coder.
+ 
+ @param data The image data so we can look at it
+ @return YES if this coder can decode the data, NO otherwise
+ */
+- (BOOL)canDecodeFromData:(nullable NSData *)data;
+
+/**
+ Decode the image data to image.
+ @note This protocol may supports decode animated image frames. You can use `+[SDImageCoderHelper animatedImageWithFrames:]` to produce an animated image with frames.
+
+ @param data The image data to be decoded
+ @param options A dictionary containing any decoding options. Pass @{SDImageCoderDecodeScaleFactor: @(1.0)} to specify scale factor for image. Pass @{SDImageCoderDecodeFirstFrameOnly: @(YES)} to decode the first frame only.
+ @return The decoded image from data
+ */
+- (nullable UIImage *)decodedImageWithData:(nullable NSData *)data
+                                   options:(nullable SDImageCoderOptions *)options;
+
+#pragma mark - Encoding
+
+/**
+ Returns YES if this coder can encode some image. Otherwise, it should be passed to another coder.
+ For custom coder which introduce new image format, you'd better define a new `SDImageFormat` using like this. If you're creating public coder plugin for new image format, also update `https://github.com/rs/SDWebImage/wiki/Coder-Plugin-List` to avoid same value been defined twice.
+ * @code
+ static const SDImageFormat SDImageFormatHEIF = 10;
+ * @endcode
+ 
+ @param format The image format
+ @return YES if this coder can encode the image, NO otherwise
+ */
+- (BOOL)canEncodeToFormat:(SDImageFormat)format NS_SWIFT_NAME(canEncode(to:));
+
+/**
+ Encode the image to image data.
+ @note This protocol may supports encode animated image frames. You can use `+[SDImageCoderHelper framesFromAnimatedImage:]` to assemble an animated image with frames. But this consume time is not always reversible. In 5.15.0, we introduce `encodedDataWithFrames` API for better animated image encoding. Use that instead.
+ @note Which means, this just forward to `encodedDataWithFrames([SDImageFrame(image: image, duration: 0], image.sd_imageLoopCount))`
+
+ @param image The image to be encoded
+ @param format The image format to encode, you should note `SDImageFormatUndefined` format is also  possible
+ @param options A dictionary containing any encoding options. Pass @{SDImageCoderEncodeCompressionQuality: @(1)} to specify compression quality.
+ @return The encoded image data
+ */
+- (nullable NSData *)encodedDataWithImage:(nullable UIImage *)image
+                                   format:(SDImageFormat)format
+                                  options:(nullable SDImageCoderOptions *)options;
+
+#pragma mark - Animated Encoding
+@optional
+/**
+ Encode the animated image frames to image data.
+
+ @param frames The animated image frames to be encoded, should be at least 1 element, or it will fallback to static image encode.
+ @param loopCount The final animated image loop count. 0 means infinity loop. This config ignore each frame's `sd_imageLoopCount`
+ @param format The image format to encode, you should note `SDImageFormatUndefined` format is also  possible
+ @param options A dictionary containing any encoding options. Pass @{SDImageCoderEncodeCompressionQuality: @(1)} to specify compression quality.
+ @return The encoded image data
+ */
+- (nullable NSData *)encodedDataWithFrames:(nonnull NSArray<SDImageFrame *>*)frames
+                                 loopCount:(NSUInteger)loopCount
+                                    format:(SDImageFormat)format
+                                   options:(nullable SDImageCoderOptions *)options;
+@end
+
+#pragma mark - Progressive Coder
+/**
+ This is the image coder protocol to provide custom progressive image decoding.
+ These methods are all required to implement.
+ @note Pay attention that these methods are not called from main queue.
+ */
+@protocol SDProgressiveImageCoder <SDImageCoder>
+
+@required
+/**
+ Returns YES if this coder can incremental decode some data. Otherwise, it should be passed to another coder.
+ 
+ @param data The image data so we can look at it
+ @return YES if this coder can decode the data, NO otherwise
+ */
+- (BOOL)canIncrementalDecodeFromData:(nullable NSData *)data;
+
+/**
+ Because incremental decoding need to keep the decoded context, we will alloc a new instance with the same class for each download operation to avoid conflicts
+ This init method should not return nil
+
+ @param options A dictionary containing any progressive decoding options (instance-level). Pass @{SDImageCoderDecodeScaleFactor: @(1.0)} to specify scale factor for progressive animated image (each frames should use the same scale).
+ @return A new instance to do incremental decoding for the specify image format
+ */
+- (nonnull instancetype)initIncrementalWithOptions:(nullable SDImageCoderOptions *)options;
+
+/**
+ Update the incremental decoding when new image data available
+
+ @param data The image data has been downloaded so far
+ @param finished Whether the download has finished
+ */
+- (void)updateIncrementalData:(nullable NSData *)data finished:(BOOL)finished;
+
+/**
+ Incremental decode the current image data to image.
+ @note Due to the performance issue for progressive decoding and the integration for image view. This method may only return the first frame image even if the image data is animated image. If you want progressive animated image decoding, conform to `SDAnimatedImageCoder` protocol as well and use `animatedImageFrameAtIndex:` instead.
+
+ @param options A dictionary containing any progressive decoding options. Pass @{SDImageCoderDecodeScaleFactor: @(1.0)} to specify scale factor for progressive image
+ @return The decoded image from current data
+ */
+- (nullable UIImage *)incrementalDecodedImageWithOptions:(nullable SDImageCoderOptions *)options;
+
+@end
+
+#pragma mark - Animated Image Provider
+/**
+ This is the animated image protocol to provide the basic function for animated image rendering. It's adopted by `SDAnimatedImage` and `SDAnimatedImageCoder`
+ */
+@protocol SDAnimatedImageProvider <NSObject>
+
+@required
+/**
+ The original animated image data for current image. If current image is not an animated format, return nil.
+ We may use this method to grab back the original image data if need, such as NSCoding or compare.
+ 
+ @return The animated image data
+ */
+@property (nonatomic, copy, readonly, nullable) NSData *animatedImageData;
+
+/**
+ Total animated frame count.
+ If the frame count is less than 1, then the methods below will be ignored.
+ 
+ @return Total animated frame count.
+ */
+@property (nonatomic, assign, readonly) NSUInteger animatedImageFrameCount;
+/**
+ Animation loop count, 0 means infinite looping.
+ 
+ @return Animation loop count
+ */
+@property (nonatomic, assign, readonly) NSUInteger animatedImageLoopCount;
+/**
+ Returns the frame image from a specified index.
+ @note The index maybe randomly if one image was set to different imageViews, keep it re-entrant. (It's not recommend to store the images into array because it's memory consuming)
+ 
+ @param index Frame index (zero based).
+ @return Frame's image
+ */
+- (nullable UIImage *)animatedImageFrameAtIndex:(NSUInteger)index;
+/**
+ Returns the frames's duration from a specified index.
+ @note The index maybe randomly if one image was set to different imageViews, keep it re-entrant. (It's recommend to store the durations into array because it's not memory-consuming)
+ 
+ @param index Frame index (zero based).
+ @return Frame's duration
+ */
+- (NSTimeInterval)animatedImageDurationAtIndex:(NSUInteger)index;
+
+@end
+
+#pragma mark - Animated Coder
+/**
+ This is the animated image coder protocol for custom animated image class like  `SDAnimatedImage`. Through it inherit from `SDImageCoder`. We currentlly only use the method `canDecodeFromData:` to detect the proper coder for specify animated image format.
+ */
+@protocol SDAnimatedImageCoder <SDImageCoder, SDAnimatedImageProvider>
+
+@required
+/**
+ Because animated image coder should keep the original data, we will alloc a new instance with the same class for the specify animated image data
+ The init method should return nil if it can't decode the specify animated image data to produce any frame.
+ After the instance created, we may call methods in `SDAnimatedImageProvider` to produce animated image frame.
+
+ @param data The animated image data to be decode
+ @param options A dictionary containing any animated decoding options (instance-level). Pass @{SDImageCoderDecodeScaleFactor: @(1.0)} to specify scale factor for animated image (each frames should use the same scale).
+ @return A new instance to do animated decoding for specify image data
+ */
+- (nullable instancetype)initWithAnimatedImageData:(nullable NSData *)data options:(nullable SDImageCoderOptions *)options;
+
+@end
diff --git a/SDWebImage/Core/SDImageCoder.m b/SDWebImage/Core/SDImageCoder.m
new file mode 100644
index 000000000..ca1febfea
--- /dev/null
+++ b/SDWebImage/Core/SDImageCoder.m
@@ -0,0 +1,29 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDImageCoder.h"
+
+SDImageCoderOption const SDImageCoderDecodeFirstFrameOnly = @"decodeFirstFrameOnly";
+SDImageCoderOption const SDImageCoderDecodeScaleFactor = @"decodeScaleFactor";
+SDImageCoderOption const SDImageCoderDecodePreserveAspectRatio = @"decodePreserveAspectRatio";
+SDImageCoderOption const SDImageCoderDecodeThumbnailPixelSize = @"decodeThumbnailPixelSize";
+SDImageCoderOption const SDImageCoderDecodeFileExtensionHint = @"decodeFileExtensionHint";
+SDImageCoderOption const SDImageCoderDecodeTypeIdentifierHint = @"decodeTypeIdentifierHint";
+SDImageCoderOption const SDImageCoderDecodeUseLazyDecoding = @"decodeUseLazyDecoding";
+SDImageCoderOption const SDImageCoderDecodeScaleDownLimitBytes = @"decodeScaleDownLimitBytes";
+SDImageCoderOption const SDImageCoderDecodeToHDR = @"decodeToHDR";
+
+SDImageCoderOption const SDImageCoderEncodeToHDR = @"encodeToHDR";
+SDImageCoderOption const SDImageCoderEncodeFirstFrameOnly = @"encodeFirstFrameOnly";
+SDImageCoderOption const SDImageCoderEncodeCompressionQuality = @"encodeCompressionQuality";
+SDImageCoderOption const SDImageCoderEncodeBackgroundColor = @"encodeBackgroundColor";
+SDImageCoderOption const SDImageCoderEncodeMaxPixelSize = @"encodeMaxPixelSize";
+SDImageCoderOption const SDImageCoderEncodeMaxFileSize = @"encodeMaxFileSize";
+SDImageCoderOption const SDImageCoderEncodeEmbedThumbnail = @"encodeEmbedThumbnail";
+
+SDImageCoderOption const SDImageCoderWebImageContext = @"webImageContext";
diff --git a/SDWebImage/Core/SDImageCoderHelper.h b/SDWebImage/Core/SDImageCoderHelper.h
new file mode 100644
index 000000000..e55a3d400
--- /dev/null
+++ b/SDWebImage/Core/SDImageCoderHelper.h
@@ -0,0 +1,251 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <ImageIO/ImageIO.h>
+#import "SDWebImageCompat.h"
+#import "SDImageFrame.h"
+
+/// The options controls how we force pre-draw the image (to avoid lazy-decoding). Which need OS's framework compatibility
+typedef NS_ENUM(NSUInteger, SDImageCoderDecodeSolution) {
+    /// automatically choose the solution based on image format, hardware, OS version. This keep balance for compatibility and performance. Default after SDWebImage 5.13.0
+    SDImageCoderDecodeSolutionAutomatic,
+    /// always use CoreGraphics to draw on bitmap context and trigger decode. Best compatibility. Default before SDWebImage 5.13.0
+    SDImageCoderDecodeSolutionCoreGraphics,
+    /// available on iOS/tvOS 15+, use UIKit's new CGImageDecompressor/CMPhoto to decode. Best performance. If failed, will fallback to CoreGraphics as well
+    SDImageCoderDecodeSolutionUIKit
+};
+
+/// The policy to force-decode the origin CGImage (produced by Image Coder Plugin)
+/// Some CGImage may be lazy, or not lazy, but need extra copy to render on screen
+/// The force-decode step help to `pre-process` to get the best suitable CGImage to render, which can increase frame rate
+/// The downside is that force-decode may consume RAM and CPU, and may loss the `lazy` support (lazy CGImage can be purged when memory warning, and re-created if need), see more: `SDImageCoderDecodeUseLazyDecoding`
+typedef NS_ENUM(NSUInteger, SDImageForceDecodePolicy) {
+    /// Based on input CGImage's colorspace, alignment, bitmapinfo, if it may trigger `CA::copy_image` extra copy, we will force-decode, else don't
+    SDImageForceDecodePolicyAutomatic,
+    /// Never force decode input CGImage
+    SDImageForceDecodePolicyNever,
+    /// Always force decode input CGImage (only once)
+    SDImageForceDecodePolicyAlways
+};
+
+/// These enum is used to represent the High Dynamic Range type during image encoding/decoding.
+/// There are alao other HDR type in history before ISO Standard (ISO 21496-1), including Google and Apple's old OSs captured photos, but which is non-standard and we do not support.
+typedef NS_ENUM(NSUInteger, SDImageHDRType) {
+    /// SDR, mostly only 8 bits color per components, RGBA8
+    SDImageHDRTypeSDR = 0,
+    /// ISO HDR (supported by modern format only, like HEIF/AVIF/JPEG-XL)
+    SDImageHDRTypeISOHDR = 1,
+    /// ISO Gain Map based HDR (supported by nearly all format, including tranditional JPEG, which stored the gain map into XMP)
+    SDImageHDRTypeISOGainMap = 2,
+};
+
+/// Byte alignment the bytes size with alignment
+/// - Parameters:
+///   - size: The bytes size
+///   - alignment: The alignment, in bytes
+static inline size_t SDByteAlign(size_t size, size_t alignment) {
+    return ((size + (alignment - 1)) / alignment) * alignment;
+}
+
+/// The pixel format about the information to call `CGImageCreate` suitable for current hardware rendering
+typedef struct SDImagePixelFormat {
+    /// Typically is pre-multiplied RGBA8888 for alpha image, RGBX8888 for non-alpha image.
+    CGBitmapInfo bitmapInfo;
+    /// Typically is 32, the 8 pixels bytesPerRow.
+    size_t alignment;
+} SDImagePixelFormat;
+
+/**
+ Provide some common helper methods for building the image decoder/encoder.
+ */
+@interface SDImageCoderHelper : NSObject
+
+/**
+ Return an animated image with frames array.
+ For UIKit, this will apply the patch and then create animated UIImage. The patch is because that `+[UIImage animatedImageWithImages:duration:]` just use the average of duration for each image. So it will not work if different frame has different duration. Therefore we repeat the specify frame for specify times to let it work.
+ For AppKit before macOS 10.13, NSImage does not support animates other than GIF. This will try to encode the frames to GIF format and then create an animated NSImage for rendering. Attention the animated image may loss some detail if the input frames contain full alpha channel because GIF only supports 1 bit alpha channel. (For 1 pixel, either transparent or not)
+ For AppKit after macOS 10.14, use APNG format, which has a better render result.
+
+ @param frames The frames array. If no frames or frames is empty, return nil
+ @return A animated image for rendering on UIImageView(UIKit) or NSImageView(AppKit)
+ */
++ (UIImage * _Nullable)animatedImageWithFrames:(NSArray<SDImageFrame *> * _Nullable)frames;
+
+/**
+ Return frames array from an animated image.
+ For UIKit, this will unapply the patch for the description above and then create frames array. This will also work for normal animated UIImage.
+ For AppKit, NSImage does not support animates other than GIF. This will try to decode the GIF imageRep and then create frames array.
+
+ @param animatedImage A animated image. If it's not animated, return nil
+ @return The frames array
+ */
++ (NSArray<SDImageFrame *> * _Nullable)framesFromAnimatedImage:(UIImage * _Nullable)animatedImage NS_SWIFT_NAME(frames(from:));
+
+#pragma mark - Preferred Rendering Format
+/// For coders who use `CGImageCreate`, use the information below to create an effient CGImage which can be render on GPU without Core Animation's extra copy (`CA::Render::copy_image`), which can be debugged using `Color Copied Image` in Xcode Instruments
+/// `CGImageCreate`'s `bytesPerRow`, `space`, `bitmapInfo` params should use the information below.
+/**
+ Return the shared device-dependent RGB color space. This follows The Get Rule.
+ Because it's shared, you should not retain or release this object.
+ Typically is sRGB for iOS, screen color space (like Color LCD) for macOS.
+ 
+ @return The device-dependent RGB color space
+ */
++ (CGColorSpaceRef _Nonnull)colorSpaceGetDeviceRGB CF_RETURNS_NOT_RETAINED;
+
+/**
+ Tthis returns the pixel format **Preferred from current hardward && OS using runtime detection**
+ @param containsAlpha Whether the image to render contains alpha channel
+ */
++ (SDImagePixelFormat)preferredPixelFormat:(BOOL)containsAlpha;
+
+/**
+ Check whether CGImage is hardware supported to rendering on screen, without the trigger of `CA::Render::copy_image`
+ You can debug the copied image by using Xcode's `Color Copied Image`, the copied image will turn Cyan and occupy double RAM for bitmap buffer.
+ Typically, when the CGImage's using the method above (`colorspace` / `alignment` / `bitmapInfo`) can render withtout the copy.
+ */
++ (BOOL)CGImageIsHardwareSupported:(_Nonnull CGImageRef)cgImage;
+
+/**
+ Check whether CGImage contains alpha channel.
+ 
+ @param cgImage The CGImage
+ @return Return YES if CGImage contains alpha channel, otherwise return NO
+ */
++ (BOOL)CGImageContainsAlpha:(_Nonnull CGImageRef)cgImage;
+
+/**
+ Detect whether the CGImage is lazy and not-yet decoded. (lazy means, only when the caller access the underlying bitmap buffer via provider like `CGDataProviderCopyData` or `CGDataProviderRetainBytePtr`, the decoder will allocate memory, it's a lazy allocation)
+ The implementation use the Core Graphics internal to check whether the CGImage is `CGImageProvider` based, or `CGDataProvider` based. The `CGDataProvider` based is treated as non-lazy.
+ */
++ (BOOL)CGImageIsLazy:(_Nonnull CGImageRef)cgImage;
+
+/**
+ Check if the CGImage is using HDR color space.
+ @note This use the same implementation like Apple, to checkl if color space uses transfer functions defined in ITU Rec.2100
+ */
++ (BOOL)CGImageIsHDR:(_Nonnull CGImageRef)cgImage;
+
+/**
+ Create a decoded CGImage by the provided CGImage. This follows The Create Rule and you are response to call release after usage.
+ It will detect whether image contains alpha channel, then create a new bitmap context with the same size of image, and draw it. This can ensure that the image do not need extra decoding after been set to the imageView.
+ @note This actually call `CGImageCreateDecoded:orientation:` with the Up orientation.
+
+ @param cgImage The CGImage
+ @return A new created decoded image
+ */
++ (CGImageRef _Nullable)CGImageCreateDecoded:(_Nonnull CGImageRef)cgImage CF_RETURNS_RETAINED;
+
+/**
+ Create a decoded CGImage by the provided CGImage and orientation. This follows The Create Rule and you are response to call release after usage.
+ It will detect whether image contains alpha channel, then create a new bitmap context with the same size of image, and draw it. This can ensure that the image do not need extra decoding after been set to the imageView.
+ 
+ @param cgImage The CGImage
+ @param orientation The EXIF image orientation.
+ @return A new created decoded image
+ */
++ (CGImageRef _Nullable)CGImageCreateDecoded:(_Nonnull CGImageRef)cgImage orientation:(CGImagePropertyOrientation)orientation CF_RETURNS_RETAINED;
+
+/**
+ Create a scaled CGImage by the provided CGImage and size. This follows The Create Rule and you are response to call release after usage.
+ It will detect whether the image size matching the scale size, if not, stretch the image to the target size.
+ @note If you need to keep aspect ratio, you can calculate the scale size by using `scaledSizeWithImageSize` first.
+ @note This scale does not change bits per components (which means RGB888 in, RGB888 out), supports 8/16/32(float) bpc. But the method in UIImage+Transform does not gurantee this.
+ @note All supported CGImage pixel format: https://developer.apple.com/library/archive/documentation/GraphicsImaging/Conceptual/drawingwithquartz2d/dq_context/dq_context.html#//apple_ref/doc/uid/TP30001066-CH203-BCIBHHBB
+ 
+ @param cgImage The CGImage
+ @param size The scale size in pixel.
+ @return A new created scaled image
+ */
++ (CGImageRef _Nullable)CGImageCreateScaled:(_Nonnull CGImageRef)cgImage size:(CGSize)size CF_RETURNS_RETAINED;
+
+/** Scale the image size based on provided scale size, whether or not to preserve aspect ratio, whether or not to scale up.
+ @note For example, if you implements thumnail decoding, pass `shouldScaleUp` to NO to avoid the calculated size larger than image size.
+ 
+ @param imageSize The image size (in pixel or point defined by caller)
+ @param scaleSize The scale size (in pixel or point defined by caller)
+ @param preserveAspectRatio Whether or not to preserve aspect ratio
+ @param shouldScaleUp Whether or not to scale up (or scale down only)
+ */
++ (CGSize)scaledSizeWithImageSize:(CGSize)imageSize scaleSize:(CGSize)scaleSize preserveAspectRatio:(BOOL)preserveAspectRatio shouldScaleUp:(BOOL)shouldScaleUp;
+
+/// Calculate the limited image size with the bytes, when using `SDImageCoderDecodeScaleDownLimitBytes`. This preserve aspect ratio and never scale up
+/// @param imageSize The image size (in pixel or point defined by caller)
+/// @param limitBytes The limit bytes
+/// @param bytesPerPixel The bytes per pixel
+/// @param frameCount The image frame count, 0 means 1 frame as well
++ (CGSize)scaledSizeWithImageSize:(CGSize)imageSize limitBytes:(NSUInteger)limitBytes bytesPerPixel:(NSUInteger)bytesPerPixel frameCount:(NSUInteger)frameCount;
+/**
+ Return the decoded image by the provided image. This one unlike `CGImageCreateDecoded:`, will not decode the image which contains alpha channel or animated image. On iOS 15+, this may use `UIImage.preparingForDisplay()` to use CMPhoto for better performance than the old solution.
+ @param image The image to be decoded
+ @note This translate to `decodedImageWithImage:policy:` with automatic policy
+ @return The decoded image
+ */
++ (UIImage * _Nullable)decodedImageWithImage:(UIImage * _Nullable)image;
+
+/**
+ Return the decoded image by the provided image. This one unlike `CGImageCreateDecoded:`, will not decode the image which contains alpha channel or animated image. On iOS 15+, this may use `UIImage.preparingForDisplay()` to use CMPhoto for better performance than the old solution.
+ @param image The image to be decoded
+ @param policy The force decode policy to decode image, will effect the check whether input image need decode
+ @return The decoded image
+ */
++ (UIImage * _Nullable)decodedImageWithImage:(UIImage * _Nullable)image policy:(SDImageForceDecodePolicy)policy;
+
+/**
+ Return the decoded and probably scaled down image by the provided image. If the image pixels bytes size large than the limit bytes, will try to scale down. Or just works as `decodedImageWithImage:`, never scale up.
+ @warning You should not pass too small bytes, the suggestion value should be larger than 1MB. Even we use Tile Decoding to avoid OOM, however, small bytes will consume much more CPU time because we need to iterate more times to draw each tile.
+
+ @param image The image to be decoded and scaled down
+ @param bytes The limit bytes size. Provide 0 to use the build-in limit.
+ @note This translate to `decodedAndScaledDownImageWithImage:limitBytes:policy:` with automatic policy
+ @return The decoded and probably scaled down image
+ */
++ (UIImage * _Nullable)decodedAndScaledDownImageWithImage:(UIImage * _Nullable)image limitBytes:(NSUInteger)bytes;
+
+/**
+ Return the decoded and probably scaled down image by the provided image. If the image pixels bytes size large than the limit bytes, will try to scale down. Or just works as `decodedImageWithImage:`, never scale up.
+ @warning You should not pass too small bytes, the suggestion value should be larger than 1MB. Even we use Tile Decoding to avoid OOM, however, small bytes will consume much more CPU time because we need to iterate more times to draw each tile.
+
+ @param image The image to be decoded and scaled down
+ @param bytes The limit bytes size. Provide 0 to use the build-in limit.
+ @param policy The force decode policy to decode image, will effect the check whether input image need decode
+ @return The decoded and probably scaled down image
+ */
++ (UIImage * _Nullable)decodedAndScaledDownImageWithImage:(UIImage * _Nullable)image limitBytes:(NSUInteger)bytes policy:(SDImageForceDecodePolicy)policy;
+
+/**
+ Control the default force decode solution. Available solutions  in `SDImageCoderDecodeSolution`.
+ @note Defaults to `SDImageCoderDecodeSolutionAutomatic`, which prefers to use UIKit for JPEG/HEIF, and fallback on CoreGraphics. If you want control on your hand, set the other solution.
+ */
+@property (class, readwrite) SDImageCoderDecodeSolution defaultDecodeSolution;
+
+/**
+ Control the default limit bytes to scale down largest images.
+ This value must be larger than 4 Bytes (at least 1x1 pixel). Defaults to 60MB on iOS/tvOS, 90MB on macOS, 30MB on watchOS.
+ */
+@property (class, readwrite) NSUInteger defaultScaleDownLimitBytes;
+
+#if SD_UIKIT || SD_WATCH
+/**
+ Convert an EXIF image orientation to an iOS one.
+
+ @param exifOrientation EXIF orientation
+ @return iOS orientation
+ */
++ (UIImageOrientation)imageOrientationFromEXIFOrientation:(CGImagePropertyOrientation)exifOrientation NS_SWIFT_NAME(imageOrientation(from:));
+
+/**
+ Convert an iOS orientation to an EXIF image orientation.
+
+ @param imageOrientation iOS orientation
+ @return EXIF orientation
+ */
++ (CGImagePropertyOrientation)exifOrientationFromImageOrientation:(UIImageOrientation)imageOrientation;
+#endif
+
+@end
diff --git a/SDWebImage/Core/SDImageCoderHelper.m b/SDWebImage/Core/SDImageCoderHelper.m
new file mode 100644
index 000000000..b0cbab4fd
--- /dev/null
+++ b/SDWebImage/Core/SDImageCoderHelper.m
@@ -0,0 +1,1106 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDImageCoderHelper.h"
+#import "SDImageFrame.h"
+#import "NSImage+Compatibility.h"
+#import "NSData+ImageContentType.h"
+#import "SDAnimatedImageRep.h"
+#import "UIImage+ForceDecode.h"
+#import "SDAssociatedObject.h"
+#import "UIImage+Metadata.h"
+#import "SDInternalMacros.h"
+#import "SDGraphicsImageRenderer.h"
+#import "SDInternalMacros.h"
+#import "SDDeviceHelper.h"
+#import "SDImageIOAnimatedCoderInternal.h"
+#import "SDImageAPNGCoder.h"
+#import "SDImageGIFCoder.h"
+#import <Accelerate/Accelerate.h>
+
+#define kCGColorSpaceDeviceRGB CFSTR("kCGColorSpaceDeviceRGB")
+
+#if SD_UIKIT
+static inline UIImage *SDImageDecodeUIKit(UIImage *image) {
+    // See: https://developer.apple.com/documentation/uikit/uiimage/3750834-imagebypreparingfordisplay
+    // Need CGImage-based
+    if (@available(iOS 15, tvOS 15, *)) {
+        UIImage *decodedImage = [image imageByPreparingForDisplay];
+        if (decodedImage) {
+            SDImageCopyAssociatedObject(image, decodedImage);
+            decodedImage.sd_isDecoded = YES;
+            return decodedImage;
+        }
+    }
+    return nil;
+}
+
+static inline UIImage *SDImageDecodeAndScaleDownUIKit(UIImage *image, CGSize destResolution) {
+    // See: https://developer.apple.com/documentation/uikit/uiimage/3750835-imagebypreparingthumbnailofsize
+    // Need CGImage-based
+    if (@available(iOS 15, tvOS 15, *)) {
+        // Calculate thumbnail point size
+        CGFloat scale = image.scale ?: 1;
+        CGSize thumbnailSize = CGSizeMake(destResolution.width / scale, destResolution.height / scale);
+        UIImage *decodedImage = [image imageByPreparingThumbnailOfSize:thumbnailSize];
+        if (decodedImage) {
+            SDImageCopyAssociatedObject(image, decodedImage);
+            decodedImage.sd_isDecoded = YES;
+            return decodedImage;
+        }
+    }
+    return nil;
+}
+
+static inline BOOL SDImageSupportsHardwareHEVCDecoder(void) {
+    static dispatch_once_t onceToken;
+    static BOOL supportsHardware = NO;
+    dispatch_once(&onceToken, ^{
+        SEL DeviceInfoSelector = SD_SEL_SPI(deviceInfoForKey:);
+        NSString *HEVCDecoder8bitSupported = @"N8lZxRgC7lfdRS3dRLn+Ag";
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
+        if ([UIDevice.currentDevice respondsToSelector:DeviceInfoSelector] && [UIDevice.currentDevice performSelector:DeviceInfoSelector withObject:HEVCDecoder8bitSupported]) {
+            supportsHardware = YES;
+        }
+#pragma clang diagnostic pop
+    });
+    return supportsHardware;
+}
+#endif
+
+static UIImage * _Nonnull SDImageGetAlphaDummyImage(void) {
+    static dispatch_once_t onceToken;
+    static UIImage *dummyImage;
+    dispatch_once(&onceToken, ^{
+        SDGraphicsImageRendererFormat *format = [SDGraphicsImageRendererFormat preferredFormat];
+        format.scale = 1;
+        format.opaque = NO;
+        CGSize size = CGSizeMake(1, 1);
+        SDGraphicsImageRenderer *renderer = [[SDGraphicsImageRenderer alloc] initWithSize:size format:format];
+        dummyImage = [renderer imageWithActions:^(CGContextRef  _Nonnull context) {
+            CGContextSetFillColorWithColor(context, UIColor.redColor.CGColor);
+            CGContextFillRect(context, CGRectMake(0, 0, size.width, size.height));
+        }];
+        NSCAssert(dummyImage, @"The sample alpha image (1x1 pixels) returns nil, OS bug ?");
+    });
+    return dummyImage;
+}
+
+static UIImage * _Nonnull SDImageGetNonAlphaDummyImage(void) {
+    static dispatch_once_t onceToken;
+    static UIImage *dummyImage;
+    dispatch_once(&onceToken, ^{
+        SDGraphicsImageRendererFormat *format = [SDGraphicsImageRendererFormat preferredFormat];
+        format.scale = 1;
+        format.opaque = YES;
+        CGSize size = CGSizeMake(1, 1);
+        SDGraphicsImageRenderer *renderer = [[SDGraphicsImageRenderer alloc] initWithSize:size format:format];
+        dummyImage = [renderer imageWithActions:^(CGContextRef  _Nonnull context) {
+            CGContextSetFillColorWithColor(context, UIColor.redColor.CGColor);
+            CGContextFillRect(context, CGRectMake(0, 0, size.width, size.height));
+        }];
+        NSCAssert(dummyImage, @"The sample non-alpha image (1x1 pixels) returns nil, OS bug ?");
+    });
+    return dummyImage;
+}
+
+static SDImageCoderDecodeSolution kDefaultDecodeSolution = SDImageCoderDecodeSolutionAutomatic;
+
+static const size_t kBytesPerPixel = 4;
+static const size_t kBitsPerComponent = 8;
+
+static const CGFloat kBytesPerMB = 1024.0f * 1024.0f;
+/*
+ * Defines the maximum size in MB of the decoded image when the flag `SDWebImageScaleDownLargeImages` is set
+ * Suggested value for iPad1 and iPhone 3GS: 60.
+ * Suggested value for iPad2 and iPhone 4: 120.
+ * Suggested value for iPhone 3G and iPod 2 and earlier devices: 30.
+ */
+#if SD_MAC
+static CGFloat kDestImageLimitBytes = 90.f * kBytesPerMB;
+#elif SD_UIKIT
+static CGFloat kDestImageLimitBytes = 60.f * kBytesPerMB;
+#elif SD_WATCH
+static CGFloat kDestImageLimitBytes = 30.f * kBytesPerMB;
+#endif
+
+static const CGFloat kDestSeemOverlap = 2.0f;   // the numbers of pixels to overlap the seems where tiles meet.
+
+#if SD_MAC
+@interface SDAnimatedImageRep (Private)
+/// This wrap the animated image frames for legacy animated image coder API (`encodedDataWithImage:`).
+@property (nonatomic, readwrite, weak) NSArray<SDImageFrame *> *frames;
+@end
+#endif
+
+@implementation SDImageCoderHelper
+
++ (UIImage *)animatedImageWithFrames:(NSArray<SDImageFrame *> *)frames {
+    NSUInteger frameCount = frames.count;
+    if (frameCount == 0) {
+        return nil;
+    }
+    
+    UIImage *animatedImage;
+    
+#if SD_UIKIT || SD_WATCH
+    NSUInteger durations[frameCount];
+    for (size_t i = 0; i < frameCount; i++) {
+        durations[i] = frames[i].duration * 1000;
+    }
+    NSUInteger const gcd = gcdArray(frameCount, durations);
+    __block NSTimeInterval totalDuration = 0;
+    NSMutableArray<UIImage *> *animatedImages = [NSMutableArray arrayWithCapacity:frameCount];
+    [frames enumerateObjectsUsingBlock:^(SDImageFrame * _Nonnull frame, NSUInteger idx, BOOL * _Nonnull stop) {
+        UIImage *image = frame.image;
+        NSUInteger duration = frame.duration * 1000;
+        totalDuration += frame.duration;
+        NSUInteger repeatCount;
+        if (gcd) {
+            repeatCount = duration / gcd;
+        } else {
+            repeatCount = 1;
+        }
+        for (size_t i = 0; i < repeatCount; ++i) {
+            [animatedImages addObject:image];
+        }
+    }];
+    
+    animatedImage = [UIImage animatedImageWithImages:animatedImages duration:totalDuration];
+    
+#else
+    
+    SDImageFormat format;
+    if (@available(iOS 12.0, tvOS 12.0, macOS 10.14, watchOS 5.0, *)) {
+        format = SDImageFormatPNG;
+    } else {
+        format = SDImageFormatGIF;
+    }
+    NSData *imageData;
+    if (format == SDImageFormatPNG) {
+        imageData = [SDImageAPNGCoder.sharedCoder encodedDataWithFrames:frames loopCount:0 format:format options:nil];
+    } else {
+        imageData = [SDImageGIFCoder.sharedCoder encodedDataWithFrames:frames loopCount:0 format:format options:nil];
+    }
+    if (!imageData) {
+        return nil;
+    }
+    CGFloat scale = MAX(frames.firstObject.image.scale, 1);
+    
+    SDAnimatedImageRep *imageRep = [[SDAnimatedImageRep alloc] initWithData:imageData];
+    NSSize size = NSMakeSize(imageRep.pixelsWide / scale, imageRep.pixelsHigh / scale);
+    imageRep.size = size;
+    imageRep.frames = frames; // Weak assign to avoid effect lazy semantic of NSBitmapImageRep
+    animatedImage = [[NSImage alloc] initWithSize:size];
+    [animatedImage addRepresentation:imageRep];
+#endif
+    
+    return animatedImage;
+}
+
++ (NSArray<SDImageFrame *> *)framesFromAnimatedImage:(UIImage *)animatedImage {
+    if (!animatedImage) {
+        return nil;
+    }
+    
+    NSMutableArray<SDImageFrame *> *frames;
+    NSUInteger frameCount = 0;
+    
+#if SD_UIKIT || SD_WATCH
+    NSArray<UIImage *> *animatedImages = animatedImage.images;
+    frameCount = animatedImages.count;
+    if (frameCount == 0) {
+        return nil;
+    }
+    frames = [NSMutableArray arrayWithCapacity:frameCount];
+    
+    NSTimeInterval avgDuration = animatedImage.duration / frameCount;
+    if (avgDuration == 0) {
+        avgDuration = 0.1; // if it's a animated image but no duration, set it to default 100ms (this do not have that 10ms limit like GIF or WebP to allow custom coder provide the limit)
+    }
+    
+    __block NSUInteger repeatCount = 1;
+    __block UIImage *previousImage = animatedImages.firstObject;
+    [animatedImages enumerateObjectsUsingBlock:^(UIImage * _Nonnull image, NSUInteger idx, BOOL * _Nonnull stop) {
+        // ignore first
+        if (idx == 0) {
+            return;
+        }
+        if ([image isEqual:previousImage]) {
+            repeatCount++;
+        } else {
+            SDImageFrame *frame = [SDImageFrame frameWithImage:previousImage duration:avgDuration * repeatCount];
+            [frames addObject:frame];
+            repeatCount = 1;
+        }
+        previousImage = image;
+    }];
+    // last one
+    SDImageFrame *frame = [SDImageFrame frameWithImage:previousImage duration:avgDuration * repeatCount];
+    [frames addObject:frame];
+    
+#else
+    
+    NSRect imageRect = NSMakeRect(0, 0, animatedImage.size.width, animatedImage.size.height);
+    NSImageRep *imageRep = [animatedImage bestRepresentationForRect:imageRect context:nil hints:nil];
+    // Check weak assigned frames firstly
+    if ([imageRep isKindOfClass:[SDAnimatedImageRep class]]) {
+        SDAnimatedImageRep *animatedImageRep = (SDAnimatedImageRep *)imageRep;
+        if (animatedImageRep.frames) {
+            return animatedImageRep.frames;
+        }
+    }
+    
+    NSBitmapImageRep *bitmapImageRep;
+    if ([imageRep isKindOfClass:[NSBitmapImageRep class]]) {
+        bitmapImageRep = (NSBitmapImageRep *)imageRep;
+    }
+    if (!bitmapImageRep) {
+        return nil;
+    }
+    frameCount = [[bitmapImageRep valueForProperty:NSImageFrameCount] unsignedIntegerValue];
+    if (frameCount == 0) {
+        return nil;
+    }
+    frames = [NSMutableArray arrayWithCapacity:frameCount];
+    CGFloat scale = animatedImage.scale;
+    
+    for (size_t i = 0; i < frameCount; i++) {
+        // NSBitmapImageRep need to manually change frame. "Good taste" API
+        [bitmapImageRep setProperty:NSImageCurrentFrame withValue:@(i)];
+        NSTimeInterval frameDuration = [[bitmapImageRep valueForProperty:NSImageCurrentFrameDuration] doubleValue];
+        NSImage *frameImage = [[NSImage alloc] initWithCGImage:bitmapImageRep.CGImage scale:scale orientation:kCGImagePropertyOrientationUp];
+        SDImageFrame *frame = [SDImageFrame frameWithImage:frameImage duration:frameDuration];
+        [frames addObject:frame];
+    }
+#endif
+    
+    return [frames copy];
+}
+
++ (CGColorSpaceRef)colorSpaceGetDeviceRGB {
+#if SD_MAC
+    NSScreen *mainScreen = nil;
+    if (@available(macOS 10.12, *)) {
+        mainScreen = [NSScreen mainScreen];
+    } else {
+        mainScreen = [NSScreen screens].firstObject;
+    }
+    CGColorSpaceRef colorSpace = mainScreen.colorSpace.CGColorSpace;
+    return colorSpace;
+#else
+    static CGColorSpaceRef colorSpace;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceSRGB);
+    });
+    return colorSpace;
+#endif
+}
+
++ (SDImagePixelFormat)preferredPixelFormat:(BOOL)containsAlpha {
+    CGImageRef cgImage;
+    if (containsAlpha) {
+        cgImage = SDImageGetAlphaDummyImage().CGImage;
+    } else {
+        cgImage = SDImageGetNonAlphaDummyImage().CGImage;
+    }
+    CGBitmapInfo bitmapInfo = CGImageGetBitmapInfo(cgImage);
+    size_t bitsPerComponent = 8;
+    if (SD_OPTIONS_CONTAINS(bitmapInfo, kCGBitmapFloatComponents)) {
+      bitsPerComponent = 16;
+    }
+    size_t components = 4; // Hardcode now
+    // https://github.com/path/FastImageCache#byte-alignment
+    // A properly aligned bytes-per-row value must be a multiple of 8 pixels × bytes per pixel.
+    size_t alignment = (bitsPerComponent / 8) * components * 8;
+    SDImagePixelFormat pixelFormat = {
+        .bitmapInfo = bitmapInfo,
+        .alignment = alignment
+    };
+    return pixelFormat;
+}
+
++ (BOOL)CGImageIsHardwareSupported:(CGImageRef)cgImage {
+    BOOL supported = YES;
+    // 1. Check byte alignment
+    size_t bytesPerRow = CGImageGetBytesPerRow(cgImage);
+    BOOL hasAlpha = [self CGImageContainsAlpha:cgImage];
+    SDImagePixelFormat pixelFormat = [self preferredPixelFormat:hasAlpha];
+    if (SDByteAlign(bytesPerRow, pixelFormat.alignment) == bytesPerRow) {
+        // byte aligned, OK
+        supported &= YES;
+    } else {
+        // not aligned
+        supported &= NO;
+    }
+    if (!supported) return supported;
+    
+    // 2. Check color space
+    CGColorSpaceRef colorSpace = CGImageGetColorSpace(cgImage);
+    CGColorSpaceRef perferredColorSpace = [self colorSpaceGetDeviceRGB];
+    if (colorSpace == perferredColorSpace) {
+        return supported;
+    } else {
+        if (@available(iOS 10.0, tvOS 10.0, macOS 10.6, watchOS 3.0, *)) {
+            NSString *colorspaceName = (__bridge_transfer NSString *)CGColorSpaceCopyName(colorSpace);
+            // Seems sRGB/deviceRGB always supported, P3 not always
+            if ([colorspaceName isEqualToString:(__bridge NSString *)kCGColorSpaceDeviceRGB]
+                || [colorspaceName isEqualToString:(__bridge NSString *)kCGColorSpaceSRGB]) {
+                supported &= YES;
+            } else {
+                supported &= NO;
+            }
+            return supported;
+        } else {
+            // Fallback on earlier versions
+            return supported;
+        }
+    }
+}
+
++ (BOOL)CGImageContainsAlpha:(CGImageRef)cgImage {
+    if (!cgImage) {
+        return NO;
+    }
+    CGImageAlphaInfo alphaInfo = CGImageGetAlphaInfo(cgImage);
+    BOOL hasAlpha = !(alphaInfo == kCGImageAlphaNone ||
+                      alphaInfo == kCGImageAlphaNoneSkipFirst ||
+                      alphaInfo == kCGImageAlphaNoneSkipLast);
+    return hasAlpha;
+}
+
++ (BOOL)CGImageIsLazy:(CGImageRef)cgImage {
+    if (!cgImage) {
+        return NO;
+    }
+    // CoreGraphics use CGImage's C struct filed (offset 0xd8 on iOS 17.0)
+    // But since the description of `CGImageRef` always contains the `[DP]` (DataProvider) and `[IP]` (ImageProvider), we can use this as a hint
+    NSString *description = (__bridge_transfer NSString *)CFCopyDescription(cgImage);
+    if (description) {
+        // Solution 1: Parse the description to get provider
+        // <CGImage 0x10740ffe0> (IP) -> YES
+        // <CGImage 0x10740ffe0> (DP) -> NO
+        NSArray<NSString *> *lines = [description componentsSeparatedByString:@"\n"];
+        if (lines.count > 0) {
+            NSString *firstLine = lines[0];
+            NSRange startRange = [firstLine rangeOfString:@"("];
+            NSRange endRange = [firstLine rangeOfString:@")"];
+            if (startRange.location != NSNotFound && endRange.location != NSNotFound) {
+                NSRange resultRange = NSMakeRange(startRange.location + 1, endRange.location - startRange.location - 1);
+                NSString *providerString = [firstLine substringWithRange:resultRange];
+                if ([providerString isEqualToString:@"IP"]) {
+                    return YES;
+                } else if ([providerString isEqualToString:@"DP"]) {
+                    return NO;
+                } else {
+                    // New cases ? fallback
+                }
+            }
+        }
+    }
+    // Solution 2: Use UTI metadata
+    CFStringRef uttype = CGImageGetUTType(cgImage);
+    if (uttype) {
+        // Only ImageIO can set `com.apple.ImageIO.imageSourceTypeIdentifier` metadata for lazy decoded CGImage
+        return YES;
+    } else {
+        return NO;
+    }
+}
+
++ (BOOL)CGImageIsHDR:(_Nonnull CGImageRef)cgImage {
+    if (!cgImage) {
+        return NO;
+    }
+    if (@available(macOS 11.0, iOS 14, tvOS 14, watchOS 7.0, *)) {
+        CGColorSpaceRef colorSpace = CGImageGetColorSpace(cgImage);
+        if (colorSpace) {
+            // Actually `CGColorSpaceIsHDR` use the same impl, but deprecated
+            return CGColorSpaceUsesITUR_2100TF(colorSpace);
+        }
+    }
+    return NO;
+}
+
++ (CGImageRef)CGImageCreateDecoded:(CGImageRef)cgImage {
+    return [self CGImageCreateDecoded:cgImage orientation:kCGImagePropertyOrientationUp];
+}
+
++ (CGImageRef)CGImageCreateDecoded:(CGImageRef)cgImage orientation:(CGImagePropertyOrientation)orientation {
+    if (!cgImage) {
+        return NULL;
+    }
+    size_t width = CGImageGetWidth(cgImage);
+    size_t height = CGImageGetHeight(cgImage);
+    if (width == 0 || height == 0) return NULL;
+    size_t newWidth;
+    size_t newHeight;
+    switch (orientation) {
+        case kCGImagePropertyOrientationLeft:
+        case kCGImagePropertyOrientationLeftMirrored:
+        case kCGImagePropertyOrientationRight:
+        case kCGImagePropertyOrientationRightMirrored: {
+            // These orientation should swap width & height
+            newWidth = height;
+            newHeight = width;
+        }
+            break;
+        default: {
+            newWidth = width;
+            newHeight = height;
+        }
+            break;
+    }
+    
+    BOOL hasAlpha = [self CGImageContainsAlpha:cgImage];
+    // kCGImageAlphaNone is not supported in CGBitmapContextCreate.
+    // Check #3330 for more detail about why this bitmap is choosen.
+    // From v5.17.0, use runtime detection of bitmap info instead of hardcode.
+    CGBitmapInfo bitmapInfo = [SDImageCoderHelper preferredPixelFormat:hasAlpha].bitmapInfo;
+    CGContextRef context = CGBitmapContextCreate(NULL, newWidth, newHeight, 8, 0, [self colorSpaceGetDeviceRGB], bitmapInfo);
+    if (!context) {
+        return NULL;
+    }
+    
+    // Apply transform
+    CGAffineTransform transform = SDCGContextTransformFromOrientation(orientation, CGSizeMake(newWidth, newHeight));
+    CGContextConcatCTM(context, transform);
+    CGContextDrawImage(context, CGRectMake(0, 0, width, height), cgImage); // The rect is bounding box of CGImage, don't swap width & height
+    CGImageRef newImageRef = CGBitmapContextCreateImage(context);
+    CGContextRelease(context);
+    
+    return newImageRef;
+}
+
++ (CGImageRef)CGImageCreateScaled:(CGImageRef)cgImage size:(CGSize)size {
+    if (!cgImage) {
+        return NULL;
+    }
+    if (size.width == 0 || size.height == 0) {
+        return NULL;
+    }
+    size_t width = CGImageGetWidth(cgImage);
+    size_t height = CGImageGetHeight(cgImage);
+    if (width == size.width && height == size.height) {
+        // Already same size
+        CGImageRetain(cgImage);
+        return cgImage;
+    }
+    size_t bitsPerComponent = CGImageGetBitsPerComponent(cgImage);
+    if (bitsPerComponent != 8 && bitsPerComponent != 16 && bitsPerComponent != 32) {
+        // Unsupported
+        return NULL;
+    }
+    size_t bitsPerPixel = CGImageGetBitsPerPixel(cgImage);
+    CGColorSpaceRef colorSpace = CGImageGetColorSpace(cgImage);
+    CGColorRenderingIntent renderingIntent = CGImageGetRenderingIntent(cgImage);
+    CGBitmapInfo bitmapInfo = CGImageGetBitmapInfo(cgImage);
+    CGImageAlphaInfo alphaInfo = bitmapInfo & kCGBitmapAlphaInfoMask;
+    CGImageByteOrderInfo byteOrderInfo = bitmapInfo & kCGBitmapByteOrderMask;
+    CGBitmapInfo alphaBitmapInfo = (uint32_t)byteOrderInfo;
+    
+    // Input need to convert with alpha
+    if (alphaInfo == kCGImageAlphaNone) {
+        // Convert RGB8/16/F -> ARGB8/16/F
+        alphaBitmapInfo |= kCGImageAlphaFirst;
+    } else {
+        alphaBitmapInfo |= alphaInfo;
+    }
+    uint32_t components;
+    if (alphaInfo == kCGImageAlphaOnly) {
+        // Alpha only, simple to 1 channel
+        components = 1;
+    } else {
+        components = 4;
+    }
+    if (SD_OPTIONS_CONTAINS(bitmapInfo, kCGBitmapFloatComponents)) {
+        // Keep float components
+        alphaBitmapInfo |= kCGBitmapFloatComponents;
+    }
+    __block vImage_Buffer input_buffer = {}, output_buffer = {};
+    @onExit {
+        if (input_buffer.data) free(input_buffer.data);
+        if (output_buffer.data) free(output_buffer.data);
+    };
+    // Always provide alpha channel
+    vImage_CGImageFormat format = (vImage_CGImageFormat) {
+        .bitsPerComponent = (uint32_t)bitsPerComponent,
+        .bitsPerPixel = (uint32_t)bitsPerComponent * components,
+        .colorSpace = colorSpace,
+        .bitmapInfo = alphaBitmapInfo,
+        .version = 0,
+        .decode = NULL,
+        .renderingIntent = renderingIntent
+    };
+    // input
+    vImage_Error ret = vImageBuffer_InitWithCGImage(&input_buffer, &format, NULL, cgImage, kvImageNoFlags);
+    if (ret != kvImageNoError) return NULL;
+    // output
+    vImageBuffer_Init(&output_buffer, size.height, size.width, (uint32_t)bitsPerComponent * components, kvImageNoFlags);
+    if (!output_buffer.data) return NULL;
+    
+    if (components == 4) {
+        if (bitsPerComponent == 32) {
+            ret = vImageScale_ARGBFFFF(&input_buffer, &output_buffer, NULL, kvImageHighQualityResampling);
+        } else if (bitsPerComponent == 16) {
+            ret = vImageScale_ARGB16U(&input_buffer, &output_buffer, NULL, kvImageHighQualityResampling);
+        } else if (bitsPerComponent == 8) {
+            ret = vImageScale_ARGB8888(&input_buffer, &output_buffer, NULL, kvImageHighQualityResampling);
+        }
+    } else {
+        if (bitsPerComponent == 32) {
+            ret = vImageScale_PlanarF(&input_buffer, &output_buffer, NULL, kvImageHighQualityResampling);
+        } else if (bitsPerComponent == 16) {
+            ret = vImageScale_Planar16U(&input_buffer, &output_buffer, NULL, kvImageHighQualityResampling);
+        } else if (bitsPerComponent == 8) {
+            ret = vImageScale_Planar8(&input_buffer, &output_buffer, NULL, kvImageHighQualityResampling);
+        }
+    }
+    if (ret != kvImageNoError) return NULL;
+    
+    // Convert back to non-alpha for RGB input to preserve pixel format
+    if (alphaInfo == kCGImageAlphaNone) {
+        // in-place, no extra allocation
+        if (bitsPerComponent == 32) {
+            ret = vImageConvert_ARGBFFFFtoRGBFFF(&output_buffer, &output_buffer, kvImageNoFlags);
+        } else if (bitsPerComponent == 16) {
+            ret = vImageConvert_ARGB16UtoRGB16U(&output_buffer, &output_buffer, kvImageNoFlags);
+        } else if (bitsPerComponent == 8) {
+            ret = vImageConvert_ARGB8888toRGB888(&output_buffer, &output_buffer, kvImageNoFlags);
+        }
+        if (ret != kvImageNoError) return NULL;
+    }
+    vImage_CGImageFormat output_format = (vImage_CGImageFormat) {
+        .bitsPerComponent = (uint32_t)bitsPerComponent,
+        .bitsPerPixel = (uint32_t)bitsPerPixel,
+        .colorSpace = colorSpace,
+        .bitmapInfo = bitmapInfo,
+        .version = 0,
+        .decode = NULL,
+        .renderingIntent = renderingIntent
+    };
+    CGImageRef outputImage = vImageCreateCGImageFromBuffer(&output_buffer, &output_format, NULL, NULL, kvImageNoFlags, &ret);
+    if (ret != kvImageNoError) {
+        CGImageRelease(outputImage);
+        return NULL;
+    }
+    
+    return outputImage;
+}
+
++ (CGSize)scaledSizeWithImageSize:(CGSize)imageSize scaleSize:(CGSize)scaleSize preserveAspectRatio:(BOOL)preserveAspectRatio shouldScaleUp:(BOOL)shouldScaleUp {
+    CGFloat width = imageSize.width;
+    CGFloat height = imageSize.height;
+    CGFloat resultWidth;
+    CGFloat resultHeight;
+    
+    if (width <= 0 || height <= 0 || scaleSize.width <= 0 || scaleSize.height <= 0) {
+        // Protect
+        resultWidth = width;
+        resultHeight = height;
+    } else {
+        // Scale to fit
+        if (preserveAspectRatio) {
+            CGFloat pixelRatio = width / height;
+            CGFloat scaleRatio = scaleSize.width / scaleSize.height;
+            if (pixelRatio > scaleRatio) {
+                resultWidth = scaleSize.width;
+                resultHeight = ceil(scaleSize.width / pixelRatio);
+            } else {
+                resultHeight = scaleSize.height;
+                resultWidth = ceil(scaleSize.height * pixelRatio);
+            }
+        } else {
+            // Stretch
+            resultWidth = scaleSize.width;
+            resultHeight = scaleSize.height;
+        }
+        if (!shouldScaleUp) {
+            // Scale down only
+            resultWidth = MIN(width, resultWidth);
+            resultHeight = MIN(height, resultHeight);
+        }
+    }
+    
+    return CGSizeMake(resultWidth, resultHeight);
+}
+
++ (CGSize)scaledSizeWithImageSize:(CGSize)imageSize limitBytes:(NSUInteger)limitBytes bytesPerPixel:(NSUInteger)bytesPerPixel frameCount:(NSUInteger)frameCount {
+    if (CGSizeEqualToSize(imageSize, CGSizeZero)) return CGSizeMake(1, 1);
+    NSUInteger totalFramePixelSize = limitBytes / bytesPerPixel / (frameCount ?: 1);
+    CGFloat ratio = imageSize.height / imageSize.width;
+    CGFloat width = sqrt(totalFramePixelSize / ratio);
+    CGFloat height = width * ratio;
+    width = MAX(1, floor(width));
+    height = MAX(1, floor(height));
+    CGSize size = CGSizeMake(width, height);
+    
+    return size;
+}
+
++ (UIImage *)decodedImageWithImage:(UIImage *)image {
+    return [self decodedImageWithImage:image policy:SDImageForceDecodePolicyAutomatic];
+}
+
++ (UIImage *)decodedImageWithImage:(UIImage *)image policy:(SDImageForceDecodePolicy)policy {
+    if (![self shouldDecodeImage:image policy:policy]) {
+        return image;
+    }
+    
+    UIImage *decodedImage;
+    SDImageCoderDecodeSolution decodeSolution = self.defaultDecodeSolution;
+#if SD_UIKIT
+    if (decodeSolution == SDImageCoderDecodeSolutionAutomatic) {
+        // See #3365, CMPhoto iOS 15 only supports JPEG/HEIF format, or it will print an error log :(
+        SDImageFormat format = image.sd_imageFormat;
+        if ((format == SDImageFormatHEIC || format == SDImageFormatHEIF) && SDImageSupportsHardwareHEVCDecoder()) {
+            decodedImage = SDImageDecodeUIKit(image);
+        } else if (format == SDImageFormatJPEG) {
+            decodedImage = SDImageDecodeUIKit(image);
+        }
+    } else if (decodeSolution == SDImageCoderDecodeSolutionUIKit) {
+        // Arbitrarily call CMPhoto
+        decodedImage = SDImageDecodeUIKit(image);
+    }
+    if (decodedImage) {
+        return decodedImage;
+    }
+#endif
+    
+    CGImageRef imageRef = image.CGImage;
+    if (!imageRef) {
+        // Only decode for CGImage-based
+        return image;
+    }
+    
+    if (decodeSolution == SDImageCoderDecodeSolutionCoreGraphics) {
+        CGImageRef decodedImageRef = [self CGImageCreateDecoded:imageRef];
+#if SD_MAC
+        decodedImage = [[UIImage alloc] initWithCGImage:decodedImageRef scale:image.scale orientation:kCGImagePropertyOrientationUp];
+#else
+        decodedImage = [[UIImage alloc] initWithCGImage:decodedImageRef scale:image.scale orientation:image.imageOrientation];
+#endif
+        CGImageRelease(decodedImageRef);
+    } else {
+        // Prefer to use new Image Renderer to re-draw image, instead of low-level CGBitmapContext and CGContextDrawImage
+        // This can keep both OS compatible and don't fight with Apple's performance optimization
+        SDGraphicsImageRendererFormat *format = SDGraphicsImageRendererFormat.preferredFormat;
+        // To support most OS compatible like Dynamic Range, prefer the image level format
+#if SD_UIKIT
+        if (@available(iOS 10.0, tvOS 10.0, *)) {
+            format.uiformat = image.imageRendererFormat;
+        } else {
+#endif
+            format.opaque = ![self CGImageContainsAlpha:imageRef];;
+            format.scale = image.scale;
+#if SD_UIKIT
+        }
+#endif
+        CGSize imageSize = image.size;
+        SDGraphicsImageRenderer *renderer = [[SDGraphicsImageRenderer alloc] initWithSize:imageSize format:format];
+        decodedImage = [renderer imageWithActions:^(CGContextRef  _Nonnull context) {
+                [image drawInRect:CGRectMake(0, 0, imageSize.width, imageSize.height)];
+        }];
+    }
+    SDImageCopyAssociatedObject(image, decodedImage);
+    decodedImage.sd_isDecoded = YES;
+    return decodedImage;
+}
+
++ (UIImage *)decodedAndScaledDownImageWithImage:(UIImage *)image limitBytes:(NSUInteger)bytes {
+    return [self decodedAndScaledDownImageWithImage:image limitBytes:bytes policy:SDImageForceDecodePolicyAutomatic];
+}
+
++ (UIImage *)decodedAndScaledDownImageWithImage:(UIImage *)image limitBytes:(NSUInteger)bytes policy:(SDImageForceDecodePolicy)policy {
+    if (![self shouldDecodeImage:image policy:policy]) {
+        return image;
+    }
+    
+    CGFloat destTotalPixels;
+    CGFloat tileTotalPixels;
+    if (bytes == 0) {
+        bytes = [self defaultScaleDownLimitBytes];
+    }
+    bytes = MAX(bytes, kBytesPerPixel);
+    destTotalPixels = bytes / kBytesPerPixel;
+    tileTotalPixels = destTotalPixels / 3;
+    
+    CGImageRef sourceImageRef = image.CGImage;
+    if (!sourceImageRef) {
+        // Only decode for CGImage-based
+        return image;
+    }
+    CGSize sourceResolution = CGSizeZero;
+    sourceResolution.width = CGImageGetWidth(sourceImageRef);
+    sourceResolution.height = CGImageGetHeight(sourceImageRef);
+    
+    if (![self shouldScaleDownImagePixelSize:sourceResolution limitBytes:bytes]) {
+        return [self decodedImageWithImage:image];
+    }
+    
+    CGFloat sourceTotalPixels = sourceResolution.width * sourceResolution.height;
+    // Determine the scale ratio to apply to the input image
+    // that results in an output image of the defined size.
+    // see kDestImageSizeMB, and how it relates to destTotalPixels.
+    CGFloat imageScale = sqrt(destTotalPixels / sourceTotalPixels);
+    CGSize destResolution = CGSizeZero;
+    destResolution.width = MAX(1, (int)(sourceResolution.width * imageScale));
+    destResolution.height = MAX(1, (int)(sourceResolution.height * imageScale));
+    
+    UIImage *decodedImage;
+#if SD_UIKIT
+    SDImageCoderDecodeSolution decodeSolution = self.defaultDecodeSolution;
+    if (decodeSolution == SDImageCoderDecodeSolutionAutomatic) {
+        // See #3365, CMPhoto iOS 15 only supports JPEG/HEIF format, or it will print an error log :(
+        SDImageFormat format = image.sd_imageFormat;
+        if ((format == SDImageFormatHEIC || format == SDImageFormatHEIF) && SDImageSupportsHardwareHEVCDecoder()) {
+            decodedImage = SDImageDecodeAndScaleDownUIKit(image, destResolution);
+        } else if (format == SDImageFormatJPEG) {
+            decodedImage = SDImageDecodeAndScaleDownUIKit(image, destResolution);
+        }
+    } else if (decodeSolution == SDImageCoderDecodeSolutionUIKit) {
+        // Arbitrarily call CMPhoto
+        decodedImage = SDImageDecodeAndScaleDownUIKit(image, destResolution);
+    }
+    if (decodedImage) {
+        return decodedImage;
+    }
+#endif
+    
+    // autorelease the bitmap context and all vars to help system to free memory when there are memory warning.
+    // on iOS7, do not forget to call [[SDImageCache sharedImageCache] clearMemory];
+    @autoreleasepool {
+        // device color space
+        CGColorSpaceRef colorspaceRef = [self colorSpaceGetDeviceRGB];
+        BOOL hasAlpha = [self CGImageContainsAlpha:sourceImageRef];
+        
+        // kCGImageAlphaNone is not supported in CGBitmapContextCreate.
+        // Check #3330 for more detail about why this bitmap is choosen.
+        // From v5.17.0, use runtime detection of bitmap info instead of hardcode.
+        CGBitmapInfo bitmapInfo = [SDImageCoderHelper preferredPixelFormat:hasAlpha].bitmapInfo;
+        CGContextRef destContext = CGBitmapContextCreate(NULL,
+                                                         destResolution.width,
+                                                         destResolution.height,
+                                                         kBitsPerComponent,
+                                                         0,
+                                                         colorspaceRef,
+                                                         bitmapInfo);
+        
+        if (destContext == NULL) {
+            return image;
+        }
+        CGContextSetInterpolationQuality(destContext, kCGInterpolationHigh);
+        
+        // Now define the size of the rectangle to be used for the
+        // incremental bits from the input image to the output image.
+        // we use a source tile width equal to the width of the source
+        // image due to the way that iOS retrieves image data from disk.
+        // iOS must decode an image from disk in full width 'bands', even
+        // if current graphics context is clipped to a subrect within that
+        // band. Therefore we fully utilize all of the pixel data that results
+        // from a decoding operation by anchoring our tile size to the full
+        // width of the input image.
+        CGRect sourceTile = CGRectZero;
+        sourceTile.size.width = sourceResolution.width;
+        // The source tile height is dynamic. Since we specified the size
+        // of the source tile in MB, see how many rows of pixels high it
+        // can be given the input image width.
+        sourceTile.size.height = MAX(1, (int)(tileTotalPixels / sourceTile.size.width));
+        sourceTile.origin.x = 0.0f;
+        // The output tile is the same proportions as the input tile, but
+        // scaled to image scale.
+        CGRect destTile;
+        destTile.size.width = destResolution.width;
+        destTile.size.height = sourceTile.size.height * imageScale;
+        destTile.origin.x = 0.0f;
+        // The source seem overlap is proportionate to the destination seem overlap.
+        // this is the amount of pixels to overlap each tile as we assemble the output image.
+        float sourceSeemOverlap = (int)((kDestSeemOverlap/destResolution.height)*sourceResolution.height);
+        CGImageRef sourceTileImageRef;
+        // calculate the number of read/write operations required to assemble the
+        // output image.
+        int iterations = (int)( sourceResolution.height / sourceTile.size.height );
+        // If tile height doesn't divide the image height evenly, add another iteration
+        // to account for the remaining pixels.
+        int remainder = (int)sourceResolution.height % (int)sourceTile.size.height;
+        if(remainder) {
+            iterations++;
+        }
+        // Add seem overlaps to the tiles, but save the original tile height for y coordinate calculations.
+        float sourceTileHeightMinusOverlap = sourceTile.size.height;
+        sourceTile.size.height += sourceSeemOverlap;
+        destTile.size.height += kDestSeemOverlap;
+        for( int y = 0; y < iterations; ++y ) {
+            sourceTile.origin.y = y * sourceTileHeightMinusOverlap + sourceSeemOverlap;
+            destTile.origin.y = destResolution.height - (( y + 1 ) * sourceTileHeightMinusOverlap * imageScale + kDestSeemOverlap);
+            sourceTileImageRef = CGImageCreateWithImageInRect( sourceImageRef, sourceTile );
+            if( y == iterations - 1 && remainder ) {
+                float dify = destTile.size.height;
+                destTile.size.height = CGImageGetHeight( sourceTileImageRef ) * imageScale + kDestSeemOverlap;
+                dify -= destTile.size.height;
+                destTile.origin.y = MIN(0, destTile.origin.y + dify);
+            }
+            CGContextDrawImage( destContext, destTile, sourceTileImageRef );
+            CGImageRelease( sourceTileImageRef );
+        }
+        
+        CGImageRef destImageRef = CGBitmapContextCreateImage(destContext);
+        CGContextRelease(destContext);
+        if (destImageRef == NULL) {
+            return image;
+        }
+#if SD_MAC
+        decodedImage = [[UIImage alloc] initWithCGImage:destImageRef scale:image.scale orientation:kCGImagePropertyOrientationUp];
+#else
+        decodedImage = [[UIImage alloc] initWithCGImage:destImageRef scale:image.scale orientation:image.imageOrientation];
+#endif
+        CGImageRelease(destImageRef);
+        SDImageCopyAssociatedObject(image, decodedImage);
+        decodedImage.sd_isDecoded = YES;
+        return decodedImage;
+    }
+}
+
++ (SDImageCoderDecodeSolution)defaultDecodeSolution {
+    return kDefaultDecodeSolution;
+}
+
++ (void)setDefaultDecodeSolution:(SDImageCoderDecodeSolution)defaultDecodeSolution {
+    kDefaultDecodeSolution = defaultDecodeSolution;
+}
+
++ (NSUInteger)defaultScaleDownLimitBytes {
+    return kDestImageLimitBytes;
+}
+
++ (void)setDefaultScaleDownLimitBytes:(NSUInteger)defaultScaleDownLimitBytes {
+    if (defaultScaleDownLimitBytes < kBytesPerPixel) {
+        return;
+    }
+    kDestImageLimitBytes = defaultScaleDownLimitBytes;
+}
+
+#if SD_UIKIT || SD_WATCH
+// Convert an EXIF image orientation to an iOS one.
++ (UIImageOrientation)imageOrientationFromEXIFOrientation:(CGImagePropertyOrientation)exifOrientation {
+    UIImageOrientation imageOrientation = UIImageOrientationUp;
+    switch (exifOrientation) {
+        case kCGImagePropertyOrientationUp:
+            imageOrientation = UIImageOrientationUp;
+            break;
+        case kCGImagePropertyOrientationDown:
+            imageOrientation = UIImageOrientationDown;
+            break;
+        case kCGImagePropertyOrientationLeft:
+            imageOrientation = UIImageOrientationLeft;
+            break;
+        case kCGImagePropertyOrientationRight:
+            imageOrientation = UIImageOrientationRight;
+            break;
+        case kCGImagePropertyOrientationUpMirrored:
+            imageOrientation = UIImageOrientationUpMirrored;
+            break;
+        case kCGImagePropertyOrientationDownMirrored:
+            imageOrientation = UIImageOrientationDownMirrored;
+            break;
+        case kCGImagePropertyOrientationLeftMirrored:
+            imageOrientation = UIImageOrientationLeftMirrored;
+            break;
+        case kCGImagePropertyOrientationRightMirrored:
+            imageOrientation = UIImageOrientationRightMirrored;
+            break;
+        default:
+            break;
+    }
+    return imageOrientation;
+}
+
+// Convert an iOS orientation to an EXIF image orientation.
++ (CGImagePropertyOrientation)exifOrientationFromImageOrientation:(UIImageOrientation)imageOrientation {
+    CGImagePropertyOrientation exifOrientation = kCGImagePropertyOrientationUp;
+    switch (imageOrientation) {
+        case UIImageOrientationUp:
+            exifOrientation = kCGImagePropertyOrientationUp;
+            break;
+        case UIImageOrientationDown:
+            exifOrientation = kCGImagePropertyOrientationDown;
+            break;
+        case UIImageOrientationLeft:
+            exifOrientation = kCGImagePropertyOrientationLeft;
+            break;
+        case UIImageOrientationRight:
+            exifOrientation = kCGImagePropertyOrientationRight;
+            break;
+        case UIImageOrientationUpMirrored:
+            exifOrientation = kCGImagePropertyOrientationUpMirrored;
+            break;
+        case UIImageOrientationDownMirrored:
+            exifOrientation = kCGImagePropertyOrientationDownMirrored;
+            break;
+        case UIImageOrientationLeftMirrored:
+            exifOrientation = kCGImagePropertyOrientationLeftMirrored;
+            break;
+        case UIImageOrientationRightMirrored:
+            exifOrientation = kCGImagePropertyOrientationRightMirrored;
+            break;
+        default:
+            break;
+    }
+    return exifOrientation;
+}
+#endif
+
+#pragma mark - Helper Function
++ (BOOL)shouldDecodeImage:(nullable UIImage *)image policy:(SDImageForceDecodePolicy)policy {
+    // Prevent "CGBitmapContextCreateImage: invalid context 0x0" error
+    if (image == nil) {
+        return NO;
+    }
+    // Check policy (never)
+    if (policy == SDImageForceDecodePolicyNever) {
+        return NO;
+    }
+    // Avoid extra decode
+    if (image.sd_isDecoded) {
+        return NO;
+    }
+    // do not decode animated images
+    if (image.sd_isAnimated) {
+        return NO;
+    }
+    // do not decode vector images
+    if (image.sd_isVector) {
+        return NO;
+    }
+    // FIXME: currently our force decode solution is buggy on HDR CGImage
+    if (image.sd_isHighDynamicRange) {
+        return NO;
+    }
+    // Check policy (always)
+    if (policy == SDImageForceDecodePolicyAlways) {
+        return YES;
+    } else {
+        // Check policy (automatic)
+        CGImageRef cgImage = image.CGImage;
+        if (cgImage) {
+            // Check if it's lazy CGImage wrapper or not
+            BOOL isLazy = [SDImageCoderHelper CGImageIsLazy:cgImage];
+            if (isLazy) {
+                // Lazy CGImage should trigger force decode before rendering
+                return YES;
+            } else {
+                // Now, let's check if this non-lazy CGImage is hardware supported (not byte-aligned will cause extra copy)
+                BOOL isSupported = [SDImageCoderHelper CGImageIsHardwareSupported:cgImage];
+                return !isSupported;
+            }
+        }
+    }
+
+    return YES;
+}
+
++ (BOOL)shouldScaleDownImagePixelSize:(CGSize)sourceResolution limitBytes:(NSUInteger)bytes {
+    BOOL shouldScaleDown = YES;
+    
+    CGFloat sourceTotalPixels = sourceResolution.width * sourceResolution.height;
+    if (sourceTotalPixels <= 0) {
+        return NO;
+    }
+    CGFloat destTotalPixels;
+    if (bytes == 0) {
+        bytes = [self defaultScaleDownLimitBytes];
+    }
+    bytes = MAX(bytes, kBytesPerPixel);
+    destTotalPixels = bytes / kBytesPerPixel;
+    CGFloat imageScale = destTotalPixels / sourceTotalPixels;
+    if (imageScale < 1) {
+        shouldScaleDown = YES;
+    } else {
+        shouldScaleDown = NO;
+    }
+    
+    return shouldScaleDown;
+}
+
+static inline CGAffineTransform SDCGContextTransformFromOrientation(CGImagePropertyOrientation orientation, CGSize size) {
+    // Inspiration from @libfeihu
+    // We need to calculate the proper transformation to make the image upright.
+    // We do it in 2 steps: Rotate if Left/Right/Down, and then flip if Mirrored.
+    CGAffineTransform transform = CGAffineTransformIdentity;
+    
+    switch (orientation) {
+        case kCGImagePropertyOrientationDown:
+        case kCGImagePropertyOrientationDownMirrored:
+            transform = CGAffineTransformTranslate(transform, size.width, size.height);
+            transform = CGAffineTransformRotate(transform, M_PI);
+            break;
+            
+        case kCGImagePropertyOrientationLeft:
+        case kCGImagePropertyOrientationLeftMirrored:
+            transform = CGAffineTransformTranslate(transform, size.width, 0);
+            transform = CGAffineTransformRotate(transform, M_PI_2);
+            break;
+            
+        case kCGImagePropertyOrientationRight:
+        case kCGImagePropertyOrientationRightMirrored:
+            transform = CGAffineTransformTranslate(transform, 0, size.height);
+            transform = CGAffineTransformRotate(transform, -M_PI_2);
+            break;
+        case kCGImagePropertyOrientationUp:
+        case kCGImagePropertyOrientationUpMirrored:
+            break;
+    }
+    
+    switch (orientation) {
+        case kCGImagePropertyOrientationUpMirrored:
+        case kCGImagePropertyOrientationDownMirrored:
+            transform = CGAffineTransformTranslate(transform, size.width, 0);
+            transform = CGAffineTransformScale(transform, -1, 1);
+            break;
+            
+        case kCGImagePropertyOrientationLeftMirrored:
+        case kCGImagePropertyOrientationRightMirrored:
+            transform = CGAffineTransformTranslate(transform, size.height, 0);
+            transform = CGAffineTransformScale(transform, -1, 1);
+            break;
+        case kCGImagePropertyOrientationUp:
+        case kCGImagePropertyOrientationDown:
+        case kCGImagePropertyOrientationLeft:
+        case kCGImagePropertyOrientationRight:
+            break;
+    }
+    
+    return transform;
+}
+
+#if SD_UIKIT || SD_WATCH
+static NSUInteger gcd(NSUInteger a, NSUInteger b) {
+    NSUInteger c;
+    while (a != 0) {
+        c = a;
+        a = b % a;
+        b = c;
+    }
+    return b;
+}
+
+static NSUInteger gcdArray(size_t const count, NSUInteger const * const values) {
+    if (count == 0) {
+        return 0;
+    }
+    NSUInteger result = values[0];
+    for (size_t i = 1; i < count; ++i) {
+        result = gcd(values[i], result);
+    }
+    return result;
+}
+#endif
+
+@end
diff --git a/SDWebImage/SDWebImageCodersManager.h b/SDWebImage/Core/SDImageCodersManager.h
similarity index 65%
rename from SDWebImage/SDWebImageCodersManager.h
rename to SDWebImage/Core/SDImageCodersManager.h
index ca687483d..14b655da8 100644
--- a/SDWebImage/SDWebImageCodersManager.h
+++ b/SDWebImage/Core/SDImageCodersManager.h
@@ -7,7 +7,7 @@
  */
 
 #import <Foundation/Foundation.h>
-#import "SDWebImageCoder.h"
+#import "SDImageCoder.h"
 
 /**
  Global object holding the array of coders, so that we avoid passing them from object to object.
@@ -17,42 +17,42 @@
  
  Note: the `coders` getter will return the coders in their reversed order
  Example:
- - by default we internally set coders = `IOCoder`, `WebPCoder`. (`GIFCoder` is not recommended to add only if you want to get GIF support without `FLAnimatedImage`)
- - calling `coders` will return `@[WebPCoder, IOCoder]`
+ - by default we internally set coders = `IOCoder`, `GIFCoder`, `APNGCoder`
+ - calling `coders` will return `@[IOCoder, GIFCoder, APNGCoder]`
  - call `[addCoder:[MyCrazyCoder new]]`
- - calling `coders` now returns `@[MyCrazyCoder, WebPCoder, IOCoder]`
+ - calling `coders` now returns `@[IOCoder, GIFCoder, APNGCoder, MyCrazyCoder]`
  
  Coders
  ------
- A coder must conform to the `SDWebImageCoder` protocol or even to `SDWebImageProgressiveCoder` if it supports progressive decoding
+ A coder must conform to the `SDImageCoder` protocol or even to `SDProgressiveImageCoder` if it supports progressive decoding
  Conformance is important because that way, they will implement `canDecodeFromData` or `canEncodeToFormat`
  Those methods are called on each coder in the array (using the priority order) until one of them returns YES.
  That means that coder can decode that data / encode to that format
  */
-@interface SDWebImageCodersManager : NSObject<SDWebImageCoder>
+@interface SDImageCodersManager : NSObject <SDImageCoder>
 
 /**
- Shared reusable instance
+ Returns the global shared coders manager instance.
  */
-+ (nonnull instancetype)sharedInstance;
+@property (nonatomic, class, readonly, nonnull) SDImageCodersManager *sharedManager;
 
 /**
  All coders in coders manager. The coders array is a priority queue, which means the later added coder will have the highest priority
  */
-@property (nonatomic, copy, readwrite, nullable) NSArray<id<SDWebImageCoder>> *coders;
+@property (nonatomic, copy, nullable) NSArray<id<SDImageCoder>> *coders;
 
 /**
  Add a new coder to the end of coders array. Which has the highest priority.
 
  @param coder coder
  */
-- (void)addCoder:(nonnull id<SDWebImageCoder>)coder;
+- (void)addCoder:(nonnull id<SDImageCoder>)coder;
 
 /**
  Remove a coder in the coders array.
 
  @param coder coder
  */
-- (void)removeCoder:(nonnull id<SDWebImageCoder>)coder;
+- (void)removeCoder:(nonnull id<SDImageCoder>)coder;
 
 @end
diff --git a/SDWebImage/Core/SDImageCodersManager.m b/SDWebImage/Core/SDImageCodersManager.m
new file mode 100644
index 000000000..0abb962ec
--- /dev/null
+++ b/SDWebImage/Core/SDImageCodersManager.m
@@ -0,0 +1,145 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDImageCodersManager.h"
+#import "SDImageIOCoder.h"
+#import "SDImageGIFCoder.h"
+#import "SDImageAPNGCoder.h"
+#import "SDImageHEICCoder.h"
+#import "SDInternalMacros.h"
+
+@interface SDImageCodersManager ()
+
+@property (nonatomic, strong, nonnull) NSMutableArray<id<SDImageCoder>> *imageCoders;
+
+@end
+
+@implementation SDImageCodersManager {
+    SD_LOCK_DECLARE(_codersLock);
+}
+
++ (nonnull instancetype)sharedManager {
+    static dispatch_once_t once;
+    static id instance;
+    dispatch_once(&once, ^{
+        instance = [self new];
+    });
+    return instance;
+}
+
+- (instancetype)init {
+    if (self = [super init]) {
+        // initialize with default coders
+        _imageCoders = [NSMutableArray arrayWithArray:@[[SDImageIOCoder sharedCoder], [SDImageGIFCoder sharedCoder], [SDImageAPNGCoder sharedCoder]]];
+        SD_LOCK_INIT(_codersLock);
+    }
+    return self;
+}
+
+- (NSArray<id<SDImageCoder>> *)coders {
+    SD_LOCK(_codersLock);
+    NSArray<id<SDImageCoder>> *coders = [_imageCoders copy];
+    SD_UNLOCK(_codersLock);
+    return coders;
+}
+
+- (void)setCoders:(NSArray<id<SDImageCoder>> *)coders {
+    SD_LOCK(_codersLock);
+    [_imageCoders removeAllObjects];
+    if (coders.count) {
+        [_imageCoders addObjectsFromArray:coders];
+    }
+    SD_UNLOCK(_codersLock);
+}
+
+#pragma mark - Coder IO operations
+
+- (void)addCoder:(nonnull id<SDImageCoder>)coder {
+    if (![coder conformsToProtocol:@protocol(SDImageCoder)]) {
+        return;
+    }
+    SD_LOCK(_codersLock);
+    [_imageCoders addObject:coder];
+    SD_UNLOCK(_codersLock);
+}
+
+- (void)removeCoder:(nonnull id<SDImageCoder>)coder {
+    if (![coder conformsToProtocol:@protocol(SDImageCoder)]) {
+        return;
+    }
+    SD_LOCK(_codersLock);
+    [_imageCoders removeObject:coder];
+    SD_UNLOCK(_codersLock);
+}
+
+#pragma mark - SDImageCoder
+- (BOOL)canDecodeFromData:(NSData *)data {
+    NSArray<id<SDImageCoder>> *coders = self.coders;
+    for (id<SDImageCoder> coder in coders.reverseObjectEnumerator) {
+        if ([coder canDecodeFromData:data]) {
+            return YES;
+        }
+    }
+    return NO;
+}
+
+- (BOOL)canEncodeToFormat:(SDImageFormat)format {
+    NSArray<id<SDImageCoder>> *coders = self.coders;
+    for (id<SDImageCoder> coder in coders.reverseObjectEnumerator) {
+        if ([coder canEncodeToFormat:format]) {
+            return YES;
+        }
+    }
+    return NO;
+}
+
+- (UIImage *)decodedImageWithData:(NSData *)data options:(nullable SDImageCoderOptions *)options {
+    if (!data) {
+        return nil;
+    }
+    UIImage *image;
+    NSArray<id<SDImageCoder>> *coders = self.coders;
+    for (id<SDImageCoder> coder in coders.reverseObjectEnumerator) {
+        if ([coder canDecodeFromData:data]) {
+            image = [coder decodedImageWithData:data options:options];
+            break;
+        }
+    }
+    
+    return image;
+}
+
+- (NSData *)encodedDataWithImage:(UIImage *)image format:(SDImageFormat)format options:(nullable SDImageCoderOptions *)options {
+    if (!image) {
+        return nil;
+    }
+    NSArray<id<SDImageCoder>> *coders = self.coders;
+    for (id<SDImageCoder> coder in coders.reverseObjectEnumerator) {
+        if ([coder canEncodeToFormat:format]) {
+            return [coder encodedDataWithImage:image format:format options:options];
+        }
+    }
+    return nil;
+}
+
+- (NSData *)encodedDataWithFrames:(NSArray<SDImageFrame *> *)frames loopCount:(NSUInteger)loopCount format:(SDImageFormat)format options:(SDImageCoderOptions *)options {
+    if (!frames || frames.count < 1) {
+        return nil;
+    }
+    NSArray<id<SDImageCoder>> *coders = self.coders;
+    for (id<SDImageCoder> coder in coders.reverseObjectEnumerator) {
+        if ([coder canEncodeToFormat:format]) {
+            if ([coder respondsToSelector:@selector(encodedDataWithFrames:loopCount:format:options:)]) {
+                return [coder encodedDataWithFrames:frames loopCount:loopCount format:format options:options];
+            }
+        }
+    }
+    return nil;
+}
+
+@end
diff --git a/SDWebImage/SDWebImageFrame.h b/SDWebImage/Core/SDImageFrame.h
similarity index 53%
rename from SDWebImage/SDWebImageFrame.h
rename to SDWebImage/Core/SDImageFrame.h
index c3a0f7122..41f396552 100644
--- a/SDWebImage/SDWebImageFrame.h
+++ b/SDWebImage/Core/SDImageFrame.h
@@ -9,9 +9,11 @@
 #import <Foundation/Foundation.h>
 #import "SDWebImageCompat.h"
 
-@interface SDWebImageFrame : NSObject
-
-// This class is used for creating animated images via `animatedImageWithFrames` in `SDWebImageCoderHelper`. Attention if you need to specify animated images loop count, use `sd_imageLoopCount` property in `UIImage+MultiFormat`.
+/**
+ This class is used for creating animated images via `animatedImageWithFrames` in `SDImageCoderHelper`.
+ @note If you need to specify animated images loop count, use `sd_imageLoopCount` property in `UIImage+Metadata.h`.
+ */
+@interface SDImageFrame : NSObject
 
 /**
  The image of current frame. You should not set an animated image.
@@ -22,6 +24,11 @@
  */
 @property (nonatomic, readonly, assign) NSTimeInterval duration;
 
+/// Create a frame instance with specify image and duration
+/// @param image current frame's image
+/// @param duration current frame's duration
+- (nonnull instancetype)initWithImage:(nonnull UIImage *)image duration:(NSTimeInterval)duration;
+
 /**
  Create a frame instance with specify image and duration
 
@@ -29,6 +36,9 @@
  @param duration current frame's duration
  @return frame instance
  */
-+ (instancetype _Nonnull)frameWithImage:(UIImage * _Nonnull)image duration:(NSTimeInterval)duration;
++ (nonnull instancetype)frameWithImage:(nonnull UIImage *)image duration:(NSTimeInterval)duration;
+
+- (nonnull instancetype)init NS_UNAVAILABLE;
++ (nonnull instancetype)new  NS_UNAVAILABLE;
 
 @end
diff --git a/SDWebImage/SDWebImageFrame.m b/SDWebImage/Core/SDImageFrame.m
similarity index 56%
rename from SDWebImage/SDWebImageFrame.m
rename to SDWebImage/Core/SDImageFrame.m
index b0aefe54e..bd207aee4 100644
--- a/SDWebImage/SDWebImageFrame.m
+++ b/SDWebImage/Core/SDImageFrame.m
@@ -6,22 +6,28 @@
  * file that was distributed with this source code.
  */
 
-#import "SDWebImageFrame.h"
+#import "SDImageFrame.h"
 
-@interface SDWebImageFrame ()
+@interface SDImageFrame ()
 
 @property (nonatomic, strong, readwrite, nonnull) UIImage *image;
 @property (nonatomic, readwrite, assign) NSTimeInterval duration;
 
 @end
 
-@implementation SDWebImageFrame
+@implementation SDImageFrame
+
+- (instancetype)initWithImage:(UIImage *)image duration:(NSTimeInterval)duration {
+    self = [super init];
+    if (self) {
+        _image = image;
+        _duration = duration;
+    }
+    return self;
+}
 
 + (instancetype)frameWithImage:(UIImage *)image duration:(NSTimeInterval)duration {
-    SDWebImageFrame *frame = [[SDWebImageFrame alloc] init];
-    frame.image = image;
-    frame.duration = duration;
-    
+    SDImageFrame *frame = [[SDImageFrame alloc] initWithImage:image duration:duration];
     return frame;
 }
 
diff --git a/SDWebImage/Core/SDImageGIFCoder.h b/SDWebImage/Core/SDImageGIFCoder.h
new file mode 100644
index 000000000..5ef67acda
--- /dev/null
+++ b/SDWebImage/Core/SDImageGIFCoder.h
@@ -0,0 +1,22 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDImageIOAnimatedCoder.h"
+
+/**
+ Built in coder using ImageIO that supports animated GIF encoding/decoding
+ @note `SDImageIOCoder` supports GIF but only as static (will use the 1st frame).
+ @note Use `SDImageGIFCoder` for fully animated GIFs. For `UIImageView`, it will produce animated `UIImage`(`NSImage` on macOS) for rendering. For `SDAnimatedImageView`, it will use `SDAnimatedImage` for rendering.
+ @note The recommended approach for animated GIFs is using `SDAnimatedImage` with `SDAnimatedImageView`. It's more performant than `UIImageView` for GIF displaying(especially on memory usage)
+ */
+@interface SDImageGIFCoder : SDImageIOAnimatedCoder <SDProgressiveImageCoder, SDAnimatedImageCoder>
+
+@property (nonatomic, class, readonly, nonnull) SDImageGIFCoder *sharedCoder;
+
+@end
diff --git a/SDWebImage/Core/SDImageGIFCoder.m b/SDWebImage/Core/SDImageGIFCoder.m
new file mode 100644
index 000000000..a1838b168
--- /dev/null
+++ b/SDWebImage/Core/SDImageGIFCoder.m
@@ -0,0 +1,58 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDImageGIFCoder.h"
+#import "SDImageIOAnimatedCoderInternal.h"
+#if SD_MAC
+#import <CoreServices/CoreServices.h>
+#else
+#import <MobileCoreServices/MobileCoreServices.h>
+#endif
+
+@implementation SDImageGIFCoder
+
++ (instancetype)sharedCoder {
+    static SDImageGIFCoder *coder;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        coder = [[SDImageGIFCoder alloc] init];
+    });
+    return coder;
+}
+
+#pragma mark - Subclass Override
+
++ (SDImageFormat)imageFormat {
+    return SDImageFormatGIF;
+}
+
++ (NSString *)imageUTType {
+    return (__bridge NSString *)kSDUTTypeGIF;
+}
+
++ (NSString *)dictionaryProperty {
+    return (__bridge NSString *)kCGImagePropertyGIFDictionary;
+}
+
++ (NSString *)unclampedDelayTimeProperty {
+    return (__bridge NSString *)kCGImagePropertyGIFUnclampedDelayTime;
+}
+
++ (NSString *)delayTimeProperty {
+    return (__bridge NSString *)kCGImagePropertyGIFDelayTime;
+}
+
++ (NSString *)loopCountProperty {
+    return (__bridge NSString *)kCGImagePropertyGIFLoopCount;
+}
+
++ (NSUInteger)defaultLoopCount {
+    return 1;
+}
+
+@end
diff --git a/SDWebImage/Core/SDImageGraphics.h b/SDWebImage/Core/SDImageGraphics.h
new file mode 100644
index 000000000..131d68508
--- /dev/null
+++ b/SDWebImage/Core/SDImageGraphics.h
@@ -0,0 +1,28 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+#import <CoreGraphics/CoreGraphics.h>
+
+/**
+ These following graphics context method are provided to easily write cross-platform(AppKit/UIKit) code.
+ For UIKit, these methods just call the same method in `UIGraphics.h`. See the documentation for usage.
+ For AppKit, these methods use `NSGraphicsContext` to create image context and match the behavior like UIKit.
+ @note If you don't care bitmap format (ARGB8888) and just draw image, use `SDGraphicsImageRenderer` instead. It's more performant on RAM usage.`
+ */
+
+/// Returns the current graphics context.
+FOUNDATION_EXPORT CGContextRef __nullable SDGraphicsGetCurrentContext(void) CF_RETURNS_NOT_RETAINED;
+/// Creates a bitmap-based graphics context and makes it the current context.
+FOUNDATION_EXPORT void SDGraphicsBeginImageContext(CGSize size);
+/// Creates a bitmap-based graphics context with the specified options.
+FOUNDATION_EXPORT void SDGraphicsBeginImageContextWithOptions(CGSize size, BOOL opaque, CGFloat scale);
+/// Removes the current bitmap-based graphics context from the top of the stack.
+FOUNDATION_EXPORT void SDGraphicsEndImageContext(void);
+/// Returns an image based on the contents of the current bitmap-based graphics context.
+FOUNDATION_EXPORT UIImage * __nullable SDGraphicsGetImageFromCurrentImageContext(void);
diff --git a/SDWebImage/Core/SDImageGraphics.m b/SDWebImage/Core/SDImageGraphics.m
new file mode 100644
index 000000000..2e877f3d6
--- /dev/null
+++ b/SDWebImage/Core/SDImageGraphics.m
@@ -0,0 +1,126 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDImageGraphics.h"
+#import "NSImage+Compatibility.h"
+#import "SDImageCoderHelper.h"
+#import "objc/runtime.h"
+
+#if SD_MAC
+static void *kNSGraphicsContextScaleFactorKey;
+
+static CGContextRef SDCGContextCreateBitmapContext(CGSize size, BOOL opaque, CGFloat scale) {
+    if (scale == 0) {
+        // Match `UIGraphicsBeginImageContextWithOptions`, reset to the scale factor of the device’s main screen if scale is 0.
+        NSScreen *mainScreen = nil;
+        if (@available(macOS 10.12, *)) {
+            mainScreen = [NSScreen mainScreen];
+        } else {
+            mainScreen = [NSScreen screens].firstObject;
+        }
+        scale = mainScreen.backingScaleFactor ?: 1.0f;
+    }
+    size_t width = ceil(size.width * scale);
+    size_t height = ceil(size.height * scale);
+    if (width < 1 || height < 1) return NULL;
+    
+    CGColorSpaceRef space = [SDImageCoderHelper colorSpaceGetDeviceRGB];
+    // kCGImageAlphaNone is not supported in CGBitmapContextCreate.
+    // Check #3330 for more detail about why this bitmap is choosen.
+    // From v5.17.0, use runtime detection of bitmap info instead of hardcode.
+    // However, macOS's runtime detection will also call this function, cause recursive, so still hardcode here
+    CGBitmapInfo bitmapInfo;
+    if (!opaque) {
+        // [NSImage imageWithSize:flipped:drawingHandler:] returns float(16-bits) RGBA8888 on alpha image, which we don't need
+        bitmapInfo = kCGBitmapByteOrderDefault | kCGImageAlphaPremultipliedLast;
+    } else {
+        bitmapInfo = kCGBitmapByteOrderDefault | kCGImageAlphaNoneSkipLast;
+    }
+    CGContextRef context = CGBitmapContextCreate(NULL, width, height, 8, 0, space, bitmapInfo);
+    if (!context) {
+        return NULL;
+    }
+    CGContextScaleCTM(context, scale, scale);
+    
+    return context;
+}
+#endif
+
+CGContextRef SDGraphicsGetCurrentContext(void) {
+#if SD_UIKIT || SD_WATCH
+    return UIGraphicsGetCurrentContext();
+#else
+    return NSGraphicsContext.currentContext.CGContext;
+#endif
+}
+
+void SDGraphicsBeginImageContext(CGSize size) {
+#if SD_UIKIT || SD_WATCH
+    UIGraphicsBeginImageContext(size);
+#else
+    SDGraphicsBeginImageContextWithOptions(size, NO, 1.0);
+#endif
+}
+
+void SDGraphicsBeginImageContextWithOptions(CGSize size, BOOL opaque, CGFloat scale) {
+#if SD_UIKIT || SD_WATCH
+    UIGraphicsBeginImageContextWithOptions(size, opaque, scale);
+#else
+    CGContextRef context = SDCGContextCreateBitmapContext(size, opaque, scale);
+    if (!context) {
+        return;
+    }
+    NSGraphicsContext *graphicsContext = [NSGraphicsContext graphicsContextWithCGContext:context flipped:NO];
+    objc_setAssociatedObject(graphicsContext, &kNSGraphicsContextScaleFactorKey, @(scale), OBJC_ASSOCIATION_RETAIN);
+    CGContextRelease(context);
+    [NSGraphicsContext saveGraphicsState];
+    NSGraphicsContext.currentContext = graphicsContext;
+#endif
+}
+
+void SDGraphicsEndImageContext(void) {
+#if SD_UIKIT || SD_WATCH
+    UIGraphicsEndImageContext();
+#else
+    [NSGraphicsContext restoreGraphicsState];
+#endif
+}
+
+UIImage * SDGraphicsGetImageFromCurrentImageContext(void) {
+#if SD_UIKIT || SD_WATCH
+    return UIGraphicsGetImageFromCurrentImageContext();
+#else
+    NSGraphicsContext *context = NSGraphicsContext.currentContext;
+    CGContextRef contextRef = context.CGContext;
+    if (!contextRef) {
+        return nil;
+    }
+    CGImageRef imageRef = CGBitmapContextCreateImage(contextRef);
+    if (!imageRef) {
+        return nil;
+    }
+    CGFloat scale = 0;
+    NSNumber *scaleFactor = objc_getAssociatedObject(context, &kNSGraphicsContextScaleFactorKey);
+    if ([scaleFactor isKindOfClass:[NSNumber class]]) {
+        scale = scaleFactor.doubleValue;
+    }
+    if (!scale) {
+        // reset to the scale factor of the device’s main screen if scale is 0.
+        NSScreen *mainScreen = nil;
+        if (@available(macOS 10.12, *)) {
+            mainScreen = [NSScreen mainScreen];
+        } else {
+            mainScreen = [NSScreen screens].firstObject;
+        }
+        scale = mainScreen.backingScaleFactor ?: 1.0f;
+    }
+    NSImage *image = [[NSImage alloc] initWithCGImage:imageRef scale:scale orientation:kCGImagePropertyOrientationUp];
+    CGImageRelease(imageRef);
+    return image;
+#endif
+}
diff --git a/SDWebImage/Core/SDImageHEICCoder.h b/SDWebImage/Core/SDImageHEICCoder.h
new file mode 100644
index 000000000..f7dd6612f
--- /dev/null
+++ b/SDWebImage/Core/SDImageHEICCoder.h
@@ -0,0 +1,25 @@
+/*
+* This file is part of the SDWebImage package.
+* (c) Olivier Poitrey <rs@dailymotion.com>
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code.
+*/
+
+#import <Foundation/Foundation.h>
+#import "SDImageIOAnimatedCoder.h"
+
+/**
+ This coder is used for HEIC (HEIF with HEVC container codec) image format.
+ Image/IO provide the static HEIC (.heic) support in iOS 11/macOS 10.13/tvOS 11/watchOS 4+.
+ Image/IO provide the animated HEIC (.heics) support in iOS 13/macOS 10.15/tvOS 13/watchOS 6+.
+ See https://nokiatech.github.io/heif/technical.html for the standard.
+ @note This coder is not in the default coder list for now, since HEIC animated image is really rare, and Apple's implementation still contains performance issues. You can enable if you need this.
+ @note If you need to support lower firmware version for HEIF, you can have a try at https://github.com/SDWebImage/SDWebImageHEIFCoder
+ */
+API_AVAILABLE(ios(13.0), tvos(13.0), macos(10.15), watchos(6.0))
+@interface SDImageHEICCoder : SDImageIOAnimatedCoder <SDProgressiveImageCoder, SDAnimatedImageCoder>
+
+@property (nonatomic, class, readonly, nonnull) SDImageHEICCoder *sharedCoder;
+
+@end
diff --git a/SDWebImage/Core/SDImageHEICCoder.m b/SDWebImage/Core/SDImageHEICCoder.m
new file mode 100644
index 000000000..5e03a8d20
--- /dev/null
+++ b/SDWebImage/Core/SDImageHEICCoder.m
@@ -0,0 +1,109 @@
+/*
+* This file is part of the SDWebImage package.
+* (c) Olivier Poitrey <rs@dailymotion.com>
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code.
+*/
+
+#import "SDImageHEICCoder.h"
+#import "SDImageIOAnimatedCoderInternal.h"
+
+// These constants are available from iOS 13+ and Xcode 11. This raw value is used for toolchain and firmware compatibility
+static NSString * kSDCGImagePropertyHEICSDictionary = @"{HEICS}";
+static NSString * kSDCGImagePropertyHEICSLoopCount = @"LoopCount";
+static NSString * kSDCGImagePropertyHEICSDelayTime = @"DelayTime";
+static NSString * kSDCGImagePropertyHEICSUnclampedDelayTime = @"UnclampedDelayTime";
+
+@implementation SDImageHEICCoder
+
++ (void)initialize {
+    if (@available(iOS 13, tvOS 13, macOS 10.15, watchOS 6, *)) {
+        // Use SDK instead of raw value
+        kSDCGImagePropertyHEICSDictionary = (__bridge NSString *)kCGImagePropertyHEICSDictionary;
+        kSDCGImagePropertyHEICSLoopCount = (__bridge NSString *)kCGImagePropertyHEICSLoopCount;
+        kSDCGImagePropertyHEICSDelayTime = (__bridge NSString *)kCGImagePropertyHEICSDelayTime;
+        kSDCGImagePropertyHEICSUnclampedDelayTime = (__bridge NSString *)kCGImagePropertyHEICSUnclampedDelayTime;
+    }
+}
+
++ (instancetype)sharedCoder {
+    static SDImageHEICCoder *coder;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        coder = [[SDImageHEICCoder alloc] init];
+    });
+    return coder;
+}
+
+#pragma mark - SDImageCoder
+
+- (BOOL)canDecodeFromData:(nullable NSData *)data {
+    switch ([NSData sd_imageFormatForImageData:data]) {
+        case SDImageFormatHEIC:
+            // Check HEIC decoding compatibility
+            return [self.class canDecodeFromFormat:SDImageFormatHEIC];
+        case SDImageFormatHEIF:
+            // Check HEIF decoding compatibility
+            return [self.class canDecodeFromFormat:SDImageFormatHEIF];
+        default:
+            return NO;
+    }
+}
+
+- (BOOL)canIncrementalDecodeFromData:(NSData *)data {
+    return [self canDecodeFromData:data];
+}
+
+- (BOOL)canEncodeToFormat:(SDImageFormat)format {
+    switch (format) {
+        case SDImageFormatHEIC:
+            // Check HEIC encoding compatibility
+            return [self.class canEncodeToFormat:SDImageFormatHEIC];
+        case SDImageFormatHEIF:
+            // Check HEIF encoding compatibility
+            return [self.class canEncodeToFormat:SDImageFormatHEIF];
+        default:
+            return NO;
+    }
+}
+
+#pragma mark - Subclass Override
+
++ (SDImageFormat)imageFormat {
+    return SDImageFormatHEIC;
+}
+
++ (NSString *)imageUTType {
+    // See: https://nokiatech.github.io/heif/technical.html
+    // Actually HEIC has another concept called `non-timed Image Sequence`, which can be encoded using `public.heic`
+    return (__bridge NSString *)kSDUTTypeHEIC;
+}
+
++ (NSString *)animatedImageUTType {
+    // See: https://nokiatech.github.io/heif/technical.html
+    // We use `timed Image Sequence`, means, `public.heics` for animated image encoding
+    return (__bridge NSString *)kSDUTTypeHEICS;
+}
+
++ (NSString *)dictionaryProperty {
+    return kSDCGImagePropertyHEICSDictionary;
+}
+
++ (NSString *)unclampedDelayTimeProperty {
+    return kSDCGImagePropertyHEICSUnclampedDelayTime;
+}
+
++ (NSString *)delayTimeProperty {
+    return kSDCGImagePropertyHEICSDelayTime;
+}
+
++ (NSString *)loopCountProperty {
+    return kSDCGImagePropertyHEICSLoopCount;
+}
+
++ (NSUInteger)defaultLoopCount {
+    return 0;
+}
+
+@end
diff --git a/SDWebImage/Core/SDImageIOAnimatedCoder.h b/SDWebImage/Core/SDImageIOAnimatedCoder.h
new file mode 100644
index 000000000..02fb6d90b
--- /dev/null
+++ b/SDWebImage/Core/SDImageIOAnimatedCoder.h
@@ -0,0 +1,65 @@
+/*
+* This file is part of the SDWebImage package.
+* (c) Olivier Poitrey <rs@dailymotion.com>
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code.
+*/
+
+#import <Foundation/Foundation.h>
+#import "SDImageCoder.h"
+
+/**
+ This is the abstract class for all animated coder, which use the Image/IO API. You can not use this directly as real coders. A exception will be raised if you use this class.
+ All of the properties need the subclass to implement and works as expected.
+ For Image/IO, See Apple's documentation: https://developer.apple.com/documentation/imageio
+ */
+@interface SDImageIOAnimatedCoder : NSObject <SDProgressiveImageCoder, SDAnimatedImageCoder>
+
+#pragma mark - Subclass Override
+/**
+ The supported animated image format. Such as `SDImageFormatGIF`.
+ @note Subclass override.
+ */
+@property (class, readonly) SDImageFormat imageFormat;
+/**
+ The supported image format UTI Type. Such as `kSDUTTypeGIF`.
+ This can be used for cases when we can not detect `SDImageFormat. Such as progressive decoding's hint format `kCGImageSourceTypeIdentifierHint`.
+ @note Subclass override.
+ */
+@property (class, readonly, nonnull) NSString *imageUTType;
+/**
+ Some image codec use different UTI Type between animated image and static image.
+ For this case, override this method and return the UTI for animated image encoding.
+ @note Defaults to use the value of `imageUTType`, so it's @optional actually.
+ @note Subclass override.
+ */
+@property (class, readonly, nonnull) NSString *animatedImageUTType;
+/**
+ The image container property key used in Image/IO API. Such as `kCGImagePropertyGIFDictionary`.
+ @note Subclass override.
+ */
+@property (class, readonly, nonnull) NSString *dictionaryProperty;
+/**
+ The image unclamped delay time property key used in Image/IO  API. Such as `kCGImagePropertyGIFUnclampedDelayTime`
+ @note Subclass override.
+ */
+@property (class, readonly, nonnull) NSString *unclampedDelayTimeProperty;
+/**
+ The image delay time property key used in Image/IO API. Such as `kCGImagePropertyGIFDelayTime`.
+ @note Subclass override.
+ */
+@property (class, readonly, nonnull) NSString *delayTimeProperty;
+/**
+ The image loop count property key used in Image/IO API. Such as `kCGImagePropertyGIFLoopCount`.
+ @note Subclass override.
+ */
+@property (class, readonly, nonnull) NSString *loopCountProperty;
+/**
+ The default loop count when there are no any loop count information inside image container metadata.
+ For example, for GIF format, the standard use 1 (play once). For APNG format, the standard use 0 (infinity loop).
+ @note Subclass override.
+ */
+@property (class, readonly) NSUInteger defaultLoopCount;
+
+@end
diff --git a/SDWebImage/Core/SDImageIOAnimatedCoder.m b/SDWebImage/Core/SDImageIOAnimatedCoder.m
new file mode 100644
index 000000000..d4e997044
--- /dev/null
+++ b/SDWebImage/Core/SDImageIOAnimatedCoder.m
@@ -0,0 +1,1174 @@
+/*
+* This file is part of the SDWebImage package.
+* (c) Olivier Poitrey <rs@dailymotion.com>
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code.
+*/
+
+#import "SDImageIOAnimatedCoder.h"
+#import "SDImageIOAnimatedCoderInternal.h"
+#import "NSImage+Compatibility.h"
+#import "UIImage+Metadata.h"
+#import "NSData+ImageContentType.h"
+#import "SDImageCoderHelper.h"
+#import "SDAnimatedImageRep.h"
+#import "UIImage+ForceDecode.h"
+#import "SDInternalMacros.h"
+
+#import <ImageIO/ImageIO.h>
+#import <CoreServices/CoreServices.h>
+
+#if SD_CHECK_CGIMAGE_RETAIN_SOURCE
+#import <dlfcn.h>
+
+// SPI to check thread safe during Example and Test
+static CGImageSourceRef (*SDCGImageGetImageSource)(CGImageRef);
+#endif
+
+// Specify File Size for lossy format encoding, like JPEG
+static NSString * kSDCGImageDestinationRequestedFileSize = @"kCGImageDestinationRequestedFileSize";
+// Support Xcode 15 SDK, use raw value instead of symbol
+static NSString * kSDCGImageDestinationEncodeRequest = @"kCGImageDestinationEncodeRequest";
+static NSString * kSDCGImageDestinationEncodeToSDR = @"kCGImageDestinationEncodeToSDR";
+static NSString * kSDCGImageDestinationEncodeToISOHDR = @"kCGImageDestinationEncodeToISOHDR";
+static NSString * kSDCGImageDestinationEncodeToISOGainmap = @"kCGImageDestinationEncodeToISOGainmap";
+
+
+// This strip the un-wanted CGImageProperty, like the internal CGImageSourceRef in iOS 15+
+// However, CGImageCreateCopy still keep those CGImageProperty, not suit for our use case
+static CGImageRef __nullable SDCGImageCreateMutableCopy(CGImageRef cg_nullable image, CGBitmapInfo bitmapInfo) {
+    if (!image) return nil;
+    size_t width = CGImageGetWidth(image);
+    size_t height = CGImageGetHeight(image);
+    size_t bitsPerComponent = CGImageGetBitsPerComponent(image);
+    size_t bitsPerPixel = CGImageGetBitsPerPixel(image);
+    size_t bytesPerRow = CGImageGetBytesPerRow(image);
+    CGColorSpaceRef space = CGImageGetColorSpace(image);
+    CGDataProviderRef provider = CGImageGetDataProvider(image);
+    const CGFloat *decode = CGImageGetDecode(image);
+    bool shouldInterpolate = CGImageGetShouldInterpolate(image);
+    CGColorRenderingIntent intent = CGImageGetRenderingIntent(image);
+    CGImageRef newImage = CGImageCreate(width, height, bitsPerComponent, bitsPerPixel, bytesPerRow, space, bitmapInfo, provider, decode, shouldInterpolate, intent);
+    return newImage;
+}
+
+static inline BOOL SDCGImageIs8Bit(CGImageRef cg_nullable image) {
+    return CGImageGetBitsPerComponent(image) == 8;
+}
+
+static inline CGImageRef __nullable SDCGImageCreateCopy(CGImageRef cg_nullable image) {
+    if (!image) return nil;
+    return SDCGImageCreateMutableCopy(image, CGImageGetBitmapInfo(image));
+}
+
+static BOOL SDLoadOnePixelBitmapBuffer(CGImageRef imageRef, uint8_t *r, uint8_t *g, uint8_t *b, uint8_t *a) {
+    CGBitmapInfo bitmapInfo = CGImageGetBitmapInfo(imageRef);
+    CGImageAlphaInfo alphaInfo = bitmapInfo & kCGBitmapAlphaInfoMask;
+    CGBitmapInfo byteOrderInfo = bitmapInfo & kCGBitmapByteOrderMask;
+    
+    // Get pixels
+    CGDataProviderRef provider = CGImageGetDataProvider(imageRef);
+    if (!provider) {
+        return NO;
+    }
+    CFDataRef data = CGDataProviderCopyData(provider);
+    if (!data) {
+        return NO;
+    }
+    
+    CFRange range = CFRangeMake(0, 4); // one pixel
+    if (CFDataGetLength(data) < range.location + range.length) {
+        CFRelease(data);
+        return NO;
+    }
+    uint8_t pixel[4] = {0};
+    CFDataGetBytes(data, range, pixel);
+    CFRelease(data);
+    
+    BOOL byteOrderNormal = NO;
+    switch (byteOrderInfo) {
+        case kCGBitmapByteOrderDefault: {
+            byteOrderNormal = YES;
+        } break;
+        case kCGBitmapByteOrder16Little:
+        case kCGBitmapByteOrder32Little: {
+        } break;
+        case kCGBitmapByteOrder16Big:
+        case kCGBitmapByteOrder32Big: {
+            byteOrderNormal = YES;
+        } break;
+        default: break;
+    }
+    switch (alphaInfo) {
+        case kCGImageAlphaPremultipliedFirst:
+        case kCGImageAlphaFirst: {
+            if (byteOrderNormal) {
+                // ARGB8888
+                *a = pixel[0];
+                *r = pixel[1];
+                *g = pixel[2];
+                *b = pixel[3];
+            } else {
+                // BGRA8888
+                *b = pixel[0];
+                *g = pixel[1];
+                *r = pixel[2];
+                *a = pixel[3];
+            }
+        }
+            break;
+        case kCGImageAlphaPremultipliedLast:
+        case kCGImageAlphaLast: {
+            if (byteOrderNormal) {
+                // RGBA8888
+                *r = pixel[0];
+                *g = pixel[1];
+                *b = pixel[2];
+                *a = pixel[3];
+            } else {
+                // ABGR8888
+                *a = pixel[0];
+                *b = pixel[1];
+                *g = pixel[2];
+                *r = pixel[3];
+            }
+        }
+            break;
+        case kCGImageAlphaNone: {
+            if (byteOrderNormal) {
+                // RGB
+                *r = pixel[0];
+                *g = pixel[1];
+                *b = pixel[2];
+            } else {
+                // BGR
+                *b = pixel[0];
+                *g = pixel[1];
+                *r = pixel[2];
+            }
+        }
+            break;
+        case kCGImageAlphaNoneSkipLast: {
+            if (byteOrderNormal) {
+                // RGBX
+                *r = pixel[0];
+                *g = pixel[1];
+                *b = pixel[2];
+            } else {
+                // XBGR
+                *b = pixel[1];
+                *g = pixel[2];
+                *r = pixel[3];
+            }
+        }
+            break;
+        case kCGImageAlphaNoneSkipFirst: {
+            if (byteOrderNormal) {
+                // XRGB
+                *r = pixel[1];
+                *g = pixel[2];
+                *b = pixel[3];
+            } else {
+                // BGRX
+                *b = pixel[0];
+                *g = pixel[1];
+                *r = pixel[2];
+            }
+        }
+            break;
+        case kCGImageAlphaOnly: {
+            // A
+            *a = pixel[0];
+        }
+            break;
+        default:
+            break;
+    }
+    
+    return YES;
+}
+
+static CGImageRef SDImageIOPNGPluginBuggyCreateWorkaround(CGImageRef cgImage) CF_RETURNS_RETAINED {
+    CGBitmapInfo bitmapInfo = CGImageGetBitmapInfo(cgImage);
+    CGImageAlphaInfo alphaInfo = (bitmapInfo & kCGBitmapAlphaInfoMask);
+    CGImageAlphaInfo newAlphaInfo = alphaInfo;
+    if (alphaInfo == kCGImageAlphaLast) {
+        newAlphaInfo = kCGImageAlphaPremultipliedLast;
+    } else if (alphaInfo == kCGImageAlphaFirst) {
+        newAlphaInfo = kCGImageAlphaPremultipliedFirst;
+    }
+    if (newAlphaInfo != alphaInfo) {
+        CGBitmapInfo byteOrderInfo = bitmapInfo & kCGBitmapByteOrderMask;
+        CGBitmapInfo newBitmapInfo = newAlphaInfo | byteOrderInfo;
+        if (SD_OPTIONS_CONTAINS(bitmapInfo, kCGBitmapFloatComponents)) {
+            // Keep float components
+            newBitmapInfo |= kCGBitmapFloatComponents;
+        }
+        // Create new CGImage with corrected alpha info...
+        CGImageRef newCGImage = SDCGImageCreateMutableCopy(cgImage, newBitmapInfo);
+        return newCGImage;
+    } else {
+        CGImageRetain(cgImage);
+        return cgImage;
+    }
+}
+
+static BOOL SDImageIOPNGPluginBuggyNeedWorkaround(void) {
+    // See: #3605 FB13322459
+    // ImageIO on iOS 17 (17.0~17.2), there is one serious problem on ImageIO PNG plugin. The decode result for indexed color PNG use the wrong CGImageAlphaInfo
+    // The returned CGImageAlphaInfo is alpha last, but the actual bitmap data is premultiplied alpha last, which cause many runtime render bug.
+    // The bug only exists on 8-bits indexed color, not about 16-bits
+    // So, we do a hack workaround:
+    // 1. Decode a indexed color PNG in runtime
+    // 2. If the bitmap is premultiplied alpha, then assume it's buggy
+    // 3. If buggy, then all premultiplied `CGImageAlphaInfo` will assume to be non-premultiplied
+    // :)
+    
+    if (@available(iOS 17, tvOS 17, macOS 14, watchOS 11, *)) {
+        // Continue
+    } else {
+        return NO;
+    }
+    static BOOL isBuggy = NO;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        NSString *base64String = @"iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEUyMjKlMgnVAAAAAXRSTlMyiDGJ5gAAAApJREFUCNdjYAAAAAIAAeIhvDMAAAAASUVORK5CYII=";
+        NSData *onePixelIndexedPNGData = [[NSData alloc] initWithBase64EncodedString:base64String options:NSDataBase64DecodingIgnoreUnknownCharacters];
+        CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef)onePixelIndexedPNGData, nil);
+        NSCParameterAssert(source);
+        CGImageRef cgImage = CGImageSourceCreateImageAtIndex(source, 0, nil);
+        NSCParameterAssert(cgImage);
+        uint8_t r, g, b, a;
+        r = g = b = a = 0;
+        BOOL success = SDLoadOnePixelBitmapBuffer(cgImage, &r, &g, &b, &a);
+        if (!success) {
+            isBuggy = NO; // Impossible...
+        } else {
+            if (r == 50 && g == 50 && b == 50 && a == 50) {
+                // Correct value
+                isBuggy = NO;
+            } else {
+                SD_LOG("%@", @"Detected the current OS's ImageIO PNG Decoder is buggy on indexed color PNG. Perform workaround solution...");
+                isBuggy = YES;
+            }
+        }
+        CFRelease(source);
+        CGImageRelease(cgImage);
+    });
+    
+    return isBuggy;
+}
+
+@interface SDImageIOCoderFrame : NSObject
+
+@property (nonatomic, assign) NSUInteger index; // Frame index (zero based)
+@property (nonatomic, assign) NSTimeInterval duration; // Frame duration in seconds
+
+@end
+
+@implementation SDImageIOCoderFrame
+@end
+
+@implementation SDImageIOAnimatedCoder {
+    size_t _width, _height;
+    CGImageSourceRef _imageSource;
+    BOOL _incremental;
+    SD_LOCK_DECLARE(_lock); // Lock only apply for incremental animation decoding
+    NSData *_imageData;
+    CGFloat _scale;
+    NSUInteger _loopCount;
+    NSUInteger _frameCount;
+    NSArray<SDImageIOCoderFrame *> *_frames;
+    BOOL _finished;
+    BOOL _preserveAspectRatio;
+    CGSize _thumbnailSize;
+    NSUInteger _limitBytes;
+    BOOL _lazyDecode;
+    BOOL _decodeToHDR;
+}
+
+#if SD_IMAGEIO_HDR_ENCODING
++ (void)initialize {
+    if (@available(macOS 15, iOS 18, tvOS 18, watchOS 11, *)) {
+        // Use SDK instead of raw value
+        kSDCGImageDestinationEncodeRequest = (__bridge NSString *)kCGImageDestinationEncodeRequest;
+        kSDCGImageDestinationEncodeToSDR = (__bridge NSString *)kCGImageDestinationEncodeToSDR;
+        kSDCGImageDestinationEncodeToISOHDR = (__bridge NSString *)kCGImageDestinationEncodeToISOHDR;
+        kSDCGImageDestinationEncodeToISOGainmap = (__bridge NSString *)kCGImageDestinationEncodeToISOGainmap;
+    }
+}
+#endif
+
+- (void)dealloc
+{
+    if (_imageSource) {
+        CFRelease(_imageSource);
+        _imageSource = NULL;
+    }
+#if SD_UIKIT
+    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
+#endif
+}
+
+- (void)didReceiveMemoryWarning:(NSNotification *)notification
+{
+    // Incremental decoding may concurrently read/write _imageSource from the
+    // frame fetch queue and updateIncrementalData:; hold the same lock to
+    // prevent races with CGImageSourceRemoveCacheAtIndex.
+    if (_incremental) {
+        SD_LOCK(_lock);
+    }
+    if (_imageSource) {
+        for (size_t i = 0; i < _frameCount; i++) {
+            CGImageSourceRemoveCacheAtIndex(_imageSource, i);
+        }
+    }
+    if (_incremental) {
+        SD_UNLOCK(_lock);
+    }
+}
+
+#pragma mark - Subclass Override
+
++ (SDImageFormat)imageFormat {
+    @throw [NSException exceptionWithName:NSInternalInconsistencyException
+                                   reason:[NSString stringWithFormat:@"For `SDImageIOAnimatedCoder` subclass, you must override %@ method", NSStringFromSelector(_cmd)]
+                                 userInfo:nil];
+}
+
++ (NSString *)imageUTType {
+    @throw [NSException exceptionWithName:NSInternalInconsistencyException
+                                   reason:[NSString stringWithFormat:@"For `SDImageIOAnimatedCoder` subclass, you must override %@ method", NSStringFromSelector(_cmd)]
+                                 userInfo:nil];
+}
+
++ (NSString *)animatedImageUTType {
+    return [self imageUTType];
+}
+
++ (NSString *)dictionaryProperty {
+    @throw [NSException exceptionWithName:NSInternalInconsistencyException
+                                   reason:[NSString stringWithFormat:@"For `SDImageIOAnimatedCoder` subclass, you must override %@ method", NSStringFromSelector(_cmd)]
+                                 userInfo:nil];
+}
+
++ (NSString *)unclampedDelayTimeProperty {
+    @throw [NSException exceptionWithName:NSInternalInconsistencyException
+                                   reason:[NSString stringWithFormat:@"For `SDImageIOAnimatedCoder` subclass, you must override %@ method", NSStringFromSelector(_cmd)]
+                                 userInfo:nil];
+}
+
++ (NSString *)delayTimeProperty {
+    @throw [NSException exceptionWithName:NSInternalInconsistencyException
+                                   reason:[NSString stringWithFormat:@"For `SDImageIOAnimatedCoder` subclass, you must override %@ method", NSStringFromSelector(_cmd)]
+                                 userInfo:nil];
+}
+
++ (NSString *)loopCountProperty {
+    @throw [NSException exceptionWithName:NSInternalInconsistencyException
+                                   reason:[NSString stringWithFormat:@"For `SDImageIOAnimatedCoder` subclass, you must override %@ method", NSStringFromSelector(_cmd)]
+                                 userInfo:nil];
+}
+
++ (NSUInteger)defaultLoopCount {
+    @throw [NSException exceptionWithName:NSInternalInconsistencyException
+                                   reason:[NSString stringWithFormat:@"For `SDImageIOAnimatedCoder` subclass, you must override %@ method", NSStringFromSelector(_cmd)]
+                                 userInfo:nil];
+}
+
+#pragma mark - Utils
+
++ (BOOL)canDecodeFromFormat:(SDImageFormat)format {
+    static dispatch_once_t onceToken;
+    static NSSet *imageUTTypeSet;
+    dispatch_once(&onceToken, ^{
+        NSArray *imageUTTypes = (__bridge_transfer NSArray *)CGImageSourceCopyTypeIdentifiers();
+        imageUTTypeSet = [NSSet setWithArray:imageUTTypes];
+    });
+    CFStringRef imageUTType = [NSData sd_UTTypeFromImageFormat:format];
+    if ([imageUTTypeSet containsObject:(__bridge NSString *)(imageUTType)]) {
+        // Can decode from target format
+        return YES;
+    }
+    return NO;
+}
+
++ (BOOL)canEncodeToFormat:(SDImageFormat)format {
+    static dispatch_once_t onceToken;
+    static NSSet *imageUTTypeSet;
+    dispatch_once(&onceToken, ^{
+        NSArray *imageUTTypes = (__bridge_transfer NSArray *)CGImageDestinationCopyTypeIdentifiers();
+        imageUTTypeSet = [NSSet setWithArray:imageUTTypes];
+    });
+    CFStringRef imageUTType = [NSData sd_UTTypeFromImageFormat:format];
+    if ([imageUTTypeSet containsObject:(__bridge NSString *)(imageUTType)]) {
+        // Can encode to target format
+        return YES;
+    }
+    return NO;
+}
+
++ (NSUInteger)imageLoopCountWithSource:(CGImageSourceRef)source {
+    NSUInteger loopCount = self.defaultLoopCount;
+    NSDictionary *imageProperties = (__bridge_transfer NSDictionary *)CGImageSourceCopyProperties(source, NULL);
+    NSDictionary *containerProperties = imageProperties[self.dictionaryProperty];
+    if (containerProperties) {
+        NSNumber *containerLoopCount = containerProperties[self.loopCountProperty];
+        if (containerLoopCount != nil) {
+            loopCount = containerLoopCount.unsignedIntegerValue;
+        }
+    }
+    return loopCount;
+}
+
++ (NSTimeInterval)frameDurationAtIndex:(NSUInteger)index source:(CGImageSourceRef)source {
+    NSTimeInterval frameDuration = 0.1;
+    CFDictionaryRef cfFrameProperties = CGImageSourceCopyPropertiesAtIndex(source, index, NULL);
+    if (!cfFrameProperties) {
+        return frameDuration;
+    }
+    NSDictionary *frameProperties = (__bridge NSDictionary *)cfFrameProperties;
+    NSDictionary *containerProperties = frameProperties[self.dictionaryProperty];
+    
+    NSNumber *delayTimeUnclampedProp = containerProperties[self.unclampedDelayTimeProperty];
+    if (delayTimeUnclampedProp != nil) {
+        frameDuration = [delayTimeUnclampedProp doubleValue];
+    } else {
+        NSNumber *delayTimeProp = containerProperties[self.delayTimeProperty];
+        if (delayTimeProp != nil) {
+            frameDuration = [delayTimeProp doubleValue];
+        }
+    }
+    
+    // Many annoying ads specify a 0 duration to make an image flash as quickly as possible.
+    // We follow Firefox's behavior and use a duration of 100 ms for any frames that specify
+    // a duration of <= 10 ms. See <rdar://problem/7689300> and <http://webkit.org/b/36082>
+    // for more information.
+    
+    if (frameDuration < 0.011) {
+        frameDuration = 0.1;
+    }
+    
+    CFRelease(cfFrameProperties);
+    return frameDuration;
+}
+
++ (UIImage *)createFrameAtIndex:(NSUInteger)index source:(CGImageSourceRef)source scale:(CGFloat)scale preserveAspectRatio:(BOOL)preserveAspectRatio thumbnailSize:(CGSize)thumbnailSize lazyDecode:(BOOL)lazyDecode animatedImage:(BOOL)animatedImage decodeToHDR:(BOOL)decodeToHDR {
+    // `animatedImage` means called from `SDAnimatedImageProvider.animatedImageFrameAtIndex`
+    NSDictionary *options;
+    if (animatedImage) {
+        if (!lazyDecode) {
+            options = @{
+                // image decoding and caching should happen at image creation time.
+                (__bridge NSString *)kCGImageSourceShouldCacheImmediately : @(YES),
+            };
+        } else {
+            options = @{
+                // image decoding will happen at rendering time
+                (__bridge NSString *)kCGImageSourceShouldCacheImmediately : @(NO),
+            };
+        }
+    }
+    // Parse the image properties
+    NSDictionary *properties = (__bridge_transfer NSDictionary *)CGImageSourceCopyPropertiesAtIndex(source, index, NULL);
+    CGFloat pixelWidth = [properties[(__bridge NSString *)kCGImagePropertyPixelWidth] doubleValue];
+    CGFloat pixelHeight = [properties[(__bridge NSString *)kCGImagePropertyPixelHeight] doubleValue];
+    CGImagePropertyOrientation exifOrientation = kCGImagePropertyOrientationUp;
+    NSNumber *exifOrientationValue = properties[(__bridge NSString *)kCGImagePropertyOrientation];
+    if (exifOrientationValue != NULL) {
+        exifOrientation = [exifOrientationValue unsignedIntValue];
+    }
+
+    NSMutableDictionary *decodingOptions;
+    if (options) {
+        decodingOptions = [NSMutableDictionary dictionaryWithDictionary:options];
+    } else {
+        decodingOptions = [NSMutableDictionary dictionary];
+    }
+    if (@available(macOS 14, iOS 17, tvOS 17, watchOS 10, *)) {
+        if (decodeToHDR) {
+            decodingOptions[(__bridge NSString *)kCGImageSourceDecodeRequest] = (__bridge NSString *)kCGImageSourceDecodeToHDR;
+        } else {
+            decodingOptions[(__bridge NSString *)kCGImageSourceDecodeRequest] = (__bridge NSString *)kCGImageSourceDecodeToSDR;
+        }
+    }
+  
+    CGImageRef imageRef;
+    BOOL createFullImage = thumbnailSize.width == 0 || thumbnailSize.height == 0 || pixelWidth == 0 || pixelHeight == 0 || (pixelWidth <= thumbnailSize.width && pixelHeight <= thumbnailSize.height);
+    if (createFullImage) {
+        imageRef = CGImageSourceCreateImageAtIndex(source, index, (__bridge CFDictionaryRef)[decodingOptions copy]);
+    } else {
+        decodingOptions[(__bridge NSString *)kCGImageSourceCreateThumbnailWithTransform] = @(preserveAspectRatio);
+        CGFloat maxPixelSize;
+        if (preserveAspectRatio) {
+            CGFloat pixelRatio = pixelWidth / pixelHeight;
+            CGFloat thumbnailRatio = thumbnailSize.width / thumbnailSize.height;
+            if (pixelRatio > thumbnailRatio) {
+                maxPixelSize = MAX(thumbnailSize.width, thumbnailSize.width / pixelRatio);
+            } else {
+                maxPixelSize = MAX(thumbnailSize.height, thumbnailSize.height * pixelRatio);
+            }
+        } else {
+            maxPixelSize = MAX(thumbnailSize.width, thumbnailSize.height);
+        }
+        decodingOptions[(__bridge NSString *)kCGImageSourceThumbnailMaxPixelSize] = @(maxPixelSize);
+        decodingOptions[(__bridge NSString *)kCGImageSourceCreateThumbnailFromImageAlways] = @(YES);
+        imageRef = CGImageSourceCreateThumbnailAtIndex(source, index, (__bridge CFDictionaryRef)[decodingOptions copy]);
+    }
+    if (!imageRef) {
+        return nil;
+    }
+    BOOL isHDRImage = [SDImageCoderHelper CGImageIsHDR:imageRef];
+    
+    // Thumbnail image post-process
+    if (!createFullImage) {
+        if (preserveAspectRatio) {
+            // kCGImageSourceCreateThumbnailWithTransform will apply EXIF transform as well, we should not apply twice
+            exifOrientation = kCGImagePropertyOrientationUp;
+        } else {
+            // `CGImageSourceCreateThumbnailAtIndex` take only pixel dimension, if not `preserveAspectRatio`, we should manual scale to the target size
+            CGImageRef scaledImageRef = [SDImageCoderHelper CGImageCreateScaled:imageRef size:thumbnailSize];
+            if (scaledImageRef) {
+                CGImageRelease(imageRef);
+                imageRef = scaledImageRef;
+            }
+        }
+    }
+    
+    // Check whether output CGImage is decoded
+    BOOL isLazy = [SDImageCoderHelper CGImageIsLazy:imageRef];
+    if (!lazyDecode && !isHDRImage) {
+        if (isLazy) {
+            // Use CoreGraphics to trigger immediately decode to drop lazy CGImage
+            CGImageRef decodedImageRef = [SDImageCoderHelper CGImageCreateDecoded:imageRef];
+            if (decodedImageRef) {
+                CGImageRelease(imageRef);
+                imageRef = decodedImageRef;
+                isLazy = NO;
+            }
+        }
+    } else if (animatedImage && !isHDRImage) {
+        // iOS 15+, CGImageRef now retains CGImageSourceRef internally. To workaround its thread-safe issue, we have to strip CGImageSourceRef, using Force-Decode (or have to use SPI `CGImageSetImageSource`), See: https://github.com/SDWebImage/SDWebImage/issues/3273
+        if (@available(iOS 15, tvOS 15, *)) {
+            // User pass `lazyDecode == YES`, but we still have to strip the CGImageSourceRef
+            // CGImageRef newImageRef = CGImageCreateCopy(imageRef); // This one does not strip the CGImageProperty
+            CGImageRef newImageRef = SDCGImageCreateCopy(imageRef);
+            if (newImageRef) {
+                CGImageRelease(imageRef);
+                imageRef = newImageRef;
+            }
+#if SD_CHECK_CGIMAGE_RETAIN_SOURCE
+            // Assert here to check CGImageRef should not retain the CGImageSourceRef and has possible thread-safe issue (this is behavior on iOS 15+)
+            // If assert hit, fire issue to https://github.com/SDWebImage/SDWebImage/issues and we update the condition for this behavior check
+            static dispatch_once_t onceToken;
+            dispatch_once(&onceToken, ^{
+                SDCGImageGetImageSource = dlsym(RTLD_DEFAULT, "CGImageGetImageSource");
+            });
+            if (SDCGImageGetImageSource) {
+                NSCAssert(!SDCGImageGetImageSource(imageRef), @"Animated Coder created CGImageRef should not retain CGImageSourceRef, which may cause thread-safe issue without lock");
+            }
+#endif
+        }
+    }
+    // :)
+    CFStringRef uttype = CGImageSourceGetType(source);
+    SDImageFormat imageFormat = [NSData sd_imageFormatFromUTType:uttype];
+    if (imageFormat == SDImageFormatPNG && SDCGImageIs8Bit(imageRef) && SDImageIOPNGPluginBuggyNeedWorkaround()) {
+        CGImageRef newImageRef = SDImageIOPNGPluginBuggyCreateWorkaround(imageRef);
+        CGImageRelease(imageRef);
+        imageRef = newImageRef;
+    }
+    
+#if SD_UIKIT || SD_WATCH
+    UIImageOrientation imageOrientation = [SDImageCoderHelper imageOrientationFromEXIFOrientation:exifOrientation];
+    UIImage *image = [[UIImage alloc] initWithCGImage:imageRef scale:scale orientation:imageOrientation];
+#else
+    UIImage *image = [[UIImage alloc] initWithCGImage:imageRef scale:scale orientation:exifOrientation];
+#endif
+    CGImageRelease(imageRef);
+    image.sd_isDecoded = !isLazy;
+    
+    return image;
+}
+
+#pragma mark - Decode
+- (BOOL)canDecodeFromData:(nullable NSData *)data {
+    return ([NSData sd_imageFormatForImageData:data] == self.class.imageFormat);
+}
+
+- (UIImage *)decodedImageWithData:(NSData *)data options:(nullable SDImageCoderOptions *)options {
+    if (!data) {
+        return nil;
+    }
+    CGFloat scale = 1;
+    NSNumber *scaleFactor = options[SDImageCoderDecodeScaleFactor];
+    if (scaleFactor != nil) {
+        scale = MAX([scaleFactor doubleValue], 1);
+    }
+    
+    CGSize thumbnailSize = CGSizeZero;
+    NSValue *thumbnailSizeValue = options[SDImageCoderDecodeThumbnailPixelSize];
+    if (thumbnailSizeValue != nil) {
+#if SD_MAC
+        thumbnailSize = thumbnailSizeValue.sizeValue;
+#else
+        thumbnailSize = thumbnailSizeValue.CGSizeValue;
+#endif
+    }
+    
+    BOOL preserveAspectRatio = YES;
+    NSNumber *preserveAspectRatioValue = options[SDImageCoderDecodePreserveAspectRatio];
+    if (preserveAspectRatioValue != nil) {
+        preserveAspectRatio = preserveAspectRatioValue.boolValue;
+    }
+    
+    BOOL lazyDecode = YES; // Defaults YES for static image coder
+    NSNumber *lazyDecodeValue = options[SDImageCoderDecodeUseLazyDecoding];
+    if (lazyDecodeValue != nil) {
+        lazyDecode = lazyDecodeValue.boolValue;
+    }
+    
+    NSUInteger limitBytes = 0;
+    NSNumber *limitBytesValue = options[SDImageCoderDecodeScaleDownLimitBytes];
+    if (limitBytesValue != nil) {
+        limitBytes = limitBytesValue.unsignedIntegerValue;
+    }
+    
+    BOOL decodeToHDR = [options[SDImageCoderDecodeToHDR] boolValue];
+    
+#if SD_MAC
+    // If don't use thumbnail, prefers the built-in generation of frames (GIF/APNG)
+    // Which decode frames in time and reduce memory usage
+    if (limitBytes == 0 && (thumbnailSize.width == 0 || thumbnailSize.height == 0)) {
+        SDAnimatedImageRep *imageRep = [[SDAnimatedImageRep alloc] initWithData:data];
+        if (imageRep) {
+            NSSize size = NSMakeSize(imageRep.pixelsWide / scale, imageRep.pixelsHigh / scale);
+            imageRep.size = size;
+            NSImage *animatedImage = [[NSImage alloc] initWithSize:size];
+            [animatedImage addRepresentation:imageRep];
+            animatedImage.sd_imageFormat = self.class.imageFormat;
+            return animatedImage;
+        }
+    }
+#endif
+    
+    NSString *typeIdentifierHint = options[SDImageCoderDecodeTypeIdentifierHint];
+    if (!typeIdentifierHint) {
+        // Check file extension and convert to UTI, from: https://stackoverflow.com/questions/1506251/getting-an-uniform-type-identifier-for-a-given-extension
+        NSString *fileExtensionHint = options[SDImageCoderDecodeFileExtensionHint];
+        if (fileExtensionHint) {
+            typeIdentifierHint = (__bridge_transfer NSString *)UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, (__bridge CFStringRef)fileExtensionHint, kUTTypeImage);
+            // Ignore dynamic UTI
+            if (UTTypeIsDynamic((__bridge CFStringRef)typeIdentifierHint)) {
+                typeIdentifierHint = nil;
+            }
+        }
+    } else if ([typeIdentifierHint isEqual:NSNull.null]) {
+        // Hack if user don't want to imply file extension
+        typeIdentifierHint = nil;
+    }
+    
+    NSDictionary *creatingOptions = nil;
+    if (typeIdentifierHint) {
+        creatingOptions = @{(__bridge NSString *)kCGImageSourceTypeIdentifierHint : typeIdentifierHint};
+    }
+    CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef)data, (__bridge CFDictionaryRef)creatingOptions);
+    if (!source) {
+        // Try again without UTType hint, the call site from user may provide the wrong UTType
+        source = CGImageSourceCreateWithData((__bridge CFDataRef)data, nil);
+    }
+    if (!source) {
+        return nil;
+    }
+    
+    size_t frameCount = CGImageSourceGetCount(source);
+    UIImage *animatedImage;
+    
+    // Parse the image properties
+    NSDictionary *properties = (__bridge_transfer NSDictionary *)CGImageSourceCopyPropertiesAtIndex(source, 0, NULL);
+    size_t width = [properties[(__bridge NSString *)kCGImagePropertyPixelWidth] doubleValue];
+    size_t height = [properties[(__bridge NSString *)kCGImagePropertyPixelHeight] doubleValue];
+    // Scale down to limit bytes if need
+    if (limitBytes > 0) {
+        // Hack since ImageIO public API (not CGImageDecompressor/CMPhoto) always return back RGBA8888 CGImage
+        CGSize imageSize = CGSizeMake(width, height);
+        CGSize framePixelSize = [SDImageCoderHelper scaledSizeWithImageSize:imageSize limitBytes:limitBytes bytesPerPixel:4 frameCount:frameCount];
+        // Override thumbnail size
+        thumbnailSize = framePixelSize;
+        preserveAspectRatio = YES;
+    }
+    
+    BOOL decodeFirstFrame = [options[SDImageCoderDecodeFirstFrameOnly] boolValue];
+    if (decodeFirstFrame || frameCount <= 1) {
+        animatedImage = [self.class createFrameAtIndex:0 source:source scale:scale preserveAspectRatio:preserveAspectRatio thumbnailSize:thumbnailSize lazyDecode:lazyDecode animatedImage:NO decodeToHDR:decodeToHDR];
+    } else {
+        NSMutableArray<SDImageFrame *> *frames = [NSMutableArray arrayWithCapacity:frameCount];
+        
+        for (size_t i = 0; i < frameCount; i++) {
+            UIImage *image = [self.class createFrameAtIndex:i source:source scale:scale preserveAspectRatio:preserveAspectRatio thumbnailSize:thumbnailSize lazyDecode:lazyDecode animatedImage:NO decodeToHDR:decodeToHDR];
+            if (!image) {
+                continue;
+            }
+            
+            NSTimeInterval duration = [self.class frameDurationAtIndex:i source:source];
+            
+            SDImageFrame *frame = [SDImageFrame frameWithImage:image duration:duration];
+            [frames addObject:frame];
+        }
+        
+        NSUInteger loopCount = [self.class imageLoopCountWithSource:source];
+        
+        animatedImage = [SDImageCoderHelper animatedImageWithFrames:frames];
+        animatedImage.sd_imageLoopCount = loopCount;
+    }
+    animatedImage.sd_imageFormat = self.class.imageFormat;
+    CFRelease(source);
+    
+    return animatedImage;
+}
+
+#pragma mark - Progressive Decode
+
+- (BOOL)canIncrementalDecodeFromData:(NSData *)data {
+    return ([NSData sd_imageFormatForImageData:data] == self.class.imageFormat);
+}
+
+- (instancetype)initIncrementalWithOptions:(nullable SDImageCoderOptions *)options {
+    self = [super init];
+    if (self) {
+        NSString *imageUTType = self.class.imageUTType;
+        _imageSource = CGImageSourceCreateIncremental((__bridge CFDictionaryRef)@{(__bridge NSString *)kCGImageSourceTypeIdentifierHint : imageUTType});
+        _incremental = YES;
+        CGFloat scale = 1;
+        NSNumber *scaleFactor = options[SDImageCoderDecodeScaleFactor];
+        if (scaleFactor != nil) {
+            scale = MAX([scaleFactor doubleValue], 1);
+        }
+        _scale = scale;
+        CGSize thumbnailSize = CGSizeZero;
+        NSValue *thumbnailSizeValue = options[SDImageCoderDecodeThumbnailPixelSize];
+        if (thumbnailSizeValue != nil) {
+    #if SD_MAC
+            thumbnailSize = thumbnailSizeValue.sizeValue;
+    #else
+            thumbnailSize = thumbnailSizeValue.CGSizeValue;
+    #endif
+        }
+        _thumbnailSize = thumbnailSize;
+        BOOL preserveAspectRatio = YES;
+        NSNumber *preserveAspectRatioValue = options[SDImageCoderDecodePreserveAspectRatio];
+        if (preserveAspectRatioValue != nil) {
+            preserveAspectRatio = preserveAspectRatioValue.boolValue;
+        }
+        _preserveAspectRatio = preserveAspectRatio;
+        NSUInteger limitBytes = 0;
+        NSNumber *limitBytesValue = options[SDImageCoderDecodeScaleDownLimitBytes];
+        if (limitBytesValue != nil) {
+            limitBytes = limitBytesValue.unsignedIntegerValue;
+        }
+        _limitBytes = limitBytes;
+        BOOL lazyDecode = NO; // Defaults NO for animated image coder
+        NSNumber *lazyDecodeValue = options[SDImageCoderDecodeUseLazyDecoding];
+        if (lazyDecodeValue != nil) {
+            lazyDecode = lazyDecodeValue.boolValue;
+        }
+        _lazyDecode = lazyDecode;
+
+        _decodeToHDR = [options[SDImageCoderDecodeToHDR] boolValue];
+        
+        SD_LOCK_INIT(_lock);
+#if SD_UIKIT
+        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didReceiveMemoryWarning:) name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
+#endif
+    }
+    return self;
+}
+
+- (void)updateIncrementalData:(NSData *)data finished:(BOOL)finished {
+    NSCParameterAssert(_incremental);
+    if (_finished) {
+        return;
+    }
+    // The following code is from http://www.cocoaintheshell.com/2011/05/progressive-images-download-imageio/
+    // Thanks to the author @Nyx0uf
+
+    // Lock before updating state and the image source to prevent concurrent access from the frame fetch queue.
+    // CGImageSource is not thread-safe for simultaneous read+write.
+    // _imageData and _finished must be set inside the lock so readers cannot observe
+    // _finished == YES while _imageSource still has old data.
+    SD_LOCK(_lock);
+    _imageData = data;
+    _finished = finished;
+
+    // Update the data source, we must pass ALL the data, not just the new bytes
+    CGImageSourceUpdateData(_imageSource, (__bridge CFDataRef)data, finished);
+
+    if (_width + _height == 0) {
+        CFDictionaryRef properties = CGImageSourceCopyPropertiesAtIndex(_imageSource, 0, NULL);
+        if (properties) {
+            CFTypeRef val = CFDictionaryGetValue(properties, kCGImagePropertyPixelHeight);
+            if (val) CFNumberGetValue(val, kCFNumberLongType, &_height);
+            val = CFDictionaryGetValue(properties, kCGImagePropertyPixelWidth);
+            if (val) CFNumberGetValue(val, kCFNumberLongType, &_width);
+            CFRelease(properties);
+        }
+    }
+
+    // For animated image progressive decoding because the frame count and duration may be changed.
+    [self scanAndCheckFramesValidWithImageSource:_imageSource];
+
+    // Scale down to limit bytes if need
+    if (_limitBytes > 0) {
+        // Hack since ImageIO public API (not CGImageDecompressor/CMPhoto) always return back RGBA8888 CGImage
+        CGSize imageSize = CGSizeMake(_width, _height);
+        CGSize framePixelSize = [SDImageCoderHelper scaledSizeWithImageSize:imageSize limitBytes:_limitBytes bytesPerPixel:4 frameCount:_frameCount];
+        // Override thumbnail size
+        _thumbnailSize = framePixelSize;
+        _preserveAspectRatio = YES;
+    }
+
+    SD_UNLOCK(_lock);
+}
+
+- (UIImage *)incrementalDecodedImageWithOptions:(SDImageCoderOptions *)options {
+    NSCParameterAssert(_incremental);
+    UIImage *image;
+    
+    // Create the image
+    CGFloat scale = _scale;
+    NSNumber *scaleFactor = options[SDImageCoderDecodeScaleFactor];
+    if (scaleFactor != nil) {
+        scale = MAX([scaleFactor doubleValue], 1);
+    }
+    SD_LOCK(_lock);
+    if (_width + _height > 0) {
+        image = [self.class createFrameAtIndex:0 source:_imageSource scale:scale preserveAspectRatio:_preserveAspectRatio thumbnailSize:_thumbnailSize lazyDecode:_lazyDecode animatedImage:NO decodeToHDR:_finished ? _decodeToHDR : NO];
+    }
+    SD_UNLOCK(_lock);
+    if (image) {
+        image.sd_imageFormat = self.class.imageFormat;
+    }
+    
+    return image;
+}
+
+#pragma mark - Encode
+- (BOOL)canEncodeToFormat:(SDImageFormat)format {
+    return (format == self.class.imageFormat);
+}
+
+- (NSData *)encodedDataWithImage:(UIImage *)image format:(SDImageFormat)format options:(nullable SDImageCoderOptions *)options {
+    if (!image) {
+        return nil;
+    }
+    if (format != self.class.imageFormat) {
+        return nil;
+    }
+    
+    NSArray<SDImageFrame *> *frames = [SDImageCoderHelper framesFromAnimatedImage:image];
+    if (!frames || frames.count == 0) {
+        SDImageFrame *frame = [SDImageFrame frameWithImage:image duration:0];
+        frames = @[frame];
+    }
+    return [self encodedDataWithFrames:frames loopCount:image.sd_imageLoopCount format:format options:options];
+}
+
+- (NSData *)encodedDataWithFrames:(NSArray<SDImageFrame *> *)frames loopCount:(NSUInteger)loopCount format:(SDImageFormat)format options:(SDImageCoderOptions *)options {
+    UIImage *image = frames.firstObject.image; // Primary image
+    if (!image) {
+        return nil;
+    }
+    CGImageRef imageRef = image.CGImage;
+    if (!imageRef) {
+        // Earily return, supports CGImage only
+        return nil;
+    }
+    BOOL onlyEncodeOnce = [options[SDImageCoderEncodeFirstFrameOnly] boolValue] || frames.count <= 1;
+    
+    NSMutableData *imageData = [NSMutableData data];
+    NSString *imageUTType;
+    if (onlyEncodeOnce) {
+        imageUTType = self.class.imageUTType;
+    } else {
+        imageUTType = self.class.animatedImageUTType;
+    }
+    
+    // Create an image destination. Animated Image does not support EXIF image orientation TODO
+    // The `CGImageDestinationCreateWithData` will log a warning when count is 0, use 1 instead.
+    CGImageDestinationRef imageDestination = CGImageDestinationCreateWithData((__bridge CFMutableDataRef)imageData, (__bridge CFStringRef)imageUTType, frames.count ?: 1, NULL);
+    if (!imageDestination) {
+        // Handle failure.
+        return nil;
+    }
+    NSMutableDictionary *properties = [NSMutableDictionary dictionary];
+#if SD_UIKIT || SD_WATCH
+    CGImagePropertyOrientation exifOrientation = [SDImageCoderHelper exifOrientationFromImageOrientation:image.imageOrientation];
+#else
+    CGImagePropertyOrientation exifOrientation = kCGImagePropertyOrientationUp;
+#endif
+    if (exifOrientation != kCGImagePropertyOrientationUp) {
+        properties[(__bridge NSString *)kCGImagePropertyOrientation] = @(exifOrientation);
+    }
+    // Encoding Options
+    double compressionQuality = 1;
+    if (options[SDImageCoderEncodeCompressionQuality]) {
+        compressionQuality = [options[SDImageCoderEncodeCompressionQuality] doubleValue];
+    }
+    properties[(__bridge NSString *)kCGImageDestinationLossyCompressionQuality] = @(compressionQuality);
+    CGColorRef backgroundColor = [options[SDImageCoderEncodeBackgroundColor] CGColor];
+    if (backgroundColor) {
+        properties[(__bridge NSString *)kCGImageDestinationBackgroundColor] = (__bridge id)(backgroundColor);
+    }
+    CGSize maxPixelSize = CGSizeZero;
+    NSValue *maxPixelSizeValue = options[SDImageCoderEncodeMaxPixelSize];
+    if (maxPixelSizeValue != nil) {
+#if SD_MAC
+        maxPixelSize = maxPixelSizeValue.sizeValue;
+#else
+        maxPixelSize = maxPixelSizeValue.CGSizeValue;
+#endif
+    }
+    // HDR Encoding
+    NSUInteger encodeToHDR = 0;
+    if (options[SDImageCoderEncodeToHDR]) {
+        encodeToHDR = [options[SDImageCoderEncodeToHDR] unsignedIntegerValue];
+    }
+    if (@available(macOS 15, iOS 18, tvOS 18, watchOS 11, *)) {
+        if (encodeToHDR == SDImageHDRTypeISOHDR) {
+            properties[kSDCGImageDestinationEncodeRequest] = kSDCGImageDestinationEncodeToISOHDR;
+        } else if (encodeToHDR == SDImageHDRTypeISOGainMap) {
+            properties[kSDCGImageDestinationEncodeRequest] = kSDCGImageDestinationEncodeToISOGainmap;
+        } else {
+            properties[kSDCGImageDestinationEncodeRequest] = kSDCGImageDestinationEncodeToSDR;
+        }
+    }
+    
+    CGFloat pixelWidth = (CGFloat)CGImageGetWidth(imageRef);
+    CGFloat pixelHeight = (CGFloat)CGImageGetHeight(imageRef);
+    CGFloat finalPixelSize = 0;
+    BOOL encodeFullImage = maxPixelSize.width == 0 || maxPixelSize.height == 0 || pixelWidth == 0 || pixelHeight == 0 || (pixelWidth <= maxPixelSize.width && pixelHeight <= maxPixelSize.height);
+    if (!encodeFullImage) {
+        // Thumbnail Encoding
+        CGFloat pixelRatio = pixelWidth / pixelHeight;
+        CGFloat maxPixelSizeRatio = maxPixelSize.width / maxPixelSize.height;
+        if (pixelRatio > maxPixelSizeRatio) {
+            finalPixelSize = MAX(maxPixelSize.width, maxPixelSize.width / pixelRatio);
+        } else {
+            finalPixelSize = MAX(maxPixelSize.height, maxPixelSize.height * pixelRatio);
+        }
+        properties[(__bridge NSString *)kCGImageDestinationImageMaxPixelSize] = @(finalPixelSize);
+    }
+    NSUInteger maxFileSize = [options[SDImageCoderEncodeMaxFileSize] unsignedIntegerValue];
+    if (maxFileSize > 0) {
+        properties[kSDCGImageDestinationRequestedFileSize] = @(maxFileSize);
+        // Remove the quality if we have file size limit
+        properties[(__bridge NSString *)kCGImageDestinationLossyCompressionQuality] = nil;
+    }
+    BOOL embedThumbnail = NO;
+    if (options[SDImageCoderEncodeEmbedThumbnail]) {
+        embedThumbnail = [options[SDImageCoderEncodeEmbedThumbnail] boolValue];
+    }
+    properties[(__bridge NSString *)kCGImageDestinationEmbedThumbnail] = @(embedThumbnail);
+    
+    if (onlyEncodeOnce) {
+        // for static single images
+        CGImageDestinationAddImage(imageDestination, imageRef, (__bridge CFDictionaryRef)properties);
+    } else {
+        // for animated images
+        NSDictionary *containerProperties = @{
+            self.class.dictionaryProperty: @{self.class.loopCountProperty : @(loopCount)}
+        };
+        // container level properties (applies for `CGImageDestinationSetProperties`, not individual frames)
+        CGImageDestinationSetProperties(imageDestination, (__bridge CFDictionaryRef)containerProperties);
+        
+        for (size_t i = 0; i < frames.count; i++) {
+            SDImageFrame *frame = frames[i];
+            NSTimeInterval frameDuration = frame.duration;
+            CGImageRef frameImageRef = frame.image.CGImage;
+            properties[self.class.dictionaryProperty] = @{self.class.delayTimeProperty : @(frameDuration)};
+            CGImageDestinationAddImage(imageDestination, frameImageRef, (__bridge CFDictionaryRef)properties);
+        }
+    }
+    // Finalize the destination.
+    if (CGImageDestinationFinalize(imageDestination) == NO) {
+        // Handle failure.
+        imageData = nil;
+    }
+    
+    CFRelease(imageDestination);
+    
+    // In some beta version, ImageIO `CGImageDestinationFinalize` returns success, but the data buffer is 0 bytes length.
+    if (imageData.length == 0) {
+        return nil;
+    }
+    
+    return [imageData copy];
+}
+
+#pragma mark - SDAnimatedImageCoder
+- (nullable instancetype)initWithAnimatedImageData:(nullable NSData *)data options:(nullable SDImageCoderOptions *)options {
+    if (!data) {
+        return nil;
+    }
+    self = [super init];
+    if (self) {
+        CGImageSourceRef imageSource = CGImageSourceCreateWithData((__bridge CFDataRef)data, NULL);
+        if (!imageSource) {
+            return nil;
+        }
+        BOOL framesValid = [self scanAndCheckFramesValidWithImageSource:imageSource];
+        if (!framesValid) {
+            CFRelease(imageSource);
+            return nil;
+        }
+        CGFloat scale = 1;
+        NSNumber *scaleFactor = options[SDImageCoderDecodeScaleFactor];
+        if (scaleFactor != nil) {
+            scale = MAX([scaleFactor doubleValue], 1);
+        }
+        _scale = scale;
+        CGSize thumbnailSize = CGSizeZero;
+        NSValue *thumbnailSizeValue = options[SDImageCoderDecodeThumbnailPixelSize];
+        if (thumbnailSizeValue != nil) {
+    #if SD_MAC
+            thumbnailSize = thumbnailSizeValue.sizeValue;
+    #else
+            thumbnailSize = thumbnailSizeValue.CGSizeValue;
+    #endif
+        }
+        _thumbnailSize = thumbnailSize;
+        BOOL preserveAspectRatio = YES;
+        NSNumber *preserveAspectRatioValue = options[SDImageCoderDecodePreserveAspectRatio];
+        if (preserveAspectRatioValue != nil) {
+            preserveAspectRatio = preserveAspectRatioValue.boolValue;
+        }
+        _preserveAspectRatio = preserveAspectRatio;
+        NSUInteger limitBytes = 0;
+        NSNumber *limitBytesValue = options[SDImageCoderDecodeScaleDownLimitBytes];
+        if (limitBytesValue != nil) {
+            limitBytes = limitBytesValue.unsignedIntegerValue;
+        }
+        _limitBytes = limitBytes;
+        // Parse the image properties
+        NSDictionary *properties = (__bridge_transfer NSDictionary *)CGImageSourceCopyPropertiesAtIndex(imageSource, 0, NULL);
+        _width = [properties[(__bridge NSString *)kCGImagePropertyPixelWidth] doubleValue];
+        _height = [properties[(__bridge NSString *)kCGImagePropertyPixelHeight] doubleValue];
+        // Scale down to limit bytes if need
+        if (_limitBytes > 0) {
+            // Hack since ImageIO public API (not CGImageDecompressor/CMPhoto) always return back RGBA8888 CGImage
+            CGSize imageSize = CGSizeMake(_width, _height);
+            CGSize framePixelSize = [SDImageCoderHelper scaledSizeWithImageSize:imageSize limitBytes:_limitBytes bytesPerPixel:4 frameCount:_frameCount];
+            // Override thumbnail size
+            _thumbnailSize = framePixelSize;
+            _preserveAspectRatio = YES;
+        }
+        BOOL lazyDecode = NO; // Defaults NO for animated image coder
+        NSNumber *lazyDecodeValue = options[SDImageCoderDecodeUseLazyDecoding];
+        if (lazyDecodeValue != nil) {
+            lazyDecode = lazyDecodeValue.boolValue;
+        }
+        _lazyDecode = lazyDecode;
+
+        _decodeToHDR = [options[SDImageCoderDecodeToHDR] boolValue];
+        
+        _imageSource = imageSource;
+        _imageData = data;
+#if SD_UIKIT
+        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didReceiveMemoryWarning:) name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
+#endif
+    }
+    return self;
+}
+
+- (BOOL)scanAndCheckFramesValidWithImageSource:(CGImageSourceRef)imageSource {
+    if (!imageSource) {
+        return NO;
+    }
+    NSUInteger frameCount = CGImageSourceGetCount(imageSource);
+    NSUInteger loopCount = [self.class imageLoopCountWithSource:imageSource];
+    _loopCount = loopCount;
+    
+    NSMutableArray<SDImageIOCoderFrame *> *frames = [NSMutableArray arrayWithCapacity:frameCount];
+    for (size_t i = 0; i < frameCount; i++) {
+        SDImageIOCoderFrame *frame = [[SDImageIOCoderFrame alloc] init];
+        frame.index = i;
+        frame.duration = [self.class frameDurationAtIndex:i source:imageSource];
+        [frames addObject:frame];
+    }
+    if (frames.count != frameCount) {
+        // frames not match, do not override current value
+        return NO;
+    }
+    
+    _frameCount = frameCount;
+    _frames = [frames copy];
+    
+    return YES;
+}
+
+- (NSData *)animatedImageData {
+    return _imageData;
+}
+
+- (NSUInteger)animatedImageLoopCount {
+    return _loopCount;
+}
+
+- (NSUInteger)animatedImageFrameCount {
+    return _frameCount;
+}
+
+- (NSTimeInterval)animatedImageDurationAtIndex:(NSUInteger)index {
+    NSTimeInterval duration;
+    // Incremental Animation decoding may update frames when new bytes available
+    // Which should use lock to ensure frame count and frames match, ensure atomic logic
+    if (_incremental) {
+        SD_LOCK(_lock);
+        if (index >= _frames.count) {
+            SD_UNLOCK(_lock);
+            return 0;
+        }
+        duration = _frames[index].duration;
+        SD_UNLOCK(_lock);
+    } else {
+        if (index >= _frames.count) {
+            return 0;
+        }
+        duration = _frames[index].duration;
+    }
+    return duration;
+}
+
+- (UIImage *)animatedImageFrameAtIndex:(NSUInteger)index {
+    UIImage *image;
+    // Incremental Animation decoding may update frames when new bytes available
+    // Which should use lock to ensure frame count and frames match, ensure atomic logic
+    if (_incremental) {
+        SD_LOCK(_lock);
+        if (index >= _frames.count) {
+            SD_UNLOCK(_lock);
+            return nil;
+        }
+        image = [self safeAnimatedImageFrameAtIndex:index];
+        SD_UNLOCK(_lock);
+    } else {
+        if (index >= _frames.count) {
+            return nil;
+        }
+        image = [self safeAnimatedImageFrameAtIndex:index];
+    }
+    return image;
+}
+
+- (UIImage *)safeAnimatedImageFrameAtIndex:(NSUInteger)index {
+    UIImage *image = [self.class createFrameAtIndex:index source:_imageSource scale:_scale preserveAspectRatio:_preserveAspectRatio thumbnailSize:_thumbnailSize lazyDecode:_lazyDecode animatedImage:YES decodeToHDR:!_incremental || _finished ? _decodeToHDR : NO];
+    if (!image) {
+        return nil;
+    }
+    image.sd_imageFormat = self.class.imageFormat;
+    return image;
+}
+
+@end
+
diff --git a/SDWebImage/SDWebImageImageIOCoder.h b/SDWebImage/Core/SDImageIOCoder.h
similarity index 79%
rename from SDWebImage/SDWebImageImageIOCoder.h
rename to SDWebImage/Core/SDImageIOCoder.h
index 04f68fb9f..98682ed68 100644
--- a/SDWebImage/SDWebImageImageIOCoder.h
+++ b/SDWebImage/Core/SDImageIOCoder.h
@@ -7,14 +7,14 @@
  */
 
 #import <Foundation/Foundation.h>
-#import "SDWebImageCoder.h"
+#import "SDImageCoder.h"
 
 /**
  Built in coder that supports PNG, JPEG, TIFF, includes support for progressive decoding.
  
  GIF
  Also supports static GIF (meaning will only handle the 1st frame).
- For a full GIF support, we recommend `FLAnimatedImage` or our less performant `SDWebImageGIFCoder`
+ For a full GIF support, we recommend `SDAnimatedImageView` to keep both CPU and memory balanced.
  
  HEIC
  This coder also supports HEIC format because ImageIO supports it natively. But it depends on the system capabilities, so it won't work on all devices, see: https://devstreaming-cdn.apple.com/videos/wwdc/2017/511tj33587vdhds/511/511_working_with_heif_and_hevc.pdf
@@ -23,8 +23,8 @@
  Encode(Software): macOS 10.13
  Encode(Hardware): !Simulator && ((iOS 11 && A10FusionChip) || (macOS 10.13 && 6thGenerationIntelCPU))
  */
-@interface SDWebImageImageIOCoder : NSObject <SDWebImageProgressiveCoder>
+@interface SDImageIOCoder : NSObject <SDProgressiveImageCoder>
 
-+ (nonnull instancetype)sharedCoder;
+@property (nonatomic, class, readonly, nonnull) SDImageIOCoder *sharedCoder;
 
 @end
diff --git a/SDWebImage/Core/SDImageIOCoder.m b/SDWebImage/Core/SDImageIOCoder.m
new file mode 100644
index 000000000..5606c46cd
--- /dev/null
+++ b/SDWebImage/Core/SDImageIOCoder.m
@@ -0,0 +1,458 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDImageIOCoder.h"
+#import "SDImageCoderHelper.h"
+#import "NSImage+Compatibility.h"
+#import "UIImage+Metadata.h"
+#import "SDImageGraphics.h"
+#import "SDImageIOAnimatedCoderInternal.h"
+
+#import <ImageIO/ImageIO.h>
+#import <CoreServices/CoreServices.h>
+
+// Specify File Size for lossy format encoding, like JPEG
+static NSString * kSDCGImageDestinationRequestedFileSize = @"kCGImageDestinationRequestedFileSize";
+// Support Xcode 15 SDK, use raw value instead of symbol
+static NSString * kSDCGImageDestinationEncodeRequest = @"kCGImageDestinationEncodeRequest";
+static NSString * kSDCGImageDestinationEncodeToSDR = @"kCGImageDestinationEncodeToSDR";
+static NSString * kSDCGImageDestinationEncodeToISOHDR = @"kCGImageDestinationEncodeToISOHDR";
+static NSString * kSDCGImageDestinationEncodeToISOGainmap = @"kCGImageDestinationEncodeToISOGainmap";
+
+
+@implementation SDImageIOCoder {
+    size_t _width, _height;
+    CGImagePropertyOrientation _orientation;
+    CGImageSourceRef _imageSource;
+    CGFloat _scale;
+    BOOL _finished;
+    BOOL _preserveAspectRatio;
+    CGSize _thumbnailSize;
+    BOOL _lazyDecode;
+    BOOL _decodeToHDR;
+}
+
+#if SD_IMAGEIO_HDR_ENCODING
++ (void)initialize {
+    if (@available(macOS 15, iOS 18, tvOS 18, watchOS 11, *)) {
+        // Use SDK instead of raw value
+        kSDCGImageDestinationEncodeRequest = (__bridge NSString *)kCGImageDestinationEncodeRequest;
+        kSDCGImageDestinationEncodeToSDR = (__bridge NSString *)kCGImageDestinationEncodeToSDR;
+        kSDCGImageDestinationEncodeToISOHDR = (__bridge NSString *)kCGImageDestinationEncodeToISOHDR;
+        kSDCGImageDestinationEncodeToISOGainmap = (__bridge NSString *)kCGImageDestinationEncodeToISOGainmap;
+    }
+}
+#endif
+
+- (void)dealloc {
+    if (_imageSource) {
+        CFRelease(_imageSource);
+        _imageSource = NULL;
+    }
+#if SD_UIKIT
+    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
+#endif
+}
+
+- (void)didReceiveMemoryWarning:(NSNotification *)notification
+{
+    if (_imageSource) {
+        CGImageSourceRemoveCacheAtIndex(_imageSource, 0);
+    }
+}
+
++ (instancetype)sharedCoder {
+    static SDImageIOCoder *coder;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        coder = [[SDImageIOCoder alloc] init];
+    });
+    return coder;
+}
+
+#pragma mark - Bitmap PDF representation
++ (UIImage *)createBitmapPDFWithData:(nonnull NSData *)data pageNumber:(NSUInteger)pageNumber targetSize:(CGSize)targetSize preserveAspectRatio:(BOOL)preserveAspectRatio {
+    NSParameterAssert(data);
+    UIImage *image;
+    
+    CGDataProviderRef provider = CGDataProviderCreateWithCFData((__bridge CFDataRef)data);
+    if (!provider) {
+        return nil;
+    }
+    CGPDFDocumentRef document = CGPDFDocumentCreateWithProvider(provider);
+    CGDataProviderRelease(provider);
+    if (!document) {
+        return nil;
+    }
+    
+    // `CGPDFDocumentGetPage` page number is 1-indexed.
+    CGPDFPageRef page = CGPDFDocumentGetPage(document, pageNumber + 1);
+    if (!page) {
+        CGPDFDocumentRelease(document);
+        return nil;
+    }
+    
+    CGPDFBox box = kCGPDFMediaBox;
+    CGRect rect = CGPDFPageGetBoxRect(page, box);
+    CGRect targetRect = rect;
+    if (!CGSizeEqualToSize(targetSize, CGSizeZero)) {
+        targetRect = CGRectMake(0, 0, targetSize.width, targetSize.height);
+    }
+    
+    CGFloat xRatio = targetRect.size.width / rect.size.width;
+    CGFloat yRatio = targetRect.size.height / rect.size.height;
+    CGFloat xScale = preserveAspectRatio ? MIN(xRatio, yRatio) : xRatio;
+    CGFloat yScale = preserveAspectRatio ? MIN(xRatio, yRatio) : yRatio;
+    
+    // `CGPDFPageGetDrawingTransform` will only scale down, but not scale up, so we need calculate the actual scale again
+    CGRect drawRect = CGRectMake( 0, 0, targetRect.size.width / xScale, targetRect.size.height / yScale);
+    CGAffineTransform scaleTransform = CGAffineTransformMakeScale(xScale, yScale);
+    CGAffineTransform transform = CGPDFPageGetDrawingTransform(page, box, drawRect, 0, preserveAspectRatio);
+    
+    SDGraphicsBeginImageContextWithOptions(targetRect.size, NO, 0);
+    CGContextRef context = SDGraphicsGetCurrentContext();
+    
+#if SD_UIKIT || SD_WATCH
+    // Core Graphics coordinate system use the bottom-left, UIKit use the flipped one
+    CGContextTranslateCTM(context, 0, targetRect.size.height);
+    CGContextScaleCTM(context, 1, -1);
+#endif
+    
+    CGContextConcatCTM(context, scaleTransform);
+    CGContextConcatCTM(context, transform);
+    
+    CGContextDrawPDFPage(context, page);
+    
+    image = SDGraphicsGetImageFromCurrentImageContext();
+    SDGraphicsEndImageContext();
+    
+    CGPDFDocumentRelease(document);
+    
+    return image;
+}
+
+#pragma mark - Decode
+- (BOOL)canDecodeFromData:(nullable NSData *)data {
+    return YES;
+}
+
+- (UIImage *)decodedImageWithData:(NSData *)data options:(nullable SDImageCoderOptions *)options {
+    if (!data) {
+        return nil;
+    }
+    CGFloat scale = 1;
+    NSNumber *scaleFactor = options[SDImageCoderDecodeScaleFactor];
+    if (scaleFactor != nil) {
+        scale = MAX([scaleFactor doubleValue], 1) ;
+    }
+    
+    CGSize thumbnailSize = CGSizeZero;
+    NSValue *thumbnailSizeValue = options[SDImageCoderDecodeThumbnailPixelSize];
+    if (thumbnailSizeValue != nil) {
+#if SD_MAC
+        thumbnailSize = thumbnailSizeValue.sizeValue;
+#else
+        thumbnailSize = thumbnailSizeValue.CGSizeValue;
+#endif
+    }
+    
+    BOOL preserveAspectRatio = YES;
+    NSNumber *preserveAspectRatioValue = options[SDImageCoderDecodePreserveAspectRatio];
+    if (preserveAspectRatioValue != nil) {
+        preserveAspectRatio = preserveAspectRatioValue.boolValue;
+    }
+    
+    // Check vector format
+    if ([NSData sd_imageFormatForImageData:data] == SDImageFormatPDF) {
+        // History before iOS 16, ImageIO can decode PDF with rasterization size, but can't ever :(
+        // So, use CoreGraphics to decode PDF (copy code from SDWebImagePDFCoder, may do refactor in the future)
+        UIImage *image;
+        NSUInteger pageNumber = 0; // Still use first page, may added options is user want
+#if SD_MAC
+        // If don't use thumbnail, prefers the built-in generation of vector image
+        // macOS's `NSImage` supports PDF built-in rendering
+        if (thumbnailSize.width == 0 || thumbnailSize.height == 0) {
+            NSPDFImageRep *imageRep = [[NSPDFImageRep alloc] initWithData:data];
+            if (imageRep) {
+                imageRep.currentPage = pageNumber;
+                image = [[NSImage alloc] initWithSize:imageRep.size];
+                [image addRepresentation:imageRep];
+                image.sd_imageFormat = SDImageFormatPDF;
+                return image;
+            }
+        }
+#endif
+        image = [self.class createBitmapPDFWithData:data pageNumber:pageNumber targetSize:thumbnailSize preserveAspectRatio:preserveAspectRatio];
+        image.sd_imageFormat = SDImageFormatPDF;
+        return image;
+    }
+    
+    BOOL lazyDecode = YES; // Defaults YES for static image coder
+    NSNumber *lazyDecodeValue = options[SDImageCoderDecodeUseLazyDecoding];
+    if (lazyDecodeValue != nil) {
+        lazyDecode = lazyDecodeValue.boolValue;
+    }
+    
+    BOOL decodeToHDR = [options[SDImageCoderDecodeToHDR] boolValue];
+    
+    NSString *typeIdentifierHint = options[SDImageCoderDecodeTypeIdentifierHint];
+    if (!typeIdentifierHint) {
+        // Check file extension and convert to UTI, from: https://stackoverflow.com/questions/1506251/getting-an-uniform-type-identifier-for-a-given-extension
+        NSString *fileExtensionHint = options[SDImageCoderDecodeFileExtensionHint];
+        if (fileExtensionHint) {
+            typeIdentifierHint = (__bridge_transfer NSString *)UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, (__bridge CFStringRef)fileExtensionHint, kUTTypeImage);
+            // Ignore dynamic UTI
+            if (UTTypeIsDynamic((__bridge CFStringRef)typeIdentifierHint)) {
+                typeIdentifierHint = nil;
+            }
+        }
+    } else if ([typeIdentifierHint isEqual:NSNull.null]) {
+        // Hack if user don't want to imply file extension
+        typeIdentifierHint = nil;
+    }
+    
+    NSDictionary *creatingOptions = nil;
+    if (typeIdentifierHint) {
+        creatingOptions = @{(__bridge NSString *)kCGImageSourceTypeIdentifierHint : typeIdentifierHint};
+    }
+    CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef)data, (__bridge CFDictionaryRef)creatingOptions);
+    if (!source) {
+        // Try again without UTType hint, the call site from user may provide the wrong UTType
+        source = CGImageSourceCreateWithData((__bridge CFDataRef)data, nil);
+    }
+    if (!source) {
+        return nil;
+    }
+    
+    CFStringRef uttype = CGImageSourceGetType(source);
+    SDImageFormat imageFormat = [NSData sd_imageFormatFromUTType:uttype];
+    
+    UIImage *image = [SDImageIOAnimatedCoder createFrameAtIndex:0 source:source scale:scale preserveAspectRatio:preserveAspectRatio thumbnailSize:thumbnailSize lazyDecode:lazyDecode animatedImage:NO decodeToHDR:decodeToHDR];
+    CFRelease(source);
+    
+    image.sd_imageFormat = imageFormat;
+    return image;
+}
+
+#pragma mark - Progressive Decode
+
+- (BOOL)canIncrementalDecodeFromData:(NSData *)data {
+    return [self canDecodeFromData:data];
+}
+
+- (instancetype)initIncrementalWithOptions:(nullable SDImageCoderOptions *)options {
+    self = [super init];
+    if (self) {
+        _imageSource = CGImageSourceCreateIncremental(NULL);
+        CGFloat scale = 1;
+        NSNumber *scaleFactor = options[SDImageCoderDecodeScaleFactor];
+        if (scaleFactor != nil) {
+            scale = MAX([scaleFactor doubleValue], 1);
+        }
+        _scale = scale;
+        CGSize thumbnailSize = CGSizeZero;
+        NSValue *thumbnailSizeValue = options[SDImageCoderDecodeThumbnailPixelSize];
+        if (thumbnailSizeValue != nil) {
+    #if SD_MAC
+            thumbnailSize = thumbnailSizeValue.sizeValue;
+    #else
+            thumbnailSize = thumbnailSizeValue.CGSizeValue;
+    #endif
+        }
+        _thumbnailSize = thumbnailSize;
+        BOOL preserveAspectRatio = YES;
+        NSNumber *preserveAspectRatioValue = options[SDImageCoderDecodePreserveAspectRatio];
+        if (preserveAspectRatioValue != nil) {
+            preserveAspectRatio = preserveAspectRatioValue.boolValue;
+        }
+        _preserveAspectRatio = preserveAspectRatio;
+        BOOL lazyDecode = YES; // Defaults YES for static image coder
+        NSNumber *lazyDecodeValue = options[SDImageCoderDecodeUseLazyDecoding];
+        if (lazyDecodeValue != nil) {
+            lazyDecode = lazyDecodeValue.boolValue;
+        }
+        _lazyDecode = lazyDecode;
+        
+        _decodeToHDR = [options[SDImageCoderDecodeToHDR] boolValue];
+        
+#if SD_UIKIT
+        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didReceiveMemoryWarning:) name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
+#endif
+    }
+    return self;
+}
+
+- (void)updateIncrementalData:(NSData *)data finished:(BOOL)finished {
+    if (_finished) {
+        return;
+    }
+    _finished = finished;
+    
+    // The following code is from http://www.cocoaintheshell.com/2011/05/progressive-images-download-imageio/
+    // Thanks to the author @Nyx0uf
+    
+    // Update the data source, we must pass ALL the data, not just the new bytes
+    CGImageSourceUpdateData(_imageSource, (__bridge CFDataRef)data, finished);
+    
+    if (_width + _height == 0) {
+        CFDictionaryRef properties = CGImageSourceCopyPropertiesAtIndex(_imageSource, 0, NULL);
+        if (properties) {
+            NSInteger orientationValue = 1;
+            CFTypeRef val = CFDictionaryGetValue(properties, kCGImagePropertyPixelHeight);
+            if (val) CFNumberGetValue(val, kCFNumberLongType, &_height);
+            val = CFDictionaryGetValue(properties, kCGImagePropertyPixelWidth);
+            if (val) CFNumberGetValue(val, kCFNumberLongType, &_width);
+            val = CFDictionaryGetValue(properties, kCGImagePropertyOrientation);
+            if (val) CFNumberGetValue(val, kCFNumberNSIntegerType, &orientationValue);
+            CFRelease(properties);
+            
+            // When we draw to Core Graphics, we lose orientation information,
+            // which means the image below born of initWithCGIImage will be
+            // oriented incorrectly sometimes. (Unlike the image born of initWithData
+            // in didCompleteWithError.) So save it here and pass it on later.
+            _orientation = (CGImagePropertyOrientation)orientationValue;
+        }
+    }
+}
+
+- (UIImage *)incrementalDecodedImageWithOptions:(SDImageCoderOptions *)options {
+    UIImage *image;
+    
+    if (_width + _height > 0) {
+        // Create the image
+        CGFloat scale = _scale;
+        NSNumber *scaleFactor = options[SDImageCoderDecodeScaleFactor];
+        if (scaleFactor != nil) {
+            scale = MAX([scaleFactor doubleValue], 1);
+        }
+        image = [SDImageIOAnimatedCoder createFrameAtIndex:0 source:_imageSource scale:scale preserveAspectRatio:_preserveAspectRatio thumbnailSize:_thumbnailSize lazyDecode:_lazyDecode animatedImage:NO decodeToHDR:_finished ? _decodeToHDR : NO];
+        if (image) {
+            CFStringRef uttype = CGImageSourceGetType(_imageSource);
+            image.sd_imageFormat = [NSData sd_imageFormatFromUTType:uttype];
+        }
+    }
+    
+    return image;
+}
+
+#pragma mark - Encode
+- (BOOL)canEncodeToFormat:(SDImageFormat)format {
+    return YES;
+}
+
+- (NSData *)encodedDataWithImage:(UIImage *)image format:(SDImageFormat)format options:(nullable SDImageCoderOptions *)options {
+    if (!image) {
+        return nil;
+    }
+    CGImageRef imageRef = image.CGImage;
+    if (!imageRef) {
+        // Earily return, supports CGImage only
+        return nil;
+    }
+    if (format == SDImageFormatUndefined) {
+        BOOL hasAlpha = [SDImageCoderHelper CGImageContainsAlpha:imageRef];
+        if (hasAlpha) {
+            format = SDImageFormatPNG;
+        } else {
+            format = SDImageFormatJPEG;
+        }
+    }
+
+    NSMutableData *imageData = [NSMutableData data];
+    CFStringRef imageUTType = [NSData sd_UTTypeFromImageFormat:format];
+    
+    // Create an image destination.
+    CGImageDestinationRef imageDestination = CGImageDestinationCreateWithData((__bridge CFMutableDataRef)imageData, imageUTType, 1, NULL);
+    if (!imageDestination) {
+        // Handle failure.
+        return nil;
+    }
+    
+    NSMutableDictionary *properties = [NSMutableDictionary dictionary];
+#if SD_UIKIT || SD_WATCH
+    CGImagePropertyOrientation exifOrientation = [SDImageCoderHelper exifOrientationFromImageOrientation:image.imageOrientation];
+#else
+    CGImagePropertyOrientation exifOrientation = kCGImagePropertyOrientationUp;
+#endif
+    properties[(__bridge NSString *)kCGImagePropertyOrientation] = @(exifOrientation);
+    // Encoding Options
+    double compressionQuality = 1;
+    if (options[SDImageCoderEncodeCompressionQuality]) {
+        compressionQuality = [options[SDImageCoderEncodeCompressionQuality] doubleValue];
+    }
+    properties[(__bridge NSString *)kCGImageDestinationLossyCompressionQuality] = @(compressionQuality);
+    CGColorRef backgroundColor = [options[SDImageCoderEncodeBackgroundColor] CGColor];
+    if (backgroundColor) {
+        properties[(__bridge NSString *)kCGImageDestinationBackgroundColor] = (__bridge id)(backgroundColor);
+    }
+    CGSize maxPixelSize = CGSizeZero;
+    NSValue *maxPixelSizeValue = options[SDImageCoderEncodeMaxPixelSize];
+    if (maxPixelSizeValue != nil) {
+#if SD_MAC
+        maxPixelSize = maxPixelSizeValue.sizeValue;
+#else
+        maxPixelSize = maxPixelSizeValue.CGSizeValue;
+#endif
+    }
+    // HDR Encoding
+    NSUInteger encodeToHDR = 0;
+    if (options[SDImageCoderEncodeToHDR]) {
+        encodeToHDR = [options[SDImageCoderEncodeToHDR] unsignedIntegerValue];
+    }
+    if (@available(macOS 15, iOS 18, tvOS 18, watchOS 11, *)) {
+        if (encodeToHDR == SDImageHDRTypeISOHDR) {
+            properties[kSDCGImageDestinationEncodeRequest] = kSDCGImageDestinationEncodeToISOHDR;
+        } else if (encodeToHDR == SDImageHDRTypeISOGainMap) {
+            properties[kSDCGImageDestinationEncodeRequest] = kSDCGImageDestinationEncodeToISOGainmap;
+        } else {
+            properties[kSDCGImageDestinationEncodeRequest] = kSDCGImageDestinationEncodeToSDR;
+        }
+    }
+    
+    CGFloat pixelWidth = (CGFloat)CGImageGetWidth(imageRef);
+    CGFloat pixelHeight = (CGFloat)CGImageGetHeight(imageRef);
+    CGFloat finalPixelSize = 0;
+    BOOL encodeFullImage = maxPixelSize.width == 0 || maxPixelSize.height == 0 || pixelWidth == 0 || pixelHeight == 0 || (pixelWidth <= maxPixelSize.width && pixelHeight <= maxPixelSize.height);
+    if (!encodeFullImage) {
+        // Thumbnail Encoding
+        CGFloat pixelRatio = pixelWidth / pixelHeight;
+        CGFloat maxPixelSizeRatio = maxPixelSize.width / maxPixelSize.height;
+        if (pixelRatio > maxPixelSizeRatio) {
+            finalPixelSize = MAX(maxPixelSize.width, maxPixelSize.width / pixelRatio);
+        } else {
+            finalPixelSize = MAX(maxPixelSize.height, maxPixelSize.height * pixelRatio);
+        }
+        properties[(__bridge NSString *)kCGImageDestinationImageMaxPixelSize] = @(finalPixelSize);
+    }
+    NSUInteger maxFileSize = [options[SDImageCoderEncodeMaxFileSize] unsignedIntegerValue];
+    if (maxFileSize > 0) {
+        properties[kSDCGImageDestinationRequestedFileSize] = @(maxFileSize);
+        // Remove the quality if we have file size limit
+        properties[(__bridge NSString *)kCGImageDestinationLossyCompressionQuality] = nil;
+    }
+    BOOL embedThumbnail = NO;
+    if (options[SDImageCoderEncodeEmbedThumbnail]) {
+        embedThumbnail = [options[SDImageCoderEncodeEmbedThumbnail] boolValue];
+    }
+    properties[(__bridge NSString *)kCGImageDestinationEmbedThumbnail] = @(embedThumbnail);
+    
+    // Add your image to the destination.
+    CGImageDestinationAddImage(imageDestination, imageRef, (__bridge CFDictionaryRef)properties);
+    
+    // Finalize the destination.
+    if (CGImageDestinationFinalize(imageDestination) == NO) {
+        // Handle failure.
+        imageData = nil;
+    }
+    
+    CFRelease(imageDestination);
+    
+    return [imageData copy];
+}
+
+@end
diff --git a/SDWebImage/Core/SDImageLoader.h b/SDWebImage/Core/SDImageLoader.h
new file mode 100644
index 000000000..62ddc8e58
--- /dev/null
+++ b/SDWebImage/Core/SDImageLoader.h
@@ -0,0 +1,146 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+#import "SDWebImageDefine.h"
+#import "SDWebImageOperation.h"
+#import "SDImageCoder.h"
+
+typedef void(^SDImageLoaderProgressBlock)(NSInteger receivedSize, NSInteger expectedSize, NSURL * _Nullable targetURL);
+typedef void(^SDImageLoaderCompletedBlock)(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished);
+
+#pragma mark - Context Options
+
+/**
+ A `UIImage` instance from `SDWebImageManager` when you specify `SDWebImageRefreshCached` and image cache hit.
+ This can be a hint for image loader to load the image from network and refresh the image from remote location if needed. If the image from remote location does not change, you should call the completion with `SDWebImageErrorCacheNotModified` error. (UIImage)
+ @note If you don't implement `SDWebImageRefreshCached` support, you do not need to care about this context option.
+ */
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextLoaderCachedImage;
+
+#pragma mark - Helper method
+
+/**
+ This is the built-in decoding process for image download from network or local file.
+ @note If you want to implement your custom loader with `requestImageWithURL:options:context:progress:completed:` API, but also want to keep compatible with SDWebImage's behavior, you'd better use this to produce image.
+
+ @param imageData The image data from the network. Should not be nil
+ @param imageURL The image URL from the input. Should not be nil
+ @param options The options arg from the input
+ @param context The context arg from the input
+ @return The decoded image for current image data load from the network
+ */
+FOUNDATION_EXPORT UIImage * _Nullable SDImageLoaderDecodeImageData(NSData * _Nonnull imageData, NSURL * _Nonnull imageURL, SDWebImageOptions options, SDWebImageContext * _Nullable context);
+
+/**
+ This is the built-in decoding process for image progressive download from network. It's used when `SDWebImageProgressiveLoad` option is set. (It's not required when your loader does not support progressive image loading)
+ @note If you want to implement your custom loader with `requestImageWithURL:options:context:progress:completed:` API, but also want to keep compatible with SDWebImage's behavior, you'd better use this to produce image.
+
+ @param imageData The image data from the network so far. Should not be nil
+ @param imageURL The image URL from the input. Should not be nil
+ @param finished Pass NO to specify the download process has not finished. Pass YES when all image data has finished.
+ @param operation The loader operation associated with current progressive download. Why to provide this is because progressive decoding need to store the partial decoded context for each operation to avoid conflict. You should provide the operation from `loadImageWithURL:` method return value.
+ @param options The options arg from the input
+ @param context The context arg from the input
+ @return The decoded progressive image for current image data load from the network
+ */
+FOUNDATION_EXPORT UIImage * _Nullable SDImageLoaderDecodeProgressiveImageData(NSData * _Nonnull imageData, NSURL * _Nonnull imageURL, BOOL finished,  id<SDWebImageOperation> _Nonnull operation, SDWebImageOptions options, SDWebImageContext * _Nullable context);
+
+/**
+ This function get the progressive decoder for current loading operation. If no progressive decoding is happended or decoder is not able to construct, return nil.
+ @return The progressive decoder associated with the loading operation.
+ */
+FOUNDATION_EXPORT id<SDProgressiveImageCoder> _Nullable SDImageLoaderGetProgressiveCoder(id<SDWebImageOperation> _Nonnull operation);
+
+/**
+ This function set the progressive decoder for current loading operation. If no progressive decoding is happended, pass nil.
+ @param progressiveCoder The loading operation to associate the progerssive decoder.
+ */
+FOUNDATION_EXPORT void SDImageLoaderSetProgressiveCoder(id<SDWebImageOperation> _Nonnull operation, id<SDProgressiveImageCoder> _Nullable progressiveCoder);
+
+#pragma mark - SDImageLoader
+
+/**
+ This is the protocol to specify custom image load process. You can create your own class to conform this protocol and use as a image loader to load image from network or any available remote resources defined by yourself.
+ If you want to implement custom loader for image download from network or local file, you just need to concentrate on image data download only. After the download finish, call `SDImageLoaderDecodeImageData` or `SDImageLoaderDecodeProgressiveImageData` to use the built-in decoding process and produce image (Remember to call in the global queue). And finally callback the completion block.
+ If you directly get the image instance using some third-party SDKs, such as image directly from Photos framework. You can process the image data and image instance by yourself without that built-in decoding process. And finally callback the completion block.
+ @note It's your responsibility to load the image in the desired global queue(to avoid block main queue). We do not dispatch these method call in a global queue but just from the call queue (For `SDWebImageManager`, it typically call from the main queue).
+*/
+@protocol SDImageLoader <NSObject>
+
+@required
+/**
+ Whether current image loader supports to load the provide image URL.
+ This will be checked every time a new image request come for loader. If this return NO, we will mark this image load as failed. If return YES, we will start to call `requestImageWithURL:options:context:progress:completed:`.
+
+ @param url The image URL to be loaded.
+ @return YES to continue download, NO to stop download.
+ */
+- (BOOL)canRequestImageForURL:(nullable NSURL *)url API_DEPRECATED_WITH_REPLACEMENT("canRequestImageForURL:options:context:", macos(10.10, API_TO_BE_DEPRECATED), ios(8.0, API_TO_BE_DEPRECATED), tvos(9.0, API_TO_BE_DEPRECATED), watchos(2.0, API_TO_BE_DEPRECATED));
+
+@optional
+/**
+ Whether current image loader supports to load the provide image URL, with associated options and context.
+ This will be checked every time a new image request come for loader. If this return NO, we will mark this image load as failed. If return YES, we will start to call `requestImageWithURL:options:context:progress:completed:`.
+
+ @param url The image URL to be loaded.
+ @param options A mask to specify options to use for this request
+ @param context A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
+ @return YES to continue download, NO to stop download.
+ */
+- (BOOL)canRequestImageForURL:(nullable NSURL *)url
+                      options:(SDWebImageOptions)options
+                      context:(nullable SDWebImageContext *)context;
+
+@required
+/**
+ Load the image and image data with the given URL and return the image data. You're responsible for producing the image instance.
+
+ @param url The URL represent the image. Note this may not be a HTTP URL
+ @param options A mask to specify options to use for this request
+ @param context A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
+ @param progressBlock A block called while image is downloading
+ *                    @note the progress block is executed on a background queue
+ @param completedBlock A block called when operation has been completed.
+ @return An operation which allow the user to cancel the current request.
+ */
+- (nullable id<SDWebImageOperation>)requestImageWithURL:(nullable NSURL *)url
+                                                options:(SDWebImageOptions)options
+                                                context:(nullable SDWebImageContext *)context
+                                               progress:(nullable SDImageLoaderProgressBlock)progressBlock
+                                              completed:(nullable SDImageLoaderCompletedBlock)completedBlock;
+
+
+/**
+ Whether the error from image loader should be marked indeed un-recoverable or not.
+ If this return YES, failed URL which does not using `SDWebImageRetryFailed` will be blocked into black list. Else not.
+
+ @param url The URL represent the image. Note this may not be a HTTP URL
+ @param error The URL's loading error, from previous `requestImageWithURL:options:context:progress:completed:` completedBlock's error.
+ @return Whether to block this url or not. Return YES to mark this URL as failed.
+ */
+- (BOOL)shouldBlockFailedURLWithURL:(nonnull NSURL *)url
+                              error:(nonnull NSError *)error API_DEPRECATED_WITH_REPLACEMENT("shouldBlockFailedURLWithURL:error:options:context:", macos(10.10, API_TO_BE_DEPRECATED), ios(8.0, API_TO_BE_DEPRECATED), tvos(9.0, API_TO_BE_DEPRECATED), watchos(2.0, API_TO_BE_DEPRECATED));
+
+@optional
+/**
+ Whether the error from image loader should be marked indeed un-recoverable or not, with associated options and context.
+ If this return YES, failed URL which does not using `SDWebImageRetryFailed` will be blocked into black list. Else not.
+
+ @param url The URL represent the image. Note this may not be a HTTP URL
+ @param error The URL's loading error, from previous `requestImageWithURL:options:context:progress:completed:` completedBlock's error.
+ @param options A mask to specify options to use for this request
+ @param context A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
+ @return Whether to block this url or not. Return YES to mark this URL as failed.
+ */
+- (BOOL)shouldBlockFailedURLWithURL:(nonnull NSURL *)url
+                              error:(nonnull NSError *)error
+                            options:(SDWebImageOptions)options
+                            context:(nullable SDWebImageContext *)context;
+
+@end
diff --git a/SDWebImage/Core/SDImageLoader.m b/SDWebImage/Core/SDImageLoader.m
new file mode 100644
index 000000000..9c6c26873
--- /dev/null
+++ b/SDWebImage/Core/SDImageLoader.m
@@ -0,0 +1,178 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDImageLoader.h"
+#import "SDWebImageCacheKeyFilter.h"
+#import "SDImageCodersManager.h"
+#import "SDImageCoderHelper.h"
+#import "SDAnimatedImage.h"
+#import "UIImage+Metadata.h"
+#import "SDInternalMacros.h"
+#import "SDImageCacheDefine.h"
+#import "objc/runtime.h"
+
+SDWebImageContextOption const SDWebImageContextLoaderCachedImage = @"loaderCachedImage";
+
+static void * SDImageLoaderProgressiveCoderKey = &SDImageLoaderProgressiveCoderKey;
+
+id<SDProgressiveImageCoder> SDImageLoaderGetProgressiveCoder(id<SDWebImageOperation> operation) {
+    NSCParameterAssert(operation);
+    return objc_getAssociatedObject(operation, SDImageLoaderProgressiveCoderKey);
+}
+
+void SDImageLoaderSetProgressiveCoder(id<SDWebImageOperation> operation, id<SDProgressiveImageCoder> progressiveCoder) {
+    NSCParameterAssert(operation);
+    objc_setAssociatedObject(operation, SDImageLoaderProgressiveCoderKey, progressiveCoder, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+}
+
+UIImage * _Nullable SDImageLoaderDecodeImageData(NSData * _Nonnull imageData, NSURL * _Nonnull imageURL, SDWebImageOptions options, SDWebImageContext * _Nullable context) {
+    NSCParameterAssert(imageData);
+    NSCParameterAssert(imageURL);
+    
+    UIImage *image;
+    id<SDWebImageCacheKeyFilter> cacheKeyFilter = context[SDWebImageContextCacheKeyFilter];
+    NSString *cacheKey;
+    if (cacheKeyFilter) {
+        cacheKey = [cacheKeyFilter cacheKeyForURL:imageURL];
+    } else {
+        cacheKey = imageURL.absoluteString;
+    }
+    SDImageCoderOptions *coderOptions = SDGetDecodeOptionsFromContext(context, options, cacheKey);
+    BOOL decodeFirstFrame = SD_OPTIONS_CONTAINS(options, SDWebImageDecodeFirstFrameOnly);
+    CGFloat scale = [coderOptions[SDImageCoderDecodeScaleFactor] doubleValue];
+    
+    // Grab the image coder
+    id<SDImageCoder> imageCoder = context[SDWebImageContextImageCoder];
+    if (!imageCoder) {
+        imageCoder = [SDImageCodersManager sharedManager];
+    }
+    
+    if (!decodeFirstFrame) {
+        // check whether we should use `SDAnimatedImage`
+        Class animatedImageClass = context[SDWebImageContextAnimatedImageClass];
+        if ([animatedImageClass isSubclassOfClass:[UIImage class]] && [animatedImageClass conformsToProtocol:@protocol(SDAnimatedImage)]) {
+            image = [[animatedImageClass alloc] initWithData:imageData scale:scale options:coderOptions];
+            if (image) {
+                // Preload frames if supported
+                if (options & SDWebImagePreloadAllFrames && [image respondsToSelector:@selector(preloadAllFrames)]) {
+                    [((id<SDAnimatedImage>)image) preloadAllFrames];
+                }
+            } else {
+                // Check image class matching
+                if (options & SDWebImageMatchAnimatedImageClass) {
+                    return nil;
+                }
+            }
+        }
+    }
+    if (!image) {
+        image = [imageCoder decodedImageWithData:imageData options:coderOptions];
+    }
+    if (image) {
+        SDImageForceDecodePolicy policy = SDImageForceDecodePolicyAutomatic;
+        NSNumber *policyValue = context[SDWebImageContextImageForceDecodePolicy];
+        if (policyValue != nil) {
+            policy = policyValue.unsignedIntegerValue;
+        }
+        // TODO: Deprecated, remove in SD 6.0...
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+        if (SD_OPTIONS_CONTAINS(options, SDWebImageAvoidDecodeImage)) {
+            policy = SDImageForceDecodePolicyNever;
+        }
+#pragma clang diagnostic pop
+        image = [SDImageCoderHelper decodedImageWithImage:image policy:policy];
+        // assign the decode options, to let manager check whether to re-decode if needed
+        image.sd_decodeOptions = coderOptions;
+    }
+    
+    return image;
+}
+
+UIImage * _Nullable SDImageLoaderDecodeProgressiveImageData(NSData * _Nonnull imageData, NSURL * _Nonnull imageURL, BOOL finished,  id<SDWebImageOperation> _Nonnull operation, SDWebImageOptions options, SDWebImageContext * _Nullable context) {
+    NSCParameterAssert(imageData);
+    NSCParameterAssert(imageURL);
+    NSCParameterAssert(operation);
+    
+    UIImage *image;
+    id<SDWebImageCacheKeyFilter> cacheKeyFilter = context[SDWebImageContextCacheKeyFilter];
+    NSString *cacheKey;
+    if (cacheKeyFilter) {
+        cacheKey = [cacheKeyFilter cacheKeyForURL:imageURL];
+    } else {
+        cacheKey = imageURL.absoluteString;
+    }
+    SDImageCoderOptions *coderOptions = SDGetDecodeOptionsFromContext(context, options, cacheKey);
+    BOOL decodeFirstFrame = SD_OPTIONS_CONTAINS(options, SDWebImageDecodeFirstFrameOnly);
+    CGFloat scale = [coderOptions[SDImageCoderDecodeScaleFactor] doubleValue];
+    
+    // Grab the progressive image coder
+    id<SDProgressiveImageCoder> progressiveCoder = SDImageLoaderGetProgressiveCoder(operation);
+    if (!progressiveCoder) {
+        id<SDProgressiveImageCoder> imageCoder = context[SDWebImageContextImageCoder];
+        // Check the progressive coder if provided
+        if ([imageCoder respondsToSelector:@selector(initIncrementalWithOptions:)]) {
+            progressiveCoder = [[[imageCoder class] alloc] initIncrementalWithOptions:coderOptions];
+        } else {
+            // We need to create a new instance for progressive decoding to avoid conflicts
+            for (id<SDImageCoder> coder in [SDImageCodersManager sharedManager].coders.reverseObjectEnumerator) {
+                if ([coder conformsToProtocol:@protocol(SDProgressiveImageCoder)] &&
+                    [((id<SDProgressiveImageCoder>)coder) canIncrementalDecodeFromData:imageData]) {
+                    progressiveCoder = [[[coder class] alloc] initIncrementalWithOptions:coderOptions];
+                    break;
+                }
+            }
+        }
+        SDImageLoaderSetProgressiveCoder(operation, progressiveCoder);
+    }
+    // If we can't find any progressive coder, disable progressive download
+    if (!progressiveCoder) {
+        return nil;
+    }
+    
+    [progressiveCoder updateIncrementalData:imageData finished:finished];
+    if (!decodeFirstFrame) {
+        // check whether we should use `SDAnimatedImage`
+        Class animatedImageClass = context[SDWebImageContextAnimatedImageClass];
+        if ([animatedImageClass isSubclassOfClass:[UIImage class]] && [animatedImageClass conformsToProtocol:@protocol(SDAnimatedImage)] && [progressiveCoder respondsToSelector:@selector(animatedImageFrameAtIndex:)]) {
+            image = [[animatedImageClass alloc] initWithAnimatedCoder:(id<SDAnimatedImageCoder>)progressiveCoder scale:scale];
+            if (image) {
+                // Progressive decoding does not preload frames
+            } else {
+                // Check image class matching
+                if (options & SDWebImageMatchAnimatedImageClass) {
+                    return nil;
+                }
+            }
+        }
+    }
+    if (!image) {
+        image = [progressiveCoder incrementalDecodedImageWithOptions:coderOptions];
+    }
+    if (image) {
+        SDImageForceDecodePolicy policy = SDImageForceDecodePolicyAutomatic;
+        NSNumber *policyValue = context[SDWebImageContextImageForceDecodePolicy];
+        if (policyValue != nil) {
+            policy = policyValue.unsignedIntegerValue;
+        }
+        // TODO: Deprecated, remove in SD 6.0...
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+        if (SD_OPTIONS_CONTAINS(options, SDWebImageAvoidDecodeImage)) {
+            policy = SDImageForceDecodePolicyNever;
+        }
+#pragma clang diagnostic pop
+        image = [SDImageCoderHelper decodedImageWithImage:image policy:policy];
+        // assign the decode options, to let manager check whether to re-decode if needed
+        image.sd_decodeOptions = coderOptions;
+        // mark the image as progressive (completed one are not mark as progressive)
+        image.sd_isIncremental = !finished;
+    }
+    
+    return image;
+}
diff --git a/SDWebImage/Core/SDImageLoadersManager.h b/SDWebImage/Core/SDImageLoadersManager.h
new file mode 100644
index 000000000..9886f459f
--- /dev/null
+++ b/SDWebImage/Core/SDImageLoadersManager.h
@@ -0,0 +1,40 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDImageLoader.h"
+
+/**
+ A loaders manager to manage multiple loaders
+ */
+@interface SDImageLoadersManager : NSObject <SDImageLoader>
+
+/**
+ Returns the global shared loaders manager instance. By default we will set [`SDWebImageDownloader.sharedDownloader`] into the loaders array.
+ */
+@property (nonatomic, class, readonly, nonnull) SDImageLoadersManager *sharedManager;
+
+/**
+ All image loaders in manager. The loaders array is a priority queue, which means the later added loader will have the highest priority
+ */
+@property (nonatomic, copy, nullable) NSArray<id<SDImageLoader>>* loaders;
+
+/**
+ Add a new image loader to the end of loaders array. Which has the highest priority.
+ 
+ @param loader loader
+ */
+- (void)addLoader:(nonnull id<SDImageLoader>)loader;
+
+/**
+ Remove an image loader in the loaders array.
+ 
+ @param loader loader
+ */
+- (void)removeLoader:(nonnull id<SDImageLoader>)loader;
+
+@end
diff --git a/SDWebImage/Core/SDImageLoadersManager.m b/SDWebImage/Core/SDImageLoadersManager.m
new file mode 100644
index 000000000..ac86c29da
--- /dev/null
+++ b/SDWebImage/Core/SDImageLoadersManager.m
@@ -0,0 +1,123 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDImageLoadersManager.h"
+#import "SDWebImageDownloader.h"
+#import "SDInternalMacros.h"
+
+@interface SDImageLoadersManager ()
+
+@property (nonatomic, strong, nonnull) NSMutableArray<id<SDImageLoader>> *imageLoaders;
+
+@end
+
+@implementation SDImageLoadersManager {
+    SD_LOCK_DECLARE(_loadersLock);
+}
+
++ (SDImageLoadersManager *)sharedManager {
+    static dispatch_once_t onceToken;
+    static SDImageLoadersManager *manager;
+    dispatch_once(&onceToken, ^{
+        manager = [[SDImageLoadersManager alloc] init];
+    });
+    return manager;
+}
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        // initialize with default image loaders
+        _imageLoaders = [NSMutableArray arrayWithObject:[SDWebImageDownloader sharedDownloader]];
+        SD_LOCK_INIT(_loadersLock);
+    }
+    return self;
+}
+
+- (NSArray<id<SDImageLoader>> *)loaders {
+    SD_LOCK(_loadersLock);
+    NSArray<id<SDImageLoader>>* loaders = [_imageLoaders copy];
+    SD_UNLOCK(_loadersLock);
+    return loaders;
+}
+
+- (void)setLoaders:(NSArray<id<SDImageLoader>> *)loaders {
+    SD_LOCK(_loadersLock);
+    [_imageLoaders removeAllObjects];
+    if (loaders.count) {
+        [_imageLoaders addObjectsFromArray:loaders];
+    }
+    SD_UNLOCK(_loadersLock);
+}
+
+#pragma mark - Loader Property
+
+- (void)addLoader:(id<SDImageLoader>)loader {
+    if (![loader conformsToProtocol:@protocol(SDImageLoader)]) {
+        return;
+    }
+    SD_LOCK(_loadersLock);
+    [_imageLoaders addObject:loader];
+    SD_UNLOCK(_loadersLock);
+}
+
+- (void)removeLoader:(id<SDImageLoader>)loader {
+    if (![loader conformsToProtocol:@protocol(SDImageLoader)]) {
+        return;
+    }
+    SD_LOCK(_loadersLock);
+    [_imageLoaders removeObject:loader];
+    SD_UNLOCK(_loadersLock);
+}
+
+#pragma mark - SDImageLoader
+
+- (BOOL)canRequestImageForURL:(nullable NSURL *)url {
+    return [self canRequestImageForURL:url options:0 context:nil];
+}
+
+- (BOOL)canRequestImageForURL:(NSURL *)url options:(SDWebImageOptions)options context:(SDWebImageContext *)context {
+    NSArray<id<SDImageLoader>> *loaders = self.loaders;
+    for (id<SDImageLoader> loader in loaders.reverseObjectEnumerator) {
+        if ([loader respondsToSelector:@selector(canRequestImageForURL:options:context:)]) {
+            if ([loader canRequestImageForURL:url options:options context:context]) {
+                return YES;
+            }
+        } else {
+            if ([loader canRequestImageForURL:url]) {
+                return YES;
+            }
+        }
+    }
+    return NO;
+}
+
+- (id<SDWebImageOperation>)requestImageWithURL:(NSURL *)url options:(SDWebImageOptions)options context:(SDWebImageContext *)context progress:(SDImageLoaderProgressBlock)progressBlock completed:(SDImageLoaderCompletedBlock)completedBlock {
+    if (!url) {
+        return nil;
+    }
+    NSArray<id<SDImageLoader>> *loaders = self.loaders;
+    for (id<SDImageLoader> loader in loaders.reverseObjectEnumerator) {
+        if ([loader canRequestImageForURL:url]) {
+            return [loader requestImageWithURL:url options:options context:context progress:progressBlock completed:completedBlock];
+        }
+    }
+    return nil;
+}
+
+- (BOOL)shouldBlockFailedURLWithURL:(NSURL *)url error:(NSError *)error {
+    NSArray<id<SDImageLoader>> *loaders = self.loaders;
+    for (id<SDImageLoader> loader in loaders.reverseObjectEnumerator) {
+        if ([loader canRequestImageForURL:url]) {
+            return [loader shouldBlockFailedURLWithURL:url error:error];
+        }
+    }
+    return NO;
+}
+
+@end
diff --git a/SDWebImage/Core/SDImageTransformer.h b/SDWebImage/Core/SDImageTransformer.h
new file mode 100644
index 000000000..640065cd7
--- /dev/null
+++ b/SDWebImage/Core/SDImageTransformer.h
@@ -0,0 +1,283 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+#import "UIImage+Transform.h"
+
+/**
+ Return the transformed cache key which applied with specify transformerKey.
+
+ @param key The original cache key
+ @param transformerKey The transformer key from the transformer
+ @return The transformed cache key
+ */
+FOUNDATION_EXPORT NSString * _Nullable SDTransformedKeyForKey(NSString * _Nullable key, NSString * _Nonnull transformerKey);
+
+/**
+ Return the thumbnailed cache key which applied with specify thumbnailSize and preserveAspectRatio control.
+ @param key The original cache key
+ @param thumbnailPixelSize The thumbnail pixel size
+ @param preserveAspectRatio The preserve aspect ratio option
+ @return The thumbnailed cache key
+ @note If you have both transformer and thumbnail applied for image, call `SDThumbnailedKeyForKey` firstly and then with `SDTransformedKeyForKey`.`
+ */
+FOUNDATION_EXPORT NSString * _Nullable SDThumbnailedKeyForKey(NSString * _Nullable key, CGSize thumbnailPixelSize, BOOL preserveAspectRatio);
+
+/**
+ A transformer protocol to transform the image load from cache or from download.
+ You can provide transformer to cache and manager (Through the `transformer` property or context option `SDWebImageContextImageTransformer`).
+ From v5.20, the transformer class also can be used on animated image frame post-transform logic, see `SDAnimatedImageView`.
+ 
+ @note The transform process is called from a global queue in order to not to block the main queue.
+ */
+@protocol SDImageTransformer <NSObject>
+
+@optional
+
+/**
+ Defaults to YES if you don't implements this method.
+ We keep some metadata like Image Format (`sd_imageFormat`)/ Animated Loop Count (`sd_imageLoopCount`) via associated object on UIImage instance.
+ When transformer generate a new UIImage instance, in most cases you still want to keep these information. So this is what for during the image loading pipeline.
+ If the value is YES, we will keep and override the metadata **After you generate the UIImage**
+ If the value is NO, we will not touch the UIImage metadata and it's controlled by you during the generation. Read `UIImage+Medata.h` and pick the metadata you want for the new generated UIImage.
+ */
+@property (nonatomic, assign, readonly) BOOL preserveImageMetadata;
+
+@required
+/**
+ For each transformer, it must contains its cache key to used to store the image cache or query from the cache. This key will be appened after the original cache key generated by URL or from user.
+ Which means, the cache should match what your transformer logic do. The same `input image` + `transformer key`, should always generate the same `output image`.
+
+ @return The cache key to appended after the original cache key. Should not be nil.
+ */
+@property (nonatomic, copy, readonly, nonnull) NSString *transformerKey;
+
+/**
+ Transform the image to another image.
+
+ @param image The image to be transformed
+ @param key The cache key associated to the image. This arg is a hint for image source, not always useful and should be nullable. In the future we will remove this arg.
+ @return The transformed image, or nil if transform failed
+ */
+- (nullable UIImage *)transformedImageWithImage:(nonnull UIImage *)image forKey:(nonnull NSString *)key API_DEPRECATED("The key arg will be removed in the future. Update your code and don't rely on that.", macos(10.10, API_TO_BE_DEPRECATED), ios(8.0, API_TO_BE_DEPRECATED), tvos(9.0, API_TO_BE_DEPRECATED), watchos(2.0, API_TO_BE_DEPRECATED));
+
+@end
+
+#pragma mark - Pipeline
+
+/**
+ Pipeline transformer. Which you can bind multiple transformers together to let the image to be transformed one by one in order and generate the final image.
+ @note Because transformers are lightweight, if you want to append or arrange transformers, create another pipeline transformer instead. This class is considered as immutable.
+ */
+@interface SDImagePipelineTransformer : NSObject<SDImageTransformer>
+/// For pipeline transformer, this property is readonly and always return NO. We handle each transformer's choice inside implementation
+@property (nonatomic, assign, readonly) BOOL preserveImageMetadata;
+/**
+ All transformers in pipeline
+ */
+@property (nonatomic, copy, readonly, nonnull) NSArray<id<SDImageTransformer>> *transformers;
+
+- (nonnull instancetype)init NS_UNAVAILABLE;
++ (nonnull instancetype)new  NS_UNAVAILABLE;
+
++ (nonnull instancetype)transformerWithTransformers:(nonnull NSArray<id<SDImageTransformer>> *)transformers;
+
+@end
+
+#pragma mark - Base
+/// This is the base class for our built-in concrete transformers. You should not use this class directlly, use cconcrete subclass (like `SDImageRoundCornerTransformer`) instead.
+@interface SDImageBaseTransformer : NSObject<SDImageTransformer>
+/// For concrete transformer, this property is readwrite and defaults to YES. You can choose whether to preserve image metadata **After you generate the UIImage**
+@property (nonatomic, assign, readwrite) BOOL preserveImageMetadata;
+@end
+
+// There are some built-in transformers based on the `UIImage+Transformer` category to provide the common image geometry, image blending and image effect process. Those transform are useful for static image only but you can create your own to support animated image as well.
+// Because transformers are lightweight, these class are considered as immutable.
+#pragma mark - Image Geometry
+
+/**
+ Image round corner transformer
+ */
+@interface SDImageRoundCornerTransformer: SDImageBaseTransformer
+
+/**
+ The radius of each corner oval. Values larger than half the
+ rectangle's width or height are clamped appropriately to
+ half the width or height.
+ */
+@property (nonatomic, assign, readonly) CGFloat cornerRadius;
+
+/**
+ A bitmask value that identifies the corners that you want
+ rounded. You can use this parameter to round only a subset
+ of the corners of the rectangle.
+ */
+@property (nonatomic, assign, readonly) SDRectCorner corners;
+
+/**
+ The inset border line width. Values larger than half the rectangle's
+ width or height are clamped appropriately to half the width
+ or height.
+ */
+@property (nonatomic, assign, readonly) CGFloat borderWidth;
+
+/**
+ The border stroke color. nil means clear color.
+ */
+@property (nonatomic, strong, readonly, nullable) UIColor *borderColor;
+
+- (nonnull instancetype)init NS_UNAVAILABLE;
++ (nonnull instancetype)new  NS_UNAVAILABLE;
+
++ (nonnull instancetype)transformerWithRadius:(CGFloat)cornerRadius corners:(SDRectCorner)corners borderWidth:(CGFloat)borderWidth borderColor:(nullable UIColor *)borderColor;
+
+@end
+
+/**
+ Image resizing transformer
+ */
+@interface SDImageResizingTransformer : SDImageBaseTransformer
+
+/**
+ The new size to be resized, values should be positive.
+ */
+@property (nonatomic, assign, readonly) CGSize size;
+
+/**
+ The scale mode for image content.
+ */
+@property (nonatomic, assign, readonly) SDImageScaleMode scaleMode;
+
+- (nonnull instancetype)init NS_UNAVAILABLE;
++ (nonnull instancetype)new  NS_UNAVAILABLE;
+
++ (nonnull instancetype)transformerWithSize:(CGSize)size scaleMode:(SDImageScaleMode)scaleMode;
+
+@end
+
+/**
+ Image cropping transformer
+ */
+@interface SDImageCroppingTransformer : SDImageBaseTransformer
+
+/**
+ Image's inner rect.
+ */
+@property (nonatomic, assign, readonly) CGRect rect;
+
+- (nonnull instancetype)init NS_UNAVAILABLE;
++ (nonnull instancetype)new  NS_UNAVAILABLE;
+
++ (nonnull instancetype)transformerWithRect:(CGRect)rect;
+
+@end
+
+/**
+ Image flipping transformer
+ */
+@interface SDImageFlippingTransformer : SDImageBaseTransformer
+
+/**
+ YES to flip the image horizontally. ⇋
+ */
+@property (nonatomic, assign, readonly) BOOL horizontal;
+
+/**
+ YES to flip the image vertically. ⥯
+ */
+@property (nonatomic, assign, readonly) BOOL vertical;
+
+- (nonnull instancetype)init NS_UNAVAILABLE;
++ (nonnull instancetype)new  NS_UNAVAILABLE;
+
++ (nonnull instancetype)transformerWithHorizontal:(BOOL)horizontal vertical:(BOOL)vertical;
+
+@end
+
+/**
+ Image rotation transformer
+ */
+@interface SDImageRotationTransformer : SDImageBaseTransformer
+
+/**
+ Rotated radians in counterclockwise.⟲
+ */
+@property (nonatomic, assign, readonly) CGFloat angle;
+
+/**
+ YES: new image's size is extend to fit all content.
+ NO: image's size will not change, content may be clipped.
+ */
+@property (nonatomic, assign, readonly) BOOL fitSize;
+
+- (nonnull instancetype)init NS_UNAVAILABLE;
++ (nonnull instancetype)new  NS_UNAVAILABLE;
+
++ (nonnull instancetype)transformerWithAngle:(CGFloat)angle fitSize:(BOOL)fitSize;
+
+@end
+
+#pragma mark - Image Blending
+
+/**
+ Image tint color transformer
+ */
+@interface SDImageTintTransformer : SDImageBaseTransformer
+
+/**
+ The tint color.
+ */
+@property (nonatomic, strong, readonly, nonnull) UIColor *tintColor;
+/// The blend mode, defaults to `sourceIn` if you use the initializer without blend mode
+@property (nonatomic, assign, readonly) CGBlendMode blendMode;
+
+- (nonnull instancetype)init NS_UNAVAILABLE;
++ (nonnull instancetype)new  NS_UNAVAILABLE;
+
++ (nonnull instancetype)transformerWithColor:(nonnull UIColor *)tintColor;
++ (nonnull instancetype)transformerWithColor:(nonnull UIColor *)tintColor blendMode:(CGBlendMode)blendMode;
+
+@end
+
+#pragma mark - Image Effect
+
+/**
+ Image blur effect transformer
+ */
+@interface SDImageBlurTransformer : SDImageBaseTransformer
+
+/**
+ The radius of the blur in points, 0 means no blur effect.
+ */
+@property (nonatomic, assign, readonly) CGFloat blurRadius;
+
+- (nonnull instancetype)init NS_UNAVAILABLE;
++ (nonnull instancetype)new  NS_UNAVAILABLE;
+
++ (nonnull instancetype)transformerWithRadius:(CGFloat)blurRadius;
+
+@end
+
+#if SD_UIKIT || SD_MAC
+/**
+ Core Image filter transformer
+ */
+@interface SDImageFilterTransformer: SDImageBaseTransformer
+
+/**
+ The CIFilter to be applied to the image.
+ */
+@property (nonatomic, strong, readonly, nonnull) CIFilter *filter;
+
+- (nonnull instancetype)init NS_UNAVAILABLE;
++ (nonnull instancetype)new  NS_UNAVAILABLE;
+
++ (nonnull instancetype)transformerWithFilter:(nonnull CIFilter *)filter;
+
+@end
+#endif
diff --git a/SDWebImage/Core/SDImageTransformer.m b/SDWebImage/Core/SDImageTransformer.m
new file mode 100644
index 000000000..15fcd26b5
--- /dev/null
+++ b/SDWebImage/Core/SDImageTransformer.m
@@ -0,0 +1,375 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDImageTransformer.h"
+#import "UIColor+SDHexString.h"
+#import "SDAssociatedObject.h"
+#if SD_UIKIT || SD_MAC
+#import <CoreImage/CoreImage.h>
+#endif
+
+// Separator for different transformerKey, for example, `image.png` |> flip(YES,NO) |> rotate(pi/4,YES) => 'image-SDImageFlippingTransformer(1,0)-SDImageRotationTransformer(0.78539816339,1).png'
+static NSString * const SDImageTransformerKeySeparator = @"-";
+
+NSString * _Nullable SDTransformedKeyForKey(NSString * _Nullable key, NSString * _Nonnull transformerKey) {
+    if (!key || !transformerKey) {
+        return nil;
+    }
+    // Find the file extension
+    NSURL *keyURL = [NSURL URLWithString:key];
+    NSString *ext = keyURL ? keyURL.pathExtension : key.pathExtension;
+    if (ext.length > 0) {
+        // For non-file URL
+        if (keyURL && !keyURL.isFileURL) {
+            // keep anything except path (like URL query)
+            NSURLComponents *component = [NSURLComponents componentsWithURL:keyURL resolvingAgainstBaseURL:NO];
+            component.path = [[[component.path.stringByDeletingPathExtension stringByAppendingString:SDImageTransformerKeySeparator] stringByAppendingString:transformerKey] stringByAppendingPathExtension:ext];
+            return component.URL.absoluteString;
+        } else {
+            // file URL
+            return [[[key.stringByDeletingPathExtension stringByAppendingString:SDImageTransformerKeySeparator] stringByAppendingString:transformerKey] stringByAppendingPathExtension:ext];
+        }
+    } else {
+        return [[key stringByAppendingString:SDImageTransformerKeySeparator] stringByAppendingString:transformerKey];
+    }
+}
+
+NSString * _Nullable SDThumbnailedKeyForKey(NSString * _Nullable key, CGSize thumbnailPixelSize, BOOL preserveAspectRatio) {
+    NSString *thumbnailKey = [NSString stringWithFormat:@"Thumbnail({%f,%f},%d)", thumbnailPixelSize.width, thumbnailPixelSize.height, preserveAspectRatio];
+    return SDTransformedKeyForKey(key, thumbnailKey);
+}
+
+@interface SDImagePipelineTransformer ()
+
+@property (nonatomic, copy, readwrite, nonnull) NSArray<id<SDImageTransformer>> *transformers;
+@property (nonatomic, copy, readwrite) NSString *transformerKey;
+
+@end
+
+@implementation SDImagePipelineTransformer
+
++ (instancetype)transformerWithTransformers:(NSArray<id<SDImageTransformer>> *)transformers {
+    SDImagePipelineTransformer *transformer = [SDImagePipelineTransformer new];
+    transformer.transformers = transformers;
+    transformer.transformerKey = [[self class] cacheKeyForTransformers:transformers];
+    
+    return transformer;
+}
+
++ (NSString *)cacheKeyForTransformers:(NSArray<id<SDImageTransformer>> *)transformers {
+    if (transformers.count == 0) {
+        return @"";
+    }
+    NSMutableArray<NSString *> *cacheKeys = [NSMutableArray arrayWithCapacity:transformers.count];
+    [transformers enumerateObjectsUsingBlock:^(id<SDImageTransformer>  _Nonnull transformer, NSUInteger idx, BOOL * _Nonnull stop) {
+        NSString *cacheKey = transformer.transformerKey;
+        [cacheKeys addObject:cacheKey];
+    }];
+    
+    return [cacheKeys componentsJoinedByString:SDImageTransformerKeySeparator];
+}
+
+- (BOOL)preserveImageMetadata {
+    return NO; // We handle this logic inside `transformedImageWithImage` below
+}
+
+- (UIImage *)transformedImageWithImage:(UIImage *)image forKey:(NSString *)key {
+    if (!image) {
+        return nil;
+    }
+    UIImage *transformedImage = image;
+    for (id<SDImageTransformer> transformer in self.transformers) {
+        UIImage *newImage = [transformer transformedImageWithImage:transformedImage forKey:key];
+        // Handle each transformer's preserveImageMetadata choice
+        BOOL preserveImageMetadata = YES;
+        if ([transformer respondsToSelector:@selector(preserveImageMetadata)]) {
+            preserveImageMetadata = transformer.preserveImageMetadata;
+        }
+        if (preserveImageMetadata) {
+            SDImageCopyAssociatedObject(transformedImage, newImage);
+        }
+        transformedImage = newImage;
+    }
+    return transformedImage;
+}
+
+@end
+
+@implementation SDImageBaseTransformer
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        _preserveImageMetadata = YES;
+    }
+    return self;
+}
+
+- (NSString *)transformerKey {
+    @throw [NSException exceptionWithName:NSInternalInconsistencyException
+                                   reason:[NSString stringWithFormat:@"For `SDImageBaseTransformer` subclass, you must override %@ method", NSStringFromSelector(_cmd)]
+                                 userInfo:nil];
+}
+
+- (nullable UIImage *)transformedImageWithImage:(nonnull UIImage *)image forKey:(nonnull NSString *)key {
+    @throw [NSException exceptionWithName:NSInternalInconsistencyException
+                                   reason:[NSString stringWithFormat:@"For `SDImageBaseTransformer` subclass, you must override %@ method", NSStringFromSelector(_cmd)]
+                                 userInfo:nil];
+}
+
+@end
+
+@interface SDImageRoundCornerTransformer ()
+
+@property (nonatomic, assign) CGFloat cornerRadius;
+@property (nonatomic, assign) SDRectCorner corners;
+@property (nonatomic, assign) CGFloat borderWidth;
+@property (nonatomic, strong, nullable) UIColor *borderColor;
+
+@end
+
+@implementation SDImageRoundCornerTransformer
+
++ (instancetype)transformerWithRadius:(CGFloat)cornerRadius corners:(SDRectCorner)corners borderWidth:(CGFloat)borderWidth borderColor:(UIColor *)borderColor {
+    SDImageRoundCornerTransformer *transformer = [SDImageRoundCornerTransformer new];
+    transformer.cornerRadius = cornerRadius;
+    transformer.corners = corners;
+    transformer.borderWidth = borderWidth;
+    transformer.borderColor = borderColor;
+    
+    return transformer;
+}
+
+- (NSString *)transformerKey {
+    return [NSString stringWithFormat:@"SDImageRoundCornerTransformer(%f,%lu,%f,%@)", self.cornerRadius, (unsigned long)self.corners, self.borderWidth, self.borderColor.sd_hexString];
+}
+
+- (UIImage *)transformedImageWithImage:(UIImage *)image forKey:(NSString *)key {
+    if (!image) {
+        return nil;
+    }
+    return [image sd_roundedCornerImageWithRadius:self.cornerRadius corners:self.corners borderWidth:self.borderWidth borderColor:self.borderColor];
+}
+
+@end
+
+@interface SDImageResizingTransformer ()
+
+@property (nonatomic, assign) CGSize size;
+@property (nonatomic, assign) SDImageScaleMode scaleMode;
+
+@end
+
+@implementation SDImageResizingTransformer
+
++ (instancetype)transformerWithSize:(CGSize)size scaleMode:(SDImageScaleMode)scaleMode {
+    SDImageResizingTransformer *transformer = [SDImageResizingTransformer new];
+    transformer.size = size;
+    transformer.scaleMode = scaleMode;
+    
+    return transformer;
+}
+
+- (NSString *)transformerKey {
+    CGSize size = self.size;
+    return [NSString stringWithFormat:@"SDImageResizingTransformer({%f,%f},%lu)", size.width, size.height, (unsigned long)self.scaleMode];
+}
+
+- (UIImage *)transformedImageWithImage:(UIImage *)image forKey:(NSString *)key {
+    if (!image) {
+        return nil;
+    }
+    return [image sd_resizedImageWithSize:self.size scaleMode:self.scaleMode];
+}
+
+@end
+
+@interface SDImageCroppingTransformer ()
+
+@property (nonatomic, assign) CGRect rect;
+
+@end
+
+@implementation SDImageCroppingTransformer
+
++ (instancetype)transformerWithRect:(CGRect)rect {
+    SDImageCroppingTransformer *transformer = [SDImageCroppingTransformer new];
+    transformer.rect = rect;
+    
+    return transformer;
+}
+
+- (NSString *)transformerKey {
+    CGRect rect = self.rect;
+    return [NSString stringWithFormat:@"SDImageCroppingTransformer({%f,%f,%f,%f})", rect.origin.x, rect.origin.y, rect.size.width, rect.size.height];
+}
+
+- (UIImage *)transformedImageWithImage:(UIImage *)image forKey:(NSString *)key {
+    if (!image) {
+        return nil;
+    }
+    return [image sd_croppedImageWithRect:self.rect];
+}
+
+@end
+
+@interface SDImageFlippingTransformer ()
+
+@property (nonatomic, assign) BOOL horizontal;
+@property (nonatomic, assign) BOOL vertical;
+
+@end
+
+@implementation SDImageFlippingTransformer
+
++ (instancetype)transformerWithHorizontal:(BOOL)horizontal vertical:(BOOL)vertical {
+    SDImageFlippingTransformer *transformer = [SDImageFlippingTransformer new];
+    transformer.horizontal = horizontal;
+    transformer.vertical = vertical;
+    
+    return transformer;
+}
+
+- (NSString *)transformerKey {
+    return [NSString stringWithFormat:@"SDImageFlippingTransformer(%d,%d)", self.horizontal, self.vertical];
+}
+
+- (UIImage *)transformedImageWithImage:(UIImage *)image forKey:(NSString *)key {
+    if (!image) {
+        return nil;
+    }
+    return [image sd_flippedImageWithHorizontal:self.horizontal vertical:self.vertical];
+}
+
+@end
+
+@interface SDImageRotationTransformer ()
+
+@property (nonatomic, assign) CGFloat angle;
+@property (nonatomic, assign) BOOL fitSize;
+
+@end
+
+@implementation SDImageRotationTransformer
+
++ (instancetype)transformerWithAngle:(CGFloat)angle fitSize:(BOOL)fitSize {
+    SDImageRotationTransformer *transformer = [SDImageRotationTransformer new];
+    transformer.angle = angle;
+    transformer.fitSize = fitSize;
+    
+    return transformer;
+}
+
+- (NSString *)transformerKey {
+    return [NSString stringWithFormat:@"SDImageRotationTransformer(%f,%d)", self.angle, self.fitSize];
+}
+
+- (UIImage *)transformedImageWithImage:(UIImage *)image forKey:(NSString *)key {
+    if (!image) {
+        return nil;
+    }
+    return [image sd_rotatedImageWithAngle:self.angle fitSize:self.fitSize];
+}
+
+@end
+
+#pragma mark - Image Blending
+
+@interface SDImageTintTransformer ()
+
+@property (nonatomic, strong, nonnull) UIColor *tintColor;
+@property (nonatomic, assign) CGBlendMode blendMode;
+
+@end
+
+@implementation SDImageTintTransformer
+
++ (instancetype)transformerWithColor:(UIColor *)tintColor {
+    return [self transformerWithColor:tintColor blendMode:kCGBlendModeSourceIn];
+}
+
++ (instancetype)transformerWithColor:(UIColor *)tintColor blendMode:(CGBlendMode)blendMode {
+    SDImageTintTransformer *transformer = [SDImageTintTransformer new];
+    transformer.tintColor = tintColor;
+    transformer.blendMode = blendMode;
+    
+    return transformer;
+}
+
+- (NSString *)transformerKey {
+    return [NSString stringWithFormat:@"SDImageTintTransformer(%@,%d)", self.tintColor.sd_hexString, self.blendMode];
+}
+
+- (UIImage *)transformedImageWithImage:(UIImage *)image forKey:(NSString *)key {
+    if (!image) {
+        return nil;
+    }
+    return [image sd_tintedImageWithColor:self.tintColor blendMode:self.blendMode];
+}
+
+@end
+
+#pragma mark - Image Effect
+
+@interface SDImageBlurTransformer ()
+
+@property (nonatomic, assign) CGFloat blurRadius;
+
+@end
+
+@implementation SDImageBlurTransformer
+
++ (instancetype)transformerWithRadius:(CGFloat)blurRadius {
+    SDImageBlurTransformer *transformer = [SDImageBlurTransformer new];
+    transformer.blurRadius = blurRadius;
+    
+    return transformer;
+}
+
+- (NSString *)transformerKey {
+    return [NSString stringWithFormat:@"SDImageBlurTransformer(%f)", self.blurRadius];
+}
+
+- (UIImage *)transformedImageWithImage:(UIImage *)image forKey:(NSString *)key {
+    if (!image) {
+        return nil;
+    }
+    return [image sd_blurredImageWithRadius:self.blurRadius];
+}
+
+@end
+
+#if SD_UIKIT || SD_MAC
+@interface SDImageFilterTransformer ()
+
+@property (nonatomic, strong, nonnull) CIFilter *filter;
+
+@end
+
+@implementation SDImageFilterTransformer
+
++ (instancetype)transformerWithFilter:(CIFilter *)filter {
+    SDImageFilterTransformer *transformer = [SDImageFilterTransformer new];
+    transformer.filter = filter;
+    
+    return transformer;
+}
+
+- (NSString *)transformerKey {
+    return [NSString stringWithFormat:@"SDImageFilterTransformer(%@)", self.filter.name];
+}
+
+- (UIImage *)transformedImageWithImage:(UIImage *)image forKey:(NSString *)key {
+    if (!image) {
+        return nil;
+    }
+    return [image sd_filteredImageWithFilter:self.filter];
+}
+
+@end
+#endif
diff --git a/SDWebImage/Core/SDMemoryCache.h b/SDWebImage/Core/SDMemoryCache.h
new file mode 100644
index 000000000..43c39e843
--- /dev/null
+++ b/SDWebImage/Core/SDMemoryCache.h
@@ -0,0 +1,78 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+
+@class SDImageCacheConfig;
+/**
+ A protocol to allow custom memory cache used in SDImageCache.
+ */
+@protocol SDMemoryCache <NSObject>
+
+@required
+
+/**
+ Create a new memory cache instance with the specify cache config. You can check `maxMemoryCost` and `maxMemoryCount` used for memory cache.
+
+ @param config The cache config to be used to create the cache.
+ @return The new memory cache instance.
+ */
+- (nonnull instancetype)initWithConfig:(nonnull SDImageCacheConfig *)config;
+
+/**
+ Returns the value associated with a given key.
+
+ @param key An object identifying the value. If nil, just return nil.
+ @return The value associated with key, or nil if no value is associated with key.
+ */
+- (nullable id)objectForKey:(nonnull id)key;
+
+/**
+ Sets the value of the specified key in the cache (0 cost).
+
+ @param object The object to be stored in the cache. If nil, it calls `removeObjectForKey:`.
+ @param key    The key with which to associate the value. If nil, this method has no effect.
+ @discussion Unlike an NSMutableDictionary object, a cache does not copy the key
+ objects that are put into it.
+ */
+- (void)setObject:(nullable id)object forKey:(nonnull id)key;
+
+/**
+ Sets the value of the specified key in the cache, and associates the key-value
+ pair with the specified cost.
+
+ @param object The object to store in the cache. If nil, it calls `removeObjectForKey`.
+ @param key    The key with which to associate the value. If nil, this method has no effect.
+ @param cost   The cost with which to associate the key-value pair.
+ @discussion Unlike an NSMutableDictionary object, a cache does not copy the key
+ objects that are put into it.
+ */
+- (void)setObject:(nullable id)object forKey:(nonnull id)key cost:(NSUInteger)cost;
+
+/**
+ Removes the value of the specified key in the cache.
+
+ @param key The key identifying the value to be removed. If nil, this method has no effect.
+ */
+- (void)removeObjectForKey:(nonnull id)key;
+
+/**
+ Empties the cache immediately.
+ */
+- (void)removeAllObjects;
+
+@end
+
+/**
+ A memory cache which auto purge the cache on memory warning and support weak cache.
+ */
+@interface SDMemoryCache <KeyType, ObjectType> : NSCache <KeyType, ObjectType> <SDMemoryCache>
+
+@property (nonatomic, strong, nonnull, readonly) SDImageCacheConfig *config;
+
+@end
diff --git a/SDWebImage/Core/SDMemoryCache.m b/SDWebImage/Core/SDMemoryCache.m
new file mode 100644
index 000000000..7bcc38593
--- /dev/null
+++ b/SDWebImage/Core/SDMemoryCache.m
@@ -0,0 +1,158 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDMemoryCache.h"
+#import "SDImageCacheConfig.h"
+#import "UIImage+MemoryCacheCost.h"
+#import "SDInternalMacros.h"
+
+static void * SDMemoryCacheContext = &SDMemoryCacheContext;
+
+@interface SDMemoryCache <KeyType, ObjectType> () {
+#if SD_UIKIT
+    SD_LOCK_DECLARE(_weakCacheLock); // a lock to keep the access to `weakCache` thread-safe
+#endif
+}
+
+@property (nonatomic, strong, nullable) SDImageCacheConfig *config;
+#if SD_UIKIT
+@property (nonatomic, strong, nonnull) NSMapTable<KeyType, ObjectType> *weakCache; // strong-weak cache
+#endif
+@end
+
+@implementation SDMemoryCache
+
+- (void)dealloc {
+    [_config removeObserver:self forKeyPath:NSStringFromSelector(@selector(maxMemoryCost)) context:SDMemoryCacheContext];
+    [_config removeObserver:self forKeyPath:NSStringFromSelector(@selector(maxMemoryCount)) context:SDMemoryCacheContext];
+#if SD_UIKIT
+    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
+#endif
+    self.delegate = nil;
+}
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        _config = [[SDImageCacheConfig alloc] init];
+        [self commonInit];
+    }
+    return self;
+}
+
+- (instancetype)initWithConfig:(SDImageCacheConfig *)config {
+    self = [super init];
+    if (self) {
+        _config = config;
+        [self commonInit];
+    }
+    return self;
+}
+
+- (void)commonInit {
+    SDImageCacheConfig *config = self.config;
+    self.totalCostLimit = config.maxMemoryCost;
+    self.countLimit = config.maxMemoryCount;
+
+    [config addObserver:self forKeyPath:NSStringFromSelector(@selector(maxMemoryCost)) options:0 context:SDMemoryCacheContext];
+    [config addObserver:self forKeyPath:NSStringFromSelector(@selector(maxMemoryCount)) options:0 context:SDMemoryCacheContext];
+
+#if SD_UIKIT
+    self.weakCache = [[NSMapTable alloc] initWithKeyOptions:NSPointerFunctionsStrongMemory valueOptions:NSPointerFunctionsWeakMemory capacity:0];
+    SD_LOCK_INIT(_weakCacheLock);
+
+    [[NSNotificationCenter defaultCenter] addObserver:self
+                                             selector:@selector(didReceiveMemoryWarning:)
+                                                 name:UIApplicationDidReceiveMemoryWarningNotification
+                                               object:nil];
+#endif
+}
+
+// Current this seems no use on macOS (macOS use virtual memory and do not clear cache when memory warning). So we only override on iOS/tvOS platform.
+#if SD_UIKIT
+- (void)didReceiveMemoryWarning:(NSNotification *)notification {
+    // Only remove cache, but keep weak cache
+    [super removeAllObjects];
+}
+
+// `setObject:forKey:` just call this with 0 cost. Override this is enough
+- (void)setObject:(id)obj forKey:(id)key cost:(NSUInteger)g {
+    [super setObject:obj forKey:key cost:g];
+    if (!self.config.shouldUseWeakMemoryCache) {
+        return;
+    }
+    if (key && obj) {
+        // Store weak cache
+        SD_LOCK(_weakCacheLock);
+        [self.weakCache setObject:obj forKey:key];
+        SD_UNLOCK(_weakCacheLock);
+    }
+}
+
+- (id)objectForKey:(id)key {
+    id obj = [super objectForKey:key];
+    if (!self.config.shouldUseWeakMemoryCache) {
+        return obj;
+    }
+    if (key && !obj) {
+        // Check weak cache
+        SD_LOCK(_weakCacheLock);
+        obj = [self.weakCache objectForKey:key];
+        SD_UNLOCK(_weakCacheLock);
+        if (obj) {
+            // Sync cache
+            NSUInteger cost = 0;
+            if ([obj isKindOfClass:[UIImage class]]) {
+                cost = [(UIImage *)obj sd_memoryCost];
+            }
+            [super setObject:obj forKey:key cost:cost];
+        }
+    }
+    return obj;
+}
+
+- (void)removeObjectForKey:(id)key {
+    [super removeObjectForKey:key];
+    if (!self.config.shouldUseWeakMemoryCache) {
+        return;
+    }
+    if (key) {
+        // Remove weak cache
+        SD_LOCK(_weakCacheLock);
+        [self.weakCache removeObjectForKey:key];
+        SD_UNLOCK(_weakCacheLock);
+    }
+}
+
+- (void)removeAllObjects {
+    [super removeAllObjects];
+    if (!self.config.shouldUseWeakMemoryCache) {
+        return;
+    }
+    // Manually remove should also remove weak cache
+    SD_LOCK(_weakCacheLock);
+    [self.weakCache removeAllObjects];
+    SD_UNLOCK(_weakCacheLock);
+}
+#endif
+
+#pragma mark - KVO
+
+- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context {
+    if (context == SDMemoryCacheContext) {
+        if ([keyPath isEqualToString:NSStringFromSelector(@selector(maxMemoryCost))]) {
+            self.totalCostLimit = self.config.maxMemoryCost;
+        } else if ([keyPath isEqualToString:NSStringFromSelector(@selector(maxMemoryCount))]) {
+            self.countLimit = self.config.maxMemoryCount;
+        }
+    } else {
+        [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
+    }
+}
+
+@end
diff --git a/SDWebImage/Core/SDWebImageCacheKeyFilter.h b/SDWebImage/Core/SDWebImageCacheKeyFilter.h
new file mode 100644
index 000000000..7c569f341
--- /dev/null
+++ b/SDWebImage/Core/SDWebImageCacheKeyFilter.h
@@ -0,0 +1,35 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCompat.h"
+
+typedef NSString * _Nullable(^SDWebImageCacheKeyFilterBlock)(NSURL * _Nonnull url);
+
+/**
+ This is the protocol for cache key filter.
+ We can use a block to specify the cache key filter. But Using protocol can make this extensible, and allow Swift user to use it easily instead of using `@convention(block)` to store a block into context options.
+ */
+@protocol SDWebImageCacheKeyFilter <NSObject>
+
+- (nullable NSString *)cacheKeyForURL:(nonnull NSURL *)url;
+
+@end
+
+/**
+ A cache key filter class with block.
+ */
+@interface SDWebImageCacheKeyFilter : NSObject <SDWebImageCacheKeyFilter>
+
+- (nonnull instancetype)init NS_UNAVAILABLE;
++ (nonnull instancetype)new  NS_UNAVAILABLE;
+
+- (nonnull instancetype)initWithBlock:(nonnull SDWebImageCacheKeyFilterBlock)block;
++ (nonnull instancetype)cacheKeyFilterWithBlock:(nonnull SDWebImageCacheKeyFilterBlock)block;
+
+@end
diff --git a/SDWebImage/Core/SDWebImageCacheKeyFilter.m b/SDWebImage/Core/SDWebImageCacheKeyFilter.m
new file mode 100644
index 000000000..b4ebb8b46
--- /dev/null
+++ b/SDWebImage/Core/SDWebImageCacheKeyFilter.m
@@ -0,0 +1,39 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCacheKeyFilter.h"
+
+@interface SDWebImageCacheKeyFilter ()
+
+@property (nonatomic, copy, nonnull) SDWebImageCacheKeyFilterBlock block;
+
+@end
+
+@implementation SDWebImageCacheKeyFilter
+
+- (instancetype)initWithBlock:(SDWebImageCacheKeyFilterBlock)block {
+    self = [super init];
+    if (self) {
+        self.block = block;
+    }
+    return self;
+}
+
++ (instancetype)cacheKeyFilterWithBlock:(SDWebImageCacheKeyFilterBlock)block {
+    SDWebImageCacheKeyFilter *cacheKeyFilter = [[SDWebImageCacheKeyFilter alloc] initWithBlock:block];
+    return cacheKeyFilter;
+}
+
+- (NSString *)cacheKeyForURL:(NSURL *)url {
+    if (!self.block) {
+        return nil;
+    }
+    return self.block(url);
+}
+
+@end
diff --git a/SDWebImage/Core/SDWebImageCacheSerializer.h b/SDWebImage/Core/SDWebImageCacheSerializer.h
new file mode 100644
index 000000000..071931a72
--- /dev/null
+++ b/SDWebImage/Core/SDWebImageCacheSerializer.h
@@ -0,0 +1,39 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCompat.h"
+
+typedef NSData * _Nullable(^SDWebImageCacheSerializerBlock)(UIImage * _Nonnull image, NSData * _Nullable data, NSURL * _Nullable imageURL);
+
+/**
+ This is the protocol for cache serializer.
+ We can use a block to specify the cache serializer. But Using protocol can make this extensible, and allow Swift user to use it easily instead of using `@convention(block)` to store a block into context options.
+ */
+@protocol SDWebImageCacheSerializer <NSObject>
+
+/// Provide the image data associated to the image and store to disk cache
+/// @param image The loaded image
+/// @param data The original loaded image data. May be nil when image is transformed (UIImage.sd_isTransformed = YES)
+/// @param imageURL The image URL
+- (nullable NSData *)cacheDataWithImage:(nonnull UIImage *)image originalData:(nullable NSData *)data imageURL:(nullable NSURL *)imageURL;
+
+@end
+
+/**
+ A cache serializer class with block.
+ */
+@interface SDWebImageCacheSerializer : NSObject <SDWebImageCacheSerializer>
+
+- (nonnull instancetype)initWithBlock:(nonnull SDWebImageCacheSerializerBlock)block;
++ (nonnull instancetype)cacheSerializerWithBlock:(nonnull SDWebImageCacheSerializerBlock)block;
+
+- (nonnull instancetype)init NS_UNAVAILABLE;
++ (nonnull instancetype)new  NS_UNAVAILABLE;
+
+@end
diff --git a/SDWebImage/Core/SDWebImageCacheSerializer.m b/SDWebImage/Core/SDWebImageCacheSerializer.m
new file mode 100644
index 000000000..51528e68f
--- /dev/null
+++ b/SDWebImage/Core/SDWebImageCacheSerializer.m
@@ -0,0 +1,39 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCacheSerializer.h"
+
+@interface SDWebImageCacheSerializer ()
+
+@property (nonatomic, copy, nonnull) SDWebImageCacheSerializerBlock block;
+
+@end
+
+@implementation SDWebImageCacheSerializer
+
+- (instancetype)initWithBlock:(SDWebImageCacheSerializerBlock)block {
+    self = [super init];
+    if (self) {
+        self.block = block;
+    }
+    return self;
+}
+
++ (instancetype)cacheSerializerWithBlock:(SDWebImageCacheSerializerBlock)block {
+    SDWebImageCacheSerializer *cacheSerializer = [[SDWebImageCacheSerializer alloc] initWithBlock:block];
+    return cacheSerializer;
+}
+
+- (NSData *)cacheDataWithImage:(UIImage *)image originalData:(NSData *)data imageURL:(nullable NSURL *)imageURL {
+    if (!self.block) {
+        return nil;
+    }
+    return self.block(image, data, imageURL);
+}
+
+@end
diff --git a/SDWebImage/SDWebImageCompat.h b/SDWebImage/Core/SDWebImageCompat.h
similarity index 64%
rename from SDWebImage/SDWebImageCompat.h
rename to SDWebImage/Core/SDWebImageCompat.h
index a4493aebd..9efc7a042 100644
--- a/SDWebImage/SDWebImageCompat.h
+++ b/SDWebImage/Core/SDWebImageCompat.h
@@ -13,23 +13,14 @@
     #error SDWebImage does not support Objective-C Garbage Collection
 #endif
 
-// Apple's defines from TargetConditionals.h are a bit weird.
 // Seems like TARGET_OS_MAC is always defined (on all platforms).
-// To determine if we are running on OSX, we can only rely on TARGET_OS_IPHONE=0 and all the other platforms
-#if !TARGET_OS_IPHONE && !TARGET_OS_IOS && !TARGET_OS_TV && !TARGET_OS_WATCH
+// To determine if we are running on macOS, use TARGET_OS_OSX in Xcode 8
+#if TARGET_OS_OSX
     #define SD_MAC 1
 #else
     #define SD_MAC 0
 #endif
 
-// iOS and tvOS are very similar, UIKit exists on both platforms
-// Note: watchOS also has UIKit, but it's very limited
-#if TARGET_OS_IOS || TARGET_OS_TV
-    #define SD_UIKIT 1
-#else
-    #define SD_UIKIT 0
-#endif
-
 #if TARGET_OS_IOS
     #define SD_IOS 1
 #else
@@ -48,6 +39,20 @@
     #define SD_WATCH 0
 #endif
 
+// Supports Xcode 14 to suppress warning
+#ifdef TARGET_OS_VISION
+#if TARGET_OS_VISION
+    #define SD_VISION 1
+#endif
+#endif
+
+// iOS/tvOS/visionOS are very similar, UIKit exists on both platforms
+// Note: watchOS also has UIKit, but it's very limited
+#if SD_IOS || SD_TV || SD_VISION
+    #define SD_UIKIT 1
+#else
+    #define SD_UIKIT 0
+#endif
 
 #if SD_MAC
     #import <AppKit/AppKit.h>
@@ -60,11 +65,10 @@
     #ifndef UIView
         #define UIView NSView
     #endif
-#else
-    #if __IPHONE_OS_VERSION_MIN_REQUIRED != 20000 && __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_5_0
-        #error SDWebImage doesn't support Deployment Target version < 5.0
+    #ifndef UIColor
+        #define UIColor NSColor
     #endif
-
+#else
     #if SD_UIKIT
         #import <UIKit/UIKit.h>
     #endif
@@ -87,21 +91,12 @@
 #define NS_OPTIONS(_type, _name) enum _name : _type _name; enum _name : _type
 #endif
 
-FOUNDATION_EXPORT UIImage *SDScaledImageForKey(NSString *key, UIImage *image);
-
-typedef void(^SDWebImageNoParamsBlock)(void);
-
-FOUNDATION_EXPORT NSString *const SDWebImageErrorDomain;
-
-#ifndef dispatch_queue_async_safe
-#define dispatch_queue_async_safe(queue, block)\
-    if (dispatch_queue_get_label(DISPATCH_CURRENT_QUEUE_LABEL) == dispatch_queue_get_label(queue)) {\
+#ifndef dispatch_main_async_safe
+#define dispatch_main_async_safe(block)\
+    if (dispatch_queue_get_label(DISPATCH_CURRENT_QUEUE_LABEL) == dispatch_queue_get_label(dispatch_get_main_queue())) {\
         block();\
     } else {\
-        dispatch_async(queue, block);\
+        dispatch_async(dispatch_get_main_queue(), block);\
     }
-#endif
-
-#ifndef dispatch_main_async_safe
-#define dispatch_main_async_safe(block) dispatch_queue_async_safe(dispatch_get_main_queue(), block)
+#pragma clang deprecated(dispatch_main_async_safe, "Use SDCallbackQueue instead")
 #endif
diff --git a/SDWebImage/UIImage+ForceDecode.h b/SDWebImage/Core/SDWebImageCompat.m
similarity index 55%
rename from SDWebImage/UIImage+ForceDecode.h
rename to SDWebImage/Core/SDWebImageCompat.m
index 708c37b0b..12974010f 100644
--- a/SDWebImage/UIImage+ForceDecode.h
+++ b/SDWebImage/Core/SDWebImageCompat.m
@@ -8,10 +8,10 @@
 
 #import "SDWebImageCompat.h"
 
-@interface UIImage (ForceDecode)
+#if !__has_feature(objc_arc)
+    #error SDWebImage is ARC only. Either turn on ARC for the project or use -fobjc-arc flag
+#endif
 
-+ (nullable UIImage *)decodedImageWithImage:(nullable UIImage *)image;
-
-+ (nullable UIImage *)decodedAndScaledDownImageWithImage:(nullable UIImage *)image;
-
-@end
+#if !OS_OBJECT_USE_OBJC
+    #error SDWebImage need ARC for dispatch object
+#endif
diff --git a/SDWebImage/Core/SDWebImageDefine.h b/SDWebImage/Core/SDWebImageDefine.h
new file mode 100644
index 000000000..c1c69d728
--- /dev/null
+++ b/SDWebImage/Core/SDWebImageDefine.h
@@ -0,0 +1,420 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+
+typedef void(^SDWebImageNoParamsBlock)(void);
+/// Image Loading context option
+typedef NSString * SDWebImageContextOption NS_EXTENSIBLE_STRING_ENUM;
+typedef NSDictionary<SDWebImageContextOption, id> SDWebImageContext;
+typedef NSMutableDictionary<SDWebImageContextOption, id> SDWebImageMutableContext;
+
+#pragma mark - Image scale
+
+/**
+ Return the image scale factor for the specify key, supports file name and url key.
+ This is the built-in way to check the scale factor when we have no context about it. Because scale factor is not stored in image data (It's typically from filename).
+ However, you can also provide custom scale factor as well, see `SDWebImageContextImageScaleFactor`.
+
+ @param key The image cache key
+ @return The scale factor for image
+ */
+FOUNDATION_EXPORT CGFloat SDImageScaleFactorForKey(NSString * _Nullable key);
+
+/**
+ Scale the image with the scale factor for the specify key. If no need to scale, return the original image.
+ This works for `UIImage`(UIKit) or `NSImage`(AppKit). And this function also preserve the associated value in `UIImage+Metadata.h`.
+ @note This is actually a convenience function, which firstly call `SDImageScaleFactorForKey` and then call `SDScaledImageForScaleFactor`, kept for backward compatibility.
+
+ @param key The image cache key
+ @param image The image
+ @return The scaled image
+ */
+FOUNDATION_EXPORT UIImage * _Nullable SDScaledImageForKey(NSString * _Nullable key, UIImage * _Nullable image);
+
+/**
+ Scale the image with the scale factor. If no need to scale, return the original image.
+ This works for `UIImage`(UIKit) or `NSImage`(AppKit). And this function also preserve the associated value in `UIImage+Metadata.h`.
+ 
+ @param scale The image scale factor
+ @param image The image
+ @return The scaled image
+ */
+FOUNDATION_EXPORT UIImage * _Nullable SDScaledImageForScaleFactor(CGFloat scale, UIImage * _Nullable image);
+
+#pragma mark - WebCache Options
+
+/// WebCache options
+typedef NS_OPTIONS(NSUInteger, SDWebImageOptions) {
+    /**
+     * By default, when a URL fail to be downloaded, the URL is blacklisted so the library won't keep trying.
+     * This flag disable this blacklisting.
+     */
+    SDWebImageRetryFailed = 1 << 0,
+    
+    /**
+     * By default, image downloads are started during UI interactions, this flags disable this feature,
+     * leading to delayed download on UIScrollView deceleration for instance.
+     */
+    SDWebImageLowPriority = 1 << 1,
+    
+    /**
+     * This flag enables progressive download, the image is displayed progressively during download as a browser would do.
+     * By default, the image is only displayed once completely downloaded.
+     */
+    SDWebImageProgressiveLoad = 1 << 2,
+    
+    /**
+     * Even if the image is cached, respect the HTTP response cache control, and refresh the image from remote location if needed.
+     * The disk caching will be handled by NSURLCache instead of SDWebImage leading to slight performance degradation.
+     * This option helps deal with images changing behind the same request URL, e.g. Facebook graph api profile pics.
+     * If a cached image is refreshed, the completion block is called once with the cached image and again with the final image.
+     *
+     * Use this flag only if you can't make your URLs static with embedded cache busting parameter.
+     */
+    SDWebImageRefreshCached = 1 << 3,
+    
+    /**
+     * In iOS 4+, continue the download of the image if the app goes to background. This is achieved by asking the system for
+     * extra time in background to let the request finish. If the background task expires the operation will be cancelled.
+     */
+    SDWebImageContinueInBackground = 1 << 4,
+    
+    /**
+     * Handles cookies stored in NSHTTPCookieStore by setting
+     * NSMutableURLRequest.HTTPShouldHandleCookies = YES;
+     */
+    SDWebImageHandleCookies = 1 << 5,
+    
+    /**
+     * Enable to allow untrusted SSL certificates.
+     * Useful for testing purposes. Use with caution in production.
+     */
+    SDWebImageAllowInvalidSSLCertificates = 1 << 6,
+    
+    /**
+     * By default, images are loaded in the order in which they were queued. This flag moves them to
+     * the front of the queue.
+     */
+    SDWebImageHighPriority = 1 << 7,
+    
+    /**
+     * By default, placeholder images are loaded while the image is loading. This flag will delay the loading
+     * of the placeholder image until after the image has finished loading.
+     * @note This is used to treate placeholder as an **Error Placeholder** but not **Loading Placeholder** by defaults. if the image loading is cancelled or error, the placeholder will be always set.
+     * @note Therefore, if you want both **Error Placeholder** and **Loading Placeholder** exist, use `SDWebImageAvoidAutoSetImage` to manually set the two placeholders and final loaded image by your hand depends on loading result.
+     * @note This options is UI level options, has no usage on ImageManager or other components.
+     */
+    SDWebImageDelayPlaceholder = 1 << 8,
+    
+    /**
+     * We usually don't apply transform on animated images as most transformers could not manage animated images.
+     * Use this flag to transform them anyway.
+     */
+    SDWebImageTransformAnimatedImage = 1 << 9,
+    
+    /**
+     * By default, image is added to the imageView after download. But in some cases, we want to
+     * have the hand before setting the image (apply a filter or add it with cross-fade animation for instance)
+     * Use this flag if you want to manually set the image in the completion when success
+     * @note This options is UI level options, has no usage on ImageManager or other components.
+     */
+    SDWebImageAvoidAutoSetImage = 1 << 10,
+    
+    /**
+     * By default, images are decoded respecting their original size.
+     * This flag will scale down the images to a size compatible with the constrained memory of devices.
+     * To control the limit memory bytes, check `SDImageCoderHelper.defaultScaleDownLimitBytes` (Defaults to 60MB on iOS)
+     * (from 5.16.0) This will actually translate to use context option `SDWebImageContextImageScaleDownLimitBytes`, which check and calculate the thumbnail pixel size occupied small than limit bytes (including animated image)
+     * (from 5.5.0) This flags effect the progressive and animated images as well
+     * @note If you need detail controls, it's better to use context option `imageScaleDownBytes` instead.
+     * @warning This does not effect the cache key. So which means, this will effect the global cache even next time you query without this option. Pay attention when you use this on global options (It's always recommended to use request-level option for different pipeline)
+     */
+    SDWebImageScaleDownLargeImages = 1 << 11,
+    
+    /**
+     * By default, we do not query image data when the image is already cached in memory. This mask can force to query image data at the same time. However, this query is asynchronously unless you specify `SDWebImageQueryMemoryDataSync`
+     */
+    SDWebImageQueryMemoryData = 1 << 12,
+    
+    /**
+     * By default, when you only specify `SDWebImageQueryMemoryData`, we query the memory image data asynchronously. Combined this mask as well to query the memory image data synchronously.
+     * @note Query data synchronously is not recommend, unless you want to ensure the image is loaded in the same runloop to avoid flashing during cell reusing.
+     */
+    SDWebImageQueryMemoryDataSync = 1 << 13,
+    
+    /**
+     * By default, when the memory cache miss, we query the disk cache asynchronously. This mask can force to query disk cache (when memory cache miss) synchronously.
+     * @note These 3 query options can be combined together. For the full list about these masks combination, see wiki page.
+     * @note Query data synchronously is not recommend, unless you want to ensure the image is loaded in the same runloop to avoid flashing during cell reusing.
+     */
+    SDWebImageQueryDiskDataSync = 1 << 14,
+    
+    /**
+     * By default, when the cache missed, the image is load from the loader. This flag can prevent this to load from cache only.
+     */
+    SDWebImageFromCacheOnly = 1 << 15,
+    
+    /**
+     * By default, we query the cache before the image is load from the loader. This flag can prevent this to load from loader only.
+     */
+    SDWebImageFromLoaderOnly = 1 << 16,
+    
+    /**
+     * By default, when you use `SDWebImageTransition` to do some view transition after the image load finished, this transition is only applied for image when the callback from manager is asynchronous (from network, or disk cache query)
+     * This mask can force to apply view transition for any cases, like memory cache query, or sync disk cache query.
+     * @note This options is UI level options, has no usage on ImageManager or other components.
+     */
+    SDWebImageForceTransition = 1 << 17,
+    
+    /**
+     * By default, we will decode the image in the background during cache query and download from the network. This can help to improve performance because when rendering image on the screen, it need to be firstly decoded. But this happen on the main queue by Core Animation.
+     * However, this process may increase the memory usage as well. If you are experiencing an issue due to excessive memory consumption, This flag can prevent decode the image.
+     * @note 5.14.0 introduce `SDImageCoderDecodeUseLazyDecoding`, use that for better control from codec, instead of post-processing. Which acts the similar like this option but works for SDAnimatedImage as well (this one does not)
+     * @deprecated Deprecated in v5.17.0, if you don't want force-decode, pass [.imageForceDecodePolicy] = SDImageForceDecodePolicy.never.rawValue in context option
+     */
+    SDWebImageAvoidDecodeImage API_DEPRECATED("Use SDWebImageContextImageForceDecodePolicy instead", macos(10.10, 10.10), ios(8.0, 8.0), tvos(9.0, 9.0), watchos(2.0, 2.0)) = 1 << 18,
+    
+    /**
+     * By default, we decode the animated image. This flag can force decode the first frame only and produce the static image.
+     */
+    SDWebImageDecodeFirstFrameOnly = 1 << 19,
+    
+    /**
+     * By default, for `SDAnimatedImage`, we decode the animated image frame during rendering to reduce memory usage. However, you can specify to preload all frames into memory to reduce CPU usage when the animated image is shared by lots of imageViews.
+     * This will actually trigger `preloadAllAnimatedImageFrames` in the background queue(Disk Cache & Download only).
+     */
+    SDWebImagePreloadAllFrames = 1 << 20,
+    
+    /**
+     * By default, when you use `SDWebImageContextAnimatedImageClass` context option (like using `SDAnimatedImageView` which designed to use `SDAnimatedImage`), we may still use `UIImage` when the memory cache hit, or image decoder is not available to produce one exactlly matching your custom class as a fallback solution.
+     * Using this option, can ensure we always callback image with your provided class. If failed to produce one, a error with code `SDWebImageErrorBadImageData` will been used.
+     * Note this options is not compatible with `SDWebImageDecodeFirstFrameOnly`, which always produce a UIImage/NSImage.
+     */
+    SDWebImageMatchAnimatedImageClass = 1 << 21,
+    
+    /**
+     * By default, when we load the image from network, the image will be written to the cache (memory and disk, controlled by your `storeCacheType` context option)
+     * This maybe an asynchronously operation and the final `SDInternalCompletionBlock` callback does not guarantee the disk cache written is finished and may cause logic error. (For example, you modify the disk data just in completion block, however, the disk cache is not ready)
+     * If you need to process with the disk cache in the completion block, you should use this option to ensure the disk cache already been written when callback.
+     * Note if you use this when using the custom cache serializer, or using the transformer, we will also wait until the output image data written is finished.
+     */
+    SDWebImageWaitStoreCache = 1 << 22,
+    
+    /**
+     * We usually don't apply transform on vector images, because vector images supports dynamically changing to any size, rasterize to a fixed size will loss details. To modify vector images, you can process the vector data at runtime (such as modifying PDF tag / SVG element).
+     * Use this flag to transform them anyway.
+     */
+    SDWebImageTransformVectorImage = 1 << 23,
+    
+    /**
+     * By defaults, when you use UI-level category like `sd_setImageWithURL:` on UIImageView, it will cancel the loading image requests.
+     * However, some users may choose to not cancel the loading image requests and always start new pipeline.
+     * Use this flag to disable automatic cancel behavior.
+     * @note This options is UI level options, has no usage on ImageManager or other components.
+     */
+    SDWebImageAvoidAutoCancelImage = 1 << 24,
+    
+    /**
+     * By defaults, for `SDWebImageTransition`, we just submit to UI transition and inmeediatelly callback the final `completedBlock` (`SDExternalCompletionBlock/SDInternalCompletionBlock`).
+     * This may cause un-wanted behavior if you do another transition inside `completedBlock`, because the previous transition is still runnning and un-cancellable, which mass-up the UI status.
+     * For this case, you can pass this option, we will delay the final callback, until your transition end. So when you inside `completedBlock`, no any transition is running on image view and safe to submit new transition.
+     * @note Currently we do not support `pausable/cancellable` transition. But possible in the future by using the https://developer.apple.com/documentation/uikit/uiviewpropertyanimator.
+     * @note If you have complicated transition animation, just use `SDWebImageManager` and do UI state management by yourself, do not use the top-level API (`sd_setImageWithURL:`)
+     */
+    SDWebImageWaitTransition = 1 << 25,
+};
+
+
+#pragma mark - Manager Context Options
+
+/**
+ A String to be used as the operation key for view category to store the image load operation. This is used for view instance which supports different image loading process. If nil, will use the class name as operation key. (NSString *)
+ */
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextSetImageOperationKey;
+
+/**
+ A SDWebImageManager instance to control the image download and cache process using in UIImageView+WebCache category and likes. If not provided, use the shared manager (SDWebImageManager *)
+ @deprecated Deprecated in the future. This context options can be replaced by other context option control like `.imageCache`, `.imageLoader`, `.imageTransformer` (See below), which already matches all the properties in SDWebImageManager.
+ */
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextCustomManager API_DEPRECATED("Use individual context option like .imageCache, .imageLoader and .imageTransformer instead", macos(10.10, API_TO_BE_DEPRECATED), ios(8.0, API_TO_BE_DEPRECATED), tvos(9.0, API_TO_BE_DEPRECATED), watchos(2.0, API_TO_BE_DEPRECATED));
+
+/**
+ A `SDCallbackQueue` instance which controls the `Cache`/`Manager`/`Loader`'s callback queue for their completionBlock.
+ This is useful for user who call these 3 components in non-main queue and want to avoid callback in main queue.
+ @note For UI callback (`sd_setImageWithURL`), we will still use main queue to dispatch, means if you specify a global queue, it will enqueue from the global queue to main queue.
+ @note This does not effect the components' working queue (for example, `Cache` still query disk on internal ioQueue, `Loader` still do network on URLSessionConfiguration.delegateQueue), change those config if you need.
+ Defaults to nil. Which means main queue.
+ */
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextCallbackQueue;
+
+/**
+ A id<SDImageCache> instance which conforms to `SDImageCache` protocol. It's used to override the image manager's cache during the image loading pipeline.
+ In other word, if you just want to specify a custom cache during image loading, you don't need to re-create a dummy SDWebImageManager instance with the cache. If not provided, use the image manager's cache (id<SDImageCache>)
+ */
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextImageCache;
+
+/**
+ A id<SDImageLoader> instance which conforms to `SDImageLoader` protocol. It's used to override the image manager's loader during the image loading pipeline.
+ In other word, if you just want to specify a custom loader during image loading, you don't need to re-create a dummy SDWebImageManager instance with the loader. If not provided, use the image manager's cache (id<SDImageLoader>)
+*/
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextImageLoader;
+
+/**
+ A id<SDImageCoder> instance which conforms to `SDImageCoder` protocol. It's used to override the default image coder for image decoding(including progressive) and encoding during the image loading process.
+ If you use this context option, we will not always use `SDImageCodersManager.shared` to loop through all registered coders and find the suitable one. Instead, we will arbitrarily use the exact provided coder without extra checking (We may not call `canDecodeFromData:`).
+ @note This is only useful for cases which you can ensure the loading url matches your coder, or you find it's too hard to write a common coder which can used for generic usage. This will bind the loading url with the coder logic, which is not always a good design, but possible. (id<SDImageCache>)
+*/
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextImageCoder;
+
+/**
+ A id<SDImageTransformer> instance which conforms `SDImageTransformer` protocol. It's used for image transform after the image load finished and store the transformed image to cache. If you provide one, it will ignore the `transformer` in manager and use provided one instead. If you pass NSNull, the transformer feature will be disabled. (id<SDImageTransformer>)
+ @note When this value is used, we will trigger image transform after downloaded, and the callback's data **will be nil** (because this time the data saved to disk does not match the image return to you. If you need full size data, query the cache with full size url key)
+ */
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextImageTransformer;
+
+#pragma mark - Force Decode Options
+
+/**
+ A  NSNumber instance which store the`SDImageForceDecodePolicy` enum. This is used to control how current image loading should force-decode the decoded image (CGImage, typically). See more what's force-decode means in `SDImageForceDecodePolicy` comment.
+ Defaults to `SDImageForceDecodePolicyAutomatic`, which will detect the input CGImage's metadata, and only force-decode if the input CGImage can not directly render on screen (need extra CoreAnimation Copied Image and increase RAM usage).
+ @note If you want to always the force-decode for this image request, pass `SDImageForceDecodePolicyAlways`, for example, some WebP images which does not created by ImageIO.
+ */
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextImageForceDecodePolicy;
+
+#pragma mark - Image Decoder Context Options
+
+/**
+ A Dictionary (SDImageCoderOptions) value, which pass the extra decoding options to the SDImageCoder. Introduced in SDWebImage 5.14.0
+ You can pass additional decoding related options to the decoder, extensible and control by you. And pay attention this dictionary may be retained by decoded image via `UIImage.sd_decodeOptions` 
+ This context option replace the deprecated `SDImageCoderWebImageContext`, which may cause retain cycle (cache -> image -> options -> context -> cache)
+ @note There are already individual options below like `.imageScaleFactor`, `.imagePreserveAspectRatio`, each of individual options will override the same filed for this dictionary.
+ */
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextImageDecodeOptions;
+
+/**
+ A CGFloat raw value which specify the image scale factor. The number should be greater than or equal to 1.0. If not provide or the number is invalid, we will use the cache key to specify the scale factor. (NSNumber)
+ */
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextImageScaleFactor;
+
+/**
+ A Boolean value indicating whether to keep the original aspect ratio when generating thumbnail images (or bitmap images from vector format).
+ Defaults to YES. (NSNumber)
+ */
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextImagePreserveAspectRatio;
+
+/**
+ A CGSize raw value indicating whether or not to generate the thumbnail images (or bitmap images from vector format). When this value is provided, the decoder will generate a thumbnail image which pixel size is smaller than or equal to (depends the `.imagePreserveAspectRatio`) the value size.
+ @note When you pass `.preserveAspectRatio == NO`, the thumbnail image is stretched to match each dimension. When `.preserveAspectRatio == YES`, the thumbnail image's width is limited to pixel size's width, the thumbnail image's height is limited to pixel size's height. For common cases, you can just pass a square size to limit both.
+ Defaults to CGSizeZero, which means no thumbnail generation at all. (NSValue)
+ @note When this value is used, we will trigger thumbnail decoding for url, and the callback's data **will be nil** (because this time the data saved to disk does not match the image return to you. If you need full size data, query the cache with full size url key)
+ */
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextImageThumbnailPixelSize;
+
+/**
+ A NSString value (UTI) indicating the source image's file extension. Example: "public.jpeg-2000", "com.nikon.raw-image", "public.tiff"
+ Some image file format share the same data structure but has different tag explanation, like TIFF and NEF/SRW, see https://en.wikipedia.org/wiki/TIFF
+ Changing the file extension cause the different image result. The coder (like ImageIO) may use file extension to choose the correct parser
+ @note If you don't provide this option, we will use the `URL.path` as file extension to calculate the UTI hint
+ @note If you really don't want any hint which effect the image result, pass `NSNull.null` instead
+ */
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextImageTypeIdentifierHint;
+
+/**
+ A NSUInteger value to provide the limit bytes during decoding. This can help to avoid OOM on large frame count animated image or large pixel static image when you don't know how much RAM it occupied before decoding
+ The decoder will do these logic based on limit bytes:
+ 1. Get the total frame count (static image means 1)
+ 2. Calculate the `framePixelSize` width/height to `sqrt(limitBytes / frameCount / bytesPerPixel)`, keeping aspect ratio (at least 1x1)
+ 3. If the `framePixelSize < originalImagePixelSize`, then do thumbnail decoding (see `SDImageCoderDecodeThumbnailPixelSize`) use the `framePixelSize` and `preseveAspectRatio = YES`
+ 4. Else, use the full pixel decoding (small than limit bytes)
+ 5. Whatever result, this does not effect the animated/static behavior of image. So even if you set `limitBytes = 1 && frameCount = 100`, we will stll create animated image with each frame `1x1` pixel size.
+ @note This option has higher priority than `.imageThumbnailPixelSize`
+ @warning This does not effect the cache key. So which means, this will effect the global cache even next time you query without this option. Pay attention when you use this on global options (It's always recommended to use request-level option for different pipeline)
+ */
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextImageScaleDownLimitBytes;
+
+/**
+ A Boolean value (NSNumber) to provide converting to HDR during decoding. Currently if number is 0, use SDR, else use HDR. But we may extend this option to use `NSUInteger` in the future (means, think this options as int number, but not actual boolean)
+ @note Supported by iOS 17 and above when using ImageIO coder (third-party coder can support lower firmware)
+ Defaults to @(NO), decoder will automatically convert SDR.
+ */
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextImageDecodeToHDR;
+
+#pragma mark - Cache Context Options
+
+/**
+ A Dictionary (SDImageCoderOptions) value, which pass the extra encode options to the SDImageCoder. Introduced in SDWebImage 5.15.0
+ You can pass encode options like `compressionQuality`, `maxFileSize`, `maxPixelSize` to control the encoding related thing, this is used inside `SDImageCache` during store logic.
+ @note For developer who use custom cache protocol (not SDImageCache instance), they need to upgrade and use these options for encoding.
+ */
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextImageEncodeOptions;
+
+/**
+ A SDImageCacheType raw value which specify the source of cache to query. Specify `SDImageCacheTypeDisk` to query from disk cache only; `SDImageCacheTypeMemory` to query from memory only. And `SDImageCacheTypeAll` to query from both memory cache and disk cache. Specify `SDImageCacheTypeNone` is invalid and totally ignore the cache query.
+ If not provide or the value is invalid, we will use `SDImageCacheTypeAll`. (NSNumber)
+ */
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextQueryCacheType;
+
+/**
+ A SDImageCacheType raw value which specify the store cache type when the image has just been downloaded and will be stored to the cache. Specify `SDImageCacheTypeNone` to disable cache storage; `SDImageCacheTypeDisk` to store in disk cache only; `SDImageCacheTypeMemory` to store in memory only. And `SDImageCacheTypeAll` to store in both memory cache and disk cache.
+ If you use image transformer feature, this actually apply for the transformed image, but not the original image itself. Use `SDWebImageContextOriginalStoreCacheType` if you want to control the original image's store cache type at the same time.
+ If not provide or the value is invalid, we will use `SDImageCacheTypeAll`. (NSNumber)
+ */
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextStoreCacheType;
+
+/**
+ The same behavior like `SDWebImageContextQueryCacheType`, but control the query cache type for the original image when you use image transformer feature. This allows the detail control of cache query for these two images. For example, if you want to query the transformed image from both memory/disk cache, query the original image from disk cache only, use `[.queryCacheType : .all, .originalQueryCacheType : .disk]`
+ If not provide or the value is invalid, we will use `SDImageCacheTypeDisk`, which query the original full image data from disk cache after transformed image cache miss. This is suitable for most common cases to avoid re-downloading the full data for different transform variants. (NSNumber)
+ @note Which means, if you set this value to not be `.none`, we will query the original image from cache, then do transform with transformer, instead of actual downloading, which can save bandwidth usage.
+ */
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextOriginalQueryCacheType;
+
+/**
+ The same behavior like `SDWebImageContextStoreCacheType`, but control the store cache type for the original image when you use image transformer feature. This allows the detail control of cache storage for these two images. For example, if you want to store the transformed image into both memory/disk cache, store the original image into disk cache only, use `[.storeCacheType : .all, .originalStoreCacheType : .disk]`
+ If not provide or the value is invalid, we will use `SDImageCacheTypeDisk`, which store the original full image data into disk cache after storing the transformed image. This is suitable for most common cases to avoid re-downloading the full data for different transform variants. (NSNumber)
+ @note This only store the original image, if you want to use the original image without downloading in next query, specify `SDWebImageContextOriginalQueryCacheType` as well.
+ */
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextOriginalStoreCacheType;
+
+/**
+ A id<SDImageCache> instance which conforms to `SDImageCache` protocol. It's used to control the cache for original image when using the transformer. If you provide one, the original image (full size image) will query and write from that cache instance instead, the transformed image will query and write from the default `SDWebImageContextImageCache` instead. (id<SDImageCache>)
+ */
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextOriginalImageCache;
+
+/**
+ A Class object which the instance is a `UIImage/NSImage` subclass and adopt `SDAnimatedImage` protocol. We will call `initWithData:scale:options:` to create the instance (or `initWithAnimatedCoder:scale:` when using progressive download) . If the instance create failed, fallback to normal `UIImage/NSImage`.
+ This can be used to improve animated images rendering performance (especially memory usage on big animated images) with `SDAnimatedImageView` (Class).
+ */
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextAnimatedImageClass;
+
+#pragma mark - Download Context Options
+
+/**
+ A id<SDWebImageDownloaderRequestModifier> instance to modify the image download request. It's used for downloader to modify the original request from URL and options. If you provide one, it will ignore the `requestModifier` in downloader and use provided one instead. (id<SDWebImageDownloaderRequestModifier>)
+ */
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextDownloadRequestModifier;
+
+/**
+ A id<SDWebImageDownloaderResponseModifier> instance to modify the image download response. It's used for downloader to modify the original response from URL and options.  If you provide one, it will ignore the `responseModifier` in downloader and use provided one instead. (id<SDWebImageDownloaderResponseModifier>)
+ */
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextDownloadResponseModifier;
+
+/**
+ A id<SDWebImageContextDownloadDecryptor> instance to decrypt the image download data. This can be used for image data decryption, such as Base64 encoded image. If you provide one, it will ignore the `decryptor` in downloader and use provided one instead. (id<SDWebImageContextDownloadDecryptor>)
+ */
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextDownloadDecryptor;
+
+/**
+ A id<SDWebImageCacheKeyFilter> instance to convert an URL into a cache key. It's used when manager need cache key to use image cache. If you provide one, it will ignore the `cacheKeyFilter` in manager and use provided one instead. (id<SDWebImageCacheKeyFilter>)
+ */
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextCacheKeyFilter;
+
+/**
+ A id<SDWebImageCacheSerializer> instance to convert the decoded image, the source downloaded data, to the actual data. It's used for manager to store image to the disk cache. If you provide one, it will ignore the `cacheSerializer` in manager and use provided one instead. (id<SDWebImageCacheSerializer>)
+ */
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextCacheSerializer;
diff --git a/SDWebImage/Core/SDWebImageDefine.m b/SDWebImage/Core/SDWebImageDefine.m
new file mode 100644
index 000000000..b6b5034b4
--- /dev/null
+++ b/SDWebImage/Core/SDWebImageDefine.m
@@ -0,0 +1,163 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageDefine.h"
+#import "UIImage+Metadata.h"
+#import "NSImage+Compatibility.h"
+#import "SDAnimatedImage.h"
+#import "SDAssociatedObject.h"
+
+#pragma mark - Image scale
+
+static inline NSArray<NSNumber *> * _Nonnull SDImageScaleFactors(void) {
+    return @[@2, @3];
+}
+
+inline CGFloat SDImageScaleFactorForKey(NSString * _Nullable key) {
+    CGFloat scale = 1;
+    if (!key) {
+        return scale;
+    }
+    // Now all OS supports retina display scale system
+    {
+        // a@2x.png -> 8
+        if (key.length >= 8) {
+            // Fast check
+            BOOL isURL = [key hasPrefix:@"http://"] || [key hasPrefix:@"https://"];
+            for (NSNumber *scaleFactor in SDImageScaleFactors()) {
+                // @2x. for file name and normal url
+                NSString *fileScale = [NSString stringWithFormat:@"@%@x.", scaleFactor];
+                if ([key containsString:fileScale]) {
+                    scale = scaleFactor.doubleValue;
+                    return scale;
+                }
+                if (isURL) {
+                    // %402x. for url encode
+                    NSString *urlScale = [NSString stringWithFormat:@"%%40%@x.", scaleFactor];
+                    if ([key containsString:urlScale]) {
+                        scale = scaleFactor.doubleValue;
+                        return scale;
+                    }
+                }
+            }
+        }
+    }
+    return scale;
+}
+
+inline UIImage * _Nullable SDScaledImageForKey(NSString * _Nullable key, UIImage * _Nullable image) {
+    if (!image) {
+        return nil;
+    }
+    CGFloat scale = SDImageScaleFactorForKey(key);
+    return SDScaledImageForScaleFactor(scale, image);
+}
+
+inline UIImage * _Nullable SDScaledImageForScaleFactor(CGFloat scale, UIImage * _Nullable image) {
+    if (!image) {
+        return nil;
+    }
+    if (scale <= 1) {
+        return image;
+    }
+    if (scale == image.scale) {
+        return image;
+    }
+    UIImage *scaledImage;
+    // Check SDAnimatedImage support for shortcut
+    if ([image.class conformsToProtocol:@protocol(SDAnimatedImage)]) {
+        if ([image respondsToSelector:@selector(animatedCoder)]) {
+            id<SDAnimatedImageCoder> coder = [(id<SDAnimatedImage>)image animatedCoder];
+            if (coder) {
+                scaledImage = [[image.class alloc] initWithAnimatedCoder:coder scale:scale];
+            }
+        } else {
+            // Some class impl does not support `animatedCoder`, keep for compatibility
+            NSData *data = [(id<SDAnimatedImage>)image animatedImageData];
+            if (data) {
+                scaledImage = [[image.class alloc] initWithData:data scale:scale];
+            }
+        }
+    }
+    if (scaledImage) {
+        SDImageCopyAssociatedObject(image, scaledImage);
+        return scaledImage;
+    }
+    if (image.sd_isAnimated) {
+        UIImage *animatedImage;
+#if SD_UIKIT || SD_WATCH
+        // `UIAnimatedImage` images share the same size and scale.
+        NSArray<UIImage *> *images = image.images;
+        NSMutableArray<UIImage *> *scaledImages = [NSMutableArray arrayWithCapacity:images.count];
+        
+        for (UIImage *tempImage in images) {
+            UIImage *tempScaledImage = [[UIImage alloc] initWithCGImage:tempImage.CGImage scale:scale orientation:tempImage.imageOrientation];
+            [scaledImages addObject:tempScaledImage];
+        }
+        
+        animatedImage = [UIImage animatedImageWithImages:scaledImages duration:image.duration];
+#else
+        // Animated GIF for `NSImage` need to grab `NSBitmapImageRep`;
+        NSRect imageRect = NSMakeRect(0, 0, image.size.width, image.size.height);
+        NSImageRep *imageRep = [image bestRepresentationForRect:imageRect context:nil hints:nil];
+        NSBitmapImageRep *bitmapImageRep;
+        if ([imageRep isKindOfClass:[NSBitmapImageRep class]]) {
+            bitmapImageRep = (NSBitmapImageRep *)imageRep;
+        }
+        if (bitmapImageRep) {
+            NSSize size = NSMakeSize(image.size.width / scale, image.size.height / scale);
+            animatedImage = [[NSImage alloc] initWithSize:size];
+            bitmapImageRep.size = size;
+            [animatedImage addRepresentation:bitmapImageRep];
+        }
+#endif
+        scaledImage = animatedImage;
+    } else {
+#if SD_UIKIT || SD_WATCH
+        scaledImage = [[UIImage alloc] initWithCGImage:image.CGImage scale:scale orientation:image.imageOrientation];
+#else
+        scaledImage = [[UIImage alloc] initWithCGImage:image.CGImage scale:scale orientation:kCGImagePropertyOrientationUp];
+#endif
+    }
+    if (scaledImage) {
+        SDImageCopyAssociatedObject(image, scaledImage);
+        return scaledImage;
+    }
+    
+    return nil;
+}
+
+#pragma mark - Context option
+
+SDWebImageContextOption const SDWebImageContextSetImageOperationKey = @"setImageOperationKey";
+SDWebImageContextOption const SDWebImageContextCustomManager = @"customManager";
+SDWebImageContextOption const SDWebImageContextCallbackQueue = @"callbackQueue";
+SDWebImageContextOption const SDWebImageContextImageCache = @"imageCache";
+SDWebImageContextOption const SDWebImageContextImageLoader = @"imageLoader";
+SDWebImageContextOption const SDWebImageContextImageCoder = @"imageCoder";
+SDWebImageContextOption const SDWebImageContextImageTransformer = @"imageTransformer";
+SDWebImageContextOption const SDWebImageContextImageForceDecodePolicy = @"imageForceDecodePolicy";
+SDWebImageContextOption const SDWebImageContextImageDecodeOptions = @"imageDecodeOptions";
+SDWebImageContextOption const SDWebImageContextImageScaleFactor = @"imageScaleFactor";
+SDWebImageContextOption const SDWebImageContextImagePreserveAspectRatio = @"imagePreserveAspectRatio";
+SDWebImageContextOption const SDWebImageContextImageThumbnailPixelSize = @"imageThumbnailPixelSize";
+SDWebImageContextOption const SDWebImageContextImageTypeIdentifierHint = @"imageTypeIdentifierHint";
+SDWebImageContextOption const SDWebImageContextImageScaleDownLimitBytes = @"imageScaleDownLimitBytes";
+SDWebImageContextOption const SDWebImageContextImageDecodeToHDR = @"imageDecodeToHDR";
+SDWebImageContextOption const SDWebImageContextImageEncodeOptions = @"imageEncodeOptions";
+SDWebImageContextOption const SDWebImageContextQueryCacheType = @"queryCacheType";
+SDWebImageContextOption const SDWebImageContextStoreCacheType = @"storeCacheType";
+SDWebImageContextOption const SDWebImageContextOriginalQueryCacheType = @"originalQueryCacheType";
+SDWebImageContextOption const SDWebImageContextOriginalStoreCacheType = @"originalStoreCacheType";
+SDWebImageContextOption const SDWebImageContextOriginalImageCache = @"originalImageCache";
+SDWebImageContextOption const SDWebImageContextAnimatedImageClass = @"animatedImageClass";
+SDWebImageContextOption const SDWebImageContextDownloadRequestModifier = @"downloadRequestModifier";
+SDWebImageContextOption const SDWebImageContextDownloadResponseModifier = @"downloadResponseModifier";
+SDWebImageContextOption const SDWebImageContextDownloadDecryptor = @"downloadDecryptor";
+SDWebImageContextOption const SDWebImageContextCacheKeyFilter = @"cacheKeyFilter";
+SDWebImageContextOption const SDWebImageContextCacheSerializer = @"cacheSerializer";
diff --git a/SDWebImage/Core/SDWebImageDownloader.h b/SDWebImage/Core/SDWebImageDownloader.h
new file mode 100644
index 000000000..eec3fc181
--- /dev/null
+++ b/SDWebImage/Core/SDWebImageDownloader.h
@@ -0,0 +1,320 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCompat.h"
+#import "SDWebImageDefine.h"
+#import "SDWebImageOperation.h"
+#import "SDWebImageDownloaderConfig.h"
+#import "SDWebImageDownloaderRequestModifier.h"
+#import "SDWebImageDownloaderResponseModifier.h"
+#import "SDWebImageDownloaderDecryptor.h"
+#import "SDImageLoader.h"
+
+/// Downloader options
+typedef NS_OPTIONS(NSUInteger, SDWebImageDownloaderOptions) {
+    /**
+     * Put the download in the low queue priority and task priority.
+     */
+    SDWebImageDownloaderLowPriority = 1 << 0,
+    
+    /**
+     * This flag enables progressive download, the image is displayed progressively during download as a browser would do.
+     */
+    SDWebImageDownloaderProgressiveLoad = 1 << 1,
+
+    /**
+     * By default, request prevent the use of NSURLCache. With this flag, NSURLCache
+     * is used with default policies.
+     */
+    SDWebImageDownloaderUseNSURLCache = 1 << 2,
+
+    /**
+     * Call completion block with nil image/imageData if the image was read from NSURLCache
+     * And the error code is `SDWebImageErrorCacheNotModified`
+     * This flag should be combined with `SDWebImageDownloaderUseNSURLCache`.
+     */
+    SDWebImageDownloaderIgnoreCachedResponse = 1 << 3,
+    
+    /**
+     * In iOS 4+, continue the download of the image if the app goes to background. This is achieved by asking the system for
+     * extra time in background to let the request finish. If the background task expires the operation will be cancelled.
+     */
+    SDWebImageDownloaderContinueInBackground = 1 << 4,
+
+    /**
+     * Handles cookies stored in NSHTTPCookieStore by setting 
+     * NSMutableURLRequest.HTTPShouldHandleCookies = YES;
+     */
+    SDWebImageDownloaderHandleCookies = 1 << 5,
+
+    /**
+     * Enable to allow untrusted SSL certificates.
+     * Useful for testing purposes. Use with caution in production.
+     */
+    SDWebImageDownloaderAllowInvalidSSLCertificates = 1 << 6,
+
+    /**
+     * Put the download in the high queue priority and task priority.
+     */
+    SDWebImageDownloaderHighPriority = 1 << 7,
+    
+    /**
+     * By default, images are decoded respecting their original size. On iOS, this flag will scale down the
+     * images to a size compatible with the constrained memory of devices.
+     * This flag take no effect if `SDWebImageDownloaderAvoidDecodeImage` is set. And it will be ignored if `SDWebImageDownloaderProgressiveLoad` is set.
+     */
+    SDWebImageDownloaderScaleDownLargeImages = 1 << 8,
+    
+    /**
+     * By default, we will decode the image in the background during cache query and download from the network. This can help to improve performance because when rendering image on the screen, it need to be firstly decoded. But this happen on the main queue by Core Animation.
+     * However, this process may increase the memory usage as well. If you are experiencing a issue due to excessive memory consumption, This flag can prevent decode the image.
+     * @note 5.14.0 introduce `SDImageCoderDecodeUseLazyDecoding`, use that for better control from codec, instead of post-processing. Which acts the similar like this option but works for SDAnimatedImage as well (this one does not)
+     * @deprecated Deprecated in v5.17.0, if you don't want force-decode, pass [.imageForceDecodePolicy] = SDImageForceDecodePolicy.never.rawValue in context option
+     */
+    SDWebImageDownloaderAvoidDecodeImage API_DEPRECATED("Use SDWebImageContextImageForceDecodePolicy instead", macos(10.10, 10.10), ios(8.0, 8.0), tvos(9.0, 9.0), watchos(2.0, 2.0)) = 1 << 9,
+    
+    /**
+     * By default, we decode the animated image. This flag can force decode the first frame only and produce the static image.
+     */
+    SDWebImageDownloaderDecodeFirstFrameOnly = 1 << 10,
+    
+    /**
+     * By default, for `SDAnimatedImage`, we decode the animated image frame during rendering to reduce memory usage. This flag actually trigger `preloadAllAnimatedImageFrames = YES` after image load from network
+     */
+    SDWebImageDownloaderPreloadAllFrames = 1 << 11,
+    
+    /**
+     * By default, when you use `SDWebImageContextAnimatedImageClass` context option (like using `SDAnimatedImageView` which designed to use `SDAnimatedImage`), we may still use `UIImage` when the memory cache hit, or image decoder is not available, to behave as a fallback solution.
+     * Using this option, can ensure we always produce image with your provided class. If failed, a error with code `SDWebImageErrorBadImageData` will been used.
+     * Note this options is not compatible with `SDWebImageDownloaderDecodeFirstFrameOnly`, which always produce a UIImage/NSImage.
+     */
+    SDWebImageDownloaderMatchAnimatedImageClass = 1 << 12,
+};
+
+/// Posed when URLSessionTask started (`resume` called))
+FOUNDATION_EXPORT NSNotificationName _Nonnull const SDWebImageDownloadStartNotification;
+/// Posed when URLSessionTask get HTTP response (`didReceiveResponse:completionHandler:` called)
+FOUNDATION_EXPORT NSNotificationName _Nonnull const SDWebImageDownloadReceiveResponseNotification;
+/// Posed when URLSessionTask stoped (`didCompleteWithError:` with error or `cancel` called)
+FOUNDATION_EXPORT NSNotificationName _Nonnull const SDWebImageDownloadStopNotification;
+/// Posed when URLSessionTask finished with success  (`didCompleteWithError:` without error)
+FOUNDATION_EXPORT NSNotificationName _Nonnull const SDWebImageDownloadFinishNotification;
+
+typedef SDImageLoaderProgressBlock SDWebImageDownloaderProgressBlock;
+typedef SDImageLoaderCompletedBlock SDWebImageDownloaderCompletedBlock;
+
+/**
+ *  A token associated with each download. Can be used to cancel a download
+ */
+@interface SDWebImageDownloadToken : NSObject <SDWebImageOperation>
+
+/**
+ Cancel the current download.
+ */
+- (void)cancel;
+
+/**
+ The download's URL.
+ */
+@property (nonatomic, strong, nullable, readonly) NSURL *url;
+
+/**
+ The download's request.
+ */
+@property (nonatomic, strong, nullable, readonly) NSURLRequest *request;
+
+/**
+ The download's response.
+ */
+@property (nonatomic, strong, nullable, readonly) NSURLResponse *response;
+
+/**
+ The download's metrics. This will be nil if download operation does not support metrics.
+ */
+@property (nonatomic, strong, nullable, readonly) NSURLSessionTaskMetrics *metrics API_AVAILABLE(macos(10.12), ios(10.0), watchos(3.0), tvos(10.0));
+
+@end
+
+
+/**
+ * Asynchronous downloader dedicated and optimized for image loading.
+ */
+@interface SDWebImageDownloader : NSObject
+
+/**
+ * Downloader Config object - storing all kind of settings.
+ * Most config properties support dynamic changes during download, except something like `sessionConfiguration`, see `SDWebImageDownloaderConfig` for more detail.
+ */
+@property (nonatomic, copy, readonly, nonnull) SDWebImageDownloaderConfig *config;
+
+/**
+ * Set the request modifier to modify the original download request before image load.
+ * This request modifier method will be called for each downloading image request. Return the original request means no modification. Return nil will cancel the download request.
+ * Defaults to nil, means does not modify the original download request.
+ * @note If you want to modify single request, consider using `SDWebImageContextDownloadRequestModifier` context option.
+ */
+@property (nonatomic, strong, nullable) id<SDWebImageDownloaderRequestModifier> requestModifier;
+
+/**
+ * Set the response modifier to modify the original download response during image load.
+ * This response modifier method will be called for each downloading image response. Return the original response means no modification. Return nil will mark current download as cancelled.
+ * Defaults to nil, means does not modify the original download response.
+ * @note If you want to modify single response, consider using `SDWebImageContextDownloadResponseModifier` context option.
+ */
+@property (nonatomic, strong, nullable) id<SDWebImageDownloaderResponseModifier> responseModifier;
+
+/**
+ * Set the decryptor to decrypt the original download data before image decoding. This can be used for encrypted image data, like Base64.
+ * This decryptor method will be called for each downloading image data. Return the original data means no modification. Return nil will mark this download failed.
+ * Defaults to nil, means does not modify the original download data.
+ * @note When using decryptor, progressive decoding will be disabled, to avoid data corrupt issue.
+ * @note If you want to decrypt single download data, consider using `SDWebImageContextDownloadDecryptor` context option.
+ */
+@property (nonatomic, strong, nullable) id<SDWebImageDownloaderDecryptor> decryptor;
+
+/**
+ * The configuration in use by the internal NSURLSession. If you want to provide a custom sessionConfiguration, use `SDWebImageDownloaderConfig.sessionConfiguration` and create a new downloader instance.
+ @note This is immutable according to NSURLSession's documentation. Mutating this object directly has no effect.
+ */
+@property (nonatomic, readonly, nonnull) NSURLSessionConfiguration *sessionConfiguration;
+
+/**
+ * Gets/Sets the download queue suspension state.
+ */
+@property (nonatomic, assign, getter=isSuspended) BOOL suspended;
+
+/**
+ * Shows the current amount of downloads that still need to be downloaded
+ */
+@property (nonatomic, assign, readonly) NSUInteger currentDownloadCount;
+
+/**
+ *  Returns the global shared downloader instance. Which use the `SDWebImageDownloaderConfig.defaultDownloaderConfig` config.
+ */
+@property (nonatomic, class, readonly, nonnull) SDWebImageDownloader *sharedDownloader;
+
+/**
+ Creates an instance of a downloader with specified downloader config.
+ You can specify session configuration, timeout or operation class through downloader config.
+
+ @param config The downloader config. If you specify nil, the `defaultDownloaderConfig` will be used.
+ @return new instance of downloader class
+ */
+- (nonnull instancetype)initWithConfig:(nullable SDWebImageDownloaderConfig *)config NS_DESIGNATED_INITIALIZER;
+
+/**
+ * Set a value for a HTTP header to be appended to each download HTTP request.
+ *
+ * @param value The value for the header field. Use `nil` value to remove the header field.
+ * @param field The name of the header field to set.
+ */
+- (void)setValue:(nullable NSString *)value forHTTPHeaderField:(nullable NSString *)field;
+
+/**
+ * Returns the value of the specified HTTP header field.
+ *
+ * @return The value associated with the header field field, or `nil` if there is no corresponding header field.
+ */
+- (nullable NSString *)valueForHTTPHeaderField:(nullable NSString *)field;
+
+/**
+ * Creates a SDWebImageDownloader async downloader instance with a given URL
+ *
+ * The delegate will be informed when the image is finish downloaded or an error has happen.
+ *
+ * @see SDWebImageDownloaderDelegate
+ *
+ * @param url            The URL to the image to download
+ * @param completedBlock A block called once the download is completed.
+ *                       If the download succeeded, the image parameter is set, in case of error,
+ *                       error parameter is set with the error. The last parameter is always YES
+ *                       if SDWebImageDownloaderProgressiveDownload isn't use. With the
+ *                       SDWebImageDownloaderProgressiveDownload option, this block is called
+ *                       repeatedly with the partial image object and the finished argument set to NO
+ *                       before to be called a last time with the full image and finished argument
+ *                       set to YES. In case of error, the finished argument is always YES.
+ *
+ * @return A token (SDWebImageDownloadToken) that can be used to cancel this operation
+ */
+- (nullable SDWebImageDownloadToken *)downloadImageWithURL:(nullable NSURL *)url
+                                                 completed:(nullable SDWebImageDownloaderCompletedBlock)completedBlock;
+
+/**
+ * Creates a SDWebImageDownloader async downloader instance with a given URL
+ *
+ * The delegate will be informed when the image is finish downloaded or an error has happen.
+ *
+ * @see SDWebImageDownloaderDelegate
+ *
+ * @param url            The URL to the image to download
+ * @param options        The options to be used for this download
+ * @param progressBlock  A block called repeatedly while the image is downloading
+ *                       @note the progress block is executed on a background queue
+ * @param completedBlock A block called once the download is completed.
+ *                       If the download succeeded, the image parameter is set, in case of error,
+ *                       error parameter is set with the error. The last parameter is always YES
+ *                       if SDWebImageDownloaderProgressiveLoad isn't use. With the
+ *                       SDWebImageDownloaderProgressiveLoad option, this block is called
+ *                       repeatedly with the partial image object and the finished argument set to NO
+ *                       before to be called a last time with the full image and finished argument
+ *                       set to YES. In case of error, the finished argument is always YES.
+ *
+ * @return A token (SDWebImageDownloadToken) that can be used to cancel this operation
+ */
+- (nullable SDWebImageDownloadToken *)downloadImageWithURL:(nullable NSURL *)url
+                                                   options:(SDWebImageDownloaderOptions)options
+                                                  progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                                                 completed:(nullable SDWebImageDownloaderCompletedBlock)completedBlock;
+
+/**
+ * Creates a SDWebImageDownloader async downloader instance with a given URL
+ *
+ * The delegate will be informed when the image is finish downloaded or an error has happen.
+ *
+ * @see SDWebImageDownloaderDelegate
+ *
+ * @param url            The URL to the image to download
+ * @param options        The options to be used for this download
+ * @param context        A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
+ * @param progressBlock  A block called repeatedly while the image is downloading
+ *                       @note the progress block is executed on a background queue
+ * @param completedBlock A block called once the download is completed.
+ *
+ * @return A token (SDWebImageDownloadToken) that can be used to cancel this operation
+ */
+- (nullable SDWebImageDownloadToken *)downloadImageWithURL:(nullable NSURL *)url
+                                                   options:(SDWebImageDownloaderOptions)options
+                                                   context:(nullable SDWebImageContext *)context
+                                                  progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                                                 completed:(nullable SDWebImageDownloaderCompletedBlock)completedBlock;
+
+/**
+ * Cancels all download operations in the queue
+ */
+- (void)cancelAllDownloads;
+
+/**
+ * Invalidates the managed session, optionally canceling pending operations.
+ * @note If you use custom downloader instead of the shared downloader, you need call this method when you do not use it to avoid memory leak
+ * @param cancelPendingOperations Whether or not to cancel pending operations.
+ * @note Calling this method on the shared downloader has no effect.
+ */
+- (void)invalidateSessionAndCancel:(BOOL)cancelPendingOperations;
+
+@end
+
+
+/**
+ SDWebImageDownloader is the built-in image loader conform to `SDImageLoader`. Which provide the HTTP/HTTPS/FTP download, or local file URL using NSURLSession.
+ However, this downloader class itself also support customization for advanced users. You can specify `operationClass` in download config to custom download operation, See `SDWebImageDownloaderOperation`.
+ If you want to provide some image loader which beyond network or local file, consider to create your own custom class conform to `SDImageLoader`.
+ */
+@interface SDWebImageDownloader (SDImageLoader) <SDImageLoader>
+
+@end
diff --git a/SDWebImage/Core/SDWebImageDownloader.m b/SDWebImage/Core/SDWebImageDownloader.m
new file mode 100644
index 000000000..6628afdc7
--- /dev/null
+++ b/SDWebImage/Core/SDWebImageDownloader.m
@@ -0,0 +1,665 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageDownloader.h"
+#import "SDWebImageDownloaderConfig.h"
+#import "SDWebImageDownloaderOperation.h"
+#import "SDWebImageError.h"
+#import "SDWebImageCacheKeyFilter.h"
+#import "SDImageCacheDefine.h"
+#import "SDInternalMacros.h"
+#import "objc/runtime.h"
+
+NSNotificationName const SDWebImageDownloadStartNotification = @"SDWebImageDownloadStartNotification";
+NSNotificationName const SDWebImageDownloadReceiveResponseNotification = @"SDWebImageDownloadReceiveResponseNotification";
+NSNotificationName const SDWebImageDownloadStopNotification = @"SDWebImageDownloadStopNotification";
+NSNotificationName const SDWebImageDownloadFinishNotification = @"SDWebImageDownloadFinishNotification";
+
+static void * SDWebImageDownloaderContext = &SDWebImageDownloaderContext;
+
+@interface SDWebImageDownloadToken ()
+
+@property (nonatomic, strong, nullable, readwrite) NSURL *url;
+@property (nonatomic, strong, nullable, readwrite) NSURLRequest *request;
+@property (nonatomic, strong, nullable, readwrite) NSURLResponse *response;
+@property (nonatomic, strong, nullable, readwrite) NSURLSessionTaskMetrics *metrics API_AVAILABLE(macos(10.12), ios(10.0), watchos(3.0), tvos(10.0));
+@property (nonatomic, weak, nullable, readwrite) id downloadOperationCancelToken;
+@property (nonatomic, weak, nullable) NSOperation<SDWebImageDownloaderOperation> *downloadOperation;
+@property (nonatomic, assign, getter=isCancelled) BOOL cancelled;
+
+- (nonnull instancetype)init NS_UNAVAILABLE;
++ (nonnull instancetype)new  NS_UNAVAILABLE;
+- (nonnull instancetype)initWithDownloadOperation:(nullable NSOperation<SDWebImageDownloaderOperation> *)downloadOperation;
+
+@end
+
+@interface SDWebImageDownloader () <NSURLSessionTaskDelegate, NSURLSessionDataDelegate>
+
+@property (strong, nonatomic, nonnull) NSOperationQueue *downloadQueue;
+@property (strong, nonatomic, nonnull) NSMutableDictionary<NSURL *, NSOperation<SDWebImageDownloaderOperation> *> *URLOperations;
+@property (strong, nonatomic, nullable) NSMutableDictionary<NSString *, NSString *> *HTTPHeaders;
+
+// The session in which data tasks will run
+@property (strong, nonatomic) NSURLSession *session;
+
+@end
+
+@implementation SDWebImageDownloader {
+    SD_LOCK_DECLARE(_HTTPHeadersLock); // A lock to keep the access to `HTTPHeaders` thread-safe
+    SD_LOCK_DECLARE(_operationsLock); // A lock to keep the access to `URLOperations` thread-safe
+}
+
++ (void)initialize {
+    // Bind SDNetworkActivityIndicator if available (download it here: http://github.com/rs/SDNetworkActivityIndicator )
+    // To use it, just add #import "SDNetworkActivityIndicator.h" in addition to the SDWebImage import
+    if (NSClassFromString(@"SDNetworkActivityIndicator")) {
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
+        id activityIndicator = [NSClassFromString(@"SDNetworkActivityIndicator") performSelector:NSSelectorFromString(@"sharedActivityIndicator")];
+#pragma clang diagnostic pop
+
+        // Remove observer in case it was previously added.
+        [[NSNotificationCenter defaultCenter] removeObserver:activityIndicator name:SDWebImageDownloadStartNotification object:nil];
+        [[NSNotificationCenter defaultCenter] removeObserver:activityIndicator name:SDWebImageDownloadStopNotification object:nil];
+
+        [[NSNotificationCenter defaultCenter] addObserver:activityIndicator
+                                                 selector:NSSelectorFromString(@"startActivity")
+                                                     name:SDWebImageDownloadStartNotification object:nil];
+        [[NSNotificationCenter defaultCenter] addObserver:activityIndicator
+                                                 selector:NSSelectorFromString(@"stopActivity")
+                                                     name:SDWebImageDownloadStopNotification object:nil];
+    }
+}
+
++ (nonnull instancetype)sharedDownloader {
+    static dispatch_once_t once;
+    static id instance;
+    dispatch_once(&once, ^{
+        instance = [self new];
+    });
+    return instance;
+}
+
+- (nonnull instancetype)init {
+    return [self initWithConfig:SDWebImageDownloaderConfig.defaultDownloaderConfig];
+}
+
+- (instancetype)initWithConfig:(SDWebImageDownloaderConfig *)config {
+    self = [super init];
+    if (self) {
+        if (!config) {
+            config = SDWebImageDownloaderConfig.defaultDownloaderConfig;
+        }
+        _config = [config copy];
+        [_config addObserver:self forKeyPath:NSStringFromSelector(@selector(maxConcurrentDownloads)) options:0 context:SDWebImageDownloaderContext];
+        _downloadQueue = [NSOperationQueue new];
+        _downloadQueue.maxConcurrentOperationCount = _config.maxConcurrentDownloads;
+        _downloadQueue.name = @"com.hackemist.SDWebImageDownloader.downloadQueue";
+        _URLOperations = [NSMutableDictionary new];
+        NSMutableDictionary<NSString *, NSString *> *headerDictionary = [NSMutableDictionary dictionary];
+        NSString *userAgent = nil;
+        // User-Agent Header; see http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.43
+#if SD_VISION
+        userAgent = [NSString stringWithFormat:@"%@/%@ (%@; visionOS %@; Scale/%0.2f)", [[NSBundle mainBundle] infoDictionary][(__bridge NSString *)kCFBundleExecutableKey] ?: [[NSBundle mainBundle] infoDictionary][(__bridge NSString *)kCFBundleIdentifierKey], [[NSBundle mainBundle] infoDictionary][@"CFBundleShortVersionString"] ?: [[NSBundle mainBundle] infoDictionary][(__bridge NSString *)kCFBundleVersionKey], [[UIDevice currentDevice] model], [[UIDevice currentDevice] systemVersion], UITraitCollection.currentTraitCollection.displayScale];
+#elif SD_UIKIT
+        userAgent = [NSString stringWithFormat:@"%@/%@ (%@; iOS %@; Scale/%0.2f)", [[NSBundle mainBundle] infoDictionary][(__bridge NSString *)kCFBundleExecutableKey] ?: [[NSBundle mainBundle] infoDictionary][(__bridge NSString *)kCFBundleIdentifierKey], [[NSBundle mainBundle] infoDictionary][@"CFBundleShortVersionString"] ?: [[NSBundle mainBundle] infoDictionary][(__bridge NSString *)kCFBundleVersionKey], [[UIDevice currentDevice] model], [[UIDevice currentDevice] systemVersion], [[UIScreen mainScreen] scale]];
+#elif SD_WATCH
+        userAgent = [NSString stringWithFormat:@"%@/%@ (%@; watchOS %@; Scale/%0.2f)", [[NSBundle mainBundle] infoDictionary][(__bridge NSString *)kCFBundleExecutableKey] ?: [[NSBundle mainBundle] infoDictionary][(__bridge NSString *)kCFBundleIdentifierKey], [[NSBundle mainBundle] infoDictionary][@"CFBundleShortVersionString"] ?: [[NSBundle mainBundle] infoDictionary][(__bridge NSString *)kCFBundleVersionKey], [[WKInterfaceDevice currentDevice] model], [[WKInterfaceDevice currentDevice] systemVersion], [[WKInterfaceDevice currentDevice] screenScale]];
+#elif SD_MAC
+        userAgent = [NSString stringWithFormat:@"%@/%@ (Mac OS X %@)", [[NSBundle mainBundle] infoDictionary][(__bridge NSString *)kCFBundleExecutableKey] ?: [[NSBundle mainBundle] infoDictionary][(__bridge NSString *)kCFBundleIdentifierKey], [[NSBundle mainBundle] infoDictionary][@"CFBundleShortVersionString"] ?: [[NSBundle mainBundle] infoDictionary][(__bridge NSString *)kCFBundleVersionKey], [[NSProcessInfo processInfo] operatingSystemVersionString]];
+#endif
+        if (userAgent) {
+            if (![userAgent canBeConvertedToEncoding:NSASCIIStringEncoding]) {
+                NSMutableString *mutableUserAgent = [userAgent mutableCopy];
+                if (CFStringTransform((__bridge CFMutableStringRef)(mutableUserAgent), NULL, (__bridge CFStringRef)@"Any-Latin; Latin-ASCII; [:^ASCII:] Remove", false)) {
+                    userAgent = mutableUserAgent;
+                }
+            }
+            headerDictionary[@"User-Agent"] = userAgent;
+        }
+        headerDictionary[@"Accept"] = @"image/*,*/*;q=0.8";
+        _HTTPHeaders = headerDictionary;
+        SD_LOCK_INIT(_HTTPHeadersLock);
+        SD_LOCK_INIT(_operationsLock);
+        NSURLSessionConfiguration *sessionConfiguration = _config.sessionConfiguration;
+        if (!sessionConfiguration) {
+            sessionConfiguration = [NSURLSessionConfiguration defaultSessionConfiguration];
+        }
+        /**
+         *  Create the session for this task
+         *  We send nil as delegate queue so that the session creates a serial operation queue for performing all delegate
+         *  method calls and completion handler calls.
+         */
+        _session = [NSURLSession sessionWithConfiguration:sessionConfiguration
+                                                 delegate:self
+                                            delegateQueue:nil];
+    }
+    return self;
+}
+
+- (void)dealloc {
+    [self.downloadQueue cancelAllOperations];
+    [self.config removeObserver:self forKeyPath:NSStringFromSelector(@selector(maxConcurrentDownloads)) context:SDWebImageDownloaderContext];
+    
+    // Invalide the URLSession after all operations been cancelled
+    [self.session invalidateAndCancel];
+    self.session = nil;
+}
+
+- (void)invalidateSessionAndCancel:(BOOL)cancelPendingOperations {
+    if (self == [SDWebImageDownloader sharedDownloader]) {
+        return;
+    }
+    if (cancelPendingOperations) {
+        [self.session invalidateAndCancel];
+    } else {
+        [self.session finishTasksAndInvalidate];
+    }
+}
+
+- (void)setValue:(nullable NSString *)value forHTTPHeaderField:(nullable NSString *)field {
+    if (!field) {
+        return;
+    }
+    SD_LOCK(_HTTPHeadersLock);
+    [self.HTTPHeaders setValue:value forKey:field];
+    SD_UNLOCK(_HTTPHeadersLock);
+}
+
+- (nullable NSString *)valueForHTTPHeaderField:(nullable NSString *)field {
+    if (!field) {
+        return nil;
+    }
+    SD_LOCK(_HTTPHeadersLock);
+    NSString *value = [self.HTTPHeaders objectForKey:field];
+    SD_UNLOCK(_HTTPHeadersLock);
+    return value;
+}
+
+- (nullable SDWebImageDownloadToken *)downloadImageWithURL:(NSURL *)url
+                                                 completed:(SDWebImageDownloaderCompletedBlock)completedBlock {
+    return [self downloadImageWithURL:url options:0 progress:nil completed:completedBlock];
+}
+
+- (nullable SDWebImageDownloadToken *)downloadImageWithURL:(NSURL *)url
+                                                   options:(SDWebImageDownloaderOptions)options
+                                                  progress:(SDWebImageDownloaderProgressBlock)progressBlock
+                                                 completed:(SDWebImageDownloaderCompletedBlock)completedBlock {
+    return [self downloadImageWithURL:url options:options context:nil progress:progressBlock completed:completedBlock];
+}
+
+- (nullable SDWebImageDownloadToken *)downloadImageWithURL:(nullable NSURL *)url
+                                                   options:(SDWebImageDownloaderOptions)options
+                                                   context:(nullable SDWebImageContext *)context
+                                                  progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                                                 completed:(nullable SDWebImageDownloaderCompletedBlock)completedBlock {
+    // The URL will be used as the key to the callbacks dictionary so it cannot be nil. If it is nil immediately call the completed block with no image or data.
+    if (url == nil) {
+        if (completedBlock) {
+            NSError *error = [NSError errorWithDomain:SDWebImageErrorDomain code:SDWebImageErrorInvalidURL userInfo:@{NSLocalizedDescriptionKey : @"Image url is nil"}];
+            completedBlock(nil, nil, error, YES);
+        }
+        return nil;
+    }
+    
+    id downloadOperationCancelToken;
+    // When different thumbnail size download with same url, we need to make sure each callback called with desired size
+    id<SDWebImageCacheKeyFilter> cacheKeyFilter = context[SDWebImageContextCacheKeyFilter];
+    NSString *cacheKey;
+    if (cacheKeyFilter) {
+        cacheKey = [cacheKeyFilter cacheKeyForURL:url];
+    } else {
+        cacheKey = url.absoluteString;
+    }
+    SDImageCoderOptions *decodeOptions = SDGetDecodeOptionsFromContext(context, [self.class imageOptionsFromDownloaderOptions:options], cacheKey);
+    SD_LOCK(_operationsLock);
+    NSOperation<SDWebImageDownloaderOperation> *operation = [self.URLOperations objectForKey:url];
+    // There is a case that the operation may be marked as finished or cancelled, but not been removed from `self.URLOperations`.
+    BOOL shouldNotReuseOperation;
+    if (operation) {
+        @synchronized (operation) {
+            shouldNotReuseOperation = operation.isFinished || operation.isCancelled;
+        }
+    } else {
+        shouldNotReuseOperation = YES;
+    }
+    if (shouldNotReuseOperation) {
+        operation = [self createDownloaderOperationWithUrl:url options:options context:context];
+        if (!operation) {
+            SD_UNLOCK(_operationsLock);
+            if (completedBlock) {
+                NSError *error = [NSError errorWithDomain:SDWebImageErrorDomain code:SDWebImageErrorInvalidDownloadOperation userInfo:@{NSLocalizedDescriptionKey : @"Downloader operation is nil"}];
+                completedBlock(nil, nil, error, YES);
+            }
+            return nil;
+        }
+        @weakify(self);
+        operation.completionBlock = ^{
+            @strongify(self);
+            if (!self) {
+                return;
+            }
+            SD_LOCK(self->_operationsLock);
+            [self.URLOperations removeObjectForKey:url];
+            SD_UNLOCK(self->_operationsLock);
+        };
+        [self.URLOperations setObject:operation forKey:url];
+        // Add the handlers before submitting to operation queue, avoid the race condition that operation finished before setting handlers.
+        downloadOperationCancelToken = [operation addHandlersForProgress:progressBlock completed:completedBlock decodeOptions:decodeOptions];
+        // Add operation to operation queue only after all configuration done according to Apple's doc.
+        // `addOperation:` does not synchronously execute the `operation.completionBlock` so this will not cause deadlock.
+        [self.downloadQueue addOperation:operation];
+    } else {
+        // When we reuse the download operation to attach more callbacks, there may be thread safe issue because the getter of callbacks may in another queue (decoding queue or delegate queue)
+        // So we lock the operation here, and in `SDWebImageDownloaderOperation`, we use `@synchonzied (self)`, to ensure the thread safe between these two classes.
+        @synchronized (operation) {
+            downloadOperationCancelToken = [operation addHandlersForProgress:progressBlock completed:completedBlock decodeOptions:decodeOptions];
+        }
+    }
+    SD_UNLOCK(_operationsLock);
+    
+    SDWebImageDownloadToken *token = [[SDWebImageDownloadToken alloc] initWithDownloadOperation:operation];
+    token.url = url;
+    token.request = operation.request;
+    token.downloadOperationCancelToken = downloadOperationCancelToken;
+    
+    return token;
+}
+
+#pragma mark Helper methods
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
++ (SDWebImageOptions)imageOptionsFromDownloaderOptions:(SDWebImageDownloaderOptions)downloadOptions {
+    SDWebImageOptions options = 0;
+    if (downloadOptions & SDWebImageDownloaderScaleDownLargeImages) options |= SDWebImageScaleDownLargeImages;
+    if (downloadOptions & SDWebImageDownloaderDecodeFirstFrameOnly) options |= SDWebImageDecodeFirstFrameOnly;
+    if (downloadOptions & SDWebImageDownloaderPreloadAllFrames) options |= SDWebImagePreloadAllFrames;
+    if (downloadOptions & SDWebImageDownloaderAvoidDecodeImage) options |= SDWebImageAvoidDecodeImage;
+    if (downloadOptions & SDWebImageDownloaderMatchAnimatedImageClass) options |= SDWebImageMatchAnimatedImageClass;
+    
+    return options;
+}
+#pragma clang diagnostic pop
+
+- (nullable NSOperation<SDWebImageDownloaderOperation> *)createDownloaderOperationWithUrl:(nonnull NSURL *)url
+                                                                                  options:(SDWebImageDownloaderOptions)options
+                                                                                  context:(nullable SDWebImageContext *)context {
+    NSTimeInterval timeoutInterval = self.config.downloadTimeout;
+    if (timeoutInterval == 0.0) {
+        timeoutInterval = 15.0;
+    }
+    
+    // In order to prevent from potential duplicate caching (NSURLCache + SDImageCache) we disable the cache for image requests if told otherwise
+    NSURLRequestCachePolicy cachePolicy = options & SDWebImageDownloaderUseNSURLCache ? NSURLRequestUseProtocolCachePolicy : NSURLRequestReloadIgnoringLocalCacheData;
+    NSMutableURLRequest *mutableRequest = [[NSMutableURLRequest alloc] initWithURL:url cachePolicy:cachePolicy timeoutInterval:timeoutInterval];
+    mutableRequest.HTTPShouldHandleCookies = SD_OPTIONS_CONTAINS(options, SDWebImageDownloaderHandleCookies);
+    mutableRequest.HTTPShouldUsePipelining = YES;
+    SD_LOCK(_HTTPHeadersLock);
+    mutableRequest.allHTTPHeaderFields = self.HTTPHeaders;
+    SD_UNLOCK(_HTTPHeadersLock);
+    
+    // Context Option
+    SDWebImageMutableContext *mutableContext;
+    if (context) {
+        mutableContext = [context mutableCopy];
+    } else {
+        mutableContext = [NSMutableDictionary dictionary];
+    }
+    
+    // Request Modifier
+    id<SDWebImageDownloaderRequestModifier> requestModifier;
+    if ([context valueForKey:SDWebImageContextDownloadRequestModifier]) {
+        requestModifier = [context valueForKey:SDWebImageContextDownloadRequestModifier];
+    } else {
+        requestModifier = self.requestModifier;
+    }
+    
+    NSURLRequest *request;
+    if (requestModifier) {
+        NSURLRequest *modifiedRequest = [requestModifier modifiedRequestWithRequest:[mutableRequest copy]];
+        // If modified request is nil, early return
+        if (!modifiedRequest) {
+            return nil;
+        } else {
+            request = [modifiedRequest copy];
+        }
+    } else {
+        request = [mutableRequest copy];
+    }
+    // Response Modifier
+    id<SDWebImageDownloaderResponseModifier> responseModifier;
+    if ([context valueForKey:SDWebImageContextDownloadResponseModifier]) {
+        responseModifier = [context valueForKey:SDWebImageContextDownloadResponseModifier];
+    } else {
+        responseModifier = self.responseModifier;
+    }
+    if (responseModifier) {
+        mutableContext[SDWebImageContextDownloadResponseModifier] = responseModifier;
+    }
+    // Decryptor
+    id<SDWebImageDownloaderDecryptor> decryptor;
+    if ([context valueForKey:SDWebImageContextDownloadDecryptor]) {
+        decryptor = [context valueForKey:SDWebImageContextDownloadDecryptor];
+    } else {
+        decryptor = self.decryptor;
+    }
+    if (decryptor) {
+        mutableContext[SDWebImageContextDownloadDecryptor] = decryptor;
+    }
+    
+    context = [mutableContext copy];
+    
+    // Operation Class
+    Class operationClass = self.config.operationClass;
+    if (!operationClass) {
+        operationClass = [SDWebImageDownloaderOperation class];
+    }
+    NSOperation<SDWebImageDownloaderOperation> *operation = [[operationClass alloc] initWithRequest:request inSession:self.session options:options context:context];
+    
+    if ([operation respondsToSelector:@selector(setCredential:)]) {
+        if (self.config.urlCredential) {
+            operation.credential = self.config.urlCredential;
+        } else if (self.config.username && self.config.password) {
+            operation.credential = [NSURLCredential credentialWithUser:self.config.username password:self.config.password persistence:NSURLCredentialPersistenceForSession];
+        }
+    }
+        
+    if ([operation respondsToSelector:@selector(setMinimumProgressInterval:)]) {
+        operation.minimumProgressInterval = MIN(MAX(self.config.minimumProgressInterval, 0), 1);
+    }
+    
+    if ([operation respondsToSelector:@selector(setAcceptableStatusCodes:)]) {
+        operation.acceptableStatusCodes = self.config.acceptableStatusCodes;
+    }
+    
+    if ([operation respondsToSelector:@selector(setAcceptableContentTypes:)]) {
+        operation.acceptableContentTypes = self.config.acceptableContentTypes;
+    }
+    
+    if (options & SDWebImageDownloaderHighPriority) {
+        operation.queuePriority = NSOperationQueuePriorityHigh;
+    } else if (options & SDWebImageDownloaderLowPriority) {
+        operation.queuePriority = NSOperationQueuePriorityLow;
+    }
+    
+    if (self.config.executionOrder == SDWebImageDownloaderLIFOExecutionOrder) {
+        // Emulate LIFO execution order by systematically, each previous adding operation can dependency the new operation
+        // This can gurantee the new operation to be execulated firstly, even if when some operations finished, meanwhile you appending new operations
+        // Just make last added operation dependents new operation can not solve this problem. See test case #test15DownloaderLIFOExecutionOrder
+        for (NSOperation *pendingOperation in self.downloadQueue.operations) {
+            [pendingOperation addDependency:operation];
+        }
+    }
+    
+    return operation;
+}
+
+- (void)cancelAllDownloads {
+    [self.downloadQueue cancelAllOperations];
+}
+
+#pragma mark - Properties
+
+- (BOOL)isSuspended {
+    return self.downloadQueue.isSuspended;
+}
+
+- (void)setSuspended:(BOOL)suspended {
+    self.downloadQueue.suspended = suspended;
+}
+
+- (NSUInteger)currentDownloadCount {
+    return self.downloadQueue.operationCount;
+}
+
+- (NSURLSessionConfiguration *)sessionConfiguration {
+    return self.session.configuration;
+}
+
+#pragma mark - KVO
+
+- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context {
+    if (context == SDWebImageDownloaderContext) {
+        if ([keyPath isEqualToString:NSStringFromSelector(@selector(maxConcurrentDownloads))]) {
+            self.downloadQueue.maxConcurrentOperationCount = self.config.maxConcurrentDownloads;
+        }
+    } else {
+        [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
+    }
+}
+
+#pragma mark Helper methods
+
+- (NSOperation<SDWebImageDownloaderOperation> *)operationWithTask:(NSURLSessionTask *)task {
+    NSOperation<SDWebImageDownloaderOperation> *returnOperation = nil;
+    for (NSOperation<SDWebImageDownloaderOperation> *operation in self.downloadQueue.operations) {
+        if ([operation respondsToSelector:@selector(dataTask)]) {
+            // So we lock the operation here, and in `SDWebImageDownloaderOperation`, we use `@synchonzied (self)`, to ensure the thread safe between these two classes.
+            NSURLSessionTask *operationTask;
+            @synchronized (operation) {
+                operationTask = operation.dataTask;
+            }
+            if (operationTask.taskIdentifier == task.taskIdentifier) {
+                returnOperation = operation;
+                break;
+            }
+        }
+    }
+    return returnOperation;
+}
+
+#pragma mark NSURLSessionDataDelegate
+
+- (void)URLSession:(NSURLSession *)session
+          dataTask:(NSURLSessionDataTask *)dataTask
+didReceiveResponse:(NSURLResponse *)response
+ completionHandler:(void (^)(NSURLSessionResponseDisposition disposition))completionHandler {
+
+    // Identify the operation that runs this task and pass it the delegate method
+    NSOperation<SDWebImageDownloaderOperation> *dataOperation = [self operationWithTask:dataTask];
+    if ([dataOperation respondsToSelector:@selector(URLSession:dataTask:didReceiveResponse:completionHandler:)]) {
+        [dataOperation URLSession:session dataTask:dataTask didReceiveResponse:response completionHandler:completionHandler];
+    } else {
+        if (completionHandler) {
+            completionHandler(NSURLSessionResponseAllow);
+        }
+    }
+}
+
+- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data {
+
+    // Identify the operation that runs this task and pass it the delegate method
+    NSOperation<SDWebImageDownloaderOperation> *dataOperation = [self operationWithTask:dataTask];
+    if ([dataOperation respondsToSelector:@selector(URLSession:dataTask:didReceiveData:)]) {
+        [dataOperation URLSession:session dataTask:dataTask didReceiveData:data];
+    }
+}
+
+- (void)URLSession:(NSURLSession *)session
+          dataTask:(NSURLSessionDataTask *)dataTask
+ willCacheResponse:(NSCachedURLResponse *)proposedResponse
+ completionHandler:(void (^)(NSCachedURLResponse *cachedResponse))completionHandler {
+
+    // Identify the operation that runs this task and pass it the delegate method
+    NSOperation<SDWebImageDownloaderOperation> *dataOperation = [self operationWithTask:dataTask];
+    if ([dataOperation respondsToSelector:@selector(URLSession:dataTask:willCacheResponse:completionHandler:)]) {
+        [dataOperation URLSession:session dataTask:dataTask willCacheResponse:proposedResponse completionHandler:completionHandler];
+    } else {
+        if (completionHandler) {
+            completionHandler(proposedResponse);
+        }
+    }
+}
+
+#pragma mark NSURLSessionTaskDelegate
+
+- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error {
+    
+    // Identify the operation that runs this task and pass it the delegate method
+    NSOperation<SDWebImageDownloaderOperation> *dataOperation = [self operationWithTask:task];
+    if ([dataOperation respondsToSelector:@selector(URLSession:task:didCompleteWithError:)]) {
+        [dataOperation URLSession:session task:task didCompleteWithError:error];
+    }
+}
+
+- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task willPerformHTTPRedirection:(NSHTTPURLResponse *)response newRequest:(NSURLRequest *)request completionHandler:(void (^)(NSURLRequest * _Nullable))completionHandler {
+    
+    // Identify the operation that runs this task and pass it the delegate method
+    NSOperation<SDWebImageDownloaderOperation> *dataOperation = [self operationWithTask:task];
+    if ([dataOperation respondsToSelector:@selector(URLSession:task:willPerformHTTPRedirection:newRequest:completionHandler:)]) {
+        [dataOperation URLSession:session task:task willPerformHTTPRedirection:response newRequest:request completionHandler:completionHandler];
+    } else {
+        if (completionHandler) {
+            completionHandler(request);
+        }
+    }
+}
+
+- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential *credential))completionHandler {
+
+    // Identify the operation that runs this task and pass it the delegate method
+    NSOperation<SDWebImageDownloaderOperation> *dataOperation = [self operationWithTask:task];
+    if ([dataOperation respondsToSelector:@selector(URLSession:task:didReceiveChallenge:completionHandler:)]) {
+        [dataOperation URLSession:session task:task didReceiveChallenge:challenge completionHandler:completionHandler];
+    } else {
+        if (completionHandler) {
+            completionHandler(NSURLSessionAuthChallengePerformDefaultHandling, nil);
+        }
+    }
+}
+
+- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didFinishCollectingMetrics:(NSURLSessionTaskMetrics *)metrics API_AVAILABLE(macos(10.12), ios(10.0), watchos(3.0), tvos(10.0)) {
+    
+    // Identify the operation that runs this task and pass it the delegate method
+    NSOperation<SDWebImageDownloaderOperation> *dataOperation = [self operationWithTask:task];
+    if ([dataOperation respondsToSelector:@selector(URLSession:task:didFinishCollectingMetrics:)]) {
+        [dataOperation URLSession:session task:task didFinishCollectingMetrics:metrics];
+    }
+}
+
+@end
+
+@implementation SDWebImageDownloadToken
+
+- (void)dealloc {
+    [[NSNotificationCenter defaultCenter] removeObserver:self name:SDWebImageDownloadReceiveResponseNotification object:nil];
+    [[NSNotificationCenter defaultCenter] removeObserver:self name:SDWebImageDownloadStopNotification object:nil];
+}
+
+- (instancetype)initWithDownloadOperation:(NSOperation<SDWebImageDownloaderOperation> *)downloadOperation {
+    self = [super init];
+    if (self) {
+        _downloadOperation = downloadOperation;
+        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(downloadDidReceiveResponse:) name:SDWebImageDownloadReceiveResponseNotification object:nil];
+        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(downloadDidStop:) name:SDWebImageDownloadStopNotification object:nil];
+    }
+    return self;
+}
+
+- (void)downloadDidReceiveResponse:(NSNotification *)notification {
+    NSOperation<SDWebImageDownloaderOperation> *downloadOperation = notification.object;
+    if (downloadOperation && downloadOperation == self.downloadOperation) {
+        self.response = downloadOperation.response;
+    }
+}
+
+- (void)downloadDidStop:(NSNotification *)notification {
+    NSOperation<SDWebImageDownloaderOperation> *downloadOperation = notification.object;
+    if (downloadOperation && downloadOperation == self.downloadOperation) {
+        if ([downloadOperation respondsToSelector:@selector(metrics)]) {
+            if (@available(iOS 10.0, tvOS 10.0, macOS 10.12, watchOS 3.0, *)) {
+                self.metrics = downloadOperation.metrics;
+            }
+        }
+    }
+}
+
+- (void)cancel {
+    @synchronized (self) {
+        if (self.isCancelled) {
+            return;
+        }
+        self.cancelled = YES;
+        [self.downloadOperation cancel:self.downloadOperationCancelToken];
+        self.downloadOperationCancelToken = nil;
+    }
+}
+
+@end
+
+@implementation SDWebImageDownloader (SDImageLoader)
+
+- (BOOL)canRequestImageForURL:(NSURL *)url {
+    return [self canRequestImageForURL:url options:0 context:nil];
+}
+
+- (BOOL)canRequestImageForURL:(NSURL *)url options:(SDWebImageOptions)options context:(SDWebImageContext *)context {
+    if (!url) {
+        return NO;
+    }
+    // Always pass YES to let URLSession or custom download operation to determine
+    return YES;
+}
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+- (id<SDWebImageOperation>)requestImageWithURL:(NSURL *)url options:(SDWebImageOptions)options context:(SDWebImageContext *)context progress:(SDImageLoaderProgressBlock)progressBlock completed:(SDImageLoaderCompletedBlock)completedBlock {
+    UIImage *cachedImage = context[SDWebImageContextLoaderCachedImage];
+    
+    SDWebImageDownloaderOptions downloaderOptions = 0;
+    if (options & SDWebImageLowPriority) downloaderOptions |= SDWebImageDownloaderLowPriority;
+    if (options & SDWebImageProgressiveLoad) downloaderOptions |= SDWebImageDownloaderProgressiveLoad;
+    if (options & SDWebImageRefreshCached) downloaderOptions |= SDWebImageDownloaderUseNSURLCache;
+    if (options & SDWebImageContinueInBackground) downloaderOptions |= SDWebImageDownloaderContinueInBackground;
+    if (options & SDWebImageHandleCookies) downloaderOptions |= SDWebImageDownloaderHandleCookies;
+    if (options & SDWebImageAllowInvalidSSLCertificates) downloaderOptions |= SDWebImageDownloaderAllowInvalidSSLCertificates;
+    if (options & SDWebImageHighPriority) downloaderOptions |= SDWebImageDownloaderHighPriority;
+    if (options & SDWebImageScaleDownLargeImages) downloaderOptions |= SDWebImageDownloaderScaleDownLargeImages;
+    if (options & SDWebImageAvoidDecodeImage) downloaderOptions |= SDWebImageDownloaderAvoidDecodeImage;
+    if (options & SDWebImageDecodeFirstFrameOnly) downloaderOptions |= SDWebImageDownloaderDecodeFirstFrameOnly;
+    if (options & SDWebImagePreloadAllFrames) downloaderOptions |= SDWebImageDownloaderPreloadAllFrames;
+    if (options & SDWebImageMatchAnimatedImageClass) downloaderOptions |= SDWebImageDownloaderMatchAnimatedImageClass;
+    
+    if (cachedImage && options & SDWebImageRefreshCached) {
+        // force progressive off if image already cached but forced refreshing
+        downloaderOptions &= ~SDWebImageDownloaderProgressiveLoad;
+        // ignore image read from NSURLCache if image if cached but force refreshing
+        downloaderOptions |= SDWebImageDownloaderIgnoreCachedResponse;
+    }
+    
+    return [self downloadImageWithURL:url options:downloaderOptions context:context progress:progressBlock completed:completedBlock];
+}
+#pragma clang diagnostic pop
+
+- (BOOL)shouldBlockFailedURLWithURL:(NSURL *)url error:(NSError *)error {
+    return [self shouldBlockFailedURLWithURL:url error:error options:0 context:nil];
+}
+
+- (BOOL)shouldBlockFailedURLWithURL:(NSURL *)url error:(NSError *)error options:(SDWebImageOptions)options context:(SDWebImageContext *)context {
+    BOOL shouldBlockFailedURL;
+    // Filter the error domain and check error codes
+    if ([error.domain isEqualToString:SDWebImageErrorDomain]) {
+        shouldBlockFailedURL = (   error.code == SDWebImageErrorInvalidURL
+                                || error.code == SDWebImageErrorBadImageData);
+    } else if ([error.domain isEqualToString:NSURLErrorDomain]) {
+        shouldBlockFailedURL = (   error.code != NSURLErrorNotConnectedToInternet
+                                && error.code != NSURLErrorCancelled
+                                && error.code != NSURLErrorTimedOut
+                                && error.code != NSURLErrorInternationalRoamingOff
+                                && error.code != NSURLErrorDataNotAllowed
+                                && error.code != NSURLErrorCannotFindHost
+                                && error.code != NSURLErrorCannotConnectToHost
+                                && error.code != NSURLErrorNetworkConnectionLost);
+    } else {
+        shouldBlockFailedURL = NO;
+    }
+    return shouldBlockFailedURL;
+}
+
+@end
diff --git a/SDWebImage/Core/SDWebImageDownloaderConfig.h b/SDWebImage/Core/SDWebImageDownloaderConfig.h
new file mode 100644
index 000000000..9d5e67bf7
--- /dev/null
+++ b/SDWebImage/Core/SDWebImageDownloaderConfig.h
@@ -0,0 +1,113 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCompat.h"
+
+/// Operation execution order
+typedef NS_ENUM(NSInteger, SDWebImageDownloaderExecutionOrder) {
+    /**
+     * Default value. All download operations will execute in queue style (first-in-first-out).
+     */
+    SDWebImageDownloaderFIFOExecutionOrder,
+    
+    /**
+     * All download operations will execute in stack style (last-in-first-out).
+     */
+    SDWebImageDownloaderLIFOExecutionOrder
+};
+
+/**
+ The class contains all the config for image downloader
+ @note This class conform to NSCopying, make sure to add the property in `copyWithZone:` as well.
+ */
+@interface SDWebImageDownloaderConfig : NSObject <NSCopying>
+
+/**
+ Gets the default downloader config used for shared instance or initialization when it does not provide any downloader config. Such as `SDWebImageDownloader.sharedDownloader`.
+ @note You can modify the property on default downloader config, which can be used for later created downloader instance. The already created downloader instance does not get affected.
+ */
+@property (nonatomic, class, readonly, nonnull) SDWebImageDownloaderConfig *defaultDownloaderConfig;
+
+/**
+ * The maximum number of concurrent downloads.
+ * Defaults to 6.
+ */
+@property (nonatomic, assign) NSInteger maxConcurrentDownloads;
+
+/**
+ * The timeout value (in seconds) for each download operation.
+ * Defaults to 15.0.
+ */
+@property (nonatomic, assign) NSTimeInterval downloadTimeout;
+
+/**
+ * The minimum interval about progress percent during network downloading. Which means the next progress callback and current progress callback's progress percent difference should be larger or equal to this value. However, the final finish download progress callback does not get effected.
+ * The value should be 0.0-1.0.
+ * @note If you're using progressive decoding feature, this will also effect the image refresh rate.
+ * @note This value may enhance the performance if you don't want progress callback too frequently.
+ * Defaults to 0, which means each time we receive the new data from URLSession, we callback the progressBlock immediately.
+ */
+@property (nonatomic, assign) double minimumProgressInterval;
+
+/**
+ * The custom session configuration in use by NSURLSession. If you don't provide one, we will use `defaultSessionConfiguration` instead.
+ * Defatuls to nil.
+ * @note This property does not support dynamic changes, means it's immutable after the downloader instance initialized.
+ */
+@property (nonatomic, strong, nullable) NSURLSessionConfiguration *sessionConfiguration;
+
+/**
+ * Gets/Sets a subclass of `SDWebImageDownloaderOperation` as the default
+ * `NSOperation` to be used each time SDWebImage constructs a request
+ * operation to download an image.
+ * Defaults to nil.
+ * @note Passing `NSOperation<SDWebImageDownloaderOperation>` to set as default. Passing `nil` will revert to `SDWebImageDownloaderOperation`.
+ */
+@property (nonatomic, assign, nullable) Class operationClass;
+
+/**
+ * Changes download operations execution order.
+ * Defaults to `SDWebImageDownloaderFIFOExecutionOrder`.
+ */
+@property (nonatomic, assign) SDWebImageDownloaderExecutionOrder executionOrder;
+
+/**
+ * Set the default URL credential to be set for request operations.
+ * Defaults to nil.
+ */
+@property (nonatomic, copy, nullable) NSURLCredential *urlCredential;
+
+/**
+ * Set username using for HTTP Basic authentication.
+ * Defaults to nil.
+ */
+@property (nonatomic, copy, nullable) NSString *username;
+
+/**
+ * Set password using for HTTP Basic authentication.
+ * Defaults to nil.
+ */
+@property (nonatomic, copy, nullable) NSString *password;
+
+/**
+ * Set the acceptable HTTP Response status code. The status code which beyond the range will mark the download operation failed.
+ * For example, if we config [200, 400) but server response is 503, the download will fail with error code `SDWebImageErrorInvalidDownloadStatusCode`.
+ * Defaults to [200,400). Nil means no validation at all.
+ */
+@property (nonatomic, copy, nullable) NSIndexSet *acceptableStatusCodes;
+
+/**
+ * Set the acceptable HTTP Response content type. The content type beyond the set will mark the download operation failed.
+ * For example, if we config ["image/png"] but server response is "application/json", the download will fail with error code `SDWebImageErrorInvalidDownloadContentType`.
+ * Normally you don't need this for image format detection because we use image's data file signature magic bytes: https://en.wikipedia.org/wiki/List_of_file_signatures
+ * Defaults to nil. Nil means no validation at all.
+ */
+@property (nonatomic, copy, nullable) NSSet<NSString *> *acceptableContentTypes;
+
+@end
diff --git a/SDWebImage/Core/SDWebImageDownloaderConfig.m b/SDWebImage/Core/SDWebImageDownloaderConfig.m
new file mode 100644
index 000000000..6738b3419
--- /dev/null
+++ b/SDWebImage/Core/SDWebImageDownloaderConfig.m
@@ -0,0 +1,60 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageDownloaderConfig.h"
+#import "SDWebImageDownloaderOperation.h"
+
+static SDWebImageDownloaderConfig * _defaultDownloaderConfig;
+
+@implementation SDWebImageDownloaderConfig
+
++ (SDWebImageDownloaderConfig *)defaultDownloaderConfig {
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        _defaultDownloaderConfig = [SDWebImageDownloaderConfig new];
+    });
+    return _defaultDownloaderConfig;
+}
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        _maxConcurrentDownloads = 6;
+        _downloadTimeout = 15.0;
+        _executionOrder = SDWebImageDownloaderFIFOExecutionOrder;
+        _acceptableStatusCodes = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(200, 100)];
+    }
+    return self;
+}
+
+- (id)copyWithZone:(NSZone *)zone {
+    SDWebImageDownloaderConfig *config = [[[self class] allocWithZone:zone] init];
+    config.maxConcurrentDownloads = self.maxConcurrentDownloads;
+    config.downloadTimeout = self.downloadTimeout;
+    config.minimumProgressInterval = self.minimumProgressInterval;
+    config.sessionConfiguration = [self.sessionConfiguration copyWithZone:zone];
+    config.operationClass = self.operationClass;
+    config.executionOrder = self.executionOrder;
+    config.urlCredential = self.urlCredential;
+    config.username = self.username;
+    config.password = self.password;
+    config.acceptableStatusCodes = self.acceptableStatusCodes;
+    config.acceptableContentTypes = self.acceptableContentTypes;
+    
+    return config;
+}
+
+- (void)setOperationClass:(Class)operationClass {
+    if (operationClass) {
+        NSAssert([operationClass isSubclassOfClass:[NSOperation class]] && [operationClass conformsToProtocol:@protocol(SDWebImageDownloaderOperation)], @"Custom downloader operation class must subclass NSOperation and conform to `SDWebImageDownloaderOperation` protocol");
+    }
+    _operationClass = operationClass;
+}
+
+
+@end
diff --git a/SDWebImage/Core/SDWebImageDownloaderDecryptor.h b/SDWebImage/Core/SDWebImageDownloaderDecryptor.h
new file mode 100644
index 000000000..69eee7a42
--- /dev/null
+++ b/SDWebImage/Core/SDWebImageDownloaderDecryptor.h
@@ -0,0 +1,52 @@
+/*
+* This file is part of the SDWebImage package.
+* (c) Olivier Poitrey <rs@dailymotion.com>
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code.
+*/
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCompat.h"
+
+typedef NSData * _Nullable (^SDWebImageDownloaderDecryptorBlock)(NSData * _Nonnull data, NSURLResponse * _Nullable response);
+
+/**
+This is the protocol for downloader decryptor. Which decrypt the original encrypted data before decoding. Note progressive decoding is not compatible for decryptor.
+We can use a block to specify the downloader decryptor. But Using protocol can make this extensible, and allow Swift user to use it easily instead of using `@convention(block)` to store a block into context options.
+*/
+@protocol SDWebImageDownloaderDecryptor <NSObject>
+
+/// Decrypt the original download data and return a new data. You can use this to decrypt the data using your preferred algorithm.
+/// @param data The original download data
+/// @param response The URL response for data. If you modify the original URL response via response modifier, the modified version will be here. This arg is nullable.
+/// @note If nil is returned, the image download will be marked as failed with error `SDWebImageErrorBadImageData`
+- (nullable NSData *)decryptedDataWithData:(nonnull NSData *)data response:(nullable NSURLResponse *)response;
+
+@end
+
+/**
+A downloader response modifier class with block.
+*/
+@interface SDWebImageDownloaderDecryptor : NSObject <SDWebImageDownloaderDecryptor>
+
+/// Create the data decryptor with block
+/// @param block A block to control decrypt logic
+- (nonnull instancetype)initWithBlock:(nonnull SDWebImageDownloaderDecryptorBlock)block;
+
+/// Create the data decryptor with block
+/// @param block A block to control decrypt logic
++ (nonnull instancetype)decryptorWithBlock:(nonnull SDWebImageDownloaderDecryptorBlock)block;
+
+- (nonnull instancetype)init NS_UNAVAILABLE;
++ (nonnull instancetype)new  NS_UNAVAILABLE;
+
+@end
+
+/// Convenience way to create decryptor for common data encryption.
+@interface SDWebImageDownloaderDecryptor (Conveniences)
+
+/// Base64 Encoded image data decryptor
+@property (class, readonly, nonnull) SDWebImageDownloaderDecryptor *base64Decryptor;
+
+@end
diff --git a/SDWebImage/Core/SDWebImageDownloaderDecryptor.m b/SDWebImage/Core/SDWebImageDownloaderDecryptor.m
new file mode 100644
index 000000000..a3b75b26a
--- /dev/null
+++ b/SDWebImage/Core/SDWebImageDownloaderDecryptor.m
@@ -0,0 +1,55 @@
+/*
+* This file is part of the SDWebImage package.
+* (c) Olivier Poitrey <rs@dailymotion.com>
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code.
+*/
+
+#import "SDWebImageDownloaderDecryptor.h"
+
+@interface SDWebImageDownloaderDecryptor ()
+
+@property (nonatomic, copy, nonnull) SDWebImageDownloaderDecryptorBlock block;
+
+@end
+
+@implementation SDWebImageDownloaderDecryptor
+
+- (instancetype)initWithBlock:(SDWebImageDownloaderDecryptorBlock)block {
+    self = [super init];
+    if (self) {
+        self.block = block;
+    }
+    return self;
+}
+
++ (instancetype)decryptorWithBlock:(SDWebImageDownloaderDecryptorBlock)block {
+    SDWebImageDownloaderDecryptor *decryptor = [[SDWebImageDownloaderDecryptor alloc] initWithBlock:block];
+    return decryptor;
+}
+
+- (nullable NSData *)decryptedDataWithData:(nonnull NSData *)data response:(nullable NSURLResponse *)response {
+    if (!self.block) {
+        return nil;
+    }
+    return self.block(data, response);
+}
+
+@end
+
+@implementation SDWebImageDownloaderDecryptor (Conveniences)
+
++ (SDWebImageDownloaderDecryptor *)base64Decryptor {
+    static SDWebImageDownloaderDecryptor *decryptor;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        decryptor = [SDWebImageDownloaderDecryptor decryptorWithBlock:^NSData * _Nullable(NSData * _Nonnull data, NSURLResponse * _Nullable response) {
+            NSData *modifiedData = [[NSData alloc] initWithBase64EncodedData:data options:NSDataBase64DecodingIgnoreUnknownCharacters];
+            return modifiedData;
+        }];
+    });
+    return decryptor;
+}
+
+@end
diff --git a/SDWebImage/Core/SDWebImageDownloaderOperation.h b/SDWebImage/Core/SDWebImageDownloaderOperation.h
new file mode 100644
index 000000000..aec9c93d7
--- /dev/null
+++ b/SDWebImage/Core/SDWebImageDownloaderOperation.h
@@ -0,0 +1,191 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageDownloader.h"
+#import "SDWebImageOperation.h"
+
+/**
+ Describes a downloader operation. If one wants to use a custom downloader op, it needs to inherit from `NSOperation` and conform to this protocol
+ For the description about these methods, see `SDWebImageDownloaderOperation`
+ @note If your custom operation class does not use `NSURLSession` at all, do not implement the optional methods and session delegate methods.
+ */
+@protocol SDWebImageDownloaderOperation <NSURLSessionTaskDelegate, NSURLSessionDataDelegate>
+@required
+- (nonnull instancetype)initWithRequest:(nullable NSURLRequest *)request
+                              inSession:(nullable NSURLSession *)session
+                                options:(SDWebImageDownloaderOptions)options;
+
+- (nonnull instancetype)initWithRequest:(nullable NSURLRequest *)request
+                              inSession:(nullable NSURLSession *)session
+                                options:(SDWebImageDownloaderOptions)options
+                                context:(nullable SDWebImageContext *)context;
+
+- (nullable id)addHandlersForProgress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                            completed:(nullable SDWebImageDownloaderCompletedBlock)completedBlock;
+
+- (nullable id)addHandlersForProgress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                            completed:(nullable SDWebImageDownloaderCompletedBlock)completedBlock
+                        decodeOptions:(nullable SDImageCoderOptions *)decodeOptions;
+
+- (BOOL)cancel:(nullable id)token;
+
+@property (strong, nonatomic, readonly, nullable) NSURLRequest *request;
+@property (strong, nonatomic, readonly, nullable) NSURLResponse *response;
+
+@optional
+@property (strong, nonatomic, readonly, nullable) NSURLSessionTask *dataTask;
+@property (strong, nonatomic, readonly, nullable) NSURLSessionTaskMetrics *metrics API_AVAILABLE(macos(10.12), ios(10.0), watchos(3.0), tvos(10.0));
+
+// These operation-level config was inherited from downloader. See `SDWebImageDownloaderConfig` for documentation.
+@property (strong, nonatomic, nullable) NSURLCredential *credential;
+@property (assign, nonatomic) double minimumProgressInterval;
+@property (copy, nonatomic, nullable) NSIndexSet *acceptableStatusCodes;
+@property (copy, nonatomic, nullable) NSSet<NSString *> *acceptableContentTypes;
+
+@end
+
+
+/**
+ The download operation class for SDWebImageDownloader.
+ */
+@interface SDWebImageDownloaderOperation : NSOperation <SDWebImageDownloaderOperation>
+
+/**
+ * The request used by the operation's task.
+ */
+@property (strong, nonatomic, readonly, nullable) NSURLRequest *request;
+
+/**
+ * The response returned by the operation's task.
+ */
+@property (strong, nonatomic, readonly, nullable) NSURLResponse *response;
+
+/**
+ * The operation's task
+ */
+@property (strong, nonatomic, readonly, nullable) NSURLSessionTask *dataTask;
+
+/**
+ * The collected metrics from `-URLSession:task:didFinishCollectingMetrics:`.
+ * This can be used to collect the network metrics like download duration, DNS lookup duration, SSL handshake duration, etc. See Apple's documentation: https://developer.apple.com/documentation/foundation/urlsessiontaskmetrics
+ */
+@property (strong, nonatomic, readonly, nullable) NSURLSessionTaskMetrics *metrics API_AVAILABLE(macos(10.12), ios(10.0), watchos(3.0), tvos(10.0));
+
+/**
+ * The credential used for authentication challenges in `-URLSession:task:didReceiveChallenge:completionHandler:`.
+ *
+ * This will be overridden by any shared credentials that exist for the username or password of the request URL, if present.
+ */
+@property (strong, nonatomic, nullable) NSURLCredential *credential;
+
+/**
+ * The minimum interval about progress percent during network downloading. Which means the next progress callback and current progress callback's progress percent difference should be larger or equal to this value. However, the final finish download progress callback does not get effected.
+ * The value should be 0.0-1.0.
+ * @note If you're using progressive decoding feature, this will also effect the image refresh rate.
+ * @note This value may enhance the performance if you don't want progress callback too frequently.
+ * Defaults to 0, which means each time we receive the new data from URLSession, we callback the progressBlock immediately.
+ */
+@property (assign, nonatomic) double minimumProgressInterval;
+
+/**
+ * Set the acceptable HTTP Response status code. The status code which beyond the range will mark the download operation failed.
+ * For example, if we config [200, 400) but server response is 503, the download will fail with error code `SDWebImageErrorInvalidDownloadStatusCode`.
+ * Defaults to [200,400). Nil means no validation at all.
+ */
+@property (copy, nonatomic, nullable) NSIndexSet *acceptableStatusCodes;
+
+/**
+ * Set the acceptable HTTP Response content type. The content type beyond the set will mark the download operation failed.
+ * For example, if we config ["image/png"] but server response is "application/json", the download will fail with error code `SDWebImageErrorInvalidDownloadContentType`.
+ * Normally you don't need this for image format detection because we use image's data file signature magic bytes: https://en.wikipedia.org/wiki/List_of_file_signatures
+ * Defaults to nil. Nil means no validation at all.
+ */
+@property (copy, nonatomic, nullable) NSSet<NSString *> *acceptableContentTypes;
+
+/**
+ * The options for the receiver.
+ */
+@property (assign, nonatomic, readonly) SDWebImageDownloaderOptions options;
+
+/**
+ * The context for the receiver.
+ */
+@property (copy, nonatomic, readonly, nullable) SDWebImageContext *context;
+
+/**
+ *  Initializes a `SDWebImageDownloaderOperation` object
+ *
+ *  @see SDWebImageDownloaderOperation
+ *
+ *  @param request        the URL request
+ *  @param session        the URL session in which this operation will run
+ *  @param options        downloader options
+ *
+ *  @return the initialized instance
+ */
+- (nonnull instancetype)initWithRequest:(nullable NSURLRequest *)request
+                              inSession:(nullable NSURLSession *)session
+                                options:(SDWebImageDownloaderOptions)options;
+
+/**
+ *  Initializes a `SDWebImageDownloaderOperation` object
+ *
+ *  @see SDWebImageDownloaderOperation
+ *
+ *  @param request        the URL request
+ *  @param session        the URL session in which this operation will run
+ *  @param options        downloader options
+ *  @param context        A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
+ *
+ *  @return the initialized instance
+ */
+- (nonnull instancetype)initWithRequest:(nullable NSURLRequest *)request
+                              inSession:(nullable NSURLSession *)session
+                                options:(SDWebImageDownloaderOptions)options
+                                context:(nullable SDWebImageContext *)context NS_DESIGNATED_INITIALIZER;
+
+/**
+ *  Adds handlers for progress and completion. Returns a token that can be passed to -cancel: to cancel this set of
+ *  callbacks.
+ *
+ *  @param progressBlock  the block executed when a new chunk of data arrives.
+ *                        @note the progress block is executed on a background queue
+ *  @param completedBlock the block executed when the download is done.
+ *                        @note the completed block is executed on the main queue for success. If errors are found, there is a chance the block will be executed on a background queue
+ *
+ *  @return the token to use to cancel this set of handlers
+ */
+- (nullable id)addHandlersForProgress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                            completed:(nullable SDWebImageDownloaderCompletedBlock)completedBlock;
+
+/**
+ *  Adds handlers for progress and completion, and optional decode options (which need another image other than the initial one). Returns a token that can be passed to -cancel: to cancel this set of
+ *  callbacks.
+ *
+ *  @param progressBlock  the block executed when a new chunk of data arrives.
+ *                        @note the progress block is executed on a background queue
+ *  @param completedBlock the block executed when the download is done.
+ *                        @note the completed block is executed on the main queue for success. If errors are found, there is a chance the block will be executed on a background queue
+ *  @param decodeOptions The optional decode options, used when in thumbnail decoding for current completion block callback. For example, request <url1, {thumbnail: 100x100}> and then <url1, {thumbnail: 200x200}>, we may callback these two completion block with different size.
+ *  @return the token to use to cancel this set of handlers
+ */
+- (nullable id)addHandlersForProgress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                            completed:(nullable SDWebImageDownloaderCompletedBlock)completedBlock
+                        decodeOptions:(nullable SDImageCoderOptions *)decodeOptions;
+
+/**
+ *  Cancels a set of callbacks. Once all callbacks are canceled, the operation is cancelled.
+ *
+ *  @param token the token representing a set of callbacks to cancel
+ *
+ *  @return YES if the operation was stopped because this was the last token to be canceled. NO otherwise.
+ */
+- (BOOL)cancel:(nullable id)token;
+
+@end
diff --git a/SDWebImage/Core/SDWebImageDownloaderOperation.m b/SDWebImage/Core/SDWebImageDownloaderOperation.m
new file mode 100644
index 000000000..4bd577981
--- /dev/null
+++ b/SDWebImage/Core/SDWebImageDownloaderOperation.m
@@ -0,0 +1,762 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageDownloaderOperation.h"
+#import "SDWebImageError.h"
+#import "SDInternalMacros.h"
+#import "SDWebImageDownloaderResponseModifier.h"
+#import "SDWebImageDownloaderDecryptor.h"
+#import "SDImageCacheDefine.h"
+#import "SDCallbackQueue.h"
+
+// A handler to represent individual request
+@interface SDWebImageDownloaderOperationToken : NSObject
+
+@property (nonatomic, copy, nullable) SDWebImageDownloaderCompletedBlock completedBlock;
+@property (nonatomic, copy, nullable) SDWebImageDownloaderProgressBlock progressBlock;
+@property (nonatomic, copy, nullable) SDImageCoderOptions *decodeOptions;
+
+@end
+
+@implementation SDWebImageDownloaderOperationToken
+
+- (BOOL)isEqual:(id)other {
+    if (nil == other) {
+      return NO;
+    }
+    if (self == other) {
+      return YES;
+    }
+    if (![other isKindOfClass:[self class]]) {
+      return NO;
+    }
+    SDWebImageDownloaderOperationToken *object = (SDWebImageDownloaderOperationToken *)other;
+    // warn: only compare decodeOptions, ignore pointer, use `removeObjectIdenticalTo`
+    BOOL result = [self.decodeOptions isEqualToDictionary:object.decodeOptions];
+    return result;
+}
+
+@end
+
+@interface SDWebImageDownloaderOperation ()
+
+@property (strong, nonatomic, nonnull) NSMutableArray<SDWebImageDownloaderOperationToken *> *callbackTokens;
+
+@property (assign, nonatomic, readwrite) SDWebImageDownloaderOptions options;
+@property (copy, nonatomic, readwrite, nullable) SDWebImageContext *context;
+
+@property (assign, nonatomic, getter = isExecuting) BOOL executing;
+@property (assign, nonatomic, getter = isFinished) BOOL finished;
+@property (strong, nonatomic, nullable) NSMutableData *imageData;
+@property (copy, nonatomic, nullable) NSData *cachedData; // for `SDWebImageDownloaderIgnoreCachedResponse`
+@property (assign, nonatomic) NSUInteger expectedSize; // may be 0
+@property (assign, nonatomic) NSUInteger receivedSize;
+@property (strong, nonatomic, nullable, readwrite) NSURLResponse *response;
+@property (strong, nonatomic, nullable) NSError *responseError;
+@property (assign, nonatomic) double previousProgress; // previous progress percent
+
+@property (assign, nonatomic, getter = isDownloadCompleted) BOOL downloadCompleted;
+
+@property (strong, nonatomic, nullable) id<SDWebImageDownloaderResponseModifier> responseModifier; // modify original URLResponse
+@property (strong, nonatomic, nullable) id<SDWebImageDownloaderDecryptor> decryptor; // decrypt image data
+
+// This is weak because it is injected by whoever manages this session. If this gets nil-ed out, we won't be able to run
+// the task associated with this operation
+@property (weak, nonatomic, nullable) NSURLSession *unownedSession;
+// This is set if we're using not using an injected NSURLSession. We're responsible of invalidating this one
+@property (strong, nonatomic, nullable) NSURLSession *ownedSession;
+
+@property (strong, nonatomic, readwrite, nullable) NSURLSessionTask *dataTask;
+
+@property (strong, nonatomic, readwrite, nullable) NSURLSessionTaskMetrics *metrics API_AVAILABLE(macos(10.12), ios(10.0), watchos(3.0), tvos(10.0));
+
+@property (strong, nonatomic, nonnull) NSOperationQueue *coderQueue; // the serial operation queue to do image decoding
+
+@property (strong, nonatomic, nonnull) NSMapTable<SDImageCoderOptions *, UIImage *> *imageMap; // each variant of image is weak-referenced to avoid too many re-decode during downloading
+#if SD_UIKIT
+@property (assign, nonatomic) UIBackgroundTaskIdentifier backgroundTaskId;
+#endif
+
+@end
+
+@implementation SDWebImageDownloaderOperation
+
+@synthesize executing = _executing;
+@synthesize finished = _finished;
+
+- (nonnull instancetype)init {
+    return [self initWithRequest:nil inSession:nil options:0];
+}
+
+- (instancetype)initWithRequest:(NSURLRequest *)request inSession:(NSURLSession *)session options:(SDWebImageDownloaderOptions)options {
+    return [self initWithRequest:request inSession:session options:options context:nil];
+}
+
+- (nonnull instancetype)initWithRequest:(nullable NSURLRequest *)request
+                              inSession:(nullable NSURLSession *)session
+                                options:(SDWebImageDownloaderOptions)options
+                                context:(nullable SDWebImageContext *)context {
+    if ((self = [super init])) {
+        _request = [request copy];
+        _options = options;
+        _context = [context copy];
+        _callbackTokens = [NSMutableArray new];
+        _responseModifier = context[SDWebImageContextDownloadResponseModifier];
+        _decryptor = context[SDWebImageContextDownloadDecryptor];
+        _executing = NO;
+        _finished = NO;
+        _expectedSize = 0;
+        _unownedSession = session;
+        _downloadCompleted = NO;
+        _coderQueue = [[NSOperationQueue alloc] init];
+        _coderQueue.maxConcurrentOperationCount = 1;
+        _coderQueue.name = @"com.hackemist.SDWebImageDownloaderOperation.coderQueue";
+        _imageMap = [[NSMapTable alloc] initWithKeyOptions:NSPointerFunctionsStrongMemory valueOptions:NSPointerFunctionsWeakMemory capacity:1];
+#if SD_UIKIT
+        _backgroundTaskId = UIBackgroundTaskInvalid;
+#endif
+    }
+    return self;
+}
+
+- (nullable id)addHandlersForProgress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                            completed:(nullable SDWebImageDownloaderCompletedBlock)completedBlock {
+    return [self addHandlersForProgress:progressBlock completed:completedBlock decodeOptions:nil];
+}
+
+- (nullable id)addHandlersForProgress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                            completed:(nullable SDWebImageDownloaderCompletedBlock)completedBlock
+                        decodeOptions:(nullable SDImageCoderOptions *)decodeOptions {
+    if (!completedBlock && !progressBlock && !decodeOptions) return nil;
+    SDWebImageDownloaderOperationToken *token = [SDWebImageDownloaderOperationToken new];
+    token.completedBlock = completedBlock;
+    token.progressBlock = progressBlock;
+    token.decodeOptions = decodeOptions;
+    @synchronized (self) {
+        [self.callbackTokens addObject:token];
+    }
+    
+    return token;
+}
+
+- (BOOL)cancel:(nullable id)token {
+    if (![token isKindOfClass:SDWebImageDownloaderOperationToken.class]) return NO;
+    
+    BOOL shouldCancel = NO;
+    @synchronized (self) {
+        NSArray *tokens = self.callbackTokens;
+        if (tokens.count == 1 && [tokens indexOfObjectIdenticalTo:token] != NSNotFound) {
+            shouldCancel = YES;
+        }
+    }
+    if (shouldCancel) {
+        // Cancel operation running and callback last token's completion block
+        [self cancel];
+    } else {
+        // Only callback this token's completion block
+        @synchronized (self) {
+            [self.callbackTokens removeObjectIdenticalTo:token];
+        }
+        [self callCompletionBlockWithToken:token image:nil imageData:nil error:[NSError errorWithDomain:SDWebImageErrorDomain code:SDWebImageErrorCancelled userInfo:@{NSLocalizedDescriptionKey : @"Operation cancelled by user during sending the request"}] finished:YES];
+    }
+    return shouldCancel;
+}
+
+- (void)start {
+    NSURLSessionTask *dataTask = nil;
+    @synchronized (self) {
+        if (self.isCancelled) {
+            if (!self.isFinished) self.finished = YES;
+            // Operation cancelled by user before sending the request
+            [self callCompletionBlocksWithError:[NSError errorWithDomain:SDWebImageErrorDomain code:SDWebImageErrorCancelled userInfo:@{NSLocalizedDescriptionKey : @"Operation cancelled by user before sending the request"}]];
+            [self reset];
+            return;
+        }
+
+#if SD_UIKIT
+        Class UIApplicationClass = NSClassFromString(@"UIApplication");
+        BOOL hasApplication = UIApplicationClass && [UIApplicationClass respondsToSelector:@selector(sharedApplication)];
+        if (hasApplication && [self shouldContinueWhenAppEntersBackground]) {
+            __weak typeof(self) wself = self;
+            UIApplication * app = [UIApplicationClass performSelector:@selector(sharedApplication)];
+            self.backgroundTaskId = [app beginBackgroundTaskWithExpirationHandler:^{
+                [wself cancel];
+            }];
+        }
+#endif
+        NSURLSession *session = self.unownedSession;
+        if (!session) {
+            NSURLSessionConfiguration *sessionConfig = [NSURLSessionConfiguration defaultSessionConfiguration];
+            sessionConfig.timeoutIntervalForRequest = 15;
+            
+            /**
+             *  Create the session for this task
+             *  We send nil as delegate queue so that the session creates a serial operation queue for performing all delegate
+             *  method calls and completion handler calls.
+             */
+            session = [NSURLSession sessionWithConfiguration:sessionConfig
+                                                    delegate:self
+                                               delegateQueue:nil];
+            self.ownedSession = session;
+        }
+        
+        if (self.options & SDWebImageDownloaderIgnoreCachedResponse) {
+            // Grab the cached data for later check
+            NSURLCache *URLCache = session.configuration.URLCache;
+            if (!URLCache) {
+                URLCache = [NSURLCache sharedURLCache];
+            }
+            NSCachedURLResponse *cachedResponse;
+            // NSURLCache's `cachedResponseForRequest:` is not thread-safe, see https://developer.apple.com/documentation/foundation/nsurlcache#2317483
+            @synchronized (URLCache) {
+                cachedResponse = [URLCache cachedResponseForRequest:self.request];
+            }
+            if (cachedResponse) {
+                self.cachedData = cachedResponse.data;
+                self.response = cachedResponse.response;
+            }
+        }
+        
+        if (!session.delegate) {
+            // Session been invalid and has no delegate at all
+            [self callCompletionBlocksWithError:[NSError errorWithDomain:SDWebImageErrorDomain code:SDWebImageErrorInvalidDownloadOperation userInfo:@{NSLocalizedDescriptionKey : @"Session delegate is nil and invalid"}]];
+            [self reset];
+            return;
+        }
+        
+        dataTask = [session dataTaskWithRequest:self.request];
+    }
+
+    if (dataTask) {
+        if (self.options & SDWebImageDownloaderHighPriority) {
+            dataTask.priority = NSURLSessionTaskPriorityHigh;
+        } else if (self.options & SDWebImageDownloaderLowPriority) {
+            dataTask.priority = NSURLSessionTaskPriorityLow;
+        } else {
+            dataTask.priority = NSURLSessionTaskPriorityDefault;
+        }
+        NSArray<SDWebImageDownloaderOperationToken *> *tokens;
+        @synchronized (self) {
+            tokens = [self.callbackTokens copy];
+            self.dataTask = dataTask;
+            self.executing = YES;
+            [self.dataTask resume];
+        }
+        for (SDWebImageDownloaderOperationToken *token in tokens) {
+            if (token.progressBlock) {
+                token.progressBlock(0, NSURLResponseUnknownLength, self.request.URL);
+            }
+        }
+        __block typeof(self) strongSelf = self;
+        dispatch_async(dispatch_get_main_queue(), ^{
+            [[NSNotificationCenter defaultCenter] postNotificationName:SDWebImageDownloadStartNotification object:strongSelf];
+        });
+    } else {
+        if (!self.isFinished) self.finished = YES;
+        [self callCompletionBlocksWithError:[NSError errorWithDomain:SDWebImageErrorDomain code:SDWebImageErrorInvalidDownloadOperation userInfo:@{NSLocalizedDescriptionKey : @"Task can't be initialized"}]];
+        [self reset];
+    }
+}
+
+- (void)cancel {
+    @synchronized (self) {
+        [self cancelInternal];
+    }
+}
+
+- (void)cancelInternal {
+    if (self.isFinished) return;
+    [super cancel];
+    
+    __block typeof(self) strongSelf = self;
+    dispatch_async(dispatch_get_main_queue(), ^{
+        [[NSNotificationCenter defaultCenter] postNotificationName:SDWebImageDownloadStopNotification object:strongSelf];
+    });
+
+    if (self.dataTask) {
+        // Cancel the URLSession, `URLSession:task:didCompleteWithError:` delegate callback will be ignored
+        [self.dataTask cancel];
+        self.dataTask = nil;
+    }
+    
+    // NSOperation disallow setFinished=YES **before** operation's start method been called
+    // We check for the initialized status, which is isExecuting == NO && isFinished = NO
+    // Ony update for non-intialized status, which is !(isExecuting == NO && isFinished = NO), or if (self.isExecuting || self.isFinished) {...}
+    if (self.isExecuting || self.isFinished) {
+        if (self.isExecuting) self.executing = NO;
+        if (!self.isFinished) self.finished = YES;
+    }
+    
+    // Operation cancelled by user during sending the request
+    [self callCompletionBlocksWithError:[NSError errorWithDomain:SDWebImageErrorDomain code:SDWebImageErrorCancelled userInfo:@{NSLocalizedDescriptionKey : @"Operation cancelled by user during sending the request"}]];
+
+    [self reset];
+}
+
+- (void)done {
+    self.finished = YES;
+    self.executing = NO;
+    [self reset];
+}
+
+- (void)reset {
+    @synchronized (self) {
+        [self.callbackTokens removeAllObjects];
+        self.dataTask = nil;
+        
+        if (self.ownedSession) {
+            [self.ownedSession invalidateAndCancel];
+            self.ownedSession = nil;
+        }
+        
+#if SD_UIKIT
+        if (self.backgroundTaskId != UIBackgroundTaskInvalid) {
+            // If backgroundTaskId != UIBackgroundTaskInvalid, sharedApplication is always exist
+            UIApplication * app = [UIApplication performSelector:@selector(sharedApplication)];
+            [app endBackgroundTask:self.backgroundTaskId];
+            self.backgroundTaskId = UIBackgroundTaskInvalid;
+        }
+#endif
+    }
+}
+
+- (void)setFinished:(BOOL)finished {
+    [self willChangeValueForKey:@"isFinished"];
+    _finished = finished;
+    [self didChangeValueForKey:@"isFinished"];
+}
+
+- (void)setExecuting:(BOOL)executing {
+    [self willChangeValueForKey:@"isExecuting"];
+    _executing = executing;
+    [self didChangeValueForKey:@"isExecuting"];
+}
+
+- (BOOL)isAsynchronous {
+    return YES;
+}
+
+// Check for unprocessed tokens.
+// if all tokens have been processed call [self done].
+- (void)checkDoneWithImageData:(NSData *)imageData
+                finishedTokens:(NSArray<SDWebImageDownloaderOperationToken *> *)finishedTokens {
+    @synchronized (self) {
+        NSMutableArray<SDWebImageDownloaderOperationToken *> *tokens = [self.callbackTokens mutableCopy];
+        [finishedTokens enumerateObjectsUsingBlock:^(SDWebImageDownloaderOperationToken * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
+            [tokens removeObjectIdenticalTo:obj];
+        }];
+        if (tokens.count == 0) {
+            [self done];
+        } else {
+            // If there are new tokens added during the decoding operation, the decoding operation is supplemented with these new tokens.
+            [self startCoderOperationWithImageData:imageData pendingTokens:tokens finishedTokens:finishedTokens];
+        }
+    }
+}
+
+- (void)startCoderOperationWithImageData:(NSData *)imageData
+                           pendingTokens:(NSArray<SDWebImageDownloaderOperationToken *> *)pendingTokens
+                          finishedTokens:(NSArray<SDWebImageDownloaderOperationToken *> *)finishedTokens {
+    @weakify(self);
+    for (SDWebImageDownloaderOperationToken *token in pendingTokens) {
+        [self.coderQueue addOperationWithBlock:^{
+            @strongify(self);
+            if (!self) {
+                return;
+            }
+            UIImage *image;
+            // check if we already decode this variant of image for current callback
+            if (token.decodeOptions) {
+                image = [self.imageMap objectForKey:token.decodeOptions];
+            }
+            if (!image) {
+                // check if we already use progressive decoding, use that to produce faster decoding
+                id<SDProgressiveImageCoder> progressiveCoder = SDImageLoaderGetProgressiveCoder(self);
+                SDWebImageOptions options = [[self class] imageOptionsFromDownloaderOptions:self.options];
+                SDWebImageContext *context;
+                if (token.decodeOptions) {
+                    SDWebImageMutableContext *mutableContext = [NSMutableDictionary dictionaryWithDictionary:self.context];
+                    SDSetDecodeOptionsToContext(mutableContext, &options, token.decodeOptions);
+                    context = [mutableContext copy];
+                } else {
+                    context = self.context;
+                }
+                if (progressiveCoder) {
+                    image = SDImageLoaderDecodeProgressiveImageData(imageData, self.request.URL, YES, self, options, context);
+                } else {
+                    image = SDImageLoaderDecodeImageData(imageData, self.request.URL, options, context);
+                }
+                if (image && token.decodeOptions) {
+                    [self.imageMap setObject:image forKey:token.decodeOptions];
+                }
+            }
+            CGSize imageSize = image.size;
+            if (imageSize.width == 0 || imageSize.height == 0) {
+                NSString *description = image == nil ? @"Downloaded image decode failed" : @"Downloaded image has 0 pixels";
+                NSError *error = [NSError errorWithDomain:SDWebImageErrorDomain code:SDWebImageErrorBadImageData userInfo:@{NSLocalizedDescriptionKey : description}];
+                [self callCompletionBlockWithToken:token image:nil imageData:nil error:error finished:YES];
+            } else {
+                [self callCompletionBlockWithToken:token image:image imageData:imageData error:nil finished:YES];
+            }
+        }];
+    }
+    // call [self done] after all completed block was dispatched
+    dispatch_block_t doneBlock = ^{
+        @strongify(self);
+        if (!self) {
+            return;
+        }
+        // Check for new tokens added during the decode operation.
+        [self checkDoneWithImageData:imageData
+                      finishedTokens:[finishedTokens arrayByAddingObjectsFromArray:pendingTokens]];
+    };
+    if (@available(iOS 13, tvOS 13, macOS 10.15, watchOS 6, *)) {
+        // seems faster than `addOperationWithBlock`
+        [self.coderQueue addBarrierBlock:doneBlock];
+    } else {
+        // serial queue, this does the same effect in semantics
+        [self.coderQueue addOperationWithBlock:doneBlock];
+    }
+
+}
+
+#pragma mark NSURLSessionDataDelegate
+
+- (void)URLSession:(NSURLSession *)session
+          dataTask:(NSURLSessionDataTask *)dataTask
+didReceiveResponse:(NSURLResponse *)response
+ completionHandler:(void (^)(NSURLSessionResponseDisposition disposition))completionHandler {
+    NSURLSessionResponseDisposition disposition = NSURLSessionResponseAllow;
+    
+    // Check response modifier, if return nil, will marked as cancelled.
+    BOOL valid = YES;
+    if (self.responseModifier && response) {
+        response = [self.responseModifier modifiedResponseWithResponse:response];
+        if (!response) {
+            valid = NO;
+            self.responseError = [NSError errorWithDomain:SDWebImageErrorDomain
+                                                     code:SDWebImageErrorInvalidDownloadResponse
+                                                 userInfo:@{NSLocalizedDescriptionKey : @"Download marked as failed because response is nil"}];
+        }
+    }
+    
+    NSInteger expected = (NSInteger)response.expectedContentLength;
+    expected = expected > 0 ? expected : 0;
+    self.expectedSize = expected;
+    self.response = response;
+    
+    // Check status code valid (defaults [200,400))
+    NSInteger statusCode = [response isKindOfClass:NSHTTPURLResponse.class] ? ((NSHTTPURLResponse *)response).statusCode : 0;
+    BOOL statusCodeValid = YES;
+    if (valid && statusCode > 0 && self.acceptableStatusCodes) {
+        statusCodeValid = [self.acceptableStatusCodes containsIndex:statusCode];
+    }
+    if (!statusCodeValid) {
+        valid = NO;
+        self.responseError = [NSError errorWithDomain:SDWebImageErrorDomain
+                                                 code:SDWebImageErrorInvalidDownloadStatusCode
+                                             userInfo:@{NSLocalizedDescriptionKey : [NSString stringWithFormat:@"Download marked as failed because of invalid response status code %ld", (long)statusCode],
+                                                        SDWebImageErrorDownloadStatusCodeKey : @(statusCode),
+                                                        SDWebImageErrorDownloadResponseKey : response}];
+    }
+    // Check content type valid (defaults nil)
+    NSString *contentType = [response isKindOfClass:NSHTTPURLResponse.class] ? ((NSHTTPURLResponse *)response).MIMEType : nil;
+    BOOL contentTypeValid = YES;
+    if (valid && contentType.length > 0 && self.acceptableContentTypes) {
+        contentTypeValid = [self.acceptableContentTypes containsObject:contentType];
+    }
+    if (!contentTypeValid) {
+        valid = NO;
+        self.responseError = [NSError errorWithDomain:SDWebImageErrorDomain
+                                                 code:SDWebImageErrorInvalidDownloadContentType
+                                             userInfo:@{NSLocalizedDescriptionKey : [NSString stringWithFormat:@"Download marked as failed because of invalid response content type %@", contentType],
+                                                        SDWebImageErrorDownloadContentTypeKey : contentType,
+                                                        SDWebImageErrorDownloadResponseKey : response}];
+    }
+    //'304 Not Modified' is an exceptional one
+    //URLSession current behavior will return 200 status code when the server respond 304 and URLCache hit. But this is not a standard behavior and we just add a check
+    if (valid && statusCode == 304 && !self.cachedData) {
+        valid = NO;
+        self.responseError = [NSError errorWithDomain:SDWebImageErrorDomain
+                                                 code:SDWebImageErrorCacheNotModified
+                                             userInfo:@{NSLocalizedDescriptionKey: @"Download response status code is 304 not modified and ignored",
+                                                        SDWebImageErrorDownloadResponseKey : response}];
+    }
+    
+    if (valid) {
+        NSArray<SDWebImageDownloaderOperationToken *> *tokens;
+        @synchronized (self) {
+            tokens = [self.callbackTokens copy];
+        }
+        for (SDWebImageDownloaderOperationToken *token in tokens) {
+            if (token.progressBlock) {
+                token.progressBlock(0, expected, self.request.URL);
+            }
+        }
+    } else {
+        // Status code invalid and marked as cancelled. Do not call `[self.dataTask cancel]` which may mass up URLSession life cycle
+        disposition = NSURLSessionResponseCancel;
+    }
+    __block typeof(self) strongSelf = self;
+    dispatch_async(dispatch_get_main_queue(), ^{
+        [[NSNotificationCenter defaultCenter] postNotificationName:SDWebImageDownloadReceiveResponseNotification object:strongSelf];
+    });
+    
+    if (completionHandler) {
+        completionHandler(disposition);
+    }
+}
+
+- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data {
+    if (!self.imageData) {
+        self.imageData = [[NSMutableData alloc] initWithCapacity:self.expectedSize];
+    }
+    [self.imageData appendData:data];
+    
+    self.receivedSize = self.imageData.length;
+    NSArray<SDWebImageDownloaderOperationToken *> *tokens;
+    @synchronized (self) {
+        tokens = [self.callbackTokens copy];
+    }
+    if (self.expectedSize == 0) {
+        // Unknown expectedSize, immediately call progressBlock and return
+        for (SDWebImageDownloaderOperationToken *token in tokens) {
+            if (token.progressBlock) {
+                token.progressBlock(self.receivedSize, self.expectedSize, self.request.URL);
+            }
+        }
+        return;
+    }
+    
+    // Get the finish status
+    BOOL finished = (self.receivedSize >= self.expectedSize);
+    // Get the current progress
+    double currentProgress = (double)self.receivedSize / (double)self.expectedSize;
+    double previousProgress = self.previousProgress;
+    double progressInterval = currentProgress - previousProgress;
+    // Check if we need callback progress
+    if (!finished && (progressInterval < self.minimumProgressInterval)) {
+        return;
+    }
+    self.previousProgress = currentProgress;
+    
+    // Using data decryptor will disable the progressive decoding, since there are no support for progressive decrypt
+    BOOL supportProgressive = (self.options & SDWebImageDownloaderProgressiveLoad) && !self.decryptor;
+    // When multiple thumbnail decoding use different size, this progressive decoding will cause issue because each callback assume called with different size's image, can not share the same decoding part
+    // We currently only pick the first thumbnail size, see #3423 talks
+    // Progressive decoding Only decode partial image, full image in `URLSession:task:didCompleteWithError:`
+    if (supportProgressive && !finished) {
+        // Get the image data
+        NSData *imageData = self.imageData;
+        
+        // keep maximum one progressive decode process during download
+        if (imageData && self.coderQueue.operationCount == 0) {
+            // NSOperation have autoreleasepool, don't need to create extra one
+            @weakify(self);
+            [self.coderQueue addOperationWithBlock:^{
+                @strongify(self);
+                if (!self) {
+                    return;
+                }
+                // When cancelled or transfer finished (`didCompleteWithError`), cancel the progress callback, only completed block is called and enough
+                @synchronized (self) {
+                    if (self.isCancelled || self.isDownloadCompleted) {
+                        return;
+                    }
+                }
+                UIImage *image = SDImageLoaderDecodeProgressiveImageData(imageData, self.request.URL, NO, self, [[self class] imageOptionsFromDownloaderOptions:self.options], self.context);
+                if (image) {
+                    // We do not keep the progressive decoding image even when `finished`=YES. Because they are for view rendering but not take full function from downloader options. And some coders implementation may not keep consistent between progressive decoding and normal decoding.
+                    
+                    [self callCompletionBlocksWithImage:image imageData:nil error:nil finished:NO];
+                }
+            }];
+        }
+    }
+    
+    for (SDWebImageDownloaderOperationToken *token in tokens) {
+        if (token.progressBlock) {
+            token.progressBlock(self.receivedSize, self.expectedSize, self.request.URL);
+        }
+    }
+}
+
+- (void)URLSession:(NSURLSession *)session
+          dataTask:(NSURLSessionDataTask *)dataTask
+ willCacheResponse:(NSCachedURLResponse *)proposedResponse
+ completionHandler:(void (^)(NSCachedURLResponse *cachedResponse))completionHandler {
+    
+    NSCachedURLResponse *cachedResponse = proposedResponse;
+
+    if (!(self.options & SDWebImageDownloaderUseNSURLCache)) {
+        // Prevents caching of responses
+        cachedResponse = nil;
+    }
+    if (completionHandler) {
+        completionHandler(cachedResponse);
+    }
+}
+
+#pragma mark NSURLSessionTaskDelegate
+
+- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error {
+    // If we already cancel the operation or anything mark the operation finished, don't callback twice
+    if (self.isFinished) return;
+    
+    self.downloadCompleted = YES;
+    
+    NSArray<SDWebImageDownloaderOperationToken *> *tokens;
+    @synchronized (self) {
+        tokens = [self.callbackTokens copy];
+        self.dataTask = nil;
+        __block typeof(self) strongSelf = self;
+        dispatch_async(dispatch_get_main_queue(), ^{
+            [[NSNotificationCenter defaultCenter] postNotificationName:SDWebImageDownloadStopNotification object:strongSelf];
+            if (!error) {
+                [[NSNotificationCenter defaultCenter] postNotificationName:SDWebImageDownloadFinishNotification object:strongSelf];
+            }
+        });
+    }
+    
+    // make sure to call `[self done]` to mark operation as finished
+    if (error) {
+        // custom error instead of URLSession error
+        if (self.responseError) {
+            error = self.responseError;
+        }
+        [self callCompletionBlocksWithError:error];
+        [self done];
+    } else {
+        if (tokens.count > 0) {
+            NSData *imageData = self.imageData;
+            // data decryptor
+            if (imageData && self.decryptor) {
+                imageData = [self.decryptor decryptedDataWithData:imageData response:self.response];
+            }
+            if (imageData) {
+                /**  if you specified to only use cached data via `SDWebImageDownloaderIgnoreCachedResponse`,
+                 *  then we should check if the cached data is equal to image data
+                 */
+                if (self.options & SDWebImageDownloaderIgnoreCachedResponse && [self.cachedData isEqualToData:imageData]) {
+                    self.responseError = [NSError errorWithDomain:SDWebImageErrorDomain
+                                                             code:SDWebImageErrorCacheNotModified
+                                                         userInfo:@{NSLocalizedDescriptionKey : @"Downloaded image is not modified and ignored",
+                                                                    SDWebImageErrorDownloadResponseKey : self.response}];
+                    // call completion block with not modified error
+                    [self callCompletionBlocksWithError:self.responseError];
+                    [self done];
+                } else {
+                    // decode the image in coder queue, cancel all previous decoding process
+                    [self.coderQueue cancelAllOperations];
+                    [self startCoderOperationWithImageData:imageData
+                                             pendingTokens:tokens
+                                            finishedTokens:@[]];
+                }
+            } else {
+                [self callCompletionBlocksWithError:[NSError errorWithDomain:SDWebImageErrorDomain code:SDWebImageErrorBadImageData userInfo:@{NSLocalizedDescriptionKey : @"Image data is nil"}]];
+                [self done];
+            }
+        } else {
+            [self done];
+        }
+    }
+}
+
+- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential *credential))completionHandler {
+    
+    NSURLSessionAuthChallengeDisposition disposition = NSURLSessionAuthChallengePerformDefaultHandling;
+    __block NSURLCredential *credential = nil;
+    
+    if ([challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust]) {
+        if (!(self.options & SDWebImageDownloaderAllowInvalidSSLCertificates)) {
+            disposition = NSURLSessionAuthChallengePerformDefaultHandling;
+        } else {
+            credential = [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust];
+            disposition = NSURLSessionAuthChallengeUseCredential;
+        }
+    } else {
+        if (challenge.previousFailureCount == 0) {
+            if (self.credential) {
+                credential = self.credential;
+                disposition = NSURLSessionAuthChallengeUseCredential;
+            } else {
+                // Web Server like Nginx can set `ssl_verify_client` to optional but not always on
+                // We'd better use default handling here
+                disposition = NSURLSessionAuthChallengePerformDefaultHandling;
+            }
+        } else {
+            disposition = NSURLSessionAuthChallengeCancelAuthenticationChallenge;
+        }
+    }
+    
+    if (completionHandler) {
+        completionHandler(disposition, credential);
+    }
+}
+
+- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didFinishCollectingMetrics:(NSURLSessionTaskMetrics *)metrics API_AVAILABLE(macos(10.12), ios(10.0), watchos(3.0), tvos(10.0)) {
+    self.metrics = metrics;
+}
+
+#pragma mark Helper methods
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
++ (SDWebImageOptions)imageOptionsFromDownloaderOptions:(SDWebImageDownloaderOptions)downloadOptions {
+    SDWebImageOptions options = 0;
+    if (downloadOptions & SDWebImageDownloaderScaleDownLargeImages) options |= SDWebImageScaleDownLargeImages;
+    if (downloadOptions & SDWebImageDownloaderDecodeFirstFrameOnly) options |= SDWebImageDecodeFirstFrameOnly;
+    if (downloadOptions & SDWebImageDownloaderPreloadAllFrames) options |= SDWebImagePreloadAllFrames;
+    if (downloadOptions & SDWebImageDownloaderAvoidDecodeImage) options |= SDWebImageAvoidDecodeImage;
+    if (downloadOptions & SDWebImageDownloaderMatchAnimatedImageClass) options |= SDWebImageMatchAnimatedImageClass;
+    
+    return options;
+}
+#pragma clang diagnostic pop
+
+- (BOOL)shouldContinueWhenAppEntersBackground {
+    return SD_OPTIONS_CONTAINS(self.options, SDWebImageDownloaderContinueInBackground);
+}
+
+- (void)callCompletionBlocksWithError:(nullable NSError *)error {
+    [self callCompletionBlocksWithImage:nil imageData:nil error:error finished:YES];
+}
+
+- (void)callCompletionBlocksWithImage:(nullable UIImage *)image
+                            imageData:(nullable NSData *)imageData
+                                error:(nullable NSError *)error
+                             finished:(BOOL)finished {
+    NSArray<SDWebImageDownloaderOperationToken *> *tokens;
+    @synchronized (self) {
+        tokens = [self.callbackTokens copy];
+    }
+    for (SDWebImageDownloaderOperationToken *token in tokens) {
+        SDWebImageDownloaderCompletedBlock completedBlock = token.completedBlock;
+        if (completedBlock) {
+            SDCallbackQueue *queue = self.context[SDWebImageContextCallbackQueue];
+            [(queue ?: SDCallbackQueue.mainQueue) async:^{
+                completedBlock(image, imageData, error, finished);
+            }];
+        }
+    }
+}
+
+- (void)callCompletionBlockWithToken:(nonnull SDWebImageDownloaderOperationToken *)token
+                               image:(nullable UIImage *)image
+                           imageData:(nullable NSData *)imageData
+                               error:(nullable NSError *)error
+                            finished:(BOOL)finished {
+    SDWebImageDownloaderCompletedBlock completedBlock = token.completedBlock;
+    if (completedBlock) {
+        SDCallbackQueue *queue = self.context[SDWebImageContextCallbackQueue];
+        [(queue ?: SDCallbackQueue.mainQueue) async:^{
+            completedBlock(image, imageData, error, finished);
+        }];
+    }
+}
+
+@end
diff --git a/SDWebImage/Core/SDWebImageDownloaderRequestModifier.h b/SDWebImage/Core/SDWebImageDownloaderRequestModifier.h
new file mode 100644
index 000000000..94009977a
--- /dev/null
+++ b/SDWebImage/Core/SDWebImageDownloaderRequestModifier.h
@@ -0,0 +1,72 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCompat.h"
+
+typedef NSURLRequest * _Nullable (^SDWebImageDownloaderRequestModifierBlock)(NSURLRequest * _Nonnull request);
+
+/**
+ This is the protocol for downloader request modifier.
+ We can use a block to specify the downloader request modifier. But Using protocol can make this extensible, and allow Swift user to use it easily instead of using `@convention(block)` to store a block into context options.
+ */
+@protocol SDWebImageDownloaderRequestModifier <NSObject>
+
+/// Modify the original URL request and return a new one instead. You can modify the HTTP header, cachePolicy, etc for this URL.
+/// @param request The original URL request for image loading
+/// @note If return nil, the URL request will be cancelled.
+- (nullable NSURLRequest *)modifiedRequestWithRequest:(nonnull NSURLRequest *)request;
+
+@end
+
+/**
+ A downloader request modifier class with block.
+ */
+@interface SDWebImageDownloaderRequestModifier : NSObject <SDWebImageDownloaderRequestModifier>
+
+/// Create the request modifier with block
+/// @param block A block to control modifier logic
+- (nonnull instancetype)initWithBlock:(nonnull SDWebImageDownloaderRequestModifierBlock)block;
+
+/// Create the request modifier with block
+/// @param block A block to control modifier logic
++ (nonnull instancetype)requestModifierWithBlock:(nonnull SDWebImageDownloaderRequestModifierBlock)block;
+
+- (nonnull instancetype)init NS_UNAVAILABLE;
++ (nonnull instancetype)new  NS_UNAVAILABLE;
+
+@end
+
+/**
+A convenient request modifier to provide the HTTP request including HTTP Method, Headers and Body.
+*/
+@interface SDWebImageDownloaderRequestModifier (Conveniences)
+
+/// Create the request modifier with HTTP Method.
+/// @param method HTTP Method, nil means to GET.
+/// @note This is for convenience, if you need code to control the logic, use block API instead.
+- (nonnull instancetype)initWithMethod:(nullable NSString *)method;
+
+/// Create the request modifier with HTTP Headers.
+/// @param headers HTTP Headers. Case insensitive according to HTTP/1.1(HTTP/2) standard. The headers will override the same fields from original request.
+/// @note This is for convenience, if you need code to control the logic, use block API instead.
+- (nonnull instancetype)initWithHeaders:(nullable NSDictionary<NSString *, NSString *> *)headers;
+
+/// Create the request modifier with HTTP Body.
+/// @param body HTTP Body.
+/// @note This is for convenience, if you need code to control the logic, use block API instead.
+- (nonnull instancetype)initWithBody:(nullable NSData *)body;
+
+/// Create the request modifier with HTTP Method, Headers and Body.
+/// @param method HTTP Method, nil means to GET.
+/// @param headers HTTP Headers. Case insensitive according to HTTP/1.1(HTTP/2) standard. The headers will override the same fields from original request.
+/// @param body HTTP Body.
+/// @note This is for convenience, if you need code to control the logic, use block API instead.
+- (nonnull instancetype)initWithMethod:(nullable NSString *)method headers:(nullable NSDictionary<NSString *, NSString *> *)headers body:(nullable NSData *)body;
+
+@end
diff --git a/SDWebImage/Core/SDWebImageDownloaderRequestModifier.m b/SDWebImage/Core/SDWebImageDownloaderRequestModifier.m
new file mode 100644
index 000000000..c12c84f8b
--- /dev/null
+++ b/SDWebImage/Core/SDWebImageDownloaderRequestModifier.m
@@ -0,0 +1,71 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageDownloaderRequestModifier.h"
+
+@interface SDWebImageDownloaderRequestModifier ()
+
+@property (nonatomic, copy, nonnull) SDWebImageDownloaderRequestModifierBlock block;
+
+@end
+
+@implementation SDWebImageDownloaderRequestModifier
+
+- (instancetype)initWithBlock:(SDWebImageDownloaderRequestModifierBlock)block {
+    self = [super init];
+    if (self) {
+        self.block = block;
+    }
+    return self;
+}
+
++ (instancetype)requestModifierWithBlock:(SDWebImageDownloaderRequestModifierBlock)block {
+    SDWebImageDownloaderRequestModifier *requestModifier = [[SDWebImageDownloaderRequestModifier alloc] initWithBlock:block];
+    return requestModifier;
+}
+
+- (NSURLRequest *)modifiedRequestWithRequest:(NSURLRequest *)request {
+    if (!self.block) {
+        return nil;
+    }
+    return self.block(request);
+}
+
+@end
+
+@implementation SDWebImageDownloaderRequestModifier (Conveniences)
+
+- (instancetype)initWithMethod:(NSString *)method {
+    return [self initWithMethod:method headers:nil body:nil];
+}
+
+- (instancetype)initWithHeaders:(NSDictionary<NSString *,NSString *> *)headers {
+    return [self initWithMethod:nil headers:headers body:nil];
+}
+
+- (instancetype)initWithBody:(NSData *)body {
+    return [self initWithMethod:nil headers:nil body:body];
+}
+
+- (instancetype)initWithMethod:(NSString *)method headers:(NSDictionary<NSString *,NSString *> *)headers body:(NSData *)body {
+    method = method ? [method copy] : @"GET";
+    headers = [headers copy];
+    body = [body copy];
+    return [self initWithBlock:^NSURLRequest * _Nullable(NSURLRequest * _Nonnull request) {
+        NSMutableURLRequest *mutableRequest = [request mutableCopy];
+        mutableRequest.HTTPMethod = method;
+        mutableRequest.HTTPBody = body;
+        for (NSString *header in headers) {
+            NSString *value = headers[header];
+            [mutableRequest setValue:value forHTTPHeaderField:header];
+        }
+        return [mutableRequest copy];
+    }];
+}
+
+@end
diff --git a/SDWebImage/Core/SDWebImageDownloaderResponseModifier.h b/SDWebImage/Core/SDWebImageDownloaderResponseModifier.h
new file mode 100644
index 000000000..009e6a181
--- /dev/null
+++ b/SDWebImage/Core/SDWebImageDownloaderResponseModifier.h
@@ -0,0 +1,72 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCompat.h"
+
+typedef NSURLResponse * _Nullable (^SDWebImageDownloaderResponseModifierBlock)(NSURLResponse * _Nonnull response);
+
+/**
+ This is the protocol for downloader response modifier.
+ We can use a block to specify the downloader response modifier. But Using protocol can make this extensible, and allow Swift user to use it easily instead of using `@convention(block)` to store a block into context options.
+ */
+@protocol SDWebImageDownloaderResponseModifier <NSObject>
+
+/// Modify the original URL response and return a new response. You can use this to check MIME-Type, mock server response, etc.
+/// @param response The original URL response, note for HTTP request it's actually a `NSHTTPURLResponse` instance
+/// @note If nil is returned, the image download will marked as cancelled with error `SDWebImageErrorInvalidDownloadResponse`
+- (nullable NSURLResponse *)modifiedResponseWithResponse:(nonnull NSURLResponse *)response;
+
+@end
+
+/**
+ A downloader response modifier class with block.
+ */
+@interface SDWebImageDownloaderResponseModifier : NSObject <SDWebImageDownloaderResponseModifier>
+
+/// Create the response modifier with block
+/// @param block A block to control modifier logic
+- (nonnull instancetype)initWithBlock:(nonnull SDWebImageDownloaderResponseModifierBlock)block;
+
+/// Create the response modifier with block
+/// @param block A block to control modifier logic
++ (nonnull instancetype)responseModifierWithBlock:(nonnull SDWebImageDownloaderResponseModifierBlock)block;
+
+- (nonnull instancetype)init NS_UNAVAILABLE;
++ (nonnull instancetype)new  NS_UNAVAILABLE;
+
+@end
+
+/**
+A convenient response modifier to provide the HTTP response including HTTP Status Code, Version and Headers.
+*/
+@interface SDWebImageDownloaderResponseModifier (Conveniences)
+
+/// Create the response modifier with HTTP Status code.
+/// @param statusCode HTTP Status Code.
+/// @note This is for convenience, if you need code to control the logic, use block API instead.
+- (nonnull instancetype)initWithStatusCode:(NSInteger)statusCode;
+
+/// Create the response modifier with HTTP Version. Status code defaults to 200.
+/// @param version HTTP Version, nil means "HTTP/1.1".
+/// @note This is for convenience, if you need code to control the logic, use block API instead.
+- (nonnull instancetype)initWithVersion:(nullable NSString *)version;
+
+/// Create the response modifier with HTTP Headers. Status code defaults to 200.
+/// @param headers HTTP Headers. Case insensitive according to HTTP/1.1(HTTP/2) standard. The headers will override the same fields from original response.
+/// @note This is for convenience, if you need code to control the logic, use block API instead.
+- (nonnull instancetype)initWithHeaders:(nullable NSDictionary<NSString *, NSString *> *)headers;
+
+/// Create the response modifier with HTTP Status Code, Version and Headers.
+/// @param statusCode HTTP Status Code.
+/// @param version HTTP Version, nil means "HTTP/1.1".
+/// @param headers HTTP Headers. Case insensitive according to HTTP/1.1(HTTP/2) standard. The headers will override the same fields from original response.
+/// @note This is for convenience, if you need code to control the logic, use block API instead.
+- (nonnull instancetype)initWithStatusCode:(NSInteger)statusCode version:(nullable NSString *)version headers:(nullable NSDictionary<NSString *, NSString *> *)headers;
+
+@end
diff --git a/SDWebImage/Core/SDWebImageDownloaderResponseModifier.m b/SDWebImage/Core/SDWebImageDownloaderResponseModifier.m
new file mode 100644
index 000000000..6acf02a26
--- /dev/null
+++ b/SDWebImage/Core/SDWebImageDownloaderResponseModifier.m
@@ -0,0 +1,73 @@
+/*
+* This file is part of the SDWebImage package.
+* (c) Olivier Poitrey <rs@dailymotion.com>
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code.
+*/
+
+
+#import "SDWebImageDownloaderResponseModifier.h"
+
+@interface SDWebImageDownloaderResponseModifier ()
+
+@property (nonatomic, copy, nonnull) SDWebImageDownloaderResponseModifierBlock block;
+
+@end
+
+@implementation SDWebImageDownloaderResponseModifier
+
+- (instancetype)initWithBlock:(SDWebImageDownloaderResponseModifierBlock)block {
+    self = [super init];
+    if (self) {
+        self.block = block;
+    }
+    return self;
+}
+
++ (instancetype)responseModifierWithBlock:(SDWebImageDownloaderResponseModifierBlock)block {
+    SDWebImageDownloaderResponseModifier *responseModifier = [[SDWebImageDownloaderResponseModifier alloc] initWithBlock:block];
+    return responseModifier;
+}
+
+- (nullable NSURLResponse *)modifiedResponseWithResponse:(nonnull NSURLResponse *)response {
+    if (!self.block) {
+        return nil;
+    }
+    return self.block(response);
+}
+
+@end
+
+@implementation SDWebImageDownloaderResponseModifier (Conveniences)
+
+- (instancetype)initWithStatusCode:(NSInteger)statusCode {
+    return [self initWithStatusCode:statusCode version:nil headers:nil];
+}
+
+- (instancetype)initWithVersion:(NSString *)version {
+    return [self initWithStatusCode:200 version:version headers:nil];
+}
+
+- (instancetype)initWithHeaders:(NSDictionary<NSString *,NSString *> *)headers {
+    return [self initWithStatusCode:200 version:nil headers:headers];
+}
+
+- (instancetype)initWithStatusCode:(NSInteger)statusCode version:(NSString *)version headers:(NSDictionary<NSString *,NSString *> *)headers {
+    version = version ? [version copy] : @"HTTP/1.1";
+    headers = [headers copy];
+    return [self initWithBlock:^NSURLResponse * _Nullable(NSURLResponse * _Nonnull response) {
+        if (![response isKindOfClass:NSHTTPURLResponse.class]) {
+            return response;
+        }
+        NSMutableDictionary *mutableHeaders = [((NSHTTPURLResponse *)response).allHeaderFields mutableCopy];
+        for (NSString *header in headers) {
+            NSString *value = headers[header];
+            mutableHeaders[header] = value;
+        }
+        NSHTTPURLResponse *httpResponse = [[NSHTTPURLResponse alloc] initWithURL:response.URL statusCode:statusCode HTTPVersion:version headerFields:[mutableHeaders copy]];
+        return httpResponse;
+    }];
+}
+
+@end
diff --git a/SDWebImage/Core/SDWebImageError.h b/SDWebImage/Core/SDWebImageError.h
new file mode 100644
index 000000000..652b0d773
--- /dev/null
+++ b/SDWebImage/Core/SDWebImageError.h
@@ -0,0 +1,33 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ * (c) Jamie Pinkham
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+
+/// An error domain represent SDWebImage loading system with custom codes
+FOUNDATION_EXPORT NSErrorDomain const _Nonnull SDWebImageErrorDomain;
+
+/// The response instance for invalid download response (NSURLResponse *)
+FOUNDATION_EXPORT NSErrorUserInfoKey const _Nonnull SDWebImageErrorDownloadResponseKey;
+/// The HTTP status code for invalid download response (NSNumber *)
+FOUNDATION_EXPORT NSErrorUserInfoKey const _Nonnull SDWebImageErrorDownloadStatusCodeKey;
+/// The HTTP MIME content type for invalid download response (NSString *)
+FOUNDATION_EXPORT NSErrorUserInfoKey const _Nonnull SDWebImageErrorDownloadContentTypeKey;
+
+/// SDWebImage error domain and codes
+typedef NS_ERROR_ENUM(SDWebImageErrorDomain, SDWebImageError) {
+    SDWebImageErrorInvalidURL = 1000, // The URL is invalid, such as nil URL or corrupted URL
+    SDWebImageErrorBadImageData = 1001, // The image data can not be decoded to image, or the image data is empty
+    SDWebImageErrorCacheNotModified = 1002, // The remote location specify that the cached image is not modified, such as the HTTP response 304 code. It's useful for `SDWebImageRefreshCached`
+    SDWebImageErrorBlackListed = 1003, // The URL is blacklisted because of unrecoverable failure marked by downloader (such as 404), you can use `.retryFailed` option to avoid this
+    SDWebImageErrorInvalidDownloadOperation = 2000, // The image download operation is invalid, such as nil operation or unexpected error occur when operation initialized
+    SDWebImageErrorInvalidDownloadStatusCode = 2001, // The image download response a invalid status code. You can check the status code in error's userInfo under `SDWebImageErrorDownloadStatusCodeKey`
+    SDWebImageErrorCancelled = 2002, // The image loading operation is cancelled before finished, during either async disk cache query, or waiting before actual network request. For actual network request error, check `NSURLErrorDomain` error domain and code.
+    SDWebImageErrorInvalidDownloadResponse = 2003, // When using response modifier, the modified download response is nil and marked as failed.
+    SDWebImageErrorInvalidDownloadContentType = 2004, // The image download response a invalid content type. You can check the MIME content type in error's userInfo under `SDWebImageErrorDownloadContentTypeKey`
+};
diff --git a/SDWebImage/Core/SDWebImageError.m b/SDWebImage/Core/SDWebImageError.m
new file mode 100644
index 000000000..bd0d17ad9
--- /dev/null
+++ b/SDWebImage/Core/SDWebImageError.m
@@ -0,0 +1,16 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ * (c) Jamie Pinkham
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageError.h"
+
+NSErrorDomain const _Nonnull SDWebImageErrorDomain = @"SDWebImageErrorDomain";
+
+NSErrorUserInfoKey const _Nonnull SDWebImageErrorDownloadResponseKey = @"SDWebImageErrorDownloadResponseKey";
+NSErrorUserInfoKey const _Nonnull SDWebImageErrorDownloadStatusCodeKey = @"SDWebImageErrorDownloadStatusCodeKey";
+NSErrorUserInfoKey const _Nonnull SDWebImageErrorDownloadContentTypeKey = @"SDWebImageErrorDownloadContentTypeKey";
diff --git a/SDWebImage/Core/SDWebImageIndicator.h b/SDWebImage/Core/SDWebImageIndicator.h
new file mode 100644
index 000000000..522dc4740
--- /dev/null
+++ b/SDWebImage/Core/SDWebImageIndicator.h
@@ -0,0 +1,119 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+
+#if SD_UIKIT || SD_MAC
+
+/**
+ A protocol to custom the indicator during the image loading.
+ All of these methods are called from main queue.
+ */
+@protocol SDWebImageIndicator <NSObject>
+
+@required
+/**
+ The view associate to the indicator.
+
+ @return The indicator view
+ */
+@property (nonatomic, strong, readonly, nonnull) UIView *indicatorView;
+
+/**
+ Start the animating for indicator.
+ */
+- (void)startAnimatingIndicator;
+
+/**
+ Stop the animating for indicator.
+ */
+- (void)stopAnimatingIndicator;
+
+@optional
+/**
+ Update the loading progress (0-1.0) for indicator. Optional
+ 
+ @param progress The progress, value between 0 and 1.0
+ */
+- (void)updateIndicatorProgress:(double)progress;
+
+@end
+
+#pragma mark - Activity Indicator
+
+/**
+ Activity indicator class.
+ for UIKit(macOS), it use a `UIActivityIndicatorView`.
+ for AppKit(macOS), it use a `NSProgressIndicator` with the spinning style.
+ */
+@interface SDWebImageActivityIndicator : NSObject <SDWebImageIndicator>
+
+#if SD_UIKIT
+@property (nonatomic, strong, readonly, nonnull) UIActivityIndicatorView *indicatorView;
+#else
+@property (nonatomic, strong, readonly, nonnull) NSProgressIndicator *indicatorView;
+#endif
+
+@end
+
+/**
+ Convenience way to use activity indicator.
+ */
+@interface SDWebImageActivityIndicator (Conveniences)
+
+#if !SD_VISION
+/// These indicator use the fixed color without dark mode support
+/// gray-style activity indicator
+@property (nonatomic, class, nonnull, readonly) SDWebImageActivityIndicator *grayIndicator;
+/// large gray-style activity indicator
+@property (nonatomic, class, nonnull, readonly) SDWebImageActivityIndicator *grayLargeIndicator;
+/// white-style activity indicator
+@property (nonatomic, class, nonnull, readonly) SDWebImageActivityIndicator *whiteIndicator;
+/// large white-style activity indicator
+@property (nonatomic, class, nonnull, readonly) SDWebImageActivityIndicator *whiteLargeIndicator;
+#endif
+/// These indicator use the system style, supports dark mode if available (iOS 13+/macOS 10.14+)
+/// large activity indicator
+@property (nonatomic, class, nonnull, readonly) SDWebImageActivityIndicator *largeIndicator;
+/// medium activity indicator
+@property (nonatomic, class, nonnull, readonly) SDWebImageActivityIndicator *mediumIndicator;
+
+@end
+
+#pragma mark - Progress Indicator
+
+/**
+ Progress indicator class.
+ for UIKit(macOS), it use a `UIProgressView`.
+ for AppKit(macOS), it use a `NSProgressIndicator` with the bar style.
+ */
+@interface SDWebImageProgressIndicator : NSObject <SDWebImageIndicator>
+
+#if SD_UIKIT
+@property (nonatomic, strong, readonly, nonnull) UIProgressView *indicatorView;
+#else
+@property (nonatomic, strong, readonly, nonnull) NSProgressIndicator *indicatorView;
+#endif
+
+@end
+
+/**
+ Convenience way to create progress indicator. Remember to specify the indicator width or use layout constraint if need.
+ */
+@interface SDWebImageProgressIndicator (Conveniences)
+
+/// default-style progress indicator
+@property (nonatomic, class, nonnull, readonly) SDWebImageProgressIndicator *defaultIndicator;
+#if SD_UIKIT
+/// bar-style progress indicator
+@property (nonatomic, class, nonnull, readonly) SDWebImageProgressIndicator *barIndicator API_UNAVAILABLE(tvos);
+#endif
+
+@end
+
+#endif
diff --git a/SDWebImage/Core/SDWebImageIndicator.m b/SDWebImage/Core/SDWebImageIndicator.m
new file mode 100644
index 000000000..031d6c9a4
--- /dev/null
+++ b/SDWebImage/Core/SDWebImageIndicator.m
@@ -0,0 +1,291 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageIndicator.h"
+
+#if SD_UIKIT || SD_MAC
+
+#if SD_MAC
+#import <QuartzCore/QuartzCore.h>
+#import <CoreImage/CIFilter.h>
+#endif
+
+#pragma mark - Activity Indicator
+
+@interface SDWebImageActivityIndicator ()
+
+#if SD_UIKIT
+@property (nonatomic, strong, readwrite, nonnull) UIActivityIndicatorView *indicatorView;
+#else
+@property (nonatomic, strong, readwrite, nonnull) NSProgressIndicator *indicatorView;
+#endif
+
+@end
+
+@implementation SDWebImageActivityIndicator
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        [self commonInit];
+    }
+    return self;
+}
+
+#if SD_UIKIT
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+- (void)commonInit {
+#if SD_VISION
+    UIActivityIndicatorViewStyle style = UIActivityIndicatorViewStyleMedium;
+#else
+    UIActivityIndicatorViewStyle style;
+    if (@available(iOS 13.0, tvOS 13.0, *)) {
+        style = UIActivityIndicatorViewStyleMedium;
+    } else {
+        style = UIActivityIndicatorViewStyleWhite;
+    }
+#endif
+    self.indicatorView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:style];
+    self.indicatorView.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleBottomMargin;
+}
+#pragma clang diagnostic pop
+#endif
+
+#if SD_MAC
+- (void)commonInit {
+    self.indicatorView = [[NSProgressIndicator alloc] initWithFrame:NSZeroRect];
+    self.indicatorView.style = NSProgressIndicatorStyleSpinning;
+    self.indicatorView.controlSize = NSControlSizeSmall;
+    [self.indicatorView sizeToFit];
+    self.indicatorView.autoresizingMask = NSViewMaxXMargin | NSViewMinXMargin | NSViewMaxYMargin | NSViewMinYMargin;
+}
+#endif
+
+- (void)startAnimatingIndicator {
+#if SD_UIKIT
+    [self.indicatorView startAnimating];
+#else
+    [self.indicatorView startAnimation:nil];
+#endif
+    self.indicatorView.hidden = NO;
+}
+
+- (void)stopAnimatingIndicator {
+#if SD_UIKIT
+    [self.indicatorView stopAnimating];
+#else
+    [self.indicatorView stopAnimation:nil];
+#endif
+    self.indicatorView.hidden = YES;
+}
+
+@end
+
+@implementation SDWebImageActivityIndicator (Conveniences)
+
+#if !SD_VISION
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
++ (SDWebImageActivityIndicator *)grayIndicator {
+    SDWebImageActivityIndicator *indicator = [SDWebImageActivityIndicator new];
+#if SD_UIKIT
+#if SD_IOS
+    indicator.indicatorView.activityIndicatorViewStyle = UIActivityIndicatorViewStyleGray;
+#else
+    indicator.indicatorView.color = [UIColor colorWithWhite:0 alpha:0.45]; // Color from `UIActivityIndicatorViewStyleGray`
+#endif
+#else
+    indicator.indicatorView.appearance = [NSAppearance appearanceNamed:NSAppearanceNameAqua]; // Disable dark mode support
+#endif
+    return indicator;
+}
+
++ (SDWebImageActivityIndicator *)grayLargeIndicator {
+    SDWebImageActivityIndicator *indicator = SDWebImageActivityIndicator.grayIndicator;
+#if SD_UIKIT
+    UIColor *grayColor = indicator.indicatorView.color;
+    indicator.indicatorView.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;
+    indicator.indicatorView.color = grayColor;
+#else
+    indicator.indicatorView.appearance = [NSAppearance appearanceNamed:NSAppearanceNameAqua]; // Disable dark mode support
+    indicator.indicatorView.controlSize = NSControlSizeRegular;
+#endif
+    [indicator.indicatorView sizeToFit];
+    return indicator;
+}
+
++ (SDWebImageActivityIndicator *)whiteIndicator {
+    SDWebImageActivityIndicator *indicator = [SDWebImageActivityIndicator new];
+#if SD_UIKIT
+    indicator.indicatorView.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhite;
+#else
+    indicator.indicatorView.appearance = [NSAppearance appearanceNamed:NSAppearanceNameAqua]; // Disable dark mode support
+    CIFilter *lighten = [CIFilter filterWithName:@"CIColorControls"];
+    [lighten setDefaults];
+    [lighten setValue:@(1) forKey:kCIInputBrightnessKey];
+    indicator.indicatorView.contentFilters = @[lighten];
+#endif
+    return indicator;
+}
+
++ (SDWebImageActivityIndicator *)whiteLargeIndicator {
+    SDWebImageActivityIndicator *indicator = SDWebImageActivityIndicator.whiteIndicator;
+#if SD_UIKIT
+    indicator.indicatorView.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;
+#else
+    indicator.indicatorView.appearance = [NSAppearance appearanceNamed:NSAppearanceNameAqua]; // Disable dark mode support
+    indicator.indicatorView.controlSize = NSControlSizeRegular;
+    [indicator.indicatorView sizeToFit];
+#endif
+    return indicator;
+}
+#endif
+
++ (SDWebImageActivityIndicator *)largeIndicator {
+    SDWebImageActivityIndicator *indicator = [SDWebImageActivityIndicator new];
+#if SD_VISION
+    indicator.indicatorView.activityIndicatorViewStyle = UIActivityIndicatorViewStyleLarge;
+#elif SD_UIKIT
+    if (@available(iOS 13.0, tvOS 13.0, *)) {
+        indicator.indicatorView.activityIndicatorViewStyle = UIActivityIndicatorViewStyleLarge;
+    } else {
+        indicator.indicatorView.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;
+    }
+#else
+    indicator.indicatorView.controlSize = NSControlSizeRegular;
+    [indicator.indicatorView sizeToFit];
+#endif
+    return indicator;
+}
+
++ (SDWebImageActivityIndicator *)mediumIndicator {
+    SDWebImageActivityIndicator *indicator = [SDWebImageActivityIndicator new];
+#if SD_VISION
+    indicator.indicatorView.activityIndicatorViewStyle = UIActivityIndicatorViewStyleMedium;
+#elif SD_UIKIT
+    if (@available(iOS 13.0, tvOS 13.0, *)) {
+        indicator.indicatorView.activityIndicatorViewStyle = UIActivityIndicatorViewStyleMedium;
+    } else {
+        indicator.indicatorView.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhite;
+    }
+#else
+    indicator.indicatorView.controlSize = NSControlSizeSmall;
+    [indicator.indicatorView sizeToFit];
+#endif
+    return indicator;
+}
+#pragma clang diagnostic pop
+
+@end
+
+#pragma mark - Progress Indicator
+
+@interface SDWebImageProgressIndicator ()
+
+#if SD_UIKIT
+@property (nonatomic, strong, readwrite, nonnull) UIProgressView *indicatorView;
+#else
+@property (nonatomic, strong, readwrite, nonnull) NSProgressIndicator *indicatorView;
+#endif
+
+@end
+
+@implementation SDWebImageProgressIndicator
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        [self commonInit];
+    }
+    return self;
+}
+
+#if SD_UIKIT
+- (void)commonInit {
+    self.indicatorView = [[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleDefault];
+    self.indicatorView.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleBottomMargin;
+}
+#endif
+
+#if SD_MAC
+- (void)commonInit {
+    self.indicatorView = [[NSProgressIndicator alloc] initWithFrame:NSMakeRect(0, 0, 160, 0)]; // Width from `UIProgressView` default width
+    self.indicatorView.style = NSProgressIndicatorStyleBar;
+    self.indicatorView.controlSize = NSControlSizeSmall;
+    [self.indicatorView sizeToFit];
+    self.indicatorView.autoresizingMask = NSViewMaxXMargin | NSViewMinXMargin | NSViewMaxYMargin | NSViewMinYMargin;
+}
+#endif
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunguarded-availability"
+- (void)startAnimatingIndicator {
+    self.indicatorView.hidden = NO;
+#if SD_UIKIT
+    if ([self.indicatorView respondsToSelector:@selector(observedProgress)] && self.indicatorView.observedProgress) {
+        // Ignore NSProgress
+    } else {
+        self.indicatorView.progress = 0;
+    }
+#else
+    self.indicatorView.indeterminate = YES;
+    self.indicatorView.doubleValue = 0;
+    [self.indicatorView startAnimation:nil];
+#endif
+}
+
+- (void)stopAnimatingIndicator {
+    self.indicatorView.hidden = YES;
+#if SD_UIKIT
+    if ([self.indicatorView respondsToSelector:@selector(observedProgress)] && self.indicatorView.observedProgress) {
+        // Ignore NSProgress
+    } else {
+        self.indicatorView.progress = 1;
+    }
+#else
+    self.indicatorView.indeterminate = NO;
+    self.indicatorView.doubleValue = 100;
+    [self.indicatorView stopAnimation:nil];
+#endif
+}
+
+- (void)updateIndicatorProgress:(double)progress {
+#if SD_UIKIT
+    if ([self.indicatorView respondsToSelector:@selector(observedProgress)] && self.indicatorView.observedProgress) {
+        // Ignore NSProgress
+    } else {
+        [self.indicatorView setProgress:progress animated:YES];
+    }
+#else
+    self.indicatorView.indeterminate = progress > 0 ? NO : YES;
+    self.indicatorView.doubleValue = progress * 100;
+#endif
+}
+#pragma clang diagnostic pop
+
+@end
+
+@implementation SDWebImageProgressIndicator (Conveniences)
+
++ (SDWebImageProgressIndicator *)defaultIndicator {
+    SDWebImageProgressIndicator *indicator = [SDWebImageProgressIndicator new];
+    return indicator;
+}
+
+#if SD_UIKIT
++ (SDWebImageProgressIndicator *)barIndicator API_UNAVAILABLE(tvos) {
+    SDWebImageProgressIndicator *indicator = [SDWebImageProgressIndicator new];
+    indicator.indicatorView.progressViewStyle = UIProgressViewStyleBar;
+    return indicator;
+}
+#endif
+
+@end
+
+#endif
diff --git a/SDWebImage/Core/SDWebImageManager.h b/SDWebImage/Core/SDWebImageManager.h
new file mode 100644
index 000000000..1219ce3b1
--- /dev/null
+++ b/SDWebImage/Core/SDWebImageManager.h
@@ -0,0 +1,290 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+#import "SDWebImageOperation.h"
+#import "SDImageCacheDefine.h"
+#import "SDImageLoader.h"
+#import "SDImageTransformer.h"
+#import "SDWebImageCacheKeyFilter.h"
+#import "SDWebImageCacheSerializer.h"
+#import "SDWebImageOptionsProcessor.h"
+
+typedef void(^SDExternalCompletionBlock)(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL);
+
+typedef void(^SDInternalCompletionBlock)(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL);
+
+/**
+ A combined operation representing the cache and loader operation. You can use it to cancel the load process.
+ */
+@interface SDWebImageCombinedOperation : NSObject <SDWebImageOperation>
+
+/**
+ Cancel the current operation, including cache and loader process
+ */
+- (void)cancel;
+
+/// Whether the operation has been cancelled.
+@property (nonatomic, assign, readonly, getter=isCancelled) BOOL cancelled;
+
+/**
+ The cache operation from the image cache query
+ */
+@property (strong, nonatomic, nullable, readonly) id<SDWebImageOperation> cacheOperation;
+
+/**
+ The loader operation from the image loader (such as download operation)
+ */
+@property (strong, nonatomic, nullable, readonly) id<SDWebImageOperation> loaderOperation;
+
+@end
+
+
+@class SDWebImageManager;
+
+/**
+ The manager delegate protocol.
+ */
+@protocol SDWebImageManagerDelegate <NSObject>
+
+@optional
+
+/**
+ * Controls which image should be downloaded when the image is not found in the cache.
+ *
+ * @param imageManager The current `SDWebImageManager`
+ * @param imageURL     The url of the image to be downloaded
+ *
+ * @return Return NO to prevent the downloading of the image on cache misses. If not implemented, YES is implied.
+ */
+- (BOOL)imageManager:(nonnull SDWebImageManager *)imageManager shouldDownloadImageForURL:(nonnull NSURL *)imageURL;
+
+/**
+ * Controls the complicated logic to mark as failed URLs when download error occur.
+ * If the delegate implement this method, we will not use the built-in way to mark URL as failed based on error code;
+ @param imageManager The current `SDWebImageManager`
+ @param imageURL The url of the image
+ @param error The download error for the url
+ @return Whether to block this url or not. Return YES to mark this URL as failed.
+ */
+- (BOOL)imageManager:(nonnull SDWebImageManager *)imageManager shouldBlockFailedURL:(nonnull NSURL *)imageURL withError:(nonnull NSError *)error;
+
+@end
+
+/**
+ * The SDWebImageManager is the class behind the UIImageView+WebCache category and likes.
+ * It ties the asynchronous downloader (SDWebImageDownloader) with the image cache store (SDImageCache).
+ * You can use this class directly to benefit from web image downloading with caching in another context than
+ * a UIView.
+ *
+ * Here is a simple example of how to use SDWebImageManager:
+ *
+ * @code
+
+SDWebImageManager *manager = [SDWebImageManager sharedManager];
+[manager loadImageWithURL:imageURL
+                  options:0
+                 progress:nil
+                completed:^(UIImage *image, NSData *data, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {
+                    if (image) {
+                        // do something with image
+                    }
+                }];
+
+ * @endcode
+ */
+@interface SDWebImageManager : NSObject
+
+/**
+ * The delegate for manager. Defaults to nil.
+ */
+@property (weak, nonatomic, nullable) id <SDWebImageManagerDelegate> delegate;
+
+/**
+ * The image cache used by manager to query image cache.
+ */
+@property (strong, nonatomic, readonly, nonnull) id<SDImageCache> imageCache;
+
+/**
+ * The image loader used by manager to load image.
+ */
+@property (strong, nonatomic, readonly, nonnull) id<SDImageLoader> imageLoader;
+
+/**
+ The image transformer for manager. It's used for image transform after the image load finished and store the transformed image to cache, see `SDImageTransformer`.
+ Defaults to nil, which means no transform is applied.
+ @note This will affect all the load requests for this manager if you provide. However, you can pass `SDWebImageContextImageTransformer` in context arg to explicitly use that transformer instead.
+ */
+@property (strong, nonatomic, nullable) id<SDImageTransformer> transformer;
+
+/**
+ * The cache filter is used to convert an URL into a cache key each time SDWebImageManager need cache key to use image cache.
+ *
+ * The following example sets a filter in the application delegate that will remove any query-string from the
+ * URL before to use it as a cache key:
+ *
+ * @code
+ SDWebImageManager.sharedManager.cacheKeyFilter =[SDWebImageCacheKeyFilter cacheKeyFilterWithBlock:^NSString * _Nullable(NSURL * _Nonnull url) {
+    url = [[NSURL alloc] initWithScheme:url.scheme host:url.host path:url.path];
+    return [url absoluteString];
+ }];
+ * @endcode
+ */
+@property (nonatomic, strong, nullable) id<SDWebImageCacheKeyFilter> cacheKeyFilter;
+
+/**
+ * The cache serializer is used to convert the decoded image, the source downloaded data, to the actual data used for storing to the disk cache. If you return nil, means to generate the data from the image instance, see `SDImageCache`.
+ * For example, if you are using WebP images and facing the slow decoding time issue when later retrieving from disk cache again. You can try to encode the decoded image to JPEG/PNG format to disk cache instead of source downloaded data.
+ * @note The `image` arg is nonnull, but when you also provide an image transformer and the image is transformed, the `data` arg may be nil, take attention to this case.
+ * @note This method is called from a global queue in order to not to block the main thread.
+ * @code
+ SDWebImageManager.sharedManager.cacheSerializer = [SDWebImageCacheSerializer cacheSerializerWithBlock:^NSData * _Nullable(UIImage * _Nonnull image, NSData * _Nullable data, NSURL * _Nullable imageURL) {
+    SDImageFormat format = [NSData sd_imageFormatForImageData:data];
+    switch (format) {
+        case SDImageFormatWebP:
+            return image.images ? data : nil;
+        default:
+            return data;
+    }
+}];
+ * @endcode
+ * The default value is nil. Means we just store the source downloaded data to disk cache.
+ */
+@property (nonatomic, strong, nullable) id<SDWebImageCacheSerializer> cacheSerializer;
+
+/**
+ The options processor is used, to have a global control for all the image request options and context option for current manager.
+ @note If you use `transformer`, `cacheKeyFilter` or `cacheSerializer` property of manager, the input context option already apply those properties before passed. This options processor is a better replacement for those property in common usage.
+ For example, you can control the global options, based on the URL or original context option like the below code.
+ 
+ * @code
+ SDWebImageManager.sharedManager.optionsProcessor = [SDWebImageOptionsProcessor optionsProcessorWithBlock:^SDWebImageOptionsResult * _Nullable(NSURL * _Nullable url, SDWebImageOptions options, SDWebImageContext * _Nullable context) {
+     // Only do animation on `SDAnimatedImageView`
+     if (!context[SDWebImageContextAnimatedImageClass]) {
+        options |= SDWebImageDecodeFirstFrameOnly;
+     }
+     // Do not force decode for png url
+     if ([url.lastPathComponent isEqualToString:@"png"]) {
+        options |= SDWebImageAvoidDecodeImage;
+     }
+     // Always use screen scale factor
+     SDWebImageMutableContext *mutableContext = [NSDictionary dictionaryWithDictionary:context];
+     mutableContext[SDWebImageContextImageScaleFactor] = @(UIScreen.mainScreen.scale);
+     context = [mutableContext copy];
+ 
+     return [[SDWebImageOptionsResult alloc] initWithOptions:options context:context];
+ }];
+ * @endcode
+ */
+@property (nonatomic, strong, nullable) id<SDWebImageOptionsProcessor> optionsProcessor;
+
+/**
+ * Check one or more operations running
+ */
+@property (nonatomic, assign, readonly, getter=isRunning) BOOL running;
+
+/**
+ The default image cache when the manager which is created with no arguments. Such as shared manager or init.
+ Defaults to nil. Means using `SDImageCache.sharedImageCache`
+ */
+@property (nonatomic, class, nullable) id<SDImageCache> defaultImageCache;
+
+/**
+ The default image loader for manager which is created with no arguments. Such as shared manager or init.
+ Defaults to nil. Means using `SDWebImageDownloader.sharedDownloader`
+ */
+@property (nonatomic, class, nullable) id<SDImageLoader> defaultImageLoader;
+
+/**
+ * Returns global shared manager instance.
+ */
+@property (nonatomic, class, readonly, nonnull) SDWebImageManager *sharedManager;
+
+/**
+ * Allows to specify instance of cache and image loader used with image manager.
+ * @return new instance of `SDWebImageManager` with specified cache and loader.
+ */
+- (nonnull instancetype)initWithCache:(nonnull id<SDImageCache>)cache loader:(nonnull id<SDImageLoader>)loader NS_DESIGNATED_INITIALIZER;
+
+/**
+ * Downloads the image at the given URL if not present in cache or return the cached version otherwise.
+ *
+ * @param url            The URL to the image
+ * @param options        A mask to specify options to use for this request
+ * @param progressBlock  A block called while image is downloading
+ *                       @note the progress block is executed on a background queue
+ * @param completedBlock A block called when operation has been completed.
+ *
+ *   This parameter is required.
+ * 
+ *   This block has no return value and takes the requested UIImage as first parameter and the NSData representation as second parameter.
+ *   In case of error the image parameter is nil and the third parameter may contain an NSError.
+ *
+ *   The forth parameter is an `SDImageCacheType` enum indicating if the image was retrieved from the local cache
+ *   or from the memory cache or from the network.
+ *
+ *   The fifth parameter is set to NO when the SDWebImageProgressiveLoad option is used and the image is
+ *   downloading. This block is thus called repeatedly with a partial image. When image is fully downloaded, the
+ *   block is called a last time with the full image and the last parameter set to YES.
+ *
+ *   The last parameter is the original image URL
+ *
+ * @return Returns an instance of SDWebImageCombinedOperation, which you can cancel the loading process.
+ */
+- (nullable SDWebImageCombinedOperation *)loadImageWithURL:(nullable NSURL *)url
+                                                   options:(SDWebImageOptions)options
+                                                  progress:(nullable SDImageLoaderProgressBlock)progressBlock
+                                                 completed:(nonnull SDInternalCompletionBlock)completedBlock;
+
+/**
+ * Downloads the image at the given URL if not present in cache or return the cached version otherwise.
+ *
+ * @param url            The URL to the image
+ * @param options        A mask to specify options to use for this request
+ * @param context        A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
+ * @param progressBlock  A block called while image is downloading
+ *                       @note the progress block is executed on a background queue
+ * @param completedBlock A block called when operation has been completed.
+ *
+ * @return Returns an instance of SDWebImageCombinedOperation, which you can cancel the loading process.
+ */
+- (nullable SDWebImageCombinedOperation *)loadImageWithURL:(nullable NSURL *)url
+                                                   options:(SDWebImageOptions)options
+                                                   context:(nullable SDWebImageContext *)context
+                                                  progress:(nullable SDImageLoaderProgressBlock)progressBlock
+                                                 completed:(nonnull SDInternalCompletionBlock)completedBlock;
+
+/**
+ * Cancel all current operations
+ */
+- (void)cancelAll;
+
+/**
+ * Remove the specify URL from failed black list.
+ * @param url The failed URL.
+ */
+- (void)removeFailedURL:(nonnull NSURL *)url;
+
+/**
+ * Remove all the URL from failed black list.
+ */
+- (void)removeAllFailedURLs;
+
+/**
+ * Return the cache key for a given URL, does not considerate transformer or thumbnail.
+ * @note This method does not have context option, only use the url and manager level cacheKeyFilter to generate the cache key.
+ */
+- (nullable NSString *)cacheKeyForURL:(nullable NSURL *)url;
+
+/**
+ * Return the cache key for a given URL and context option.
+ * @note The context option like `.thumbnailPixelSize` and `.imageTransformer` will effect the generated cache key, using this if you have those context associated.
+*/
+- (nullable NSString *)cacheKeyForURL:(nullable NSURL *)url context:(nullable SDWebImageContext *)context;
+
+@end
diff --git a/SDWebImage/Core/SDWebImageManager.m b/SDWebImage/Core/SDWebImageManager.m
new file mode 100644
index 000000000..e3b5add76
--- /dev/null
+++ b/SDWebImage/Core/SDWebImageManager.m
@@ -0,0 +1,816 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageManager.h"
+#import "SDImageCache.h"
+#import "SDWebImageDownloader.h"
+#import "UIImage+Metadata.h"
+#import "SDAssociatedObject.h"
+#import "SDWebImageError.h"
+#import "SDInternalMacros.h"
+#import "SDCallbackQueue.h"
+
+static id<SDImageCache> _defaultImageCache;
+static id<SDImageLoader> _defaultImageLoader;
+
+@interface SDWebImageCombinedOperation ()
+
+@property (assign, nonatomic, getter = isCancelled) BOOL cancelled;
+@property (strong, nonatomic, readwrite, nullable) id<SDWebImageOperation> loaderOperation;
+@property (strong, nonatomic, readwrite, nullable) id<SDWebImageOperation> cacheOperation;
+@property (weak, nonatomic, nullable) SDWebImageManager *manager;
+
+@end
+
+@interface SDWebImageManager () {
+    SD_LOCK_DECLARE(_failedURLsLock); // a lock to keep the access to `failedURLs` thread-safe
+    SD_LOCK_DECLARE(_runningOperationsLock); // a lock to keep the access to `runningOperations` thread-safe
+}
+
+@property (strong, nonatomic, readwrite, nonnull) SDImageCache *imageCache;
+@property (strong, nonatomic, readwrite, nonnull) id<SDImageLoader> imageLoader;
+@property (strong, nonatomic, nonnull) NSMutableSet<NSURL *> *failedURLs;
+@property (strong, nonatomic, nonnull) NSMutableSet<SDWebImageCombinedOperation *> *runningOperations;
+
+@end
+
+@implementation SDWebImageManager
+
++ (id<SDImageCache>)defaultImageCache {
+    return _defaultImageCache;
+}
+
++ (void)setDefaultImageCache:(id<SDImageCache>)defaultImageCache {
+    if (defaultImageCache && ![defaultImageCache conformsToProtocol:@protocol(SDImageCache)]) {
+        return;
+    }
+    _defaultImageCache = defaultImageCache;
+}
+
++ (id<SDImageLoader>)defaultImageLoader {
+    return _defaultImageLoader;
+}
+
++ (void)setDefaultImageLoader:(id<SDImageLoader>)defaultImageLoader {
+    if (defaultImageLoader && ![defaultImageLoader conformsToProtocol:@protocol(SDImageLoader)]) {
+        return;
+    }
+    _defaultImageLoader = defaultImageLoader;
+}
+
++ (nonnull instancetype)sharedManager {
+    static dispatch_once_t once;
+    static id instance;
+    dispatch_once(&once, ^{
+        instance = [self new];
+    });
+    return instance;
+}
+
+- (nonnull instancetype)init {
+    id<SDImageCache> cache = [[self class] defaultImageCache];
+    if (!cache) {
+        cache = [SDImageCache sharedImageCache];
+    }
+    id<SDImageLoader> loader = [[self class] defaultImageLoader];
+    if (!loader) {
+        loader = [SDWebImageDownloader sharedDownloader];
+    }
+    return [self initWithCache:cache loader:loader];
+}
+
+- (nonnull instancetype)initWithCache:(nonnull id<SDImageCache>)cache loader:(nonnull id<SDImageLoader>)loader {
+    if ((self = [super init])) {
+        _imageCache = cache;
+        _imageLoader = loader;
+        _failedURLs = [NSMutableSet new];
+        SD_LOCK_INIT(_failedURLsLock);
+        _runningOperations = [NSMutableSet new];
+        SD_LOCK_INIT(_runningOperationsLock);
+    }
+    return self;
+}
+
+- (nullable NSString *)cacheKeyForURL:(nullable NSURL *)url {
+    if (!url) {
+        return @"";
+    }
+    
+    NSString *key;
+    // Cache Key Filter
+    id<SDWebImageCacheKeyFilter> cacheKeyFilter = self.cacheKeyFilter;
+    if (cacheKeyFilter) {
+        key = [cacheKeyFilter cacheKeyForURL:url];
+    } else {
+        key = url.absoluteString;
+    }
+    
+    return key;
+}
+
+- (nullable NSString *)originalCacheKeyForURL:(nullable NSURL *)url context:(nullable SDWebImageContext *)context {
+    if (!url) {
+        return @"";
+    }
+    
+    NSString *key;
+    // Cache Key Filter
+    id<SDWebImageCacheKeyFilter> cacheKeyFilter = self.cacheKeyFilter;
+    if (context[SDWebImageContextCacheKeyFilter]) {
+        cacheKeyFilter = context[SDWebImageContextCacheKeyFilter];
+    }
+    if (cacheKeyFilter) {
+        key = [cacheKeyFilter cacheKeyForURL:url];
+    } else {
+        key = url.absoluteString;
+    }
+    
+    return key;
+}
+
+- (nullable NSString *)cacheKeyForURL:(nullable NSURL *)url context:(nullable SDWebImageContext *)context {
+    if (!url) {
+        return @"";
+    }
+    
+    NSString *key;
+    // Cache Key Filter
+    id<SDWebImageCacheKeyFilter> cacheKeyFilter = self.cacheKeyFilter;
+    if (context[SDWebImageContextCacheKeyFilter]) {
+        cacheKeyFilter = context[SDWebImageContextCacheKeyFilter];
+    }
+    if (cacheKeyFilter) {
+        key = [cacheKeyFilter cacheKeyForURL:url];
+    } else {
+        key = url.absoluteString;
+    }
+    
+    // Thumbnail Key Appending
+    NSValue *thumbnailSizeValue = context[SDWebImageContextImageThumbnailPixelSize];
+    if (thumbnailSizeValue != nil) {
+        CGSize thumbnailSize = CGSizeZero;
+#if SD_MAC
+        thumbnailSize = thumbnailSizeValue.sizeValue;
+#else
+        thumbnailSize = thumbnailSizeValue.CGSizeValue;
+#endif
+        BOOL preserveAspectRatio = YES;
+        NSNumber *preserveAspectRatioValue = context[SDWebImageContextImagePreserveAspectRatio];
+        if (preserveAspectRatioValue != nil) {
+            preserveAspectRatio = preserveAspectRatioValue.boolValue;
+        }
+        key = SDThumbnailedKeyForKey(key, thumbnailSize, preserveAspectRatio);
+    }
+    
+    // Transformer Key Appending
+    id<SDImageTransformer> transformer = self.transformer;
+    if (context[SDWebImageContextImageTransformer]) {
+        transformer = context[SDWebImageContextImageTransformer];
+        if ([transformer isEqual:NSNull.null]) {
+            transformer = nil;
+        }
+    }
+    if (transformer) {
+        key = SDTransformedKeyForKey(key, transformer.transformerKey);
+    }
+    
+    return key;
+}
+
+- (SDWebImageCombinedOperation *)loadImageWithURL:(NSURL *)url options:(SDWebImageOptions)options progress:(SDImageLoaderProgressBlock)progressBlock completed:(SDInternalCompletionBlock)completedBlock {
+    return [self loadImageWithURL:url options:options context:nil progress:progressBlock completed:completedBlock];
+}
+
+- (SDWebImageCombinedOperation *)loadImageWithURL:(nullable NSURL *)url
+                                          options:(SDWebImageOptions)options
+                                          context:(nullable SDWebImageContext *)context
+                                         progress:(nullable SDImageLoaderProgressBlock)progressBlock
+                                        completed:(nonnull SDInternalCompletionBlock)completedBlock {
+    // Invoking this method without a completedBlock is pointless
+    NSAssert(completedBlock != nil, @"If you mean to prefetch the image, use -[SDWebImagePrefetcher prefetchURLs] instead");
+
+    // Very common mistake is to send the URL using NSString object instead of NSURL. For some strange reason, Xcode won't
+    // throw any warning for this type mismatch. Here we failsafe this error by allowing URLs to be passed as NSString.
+    if ([url isKindOfClass:NSString.class]) {
+        url = [NSURL URLWithString:(NSString *)url];
+    }
+
+    // Prevents app crashing on argument type error like sending NSNull instead of NSURL
+    if (![url isKindOfClass:NSURL.class]) {
+        url = nil;
+    }
+
+    SDWebImageCombinedOperation *operation = [SDWebImageCombinedOperation new];
+    operation.manager = self;
+
+    BOOL isFailedUrl = NO;
+    if (url) {
+        SD_LOCK(_failedURLsLock);
+        isFailedUrl = [self.failedURLs containsObject:url];
+        SD_UNLOCK(_failedURLsLock);
+    }
+    
+    // Preprocess the options and context arg to decide the final the result for manager
+    SDWebImageOptionsResult *result = [self processedResultForURL:url options:options context:context];
+
+    if (url.absoluteString.length == 0 || (!(result.options & SDWebImageRetryFailed) && isFailedUrl)) {
+        NSString *description = isFailedUrl ? @"Image url is blacklisted" : @"Image url is nil";
+        NSInteger code = isFailedUrl ? SDWebImageErrorBlackListed : SDWebImageErrorInvalidURL;
+        [self callCompletionBlockForOperation:operation completion:completedBlock error:[NSError errorWithDomain:SDWebImageErrorDomain code:code userInfo:@{NSLocalizedDescriptionKey : description}] queue:result.context[SDWebImageContextCallbackQueue] url:url];
+        return operation;
+    }
+
+    SD_LOCK(_runningOperationsLock);
+    [self.runningOperations addObject:operation];
+    SD_UNLOCK(_runningOperationsLock);
+    
+    // Start the entry to load image from cache, the longest steps are below
+    // Steps without transformer:
+    // 1. query image from cache, miss
+    // 2. download data and image
+    // 3. store image to cache
+    
+    // Steps with transformer:
+    // 1. query transformed image from cache, miss
+    // 2. query original image from cache, miss
+    // 3. download data and image
+    // 4. do transform in CPU
+    // 5. store original image to cache
+    // 6. store transformed image to cache
+    [self callCacheProcessForOperation:operation url:url options:result.options context:result.context progress:progressBlock completed:completedBlock];
+
+    return operation;
+}
+
+- (void)cancelAll {
+    SD_LOCK(_runningOperationsLock);
+    NSSet<SDWebImageCombinedOperation *> *copiedOperations = [self.runningOperations copy];
+    SD_UNLOCK(_runningOperationsLock);
+    [copiedOperations makeObjectsPerformSelector:@selector(cancel)]; // This will call `safelyRemoveOperationFromRunning:` and remove from the array
+}
+
+- (BOOL)isRunning {
+    BOOL isRunning = NO;
+    SD_LOCK(_runningOperationsLock);
+    isRunning = (self.runningOperations.count > 0);
+    SD_UNLOCK(_runningOperationsLock);
+    return isRunning;
+}
+
+- (void)removeFailedURL:(NSURL *)url {
+    if (!url) {
+        return;
+    }
+    SD_LOCK(_failedURLsLock);
+    [self.failedURLs removeObject:url];
+    SD_UNLOCK(_failedURLsLock);
+}
+
+- (void)removeAllFailedURLs {
+    SD_LOCK(_failedURLsLock);
+    [self.failedURLs removeAllObjects];
+    SD_UNLOCK(_failedURLsLock);
+}
+
+#pragma mark - Private
+
+// Query normal cache process
+- (void)callCacheProcessForOperation:(nonnull SDWebImageCombinedOperation *)operation
+                                 url:(nonnull NSURL *)url
+                             options:(SDWebImageOptions)options
+                             context:(nullable SDWebImageContext *)context
+                            progress:(nullable SDImageLoaderProgressBlock)progressBlock
+                           completed:(nullable SDInternalCompletionBlock)completedBlock {
+    // Grab the image cache to use
+    id<SDImageCache> imageCache = context[SDWebImageContextImageCache];
+    if (!imageCache) {
+        imageCache = self.imageCache;
+    }
+    // Get the query cache type
+    SDImageCacheType queryCacheType = SDImageCacheTypeAll;
+    if (context[SDWebImageContextQueryCacheType]) {
+        queryCacheType = [context[SDWebImageContextQueryCacheType] integerValue];
+    }
+    
+    // Check whether we should query cache
+    BOOL shouldQueryCache = !SD_OPTIONS_CONTAINS(options, SDWebImageFromLoaderOnly);
+    if (shouldQueryCache) {
+        // maybe thumbnail/transformed cache key
+        NSString *key = [self cacheKeyForURL:url context:context];
+        @weakify(operation);
+        id<SDWebImageOperation> cacheOperation = [imageCache queryImageForKey:key options:options context:context cacheType:queryCacheType completion:^(UIImage * _Nullable cachedImage, NSData * _Nullable cachedData, SDImageCacheType cacheType) {
+            @strongify(operation);
+            if (!operation || operation.isCancelled) {
+                // Image combined operation cancelled by user
+                [self callCompletionBlockForOperation:operation completion:completedBlock error:[NSError errorWithDomain:SDWebImageErrorDomain code:SDWebImageErrorCancelled userInfo:@{NSLocalizedDescriptionKey : @"Operation cancelled by user during querying the cache"}] queue:context[SDWebImageContextCallbackQueue] url:url];
+                [self safelyRemoveOperationFromRunning:operation];
+                return;
+            } else if (!cachedImage) {
+                NSString *originKey = [self originalCacheKeyForURL:url context:context];
+                BOOL mayInOriginalCache = ![key isEqualToString:originKey];
+                // Have a chance to query original cache instead of downloading, then applying transform
+                // Thumbnail decoding is done inside SDImageCache's decoding part, which does not need post processing for transform
+                if (mayInOriginalCache) {
+                    [self callOriginalCacheProcessForOperation:operation url:url options:options context:context progress:progressBlock completed:completedBlock];
+                    return;
+                }
+            } else {
+                // Write back the disk image into memory cache, with the correct key
+                if (cacheType == SDImageCacheTypeDisk) {
+                    // Sync
+                    [imageCache storeImage:cachedImage imageData:nil forKey:key cacheType:SDImageCacheTypeMemory completion:nil];
+                }
+            }
+            // Continue download process
+            [self callDownloadProcessForOperation:operation url:url options:options context:context cachedImage:cachedImage cachedData:cachedData cacheType:cacheType progress:progressBlock completed:completedBlock];
+        }];
+        @synchronized (operation) {
+            operation.cacheOperation = cacheOperation;
+        }
+    } else {
+        // Continue download process
+        [self callDownloadProcessForOperation:operation url:url options:options context:context cachedImage:nil cachedData:nil cacheType:SDImageCacheTypeNone progress:progressBlock completed:completedBlock];
+    }
+}
+
+// Query original cache process
+- (void)callOriginalCacheProcessForOperation:(nonnull SDWebImageCombinedOperation *)operation
+                                         url:(nonnull NSURL *)url
+                                     options:(SDWebImageOptions)options
+                                     context:(nullable SDWebImageContext *)context
+                                    progress:(nullable SDImageLoaderProgressBlock)progressBlock
+                                   completed:(nullable SDInternalCompletionBlock)completedBlock {
+    // Grab the image cache to use, choose standalone original cache firstly
+    id<SDImageCache> imageCache = context[SDWebImageContextOriginalImageCache];
+    if (!imageCache) {
+        // if no standalone cache available, use default cache
+        imageCache = context[SDWebImageContextImageCache];
+        if (!imageCache) {
+            imageCache = self.imageCache;
+        }
+    }
+    // Get the original query cache type
+    SDImageCacheType originalQueryCacheType = SDImageCacheTypeDisk;
+    if (context[SDWebImageContextOriginalQueryCacheType]) {
+        originalQueryCacheType = [context[SDWebImageContextOriginalQueryCacheType] integerValue];
+    }
+    
+    // Check whether we should query original cache
+    BOOL shouldQueryOriginalCache = (originalQueryCacheType != SDImageCacheTypeNone);
+    if (shouldQueryOriginalCache) {
+        // Get original cache key generation without transformer
+        NSString *key = [self originalCacheKeyForURL:url context:context];
+        @weakify(operation);
+        id<SDWebImageOperation> cacheOperation = [imageCache queryImageForKey:key options:options context:context cacheType:originalQueryCacheType completion:^(UIImage * _Nullable cachedImage, NSData * _Nullable cachedData, SDImageCacheType cacheType) {
+            @strongify(operation);
+            if (!operation || operation.isCancelled) {
+                // Image combined operation cancelled by user
+                [self callCompletionBlockForOperation:operation completion:completedBlock error:[NSError errorWithDomain:SDWebImageErrorDomain code:SDWebImageErrorCancelled userInfo:@{NSLocalizedDescriptionKey : @"Operation cancelled by user during querying the cache"}] queue:context[SDWebImageContextCallbackQueue] url:url];
+                [self safelyRemoveOperationFromRunning:operation];
+                return;
+            } else if (!cachedImage) {
+                // Original image cache miss. Continue download process
+                [self callDownloadProcessForOperation:operation url:url options:options context:context cachedImage:nil cachedData:nil cacheType:SDImageCacheTypeNone progress:progressBlock completed:completedBlock];
+                return;
+            } else {
+                // Write back the disk image into memory cache, with the correct key
+                if (cacheType == SDImageCacheTypeDisk) {
+                    // Sync
+                    [imageCache storeImage:cachedImage imageData:nil forKey:key cacheType:SDImageCacheTypeMemory completion:nil];
+                }
+            }
+                        
+            // Skip downloading and continue transform process, and ignore .refreshCached option for now
+            [self callTransformProcessForOperation:operation url:url options:options context:context originalImage:cachedImage originalData:cachedData cacheType:cacheType finished:YES completed:completedBlock];
+            
+            [self safelyRemoveOperationFromRunning:operation];
+        }];
+        @synchronized (operation) {
+            operation.cacheOperation = cacheOperation;
+        }
+    } else {
+        // Continue download process
+        [self callDownloadProcessForOperation:operation url:url options:options context:context cachedImage:nil cachedData:nil cacheType:SDImageCacheTypeNone progress:progressBlock completed:completedBlock];
+    }
+}
+
+// Download process
+- (void)callDownloadProcessForOperation:(nonnull SDWebImageCombinedOperation *)operation
+                                    url:(nonnull NSURL *)url
+                                options:(SDWebImageOptions)options
+                                context:(SDWebImageContext *)context
+                            cachedImage:(nullable UIImage *)cachedImage
+                             cachedData:(nullable NSData *)cachedData
+                              cacheType:(SDImageCacheType)cacheType
+                               progress:(nullable SDImageLoaderProgressBlock)progressBlock
+                              completed:(nullable SDInternalCompletionBlock)completedBlock {
+    // Mark the cache operation end
+    @synchronized (operation) {
+        operation.cacheOperation = nil;
+    }
+    
+    // Grab the image loader to use
+    id<SDImageLoader> imageLoader = context[SDWebImageContextImageLoader];
+    if (!imageLoader) {
+        imageLoader = self.imageLoader;
+    }
+    
+    // Check whether we should download image from network
+    BOOL shouldDownload = !SD_OPTIONS_CONTAINS(options, SDWebImageFromCacheOnly);
+    shouldDownload &= (!cachedImage || options & SDWebImageRefreshCached);
+    shouldDownload &= (![self.delegate respondsToSelector:@selector(imageManager:shouldDownloadImageForURL:)] || [self.delegate imageManager:self shouldDownloadImageForURL:url]);
+    if ([imageLoader respondsToSelector:@selector(canRequestImageForURL:options:context:)]) {
+        shouldDownload &= [imageLoader canRequestImageForURL:url options:options context:context];
+    } else {
+        shouldDownload &= [imageLoader canRequestImageForURL:url];
+    }
+    if (shouldDownload) {
+        if (cachedImage && options & SDWebImageRefreshCached) {
+            // If image was found in the cache but SDWebImageRefreshCached is provided, notify about the cached image
+            // AND try to re-download it in order to let a chance to NSURLCache to refresh it from server.
+            [self callCompletionBlockForOperation:operation completion:completedBlock image:cachedImage data:cachedData error:nil cacheType:cacheType finished:YES queue:context[SDWebImageContextCallbackQueue] url:url];
+            // Pass the cached image to the image loader. The image loader should check whether the remote image is equal to the cached image.
+            SDWebImageMutableContext *mutableContext;
+            if (context) {
+                mutableContext = [context mutableCopy];
+            } else {
+                mutableContext = [NSMutableDictionary dictionary];
+            }
+            mutableContext[SDWebImageContextLoaderCachedImage] = cachedImage;
+            context = [mutableContext copy];
+        }
+        
+        @weakify(operation);
+        id<SDWebImageOperation> loaderOperation = [imageLoader requestImageWithURL:url options:options context:context progress:progressBlock completed:^(UIImage *downloadedImage, NSData *downloadedData, NSError *error, BOOL finished) {
+            @strongify(operation);
+            if (!operation || operation.isCancelled) {
+                // Image combined operation cancelled by user
+                [self callCompletionBlockForOperation:operation completion:completedBlock error:[NSError errorWithDomain:SDWebImageErrorDomain code:SDWebImageErrorCancelled userInfo:@{NSLocalizedDescriptionKey : @"Operation cancelled by user during sending the request"}] queue:context[SDWebImageContextCallbackQueue] url:url];
+            } else if (cachedImage && options & SDWebImageRefreshCached && [error.domain isEqualToString:SDWebImageErrorDomain] && error.code == SDWebImageErrorCacheNotModified) {
+                // Image refresh hit the NSURLCache cache, do not call the completion block
+            } else if ([error.domain isEqualToString:SDWebImageErrorDomain] && error.code == SDWebImageErrorCancelled) {
+                // Download operation cancelled by user before sending the request, don't block failed URL
+                [self callCompletionBlockForOperation:operation completion:completedBlock error:error queue:context[SDWebImageContextCallbackQueue] url:url];
+            } else if (error) {
+                [self callCompletionBlockForOperation:operation completion:completedBlock error:error queue:context[SDWebImageContextCallbackQueue] url:url];
+                BOOL shouldBlockFailedURL = [self shouldBlockFailedURLWithURL:url error:error options:options context:context];
+                
+                if (shouldBlockFailedURL) {
+                    SD_LOCK(self->_failedURLsLock);
+                    [self.failedURLs addObject:url];
+                    SD_UNLOCK(self->_failedURLsLock);
+                }
+            } else {
+                if ((options & SDWebImageRetryFailed)) {
+                    SD_LOCK(self->_failedURLsLock);
+                    [self.failedURLs removeObject:url];
+                    SD_UNLOCK(self->_failedURLsLock);
+                }
+                // Continue transform process
+                [self callTransformProcessForOperation:operation url:url options:options context:context originalImage:downloadedImage originalData:downloadedData cacheType:SDImageCacheTypeNone finished:finished completed:completedBlock];
+            }
+            
+            if (finished) {
+                [self safelyRemoveOperationFromRunning:operation];
+            }
+        }];
+        @synchronized (operation) {
+            operation.loaderOperation = loaderOperation;
+        }
+    } else if (cachedImage) {
+        [self callCompletionBlockForOperation:operation completion:completedBlock image:cachedImage data:cachedData error:nil cacheType:cacheType finished:YES queue:context[SDWebImageContextCallbackQueue] url:url];
+        [self safelyRemoveOperationFromRunning:operation];
+    } else {
+        // Image not in cache and download disallowed by delegate
+        [self callCompletionBlockForOperation:operation completion:completedBlock image:nil data:nil error:nil cacheType:SDImageCacheTypeNone finished:YES queue:context[SDWebImageContextCallbackQueue] url:url];
+        [self safelyRemoveOperationFromRunning:operation];
+    }
+}
+
+// Transform process
+- (void)callTransformProcessForOperation:(nonnull SDWebImageCombinedOperation *)operation
+                                     url:(nonnull NSURL *)url
+                                 options:(SDWebImageOptions)options
+                                 context:(SDWebImageContext *)context
+                           originalImage:(nullable UIImage *)originalImage
+                            originalData:(nullable NSData *)originalData
+                               cacheType:(SDImageCacheType)cacheType
+                                finished:(BOOL)finished
+                               completed:(nullable SDInternalCompletionBlock)completedBlock {
+    id<SDImageTransformer> transformer = context[SDWebImageContextImageTransformer];
+    if ([transformer isEqual:NSNull.null]) {
+        transformer = nil;
+    }
+    // transformer check
+    BOOL shouldTransformImage = originalImage && transformer;
+    shouldTransformImage = shouldTransformImage && (!originalImage.sd_isAnimated || (options & SDWebImageTransformAnimatedImage));
+    shouldTransformImage = shouldTransformImage && (!originalImage.sd_isVector || (options & SDWebImageTransformVectorImage));
+    // thumbnail check
+    BOOL isThumbnail = originalImage.sd_isThumbnail;
+    NSData *cacheData = originalData;
+    UIImage *cacheImage = originalImage;
+    if (isThumbnail) {
+        cacheData = nil; // thumbnail don't store full size data
+        originalImage = nil; // thumbnail don't have full size image
+    }
+    
+    if (shouldTransformImage) {
+        // transformed cache key
+        NSString *key = [self cacheKeyForURL:url context:context];
+        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
+            // Case that transformer on thumbnail, which this time need full pixel image
+            UIImage *transformedImage = [transformer transformedImageWithImage:cacheImage forKey:key];
+            if (transformedImage) {
+                // We need keep some metadata from the full size image when needed
+                // Because most of our transformer does not care about these information
+                // So we add a **post-process** logic here, not a good design :(
+                BOOL preserveImageMetadata = YES;
+                if ([transformer respondsToSelector:@selector(preserveImageMetadata)]) {
+                    preserveImageMetadata = transformer.preserveImageMetadata;
+                }
+                if (preserveImageMetadata) {
+                    SDImageCopyAssociatedObject(cacheImage, transformedImage);
+                }
+                // Mark the transformed
+                transformedImage.sd_isTransformed = YES;
+                [self callStoreOriginCacheProcessForOperation:operation url:url options:options context:context originalImage:originalImage cacheImage:transformedImage originalData:originalData cacheData:nil cacheType:cacheType finished:finished completed:completedBlock];
+            } else {
+                [self callStoreOriginCacheProcessForOperation:operation url:url options:options context:context originalImage:originalImage cacheImage:cacheImage originalData:originalData cacheData:cacheData cacheType:cacheType finished:finished completed:completedBlock];
+            }
+        });
+    } else {
+        [self callStoreOriginCacheProcessForOperation:operation url:url options:options context:context originalImage:originalImage cacheImage:cacheImage originalData:originalData cacheData:cacheData cacheType:cacheType finished:finished completed:completedBlock];
+    }
+}
+
+// Store origin cache process
+- (void)callStoreOriginCacheProcessForOperation:(nonnull SDWebImageCombinedOperation *)operation
+                                            url:(nonnull NSURL *)url
+                                        options:(SDWebImageOptions)options
+                                        context:(SDWebImageContext *)context
+                                  originalImage:(nullable UIImage *)originalImage
+                                     cacheImage:(nullable UIImage *)cacheImage
+                                   originalData:(nullable NSData *)originalData
+                                      cacheData:(nullable NSData *)cacheData
+                                      cacheType:(SDImageCacheType)cacheType
+                                       finished:(BOOL)finished
+                                      completed:(nullable SDInternalCompletionBlock)completedBlock {
+    // Grab the image cache to use, choose standalone original cache firstly
+    id<SDImageCache> imageCache = context[SDWebImageContextOriginalImageCache];
+    if (!imageCache) {
+        // if no standalone cache available, use default cache
+        imageCache = context[SDWebImageContextImageCache];
+        if (!imageCache) {
+            imageCache = self.imageCache;
+        }
+    }
+    // the original store image cache type
+    SDImageCacheType originalStoreCacheType = SDImageCacheTypeDisk;
+    if (context[SDWebImageContextOriginalStoreCacheType]) {
+        originalStoreCacheType = [context[SDWebImageContextOriginalStoreCacheType] integerValue];
+    }
+    id<SDWebImageCacheSerializer> cacheSerializer = context[SDWebImageContextCacheSerializer];
+    
+    // If the original cacheType is disk, since we don't need to store the original data again
+    // Strip the disk from the originalStoreCacheType
+    if (cacheType == SDImageCacheTypeDisk) {
+        if (originalStoreCacheType == SDImageCacheTypeDisk) originalStoreCacheType = SDImageCacheTypeNone;
+        if (originalStoreCacheType == SDImageCacheTypeAll) originalStoreCacheType = SDImageCacheTypeMemory;
+    }
+    
+    // Get original cache key generation without transformer
+    NSString *key = [self originalCacheKeyForURL:url context:context];
+    if (finished && cacheSerializer && (originalStoreCacheType == SDImageCacheTypeDisk || originalStoreCacheType == SDImageCacheTypeAll)) {
+        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
+            NSData *newOriginalData = [cacheSerializer cacheDataWithImage:originalImage originalData:originalData imageURL:url];
+            // Store original image and data
+            [self storeImage:originalImage imageData:newOriginalData forKey:key options:options context:context imageCache:imageCache cacheType:originalStoreCacheType finished:finished completion:^{
+                // Continue store cache process, transformed data is nil
+                [self callStoreCacheProcessForOperation:operation url:url options:options context:context image:cacheImage data:cacheData cacheType:cacheType finished:finished completed:completedBlock];
+            }];
+        });
+    } else {
+        // Store original image and data
+        [self storeImage:originalImage imageData:originalData forKey:key options:options context:context imageCache:imageCache cacheType:originalStoreCacheType finished:finished completion:^{
+            // Continue store cache process, transformed data is nil
+            [self callStoreCacheProcessForOperation:operation url:url options:options context:context image:cacheImage data:cacheData cacheType:cacheType finished:finished completed:completedBlock];
+        }];
+    }
+}
+
+// Store normal cache process
+- (void)callStoreCacheProcessForOperation:(nonnull SDWebImageCombinedOperation *)operation
+                                      url:(nonnull NSURL *)url
+                                  options:(SDWebImageOptions)options
+                                  context:(SDWebImageContext *)context
+                                    image:(nullable UIImage *)image
+                                     data:(nullable NSData *)data
+                                cacheType:(SDImageCacheType)cacheType
+                                 finished:(BOOL)finished
+                                completed:(nullable SDInternalCompletionBlock)completedBlock {
+    // Grab the image cache to use
+    id<SDImageCache> imageCache = context[SDWebImageContextImageCache];
+    if (!imageCache) {
+        imageCache = self.imageCache;
+    }
+    // the target image store cache type
+    SDImageCacheType storeCacheType = SDImageCacheTypeAll;
+    if (context[SDWebImageContextStoreCacheType]) {
+        storeCacheType = [context[SDWebImageContextStoreCacheType] integerValue];
+    }
+    id<SDWebImageCacheSerializer> cacheSerializer = context[SDWebImageContextCacheSerializer];
+    
+    // transformed cache key
+    NSString *key = [self cacheKeyForURL:url context:context];
+    if (finished && cacheSerializer && (storeCacheType == SDImageCacheTypeDisk || storeCacheType == SDImageCacheTypeAll)) {
+        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
+            NSData *newData = [cacheSerializer cacheDataWithImage:image originalData:data imageURL:url];
+            // Store image and data
+            [self storeImage:image imageData:newData forKey:key options:options context:context imageCache:imageCache cacheType:storeCacheType finished:finished completion:^{
+                [self callCompletionBlockForOperation:operation completion:completedBlock image:image data:data error:nil cacheType:cacheType finished:finished queue:context[SDWebImageContextCallbackQueue] url:url];
+            }];
+        });
+    } else {
+        // Store image and data
+        [self storeImage:image imageData:data forKey:key options:options context:context imageCache:imageCache cacheType:storeCacheType finished:finished completion:^{
+            [self callCompletionBlockForOperation:operation completion:completedBlock image:image data:data error:nil cacheType:cacheType finished:finished queue:context[SDWebImageContextCallbackQueue] url:url];
+        }];
+    }
+}
+
+#pragma mark - Helper
+
+- (void)safelyRemoveOperationFromRunning:(nullable SDWebImageCombinedOperation*)operation {
+    if (!operation) {
+        return;
+    }
+    SD_LOCK(_runningOperationsLock);
+    [self.runningOperations removeObject:operation];
+    SD_UNLOCK(_runningOperationsLock);
+}
+
+- (void)storeImage:(nullable UIImage *)image
+         imageData:(nullable NSData *)data
+            forKey:(nullable NSString *)key
+           options:(SDWebImageOptions)options
+           context:(nullable SDWebImageContext *)context
+        imageCache:(nonnull id<SDImageCache>)imageCache
+         cacheType:(SDImageCacheType)cacheType
+          finished:(BOOL)finished
+        completion:(nullable SDWebImageNoParamsBlock)completion {
+    BOOL waitStoreCache = SD_OPTIONS_CONTAINS(options, SDWebImageWaitStoreCache);
+    // Ignore progressive data cache
+    if (!finished) {
+        if (completion) {
+            completion();
+        }
+        return;
+    }
+    // Check whether we should wait the store cache finished. If not, callback immediately
+    if ([imageCache respondsToSelector:@selector(storeImage:imageData:forKey:options:context:cacheType:completion:)]) {
+        [imageCache storeImage:image imageData:data forKey:key options:options context:context cacheType:cacheType completion:^{
+            if (waitStoreCache) {
+                if (completion) {
+                    completion();
+                }
+            }
+        }];
+    } else {
+        [imageCache storeImage:image imageData:data forKey:key cacheType:cacheType completion:^{
+            if (waitStoreCache) {
+                if (completion) {
+                    completion();
+                }
+            }
+        }];
+    }
+    if (!waitStoreCache) {
+        if (completion) {
+            completion();
+        }
+    }
+}
+
+- (void)callCompletionBlockForOperation:(nullable SDWebImageCombinedOperation*)operation
+                             completion:(nullable SDInternalCompletionBlock)completionBlock
+                                  error:(nullable NSError *)error
+                                  queue:(nullable SDCallbackQueue *)queue
+                                    url:(nullable NSURL *)url {
+    [self callCompletionBlockForOperation:operation completion:completionBlock image:nil data:nil error:error cacheType:SDImageCacheTypeNone finished:YES queue:queue url:url];
+}
+
+- (void)callCompletionBlockForOperation:(nullable SDWebImageCombinedOperation*)operation
+                             completion:(nullable SDInternalCompletionBlock)completionBlock
+                                  image:(nullable UIImage *)image
+                                   data:(nullable NSData *)data
+                                  error:(nullable NSError *)error
+                              cacheType:(SDImageCacheType)cacheType
+                               finished:(BOOL)finished
+                                  queue:(nullable SDCallbackQueue *)queue
+                                    url:(nullable NSURL *)url {
+    if (completionBlock) {
+        [(queue ?: SDCallbackQueue.mainQueue) async:^{
+            completionBlock(image, data, error, cacheType, finished, url);
+        }];
+    }
+}
+
+- (BOOL)shouldBlockFailedURLWithURL:(nonnull NSURL *)url
+                              error:(nonnull NSError *)error
+                            options:(SDWebImageOptions)options
+                            context:(nullable SDWebImageContext *)context {
+    id<SDImageLoader> imageLoader = context[SDWebImageContextImageLoader];
+    if (!imageLoader) {
+        imageLoader = self.imageLoader;
+    }
+    // Check whether we should block failed url
+    BOOL shouldBlockFailedURL;
+    if ([self.delegate respondsToSelector:@selector(imageManager:shouldBlockFailedURL:withError:)]) {
+        shouldBlockFailedURL = [self.delegate imageManager:self shouldBlockFailedURL:url withError:error];
+    } else {
+        if ([imageLoader respondsToSelector:@selector(shouldBlockFailedURLWithURL:error:options:context:)]) {
+            shouldBlockFailedURL = [imageLoader shouldBlockFailedURLWithURL:url error:error options:options context:context];
+        } else {
+            shouldBlockFailedURL = [imageLoader shouldBlockFailedURLWithURL:url error:error];
+        }
+    }
+    
+    return shouldBlockFailedURL;
+}
+
+- (SDWebImageOptionsResult *)processedResultForURL:(NSURL *)url options:(SDWebImageOptions)options context:(SDWebImageContext *)context {
+    SDWebImageOptionsResult *result;
+    SDWebImageMutableContext *mutableContext = [SDWebImageMutableContext dictionary];
+    
+    // Image Transformer from manager
+    if (!context[SDWebImageContextImageTransformer]) {
+        id<SDImageTransformer> transformer = self.transformer;
+        [mutableContext setValue:transformer forKey:SDWebImageContextImageTransformer];
+    }
+    // Cache key filter from manager
+    if (!context[SDWebImageContextCacheKeyFilter]) {
+        id<SDWebImageCacheKeyFilter> cacheKeyFilter = self.cacheKeyFilter;
+        [mutableContext setValue:cacheKeyFilter forKey:SDWebImageContextCacheKeyFilter];
+    }
+    // Cache serializer from manager
+    if (!context[SDWebImageContextCacheSerializer]) {
+        id<SDWebImageCacheSerializer> cacheSerializer = self.cacheSerializer;
+        [mutableContext setValue:cacheSerializer forKey:SDWebImageContextCacheSerializer];
+    }
+    
+    if (mutableContext.count > 0) {
+        if (context) {
+            [mutableContext addEntriesFromDictionary:context];
+        }
+        context = [mutableContext copy];
+    }
+    
+    // Apply options processor
+    if (self.optionsProcessor) {
+        result = [self.optionsProcessor processedResultForURL:url options:options context:context];
+    }
+    if (!result) {
+        // Use default options result
+        result = [[SDWebImageOptionsResult alloc] initWithOptions:options context:context];
+    }
+    
+    return result;
+}
+
+@end
+
+
+@implementation SDWebImageCombinedOperation
+
+- (BOOL)isCancelled {
+    // Need recursive lock (user's cancel block may check isCancelled), do not use SD_LOCK
+    @synchronized (self) {
+        return _cancelled;
+    }
+}
+
+- (void)cancel {
+    // Need recursive lock (user's cancel block may check isCancelled), do not use SD_LOCK
+    @synchronized(self) {
+        if (_cancelled) {
+            return;
+        }
+        _cancelled = YES;
+        if (self.cacheOperation) {
+            [self.cacheOperation cancel];
+            self.cacheOperation = nil;
+        }
+        if (self.loaderOperation) {
+            [self.loaderOperation cancel];
+            self.loaderOperation = nil;
+        }
+        [self.manager safelyRemoveOperationFromRunning:self];
+    }
+}
+
+@end
diff --git a/SDWebImage/Core/SDWebImageOperation.h b/SDWebImage/Core/SDWebImageOperation.h
new file mode 100644
index 000000000..bc4224f4b
--- /dev/null
+++ b/SDWebImage/Core/SDWebImageOperation.h
@@ -0,0 +1,27 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+
+/// A protocol represents cancelable operation.
+@protocol SDWebImageOperation <NSObject>
+
+/// Cancel the operation
+- (void)cancel;
+
+@optional
+
+/// Whether the operation has been cancelled.
+@property (nonatomic, assign, readonly, getter=isCancelled) BOOL cancelled;
+
+@end
+
+/// NSOperation conform to `SDWebImageOperation`.
+@interface NSOperation (SDWebImageOperation) <SDWebImageOperation>
+
+@end
diff --git a/SDWebImage/Core/SDWebImageOperation.m b/SDWebImage/Core/SDWebImageOperation.m
new file mode 100644
index 000000000..0d6e880de
--- /dev/null
+++ b/SDWebImage/Core/SDWebImageOperation.m
@@ -0,0 +1,14 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageOperation.h"
+
+/// NSOperation conform to `SDWebImageOperation`.
+@implementation NSOperation (SDWebImageOperation)
+
+@end
diff --git a/SDWebImage/Core/SDWebImageOptionsProcessor.h b/SDWebImage/Core/SDWebImageOptionsProcessor.h
new file mode 100644
index 000000000..361dfed87
--- /dev/null
+++ b/SDWebImage/Core/SDWebImageOptionsProcessor.h
@@ -0,0 +1,78 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCompat.h"
+#import "SDWebImageDefine.h"
+
+@class SDWebImageOptionsResult;
+
+typedef SDWebImageOptionsResult * _Nullable(^SDWebImageOptionsProcessorBlock)(NSURL * _Nullable url, SDWebImageOptions options, SDWebImageContext * _Nullable context);
+
+/**
+ The options result contains both options and context.
+ */
+@interface SDWebImageOptionsResult : NSObject
+
+/**
+ WebCache options.
+ */
+@property (nonatomic, assign, readonly) SDWebImageOptions options;
+
+/**
+ Context options.
+ */
+@property (nonatomic, copy, readonly, nullable) SDWebImageContext *context;
+
+/**
+ Create a new options result.
+
+ @param options options
+ @param context context
+ @return The options result contains both options and context.
+ */
+- (nonnull instancetype)initWithOptions:(SDWebImageOptions)options context:(nullable SDWebImageContext *)context;
+
+- (nonnull instancetype)init NS_UNAVAILABLE;
++ (nonnull instancetype)new  NS_UNAVAILABLE;
+
+@end
+
+/**
+ This is the protocol for options processor.
+ Options processor can be used, to control the final result for individual image request's `SDWebImageOptions` and `SDWebImageContext`
+ Implements the protocol to have a global control for each indivadual image request's option.
+ */
+@protocol SDWebImageOptionsProcessor <NSObject>
+
+/**
+ Return the processed options result for specify image URL, with its options and context
+
+ @param url The URL to the image
+ @param options A mask to specify options to use for this request
+ @param context A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
+ @return The processed result, contains both options and context
+ */
+- (nullable SDWebImageOptionsResult *)processedResultForURL:(nullable NSURL *)url
+                                                    options:(SDWebImageOptions)options
+                                                    context:(nullable SDWebImageContext *)context;
+
+@end
+
+/**
+ A options processor class with block.
+ */
+@interface SDWebImageOptionsProcessor : NSObject<SDWebImageOptionsProcessor>
+
+- (nonnull instancetype)initWithBlock:(nonnull SDWebImageOptionsProcessorBlock)block;
++ (nonnull instancetype)optionsProcessorWithBlock:(nonnull SDWebImageOptionsProcessorBlock)block;
+
+- (nonnull instancetype)init NS_UNAVAILABLE;
++ (nonnull instancetype)new  NS_UNAVAILABLE;
+
+@end
diff --git a/SDWebImage/Core/SDWebImageOptionsProcessor.m b/SDWebImage/Core/SDWebImageOptionsProcessor.m
new file mode 100644
index 000000000..8e7bc35d5
--- /dev/null
+++ b/SDWebImage/Core/SDWebImageOptionsProcessor.m
@@ -0,0 +1,59 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageOptionsProcessor.h"
+
+@interface SDWebImageOptionsResult ()
+
+@property (nonatomic, assign) SDWebImageOptions options;
+@property (nonatomic, copy, nullable) SDWebImageContext *context;
+
+@end
+
+@implementation SDWebImageOptionsResult
+
+- (instancetype)initWithOptions:(SDWebImageOptions)options context:(SDWebImageContext *)context {
+    self = [super init];
+    if (self) {
+        self.options = options;
+        self.context = context;
+    }
+    return self;
+}
+
+@end
+
+@interface SDWebImageOptionsProcessor ()
+
+@property (nonatomic, copy, nonnull) SDWebImageOptionsProcessorBlock block;
+
+@end
+
+@implementation SDWebImageOptionsProcessor
+
+- (instancetype)initWithBlock:(SDWebImageOptionsProcessorBlock)block {
+    self = [super init];
+    if (self) {
+        self.block = block;
+    }
+    return self;
+}
+
++ (instancetype)optionsProcessorWithBlock:(SDWebImageOptionsProcessorBlock)block {
+    SDWebImageOptionsProcessor *optionsProcessor = [[SDWebImageOptionsProcessor alloc] initWithBlock:block];
+    return optionsProcessor;
+}
+
+- (SDWebImageOptionsResult *)processedResultForURL:(NSURL *)url options:(SDWebImageOptions)options context:(SDWebImageContext *)context {
+    if (!self.block) {
+        return nil;
+    }
+    return self.block(url, options, context);
+}
+
+@end
diff --git a/SDWebImage/Core/SDWebImagePrefetcher.h b/SDWebImage/Core/SDWebImagePrefetcher.h
new file mode 100644
index 000000000..2256cc0c6
--- /dev/null
+++ b/SDWebImage/Core/SDWebImagePrefetcher.h
@@ -0,0 +1,168 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageManager.h"
+
+@class SDWebImagePrefetcher;
+
+/**
+ A token represents a list of URLs, can be used to cancel the download.
+ */
+@interface SDWebImagePrefetchToken : NSObject <SDWebImageOperation>
+
+/**
+ * Cancel the current prefetching.
+ */
+- (void)cancel;
+
+/**
+ list of URLs of current prefetching.
+ */
+@property (nonatomic, copy, readonly, nullable) NSArray<NSURL *> *urls;
+
+@end
+
+/**
+ The prefetcher delegate protocol
+ */
+@protocol SDWebImagePrefetcherDelegate <NSObject>
+
+@optional
+
+/**
+ * Called when an image was prefetched. Which means it's called when one URL from any of prefetching finished.
+ *
+ * @param imagePrefetcher The current image prefetcher
+ * @param imageURL        The image url that was prefetched
+ * @param finishedCount   The total number of images that were prefetched (successful or not)
+ * @param totalCount      The total number of images that were to be prefetched
+ */
+- (void)imagePrefetcher:(nonnull SDWebImagePrefetcher *)imagePrefetcher didPrefetchURL:(nullable NSURL *)imageURL finishedCount:(NSUInteger)finishedCount totalCount:(NSUInteger)totalCount;
+
+/**
+ * Called when all images are prefetched. Which means it's called when all URLs from all of prefetching finished.
+ * @param imagePrefetcher The current image prefetcher
+ * @param totalCount      The total number of images that were prefetched (whether successful or not)
+ * @param skippedCount    The total number of images that were skipped
+ */
+- (void)imagePrefetcher:(nonnull SDWebImagePrefetcher *)imagePrefetcher didFinishWithTotalCount:(NSUInteger)totalCount skippedCount:(NSUInteger)skippedCount;
+
+@end
+
+typedef void(^SDWebImagePrefetcherProgressBlock)(NSUInteger noOfFinishedUrls, NSUInteger noOfTotalUrls);
+typedef void(^SDWebImagePrefetcherCompletionBlock)(NSUInteger noOfFinishedUrls, NSUInteger noOfSkippedUrls);
+
+/**
+ * Prefetch some URLs in the cache for future use. Images are downloaded in low priority.
+ */
+@interface SDWebImagePrefetcher : NSObject
+
+/**
+ * The web image manager used by prefetcher to prefetch images.
+ * @note You can specify a standalone manager and downloader with custom configuration suitable for image prefetching. Such as `currentDownloadCount` or `downloadTimeout`.
+ */
+@property (strong, nonatomic, readonly, nonnull) SDWebImageManager *manager;
+
+/**
+ * Maximum number of URLs to prefetch at the same time. Defaults to 3.
+ */
+@property (nonatomic, assign) NSUInteger maxConcurrentPrefetchCount;
+
+/**
+ * The options for prefetcher. Defaults to SDWebImageLowPriority.
+ * @deprecated Prefetcher is designed to be used shared and should not effect others. So in 5.15.0 we added API  `prefetchURLs:options:context:`. If you want global control, try to use `SDWebImageOptionsProcessor` in manager level.
+ */
+@property (nonatomic, assign) SDWebImageOptions options API_DEPRECATED("Use individual prefetch options param instead", macos(10.10, API_TO_BE_DEPRECATED), ios(8.0, API_TO_BE_DEPRECATED), tvos(9.0, API_TO_BE_DEPRECATED), watchos(2.0, API_TO_BE_DEPRECATED));
+
+/**
+ * The context for prefetcher. Defaults to nil.
+ * @deprecated Prefetcher is designed to be used shared and should not effect others. So in 5.15.0 we added API  `prefetchURLs:options:context:`. If you want global control, try to use `SDWebImageOptionsProcessor` in `SDWebImageManager.optionsProcessor`.
+ */
+@property (nonatomic, copy, nullable) SDWebImageContext *context API_DEPRECATED("Use individual prefetch context param instead", macos(10.10, API_TO_BE_DEPRECATED), ios(8.0, API_TO_BE_DEPRECATED), tvos(9.0, API_TO_BE_DEPRECATED), watchos(2.0, API_TO_BE_DEPRECATED));
+
+/**
+ * Queue options for prefetcher when call the progressBlock, completionBlock and delegate methods. Defaults to Main Queue.
+ * @deprecated 5.15.0 introduce SDCallbackQueue, use that is preferred and has higher priority. The set/get to this property will translate to that instead.
+ * @note The call is asynchronously to avoid blocking target queue. (see SDCallbackPolicyDispatch)
+ * @note The delegate queue should be set before any prefetching start and may not be changed during prefetching to avoid thread-safe problem.
+ */
+@property (strong, nonatomic, nonnull) dispatch_queue_t delegateQueue API_DEPRECATED("Use SDWebImageContextCallbackQueue context param instead, see SDCallbackQueue", macos(10.10, 10.10), ios(8.0, 8.0), tvos(9.0, 9.0), watchos(2.0, 2.0));
+
+/**
+ * The delegate for the prefetcher. Defaults to nil.
+ */
+@property (weak, nonatomic, nullable) id <SDWebImagePrefetcherDelegate> delegate;
+
+/**
+ * Returns the global shared image prefetcher instance. It use a standalone manager which is different from shared manager.
+ */
+@property (nonatomic, class, readonly, nonnull) SDWebImagePrefetcher *sharedImagePrefetcher;
+
+/**
+ * Allows you to instantiate a prefetcher with any arbitrary image manager.
+ */
+- (nonnull instancetype)initWithImageManager:(nonnull SDWebImageManager *)manager NS_DESIGNATED_INITIALIZER;
+
+/**
+ * Assign list of URLs to let SDWebImagePrefetcher to queue the prefetching. It based on the image manager so the image may from the cache and network according to the `options` property.
+ * Prefetching is separate to each other, which means the progressBlock and completionBlock you provide is bind to the prefetching for the list of urls.
+ * Attention that call this will not cancel previous fetched urls. You should keep the token return by this to cancel or cancel all the prefetch.
+ *
+ * @param urls list of URLs to prefetch
+ * @return the token to cancel the current prefetching.
+ */
+- (nullable SDWebImagePrefetchToken *)prefetchURLs:(nullable NSArray<NSURL *> *)urls;
+
+/**
+ * Assign list of URLs to let SDWebImagePrefetcher to queue the prefetching. It based on the image manager so the image may from the cache and network according to the `options` property.
+ * Prefetching is separate to each other, which means the progressBlock and completionBlock you provide is bind to the prefetching for the list of urls.
+ * Attention that call this will not cancel previous fetched urls. You should keep the token return by this to cancel or cancel all the prefetch.
+ *
+ * @param urls            list of URLs to prefetch
+ * @param progressBlock   block to be called when progress updates; 
+ *                        first parameter is the number of completed (successful or not) requests, 
+ *                        second parameter is the total number of images originally requested to be prefetched
+ * @param completionBlock block to be called when the current prefetching is completed
+ *                        first param is the number of completed (successful or not) requests,
+ *                        second parameter is the number of skipped requests
+ * @return the token to cancel the current prefetching.
+ */
+- (nullable SDWebImagePrefetchToken *)prefetchURLs:(nullable NSArray<NSURL *> *)urls
+                                          progress:(nullable SDWebImagePrefetcherProgressBlock)progressBlock
+                                         completed:(nullable SDWebImagePrefetcherCompletionBlock)completionBlock;
+
+/**
+ * Assign list of URLs to let SDWebImagePrefetcher to queue the prefetching. It based on the image manager so the image may from the cache and network according to the `options` property.
+ * Prefetching is separate to each other, which means the progressBlock and completionBlock you provide is bind to the prefetching for the list of urls.
+ * Attention that call this will not cancel previous fetched urls. You should keep the token return by this to cancel or cancel all the prefetch.
+ *
+ * @param urls            list of URLs to prefetch
+ * @param options         The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param context         A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
+ * @param progressBlock   block to be called when progress updates;
+ *                        first parameter is the number of completed (successful or not) requests,
+ *                        second parameter is the total number of images originally requested to be prefetched
+ * @param completionBlock block to be called when the current prefetching is completed
+ *                        first param is the number of completed (successful or not) requests,
+ *                        second parameter is the number of skipped requests
+ * @return the token to cancel the current prefetching.
+ */
+- (nullable SDWebImagePrefetchToken *)prefetchURLs:(nullable NSArray<NSURL *> *)urls
+                                           options:(SDWebImageOptions)options
+                                           context:(nullable SDWebImageContext *)context
+                                          progress:(nullable SDWebImagePrefetcherProgressBlock)progressBlock
+                                         completed:(nullable SDWebImagePrefetcherCompletionBlock)completionBlock;
+
+/**
+ * Remove and cancel all the prefeching for the prefetcher.
+ */
+- (void)cancelPrefetching;
+
+
+@end
diff --git a/SDWebImage/Core/SDWebImagePrefetcher.m b/SDWebImage/Core/SDWebImagePrefetcher.m
new file mode 100644
index 000000000..1a385f58c
--- /dev/null
+++ b/SDWebImage/Core/SDWebImagePrefetcher.m
@@ -0,0 +1,341 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImagePrefetcher.h"
+#import "SDAsyncBlockOperation.h"
+#import "SDCallbackQueue.h"
+#import "SDInternalMacros.h"
+#import <stdatomic.h>
+
+@interface SDCallbackQueue ()
+
+@property (nonatomic, strong, nonnull) dispatch_queue_t queue;
+
+@end
+
+@interface SDWebImagePrefetchToken () {
+    @public
+    // Though current implementation, `SDWebImageManager` completion block is always on main queue. But however, there is no guarantee in docs. And we may introduce config to specify custom queue in the future.
+    // These value are just used as incrementing counter, keep thread-safe using memory_order_relaxed for performance.
+    atomic_ulong _skippedCount;
+    atomic_ulong _finishedCount;
+    atomic_flag  _isAllFinished;
+    
+    unsigned long _totalCount;
+    
+    // Used to ensure NSPointerArray thread safe
+    SD_LOCK_DECLARE(_prefetchOperationsLock);
+    SD_LOCK_DECLARE(_loadOperationsLock);
+}
+
+@property (nonatomic, copy, readwrite) NSArray<NSURL *> *urls;
+@property (nonatomic, strong) NSPointerArray *loadOperations;
+@property (nonatomic, strong) NSPointerArray *prefetchOperations;
+@property (nonatomic, weak) SDWebImagePrefetcher *prefetcher;
+@property (nonatomic, assign) SDWebImageOptions options;
+@property (nonatomic, copy, nullable) SDWebImageContext *context;
+@property (nonatomic, copy, nullable) SDWebImagePrefetcherCompletionBlock completionBlock;
+@property (nonatomic, copy, nullable) SDWebImagePrefetcherProgressBlock progressBlock;
+
+@end
+
+@interface SDWebImagePrefetcher ()
+
+@property (strong, nonatomic, nonnull) SDWebImageManager *manager;
+@property (strong, atomic, nonnull) NSMutableSet<SDWebImagePrefetchToken *> *runningTokens;
+@property (strong, nonatomic, nonnull) NSOperationQueue *prefetchQueue;
+@property (strong, nonatomic, nullable) SDCallbackQueue *callbackQueue;
+
+@end
+
+@implementation SDWebImagePrefetcher
+
++ (nonnull instancetype)sharedImagePrefetcher {
+    static dispatch_once_t once;
+    static id instance;
+    dispatch_once(&once, ^{
+        instance = [self new];
+    });
+    return instance;
+}
+
+- (nonnull instancetype)init {
+    return [self initWithImageManager:[SDWebImageManager new]];
+}
+
+- (nonnull instancetype)initWithImageManager:(SDWebImageManager *)manager {
+    if ((self = [super init])) {
+        _manager = manager;
+        _runningTokens = [NSMutableSet set];
+        _options = SDWebImageLowPriority;
+        _prefetchQueue = [NSOperationQueue new];
+        self.maxConcurrentPrefetchCount = 3;
+    }
+    return self;
+}
+
+- (void)setMaxConcurrentPrefetchCount:(NSUInteger)maxConcurrentPrefetchCount {
+    self.prefetchQueue.maxConcurrentOperationCount = maxConcurrentPrefetchCount;
+}
+
+- (NSUInteger)maxConcurrentPrefetchCount {
+    return self.prefetchQueue.maxConcurrentOperationCount;
+}
+
+- (void)setDelegateQueue:(dispatch_queue_t)delegateQueue {
+    // Deprecate and translate to SDCallbackQueue
+    _callbackQueue = [[SDCallbackQueue alloc] initWithDispatchQueue:delegateQueue];
+    _callbackQueue.policy = SDCallbackPolicyDispatch;
+}
+
+- (dispatch_queue_t)delegateQueue {
+    // Deprecate and translate to SDCallbackQueue
+    return (_callbackQueue ?: SDCallbackQueue.mainQueue).queue;
+}
+
+#pragma mark - Prefetch
+- (nullable SDWebImagePrefetchToken *)prefetchURLs:(nullable NSArray<NSURL *> *)urls {
+    return [self prefetchURLs:urls progress:nil completed:nil];
+}
+
+- (nullable SDWebImagePrefetchToken *)prefetchURLs:(nullable NSArray<NSURL *> *)urls
+                                          progress:(nullable SDWebImagePrefetcherProgressBlock)progressBlock
+                                         completed:(nullable SDWebImagePrefetcherCompletionBlock)completionBlock {
+    return [self prefetchURLs:urls options:self.options context:self.context progress:progressBlock completed:completionBlock];
+}
+
+- (nullable SDWebImagePrefetchToken *)prefetchURLs:(nullable NSArray<NSURL *> *)urls
+                                           options:(SDWebImageOptions)options
+                                           context:(nullable SDWebImageContext *)context
+                                          progress:(nullable SDWebImagePrefetcherProgressBlock)progressBlock
+                                         completed:(nullable SDWebImagePrefetcherCompletionBlock)completionBlock {
+    if (!urls || urls.count == 0) {
+        if (completionBlock) {
+            completionBlock(0, 0);
+        }
+        return nil;
+    }
+    SDWebImagePrefetchToken *token = [SDWebImagePrefetchToken new];
+    token.prefetcher = self;
+    token.urls = urls;
+    token.options = options;
+    token.context = context;
+    token->_skippedCount = 0;
+    token->_finishedCount = 0;
+    token->_totalCount = token.urls.count;
+    atomic_flag_clear(&(token->_isAllFinished));
+    token.loadOperations = [NSPointerArray weakObjectsPointerArray];
+    token.prefetchOperations = [NSPointerArray weakObjectsPointerArray];
+    token.progressBlock = progressBlock;
+    token.completionBlock = completionBlock;
+    [self addRunningToken:token];
+    [self startPrefetchWithToken:token];
+    
+    return token;
+}
+
+- (void)startPrefetchWithToken:(SDWebImagePrefetchToken * _Nonnull)token {
+    for (NSURL *url in token.urls) {
+        @weakify(self);
+        SDAsyncBlockOperation *prefetchOperation = [SDAsyncBlockOperation blockOperationWithBlock:^(SDAsyncBlockOperation * _Nonnull asyncOperation) {
+            @strongify(self);
+            if (!self || asyncOperation.isCancelled) {
+                return;
+            }
+            id<SDWebImageOperation> operation = [self.manager loadImageWithURL:url options:token.options context:token.context progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+                @strongify(self);
+                if (!self) {
+                    return;
+                }
+                if (!finished) {
+                    return;
+                }
+                atomic_fetch_add_explicit(&(token->_finishedCount), 1, memory_order_relaxed);
+                if (error) {
+                    // Add last failed
+                    atomic_fetch_add_explicit(&(token->_skippedCount), 1, memory_order_relaxed);
+                }
+                
+                // Current operation finished
+                [self callProgressBlockForToken:token imageURL:imageURL];
+                
+                if (atomic_load_explicit(&(token->_finishedCount), memory_order_relaxed) == token->_totalCount) {
+                    // All finished
+                    if (!atomic_flag_test_and_set_explicit(&(token->_isAllFinished), memory_order_relaxed)) {
+                        [self callCompletionBlockForToken:token];
+                        [self removeRunningToken:token];
+                    }
+                }
+                [asyncOperation complete];
+            }];
+            NSAssert(operation != nil, @"Operation should not be nil, [SDWebImageManager loadImageWithURL:options:context:progress:completed:] break prefetch logic");
+            SD_LOCK(token->_loadOperationsLock);
+            [token.loadOperations addPointer:(__bridge void *)operation];
+            SD_UNLOCK(token->_loadOperationsLock);
+        }];
+        SD_LOCK(token->_prefetchOperationsLock);
+        [token.prefetchOperations addPointer:(__bridge void *)prefetchOperation];
+        SD_UNLOCK(token->_prefetchOperationsLock);
+        [self.prefetchQueue addOperation:prefetchOperation];
+    }
+}
+
+#pragma mark - Cancel
+- (void)cancelPrefetching {
+    @synchronized(self.runningTokens) {
+        NSSet<SDWebImagePrefetchToken *> *copiedTokens = [self.runningTokens copy];
+        [copiedTokens makeObjectsPerformSelector:@selector(cancel)];
+        [self.runningTokens removeAllObjects];
+    }
+}
+
+- (void)callProgressBlockForToken:(SDWebImagePrefetchToken *)token imageURL:(NSURL *)url {
+    if (!token) {
+        return;
+    }
+    BOOL shouldCallDelegate = [self.delegate respondsToSelector:@selector(imagePrefetcher:didPrefetchURL:finishedCount:totalCount:)];
+    NSUInteger tokenFinishedCount = [self tokenFinishedCount];
+    NSUInteger tokenTotalCount = [self tokenTotalCount];
+    NSUInteger finishedCount = atomic_load_explicit(&(token->_finishedCount), memory_order_relaxed);
+    NSUInteger totalCount = token->_totalCount;
+    SDCallbackQueue *queue = token.context[SDWebImageContextCallbackQueue];
+    if (!queue) {
+        queue = self.callbackQueue;
+    }
+    [(queue ?: SDCallbackQueue.mainQueue) async:^{
+        if (shouldCallDelegate) {
+            [self.delegate imagePrefetcher:self didPrefetchURL:url finishedCount:tokenFinishedCount totalCount:tokenTotalCount];
+        }
+        if (token.progressBlock) {
+            token.progressBlock(finishedCount, totalCount);
+        }
+    }];
+}
+
+- (void)callCompletionBlockForToken:(SDWebImagePrefetchToken *)token {
+    if (!token) {
+        return;
+    }
+    BOOL shoulCallDelegate = [self.delegate respondsToSelector:@selector(imagePrefetcher:didFinishWithTotalCount:skippedCount:)] && ([self countOfRunningTokens] == 1); // last one
+    NSUInteger tokenTotalCount = [self tokenTotalCount];
+    NSUInteger tokenSkippedCount = [self tokenSkippedCount];
+    NSUInteger finishedCount = atomic_load_explicit(&(token->_finishedCount), memory_order_relaxed);
+    NSUInteger skippedCount = atomic_load_explicit(&(token->_skippedCount), memory_order_relaxed);
+    SDCallbackQueue *queue = token.context[SDWebImageContextCallbackQueue];
+    if (!queue) {
+        queue = self.callbackQueue;
+    }
+    [(queue ?: SDCallbackQueue.mainQueue) async:^{
+        if (shoulCallDelegate) {
+            [self.delegate imagePrefetcher:self didFinishWithTotalCount:tokenTotalCount skippedCount:tokenSkippedCount];
+        }
+        if (token.completionBlock) {
+            token.completionBlock(finishedCount, skippedCount);
+        }
+    }];
+}
+
+#pragma mark - Helper
+- (NSUInteger)tokenTotalCount {
+    NSUInteger tokenTotalCount = 0;
+    @synchronized (self.runningTokens) {
+        for (SDWebImagePrefetchToken *token in self.runningTokens) {
+            tokenTotalCount += token->_totalCount;
+        }
+    }
+    return tokenTotalCount;
+}
+
+- (NSUInteger)tokenSkippedCount {
+    NSUInteger tokenSkippedCount = 0;
+    @synchronized (self.runningTokens) {
+        for (SDWebImagePrefetchToken *token in self.runningTokens) {
+            tokenSkippedCount += atomic_load_explicit(&(token->_skippedCount), memory_order_relaxed);
+        }
+    }
+    return tokenSkippedCount;
+}
+
+- (NSUInteger)tokenFinishedCount {
+    NSUInteger tokenFinishedCount = 0;
+    @synchronized (self.runningTokens) {
+        for (SDWebImagePrefetchToken *token in self.runningTokens) {
+            tokenFinishedCount += atomic_load_explicit(&(token->_finishedCount), memory_order_relaxed);
+        }
+    }
+    return tokenFinishedCount;
+}
+
+- (void)addRunningToken:(SDWebImagePrefetchToken *)token {
+    if (!token) {
+        return;
+    }
+    @synchronized (self.runningTokens) {
+        [self.runningTokens addObject:token];
+    }
+}
+
+- (void)removeRunningToken:(SDWebImagePrefetchToken *)token {
+    if (!token) {
+        return;
+    }
+    @synchronized (self.runningTokens) {
+        [self.runningTokens removeObject:token];
+    }
+}
+
+- (NSUInteger)countOfRunningTokens {
+    NSUInteger count = 0;
+    @synchronized (self.runningTokens) {
+        count = self.runningTokens.count;
+    }
+    return count;
+}
+
+@end
+
+@implementation SDWebImagePrefetchToken
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        SD_LOCK_INIT(_prefetchOperationsLock);
+        SD_LOCK_INIT(_loadOperationsLock);
+    }
+    return self;
+}
+
+- (void)cancel {
+    SD_LOCK(_prefetchOperationsLock);
+    [self.prefetchOperations compact];
+    for (id operation in self.prefetchOperations) {
+        id<SDWebImageOperation> strongOperation = operation;
+        if (strongOperation) {
+            [strongOperation cancel];
+        }
+    }
+    self.prefetchOperations.count = 0;
+    SD_UNLOCK(_prefetchOperationsLock);
+    
+    SD_LOCK(_loadOperationsLock);
+    [self.loadOperations compact];
+    for (id operation in self.loadOperations) {
+        id<SDWebImageOperation> strongOperation = operation;
+        if (strongOperation) {
+            [strongOperation cancel];
+        }
+    }
+    self.loadOperations.count = 0;
+    SD_UNLOCK(_loadOperationsLock);
+    
+    self.completionBlock = nil;
+    self.progressBlock = nil;
+    [self.prefetcher removeRunningToken:self];
+}
+
+@end
diff --git a/SDWebImage/Core/SDWebImageTransition.h b/SDWebImage/Core/SDWebImageTransition.h
new file mode 100644
index 000000000..889372e49
--- /dev/null
+++ b/SDWebImage/Core/SDWebImageTransition.h
@@ -0,0 +1,131 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+
+#if SD_UIKIT || SD_MAC
+#import "SDImageCache.h"
+
+#if SD_UIKIT
+typedef UIViewAnimationOptions SDWebImageAnimationOptions;
+#else
+typedef NS_OPTIONS(NSUInteger, SDWebImageAnimationOptions) {
+    SDWebImageAnimationOptionAllowsImplicitAnimation   = 1 << 0, // specify `allowsImplicitAnimation` for the `NSAnimationContext`
+    
+    SDWebImageAnimationOptionCurveEaseInOut            = 0 << 16, // default
+    SDWebImageAnimationOptionCurveEaseIn               = 1 << 16,
+    SDWebImageAnimationOptionCurveEaseOut              = 2 << 16,
+    SDWebImageAnimationOptionCurveLinear               = 3 << 16,
+    
+    SDWebImageAnimationOptionTransitionNone            = 0 << 20, // default
+    SDWebImageAnimationOptionTransitionFlipFromLeft    = 1 << 20,
+    SDWebImageAnimationOptionTransitionFlipFromRight   = 2 << 20,
+    SDWebImageAnimationOptionTransitionCurlUp          = 3 << 20,
+    SDWebImageAnimationOptionTransitionCurlDown        = 4 << 20,
+    SDWebImageAnimationOptionTransitionCrossDissolve   = 5 << 20,
+    SDWebImageAnimationOptionTransitionFlipFromTop     = 6 << 20,
+    SDWebImageAnimationOptionTransitionFlipFromBottom  = 7 << 20,
+};
+#endif
+
+typedef void (^SDWebImageTransitionPreparesBlock)(__kindof UIView * _Nonnull view, UIImage * _Nullable image, NSData * _Nullable imageData, SDImageCacheType cacheType, NSURL * _Nullable imageURL);
+typedef void (^SDWebImageTransitionAnimationsBlock)(__kindof UIView * _Nonnull view, UIImage * _Nullable image);
+typedef void (^SDWebImageTransitionCompletionBlock)(BOOL finished);
+
+/**
+ This class is used to provide a transition animation after the view category load image finished. Use this on `sd_imageTransition` in UIView+WebCache.h
+ for UIKit(iOS & tvOS), we use `+[UIView transitionWithView:duration:options:animations:completion]` for transition animation.
+ for AppKit(macOS), we use `+[NSAnimationContext runAnimationGroup:completionHandler:]` for transition animation. You can call `+[NSAnimationContext currentContext]` to grab the context during animations block.
+ @note These transition are provided for basic usage. If you need complicated animation, consider to directly use Core Animation or use `SDWebImageAvoidAutoSetImage` and implement your own after image load finished.
+ */
+@interface SDWebImageTransition : NSObject
+
+/**
+ By default, we set the image to the view at the beginning of the animations. You can disable this and provide custom set image process
+ */
+@property (nonatomic, assign) BOOL avoidAutoSetImage;
+/**
+ The duration of the transition animation, measured in seconds. Defaults to 0.5.
+ */
+@property (nonatomic, assign) NSTimeInterval duration;
+/**
+ The timing function used for all animations within this transition animation (macOS).
+ */
+@property (nonatomic, strong, nullable) CAMediaTimingFunction *timingFunction API_UNAVAILABLE(ios, tvos, watchos) API_DEPRECATED("Use SDWebImageAnimationOptions instead, or grab NSAnimationContext.currentContext and modify the timingFunction", macos(10.10, 10.10));
+/**
+ A mask of options indicating how you want to perform the animations.
+ */
+@property (nonatomic, assign) SDWebImageAnimationOptions animationOptions;
+/**
+ A block object to be executed before the animation sequence starts.
+ */
+@property (nonatomic, copy, nullable) SDWebImageTransitionPreparesBlock prepares;
+/**
+ A block object that contains the changes you want to make to the specified view.
+ */
+@property (nonatomic, copy, nullable) SDWebImageTransitionAnimationsBlock animations;
+/**
+ A block object to be executed when the animation sequence ends.
+ */
+@property (nonatomic, copy, nullable) SDWebImageTransitionCompletionBlock completion;
+
+@end
+
+/**
+ Convenience way to create transition. Remember to specify the duration if needed.
+ for UIKit, these transition just use the correspond `animationOptions`. By default we enable `UIViewAnimationOptionAllowUserInteraction` to allow user interaction during transition.
+ for AppKit, these transition use Core Animation in `animations`. So your view must be layer-backed. Set `wantsLayer = YES` before you apply it.
+ */
+@interface SDWebImageTransition (Conveniences)
+
+/// Fade-in transition.
+@property (nonatomic, class, nonnull, readonly) SDWebImageTransition *fadeTransition;
+/// Flip from left transition.
+@property (nonatomic, class, nonnull, readonly) SDWebImageTransition *flipFromLeftTransition;
+/// Flip from right transition.
+@property (nonatomic, class, nonnull, readonly) SDWebImageTransition *flipFromRightTransition;
+/// Flip from top transition.
+@property (nonatomic, class, nonnull, readonly) SDWebImageTransition *flipFromTopTransition;
+/// Flip from bottom transition.
+@property (nonatomic, class, nonnull, readonly) SDWebImageTransition *flipFromBottomTransition;
+/// Curl up transition.
+@property (nonatomic, class, nonnull, readonly) SDWebImageTransition *curlUpTransition;
+/// Curl down transition.
+@property (nonatomic, class, nonnull, readonly) SDWebImageTransition *curlDownTransition;
+
+/// Fade-in transition with duration.
+/// @param duration transition duration, use ease-in-out
++ (nonnull instancetype)fadeTransitionWithDuration:(NSTimeInterval)duration NS_SWIFT_NAME(fade(duration:));
+
+/// Flip from left  transition with duration.
+/// @param duration transition duration, use ease-in-out
++ (nonnull instancetype)flipFromLeftTransitionWithDuration:(NSTimeInterval)duration NS_SWIFT_NAME(flipFromLeft(duration:));
+
+/// Flip from right transition with duration.
+/// @param duration transition duration, use ease-in-out
++ (nonnull instancetype)flipFromRightTransitionWithDuration:(NSTimeInterval)duration NS_SWIFT_NAME(flipFromRight(duration:));
+
+/// Flip from top transition with duration.
+/// @param duration transition duration, use ease-in-out
++ (nonnull instancetype)flipFromTopTransitionWithDuration:(NSTimeInterval)duration NS_SWIFT_NAME(flipFromTop(duration:));
+
+/// Flip from bottom transition with duration.
+/// @param duration transition duration, use ease-in-out
++ (nonnull instancetype)flipFromBottomTransitionWithDuration:(NSTimeInterval)duration NS_SWIFT_NAME(flipFromBottom(duration:));
+
+///  Curl up transition with duration.
+/// @param duration transition duration, use ease-in-out
++ (nonnull instancetype)curlUpTransitionWithDuration:(NSTimeInterval)duration NS_SWIFT_NAME(curlUp(duration:));
+
+/// Curl down transition with duration.
+/// @param duration transition duration, use ease-in-out
++ (nonnull instancetype)curlDownTransitionWithDuration:(NSTimeInterval)duration NS_SWIFT_NAME(curlDown(duration:));
+
+@end
+
+#endif
diff --git a/SDWebImage/Core/SDWebImageTransition.m b/SDWebImage/Core/SDWebImageTransition.m
new file mode 100644
index 000000000..4990a732b
--- /dev/null
+++ b/SDWebImage/Core/SDWebImageTransition.m
@@ -0,0 +1,194 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageTransition.h"
+
+#if SD_UIKIT || SD_MAC
+
+#if SD_MAC
+#import "SDWebImageTransitionInternal.h"
+#import "SDInternalMacros.h"
+
+CAMediaTimingFunction * SDTimingFunctionFromAnimationOptions(SDWebImageAnimationOptions options) {
+    if (SD_OPTIONS_CONTAINS(SDWebImageAnimationOptionCurveLinear, options)) {
+        return [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
+    } else if (SD_OPTIONS_CONTAINS(SDWebImageAnimationOptionCurveEaseIn, options)) {
+        return [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
+    } else if (SD_OPTIONS_CONTAINS(SDWebImageAnimationOptionCurveEaseOut, options)) {
+        return [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
+    } else if (SD_OPTIONS_CONTAINS(SDWebImageAnimationOptionCurveEaseInOut, options)) {
+        return [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
+    } else {
+        return [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionDefault];
+    }
+}
+
+CATransition * SDTransitionFromAnimationOptions(SDWebImageAnimationOptions options) {
+    if (SD_OPTIONS_CONTAINS(options, SDWebImageAnimationOptionTransitionCrossDissolve)) {
+        CATransition *trans = [CATransition animation];
+        trans.type = kCATransitionFade;
+        return trans;
+    } else if (SD_OPTIONS_CONTAINS(options, SDWebImageAnimationOptionTransitionFlipFromLeft)) {
+        CATransition *trans = [CATransition animation];
+        trans.type = kCATransitionPush;
+        trans.subtype = kCATransitionFromLeft;
+        return trans;
+    } else if (SD_OPTIONS_CONTAINS(options, SDWebImageAnimationOptionTransitionFlipFromRight)) {
+        CATransition *trans = [CATransition animation];
+        trans.type = kCATransitionPush;
+        trans.subtype = kCATransitionFromRight;
+        return trans;
+    } else if (SD_OPTIONS_CONTAINS(options, SDWebImageAnimationOptionTransitionFlipFromTop)) {
+        CATransition *trans = [CATransition animation];
+        trans.type = kCATransitionPush;
+        trans.subtype = kCATransitionFromTop;
+        return trans;
+    } else if (SD_OPTIONS_CONTAINS(options, SDWebImageAnimationOptionTransitionFlipFromBottom)) {
+        CATransition *trans = [CATransition animation];
+        trans.type = kCATransitionPush;
+        trans.subtype = kCATransitionFromBottom;
+        return trans;
+    } else if (SD_OPTIONS_CONTAINS(options, SDWebImageAnimationOptionTransitionCurlUp)) {
+        CATransition *trans = [CATransition animation];
+        trans.type = kCATransitionReveal;
+        trans.subtype = kCATransitionFromTop;
+        return trans;
+    } else if (SD_OPTIONS_CONTAINS(options, SDWebImageAnimationOptionTransitionCurlDown)) {
+        CATransition *trans = [CATransition animation];
+        trans.type = kCATransitionReveal;
+        trans.subtype = kCATransitionFromBottom;
+        return trans;
+    } else {
+        return nil;
+    }
+}
+#endif
+
+@implementation SDWebImageTransition
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        self.duration = 0.5;
+    }
+    return self;
+}
+
+@end
+
+@implementation SDWebImageTransition (Conveniences)
+
++ (SDWebImageTransition *)fadeTransition {
+    return [self fadeTransitionWithDuration:0.5];
+}
+
++ (SDWebImageTransition *)fadeTransitionWithDuration:(NSTimeInterval)duration {
+    SDWebImageTransition *transition = [SDWebImageTransition new];
+    transition.duration = duration;
+#if SD_UIKIT
+    transition.animationOptions = UIViewAnimationOptionTransitionCrossDissolve | UIViewAnimationOptionAllowUserInteraction;
+#else
+    transition.animationOptions = SDWebImageAnimationOptionTransitionCrossDissolve;
+#endif
+    return transition;
+}
+
++ (SDWebImageTransition *)flipFromLeftTransition {
+    return [self flipFromLeftTransitionWithDuration:0.5];
+}
+
++ (SDWebImageTransition *)flipFromLeftTransitionWithDuration:(NSTimeInterval)duration {
+    SDWebImageTransition *transition = [SDWebImageTransition new];
+    transition.duration = duration;
+#if SD_UIKIT
+    transition.animationOptions = UIViewAnimationOptionTransitionFlipFromLeft | UIViewAnimationOptionAllowUserInteraction;
+#else
+    transition.animationOptions = SDWebImageAnimationOptionTransitionFlipFromLeft;
+#endif
+    return transition;
+}
+
++ (SDWebImageTransition *)flipFromRightTransition {
+    return [self flipFromRightTransitionWithDuration:0.5];
+}
+
++ (SDWebImageTransition *)flipFromRightTransitionWithDuration:(NSTimeInterval)duration {
+    SDWebImageTransition *transition = [SDWebImageTransition new];
+    transition.duration = duration;
+#if SD_UIKIT
+    transition.animationOptions = UIViewAnimationOptionTransitionFlipFromRight | UIViewAnimationOptionAllowUserInteraction;
+#else
+    transition.animationOptions = SDWebImageAnimationOptionTransitionFlipFromRight;
+#endif
+    return transition;
+}
+
++ (SDWebImageTransition *)flipFromTopTransition {
+    return [self flipFromTopTransitionWithDuration:0.5];
+}
+
++ (SDWebImageTransition *)flipFromTopTransitionWithDuration:(NSTimeInterval)duration {
+    SDWebImageTransition *transition = [SDWebImageTransition new];
+    transition.duration = duration;
+#if SD_UIKIT
+    transition.animationOptions = UIViewAnimationOptionTransitionFlipFromTop | UIViewAnimationOptionAllowUserInteraction;
+#else
+    transition.animationOptions = SDWebImageAnimationOptionTransitionFlipFromTop;
+#endif
+    return transition;
+}
+
++ (SDWebImageTransition *)flipFromBottomTransition {
+    return [self flipFromBottomTransitionWithDuration:0.5];
+}
+
++ (SDWebImageTransition *)flipFromBottomTransitionWithDuration:(NSTimeInterval)duration {
+    SDWebImageTransition *transition = [SDWebImageTransition new];
+    transition.duration = duration;
+#if SD_UIKIT
+    transition.animationOptions = UIViewAnimationOptionTransitionFlipFromBottom | UIViewAnimationOptionAllowUserInteraction;
+#else
+    transition.animationOptions = SDWebImageAnimationOptionTransitionFlipFromBottom;
+#endif
+    return transition;
+}
+
++ (SDWebImageTransition *)curlUpTransition {
+    return [self curlUpTransitionWithDuration:0.5];
+}
+
++ (SDWebImageTransition *)curlUpTransitionWithDuration:(NSTimeInterval)duration {
+    SDWebImageTransition *transition = [SDWebImageTransition new];
+    transition.duration = duration;
+#if SD_UIKIT
+    transition.animationOptions = UIViewAnimationOptionTransitionCurlUp | UIViewAnimationOptionAllowUserInteraction;
+#else
+    transition.animationOptions = SDWebImageAnimationOptionTransitionCurlUp;
+#endif
+    return transition;
+}
+
++ (SDWebImageTransition *)curlDownTransition {
+    return [self curlDownTransitionWithDuration:0.5];
+}
+
++ (SDWebImageTransition *)curlDownTransitionWithDuration:(NSTimeInterval)duration {
+    SDWebImageTransition *transition = [SDWebImageTransition new];
+    transition.duration = duration;
+#if SD_UIKIT
+    transition.animationOptions = UIViewAnimationOptionTransitionCurlDown | UIViewAnimationOptionAllowUserInteraction;
+#else
+    transition.animationOptions = SDWebImageAnimationOptionTransitionCurlDown;
+#endif
+    transition.duration = duration;
+    return transition;
+}
+
+@end
+
+#endif
diff --git a/SDWebImage/Core/UIButton+WebCache.h b/SDWebImage/Core/UIButton+WebCache.h
new file mode 100644
index 000000000..8a898c734
--- /dev/null
+++ b/SDWebImage/Core/UIButton+WebCache.h
@@ -0,0 +1,402 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+
+#if SD_UIKIT
+
+#import "SDWebImageManager.h"
+
+/**
+ * Integrates SDWebImage async downloading and caching of remote images with UIButton.
+ */
+@interface UIButton (WebCache)
+
+#pragma mark - Image
+
+/**
+ * Get the current image URL.
+ * This simply translate to `[self sd_imageURLForState:self.state]` from v5.18.0
+ */
+@property (nonatomic, strong, readonly, nullable) NSURL *sd_currentImageURL;
+
+/**
+ * Get the image URL for a control state.
+ * 
+ * @param state Which state you want to know the URL for. The values are described in UIControlState.
+ */
+- (nullable NSURL *)sd_imageURLForState:(UIControlState)state;
+
+/**
+ * Get the image operation key for a control state.
+ *
+ * @param state Which state you want to know the URL for. The values are described in UIControlState.
+ */
+- (nonnull NSString *)sd_imageOperationKeyForState:(UIControlState)state;
+
+/**
+ * Set the button `image` with an `url`.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url   The url for the image.
+ * @param state The state that uses the specified title. The values are described in UIControlState.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+                  forState:(UIControlState)state NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the button `image` with an `url` and a placeholder.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url         The url for the image.
+ * @param state       The state that uses the specified title. The values are described in UIControlState.
+ * @param placeholder The image to be set initially, until the image request finishes.
+ * @see sd_setImageWithURL:placeholderImage:options:
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+                  forState:(UIControlState)state
+          placeholderImage:(nullable UIImage *)placeholder NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the button `image` with an `url`, placeholder and custom options.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url         The url for the image.
+ * @param state       The state that uses the specified title. The values are described in UIControlState.
+ * @param placeholder The image to be set initially, until the image request finishes.
+ * @param options     The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+                  forState:(UIControlState)state
+          placeholderImage:(nullable UIImage *)placeholder
+                   options:(SDWebImageOptions)options NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the button `image` with an `url`, placeholder, custom options and context.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url         The url for the image.
+ * @param state       The state that uses the specified title. The values are described in UIControlState.
+ * @param placeholder The image to be set initially, until the image request finishes.
+ * @param options     The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param context     A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+                  forState:(UIControlState)state
+          placeholderImage:(nullable UIImage *)placeholder
+                   options:(SDWebImageOptions)options
+                   context:(nullable SDWebImageContext *)context;
+
+/**
+ * Set the button `image` with an `url`.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param state          The state that uses the specified title. The values are described in UIControlState.
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+                  forState:(UIControlState)state
+                 completed:(nullable SDExternalCompletionBlock)completedBlock;
+
+/**
+ * Set the button `image` with an `url`, placeholder.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param state          The state that uses the specified title. The values are described in UIControlState.
+ * @param placeholder    The image to be set initially, until the image request finishes.
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+                  forState:(UIControlState)state
+          placeholderImage:(nullable UIImage *)placeholder
+                 completed:(nullable SDExternalCompletionBlock)completedBlock NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the button `image` with an `url`, placeholder and custom options.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param state          The state that uses the specified title. The values are described in UIControlState.
+ * @param placeholder    The image to be set initially, until the image request finishes.
+ * @param options        The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+                  forState:(UIControlState)state
+          placeholderImage:(nullable UIImage *)placeholder
+                   options:(SDWebImageOptions)options
+                 completed:(nullable SDExternalCompletionBlock)completedBlock;
+
+/**
+ * Set the button `image` with an `url`, placeholder and custom options.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param state          The state that uses the specified title. The values are described in UIControlState.
+ * @param placeholder    The image to be set initially, until the image request finishes.
+ * @param options        The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param progressBlock  A block called while image is downloading
+ *                       @note the progress block is executed on a background queue
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+                  forState:(UIControlState)state
+          placeholderImage:(nullable UIImage *)placeholder
+                   options:(SDWebImageOptions)options
+                  progress:(nullable SDImageLoaderProgressBlock)progressBlock
+                 completed:(nullable SDExternalCompletionBlock)completedBlock;
+
+/**
+ * Set the button `image` with an `url`, placeholder, custom options and context.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param state          The state that uses the specified title. The values are described in UIControlState.
+ * @param placeholder    The image to be set initially, until the image request finishes.
+ * @param options        The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param context        A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
+ * @param progressBlock  A block called while image is downloading
+ *                       @note the progress block is executed on a background queue
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+                  forState:(UIControlState)state
+          placeholderImage:(nullable UIImage *)placeholder
+                   options:(SDWebImageOptions)options
+                   context:(nullable SDWebImageContext *)context
+                  progress:(nullable SDImageLoaderProgressBlock)progressBlock
+                 completed:(nullable SDExternalCompletionBlock)completedBlock;
+
+#pragma mark - Background Image
+
+/**
+ * Get the current background image URL.
+ */
+@property (nonatomic, strong, readonly, nullable) NSURL *sd_currentBackgroundImageURL;
+
+/**
+ * Get the background image operation key for a control state.
+ *
+ * @param state Which state you want to know the URL for. The values are described in UIControlState.
+ */
+- (nonnull NSString *)sd_backgroundImageOperationKeyForState:(UIControlState)state;
+
+/**
+ * Get the background image URL for a control state.
+ * 
+ * @param state Which state you want to know the URL for. The values are described in UIControlState.
+ */
+- (nullable NSURL *)sd_backgroundImageURLForState:(UIControlState)state;
+
+/**
+ * Set the button `backgroundImage` with an `url`.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url   The url for the image.
+ * @param state The state that uses the specified title. The values are described in UIControlState.
+ */
+- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url
+                            forState:(UIControlState)state NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the button `backgroundImage` with an `url` and a placeholder.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url         The url for the image.
+ * @param state       The state that uses the specified title. The values are described in UIControlState.
+ * @param placeholder The image to be set initially, until the image request finishes.
+ * @see sd_setImageWithURL:placeholderImage:options:
+ */
+- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url
+                            forState:(UIControlState)state
+                    placeholderImage:(nullable UIImage *)placeholder NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the button `backgroundImage` with an `url`, placeholder and custom options.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url         The url for the image.
+ * @param state       The state that uses the specified title. The values are described in UIControlState.
+ * @param placeholder The image to be set initially, until the image request finishes.
+ * @param options     The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ */
+- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url
+                            forState:(UIControlState)state
+                    placeholderImage:(nullable UIImage *)placeholder
+                             options:(SDWebImageOptions)options NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the button `backgroundImage` with an `url`, placeholder, custom options and context.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url         The url for the image.
+ * @param state       The state that uses the specified title. The values are described in UIControlState.
+ * @param placeholder The image to be set initially, until the image request finishes.
+ * @param options     The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param context     A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
+ */
+- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url
+                            forState:(UIControlState)state
+                    placeholderImage:(nullable UIImage *)placeholder
+                             options:(SDWebImageOptions)options
+                             context:(nullable SDWebImageContext *)context;
+
+/**
+ * Set the button `backgroundImage` with an `url`.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param state          The state that uses the specified title. The values are described in UIControlState.
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url
+                            forState:(UIControlState)state
+                           completed:(nullable SDExternalCompletionBlock)completedBlock;
+
+/**
+ * Set the button `backgroundImage` with an `url`, placeholder.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param state          The state that uses the specified title. The values are described in UIControlState.
+ * @param placeholder    The image to be set initially, until the image request finishes.
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url
+                            forState:(UIControlState)state
+                    placeholderImage:(nullable UIImage *)placeholder
+                           completed:(nullable SDExternalCompletionBlock)completedBlock NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the button `backgroundImage` with an `url`, placeholder and custom options.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param placeholder    The image to be set initially, until the image request finishes.
+ * @param options        The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url
+                            forState:(UIControlState)state
+                    placeholderImage:(nullable UIImage *)placeholder
+                             options:(SDWebImageOptions)options
+                           completed:(nullable SDExternalCompletionBlock)completedBlock;
+
+/**
+ * Set the button `backgroundImage` with an `url`, placeholder and custom options.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param placeholder    The image to be set initially, until the image request finishes.
+ * @param options        The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param progressBlock  A block called while image is downloading
+ *                       @note the progress block is executed on a background queue
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url
+                            forState:(UIControlState)state
+                    placeholderImage:(nullable UIImage *)placeholder
+                             options:(SDWebImageOptions)options
+                            progress:(nullable SDImageLoaderProgressBlock)progressBlock
+                           completed:(nullable SDExternalCompletionBlock)completedBlock;
+
+/**
+ * Set the button `backgroundImage` with an `url`, placeholder, custom options and context.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param placeholder    The image to be set initially, until the image request finishes.
+ * @param options        The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param context        A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
+ * @param progressBlock  A block called while image is downloading
+ *                       @note the progress block is executed on a background queue
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url
+                            forState:(UIControlState)state
+                    placeholderImage:(nullable UIImage *)placeholder
+                             options:(SDWebImageOptions)options
+                             context:(nullable SDWebImageContext *)context
+                            progress:(nullable SDImageLoaderProgressBlock)progressBlock
+                           completed:(nullable SDExternalCompletionBlock)completedBlock;
+
+#pragma mark - Cancel
+
+/**
+ * Cancel the current image download
+ */
+- (void)sd_cancelImageLoadForState:(UIControlState)state;
+
+/**
+ * Cancel the current backgroundImage download
+ */
+- (void)sd_cancelBackgroundImageLoadForState:(UIControlState)state;
+
+@end
+
+#endif
diff --git a/SDWebImage/Core/UIButton+WebCache.m b/SDWebImage/Core/UIButton+WebCache.m
new file mode 100644
index 000000000..0948afeb9
--- /dev/null
+++ b/SDWebImage/Core/UIButton+WebCache.m
@@ -0,0 +1,201 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "UIButton+WebCache.h"
+
+#if SD_UIKIT
+
+#import "objc/runtime.h"
+#import "UIView+WebCacheOperation.h"
+#import "UIView+WebCacheState.h"
+#import "UIView+WebCache.h"
+#import "SDInternalMacros.h"
+
+@implementation UIButton (WebCache)
+
+#pragma mark - Image
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url forState:(UIControlState)state {
+    [self sd_setImageWithURL:url forState:state placeholderImage:nil options:0 completed:nil];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url forState:(UIControlState)state placeholderImage:(nullable UIImage *)placeholder {
+    [self sd_setImageWithURL:url forState:state placeholderImage:placeholder options:0 completed:nil];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url forState:(UIControlState)state placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options {
+    [self sd_setImageWithURL:url forState:state placeholderImage:placeholder options:options progress:nil completed:nil];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url forState:(UIControlState)state placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options context:(nullable SDWebImageContext *)context {
+    [self sd_setImageWithURL:url forState:state placeholderImage:placeholder options:options context:context progress:nil completed:nil];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url forState:(UIControlState)state completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setImageWithURL:url forState:state placeholderImage:nil options:0 completed:completedBlock];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url forState:(UIControlState)state placeholderImage:(nullable UIImage *)placeholder completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setImageWithURL:url forState:state placeholderImage:placeholder options:0 completed:completedBlock];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url forState:(UIControlState)state placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setImageWithURL:url forState:state placeholderImage:placeholder options:options progress:nil completed:completedBlock];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url forState:(UIControlState)state placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options progress:(nullable SDImageLoaderProgressBlock)progressBlock completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setImageWithURL:url forState:state placeholderImage:placeholder options:options context:nil progress:progressBlock completed:completedBlock];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+                  forState:(UIControlState)state
+          placeholderImage:(nullable UIImage *)placeholder
+                   options:(SDWebImageOptions)options
+                   context:(nullable SDWebImageContext *)context
+                  progress:(nullable SDImageLoaderProgressBlock)progressBlock
+                 completed:(nullable SDExternalCompletionBlock)completedBlock {
+    SDWebImageMutableContext *mutableContext;
+    if (context) {
+        mutableContext = [context mutableCopy];
+    } else {
+        mutableContext = [NSMutableDictionary dictionary];
+    }
+    mutableContext[SDWebImageContextSetImageOperationKey] = [self sd_imageOperationKeyForState:state];
+    @weakify(self);
+    [self sd_internalSetImageWithURL:url
+                    placeholderImage:placeholder
+                             options:options
+                             context:mutableContext
+                       setImageBlock:^(UIImage * _Nullable image, NSData * _Nullable imageData, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+                           @strongify(self);
+                           if (!self) {
+                               return;
+                           }
+                           [self setImage:image forState:state];
+                       }
+                            progress:progressBlock
+                           completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+                               if (completedBlock) {
+                                   completedBlock(image, error, cacheType, imageURL);
+                               }
+                           }];
+}
+
+#pragma mark - Background Image
+
+- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url forState:(UIControlState)state {
+    [self sd_setBackgroundImageWithURL:url forState:state placeholderImage:nil options:0 completed:nil];
+}
+
+- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url forState:(UIControlState)state placeholderImage:(nullable UIImage *)placeholder {
+    [self sd_setBackgroundImageWithURL:url forState:state placeholderImage:placeholder options:0 completed:nil];
+}
+
+- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url forState:(UIControlState)state placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options {
+    [self sd_setBackgroundImageWithURL:url forState:state placeholderImage:placeholder options:options progress:nil completed:nil];
+}
+
+- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url forState:(UIControlState)state placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options context:(nullable SDWebImageContext *)context {
+    [self sd_setBackgroundImageWithURL:url forState:state placeholderImage:placeholder options:options context:context progress:nil completed:nil];
+}
+
+- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url forState:(UIControlState)state completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setBackgroundImageWithURL:url forState:state placeholderImage:nil options:0 completed:completedBlock];
+}
+
+- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url forState:(UIControlState)state placeholderImage:(nullable UIImage *)placeholder completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setBackgroundImageWithURL:url forState:state placeholderImage:placeholder options:0 completed:completedBlock];
+}
+
+- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url forState:(UIControlState)state placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setBackgroundImageWithURL:url forState:state placeholderImage:placeholder options:options progress:nil completed:completedBlock];
+}
+
+- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url forState:(UIControlState)state placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options progress:(nullable SDImageLoaderProgressBlock)progressBlock completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setBackgroundImageWithURL:url forState:state placeholderImage:placeholder options:options context:nil progress:progressBlock completed:completedBlock];
+}
+
+- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url
+                            forState:(UIControlState)state
+                    placeholderImage:(nullable UIImage *)placeholder
+                             options:(SDWebImageOptions)options
+                             context:(nullable SDWebImageContext *)context
+                            progress:(nullable SDImageLoaderProgressBlock)progressBlock
+                           completed:(nullable SDExternalCompletionBlock)completedBlock {
+    SDWebImageMutableContext *mutableContext;
+    if (context) {
+        mutableContext = [context mutableCopy];
+    } else {
+        mutableContext = [NSMutableDictionary dictionary];
+    }
+    mutableContext[SDWebImageContextSetImageOperationKey] = [self sd_backgroundImageOperationKeyForState:state];
+    @weakify(self);
+    [self sd_internalSetImageWithURL:url
+                    placeholderImage:placeholder
+                             options:options
+                             context:mutableContext
+                       setImageBlock:^(UIImage * _Nullable image, NSData * _Nullable imageData, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+                           @strongify(self);
+                           [self setBackgroundImage:image forState:state];
+                       }
+                            progress:progressBlock
+                           completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+                               if (completedBlock) {
+                                   completedBlock(image, error, cacheType, imageURL);
+                               }
+                           }];
+}
+
+#pragma mark - Cancel
+
+- (void)sd_cancelImageLoadForState:(UIControlState)state {
+    [self sd_cancelImageLoadOperationWithKey:[self sd_imageOperationKeyForState:state]];
+}
+
+- (void)sd_cancelBackgroundImageLoadForState:(UIControlState)state {
+    [self sd_cancelImageLoadOperationWithKey:[self sd_backgroundImageOperationKeyForState:state]];
+}
+
+#pragma mark - State
+
+- (NSString *)sd_imageOperationKeyForState:(UIControlState)state {
+    return [NSString stringWithFormat:@"UIButtonImageOperation%lu", (unsigned long)state];
+}
+
+- (NSString *)sd_backgroundImageOperationKeyForState:(UIControlState)state {
+    return [NSString stringWithFormat:@"UIButtonBackgroundImageOperation%lu", (unsigned long)state];
+}
+
+- (NSURL *)sd_currentImageURL {
+    NSURL *url = [self sd_imageURLForState:self.state];
+    if (!url) {
+        [self sd_imageURLForState:UIControlStateNormal];
+    }
+    return url;
+}
+
+- (NSURL *)sd_imageURLForState:(UIControlState)state {
+    return [self sd_imageLoadStateForKey:[self sd_imageOperationKeyForState:state]].url;
+}
+#pragma mark - Background State
+
+- (NSURL *)sd_currentBackgroundImageURL {
+    NSURL *url = [self sd_backgroundImageURLForState:self.state];
+    if (!url) {
+        url = [self sd_backgroundImageURLForState:UIControlStateNormal];
+    }
+    return url;
+}
+
+- (NSURL *)sd_backgroundImageURLForState:(UIControlState)state {
+    return [self sd_imageLoadStateForKey:[self sd_backgroundImageOperationKeyForState:state]].url;
+}
+
+@end
+
+#endif
diff --git a/SDWebImage/Core/UIImage+ExtendedCacheData.h b/SDWebImage/Core/UIImage+ExtendedCacheData.h
new file mode 100644
index 000000000..482c8c40a
--- /dev/null
+++ b/SDWebImage/Core/UIImage+ExtendedCacheData.h
@@ -0,0 +1,24 @@
+/*
+* This file is part of the SDWebImage package.
+* (c) Olivier Poitrey <rs@dailymotion.com>
+* (c) Fabrice Aneche
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code.
+*/
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCompat.h"
+
+@interface UIImage (ExtendedCacheData)
+
+/**
+ Read and Write the extended object and bind it to the image. Which can hold some extra metadata like Image's scale factor, URL rich link, date, etc.
+ The extended object should conforms to NSCoding, which we use `NSKeyedArchiver` and `NSKeyedUnarchiver` to archive it to data, and write to disk cache.
+ @note The disk cache preserve both of the data and extended data with the same cache key. For manual query, use the `SDDiskCache` protocol method `extendedDataForKey:` instead.
+ @note You can specify arbitrary object conforms to NSCoding (NSObject protocol here is used to support object using `NS_ROOT_CLASS`, which is not NSObject subclass). If you load image from disk cache, you should check the extended object class to avoid corrupted data.
+ @warning This object don't need to implements NSSecureCoding (but it's recommended),  because we allows arbitrary class.
+ */
+@property (nonatomic, strong, nullable) id<NSObject, NSCoding> sd_extendedObject;
+
+@end
diff --git a/SDWebImage/Core/UIImage+ExtendedCacheData.m b/SDWebImage/Core/UIImage+ExtendedCacheData.m
new file mode 100644
index 000000000..05d29cff0
--- /dev/null
+++ b/SDWebImage/Core/UIImage+ExtendedCacheData.m
@@ -0,0 +1,23 @@
+/*
+* This file is part of the SDWebImage package.
+* (c) Olivier Poitrey <rs@dailymotion.com>
+* (c) Fabrice Aneche
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code.
+*/
+
+#import "UIImage+ExtendedCacheData.h"
+#import <objc/runtime.h>
+
+@implementation UIImage (ExtendedCacheData)
+
+- (id<NSObject, NSCoding>)sd_extendedObject {
+    return objc_getAssociatedObject(self, @selector(sd_extendedObject));
+}
+
+- (void)setSd_extendedObject:(id<NSObject, NSCoding>)sd_extendedObject {
+    objc_setAssociatedObject(self, @selector(sd_extendedObject), sd_extendedObject, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+}
+
+@end
diff --git a/SDWebImage/Core/UIImage+ForceDecode.h b/SDWebImage/Core/UIImage+ForceDecode.h
new file mode 100644
index 000000000..658659ad0
--- /dev/null
+++ b/SDWebImage/Core/UIImage+ForceDecode.h
@@ -0,0 +1,52 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+
+/**
+ UIImage category about force decode feature (avoid Image/IO's lazy decoding during rendering behavior).
+ */
+@interface UIImage (ForceDecode)
+
+/**
+ A bool value indicating whether the image has already been decoded. This can help to avoid extra force decode.
+ Force decode is used for 2 cases:
+ -- 1. for ImageIO created image (via `CGImageCreateWithImageSource` SPI), it's lazy and we trigger the decode before rendering
+ -- 2. for non-ImageIO created image (via `CGImageCreate` API), we can ensure it's alignment is suitable to render on screen without copy by CoreAnimation
+ @note For coder plugin developer, always use the SDImageCoderHelper's `colorSpaceGetDeviceRGB`/`preferredPixelFormat` to create CGImage.
+ @note For more information why force decode, see: https://github.com/path/FastImageCache#byte-alignment
+ @note From v5.17.0, the default value is always NO. Use `SDImageForceDecodePolicy` to control complicated policy.
+ */
+@property (nonatomic, assign) BOOL sd_isDecoded;
+
+/**
+ Decode the provided image. This is useful if you want to force decode the image before rendering to improve performance.
+
+ @param image The image to be decoded
+ @return The decoded image
+ */
++ (nullable UIImage *)sd_decodedImageWithImage:(nullable UIImage *)image;
+
+/**
+ Decode and scale down the provided image
+
+ @param image The image to be decoded
+ @return The decoded and scaled down image
+ */
++ (nullable UIImage *)sd_decodedAndScaledDownImageWithImage:(nullable UIImage *)image;
+
+/**
+ Decode and scale down the provided image with limit bytes
+ 
+ @param image The image to be decoded
+ @param bytes The limit bytes size. Provide 0 to use the build-in limit.
+ @return The decoded and scaled down image
+ */
++ (nullable UIImage *)sd_decodedAndScaledDownImageWithImage:(nullable UIImage *)image limitBytes:(NSUInteger)bytes;
+
+@end
diff --git a/SDWebImage/Core/UIImage+ForceDecode.m b/SDWebImage/Core/UIImage+ForceDecode.m
new file mode 100644
index 000000000..17b122eb7
--- /dev/null
+++ b/SDWebImage/Core/UIImage+ForceDecode.m
@@ -0,0 +1,43 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "UIImage+ForceDecode.h"
+#import "SDImageCoderHelper.h"
+#import "objc/runtime.h"
+#import "NSImage+Compatibility.h"
+
+@implementation UIImage (ForceDecode)
+
+- (BOOL)sd_isDecoded {
+    NSNumber *value = objc_getAssociatedObject(self, @selector(sd_isDecoded));
+    return [value boolValue];
+}
+
+- (void)setSd_isDecoded:(BOOL)sd_isDecoded {
+    objc_setAssociatedObject(self, @selector(sd_isDecoded), @(sd_isDecoded), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+}
+
++ (nullable UIImage *)sd_decodedImageWithImage:(nullable UIImage *)image {
+    if (!image) {
+        return nil;
+    }
+    return [SDImageCoderHelper decodedImageWithImage:image];
+}
+
++ (nullable UIImage *)sd_decodedAndScaledDownImageWithImage:(nullable UIImage *)image {
+    return [self sd_decodedAndScaledDownImageWithImage:image limitBytes:0];
+}
+
++ (nullable UIImage *)sd_decodedAndScaledDownImageWithImage:(nullable UIImage *)image limitBytes:(NSUInteger)bytes {
+    if (!image) {
+        return nil;
+    }
+    return [SDImageCoderHelper decodedAndScaledDownImageWithImage:image limitBytes:bytes];
+}
+
+@end
diff --git a/SDWebImage/Core/UIImage+GIF.h b/SDWebImage/Core/UIImage+GIF.h
new file mode 100644
index 000000000..5da8e197c
--- /dev/null
+++ b/SDWebImage/Core/UIImage+GIF.h
@@ -0,0 +1,26 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ * (c) Laurin Brandner
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+
+/**
+ This category is just use as a convenience method. For more detail control, use methods in `UIImage+MultiFormat.h` or directly use `SDImageCoder`.
+ */
+@interface UIImage (GIF)
+
+/**
+ Creates an animated UIImage from an NSData.
+ This will create animated image if the data is Animated GIF. And will create a static image is the data is Static GIF.
+
+ @param data The GIF data
+ @return The created image
+ */
++ (nullable UIImage *)sd_imageWithGIFData:(nullable NSData *)data;
+
+@end
diff --git a/SDWebImage/UIImage+GIF.m b/SDWebImage/Core/UIImage+GIF.m
similarity index 60%
rename from SDWebImage/UIImage+GIF.m
rename to SDWebImage/Core/UIImage+GIF.m
index 6fbca7ae4..7158cf318 100644
--- a/SDWebImage/UIImage+GIF.m
+++ b/SDWebImage/Core/UIImage+GIF.m
@@ -8,20 +8,15 @@
  */
 
 #import "UIImage+GIF.h"
-#import "SDWebImageGIFCoder.h"
-#import "NSImage+WebCache.h"
+#import "SDImageGIFCoder.h"
 
 @implementation UIImage (GIF)
 
-+ (UIImage *)sd_animatedGIFWithData:(NSData *)data {
++ (nullable UIImage *)sd_imageWithGIFData:(nullable NSData *)data {
     if (!data) {
         return nil;
     }
-    return [[SDWebImageGIFCoder sharedCoder] decodedImageWithData:data];
-}
-
-- (BOOL)isGIF {
-    return (self.images != nil);
+    return [[SDImageGIFCoder sharedCoder] decodedImageWithData:data options:0];
 }
 
 @end
diff --git a/SDWebImage/Core/UIImage+MemoryCacheCost.h b/SDWebImage/Core/UIImage+MemoryCacheCost.h
new file mode 100644
index 000000000..0ff2f2fdb
--- /dev/null
+++ b/SDWebImage/Core/UIImage+MemoryCacheCost.h
@@ -0,0 +1,27 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+
+/**
+ UIImage category for memory cache cost.
+ */
+@interface UIImage (MemoryCacheCost)
+
+/**
+ The memory cache cost for specify image used by image cache. The cost function is the bytes size held in memory.
+ If you set some associated object to `UIImage`, you can set the custom value to indicate the memory cost.
+ 
+ For `UIImage`, this method return the single frame bytes size when `image.images` is nil for static image. Return full frame bytes size when `image.images` is not nil for animated image.
+ For `NSImage`, this method return the single frame bytes size because `NSImage` does not store all frames in memory.
+ @note Note that because of the limitations of category this property can get out of sync if you create another instance with CGImage or other methods.
+ @note For custom animated class conforms to `SDAnimatedImage`, you can override this getter method in your subclass to return a more proper value instead, which representing the current frame's total bytes.
+ */
+@property (assign, nonatomic) NSUInteger sd_memoryCost;
+
+@end
diff --git a/SDWebImage/Core/UIImage+MemoryCacheCost.m b/SDWebImage/Core/UIImage+MemoryCacheCost.m
new file mode 100644
index 000000000..b9365009b
--- /dev/null
+++ b/SDWebImage/Core/UIImage+MemoryCacheCost.m
@@ -0,0 +1,47 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "UIImage+MemoryCacheCost.h"
+#import "objc/runtime.h"
+#import "NSImage+Compatibility.h"
+
+FOUNDATION_STATIC_INLINE NSUInteger SDMemoryCacheCostForImage(UIImage *image) {
+    CGImageRef imageRef = image.CGImage;
+    if (!imageRef) {
+        return 0;
+    }
+    NSUInteger bytesPerFrame = CGImageGetBytesPerRow(imageRef) * CGImageGetHeight(imageRef);
+    NSUInteger frameCount;
+#if SD_MAC
+    frameCount = 1;
+#elif SD_UIKIT || SD_WATCH
+    // Filter the same frame in `_UIAnimatedImage`.
+    frameCount = image.images.count > 1 ? [NSSet setWithArray:image.images].count : 1;
+#endif
+    NSUInteger cost = bytesPerFrame * frameCount;
+    return cost;
+}
+
+@implementation UIImage (MemoryCacheCost)
+
+- (NSUInteger)sd_memoryCost {
+    NSNumber *value = objc_getAssociatedObject(self, @selector(sd_memoryCost));
+    NSUInteger memoryCost;
+    if (value != nil) {
+        memoryCost = [value unsignedIntegerValue];
+    } else {
+        memoryCost = SDMemoryCacheCostForImage(self);
+    }
+    return memoryCost;
+}
+
+- (void)setSd_memoryCost:(NSUInteger)sd_memoryCost {
+    objc_setAssociatedObject(self, @selector(sd_memoryCost), @(sd_memoryCost), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+}
+
+@end
diff --git a/SDWebImage/Core/UIImage+Metadata.h b/SDWebImage/Core/UIImage+Metadata.h
new file mode 100644
index 000000000..0aea1df76
--- /dev/null
+++ b/SDWebImage/Core/UIImage+Metadata.h
@@ -0,0 +1,104 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+#import "NSData+ImageContentType.h"
+#import "SDImageCoder.h"
+
+/**
+ UIImage category for image metadata, including animation, loop count, format, incremental, etc.
+ */
+@interface UIImage (Metadata)
+
+/**
+ * UIKit:
+ * For static image format, this value is always 0.
+ * For animated image format, 0 means infinite looping.
+ * Note that because of the limitations of categories this property can get out of sync if you create another instance with CGImage or other methods.
+ * AppKit:
+ * NSImage currently only support animated via `NSBitmapImageRep`(GIF) or `SDAnimatedImageRep`(APNG/GIF/WebP) unlike UIImage.
+ * The getter of this property will get the loop count from animated imageRep
+ * The setter of this property will set the loop count from animated imageRep
+ * SDAnimatedImage:
+ * Returns `animatedImageLoopCount`
+ */
+@property (nonatomic, assign) NSUInteger sd_imageLoopCount;
+
+/**
+ * UIKit:
+ * Returns the `images`'s count by unapply the patch for the different frame durations. Which matches the real visible frame count when displaying on UIImageView.
+ * See more in `SDImageCoderHelper.animatedImageWithFrames`.
+ * Returns 1 for static image.
+ * AppKit:
+ * Returns the underlaying `NSBitmapImageRep` or `SDAnimatedImageRep` frame count.
+ * Returns 1 for static image.
+ * SDAnimatedImage:
+ * Returns `animatedImageFrameCount` for animated image, 1 for static image.
+ */
+@property (nonatomic, assign, readonly) NSUInteger sd_imageFrameCount;
+
+/**
+ * UIKit:
+ * Check the `images` array property.
+ * AppKit:
+ * NSImage currently only support animated via GIF imageRep unlike UIImage. It will check the imageRep's frame count > 1.
+ * SDAnimatedImage:
+ * Check `animatedImageFrameCount` > 1
+ */
+@property (nonatomic, assign, readonly) BOOL sd_isAnimated;
+
+/**
+ * UIKit:
+ * Check the `isSymbolImage` property. Also check the system PDF(iOS 11+) && SVG(iOS 13+) support.
+ * AppKit:
+ * NSImage supports PDF && SVG && EPS imageRep, check the imageRep class.
+ * SDAnimatedImage:
+ * Returns `NO`
+ */
+@property (nonatomic, assign, readonly) BOOL sd_isVector;
+
+/**
+ * The image format represent the original compressed image data format.
+ * If you don't manually specify a format, this information is retrieve from CGImage using `CGImageGetUTType`, which may return nil for non-CG based image. At this time it will return `SDImageFormatUndefined` as default value.
+ * @note Note that because of the limitations of categories this property can get out of sync if you create another instance with CGImage or other methods.
+ * @note For `SDAnimatedImage`, returns `animatedImageFormat` when animated, or fallback when static.
+ */
+@property (nonatomic, assign) SDImageFormat sd_imageFormat;
+
+/**
+ A bool value indicating whether the image is during incremental decoding and may not contains full pixels.
+ */
+@property (nonatomic, assign) BOOL sd_isIncremental;
+
+/**
+ A bool value indicating that the image is transformed from original image, so the image data may not always match original download one.
+ */
+@property (nonatomic, assign) BOOL sd_isTransformed;
+
+/**
+ A bool value indicating that the image is using thumbnail decode with smaller size, so the image data may not always match original download one.
+ @note This just check `sd_decodeOptions[.decodeThumbnailPixelSize] > CGSize.zero`
+ */
+@property (nonatomic, assign, readonly) BOOL sd_isThumbnail;
+
+/**
+ A dictionary value contains the decode options when decoded from SDWebImage loading system (say, `SDImageCacheDecodeImageData/SDImageLoaderDecode[Progressive]ImageData`)
+ It may not always available and only image decoding related options will be saved. (including [.decodeScaleFactor, .decodeThumbnailPixelSize, .decodePreserveAspectRatio, .decodeFirstFrameOnly])
+ @note This is used to identify and check the image is from thumbnail decoding, and the callback's data **will be nil** (because this time the data saved to disk does not match the image return to you. If you need full size data, query the cache with full size url key)
+ @warning You should not store object inside which keep strong reference to image itself, which will cause retain cycle.
+ @warning This API exist only because of current SDWebImageDownloader bad design which does not callback the context we call it. There will be refactor in future (API break), use with caution.
+ */
+@property (nonatomic, copy) SDImageCoderOptions *sd_decodeOptions;
+
+/**
+ A bool value indicating that the image is using HDR
+ @note Only valid for CGImage based, for CIImage based, the returned value is not correct.
+ */
+@property (nonatomic, assign, readonly) BOOL sd_isHighDynamicRange;
+
+@end
diff --git a/SDWebImage/Core/UIImage+Metadata.m b/SDWebImage/Core/UIImage+Metadata.m
new file mode 100644
index 000000000..1e65c2b2a
--- /dev/null
+++ b/SDWebImage/Core/UIImage+Metadata.m
@@ -0,0 +1,236 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "UIImage+Metadata.h"
+#import "NSImage+Compatibility.h"
+#import "SDInternalMacros.h"
+#import "objc/runtime.h"
+#import "SDImageCoderHelper.h"
+
+@implementation UIImage (Metadata)
+
+#if SD_UIKIT || SD_WATCH
+
+- (NSUInteger)sd_imageLoopCount {
+    NSUInteger imageLoopCount = 0;
+    NSNumber *value = objc_getAssociatedObject(self, @selector(sd_imageLoopCount));
+    if ([value isKindOfClass:[NSNumber class]]) {
+        imageLoopCount = value.unsignedIntegerValue;
+    }
+    return imageLoopCount;
+}
+
+- (void)setSd_imageLoopCount:(NSUInteger)sd_imageLoopCount {
+    NSNumber *value = @(sd_imageLoopCount);
+    objc_setAssociatedObject(self, @selector(sd_imageLoopCount), value, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+}
+
+- (NSUInteger)sd_imageFrameCount {
+    NSArray<UIImage *> *animatedImages = self.images;
+    if (!animatedImages || animatedImages.count <= 1) {
+        return 1;
+    }
+    NSNumber *value = objc_getAssociatedObject(self, @selector(sd_imageFrameCount));
+    if ([value isKindOfClass:[NSNumber class]]) {
+        return [value unsignedIntegerValue];
+    }
+    __block NSUInteger frameCount = 1;
+    __block UIImage *previousImage = animatedImages.firstObject;
+    [animatedImages enumerateObjectsUsingBlock:^(UIImage * _Nonnull image, NSUInteger idx, BOOL * _Nonnull stop) {
+        // ignore first
+        if (idx == 0) {
+            return;
+        }
+        if (![image isEqual:previousImage]) {
+            frameCount++;
+        }
+        previousImage = image;
+    }];
+    objc_setAssociatedObject(self, @selector(sd_imageFrameCount), @(frameCount), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+    
+    return frameCount;
+}
+
+- (BOOL)sd_isAnimated {
+    return (self.images != nil);
+}
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
+- (BOOL)sd_isVector {
+    if (@available(iOS 13.0, tvOS 13.0, watchOS 6.0, *)) {
+        // Xcode 11 supports symbol image, keep Xcode 10 compatible currently
+        SEL SymbolSelector = NSSelectorFromString(@"isSymbolImage");
+        if ([self respondsToSelector:SymbolSelector] && [self performSelector:SymbolSelector]) {
+            return YES;
+        }
+        // SVG
+        SEL SVGSelector = SD_SEL_SPI(CGSVGDocument);
+        if ([self respondsToSelector:SVGSelector] && [self performSelector:SVGSelector]) {
+            return YES;
+        }
+    }
+    if (@available(iOS 11.0, tvOS 11.0, watchOS 4.0, *)) {
+        // PDF
+        SEL PDFSelector = SD_SEL_SPI(CGPDFPage);
+        if ([self respondsToSelector:PDFSelector] && [self performSelector:PDFSelector]) {
+            return YES;
+        }
+    }
+    return NO;
+}
+#pragma clang diagnostic pop
+
+#else
+
+- (NSUInteger)sd_imageLoopCount {
+    NSUInteger imageLoopCount = 0;
+    NSRect imageRect = NSMakeRect(0, 0, self.size.width, self.size.height);
+    NSImageRep *imageRep = [self bestRepresentationForRect:imageRect context:nil hints:nil];
+    NSBitmapImageRep *bitmapImageRep;
+    if ([imageRep isKindOfClass:[NSBitmapImageRep class]]) {
+        bitmapImageRep = (NSBitmapImageRep *)imageRep;
+    }
+    if (bitmapImageRep) {
+        imageLoopCount = [[bitmapImageRep valueForProperty:NSImageLoopCount] unsignedIntegerValue];
+    }
+    return imageLoopCount;
+}
+
+- (void)setSd_imageLoopCount:(NSUInteger)sd_imageLoopCount {
+    NSRect imageRect = NSMakeRect(0, 0, self.size.width, self.size.height);
+    NSImageRep *imageRep = [self bestRepresentationForRect:imageRect context:nil hints:nil];
+    NSBitmapImageRep *bitmapImageRep;
+    if ([imageRep isKindOfClass:[NSBitmapImageRep class]]) {
+        bitmapImageRep = (NSBitmapImageRep *)imageRep;
+    }
+    if (bitmapImageRep) {
+        [bitmapImageRep setProperty:NSImageLoopCount withValue:@(sd_imageLoopCount)];
+    }
+}
+
+- (NSUInteger)sd_imageFrameCount {
+    NSRect imageRect = NSMakeRect(0, 0, self.size.width, self.size.height);
+    NSImageRep *imageRep = [self bestRepresentationForRect:imageRect context:nil hints:nil];
+    NSBitmapImageRep *bitmapImageRep;
+    if ([imageRep isKindOfClass:[NSBitmapImageRep class]]) {
+        bitmapImageRep = (NSBitmapImageRep *)imageRep;
+    }
+    if (bitmapImageRep) {
+        return [[bitmapImageRep valueForProperty:NSImageFrameCount] unsignedIntegerValue];
+    }
+    return 1;
+}
+
+- (BOOL)sd_isAnimated {
+    BOOL isAnimated = NO;
+    NSRect imageRect = NSMakeRect(0, 0, self.size.width, self.size.height);
+    NSImageRep *imageRep = [self bestRepresentationForRect:imageRect context:nil hints:nil];
+    NSBitmapImageRep *bitmapImageRep;
+    if ([imageRep isKindOfClass:[NSBitmapImageRep class]]) {
+        bitmapImageRep = (NSBitmapImageRep *)imageRep;
+    }
+    if (bitmapImageRep) {
+        NSUInteger frameCount = [[bitmapImageRep valueForProperty:NSImageFrameCount] unsignedIntegerValue];
+        isAnimated = frameCount > 1 ? YES : NO;
+    }
+    return isAnimated;
+}
+
+- (BOOL)sd_isVector {
+    NSRect imageRect = NSMakeRect(0, 0, self.size.width, self.size.height);
+    // This may returns a NSProxy, so don't use `class` to check
+    NSImageRep *imageRep = [self bestRepresentationForRect:imageRect context:nil hints:nil];
+    if ([imageRep isKindOfClass:[NSPDFImageRep class]]) {
+        return YES;
+    }
+    if ([imageRep isKindOfClass:[NSEPSImageRep class]]) {
+        return YES;
+    }
+    Class NSSVGImageRepClass = NSClassFromString([NSString stringWithFormat:@"_%@", SD_NSSTRING(NSSVGImageRep)]);
+    if ([imageRep isKindOfClass:NSSVGImageRepClass]) {
+        return YES;
+    }
+    return NO;
+}
+
+#endif
+
+- (SDImageFormat)sd_imageFormat {
+    SDImageFormat imageFormat = SDImageFormatUndefined;
+    NSNumber *value = objc_getAssociatedObject(self, @selector(sd_imageFormat));
+    if ([value isKindOfClass:[NSNumber class]]) {
+        imageFormat = value.integerValue;
+        return imageFormat;
+    }
+    // Check CGImage's UTType, may return nil for non-Image/IO based image
+    CFStringRef uttype = CGImageGetUTType(self.CGImage);
+    imageFormat = [NSData sd_imageFormatFromUTType:uttype];
+    return imageFormat;
+}
+
+- (void)setSd_imageFormat:(SDImageFormat)sd_imageFormat {
+    objc_setAssociatedObject(self, @selector(sd_imageFormat), @(sd_imageFormat), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+}
+
+- (void)setSd_isIncremental:(BOOL)sd_isIncremental {
+    objc_setAssociatedObject(self, @selector(sd_isIncremental), @(sd_isIncremental), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+}
+
+- (BOOL)sd_isIncremental {
+    NSNumber *value = objc_getAssociatedObject(self, @selector(sd_isIncremental));
+    return value.boolValue;
+}
+
+- (void)setSd_isTransformed:(BOOL)sd_isTransformed {
+    objc_setAssociatedObject(self, @selector(sd_isTransformed), @(sd_isTransformed), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+}
+
+- (BOOL)sd_isTransformed {
+    NSNumber *value = objc_getAssociatedObject(self, @selector(sd_isTransformed));
+    return value.boolValue;
+}
+
+- (void)setSd_decodeOptions:(SDImageCoderOptions *)sd_decodeOptions {
+    objc_setAssociatedObject(self, @selector(sd_decodeOptions), sd_decodeOptions, OBJC_ASSOCIATION_COPY_NONATOMIC);
+}
+
+-(BOOL)sd_isThumbnail {
+    CGSize thumbnailSize = CGSizeZero;
+    NSValue *thumbnailSizeValue = self.sd_decodeOptions[SDImageCoderDecodeThumbnailPixelSize];
+    if (thumbnailSizeValue != nil) {
+    #if SD_MAC
+        thumbnailSize = thumbnailSizeValue.sizeValue;
+    #else
+        thumbnailSize = thumbnailSizeValue.CGSizeValue;
+    #endif
+    }
+    return thumbnailSize.width > 0 && thumbnailSize.height > 0;
+}
+
+- (SDImageCoderOptions *)sd_decodeOptions {
+    SDImageCoderOptions *value = objc_getAssociatedObject(self, @selector(sd_decodeOptions));
+    if ([value isKindOfClass:NSDictionary.class]) {
+        return value;
+    }
+    return nil;
+}
+
+- (BOOL)sd_isHighDynamicRange {
+#if SD_MAC
+    return [SDImageCoderHelper CGImageIsHDR:self.CGImage];
+#else
+    if (@available(iOS 17, tvOS 17, watchOS 10, *)) {
+        return self.isHighDynamicRange;
+    } else {
+        return [SDImageCoderHelper CGImageIsHDR:self.CGImage];
+    }
+#endif
+}
+
+@end
diff --git a/SDWebImage/Core/UIImage+MultiFormat.h b/SDWebImage/Core/UIImage+MultiFormat.h
new file mode 100644
index 000000000..e495c747b
--- /dev/null
+++ b/SDWebImage/Core/UIImage+MultiFormat.h
@@ -0,0 +1,81 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+#import "NSData+ImageContentType.h"
+
+/**
+ UIImage category for convenient image format decoding/encoding.
+ */
+@interface UIImage (MultiFormat)
+#pragma mark - Decode
+/**
+ Create and decode a image with the specify image data
+
+ @param data The image data
+ @return The created image
+ */
++ (nullable UIImage *)sd_imageWithData:(nullable NSData *)data;
+
+/**
+ Create and decode a image with the specify image data and scale
+ 
+ @param data The image data
+ @param scale The image scale factor. Should be greater than or equal to 1.0.
+ @return The created image
+ */
++ (nullable UIImage *)sd_imageWithData:(nullable NSData *)data scale:(CGFloat)scale;
+
+/**
+ Create and decode a image with the specify image data and scale, allow specify animate/static control
+ 
+ @param data The image data
+ @param scale The image scale factor. Should be greater than or equal to 1.0.
+ @param firstFrameOnly Even if the image data is animated image format, decode the first frame only as static image.
+ @return The created image
+ */
++ (nullable UIImage *)sd_imageWithData:(nullable NSData *)data scale:(CGFloat)scale firstFrameOnly:(BOOL)firstFrameOnly;
+
+#pragma mark - Encode
+/**
+ Encode the current image to the data, the image format is unspecified
+
+ @note If the receiver is `SDAnimatedImage`, this will return the animated image data if available. No more extra encoding process.
+ @note For macOS, if the receiver contains only `SDAnimatedImageRep`, this will return the animated image data if available. No more extra encoding process.
+ @return The encoded data. If can't encode, return nil
+ */
+- (nullable NSData *)sd_imageData;
+
+/**
+ Encode the current image to data with the specify image format
+
+ @param imageFormat The specify image format
+ @return The encoded data. If can't encode, return nil
+ */
+- (nullable NSData *)sd_imageDataAsFormat:(SDImageFormat)imageFormat NS_SWIFT_NAME(sd_imageData(as:));
+
+/**
+ Encode the current image to data with the specify image format and compression quality
+
+ @param imageFormat The specify image format
+ @param compressionQuality The quality of the resulting image data. Value between 0.0-1.0. Some coders may not support compression quality.
+ @return The encoded data. If can't encode, return nil
+ */
+- (nullable NSData *)sd_imageDataAsFormat:(SDImageFormat)imageFormat compressionQuality:(double)compressionQuality NS_SWIFT_NAME(sd_imageData(as:compressionQuality:));
+
+/**
+ Encode the current image to data with the specify image format and compression quality, allow specify animate/static control
+ 
+ @param imageFormat The specify image format
+ @param compressionQuality The quality of the resulting image data. Value between 0.0-1.0. Some coders may not support compression quality.
+ @param firstFrameOnly Even if the image is animated image, encode the first frame only as static image.
+ @return The encoded data. If can't encode, return nil
+ */
+- (nullable NSData *)sd_imageDataAsFormat:(SDImageFormat)imageFormat compressionQuality:(double)compressionQuality firstFrameOnly:(BOOL)firstFrameOnly NS_SWIFT_NAME(sd_imageData(as:compressionQuality:firstFrameOnly:));
+
+@end
diff --git a/SDWebImage/Core/UIImage+MultiFormat.m b/SDWebImage/Core/UIImage+MultiFormat.m
new file mode 100644
index 000000000..a569477c5
--- /dev/null
+++ b/SDWebImage/Core/UIImage+MultiFormat.m
@@ -0,0 +1,61 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "UIImage+MultiFormat.h"
+#import "SDImageCodersManager.h"
+#import "SDAnimatedImageRep.h"
+#import "UIImage+Metadata.h"
+
+@implementation UIImage (MultiFormat)
+
++ (nullable UIImage *)sd_imageWithData:(nullable NSData *)data {
+    return [self sd_imageWithData:data scale:1];
+}
+
++ (nullable UIImage *)sd_imageWithData:(nullable NSData *)data scale:(CGFloat)scale {
+    return [self sd_imageWithData:data scale:scale firstFrameOnly:NO];
+}
+
++ (nullable UIImage *)sd_imageWithData:(nullable NSData *)data scale:(CGFloat)scale firstFrameOnly:(BOOL)firstFrameOnly {
+    if (!data) {
+        return nil;
+    }
+    SDImageCoderOptions *options = @{SDImageCoderDecodeScaleFactor : @(MAX(scale, 1)), SDImageCoderDecodeFirstFrameOnly : @(firstFrameOnly)};
+    return [[SDImageCodersManager sharedManager] decodedImageWithData:data options:options];
+}
+
+- (nullable NSData *)sd_imageData {
+#if SD_MAC
+    NSRect imageRect = NSMakeRect(0, 0, self.size.width, self.size.height);
+    NSImageRep *imageRep = [self bestRepresentationForRect:imageRect context:nil hints:nil];
+    // Check weak animated data firstly
+    if ([imageRep isKindOfClass:[SDAnimatedImageRep class]]) {
+        SDAnimatedImageRep *animatedImageRep = (SDAnimatedImageRep *)imageRep;
+        NSData *imageData = [animatedImageRep animatedImageData];
+        if (imageData) {
+            return imageData;
+        }
+    }
+#endif
+    return [self sd_imageDataAsFormat:self.sd_imageFormat];
+}
+
+- (nullable NSData *)sd_imageDataAsFormat:(SDImageFormat)imageFormat {
+    return [self sd_imageDataAsFormat:imageFormat compressionQuality:1];
+}
+
+- (nullable NSData *)sd_imageDataAsFormat:(SDImageFormat)imageFormat compressionQuality:(double)compressionQuality {
+    return [self sd_imageDataAsFormat:imageFormat compressionQuality:compressionQuality firstFrameOnly:NO];
+}
+
+- (nullable NSData *)sd_imageDataAsFormat:(SDImageFormat)imageFormat compressionQuality:(double)compressionQuality firstFrameOnly:(BOOL)firstFrameOnly {
+    SDImageCoderOptions *options = @{SDImageCoderEncodeCompressionQuality : @(compressionQuality), SDImageCoderEncodeFirstFrameOnly : @(firstFrameOnly)};
+    return [[SDImageCodersManager sharedManager] encodedDataWithImage:self format:imageFormat options:options];
+}
+
+@end
diff --git a/SDWebImage/Core/UIImage+Transform.h b/SDWebImage/Core/UIImage+Transform.h
new file mode 100644
index 000000000..245c66eb4
--- /dev/null
+++ b/SDWebImage/Core/UIImage+Transform.h
@@ -0,0 +1,164 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+
+/// The scale mode to apply when image drawing on a container with different sizes.
+typedef NS_ENUM(NSUInteger, SDImageScaleMode) {
+    /// The option to scale the content to fit the size of itself by changing the aspect ratio of the content if necessary.
+    SDImageScaleModeFill = 0,
+    /// The option to scale the content to fit the size of the view by maintaining the aspect ratio. Any remaining area of the view’s bounds is transparent.
+    SDImageScaleModeAspectFit = 1,
+    /// The option to scale the content to fill the size of the view. Some portion of the content may be clipped to fill the view’s bounds.
+    SDImageScaleModeAspectFill = 2
+};
+
+#if SD_UIKIT || SD_WATCH
+typedef UIRectCorner SDRectCorner;
+#else
+typedef NS_OPTIONS(NSUInteger, SDRectCorner) {
+    SDRectCornerTopLeft     = 1 << 0,
+    SDRectCornerTopRight    = 1 << 1,
+    SDRectCornerBottomLeft  = 1 << 2,
+    SDRectCornerBottomRight = 1 << 3,
+    SDRectCornerAllCorners  = ~0UL
+};
+#endif
+
+/**
+ Provide some common method for `UIImage`.
+ Image process is based on Core Graphics and vImage.
+ */
+@interface UIImage (Transform)
+
+#pragma mark - Image Geometry
+
+/**
+ Returns a new image which is resized from this image.
+ You can specify a larger or smaller size than the image size. The image content will be changed with the scale mode.
+ 
+ @param size        The new size to be resized, values should be positive.
+ @param scaleMode   The scale mode for image content.
+ @return The new image with the given size.
+ */
+- (nullable UIImage *)sd_resizedImageWithSize:(CGSize)size scaleMode:(SDImageScaleMode)scaleMode;
+
+/**
+ Returns a new image which is cropped from this image.
+ 
+ @param rect     Image's inner rect.
+ @return         The new image with the cropping rect.
+ */
+- (nullable UIImage *)sd_croppedImageWithRect:(CGRect)rect;
+
+/**
+ Rounds a new image with a given corner radius and corners.
+ 
+ @param cornerRadius The radius of each corner oval. Values larger than half the
+ rectangle's width or height are clamped appropriately to
+ half the width or height.
+ @param corners      A bitmask value that identifies the corners that you want
+ rounded. You can use this parameter to round only a subset
+ of the corners of the rectangle.
+ @param borderWidth  The inset border line width. Values larger than half the rectangle's
+ width or height are clamped appropriately to half the width
+ or height.
+ @param borderColor  The border stroke color. nil means clear color.
+ @return The new image with the round corner.
+ */
+- (nullable UIImage *)sd_roundedCornerImageWithRadius:(CGFloat)cornerRadius
+                                              corners:(SDRectCorner)corners
+                                          borderWidth:(CGFloat)borderWidth
+                                          borderColor:(nullable UIColor *)borderColor;
+
+/**
+ Returns a new rotated image (relative to the center).
+ 
+ @param angle     Rotated radians in counterclockwise.⟲
+ @param fitSize   YES: new image's size is extend to fit all content.
+                  NO: image's size will not change, content may be clipped.
+ @return The new image with the rotation.
+ */
+- (nullable UIImage *)sd_rotatedImageWithAngle:(CGFloat)angle fitSize:(BOOL)fitSize;
+
+/**
+ Returns a new horizontally(vertically) flipped image.
+ 
+ @param horizontal YES to flip the image horizontally. ⇋
+ @param vertical YES to flip the image vertically. ⥯
+ @return The new image with the flipping.
+ */
+- (nullable UIImage *)sd_flippedImageWithHorizontal:(BOOL)horizontal vertical:(BOOL)vertical;
+
+#pragma mark - Image Blending
+
+/**
+ Return a tinted image with the given color. This actually use `sourceIn` blend mode.
+ @note Before 5.20, this API actually use `sourceAtop` and cause naming confusing. After 5.20, we match UIKit's behavior using `sourceIn`.
+ 
+ @param tintColor  The tint color.
+ @return The new image with the tint color.
+ */
+- (nullable UIImage *)sd_tintedImageWithColor:(nonnull UIColor *)tintColor;
+
+/**
+ Return a tinted image with the given color and blend mode.
+ @note The blend mode treat `self` as background image (destination), treat `tintColor` as input image (source). So mostly you need `source` variant blend mode (use `sourceIn` not `destinationIn`), which is different from UIKit's `+[UIImage imageWithTintColor:]`.
+ 
+ @param tintColor  The tint color.
+ @param blendMode The blend mode.
+ @return The new image with the tint color.
+ */
+- (nullable UIImage *)sd_tintedImageWithColor:(nonnull UIColor *)tintColor blendMode:(CGBlendMode)blendMode;
+
+/**
+ Return the pixel color at specify position. The point is from the top-left to the bottom-right and 0-based. The returned the color is always be RGBA format. The image must be CG-based.
+ @note The point's x/y will be converted into integer.
+ @note The point's x/y should not be smaller than 0, or greater than or equal to width/height.
+ @note The overhead of object creation means this method is best suited for infrequent color sampling. For heavy image processing, grab the raw bitmap data and process yourself.
+
+ @param point The position of pixel
+ @warning This API currently support 8 bits per component only (RGBA8888 etc), not RGBA16U/RGBA10
+ @return The color for specify pixel, or nil if any error occur
+ */
+- (nullable UIColor *)sd_colorAtPoint:(CGPoint)point;
+
+/**
+ Return the pixel color array with specify rectangle. The rect is from the top-left to the bottom-right and 0-based. The returned the color is always be RGBA format. The image must be CG-based.
+ @note The rect's origin and size will be converted into integer.
+ @note The rect's width/height should not be smaller than or equal to 0. The minX/minY should not be smaller than 0. The maxX/maxY should not be greater than width/height. Attention this limit is different from `sd_colorAtPoint:` (point: (0, 0) like rect: (0, 0, 1, 1))
+ @note The overhead of object creation means this method is best suited for infrequent color sampling. For heavy image processing, grab the raw bitmap data and process yourself.
+
+ @param rect The rectangle of pixels
+ @return The color array for specify pixels, or nil if any error occur
+ */
+- (nullable NSArray<UIColor *> *)sd_colorsWithRect:(CGRect)rect;
+
+#pragma mark - Image Effect
+
+/**
+ Return a new image applied a blur effect.
+ 
+ @param blurRadius     The radius of the blur in points, 0 means no blur effect.
+ 
+ @return               The new image with blur effect, or nil if an error occurs (e.g. no enough memory).
+ */
+- (nullable UIImage *)sd_blurredImageWithRadius:(CGFloat)blurRadius;
+
+#if SD_UIKIT || SD_MAC
+/**
+ Return a new image applied a CIFilter.
+
+ @param filter The CIFilter to be applied to the image.
+ @return The new image with the CIFilter, or nil if an error occurs (e.g. no
+ enough memory).
+ */
+- (nullable UIImage *)sd_filteredImageWithFilter:(nonnull CIFilter *)filter;
+#endif
+
+@end
diff --git a/SDWebImage/Core/UIImage+Transform.m b/SDWebImage/Core/UIImage+Transform.m
new file mode 100644
index 000000000..88189be82
--- /dev/null
+++ b/SDWebImage/Core/UIImage+Transform.m
@@ -0,0 +1,1064 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "UIImage+Transform.h"
+#import "NSImage+Compatibility.h"
+#import "SDImageGraphics.h"
+#import "SDGraphicsImageRenderer.h"
+#import "NSBezierPath+SDRoundedCorners.h"
+#import "SDInternalMacros.h"
+#import <Accelerate/Accelerate.h>
+#if SD_UIKIT || SD_MAC
+#import <CoreImage/CoreImage.h>
+#endif
+
+static inline CGRect SDCGRectFitWithScaleMode(CGRect rect, CGSize size, SDImageScaleMode scaleMode) {
+    rect = CGRectStandardize(rect);
+    size.width = size.width < 0 ? -size.width : size.width;
+    size.height = size.height < 0 ? -size.height : size.height;
+    CGPoint center = CGPointMake(CGRectGetMidX(rect), CGRectGetMidY(rect));
+    switch (scaleMode) {
+        case SDImageScaleModeAspectFit:
+        case SDImageScaleModeAspectFill: {
+            if (rect.size.width < 0.01 || rect.size.height < 0.01 ||
+                size.width < 0.01 || size.height < 0.01) {
+                rect.origin = center;
+                rect.size = CGSizeZero;
+            } else {
+                CGFloat scale;
+                if (scaleMode == SDImageScaleModeAspectFit) {
+                    if (size.width / size.height < rect.size.width / rect.size.height) {
+                        scale = rect.size.height / size.height;
+                    } else {
+                        scale = rect.size.width / size.width;
+                    }
+                } else {
+                    if (size.width / size.height < rect.size.width / rect.size.height) {
+                        scale = rect.size.width / size.width;
+                    } else {
+                        scale = rect.size.height / size.height;
+                    }
+                }
+                size.width *= scale;
+                size.height *= scale;
+                rect.size = size;
+                rect.origin = CGPointMake(center.x - size.width * 0.5, center.y - size.height * 0.5);
+            }
+        } break;
+        case SDImageScaleModeFill:
+        default: {
+            rect = rect;
+        }
+    }
+    return rect;
+}
+
+static inline UIColor * SDGetColorFromGrayscale(Pixel_88 pixel, CGBitmapInfo bitmapInfo, CGColorSpaceRef cgColorSpace) {
+    // Get alpha info, byteOrder info
+    CGImageAlphaInfo alphaInfo = bitmapInfo & kCGBitmapAlphaInfoMask;
+    CGBitmapInfo byteOrderInfo = bitmapInfo & kCGBitmapByteOrderMask;
+    CGFloat w = 0, a = 1;
+    
+    BOOL byteOrderNormal = NO;
+    switch (byteOrderInfo) {
+        case kCGBitmapByteOrderDefault: {
+            byteOrderNormal = YES;
+        } break;
+        case kCGBitmapByteOrder16Little:
+        case kCGBitmapByteOrder32Little: {
+        } break;
+        case kCGBitmapByteOrder16Big:
+        case kCGBitmapByteOrder32Big: {
+            byteOrderNormal = YES;
+        } break;
+        default: break;
+    }
+    switch (alphaInfo) {
+        case kCGImageAlphaPremultipliedFirst:
+        case kCGImageAlphaFirst: {
+            if (byteOrderNormal) {
+                // AW
+                a = pixel[0] / 255.0;
+                w = pixel[1] / 255.0;
+            } else {
+                // WA
+                w = pixel[0] / 255.0;
+                a = pixel[1] / 255.0;
+            }
+        }
+            break;
+        case kCGImageAlphaPremultipliedLast:
+        case kCGImageAlphaLast: {
+            if (byteOrderNormal) {
+                // WA
+                w = pixel[0] / 255.0;
+                a = pixel[1] / 255.0;
+            } else {
+                // AW
+                a = pixel[0] / 255.0;
+                w = pixel[1] / 255.0;
+            }
+        }
+            break;
+        case kCGImageAlphaNone: {
+            // W
+            w = pixel[0] / 255.0;
+        }
+            break;
+        case kCGImageAlphaNoneSkipLast: {
+            if (byteOrderNormal) {
+                // WX
+                w = pixel[0] / 255.0;
+            } else {
+                // XW
+                a = pixel[1] / 255.0;
+            }
+        }
+            break;
+        case kCGImageAlphaNoneSkipFirst: {
+            if (byteOrderNormal) {
+                // XW
+                a = pixel[1] / 255.0;
+            } else {
+                // WX
+                a = pixel[0] / 255.0;
+            }
+        }
+            break;
+        case kCGImageAlphaOnly: {
+            // A
+            a = pixel[0] / 255.0;
+        }
+            break;
+        default:
+            break;
+    }
+#if SD_MAC
+    // Mac supports ColorSync, to ensure the same bahvior, we convert color to sRGB
+    NSColorSpace *colorSpace = [[NSColorSpace alloc] initWithCGColorSpace:cgColorSpace];
+    CGFloat components[2] = {w, a};
+    NSColor *color = [NSColor colorWithColorSpace:colorSpace components:components count:2];
+    return [color colorUsingColorSpace:NSColorSpace.genericGamma22GrayColorSpace];
+#else
+    return [UIColor colorWithWhite:w alpha:a];
+#endif
+}
+
+static inline UIColor * SDGetColorFromRGBA8(Pixel_8888 pixel, CGBitmapInfo bitmapInfo, CGColorSpaceRef cgColorSpace) {
+    // Get alpha info, byteOrder info
+    CGImageAlphaInfo alphaInfo = bitmapInfo & kCGBitmapAlphaInfoMask;
+    CGBitmapInfo byteOrderInfo = bitmapInfo & kCGBitmapByteOrderMask;
+    CGFloat r = 0, g = 0, b = 0, a = 1;
+    
+    BOOL byteOrderNormal = NO;
+    switch (byteOrderInfo) {
+        case kCGBitmapByteOrderDefault: {
+            byteOrderNormal = YES;
+        } break;
+        case kCGBitmapByteOrder16Little:
+        case kCGBitmapByteOrder32Little: {
+        } break;
+        case kCGBitmapByteOrder16Big:
+        case kCGBitmapByteOrder32Big: {
+            byteOrderNormal = YES;
+        } break;
+        default: break;
+    }
+    switch (alphaInfo) {
+        case kCGImageAlphaPremultipliedFirst: {
+            if (byteOrderNormal) {
+                // ARGB8888-premultiplied
+                a = pixel[0] / 255.0;
+                r = pixel[1] / 255.0;
+                g = pixel[2] / 255.0;
+                b = pixel[3] / 255.0;
+                if (a > 0) {
+                    r /= a;
+                    g /= a;
+                    b /= a;
+                }
+            } else {
+                // BGRA8888-premultiplied
+                b = pixel[0] / 255.0;
+                g = pixel[1] / 255.0;
+                r = pixel[2] / 255.0;
+                a = pixel[3] / 255.0;
+                if (a > 0) {
+                    r /= a;
+                    g /= a;
+                    b /= a;
+                }
+            }
+            break;
+        }
+        case kCGImageAlphaFirst: {
+            if (byteOrderNormal) {
+                // ARGB8888
+                a = pixel[0] / 255.0;
+                r = pixel[1] / 255.0;
+                g = pixel[2] / 255.0;
+                b = pixel[3] / 255.0;
+            } else {
+                // BGRA8888
+                b = pixel[0] / 255.0;
+                g = pixel[1] / 255.0;
+                r = pixel[2] / 255.0;
+                a = pixel[3] / 255.0;
+            }
+        }
+            break;
+        case kCGImageAlphaPremultipliedLast: {
+            if (byteOrderNormal) {
+                // RGBA8888-premultiplied
+                r = pixel[0] / 255.0;
+                g = pixel[1] / 255.0;
+                b = pixel[2] / 255.0;
+                a = pixel[3] / 255.0;
+                if (a > 0) {
+                    r /= a;
+                    g /= a;
+                    b /= a;
+                }
+            } else {
+                // ABGR8888-premultiplied
+                a = pixel[0] / 255.0;
+                b = pixel[1] / 255.0;
+                g = pixel[2] / 255.0;
+                r = pixel[3] / 255.0;
+                if (a > 0) {
+                    r /= a;
+                    g /= a;
+                    b /= a;
+                }
+            }
+            break;
+        }
+        case kCGImageAlphaLast: {
+            if (byteOrderNormal) {
+                // RGBA8888
+                r = pixel[0] / 255.0;
+                g = pixel[1] / 255.0;
+                b = pixel[2] / 255.0;
+                a = pixel[3] / 255.0;
+            } else {
+                // ABGR8888
+                a = pixel[0] / 255.0;
+                b = pixel[1] / 255.0;
+                g = pixel[2] / 255.0;
+                r = pixel[3] / 255.0;
+            }
+        }
+            break;
+        case kCGImageAlphaNone: {
+            if (byteOrderNormal) {
+                // RGB
+                r = pixel[0] / 255.0;
+                g = pixel[1] / 255.0;
+                b = pixel[2] / 255.0;
+            } else {
+                // BGR
+                b = pixel[0] / 255.0;
+                g = pixel[1] / 255.0;
+                r = pixel[2] / 255.0;
+            }
+        }
+            break;
+        case kCGImageAlphaNoneSkipLast: {
+            if (byteOrderNormal) {
+                // RGBX
+                r = pixel[0] / 255.0;
+                g = pixel[1] / 255.0;
+                b = pixel[2] / 255.0;
+            } else {
+                // XBGR
+                b = pixel[1] / 255.0;
+                g = pixel[2] / 255.0;
+                r = pixel[3] / 255.0;
+            }
+        }
+            break;
+        case kCGImageAlphaNoneSkipFirst: {
+            if (byteOrderNormal) {
+                // XRGB
+                r = pixel[1] / 255.0;
+                g = pixel[2] / 255.0;
+                b = pixel[3] / 255.0;
+            } else {
+                // BGRX
+                b = pixel[0] / 255.0;
+                g = pixel[1] / 255.0;
+                r = pixel[2] / 255.0;
+            }
+        }
+            break;
+        case kCGImageAlphaOnly: {
+            // A
+            a = pixel[0] / 255.0;
+        }
+            break;
+        default:
+            break;
+    }
+#if SD_MAC
+    // Mac supports ColorSync, to ensure the same bahvior, we convert color to sRGB
+    NSColorSpace *colorSpace = [[NSColorSpace alloc] initWithCGColorSpace:cgColorSpace];
+    CGFloat components[4] = {r, g, b, a};
+    NSColor *color = [NSColor colorWithColorSpace:colorSpace components:components count:4];
+    return [color colorUsingColorSpace:NSColorSpace.sRGBColorSpace];
+#else
+    return [UIColor colorWithRed:r green:g blue:b alpha:a];
+#endif
+}
+
+#if SD_UIKIT || SD_MAC
+// Create-Rule, caller should call CGImageRelease
+static inline CGImageRef _Nullable SDCreateCGImageFromCIImage(CIImage * _Nonnull ciImage) {
+    CGImageRef imageRef = NULL;
+    if (@available(iOS 10, macOS 10.12, tvOS 10, *)) {
+        imageRef = ciImage.CGImage;
+    }
+    if (!imageRef) {
+        CIContext *context = [CIContext context];
+        imageRef = [context createCGImage:ciImage fromRect:ciImage.extent];
+    } else {
+        CGImageRetain(imageRef);
+    }
+    return imageRef;
+}
+#endif
+
+@implementation UIImage (Transform)
+
+- (void)sd_drawInRect:(CGRect)rect context:(CGContextRef)context scaleMode:(SDImageScaleMode)scaleMode clipsToBounds:(BOOL)clips {
+    CGRect drawRect = SDCGRectFitWithScaleMode(rect, self.size, scaleMode);
+    if (drawRect.size.width == 0 || drawRect.size.height == 0) return;
+    if (clips) {
+        if (context) {
+            CGContextSaveGState(context);
+            CGContextAddRect(context, rect);
+            CGContextClip(context);
+            [self drawInRect:drawRect];
+            CGContextRestoreGState(context);
+        }
+    } else {
+        [self drawInRect:drawRect];
+    }
+}
+
+- (nullable UIImage *)sd_resizedImageWithSize:(CGSize)size scaleMode:(SDImageScaleMode)scaleMode {
+    if (size.width <= 0 || size.height <= 0) return nil;
+    SDGraphicsImageRendererFormat *format = [[SDGraphicsImageRendererFormat alloc] init];
+    format.scale = self.scale;
+    SDGraphicsImageRenderer *renderer = [[SDGraphicsImageRenderer alloc] initWithSize:size format:format];
+    UIImage *image = [renderer imageWithActions:^(CGContextRef  _Nonnull context) {
+        [self sd_drawInRect:CGRectMake(0, 0, size.width, size.height) context:context scaleMode:scaleMode clipsToBounds:NO];
+    }];
+    return image;
+}
+
+- (nullable UIImage *)sd_croppedImageWithRect:(CGRect)rect {
+    rect.origin.x *= self.scale;
+    rect.origin.y *= self.scale;
+    rect.size.width *= self.scale;
+    rect.size.height *= self.scale;
+    if (rect.size.width <= 0 || rect.size.height <= 0) return nil;
+    
+#if SD_UIKIT || SD_MAC
+    // CIImage shortcut
+    if (self.CIImage) {
+        CGRect croppingRect = CGRectMake(rect.origin.x, self.size.height - CGRectGetMaxY(rect), rect.size.width, rect.size.height);
+        CIImage *ciImage = [self.CIImage imageByCroppingToRect:croppingRect];
+#if SD_UIKIT
+        UIImage *image = [UIImage imageWithCIImage:ciImage scale:self.scale orientation:self.imageOrientation];
+#else
+        UIImage *image = [[UIImage alloc] initWithCIImage:ciImage scale:self.scale orientation:kCGImagePropertyOrientationUp];
+#endif
+        return image;
+    }
+#endif
+    
+    CGImageRef imageRef = self.CGImage;
+    if (!imageRef) {
+        return nil;
+    }
+    
+    CGImageRef croppedImageRef = CGImageCreateWithImageInRect(imageRef, rect);
+    if (!croppedImageRef) {
+        return nil;
+    }
+#if SD_UIKIT || SD_WATCH
+    UIImage *image = [UIImage imageWithCGImage:croppedImageRef scale:self.scale orientation:self.imageOrientation];
+#else
+    UIImage *image = [[UIImage alloc] initWithCGImage:croppedImageRef scale:self.scale orientation:kCGImagePropertyOrientationUp];
+#endif
+    CGImageRelease(croppedImageRef);
+    return image;
+}
+
+- (nullable UIImage *)sd_roundedCornerImageWithRadius:(CGFloat)cornerRadius corners:(SDRectCorner)corners borderWidth:(CGFloat)borderWidth borderColor:(nullable UIColor *)borderColor {
+    SDGraphicsImageRendererFormat *format = [[SDGraphicsImageRendererFormat alloc] init];
+    format.scale = self.scale;
+    SDGraphicsImageRenderer *renderer = [[SDGraphicsImageRenderer alloc] initWithSize:self.size format:format];
+    UIImage *image = [renderer imageWithActions:^(CGContextRef  _Nonnull context) {
+        CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height);
+        
+        CGFloat minSize = MIN(self.size.width, self.size.height);
+        if (borderWidth < minSize / 2) {
+#if SD_UIKIT || SD_WATCH
+            UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:CGRectInset(rect, borderWidth, borderWidth) byRoundingCorners:corners cornerRadii:CGSizeMake(cornerRadius, cornerRadius)];
+#else
+            NSBezierPath *path = [NSBezierPath sd_bezierPathWithRoundedRect:CGRectInset(rect, borderWidth, borderWidth) byRoundingCorners:corners cornerRadius:cornerRadius];
+#endif
+            [path closePath];
+            
+            CGContextSaveGState(context);
+            [path addClip];
+            [self drawInRect:rect];
+            CGContextRestoreGState(context);
+        }
+        
+        if (borderColor && borderWidth < minSize / 2 && borderWidth > 0) {
+            CGFloat strokeInset = (floor(borderWidth * self.scale) + 0.5) / self.scale;
+            CGRect strokeRect = CGRectInset(rect, strokeInset, strokeInset);
+            CGFloat strokeRadius = cornerRadius > self.scale / 2 ? cornerRadius - self.scale / 2 : 0;
+#if SD_UIKIT || SD_WATCH
+            UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:strokeRect byRoundingCorners:corners cornerRadii:CGSizeMake(strokeRadius, strokeRadius)];
+#else
+            NSBezierPath *path = [NSBezierPath sd_bezierPathWithRoundedRect:strokeRect byRoundingCorners:corners cornerRadius:strokeRadius];
+#endif
+            [path closePath];
+            
+            path.lineWidth = borderWidth;
+            [borderColor setStroke];
+            [path stroke];
+        }
+    }];
+    return image;
+}
+
+- (nullable UIImage *)sd_rotatedImageWithAngle:(CGFloat)angle fitSize:(BOOL)fitSize {
+    size_t width = self.size.width;
+    size_t height = self.size.height;
+    CGRect newRect = CGRectApplyAffineTransform(CGRectMake(0, 0, width, height),
+                                                fitSize ? CGAffineTransformMakeRotation(angle) : CGAffineTransformIdentity);
+
+#if SD_UIKIT || SD_MAC
+    // CIImage shortcut
+    if (self.CIImage) {
+        CIImage *ciImage = self.CIImage;
+        if (fitSize) {
+            CGAffineTransform transform = CGAffineTransformMakeRotation(angle);
+            ciImage = [ciImage imageByApplyingTransform:transform];
+        } else {
+            CIFilter *filter = [CIFilter filterWithName:@"CIStraightenFilter"];
+            [filter setValue:ciImage forKey:kCIInputImageKey];
+            [filter setValue:@(angle) forKey:kCIInputAngleKey];
+            ciImage = filter.outputImage;
+        }
+#if SD_UIKIT || SD_WATCH
+        UIImage *image = [UIImage imageWithCIImage:ciImage scale:self.scale orientation:self.imageOrientation];
+#else
+        UIImage *image = [[UIImage alloc] initWithCIImage:ciImage scale:self.scale orientation:kCGImagePropertyOrientationUp];
+#endif
+        return image;
+    }
+#endif
+    
+    SDGraphicsImageRendererFormat *format = [[SDGraphicsImageRendererFormat alloc] init];
+    format.scale = self.scale;
+    SDGraphicsImageRenderer *renderer = [[SDGraphicsImageRenderer alloc] initWithSize:newRect.size format:format];
+    UIImage *image = [renderer imageWithActions:^(CGContextRef  _Nonnull context) {
+        CGContextSetShouldAntialias(context, true);
+        CGContextSetAllowsAntialiasing(context, true);
+        CGContextSetInterpolationQuality(context, kCGInterpolationHigh);
+        CGContextTranslateCTM(context, +(newRect.size.width * 0.5), +(newRect.size.height * 0.5));
+#if SD_UIKIT || SD_WATCH
+        // Use UIKit coordinate system counterclockwise (⟲)
+        CGContextRotateCTM(context, -angle);
+#else
+        CGContextRotateCTM(context, angle);
+#endif
+        
+        [self drawInRect:CGRectMake(-(width * 0.5), -(height * 0.5), width, height)];
+    }];
+    return image;
+}
+
+- (nullable UIImage *)sd_flippedImageWithHorizontal:(BOOL)horizontal vertical:(BOOL)vertical {
+    size_t width = self.size.width;
+    size_t height = self.size.height;
+
+#if SD_UIKIT || SD_MAC
+    // CIImage shortcut
+    if (self.CIImage) {
+        CGAffineTransform transform = CGAffineTransformIdentity;
+        // Use UIKit coordinate system
+        if (horizontal) {
+            CGAffineTransform flipHorizontal = CGAffineTransformMake(-1, 0, 0, 1, width, 0);
+            transform = CGAffineTransformConcat(transform, flipHorizontal);
+        }
+        if (vertical) {
+            CGAffineTransform flipVertical = CGAffineTransformMake(1, 0, 0, -1, 0, height);
+            transform = CGAffineTransformConcat(transform, flipVertical);
+        }
+        CIImage *ciImage = [self.CIImage imageByApplyingTransform:transform];
+#if SD_UIKIT
+        UIImage *image = [UIImage imageWithCIImage:ciImage scale:self.scale orientation:self.imageOrientation];
+#else
+        UIImage *image = [[UIImage alloc] initWithCIImage:ciImage scale:self.scale orientation:kCGImagePropertyOrientationUp];
+#endif
+        return image;
+    }
+#endif
+    
+    SDGraphicsImageRendererFormat *format = [[SDGraphicsImageRendererFormat alloc] init];
+    format.scale = self.scale;
+    SDGraphicsImageRenderer *renderer = [[SDGraphicsImageRenderer alloc] initWithSize:self.size format:format];
+    UIImage *image = [renderer imageWithActions:^(CGContextRef  _Nonnull context) {
+        // Use UIKit coordinate system
+        if (horizontal) {
+            CGAffineTransform flipHorizontal = CGAffineTransformMake(-1, 0, 0, 1, width, 0);
+            CGContextConcatCTM(context, flipHorizontal);
+        }
+        if (vertical) {
+            CGAffineTransform flipVertical = CGAffineTransformMake(1, 0, 0, -1, 0, height);
+            CGContextConcatCTM(context, flipVertical);
+        }
+        [self drawInRect:CGRectMake(0, 0, width, height)];
+    }];
+    return image;
+}
+
+#pragma mark - Image Blending
+
+#if SD_UIKIT || SD_MAC
+static NSString * _Nullable SDGetCIFilterNameFromBlendMode(CGBlendMode blendMode) {
+    // CGBlendMode: https://developer.apple.com/library/archive/documentation/GraphicsImaging/Conceptual/drawingwithquartz2d/dq_images/dq_images.html#//apple_ref/doc/uid/TP30001066-CH212-CJBIJEFG
+    // CIFilter: https://developer.apple.com/library/archive/documentation/GraphicsImaging/Reference/CoreImageFilterReference/index.html#//apple_ref/doc/uid/TP30000136-SW71
+    NSString *filterName;
+    switch (blendMode) {
+        case kCGBlendModeMultiply:
+            filterName = @"CIMultiplyBlendMode";
+            break;
+        case kCGBlendModeScreen:
+            filterName = @"CIScreenBlendMode";
+            break;
+        case kCGBlendModeOverlay:
+            filterName = @"CIOverlayBlendMode";
+            break;
+        case kCGBlendModeDarken:
+            filterName = @"CIDarkenBlendMode";
+            break;
+        case kCGBlendModeLighten:
+            filterName = @"CILightenBlendMode";
+            break;
+        case kCGBlendModeColorDodge:
+            filterName = @"CIColorDodgeBlendMode";
+            break;
+        case kCGBlendModeColorBurn:
+            filterName = @"CIColorBurnBlendMode";
+            break;
+        case kCGBlendModeSoftLight:
+            filterName = @"CISoftLightBlendMode";
+            break;
+        case kCGBlendModeHardLight:
+            filterName = @"CIHardLightBlendMode";
+            break;
+        case kCGBlendModeDifference:
+            filterName = @"CIDifferenceBlendMode";
+            break;
+        case kCGBlendModeExclusion:
+            filterName = @"CIExclusionBlendMode";
+            break;
+        case kCGBlendModeHue:
+            filterName = @"CIHueBlendMode";
+            break;
+        case kCGBlendModeSaturation:
+            filterName = @"CISaturationBlendMode";
+            break;
+        case kCGBlendModeColor:
+            // Color blend mode uses the luminance values of the background with the hue and saturation values of the source image.
+            filterName = @"CIColorBlendMode";
+            break;
+        case kCGBlendModeLuminosity:
+            filterName = @"CILuminosityBlendMode";
+            break;
+            
+        // macOS 10.5+
+        case kCGBlendModeSourceAtop:
+        case kCGBlendModeDestinationAtop:
+            filterName = @"CISourceAtopCompositing";
+            break;
+        case kCGBlendModeSourceIn:
+        case kCGBlendModeDestinationIn:
+            filterName = @"CISourceInCompositing";
+            break;
+        case kCGBlendModeSourceOut:
+        case kCGBlendModeDestinationOut:
+            filterName = @"CISourceOutCompositing";
+            break;
+        case kCGBlendModeNormal: // SourceOver
+        case kCGBlendModeDestinationOver:
+            filterName = @"CISourceOverCompositing";
+            break;
+        
+        // need special handling
+        case kCGBlendModeClear:
+            // use clear color instead
+            break;
+        case kCGBlendModeCopy:
+            // use input color instead
+            break;
+        case kCGBlendModeXOR:
+            // unsupported
+            break;
+        case kCGBlendModePlusDarker:
+            // chain filters
+            break;
+        case kCGBlendModePlusLighter:
+            // chain filters
+            break;
+    }
+    return filterName;
+}
+#endif
+
+- (nullable UIImage *)sd_tintedImageWithColor:(nonnull UIColor *)tintColor {
+    return [self sd_tintedImageWithColor:tintColor blendMode:kCGBlendModeSourceIn];
+}
+
+- (nullable UIImage *)sd_tintedImageWithColor:(nonnull UIColor *)tintColor blendMode:(CGBlendMode)blendMode {
+    BOOL hasTint = CGColorGetAlpha(tintColor.CGColor) > __FLT_EPSILON__;
+    if (!hasTint) {
+        return self;
+    }
+    
+    // blend mode, see https://en.wikipedia.org/wiki/Alpha_compositing
+#if SD_UIKIT || SD_MAC
+    // CIImage shortcut
+    CIImage *ciImage = self.CIImage;
+    if (ciImage) {
+        CIImage *colorImage = [CIImage imageWithColor:[[CIColor alloc] initWithColor:tintColor]];
+        colorImage = [colorImage imageByCroppingToRect:ciImage.extent];
+        NSString *filterName = SDGetCIFilterNameFromBlendMode(blendMode);
+        // Some blend mode is not nativelly supported
+        if (filterName) {
+            CIFilter *filter = [CIFilter filterWithName:filterName];
+            [filter setValue:colorImage forKey:kCIInputImageKey];
+            [filter setValue:ciImage forKey:kCIInputBackgroundImageKey];
+            ciImage = filter.outputImage;
+        } else {
+            if (blendMode == kCGBlendModeClear) {
+                // R = 0
+                CIColor *clearColor;
+                if (@available(iOS 10.0, macOS 10.12, tvOS 10.0, *)) {
+                    clearColor = CIColor.clearColor;
+                } else {
+                    clearColor = [[CIColor alloc] initWithColor:UIColor.clearColor];
+                }
+                colorImage = [CIImage imageWithColor:clearColor];
+                colorImage = [colorImage imageByCroppingToRect:ciImage.extent];
+                ciImage = colorImage;
+            } else if (blendMode == kCGBlendModeCopy) {
+                // R = S
+                ciImage = colorImage;
+            } else if (blendMode == kCGBlendModePlusLighter) {
+                // R = MIN(1, S + D)
+                // S + D
+                CIFilter *filter = [CIFilter filterWithName:@"CIAdditionCompositing"];
+                [filter setValue:colorImage forKey:kCIInputImageKey];
+                [filter setValue:ciImage forKey:kCIInputBackgroundImageKey];
+                ciImage = filter.outputImage;
+                // MIN
+                ciImage = [ciImage imageByApplyingFilter:@"CIColorClamp" withInputParameters:nil];
+            } else if (blendMode == kCGBlendModePlusDarker) {
+                // R = MAX(0, (1 - D) + (1 - S))
+                // (1 - D)
+                CIFilter *filter1 = [CIFilter filterWithName:@"CIColorControls"];
+                [filter1 setValue:ciImage forKey:kCIInputImageKey];
+                [filter1 setValue:@(-0.5) forKey:kCIInputBrightnessKey];
+                ciImage = filter1.outputImage;
+                // (1 - S)
+                CIFilter *filter2 = [CIFilter filterWithName:@"CIColorControls"];
+                [filter2 setValue:colorImage forKey:kCIInputImageKey];
+                [filter2 setValue:@(-0.5) forKey:kCIInputBrightnessKey];
+                colorImage = filter2.outputImage;
+                // +
+                CIFilter *filter = [CIFilter filterWithName:@"CIAdditionCompositing"];
+                [filter setValue:colorImage forKey:kCIInputImageKey];
+                [filter setValue:ciImage forKey:kCIInputBackgroundImageKey];
+                ciImage = filter.outputImage;
+                // MAX
+                ciImage = [ciImage imageByApplyingFilter:@"CIColorClamp" withInputParameters:nil];
+            } else {
+                SD_LOG("UIImage+Transform error: Unsupported blend mode: %d", blendMode);
+                ciImage = nil;
+            }
+        }
+        
+        if (ciImage) {
+#if SD_UIKIT
+        UIImage *image = [UIImage imageWithCIImage:ciImage scale:self.scale orientation:self.imageOrientation];
+#else
+        UIImage *image = [[UIImage alloc] initWithCIImage:ciImage scale:self.scale orientation:kCGImagePropertyOrientationUp];
+#endif
+        return image;
+        }
+    }
+#endif
+    
+    CGSize size = self.size;
+    CGRect rect = { CGPointZero, size };
+    CGFloat scale = self.scale;
+    
+    SDGraphicsImageRendererFormat *format = [[SDGraphicsImageRendererFormat alloc] init];
+    format.scale = scale;
+    SDGraphicsImageRenderer *renderer = [[SDGraphicsImageRenderer alloc] initWithSize:size format:format];
+    UIImage *image = [renderer imageWithActions:^(CGContextRef  _Nonnull context) {
+        [self drawInRect:rect];
+        CGContextSetBlendMode(context, blendMode);
+        CGContextSetFillColorWithColor(context, tintColor.CGColor);
+        CGContextFillRect(context, rect);
+    }];
+    return image;
+}
+
+- (nullable UIColor *)sd_colorAtPoint:(CGPoint)point {
+    CGImageRef imageRef = NULL;
+    // CIImage compatible
+#if SD_UIKIT || SD_MAC
+    if (self.CIImage) {
+        imageRef = SDCreateCGImageFromCIImage(self.CIImage);
+    }
+#endif
+    if (!imageRef) {
+        imageRef = self.CGImage;
+        CGImageRetain(imageRef);
+    }
+    if (!imageRef) {
+        return nil;
+    }
+    
+    // Check point
+    size_t width = CGImageGetWidth(imageRef);
+    size_t height = CGImageGetHeight(imageRef);
+    size_t x = point.x;
+    size_t y = point.y;
+    if (x < 0 || y < 0 || x >= width || y >= height) {
+        CGImageRelease(imageRef);
+        return nil;
+    }
+    
+    // Check pixel format
+    CGBitmapInfo bitmapInfo = CGImageGetBitmapInfo(imageRef);
+    size_t bitsPerComponent = CGImageGetBitsPerComponent(imageRef);
+    if (@available(iOS 12.0, tvOS 12.0, macOS 10.14, watchOS 5.0, *)) {
+        CGImagePixelFormatInfo pixelFormat = (bitmapInfo & kCGImagePixelFormatMask);
+        if (pixelFormat != kCGImagePixelFormatPacked || bitsPerComponent > 8) {
+            // like RGBA1010102, need bitwise to extract pixel from single uint32_t, we don't support currently
+            SD_LOG("Unsupported pixel format: %u, bpc: %zu for CGImage: %@", pixelFormat, bitsPerComponent, imageRef);
+            CGImageRelease(imageRef);
+            return nil;
+        }
+    }
+    
+    // Get pixels
+    CGDataProviderRef provider = CGImageGetDataProvider(imageRef);
+    if (!provider) {
+        CGImageRelease(imageRef);
+        return nil;
+    }
+    CFDataRef data = CGDataProviderCopyData(provider);
+    if (!data) {
+        CGImageRelease(imageRef);
+        return nil;
+    }
+    
+    // Get pixel at point
+    size_t bytesPerRow = CGImageGetBytesPerRow(imageRef);
+    size_t components = CGImageGetBitsPerPixel(imageRef) / bitsPerComponent;
+    
+    CFRange range = CFRangeMake(bytesPerRow * y + components * x, components);
+    if (CFDataGetLength(data) < range.location + range.length) {
+        CFRelease(data);
+        CGImageRelease(imageRef);
+        return nil;
+    }
+    // Get color space for transform
+    CGColorSpaceRef colorSpace = CGImageGetColorSpace(imageRef);
+    
+    // greyscale
+    if (components == 2) {
+        Pixel_88 pixel = {0};
+        CFDataGetBytes(data, range, pixel);
+        CFRelease(data);
+        CGImageRelease(imageRef);
+        // Convert to color
+        return SDGetColorFromGrayscale(pixel, bitmapInfo, colorSpace);
+    } else if (components == 3 || components == 4) {
+        // RGB/RGBA
+        Pixel_8888 pixel = {0};
+        CFDataGetBytes(data, range, pixel);
+        CFRelease(data);
+        CGImageRelease(imageRef);
+        // Convert to color
+        return SDGetColorFromRGBA8(pixel, bitmapInfo, colorSpace);
+    } else {
+        SD_LOG("Unsupported components: %zu for CGImage: %@", components, imageRef);
+        CFRelease(data);
+        CGImageRelease(imageRef);
+        return nil;
+    }
+}
+
+- (nullable NSArray<UIColor *> *)sd_colorsWithRect:(CGRect)rect {
+    CGImageRef imageRef = NULL;
+    // CIImage compatible
+#if SD_UIKIT || SD_MAC
+    if (self.CIImage) {
+        imageRef = SDCreateCGImageFromCIImage(self.CIImage);
+    }
+#endif
+    if (!imageRef) {
+        imageRef = self.CGImage;
+        CGImageRetain(imageRef);
+    }
+    if (!imageRef) {
+        return nil;
+    }
+    
+    // Check rect
+    size_t width = CGImageGetWidth(imageRef);
+    size_t height = CGImageGetHeight(imageRef);
+    if (CGRectGetWidth(rect) <= 0 || CGRectGetHeight(rect) <= 0 || CGRectGetMinX(rect) < 0 || CGRectGetMinY(rect) < 0 || CGRectGetMaxX(rect) > width || CGRectGetMaxY(rect) > height) {
+        CGImageRelease(imageRef);
+        return nil;
+    }
+    
+    // Check pixel format
+    CGBitmapInfo bitmapInfo = CGImageGetBitmapInfo(imageRef);
+    size_t bitsPerComponent = CGImageGetBitsPerComponent(imageRef);
+    if (@available(iOS 12.0, tvOS 12.0, macOS 10.14, watchOS 5.0, *)) {
+        CGImagePixelFormatInfo pixelFormat = (bitmapInfo & kCGImagePixelFormatMask);
+        if (pixelFormat != kCGImagePixelFormatPacked || bitsPerComponent > 8) {
+            // like RGBA1010102, need bitwise to extract pixel from single uint32_t, we don't support currently
+            SD_LOG("Unsupported pixel format: %u, bpc: %zu for CGImage: %@", pixelFormat, bitsPerComponent, imageRef);
+            CGImageRelease(imageRef);
+            return nil;
+        }
+    }
+    
+    // Get pixels
+    CGDataProviderRef provider = CGImageGetDataProvider(imageRef);
+    if (!provider) {
+        CGImageRelease(imageRef);
+        return nil;
+    }
+    CFDataRef data = CGDataProviderCopyData(provider);
+    if (!data) {
+        CGImageRelease(imageRef);
+        return nil;
+    }
+    
+    // Get pixels with rect
+    size_t bytesPerRow = CGImageGetBytesPerRow(imageRef);
+    size_t components = CGImageGetBitsPerPixel(imageRef) / bitsPerComponent;
+    
+    size_t start = bytesPerRow * CGRectGetMinY(rect) + components * CGRectGetMinX(rect);
+    size_t end = bytesPerRow * (CGRectGetMaxY(rect) - 1) + components * CGRectGetMaxX(rect);
+    if (CFDataGetLength(data) < (CFIndex)end) {
+        CFRelease(data);
+        CGImageRelease(imageRef);
+        return nil;
+    }
+    
+    const UInt8 *pixels = CFDataGetBytePtr(data);
+    size_t row = CGRectGetMinY(rect);
+    size_t col = CGRectGetMaxX(rect);
+    
+    // Convert to color
+    NSMutableArray<UIColor *> *colors = [NSMutableArray arrayWithCapacity:CGRectGetWidth(rect) * CGRectGetHeight(rect)];
+    // ColorSpace
+    CGColorSpaceRef colorSpace = CGImageGetColorSpace(imageRef);
+    for (size_t index = start; index < end; index += components) {
+        if (index >= row * bytesPerRow + col * components) {
+            // Index beyond the end of current row, go next row
+            row++;
+            index = row * bytesPerRow + CGRectGetMinX(rect) * components;
+            index -= components;
+            continue;
+        }
+        UIColor *color;
+        if (components == 2) {
+            Pixel_88 pixel = {pixels[index], pixel[index+1]};
+            color = SDGetColorFromGrayscale(pixel, bitmapInfo, colorSpace);
+        } else {
+            if (components == 3) {
+                Pixel_8888 pixel = {pixels[index], pixels[index+1], pixels[index+2], 0};
+                color = SDGetColorFromRGBA8(pixel, bitmapInfo, colorSpace);
+            } else if (components == 4) {
+                Pixel_8888 pixel = {pixels[index], pixels[index+1], pixels[index+2], pixels[index+3]};
+                color = SDGetColorFromRGBA8(pixel, bitmapInfo, colorSpace);
+            } else {
+                SD_LOG("Unsupported components: %zu for CGImage: %@", components, imageRef);
+                break;
+            }
+        }
+        if (color) {
+            [colors addObject:color];
+        }
+    }
+    CFRelease(data);
+    CGImageRelease(imageRef);
+    
+    return [colors copy];
+}
+
+#pragma mark - Image Effect
+
+// We use vImage to do box convolve for performance and support for watchOS. However, you can just use `CIFilter.CIGaussianBlur`. For other blur effect, use any filter in `CICategoryBlur`
+- (nullable UIImage *)sd_blurredImageWithRadius:(CGFloat)blurRadius {
+    if (self.size.width < 1 || self.size.height < 1) {
+        return nil;
+    }
+    BOOL hasBlur = blurRadius > __FLT_EPSILON__;
+    if (!hasBlur) {
+        return self;
+    }
+    
+    CGFloat scale = self.scale;
+    CGFloat inputRadius = blurRadius * scale;
+#if SD_UIKIT || SD_MAC
+    if (self.CIImage) {
+        CIFilter *filter = [CIFilter filterWithName:@"CIGaussianBlur"];
+        [filter setValue:self.CIImage forKey:kCIInputImageKey];
+        [filter setValue:@(inputRadius) forKey:kCIInputRadiusKey];
+        CIImage *ciImage = filter.outputImage;
+        ciImage = [ciImage imageByCroppingToRect:CGRectMake(0, 0, self.size.width, self.size.height)];
+#if SD_UIKIT
+        UIImage *image = [UIImage imageWithCIImage:ciImage scale:self.scale orientation:self.imageOrientation];
+#else
+        UIImage *image = [[UIImage alloc] initWithCIImage:ciImage scale:self.scale orientation:kCGImagePropertyOrientationUp];
+#endif
+        return image;
+    }
+#endif
+    
+    CGImageRef imageRef = self.CGImage;
+    if (!imageRef) {
+        return nil;
+    }
+    
+    vImage_Buffer effect = {}, scratch = {};
+    vImage_Buffer *input = NULL, *output = NULL;
+    
+    vImage_CGImageFormat format = {
+        .bitsPerComponent = 8,
+        .bitsPerPixel = 32,
+        .colorSpace = NULL,
+        .bitmapInfo = kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host, //requests a BGRA buffer.
+        .version = 0,
+        .decode = NULL,
+        .renderingIntent = CGImageGetRenderingIntent(imageRef)
+    };
+    
+    vImage_Error err;
+    err = vImageBuffer_InitWithCGImage(&effect, &format, NULL, imageRef, kvImageNoFlags); // vImage will convert to format we requests, no need `vImageConvert`
+    if (err != kvImageNoError) {
+        SD_LOG("UIImage+Transform error: vImageBuffer_InitWithCGImage returned error code %zi for inputImage: %@", err, self);
+        return nil;
+    }
+    err = vImageBuffer_Init(&scratch, effect.height, effect.width, format.bitsPerPixel, kvImageNoFlags);
+    if (err != kvImageNoError) {
+        SD_LOG("UIImage+Transform error: vImageBuffer_Init returned error code %zi for inputImage: %@", err, self);
+        return nil;
+    }
+    
+    input = &effect;
+    output = &scratch;
+    
+    // See: https://developer.apple.com/library/archive/samplecode/UIImageEffects/Introduction/Intro.html
+    if (hasBlur) {
+        // A description of how to compute the box kernel width from the Gaussian
+        // radius (aka standard deviation) appears in the SVG spec:
+        // http://www.w3.org/TR/SVG/filters.html#feGaussianBlurElement
+        //
+        // For larger values of 's' (s >= 2.0), an approximation can be used: Three
+        // successive box-blurs build a piece-wise quadratic convolution kernel, which
+        // approximates the Gaussian kernel to within roughly 3%.
+        //
+        // let d = floor(s * 3*sqrt(2*pi)/4 + 0.5)
+        //
+        // ... if d is odd, use three box-blurs of size 'd', centered on the output pixel.
+        //
+        if (inputRadius - 2.0 < __FLT_EPSILON__) inputRadius = 2.0;
+        uint32_t radius = floor(inputRadius * 3.0 * sqrt(2 * M_PI) / 4 + 0.5);
+        radius |= 1; // force radius to be odd so that the three box-blur methodology works.
+        NSInteger tempSize = vImageBoxConvolve_ARGB8888(input, output, NULL, 0, 0, radius, radius, NULL, kvImageGetTempBufferSize | kvImageEdgeExtend);
+        void *temp = malloc(tempSize);
+        vImageBoxConvolve_ARGB8888(input, output, temp, 0, 0, radius, radius, NULL, kvImageEdgeExtend);
+        vImageBoxConvolve_ARGB8888(output, input, temp, 0, 0, radius, radius, NULL, kvImageEdgeExtend);
+        vImageBoxConvolve_ARGB8888(input, output, temp, 0, 0, radius, radius, NULL, kvImageEdgeExtend);
+        free(temp);
+        
+        vImage_Buffer *tmp = input;
+        input = output;
+        output = tmp;
+    }
+    
+    CGImageRef effectCGImage = NULL;
+    effectCGImage = vImageCreateCGImageFromBuffer(input, &format, NULL, NULL, kvImageNoAllocate, NULL);
+    if (effectCGImage == NULL) {
+        effectCGImage = vImageCreateCGImageFromBuffer(input, &format, NULL, NULL, kvImageNoFlags, NULL);
+        free(input->data);
+    }
+    free(output->data);
+#if SD_UIKIT || SD_WATCH
+    UIImage *outputImage = [UIImage imageWithCGImage:effectCGImage scale:self.scale orientation:self.imageOrientation];
+#else
+    UIImage *outputImage = [[UIImage alloc] initWithCGImage:effectCGImage scale:self.scale orientation:kCGImagePropertyOrientationUp];
+#endif
+    CGImageRelease(effectCGImage);
+    
+    return outputImage;
+}
+
+#if SD_UIKIT || SD_MAC
+- (nullable UIImage *)sd_filteredImageWithFilter:(nonnull CIFilter *)filter {
+    CIImage *inputImage;
+    if (self.CIImage) {
+        inputImage = self.CIImage;
+    } else {
+        CGImageRef imageRef = self.CGImage;
+        if (!imageRef) {
+            return nil;
+        }
+        inputImage = [CIImage imageWithCGImage:imageRef];
+    }
+    if (!inputImage) return nil;
+    
+    CIContext *context = [CIContext context];
+    [filter setValue:inputImage forKey:kCIInputImageKey];
+    CIImage *outputImage = filter.outputImage;
+    if (!outputImage) return nil;
+    
+    CGImageRef imageRef = [context createCGImage:outputImage fromRect:outputImage.extent];
+    if (!imageRef) return nil;
+    
+#if SD_UIKIT
+    UIImage *image = [UIImage imageWithCGImage:imageRef scale:self.scale orientation:self.imageOrientation];
+#else
+    UIImage *image = [[UIImage alloc] initWithCGImage:imageRef scale:self.scale orientation:kCGImagePropertyOrientationUp];
+#endif
+    CGImageRelease(imageRef);
+    
+    return image;
+}
+#endif
+
+@end
diff --git a/SDWebImage/UIImageView+HighlightedWebCache.h b/SDWebImage/Core/UIImageView+HighlightedWebCache.h
similarity index 60%
rename from SDWebImage/UIImageView+HighlightedWebCache.h
rename to SDWebImage/Core/UIImageView+HighlightedWebCache.h
index c806e5f29..80fabc6d6 100644
--- a/SDWebImage/UIImageView+HighlightedWebCache.h
+++ b/SDWebImage/Core/UIImageView+HighlightedWebCache.h
@@ -17,6 +17,13 @@
  */
 @interface UIImageView (HighlightedWebCache)
 
+#pragma mark - Highlighted Image
+
+/**
+ * Get the current highlighted image URL.
+ */
+@property (nonatomic, strong, readonly, nullable) NSURL *sd_currentHighlightedImageURL;
+
 /**
  * Set the imageView `highlightedImage` with an `url`.
  *
@@ -37,6 +44,19 @@
 - (void)sd_setHighlightedImageWithURL:(nullable NSURL *)url
                               options:(SDWebImageOptions)options NS_REFINED_FOR_SWIFT;
 
+/**
+ * Set the imageView `highlightedImage` with an `url`, custom options and context.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url     The url for the image.
+ * @param options The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param context     A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
+ */
+- (void)sd_setHighlightedImageWithURL:(nullable NSURL *)url
+                              options:(SDWebImageOptions)options
+                              context:(nullable SDWebImageContext *)context;
+
 /**
  * Set the imageView `highlightedImage` with an `url`.
  *
@@ -86,9 +106,37 @@
  */
 - (void)sd_setHighlightedImageWithURL:(nullable NSURL *)url
                               options:(SDWebImageOptions)options
-                             progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                             progress:(nullable SDImageLoaderProgressBlock)progressBlock
                             completed:(nullable SDExternalCompletionBlock)completedBlock;
 
+/**
+ * Set the imageView `highlightedImage` with an `url`, custom options and context.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param options        The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param context     A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
+ * @param progressBlock  A block called while image is downloading
+ *                       @note the progress block is executed on a background queue
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setHighlightedImageWithURL:(nullable NSURL *)url
+                              options:(SDWebImageOptions)options
+                              context:(nullable SDWebImageContext *)context
+                             progress:(nullable SDImageLoaderProgressBlock)progressBlock
+                            completed:(nullable SDExternalCompletionBlock)completedBlock;
+
+/**
+ * Cancel the current highlighted image load (for `UIImageView.highlighted`)
+ * @note For normal image, use `sd_cancelCurrentImageLoad`
+ */
+- (void)sd_cancelCurrentHighlightedImageLoad;
+
 @end
 
 #endif
diff --git a/SDWebImage/Core/UIImageView+HighlightedWebCache.m b/SDWebImage/Core/UIImageView+HighlightedWebCache.m
new file mode 100644
index 000000000..58d810ff7
--- /dev/null
+++ b/SDWebImage/Core/UIImageView+HighlightedWebCache.m
@@ -0,0 +1,88 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "UIImageView+HighlightedWebCache.h"
+
+#if SD_UIKIT
+
+#import "UIView+WebCacheOperation.h"
+#import "UIView+WebCacheState.h"
+#import "UIView+WebCache.h"
+#import "SDInternalMacros.h"
+
+@implementation UIImageView (HighlightedWebCache)
+
+- (void)sd_setHighlightedImageWithURL:(nullable NSURL *)url {
+    [self sd_setHighlightedImageWithURL:url options:0 progress:nil completed:nil];
+}
+
+- (void)sd_setHighlightedImageWithURL:(nullable NSURL *)url options:(SDWebImageOptions)options {
+    [self sd_setHighlightedImageWithURL:url options:options progress:nil completed:nil];
+}
+
+- (void)sd_setHighlightedImageWithURL:(nullable NSURL *)url options:(SDWebImageOptions)options context:(nullable SDWebImageContext *)context {
+    [self sd_setHighlightedImageWithURL:url options:options context:context progress:nil completed:nil];
+}
+
+- (void)sd_setHighlightedImageWithURL:(nullable NSURL *)url completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setHighlightedImageWithURL:url options:0 progress:nil completed:completedBlock];
+}
+
+- (void)sd_setHighlightedImageWithURL:(nullable NSURL *)url options:(SDWebImageOptions)options completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setHighlightedImageWithURL:url options:options progress:nil completed:completedBlock];
+}
+
+- (void)sd_setHighlightedImageWithURL:(NSURL *)url options:(SDWebImageOptions)options progress:(nullable SDImageLoaderProgressBlock)progressBlock completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setHighlightedImageWithURL:url options:options context:nil progress:progressBlock completed:completedBlock];
+}
+
+- (void)sd_setHighlightedImageWithURL:(nullable NSURL *)url
+                              options:(SDWebImageOptions)options
+                              context:(nullable SDWebImageContext *)context
+                             progress:(nullable SDImageLoaderProgressBlock)progressBlock
+                            completed:(nullable SDExternalCompletionBlock)completedBlock {
+    @weakify(self);
+    SDWebImageMutableContext *mutableContext;
+    if (context) {
+        mutableContext = [context mutableCopy];
+    } else {
+        mutableContext = [NSMutableDictionary dictionary];
+    }
+    mutableContext[SDWebImageContextSetImageOperationKey] = @keypath(self, highlightedImage);
+    [self sd_internalSetImageWithURL:url
+                    placeholderImage:nil
+                             options:options
+                             context:mutableContext
+                       setImageBlock:^(UIImage * _Nullable image, NSData * _Nullable imageData, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+                           @strongify(self);
+                           if (!self) {
+                               return;
+                           }
+                           self.highlightedImage = image;
+                       }
+                            progress:progressBlock
+                           completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+                               if (completedBlock) {
+                                   completedBlock(image, error, cacheType, imageURL);
+                               }
+                           }];
+}
+
+#pragma mark - Highlighted State
+
+- (NSURL *)sd_currentHighlightedImageURL {
+    return [self sd_imageLoadStateForKey:@keypath(self, highlightedImage)].url;
+}
+
+- (void)sd_cancelCurrentHighlightedImageLoad {
+    return [self sd_cancelImageLoadOperationWithKey:@keypath(self, highlightedImage)];
+}
+
+@end
+
+#endif
diff --git a/SDWebImage/UIImageView+WebCache.h b/SDWebImage/Core/UIImageView+WebCache.h
similarity index 79%
rename from SDWebImage/UIImageView+WebCache.h
rename to SDWebImage/Core/UIImageView+WebCache.h
index d2992cba2..46b5a707d 100644
--- a/SDWebImage/UIImageView+WebCache.h
+++ b/SDWebImage/Core/UIImageView+WebCache.h
@@ -10,8 +10,6 @@
 #import "SDWebImageManager.h"
 
 /**
- * Integrates SDWebImage async downloading and caching of remote images with UIImageView.
- *
  * Usage with a UITableViewCell sub-class:
  *
  * @code
@@ -30,7 +28,7 @@
         cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:MyIdentifier];
     }
  
-    // Here we use the provided sd_setImageWithURL: method to load the web image
+    // Here we use the provided sd_setImageWithURL:placeholderImage: method to load the web image
     // Ensure you use a placeholder image otherwise cells will be initialized with no image
     [cell.imageView sd_setImageWithURL:[NSURL URLWithString:@"http://example.com/image.jpg"]
                       placeholderImage:[UIImage imageNamed:@"placeholder"]];
@@ -41,8 +39,21 @@
 
  * @endcode
  */
+
+/**
+ * Integrates SDWebImage async downloading and caching of remote images with UIImageView.
+ */
 @interface UIImageView (WebCache)
 
+#pragma mark - Image State
+
+/**
+ * Get the current image URL.
+ */
+@property (nonatomic, strong, readonly, nullable) NSURL *sd_currentImageURL;
+
+#pragma mark - Image Loading
+
 /**
  * Set the imageView `image` with an `url`.
  *
@@ -77,6 +88,21 @@
           placeholderImage:(nullable UIImage *)placeholder
                    options:(SDWebImageOptions)options NS_REFINED_FOR_SWIFT;
 
+/**
+ * Set the imageView `image` with an `url`, placeholder, custom options and context.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url         The url for the image.
+ * @param placeholder The image to be set initially, until the image request finishes.
+ * @param options     The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param context     A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+          placeholderImage:(nullable UIImage *)placeholder
+                   options:(SDWebImageOptions)options
+                   context:(nullable SDWebImageContext *)context;
+
 /**
  * Set the imageView `image` with an `url`.
  *
@@ -147,19 +173,18 @@
 - (void)sd_setImageWithURL:(nullable NSURL *)url
           placeholderImage:(nullable UIImage *)placeholder
                    options:(SDWebImageOptions)options
-                  progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                  progress:(nullable SDImageLoaderProgressBlock)progressBlock
                  completed:(nullable SDExternalCompletionBlock)completedBlock;
 
 /**
- * Set the imageView `image` with an `url` and custom options. The placeholder image is from previous cached image and will use the provided one instead if the query failed.
- * This method was designed to ensure that placeholder and query cache process happened in the same runloop to avoid flashing on cell during two `setImage:` call. But it's really misunderstanding and deprecated.
- * This can be done by using `sd_setImageWithURL:` with `SDWebImageQueryDiskSync`. But take care that if the memory cache missed, query disk cache synchronously may reduce the frame rate
+ * Set the imageView `image` with an `url`, placeholder, custom options and context.
  *
  * The download is asynchronous and cached.
  *
  * @param url            The url for the image.
  * @param placeholder    The image to be set initially, until the image request finishes.
  * @param options        The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param context        A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
  * @param progressBlock  A block called while image is downloading
  *                       @note the progress block is executed on a background queue
  * @param completedBlock A block called when operation has been completed. This block has no return value
@@ -167,27 +192,18 @@
  *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
  *                       indicating if the image was retrieved from the local cache or from the network.
  *                       The fourth parameter is the original image url.
- * @deprecated consider using `SDWebImageQueryDiskSync` options with `sd_setImageWithURL:` instead
  */
-- (void)sd_setImageWithPreviousCachedImageWithURL:(nullable NSURL *)url
-                                 placeholderImage:(nullable UIImage *)placeholder
-                                          options:(SDWebImageOptions)options
-                                         progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
-                                        completed:(nullable SDExternalCompletionBlock)completedBlock __deprecated_msg("This method is misunderstanding and deprecated, consider using `SDWebImageQueryDiskSync` options with `sd_setImageWithURL:` instead");
-
-#if SD_UIKIT
-
-#pragma mark - Animation of multiple images
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+          placeholderImage:(nullable UIImage *)placeholder
+                   options:(SDWebImageOptions)options
+                   context:(nullable SDWebImageContext *)context
+                  progress:(nullable SDImageLoaderProgressBlock)progressBlock
+                 completed:(nullable SDExternalCompletionBlock)completedBlock;
 
 /**
- * Download an array of images and starts them in an animation loop
- *
- * @param arrayOfURLs An array of NSURL
+ * Cancel the current normal image load (for `UIImageView.image`)
+ * @note For highlighted image, use `sd_cancelCurrentHighlightedImageLoad`
  */
-- (void)sd_setAnimationImagesWithURLs:(nonnull NSArray<NSURL *> *)arrayOfURLs;
-
-- (void)sd_cancelCurrentAnimationImagesLoad;
-
-#endif
+- (void)sd_cancelCurrentImageLoad;
 
 @end
diff --git a/SDWebImage/Core/UIImageView+WebCache.m b/SDWebImage/Core/UIImageView+WebCache.m
new file mode 100644
index 000000000..e461aeee8
--- /dev/null
+++ b/SDWebImage/Core/UIImageView+WebCache.m
@@ -0,0 +1,78 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "UIImageView+WebCache.h"
+#import "objc/runtime.h"
+#import "UIView+WebCacheOperation.h"
+#import "UIView+WebCacheState.h"
+#import "UIView+WebCache.h"
+
+@implementation UIImageView (WebCache)
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url {
+    [self sd_setImageWithURL:url placeholderImage:nil options:0 progress:nil completed:nil];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder {
+    [self sd_setImageWithURL:url placeholderImage:placeholder options:0 progress:nil completed:nil];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options {
+    [self sd_setImageWithURL:url placeholderImage:placeholder options:options progress:nil completed:nil];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options context:(nullable SDWebImageContext *)context {
+    [self sd_setImageWithURL:url placeholderImage:placeholder options:options context:context progress:nil completed:nil];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setImageWithURL:url placeholderImage:nil options:0 progress:nil completed:completedBlock];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setImageWithURL:url placeholderImage:placeholder options:0 progress:nil completed:completedBlock];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setImageWithURL:url placeholderImage:placeholder options:options progress:nil completed:completedBlock];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options progress:(nullable SDImageLoaderProgressBlock)progressBlock completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setImageWithURL:url placeholderImage:placeholder options:options context:nil progress:progressBlock completed:completedBlock];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+          placeholderImage:(nullable UIImage *)placeholder
+                   options:(SDWebImageOptions)options
+                   context:(nullable SDWebImageContext *)context
+                  progress:(nullable SDImageLoaderProgressBlock)progressBlock
+                 completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_internalSetImageWithURL:url
+                    placeholderImage:placeholder
+                             options:options
+                             context:context
+                       setImageBlock:nil
+                            progress:progressBlock
+                           completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+                               if (completedBlock) {
+                                   completedBlock(image, error, cacheType, imageURL);
+                               }
+                           }];
+}
+
+#pragma mark - State
+
+- (NSURL *)sd_currentImageURL {
+    return [self sd_imageLoadStateForKey:nil].url;
+}
+
+- (void)sd_cancelCurrentImageLoad {
+    return [self sd_cancelImageLoadOperationWithKey:nil];
+}
+
+@end
diff --git a/SDWebImage/Core/UIView+WebCache.h b/SDWebImage/Core/UIView+WebCache.h
new file mode 100644
index 000000000..2223f9d95
--- /dev/null
+++ b/SDWebImage/Core/UIView+WebCache.h
@@ -0,0 +1,131 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+#import "SDWebImageDefine.h"
+#import "SDWebImageManager.h"
+#import "SDWebImageTransition.h"
+#import "SDWebImageIndicator.h"
+#import "UIView+WebCacheOperation.h"
+#import "UIView+WebCacheState.h"
+
+/**
+ The value specify that the image progress unit count cannot be determined because the progressBlock is not been called.
+ */
+FOUNDATION_EXPORT const int64_t SDWebImageProgressUnitCountUnknown; /* 1LL */
+
+typedef void(^SDSetImageBlock)(UIImage * _Nullable image, NSData * _Nullable imageData, SDImageCacheType cacheType, NSURL * _Nullable imageURL);
+
+/**
+ Integrates SDWebImage async downloading and caching of remote images with UIView subclass.
+ */
+@interface UIView (WebCache)
+
+/**
+ * Get the current image operation key. Operation key is used to identify the different queries for one view instance (like UIButton).
+ * See more about this in `SDWebImageContextSetImageOperationKey`.
+ *
+ * @note You can use method `UIView+WebCacheOperation` to investigate different queries' operation.
+ * @note For the history version compatible, when current UIView has property exactly called `image`, the operation key will use `NSStringFromClass(self.class)`. Include `UIImageView.image/NSImageView.image/NSButton.image` (without `UIButton`)
+ * @warning This property should be only used for single state view, like `UIImageView` without highlighted state. For stateful view like `UIBUtton` (one view can have multiple images loading), check their header to call correct API, like `-[UIButton sd_imageOperationKeyForState:]`
+ */
+@property (nonatomic, strong, readonly, nullable) NSString *sd_latestOperationKey;
+
+#pragma mark - State
+
+/**
+ * Get the current image URL.
+ * This simply translate to `[self sd_imageLoadStateForKey:self.sd_latestOperationKey].url` from v5.18.0
+ *
+ * @note Note that because of the limitations of categories this property can get out of sync if you use setImage: directly.
+ * @warning This property should be only used for single state view, like `UIImageView` without highlighted state. For stateful view like `UIBUtton` (one view can have multiple images loading), use `sd_imageLoadStateForKey:` instead. See `UIView+WebCacheState.h` for more information.
+ */
+@property (nonatomic, strong, readonly, nullable) NSURL *sd_imageURL;
+
+/**
+ * The current image loading progress associated to the view. The unit count is the received size and excepted size of download.
+ * The `totalUnitCount` and `completedUnitCount` will be reset to 0 after a new image loading start (change from current queue). And they will be set to `SDWebImageProgressUnitCountUnknown` if the progressBlock not been called but the image loading success to mark the progress finished (change from main queue).
+ * @note You can use Key-Value Observing on the progress, but you should take care that the change to progress is from a background queue during download(the same as progressBlock). If you want to using KVO and update the UI, make sure to dispatch on the main queue. And it's recommend to use some KVO libs like KVOController because it's more safe and easy to use.
+ * @note The getter will create a progress instance if the value is nil. But by default, we don't create one. If you need to use Key-Value Observing, you must trigger the getter or set a custom progress instance before the loading start. The default value is nil.
+ * @note Note that because of the limitations of categories this property can get out of sync if you update the progress directly.
+ * @warning This property should be only used for single state view, like `UIImageView` without highlighted state. For stateful view like `UIBUtton` (one view can have multiple images loading), use `sd_imageLoadStateForKey:` instead. See `UIView+WebCacheState.h` for more information.
+ */
+@property (nonatomic, strong, null_resettable) NSProgress *sd_imageProgress;
+
+/**
+ * Set the imageView `image` with an `url` and optionally a placeholder image.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param placeholder    The image to be set initially, until the image request finishes.
+ * @param options        The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param context        A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
+ * @param setImageBlock  Block used for custom set image code. If not provide, use the built-in set image code (supports `UIImageView/NSImageView` and `UIButton/NSButton` currently)
+ * @param progressBlock  A block called while image is downloading
+ *                       @note the progress block is executed on a background queue
+ * @param completedBlock A block called when operation has been completed.
+ *   This block has no return value and takes the requested UIImage as first parameter and the NSData representation as second parameter.
+ *   In case of error the image parameter is nil and the third parameter may contain an NSError.
+ *
+ *   The forth parameter is an `SDImageCacheType` enum indicating if the image was retrieved from the local cache
+ *   or from the memory cache or from the network.
+ *
+ *   The fifth parameter normally is always YES. However, if you provide SDWebImageAvoidAutoSetImage with SDWebImageProgressiveLoad options to enable progressive downloading and set the image yourself. This block is thus called repeatedly with a partial image. When image is fully downloaded, the
+ *   block is called a last time with the full image and the last parameter set to YES.
+ *
+ *   The last parameter is the original image URL
+ *  @return The returned operation for cancelling cache and download operation, typically type is `SDWebImageCombinedOperation`
+ */
+- (nullable id<SDWebImageOperation>)sd_internalSetImageWithURL:(nullable NSURL *)url
+                                              placeholderImage:(nullable UIImage *)placeholder
+                                                       options:(SDWebImageOptions)options
+                                                       context:(nullable SDWebImageContext *)context
+                                                 setImageBlock:(nullable SDSetImageBlock)setImageBlock
+                                                      progress:(nullable SDImageLoaderProgressBlock)progressBlock
+                                                     completed:(nullable SDInternalCompletionBlock)completedBlock;
+
+/**
+ * Cancel the latest image load, using the `sd_latestOperationKey` as operation key
+ * This simply translate to `[self sd_cancelImageLoadOperationWithKey:self.sd_latestOperationKey]`
+ */
+- (void)sd_cancelLatestImageLoad;
+
+/**
+ * Cancel the current image load, for single state view.
+ * This actually does not cancel current loading, because stateful view can load multiple images at the same time (like UIButton, each state can load different images). Just behave the same as `sd_cancelLatestImageLoad`
+ *
+ * @warning This method should be only used for single state view, like `UIImageView` without highlighted state. For stateful view like `UIBUtton` (one view can have multiple images loading), use `sd_cancelImageLoadOperationWithKey:` instead. See `UIView+WebCacheOperation.h` for more information.
+ * @deprecated Use `sd_cancelLatestImageLoad` instead. Which don't cause overload method misunderstanding (`UIImageView+WebCache` provide the same API as this one, but does not do the same thing). This API will be totally removed in v6.0 due to this.
+ */
+- (void)sd_cancelCurrentImageLoad API_DEPRECATED_WITH_REPLACEMENT("sd_cancelLatestImageLoad", macos(10.10, 10.10), ios(8.0, 8.0), tvos(9.0, 9.0), watchos(2.0, 2.0));
+
+#if SD_UIKIT || SD_MAC
+
+#pragma mark - Image Transition
+
+/**
+ The image transition when image load finished. See `SDWebImageTransition`.
+ If you specify nil, do not do transition. Defaults to nil.
+ @warning This property should be only used for single state view, like `UIImageView` without highlighted state. For stateful view like `UIBUtton` (one view can have multiple images loading), write your own implementation in `setImageBlock:`, and check current stateful view's state to render the UI.
+ */
+@property (nonatomic, strong, nullable) SDWebImageTransition *sd_imageTransition;
+
+#pragma mark - Image Indicator
+
+/**
+ The image indicator during the image loading. If you do not need indicator, specify nil. Defaults to nil
+ The setter will remove the old indicator view and add new indicator view to current view's subview.
+ @note Because this is UI related, you should access only from the main queue.
+ @warning This property should be only used for single state view, like `UIImageView` without highlighted state. For stateful view like `UIBUtton` (one view can have multiple images loading), write your own implementation in `setImageBlock:`, and check current stateful view's state to render the UI.
+ */
+@property (nonatomic, strong, nullable) id<SDWebImageIndicator> sd_imageIndicator;
+
+#endif
+
+@end
diff --git a/SDWebImage/Core/UIView+WebCache.m b/SDWebImage/Core/UIView+WebCache.m
new file mode 100644
index 000000000..4a4984f72
--- /dev/null
+++ b/SDWebImage/Core/UIView+WebCache.m
@@ -0,0 +1,508 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "UIView+WebCache.h"
+#import "objc/runtime.h"
+#import "UIView+WebCacheOperation.h"
+#import "SDWebImageError.h"
+#import "SDInternalMacros.h"
+#import "SDWebImageTransitionInternal.h"
+#import "SDImageCache.h"
+#import "SDCallbackQueue.h"
+
+const int64_t SDWebImageProgressUnitCountUnknown = 1LL;
+
+@implementation UIView (WebCache)
+
+- (nullable NSString *)sd_latestOperationKey {
+    return objc_getAssociatedObject(self, @selector(sd_latestOperationKey));
+}
+
+- (void)setSd_latestOperationKey:(NSString * _Nullable)sd_latestOperationKey {
+    objc_setAssociatedObject(self, @selector(sd_latestOperationKey), sd_latestOperationKey, OBJC_ASSOCIATION_COPY_NONATOMIC);
+}
+
+#pragma mark - State
+
+- (NSURL *)sd_imageURL {
+    return [self sd_imageLoadStateForKey:self.sd_latestOperationKey].url;
+}
+
+- (NSProgress *)sd_imageProgress {
+    SDWebImageLoadState *loadState = [self sd_imageLoadStateForKey:self.sd_latestOperationKey];
+    NSProgress *progress = loadState.progress;
+    if (!progress) {
+        progress = [[NSProgress alloc] initWithParent:nil userInfo:nil];
+        self.sd_imageProgress = progress;
+    }
+    return progress;
+}
+
+- (void)setSd_imageProgress:(NSProgress *)sd_imageProgress {
+    if (!sd_imageProgress) {
+        return;
+    }
+    SDWebImageLoadState *loadState = [self sd_imageLoadStateForKey:self.sd_latestOperationKey];
+    if (!loadState) {
+        loadState = [SDWebImageLoadState new];
+    }
+    loadState.progress = sd_imageProgress;
+    [self sd_setImageLoadState:loadState forKey:self.sd_latestOperationKey];
+}
+
+- (nullable id<SDWebImageOperation>)sd_internalSetImageWithURL:(nullable NSURL *)url
+                                              placeholderImage:(nullable UIImage *)placeholder
+                                                       options:(SDWebImageOptions)options
+                                                       context:(nullable SDWebImageContext *)context
+                                                 setImageBlock:(nullable SDSetImageBlock)setImageBlock
+                                                      progress:(nullable SDImageLoaderProgressBlock)progressBlock
+                                                     completed:(nullable SDInternalCompletionBlock)completedBlock {
+    
+    // Very common mistake is to send the URL using NSString object instead of NSURL. For some strange reason, Xcode won't
+    // throw any warning for this type mismatch. Here we failsafe this error by allowing URLs to be passed as NSString.
+    //  if url is NSString and shouldUseWeakMemoryCache is true, [cacheKeyForURL:context] will crash. just for a  global protect.
+    if ([url isKindOfClass:NSString.class]) {
+        url = [NSURL URLWithString:(NSString *)url];
+    }
+    // Prevents app crashing on argument type error like sending NSNull instead of NSURL
+    if (![url isKindOfClass:NSURL.class]) {
+        url = nil;
+    }
+    
+    if (context) {
+        // copy to avoid mutable object
+        context = [context copy];
+    } else {
+        context = [NSDictionary dictionary];
+    }
+    NSString *validOperationKey = context[SDWebImageContextSetImageOperationKey];
+    if (!validOperationKey) {
+        // pass through the operation key to downstream, which can used for tracing operation or image view class
+        validOperationKey = NSStringFromClass([self class]);
+        SDWebImageMutableContext *mutableContext = [context mutableCopy];
+        mutableContext[SDWebImageContextSetImageOperationKey] = validOperationKey;
+        context = [mutableContext copy];
+    }
+    self.sd_latestOperationKey = validOperationKey;
+    if (!(SD_OPTIONS_CONTAINS(options, SDWebImageAvoidAutoCancelImage))) {
+        // cancel previous loading for the same set-image operation key by default
+        [self sd_cancelImageLoadOperationWithKey:validOperationKey];
+    }
+    SDWebImageLoadState *loadState = [self sd_imageLoadStateForKey:validOperationKey];
+    if (!loadState) {
+        loadState = [SDWebImageLoadState new];
+    }
+    loadState.url = url;
+    [self sd_setImageLoadState:loadState forKey:validOperationKey];
+    
+    SDWebImageManager *manager = context[SDWebImageContextCustomManager];
+    if (!manager) {
+        manager = [SDWebImageManager sharedManager];
+    } else {
+        // remove this manager to avoid retain cycle (manger -> loader -> operation -> context -> manager)
+        SDWebImageMutableContext *mutableContext = [context mutableCopy];
+        mutableContext[SDWebImageContextCustomManager] = nil;
+        context = [mutableContext copy];
+    }
+    SDCallbackQueue *queue = context[SDWebImageContextCallbackQueue];
+    BOOL shouldUseWeakCache = NO;
+    if ([manager.imageCache isKindOfClass:SDImageCache.class]) {
+        shouldUseWeakCache = ((SDImageCache *)manager.imageCache).config.shouldUseWeakMemoryCache;
+    }
+    if (!(options & SDWebImageDelayPlaceholder)) {
+        if (shouldUseWeakCache) {
+            NSString *key = [manager cacheKeyForURL:url context:context];
+            // call memory cache to trigger weak cache sync logic, ignore the return value and go on normal query
+            // this unfortunately will cause twice memory cache query, but it's fast enough
+            // in the future the weak cache feature may be re-design or removed
+            [((SDImageCache *)manager.imageCache) imageFromMemoryCacheForKey:key];
+        }
+        [(queue ?: SDCallbackQueue.mainQueue) async:^{
+            [self sd_setImage:placeholder imageData:nil basedOnClassOrViaCustomSetImageBlock:setImageBlock cacheType:SDImageCacheTypeNone imageURL:url];
+        }];
+    }
+    
+    id <SDWebImageOperation> operation = nil;
+    
+    if (url) {
+        // reset the progress
+        NSProgress *imageProgress = loadState.progress;
+        if (imageProgress) {
+            imageProgress.totalUnitCount = 0;
+            imageProgress.completedUnitCount = 0;
+        }
+        
+#if SD_UIKIT || SD_MAC
+        // check and start image indicator
+        [self sd_startImageIndicatorWithQueue:queue];
+        id<SDWebImageIndicator> imageIndicator = self.sd_imageIndicator;
+#endif
+        
+        SDImageLoaderProgressBlock combinedProgressBlock = ^(NSInteger receivedSize, NSInteger expectedSize, NSURL * _Nullable targetURL) {
+            if (imageProgress) {
+                imageProgress.totalUnitCount = expectedSize;
+                imageProgress.completedUnitCount = receivedSize;
+            }
+#if SD_UIKIT || SD_MAC
+            if ([imageIndicator respondsToSelector:@selector(updateIndicatorProgress:)]) {
+                double progress = 0;
+                if (expectedSize != 0) {
+                    progress = (double)receivedSize / expectedSize;
+                }
+                progress = MAX(MIN(progress, 1), 0); // 0.0 - 1.0
+                dispatch_async(dispatch_get_main_queue(), ^{
+                    [imageIndicator updateIndicatorProgress:progress];
+                });
+            }
+#endif
+            if (progressBlock) {
+                progressBlock(receivedSize, expectedSize, targetURL);
+            }
+        };
+        @weakify(self);
+        operation = [manager loadImageWithURL:url options:options context:context progress:combinedProgressBlock completed:^(UIImage *image, NSData *data, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {
+            @strongify(self);
+            if (!self) { return; }
+            // if the progress not been updated, mark it to complete state
+            if (imageProgress && finished && !error && imageProgress.totalUnitCount == 0 && imageProgress.completedUnitCount == 0) {
+                imageProgress.totalUnitCount = SDWebImageProgressUnitCountUnknown;
+                imageProgress.completedUnitCount = SDWebImageProgressUnitCountUnknown;
+            }
+            
+#if SD_UIKIT || SD_MAC
+            // check and stop image indicator
+            if (finished) {
+                [self sd_stopImageIndicatorWithQueue:queue];
+            }
+#endif
+            
+            BOOL shouldCallCompletedBlock = finished || (options & SDWebImageAvoidAutoSetImage);
+            BOOL shouldNotSetImage = ((image && (options & SDWebImageAvoidAutoSetImage)) ||
+                                      (!image && !(options & SDWebImageDelayPlaceholder)));
+            SDWebImageNoParamsBlock callCompletedBlockClosure = ^{
+                if (!self) { return; }
+                if (!shouldNotSetImage) {
+                    [self sd_setNeedsLayout];
+                }
+                if (completedBlock && shouldCallCompletedBlock) {
+                    completedBlock(image, data, error, cacheType, finished, url);
+                }
+            };
+            
+            // case 1a: we got an image, but the SDWebImageAvoidAutoSetImage flag is set
+            // OR
+            // case 1b: we got no image and the SDWebImageDelayPlaceholder is not set
+            if (shouldNotSetImage) {
+                [(queue ?: SDCallbackQueue.mainQueue) async:callCompletedBlockClosure];
+                return;
+            }
+            
+            UIImage *targetImage = nil;
+            NSData *targetData = nil;
+            if (image) {
+                // case 2a: we got an image and the SDWebImageAvoidAutoSetImage is not set
+                targetImage = image;
+                targetData = data;
+            } else if (options & SDWebImageDelayPlaceholder) {
+                // case 2b: we got no image and the SDWebImageDelayPlaceholder flag is set
+                targetImage = placeholder;
+                targetData = nil;
+            }
+            
+#if SD_UIKIT || SD_MAC
+            // check whether we should use the image transition
+            SDWebImageTransition *transition = nil;
+            BOOL shouldUseTransition = NO;
+            if (options & SDWebImageForceTransition) {
+                // Always
+                shouldUseTransition = YES;
+            } else if (cacheType == SDImageCacheTypeNone) {
+                // From network
+                shouldUseTransition = YES;
+            } else {
+                // From disk (and, user don't use sync query)
+                if (cacheType == SDImageCacheTypeMemory) {
+                    shouldUseTransition = NO;
+                } else if (cacheType == SDImageCacheTypeDisk) {
+                    if (options & SDWebImageQueryMemoryDataSync || options & SDWebImageQueryDiskDataSync) {
+                        shouldUseTransition = NO;
+                    } else {
+                        shouldUseTransition = YES;
+                    }
+                } else {
+                    // Not valid cache type, fallback
+                    shouldUseTransition = NO;
+                }
+            }
+            if (finished && shouldUseTransition) {
+                transition = self.sd_imageTransition;
+            }
+#endif
+            [(queue ?: SDCallbackQueue.mainQueue) async:^{
+#if SD_UIKIT || SD_MAC
+                [self sd_setImage:targetImage imageData:targetData options:options basedOnClassOrViaCustomSetImageBlock:setImageBlock transition:transition cacheType:cacheType imageURL:imageURL callback:callCompletedBlockClosure];
+#else
+                [self sd_setImage:targetImage imageData:targetData basedOnClassOrViaCustomSetImageBlock:setImageBlock cacheType:cacheType imageURL:imageURL];
+                callCompletedBlockClosure();
+#endif
+            }];
+        }];
+        [self sd_setImageLoadOperation:operation forKey:validOperationKey];
+    } else {
+#if SD_UIKIT || SD_MAC
+        [self sd_stopImageIndicatorWithQueue:queue];
+#endif
+        if (completedBlock) {
+            [(queue ?: SDCallbackQueue.mainQueue) async:^{
+                NSError *error = [NSError errorWithDomain:SDWebImageErrorDomain code:SDWebImageErrorInvalidURL userInfo:@{NSLocalizedDescriptionKey : @"Image url is nil"}];
+                completedBlock(nil, nil, error, SDImageCacheTypeNone, YES, url);
+            }];
+        }
+    }
+    
+    return operation;
+}
+
+- (void)sd_cancelLatestImageLoad {
+    [self sd_cancelImageLoadOperationWithKey:self.sd_latestOperationKey];
+}
+
+- (void)sd_cancelCurrentImageLoad {
+    [self sd_cancelImageLoadOperationWithKey:self.sd_latestOperationKey];
+}
+
+// Set image logic without transition (like placeholder and watchOS)
+- (void)sd_setImage:(UIImage *)image imageData:(NSData *)imageData basedOnClassOrViaCustomSetImageBlock:(SDSetImageBlock)setImageBlock cacheType:(SDImageCacheType)cacheType imageURL:(NSURL *)imageURL {
+#if SD_UIKIT || SD_MAC
+    [self sd_setImage:image imageData:imageData options:0 basedOnClassOrViaCustomSetImageBlock:setImageBlock transition:nil cacheType:cacheType imageURL:imageURL callback:nil];
+#else
+    // watchOS does not support view transition. Simplify the logic
+    if (setImageBlock) {
+        setImageBlock(image, imageData, cacheType, imageURL);
+    } else if ([self isKindOfClass:[UIImageView class]]) {
+        UIImageView *imageView = (UIImageView *)self;
+        [imageView setImage:image];
+    }
+#endif
+}
+
+// Set image logic with transition
+#if SD_UIKIT || SD_MAC
+- (void)sd_setImage:(UIImage *)image imageData:(NSData *)imageData options:(SDWebImageOptions)options basedOnClassOrViaCustomSetImageBlock:(SDSetImageBlock)setImageBlock transition:(SDWebImageTransition *)transition cacheType:(SDImageCacheType)cacheType imageURL:(NSURL *)imageURL callback:(SDWebImageNoParamsBlock)callback {
+    UIView *view = self;
+    SDSetImageBlock finalSetImageBlock;
+    if (setImageBlock) {
+        finalSetImageBlock = setImageBlock;
+    } else if ([view isKindOfClass:[UIImageView class]]) {
+        UIImageView *imageView = (UIImageView *)view;
+        finalSetImageBlock = ^(UIImage *setImage, NSData *setImageData, SDImageCacheType setCacheType, NSURL *setImageURL) {
+            imageView.image = setImage;
+        };
+    }
+#if SD_UIKIT
+    else if ([view isKindOfClass:[UIButton class]]) {
+        UIButton *button = (UIButton *)view;
+        finalSetImageBlock = ^(UIImage *setImage, NSData *setImageData, SDImageCacheType setCacheType, NSURL *setImageURL) {
+            [button setImage:setImage forState:UIControlStateNormal];
+        };
+    }
+#endif
+#if SD_MAC
+    else if ([view isKindOfClass:[NSButton class]]) {
+        NSButton *button = (NSButton *)view;
+        finalSetImageBlock = ^(UIImage *setImage, NSData *setImageData, SDImageCacheType setCacheType, NSURL *setImageURL) {
+            button.image = setImage;
+        };
+    }
+#endif
+    
+    BOOL waitTransition = SD_OPTIONS_CONTAINS(options, SDWebImageWaitTransition);
+    if (transition) {
+        NSString *originalOperationKey = view.sd_latestOperationKey;
+
+#if SD_UIKIT
+        [UIView transitionWithView:view duration:0 options:0 animations:^{
+            if (!view.sd_latestOperationKey || ![originalOperationKey isEqualToString:view.sd_latestOperationKey]) {
+                return;
+            }
+            // 0 duration to let UIKit render placeholder and prepares block
+            if (transition.prepares) {
+                transition.prepares(view, image, imageData, cacheType, imageURL);
+            }
+        } completion:^(BOOL tempFinished) {
+            [UIView transitionWithView:view duration:transition.duration options:transition.animationOptions animations:^{
+                if (!view.sd_latestOperationKey || ![originalOperationKey isEqualToString:view.sd_latestOperationKey]) {
+                    return;
+                }
+                if (finalSetImageBlock && !transition.avoidAutoSetImage) {
+                    finalSetImageBlock(image, imageData, cacheType, imageURL);
+                }
+                if (transition.animations) {
+                    transition.animations(view, image);
+                }
+            } completion:^(BOOL finished) {
+                if (!view.sd_latestOperationKey || ![originalOperationKey isEqualToString:view.sd_latestOperationKey]) {
+                    return;
+                }
+                if (transition.completion) {
+                    transition.completion(finished);
+                }
+                if (waitTransition) {
+                    if (callback) {
+                        callback();
+                    }
+                }
+            }];
+        }];
+#elif SD_MAC
+        [NSAnimationContext runAnimationGroup:^(NSAnimationContext * _Nonnull prepareContext) {
+            if (!view.sd_latestOperationKey || ![originalOperationKey isEqualToString:view.sd_latestOperationKey]) {
+                return;
+            }
+            // 0 duration to let AppKit render placeholder and prepares block
+            prepareContext.duration = 0;
+            if (transition.prepares) {
+                transition.prepares(view, image, imageData, cacheType, imageURL);
+            }
+        } completionHandler:^{
+            [NSAnimationContext runAnimationGroup:^(NSAnimationContext * _Nonnull context) {
+                if (!view.sd_latestOperationKey || ![originalOperationKey isEqualToString:view.sd_latestOperationKey]) {
+                    return;
+                }
+                context.duration = transition.duration;
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+                CAMediaTimingFunction *timingFunction = transition.timingFunction;
+#pragma clang diagnostic pop
+                if (!timingFunction) {
+                    timingFunction = SDTimingFunctionFromAnimationOptions(transition.animationOptions);
+                }
+                context.timingFunction = timingFunction;
+                context.allowsImplicitAnimation = SD_OPTIONS_CONTAINS(transition.animationOptions, SDWebImageAnimationOptionAllowsImplicitAnimation);
+                if (finalSetImageBlock && !transition.avoidAutoSetImage) {
+                    finalSetImageBlock(image, imageData, cacheType, imageURL);
+                }
+                CATransition *trans = SDTransitionFromAnimationOptions(transition.animationOptions);
+                if (trans) {
+                    [view.layer addAnimation:trans forKey:kCATransition];
+                }
+                if (transition.animations) {
+                    transition.animations(view, image);
+                }
+            } completionHandler:^{
+                if (!view.sd_latestOperationKey || ![originalOperationKey isEqualToString:view.sd_latestOperationKey]) {
+                    return;
+                }
+                if (transition.completion) {
+                    transition.completion(YES);
+                }
+                if (waitTransition) {
+                    if (callback) {
+                        callback();
+                    }
+                }
+            }];
+        }];
+#endif
+        if (!waitTransition) {
+            if (callback) {
+                callback();
+            }
+        }
+    } else {
+        if (finalSetImageBlock) {
+            finalSetImageBlock(image, imageData, cacheType, imageURL);
+            // TODO, in 6.0
+            // for `waitTransition`, the `setImageBlock` will provide a extra `completionHandler` params
+            // Execute `callback` only after that completionHandler is called
+            if (waitTransition) {
+                if (callback) {
+                    callback();
+                }
+            }
+        }
+        if (!waitTransition) {
+            if (callback) {
+                callback();
+            }
+        }
+    }
+}
+#endif
+
+- (void)sd_setNeedsLayout {
+#if SD_UIKIT
+    [self setNeedsLayout];
+#elif SD_MAC
+    [self setNeedsLayout:YES];
+#elif SD_WATCH
+    // Do nothing because WatchKit automatically layout the view after property change
+#endif
+}
+
+#if SD_UIKIT || SD_MAC
+
+#pragma mark - Image Transition
+- (SDWebImageTransition *)sd_imageTransition {
+    return objc_getAssociatedObject(self, @selector(sd_imageTransition));
+}
+
+- (void)setSd_imageTransition:(SDWebImageTransition *)sd_imageTransition {
+    objc_setAssociatedObject(self, @selector(sd_imageTransition), sd_imageTransition, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+}
+
+#pragma mark - Indicator
+- (id<SDWebImageIndicator>)sd_imageIndicator {
+    return objc_getAssociatedObject(self, @selector(sd_imageIndicator));
+}
+
+- (void)setSd_imageIndicator:(id<SDWebImageIndicator>)sd_imageIndicator {
+    // Remove the old indicator view
+    id<SDWebImageIndicator> previousIndicator = self.sd_imageIndicator;
+    [previousIndicator.indicatorView removeFromSuperview];
+    
+    objc_setAssociatedObject(self, @selector(sd_imageIndicator), sd_imageIndicator, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+    
+    // Add the new indicator view
+    UIView *view = sd_imageIndicator.indicatorView;
+    if (CGRectEqualToRect(view.frame, CGRectZero)) {
+        view.frame = self.bounds;
+    }
+    // Center the indicator view
+#if SD_MAC
+    [view setFrameOrigin:CGPointMake(round((NSWidth(self.bounds) - NSWidth(view.frame)) / 2), round((NSHeight(self.bounds) - NSHeight(view.frame)) / 2))];
+#else
+    view.center = CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMidY(self.bounds));
+#endif
+    view.hidden = NO;
+    [self addSubview:view];
+}
+
+- (void)sd_startImageIndicatorWithQueue:(SDCallbackQueue *)queue {
+    id<SDWebImageIndicator> imageIndicator = self.sd_imageIndicator;
+    if (!imageIndicator) {
+        return;
+    }
+    [(queue ?: SDCallbackQueue.mainQueue) async:^{
+        [imageIndicator startAnimatingIndicator];
+    }];
+}
+
+- (void)sd_stopImageIndicatorWithQueue:(SDCallbackQueue *)queue {
+    id<SDWebImageIndicator> imageIndicator = self.sd_imageIndicator;
+    if (!imageIndicator) {
+        return;
+    }
+    [(queue ?: SDCallbackQueue.mainQueue) async:^{
+        [imageIndicator stopAnimatingIndicator];
+    }];
+}
+
+#endif
+
+@end
diff --git a/SDWebImage/Core/UIView+WebCacheOperation.h b/SDWebImage/Core/UIView+WebCacheOperation.h
new file mode 100644
index 000000000..0bc12caff
--- /dev/null
+++ b/SDWebImage/Core/UIView+WebCacheOperation.h
@@ -0,0 +1,52 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+#import "SDWebImageOperation.h"
+
+/**
+ These methods are used to support canceling for UIView image loading, it's designed to be used internal but not external.
+ All the stored operations are weak, so it will be dealloced after image loading finished. If you need to store operations, use your own class to keep a strong reference for them.
+ */
+@interface UIView (WebCacheOperation)
+
+/**
+ *  Get the image load operation for key
+ *
+ *  @param key key for identifying the operations
+ *  @return the image load operation
+ *  @note If key is nil, means using the NSStringFromClass(self.class) instead, match the behavior of `operation key`
+ */
+- (nullable id<SDWebImageOperation>)sd_imageLoadOperationForKey:(nullable NSString *)key;
+
+/**
+ *  Set the image load operation (storage in a UIView based weak map table)
+ *
+ *  @param operation the operation, should not be nil or no-op will perform
+ *  @param key       key for storing the operation
+ *  @note If key is nil, means using the NSStringFromClass(self.class) instead, match the behavior of `operation key`
+ */
+- (void)sd_setImageLoadOperation:(nullable id<SDWebImageOperation>)operation forKey:(nullable NSString *)key;
+
+/**
+ *  Cancel the operation for the current UIView and key
+ *
+ *  @param key key for identifying the operations
+ *  @note If key is nil, means using the NSStringFromClass(self.class) instead, match the behavior of `operation key`
+ */
+- (void)sd_cancelImageLoadOperationWithKey:(nullable NSString *)key;
+
+/**
+ *  Just remove the operation corresponding to the current UIView and key without cancelling them
+ *
+ *  @param key key for identifying the operations.
+ *  @note If key is nil, means using the NSStringFromClass(self.class) instead, match the behavior of `operation key`
+ */
+- (void)sd_removeImageLoadOperationWithKey:(nullable NSString *)key;
+
+@end
diff --git a/SDWebImage/Core/UIView+WebCacheOperation.m b/SDWebImage/Core/UIView+WebCacheOperation.m
new file mode 100644
index 000000000..99c8fe45a
--- /dev/null
+++ b/SDWebImage/Core/UIView+WebCacheOperation.m
@@ -0,0 +1,85 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "UIView+WebCacheOperation.h"
+#import "objc/runtime.h"
+
+// key is strong, value is weak because operation instance is retained by SDWebImageManager's runningOperations property
+// we should use lock to keep thread-safe because these method may not be accessed from main queue
+typedef NSMapTable<NSString *, id<SDWebImageOperation>> SDOperationsDictionary;
+
+@implementation UIView (WebCacheOperation)
+
+- (SDOperationsDictionary *)sd_operationDictionary {
+    @synchronized(self) {
+        SDOperationsDictionary *operations = objc_getAssociatedObject(self, @selector(sd_operationDictionary));
+        if (operations) {
+            return operations;
+        }
+        operations = [[NSMapTable alloc] initWithKeyOptions:NSPointerFunctionsStrongMemory valueOptions:NSPointerFunctionsWeakMemory capacity:0];
+        objc_setAssociatedObject(self, @selector(sd_operationDictionary), operations, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+        return operations;
+    }
+}
+
+- (nullable id<SDWebImageOperation>)sd_imageLoadOperationForKey:(nullable NSString *)key  {
+    id<SDWebImageOperation> operation;
+    if (!key) {
+        key = NSStringFromClass(self.class);
+    }
+    SDOperationsDictionary *operationDictionary = [self sd_operationDictionary];
+    @synchronized (self) {
+        operation = [operationDictionary objectForKey:key];
+    }
+    return operation;
+}
+
+- (void)sd_setImageLoadOperation:(nullable id<SDWebImageOperation>)operation forKey:(nullable NSString *)key {
+    if (!key) {
+        key = NSStringFromClass(self.class);
+    }
+    if (operation) {
+        SDOperationsDictionary *operationDictionary = [self sd_operationDictionary];
+        @synchronized (self) {
+            [operationDictionary setObject:operation forKey:key];
+        }
+    }
+}
+
+- (void)sd_cancelImageLoadOperationWithKey:(nullable NSString *)key {
+    if (!key) {
+        key = NSStringFromClass(self.class);
+    }
+    // Cancel in progress downloader from queue
+    SDOperationsDictionary *operationDictionary = [self sd_operationDictionary];
+    id<SDWebImageOperation> operation;
+    
+    @synchronized (self) {
+        operation = [operationDictionary objectForKey:key];
+    }
+    if (operation) {
+        if ([operation respondsToSelector:@selector(cancel)]) {
+            [operation cancel];
+        }
+        @synchronized (self) {
+            [operationDictionary removeObjectForKey:key];
+        }
+    }
+}
+
+- (void)sd_removeImageLoadOperationWithKey:(nullable NSString *)key {
+    if (!key) {
+        key = NSStringFromClass(self.class);
+    }
+    SDOperationsDictionary *operationDictionary = [self sd_operationDictionary];
+    @synchronized (self) {
+        [operationDictionary removeObjectForKey:key];
+    }
+}
+
+@end
diff --git a/SDWebImage/Core/UIView+WebCacheState.h b/SDWebImage/Core/UIView+WebCacheState.h
new file mode 100644
index 000000000..527638755
--- /dev/null
+++ b/SDWebImage/Core/UIView+WebCacheState.h
@@ -0,0 +1,63 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCompat.h"
+
+/**
+ A loading state to manage View Category which contains multiple states. Like UIImgeView.image && UIImageView.highlightedImage
+
+ * @code
+ SDWebImageLoadState *loadState = [self sd_imageLoadStateForKey:@keypath(self, highlitedImage)];
+ NSProgress *highlitedImageProgress = loadState.progress;
+ * @endcode
+ */
+@interface SDWebImageLoadState : NSObject
+
+/**
+ Image loading URL
+ */
+@property (nonatomic, strong, nullable) NSURL *url;
+/**
+ Image loading progress. The unit count is the received size and excepted size of download.
+ */
+@property (nonatomic, strong, nullable) NSProgress *progress;
+
+@end
+
+/**
+ These methods are used for WebCache view which have multiple states for image loading, for example, `UIButton` or `UIImageView.highlightedImage`
+ It maitain the state container for per-operation, make it possible for control and check each image loading operation's state.
+ @note For developer who want to add SDWebImage View Category support for their own stateful class, learn more on Wiki.
+ */
+@interface UIView (WebCacheState)
+
+/**
+ Get the image loading state container for specify operation key
+
+ @param key key for identifying the operations
+ @return The image loading state container
+ */
+- (nullable SDWebImageLoadState *)sd_imageLoadStateForKey:(nullable NSString *)key;
+
+/**
+ Set the image loading state container for specify operation key
+
+ @param state The image loading state container
+ @param key key for identifying the operations
+ */
+- (void)sd_setImageLoadState:(nullable SDWebImageLoadState *)state forKey:(nullable NSString *)key;
+
+/**
+ Rmove the image loading state container for specify operation key
+
+ @param key key for identifying the operations
+ */
+- (void)sd_removeImageLoadStateForKey:(nullable NSString *)key;
+
+@end
diff --git a/SDWebImage/Core/UIView+WebCacheState.m b/SDWebImage/Core/UIView+WebCacheState.m
new file mode 100644
index 000000000..7312b9852
--- /dev/null
+++ b/SDWebImage/Core/UIView+WebCacheState.m
@@ -0,0 +1,56 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "UIView+WebCacheState.h"
+#import "objc/runtime.h"
+
+typedef NSMutableDictionary<NSString *, SDWebImageLoadState *> SDStatesDictionary;
+
+@implementation SDWebImageLoadState
+
+@end
+
+@implementation UIView (WebCacheState)
+
+- (SDStatesDictionary *)sd_imageLoadStateDictionary {
+    SDStatesDictionary *states = objc_getAssociatedObject(self, @selector(sd_imageLoadStateDictionary));
+    if (!states) {
+        states = [NSMutableDictionary dictionary];
+        objc_setAssociatedObject(self, @selector(sd_imageLoadStateDictionary), states, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+    }
+    return states;
+}
+
+- (SDWebImageLoadState *)sd_imageLoadStateForKey:(NSString *)key {
+    if (!key) {
+        key = NSStringFromClass(self.class);
+    }
+    @synchronized(self) {
+        return [self.sd_imageLoadStateDictionary objectForKey:key];
+    }
+}
+
+- (void)sd_setImageLoadState:(SDWebImageLoadState *)state forKey:(NSString *)key {
+    if (!key) {
+        key = NSStringFromClass(self.class);
+    }
+    @synchronized(self) {
+        self.sd_imageLoadStateDictionary[key] = state;
+    }
+}
+
+- (void)sd_removeImageLoadStateForKey:(NSString *)key {
+    if (!key) {
+        key = NSStringFromClass(self.class);
+    }
+    @synchronized(self) {
+        self.sd_imageLoadStateDictionary[key] = nil;
+    }
+}
+
+@end
diff --git a/SDWebImage/FLAnimatedImage/FLAnimatedImageView+WebCache.h b/SDWebImage/FLAnimatedImage/FLAnimatedImageView+WebCache.h
deleted file mode 100644
index 1a0d55b29..000000000
--- a/SDWebImage/FLAnimatedImage/FLAnimatedImageView+WebCache.h
+++ /dev/null
@@ -1,168 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "SDWebImageCompat.h"
-
-#if SD_UIKIT
-
-#if __has_include(<FLAnimatedImage/FLAnimatedImage.h>)
-#import <FLAnimatedImage/FLAnimatedImage.h>
-#else
-#import "FLAnimatedImage.h"
-#endif
-
-#import "SDWebImageManager.h"
-
-/**
- *  FLAnimatedImage is not a subclass of UIImage, so it's not possible to store it into the memory cache currently. However, for performance issue and cell reuse on FLAnimatedImageView, we use associate object to bind a FLAnimatedImage into UIImage when an animated GIF image load. For most cases, you don't need to touch this.
- */
-@interface UIImage (FLAnimatedImage)
-
-/**
- *  The FLAnimatedImage associated to the UIImage instance when an animated GIF image load.
- *  For most cases this is read-only and you should avoid manually setting this value. Util some cases like using placeholder with a `FLAnimatedImage`.
- */
-@property (nonatomic, strong, nullable) FLAnimatedImage *sd_FLAnimatedImage;
-
-@end
-
-
-/**
- *  A category for the FLAnimatedImage imageView class that hooks it to the SDWebImage system.
- *  Very similar to the base class category (UIImageView (WebCache))
- */
-@interface FLAnimatedImageView (WebCache)
-
-/**
- * Optimal frame cache size of FLAnimatedImage during initializer. (1.0.11 version later)
- * This value will help you set `optimalFrameCacheSize` arg of FLAnimatedImage initializer after image load.
- * Defaults to 0.
- */
-@property (nonatomic, assign) NSUInteger sd_optimalFrameCacheSize;
-
-/**
- * Predrawing control of FLAnimatedImage during initializer. (1.0.11 version later)
- * This value will help you set `predrawingEnabled` arg of FLAnimatedImage initializer after image load.
- * Defaults to YES.
- */
-@property (nonatomic, assign) BOOL sd_predrawingEnabled;
-
-/**
- * Cache control for associated FLAnimatedImage object for memory cache. When enabled, we will bind created FLAnimatedImage instance to UIImage, and store it into memory cache to avoid create this instance cause decoding performance. See `UIImage+FLAnimatedImage`.
- * When enabled, this may consume more memory, if you are facing memory issue, disable it and let FLAnimatedImage been created just in time and dealloced as it not been used. However, when disabled, this may impact performance since we need query disk cache, create FLAnimatedImage and decoding even when the current GIF url is cached.
- * Defatuls to YES;
- */
-@property (nonatomic, assign) BOOL sd_cacheFLAnimatedImage;
-
-/**
- * Load the image at the given url (either from cache or download) and load it in this imageView. It works with both static and dynamic images
- * The download is asynchronous and cached.
- *
- * @param url The url for the image.
- */
-- (void)sd_setImageWithURL:(nullable NSURL *)url NS_REFINED_FOR_SWIFT;
-
-/**
- * Load the image at the given url (either from cache or download) and load it in this imageView. It works with both static and dynamic images
- * The download is asynchronous and cached.
- * Uses a placeholder until the request finishes.
- *
- * @param url         The url for the image.
- * @param placeholder The image to be set initially, until the image request finishes.
- */
-- (void)sd_setImageWithURL:(nullable NSURL *)url
-          placeholderImage:(nullable UIImage *)placeholder NS_REFINED_FOR_SWIFT;
-
-/**
- * Load the image at the given url (either from cache or download) and load it in this imageView. It works with both static and dynamic images
- * The download is asynchronous and cached.
- * Uses a placeholder until the request finishes.
- *
- *  @param url         The url for the image.
- *  @param placeholder The image to be set initially, until the image request finishes.
- *  @param options     The options to use when downloading the image. @see SDWebImageOptions for the possible values.
- */
-- (void)sd_setImageWithURL:(nullable NSURL *)url
-          placeholderImage:(nullable UIImage *)placeholder
-                   options:(SDWebImageOptions)options NS_REFINED_FOR_SWIFT;
-
-/**
- * Load the image at the given url (either from cache or download) and load it in this imageView. It works with both static and dynamic images
- * The download is asynchronous and cached.
- *
- *  @param url            The url for the image.
- *  @param completedBlock A block called when operation has been completed. This block has no return value
- *                        and takes the requested UIImage as first parameter. In case of error the image parameter
- *                        is nil and the second parameter may contain an NSError. The third parameter is a Boolean
- *                        indicating if the image was retrieved from the local cache or from the network.
- *                        The fourth parameter is the original image url.
- */
-- (void)sd_setImageWithURL:(nullable NSURL *)url
-                 completed:(nullable SDExternalCompletionBlock)completedBlock;
-
-/**
- * Load the image at the given url (either from cache or download) and load it in this imageView. It works with both static and dynamic images
- * The download is asynchronous and cached.
- * Uses a placeholder until the request finishes.
- *
- *  @param url            The url for the image.
- *  @param placeholder    The image to be set initially, until the image request finishes.
- *  @param completedBlock A block called when operation has been completed. This block has no return value
- *                        and takes the requested UIImage as first parameter. In case of error the image parameter
- *                        is nil and the second parameter may contain an NSError. The third parameter is a Boolean
- *                        indicating if the image was retrieved from the local cache or from the network.
- *                        The fourth parameter is the original image url.
- */
-- (void)sd_setImageWithURL:(nullable NSURL *)url
-          placeholderImage:(nullable UIImage *)placeholder
-                 completed:(nullable SDExternalCompletionBlock)completedBlock NS_REFINED_FOR_SWIFT;
-
-/**
- * Load the image at the given url (either from cache or download) and load it in this imageView. It works with both static and dynamic images
- * The download is asynchronous and cached.
- * Uses a placeholder until the request finishes.
- *
- *  @param url            The url for the image.
- *  @param placeholder    The image to be set initially, until the image request finishes.
- *  @param options        The options to use when downloading the image. @see SDWebImageOptions for the possible values.
- *  @param completedBlock A block called when operation has been completed. This block has no return value
- *                        and takes the requested UIImage as first parameter. In case of error the image parameter
- *                        is nil and the second parameter may contain an NSError. The third parameter is a Boolean
- *                        indicating if the image was retrieved from the local cache or from the network.
- *                        The fourth parameter is the original image url.
- */
-- (void)sd_setImageWithURL:(nullable NSURL *)url
-          placeholderImage:(nullable UIImage *)placeholder
-                   options:(SDWebImageOptions)options
-                 completed:(nullable SDExternalCompletionBlock)completedBlock;
-
-/**
- * Load the image at the given url (either from cache or download) and load it in this imageView. It works with both static and dynamic images
- * The download is asynchronous and cached.
- * Uses a placeholder until the request finishes.
- *
- *  @param url            The url for the image.
- *  @param placeholder    The image to be set initially, until the image request finishes.
- *  @param options        The options to use when downloading the image. @see SDWebImageOptions for the possible values.
- *  @param progressBlock  A block called while image is downloading
- *                        @note the progress block is executed on a background queue
- *  @param completedBlock A block called when operation has been completed. This block has no return value
- *                        and takes the requested UIImage as first parameter. In case of error the image parameter
- *                        is nil and the second parameter may contain an NSError. The third parameter is a Boolean
- *                        indicating if the image was retrieved from the local cache or from the network.
- *                        The fourth parameter is the original image url.
- */
-- (void)sd_setImageWithURL:(nullable NSURL *)url
-          placeholderImage:(nullable UIImage *)placeholder
-                   options:(SDWebImageOptions)options
-                  progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
-                 completed:(nullable SDExternalCompletionBlock)completedBlock;
-
-@end
-
-#endif
diff --git a/SDWebImage/FLAnimatedImage/FLAnimatedImageView+WebCache.m b/SDWebImage/FLAnimatedImage/FLAnimatedImageView+WebCache.m
deleted file mode 100644
index 99c1d033d..000000000
--- a/SDWebImage/FLAnimatedImage/FLAnimatedImageView+WebCache.m
+++ /dev/null
@@ -1,167 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "FLAnimatedImageView+WebCache.h"
-
-#if SD_UIKIT
-#import "objc/runtime.h"
-#import "UIView+WebCacheOperation.h"
-#import "UIView+WebCache.h"
-#import "NSData+ImageContentType.h"
-#import "UIImageView+WebCache.h"
-#import "UIImage+MultiFormat.h"
-
-static inline FLAnimatedImage * SDWebImageCreateFLAnimatedImage(FLAnimatedImageView *imageView, NSData *imageData) {
-    if ([NSData sd_imageFormatForImageData:imageData] != SDImageFormatGIF) {
-        return nil;
-    }
-    FLAnimatedImage *animatedImage;
-    // Compatibility in 4.x for lower version FLAnimatedImage.
-    if ([FLAnimatedImage respondsToSelector:@selector(initWithAnimatedGIFData:optimalFrameCacheSize:predrawingEnabled:)]) {
-        animatedImage = [[FLAnimatedImage alloc] initWithAnimatedGIFData:imageData optimalFrameCacheSize:imageView.sd_optimalFrameCacheSize predrawingEnabled:imageView.sd_predrawingEnabled];
-    } else {
-        animatedImage = [[FLAnimatedImage alloc] initWithAnimatedGIFData:imageData];
-    }
-    return animatedImage;
-}
-
-@implementation UIImage (FLAnimatedImage)
-
-- (FLAnimatedImage *)sd_FLAnimatedImage {
-    return objc_getAssociatedObject(self, @selector(sd_FLAnimatedImage));
-}
-
-- (void)setSd_FLAnimatedImage:(FLAnimatedImage *)sd_FLAnimatedImage {
-    objc_setAssociatedObject(self, @selector(sd_FLAnimatedImage), sd_FLAnimatedImage, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
-}
-
-@end
-
-@implementation FLAnimatedImageView (WebCache)
-
-// These property based options will moved to `SDWebImageContext` in 5.x, to allow per-image-request level options instead of per-imageView-level options
-- (NSUInteger)sd_optimalFrameCacheSize {
-    NSUInteger optimalFrameCacheSize = 0;
-    NSNumber *value = objc_getAssociatedObject(self, @selector(sd_optimalFrameCacheSize));
-    if ([value isKindOfClass:[NSNumber class]]) {
-        optimalFrameCacheSize = value.unsignedShortValue;
-    }
-    return optimalFrameCacheSize;
-}
-
-- (void)setSd_optimalFrameCacheSize:(NSUInteger)sd_optimalFrameCacheSize {
-    objc_setAssociatedObject(self, @selector(sd_optimalFrameCacheSize), @(sd_optimalFrameCacheSize), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
-}
-
-- (BOOL)sd_predrawingEnabled {
-    BOOL predrawingEnabled = YES;
-    NSNumber *value = objc_getAssociatedObject(self, @selector(sd_predrawingEnabled));
-    if ([value isKindOfClass:[NSNumber class]]) {
-        predrawingEnabled = value.boolValue;
-    }
-    return predrawingEnabled;
-}
-
-- (void)setSd_predrawingEnabled:(BOOL)sd_predrawingEnabled {
-    objc_setAssociatedObject(self, @selector(sd_predrawingEnabled), @(sd_predrawingEnabled), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
-}
-
-- (BOOL)sd_cacheFLAnimatedImage {
-    BOOL cacheFLAnimatedImage = YES;
-    NSNumber *value = objc_getAssociatedObject(self, @selector(sd_cacheFLAnimatedImage));
-    if ([value isKindOfClass:[NSNumber class]]) {
-        cacheFLAnimatedImage = value.boolValue;
-    }
-    return cacheFLAnimatedImage;
-}
-
-- (void)setSd_cacheFLAnimatedImage:(BOOL)sd_cacheFLAnimatedImage {
-    objc_setAssociatedObject(self, @selector(sd_cacheFLAnimatedImage), @(sd_cacheFLAnimatedImage), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
-}
-
-- (void)sd_setImageWithURL:(nullable NSURL *)url {
-    [self sd_setImageWithURL:url placeholderImage:nil options:0 progress:nil completed:nil];
-}
-
-- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder {
-    [self sd_setImageWithURL:url placeholderImage:placeholder options:0 progress:nil completed:nil];
-}
-
-- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options {
-    [self sd_setImageWithURL:url placeholderImage:placeholder options:options progress:nil completed:nil];
-}
-
-- (void)sd_setImageWithURL:(nullable NSURL *)url completed:(nullable SDExternalCompletionBlock)completedBlock {
-    [self sd_setImageWithURL:url placeholderImage:nil options:0 progress:nil completed:completedBlock];
-}
-
-- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder completed:(nullable SDExternalCompletionBlock)completedBlock {
-    [self sd_setImageWithURL:url placeholderImage:placeholder options:0 progress:nil completed:completedBlock];
-}
-
-- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options completed:(nullable SDExternalCompletionBlock)completedBlock {
-    [self sd_setImageWithURL:url placeholderImage:placeholder options:options progress:nil completed:completedBlock];
-}
-
-- (void)sd_setImageWithURL:(nullable NSURL *)url
-          placeholderImage:(nullable UIImage *)placeholder
-                   options:(SDWebImageOptions)options
-                  progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
-                 completed:(nullable SDExternalCompletionBlock)completedBlock {
-    __weak typeof(self)weakSelf = self;
-    [self sd_internalSetImageWithURL:url
-                    placeholderImage:placeholder
-                             options:options
-                        operationKey:nil
-                       setImageBlock:^(UIImage *image, NSData *imageData) {
-                           __strong typeof(weakSelf)strongSelf = weakSelf;
-                           if (!strongSelf) {
-                               return;
-                           }
-                           // Step 1. Check memory cache (associate object)
-                           FLAnimatedImage *associatedAnimatedImage = image.sd_FLAnimatedImage;
-                           if (associatedAnimatedImage) {
-                               // Asscociated animated image exist
-                               // FLAnimatedImage framework contains a bug that cause GIF been rotated if previous rendered image orientation is not Up. We have to call `setImage:` with non-nil image to reset the state. See `https://github.com/rs/SDWebImage/issues/2402`
-                               strongSelf.image = associatedAnimatedImage.posterImage;
-                               strongSelf.animatedImage = associatedAnimatedImage;
-                               return;
-                           }
-                           // Step 2. Check if original compressed image data is "GIF"
-                           BOOL isGIF = (image.sd_imageFormat == SDImageFormatGIF || [NSData sd_imageFormatForImageData:imageData] == SDImageFormatGIF);
-                           if (!isGIF) {
-                               strongSelf.image = image;
-                               strongSelf.animatedImage = nil;
-                               return;
-                           }
-                           // Step 3. Check if data exist or query disk cache
-                           if (!imageData) {
-                               NSString *key = [[SDWebImageManager sharedManager] cacheKeyForURL:url];
-                               imageData = [[SDImageCache sharedImageCache] diskImageDataForKey:key];
-                           }
-                           // Step 4. Create FLAnimatedImage
-                           FLAnimatedImage *animatedImage = SDWebImageCreateFLAnimatedImage(strongSelf, imageData);
-                           // Step 5. Set animatedImage or normal image
-                           if (animatedImage) {
-                               if (strongSelf.sd_cacheFLAnimatedImage) {
-                                   image.sd_FLAnimatedImage = animatedImage;
-                               }
-                               strongSelf.image = animatedImage.posterImage;
-                               strongSelf.animatedImage = animatedImage;
-                           } else {
-                               strongSelf.image = image;
-                               strongSelf.animatedImage = nil;
-                           }
-                       }
-                            progress:progressBlock
-                           completed:completedBlock];
-}
-
-@end
-
-#endif
diff --git a/SDWebImage/MKAnnotationView+WebCache.m b/SDWebImage/MKAnnotationView+WebCache.m
deleted file mode 100644
index 7ea2f5574..000000000
--- a/SDWebImage/MKAnnotationView+WebCache.m
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "MKAnnotationView+WebCache.h"
-
-#if SD_UIKIT || SD_MAC
-
-#import "objc/runtime.h"
-#import "UIView+WebCacheOperation.h"
-#import "UIView+WebCache.h"
-
-@implementation MKAnnotationView (WebCache)
-
-- (void)sd_setImageWithURL:(nullable NSURL *)url {
-    [self sd_setImageWithURL:url placeholderImage:nil options:0 completed:nil];
-}
-
-- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder {
-    [self sd_setImageWithURL:url placeholderImage:placeholder options:0 completed:nil];
-}
-
-- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options {
-    [self sd_setImageWithURL:url placeholderImage:placeholder options:options completed:nil];
-}
-
-- (void)sd_setImageWithURL:(nullable NSURL *)url completed:(nullable SDExternalCompletionBlock)completedBlock {
-    [self sd_setImageWithURL:url placeholderImage:nil options:0 completed:completedBlock];
-}
-
-- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder completed:(nullable SDExternalCompletionBlock)completedBlock {
-    [self sd_setImageWithURL:url placeholderImage:placeholder options:0 completed:completedBlock];
-}
-
-- (void)sd_setImageWithURL:(nullable NSURL *)url
-          placeholderImage:(nullable UIImage *)placeholder
-                   options:(SDWebImageOptions)options
-                 completed:(nullable SDExternalCompletionBlock)completedBlock {
-    __weak typeof(self)weakSelf = self;
-    [self sd_internalSetImageWithURL:url
-                    placeholderImage:placeholder
-                             options:options
-                        operationKey:nil
-                       setImageBlock:^(UIImage *image, NSData *imageData) {
-                           weakSelf.image = image;
-                       }
-                            progress:nil
-                           completed:completedBlock];
-}
-
-@end
-
-#endif
diff --git a/SDWebImage/NSData+ImageContentType.h b/SDWebImage/NSData+ImageContentType.h
deleted file mode 100644
index d7e214289..000000000
--- a/SDWebImage/NSData+ImageContentType.h
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- * (c) Fabrice Aneche
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import <Foundation/Foundation.h>
-#import "SDWebImageCompat.h"
-
-typedef NS_ENUM(NSInteger, SDImageFormat) {
-    SDImageFormatUndefined = -1,
-    SDImageFormatJPEG = 0,
-    SDImageFormatPNG,
-    SDImageFormatGIF,
-    SDImageFormatTIFF,
-    SDImageFormatWebP,
-    SDImageFormatHEIC
-};
-
-@interface NSData (ImageContentType)
-
-/**
- *  Return image format
- *
- *  @param data the input image data
- *
- *  @return the image format as `SDImageFormat` (enum)
- */
-+ (SDImageFormat)sd_imageFormatForImageData:(nullable NSData *)data;
-
-/**
- *  Convert SDImageFormat to UTType
- *
- *  @param format Format as SDImageFormat
- *  @return The UTType as CFStringRef
- */
-+ (nonnull CFStringRef)sd_UTTypeFromSDImageFormat:(SDImageFormat)format;
-
-/**
- *  Convert UTTyppe to SDImageFormat
- *
- *  @param uttype The UTType as CFStringRef
- *  @return The Format as SDImageFormat
- */
-+ (SDImageFormat)sd_imageFormatFromUTType:(nonnull CFStringRef)uttype;
-
-@end
diff --git a/SDWebImage/NSImage+WebCache.m b/SDWebImage/NSImage+WebCache.m
deleted file mode 100644
index 140ed6ce7..000000000
--- a/SDWebImage/NSImage+WebCache.m
+++ /dev/null
@@ -1,41 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "NSImage+WebCache.h"
-
-#if SD_MAC
-
-@implementation NSImage (WebCache)
-
-- (CGImageRef)CGImage {
-    NSRect imageRect = NSMakeRect(0, 0, self.size.width, self.size.height);
-    CGImageRef cgImage = [self CGImageForProposedRect:&imageRect context:NULL hints:nil];
-    return cgImage;
-}
-
-- (NSArray<NSImage *> *)images {
-    return nil;
-}
-
-- (BOOL)isGIF {
-    BOOL isGIF = NO;
-    for (NSImageRep *rep in self.representations) {
-        if ([rep isKindOfClass:[NSBitmapImageRep class]]) {
-            NSBitmapImageRep *bitmapRep = (NSBitmapImageRep *)rep;
-            NSUInteger frameCount = [[bitmapRep valueForProperty:NSImageFrameCount] unsignedIntegerValue];
-            isGIF = frameCount > 1 ? YES : NO;
-            break;
-        }
-    }
-    return isGIF;
-}
-
-@end
-
-#endif
-
diff --git a/SDWebImage/Private/NSBezierPath+SDRoundedCorners.h b/SDWebImage/Private/NSBezierPath+SDRoundedCorners.h
new file mode 100644
index 000000000..dfec18b79
--- /dev/null
+++ b/SDWebImage/Private/NSBezierPath+SDRoundedCorners.h
@@ -0,0 +1,24 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+
+#if SD_MAC
+
+#import "UIImage+Transform.h"
+
+@interface NSBezierPath (SDRoundedCorners)
+
+/**
+ Convenience way to create a bezier path with the specify rounding corners on macOS. Same as the one on `UIBezierPath`.
+ */
++ (nonnull instancetype)sd_bezierPathWithRoundedRect:(NSRect)rect byRoundingCorners:(SDRectCorner)corners cornerRadius:(CGFloat)cornerRadius;
+
+@end
+
+#endif
diff --git a/SDWebImage/Private/NSBezierPath+SDRoundedCorners.m b/SDWebImage/Private/NSBezierPath+SDRoundedCorners.m
new file mode 100644
index 000000000..b6f7a011b
--- /dev/null
+++ b/SDWebImage/Private/NSBezierPath+SDRoundedCorners.m
@@ -0,0 +1,42 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "NSBezierPath+SDRoundedCorners.h"
+
+#if SD_MAC
+
+@implementation NSBezierPath (SDRoundedCorners)
+
++ (instancetype)sd_bezierPathWithRoundedRect:(NSRect)rect byRoundingCorners:(SDRectCorner)corners cornerRadius:(CGFloat)cornerRadius {
+    NSBezierPath *path = [NSBezierPath bezierPath];
+    
+    CGFloat maxCorner = MIN(NSWidth(rect), NSHeight(rect)) / 2;
+    
+    CGFloat topLeftRadius = MIN(maxCorner, (corners & SDRectCornerTopLeft) ? cornerRadius : 0);
+    CGFloat topRightRadius = MIN(maxCorner, (corners & SDRectCornerTopRight) ? cornerRadius : 0);
+    CGFloat bottomLeftRadius = MIN(maxCorner, (corners & SDRectCornerBottomLeft) ? cornerRadius : 0);
+    CGFloat bottomRightRadius = MIN(maxCorner, (corners & SDRectCornerBottomRight) ? cornerRadius : 0);
+    
+    NSPoint topLeft = NSMakePoint(NSMinX(rect), NSMaxY(rect));
+    NSPoint topRight = NSMakePoint(NSMaxX(rect), NSMaxY(rect));
+    NSPoint bottomLeft = NSMakePoint(NSMinX(rect), NSMinY(rect));
+    NSPoint bottomRight = NSMakePoint(NSMaxX(rect), NSMinY(rect));
+    
+    [path moveToPoint:NSMakePoint(NSMidX(rect), NSMaxY(rect))];
+    [path appendBezierPathWithArcFromPoint:topLeft toPoint:bottomLeft radius:topLeftRadius];
+    [path appendBezierPathWithArcFromPoint:bottomLeft toPoint:bottomRight radius:bottomLeftRadius];
+    [path appendBezierPathWithArcFromPoint:bottomRight toPoint:topRight radius:bottomRightRadius];
+    [path appendBezierPathWithArcFromPoint:topRight toPoint:topLeft radius:topRightRadius];
+    [path closePath];
+    
+    return path;
+}
+
+@end
+
+#endif
diff --git a/SDWebImage/Private/SDAssociatedObject.h b/SDWebImage/Private/SDAssociatedObject.h
new file mode 100644
index 000000000..199cf4fce
--- /dev/null
+++ b/SDWebImage/Private/SDAssociatedObject.h
@@ -0,0 +1,14 @@
+/*
+* This file is part of the SDWebImage package.
+* (c) Olivier Poitrey <rs@dailymotion.com>
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code.
+*/
+
+#import "SDWebImageCompat.h"
+
+/// Copy the associated object from source image to target image. The associated object including all the category read/write properties.
+/// @param source source
+/// @param target target
+FOUNDATION_EXPORT void SDImageCopyAssociatedObject(UIImage * _Nullable source, UIImage * _Nullable target);
diff --git a/SDWebImage/Private/SDAssociatedObject.m b/SDWebImage/Private/SDAssociatedObject.m
new file mode 100644
index 000000000..4aff1e0c0
--- /dev/null
+++ b/SDWebImage/Private/SDAssociatedObject.m
@@ -0,0 +1,29 @@
+/*
+* This file is part of the SDWebImage package.
+* (c) Olivier Poitrey <rs@dailymotion.com>
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code.
+*/
+
+#import "SDAssociatedObject.h"
+#import "UIImage+Metadata.h"
+#import "UIImage+ExtendedCacheData.h"
+#import "UIImage+MemoryCacheCost.h"
+#import "UIImage+ForceDecode.h"
+
+void SDImageCopyAssociatedObject(UIImage * _Nullable source, UIImage * _Nullable target) {
+    if (!source || !target) {
+        return;
+    }
+    // Image Metadata
+    target.sd_isIncremental = source.sd_isIncremental;
+    target.sd_isTransformed = source.sd_isTransformed;
+    target.sd_decodeOptions = source.sd_decodeOptions;
+    target.sd_imageLoopCount = source.sd_imageLoopCount;
+    target.sd_imageFormat = source.sd_imageFormat;
+    // Force Decode
+    target.sd_isDecoded = source.sd_isDecoded;
+    // Extended Cache Data
+    target.sd_extendedObject = source.sd_extendedObject;
+}
diff --git a/SDWebImage/Private/SDAsyncBlockOperation.h b/SDWebImage/Private/SDAsyncBlockOperation.h
new file mode 100644
index 000000000..a3480deba
--- /dev/null
+++ b/SDWebImage/Private/SDAsyncBlockOperation.h
@@ -0,0 +1,21 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+
+@class SDAsyncBlockOperation;
+typedef void (^SDAsyncBlock)(SDAsyncBlockOperation * __nonnull asyncOperation);
+
+/// A async block operation, success after you call `completer` (not like `NSBlockOperation` which is for sync block, success on return)
+@interface SDAsyncBlockOperation : NSOperation
+
+- (nonnull instancetype)initWithBlock:(nonnull SDAsyncBlock)block;
++ (nonnull instancetype)blockOperationWithBlock:(nonnull SDAsyncBlock)block;
+- (void)complete;
+
+@end
diff --git a/SDWebImage/Private/SDAsyncBlockOperation.m b/SDWebImage/Private/SDAsyncBlockOperation.m
new file mode 100644
index 000000000..7e83a56b1
--- /dev/null
+++ b/SDWebImage/Private/SDAsyncBlockOperation.m
@@ -0,0 +1,92 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDAsyncBlockOperation.h"
+#import "SDInternalMacros.h"
+
+@interface SDAsyncBlockOperation ()
+
+@property (nonatomic, copy, nonnull) SDAsyncBlock executionBlock;
+
+@end
+
+@implementation SDAsyncBlockOperation
+
+@synthesize executing = _executing;
+@synthesize finished = _finished;
+
+- (nonnull instancetype)initWithBlock:(nonnull SDAsyncBlock)block {
+    self = [super init];
+    if (self) {
+        self.executionBlock = block;
+    }
+    return self;
+}
+
++ (nonnull instancetype)blockOperationWithBlock:(nonnull SDAsyncBlock)block {
+    SDAsyncBlockOperation *operation = [[SDAsyncBlockOperation alloc] initWithBlock:block];
+    return operation;
+}
+
+- (void)start {
+    @synchronized (self) {
+        if (self.isCancelled) {
+            self.finished = YES;
+            return;
+        }
+        self.finished = NO;
+        self.executing = YES;
+    }
+    SDAsyncBlock executionBlock = self.executionBlock;
+    if (executionBlock) {
+        @weakify(self);
+        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
+            @strongify(self);
+            if (!self) return;
+            executionBlock(self);
+        });
+    }
+}
+
+- (void)cancel {
+    @synchronized (self) {
+        [super cancel];
+        if (self.isExecuting) {
+            self.executing = NO;
+            self.finished = YES;
+        }
+    }
+}
+
+ 
+- (void)complete {
+    @synchronized (self) {
+        if (self.isExecuting) {
+            self.finished = YES;
+            self.executing = NO;
+        }
+    }
+}
+
+- (void)setFinished:(BOOL)finished {
+    [self willChangeValueForKey:@"isFinished"];
+    _finished = finished;
+    [self didChangeValueForKey:@"isFinished"];
+}
+
+- (void)setExecuting:(BOOL)executing {
+    [self willChangeValueForKey:@"isExecuting"];
+    _executing = executing;
+    [self didChangeValueForKey:@"isExecuting"];
+}
+
+- (BOOL)isAsynchronous {
+    return YES;
+}
+
+@end
diff --git a/SDWebImage/Private/SDDeviceHelper.h b/SDWebImage/Private/SDDeviceHelper.h
new file mode 100644
index 000000000..808866c11
--- /dev/null
+++ b/SDWebImage/Private/SDDeviceHelper.h
@@ -0,0 +1,24 @@
+/*
+* This file is part of the SDWebImage package.
+* (c) Olivier Poitrey <rs@dailymotion.com>
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code.
+*/
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCompat.h"
+
+/// Device information helper methods
+@interface SDDeviceHelper : NSObject
+
+#pragma mark - RAM
++ (NSUInteger)totalMemory;
++ (NSUInteger)freeMemory;
+
+#pragma mark - Screen
++ (double)screenScale;
++ (double)screenEDR;
++ (double)screenMaxEDR;
+
+@end
diff --git a/SDWebImage/Private/SDDeviceHelper.m b/SDWebImage/Private/SDDeviceHelper.m
new file mode 100644
index 000000000..98f48c527
--- /dev/null
+++ b/SDWebImage/Private/SDDeviceHelper.m
@@ -0,0 +1,98 @@
+/*
+* This file is part of the SDWebImage package.
+* (c) Olivier Poitrey <rs@dailymotion.com>
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code.
+*/
+
+#import "SDDeviceHelper.h"
+#import <mach/mach.h>
+#import <sys/sysctl.h>
+
+@implementation SDDeviceHelper
+
++ (NSUInteger)totalMemory {
+    return (NSUInteger)[[NSProcessInfo processInfo] physicalMemory];
+}
+
++ (NSUInteger)freeMemory {
+    mach_port_t host_port = mach_host_self();
+    mach_msg_type_number_t host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);
+    vm_size_t page_size;
+    vm_statistics_data_t vm_stat;
+    kern_return_t kern;
+    
+    kern = host_page_size(host_port, &page_size);
+    if (kern != KERN_SUCCESS) return 0;
+    kern = host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size);
+    if (kern != KERN_SUCCESS) return 0;
+    return vm_stat.free_count * page_size;
+}
+
++ (double)screenScale {
+#if SD_VISION
+    CGFloat screenScale = UITraitCollection.currentTraitCollection.displayScale;
+#elif SD_WATCH
+    CGFloat screenScale = [WKInterfaceDevice currentDevice].screenScale;
+#elif SD_UIKIT
+    CGFloat screenScale = [UIScreen mainScreen].scale;
+#elif SD_MAC
+    NSScreen *mainScreen = nil;
+    if (@available(macOS 10.12, *)) {
+        mainScreen = [NSScreen mainScreen];
+    } else {
+        mainScreen = [NSScreen screens].firstObject;
+    }
+    CGFloat screenScale = mainScreen.backingScaleFactor ?: 1.0f;
+#endif
+    return screenScale;
+}
+
++ (double)screenEDR {
+#if SD_VISION
+    // no API to query, but it's HDR ready, from the testing, the value is 200 nits
+    CGFloat EDR = 2.0;
+#elif SD_WATCH
+    // currently no HDR support, fallback to SDR
+    CGFloat EDR = 1.0;
+#elif SD_UIKIT
+    CGFloat EDR = 1.0;
+    if (@available(iOS 16.0, tvOS 16.0, *)) {
+        UIScreen *mainScreen = [UIScreen mainScreen];
+        EDR = mainScreen.currentEDRHeadroom;
+    }
+#elif SD_MAC
+    CGFloat EDR = 1.0;
+    if (@available(macOS 10.15, *)) {
+        NSScreen *mainScreen = [NSScreen mainScreen];
+        EDR = mainScreen.maximumExtendedDynamicRangeColorComponentValue;
+    }
+#endif
+    return EDR;
+}
+
++ (double)screenMaxEDR {
+#if SD_VISION
+    // no API to query, but it's HDR ready, from the testing, the value is 200 nits
+    CGFloat maxEDR = 2.0;
+#elif SD_WATCH
+    // currently no HDR support, fallback to SDR
+    CGFloat maxEDR = 1.0;
+#elif SD_UIKIT
+    CGFloat maxEDR = 1.0;
+    if (@available(iOS 16.0, tvOS 16.0, *)) {
+        UIScreen *mainScreen = [UIScreen mainScreen];
+        maxEDR = mainScreen.potentialEDRHeadroom;
+    }
+#elif SD_MAC
+    CGFloat maxEDR = 1.0;
+    if (@available(macOS 10.15, *)) {
+        NSScreen *mainScreen = [NSScreen mainScreen];
+        maxEDR = mainScreen.maximumPotentialExtendedDynamicRangeColorComponentValue;
+    }
+#endif
+    return maxEDR;
+}
+
+@end
diff --git a/SDWebImage/Private/SDDisplayLink.h b/SDWebImage/Private/SDDisplayLink.h
new file mode 100644
index 000000000..6582ccbf4
--- /dev/null
+++ b/SDWebImage/Private/SDDisplayLink.h
@@ -0,0 +1,29 @@
+/*
+* This file is part of the SDWebImage package.
+* (c) Olivier Poitrey <rs@dailymotion.com>
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code.
+*/
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCompat.h"
+
+/// Cross-platform display link wrapper. Do not retain the target
+/// Use `CADisplayLink` on iOS/tvOS, `CVDisplayLink` on macOS, `NSTimer` on watchOS
+@interface SDDisplayLink : NSObject
+
+@property (readonly, nonatomic, weak, nullable) id target;
+@property (readonly, nonatomic, assign, nonnull) SEL selector;
+@property (readonly, nonatomic) NSTimeInterval duration; // elapsed time in seconds of previous callback. (or it's first callback, use the time between `start` and callback). Always zero when display link not running
+@property (readonly, nonatomic) BOOL isRunning;
+
++ (nonnull instancetype)displayLinkWithTarget:(nonnull id)target selector:(nonnull SEL)sel;
+
+- (void)addToRunLoop:(nonnull NSRunLoop *)runloop forMode:(nonnull NSRunLoopMode)mode;
+- (void)removeFromRunLoop:(nonnull NSRunLoop *)runloop forMode:(nonnull NSRunLoopMode)mode;
+
+- (void)start;
+- (void)stop;
+
+@end
diff --git a/SDWebImage/Private/SDDisplayLink.m b/SDWebImage/Private/SDDisplayLink.m
new file mode 100644
index 000000000..aeae570d7
--- /dev/null
+++ b/SDWebImage/Private/SDDisplayLink.m
@@ -0,0 +1,292 @@
+/*
+* This file is part of the SDWebImage package.
+* (c) Olivier Poitrey <rs@dailymotion.com>
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code.
+*/
+
+#import "SDDisplayLink.h"
+#import "SDWeakProxy.h"
+#if SD_MAC
+#import <CoreVideo/CoreVideo.h>
+#elif SD_UIKIT
+#import <QuartzCore/QuartzCore.h>
+#endif
+#include <mach/mach_time.h>
+
+#if SD_MAC
+static CVReturn DisplayLinkCallback(CVDisplayLinkRef displayLink, const CVTimeStamp *inNow, const CVTimeStamp *inOutputTime, CVOptionFlags flagsIn, CVOptionFlags *flagsOut, void *displayLinkContext);
+#endif
+
+#if SD_UIKIT
+static BOOL kSDDisplayLinkUseTargetTimestamp = NO; // Use `next` fire time, or `previous` fire time (only for CADisplayLink)
+#endif
+
+#define kSDDisplayLinkInterval 1.0 / 60
+
+@interface SDDisplayLink ()
+
+@property (nonatomic, assign) NSTimeInterval previousFireTime;
+@property (nonatomic, assign) NSTimeInterval nextFireTime;
+
+#if SD_MAC
+@property (nonatomic, assign) CVDisplayLinkRef displayLink;
+@property (nonatomic, assign) CVTimeStamp outputTime;
+@property (nonatomic, copy) NSRunLoopMode runloopMode;
+#elif SD_UIKIT
+@property (nonatomic, strong) CADisplayLink *displayLink;
+#else
+@property (nonatomic, strong) NSTimer *displayLink;
+@property (nonatomic, strong) NSRunLoop *runloop;
+@property (nonatomic, copy) NSRunLoopMode runloopMode;
+#endif
+
+@end
+
+@implementation SDDisplayLink
+
+- (void)dealloc {
+#if SD_MAC
+    if (_displayLink) {
+        CVDisplayLinkStop(_displayLink);
+        CVDisplayLinkRelease(_displayLink);
+        _displayLink = NULL;
+    }
+#elif SD_UIKIT
+    [_displayLink invalidate];
+    _displayLink = nil;
+#else
+    [_displayLink invalidate];
+    _displayLink = nil;
+#endif
+}
+
+- (instancetype)initWithTarget:(id)target selector:(SEL)sel {
+    self = [super init];
+    if (self) {
+        _target = target;
+        _selector = sel;
+        // CA/CV/NSTimer will retain to the target, we need to break this using weak proxy
+        SDWeakProxy *weakProxy = [SDWeakProxy proxyWithTarget:self];
+#if SD_UIKIT
+        if (@available(iOS 10.0, tvOS 10.0, *)) {
+            // Use static bool, which is a little faster than runtime OS version check
+            kSDDisplayLinkUseTargetTimestamp = YES;
+        }
+#endif
+#if SD_MAC
+        CVDisplayLinkCreateWithActiveCGDisplays(&_displayLink);
+        // Simulate retain for target, the target is weak proxy to self
+        CVDisplayLinkSetOutputCallback(_displayLink, DisplayLinkCallback, (__bridge_retained void *)weakProxy);
+#elif SD_UIKIT
+        _displayLink = [CADisplayLink displayLinkWithTarget:weakProxy selector:@selector(displayLinkDidRefresh:)];
+#else
+        _displayLink = [NSTimer timerWithTimeInterval:kSDDisplayLinkInterval target:weakProxy selector:@selector(displayLinkDidRefresh:) userInfo:nil repeats:YES];
+#endif
+    }
+    return self;
+}
+
++ (instancetype)displayLinkWithTarget:(id)target selector:(SEL)sel {
+    SDDisplayLink *displayLink = [[SDDisplayLink alloc] initWithTarget:target selector:sel];
+    return displayLink;
+}
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunguarded-availability"
+- (NSTimeInterval)duration {
+    NSTimeInterval duration = 0;
+#if SD_MAC
+    CVTimeStamp outputTime = self.outputTime;
+    double periodPerSecond = (double)outputTime.videoTimeScale * outputTime.rateScalar;
+    if (periodPerSecond > 0) {
+        duration = (double)outputTime.videoRefreshPeriod / periodPerSecond;
+    }
+#elif SD_UIKIT
+    // iOS 10+ use current `targetTimestamp` - previous `targetTimestamp`
+    // See: WWDC Session 10147 - Optimize for variable refresh rate displays
+    if (kSDDisplayLinkUseTargetTimestamp) {
+        NSTimeInterval nextFireTime = self.nextFireTime;
+        if (nextFireTime != 0) {
+            duration = self.displayLink.targetTimestamp - nextFireTime;
+        } else {
+            // Invalid, fallback `duration`
+            duration = self.displayLink.duration;
+        }
+    } else {
+        // iOS 9 use current `timestamp` - previous `timestamp`
+        NSTimeInterval previousFireTime = self.previousFireTime;
+        if (previousFireTime != 0) {
+            duration = self.displayLink.timestamp - previousFireTime;
+        } else {
+            // Invalid, fallback `duration`
+            duration = self.displayLink.duration;
+        }
+    }
+#else
+    NSTimeInterval nextFireTime = self.nextFireTime;
+    if (nextFireTime != 0) {
+        // `CFRunLoopTimerGetNextFireDate`: This time could be a date in the past if a run loop has not been able to process the timer since the firing time arrived.
+        // Don't rely on this, always calculate based on elapsed time
+        duration = CFRunLoopTimerGetNextFireDate((__bridge CFRunLoopTimerRef)self.displayLink) - nextFireTime;
+    }
+#endif
+    // When system sleep, the targetTimestamp will mass up, fallback refresh rate
+    if (duration < 0) {
+#if SD_MAC
+        // Supports Pro display 120Hz
+        CGDirectDisplayID display = CVDisplayLinkGetCurrentCGDisplay(_displayLink);
+        CGDisplayModeRef mode = CGDisplayCopyDisplayMode(display);
+        if (mode) {
+            double refreshRate = CGDisplayModeGetRefreshRate(mode);
+            if (refreshRate > 0) {
+                duration = 1.0 / refreshRate;
+            } else {
+                duration = kSDDisplayLinkInterval;
+            }
+            CGDisplayModeRelease(mode);
+        } else {
+            duration = kSDDisplayLinkInterval;
+        }
+#elif SD_UIKIT
+        // Fallback
+        duration = self.displayLink.duration;
+#else
+        // Watch always 60Hz
+        duration = kSDDisplayLinkInterval;
+#endif
+    }
+    return duration;
+}
+#pragma clang diagnostic pop
+
+- (BOOL)isRunning {
+#if SD_MAC
+    return CVDisplayLinkIsRunning(self.displayLink);
+#elif SD_UIKIT
+    return !self.displayLink.isPaused;
+#else
+    return self.displayLink.isValid;
+#endif
+}
+
+- (void)addToRunLoop:(NSRunLoop *)runloop forMode:(NSRunLoopMode)mode {
+    if  (!runloop || !mode) {
+        return;
+    }
+#if SD_MAC
+    self.runloopMode = mode;
+#elif SD_UIKIT
+    [self.displayLink addToRunLoop:runloop forMode:mode];
+#else
+    self.runloop = runloop;
+    self.runloopMode = mode;
+    CFRunLoopMode cfMode;
+    if ([mode isEqualToString:NSDefaultRunLoopMode]) {
+        cfMode = kCFRunLoopDefaultMode;
+    } else if ([mode isEqualToString:NSRunLoopCommonModes]) {
+        cfMode = kCFRunLoopCommonModes;
+    } else {
+        cfMode = (__bridge CFStringRef)mode;
+    }
+    CFRunLoopAddTimer(runloop.getCFRunLoop, (__bridge CFRunLoopTimerRef)self.displayLink, cfMode);
+#endif
+}
+
+- (void)removeFromRunLoop:(NSRunLoop *)runloop forMode:(NSRunLoopMode)mode {
+    if  (!runloop || !mode) {
+        return;
+    }
+#if SD_MAC
+    self.runloopMode = nil;
+#elif SD_UIKIT
+    [self.displayLink removeFromRunLoop:runloop forMode:mode];
+#else
+    self.runloop = nil;
+    self.runloopMode = nil;
+    CFRunLoopMode cfMode;
+    if ([mode isEqualToString:NSDefaultRunLoopMode]) {
+        cfMode = kCFRunLoopDefaultMode;
+    } else if ([mode isEqualToString:NSRunLoopCommonModes]) {
+        cfMode = kCFRunLoopCommonModes;
+    } else {
+        cfMode = (__bridge CFStringRef)mode;
+    }
+    CFRunLoopRemoveTimer(runloop.getCFRunLoop, (__bridge CFRunLoopTimerRef)self.displayLink, cfMode);
+#endif
+}
+
+- (void)start {
+#if SD_MAC
+    CVDisplayLinkStart(self.displayLink);
+#elif SD_UIKIT
+    self.displayLink.paused = NO;
+#else
+    if (self.displayLink.isValid) {
+        // Do nothing
+    } else {
+        SDWeakProxy *weakProxy = [SDWeakProxy proxyWithTarget:self];
+        self.displayLink = [NSTimer timerWithTimeInterval:kSDDisplayLinkInterval target:weakProxy selector:@selector(displayLinkDidRefresh:) userInfo:nil repeats:YES];
+        [self addToRunLoop:self.runloop forMode:self.runloopMode];
+    }
+#endif
+}
+
+- (void)stop {
+#if SD_MAC
+    CVDisplayLinkStop(self.displayLink);
+#elif SD_UIKIT
+    self.displayLink.paused = YES;
+#else
+    [self.displayLink invalidate];
+#endif
+    self.previousFireTime = 0;
+    self.nextFireTime = 0;
+}
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunguarded-availability"
+- (void)displayLinkDidRefresh:(id)displayLink {
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
+    [_target performSelector:_selector withObject:self];
+#pragma clang diagnostic pop
+#if SD_UIKIT
+    if (kSDDisplayLinkUseTargetTimestamp) {
+        self.nextFireTime = self.displayLink.targetTimestamp;
+    } else {
+        self.previousFireTime = self.displayLink.timestamp;
+    }
+#endif
+#if SD_WATCH
+    self.nextFireTime = CFRunLoopTimerGetNextFireDate((__bridge CFRunLoopTimerRef)self.displayLink);
+#endif
+}
+#pragma clang diagnostic pop
+
+@end
+
+#if SD_MAC
+static CVReturn DisplayLinkCallback(CVDisplayLinkRef displayLink, const CVTimeStamp *inNow, const CVTimeStamp *inOutputTime, CVOptionFlags flagsIn, CVOptionFlags *flagsOut, void *displayLinkContext) {
+    @autoreleasepool {
+        // CVDisplayLink callback is not on main queue
+        // Actually `SDWeakProxy` but not `SDDisplayLink`
+        SDDisplayLink *object = (__bridge SDDisplayLink *)displayLinkContext;
+        if (!object) return kCVReturnSuccess;
+        // CVDisplayLink does not use runloop, but we can provide similar behavior for modes
+        // May use `default` runloop to avoid extra callback when in `eventTracking` (mouse drag, scroll) or `modalPanel` (modal panel)
+        NSString *runloopMode = object.runloopMode;
+        if (![runloopMode isEqualToString:NSRunLoopCommonModes] && ![runloopMode isEqualToString:NSRunLoop.mainRunLoop.currentMode]) {
+            return kCVReturnSuccess;
+        }
+        CVTimeStamp outputTime = inOutputTime ? *inOutputTime : *inNow;
+        // `SDWeakProxy` is weak, so it's safe to dispatch to main queue without leak
+        dispatch_async(dispatch_get_main_queue(), ^{
+            object.outputTime = outputTime;
+            [object displayLinkDidRefresh:(__bridge id)(displayLink)];
+        });
+        return kCVReturnSuccess;
+    }
+}
+#endif
diff --git a/SDWebImage/Private/SDFileAttributeHelper.h b/SDWebImage/Private/SDFileAttributeHelper.h
new file mode 100644
index 000000000..3ce6badec
--- /dev/null
+++ b/SDWebImage/Private/SDFileAttributeHelper.h
@@ -0,0 +1,19 @@
+//
+//  This file is from https://gist.github.com/zydeco/6292773
+//
+//  Created by Jesús A. Álvarez on 2008-12-17.
+//  Copyright 2008-2009 namedfork.net. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+/// File Extended Attribute (xattr) helper methods
+@interface SDFileAttributeHelper : NSObject
+
++ (nullable NSArray<NSString *> *)extendedAttributeNamesAtPath:(nonnull NSString *)path traverseLink:(BOOL)follow error:(NSError * _Nullable * _Nullable)err;
++ (BOOL)hasExtendedAttribute:(nonnull NSString *)name atPath:(nonnull NSString *)path traverseLink:(BOOL)follow error:(NSError * _Nullable * _Nullable)err;
++ (nullable NSData *)extendedAttribute:(nonnull NSString *)name atPath:(nonnull NSString *)path traverseLink:(BOOL)follow error:(NSError * _Nullable * _Nullable)err;
++ (BOOL)setExtendedAttribute:(nonnull NSString *)name value:(nonnull NSData *)value atPath:(nonnull NSString *)path traverseLink:(BOOL)follow overwrite:(BOOL)overwrite error:(NSError * _Nullable * _Nullable)err;
++ (BOOL)removeExtendedAttribute:(nonnull NSString *)name atPath:(nonnull NSString *)path traverseLink:(BOOL)follow error:(NSError * _Nullable * _Nullable)err;
+
+@end
diff --git a/SDWebImage/Private/SDFileAttributeHelper.m b/SDWebImage/Private/SDFileAttributeHelper.m
new file mode 100644
index 000000000..5122089d1
--- /dev/null
+++ b/SDWebImage/Private/SDFileAttributeHelper.m
@@ -0,0 +1,127 @@
+//
+//  This file is from https://gist.github.com/zydeco/6292773
+//
+//  Created by Jesús A. Álvarez on 2008-12-17.
+//  Copyright 2008-2009 namedfork.net. All rights reserved.
+//
+
+#import "SDFileAttributeHelper.h"
+#import <sys/xattr.h>
+
+@implementation SDFileAttributeHelper
+
++ (NSArray*)extendedAttributeNamesAtPath:(NSString *)path traverseLink:(BOOL)follow error:(NSError **)err {
+    int flags = follow? 0 : XATTR_NOFOLLOW;
+    
+    // get size of name list
+    ssize_t nameBuffLen = listxattr([path fileSystemRepresentation], NULL, 0, flags);
+    if (nameBuffLen == -1) {
+        if (err) *err = [NSError errorWithDomain:NSPOSIXErrorDomain code:errno userInfo:
+                         @{
+                             @"error": [NSString stringWithUTF8String:strerror(errno)],
+                             @"function": @"listxattr",
+                             @":path": path,
+                             @":traverseLink": @(follow)
+                         }
+                         ];
+        return nil;
+    } else if (nameBuffLen == 0) return @[];
+    
+    // get name list
+    NSMutableData *nameBuff = [NSMutableData dataWithLength:nameBuffLen];
+    listxattr([path fileSystemRepresentation], [nameBuff mutableBytes], nameBuffLen, flags);
+    
+    // convert to array
+    NSMutableArray * names = [NSMutableArray arrayWithCapacity:5];
+    char *nextName, *endOfNames = [nameBuff mutableBytes] + nameBuffLen;
+    for(nextName = [nameBuff mutableBytes]; nextName < endOfNames; nextName += 1+strlen(nextName))
+        [names addObject:[NSString stringWithUTF8String:nextName]];
+    return names.copy;
+}
+
++ (BOOL)hasExtendedAttribute:(NSString *)name atPath:(NSString *)path traverseLink:(BOOL)follow error:(NSError **)err {
+    int flags = follow? 0 : XATTR_NOFOLLOW;
+    
+    // get size of name list
+    ssize_t nameBuffLen = listxattr([path fileSystemRepresentation], NULL, 0, flags);
+    if (nameBuffLen == -1) {
+        if (err) *err = [NSError errorWithDomain:NSPOSIXErrorDomain code:errno userInfo:
+                         @{
+                             @"error": [NSString stringWithUTF8String:strerror(errno)],
+                             @"function": @"listxattr",
+                             @":path": path,
+                             @":traverseLink": @(follow)
+                         }
+                         ];
+        return NO;
+    } else if (nameBuffLen == 0) return NO;
+    
+    // get name list
+    NSMutableData *nameBuff = [NSMutableData dataWithLength:nameBuffLen];
+    listxattr([path fileSystemRepresentation], [nameBuff mutableBytes], nameBuffLen, flags);
+    
+    // find our name
+    char *nextName, *endOfNames = [nameBuff mutableBytes] + nameBuffLen;
+    for(nextName = [nameBuff mutableBytes]; nextName < endOfNames; nextName += 1+strlen(nextName))
+        if (strcmp(nextName, [name UTF8String]) == 0) return YES;
+    return NO;
+}
+
++ (NSData *)extendedAttribute:(NSString *)name atPath:(NSString *)path traverseLink:(BOOL)follow error:(NSError **)err {
+    int flags = follow? 0 : XATTR_NOFOLLOW;
+    // get length
+    ssize_t attrLen = getxattr([path fileSystemRepresentation], [name UTF8String], NULL, 0, 0, flags);
+    if (attrLen == -1) {
+        if (err) *err = [NSError errorWithDomain:NSPOSIXErrorDomain code:errno userInfo:
+                         @{
+                             @"error": [NSString stringWithUTF8String:strerror(errno)],
+                             @"function": @"getxattr",
+                             @":name": name,
+                             @":path": path,
+                             @":traverseLink": @(follow)
+                         }
+                         ];
+        return nil;
+    }
+    
+    // get attribute data
+    NSMutableData *attrData = [NSMutableData dataWithLength:attrLen];
+    getxattr([path fileSystemRepresentation], [name UTF8String], [attrData mutableBytes], attrLen, 0, flags);
+    return attrData;
+}
+
++ (BOOL)setExtendedAttribute:(NSString *)name value:(NSData *)value atPath:(NSString *)path traverseLink:(BOOL)follow overwrite:(BOOL)overwrite error:(NSError **)err {
+    int flags = (follow? 0 : XATTR_NOFOLLOW) | (overwrite? 0 : XATTR_CREATE);
+    if (0 == setxattr([path fileSystemRepresentation], [name UTF8String], [value bytes], [value length], 0, flags)) return YES;
+    // error
+    if (err) *err = [NSError errorWithDomain:NSPOSIXErrorDomain code:errno userInfo:
+                     @{
+                         @"error": [NSString stringWithUTF8String:strerror(errno)],
+                         @"function": @"setxattr",
+                         @":name": name,
+                         @":value.length": @(value.length),
+                         @":path": path,
+                         @":traverseLink": @(follow),
+                         @":overwrite": @(overwrite)
+                     }
+                     ];
+    return NO;
+}
+
++ (BOOL)removeExtendedAttribute:(NSString *)name atPath:(NSString *)path traverseLink:(BOOL)follow error:(NSError **)err {
+    int flags = (follow? 0 : XATTR_NOFOLLOW);
+    if (0 == removexattr([path fileSystemRepresentation], [name UTF8String], flags)) return YES;
+    // error
+    if (err) *err = [NSError errorWithDomain:NSPOSIXErrorDomain code:errno userInfo:
+                     @{
+                         @"error": [NSString stringWithUTF8String:strerror(errno)],
+                         @"function": @"removexattr",
+                         @":name": name,
+                         @":path": path,
+                         @":traverseLink": @(follow)
+                     }
+                     ];
+    return NO;
+}
+
+@end
diff --git a/SDWebImage/Private/SDImageAssetManager.h b/SDWebImage/Private/SDImageAssetManager.h
new file mode 100644
index 000000000..88dee4895
--- /dev/null
+++ b/SDWebImage/Private/SDImageAssetManager.h
@@ -0,0 +1,23 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCompat.h"
+
+/// A Image-Asset manager to work like UIKit/AppKit's image cache behavior
+/// Apple parse the Asset Catalog compiled file(`Assets.car`) by CoreUI.framework, however it's a private framework and there are no other ways to directly get the data. So we just process the normal bundle files :)
+@interface SDImageAssetManager : NSObject
+
+@property (nonatomic, strong, nonnull) NSMapTable<NSString *, UIImage *> *imageTable;
+
++ (nonnull instancetype)sharedAssetManager;
+- (nullable NSString *)getPathForName:(nonnull NSString *)name bundle:(nonnull NSBundle *)bundle preferredScale:(nonnull CGFloat *)scale;
+- (nullable UIImage *)imageForName:(nonnull NSString *)name;
+- (void)storeImage:(nonnull UIImage *)image forName:(nonnull NSString *)name;
+
+@end
diff --git a/SDWebImage/Private/SDImageAssetManager.m b/SDWebImage/Private/SDImageAssetManager.m
new file mode 100644
index 000000000..8ba3f967b
--- /dev/null
+++ b/SDWebImage/Private/SDImageAssetManager.m
@@ -0,0 +1,153 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDImageAssetManager.h"
+#import "SDInternalMacros.h"
+#import "SDDeviceHelper.h"
+
+static NSArray *SDBundlePreferredScales(void) {
+    static NSArray *scales;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        CGFloat screenScale = SDDeviceHelper.screenScale;
+        if (screenScale <= 1) {
+            scales = @[@1,@2,@3];
+        } else if (screenScale <= 2) {
+            scales = @[@2,@3,@1];
+        } else {
+            scales = @[@3,@2,@1];
+        }
+    });
+    return scales;
+}
+
+@implementation SDImageAssetManager {
+    SD_LOCK_DECLARE(_lock);
+}
+
++ (instancetype)sharedAssetManager {
+    static dispatch_once_t onceToken;
+    static SDImageAssetManager *assetManager;
+    dispatch_once(&onceToken, ^{
+        assetManager = [[SDImageAssetManager alloc] init];
+    });
+    return assetManager;
+}
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        NSPointerFunctionsOptions valueOptions;
+#if SD_MAC
+        // Apple says that NSImage use a weak reference to value
+        valueOptions = NSPointerFunctionsWeakMemory;
+#else
+        // Apple says that UIImage use a strong reference to value
+        valueOptions = NSPointerFunctionsStrongMemory;
+#endif
+        _imageTable = [NSMapTable mapTableWithKeyOptions:NSPointerFunctionsCopyIn valueOptions:valueOptions];
+        SD_LOCK_INIT(_lock);
+#if SD_UIKIT
+        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didReceiveMemoryWarning:) name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
+#endif
+    }
+    return self;
+}
+
+- (void)dealloc {
+#if SD_UIKIT
+    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
+#endif
+}
+
+- (void)didReceiveMemoryWarning:(NSNotification *)notification {
+    SD_LOCK(_lock);
+    [self.imageTable removeAllObjects];
+    SD_UNLOCK(_lock);
+}
+
+- (NSString *)getPathForName:(NSString *)name bundle:(NSBundle *)bundle preferredScale:(CGFloat *)scale {
+    NSParameterAssert(name);
+    NSParameterAssert(bundle);
+    NSString *path;
+    if (name.length == 0) {
+        return path;
+    }
+    if ([name hasSuffix:@"/"]) {
+        return path;
+    }
+    NSString *extension = name.pathExtension;
+    if (extension.length == 0) {
+        // If no extension, follow Apple's doc, check PNG format
+        extension = @"png";
+    }
+    name = [name stringByDeletingPathExtension];
+    
+    CGFloat providedScale = *scale;
+    NSArray *scales = SDBundlePreferredScales();
+    
+    // Check if file name contains scale
+    for (size_t i = 0; i < scales.count; i++) {
+        NSNumber *scaleValue = scales[i];
+        if ([name hasSuffix:[NSString stringWithFormat:@"@%@x", scaleValue]]) {
+            path = [bundle pathForResource:name ofType:extension];
+            if (path) {
+                *scale = scaleValue.doubleValue; // override
+                return path;
+            }
+        }
+    }
+    
+    // Search with provided scale first
+    if (providedScale != 0) {
+        NSString *scaledName = [name stringByAppendingFormat:@"@%@x", @(providedScale)];
+        path = [bundle pathForResource:scaledName ofType:extension];
+        if (path) {
+            return path;
+        }
+    }
+    
+    // Search with preferred scale
+    for (size_t i = 0; i < scales.count; i++) {
+        NSNumber *scaleValue = scales[i];
+        if (scaleValue.doubleValue == providedScale) {
+            // Ignore provided scale
+            continue;
+        }
+        NSString *scaledName = [name stringByAppendingFormat:@"@%@x", scaleValue];
+        path = [bundle pathForResource:scaledName ofType:extension];
+        if (path) {
+            *scale = scaleValue.doubleValue; // override
+            return path;
+        }
+    }
+    
+    // Search without scale
+    path = [bundle pathForResource:name ofType:extension];
+    
+    return path;
+}
+
+- (UIImage *)imageForName:(NSString *)name {
+    NSParameterAssert(name);
+    UIImage *image;
+    SD_LOCK(_lock);
+    image = [self.imageTable objectForKey:name];
+    SD_UNLOCK(_lock);
+    return image;
+}
+
+- (void)storeImage:(UIImage *)image forName:(NSString *)name {
+    NSParameterAssert(image);
+    NSParameterAssert(name);
+    SD_LOCK(_lock);
+    [self.imageTable setObject:image forKey:name];
+    SD_UNLOCK(_lock);
+}
+
+@end
diff --git a/SDWebImage/Private/SDImageCachesManagerOperation.h b/SDWebImage/Private/SDImageCachesManagerOperation.h
new file mode 100644
index 000000000..0debe6cac
--- /dev/null
+++ b/SDWebImage/Private/SDImageCachesManagerOperation.h
@@ -0,0 +1,21 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCompat.h"
+
+/// This is used for operation management, but not for operation queue execute
+@interface SDImageCachesManagerOperation : NSOperation
+
+@property (nonatomic, assign, readonly) NSUInteger pendingCount;
+
+- (void)beginWithTotalCount:(NSUInteger)totalCount;
+- (void)completeOne;
+- (void)done;
+
+@end
diff --git a/SDWebImage/Private/SDImageCachesManagerOperation.m b/SDWebImage/Private/SDImageCachesManagerOperation.m
new file mode 100644
index 000000000..1313b6839
--- /dev/null
+++ b/SDWebImage/Private/SDImageCachesManagerOperation.m
@@ -0,0 +1,83 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDImageCachesManagerOperation.h"
+#import "SDInternalMacros.h"
+
+@implementation SDImageCachesManagerOperation {
+    SD_LOCK_DECLARE(_pendingCountLock);
+}
+
+@synthesize executing = _executing;
+@synthesize finished = _finished;
+@synthesize cancelled = _cancelled;
+@synthesize pendingCount = _pendingCount;
+
+- (instancetype)init {
+    if (self = [super init]) {
+        SD_LOCK_INIT(_pendingCountLock);
+        _pendingCount = 0;
+    }
+    return self;
+}
+
+- (void)beginWithTotalCount:(NSUInteger)totalCount {
+    self.executing = YES;
+    self.finished = NO;
+    _pendingCount = totalCount;
+}
+
+- (NSUInteger)pendingCount {
+    SD_LOCK(_pendingCountLock);
+    NSUInteger pendingCount = _pendingCount;
+    SD_UNLOCK(_pendingCountLock);
+    return pendingCount;
+}
+
+- (void)completeOne {
+    SD_LOCK(_pendingCountLock);
+    _pendingCount = _pendingCount > 0 ? _pendingCount - 1 : 0;
+    SD_UNLOCK(_pendingCountLock);
+}
+
+- (void)cancel {
+    self.cancelled = YES;
+    [self reset];
+}
+
+- (void)done {
+    self.finished = YES;
+    self.executing = NO;
+    [self reset];
+}
+
+- (void)reset {
+    SD_LOCK(_pendingCountLock);
+    _pendingCount = 0;
+    SD_UNLOCK(_pendingCountLock);
+}
+
+- (void)setFinished:(BOOL)finished {
+    [self willChangeValueForKey:@"isFinished"];
+    _finished = finished;
+    [self didChangeValueForKey:@"isFinished"];
+}
+
+- (void)setExecuting:(BOOL)executing {
+    [self willChangeValueForKey:@"isExecuting"];
+    _executing = executing;
+    [self didChangeValueForKey:@"isExecuting"];
+}
+
+- (void)setCancelled:(BOOL)cancelled {
+    [self willChangeValueForKey:@"isCancelled"];
+    _cancelled = cancelled;
+    [self didChangeValueForKey:@"isCancelled"];
+}
+
+@end
diff --git a/SDWebImage/Private/SDImageFramePool.h b/SDWebImage/Private/SDImageFramePool.h
new file mode 100644
index 000000000..6fedc83fc
--- /dev/null
+++ b/SDWebImage/Private/SDImageFramePool.h
@@ -0,0 +1,40 @@
+/*
+* This file is part of the SDWebImage package.
+* (c) Olivier Poitrey <rs@dailymotion.com>
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code.
+*/
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCompat.h"
+#import "SDImageCoder.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+/// A per-provider (provider means, AnimatedImage object) based frame pool, each player who use the same provider share the same frame buffer
+@interface SDImageFramePool : NSObject
+
+/// Register and return back a frame pool, also increase reference count
++ (instancetype)registerProvider:(id<SDAnimatedImageProvider>)provider;
+/// Unregister a frame pool, also decrease reference count, if zero dealloc the frame pool
++ (void)unregisterProvider:(id<SDAnimatedImageProvider>)provider;
+
+/// Prefetch the current frame, query using `frameAtIndex:` by caller to check whether finished.
+- (void)prefetchFrameAtIndex:(NSUInteger)index;
+
+/// Control the max buffer count for current frame pool, used for RAM/CPU balance, default unlimited
+@property (nonatomic, assign) NSUInteger maxBufferCount;
+/// Control the max concurrent fetch queue operation count, used for CPU balance, default 1
+@property (nonatomic, assign) NSUInteger maxConcurrentCount;
+
+// Frame Operations
+@property (nonatomic, readonly) NSUInteger currentFrameCount;
+- (nullable UIImage *)frameAtIndex:(NSUInteger)index;
+- (void)setFrame:(nullable UIImage *)frame atIndex:(NSUInteger)index;
+- (void)removeFrameAtIndex:(NSUInteger)index;
+- (void)removeAllFrames;
+
+NS_ASSUME_NONNULL_END
+
+@end
diff --git a/SDWebImage/Private/SDImageFramePool.m b/SDWebImage/Private/SDImageFramePool.m
new file mode 100644
index 000000000..3426f4981
--- /dev/null
+++ b/SDWebImage/Private/SDImageFramePool.m
@@ -0,0 +1,168 @@
+/*
+* This file is part of the SDWebImage package.
+* (c) Olivier Poitrey <rs@dailymotion.com>
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code.
+*/
+
+#import "SDImageFramePool.h"
+#import "SDInternalMacros.h"
+#import "objc/runtime.h"
+
+@interface SDImageFramePool ()
+
+@property (class, readonly) NSMapTable *providerFramePoolMap;
+
+@property (weak) id<SDAnimatedImageProvider> provider;
+@property (atomic) NSUInteger registerCount;
+
+@property (nonatomic, strong) NSMutableDictionary<NSNumber *, UIImage *> *frameBuffer;
+@property (nonatomic, strong) NSOperationQueue *fetchQueue;
+
+@end
+
+// Lock to ensure atomic behavior
+SD_LOCK_DECLARE_STATIC(_providerFramePoolMapLock);
+
+@implementation SDImageFramePool
+
++ (NSMapTable *)providerFramePoolMap {
+    static NSMapTable *providerFramePoolMap;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        // Key use `hash` && `isEqual:`
+        providerFramePoolMap = [NSMapTable mapTableWithKeyOptions:NSPointerFunctionsStrongMemory | NSPointerFunctionsObjectPersonality valueOptions:NSPointerFunctionsStrongMemory | NSPointerFunctionsObjectPointerPersonality];
+    });
+    return providerFramePoolMap;
+}
+
+#pragma mark - Life Cycle
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        _frameBuffer = [NSMutableDictionary dictionary];
+        _fetchQueue = [[NSOperationQueue alloc] init];
+        _fetchQueue.maxConcurrentOperationCount = 1;
+        _fetchQueue.name = @"com.hackemist.SDImageFramePool.fetchQueue";
+#if SD_UIKIT
+        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didReceiveMemoryWarning:) name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
+#endif
+    }
+    return self;
+}
+
+- (void)dealloc {
+#if SD_UIKIT
+    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
+#endif
+}
+
+- (void)didReceiveMemoryWarning:(NSNotification *)notification {
+    [self removeAllFrames];
+}
+
++ (void)initialize {
+    // Lock to ensure atomic behavior
+    SD_LOCK_INIT(_providerFramePoolMapLock);
+}
+
++ (instancetype)registerProvider:(id<SDAnimatedImageProvider>)provider {
+    // Lock to ensure atomic behavior
+    SD_LOCK(_providerFramePoolMapLock);
+    SDImageFramePool *framePool = [self.providerFramePoolMap objectForKey:provider];
+    if (!framePool) {
+        framePool = [[SDImageFramePool alloc] init];
+        framePool.provider = provider;
+        [self.providerFramePoolMap setObject:framePool forKey:provider];
+    }
+    framePool.registerCount += 1;
+    SD_UNLOCK(_providerFramePoolMapLock);
+    return framePool;
+}
+
++ (void)unregisterProvider:(id<SDAnimatedImageProvider>)provider {
+    // Lock to ensure atomic behavior
+    SD_LOCK(_providerFramePoolMapLock);
+    SDImageFramePool *framePool = [self.providerFramePoolMap objectForKey:provider];
+    if (!framePool) {
+        SD_UNLOCK(_providerFramePoolMapLock);
+        return;
+    }
+    framePool.registerCount -= 1;
+    if (framePool.registerCount == 0) {
+        [self.providerFramePoolMap removeObjectForKey:provider];
+    }
+    SD_UNLOCK(_providerFramePoolMapLock);
+}
+
+- (void)prefetchFrameAtIndex:(NSUInteger)index {
+    @synchronized (self) {
+        NSUInteger frameCount = self.frameBuffer.count;
+        if (frameCount > self.maxBufferCount) {
+            // Remove the frame buffer if need
+            // TODO, use LRU or better algorithm to detect which frames to clear
+            self.frameBuffer[@(index - 1)] = nil;
+            self.frameBuffer[@(index + 1)] = nil;
+        }
+    }
+    
+    if (self.fetchQueue.operationCount == 0) {
+        // Prefetch next frame in background queue
+        @weakify(self);
+        NSOperation *operation = [NSBlockOperation blockOperationWithBlock:^{
+            @strongify(self);
+            if (!self) {
+                return;
+            }
+            id<SDAnimatedImageProvider> animatedProvider = self.provider;
+            if (!animatedProvider) {
+                return;
+            }
+            UIImage *frame = [animatedProvider animatedImageFrameAtIndex:index];
+            
+            [self setFrame:frame atIndex:index];
+        }];
+        [self.fetchQueue addOperation:operation];
+    }
+}
+
+- (void)setMaxConcurrentCount:(NSUInteger)maxConcurrentCount {
+    self.fetchQueue.maxConcurrentOperationCount = maxConcurrentCount;
+}
+
+- (NSUInteger)currentFrameCount {
+    NSUInteger frameCount = 0;
+    @synchronized (self) {
+        frameCount = self.frameBuffer.count;
+    }
+    return frameCount;
+}
+
+- (void)setFrame:(UIImage *)frame atIndex:(NSUInteger)index {
+    @synchronized (self) {
+        self.frameBuffer[@(index)] = frame;
+    }
+}
+
+- (UIImage *)frameAtIndex:(NSUInteger)index {
+    UIImage *frame;
+    @synchronized (self) {
+        frame = self.frameBuffer[@(index)];
+    }
+    return frame;
+}
+
+- (void)removeFrameAtIndex:(NSUInteger)index {
+    @synchronized (self) {
+        self.frameBuffer[@(index)] = nil;
+    }
+}
+
+- (void)removeAllFrames {
+    @synchronized (self) {
+        [self.frameBuffer removeAllObjects];
+    }
+}
+
+@end
diff --git a/SDWebImage/Private/SDImageIOAnimatedCoderInternal.h b/SDWebImage/Private/SDImageIOAnimatedCoderInternal.h
new file mode 100644
index 000000000..d24091aca
--- /dev/null
+++ b/SDWebImage/Private/SDImageIOAnimatedCoderInternal.h
@@ -0,0 +1,42 @@
+/*
+* This file is part of the SDWebImage package.
+* (c) Olivier Poitrey <rs@dailymotion.com>
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code.
+*/
+
+#import <Foundation/Foundation.h>
+#import <ImageIO/ImageIO.h>
+#import "SDImageIOAnimatedCoder.h"
+
+// Xcode 16 SDK contains HDR encoding API, but we still support Xcode 15
+#define SD_IMAGEIO_HDR_ENCODING (__IPHONE_OS_VERSION_MAX_ALLOWED >= 180000)
+
+// AVFileTypeHEIC/AVFileTypeHEIF is defined in AVFoundation via iOS 11, we use this without import AVFoundation
+#define kSDUTTypeHEIC  ((__bridge CFStringRef)@"public.heic")
+#define kSDUTTypeHEIF  ((__bridge CFStringRef)@"public.heif")
+// HEIC Sequence (Animated Image)
+#define kSDUTTypeHEICS ((__bridge CFStringRef)@"public.heics")
+// kSDUTTypeWebP seems not defined in public UTI framework, Apple use the hardcode string, we define them :)
+#define kSDUTTypeWebP  ((__bridge CFStringRef)@"org.webmproject.webp")
+
+#define kSDUTTypeImage ((__bridge CFStringRef)@"public.image")
+#define kSDUTTypeJPEG  ((__bridge CFStringRef)@"public.jpeg")
+#define kSDUTTypePNG   ((__bridge CFStringRef)@"public.png")
+#define kSDUTTypeTIFF  ((__bridge CFStringRef)@"public.tiff")
+#define kSDUTTypeSVG   ((__bridge CFStringRef)@"public.svg-image")
+#define kSDUTTypeGIF   ((__bridge CFStringRef)@"com.compuserve.gif")
+#define kSDUTTypePDF   ((__bridge CFStringRef)@"com.adobe.pdf")
+#define kSDUTTypeBMP   ((__bridge CFStringRef)@"com.microsoft.bmp")
+#define kSDUTTypeRAW   ((__bridge CFStringRef)@"public.camera-raw-image")
+
+@interface SDImageIOAnimatedCoder ()
+
++ (NSTimeInterval)frameDurationAtIndex:(NSUInteger)index source:(nonnull CGImageSourceRef)source;
++ (NSUInteger)imageLoopCountWithSource:(nonnull CGImageSourceRef)source;
++ (nullable UIImage *)createFrameAtIndex:(NSUInteger)index source:(nonnull CGImageSourceRef)source scale:(CGFloat)scale preserveAspectRatio:(BOOL)preserveAspectRatio thumbnailSize:(CGSize)thumbnailSize lazyDecode:(BOOL)lazyDecode animatedImage:(BOOL)animatedImage decodeToHDR:(BOOL)decodeToHDR;
++ (BOOL)canEncodeToFormat:(SDImageFormat)format;
++ (BOOL)canDecodeFromFormat:(SDImageFormat)format;
+
+@end
diff --git a/SDWebImage/Private/SDInternalMacros.h b/SDWebImage/Private/SDInternalMacros.h
new file mode 100644
index 000000000..c324cccf1
--- /dev/null
+++ b/SDWebImage/Private/SDInternalMacros.h
@@ -0,0 +1,195 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import <os/lock.h>
+#import <libkern/OSAtomic.h>
+#import <os/log.h>
+#import "SDmetamacros.h"
+
+#define SD_USE_OS_UNFAIR_LOCK TARGET_OS_MACCATALYST ||\
+    (__IPHONE_OS_VERSION_MIN_REQUIRED >= __IPHONE_10_0) ||\
+    (__MAC_OS_X_VERSION_MIN_REQUIRED >= __MAC_10_12) ||\
+    (__TV_OS_VERSION_MIN_REQUIRED >= __TVOS_10_0) ||\
+    (__WATCH_OS_VERSION_MIN_REQUIRED >= __WATCHOS_3_0)
+
+#ifndef SD_LOCK_DECLARE
+#if SD_USE_OS_UNFAIR_LOCK
+#define SD_LOCK_DECLARE(lock) os_unfair_lock lock
+#else
+#define SD_LOCK_DECLARE(lock) os_unfair_lock lock API_AVAILABLE(ios(10.0), tvos(10), watchos(3), macos(10.12)); \
+OSSpinLock lock##_deprecated;
+#endif
+#endif
+
+#ifndef SD_LOCK_DECLARE_STATIC
+#if SD_USE_OS_UNFAIR_LOCK
+#define SD_LOCK_DECLARE_STATIC(lock) static os_unfair_lock lock
+#else
+#define SD_LOCK_DECLARE_STATIC(lock) static os_unfair_lock lock API_AVAILABLE(ios(10.0), tvos(10), watchos(3), macos(10.12)); \
+static OSSpinLock lock##_deprecated;
+#endif
+#endif
+
+#ifndef SD_LOCK_INIT
+#if SD_USE_OS_UNFAIR_LOCK
+#define SD_LOCK_INIT(lock) lock = OS_UNFAIR_LOCK_INIT
+#else
+#define SD_LOCK_INIT(lock) if (@available(iOS 10, tvOS 10, watchOS 3, macOS 10.12, *)) lock = OS_UNFAIR_LOCK_INIT; \
+else lock##_deprecated = OS_SPINLOCK_INIT;
+#endif
+#endif
+
+#ifndef SD_LOCK
+#if SD_USE_OS_UNFAIR_LOCK
+#define SD_LOCK(lock) os_unfair_lock_lock(&lock)
+#else
+#define SD_LOCK(lock) if (@available(iOS 10, tvOS 10, watchOS 3, macOS 10.12, *)) os_unfair_lock_lock(&lock); \
+else OSSpinLockLock(&lock##_deprecated);
+#endif
+#endif
+
+#ifndef SD_UNLOCK
+#if SD_USE_OS_UNFAIR_LOCK
+#define SD_UNLOCK(lock) os_unfair_lock_unlock(&lock)
+#else
+#define SD_UNLOCK(lock) if (@available(iOS 10, tvOS 10, watchOS 3, macOS 10.12, *)) os_unfair_lock_unlock(&lock); \
+else OSSpinLockUnlock(&lock##_deprecated);
+#endif
+#endif
+
+#ifndef SD_OPTIONS_CONTAINS
+#define SD_OPTIONS_CONTAINS(options, value) (((options) & (value)) == (value))
+#endif
+
+#ifndef SD_CSTRING
+#define SD_CSTRING(str) #str
+#endif
+
+#ifndef SD_NSSTRING
+#define SD_NSSTRING(str) @(SD_CSTRING(str))
+#endif
+
+#ifndef SD_SEL_SPI
+#define SD_SEL_SPI(name) NSSelectorFromString([NSString stringWithFormat:@"_%@", SD_NSSTRING(name)])
+#endif
+
+FOUNDATION_EXPORT os_log_t sd_getDefaultLog(void);
+
+#ifndef SD_LOG
+#define SD_LOG(_log, ...) if (@available(iOS 10.0, tvOS 10.0, macOS 10.12, watchOS 3.0, *)) os_log(sd_getDefaultLog(), _log, ##__VA_ARGS__); \
+else NSLog(@(_log), ##__VA_ARGS__);
+#endif
+
+#ifndef weakify
+#define weakify(...) \
+sd_keywordify \
+metamacro_foreach_cxt(sd_weakify_,, __weak, __VA_ARGS__)
+#endif
+
+#ifndef strongify
+#define strongify(...) \
+sd_keywordify \
+_Pragma("clang diagnostic push") \
+_Pragma("clang diagnostic ignored \"-Wshadow\"") \
+metamacro_foreach(sd_strongify_,, __VA_ARGS__) \
+_Pragma("clang diagnostic pop")
+#endif
+
+#define sd_weakify_(INDEX, CONTEXT, VAR) \
+CONTEXT __typeof__(VAR) metamacro_concat(VAR, _weak_) = (VAR);
+
+#define sd_strongify_(INDEX, VAR) \
+__strong __typeof__(VAR) VAR = metamacro_concat(VAR, _weak_);
+
+#if DEBUG
+#define sd_keywordify autoreleasepool {}
+#else
+#define sd_keywordify try {} @catch (...) {}
+#endif
+
+#ifndef onExit
+#define onExit \
+sd_keywordify \
+__strong sd_cleanupBlock_t metamacro_concat(sd_exitBlock_, __LINE__) __attribute__((cleanup(sd_executeCleanupBlock), unused)) = ^
+#endif
+
+typedef void (^sd_cleanupBlock_t)(void);
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+    void sd_executeCleanupBlock (__strong sd_cleanupBlock_t *block);
+#if defined(__cplusplus)
+}
+#endif
+
+/**
+ * \@keypath allows compile-time verification of key paths. Given a real object
+ * receiver and key path:
+ *
+ * @code
+
+NSString *UTF8StringPath = @keypath(str.lowercaseString.UTF8String);
+// => @"lowercaseString.UTF8String"
+
+NSString *versionPath = @keypath(NSObject, version);
+// => @"version"
+
+NSString *lowercaseStringPath = @keypath(NSString.new, lowercaseString);
+// => @"lowercaseString"
+
+ * @endcode
+ *
+ * ... the macro returns an \c NSString containing all but the first path
+ * component or argument (e.g., @"lowercaseString.UTF8String", @"version").
+ *
+ * In addition to simply creating a key path, this macro ensures that the key
+ * path is valid at compile-time (causing a syntax error if not), and supports
+ * refactoring, such that changing the name of the property will also update any
+ * uses of \@keypath.
+ */
+#define keypath(...) \
+    _Pragma("clang diagnostic push") \
+    _Pragma("clang diagnostic ignored \"-Warc-repeated-use-of-weak\"") \
+    (NO).boolValue ? ((NSString * _Nonnull)nil) : ((NSString * _Nonnull)@(cStringKeypath(__VA_ARGS__))) \
+    _Pragma("clang diagnostic pop") \
+
+#define cStringKeypath(...) \
+    metamacro_if_eq(1, metamacro_argcount(__VA_ARGS__))(keypath1(__VA_ARGS__))(keypath2(__VA_ARGS__))
+
+#define keypath1(PATH) \
+    (((void)(NO && ((void)PATH, NO)), \
+    ({ char *__extobjckeypath__ = strchr(# PATH, '.'); NSCAssert(__extobjckeypath__, @"Provided key path is invalid."); __extobjckeypath__ + 1; })))
+
+#define keypath2(OBJ, PATH) \
+    (((void)(NO && ((void)OBJ.PATH, NO)), # PATH))
+
+/**
+ * \@collectionKeypath allows compile-time verification of key paths across collections NSArray/NSSet etc. Given a real object
+ * receiver, collection object receiver and related keypaths:
+ *
+ * @code
+ 
+ NSString *employeesFirstNamePath = @collectionKeypath(department.employees, Employee.new, firstName)
+ // => @"employees.firstName"
+ 
+ NSString *employeesFirstNamePath = @collectionKeypath(Department.new, employees, Employee.new, firstName)
+ // => @"employees.firstName"
+
+ * @endcode
+ *
+ */
+#define collectionKeypath(...) \
+    metamacro_if_eq(3, metamacro_argcount(__VA_ARGS__))(collectionKeypath3(__VA_ARGS__))(collectionKeypath4(__VA_ARGS__))
+
+#define collectionKeypath3(PATH, COLLECTION_OBJECT, COLLECTION_PATH) \
+    (YES).boolValue ? (NSString * _Nonnull)@((const char * _Nonnull)[[NSString stringWithFormat:@"%s.%s", cStringKeypath(PATH), cStringKeypath(COLLECTION_OBJECT, COLLECTION_PATH)] UTF8String]) : (NSString * _Nonnull)nil
+
+#define collectionKeypath4(OBJ, PATH, COLLECTION_OBJECT, COLLECTION_PATH) \
+    (YES).boolValue ? (NSString * _Nonnull)@((const char * _Nonnull)[[NSString stringWithFormat:@"%s.%s", cStringKeypath(OBJ, PATH), cStringKeypath(COLLECTION_OBJECT, COLLECTION_PATH)] UTF8String]) : (NSString * _Nonnull)nil
diff --git a/SDWebImage/Private/SDInternalMacros.m b/SDWebImage/Private/SDInternalMacros.m
new file mode 100644
index 000000000..939ba7054
--- /dev/null
+++ b/SDWebImage/Private/SDInternalMacros.m
@@ -0,0 +1,22 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDInternalMacros.h"
+
+os_log_t sd_getDefaultLog(void) {
+    static dispatch_once_t onceToken;
+    static os_log_t log;
+    dispatch_once(&onceToken, ^{
+        log = os_log_create("com.hackemist.SDWebImage", "Default");
+    });
+    return log;
+}
+
+void sd_executeCleanupBlock (__strong sd_cleanupBlock_t *block) {
+    (*block)();
+}
diff --git a/SDWebImage/Private/SDWeakProxy.h b/SDWebImage/Private/SDWeakProxy.h
new file mode 100644
index 000000000..d92c682be
--- /dev/null
+++ b/SDWebImage/Private/SDWeakProxy.h
@@ -0,0 +1,20 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCompat.h"
+
+/// A weak proxy which forward all the message to the target
+@interface SDWeakProxy : NSProxy
+
+@property (nonatomic, weak, readonly, nullable) id target;
+
+- (nonnull instancetype)initWithTarget:(nonnull id)target;
++ (nonnull instancetype)proxyWithTarget:(nonnull id)target;
+
+@end
diff --git a/SDWebImage/Private/SDWeakProxy.m b/SDWebImage/Private/SDWeakProxy.m
new file mode 100644
index 000000000..19a459314
--- /dev/null
+++ b/SDWebImage/Private/SDWeakProxy.m
@@ -0,0 +1,79 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWeakProxy.h"
+
+@implementation SDWeakProxy
+
+- (instancetype)initWithTarget:(id)target {
+    _target = target;
+    return self;
+}
+
++ (instancetype)proxyWithTarget:(id)target {
+    return [[SDWeakProxy alloc] initWithTarget:target];
+}
+
+- (id)forwardingTargetForSelector:(SEL)selector {
+    return _target;
+}
+
+- (void)forwardInvocation:(NSInvocation *)invocation {
+    void *null = NULL;
+    [invocation setReturnValue:&null];
+}
+
+- (NSMethodSignature *)methodSignatureForSelector:(SEL)selector {
+    return [NSObject instanceMethodSignatureForSelector:@selector(init)];
+}
+
+- (BOOL)respondsToSelector:(SEL)aSelector {
+    return [_target respondsToSelector:aSelector];
+}
+
+- (BOOL)isEqual:(id)object {
+    return [_target isEqual:object];
+}
+
+- (NSUInteger)hash {
+    return [_target hash];
+}
+
+- (Class)superclass {
+    return [_target superclass];
+}
+
+- (Class)class {
+    return [_target class];
+}
+
+- (BOOL)isKindOfClass:(Class)aClass {
+    return [_target isKindOfClass:aClass];
+}
+
+- (BOOL)isMemberOfClass:(Class)aClass {
+    return [_target isMemberOfClass:aClass];
+}
+
+- (BOOL)conformsToProtocol:(Protocol *)aProtocol {
+    return [_target conformsToProtocol:aProtocol];
+}
+
+- (BOOL)isProxy {
+    return YES;
+}
+
+- (NSString *)description {
+    return [_target description];
+}
+
+- (NSString *)debugDescription {
+    return [_target debugDescription];
+}
+
+@end
diff --git a/SDWebImage/Private/SDWebImageTransitionInternal.h b/SDWebImage/Private/SDWebImageTransitionInternal.h
new file mode 100644
index 000000000..1b70649a4
--- /dev/null
+++ b/SDWebImage/Private/SDWebImageTransitionInternal.h
@@ -0,0 +1,19 @@
+/*
+* This file is part of the SDWebImage package.
+* (c) Olivier Poitrey <rs@dailymotion.com>
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code.
+*/
+
+#import "SDWebImageCompat.h"
+
+#if SD_MAC
+
+#import <QuartzCore/QuartzCore.h>
+
+/// Helper method for Core Animation transition
+FOUNDATION_EXPORT CAMediaTimingFunction * _Nullable SDTimingFunctionFromAnimationOptions(SDWebImageAnimationOptions options);
+FOUNDATION_EXPORT CATransition * _Nullable SDTransitionFromAnimationOptions(SDWebImageAnimationOptions options);
+
+#endif
diff --git a/SDWebImage/Private/SDmetamacros.h b/SDWebImage/Private/SDmetamacros.h
new file mode 100644
index 000000000..dd90d99bb
--- /dev/null
+++ b/SDWebImage/Private/SDmetamacros.h
@@ -0,0 +1,667 @@
+/**
+ * Macros for metaprogramming
+ * ExtendedC
+ *
+ * Copyright (C) 2012 Justin Spahr-Summers
+ * Released under the MIT license
+ */
+
+#ifndef EXTC_METAMACROS_H
+#define EXTC_METAMACROS_H
+
+
+/**
+ * Executes one or more expressions (which may have a void type, such as a call
+ * to a function that returns no value) and always returns true.
+ */
+#define metamacro_exprify(...) \
+    ((__VA_ARGS__), true)
+
+/**
+ * Returns a string representation of VALUE after full macro expansion.
+ */
+#define metamacro_stringify(VALUE) \
+        metamacro_stringify_(VALUE)
+
+/**
+ * Returns A and B concatenated after full macro expansion.
+ */
+#define metamacro_concat(A, B) \
+        metamacro_concat_(A, B)
+
+/**
+ * Returns the Nth variadic argument (starting from zero). At least
+ * N + 1 variadic arguments must be given. N must be between zero and twenty,
+ * inclusive.
+ */
+#define metamacro_at(N, ...) \
+        metamacro_concat(metamacro_at, N)(__VA_ARGS__)
+
+/**
+ * Returns the number of arguments (up to twenty) provided to the macro. At
+ * least one argument must be provided.
+ *
+ * Inspired by P99: http://p99.gforge.inria.fr
+ */
+#define metamacro_argcount(...) \
+        metamacro_at(20, __VA_ARGS__, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1)
+
+/**
+ * Identical to #metamacro_foreach_cxt, except that no CONTEXT argument is
+ * given. Only the index and current argument will thus be passed to MACRO.
+ */
+#define metamacro_foreach(MACRO, SEP, ...) \
+        metamacro_foreach_cxt(metamacro_foreach_iter, SEP, MACRO, __VA_ARGS__)
+
+/**
+ * For each consecutive variadic argument (up to twenty), MACRO is passed the
+ * zero-based index of the current argument, CONTEXT, and then the argument
+ * itself. The results of adjoining invocations of MACRO are then separated by
+ * SEP.
+ *
+ * Inspired by P99: http://p99.gforge.inria.fr
+ */
+#define metamacro_foreach_cxt(MACRO, SEP, CONTEXT, ...) \
+        metamacro_concat(metamacro_foreach_cxt, metamacro_argcount(__VA_ARGS__))(MACRO, SEP, CONTEXT, __VA_ARGS__)
+
+/**
+ * Identical to #metamacro_foreach_cxt. This can be used when the former would
+ * fail due to recursive macro expansion.
+ */
+#define metamacro_foreach_cxt_recursive(MACRO, SEP, CONTEXT, ...) \
+        metamacro_concat(metamacro_foreach_cxt_recursive, metamacro_argcount(__VA_ARGS__))(MACRO, SEP, CONTEXT, __VA_ARGS__)
+
+/**
+ * In consecutive order, appends each variadic argument (up to twenty) onto
+ * BASE. The resulting concatenations are then separated by SEP.
+ *
+ * This is primarily useful to manipulate a list of macro invocations into instead
+ * invoking a different, possibly related macro.
+ */
+#define metamacro_foreach_concat(BASE, SEP, ...) \
+        metamacro_foreach_cxt(metamacro_foreach_concat_iter, SEP, BASE, __VA_ARGS__)
+
+/**
+ * Iterates COUNT times, each time invoking MACRO with the current index
+ * (starting at zero) and CONTEXT. The results of adjoining invocations of MACRO
+ * are then separated by SEP.
+ *
+ * COUNT must be an integer between zero and twenty, inclusive.
+ */
+#define metamacro_for_cxt(COUNT, MACRO, SEP, CONTEXT) \
+        metamacro_concat(metamacro_for_cxt, COUNT)(MACRO, SEP, CONTEXT)
+
+/**
+ * Returns the first argument given. At least one argument must be provided.
+ *
+ * This is useful when implementing a variadic macro, where you may have only
+ * one variadic argument, but no way to retrieve it (for example, because \c ...
+ * always needs to match at least one argument).
+ *
+ * @code
+
+#define varmacro(...) \
+    metamacro_head(__VA_ARGS__)
+
+ * @endcode
+ */
+#define metamacro_head(...) \
+        metamacro_head_(__VA_ARGS__, 0)
+
+/**
+ * Returns every argument except the first. At least two arguments must be
+ * provided.
+ */
+#define metamacro_tail(...) \
+        metamacro_tail_(__VA_ARGS__)
+
+/**
+ * Returns the first N (up to twenty) variadic arguments as a new argument list.
+ * At least N variadic arguments must be provided.
+ */
+#define metamacro_take(N, ...) \
+        metamacro_concat(metamacro_take, N)(__VA_ARGS__)
+
+/**
+ * Removes the first N (up to twenty) variadic arguments from the given argument
+ * list. At least N variadic arguments must be provided.
+ */
+#define metamacro_drop(N, ...) \
+        metamacro_concat(metamacro_drop, N)(__VA_ARGS__)
+
+/**
+ * Decrements VAL, which must be a number between zero and twenty, inclusive.
+ *
+ * This is primarily useful when dealing with indexes and counts in
+ * metaprogramming.
+ */
+#define metamacro_dec(VAL) \
+        metamacro_at(VAL, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
+
+/**
+ * Increments VAL, which must be a number between zero and twenty, inclusive.
+ *
+ * This is primarily useful when dealing with indexes and counts in
+ * metaprogramming.
+ */
+#define metamacro_inc(VAL) \
+        metamacro_at(VAL, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
+
+/**
+ * If A is equal to B, the next argument list is expanded; otherwise, the
+ * argument list after that is expanded. A and B must be numbers between zero
+ * and twenty, inclusive. Additionally, B must be greater than or equal to A.
+ *
+ * @code
+
+// expands to true
+metamacro_if_eq(0, 0)(true)(false)
+
+// expands to false
+metamacro_if_eq(0, 1)(true)(false)
+
+ * @endcode
+ *
+ * This is primarily useful when dealing with indexes and counts in
+ * metaprogramming.
+ */
+#define metamacro_if_eq(A, B) \
+        metamacro_concat(metamacro_if_eq, A)(B)
+
+/**
+ * Identical to #metamacro_if_eq. This can be used when the former would fail
+ * due to recursive macro expansion.
+ */
+#define metamacro_if_eq_recursive(A, B) \
+        metamacro_concat(metamacro_if_eq_recursive, A)(B)
+
+/**
+ * Returns 1 if N is an even number, or 0 otherwise. N must be between zero and
+ * twenty, inclusive.
+ *
+ * For the purposes of this test, zero is considered even.
+ */
+#define metamacro_is_even(N) \
+        metamacro_at(N, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1)
+
+/**
+ * Returns the logical NOT of B, which must be the number zero or one.
+ */
+#define metamacro_not(B) \
+        metamacro_at(B, 1, 0)
+
+// IMPLEMENTATION DETAILS FOLLOW!
+// Do not write code that depends on anything below this line.
+#define metamacro_stringify_(VALUE) # VALUE
+#define metamacro_concat_(A, B) A ## B
+#define metamacro_foreach_iter(INDEX, MACRO, ARG) MACRO(INDEX, ARG)
+#define metamacro_head_(FIRST, ...) FIRST
+#define metamacro_tail_(FIRST, ...) __VA_ARGS__
+#define metamacro_consume_(...)
+#define metamacro_expand_(...) __VA_ARGS__
+
+// implemented from scratch so that metamacro_concat() doesn't end up nesting
+#define metamacro_foreach_concat_iter(INDEX, BASE, ARG) metamacro_foreach_concat_iter_(BASE, ARG)
+#define metamacro_foreach_concat_iter_(BASE, ARG) BASE ## ARG
+
+// metamacro_at expansions
+#define metamacro_at0(...) metamacro_head(__VA_ARGS__)
+#define metamacro_at1(_0, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at2(_0, _1, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at3(_0, _1, _2, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at4(_0, _1, _2, _3, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at5(_0, _1, _2, _3, _4, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at6(_0, _1, _2, _3, _4, _5, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at7(_0, _1, _2, _3, _4, _5, _6, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at8(_0, _1, _2, _3, _4, _5, _6, _7, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at9(_0, _1, _2, _3, _4, _5, _6, _7, _8, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at10(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at11(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at12(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at13(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at14(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at15(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at16(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at17(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at18(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at19(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at20(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, ...) metamacro_head(__VA_ARGS__)
+
+// metamacro_foreach_cxt expansions
+#define metamacro_foreach_cxt0(MACRO, SEP, CONTEXT)
+#define metamacro_foreach_cxt1(MACRO, SEP, CONTEXT, _0) MACRO(0, CONTEXT, _0)
+
+#define metamacro_foreach_cxt2(MACRO, SEP, CONTEXT, _0, _1) \
+    metamacro_foreach_cxt1(MACRO, SEP, CONTEXT, _0) \
+    SEP \
+    MACRO(1, CONTEXT, _1)
+
+#define metamacro_foreach_cxt3(MACRO, SEP, CONTEXT, _0, _1, _2) \
+    metamacro_foreach_cxt2(MACRO, SEP, CONTEXT, _0, _1) \
+    SEP \
+    MACRO(2, CONTEXT, _2)
+
+#define metamacro_foreach_cxt4(MACRO, SEP, CONTEXT, _0, _1, _2, _3) \
+    metamacro_foreach_cxt3(MACRO, SEP, CONTEXT, _0, _1, _2) \
+    SEP \
+    MACRO(3, CONTEXT, _3)
+
+#define metamacro_foreach_cxt5(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4) \
+    metamacro_foreach_cxt4(MACRO, SEP, CONTEXT, _0, _1, _2, _3) \
+    SEP \
+    MACRO(4, CONTEXT, _4)
+
+#define metamacro_foreach_cxt6(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5) \
+    metamacro_foreach_cxt5(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4) \
+    SEP \
+    MACRO(5, CONTEXT, _5)
+
+#define metamacro_foreach_cxt7(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6) \
+    metamacro_foreach_cxt6(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5) \
+    SEP \
+    MACRO(6, CONTEXT, _6)
+
+#define metamacro_foreach_cxt8(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7) \
+    metamacro_foreach_cxt7(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6) \
+    SEP \
+    MACRO(7, CONTEXT, _7)
+
+#define metamacro_foreach_cxt9(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8) \
+    metamacro_foreach_cxt8(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7) \
+    SEP \
+    MACRO(8, CONTEXT, _8)
+
+#define metamacro_foreach_cxt10(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9) \
+    metamacro_foreach_cxt9(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8) \
+    SEP \
+    MACRO(9, CONTEXT, _9)
+
+#define metamacro_foreach_cxt11(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10) \
+    metamacro_foreach_cxt10(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9) \
+    SEP \
+    MACRO(10, CONTEXT, _10)
+
+#define metamacro_foreach_cxt12(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11) \
+    metamacro_foreach_cxt11(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10) \
+    SEP \
+    MACRO(11, CONTEXT, _11)
+
+#define metamacro_foreach_cxt13(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12) \
+    metamacro_foreach_cxt12(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11) \
+    SEP \
+    MACRO(12, CONTEXT, _12)
+
+#define metamacro_foreach_cxt14(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13) \
+    metamacro_foreach_cxt13(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12) \
+    SEP \
+    MACRO(13, CONTEXT, _13)
+
+#define metamacro_foreach_cxt15(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14) \
+    metamacro_foreach_cxt14(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13) \
+    SEP \
+    MACRO(14, CONTEXT, _14)
+
+#define metamacro_foreach_cxt16(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15) \
+    metamacro_foreach_cxt15(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14) \
+    SEP \
+    MACRO(15, CONTEXT, _15)
+
+#define metamacro_foreach_cxt17(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16) \
+    metamacro_foreach_cxt16(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15) \
+    SEP \
+    MACRO(16, CONTEXT, _16)
+
+#define metamacro_foreach_cxt18(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17) \
+    metamacro_foreach_cxt17(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16) \
+    SEP \
+    MACRO(17, CONTEXT, _17)
+
+#define metamacro_foreach_cxt19(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18) \
+    metamacro_foreach_cxt18(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17) \
+    SEP \
+    MACRO(18, CONTEXT, _18)
+
+#define metamacro_foreach_cxt20(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19) \
+    metamacro_foreach_cxt19(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18) \
+    SEP \
+    MACRO(19, CONTEXT, _19)
+
+// metamacro_foreach_cxt_recursive expansions
+#define metamacro_foreach_cxt_recursive0(MACRO, SEP, CONTEXT)
+#define metamacro_foreach_cxt_recursive1(MACRO, SEP, CONTEXT, _0) MACRO(0, CONTEXT, _0)
+
+#define metamacro_foreach_cxt_recursive2(MACRO, SEP, CONTEXT, _0, _1) \
+    metamacro_foreach_cxt_recursive1(MACRO, SEP, CONTEXT, _0) \
+    SEP \
+    MACRO(1, CONTEXT, _1)
+
+#define metamacro_foreach_cxt_recursive3(MACRO, SEP, CONTEXT, _0, _1, _2) \
+    metamacro_foreach_cxt_recursive2(MACRO, SEP, CONTEXT, _0, _1) \
+    SEP \
+    MACRO(2, CONTEXT, _2)
+
+#define metamacro_foreach_cxt_recursive4(MACRO, SEP, CONTEXT, _0, _1, _2, _3) \
+    metamacro_foreach_cxt_recursive3(MACRO, SEP, CONTEXT, _0, _1, _2) \
+    SEP \
+    MACRO(3, CONTEXT, _3)
+
+#define metamacro_foreach_cxt_recursive5(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4) \
+    metamacro_foreach_cxt_recursive4(MACRO, SEP, CONTEXT, _0, _1, _2, _3) \
+    SEP \
+    MACRO(4, CONTEXT, _4)
+
+#define metamacro_foreach_cxt_recursive6(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5) \
+    metamacro_foreach_cxt_recursive5(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4) \
+    SEP \
+    MACRO(5, CONTEXT, _5)
+
+#define metamacro_foreach_cxt_recursive7(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6) \
+    metamacro_foreach_cxt_recursive6(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5) \
+    SEP \
+    MACRO(6, CONTEXT, _6)
+
+#define metamacro_foreach_cxt_recursive8(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7) \
+    metamacro_foreach_cxt_recursive7(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6) \
+    SEP \
+    MACRO(7, CONTEXT, _7)
+
+#define metamacro_foreach_cxt_recursive9(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8) \
+    metamacro_foreach_cxt_recursive8(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7) \
+    SEP \
+    MACRO(8, CONTEXT, _8)
+
+#define metamacro_foreach_cxt_recursive10(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9) \
+    metamacro_foreach_cxt_recursive9(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8) \
+    SEP \
+    MACRO(9, CONTEXT, _9)
+
+#define metamacro_foreach_cxt_recursive11(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10) \
+    metamacro_foreach_cxt_recursive10(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9) \
+    SEP \
+    MACRO(10, CONTEXT, _10)
+
+#define metamacro_foreach_cxt_recursive12(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11) \
+    metamacro_foreach_cxt_recursive11(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10) \
+    SEP \
+    MACRO(11, CONTEXT, _11)
+
+#define metamacro_foreach_cxt_recursive13(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12) \
+    metamacro_foreach_cxt_recursive12(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11) \
+    SEP \
+    MACRO(12, CONTEXT, _12)
+
+#define metamacro_foreach_cxt_recursive14(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13) \
+    metamacro_foreach_cxt_recursive13(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12) \
+    SEP \
+    MACRO(13, CONTEXT, _13)
+
+#define metamacro_foreach_cxt_recursive15(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14) \
+    metamacro_foreach_cxt_recursive14(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13) \
+    SEP \
+    MACRO(14, CONTEXT, _14)
+
+#define metamacro_foreach_cxt_recursive16(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15) \
+    metamacro_foreach_cxt_recursive15(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14) \
+    SEP \
+    MACRO(15, CONTEXT, _15)
+
+#define metamacro_foreach_cxt_recursive17(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16) \
+    metamacro_foreach_cxt_recursive16(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15) \
+    SEP \
+    MACRO(16, CONTEXT, _16)
+
+#define metamacro_foreach_cxt_recursive18(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17) \
+    metamacro_foreach_cxt_recursive17(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16) \
+    SEP \
+    MACRO(17, CONTEXT, _17)
+
+#define metamacro_foreach_cxt_recursive19(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18) \
+    metamacro_foreach_cxt_recursive18(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17) \
+    SEP \
+    MACRO(18, CONTEXT, _18)
+
+#define metamacro_foreach_cxt_recursive20(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19) \
+    metamacro_foreach_cxt_recursive19(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18) \
+    SEP \
+    MACRO(19, CONTEXT, _19)
+
+// metamacro_for_cxt expansions
+#define metamacro_for_cxt0(MACRO, SEP, CONTEXT)
+#define metamacro_for_cxt1(MACRO, SEP, CONTEXT) MACRO(0, CONTEXT)
+
+#define metamacro_for_cxt2(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt1(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(1, CONTEXT)
+
+#define metamacro_for_cxt3(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt2(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(2, CONTEXT)
+
+#define metamacro_for_cxt4(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt3(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(3, CONTEXT)
+
+#define metamacro_for_cxt5(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt4(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(4, CONTEXT)
+
+#define metamacro_for_cxt6(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt5(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(5, CONTEXT)
+
+#define metamacro_for_cxt7(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt6(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(6, CONTEXT)
+
+#define metamacro_for_cxt8(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt7(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(7, CONTEXT)
+
+#define metamacro_for_cxt9(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt8(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(8, CONTEXT)
+
+#define metamacro_for_cxt10(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt9(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(9, CONTEXT)
+
+#define metamacro_for_cxt11(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt10(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(10, CONTEXT)
+
+#define metamacro_for_cxt12(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt11(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(11, CONTEXT)
+
+#define metamacro_for_cxt13(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt12(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(12, CONTEXT)
+
+#define metamacro_for_cxt14(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt13(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(13, CONTEXT)
+
+#define metamacro_for_cxt15(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt14(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(14, CONTEXT)
+
+#define metamacro_for_cxt16(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt15(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(15, CONTEXT)
+
+#define metamacro_for_cxt17(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt16(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(16, CONTEXT)
+
+#define metamacro_for_cxt18(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt17(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(17, CONTEXT)
+
+#define metamacro_for_cxt19(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt18(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(18, CONTEXT)
+
+#define metamacro_for_cxt20(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt19(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(19, CONTEXT)
+
+// metamacro_if_eq expansions
+#define metamacro_if_eq0(VALUE) \
+    metamacro_concat(metamacro_if_eq0_, VALUE)
+
+#define metamacro_if_eq0_0(...) __VA_ARGS__ metamacro_consume_
+#define metamacro_if_eq0_1(...) metamacro_expand_
+#define metamacro_if_eq0_2(...) metamacro_expand_
+#define metamacro_if_eq0_3(...) metamacro_expand_
+#define metamacro_if_eq0_4(...) metamacro_expand_
+#define metamacro_if_eq0_5(...) metamacro_expand_
+#define metamacro_if_eq0_6(...) metamacro_expand_
+#define metamacro_if_eq0_7(...) metamacro_expand_
+#define metamacro_if_eq0_8(...) metamacro_expand_
+#define metamacro_if_eq0_9(...) metamacro_expand_
+#define metamacro_if_eq0_10(...) metamacro_expand_
+#define metamacro_if_eq0_11(...) metamacro_expand_
+#define metamacro_if_eq0_12(...) metamacro_expand_
+#define metamacro_if_eq0_13(...) metamacro_expand_
+#define metamacro_if_eq0_14(...) metamacro_expand_
+#define metamacro_if_eq0_15(...) metamacro_expand_
+#define metamacro_if_eq0_16(...) metamacro_expand_
+#define metamacro_if_eq0_17(...) metamacro_expand_
+#define metamacro_if_eq0_18(...) metamacro_expand_
+#define metamacro_if_eq0_19(...) metamacro_expand_
+#define metamacro_if_eq0_20(...) metamacro_expand_
+
+#define metamacro_if_eq1(VALUE) metamacro_if_eq0(metamacro_dec(VALUE))
+#define metamacro_if_eq2(VALUE) metamacro_if_eq1(metamacro_dec(VALUE))
+#define metamacro_if_eq3(VALUE) metamacro_if_eq2(metamacro_dec(VALUE))
+#define metamacro_if_eq4(VALUE) metamacro_if_eq3(metamacro_dec(VALUE))
+#define metamacro_if_eq5(VALUE) metamacro_if_eq4(metamacro_dec(VALUE))
+#define metamacro_if_eq6(VALUE) metamacro_if_eq5(metamacro_dec(VALUE))
+#define metamacro_if_eq7(VALUE) metamacro_if_eq6(metamacro_dec(VALUE))
+#define metamacro_if_eq8(VALUE) metamacro_if_eq7(metamacro_dec(VALUE))
+#define metamacro_if_eq9(VALUE) metamacro_if_eq8(metamacro_dec(VALUE))
+#define metamacro_if_eq10(VALUE) metamacro_if_eq9(metamacro_dec(VALUE))
+#define metamacro_if_eq11(VALUE) metamacro_if_eq10(metamacro_dec(VALUE))
+#define metamacro_if_eq12(VALUE) metamacro_if_eq11(metamacro_dec(VALUE))
+#define metamacro_if_eq13(VALUE) metamacro_if_eq12(metamacro_dec(VALUE))
+#define metamacro_if_eq14(VALUE) metamacro_if_eq13(metamacro_dec(VALUE))
+#define metamacro_if_eq15(VALUE) metamacro_if_eq14(metamacro_dec(VALUE))
+#define metamacro_if_eq16(VALUE) metamacro_if_eq15(metamacro_dec(VALUE))
+#define metamacro_if_eq17(VALUE) metamacro_if_eq16(metamacro_dec(VALUE))
+#define metamacro_if_eq18(VALUE) metamacro_if_eq17(metamacro_dec(VALUE))
+#define metamacro_if_eq19(VALUE) metamacro_if_eq18(metamacro_dec(VALUE))
+#define metamacro_if_eq20(VALUE) metamacro_if_eq19(metamacro_dec(VALUE))
+
+// metamacro_if_eq_recursive expansions
+#define metamacro_if_eq_recursive0(VALUE) \
+    metamacro_concat(metamacro_if_eq_recursive0_, VALUE)
+
+#define metamacro_if_eq_recursive0_0(...) __VA_ARGS__ metamacro_consume_
+#define metamacro_if_eq_recursive0_1(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_2(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_3(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_4(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_5(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_6(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_7(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_8(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_9(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_10(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_11(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_12(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_13(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_14(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_15(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_16(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_17(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_18(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_19(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_20(...) metamacro_expand_
+
+#define metamacro_if_eq_recursive1(VALUE) metamacro_if_eq_recursive0(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive2(VALUE) metamacro_if_eq_recursive1(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive3(VALUE) metamacro_if_eq_recursive2(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive4(VALUE) metamacro_if_eq_recursive3(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive5(VALUE) metamacro_if_eq_recursive4(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive6(VALUE) metamacro_if_eq_recursive5(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive7(VALUE) metamacro_if_eq_recursive6(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive8(VALUE) metamacro_if_eq_recursive7(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive9(VALUE) metamacro_if_eq_recursive8(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive10(VALUE) metamacro_if_eq_recursive9(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive11(VALUE) metamacro_if_eq_recursive10(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive12(VALUE) metamacro_if_eq_recursive11(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive13(VALUE) metamacro_if_eq_recursive12(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive14(VALUE) metamacro_if_eq_recursive13(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive15(VALUE) metamacro_if_eq_recursive14(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive16(VALUE) metamacro_if_eq_recursive15(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive17(VALUE) metamacro_if_eq_recursive16(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive18(VALUE) metamacro_if_eq_recursive17(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive19(VALUE) metamacro_if_eq_recursive18(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive20(VALUE) metamacro_if_eq_recursive19(metamacro_dec(VALUE))
+
+// metamacro_take expansions
+#define metamacro_take0(...)
+#define metamacro_take1(...) metamacro_head(__VA_ARGS__)
+#define metamacro_take2(...) metamacro_head(__VA_ARGS__), metamacro_take1(metamacro_tail(__VA_ARGS__))
+#define metamacro_take3(...) metamacro_head(__VA_ARGS__), metamacro_take2(metamacro_tail(__VA_ARGS__))
+#define metamacro_take4(...) metamacro_head(__VA_ARGS__), metamacro_take3(metamacro_tail(__VA_ARGS__))
+#define metamacro_take5(...) metamacro_head(__VA_ARGS__), metamacro_take4(metamacro_tail(__VA_ARGS__))
+#define metamacro_take6(...) metamacro_head(__VA_ARGS__), metamacro_take5(metamacro_tail(__VA_ARGS__))
+#define metamacro_take7(...) metamacro_head(__VA_ARGS__), metamacro_take6(metamacro_tail(__VA_ARGS__))
+#define metamacro_take8(...) metamacro_head(__VA_ARGS__), metamacro_take7(metamacro_tail(__VA_ARGS__))
+#define metamacro_take9(...) metamacro_head(__VA_ARGS__), metamacro_take8(metamacro_tail(__VA_ARGS__))
+#define metamacro_take10(...) metamacro_head(__VA_ARGS__), metamacro_take9(metamacro_tail(__VA_ARGS__))
+#define metamacro_take11(...) metamacro_head(__VA_ARGS__), metamacro_take10(metamacro_tail(__VA_ARGS__))
+#define metamacro_take12(...) metamacro_head(__VA_ARGS__), metamacro_take11(metamacro_tail(__VA_ARGS__))
+#define metamacro_take13(...) metamacro_head(__VA_ARGS__), metamacro_take12(metamacro_tail(__VA_ARGS__))
+#define metamacro_take14(...) metamacro_head(__VA_ARGS__), metamacro_take13(metamacro_tail(__VA_ARGS__))
+#define metamacro_take15(...) metamacro_head(__VA_ARGS__), metamacro_take14(metamacro_tail(__VA_ARGS__))
+#define metamacro_take16(...) metamacro_head(__VA_ARGS__), metamacro_take15(metamacro_tail(__VA_ARGS__))
+#define metamacro_take17(...) metamacro_head(__VA_ARGS__), metamacro_take16(metamacro_tail(__VA_ARGS__))
+#define metamacro_take18(...) metamacro_head(__VA_ARGS__), metamacro_take17(metamacro_tail(__VA_ARGS__))
+#define metamacro_take19(...) metamacro_head(__VA_ARGS__), metamacro_take18(metamacro_tail(__VA_ARGS__))
+#define metamacro_take20(...) metamacro_head(__VA_ARGS__), metamacro_take19(metamacro_tail(__VA_ARGS__))
+
+// metamacro_drop expansions
+#define metamacro_drop0(...) __VA_ARGS__
+#define metamacro_drop1(...) metamacro_tail(__VA_ARGS__)
+#define metamacro_drop2(...) metamacro_drop1(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop3(...) metamacro_drop2(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop4(...) metamacro_drop3(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop5(...) metamacro_drop4(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop6(...) metamacro_drop5(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop7(...) metamacro_drop6(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop8(...) metamacro_drop7(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop9(...) metamacro_drop8(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop10(...) metamacro_drop9(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop11(...) metamacro_drop10(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop12(...) metamacro_drop11(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop13(...) metamacro_drop12(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop14(...) metamacro_drop13(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop15(...) metamacro_drop14(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop16(...) metamacro_drop15(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop17(...) metamacro_drop16(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop18(...) metamacro_drop17(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop19(...) metamacro_drop18(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop20(...) metamacro_drop19(metamacro_tail(__VA_ARGS__))
+
+#endif
diff --git a/SDWebImage/Private/UIColor+SDHexString.h b/SDWebImage/Private/UIColor+SDHexString.h
new file mode 100644
index 000000000..cf67186fc
--- /dev/null
+++ b/SDWebImage/Private/UIColor+SDHexString.h
@@ -0,0 +1,18 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+
+@interface UIColor (SDHexString)
+
+/**
+ Convenience way to get hex string from color. The output should always be 32-bit RGBA hex string like `#00000000`.
+ */
+@property (nonatomic, copy, readonly, nonnull) NSString *sd_hexString;
+
+@end
diff --git a/SDWebImage/Private/UIColor+SDHexString.m b/SDWebImage/Private/UIColor+SDHexString.m
new file mode 100644
index 000000000..7b43c411e
--- /dev/null
+++ b/SDWebImage/Private/UIColor+SDHexString.m
@@ -0,0 +1,42 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "UIColor+SDHexString.h"
+
+@implementation UIColor (SDHexString)
+
+- (NSString *)sd_hexString {
+    CGFloat red, green, blue, alpha;
+#if SD_UIKIT
+    if (![self getRed:&red green:&green blue:&blue alpha:&alpha]) {
+        [self getWhite:&red alpha:&alpha];
+        green = red;
+        blue = red;
+    }
+#else
+    @try {
+        [self getRed:&red green:&green blue:&blue alpha:&alpha];
+    }
+    @catch (NSException *exception) {
+        [self getWhite:&red alpha:&alpha];
+        green = red;
+        blue = red;
+    }
+#endif
+    
+    red = roundf(red * 255.f);
+    green = roundf(green * 255.f);
+    blue = roundf(blue * 255.f);
+    alpha = roundf(alpha * 255.f);
+    
+    uint hex = ((uint)alpha << 24) | ((uint)red << 16) | ((uint)green << 8) | ((uint)blue);
+    
+    return [NSString stringWithFormat:@"#%08x", hex];
+}
+
+@end
diff --git a/SDWebImage/Resources/PrivacyInfo.xcprivacy b/SDWebImage/Resources/PrivacyInfo.xcprivacy
new file mode 120000
index 000000000..44bc9be3b
--- /dev/null
+++ b/SDWebImage/Resources/PrivacyInfo.xcprivacy
@@ -0,0 +1 @@
+../../WebImage/PrivacyInfo.xcprivacy
\ No newline at end of file
diff --git a/SDWebImage/SDAnimatedImageRep.h b/SDWebImage/SDAnimatedImageRep.h
deleted file mode 100644
index c794c4b85..000000000
--- a/SDWebImage/SDAnimatedImageRep.h
+++ /dev/null
@@ -1,20 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "SDWebImageCompat.h"
-
-#if SD_MAC
-
-// A subclass of `NSBitmapImageRep` to fix that GIF loop count issue because `NSBitmapImageRep` will reset `NSImageCurrentFrameDuration` by using `kCGImagePropertyGIFDelayTime` but not `kCGImagePropertyGIFUnclampedDelayTime`.
-// Built in GIF coder use this instead of `NSBitmapImageRep` for better GIF rendering. If you do not want this, only enable `SDWebImageImageIOCoder`, which just call `NSImage` API and actually use `NSBitmapImageRep` for GIF image.
-
-@interface SDAnimatedImageRep : NSBitmapImageRep
-
-@end
-
-#endif
diff --git a/SDWebImage/SDAnimatedImageRep.m b/SDWebImage/SDAnimatedImageRep.m
deleted file mode 100644
index f0907d5c9..000000000
--- a/SDWebImage/SDAnimatedImageRep.m
+++ /dev/null
@@ -1,66 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "SDAnimatedImageRep.h"
-
-#if SD_MAC
-
-#import "SDWebImageGIFCoder.h"
-
-@interface SDWebImageGIFCoder ()
-
-- (float)sd_frameDurationAtIndex:(NSUInteger)index source:(CGImageSourceRef)source;
-
-@end
-
-@interface SDAnimatedImageRep ()
-
-@property (nonatomic, assign, readonly, nullable) CGImageSourceRef imageSource;
-
-@end
-
-@implementation SDAnimatedImageRep
-
-// `NSBitmapImageRep` will use `kCGImagePropertyGIFDelayTime` whenever you call `setProperty:withValue:` with `NSImageCurrentFrame` to change the current frame. We override it and use the actual `kCGImagePropertyGIFUnclampedDelayTime` if need.
-- (void)setProperty:(NSBitmapImageRepPropertyKey)property withValue:(id)value {
-    [super setProperty:property withValue:value];
-    if ([property isEqualToString:NSImageCurrentFrame]) {
-        // Access the image source
-        CGImageSourceRef imageSource = self.imageSource;
-        if (!imageSource) {
-            return;
-        }
-        // Check format type
-        CFStringRef type = CGImageSourceGetType(imageSource);
-        if (!type) {
-            return;
-        }
-        NSUInteger index = [value unsignedIntegerValue];
-        float frameDuration = 0;
-        // Through we currently process GIF only, in the 5.x we support APNG so we keep the extensibility
-        if (CFStringCompare(type, kUTTypeGIF, 0) == kCFCompareEqualTo) {
-            frameDuration = [[SDWebImageGIFCoder sharedCoder] sd_frameDurationAtIndex:index source:imageSource];
-        }
-        if (!frameDuration) {
-            return;
-        }
-        // Reset super frame duration with the actual frame duration
-        [super setProperty:NSImageCurrentFrameDuration withValue:@(frameDuration)];
-    }
-}
-
-- (CGImageSourceRef)imageSource {
-    if (_tiffData) {
-        return (__bridge CGImageSourceRef)(_tiffData);
-    }
-    return NULL;
-}
-
-@end
-
-#endif
diff --git a/SDWebImage/SDImageCache.h b/SDWebImage/SDImageCache.h
deleted file mode 100644
index ce2598970..000000000
--- a/SDWebImage/SDImageCache.h
+++ /dev/null
@@ -1,310 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import <Foundation/Foundation.h>
-#import "SDWebImageCompat.h"
-#import "SDImageCacheConfig.h"
-
-typedef NS_ENUM(NSInteger, SDImageCacheType) {
-    /**
-     * The image wasn't available the SDWebImage caches, but was downloaded from the web.
-     */
-    SDImageCacheTypeNone,
-    /**
-     * The image was obtained from the disk cache.
-     */
-    SDImageCacheTypeDisk,
-    /**
-     * The image was obtained from the memory cache.
-     */
-    SDImageCacheTypeMemory
-};
-
-typedef NS_OPTIONS(NSUInteger, SDImageCacheOptions) {
-    /**
-     * By default, we do not query disk data when the image is cached in memory. This mask can force to query disk data at the same time.
-     */
-    SDImageCacheQueryDataWhenInMemory = 1 << 0,
-    /**
-     * By default, we query the memory cache synchronously, disk cache asynchronously. This mask can force to query disk cache synchronously.
-     */
-    SDImageCacheQueryDiskSync = 1 << 1,
-    /**
-     * By default, images are decoded respecting their original size. On iOS, this flag will scale down the
-     * images to a size compatible with the constrained memory of devices.
-     */
-    SDImageCacheScaleDownLargeImages = 1 << 2
-};
-
-typedef void(^SDCacheQueryCompletedBlock)(UIImage * _Nullable image, NSData * _Nullable data, SDImageCacheType cacheType);
-
-typedef void(^SDWebImageCheckCacheCompletionBlock)(BOOL isInCache);
-
-typedef void(^SDWebImageCalculateSizeBlock)(NSUInteger fileCount, NSUInteger totalSize);
-
-
-/**
- * SDImageCache maintains a memory cache and an optional disk cache. Disk cache write operations are performed
- * asynchronous so it doesn’t add unnecessary latency to the UI.
- */
-@interface SDImageCache : NSObject
-
-#pragma mark - Properties
-
-/**
- *  Cache Config object - storing all kind of settings
- */
-@property (nonatomic, nonnull, readonly) SDImageCacheConfig *config;
-
-/**
- * The maximum "total cost" of the in-memory image cache. The cost function is the number of pixels held in memory.
- */
-@property (assign, nonatomic) NSUInteger maxMemoryCost;
-
-/**
- * The maximum number of objects the cache should hold.
- */
-@property (assign, nonatomic) NSUInteger maxMemoryCountLimit;
-
-#pragma mark - Singleton and initialization
-
-/**
- * Returns global shared cache instance
- *
- * @return SDImageCache global instance
- */
-+ (nonnull instancetype)sharedImageCache;
-
-/**
- * Init a new cache store with a specific namespace
- *
- * @param ns The namespace to use for this cache store
- */
-- (nonnull instancetype)initWithNamespace:(nonnull NSString *)ns;
-
-/**
- * Init a new cache store with a specific namespace and directory
- *
- * @param ns        The namespace to use for this cache store
- * @param directory Directory to cache disk images in
- */
-- (nonnull instancetype)initWithNamespace:(nonnull NSString *)ns
-                       diskCacheDirectory:(nonnull NSString *)directory NS_DESIGNATED_INITIALIZER;
-
-#pragma mark - Cache paths
-
-- (nullable NSString *)makeDiskCachePath:(nonnull NSString*)fullNamespace;
-
-/**
- * Add a read-only cache path to search for images pre-cached by SDImageCache
- * Useful if you want to bundle pre-loaded images with your app
- *
- * @param path The path to use for this read-only cache path
- */
-- (void)addReadOnlyCachePath:(nonnull NSString *)path;
-
-#pragma mark - Store Ops
-
-/**
- * Asynchronously store an image into memory and disk cache at the given key.
- *
- * @param image           The image to store
- * @param key             The unique image cache key, usually it's image absolute URL
- * @param completionBlock A block executed after the operation is finished
- */
-- (void)storeImage:(nullable UIImage *)image
-            forKey:(nullable NSString *)key
-        completion:(nullable SDWebImageNoParamsBlock)completionBlock;
-
-/**
- * Asynchronously store an image into memory and disk cache at the given key.
- *
- * @param image           The image to store
- * @param key             The unique image cache key, usually it's image absolute URL
- * @param toDisk          Store the image to disk cache if YES
- * @param completionBlock A block executed after the operation is finished
- */
-- (void)storeImage:(nullable UIImage *)image
-            forKey:(nullable NSString *)key
-            toDisk:(BOOL)toDisk
-        completion:(nullable SDWebImageNoParamsBlock)completionBlock;
-
-/**
- * Asynchronously store an image into memory and disk cache at the given key.
- *
- * @param image           The image to store
- * @param imageData       The image data as returned by the server, this representation will be used for disk storage
- *                        instead of converting the given image object into a storable/compressed image format in order
- *                        to save quality and CPU
- * @param key             The unique image cache key, usually it's image absolute URL
- * @param toDisk          Store the image to disk cache if YES
- * @param completionBlock A block executed after the operation is finished
- */
-- (void)storeImage:(nullable UIImage *)image
-         imageData:(nullable NSData *)imageData
-            forKey:(nullable NSString *)key
-            toDisk:(BOOL)toDisk
-        completion:(nullable SDWebImageNoParamsBlock)completionBlock;
-
-/**
- * Synchronously store image NSData into disk cache at the given key.
- *
- *
- * @param imageData  The image data to store
- * @param key        The unique image cache key, usually it's image absolute URL
- */
-- (void)storeImageDataToDisk:(nullable NSData *)imageData forKey:(nullable NSString *)key;
-
-#pragma mark - Query and Retrieve Ops
-
-/**
- *  Async check if image exists in disk cache already (does not load the image)
- *
- *  @param key             the key describing the url
- *  @param completionBlock the block to be executed when the check is done.
- *  @note the completion block will be always executed on the main queue
- */
-- (void)diskImageExistsWithKey:(nullable NSString *)key completion:(nullable SDWebImageCheckCacheCompletionBlock)completionBlock;
-
-/**
- *  Sync check if image data exists in disk cache already (does not load the image)
- *
- *  @param key             the key describing the url
- */
-- (BOOL)diskImageDataExistsWithKey:(nullable NSString *)key;
-
-/**
- *  Query the image data for the given key synchronously.
- *
- *  @param key The unique key used to store the wanted image
- *  @return The image data for the given key, or nil if not found.
- */
-- (nullable NSData *)diskImageDataForKey:(nullable NSString *)key;
-
-/**
- * Operation that queries the cache asynchronously and call the completion when done.
- *
- * @param key       The unique key used to store the wanted image
- * @param doneBlock The completion block. Will not get called if the operation is cancelled
- *
- * @return a NSOperation instance containing the cache op
- */
-- (nullable NSOperation *)queryCacheOperationForKey:(nullable NSString *)key done:(nullable SDCacheQueryCompletedBlock)doneBlock;
-
-/**
- * Operation that queries the cache asynchronously and call the completion when done.
- *
- * @param key       The unique key used to store the wanted image
- * @param options   A mask to specify options to use for this cache query
- * @param doneBlock The completion block. Will not get called if the operation is cancelled
- *
- * @return a NSOperation instance containing the cache op
- */
-- (nullable NSOperation *)queryCacheOperationForKey:(nullable NSString *)key options:(SDImageCacheOptions)options done:(nullable SDCacheQueryCompletedBlock)doneBlock;
-
-/**
- * Query the memory cache synchronously.
- *
- * @param key The unique key used to store the image
- * @return The image for the given key, or nil if not found.
- */
-- (nullable UIImage *)imageFromMemoryCacheForKey:(nullable NSString *)key;
-
-/**
- * Query the disk cache synchronously.
- *
- * @param key The unique key used to store the image
- * @return The image for the given key, or nil if not found.
- */
-- (nullable UIImage *)imageFromDiskCacheForKey:(nullable NSString *)key;
-
-/**
- * Query the cache (memory and or disk) synchronously after checking the memory cache.
- *
- * @param key The unique key used to store the image
- * @return The image for the given key, or nil if not found.
- */
-- (nullable UIImage *)imageFromCacheForKey:(nullable NSString *)key;
-
-#pragma mark - Remove Ops
-
-/**
- * Remove the image from memory and disk cache asynchronously
- *
- * @param key             The unique image cache key
- * @param completion      A block that should be executed after the image has been removed (optional)
- */
-- (void)removeImageForKey:(nullable NSString *)key withCompletion:(nullable SDWebImageNoParamsBlock)completion;
-
-/**
- * Remove the image from memory and optionally disk cache asynchronously
- *
- * @param key             The unique image cache key
- * @param fromDisk        Also remove cache entry from disk if YES
- * @param completion      A block that should be executed after the image has been removed (optional)
- */
-- (void)removeImageForKey:(nullable NSString *)key fromDisk:(BOOL)fromDisk withCompletion:(nullable SDWebImageNoParamsBlock)completion;
-
-#pragma mark - Cache clean Ops
-
-/**
- * Clear all memory cached images
- */
-- (void)clearMemory;
-
-/**
- * Async clear all disk cached images. Non-blocking method - returns immediately.
- * @param completion    A block that should be executed after cache expiration completes (optional)
- */
-- (void)clearDiskOnCompletion:(nullable SDWebImageNoParamsBlock)completion;
-
-/**
- * Async remove all expired cached image from disk. Non-blocking method - returns immediately.
- * @param completionBlock A block that should be executed after cache expiration completes (optional)
- */
-- (void)deleteOldFilesWithCompletionBlock:(nullable SDWebImageNoParamsBlock)completionBlock;
-
-#pragma mark - Cache Info
-
-/**
- * Get the size used by the disk cache
- */
-- (NSUInteger)getSize;
-
-/**
- * Get the number of images in the disk cache
- */
-- (NSUInteger)getDiskCount;
-
-/**
- * Asynchronously calculate the disk cache's size.
- */
-- (void)calculateSizeWithCompletionBlock:(nullable SDWebImageCalculateSizeBlock)completionBlock;
-
-#pragma mark - Cache Paths
-
-/**
- *  Get the cache path for a certain key (needs the cache path root folder)
- *
- *  @param key  the key (can be obtained from url using cacheKeyForURL)
- *  @param path the cache path root folder
- *
- *  @return the cache path
- */
-- (nullable NSString *)cachePathForKey:(nullable NSString *)key inPath:(nonnull NSString *)path;
-
-/**
- *  Get the default cache path for a certain key
- *
- *  @param key the key (can be obtained from url using cacheKeyForURL)
- *
- *  @return the default cache path
- */
-- (nullable NSString *)defaultCachePathForKey:(nullable NSString *)key;
-
-@end
diff --git a/SDWebImage/SDImageCache.m b/SDWebImage/SDImageCache.m
deleted file mode 100644
index 8e116d181..000000000
--- a/SDWebImage/SDImageCache.m
+++ /dev/null
@@ -1,811 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "SDImageCache.h"
-#import <CommonCrypto/CommonDigest.h>
-#import "NSImage+WebCache.h"
-#import "SDWebImageCodersManager.h"
-
-#define LOCK(lock) dispatch_semaphore_wait(lock, DISPATCH_TIME_FOREVER);
-#define UNLOCK(lock) dispatch_semaphore_signal(lock);
-
-FOUNDATION_STATIC_INLINE NSUInteger SDCacheCostForImage(UIImage *image) {
-#if SD_MAC
-    return image.size.height * image.size.width;
-#elif SD_UIKIT || SD_WATCH
-    return image.size.height * image.size.width * image.scale * image.scale;
-#endif
-}
-
-// A memory cache which auto purge the cache on memory warning and support weak cache.
-@interface SDMemoryCache <KeyType, ObjectType> : NSCache <KeyType, ObjectType>
-
-@end
-
-// Private
-@interface SDMemoryCache <KeyType, ObjectType> ()
-
-@property (nonatomic, strong, nonnull) SDImageCacheConfig *config;
-@property (nonatomic, strong, nonnull) NSMapTable<KeyType, ObjectType> *weakCache; // strong-weak cache
-@property (nonatomic, strong, nonnull) dispatch_semaphore_t weakCacheLock; // a lock to keep the access to `weakCache` thread-safe
-
-- (instancetype)init NS_UNAVAILABLE;
-- (instancetype)initWithConfig:(nonnull SDImageCacheConfig *)config;
-
-@end
-
-@implementation SDMemoryCache
-
-// Current this seems no use on macOS (macOS use virtual memory and do not clear cache when memory warning). So we only override on iOS/tvOS platform.
-// But in the future there may be more options and features for this subclass.
-#if SD_UIKIT
-
-- (void)dealloc {
-    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
-}
-
-- (instancetype)initWithConfig:(SDImageCacheConfig *)config {
-    self = [super init];
-    if (self) {
-        // Use a strong-weak maptable storing the secondary cache. Follow the doc that NSCache does not copy keys
-        // This is useful when the memory warning, the cache was purged. However, the image instance can be retained by other instance such as imageViews and alive.
-        // At this case, we can sync weak cache back and do not need to load from disk cache
-        self.weakCache = [[NSMapTable alloc] initWithKeyOptions:NSPointerFunctionsStrongMemory valueOptions:NSPointerFunctionsWeakMemory capacity:0];
-        self.weakCacheLock = dispatch_semaphore_create(1);
-        self.config = config;
-        [[NSNotificationCenter defaultCenter] addObserver:self
-                                                 selector:@selector(didReceiveMemoryWarning:)
-                                                     name:UIApplicationDidReceiveMemoryWarningNotification
-                                                   object:nil];
-    }
-    return self;
-}
-
-- (void)didReceiveMemoryWarning:(NSNotification *)notification {
-    // Only remove cache, but keep weak cache
-    [super removeAllObjects];
-}
-
-// `setObject:forKey:` just call this with 0 cost. Override this is enough
-- (void)setObject:(id)obj forKey:(id)key cost:(NSUInteger)g {
-    [super setObject:obj forKey:key cost:g];
-    if (!self.config.shouldUseWeakMemoryCache) {
-        return;
-    }
-    if (key && obj) {
-        // Store weak cache
-        LOCK(self.weakCacheLock);
-        [self.weakCache setObject:obj forKey:key];
-        UNLOCK(self.weakCacheLock);
-    }
-}
-
-- (id)objectForKey:(id)key {
-    id obj = [super objectForKey:key];
-    if (!self.config.shouldUseWeakMemoryCache) {
-        return obj;
-    }
-    if (key && !obj) {
-        // Check weak cache
-        LOCK(self.weakCacheLock);
-        obj = [self.weakCache objectForKey:key];
-        UNLOCK(self.weakCacheLock);
-        if (obj) {
-            // Sync cache
-            NSUInteger cost = 0;
-            if ([obj isKindOfClass:[UIImage class]]) {
-                cost = SDCacheCostForImage(obj);
-            }
-            [super setObject:obj forKey:key cost:cost];
-        }
-    }
-    return obj;
-}
-
-- (void)removeObjectForKey:(id)key {
-    [super removeObjectForKey:key];
-    if (!self.config.shouldUseWeakMemoryCache) {
-        return;
-    }
-    if (key) {
-        // Remove weak cache
-        LOCK(self.weakCacheLock);
-        [self.weakCache removeObjectForKey:key];
-        UNLOCK(self.weakCacheLock);
-    }
-}
-
-- (void)removeAllObjects {
-    [super removeAllObjects];
-    if (!self.config.shouldUseWeakMemoryCache) {
-        return;
-    }
-    // Manually remove should also remove weak cache
-    LOCK(self.weakCacheLock);
-    [self.weakCache removeAllObjects];
-    UNLOCK(self.weakCacheLock);
-}
-
-#else
-
-- (instancetype)initWithConfig:(SDImageCacheConfig *)config {
-    self = [super init];
-    return self;
-}
-
-#endif
-
-@end
-
-@interface SDImageCache ()
-
-#pragma mark - Properties
-@property (strong, nonatomic, nonnull) SDMemoryCache *memCache;
-@property (strong, nonatomic, nonnull) NSString *diskCachePath;
-@property (strong, nonatomic, nullable) NSMutableArray<NSString *> *customPaths;
-@property (strong, nonatomic, nullable) dispatch_queue_t ioQueue;
-@property (strong, nonatomic, nonnull) NSFileManager *fileManager;
-
-@end
-
-
-@implementation SDImageCache
-
-#pragma mark - Singleton, init, dealloc
-
-+ (nonnull instancetype)sharedImageCache {
-    static dispatch_once_t once;
-    static id instance;
-    dispatch_once(&once, ^{
-        instance = [self new];
-    });
-    return instance;
-}
-
-- (instancetype)init {
-    return [self initWithNamespace:@"default"];
-}
-
-- (nonnull instancetype)initWithNamespace:(nonnull NSString *)ns {
-    NSString *path = [self makeDiskCachePath:ns];
-    return [self initWithNamespace:ns diskCacheDirectory:path];
-}
-
-- (nonnull instancetype)initWithNamespace:(nonnull NSString *)ns
-                       diskCacheDirectory:(nonnull NSString *)directory {
-    if ((self = [super init])) {
-        NSString *fullNamespace = [@"com.hackemist.SDWebImageCache." stringByAppendingString:ns];
-        
-        // Create IO serial queue
-        _ioQueue = dispatch_queue_create("com.hackemist.SDWebImageCache", DISPATCH_QUEUE_SERIAL);
-        
-        _config = [[SDImageCacheConfig alloc] init];
-        
-        // Init the memory cache
-        _memCache = [[SDMemoryCache alloc] initWithConfig:_config];
-        _memCache.name = fullNamespace;
-
-        // Init the disk cache
-        if (directory != nil) {
-            _diskCachePath = [directory stringByAppendingPathComponent:fullNamespace];
-        } else {
-            NSString *path = [self makeDiskCachePath:ns];
-            _diskCachePath = path;
-        }
-
-        dispatch_sync(_ioQueue, ^{
-            self.fileManager = [NSFileManager new];
-        });
-
-#if SD_UIKIT
-        // Subscribe to app events
-        [[NSNotificationCenter defaultCenter] addObserver:self
-                                                 selector:@selector(deleteOldFiles)
-                                                     name:UIApplicationWillTerminateNotification
-                                                   object:nil];
-
-        [[NSNotificationCenter defaultCenter] addObserver:self
-                                                 selector:@selector(backgroundDeleteOldFiles)
-                                                     name:UIApplicationDidEnterBackgroundNotification
-                                                   object:nil];
-#endif
-    }
-
-    return self;
-}
-
-- (void)dealloc {
-    [[NSNotificationCenter defaultCenter] removeObserver:self];
-}
-
-#pragma mark - Cache paths
-
-- (void)addReadOnlyCachePath:(nonnull NSString *)path {
-    if (!self.customPaths) {
-        self.customPaths = [NSMutableArray new];
-    }
-
-    if (![self.customPaths containsObject:path]) {
-        [self.customPaths addObject:path];
-    }
-}
-
-- (nullable NSString *)cachePathForKey:(nullable NSString *)key inPath:(nonnull NSString *)path {
-    NSString *filename = [self cachedFileNameForKey:key];
-    return [path stringByAppendingPathComponent:filename];
-}
-
-- (nullable NSString *)defaultCachePathForKey:(nullable NSString *)key {
-    return [self cachePathForKey:key inPath:self.diskCachePath];
-}
-
-- (nullable NSString *)cachedFileNameForKey:(nullable NSString *)key {
-    const char *str = key.UTF8String;
-    if (str == NULL) {
-        str = "";
-    }
-    unsigned char r[CC_MD5_DIGEST_LENGTH];
-    CC_MD5(str, (CC_LONG)strlen(str), r);
-    NSURL *keyURL = [NSURL URLWithString:key];
-    NSString *ext = keyURL ? keyURL.pathExtension : key.pathExtension;
-    NSString *filename = [NSString stringWithFormat:@"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%@",
-                          r[0], r[1], r[2], r[3], r[4], r[5], r[6], r[7], r[8], r[9], r[10],
-                          r[11], r[12], r[13], r[14], r[15], ext.length == 0 ? @"" : [NSString stringWithFormat:@".%@", ext]];
-    return filename;
-}
-
-- (nullable NSString *)makeDiskCachePath:(nonnull NSString*)fullNamespace {
-    NSArray<NSString *> *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
-    return [paths[0] stringByAppendingPathComponent:fullNamespace];
-}
-
-#pragma mark - Store Ops
-
-- (void)storeImage:(nullable UIImage *)image
-            forKey:(nullable NSString *)key
-        completion:(nullable SDWebImageNoParamsBlock)completionBlock {
-    [self storeImage:image imageData:nil forKey:key toDisk:YES completion:completionBlock];
-}
-
-- (void)storeImage:(nullable UIImage *)image
-            forKey:(nullable NSString *)key
-            toDisk:(BOOL)toDisk
-        completion:(nullable SDWebImageNoParamsBlock)completionBlock {
-    [self storeImage:image imageData:nil forKey:key toDisk:toDisk completion:completionBlock];
-}
-
-- (void)storeImage:(nullable UIImage *)image
-         imageData:(nullable NSData *)imageData
-            forKey:(nullable NSString *)key
-            toDisk:(BOOL)toDisk
-        completion:(nullable SDWebImageNoParamsBlock)completionBlock {
-    if (!image || !key) {
-        if (completionBlock) {
-            completionBlock();
-        }
-        return;
-    }
-    // if memory cache is enabled
-    if (self.config.shouldCacheImagesInMemory) {
-        NSUInteger cost = SDCacheCostForImage(image);
-        [self.memCache setObject:image forKey:key cost:cost];
-    }
-    
-    if (toDisk) {
-        dispatch_async(self.ioQueue, ^{
-            @autoreleasepool {
-                NSData *data = imageData;
-                if (!data && image) {
-                    // If we do not have any data to detect image format, check whether it contains alpha channel to use PNG or JPEG format
-                    SDImageFormat format;
-                    if (SDCGImageRefContainsAlpha(image.CGImage)) {
-                        format = SDImageFormatPNG;
-                    } else {
-                        format = SDImageFormatJPEG;
-                    }
-                    data = [[SDWebImageCodersManager sharedInstance] encodedDataWithImage:image format:format];
-                }
-                [self _storeImageDataToDisk:data forKey:key];
-            }
-            
-            if (completionBlock) {
-                dispatch_async(dispatch_get_main_queue(), ^{
-                    completionBlock();
-                });
-            }
-        });
-    } else {
-        if (completionBlock) {
-            completionBlock();
-        }
-    }
-}
-
-- (void)storeImageDataToDisk:(nullable NSData *)imageData forKey:(nullable NSString *)key {
-    if (!imageData || !key) {
-        return;
-    }
-    dispatch_sync(self.ioQueue, ^{
-        [self _storeImageDataToDisk:imageData forKey:key];
-    });
-}
-
-// Make sure to call form io queue by caller
-- (void)_storeImageDataToDisk:(nullable NSData *)imageData forKey:(nullable NSString *)key {
-    if (!imageData || !key) {
-        return;
-    }
-    
-    if (![self.fileManager fileExistsAtPath:_diskCachePath]) {
-        [self.fileManager createDirectoryAtPath:_diskCachePath withIntermediateDirectories:YES attributes:nil error:NULL];
-    }
-    
-    // get cache Path for image key
-    NSString *cachePathForKey = [self defaultCachePathForKey:key];
-    // transform to NSUrl
-    NSURL *fileURL = [NSURL fileURLWithPath:cachePathForKey];
-    
-    [imageData writeToURL:fileURL options:self.config.diskCacheWritingOptions error:nil];
-    
-    // disable iCloud backup
-    if (self.config.shouldDisableiCloud) {
-        [fileURL setResourceValue:@YES forKey:NSURLIsExcludedFromBackupKey error:nil];
-    }
-}
-
-#pragma mark - Query and Retrieve Ops
-
-- (void)diskImageExistsWithKey:(nullable NSString *)key completion:(nullable SDWebImageCheckCacheCompletionBlock)completionBlock {
-    dispatch_async(self.ioQueue, ^{
-        BOOL exists = [self _diskImageDataExistsWithKey:key];
-        if (completionBlock) {
-            dispatch_async(dispatch_get_main_queue(), ^{
-                completionBlock(exists);
-            });
-        }
-    });
-}
-
-- (BOOL)diskImageDataExistsWithKey:(nullable NSString *)key {
-    if (!key) {
-        return NO;
-    }
-    __block BOOL exists = NO;
-    dispatch_sync(self.ioQueue, ^{
-        exists = [self _diskImageDataExistsWithKey:key];
-    });
-    
-    return exists;
-}
-
-// Make sure to call form io queue by caller
-- (BOOL)_diskImageDataExistsWithKey:(nullable NSString *)key {
-    if (!key) {
-        return NO;
-    }
-    BOOL exists = [self.fileManager fileExistsAtPath:[self defaultCachePathForKey:key]];
-    
-    // fallback because of https://github.com/rs/SDWebImage/pull/976 that added the extension to the disk file name
-    // checking the key with and without the extension
-    if (!exists) {
-        exists = [self.fileManager fileExistsAtPath:[self defaultCachePathForKey:key].stringByDeletingPathExtension];
-    }
-    
-    return exists;
-}
-
-- (nullable NSData *)diskImageDataForKey:(nullable NSString *)key {
-    if (!key) {
-        return nil;
-    }
-    __block NSData *imageData = nil;
-    dispatch_sync(self.ioQueue, ^{
-        imageData = [self diskImageDataBySearchingAllPathsForKey:key];
-    });
-    
-    return imageData;
-}
-
-- (nullable UIImage *)imageFromMemoryCacheForKey:(nullable NSString *)key {
-    return [self.memCache objectForKey:key];
-}
-
-- (nullable UIImage *)imageFromDiskCacheForKey:(nullable NSString *)key {
-    UIImage *diskImage = [self diskImageForKey:key];
-    if (diskImage && self.config.shouldCacheImagesInMemory) {
-        NSUInteger cost = SDCacheCostForImage(diskImage);
-        [self.memCache setObject:diskImage forKey:key cost:cost];
-    }
-
-    return diskImage;
-}
-
-- (nullable UIImage *)imageFromCacheForKey:(nullable NSString *)key {
-    // First check the in-memory cache...
-    UIImage *image = [self imageFromMemoryCacheForKey:key];
-    if (image) {
-        return image;
-    }
-    
-    // Second check the disk cache...
-    image = [self imageFromDiskCacheForKey:key];
-    return image;
-}
-
-- (nullable NSData *)diskImageDataBySearchingAllPathsForKey:(nullable NSString *)key {
-    NSString *defaultPath = [self defaultCachePathForKey:key];
-    NSData *data = [NSData dataWithContentsOfFile:defaultPath options:self.config.diskCacheReadingOptions error:nil];
-    if (data) {
-        return data;
-    }
-
-    // fallback because of https://github.com/rs/SDWebImage/pull/976 that added the extension to the disk file name
-    // checking the key with and without the extension
-    data = [NSData dataWithContentsOfFile:defaultPath.stringByDeletingPathExtension options:self.config.diskCacheReadingOptions error:nil];
-    if (data) {
-        return data;
-    }
-
-    NSArray<NSString *> *customPaths = [self.customPaths copy];
-    for (NSString *path in customPaths) {
-        NSString *filePath = [self cachePathForKey:key inPath:path];
-        NSData *imageData = [NSData dataWithContentsOfFile:filePath options:self.config.diskCacheReadingOptions error:nil];
-        if (imageData) {
-            return imageData;
-        }
-
-        // fallback because of https://github.com/rs/SDWebImage/pull/976 that added the extension to the disk file name
-        // checking the key with and without the extension
-        imageData = [NSData dataWithContentsOfFile:filePath.stringByDeletingPathExtension options:self.config.diskCacheReadingOptions error:nil];
-        if (imageData) {
-            return imageData;
-        }
-    }
-
-    return nil;
-}
-
-- (nullable UIImage *)diskImageForKey:(nullable NSString *)key {
-    NSData *data = [self diskImageDataForKey:key];
-    return [self diskImageForKey:key data:data];
-}
-
-- (nullable UIImage *)diskImageForKey:(nullable NSString *)key data:(nullable NSData *)data {
-    return [self diskImageForKey:key data:data options:0];
-}
-
-- (nullable UIImage *)diskImageForKey:(nullable NSString *)key data:(nullable NSData *)data options:(SDImageCacheOptions)options {
-    if (data) {
-        UIImage *image = [[SDWebImageCodersManager sharedInstance] decodedImageWithData:data];
-        image = [self scaledImageForKey:key image:image];
-        if (self.config.shouldDecompressImages) {
-            BOOL shouldScaleDown = options & SDImageCacheScaleDownLargeImages;
-            image = [[SDWebImageCodersManager sharedInstance] decompressedImageWithImage:image data:&data options:@{SDWebImageCoderScaleDownLargeImagesKey: @(shouldScaleDown)}];
-        }
-        return image;
-    } else {
-        return nil;
-    }
-}
-
-- (nullable UIImage *)scaledImageForKey:(nullable NSString *)key image:(nullable UIImage *)image {
-    return SDScaledImageForKey(key, image);
-}
-
-- (NSOperation *)queryCacheOperationForKey:(NSString *)key done:(SDCacheQueryCompletedBlock)doneBlock {
-    return [self queryCacheOperationForKey:key options:0 done:doneBlock];
-}
-
-- (nullable NSOperation *)queryCacheOperationForKey:(nullable NSString *)key options:(SDImageCacheOptions)options done:(nullable SDCacheQueryCompletedBlock)doneBlock {
-    if (!key) {
-        if (doneBlock) {
-            doneBlock(nil, nil, SDImageCacheTypeNone);
-        }
-        return nil;
-    }
-    
-    // First check the in-memory cache...
-    UIImage *image = [self imageFromMemoryCacheForKey:key];
-    BOOL shouldQueryMemoryOnly = (image && !(options & SDImageCacheQueryDataWhenInMemory));
-    if (shouldQueryMemoryOnly) {
-        if (doneBlock) {
-            doneBlock(image, nil, SDImageCacheTypeMemory);
-        }
-        return nil;
-    }
-    
-    NSOperation *operation = [NSOperation new];
-    void(^queryDiskBlock)(void) =  ^{
-        if (operation.isCancelled) {
-            // do not call the completion if cancelled
-            return;
-        }
-        
-        @autoreleasepool {
-            NSData *diskData = [self diskImageDataBySearchingAllPathsForKey:key];
-            UIImage *diskImage;
-            SDImageCacheType cacheType = SDImageCacheTypeDisk;
-            if (image) {
-                // the image is from in-memory cache
-                diskImage = image;
-                cacheType = SDImageCacheTypeMemory;
-            } else if (diskData) {
-                // decode image data only if in-memory cache missed
-                diskImage = [self diskImageForKey:key data:diskData options:options];
-                if (diskImage && self.config.shouldCacheImagesInMemory) {
-                    NSUInteger cost = SDCacheCostForImage(diskImage);
-                    [self.memCache setObject:diskImage forKey:key cost:cost];
-                }
-            }
-            
-            if (doneBlock) {
-                if (options & SDImageCacheQueryDiskSync) {
-                    doneBlock(diskImage, diskData, cacheType);
-                } else {
-                    dispatch_async(dispatch_get_main_queue(), ^{
-                        doneBlock(diskImage, diskData, cacheType);
-                    });
-                }
-            }
-        }
-    };
-    
-    if (options & SDImageCacheQueryDiskSync) {
-        queryDiskBlock();
-    } else {
-        dispatch_async(self.ioQueue, queryDiskBlock);
-    }
-    
-    return operation;
-}
-
-#pragma mark - Remove Ops
-
-- (void)removeImageForKey:(nullable NSString *)key withCompletion:(nullable SDWebImageNoParamsBlock)completion {
-    [self removeImageForKey:key fromDisk:YES withCompletion:completion];
-}
-
-- (void)removeImageForKey:(nullable NSString *)key fromDisk:(BOOL)fromDisk withCompletion:(nullable SDWebImageNoParamsBlock)completion {
-    if (key == nil) {
-        return;
-    }
-
-    if (self.config.shouldCacheImagesInMemory) {
-        [self.memCache removeObjectForKey:key];
-    }
-
-    if (fromDisk) {
-        dispatch_async(self.ioQueue, ^{
-            [self.fileManager removeItemAtPath:[self defaultCachePathForKey:key] error:nil];
-            
-            if (completion) {
-                dispatch_async(dispatch_get_main_queue(), ^{
-                    completion();
-                });
-            }
-        });
-    } else if (completion){
-        completion();
-    }
-    
-}
-
-# pragma mark - Mem Cache settings
-
-- (void)setMaxMemoryCost:(NSUInteger)maxMemoryCost {
-    self.memCache.totalCostLimit = maxMemoryCost;
-}
-
-- (NSUInteger)maxMemoryCost {
-    return self.memCache.totalCostLimit;
-}
-
-- (NSUInteger)maxMemoryCountLimit {
-    return self.memCache.countLimit;
-}
-
-- (void)setMaxMemoryCountLimit:(NSUInteger)maxCountLimit {
-    self.memCache.countLimit = maxCountLimit;
-}
-
-#pragma mark - Cache clean Ops
-
-- (void)clearMemory {
-    [self.memCache removeAllObjects];
-}
-
-- (void)clearDiskOnCompletion:(nullable SDWebImageNoParamsBlock)completion {
-    dispatch_async(self.ioQueue, ^{
-        [self.fileManager removeItemAtPath:self.diskCachePath error:nil];
-        [self.fileManager createDirectoryAtPath:self.diskCachePath
-                withIntermediateDirectories:YES
-                                 attributes:nil
-                                      error:NULL];
-
-        if (completion) {
-            dispatch_async(dispatch_get_main_queue(), ^{
-                completion();
-            });
-        }
-    });
-}
-
-- (void)deleteOldFiles {
-    [self deleteOldFilesWithCompletionBlock:nil];
-}
-
-- (void)deleteOldFilesWithCompletionBlock:(nullable SDWebImageNoParamsBlock)completionBlock {
-    dispatch_async(self.ioQueue, ^{
-        NSURL *diskCacheURL = [NSURL fileURLWithPath:self.diskCachePath isDirectory:YES];
-
-        // Compute content date key to be used for tests
-        NSURLResourceKey cacheContentDateKey = NSURLContentModificationDateKey;
-        switch (self.config.diskCacheExpireType) {
-            case SDImageCacheConfigExpireTypeAccessDate:
-                cacheContentDateKey = NSURLContentAccessDateKey;
-                break;
-
-            case SDImageCacheConfigExpireTypeModificationDate:
-                cacheContentDateKey = NSURLContentModificationDateKey;
-                break;
-
-            default:
-                break;
-        }
-        
-        NSArray<NSString *> *resourceKeys = @[NSURLIsDirectoryKey, cacheContentDateKey, NSURLTotalFileAllocatedSizeKey];
-
-        // This enumerator prefetches useful properties for our cache files.
-        NSDirectoryEnumerator *fileEnumerator = [self.fileManager enumeratorAtURL:diskCacheURL
-                                                   includingPropertiesForKeys:resourceKeys
-                                                                      options:NSDirectoryEnumerationSkipsHiddenFiles
-                                                                 errorHandler:NULL];
-
-        NSDate *expirationDate = [NSDate dateWithTimeIntervalSinceNow:-self.config.maxCacheAge];
-        NSMutableDictionary<NSURL *, NSDictionary<NSString *, id> *> *cacheFiles = [NSMutableDictionary dictionary];
-        NSUInteger currentCacheSize = 0;
-
-        // Enumerate all of the files in the cache directory.  This loop has two purposes:
-        //
-        //  1. Removing files that are older than the expiration date.
-        //  2. Storing file attributes for the size-based cleanup pass.
-        NSMutableArray<NSURL *> *urlsToDelete = [[NSMutableArray alloc] init];
-        for (NSURL *fileURL in fileEnumerator) {
-            NSError *error;
-            NSDictionary<NSString *, id> *resourceValues = [fileURL resourceValuesForKeys:resourceKeys error:&error];
-
-            // Skip directories and errors.
-            if (error || !resourceValues || [resourceValues[NSURLIsDirectoryKey] boolValue]) {
-                continue;
-            }
-
-            // Remove files that are older than the expiration date;
-            NSDate *modifiedDate = resourceValues[cacheContentDateKey];
-            if ([[modifiedDate laterDate:expirationDate] isEqualToDate:expirationDate]) {
-                [urlsToDelete addObject:fileURL];
-                continue;
-            }
-            
-            // Store a reference to this file and account for its total size.
-            NSNumber *totalAllocatedSize = resourceValues[NSURLTotalFileAllocatedSizeKey];
-            currentCacheSize += totalAllocatedSize.unsignedIntegerValue;
-            cacheFiles[fileURL] = resourceValues;
-        }
-        
-        for (NSURL *fileURL in urlsToDelete) {
-            [self.fileManager removeItemAtURL:fileURL error:nil];
-        }
-
-        // If our remaining disk cache exceeds a configured maximum size, perform a second
-        // size-based cleanup pass.  We delete the oldest files first.
-        if (self.config.maxCacheSize > 0 && currentCacheSize > self.config.maxCacheSize) {
-            // Target half of our maximum cache size for this cleanup pass.
-            const NSUInteger desiredCacheSize = self.config.maxCacheSize / 2;
-
-            // Sort the remaining cache files by their last modification time (oldest first).
-            NSArray<NSURL *> *sortedFiles = [cacheFiles keysSortedByValueWithOptions:NSSortConcurrent
-                                                                     usingComparator:^NSComparisonResult(id obj1, id obj2) {
-                                                                         return [obj1[NSURLContentModificationDateKey] compare:obj2[NSURLContentModificationDateKey]];
-                                                                     }];
-
-            // Delete files until we fall below our desired cache size.
-            for (NSURL *fileURL in sortedFiles) {
-                if ([self.fileManager removeItemAtURL:fileURL error:nil]) {
-                    NSDictionary<NSString *, id> *resourceValues = cacheFiles[fileURL];
-                    NSNumber *totalAllocatedSize = resourceValues[NSURLTotalFileAllocatedSizeKey];
-                    currentCacheSize -= totalAllocatedSize.unsignedIntegerValue;
-
-                    if (currentCacheSize < desiredCacheSize) {
-                        break;
-                    }
-                }
-            }
-        }
-        if (completionBlock) {
-            dispatch_async(dispatch_get_main_queue(), ^{
-                completionBlock();
-            });
-        }
-    });
-}
-
-#if SD_UIKIT
-- (void)backgroundDeleteOldFiles {
-    Class UIApplicationClass = NSClassFromString(@"UIApplication");
-    if(!UIApplicationClass || ![UIApplicationClass respondsToSelector:@selector(sharedApplication)]) {
-        return;
-    }
-    UIApplication *application = [UIApplication performSelector:@selector(sharedApplication)];
-    __block UIBackgroundTaskIdentifier bgTask = [application beginBackgroundTaskWithExpirationHandler:^{
-        // Clean up any unfinished task business by marking where you
-        // stopped or ending the task outright.
-        [application endBackgroundTask:bgTask];
-        bgTask = UIBackgroundTaskInvalid;
-    }];
-
-    // Start the long-running task and return immediately.
-    [self deleteOldFilesWithCompletionBlock:^{
-        [application endBackgroundTask:bgTask];
-        bgTask = UIBackgroundTaskInvalid;
-    }];
-}
-#endif
-
-#pragma mark - Cache Info
-
-- (NSUInteger)getSize {
-    __block NSUInteger size = 0;
-    dispatch_sync(self.ioQueue, ^{
-        NSDirectoryEnumerator *fileEnumerator = [self.fileManager enumeratorAtPath:self.diskCachePath];
-        for (NSString *fileName in fileEnumerator) {
-            NSString *filePath = [self.diskCachePath stringByAppendingPathComponent:fileName];
-            NSDictionary<NSString *, id> *attrs = [self.fileManager attributesOfItemAtPath:filePath error:nil];
-            size += [attrs fileSize];
-        }
-    });
-    return size;
-}
-
-- (NSUInteger)getDiskCount {
-    __block NSUInteger count = 0;
-    dispatch_sync(self.ioQueue, ^{
-        NSDirectoryEnumerator *fileEnumerator = [self.fileManager enumeratorAtPath:self.diskCachePath];
-        count = fileEnumerator.allObjects.count;
-    });
-    return count;
-}
-
-- (void)calculateSizeWithCompletionBlock:(nullable SDWebImageCalculateSizeBlock)completionBlock {
-    NSURL *diskCacheURL = [NSURL fileURLWithPath:self.diskCachePath isDirectory:YES];
-
-    dispatch_async(self.ioQueue, ^{
-        NSUInteger fileCount = 0;
-        NSUInteger totalSize = 0;
-
-        NSDirectoryEnumerator *fileEnumerator = [self.fileManager enumeratorAtURL:diskCacheURL
-                                                   includingPropertiesForKeys:@[NSFileSize]
-                                                                      options:NSDirectoryEnumerationSkipsHiddenFiles
-                                                                 errorHandler:NULL];
-
-        for (NSURL *fileURL in fileEnumerator) {
-            NSNumber *fileSize;
-            [fileURL getResourceValue:&fileSize forKey:NSURLFileSizeKey error:NULL];
-            totalSize += fileSize.unsignedIntegerValue;
-            fileCount += 1;
-        }
-
-        if (completionBlock) {
-            dispatch_async(dispatch_get_main_queue(), ^{
-                completionBlock(fileCount, totalSize);
-            });
-        }
-    });
-}
-
-@end
-
diff --git a/SDWebImage/SDImageCacheConfig.h b/SDWebImage/SDImageCacheConfig.h
deleted file mode 100644
index c0de68883..000000000
--- a/SDWebImage/SDImageCacheConfig.h
+++ /dev/null
@@ -1,79 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import <Foundation/Foundation.h>
-#import "SDWebImageCompat.h"
-
-typedef NS_ENUM(NSUInteger, SDImageCacheConfigExpireType) {
-    /**
-     * When the image is accessed it will update this value
-     */
-    SDImageCacheConfigExpireTypeAccessDate,
-    /**
-     * The image was obtained from the disk cache (Default)
-     */
-    SDImageCacheConfigExpireTypeModificationDate
-};
-
-@interface SDImageCacheConfig : NSObject
-
-/**
- * Decompressing images that are downloaded and cached can improve performance but can consume lot of memory.
- * Defaults to YES. Set this to NO if you are experiencing a crash due to excessive memory consumption.
- */
-@property (assign, nonatomic) BOOL shouldDecompressImages;
-
-/**
- * Whether or not to disable iCloud backup
- * Defaults to YES.
- */
-@property (assign, nonatomic) BOOL shouldDisableiCloud;
-
-/**
- * Whether or not to use memory cache
- * @note When the memory cache is disabled, the weak memory cache will also be disabled.
- * Defaults to YES.
- */
-@property (assign, nonatomic) BOOL shouldCacheImagesInMemory;
-
-/**
- * The option to control weak memory cache for images. When enable, `SDImageCache`'s memory cache will use a weak maptable to store the image at the same time when it stored to memory, and get removed at the same time.
- * However when memory warning is triggered, since the weak maptable does not hold a strong reference to image instacnce, even when the memory cache itself is purged, some images which are held strongly by UIImageViews or other live instances can be recovered again, to avoid later re-query from disk cache or network. This may be helpful for the case, for example, when app enter background and memory is purged, cause cell flashing after re-enter foreground.
- * Defautls to YES. You can change this option dynamically.
- */
-@property (assign, nonatomic) BOOL shouldUseWeakMemoryCache;
-
-/**
- * The reading options while reading cache from disk.
- * Defaults to 0. You can set this to `NSDataReadingMappedIfSafe` to improve performance.
- */
-@property (assign, nonatomic) NSDataReadingOptions diskCacheReadingOptions;
-
-/**
- * The writing options while writing cache to disk.
- * Defaults to `NSDataWritingAtomic`. You can set this to `NSDataWritingWithoutOverwriting` to prevent overwriting an existing file.
- */
-@property (assign, nonatomic) NSDataWritingOptions diskCacheWritingOptions;
-
-/**
- * The maximum length of time to keep an image in the cache, in seconds.
- */
-@property (assign, nonatomic) NSInteger maxCacheAge;
-
-/**
- * The maximum size of the cache, in bytes.
- */
-@property (assign, nonatomic) NSUInteger maxCacheSize;
-
-/**
- * The attribute which the clear cache will be checked against when clearing the disk cache
- * Default is Modified Date
- */
-@property (assign, nonatomic) SDImageCacheConfigExpireType diskCacheExpireType;
-
-@end
diff --git a/SDWebImage/SDImageCacheConfig.m b/SDWebImage/SDImageCacheConfig.m
deleted file mode 100644
index d4f4dd216..000000000
--- a/SDWebImage/SDImageCacheConfig.m
+++ /dev/null
@@ -1,30 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "SDImageCacheConfig.h"
-
-static const NSInteger kDefaultCacheMaxCacheAge = 60 * 60 * 24 * 7; // 1 week
-
-@implementation SDImageCacheConfig
-
-- (instancetype)init {
-    if (self = [super init]) {
-        _shouldDecompressImages = YES;
-        _shouldDisableiCloud = YES;
-        _shouldCacheImagesInMemory = YES;
-        _shouldUseWeakMemoryCache = YES;
-        _diskCacheReadingOptions = 0;
-        _diskCacheWritingOptions = NSDataWritingAtomic;
-        _maxCacheAge = kDefaultCacheMaxCacheAge;
-        _maxCacheSize = 0;
-        _diskCacheExpireType = SDImageCacheConfigExpireTypeModificationDate;
-    }
-    return self;
-}
-
-@end
diff --git a/SDWebImage/SDWebImageCoder.h b/SDWebImage/SDWebImageCoder.h
deleted file mode 100644
index 7c0a63f28..000000000
--- a/SDWebImage/SDWebImageCoder.h
+++ /dev/null
@@ -1,119 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import <Foundation/Foundation.h>
-#import "SDWebImageCompat.h"
-#import "NSData+ImageContentType.h"
-
-/**
- A Boolean value indicating whether to scale down large images during decompressing. (NSNumber)
- */
-FOUNDATION_EXPORT NSString * _Nonnull const SDWebImageCoderScaleDownLargeImagesKey;
-
-/**
- Return the shared device-dependent RGB color space created with CGColorSpaceCreateDeviceRGB.
-
- @return The device-dependent RGB color space
- */
-CG_EXTERN CGColorSpaceRef _Nonnull SDCGColorSpaceGetDeviceRGB(void);
-
-/**
- Check whether CGImageRef contains alpha channel.
-
- @param imageRef The CGImageRef
- @return Return YES if CGImageRef contains alpha channel, otherwise return NO
- */
-CG_EXTERN BOOL SDCGImageRefContainsAlpha(_Nullable CGImageRef imageRef);
-
-
-/**
- This is the image coder protocol to provide custom image decoding/encoding.
- These methods are all required to implement.
- @note Pay attention that these methods are not called from main queue.
- */
-@protocol SDWebImageCoder <NSObject>
-
-@required
-#pragma mark - Decoding
-/**
- Returns YES if this coder can decode some data. Otherwise, the data should be passed to another coder.
- 
- @param data The image data so we can look at it
- @return YES if this coder can decode the data, NO otherwise
- */
-- (BOOL)canDecodeFromData:(nullable NSData *)data;
-
-/**
- Decode the image data to image.
-
- @param data The image data to be decoded
- @return The decoded image from data
- */
-- (nullable UIImage *)decodedImageWithData:(nullable NSData *)data;
-
-/**
- Decompress the image with original image and image data.
-
- @param image The original image to be decompressed
- @param data The pointer to original image data. The pointer itself is nonnull but image data can be null. This data will set to cache if needed. If you do not need to modify data at the sametime, ignore this param.
- @param optionsDict A dictionary containing any decompressing options. Pass {SDWebImageCoderScaleDownLargeImagesKey: @(YES)} to scale down large images
- @return The decompressed image
- */
-- (nullable UIImage *)decompressedImageWithImage:(nullable UIImage *)image
-                                            data:(NSData * _Nullable * _Nonnull)data
-                                         options:(nullable NSDictionary<NSString*, NSObject*>*)optionsDict;
-
-#pragma mark - Encoding
-
-/**
- Returns YES if this coder can encode some image. Otherwise, it should be passed to another coder.
- 
- @param format The image format
- @return YES if this coder can encode the image, NO otherwise
- */
-- (BOOL)canEncodeToFormat:(SDImageFormat)format;
-
-/**
- Encode the image to image data.
-
- @param image The image to be encoded
- @param format The image format to encode, you should note `SDImageFormatUndefined` format is also  possible
- @return The encoded image data
- */
-- (nullable NSData *)encodedDataWithImage:(nullable UIImage *)image format:(SDImageFormat)format;
-
-@end
-
-
-/**
- This is the image coder protocol to provide custom progressive image decoding.
- These methods are all required to implement.
- @note Pay attention that these methods are not called from main queue.
- */
-@protocol SDWebImageProgressiveCoder <SDWebImageCoder>
-
-@required
-/**
- Returns YES if this coder can incremental decode some data. Otherwise, it should be passed to another coder.
- 
- @param data The image data so we can look at it
- @return YES if this coder can decode the data, NO otherwise
- */
-- (BOOL)canIncrementallyDecodeFromData:(nullable NSData *)data;
-
-/**
- Incremental decode the image data to image.
- 
- @param data The image data has been downloaded so far
- @param finished Whether the download has finished
- @warning because incremental decoding need to keep the decoded context, we will alloc a new instance with the same class for each download operation to avoid conflicts
- @return The decoded image from data
- */
-- (nullable UIImage *)incrementallyDecodedImageWithData:(nullable NSData *)data finished:(BOOL)finished;
-
-@end
diff --git a/SDWebImage/SDWebImageCoder.m b/SDWebImage/SDWebImageCoder.m
deleted file mode 100644
index 9357fe521..000000000
--- a/SDWebImage/SDWebImageCoder.m
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "SDWebImageCoder.h"
-
-NSString * const SDWebImageCoderScaleDownLargeImagesKey = @"scaleDownLargeImages";
-
-CGColorSpaceRef SDCGColorSpaceGetDeviceRGB(void) {
-    static CGColorSpaceRef colorSpace;
-    static dispatch_once_t onceToken;
-    dispatch_once(&onceToken, ^{
-        colorSpace = CGColorSpaceCreateDeviceRGB();
-    });
-    return colorSpace;
-}
-
-BOOL SDCGImageRefContainsAlpha(CGImageRef imageRef) {
-    if (!imageRef) {
-        return NO;
-    }
-    CGImageAlphaInfo alphaInfo = CGImageGetAlphaInfo(imageRef);
-    BOOL hasAlpha = !(alphaInfo == kCGImageAlphaNone ||
-                      alphaInfo == kCGImageAlphaNoneSkipFirst ||
-                      alphaInfo == kCGImageAlphaNoneSkipLast);
-    return hasAlpha;
-}
diff --git a/SDWebImage/SDWebImageCoderHelper.h b/SDWebImage/SDWebImageCoderHelper.h
deleted file mode 100644
index ad2fe8556..000000000
--- a/SDWebImage/SDWebImageCoderHelper.h
+++ /dev/null
@@ -1,52 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import <Foundation/Foundation.h>
-#import "SDWebImageCompat.h"
-#import "SDWebImageFrame.h"
-
-@interface SDWebImageCoderHelper : NSObject
-
-/**
- Return an animated image with frames array.
- For UIKit, this will apply the patch and then create animated UIImage. The patch is because that `+[UIImage animatedImageWithImages:duration:]` just use the average of duration for each image. So it will not work if different frame has different duration. Therefore we repeat the specify frame for specify times to let it work.
- For AppKit, NSImage does not support animates other than GIF. This will try to encode the frames to GIF format and then create an animated NSImage for rendering. Attention the animated image may loss some detail if the input frames contain full alpha channel because GIF only supports 1 bit alpha channel. (For 1 pixel, either transparent or not)
-
- @param frames The frames array. If no frames or frames is empty, return nil
- @return A animated image for rendering on UIImageView(UIKit) or NSImageView(AppKit)
- */
-+ (UIImage * _Nullable)animatedImageWithFrames:(NSArray<SDWebImageFrame *> * _Nullable)frames;
-
-/**
- Return frames array from an animated image.
- For UIKit, this will unapply the patch for the description above and then create frames array. This will also work for normal animated UIImage.
- For AppKit, NSImage does not support animates other than GIF. This will try to decode the GIF imageRep and then create frames array.
-
- @param animatedImage A animated image. If it's not animated, return nil
- @return The frames array
- */
-+ (NSArray<SDWebImageFrame *> * _Nullable)framesFromAnimatedImage:(UIImage * _Nullable)animatedImage;
-
-#if SD_UIKIT || SD_WATCH
-/**
- Convert an EXIF image orientation to an iOS one.
-
- @param exifOrientation EXIF orientation
- @return iOS orientation
- */
-+ (UIImageOrientation)imageOrientationFromEXIFOrientation:(NSInteger)exifOrientation;
-/**
- Convert an iOS orientation to an EXIF image orientation.
-
- @param imageOrientation iOS orientation
- @return EXIF orientation
- */
-+ (NSInteger)exifOrientationFromImageOrientation:(UIImageOrientation)imageOrientation;
-#endif
-
-@end
diff --git a/SDWebImage/SDWebImageCoderHelper.m b/SDWebImage/SDWebImageCoderHelper.m
deleted file mode 100644
index ea1dae189..000000000
--- a/SDWebImage/SDWebImageCoderHelper.m
+++ /dev/null
@@ -1,258 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "SDWebImageCoderHelper.h"
-#import "SDWebImageFrame.h"
-#import "UIImage+MultiFormat.h"
-#import "NSImage+WebCache.h"
-#import <ImageIO/ImageIO.h>
-#import "SDAnimatedImageRep.h"
-
-@implementation SDWebImageCoderHelper
-
-+ (UIImage *)animatedImageWithFrames:(NSArray<SDWebImageFrame *> *)frames {
-    NSUInteger frameCount = frames.count;
-    if (frameCount == 0) {
-        return nil;
-    }
-    
-    UIImage *animatedImage;
-    
-#if SD_UIKIT || SD_WATCH
-    NSUInteger durations[frameCount];
-    for (size_t i = 0; i < frameCount; i++) {
-        durations[i] = frames[i].duration * 1000;
-    }
-    NSUInteger const gcd = gcdArray(frameCount, durations);
-    __block NSUInteger totalDuration = 0;
-    NSMutableArray<UIImage *> *animatedImages = [NSMutableArray arrayWithCapacity:frameCount];
-    [frames enumerateObjectsUsingBlock:^(SDWebImageFrame * _Nonnull frame, NSUInteger idx, BOOL * _Nonnull stop) {
-        UIImage *image = frame.image;
-        NSUInteger duration = frame.duration * 1000;
-        totalDuration += duration;
-        NSUInteger repeatCount;
-        if (gcd) {
-            repeatCount = duration / gcd;
-        } else {
-            repeatCount = 1;
-        }
-        for (size_t i = 0; i < repeatCount; ++i) {
-            [animatedImages addObject:image];
-        }
-    }];
-    
-    animatedImage = [UIImage animatedImageWithImages:animatedImages duration:totalDuration / 1000.f];
-    
-#else
-    
-    NSMutableData *imageData = [NSMutableData data];
-    CFStringRef imageUTType = [NSData sd_UTTypeFromSDImageFormat:SDImageFormatGIF];
-    // Create an image destination. GIF does not support EXIF image orientation
-    CGImageDestinationRef imageDestination = CGImageDestinationCreateWithData((__bridge CFMutableDataRef)imageData, imageUTType, frameCount, NULL);
-    if (!imageDestination) {
-        // Handle failure.
-        return nil;
-    }
-    
-    for (size_t i = 0; i < frameCount; i++) {
-        @autoreleasepool {
-            SDWebImageFrame *frame = frames[i];
-            float frameDuration = frame.duration;
-            CGImageRef frameImageRef = frame.image.CGImage;
-            NSDictionary *frameProperties = @{(__bridge NSString *)kCGImagePropertyGIFDictionary : @{(__bridge NSString *)kCGImagePropertyGIFDelayTime : @(frameDuration)}};
-            CGImageDestinationAddImage(imageDestination, frameImageRef, (__bridge CFDictionaryRef)frameProperties);
-        }
-    }
-    // Finalize the destination.
-    if (CGImageDestinationFinalize(imageDestination) == NO) {
-        // Handle failure.
-        CFRelease(imageDestination);
-        return nil;
-    }
-    CFRelease(imageDestination);
-    SDAnimatedImageRep *imageRep = [[SDAnimatedImageRep alloc] initWithData:imageData];
-    animatedImage = [[NSImage alloc] initWithSize:imageRep.size];
-    [animatedImage addRepresentation:imageRep];
-#endif
-    
-    return animatedImage;
-}
-
-+ (NSArray<SDWebImageFrame *> *)framesFromAnimatedImage:(UIImage *)animatedImage {
-    if (!animatedImage) {
-        return nil;
-    }
-    
-    NSMutableArray<SDWebImageFrame *> *frames = [NSMutableArray array];
-    NSUInteger frameCount = 0;
-    
-#if SD_UIKIT || SD_WATCH
-    NSArray<UIImage *> *animatedImages = animatedImage.images;
-    frameCount = animatedImages.count;
-    if (frameCount == 0) {
-        return nil;
-    }
-    
-    NSTimeInterval avgDuration = animatedImage.duration / frameCount;
-    if (avgDuration == 0) {
-        avgDuration = 0.1; // if it's a animated image but no duration, set it to default 100ms (this do not have that 10ms limit like GIF or WebP to allow custom coder provide the limit)
-    }
-    
-    __block NSUInteger index = 0;
-    __block NSUInteger repeatCount = 1;
-    __block UIImage *previousImage = animatedImages.firstObject;
-    [animatedImages enumerateObjectsUsingBlock:^(UIImage * _Nonnull image, NSUInteger idx, BOOL * _Nonnull stop) {
-        // ignore first
-        if (idx == 0) {
-            return;
-        }
-        if ([image isEqual:previousImage]) {
-            repeatCount++;
-        } else {
-            SDWebImageFrame *frame = [SDWebImageFrame frameWithImage:previousImage duration:avgDuration * repeatCount];
-            [frames addObject:frame];
-            repeatCount = 1;
-            index++;
-        }
-        previousImage = image;
-        // last one
-        if (idx == frameCount - 1) {
-            SDWebImageFrame *frame = [SDWebImageFrame frameWithImage:previousImage duration:avgDuration * repeatCount];
-            [frames addObject:frame];
-        }
-    }];
-    
-#else
-    
-    NSBitmapImageRep *bitmapRep;
-    for (NSImageRep *imageRep in animatedImage.representations) {
-        if ([imageRep isKindOfClass:[NSBitmapImageRep class]]) {
-            bitmapRep = (NSBitmapImageRep *)imageRep;
-            break;
-        }
-    }
-    if (bitmapRep) {
-        frameCount = [[bitmapRep valueForProperty:NSImageFrameCount] unsignedIntegerValue];
-    }
-    
-    if (frameCount == 0) {
-        return nil;
-    }
-    
-    for (size_t i = 0; i < frameCount; i++) {
-        @autoreleasepool {
-            // NSBitmapImageRep need to manually change frame. "Good taste" API
-            [bitmapRep setProperty:NSImageCurrentFrame withValue:@(i)];
-            float frameDuration = [[bitmapRep valueForProperty:NSImageCurrentFrameDuration] floatValue];
-            NSImage *frameImage = [[NSImage alloc] initWithCGImage:bitmapRep.CGImage size:CGSizeZero];
-            SDWebImageFrame *frame = [SDWebImageFrame frameWithImage:frameImage duration:frameDuration];
-            [frames addObject:frame];
-        }
-    }
-#endif
-    
-    return frames;
-}
-
-#if SD_UIKIT || SD_WATCH
-// Convert an EXIF image orientation to an iOS one.
-+ (UIImageOrientation)imageOrientationFromEXIFOrientation:(NSInteger)exifOrientation {
-    // CGImagePropertyOrientation is available on iOS 8 above. Currently kept for compatibility
-    UIImageOrientation imageOrientation = UIImageOrientationUp;
-    switch (exifOrientation) {
-        case 1:
-            imageOrientation = UIImageOrientationUp;
-            break;
-        case 3:
-            imageOrientation = UIImageOrientationDown;
-            break;
-        case 8:
-            imageOrientation = UIImageOrientationLeft;
-            break;
-        case 6:
-            imageOrientation = UIImageOrientationRight;
-            break;
-        case 2:
-            imageOrientation = UIImageOrientationUpMirrored;
-            break;
-        case 4:
-            imageOrientation = UIImageOrientationDownMirrored;
-            break;
-        case 5:
-            imageOrientation = UIImageOrientationLeftMirrored;
-            break;
-        case 7:
-            imageOrientation = UIImageOrientationRightMirrored;
-            break;
-        default:
-            break;
-    }
-    return imageOrientation;
-}
-
-// Convert an iOS orientation to an EXIF image orientation.
-+ (NSInteger)exifOrientationFromImageOrientation:(UIImageOrientation)imageOrientation {
-    // CGImagePropertyOrientation is available on iOS 8 above. Currently kept for compatibility
-    NSInteger exifOrientation = 1;
-    switch (imageOrientation) {
-        case UIImageOrientationUp:
-            exifOrientation = 1;
-            break;
-        case UIImageOrientationDown:
-            exifOrientation = 3;
-            break;
-        case UIImageOrientationLeft:
-            exifOrientation = 8;
-            break;
-        case UIImageOrientationRight:
-            exifOrientation = 6;
-            break;
-        case UIImageOrientationUpMirrored:
-            exifOrientation = 2;
-            break;
-        case UIImageOrientationDownMirrored:
-            exifOrientation = 4;
-            break;
-        case UIImageOrientationLeftMirrored:
-            exifOrientation = 5;
-            break;
-        case UIImageOrientationRightMirrored:
-            exifOrientation = 7;
-            break;
-        default:
-            break;
-    }
-    return exifOrientation;
-}
-#endif
-
-#pragma mark - Helper Fuction
-#if SD_UIKIT || SD_WATCH
-static NSUInteger gcd(NSUInteger a, NSUInteger b) {
-    NSUInteger c;
-    while (a != 0) {
-        c = a;
-        a = b % a;
-        b = c;
-    }
-    return b;
-}
-
-static NSUInteger gcdArray(size_t const count, NSUInteger const * const values) {
-    if (count == 0) {
-        return 0;
-    }
-    NSUInteger result = values[0];
-    for (size_t i = 1; i < count; ++i) {
-        result = gcd(values[i], result);
-    }
-    return result;
-}
-#endif
-
-@end
diff --git a/SDWebImage/SDWebImageCodersManager.m b/SDWebImage/SDWebImageCodersManager.m
deleted file mode 100644
index 883d1fdb4..000000000
--- a/SDWebImage/SDWebImageCodersManager.m
+++ /dev/null
@@ -1,148 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "SDWebImageCodersManager.h"
-#import "SDWebImageImageIOCoder.h"
-#import "SDWebImageGIFCoder.h"
-#ifdef SD_WEBP
-#import "SDWebImageWebPCoder.h"
-#endif
-#import "UIImage+MultiFormat.h"
-
-#define LOCK(lock) dispatch_semaphore_wait(lock, DISPATCH_TIME_FOREVER);
-#define UNLOCK(lock) dispatch_semaphore_signal(lock);
-
-@interface SDWebImageCodersManager ()
-
-@property (nonatomic, strong, nonnull) dispatch_semaphore_t codersLock;
-
-@end
-
-@implementation SDWebImageCodersManager
-
-+ (nonnull instancetype)sharedInstance {
-    static dispatch_once_t once;
-    static id instance;
-    dispatch_once(&once, ^{
-        instance = [self new];
-    });
-    return instance;
-}
-
-- (instancetype)init {
-    if (self = [super init]) {
-        // initialize with default coders
-        NSMutableArray<id<SDWebImageCoder>> *mutableCoders = [@[[SDWebImageImageIOCoder sharedCoder]] mutableCopy];
-#ifdef SD_WEBP
-        [mutableCoders addObject:[SDWebImageWebPCoder sharedCoder]];
-#endif
-        _coders = [mutableCoders copy];
-        _codersLock = dispatch_semaphore_create(1);
-    }
-    return self;
-}
-
-#pragma mark - Coder IO operations
-
-- (void)addCoder:(nonnull id<SDWebImageCoder>)coder {
-    if (![coder conformsToProtocol:@protocol(SDWebImageCoder)]) {
-        return;
-    }
-    LOCK(self.codersLock);
-    NSMutableArray<id<SDWebImageCoder>> *mutableCoders = [self.coders mutableCopy];
-    if (!mutableCoders) {
-        mutableCoders = [NSMutableArray array];
-    }
-    [mutableCoders addObject:coder];
-    self.coders = [mutableCoders copy];
-    UNLOCK(self.codersLock);
-}
-
-- (void)removeCoder:(nonnull id<SDWebImageCoder>)coder {
-    if (![coder conformsToProtocol:@protocol(SDWebImageCoder)]) {
-        return;
-    }
-    LOCK(self.codersLock);
-    NSMutableArray<id<SDWebImageCoder>> *mutableCoders = [self.coders mutableCopy];
-    [mutableCoders removeObject:coder];
-    self.coders = [mutableCoders copy];
-    UNLOCK(self.codersLock);
-}
-
-#pragma mark - SDWebImageCoder
-- (BOOL)canDecodeFromData:(NSData *)data {
-    LOCK(self.codersLock);
-    NSArray<id<SDWebImageCoder>> *coders = self.coders;
-    UNLOCK(self.codersLock);
-    for (id<SDWebImageCoder> coder in coders.reverseObjectEnumerator) {
-        if ([coder canDecodeFromData:data]) {
-            return YES;
-        }
-    }
-    return NO;
-}
-
-- (BOOL)canEncodeToFormat:(SDImageFormat)format {
-    LOCK(self.codersLock);
-    NSArray<id<SDWebImageCoder>> *coders = self.coders;
-    UNLOCK(self.codersLock);
-    for (id<SDWebImageCoder> coder in coders.reverseObjectEnumerator) {
-        if ([coder canEncodeToFormat:format]) {
-            return YES;
-        }
-    }
-    return NO;
-}
-
-- (UIImage *)decodedImageWithData:(NSData *)data {
-    LOCK(self.codersLock);
-    NSArray<id<SDWebImageCoder>> *coders = self.coders;
-    UNLOCK(self.codersLock);
-    for (id<SDWebImageCoder> coder in coders.reverseObjectEnumerator) {
-        if ([coder canDecodeFromData:data]) {
-            return [coder decodedImageWithData:data];
-        }
-    }
-    return nil;
-}
-
-- (UIImage *)decompressedImageWithImage:(UIImage *)image
-                                   data:(NSData *__autoreleasing  _Nullable *)data
-                                options:(nullable NSDictionary<NSString*, NSObject*>*)optionsDict {
-    if (!image) {
-        return nil;
-    }
-    LOCK(self.codersLock);
-    NSArray<id<SDWebImageCoder>> *coders = self.coders;
-    UNLOCK(self.codersLock);
-    for (id<SDWebImageCoder> coder in coders.reverseObjectEnumerator) {
-        if ([coder canDecodeFromData:*data]) {
-            UIImage *decompressedImage = [coder decompressedImageWithImage:image data:data options:optionsDict];
-            decompressedImage.sd_imageFormat = image.sd_imageFormat;
-            return decompressedImage;
-        }
-    }
-    return nil;
-}
-
-- (NSData *)encodedDataWithImage:(UIImage *)image format:(SDImageFormat)format {
-    if (!image) {
-        return nil;
-    }
-    LOCK(self.codersLock);
-    NSArray<id<SDWebImageCoder>> *coders = self.coders;
-    UNLOCK(self.codersLock);
-    for (id<SDWebImageCoder> coder in coders.reverseObjectEnumerator) {
-        if ([coder canEncodeToFormat:format]) {
-            return [coder encodedDataWithImage:image format:format];
-        }
-    }
-    return nil;
-}
-
-@end
diff --git a/SDWebImage/SDWebImageCompat.m b/SDWebImage/SDWebImageCompat.m
deleted file mode 100644
index daee7fc94..000000000
--- a/SDWebImage/SDWebImageCompat.m
+++ /dev/null
@@ -1,69 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "SDWebImageCompat.h"
-#import "UIImage+MultiFormat.h"
-
-#if !__has_feature(objc_arc)
-    #error SDWebImage is ARC only. Either turn on ARC for the project or use -fobjc-arc flag
-#endif
-
-#if !OS_OBJECT_USE_OBJC
-    #error SDWebImage need ARC for dispatch object
-#endif
-
-inline UIImage *SDScaledImageForKey(NSString * _Nullable key, UIImage * _Nullable image) {
-    if (!image) {
-        return nil;
-    }
-    
-#if SD_MAC
-    return image;
-#elif SD_UIKIT || SD_WATCH
-    if ((image.images).count > 0) {
-        NSMutableArray<UIImage *> *scaledImages = [NSMutableArray array];
-
-        for (UIImage *tempImage in image.images) {
-            [scaledImages addObject:SDScaledImageForKey(key, tempImage)];
-        }
-        
-        UIImage *animatedImage = [UIImage animatedImageWithImages:scaledImages duration:image.duration];
-        if (animatedImage) {
-            animatedImage.sd_imageLoopCount = image.sd_imageLoopCount;
-            animatedImage.sd_imageFormat = image.sd_imageFormat;
-        }
-        return animatedImage;
-    } else {
-#if SD_WATCH
-        if ([[WKInterfaceDevice currentDevice] respondsToSelector:@selector(screenScale)]) {
-#elif SD_UIKIT
-        if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)]) {
-#endif
-            CGFloat scale = 1;
-            if (key.length >= 8) {
-                NSRange range = [key rangeOfString:@"@2x."];
-                if (range.location != NSNotFound) {
-                    scale = 2.0;
-                }
-                
-                range = [key rangeOfString:@"@3x."];
-                if (range.location != NSNotFound) {
-                    scale = 3.0;
-                }
-            }
-
-            UIImage *scaledImage = [[UIImage alloc] initWithCGImage:image.CGImage scale:scale orientation:image.imageOrientation];
-            scaledImage.sd_imageFormat = image.sd_imageFormat;
-            image = scaledImage;
-        }
-        return image;
-    }
-#endif
-}
-
-NSString *const SDWebImageErrorDomain = @"SDWebImageErrorDomain";
diff --git a/SDWebImage/SDWebImageDownloader.h b/SDWebImage/SDWebImageDownloader.h
deleted file mode 100644
index 906eaa7f8..000000000
--- a/SDWebImage/SDWebImageDownloader.h
+++ /dev/null
@@ -1,272 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import <Foundation/Foundation.h>
-#import "SDWebImageCompat.h"
-#import "SDWebImageOperation.h"
-
-typedef NS_OPTIONS(NSUInteger, SDWebImageDownloaderOptions) {
-    /**
-     * Put the download in the low queue priority and task priority.
-     */
-    SDWebImageDownloaderLowPriority = 1 << 0,
-    
-    /**
-     * This flag enables progressive download, the image is displayed progressively during download as a browser would do.
-     */
-    SDWebImageDownloaderProgressiveDownload = 1 << 1,
-
-    /**
-     * By default, request prevent the use of NSURLCache. With this flag, NSURLCache
-     * is used with default policies.
-     */
-    SDWebImageDownloaderUseNSURLCache = 1 << 2,
-
-    /**
-     * Call completion block with nil image/imageData if the image was read from NSURLCache
-     * (to be combined with `SDWebImageDownloaderUseNSURLCache`).
-     */
-    SDWebImageDownloaderIgnoreCachedResponse = 1 << 3,
-    
-    /**
-     * In iOS 4+, continue the download of the image if the app goes to background. This is achieved by asking the system for
-     * extra time in background to let the request finish. If the background task expires the operation will be cancelled.
-     */
-    SDWebImageDownloaderContinueInBackground = 1 << 4,
-
-    /**
-     * Handles cookies stored in NSHTTPCookieStore by setting 
-     * NSMutableURLRequest.HTTPShouldHandleCookies = YES;
-     */
-    SDWebImageDownloaderHandleCookies = 1 << 5,
-
-    /**
-     * Enable to allow untrusted SSL certificates.
-     * Useful for testing purposes. Use with caution in production.
-     */
-    SDWebImageDownloaderAllowInvalidSSLCertificates = 1 << 6,
-
-    /**
-     * Put the download in the high queue priority and task priority.
-     */
-    SDWebImageDownloaderHighPriority = 1 << 7,
-    
-    /**
-     * Scale down the image
-     */
-    SDWebImageDownloaderScaleDownLargeImages = 1 << 8,
-};
-
-typedef NS_ENUM(NSInteger, SDWebImageDownloaderExecutionOrder) {
-    /**
-     * Default value. All download operations will execute in queue style (first-in-first-out).
-     */
-    SDWebImageDownloaderFIFOExecutionOrder,
-
-    /**
-     * All download operations will execute in stack style (last-in-first-out).
-     */
-    SDWebImageDownloaderLIFOExecutionOrder
-};
-
-FOUNDATION_EXPORT NSString * _Nonnull const SDWebImageDownloadStartNotification;
-FOUNDATION_EXPORT NSString * _Nonnull const SDWebImageDownloadStopNotification;
-
-typedef void(^SDWebImageDownloaderProgressBlock)(NSInteger receivedSize, NSInteger expectedSize, NSURL * _Nullable targetURL);
-
-typedef void(^SDWebImageDownloaderCompletedBlock)(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished);
-
-typedef NSDictionary<NSString *, NSString *> SDHTTPHeadersDictionary;
-typedef NSMutableDictionary<NSString *, NSString *> SDHTTPHeadersMutableDictionary;
-
-typedef SDHTTPHeadersDictionary * _Nullable (^SDWebImageDownloaderHeadersFilterBlock)(NSURL * _Nullable url, SDHTTPHeadersDictionary * _Nullable headers);
-
-/**
- *  A token associated with each download. Can be used to cancel a download
- */
-@interface SDWebImageDownloadToken : NSObject <SDWebImageOperation>
-
-/**
- The download's URL. This should be readonly and you should not modify
- */
-@property (nonatomic, strong, nullable) NSURL *url;
-/**
- The cancel token taken from `addHandlersForProgress:completed`. This should be readonly and you should not modify
- @note use `-[SDWebImageDownloadToken cancel]` to cancel the token
- */
-@property (nonatomic, strong, nullable) id downloadOperationCancelToken;
-
-@end
-
-
-/**
- * Asynchronous downloader dedicated and optimized for image loading.
- */
-@interface SDWebImageDownloader : NSObject
-
-/**
- * Decompressing images that are downloaded and cached can improve performance but can consume lot of memory.
- * Defaults to YES. Set this to NO if you are experiencing a crash due to excessive memory consumption.
- */
-@property (assign, nonatomic) BOOL shouldDecompressImages;
-
-/**
- *  The maximum number of concurrent downloads
- */
-@property (assign, nonatomic) NSInteger maxConcurrentDownloads;
-
-/**
- * Shows the current amount of downloads that still need to be downloaded
- */
-@property (readonly, nonatomic) NSUInteger currentDownloadCount;
-
-/**
- *  The timeout value (in seconds) for the download operation. Default: 15.0.
- */
-@property (assign, nonatomic) NSTimeInterval downloadTimeout;
-
-/**
- * The configuration in use by the internal NSURLSession.
- * Mutating this object directly has no effect.
- *
- * @see createNewSessionWithConfiguration:
- */
-@property (readonly, nonatomic, nonnull) NSURLSessionConfiguration *sessionConfiguration;
-
-
-/**
- * Changes download operations execution order. Default value is `SDWebImageDownloaderFIFOExecutionOrder`.
- */
-@property (assign, nonatomic) SDWebImageDownloaderExecutionOrder executionOrder;
-
-/**
- *  Singleton method, returns the shared instance
- *
- *  @return global shared instance of downloader class
- */
-+ (nonnull instancetype)sharedDownloader;
-
-/**
- *  Set the default URL credential to be set for request operations.
- */
-@property (strong, nonatomic, nullable) NSURLCredential *urlCredential;
-
-/**
- * Set username
- */
-@property (strong, nonatomic, nullable) NSString *username;
-
-/**
- * Set password
- */
-@property (strong, nonatomic, nullable) NSString *password;
-
-/**
- * Set filter to pick headers for downloading image HTTP request.
- *
- * This block will be invoked for each downloading image request, returned
- * NSDictionary will be used as headers in corresponding HTTP request.
- */
-@property (nonatomic, copy, nullable) SDWebImageDownloaderHeadersFilterBlock headersFilter;
-
-/**
- * Creates an instance of a downloader with specified session configuration.
- * @note `timeoutIntervalForRequest` is going to be overwritten.
- * @return new instance of downloader class
- */
-- (nonnull instancetype)initWithSessionConfiguration:(nullable NSURLSessionConfiguration *)sessionConfiguration NS_DESIGNATED_INITIALIZER;
-
-/**
- * Set a value for a HTTP header to be appended to each download HTTP request.
- *
- * @param value The value for the header field. Use `nil` value to remove the header.
- * @param field The name of the header field to set.
- */
-- (void)setValue:(nullable NSString *)value forHTTPHeaderField:(nullable NSString *)field;
-
-/**
- * Returns the value of the specified HTTP header field.
- *
- * @return The value associated with the header field field, or `nil` if there is no corresponding header field.
- */
-- (nullable NSString *)valueForHTTPHeaderField:(nullable NSString *)field;
-
-/**
- * Sets a subclass of `NSOperation` and conforms to `SDWebImageDownloaderOperationInterface`.
- * Default is `SDWebImageDownloaderOperation`.
- * Can be used each time SDWebImage constructs a request
- * operation to download an image.
- *
- * @param operationClass The subclass of `NSOperation` and conforms to `SDWebImageDownloaderOperationInterface`.
- * Default is `SDWebImageDownloaderOperation`, Passing `nil` will revert to `SDWebImageDownloaderOperation`.
- */
-- (void)setOperationClass:(nullable Class)operationClass;
-
-/**
- * Creates a SDWebImageDownloader async downloader instance with a given URL
- *
- * The delegate will be informed when the image is finish downloaded or an error has happen.
- *
- * @see SDWebImageDownloaderDelegate
- *
- * @param url            The URL to the image to download
- * @param options        The options to be used for this download
- * @param progressBlock  A block called repeatedly while the image is downloading
- *                       @note the progress block is executed on a background queue
- * @param completedBlock A block called once the download is completed.
- *                       If the download succeeded, the image parameter is set, in case of error,
- *                       error parameter is set with the error. The last parameter is always YES
- *                       if SDWebImageDownloaderProgressiveDownload isn't use. With the
- *                       SDWebImageDownloaderProgressiveDownload option, this block is called
- *                       repeatedly with the partial image object and the finished argument set to NO
- *                       before to be called a last time with the full image and finished argument
- *                       set to YES. In case of error, the finished argument is always YES.
- *
- * @return A token (SDWebImageDownloadToken) that can be passed to -cancel: to cancel this operation
- */
-- (nullable SDWebImageDownloadToken *)downloadImageWithURL:(nullable NSURL *)url
-                                                   options:(SDWebImageDownloaderOptions)options
-                                                  progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
-                                                 completed:(nullable SDWebImageDownloaderCompletedBlock)completedBlock;
-
-/**
- * Cancels a download that was previously queued using -downloadImageWithURL:options:progress:completed:
- *
- * @param token The token received from -downloadImageWithURL:options:progress:completed: that should be canceled.
- */
-- (void)cancel:(nullable SDWebImageDownloadToken *)token;
-
-/**
- * Sets the download queue suspension state
- */
-- (void)setSuspended:(BOOL)suspended;
-
-/**
- * Cancels all download operations in the queue
- */
-- (void)cancelAllDownloads;
-
-/**
- * Forces SDWebImageDownloader to create and use a new NSURLSession that is
- * initialized with the given configuration.
- * @note All existing download operations in the queue will be cancelled.
- * @note `timeoutIntervalForRequest` is going to be overwritten.
- *
- * @param sessionConfiguration The configuration to use for the new NSURLSession
- */
-- (void)createNewSessionWithConfiguration:(nonnull NSURLSessionConfiguration *)sessionConfiguration;
-
-/**
- * Invalidates the managed session, optionally canceling pending operations.
- * @note If you use custom downloader instead of the shared downloader, you need call this method when you do not use it to avoid memory leak
- * @param cancelPendingOperations Whether or not to cancel pending operations.
- * @note Calling this method on the shared downloader has no effect.
- */
-- (void)invalidateSessionAndCancel:(BOOL)cancelPendingOperations;
-
-@end
diff --git a/SDWebImage/SDWebImageDownloader.m b/SDWebImage/SDWebImageDownloader.m
deleted file mode 100644
index a0950c996..000000000
--- a/SDWebImage/SDWebImageDownloader.m
+++ /dev/null
@@ -1,404 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "SDWebImageDownloader.h"
-#import "SDWebImageDownloaderOperation.h"
-
-#define LOCK(lock) dispatch_semaphore_wait(lock, DISPATCH_TIME_FOREVER);
-#define UNLOCK(lock) dispatch_semaphore_signal(lock);
-
-@interface SDWebImageDownloadToken ()
-
-@property (nonatomic, weak, nullable) NSOperation<SDWebImageDownloaderOperationInterface> *downloadOperation;
-
-@end
-
-@implementation SDWebImageDownloadToken
-
-- (void)cancel {
-    if (self.downloadOperation) {
-        SDWebImageDownloadToken *cancelToken = self.downloadOperationCancelToken;
-        if (cancelToken) {
-            [self.downloadOperation cancel:cancelToken];
-        }
-    }
-}
-
-@end
-
-
-@interface SDWebImageDownloader () <NSURLSessionTaskDelegate, NSURLSessionDataDelegate>
-
-@property (strong, nonatomic, nonnull) NSOperationQueue *downloadQueue;
-@property (weak, nonatomic, nullable) NSOperation *lastAddedOperation;
-@property (assign, nonatomic, nullable) Class operationClass;
-@property (strong, nonatomic, nonnull) NSMutableDictionary<NSURL *, NSOperation<SDWebImageDownloaderOperationInterface> *> *URLOperations;
-@property (strong, nonatomic, nullable) SDHTTPHeadersMutableDictionary *HTTPHeaders;
-@property (strong, nonatomic, nonnull) dispatch_semaphore_t operationsLock; // a lock to keep the access to `URLOperations` thread-safe
-@property (strong, nonatomic, nonnull) dispatch_semaphore_t headersLock; // a lock to keep the access to `HTTPHeaders` thread-safe
-
-// The session in which data tasks will run
-@property (strong, nonatomic) NSURLSession *session;
-
-@end
-
-@implementation SDWebImageDownloader
-
-+ (void)initialize {
-    // Bind SDNetworkActivityIndicator if available (download it here: http://github.com/rs/SDNetworkActivityIndicator )
-    // To use it, just add #import "SDNetworkActivityIndicator.h" in addition to the SDWebImage import
-    if (NSClassFromString(@"SDNetworkActivityIndicator")) {
-
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
-        id activityIndicator = [NSClassFromString(@"SDNetworkActivityIndicator") performSelector:NSSelectorFromString(@"sharedActivityIndicator")];
-#pragma clang diagnostic pop
-
-        // Remove observer in case it was previously added.
-        [[NSNotificationCenter defaultCenter] removeObserver:activityIndicator name:SDWebImageDownloadStartNotification object:nil];
-        [[NSNotificationCenter defaultCenter] removeObserver:activityIndicator name:SDWebImageDownloadStopNotification object:nil];
-
-        [[NSNotificationCenter defaultCenter] addObserver:activityIndicator
-                                                 selector:NSSelectorFromString(@"startActivity")
-                                                     name:SDWebImageDownloadStartNotification object:nil];
-        [[NSNotificationCenter defaultCenter] addObserver:activityIndicator
-                                                 selector:NSSelectorFromString(@"stopActivity")
-                                                     name:SDWebImageDownloadStopNotification object:nil];
-    }
-}
-
-+ (nonnull instancetype)sharedDownloader {
-    static dispatch_once_t once;
-    static id instance;
-    dispatch_once(&once, ^{
-        instance = [self new];
-    });
-    return instance;
-}
-
-- (nonnull instancetype)init {
-    return [self initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
-}
-
-- (nonnull instancetype)initWithSessionConfiguration:(nullable NSURLSessionConfiguration *)sessionConfiguration {
-    if ((self = [super init])) {
-        _operationClass = [SDWebImageDownloaderOperation class];
-        _shouldDecompressImages = YES;
-        _executionOrder = SDWebImageDownloaderFIFOExecutionOrder;
-        _downloadQueue = [NSOperationQueue new];
-        _downloadQueue.maxConcurrentOperationCount = 6;
-        _downloadQueue.name = @"com.hackemist.SDWebImageDownloader";
-        _URLOperations = [NSMutableDictionary new];
-#ifdef SD_WEBP
-        _HTTPHeaders = [@{@"Accept": @"image/webp,image/*;q=0.8"} mutableCopy];
-#else
-        _HTTPHeaders = [@{@"Accept": @"image/*;q=0.8"} mutableCopy];
-#endif
-        _operationsLock = dispatch_semaphore_create(1);
-        _headersLock = dispatch_semaphore_create(1);
-        _downloadTimeout = 15.0;
-
-        [self createNewSessionWithConfiguration:sessionConfiguration];
-    }
-    return self;
-}
-
-- (void)createNewSessionWithConfiguration:(NSURLSessionConfiguration *)sessionConfiguration {
-    [self cancelAllDownloads];
-
-    if (self.session) {
-        [self.session invalidateAndCancel];
-    }
-
-    sessionConfiguration.timeoutIntervalForRequest = self.downloadTimeout;
-
-    /**
-     *  Create the session for this task
-     *  We send nil as delegate queue so that the session creates a serial operation queue for performing all delegate
-     *  method calls and completion handler calls.
-     */
-    self.session = [NSURLSession sessionWithConfiguration:sessionConfiguration
-                                                 delegate:self
-                                            delegateQueue:nil];
-}
-
-- (void)invalidateSessionAndCancel:(BOOL)cancelPendingOperations {
-    if (self == [SDWebImageDownloader sharedDownloader]) {
-        return;
-    }
-    if (cancelPendingOperations) {
-        [self.session invalidateAndCancel];
-    } else {
-        [self.session finishTasksAndInvalidate];
-    }
-}
-
-- (void)dealloc {
-    [self.session invalidateAndCancel];
-    self.session = nil;
-
-    [self.downloadQueue cancelAllOperations];
-}
-
-- (void)setValue:(nullable NSString *)value forHTTPHeaderField:(nullable NSString *)field {
-    LOCK(self.headersLock);
-    if (value) {
-        self.HTTPHeaders[field] = value;
-    } else {
-        [self.HTTPHeaders removeObjectForKey:field];
-    }
-    UNLOCK(self.headersLock);
-}
-
-- (nullable NSString *)valueForHTTPHeaderField:(nullable NSString *)field {
-    if (!field) {
-        return nil;
-    }
-    return [[self allHTTPHeaderFields] objectForKey:field];
-}
-
-- (nonnull SDHTTPHeadersDictionary *)allHTTPHeaderFields {
-    LOCK(self.headersLock);
-    SDHTTPHeadersDictionary *allHTTPHeaderFields = [self.HTTPHeaders copy];
-    UNLOCK(self.headersLock);
-    return allHTTPHeaderFields;
-}
-
-- (void)setMaxConcurrentDownloads:(NSInteger)maxConcurrentDownloads {
-    _downloadQueue.maxConcurrentOperationCount = maxConcurrentDownloads;
-}
-
-- (NSUInteger)currentDownloadCount {
-    return _downloadQueue.operationCount;
-}
-
-- (NSInteger)maxConcurrentDownloads {
-    return _downloadQueue.maxConcurrentOperationCount;
-}
-
-- (NSURLSessionConfiguration *)sessionConfiguration {
-    return self.session.configuration;
-}
-
-- (void)setOperationClass:(nullable Class)operationClass {
-    if (operationClass && [operationClass isSubclassOfClass:[NSOperation class]] && [operationClass conformsToProtocol:@protocol(SDWebImageDownloaderOperationInterface)]) {
-        _operationClass = operationClass;
-    } else {
-        _operationClass = [SDWebImageDownloaderOperation class];
-    }
-}
-
-- (NSOperation<SDWebImageDownloaderOperationInterface> *)createDownloaderOperationWithUrl:(nullable NSURL *)url
-                                                                                  options:(SDWebImageDownloaderOptions)options {
-    NSTimeInterval timeoutInterval = self.downloadTimeout;
-    if (timeoutInterval == 0.0) {
-        timeoutInterval = 15.0;
-    }
-
-    // In order to prevent from potential duplicate caching (NSURLCache + SDImageCache) we disable the cache for image requests if told otherwise
-    NSURLRequestCachePolicy cachePolicy = options & SDWebImageDownloaderUseNSURLCache ? NSURLRequestUseProtocolCachePolicy : NSURLRequestReloadIgnoringLocalCacheData;
-    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url
-                                                                cachePolicy:cachePolicy
-                                                            timeoutInterval:timeoutInterval];
-    
-    request.HTTPShouldHandleCookies = (options & SDWebImageDownloaderHandleCookies);
-    request.HTTPShouldUsePipelining = YES;
-    if (self.headersFilter) {
-        request.allHTTPHeaderFields = self.headersFilter(url, [self allHTTPHeaderFields]);
-    }
-    else {
-        request.allHTTPHeaderFields = [self allHTTPHeaderFields];
-    }
-    NSOperation<SDWebImageDownloaderOperationInterface> *operation = [[self.operationClass alloc] initWithRequest:request inSession:self.session options:options];
-    operation.shouldDecompressImages = self.shouldDecompressImages;
-    
-    if (self.urlCredential) {
-        operation.credential = self.urlCredential;
-    } else if (self.username && self.password) {
-        operation.credential = [NSURLCredential credentialWithUser:self.username password:self.password persistence:NSURLCredentialPersistenceForSession];
-    }
-    
-    if (options & SDWebImageDownloaderHighPriority) {
-        operation.queuePriority = NSOperationQueuePriorityHigh;
-    } else if (options & SDWebImageDownloaderLowPriority) {
-        operation.queuePriority = NSOperationQueuePriorityLow;
-    }
-    
-    if (self.executionOrder == SDWebImageDownloaderLIFOExecutionOrder) {
-        // Emulate LIFO execution order by systematically adding new operations as last operation's dependency
-        [self.lastAddedOperation addDependency:operation];
-        self.lastAddedOperation = operation;
-    }
-
-    return operation;
-}
-
-- (void)cancel:(nullable SDWebImageDownloadToken *)token {
-    NSURL *url = token.url;
-    if (!url) {
-        return;
-    }
-    LOCK(self.operationsLock);
-    NSOperation<SDWebImageDownloaderOperationInterface> *operation = [self.URLOperations objectForKey:url];
-    if (operation) {
-        BOOL canceled = [operation cancel:token.downloadOperationCancelToken];
-        if (canceled) {
-            [self.URLOperations removeObjectForKey:url];
-        }
-    }
-    UNLOCK(self.operationsLock);
-}
-
-- (nullable SDWebImageDownloadToken *)downloadImageWithURL:(nullable NSURL *)url
-                                                   options:(SDWebImageDownloaderOptions)options
-                                                  progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
-                                                 completed:(nullable SDWebImageDownloaderCompletedBlock)completedBlock {
-    // The URL will be used as the key to the callbacks dictionary so it cannot be nil. If it is nil immediately call the completed block with no image or data.
-    if (url == nil) {
-        if (completedBlock != nil) {
-            completedBlock(nil, nil, nil, NO);
-        }
-        return nil;
-    }
-    
-    LOCK(self.operationsLock);
-    NSOperation<SDWebImageDownloaderOperationInterface> *operation = [self.URLOperations objectForKey:url];
-    // There is a case that the operation may be marked as finished, but not been removed from `self.URLOperations`.
-    if (!operation || operation.isFinished) {
-        operation = [self createDownloaderOperationWithUrl:url options:options];
-        __weak typeof(self) wself = self;
-        operation.completionBlock = ^{
-            __strong typeof(wself) sself = wself;
-            if (!sself) {
-                return;
-            }
-            LOCK(sself.operationsLock);
-            [sself.URLOperations removeObjectForKey:url];
-            UNLOCK(sself.operationsLock);
-        };
-        [self.URLOperations setObject:operation forKey:url];
-        // Add operation to operation queue only after all configuration done according to Apple's doc.
-        // `addOperation:` does not synchronously execute the `operation.completionBlock` so this will not cause deadlock.
-        [self.downloadQueue addOperation:operation];
-    }
-    UNLOCK(self.operationsLock);
-
-    id downloadOperationCancelToken = [operation addHandlersForProgress:progressBlock completed:completedBlock];
-    
-    SDWebImageDownloadToken *token = [SDWebImageDownloadToken new];
-    token.downloadOperation = operation;
-    token.url = url;
-    token.downloadOperationCancelToken = downloadOperationCancelToken;
-
-    return token;
-}
-
-- (void)setSuspended:(BOOL)suspended {
-    self.downloadQueue.suspended = suspended;
-}
-
-- (void)cancelAllDownloads {
-    [self.downloadQueue cancelAllOperations];
-}
-
-#pragma mark Helper methods
-
-- (NSOperation<SDWebImageDownloaderOperationInterface> *)operationWithTask:(NSURLSessionTask *)task {
-    NSOperation<SDWebImageDownloaderOperationInterface> *returnOperation = nil;
-    for (NSOperation<SDWebImageDownloaderOperationInterface> *operation in self.downloadQueue.operations) {
-        if ([operation respondsToSelector:@selector(dataTask)]) {
-            if (operation.dataTask.taskIdentifier == task.taskIdentifier) {
-                returnOperation = operation;
-                break;
-            }
-        }
-    }
-    return returnOperation;
-}
-
-#pragma mark NSURLSessionDataDelegate
-
-- (void)URLSession:(NSURLSession *)session
-          dataTask:(NSURLSessionDataTask *)dataTask
-didReceiveResponse:(NSURLResponse *)response
- completionHandler:(void (^)(NSURLSessionResponseDisposition disposition))completionHandler {
-
-    // Identify the operation that runs this task and pass it the delegate method
-    NSOperation<SDWebImageDownloaderOperationInterface> *dataOperation = [self operationWithTask:dataTask];
-    if ([dataOperation respondsToSelector:@selector(URLSession:dataTask:didReceiveResponse:completionHandler:)]) {
-        [dataOperation URLSession:session dataTask:dataTask didReceiveResponse:response completionHandler:completionHandler];
-    } else {
-        if (completionHandler) {
-            completionHandler(NSURLSessionResponseAllow);
-        }
-    }
-}
-
-- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data {
-
-    // Identify the operation that runs this task and pass it the delegate method
-    NSOperation<SDWebImageDownloaderOperationInterface> *dataOperation = [self operationWithTask:dataTask];
-    if ([dataOperation respondsToSelector:@selector(URLSession:dataTask:didReceiveData:)]) {
-        [dataOperation URLSession:session dataTask:dataTask didReceiveData:data];
-    }
-}
-
-- (void)URLSession:(NSURLSession *)session
-          dataTask:(NSURLSessionDataTask *)dataTask
- willCacheResponse:(NSCachedURLResponse *)proposedResponse
- completionHandler:(void (^)(NSCachedURLResponse *cachedResponse))completionHandler {
-
-    // Identify the operation that runs this task and pass it the delegate method
-    NSOperation<SDWebImageDownloaderOperationInterface> *dataOperation = [self operationWithTask:dataTask];
-    if ([dataOperation respondsToSelector:@selector(URLSession:dataTask:willCacheResponse:completionHandler:)]) {
-        [dataOperation URLSession:session dataTask:dataTask willCacheResponse:proposedResponse completionHandler:completionHandler];
-    } else {
-        if (completionHandler) {
-            completionHandler(proposedResponse);
-        }
-    }
-}
-
-#pragma mark NSURLSessionTaskDelegate
-
-- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error {
-    
-    // Identify the operation that runs this task and pass it the delegate method
-    NSOperation<SDWebImageDownloaderOperationInterface> *dataOperation = [self operationWithTask:task];
-    if ([dataOperation respondsToSelector:@selector(URLSession:task:didCompleteWithError:)]) {
-        [dataOperation URLSession:session task:task didCompleteWithError:error];
-    }
-}
-
-- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task willPerformHTTPRedirection:(NSHTTPURLResponse *)response newRequest:(NSURLRequest *)request completionHandler:(void (^)(NSURLRequest * _Nullable))completionHandler {
-    
-    // Identify the operation that runs this task and pass it the delegate method
-    NSOperation<SDWebImageDownloaderOperationInterface> *dataOperation = [self operationWithTask:task];
-    if ([dataOperation respondsToSelector:@selector(URLSession:task:willPerformHTTPRedirection:newRequest:completionHandler:)]) {
-        [dataOperation URLSession:session task:task willPerformHTTPRedirection:response newRequest:request completionHandler:completionHandler];
-    } else {
-        if (completionHandler) {
-            completionHandler(request);
-        }
-    }
-}
-
-- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential *credential))completionHandler {
-
-    // Identify the operation that runs this task and pass it the delegate method
-    NSOperation<SDWebImageDownloaderOperationInterface> *dataOperation = [self operationWithTask:task];
-    if ([dataOperation respondsToSelector:@selector(URLSession:task:didReceiveChallenge:completionHandler:)]) {
-        [dataOperation URLSession:session task:task didReceiveChallenge:challenge completionHandler:completionHandler];
-    } else {
-        if (completionHandler) {
-            completionHandler(NSURLSessionAuthChallengePerformDefaultHandling, nil);
-        }
-    }
-}
-
-@end
diff --git a/SDWebImage/SDWebImageDownloaderOperation.h b/SDWebImage/SDWebImageDownloaderOperation.h
deleted file mode 100644
index 6d9d95ca9..000000000
--- a/SDWebImage/SDWebImageDownloaderOperation.h
+++ /dev/null
@@ -1,128 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import <Foundation/Foundation.h>
-#import "SDWebImageDownloader.h"
-#import "SDWebImageOperation.h"
-
-FOUNDATION_EXPORT NSString * _Nonnull const SDWebImageDownloadStartNotification;
-FOUNDATION_EXPORT NSString * _Nonnull const SDWebImageDownloadReceiveResponseNotification;
-FOUNDATION_EXPORT NSString * _Nonnull const SDWebImageDownloadStopNotification;
-FOUNDATION_EXPORT NSString * _Nonnull const SDWebImageDownloadFinishNotification;
-
-
-
-/**
- Describes a downloader operation. If one wants to use a custom downloader op, it needs to inherit from `NSOperation` and conform to this protocol
- For the description about these methods, see `SDWebImageDownloaderOperation`
- */
-@protocol SDWebImageDownloaderOperationInterface <NSURLSessionTaskDelegate, NSURLSessionDataDelegate>
-@required
-- (nonnull instancetype)initWithRequest:(nullable NSURLRequest *)request
-                              inSession:(nullable NSURLSession *)session
-                                options:(SDWebImageDownloaderOptions)options;
-
-- (nullable id)addHandlersForProgress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
-                            completed:(nullable SDWebImageDownloaderCompletedBlock)completedBlock;
-
-- (BOOL)shouldDecompressImages;
-- (void)setShouldDecompressImages:(BOOL)value;
-
-- (nullable NSURLCredential *)credential;
-- (void)setCredential:(nullable NSURLCredential *)value;
-
-- (BOOL)cancel:(nullable id)token;
-
-@optional
-- (nullable NSURLSessionTask *)dataTask;
-
-@end
-
-
-@interface SDWebImageDownloaderOperation : NSOperation <SDWebImageDownloaderOperationInterface, SDWebImageOperation>
-
-/**
- * The request used by the operation's task.
- */
-@property (strong, nonatomic, readonly, nullable) NSURLRequest *request;
-
-/**
- * The operation's task
- */
-@property (strong, nonatomic, readonly, nullable) NSURLSessionTask *dataTask;
-
-
-@property (assign, nonatomic) BOOL shouldDecompressImages;
-
-/**
- *  Was used to determine whether the URL connection should consult the credential storage for authenticating the connection.
- *  @deprecated Not used for a couple of versions
- */
-@property (nonatomic, assign) BOOL shouldUseCredentialStorage __deprecated_msg("Property deprecated. Does nothing. Kept only for backwards compatibility");
-
-/**
- * The credential used for authentication challenges in `-URLSession:task:didReceiveChallenge:completionHandler:`.
- *
- * This will be overridden by any shared credentials that exist for the username or password of the request URL, if present.
- */
-@property (nonatomic, strong, nullable) NSURLCredential *credential;
-
-/**
- * The SDWebImageDownloaderOptions for the receiver.
- */
-@property (assign, nonatomic, readonly) SDWebImageDownloaderOptions options;
-
-/**
- * The expected size of data.
- */
-@property (assign, nonatomic) NSInteger expectedSize;
-
-/**
- * The response returned by the operation's task.
- */
-@property (strong, nonatomic, nullable) NSURLResponse *response;
-
-/**
- *  Initializes a `SDWebImageDownloaderOperation` object
- *
- *  @see SDWebImageDownloaderOperation
- *
- *  @param request        the URL request
- *  @param session        the URL session in which this operation will run
- *  @param options        downloader options
- *
- *  @return the initialized instance
- */
-- (nonnull instancetype)initWithRequest:(nullable NSURLRequest *)request
-                              inSession:(nullable NSURLSession *)session
-                                options:(SDWebImageDownloaderOptions)options NS_DESIGNATED_INITIALIZER;
-
-/**
- *  Adds handlers for progress and completion. Returns a tokent that can be passed to -cancel: to cancel this set of
- *  callbacks.
- *
- *  @param progressBlock  the block executed when a new chunk of data arrives.
- *                        @note the progress block is executed on a background queue
- *  @param completedBlock the block executed when the download is done.
- *                        @note the completed block is executed on the main queue for success. If errors are found, there is a chance the block will be executed on a background queue
- *
- *  @return the token to use to cancel this set of handlers
- */
-- (nullable id)addHandlersForProgress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
-                            completed:(nullable SDWebImageDownloaderCompletedBlock)completedBlock;
-
-/**
- *  Cancels a set of callbacks. Once all callbacks are canceled, the operation is cancelled.
- *
- *  @param token the token representing a set of callbacks to cancel
- *
- *  @return YES if the operation was stopped because this was the last token to be canceled. NO otherwise.
- */
-- (BOOL)cancel:(nullable id)token;
-
-@end
diff --git a/SDWebImage/SDWebImageDownloaderOperation.m b/SDWebImage/SDWebImageDownloaderOperation.m
deleted file mode 100644
index 722645f0e..000000000
--- a/SDWebImage/SDWebImageDownloaderOperation.m
+++ /dev/null
@@ -1,516 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "SDWebImageDownloaderOperation.h"
-#import "SDWebImageManager.h"
-#import "NSImage+WebCache.h"
-#import "SDWebImageCodersManager.h"
-
-#define LOCK(lock) dispatch_semaphore_wait(lock, DISPATCH_TIME_FOREVER);
-#define UNLOCK(lock) dispatch_semaphore_signal(lock);
-
-// iOS 8 Foundation.framework extern these symbol but the define is in CFNetwork.framework. We just fix this without import CFNetwork.framework
-#if (__IPHONE_OS_VERSION_MIN_REQUIRED && __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_9_0)
-const float NSURLSessionTaskPriorityHigh = 0.75;
-const float NSURLSessionTaskPriorityDefault = 0.5;
-const float NSURLSessionTaskPriorityLow = 0.25;
-#endif
-
-NSString *const SDWebImageDownloadStartNotification = @"SDWebImageDownloadStartNotification";
-NSString *const SDWebImageDownloadReceiveResponseNotification = @"SDWebImageDownloadReceiveResponseNotification";
-NSString *const SDWebImageDownloadStopNotification = @"SDWebImageDownloadStopNotification";
-NSString *const SDWebImageDownloadFinishNotification = @"SDWebImageDownloadFinishNotification";
-
-static NSString *const kProgressCallbackKey = @"progress";
-static NSString *const kCompletedCallbackKey = @"completed";
-
-typedef NSMutableDictionary<NSString *, id> SDCallbacksDictionary;
-
-@interface SDWebImageDownloaderOperation ()
-
-@property (strong, nonatomic, nonnull) NSMutableArray<SDCallbacksDictionary *> *callbackBlocks;
-
-@property (assign, nonatomic, getter = isExecuting) BOOL executing;
-@property (assign, nonatomic, getter = isFinished) BOOL finished;
-@property (strong, nonatomic, nullable) NSMutableData *imageData;
-@property (copy, nonatomic, nullable) NSData *cachedData; // for `SDWebImageDownloaderIgnoreCachedResponse`
-
-// This is weak because it is injected by whoever manages this session. If this gets nil-ed out, we won't be able to run
-// the task associated with this operation
-@property (weak, nonatomic, nullable) NSURLSession *unownedSession;
-// This is set if we're using not using an injected NSURLSession. We're responsible of invalidating this one
-@property (strong, nonatomic, nullable) NSURLSession *ownedSession;
-
-@property (strong, nonatomic, readwrite, nullable) NSURLSessionTask *dataTask;
-
-@property (strong, nonatomic, nonnull) dispatch_semaphore_t callbacksLock; // a lock to keep the access to `callbackBlocks` thread-safe
-
-@property (strong, nonatomic, nonnull) dispatch_queue_t coderQueue; // the queue to do image decoding
-#if SD_UIKIT
-@property (assign, nonatomic) UIBackgroundTaskIdentifier backgroundTaskId;
-#endif
-
-@property (strong, nonatomic, nullable) id<SDWebImageProgressiveCoder> progressiveCoder;
-
-@end
-
-@implementation SDWebImageDownloaderOperation
-
-@synthesize executing = _executing;
-@synthesize finished = _finished;
-
-- (nonnull instancetype)init {
-    return [self initWithRequest:nil inSession:nil options:0];
-}
-
-- (nonnull instancetype)initWithRequest:(nullable NSURLRequest *)request
-                              inSession:(nullable NSURLSession *)session
-                                options:(SDWebImageDownloaderOptions)options {
-    if ((self = [super init])) {
-        _request = [request copy];
-        _shouldDecompressImages = YES;
-        _options = options;
-        _callbackBlocks = [NSMutableArray new];
-        _executing = NO;
-        _finished = NO;
-        _expectedSize = 0;
-        _unownedSession = session;
-        _callbacksLock = dispatch_semaphore_create(1);
-        _coderQueue = dispatch_queue_create("com.hackemist.SDWebImageDownloaderOperationCoderQueue", DISPATCH_QUEUE_SERIAL);
-    }
-    return self;
-}
-
-- (nullable id)addHandlersForProgress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
-                            completed:(nullable SDWebImageDownloaderCompletedBlock)completedBlock {
-    SDCallbacksDictionary *callbacks = [NSMutableDictionary new];
-    if (progressBlock) callbacks[kProgressCallbackKey] = [progressBlock copy];
-    if (completedBlock) callbacks[kCompletedCallbackKey] = [completedBlock copy];
-    LOCK(self.callbacksLock);
-    [self.callbackBlocks addObject:callbacks];
-    UNLOCK(self.callbacksLock);
-    return callbacks;
-}
-
-- (nullable NSArray<id> *)callbacksForKey:(NSString *)key {
-    LOCK(self.callbacksLock);
-    NSMutableArray<id> *callbacks = [[self.callbackBlocks valueForKey:key] mutableCopy];
-    UNLOCK(self.callbacksLock);
-    // We need to remove [NSNull null] because there might not always be a progress block for each callback
-    [callbacks removeObjectIdenticalTo:[NSNull null]];
-    return [callbacks copy]; // strip mutability here
-}
-
-- (BOOL)cancel:(nullable id)token {
-    BOOL shouldCancel = NO;
-    LOCK(self.callbacksLock);
-    [self.callbackBlocks removeObjectIdenticalTo:token];
-    if (self.callbackBlocks.count == 0) {
-        shouldCancel = YES;
-    }
-    UNLOCK(self.callbacksLock);
-    if (shouldCancel) {
-        [self cancel];
-    }
-    return shouldCancel;
-}
-
-- (void)start {
-    @synchronized (self) {
-        if (self.isCancelled) {
-            self.finished = YES;
-            [self reset];
-            return;
-        }
-
-#if SD_UIKIT
-        Class UIApplicationClass = NSClassFromString(@"UIApplication");
-        BOOL hasApplication = UIApplicationClass && [UIApplicationClass respondsToSelector:@selector(sharedApplication)];
-        if (hasApplication && [self shouldContinueWhenAppEntersBackground]) {
-            __weak __typeof__ (self) wself = self;
-            UIApplication * app = [UIApplicationClass performSelector:@selector(sharedApplication)];
-            self.backgroundTaskId = [app beginBackgroundTaskWithExpirationHandler:^{
-                __strong __typeof (wself) sself = wself;
-
-                if (sself) {
-                    [sself cancel];
-
-                    [app endBackgroundTask:sself.backgroundTaskId];
-                    sself.backgroundTaskId = UIBackgroundTaskInvalid;
-                }
-            }];
-        }
-#endif
-        NSURLSession *session = self.unownedSession;
-        if (!session) {
-            NSURLSessionConfiguration *sessionConfig = [NSURLSessionConfiguration defaultSessionConfiguration];
-            sessionConfig.timeoutIntervalForRequest = 15;
-            
-            /**
-             *  Create the session for this task
-             *  We send nil as delegate queue so that the session creates a serial operation queue for performing all delegate
-             *  method calls and completion handler calls.
-             */
-            session = [NSURLSession sessionWithConfiguration:sessionConfig
-                                                    delegate:self
-                                               delegateQueue:nil];
-            self.ownedSession = session;
-        }
-        
-        if (self.options & SDWebImageDownloaderIgnoreCachedResponse) {
-            // Grab the cached data for later check
-            NSURLCache *URLCache = session.configuration.URLCache;
-            if (!URLCache) {
-                URLCache = [NSURLCache sharedURLCache];
-            }
-            NSCachedURLResponse *cachedResponse;
-            // NSURLCache's `cachedResponseForRequest:` is not thread-safe, see https://developer.apple.com/documentation/foundation/nsurlcache#2317483
-            @synchronized (URLCache) {
-                cachedResponse = [URLCache cachedResponseForRequest:self.request];
-            }
-            if (cachedResponse) {
-                self.cachedData = cachedResponse.data;
-            }
-        }
-        
-        self.dataTask = [session dataTaskWithRequest:self.request];
-        self.executing = YES;
-    }
-
-    if (self.dataTask) {
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wunguarded-availability"
-        if ([self.dataTask respondsToSelector:@selector(setPriority:)]) {
-            if (self.options & SDWebImageDownloaderHighPriority) {
-                self.dataTask.priority = NSURLSessionTaskPriorityHigh;
-            } else if (self.options & SDWebImageDownloaderLowPriority) {
-                self.dataTask.priority = NSURLSessionTaskPriorityLow;
-            }
-        }
-#pragma clang diagnostic pop
-        [self.dataTask resume];
-        for (SDWebImageDownloaderProgressBlock progressBlock in [self callbacksForKey:kProgressCallbackKey]) {
-            progressBlock(0, NSURLResponseUnknownLength, self.request.URL);
-        }
-        __weak typeof(self) weakSelf = self;
-        dispatch_async(dispatch_get_main_queue(), ^{
-            [[NSNotificationCenter defaultCenter] postNotificationName:SDWebImageDownloadStartNotification object:weakSelf];
-        });
-    } else {
-        [self callCompletionBlocksWithError:[NSError errorWithDomain:NSURLErrorDomain code:NSURLErrorUnknown userInfo:@{NSLocalizedDescriptionKey : @"Task can't be initialized"}]];
-        [self done];
-        return;
-    }
-
-#if SD_UIKIT
-    Class UIApplicationClass = NSClassFromString(@"UIApplication");
-    if(!UIApplicationClass || ![UIApplicationClass respondsToSelector:@selector(sharedApplication)]) {
-        return;
-    }
-    if (self.backgroundTaskId != UIBackgroundTaskInvalid) {
-        UIApplication * app = [UIApplication performSelector:@selector(sharedApplication)];
-        [app endBackgroundTask:self.backgroundTaskId];
-        self.backgroundTaskId = UIBackgroundTaskInvalid;
-    }
-#endif
-}
-
-- (void)cancel {
-    @synchronized (self) {
-        [self cancelInternal];
-    }
-}
-
-- (void)cancelInternal {
-    if (self.isFinished) return;
-    [super cancel];
-
-    if (self.dataTask) {
-        [self.dataTask cancel];
-        __weak typeof(self) weakSelf = self;
-        dispatch_async(dispatch_get_main_queue(), ^{
-            [[NSNotificationCenter defaultCenter] postNotificationName:SDWebImageDownloadStopNotification object:weakSelf];
-        });
-
-        // As we cancelled the task, its callback won't be called and thus won't
-        // maintain the isFinished and isExecuting flags.
-        if (self.isExecuting) self.executing = NO;
-        if (!self.isFinished) self.finished = YES;
-    }
-
-    [self reset];
-}
-
-- (void)done {
-    self.finished = YES;
-    self.executing = NO;
-    [self reset];
-}
-
-- (void)reset {
-    LOCK(self.callbacksLock);
-    [self.callbackBlocks removeAllObjects];
-    UNLOCK(self.callbacksLock);
-    self.dataTask = nil;
-    
-    if (self.ownedSession) {
-        [self.ownedSession invalidateAndCancel];
-        self.ownedSession = nil;
-    }
-}
-
-- (void)setFinished:(BOOL)finished {
-    [self willChangeValueForKey:@"isFinished"];
-    _finished = finished;
-    [self didChangeValueForKey:@"isFinished"];
-}
-
-- (void)setExecuting:(BOOL)executing {
-    [self willChangeValueForKey:@"isExecuting"];
-    _executing = executing;
-    [self didChangeValueForKey:@"isExecuting"];
-}
-
-- (BOOL)isConcurrent {
-    return YES;
-}
-
-#pragma mark NSURLSessionDataDelegate
-
-- (void)URLSession:(NSURLSession *)session
-          dataTask:(NSURLSessionDataTask *)dataTask
-didReceiveResponse:(NSURLResponse *)response
- completionHandler:(void (^)(NSURLSessionResponseDisposition disposition))completionHandler {
-    NSURLSessionResponseDisposition disposition = NSURLSessionResponseAllow;
-    NSInteger expected = (NSInteger)response.expectedContentLength;
-    expected = expected > 0 ? expected : 0;
-    self.expectedSize = expected;
-    self.response = response;
-    NSInteger statusCode = [response respondsToSelector:@selector(statusCode)] ? ((NSHTTPURLResponse *)response).statusCode : 200;
-    BOOL valid = statusCode < 400;
-    //'304 Not Modified' is an exceptional one. It should be treated as cancelled if no cache data
-    //URLSession current behavior will return 200 status code when the server respond 304 and URLCache hit. But this is not a standard behavior and we just add a check
-    if (statusCode == 304 && !self.cachedData) {
-        valid = NO;
-    }
-    
-    if (valid) {
-        for (SDWebImageDownloaderProgressBlock progressBlock in [self callbacksForKey:kProgressCallbackKey]) {
-            progressBlock(0, expected, self.request.URL);
-        }
-    } else {
-        // Status code invalid and marked as cancelled. Do not call `[self.dataTask cancel]` which may mass up URLSession life cycle
-        disposition = NSURLSessionResponseCancel;
-    }
-    
-    __weak typeof(self) weakSelf = self;
-    dispatch_async(dispatch_get_main_queue(), ^{
-        [[NSNotificationCenter defaultCenter] postNotificationName:SDWebImageDownloadReceiveResponseNotification object:weakSelf];
-    });
-    
-    if (completionHandler) {
-        completionHandler(disposition);
-    }
-}
-
-- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data {
-    if (!self.imageData) {
-        self.imageData = [[NSMutableData alloc] initWithCapacity:self.expectedSize];
-    }
-    [self.imageData appendData:data];
-
-    if ((self.options & SDWebImageDownloaderProgressiveDownload) && self.expectedSize > 0) {
-        // Get the image data
-        __block NSData *imageData = [self.imageData copy];
-        // Get the total bytes downloaded
-        const NSInteger totalSize = imageData.length;
-        // Get the finish status
-        BOOL finished = (totalSize >= self.expectedSize);
-        
-        if (!self.progressiveCoder) {
-            // We need to create a new instance for progressive decoding to avoid conflicts
-            for (id<SDWebImageCoder>coder in [SDWebImageCodersManager sharedInstance].coders) {
-                if ([coder conformsToProtocol:@protocol(SDWebImageProgressiveCoder)] &&
-                    [((id<SDWebImageProgressiveCoder>)coder) canIncrementallyDecodeFromData:imageData]) {
-                    self.progressiveCoder = [[[coder class] alloc] init];
-                    break;
-                }
-            }
-        }
-        
-        // progressive decode the image in coder queue
-        dispatch_async(self.coderQueue, ^{
-            UIImage *image = [self.progressiveCoder incrementallyDecodedImageWithData:imageData finished:finished];
-            if (image) {
-                NSString *key = [[SDWebImageManager sharedManager] cacheKeyForURL:self.request.URL];
-                image = [self scaledImageForKey:key image:image];
-                if (self.shouldDecompressImages) {
-                    image = [[SDWebImageCodersManager sharedInstance] decompressedImageWithImage:image data:&imageData options:@{SDWebImageCoderScaleDownLargeImagesKey: @(NO)}];
-                }
-                
-                // We do not keep the progressive decoding image even when `finished`=YES. Because they are for view rendering but not take full function from downloader options. And some coders implementation may not keep consistent between progressive decoding and normal decoding.
-                
-                [self callCompletionBlocksWithImage:image imageData:nil error:nil finished:NO];
-            }
-        });
-    }
-
-    for (SDWebImageDownloaderProgressBlock progressBlock in [self callbacksForKey:kProgressCallbackKey]) {
-        progressBlock(self.imageData.length, self.expectedSize, self.request.URL);
-    }
-}
-
-- (void)URLSession:(NSURLSession *)session
-          dataTask:(NSURLSessionDataTask *)dataTask
- willCacheResponse:(NSCachedURLResponse *)proposedResponse
- completionHandler:(void (^)(NSCachedURLResponse *cachedResponse))completionHandler {
-    
-    NSCachedURLResponse *cachedResponse = proposedResponse;
-
-    if (!(self.options & SDWebImageDownloaderUseNSURLCache)) {
-        // Prevents caching of responses
-        cachedResponse = nil;
-    }
-    if (completionHandler) {
-        completionHandler(cachedResponse);
-    }
-}
-
-#pragma mark NSURLSessionTaskDelegate
-
-- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error {
-    @synchronized(self) {
-        self.dataTask = nil;
-        __weak typeof(self) weakSelf = self;
-        dispatch_async(dispatch_get_main_queue(), ^{
-            [[NSNotificationCenter defaultCenter] postNotificationName:SDWebImageDownloadStopNotification object:weakSelf];
-            if (!error) {
-                [[NSNotificationCenter defaultCenter] postNotificationName:SDWebImageDownloadFinishNotification object:weakSelf];
-            }
-        });
-    }
-    
-    // make sure to call `[self done]` to mark operation as finished
-    if (error) {
-        [self callCompletionBlocksWithError:error];
-        [self done];
-    } else {
-        if ([self callbacksForKey:kCompletedCallbackKey].count > 0) {
-            /**
-             *  If you specified to use `NSURLCache`, then the response you get here is what you need.
-             */
-            __block NSData *imageData = [self.imageData copy];
-            if (imageData) {
-                /**  if you specified to only use cached data via `SDWebImageDownloaderIgnoreCachedResponse`,
-                 *  then we should check if the cached data is equal to image data
-                 */
-                if (self.options & SDWebImageDownloaderIgnoreCachedResponse && [self.cachedData isEqualToData:imageData]) {
-                    // call completion block with nil
-                    [self callCompletionBlocksWithImage:nil imageData:nil error:nil finished:YES];
-                    [self done];
-                } else {
-                    // decode the image in coder queue
-                    dispatch_async(self.coderQueue, ^{
-                        UIImage *image = [[SDWebImageCodersManager sharedInstance] decodedImageWithData:imageData];
-                        NSString *key = [[SDWebImageManager sharedManager] cacheKeyForURL:self.request.URL];
-                        image = [self scaledImageForKey:key image:image];
-                        
-                        BOOL shouldDecode = YES;
-                        // Do not force decoding animated GIFs and WebPs
-                        if (image.images) {
-                            shouldDecode = NO;
-                        } else {
-#ifdef SD_WEBP
-                            SDImageFormat imageFormat = [NSData sd_imageFormatForImageData:imageData];
-                            if (imageFormat == SDImageFormatWebP) {
-                                shouldDecode = NO;
-                            }
-#endif
-                        }
-                        
-                        if (shouldDecode) {
-                            if (self.shouldDecompressImages) {
-                                BOOL shouldScaleDown = self.options & SDWebImageDownloaderScaleDownLargeImages;
-                                image = [[SDWebImageCodersManager sharedInstance] decompressedImageWithImage:image data:&imageData options:@{SDWebImageCoderScaleDownLargeImagesKey: @(shouldScaleDown)}];
-                            }
-                        }
-                        CGSize imageSize = image.size;
-                        if (imageSize.width == 0 || imageSize.height == 0) {
-                            [self callCompletionBlocksWithError:[NSError errorWithDomain:SDWebImageErrorDomain code:0 userInfo:@{NSLocalizedDescriptionKey : @"Downloaded image has 0 pixels"}]];
-                        } else {
-                            [self callCompletionBlocksWithImage:image imageData:imageData error:nil finished:YES];
-                        }
-                        [self done];
-                    });
-                }
-            } else {
-                [self callCompletionBlocksWithError:[NSError errorWithDomain:SDWebImageErrorDomain code:0 userInfo:@{NSLocalizedDescriptionKey : @"Image data is nil"}]];
-                [self done];
-            }
-        } else {
-            [self done];
-        }
-    }
-}
-
-- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential *credential))completionHandler {
-    
-    NSURLSessionAuthChallengeDisposition disposition = NSURLSessionAuthChallengePerformDefaultHandling;
-    __block NSURLCredential *credential = nil;
-    
-    if ([challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust]) {
-        if (!(self.options & SDWebImageDownloaderAllowInvalidSSLCertificates)) {
-            disposition = NSURLSessionAuthChallengePerformDefaultHandling;
-        } else {
-            credential = [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust];
-            disposition = NSURLSessionAuthChallengeUseCredential;
-        }
-    } else {
-        if (challenge.previousFailureCount == 0) {
-            if (self.credential) {
-                credential = self.credential;
-                disposition = NSURLSessionAuthChallengeUseCredential;
-            } else {
-                disposition = NSURLSessionAuthChallengeCancelAuthenticationChallenge;
-            }
-        } else {
-            disposition = NSURLSessionAuthChallengeCancelAuthenticationChallenge;
-        }
-    }
-    
-    if (completionHandler) {
-        completionHandler(disposition, credential);
-    }
-}
-
-#pragma mark Helper methods
-- (nullable UIImage *)scaledImageForKey:(nullable NSString *)key image:(nullable UIImage *)image {
-    return SDScaledImageForKey(key, image);
-}
-
-- (BOOL)shouldContinueWhenAppEntersBackground {
-    return self.options & SDWebImageDownloaderContinueInBackground;
-}
-
-- (void)callCompletionBlocksWithError:(nullable NSError *)error {
-    [self callCompletionBlocksWithImage:nil imageData:nil error:error finished:YES];
-}
-
-- (void)callCompletionBlocksWithImage:(nullable UIImage *)image
-                            imageData:(nullable NSData *)imageData
-                                error:(nullable NSError *)error
-                             finished:(BOOL)finished {
-    NSArray<id> *completionBlocks = [self callbacksForKey:kCompletedCallbackKey];
-    dispatch_main_async_safe(^{
-        for (SDWebImageDownloaderCompletedBlock completedBlock in completionBlocks) {
-            completedBlock(image, imageData, error, finished);
-        }
-    });
-}
-
-@end
diff --git a/SDWebImage/SDWebImageGIFCoder.h b/SDWebImage/SDWebImageGIFCoder.h
deleted file mode 100644
index 30521f9e1..000000000
--- a/SDWebImage/SDWebImageGIFCoder.h
+++ /dev/null
@@ -1,23 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import <Foundation/Foundation.h>
-#import "SDWebImageCoder.h"
-
-/**
- Built in coder using ImageIO that supports GIF encoding/decoding
- @note `SDWebImageIOCoder` supports GIF but only as static (will use the 1st frame).
- @note Use `SDWebImageGIFCoder` for fully animated GIFs - less performant than `FLAnimatedImage`
- @note If you decide to make all `UIImageView`(including `FLAnimatedImageView`) instance support GIF. You should add this coder to `SDWebImageCodersManager` and make sure that it has a higher priority than `SDWebImageIOCoder`
- @note The recommended approach for animated GIFs is using `FLAnimatedImage`. It's more performant than `UIImageView` for GIF displaying
- */
-@interface SDWebImageGIFCoder : NSObject <SDWebImageCoder>
-
-+ (nonnull instancetype)sharedCoder;
-
-@end
diff --git a/SDWebImage/SDWebImageGIFCoder.m b/SDWebImage/SDWebImageGIFCoder.m
deleted file mode 100644
index e43b7735d..000000000
--- a/SDWebImage/SDWebImageGIFCoder.m
+++ /dev/null
@@ -1,184 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "SDWebImageGIFCoder.h"
-#import "NSImage+WebCache.h"
-#import <ImageIO/ImageIO.h>
-#import "NSData+ImageContentType.h"
-#import "UIImage+MultiFormat.h"
-#import "SDWebImageCoderHelper.h"
-#import "SDAnimatedImageRep.h"
-
-@implementation SDWebImageGIFCoder
-
-+ (instancetype)sharedCoder {
-    static SDWebImageGIFCoder *coder;
-    static dispatch_once_t onceToken;
-    dispatch_once(&onceToken, ^{
-        coder = [[SDWebImageGIFCoder alloc] init];
-    });
-    return coder;
-}
-
-#pragma mark - Decode
-- (BOOL)canDecodeFromData:(nullable NSData *)data {
-    return ([NSData sd_imageFormatForImageData:data] == SDImageFormatGIF);
-}
-
-- (UIImage *)decodedImageWithData:(NSData *)data {
-    if (!data) {
-        return nil;
-    }
-    
-#if SD_MAC
-    SDAnimatedImageRep *imageRep = [[SDAnimatedImageRep alloc] initWithData:data];
-    NSImage *animatedImage = [[NSImage alloc] initWithSize:imageRep.size];
-    [animatedImage addRepresentation:imageRep];
-    return animatedImage;
-#else
-    
-    CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef)data, NULL);
-    if (!source) {
-        return nil;
-    }
-    size_t count = CGImageSourceGetCount(source);
-    
-    UIImage *animatedImage;
-    
-    if (count <= 1) {
-        animatedImage = [[UIImage alloc] initWithData:data];
-    } else {
-        NSMutableArray<SDWebImageFrame *> *frames = [NSMutableArray array];
-        
-        for (size_t i = 0; i < count; i++) {
-            CGImageRef imageRef = CGImageSourceCreateImageAtIndex(source, i, NULL);
-            if (!imageRef) {
-                continue;
-            }
-            
-            float duration = [self sd_frameDurationAtIndex:i source:source];
-            UIImage *image = [[UIImage alloc] initWithCGImage:imageRef];
-            CGImageRelease(imageRef);
-            
-            SDWebImageFrame *frame = [SDWebImageFrame frameWithImage:image duration:duration];
-            [frames addObject:frame];
-        }
-        
-        NSUInteger loopCount = 1;
-        NSDictionary *imageProperties = (__bridge_transfer NSDictionary *)CGImageSourceCopyProperties(source, nil);
-        NSDictionary *gifProperties = [imageProperties valueForKey:(__bridge NSString *)kCGImagePropertyGIFDictionary];
-        if (gifProperties) {
-            NSNumber *gifLoopCount = [gifProperties valueForKey:(__bridge NSString *)kCGImagePropertyGIFLoopCount];
-            if (gifLoopCount != nil) {
-                loopCount = gifLoopCount.unsignedIntegerValue;
-            }
-        }
-        
-        animatedImage = [SDWebImageCoderHelper animatedImageWithFrames:frames];
-        animatedImage.sd_imageLoopCount = loopCount;
-        animatedImage.sd_imageFormat = SDImageFormatGIF;
-    }
-    
-    CFRelease(source);
-    
-    return animatedImage;
-#endif
-}
-
-- (float)sd_frameDurationAtIndex:(NSUInteger)index source:(CGImageSourceRef)source {
-    float frameDuration = 0.1f;
-    CFDictionaryRef cfFrameProperties = CGImageSourceCopyPropertiesAtIndex(source, index, nil);
-    if (!cfFrameProperties) {
-        return frameDuration;
-    }
-    NSDictionary *frameProperties = (__bridge NSDictionary *)cfFrameProperties;
-    NSDictionary *gifProperties = frameProperties[(NSString *)kCGImagePropertyGIFDictionary];
-    
-    NSNumber *delayTimeUnclampedProp = gifProperties[(NSString *)kCGImagePropertyGIFUnclampedDelayTime];
-    if (delayTimeUnclampedProp != nil) {
-        frameDuration = [delayTimeUnclampedProp floatValue];
-    } else {
-        NSNumber *delayTimeProp = gifProperties[(NSString *)kCGImagePropertyGIFDelayTime];
-        if (delayTimeProp != nil) {
-            frameDuration = [delayTimeProp floatValue];
-        }
-    }
-    
-    // Many annoying ads specify a 0 duration to make an image flash as quickly as possible.
-    // We follow Firefox's behavior and use a duration of 100 ms for any frames that specify
-    // a duration of <= 10 ms. See <rdar://problem/7689300> and <http://webkit.org/b/36082>
-    // for more information.
-    
-    if (frameDuration < 0.011f) {
-        frameDuration = 0.100f;
-    }
-    
-    CFRelease(cfFrameProperties);
-    return frameDuration;
-}
-
-- (UIImage *)decompressedImageWithImage:(UIImage *)image
-                                   data:(NSData *__autoreleasing  _Nullable *)data
-                                options:(nullable NSDictionary<NSString*, NSObject*>*)optionsDict {
-    // GIF do not decompress
-    return image;
-}
-
-#pragma mark - Encode
-- (BOOL)canEncodeToFormat:(SDImageFormat)format {
-    return (format == SDImageFormatGIF);
-}
-
-- (NSData *)encodedDataWithImage:(UIImage *)image format:(SDImageFormat)format {
-    if (!image) {
-        return nil;
-    }
-    
-    if (format != SDImageFormatGIF) {
-        return nil;
-    }
-    
-    NSMutableData *imageData = [NSMutableData data];
-    CFStringRef imageUTType = [NSData sd_UTTypeFromSDImageFormat:SDImageFormatGIF];
-    NSArray<SDWebImageFrame *> *frames = [SDWebImageCoderHelper framesFromAnimatedImage:image];
-    
-    // Create an image destination. GIF does not support EXIF image orientation
-    CGImageDestinationRef imageDestination = CGImageDestinationCreateWithData((__bridge CFMutableDataRef)imageData, imageUTType, frames.count, NULL);
-    if (!imageDestination) {
-        // Handle failure.
-        return nil;
-    }
-    if (frames.count == 0) {
-        // for static single GIF images
-        CGImageDestinationAddImage(imageDestination, image.CGImage, nil);
-    } else {
-        // for animated GIF images
-        NSUInteger loopCount = image.sd_imageLoopCount;
-        NSDictionary *gifProperties = @{(__bridge NSString *)kCGImagePropertyGIFDictionary: @{(__bridge NSString *)kCGImagePropertyGIFLoopCount : @(loopCount)}};
-        CGImageDestinationSetProperties(imageDestination, (__bridge CFDictionaryRef)gifProperties);
-        
-        for (size_t i = 0; i < frames.count; i++) {
-            SDWebImageFrame *frame = frames[i];
-            float frameDuration = frame.duration;
-            CGImageRef frameImageRef = frame.image.CGImage;
-            NSDictionary *frameProperties = @{(__bridge NSString *)kCGImagePropertyGIFDictionary : @{(__bridge NSString *)kCGImagePropertyGIFDelayTime : @(frameDuration)}};
-            CGImageDestinationAddImage(imageDestination, frameImageRef, (__bridge CFDictionaryRef)frameProperties);
-        }
-    }
-    // Finalize the destination.
-    if (CGImageDestinationFinalize(imageDestination) == NO) {
-        // Handle failure.
-        imageData = nil;
-    }
-    
-    CFRelease(imageDestination);
-    
-    return [imageData copy];
-}
-
-@end
diff --git a/SDWebImage/SDWebImageImageIOCoder.m b/SDWebImage/SDWebImageImageIOCoder.m
deleted file mode 100644
index 1d0238ea2..000000000
--- a/SDWebImage/SDWebImageImageIOCoder.m
+++ /dev/null
@@ -1,510 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "SDWebImageImageIOCoder.h"
-#import "SDWebImageCoderHelper.h"
-#import "NSImage+WebCache.h"
-#import <ImageIO/ImageIO.h>
-#import "NSData+ImageContentType.h"
-#import "UIImage+MultiFormat.h"
-
-#if SD_UIKIT || SD_WATCH
-static const size_t kBytesPerPixel = 4;
-static const size_t kBitsPerComponent = 8;
-
-/*
- * Defines the maximum size in MB of the decoded image when the flag `SDWebImageScaleDownLargeImages` is set
- * Suggested value for iPad1 and iPhone 3GS: 60.
- * Suggested value for iPad2 and iPhone 4: 120.
- * Suggested value for iPhone 3G and iPod 2 and earlier devices: 30.
- */
-static const CGFloat kDestImageSizeMB = 60.0f;
-
-/*
- * Defines the maximum size in MB of a tile used to decode image when the flag `SDWebImageScaleDownLargeImages` is set
- * Suggested value for iPad1 and iPhone 3GS: 20.
- * Suggested value for iPad2 and iPhone 4: 40.
- * Suggested value for iPhone 3G and iPod 2 and earlier devices: 10.
- */
-static const CGFloat kSourceImageTileSizeMB = 20.0f;
-
-static const CGFloat kBytesPerMB = 1024.0f * 1024.0f;
-static const CGFloat kPixelsPerMB = kBytesPerMB / kBytesPerPixel;
-static const CGFloat kDestTotalPixels = kDestImageSizeMB * kPixelsPerMB;
-static const CGFloat kTileTotalPixels = kSourceImageTileSizeMB * kPixelsPerMB;
-
-static const CGFloat kDestSeemOverlap = 2.0f;   // the numbers of pixels to overlap the seems where tiles meet.
-#endif
-
-@implementation SDWebImageImageIOCoder {
-        size_t _width, _height;
-#if SD_UIKIT || SD_WATCH
-        UIImageOrientation _orientation;
-#endif
-        CGImageSourceRef _imageSource;
-}
-
-- (void)dealloc {
-    if (_imageSource) {
-        CFRelease(_imageSource);
-        _imageSource = NULL;
-    }
-}
-
-+ (instancetype)sharedCoder {
-    static SDWebImageImageIOCoder *coder;
-    static dispatch_once_t onceToken;
-    dispatch_once(&onceToken, ^{
-        coder = [[SDWebImageImageIOCoder alloc] init];
-    });
-    return coder;
-}
-
-#pragma mark - Decode
-- (BOOL)canDecodeFromData:(nullable NSData *)data {
-    switch ([NSData sd_imageFormatForImageData:data]) {
-        case SDImageFormatWebP:
-            // Do not support WebP decoding
-            return NO;
-        case SDImageFormatHEIC:
-            // Check HEIC decoding compatibility
-            return [[self class] canDecodeFromHEICFormat];
-        default:
-            return YES;
-    }
-}
-
-- (BOOL)canIncrementallyDecodeFromData:(NSData *)data {
-    switch ([NSData sd_imageFormatForImageData:data]) {
-        case SDImageFormatWebP:
-            // Do not support WebP progressive decoding
-            return NO;
-        case SDImageFormatHEIC:
-            // Check HEIC decoding compatibility
-            return [[self class] canDecodeFromHEICFormat];
-        default:
-            return YES;
-    }
-}
-
-- (UIImage *)decodedImageWithData:(NSData *)data {
-    if (!data) {
-        return nil;
-    }
-    
-    UIImage *image = [[UIImage alloc] initWithData:data];
-    image.sd_imageFormat = [NSData sd_imageFormatForImageData:data];
-    
-    return image;
-}
-
-- (UIImage *)incrementallyDecodedImageWithData:(NSData *)data finished:(BOOL)finished {
-    if (!_imageSource) {
-        _imageSource = CGImageSourceCreateIncremental(NULL);
-    }
-    UIImage *image;
-    
-    // The following code is from http://www.cocoaintheshell.com/2011/05/progressive-images-download-imageio/
-    // Thanks to the author @Nyx0uf
-    
-    // Update the data source, we must pass ALL the data, not just the new bytes
-    CGImageSourceUpdateData(_imageSource, (__bridge CFDataRef)data, finished);
-    
-    if (_width + _height == 0) {
-        CFDictionaryRef properties = CGImageSourceCopyPropertiesAtIndex(_imageSource, 0, NULL);
-        if (properties) {
-            NSInteger orientationValue = 1;
-            CFTypeRef val = CFDictionaryGetValue(properties, kCGImagePropertyPixelHeight);
-            if (val) CFNumberGetValue(val, kCFNumberLongType, &_height);
-            val = CFDictionaryGetValue(properties, kCGImagePropertyPixelWidth);
-            if (val) CFNumberGetValue(val, kCFNumberLongType, &_width);
-            val = CFDictionaryGetValue(properties, kCGImagePropertyOrientation);
-            if (val) CFNumberGetValue(val, kCFNumberNSIntegerType, &orientationValue);
-            CFRelease(properties);
-            
-            // When we draw to Core Graphics, we lose orientation information,
-            // which means the image below born of initWithCGIImage will be
-            // oriented incorrectly sometimes. (Unlike the image born of initWithData
-            // in didCompleteWithError.) So save it here and pass it on later.
-#if SD_UIKIT || SD_WATCH
-            _orientation = [SDWebImageCoderHelper imageOrientationFromEXIFOrientation:orientationValue];
-#endif
-        }
-    }
-    
-    if (_width + _height > 0) {
-        // Create the image
-        CGImageRef partialImageRef = CGImageSourceCreateImageAtIndex(_imageSource, 0, NULL);
-        
-        if (partialImageRef) {
-#if SD_UIKIT || SD_WATCH
-            image = [[UIImage alloc] initWithCGImage:partialImageRef scale:1 orientation:_orientation];
-#elif SD_MAC
-            image = [[UIImage alloc] initWithCGImage:partialImageRef size:NSZeroSize];
-#endif
-            CGImageRelease(partialImageRef);
-            image.sd_imageFormat = [NSData sd_imageFormatForImageData:data];
-        }
-    }
-    
-    if (finished) {
-        if (_imageSource) {
-            CFRelease(_imageSource);
-            _imageSource = NULL;
-        }
-    }
-    
-    return image;
-}
-
-- (UIImage *)decompressedImageWithImage:(UIImage *)image
-                                   data:(NSData *__autoreleasing  _Nullable *)data
-                                options:(nullable NSDictionary<NSString*, NSObject*>*)optionsDict {
-#if SD_MAC
-    return image;
-#endif
-#if SD_UIKIT || SD_WATCH
-    BOOL shouldScaleDown = NO;
-    if (optionsDict != nil) {
-        NSNumber *scaleDownLargeImagesOption = nil;
-        if ([optionsDict[SDWebImageCoderScaleDownLargeImagesKey] isKindOfClass:[NSNumber class]]) {
-            scaleDownLargeImagesOption = (NSNumber *)optionsDict[SDWebImageCoderScaleDownLargeImagesKey];
-        }
-        if (scaleDownLargeImagesOption != nil) {
-            shouldScaleDown = [scaleDownLargeImagesOption boolValue];
-        }
-    }
-    if (!shouldScaleDown) {
-        return [self sd_decompressedImageWithImage:image];
-    } else {
-        UIImage *scaledDownImage = [self sd_decompressedAndScaledDownImageWithImage:image];
-        if (scaledDownImage && !CGSizeEqualToSize(scaledDownImage.size, image.size)) {
-            // if the image is scaled down, need to modify the data pointer as well
-            SDImageFormat format = [NSData sd_imageFormatForImageData:*data];
-            NSData *imageData = [self encodedDataWithImage:scaledDownImage format:format];
-            if (imageData) {
-                *data = imageData;
-            }
-        }
-        return scaledDownImage;
-    }
-#endif
-}
-
-#if SD_UIKIT || SD_WATCH
-- (nullable UIImage *)sd_decompressedImageWithImage:(nullable UIImage *)image {
-    if (![[self class] shouldDecodeImage:image]) {
-        return image;
-    }
-    
-    // autorelease the bitmap context and all vars to help system to free memory when there are memory warning.
-    // on iOS7, do not forget to call [[SDImageCache sharedImageCache] clearMemory];
-    @autoreleasepool{
-        
-        CGImageRef imageRef = image.CGImage;
-        // device color space
-        CGColorSpaceRef colorspaceRef = SDCGColorSpaceGetDeviceRGB();
-        BOOL hasAlpha = SDCGImageRefContainsAlpha(imageRef);
-        // iOS display alpha info (BRGA8888/BGRX8888)
-        CGBitmapInfo bitmapInfo = kCGBitmapByteOrder32Host;
-        bitmapInfo |= hasAlpha ? kCGImageAlphaPremultipliedFirst : kCGImageAlphaNoneSkipFirst;
-        
-        size_t width = CGImageGetWidth(imageRef);
-        size_t height = CGImageGetHeight(imageRef);
-        
-        // kCGImageAlphaNone is not supported in CGBitmapContextCreate.
-        // Since the original image here has no alpha info, use kCGImageAlphaNoneSkipLast
-        // to create bitmap graphics contexts without alpha info.
-        CGContextRef context = CGBitmapContextCreate(NULL,
-                                                     width,
-                                                     height,
-                                                     kBitsPerComponent,
-                                                     0,
-                                                     colorspaceRef,
-                                                     bitmapInfo);
-        if (context == NULL) {
-            return image;
-        }
-        
-        // Draw the image into the context and retrieve the new bitmap image without alpha
-        CGContextDrawImage(context, CGRectMake(0, 0, width, height), imageRef);
-        CGImageRef imageRefWithoutAlpha = CGBitmapContextCreateImage(context);
-        UIImage *imageWithoutAlpha = [[UIImage alloc] initWithCGImage:imageRefWithoutAlpha scale:image.scale orientation:image.imageOrientation];
-        CGContextRelease(context);
-        CGImageRelease(imageRefWithoutAlpha);
-        
-        return imageWithoutAlpha;
-    }
-}
-
-- (nullable UIImage *)sd_decompressedAndScaledDownImageWithImage:(nullable UIImage *)image {
-    if (![[self class] shouldDecodeImage:image]) {
-        return image;
-    }
-    
-    if (![[self class] shouldScaleDownImage:image]) {
-        return [self sd_decompressedImageWithImage:image];
-    }
-    
-    CGContextRef destContext;
-    
-    // autorelease the bitmap context and all vars to help system to free memory when there are memory warning.
-    // on iOS7, do not forget to call [[SDImageCache sharedImageCache] clearMemory];
-    @autoreleasepool {
-        CGImageRef sourceImageRef = image.CGImage;
-        
-        CGSize sourceResolution = CGSizeZero;
-        sourceResolution.width = CGImageGetWidth(sourceImageRef);
-        sourceResolution.height = CGImageGetHeight(sourceImageRef);
-        float sourceTotalPixels = sourceResolution.width * sourceResolution.height;
-        // Determine the scale ratio to apply to the input image
-        // that results in an output image of the defined size.
-        // see kDestImageSizeMB, and how it relates to destTotalPixels.
-        float imageScale = kDestTotalPixels / sourceTotalPixels;
-        CGSize destResolution = CGSizeZero;
-        destResolution.width = (int)(sourceResolution.width*imageScale);
-        destResolution.height = (int)(sourceResolution.height*imageScale);
-        
-        // device color space
-        CGColorSpaceRef colorspaceRef = SDCGColorSpaceGetDeviceRGB();
-        BOOL hasAlpha = SDCGImageRefContainsAlpha(sourceImageRef);
-        // iOS display alpha info (BGRA8888/BGRX8888)
-        CGBitmapInfo bitmapInfo = kCGBitmapByteOrder32Host;
-        bitmapInfo |= hasAlpha ? kCGImageAlphaPremultipliedFirst : kCGImageAlphaNoneSkipFirst;
-        
-        // kCGImageAlphaNone is not supported in CGBitmapContextCreate.
-        // Since the original image here has no alpha info, use kCGImageAlphaNoneSkipLast
-        // to create bitmap graphics contexts without alpha info.
-        destContext = CGBitmapContextCreate(NULL,
-                                            destResolution.width,
-                                            destResolution.height,
-                                            kBitsPerComponent,
-                                            0,
-                                            colorspaceRef,
-                                            bitmapInfo);
-        
-        if (destContext == NULL) {
-            return image;
-        }
-        CGContextSetInterpolationQuality(destContext, kCGInterpolationHigh);
-        
-        // Now define the size of the rectangle to be used for the
-        // incremental blits from the input image to the output image.
-        // we use a source tile width equal to the width of the source
-        // image due to the way that iOS retrieves image data from disk.
-        // iOS must decode an image from disk in full width 'bands', even
-        // if current graphics context is clipped to a subrect within that
-        // band. Therefore we fully utilize all of the pixel data that results
-        // from a decoding opertion by achnoring our tile size to the full
-        // width of the input image.
-        CGRect sourceTile = CGRectZero;
-        sourceTile.size.width = sourceResolution.width;
-        // The source tile height is dynamic. Since we specified the size
-        // of the source tile in MB, see how many rows of pixels high it
-        // can be given the input image width.
-        sourceTile.size.height = (int)(kTileTotalPixels / sourceTile.size.width );
-        sourceTile.origin.x = 0.0f;
-        // The output tile is the same proportions as the input tile, but
-        // scaled to image scale.
-        CGRect destTile;
-        destTile.size.width = destResolution.width;
-        destTile.size.height = sourceTile.size.height * imageScale;
-        destTile.origin.x = 0.0f;
-        // The source seem overlap is proportionate to the destination seem overlap.
-        // this is the amount of pixels to overlap each tile as we assemble the ouput image.
-        float sourceSeemOverlap = (int)((kDestSeemOverlap/destResolution.height)*sourceResolution.height);
-        CGImageRef sourceTileImageRef;
-        // calculate the number of read/write operations required to assemble the
-        // output image.
-        int iterations = (int)( sourceResolution.height / sourceTile.size.height );
-        // If tile height doesn't divide the image height evenly, add another iteration
-        // to account for the remaining pixels.
-        int remainder = (int)sourceResolution.height % (int)sourceTile.size.height;
-        if(remainder) {
-            iterations++;
-        }
-        // Add seem overlaps to the tiles, but save the original tile height for y coordinate calculations.
-        float sourceTileHeightMinusOverlap = sourceTile.size.height;
-        sourceTile.size.height += sourceSeemOverlap;
-        destTile.size.height += kDestSeemOverlap;
-        for( int y = 0; y < iterations; ++y ) {
-            @autoreleasepool {
-                sourceTile.origin.y = y * sourceTileHeightMinusOverlap + sourceSeemOverlap;
-                destTile.origin.y = destResolution.height - (( y + 1 ) * sourceTileHeightMinusOverlap * imageScale + kDestSeemOverlap);
-                sourceTileImageRef = CGImageCreateWithImageInRect( sourceImageRef, sourceTile );
-                if( y == iterations - 1 && remainder ) {
-                    float dify = destTile.size.height;
-                    destTile.size.height = CGImageGetHeight( sourceTileImageRef ) * imageScale;
-                    dify -= destTile.size.height;
-                    destTile.origin.y += dify;
-                }
-                CGContextDrawImage( destContext, destTile, sourceTileImageRef );
-                CGImageRelease( sourceTileImageRef );
-            }
-        }
-        
-        CGImageRef destImageRef = CGBitmapContextCreateImage(destContext);
-        CGContextRelease(destContext);
-        if (destImageRef == NULL) {
-            return image;
-        }
-        UIImage *destImage = [[UIImage alloc] initWithCGImage:destImageRef scale:image.scale orientation:image.imageOrientation];
-        CGImageRelease(destImageRef);
-        if (destImage == nil) {
-            return image;
-        }
-        return destImage;
-    }
-}
-#endif
-
-#pragma mark - Encode
-- (BOOL)canEncodeToFormat:(SDImageFormat)format {
-    switch (format) {
-        case SDImageFormatWebP:
-            // Do not support WebP encoding
-            return NO;
-        case SDImageFormatHEIC:
-            // Check HEIC encoding compatibility
-            return [[self class] canEncodeToHEICFormat];
-        default:
-            return YES;
-    }
-}
-
-- (NSData *)encodedDataWithImage:(UIImage *)image format:(SDImageFormat)format {
-    if (!image) {
-        return nil;
-    }
-    
-    if (format == SDImageFormatUndefined) {
-        BOOL hasAlpha = SDCGImageRefContainsAlpha(image.CGImage);
-        if (hasAlpha) {
-            format = SDImageFormatPNG;
-        } else {
-            format = SDImageFormatJPEG;
-        }
-    }
-    
-    NSMutableData *imageData = [NSMutableData data];
-    CFStringRef imageUTType = [NSData sd_UTTypeFromSDImageFormat:format];
-    
-    // Create an image destination.
-    CGImageDestinationRef imageDestination = CGImageDestinationCreateWithData((__bridge CFMutableDataRef)imageData, imageUTType, 1, NULL);
-    if (!imageDestination) {
-        // Handle failure.
-        return nil;
-    }
-    
-    NSMutableDictionary *properties = [NSMutableDictionary dictionary];
-#if SD_UIKIT || SD_WATCH
-    NSInteger exifOrientation = [SDWebImageCoderHelper exifOrientationFromImageOrientation:image.imageOrientation];
-    [properties setValue:@(exifOrientation) forKey:(__bridge NSString *)kCGImagePropertyOrientation];
-#endif
-    
-    // Add your image to the destination.
-    CGImageDestinationAddImage(imageDestination, image.CGImage, (__bridge CFDictionaryRef)properties);
-    
-    // Finalize the destination.
-    if (CGImageDestinationFinalize(imageDestination) == NO) {
-        // Handle failure.
-        imageData = nil;
-    }
-    
-    CFRelease(imageDestination);
-    
-    return [imageData copy];
-}
-
-#pragma mark - Helper
-+ (BOOL)shouldDecodeImage:(nullable UIImage *)image {
-    // Prevent "CGBitmapContextCreateImage: invalid context 0x0" error
-    if (image == nil) {
-        return NO;
-    }
-    
-    // do not decode animated images
-    if (image.images != nil) {
-        return NO;
-    }
-    
-    return YES;
-}
-
-+ (BOOL)canDecodeFromHEICFormat {
-    static BOOL canDecode = NO;
-    static dispatch_once_t onceToken;
-    dispatch_once(&onceToken, ^{
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wunguarded-availability"
-#if TARGET_OS_SIMULATOR || SD_WATCH
-        canDecode = NO;
-#elif SD_MAC
-        NSProcessInfo *processInfo = [NSProcessInfo processInfo];
-        if ([processInfo respondsToSelector:@selector(operatingSystemVersion)]) {
-            // macOS 10.13+
-            canDecode = processInfo.operatingSystemVersion.minorVersion >= 13;
-        } else {
-            canDecode = NO;
-        }
-#elif SD_UIKIT
-        NSProcessInfo *processInfo = [NSProcessInfo processInfo];
-        if ([processInfo respondsToSelector:@selector(operatingSystemVersion)]) {
-            // iOS 11+ && tvOS 11+
-            canDecode = processInfo.operatingSystemVersion.majorVersion >= 11;
-        } else {
-            canDecode = NO;
-        }
-#endif
-#pragma clang diagnostic pop
-    });
-    return canDecode;
-}
-
-+ (BOOL)canEncodeToHEICFormat {
-    static BOOL canEncode = NO;
-    static dispatch_once_t onceToken;
-    dispatch_once(&onceToken, ^{
-        NSMutableData *imageData = [NSMutableData data];
-        CFStringRef imageUTType = [NSData sd_UTTypeFromSDImageFormat:SDImageFormatHEIC];
-        
-        // Create an image destination.
-        CGImageDestinationRef imageDestination = CGImageDestinationCreateWithData((__bridge CFMutableDataRef)imageData, imageUTType, 1, NULL);
-        if (!imageDestination) {
-            // Can't encode to HEIC
-            canEncode = NO;
-        } else {
-            // Can encode to HEIC
-            CFRelease(imageDestination);
-            canEncode = YES;
-        }
-    });
-    return canEncode;
-}
-
-#if SD_UIKIT || SD_WATCH
-+ (BOOL)shouldScaleDownImage:(nonnull UIImage *)image {
-    BOOL shouldScaleDown = YES;
-    
-    CGImageRef sourceImageRef = image.CGImage;
-    CGSize sourceResolution = CGSizeZero;
-    sourceResolution.width = CGImageGetWidth(sourceImageRef);
-    sourceResolution.height = CGImageGetHeight(sourceImageRef);
-    float sourceTotalPixels = sourceResolution.width * sourceResolution.height;
-    float imageScale = kDestTotalPixels / sourceTotalPixels;
-    if (imageScale < 1) {
-        shouldScaleDown = YES;
-    } else {
-        shouldScaleDown = NO;
-    }
-    
-    return shouldScaleDown;
-}
-#endif
-
-@end
diff --git a/SDWebImage/SDWebImageManager.h b/SDWebImage/SDWebImageManager.h
deleted file mode 100644
index 916802152..000000000
--- a/SDWebImage/SDWebImageManager.h
+++ /dev/null
@@ -1,328 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "SDWebImageCompat.h"
-#import "SDWebImageOperation.h"
-#import "SDWebImageDownloader.h"
-#import "SDImageCache.h"
-
-typedef NS_OPTIONS(NSUInteger, SDWebImageOptions) {
-    /**
-     * By default, when a URL fail to be downloaded, the URL is blacklisted so the library won't keep trying.
-     * This flag disable this blacklisting.
-     */
-    SDWebImageRetryFailed = 1 << 0,
-
-    /**
-     * By default, image downloads are started during UI interactions, this flags disable this feature,
-     * leading to delayed download on UIScrollView deceleration for instance.
-     */
-    SDWebImageLowPriority = 1 << 1,
-
-    /**
-     * This flag disables on-disk caching after the download finished, only cache in memory
-     */
-    SDWebImageCacheMemoryOnly = 1 << 2,
-
-    /**
-     * This flag enables progressive download, the image is displayed progressively during download as a browser would do.
-     * By default, the image is only displayed once completely downloaded.
-     */
-    SDWebImageProgressiveDownload = 1 << 3,
-
-    /**
-     * Even if the image is cached, respect the HTTP response cache control, and refresh the image from remote location if needed.
-     * The disk caching will be handled by NSURLCache instead of SDWebImage leading to slight performance degradation.
-     * This option helps deal with images changing behind the same request URL, e.g. Facebook graph api profile pics.
-     * If a cached image is refreshed, the completion block is called once with the cached image and again with the final image.
-     *
-     * Use this flag only if you can't make your URLs static with embedded cache busting parameter.
-     */
-    SDWebImageRefreshCached = 1 << 4,
-
-    /**
-     * In iOS 4+, continue the download of the image if the app goes to background. This is achieved by asking the system for
-     * extra time in background to let the request finish. If the background task expires the operation will be cancelled.
-     */
-    SDWebImageContinueInBackground = 1 << 5,
-
-    /**
-     * Handles cookies stored in NSHTTPCookieStore by setting
-     * NSMutableURLRequest.HTTPShouldHandleCookies = YES;
-     */
-    SDWebImageHandleCookies = 1 << 6,
-
-    /**
-     * Enable to allow untrusted SSL certificates.
-     * Useful for testing purposes. Use with caution in production.
-     */
-    SDWebImageAllowInvalidSSLCertificates = 1 << 7,
-
-    /**
-     * By default, images are loaded in the order in which they were queued. This flag moves them to
-     * the front of the queue.
-     */
-    SDWebImageHighPriority = 1 << 8,
-    
-    /**
-     * By default, placeholder images are loaded while the image is loading. This flag will delay the loading
-     * of the placeholder image until after the image has finished loading.
-     */
-    SDWebImageDelayPlaceholder = 1 << 9,
-
-    /**
-     * We usually don't call transformDownloadedImage delegate method on animated images,
-     * as most transformation code would mangle it.
-     * Use this flag to transform them anyway.
-     */
-    SDWebImageTransformAnimatedImage = 1 << 10,
-    
-    /**
-     * By default, image is added to the imageView after download. But in some cases, we want to
-     * have the hand before setting the image (apply a filter or add it with cross-fade animation for instance)
-     * Use this flag if you want to manually set the image in the completion when success
-     */
-    SDWebImageAvoidAutoSetImage = 1 << 11,
-    
-    /**
-     * By default, images are decoded respecting their original size. On iOS, this flag will scale down the
-     * images to a size compatible with the constrained memory of devices.
-     * If `SDWebImageProgressiveDownload` flag is set the scale down is deactivated.
-     */
-    SDWebImageScaleDownLargeImages = 1 << 12,
-    
-    /**
-     * By default, we do not query disk data when the image is cached in memory. This mask can force to query disk data at the same time.
-     * This flag is recommend to be used with `SDWebImageQueryDiskSync` to ensure the image is loaded in the same runloop.
-     */
-    SDWebImageQueryDataWhenInMemory = 1 << 13,
-    
-    /**
-     * By default, we query the memory cache synchronously, disk cache asynchronously. This mask can force to query disk cache synchronously to ensure that image is loaded in the same runloop.
-     * This flag can avoid flashing during cell reuse if you disable memory cache or in some other cases.
-     */
-    SDWebImageQueryDiskSync = 1 << 14,
-    
-    /**
-     * By default, when the cache missed, the image is download from the network. This flag can prevent network to load from cache only.
-     */
-    SDWebImageFromCacheOnly = 1 << 15,
-    /**
-     * By default, when you use `SDWebImageTransition` to do some view transition after the image load finished, this transition is only applied for image download from the network. This mask can force to apply view transition for memory and disk cache as well.
-     */
-    SDWebImageForceTransition = 1 << 16
-};
-
-typedef void(^SDExternalCompletionBlock)(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL);
-
-typedef void(^SDInternalCompletionBlock)(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL);
-
-typedef NSString * _Nullable(^SDWebImageCacheKeyFilterBlock)(NSURL * _Nullable url);
-
-typedef NSData * _Nullable(^SDWebImageCacheSerializerBlock)(UIImage * _Nonnull image, NSData * _Nullable data, NSURL * _Nullable imageURL);
-
-
-@class SDWebImageManager;
-
-@protocol SDWebImageManagerDelegate <NSObject>
-
-@optional
-
-/**
- * Controls which image should be downloaded when the image is not found in the cache.
- *
- * @param imageManager The current `SDWebImageManager`
- * @param imageURL     The url of the image to be downloaded
- *
- * @return Return NO to prevent the downloading of the image on cache misses. If not implemented, YES is implied.
- */
-- (BOOL)imageManager:(nonnull SDWebImageManager *)imageManager shouldDownloadImageForURL:(nullable NSURL *)imageURL;
-
-/**
- * Controls the complicated logic to mark as failed URLs when download error occur.
- * If the delegate implement this method, we will not use the built-in way to mark URL as failed based on error code;
- @param imageManager The current `SDWebImageManager`
- @param imageURL The url of the image
- @param error The download error for the url
- @return Whether to block this url or not. Return YES to mark this URL as failed.
- */
-- (BOOL)imageManager:(nonnull SDWebImageManager *)imageManager shouldBlockFailedURL:(nonnull NSURL *)imageURL withError:(nonnull NSError *)error;
-
-/**
- * Allows to transform the image immediately after it has been downloaded and just before to cache it on disk and memory.
- * NOTE: This method is called from a global queue in order to not to block the main thread.
- *
- * @param imageManager The current `SDWebImageManager`
- * @param image        The image to transform
- * @param imageURL     The url of the image to transform
- *
- * @return The transformed image object.
- */
-- (nullable UIImage *)imageManager:(nonnull SDWebImageManager *)imageManager transformDownloadedImage:(nullable UIImage *)image withURL:(nullable NSURL *)imageURL;
-
-@end
-
-/**
- * The SDWebImageManager is the class behind the UIImageView+WebCache category and likes.
- * It ties the asynchronous downloader (SDWebImageDownloader) with the image cache store (SDImageCache).
- * You can use this class directly to benefit from web image downloading with caching in another context than
- * a UIView.
- *
- * Here is a simple example of how to use SDWebImageManager:
- *
- * @code
-
-SDWebImageManager *manager = [SDWebImageManager sharedManager];
-[manager loadImageWithURL:imageURL
-                  options:0
-                 progress:nil
-                completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {
-                    if (image) {
-                        // do something with image
-                    }
-                }];
-
- * @endcode
- */
-@interface SDWebImageManager : NSObject
-
-@property (weak, nonatomic, nullable) id <SDWebImageManagerDelegate> delegate;
-
-@property (strong, nonatomic, readonly, nullable) SDImageCache *imageCache;
-@property (strong, nonatomic, readonly, nullable) SDWebImageDownloader *imageDownloader;
-
-/**
- * The cache filter is a block used each time SDWebImageManager need to convert an URL into a cache key. This can
- * be used to remove dynamic part of an image URL.
- *
- * The following example sets a filter in the application delegate that will remove any query-string from the
- * URL before to use it as a cache key:
- *
- * @code
-
-SDWebImageManager.sharedManager.cacheKeyFilter = ^(NSURL * _Nullable url) {
-    url = [[NSURL alloc] initWithScheme:url.scheme host:url.host path:url.path];
-    return [url absoluteString];
-};
-
- * @endcode
- */
-@property (nonatomic, copy, nullable) SDWebImageCacheKeyFilterBlock cacheKeyFilter;
-
-/**
- * The cache serializer is a block used to convert the decoded image, the source downloaded data, to the actual data used for storing to the disk cache. If you return nil, means to generate the data from the image instance, see `SDImageCache`.
- * For example, if you are using WebP images and facing the slow decoding time issue when later retriving from disk cache again. You can try to encode the decoded image to JPEG/PNG format to disk cache instead of source downloaded data.
- * @note The `image` arg is nonnull, but when you also provide a image transformer and the image is transformed, the `data` arg may be nil, take attention to this case.
- * @note This method is called from a global queue in order to not to block the main thread.
- * @code
- SDWebImageManager.sharedManager.cacheSerializer = ^NSData * _Nullable(UIImage * _Nonnull image, NSData * _Nullable data, NSURL * _Nullable imageURL) {
-    SDImageFormat format = [NSData sd_imageFormatForImageData:data];
-    switch (format) {
-        case SDImageFormatWebP:
-            return image.images ? data : nil;
-        default:
-            return data;
-    }
- };
- * @endcode
- * The default value is nil. Means we just store the source downloaded data to disk cache.
- */
-@property (nonatomic, copy, nullable) SDWebImageCacheSerializerBlock cacheSerializer;
-
-/**
- * Returns global SDWebImageManager instance.
- *
- * @return SDWebImageManager shared instance
- */
-+ (nonnull instancetype)sharedManager;
-
-/**
- * Allows to specify instance of cache and image downloader used with image manager.
- * @return new instance of `SDWebImageManager` with specified cache and downloader.
- */
-- (nonnull instancetype)initWithCache:(nonnull SDImageCache *)cache downloader:(nonnull SDWebImageDownloader *)downloader NS_DESIGNATED_INITIALIZER;
-
-/**
- * Downloads the image at the given URL if not present in cache or return the cached version otherwise.
- *
- * @param url            The URL to the image
- * @param options        A mask to specify options to use for this request
- * @param progressBlock  A block called while image is downloading
- *                       @note the progress block is executed on a background queue
- * @param completedBlock A block called when operation has been completed.
- *
- *   This parameter is required.
- * 
- *   This block has no return value and takes the requested UIImage as first parameter and the NSData representation as second parameter.
- *   In case of error the image parameter is nil and the third parameter may contain an NSError.
- *
- *   The forth parameter is an `SDImageCacheType` enum indicating if the image was retrieved from the local cache
- *   or from the memory cache or from the network.
- *
- *   The fith parameter is set to NO when the SDWebImageProgressiveDownload option is used and the image is
- *   downloading. This block is thus called repeatedly with a partial image. When image is fully downloaded, the
- *   block is called a last time with the full image and the last parameter set to YES.
- *
- *   The last parameter is the original image URL
- *
- * @return Returns an NSObject conforming to SDWebImageOperation. Should be an instance of SDWebImageDownloaderOperation
- */
-- (nullable id <SDWebImageOperation>)loadImageWithURL:(nullable NSURL *)url
-                                              options:(SDWebImageOptions)options
-                                             progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
-                                            completed:(nullable SDInternalCompletionBlock)completedBlock;
-
-/**
- * Saves image to cache for given URL
- *
- * @param image The image to cache
- * @param url   The URL to the image
- *
- */
-
-- (void)saveImageToCache:(nullable UIImage *)image forURL:(nullable NSURL *)url;
-
-/**
- * Cancel all current operations
- */
-- (void)cancelAll;
-
-/**
- * Check one or more operations running
- */
-- (BOOL)isRunning;
-
-/**
- *  Async check if image has already been cached
- *
- *  @param url              image url
- *  @param completionBlock  the block to be executed when the check is finished
- *  
- *  @note the completion block is always executed on the main queue
- */
-- (void)cachedImageExistsForURL:(nullable NSURL *)url
-                     completion:(nullable SDWebImageCheckCacheCompletionBlock)completionBlock;
-
-/**
- *  Async check if image has already been cached on disk only
- *
- *  @param url              image url
- *  @param completionBlock  the block to be executed when the check is finished
- *
- *  @note the completion block is always executed on the main queue
- */
-- (void)diskImageExistsForURL:(nullable NSURL *)url
-                   completion:(nullable SDWebImageCheckCacheCompletionBlock)completionBlock;
-
-
-/**
- *Return the cache key for a given URL
- */
-- (nullable NSString *)cacheKeyForURL:(nullable NSURL *)url;
-
-@end
diff --git a/SDWebImage/SDWebImageManager.m b/SDWebImage/SDWebImageManager.m
deleted file mode 100644
index 24da020e5..000000000
--- a/SDWebImage/SDWebImageManager.m
+++ /dev/null
@@ -1,366 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "SDWebImageManager.h"
-#import "NSImage+WebCache.h"
-#import <objc/message.h>
-
-#define LOCK(lock) dispatch_semaphore_wait(lock, DISPATCH_TIME_FOREVER);
-#define UNLOCK(lock) dispatch_semaphore_signal(lock);
-
-@interface SDWebImageCombinedOperation : NSObject <SDWebImageOperation>
-
-@property (assign, nonatomic, getter = isCancelled) BOOL cancelled;
-@property (strong, nonatomic, nullable) SDWebImageDownloadToken *downloadToken;
-@property (strong, nonatomic, nullable) NSOperation *cacheOperation;
-@property (weak, nonatomic, nullable) SDWebImageManager *manager;
-
-@end
-
-@interface SDWebImageManager ()
-
-@property (strong, nonatomic, readwrite, nonnull) SDImageCache *imageCache;
-@property (strong, nonatomic, readwrite, nonnull) SDWebImageDownloader *imageDownloader;
-@property (strong, nonatomic, nonnull) NSMutableSet<NSURL *> *failedURLs;
-@property (strong, nonatomic, nonnull) dispatch_semaphore_t failedURLsLock; // a lock to keep the access to `failedURLs` thread-safe
-@property (strong, nonatomic, nonnull) NSMutableSet<SDWebImageCombinedOperation *> *runningOperations;
-@property (strong, nonatomic, nonnull) dispatch_semaphore_t runningOperationsLock; // a lock to keep the access to `runningOperations` thread-safe
-
-@end
-
-@implementation SDWebImageManager
-
-+ (nonnull instancetype)sharedManager {
-    static dispatch_once_t once;
-    static id instance;
-    dispatch_once(&once, ^{
-        instance = [self new];
-    });
-    return instance;
-}
-
-- (nonnull instancetype)init {
-    SDImageCache *cache = [SDImageCache sharedImageCache];
-    SDWebImageDownloader *downloader = [SDWebImageDownloader sharedDownloader];
-    return [self initWithCache:cache downloader:downloader];
-}
-
-- (nonnull instancetype)initWithCache:(nonnull SDImageCache *)cache downloader:(nonnull SDWebImageDownloader *)downloader {
-    if ((self = [super init])) {
-        _imageCache = cache;
-        _imageDownloader = downloader;
-        _failedURLs = [NSMutableSet new];
-        _failedURLsLock = dispatch_semaphore_create(1);
-        _runningOperations = [NSMutableSet new];
-        _runningOperationsLock = dispatch_semaphore_create(1);
-    }
-    return self;
-}
-
-- (nullable NSString *)cacheKeyForURL:(nullable NSURL *)url {
-    if (!url) {
-        return @"";
-    }
-
-    if (self.cacheKeyFilter) {
-        return self.cacheKeyFilter(url);
-    } else {
-        return url.absoluteString;
-    }
-}
-
-- (nullable UIImage *)scaledImageForKey:(nullable NSString *)key image:(nullable UIImage *)image {
-    return SDScaledImageForKey(key, image);
-}
-
-- (void)cachedImageExistsForURL:(nullable NSURL *)url
-                     completion:(nullable SDWebImageCheckCacheCompletionBlock)completionBlock {
-    NSString *key = [self cacheKeyForURL:url];
-    
-    BOOL isInMemoryCache = ([self.imageCache imageFromMemoryCacheForKey:key] != nil);
-    
-    if (isInMemoryCache) {
-        // making sure we call the completion block on the main queue
-        dispatch_async(dispatch_get_main_queue(), ^{
-            if (completionBlock) {
-                completionBlock(YES);
-            }
-        });
-        return;
-    }
-    
-    [self.imageCache diskImageExistsWithKey:key completion:^(BOOL isInDiskCache) {
-        // the completion block of checkDiskCacheForImageWithKey:completion: is always called on the main queue, no need to further dispatch
-        if (completionBlock) {
-            completionBlock(isInDiskCache);
-        }
-    }];
-}
-
-- (void)diskImageExistsForURL:(nullable NSURL *)url
-                   completion:(nullable SDWebImageCheckCacheCompletionBlock)completionBlock {
-    NSString *key = [self cacheKeyForURL:url];
-    
-    [self.imageCache diskImageExistsWithKey:key completion:^(BOOL isInDiskCache) {
-        // the completion block of checkDiskCacheForImageWithKey:completion: is always called on the main queue, no need to further dispatch
-        if (completionBlock) {
-            completionBlock(isInDiskCache);
-        }
-    }];
-}
-
-- (id <SDWebImageOperation>)loadImageWithURL:(nullable NSURL *)url
-                                     options:(SDWebImageOptions)options
-                                    progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
-                                   completed:(nullable SDInternalCompletionBlock)completedBlock {
-    // Invoking this method without a completedBlock is pointless
-    NSAssert(completedBlock != nil, @"If you mean to prefetch the image, use -[SDWebImagePrefetcher prefetchURLs] instead");
-
-    // Very common mistake is to send the URL using NSString object instead of NSURL. For some strange reason, Xcode won't
-    // throw any warning for this type mismatch. Here we failsafe this error by allowing URLs to be passed as NSString.
-    if ([url isKindOfClass:NSString.class]) {
-        url = [NSURL URLWithString:(NSString *)url];
-    }
-
-    // Prevents app crashing on argument type error like sending NSNull instead of NSURL
-    if (![url isKindOfClass:NSURL.class]) {
-        url = nil;
-    }
-
-    SDWebImageCombinedOperation *operation = [SDWebImageCombinedOperation new];
-    operation.manager = self;
-
-    BOOL isFailedUrl = NO;
-    if (url) {
-        LOCK(self.failedURLsLock);
-        isFailedUrl = [self.failedURLs containsObject:url];
-        UNLOCK(self.failedURLsLock);
-    }
-
-    if (url.absoluteString.length == 0 || (!(options & SDWebImageRetryFailed) && isFailedUrl)) {
-        [self callCompletionBlockForOperation:operation completion:completedBlock error:[NSError errorWithDomain:NSURLErrorDomain code:NSURLErrorFileDoesNotExist userInfo:nil] url:url];
-        return operation;
-    }
-
-    LOCK(self.runningOperationsLock);
-    [self.runningOperations addObject:operation];
-    UNLOCK(self.runningOperationsLock);
-    NSString *key = [self cacheKeyForURL:url];
-    
-    SDImageCacheOptions cacheOptions = 0;
-    if (options & SDWebImageQueryDataWhenInMemory) cacheOptions |= SDImageCacheQueryDataWhenInMemory;
-    if (options & SDWebImageQueryDiskSync) cacheOptions |= SDImageCacheQueryDiskSync;
-    if (options & SDWebImageScaleDownLargeImages) cacheOptions |= SDImageCacheScaleDownLargeImages;
-    
-    __weak SDWebImageCombinedOperation *weakOperation = operation;
-    operation.cacheOperation = [self.imageCache queryCacheOperationForKey:key options:cacheOptions done:^(UIImage *cachedImage, NSData *cachedData, SDImageCacheType cacheType) {
-        __strong __typeof(weakOperation) strongOperation = weakOperation;
-        if (!strongOperation || strongOperation.isCancelled) {
-            [self safelyRemoveOperationFromRunning:strongOperation];
-            return;
-        }
-        
-        // Check whether we should download image from network
-        BOOL shouldDownload = (!(options & SDWebImageFromCacheOnly))
-            && (!cachedImage || options & SDWebImageRefreshCached)
-            && (![self.delegate respondsToSelector:@selector(imageManager:shouldDownloadImageForURL:)] || [self.delegate imageManager:self shouldDownloadImageForURL:url]);
-        if (shouldDownload) {
-            if (cachedImage && options & SDWebImageRefreshCached) {
-                // If image was found in the cache but SDWebImageRefreshCached is provided, notify about the cached image
-                // AND try to re-download it in order to let a chance to NSURLCache to refresh it from server.
-                [self callCompletionBlockForOperation:strongOperation completion:completedBlock image:cachedImage data:cachedData error:nil cacheType:cacheType finished:YES url:url];
-            }
-
-            // download if no image or requested to refresh anyway, and download allowed by delegate
-            SDWebImageDownloaderOptions downloaderOptions = 0;
-            if (options & SDWebImageLowPriority) downloaderOptions |= SDWebImageDownloaderLowPriority;
-            if (options & SDWebImageProgressiveDownload) downloaderOptions |= SDWebImageDownloaderProgressiveDownload;
-            if (options & SDWebImageRefreshCached) downloaderOptions |= SDWebImageDownloaderUseNSURLCache;
-            if (options & SDWebImageContinueInBackground) downloaderOptions |= SDWebImageDownloaderContinueInBackground;
-            if (options & SDWebImageHandleCookies) downloaderOptions |= SDWebImageDownloaderHandleCookies;
-            if (options & SDWebImageAllowInvalidSSLCertificates) downloaderOptions |= SDWebImageDownloaderAllowInvalidSSLCertificates;
-            if (options & SDWebImageHighPriority) downloaderOptions |= SDWebImageDownloaderHighPriority;
-            if (options & SDWebImageScaleDownLargeImages) downloaderOptions |= SDWebImageDownloaderScaleDownLargeImages;
-            
-            if (cachedImage && options & SDWebImageRefreshCached) {
-                // force progressive off if image already cached but forced refreshing
-                downloaderOptions &= ~SDWebImageDownloaderProgressiveDownload;
-                // ignore image read from NSURLCache if image if cached but force refreshing
-                downloaderOptions |= SDWebImageDownloaderIgnoreCachedResponse;
-            }
-            
-            // `SDWebImageCombinedOperation` -> `SDWebImageDownloadToken` -> `downloadOperationCancelToken`, which is a `SDCallbacksDictionary` and retain the completed block below, so we need weak-strong again to avoid retain cycle
-            __weak typeof(strongOperation) weakSubOperation = strongOperation;
-            strongOperation.downloadToken = [self.imageDownloader downloadImageWithURL:url options:downloaderOptions progress:progressBlock completed:^(UIImage *downloadedImage, NSData *downloadedData, NSError *error, BOOL finished) {
-                __strong typeof(weakSubOperation) strongSubOperation = weakSubOperation;
-                if (!strongSubOperation || strongSubOperation.isCancelled) {
-                    // Do nothing if the operation was cancelled
-                    // See #699 for more details
-                    // if we would call the completedBlock, there could be a race condition between this block and another completedBlock for the same object, so if this one is called second, we will overwrite the new data
-                } else if (error) {
-                    [self callCompletionBlockForOperation:strongSubOperation completion:completedBlock error:error url:url];
-                    BOOL shouldBlockFailedURL;
-                    // Check whether we should block failed url
-                    if ([self.delegate respondsToSelector:@selector(imageManager:shouldBlockFailedURL:withError:)]) {
-                        shouldBlockFailedURL = [self.delegate imageManager:self shouldBlockFailedURL:url withError:error];
-                    } else {
-                        shouldBlockFailedURL = (   error.code != NSURLErrorNotConnectedToInternet
-                                                && error.code != NSURLErrorCancelled
-                                                && error.code != NSURLErrorTimedOut
-                                                && error.code != NSURLErrorInternationalRoamingOff
-                                                && error.code != NSURLErrorDataNotAllowed
-                                                && error.code != NSURLErrorCannotFindHost
-                                                && error.code != NSURLErrorCannotConnectToHost
-                                                && error.code != NSURLErrorNetworkConnectionLost);
-                    }
-                    
-                    if (shouldBlockFailedURL) {
-                        LOCK(self.failedURLsLock);
-                        [self.failedURLs addObject:url];
-                        UNLOCK(self.failedURLsLock);
-                    }
-                }
-                else {
-                    if ((options & SDWebImageRetryFailed)) {
-                        LOCK(self.failedURLsLock);
-                        [self.failedURLs removeObject:url];
-                        UNLOCK(self.failedURLsLock);
-                    }
-                    
-                    BOOL cacheOnDisk = !(options & SDWebImageCacheMemoryOnly);
-                    
-                    // We've done the scale process in SDWebImageDownloader with the shared manager, this is used for custom manager and avoid extra scale.
-                    if (self != [SDWebImageManager sharedManager] && self.cacheKeyFilter && downloadedImage) {
-                        downloadedImage = [self scaledImageForKey:key image:downloadedImage];
-                    }
-
-                    if (options & SDWebImageRefreshCached && cachedImage && !downloadedImage) {
-                        // Image refresh hit the NSURLCache cache, do not call the completion block
-                    } else if (downloadedImage && (!downloadedImage.images || (options & SDWebImageTransformAnimatedImage)) && [self.delegate respondsToSelector:@selector(imageManager:transformDownloadedImage:withURL:)]) {
-                        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
-                            UIImage *transformedImage = [self.delegate imageManager:self transformDownloadedImage:downloadedImage withURL:url];
-
-                            if (transformedImage && finished) {
-                                BOOL imageWasTransformed = ![transformedImage isEqual:downloadedImage];
-                                NSData *cacheData;
-                                // pass nil if the image was transformed, so we can recalculate the data from the image
-                                if (self.cacheSerializer) {
-                                    cacheData = self.cacheSerializer(transformedImage, (imageWasTransformed ? nil : downloadedData), url);
-                                } else {
-                                    cacheData = (imageWasTransformed ? nil : downloadedData);
-                                }
-                                [self.imageCache storeImage:transformedImage imageData:cacheData forKey:key toDisk:cacheOnDisk completion:nil];
-                            }
-                            
-                            [self callCompletionBlockForOperation:strongSubOperation completion:completedBlock image:transformedImage data:downloadedData error:nil cacheType:SDImageCacheTypeNone finished:finished url:url];
-                        });
-                    } else {
-                        if (downloadedImage && finished) {
-                            if (self.cacheSerializer) {
-                                dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
-                                    NSData *cacheData = self.cacheSerializer(downloadedImage, downloadedData, url);
-                                    [self.imageCache storeImage:downloadedImage imageData:cacheData forKey:key toDisk:cacheOnDisk completion:nil];
-                                });
-                            } else {
-                                [self.imageCache storeImage:downloadedImage imageData:downloadedData forKey:key toDisk:cacheOnDisk completion:nil];
-                            }
-                        }
-                        [self callCompletionBlockForOperation:strongSubOperation completion:completedBlock image:downloadedImage data:downloadedData error:nil cacheType:SDImageCacheTypeNone finished:finished url:url];
-                    }
-                }
-
-                if (finished) {
-                    [self safelyRemoveOperationFromRunning:strongSubOperation];
-                }
-            }];
-        } else if (cachedImage) {
-            [self callCompletionBlockForOperation:strongOperation completion:completedBlock image:cachedImage data:cachedData error:nil cacheType:cacheType finished:YES url:url];
-            [self safelyRemoveOperationFromRunning:strongOperation];
-        } else {
-            // Image not in cache and download disallowed by delegate
-            [self callCompletionBlockForOperation:strongOperation completion:completedBlock image:nil data:nil error:nil cacheType:SDImageCacheTypeNone finished:YES url:url];
-            [self safelyRemoveOperationFromRunning:strongOperation];
-        }
-    }];
-
-    return operation;
-}
-
-- (void)saveImageToCache:(nullable UIImage *)image forURL:(nullable NSURL *)url {
-    if (image && url) {
-        NSString *key = [self cacheKeyForURL:url];
-        [self.imageCache storeImage:image forKey:key toDisk:YES completion:nil];
-    }
-}
-
-- (void)cancelAll {
-    LOCK(self.runningOperationsLock);
-    NSSet<SDWebImageCombinedOperation *> *copiedOperations = [self.runningOperations copy];
-    UNLOCK(self.runningOperationsLock);
-    [copiedOperations makeObjectsPerformSelector:@selector(cancel)]; // This will call `safelyRemoveOperationFromRunning:` and remove from the array
-}
-
-- (BOOL)isRunning {
-    BOOL isRunning = NO;
-    LOCK(self.runningOperationsLock);
-    isRunning = (self.runningOperations.count > 0);
-    UNLOCK(self.runningOperationsLock);
-    return isRunning;
-}
-
-- (void)safelyRemoveOperationFromRunning:(nullable SDWebImageCombinedOperation*)operation {
-    if (!operation) {
-        return;
-    }
-    LOCK(self.runningOperationsLock);
-    [self.runningOperations removeObject:operation];
-    UNLOCK(self.runningOperationsLock);
-}
-
-- (void)callCompletionBlockForOperation:(nullable SDWebImageCombinedOperation*)operation
-                             completion:(nullable SDInternalCompletionBlock)completionBlock
-                                  error:(nullable NSError *)error
-                                    url:(nullable NSURL *)url {
-    [self callCompletionBlockForOperation:operation completion:completionBlock image:nil data:nil error:error cacheType:SDImageCacheTypeNone finished:YES url:url];
-}
-
-- (void)callCompletionBlockForOperation:(nullable SDWebImageCombinedOperation*)operation
-                             completion:(nullable SDInternalCompletionBlock)completionBlock
-                                  image:(nullable UIImage *)image
-                                   data:(nullable NSData *)data
-                                  error:(nullable NSError *)error
-                              cacheType:(SDImageCacheType)cacheType
-                               finished:(BOOL)finished
-                                    url:(nullable NSURL *)url {
-    dispatch_main_async_safe(^{
-        if (operation && !operation.isCancelled && completionBlock) {
-            completionBlock(image, data, error, cacheType, finished, url);
-        }
-    });
-}
-
-@end
-
-
-@implementation SDWebImageCombinedOperation
-
-- (void)cancel {
-    @synchronized(self) {
-        self.cancelled = YES;
-        if (self.cacheOperation) {
-            [self.cacheOperation cancel];
-            self.cacheOperation = nil;
-        }
-        if (self.downloadToken) {
-            [self.manager.imageDownloader cancel:self.downloadToken];
-        }
-        [self.manager safelyRemoveOperationFromRunning:self];
-    }
-}
-
-@end
diff --git a/SDWebImage/SDWebImagePrefetcher.h b/SDWebImage/SDWebImagePrefetcher.h
deleted file mode 100644
index 93357f4ec..000000000
--- a/SDWebImage/SDWebImagePrefetcher.h
+++ /dev/null
@@ -1,112 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import <Foundation/Foundation.h>
-#import "SDWebImageManager.h"
-
-@class SDWebImagePrefetcher;
-
-@protocol SDWebImagePrefetcherDelegate <NSObject>
-
-@optional
-
-/**
- * Called when an image was prefetched.
- *
- * @param imagePrefetcher The current image prefetcher
- * @param imageURL        The image url that was prefetched
- * @param finishedCount   The total number of images that were prefetched (successful or not)
- * @param totalCount      The total number of images that were to be prefetched
- */
-- (void)imagePrefetcher:(nonnull SDWebImagePrefetcher *)imagePrefetcher didPrefetchURL:(nullable NSURL *)imageURL finishedCount:(NSUInteger)finishedCount totalCount:(NSUInteger)totalCount;
-
-/**
- * Called when all images are prefetched.
- * @param imagePrefetcher The current image prefetcher
- * @param totalCount      The total number of images that were prefetched (whether successful or not)
- * @param skippedCount    The total number of images that were skipped
- */
-- (void)imagePrefetcher:(nonnull SDWebImagePrefetcher *)imagePrefetcher didFinishWithTotalCount:(NSUInteger)totalCount skippedCount:(NSUInteger)skippedCount;
-
-@end
-
-typedef void(^SDWebImagePrefetcherProgressBlock)(NSUInteger noOfFinishedUrls, NSUInteger noOfTotalUrls);
-typedef void(^SDWebImagePrefetcherCompletionBlock)(NSUInteger noOfFinishedUrls, NSUInteger noOfSkippedUrls);
-
-/**
- * Prefetch some URLs in the cache for future use. Images are downloaded in low priority.
- */
-@interface SDWebImagePrefetcher : NSObject
-
-/**
- *  The web image manager
- */
-@property (strong, nonatomic, readonly, nonnull) SDWebImageManager *manager;
-
-/**
- * Maximum number of URLs to prefetch at the same time. Defaults to 3.
- */
-@property (nonatomic, assign) NSUInteger maxConcurrentDownloads;
-
-/**
- * SDWebImageOptions for prefetcher. Defaults to SDWebImageLowPriority.
- */
-@property (nonatomic, assign) SDWebImageOptions options;
-
-/**
- * Queue options for Prefetcher. Defaults to Main Queue.
- */
-@property (strong, nonatomic, nonnull) dispatch_queue_t prefetcherQueue;
-
-@property (weak, nonatomic, nullable) id <SDWebImagePrefetcherDelegate> delegate;
-
-/**
- * Return the global image prefetcher instance.
- */
-+ (nonnull instancetype)sharedImagePrefetcher;
-
-/**
- * Allows you to instantiate a prefetcher with any arbitrary image manager.
- */
-- (nonnull instancetype)initWithImageManager:(nonnull SDWebImageManager *)manager NS_DESIGNATED_INITIALIZER;
-
-/**
- * Assign list of URLs to let SDWebImagePrefetcher to queue the prefetching,
- * currently one image is downloaded at a time,
- * and skips images for failed downloads and proceed to the next image in the list.
- * Any previously-running prefetch operations are canceled.
- *
- * @param urls list of URLs to prefetch
- */
-- (void)prefetchURLs:(nullable NSArray<NSURL *> *)urls;
-
-/**
- * Assign list of URLs to let SDWebImagePrefetcher to queue the prefetching,
- * currently one image is downloaded at a time,
- * and skips images for failed downloads and proceed to the next image in the list.
- * Any previously-running prefetch operations are canceled.
- *
- * @param urls            list of URLs to prefetch
- * @param progressBlock   block to be called when progress updates; 
- *                        first parameter is the number of completed (successful or not) requests, 
- *                        second parameter is the total number of images originally requested to be prefetched
- * @param completionBlock block to be called when prefetching is completed
- *                        first param is the number of completed (successful or not) requests,
- *                        second parameter is the number of skipped requests
- */
-- (void)prefetchURLs:(nullable NSArray<NSURL *> *)urls
-            progress:(nullable SDWebImagePrefetcherProgressBlock)progressBlock
-           completed:(nullable SDWebImagePrefetcherCompletionBlock)completionBlock;
-
-/**
- * Remove and cancel queued list
- */
-- (void)cancelPrefetching;
-
-
-@end
diff --git a/SDWebImage/SDWebImagePrefetcher.m b/SDWebImage/SDWebImagePrefetcher.m
deleted file mode 100644
index 18c433e7d..000000000
--- a/SDWebImage/SDWebImagePrefetcher.m
+++ /dev/null
@@ -1,144 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "SDWebImagePrefetcher.h"
-
-@interface SDWebImagePrefetcher ()
-
-@property (strong, nonatomic, nonnull) SDWebImageManager *manager;
-@property (strong, atomic, nullable) NSArray<NSURL *> *prefetchURLs; // may be accessed from different queue
-@property (assign, nonatomic) NSUInteger requestedCount;
-@property (assign, nonatomic) NSUInteger skippedCount;
-@property (assign, nonatomic) NSUInteger finishedCount;
-@property (assign, nonatomic) NSTimeInterval startedTime;
-@property (copy, nonatomic, nullable) SDWebImagePrefetcherCompletionBlock completionBlock;
-@property (copy, nonatomic, nullable) SDWebImagePrefetcherProgressBlock progressBlock;
-
-@end
-
-@implementation SDWebImagePrefetcher
-
-+ (nonnull instancetype)sharedImagePrefetcher {
-    static dispatch_once_t once;
-    static id instance;
-    dispatch_once(&once, ^{
-        instance = [self new];
-    });
-    return instance;
-}
-
-- (nonnull instancetype)init {
-    return [self initWithImageManager:[SDWebImageManager new]];
-}
-
-- (nonnull instancetype)initWithImageManager:(SDWebImageManager *)manager {
-    if ((self = [super init])) {
-        _manager = manager;
-        _options = SDWebImageLowPriority;
-        _prefetcherQueue = dispatch_get_main_queue();
-        self.maxConcurrentDownloads = 3;
-    }
-    return self;
-}
-
-- (void)setMaxConcurrentDownloads:(NSUInteger)maxConcurrentDownloads {
-    self.manager.imageDownloader.maxConcurrentDownloads = maxConcurrentDownloads;
-}
-
-- (NSUInteger)maxConcurrentDownloads {
-    return self.manager.imageDownloader.maxConcurrentDownloads;
-}
-
-- (void)startPrefetchingAtIndex:(NSUInteger)index {
-    NSURL *currentURL;
-    @synchronized(self) {
-        if (index >= self.prefetchURLs.count) return;
-        currentURL = self.prefetchURLs[index];
-        self.requestedCount++;
-    }
-    [self.manager loadImageWithURL:currentURL options:self.options progress:nil completed:^(UIImage *image, NSData *data, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {
-        if (!finished) return;
-        self.finishedCount++;
-
-        if (self.progressBlock) {
-            self.progressBlock(self.finishedCount,(self.prefetchURLs).count);
-        }
-        if (!image) {
-            // Add last failed
-            self.skippedCount++;
-        }
-        if ([self.delegate respondsToSelector:@selector(imagePrefetcher:didPrefetchURL:finishedCount:totalCount:)]) {
-            [self.delegate imagePrefetcher:self
-                            didPrefetchURL:currentURL
-                             finishedCount:self.finishedCount
-                                totalCount:self.prefetchURLs.count
-             ];
-        }
-        if (self.prefetchURLs.count > self.requestedCount) {
-            dispatch_async(self.prefetcherQueue, ^{
-                // we need dispatch to avoid function recursion call. This can prevent stack overflow even for huge urls list
-                [self startPrefetchingAtIndex:self.requestedCount];
-            });
-        } else if (self.finishedCount == self.requestedCount) {
-            [self reportStatus];
-            if (self.completionBlock) {
-                self.completionBlock(self.finishedCount, self.skippedCount);
-                self.completionBlock = nil;
-            }
-            self.progressBlock = nil;
-        }
-    }];
-}
-
-- (void)reportStatus {
-    NSUInteger total = (self.prefetchURLs).count;
-    if ([self.delegate respondsToSelector:@selector(imagePrefetcher:didFinishWithTotalCount:skippedCount:)]) {
-        [self.delegate imagePrefetcher:self
-               didFinishWithTotalCount:(total - self.skippedCount)
-                          skippedCount:self.skippedCount
-         ];
-    }
-}
-
-- (void)prefetchURLs:(nullable NSArray<NSURL *> *)urls {
-    [self prefetchURLs:urls progress:nil completed:nil];
-}
-
-- (void)prefetchURLs:(nullable NSArray<NSURL *> *)urls
-            progress:(nullable SDWebImagePrefetcherProgressBlock)progressBlock
-           completed:(nullable SDWebImagePrefetcherCompletionBlock)completionBlock {
-    [self cancelPrefetching]; // Prevent duplicate prefetch request
-    self.startedTime = CFAbsoluteTimeGetCurrent();
-    self.prefetchURLs = urls;
-    self.completionBlock = completionBlock;
-    self.progressBlock = progressBlock;
-
-    if (urls.count == 0) {
-        if (completionBlock) {
-            completionBlock(0,0);
-        }
-    } else {
-        // Starts prefetching from the very first image on the list with the max allowed concurrency
-        NSUInteger listCount = self.prefetchURLs.count;
-        for (NSUInteger i = 0; i < self.maxConcurrentDownloads && self.requestedCount < listCount; i++) {
-            [self startPrefetchingAtIndex:i];
-        }
-    }
-}
-
-- (void)cancelPrefetching {
-    @synchronized(self) {
-        self.prefetchURLs = nil;
-        self.skippedCount = 0;
-        self.requestedCount = 0;
-        self.finishedCount = 0;
-    }
-    [self.manager cancelAll];
-}
-
-@end
diff --git a/SDWebImage/SDWebImageTransition.h b/SDWebImage/SDWebImageTransition.h
deleted file mode 100644
index 67401088b..000000000
--- a/SDWebImage/SDWebImageTransition.h
+++ /dev/null
@@ -1,98 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "SDWebImageCompat.h"
-
-#if SD_UIKIT || SD_MAC
-#import "SDImageCache.h"
-
-// This class is used to provide a transition animation after the view category load image finished. Use this on `sd_imageTransition` in UIView+WebCache.h
-// for UIKit(iOS & tvOS), we use `+[UIView transitionWithView:duration:options:animations:completion]` for transition animation.
-// for AppKit(macOS), we use `+[NSAnimationContext runAnimationGroup:completionHandler:]` for transition animation. You can call `+[NSAnimationContext currentContext]` to grab the context during animations block.
-// These transition are provided for basic usage. If you need complicated animation, consider to directly use Core Animation or use `SDWebImageAvoidAutoSetImage` and implement your own after image load finished.
-
-#if SD_UIKIT
-typedef UIViewAnimationOptions SDWebImageAnimationOptions;
-#else
-typedef NS_OPTIONS(NSUInteger, SDWebImageAnimationOptions) {
-    SDWebImageAnimationOptionAllowsImplicitAnimation = 1 << 0, // specify `allowsImplicitAnimation` for the `NSAnimationContext`
-};
-#endif
-
-typedef void (^SDWebImageTransitionPreparesBlock)(__kindof UIView * _Nonnull view, UIImage * _Nullable image, NSData * _Nullable imageData, SDImageCacheType cacheType, NSURL * _Nullable imageURL);
-typedef void (^SDWebImageTransitionAnimationsBlock)(__kindof UIView * _Nonnull view, UIImage * _Nullable image);
-typedef void (^SDWebImageTransitionCompletionBlock)(BOOL finished);
-
-@interface SDWebImageTransition : NSObject
-
-/**
- By default, we set the image to the view at the beginning of the animtions. You can disable this and provide custom set image process
- */
-@property (nonatomic, assign) BOOL avoidAutoSetImage;
-/**
- The duration of the transition animation, measured in seconds. Defaults to 0.5.
- */
-@property (nonatomic, assign) NSTimeInterval duration;
-/**
- The timing function used for all animations within this transition animation (macOS).
- */
-@property (nonatomic, strong, nullable) CAMediaTimingFunction *timingFunction NS_AVAILABLE_MAC(10_7);
-/**
- A mask of options indicating how you want to perform the animations.
- */
-@property (nonatomic, assign) SDWebImageAnimationOptions animationOptions;
-/**
- A block object to be executed before the animation sequence starts.
- */
-@property (nonatomic, copy, nullable) SDWebImageTransitionPreparesBlock prepares;
-/**
- A block object that contains the changes you want to make to the specified view.
- */
-@property (nonatomic, copy, nullable) SDWebImageTransitionAnimationsBlock animations;
-/**
- A block object to be executed when the animation sequence ends.
- */
-@property (nonatomic, copy, nullable) SDWebImageTransitionCompletionBlock completion;
-
-@end
-
-// Convenience way to create transition. Remember to specify the duration if needed.
-// for UIKit, these transition just use the correspond `animationOptions`. By default we enable `UIViewAnimationOptionAllowUserInteraction` to allow user interaction during transition.
-// for AppKit, these transition use Core Animation in `animations`. So your view must be layer-backed. Set `wantsLayer = YES` before you apply it.
-
-@interface SDWebImageTransition (Conveniences)
-
-// class property is available in Xcode 8. We will drop the Xcode 7.3 support in 5.x
-#if __has_feature(objc_class_property)
-/// Fade transition.
-@property (nonatomic, class, nonnull, readonly) SDWebImageTransition *fadeTransition;
-/// Flip from left transition.
-@property (nonatomic, class, nonnull, readonly) SDWebImageTransition *flipFromLeftTransition;
-/// Flip from right transition.
-@property (nonatomic, class, nonnull, readonly) SDWebImageTransition *flipFromRightTransition;
-/// Flip from top transition.
-@property (nonatomic, class, nonnull, readonly) SDWebImageTransition *flipFromTopTransition;
-/// Flip from bottom transition.
-@property (nonatomic, class, nonnull, readonly) SDWebImageTransition *flipFromBottomTransition;
-/// Curl up transition.
-@property (nonatomic, class, nonnull, readonly) SDWebImageTransition *curlUpTransition;
-/// Curl down transition.
-@property (nonatomic, class, nonnull, readonly) SDWebImageTransition *curlDownTransition;
-#else
-+ (nonnull instancetype)fadeTransition;
-+ (nonnull instancetype)flipFromLeftTransition;
-+ (nonnull instancetype)flipFromRightTransition;
-+ (nonnull instancetype)flipFromTopTransition;
-+ (nonnull instancetype)flipFromBottomTransition;
-+ (nonnull instancetype)curlUpTransition;
-+ (nonnull instancetype)curlDownTransition;
-#endif
-
-@end
-
-#endif
diff --git a/SDWebImage/SDWebImageTransition.m b/SDWebImage/SDWebImageTransition.m
deleted file mode 100644
index b04a4c343..000000000
--- a/SDWebImage/SDWebImageTransition.m
+++ /dev/null
@@ -1,137 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "SDWebImageTransition.h"
-
-#if SD_UIKIT || SD_MAC
-
-#if SD_MAC
-#import <QuartzCore/QuartzCore.h>
-#endif
-
-@implementation SDWebImageTransition
-
-- (instancetype)init {
-    self = [super init];
-    if (self) {
-        self.duration = 0.5;
-    }
-    return self;
-}
-
-@end
-
-@implementation SDWebImageTransition (Conveniences)
-
-+ (SDWebImageTransition *)fadeTransition {
-    SDWebImageTransition *transition = [SDWebImageTransition new];
-#if SD_UIKIT
-    transition.animationOptions = UIViewAnimationOptionTransitionCrossDissolve | UIViewAnimationOptionAllowUserInteraction;
-#else
-    transition.animations = ^(__kindof NSView * _Nonnull view, NSImage * _Nullable image) {
-        CATransition *trans = [CATransition animation];
-        trans.type = kCATransitionFade;
-        [view.layer addAnimation:trans forKey:kCATransition];
-    };
-#endif
-    return transition;
-}
-
-+ (SDWebImageTransition *)flipFromLeftTransition {
-    SDWebImageTransition *transition = [SDWebImageTransition new];
-#if SD_UIKIT
-    transition.animationOptions = UIViewAnimationOptionTransitionFlipFromLeft | UIViewAnimationOptionAllowUserInteraction;
-#else
-    transition.animations = ^(__kindof NSView * _Nonnull view, NSImage * _Nullable image) {
-        CATransition *trans = [CATransition animation];
-        trans.type = kCATransitionPush;
-        trans.subtype = kCATransitionFromLeft;
-        [view.layer addAnimation:trans forKey:kCATransition];
-    };
-#endif
-    return transition;
-}
-
-+ (SDWebImageTransition *)flipFromRightTransition {
-    SDWebImageTransition *transition = [SDWebImageTransition new];
-#if SD_UIKIT
-    transition.animationOptions = UIViewAnimationOptionTransitionFlipFromRight | UIViewAnimationOptionAllowUserInteraction;
-#else
-    transition.animations = ^(__kindof NSView * _Nonnull view, NSImage * _Nullable image) {
-        CATransition *trans = [CATransition animation];
-        trans.type = kCATransitionPush;
-        trans.subtype = kCATransitionFromRight;
-        [view.layer addAnimation:trans forKey:kCATransition];
-    };
-#endif
-    return transition;
-}
-
-+ (SDWebImageTransition *)flipFromTopTransition {
-    SDWebImageTransition *transition = [SDWebImageTransition new];
-#if SD_UIKIT
-    transition.animationOptions = UIViewAnimationOptionTransitionFlipFromTop | UIViewAnimationOptionAllowUserInteraction;
-#else
-    transition.animations = ^(__kindof NSView * _Nonnull view, NSImage * _Nullable image) {
-        CATransition *trans = [CATransition animation];
-        trans.type = kCATransitionPush;
-        trans.subtype = kCATransitionFromTop;
-        [view.layer addAnimation:trans forKey:kCATransition];
-    };
-#endif
-    return transition;
-}
-
-+ (SDWebImageTransition *)flipFromBottomTransition {
-    SDWebImageTransition *transition = [SDWebImageTransition new];
-#if SD_UIKIT
-    transition.animationOptions = UIViewAnimationOptionTransitionFlipFromBottom | UIViewAnimationOptionAllowUserInteraction;
-#else
-    transition.animations = ^(__kindof NSView * _Nonnull view, NSImage * _Nullable image) {
-        CATransition *trans = [CATransition animation];
-        trans.type = kCATransitionPush;
-        trans.subtype = kCATransitionFromBottom;
-        [view.layer addAnimation:trans forKey:kCATransition];
-    };
-#endif
-    return transition;
-}
-
-+ (SDWebImageTransition *)curlUpTransition {
-    SDWebImageTransition *transition = [SDWebImageTransition new];
-#if SD_UIKIT
-    transition.animationOptions = UIViewAnimationOptionTransitionCurlUp | UIViewAnimationOptionAllowUserInteraction;
-#else
-    transition.animations = ^(__kindof NSView * _Nonnull view, NSImage * _Nullable image) {
-        CATransition *trans = [CATransition animation];
-        trans.type = kCATransitionReveal;
-        trans.subtype = kCATransitionFromTop;
-        [view.layer addAnimation:trans forKey:kCATransition];
-    };
-#endif
-    return transition;
-}
-
-+ (SDWebImageTransition *)curlDownTransition {
-    SDWebImageTransition *transition = [SDWebImageTransition new];
-#if SD_UIKIT
-    transition.animationOptions = UIViewAnimationOptionTransitionCurlDown | UIViewAnimationOptionAllowUserInteraction;
-#else
-    transition.animations = ^(__kindof NSView * _Nonnull view, NSImage * _Nullable image) {
-        CATransition *trans = [CATransition animation];
-        trans.type = kCATransitionReveal;
-        trans.subtype = kCATransitionFromBottom;
-        [view.layer addAnimation:trans forKey:kCATransition];
-    };
-#endif
-    return transition;
-}
-
-@end
-
-#endif
diff --git a/SDWebImage/SDWebImageWebPCoder.h b/SDWebImage/SDWebImageWebPCoder.h
deleted file mode 100644
index 634b5751b..000000000
--- a/SDWebImage/SDWebImageWebPCoder.h
+++ /dev/null
@@ -1,23 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#ifdef SD_WEBP
-
-#import <Foundation/Foundation.h>
-#import "SDWebImageCoder.h"
-
-/**
- Built in coder that supports WebP and animated WebP
- */
-@interface SDWebImageWebPCoder : NSObject <SDWebImageProgressiveCoder>
-
-+ (nonnull instancetype)sharedCoder;
-
-@end
-
-#endif
diff --git a/SDWebImage/SDWebImageWebPCoder.m b/SDWebImage/SDWebImageWebPCoder.m
deleted file mode 100644
index 7971d231e..000000000
--- a/SDWebImage/SDWebImageWebPCoder.m
+++ /dev/null
@@ -1,529 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#ifdef SD_WEBP
-
-#import "SDWebImageWebPCoder.h"
-#import "SDWebImageCoderHelper.h"
-#import "NSImage+WebCache.h"
-#import "UIImage+MultiFormat.h"
-#if __has_include(<webp/decode.h>) && __has_include(<webp/encode.h>) && __has_include(<webp/demux.h>) && __has_include(<webp/mux.h>)
-#import <webp/decode.h>
-#import <webp/encode.h>
-#import <webp/demux.h>
-#import <webp/mux.h>
-#else
-#import "webp/decode.h"
-#import "webp/encode.h"
-#import "webp/demux.h"
-#import "webp/mux.h"
-#endif
-#import <Accelerate/Accelerate.h>
-
-@implementation SDWebImageWebPCoder {
-    WebPIDecoder *_idec;
-}
-
-- (void)dealloc {
-    if (_idec) {
-        WebPIDelete(_idec);
-        _idec = NULL;
-    }
-}
-
-+ (instancetype)sharedCoder {
-    static SDWebImageWebPCoder *coder;
-    static dispatch_once_t onceToken;
-    dispatch_once(&onceToken, ^{
-        coder = [[SDWebImageWebPCoder alloc] init];
-    });
-    return coder;
-}
-
-#pragma mark - Decode
-- (BOOL)canDecodeFromData:(nullable NSData *)data {
-    return ([NSData sd_imageFormatForImageData:data] == SDImageFormatWebP);
-}
-
-- (BOOL)canIncrementallyDecodeFromData:(NSData *)data {
-    return ([NSData sd_imageFormatForImageData:data] == SDImageFormatWebP);
-}
-
-- (UIImage *)decodedImageWithData:(NSData *)data {
-    if (!data) {
-        return nil;
-    }
-    
-    WebPData webpData;
-    WebPDataInit(&webpData);
-    webpData.bytes = data.bytes;
-    webpData.size = data.length;
-    WebPDemuxer *demuxer = WebPDemux(&webpData);
-    if (!demuxer) {
-        return nil;
-    }
-    
-    uint32_t flags = WebPDemuxGetI(demuxer, WEBP_FF_FORMAT_FLAGS);
-    int loopCount = WebPDemuxGetI(demuxer, WEBP_FF_LOOP_COUNT);
-    int canvasWidth = WebPDemuxGetI(demuxer, WEBP_FF_CANVAS_WIDTH);
-    int canvasHeight = WebPDemuxGetI(demuxer, WEBP_FF_CANVAS_HEIGHT);
-    CGBitmapInfo bitmapInfo;
-    // `CGBitmapContextCreate` does not support RGB888 on iOS. Where `CGImageCreate` supports.
-    if (!(flags & ALPHA_FLAG)) {
-        // RGBX8888
-        bitmapInfo = kCGBitmapByteOrder32Big | kCGImageAlphaNoneSkipLast;
-    } else {
-        // RGBA8888
-        bitmapInfo = kCGBitmapByteOrder32Big | kCGImageAlphaPremultipliedLast;
-    }
-    CGContextRef canvas = CGBitmapContextCreate(NULL, canvasWidth, canvasHeight, 8, 0, SDCGColorSpaceGetDeviceRGB(), bitmapInfo);
-    if (!canvas) {
-        WebPDemuxDelete(demuxer);
-        return nil;
-    }
-    
-    if (!(flags & ANIMATION_FLAG)) {
-        // for static single webp image
-        UIImage *staticImage = [self sd_rawWebpImageWithData:webpData];
-        if (staticImage) {
-            // draw on CGBitmapContext can reduce memory usage
-            CGImageRef imageRef = staticImage.CGImage;
-            size_t width = CGImageGetWidth(imageRef);
-            size_t height = CGImageGetHeight(imageRef);
-            CGContextDrawImage(canvas, CGRectMake(0, 0, width, height), imageRef);
-            CGImageRef newImageRef = CGBitmapContextCreateImage(canvas);
-#if SD_UIKIT || SD_WATCH
-            staticImage = [[UIImage alloc] initWithCGImage:newImageRef];
-#else
-            staticImage = [[UIImage alloc] initWithCGImage:newImageRef size:NSZeroSize];
-#endif
-            CGImageRelease(newImageRef);
-        }
-        WebPDemuxDelete(demuxer);
-        CGContextRelease(canvas);
-        staticImage.sd_imageFormat = SDImageFormatWebP;
-        return staticImage;
-    }
-    
-    // for animated webp image
-    WebPIterator iter;
-    if (!WebPDemuxGetFrame(demuxer, 1, &iter)) {
-        WebPDemuxReleaseIterator(&iter);
-        WebPDemuxDelete(demuxer);
-        CGContextRelease(canvas);
-        return nil;
-    }
-    
-    NSMutableArray<SDWebImageFrame *> *frames = [NSMutableArray array];
-    
-    do {
-        @autoreleasepool {
-            UIImage *image = [self sd_drawnWebpImageWithCanvas:canvas iterator:iter];
-            if (!image) {
-                continue;
-            }
-            
-            int duration = iter.duration;
-            if (duration <= 10) {
-                // WebP standard says 0 duration is used for canvas updating but not showing image, but actually Chrome and other implementations set it to 100ms if duration is lower or equal than 10ms
-                // Some animated WebP images also created without duration, we should keep compatibility
-                duration = 100;
-            }
-            SDWebImageFrame *frame = [SDWebImageFrame frameWithImage:image duration:duration / 1000.f];
-            [frames addObject:frame];
-        }
-        
-    } while (WebPDemuxNextFrame(&iter));
-    
-    WebPDemuxReleaseIterator(&iter);
-    WebPDemuxDelete(demuxer);
-    CGContextRelease(canvas);
-    
-    UIImage *animatedImage = [SDWebImageCoderHelper animatedImageWithFrames:frames];
-    animatedImage.sd_imageLoopCount = loopCount;
-    animatedImage.sd_imageFormat = SDImageFormatWebP;
-    
-    return animatedImage;
-}
-
-- (UIImage *)incrementallyDecodedImageWithData:(NSData *)data finished:(BOOL)finished {
-    if (!_idec) {
-        // Progressive images need transparent, so always use premultiplied RGBA
-        _idec = WebPINewRGB(MODE_rgbA, NULL, 0, 0);
-        if (!_idec) {
-            return nil;
-        }
-    }
-    
-    UIImage *image;
-    
-    VP8StatusCode status = WebPIUpdate(_idec, data.bytes, data.length);
-    if (status != VP8_STATUS_OK && status != VP8_STATUS_SUSPENDED) {
-        return nil;
-    }
-    
-    int width = 0;
-    int height = 0;
-    int last_y = 0;
-    int stride = 0;
-    uint8_t *rgba = WebPIDecGetRGB(_idec, &last_y, &width, &height, &stride);
-    // last_y may be 0, means no enough bitmap data to decode, ignore this
-    if (width + height > 0 && last_y > 0 && height >= last_y) {
-        // Construct a UIImage from the decoded RGBA value array
-        size_t rgbaSize = last_y * stride;
-        CGDataProviderRef provider =
-        CGDataProviderCreateWithData(NULL, rgba, rgbaSize, NULL);
-        CGColorSpaceRef colorSpaceRef = SDCGColorSpaceGetDeviceRGB();
-        
-        CGBitmapInfo bitmapInfo = kCGBitmapByteOrder32Big | kCGImageAlphaPremultipliedLast;
-        size_t components = 4;
-        CGColorRenderingIntent renderingIntent = kCGRenderingIntentDefault;
-        // Why to use last_y for image height is because of libwebp's bug (https://bugs.chromium.org/p/webp/issues/detail?id=362)
-        // It will not keep memory barrier safe on x86 architechure (macOS & iPhone simulator) but on ARM architecture (iPhone & iPad & tv & watch) it works great
-        // If different threads use WebPIDecGetRGB to grab rgba bitmap, it will contain the previous decoded bitmap data
-        // So this will cause our drawed image looks strange(above is the current part but below is the previous part)
-        // We only grab the last_y height and draw the last_y heigh instead of total height image
-        // Besides fix, this can enhance performance since we do not need to create extra bitmap
-        CGImageRef imageRef = CGImageCreate(width, last_y, 8, components * 8, components * width, colorSpaceRef, bitmapInfo, provider, NULL, NO, renderingIntent);
-        
-        CGDataProviderRelease(provider);
-        
-        if (!imageRef) {
-            return nil;
-        }
-        
-        CGContextRef canvas = CGBitmapContextCreate(NULL, width, height, 8, 0, SDCGColorSpaceGetDeviceRGB(), bitmapInfo);
-        if (!canvas) {
-            CGImageRelease(imageRef);
-            return nil;
-        }
-        
-        // Only draw the last_y image height, keep remains transparent, in Core Graphics coordinate system
-        CGContextDrawImage(canvas, CGRectMake(0, height - last_y, width, last_y), imageRef);
-        CGImageRef newImageRef = CGBitmapContextCreateImage(canvas);
-        CGImageRelease(imageRef);
-        if (!newImageRef) {
-            CGContextRelease(canvas);
-            return nil;
-        }
-        
-#if SD_UIKIT || SD_WATCH
-        image = [[UIImage alloc] initWithCGImage:newImageRef];
-#else
-        image = [[UIImage alloc] initWithCGImage:newImageRef size:NSZeroSize];
-#endif
-        image.sd_imageFormat = SDImageFormatWebP;
-        CGImageRelease(newImageRef);
-        CGContextRelease(canvas);
-    }
-    
-    if (finished) {
-        if (_idec) {
-            WebPIDelete(_idec);
-            _idec = NULL;
-        }
-    }
-    
-    return image;
-}
-
-- (UIImage *)decompressedImageWithImage:(UIImage *)image
-                                   data:(NSData *__autoreleasing  _Nullable *)data
-                                options:(nullable NSDictionary<NSString*, NSObject*>*)optionsDict {
-    // WebP do not decompress
-    return image;
-}
-
-- (nullable UIImage *)sd_drawnWebpImageWithCanvas:(CGContextRef)canvas iterator:(WebPIterator)iter {
-    UIImage *image = [self sd_rawWebpImageWithData:iter.fragment];
-    if (!image) {
-        return nil;
-    }
-    
-    size_t canvasWidth = CGBitmapContextGetWidth(canvas);
-    size_t canvasHeight = CGBitmapContextGetHeight(canvas);
-    CGSize size = CGSizeMake(canvasWidth, canvasHeight);
-    CGFloat tmpX = iter.x_offset;
-    CGFloat tmpY = size.height - iter.height - iter.y_offset;
-    CGRect imageRect = CGRectMake(tmpX, tmpY, iter.width, iter.height);
-    BOOL shouldBlend = iter.blend_method == WEBP_MUX_BLEND;
-    
-    // If not blend, cover the target image rect. (firstly clear then draw)
-    if (!shouldBlend) {
-        CGContextClearRect(canvas, imageRect);
-    }
-    CGContextDrawImage(canvas, imageRect, image.CGImage);
-    CGImageRef newImageRef = CGBitmapContextCreateImage(canvas);
-    
-#if SD_UIKIT || SD_WATCH
-    image = [[UIImage alloc] initWithCGImage:newImageRef];
-#elif SD_MAC
-    image = [[UIImage alloc] initWithCGImage:newImageRef size:NSZeroSize];
-#endif
-    
-    CGImageRelease(newImageRef);
-    
-    if (iter.dispose_method == WEBP_MUX_DISPOSE_BACKGROUND) {
-        CGContextClearRect(canvas, imageRect);
-    }
-    
-    return image;
-}
-
-- (nullable UIImage *)sd_rawWebpImageWithData:(WebPData)webpData {
-    WebPDecoderConfig config;
-    if (!WebPInitDecoderConfig(&config)) {
-        return nil;
-    }
-    
-    if (WebPGetFeatures(webpData.bytes, webpData.size, &config.input) != VP8_STATUS_OK) {
-        return nil;
-    }
-    
-    config.output.colorspace = config.input.has_alpha ? MODE_rgbA : MODE_RGB;
-    config.options.use_threads = 1;
-    
-    // Decode the WebP image data into a RGBA value array
-    if (WebPDecode(webpData.bytes, webpData.size, &config) != VP8_STATUS_OK) {
-        return nil;
-    }
-    
-    int width = config.input.width;
-    int height = config.input.height;
-    if (config.options.use_scaling) {
-        width = config.options.scaled_width;
-        height = config.options.scaled_height;
-    }
-    
-    // Construct a UIImage from the decoded RGBA value array
-    CGDataProviderRef provider =
-    CGDataProviderCreateWithData(NULL, config.output.u.RGBA.rgba, config.output.u.RGBA.size, FreeImageData);
-    CGColorSpaceRef colorSpaceRef = SDCGColorSpaceGetDeviceRGB();
-    CGBitmapInfo bitmapInfo;
-    // `CGBitmapContextCreate` does not support RGB888 on iOS. Where `CGImageCreate` supports.
-    if (!config.input.has_alpha) {
-        // RGB888
-        bitmapInfo = kCGBitmapByteOrder32Big | kCGImageAlphaNone;
-    } else {
-        // RGBA8888
-        bitmapInfo = kCGBitmapByteOrder32Big | kCGImageAlphaPremultipliedLast;
-    }
-    size_t components = config.input.has_alpha ? 4 : 3;
-    CGColorRenderingIntent renderingIntent = kCGRenderingIntentDefault;
-    CGImageRef imageRef = CGImageCreate(width, height, 8, components * 8, components * width, colorSpaceRef, bitmapInfo, provider, NULL, NO, renderingIntent);
-    
-    CGDataProviderRelease(provider);
-    
-#if SD_UIKIT || SD_WATCH
-    UIImage *image = [[UIImage alloc] initWithCGImage:imageRef];
-#else
-    UIImage *image = [[UIImage alloc] initWithCGImage:imageRef size:NSZeroSize];
-#endif
-    CGImageRelease(imageRef);
-    
-    return image;
-}
-
-#pragma mark - Encode
-- (BOOL)canEncodeToFormat:(SDImageFormat)format {
-    return (format == SDImageFormatWebP);
-}
-
-- (NSData *)encodedDataWithImage:(UIImage *)image format:(SDImageFormat)format {
-    if (!image) {
-        return nil;
-    }
-    
-    NSData *data;
-    
-    NSArray<SDWebImageFrame *> *frames = [SDWebImageCoderHelper framesFromAnimatedImage:image];
-    if (frames.count == 0) {
-        // for static single webp image
-        data = [self sd_encodedWebpDataWithImage:image];
-    } else {
-        // for animated webp image
-        WebPMux *mux = WebPMuxNew();
-        if (!mux) {
-            return nil;
-        }
-        for (size_t i = 0; i < frames.count; i++) {
-            SDWebImageFrame *currentFrame = frames[i];
-            NSData *webpData = [self sd_encodedWebpDataWithImage:currentFrame.image];
-            int duration = currentFrame.duration * 1000;
-            WebPMuxFrameInfo frame = { .bitstream.bytes = webpData.bytes,
-                .bitstream.size = webpData.length,
-                .duration = duration,
-                .id = WEBP_CHUNK_ANMF,
-                .dispose_method = WEBP_MUX_DISPOSE_BACKGROUND, // each frame will clear canvas
-                .blend_method = WEBP_MUX_NO_BLEND
-            };
-            if (WebPMuxPushFrame(mux, &frame, 0) != WEBP_MUX_OK) {
-                WebPMuxDelete(mux);
-                return nil;
-            }
-        }
-        
-        int loopCount = (int)image.sd_imageLoopCount;
-        WebPMuxAnimParams params = { .bgcolor = 0,
-            .loop_count = loopCount
-        };
-        if (WebPMuxSetAnimationParams(mux, &params) != WEBP_MUX_OK) {
-            WebPMuxDelete(mux);
-            return nil;
-        }
-        
-        WebPData outputData;
-        WebPMuxError error = WebPMuxAssemble(mux, &outputData);
-        WebPMuxDelete(mux);
-        if (error != WEBP_MUX_OK) {
-            return nil;
-        }
-        data = [NSData dataWithBytes:outputData.bytes length:outputData.size];
-        WebPDataClear(&outputData);
-    }
-    
-    return data;
-}
-
-- (nullable NSData *)sd_encodedWebpDataWithImage:(nullable UIImage *)image {
-    if (!image) {
-        return nil;
-    }
-    
-    NSData *webpData;
-    CGImageRef imageRef = image.CGImage;
-    
-    size_t width = CGImageGetWidth(imageRef);
-    size_t height = CGImageGetHeight(imageRef);
-    if (width == 0 || width > WEBP_MAX_DIMENSION) {
-        return nil;
-    }
-    if (height == 0 || height > WEBP_MAX_DIMENSION) {
-        return nil;
-    }
-    
-    size_t bytesPerRow = CGImageGetBytesPerRow(imageRef);
-    CGBitmapInfo bitmapInfo = CGImageGetBitmapInfo(imageRef);
-    CGImageAlphaInfo alphaInfo = bitmapInfo & kCGBitmapAlphaInfoMask;
-    CGBitmapInfo byteOrderInfo = bitmapInfo & kCGBitmapByteOrderMask;
-    BOOL hasAlpha = !(alphaInfo == kCGImageAlphaNone ||
-                      alphaInfo == kCGImageAlphaNoneSkipFirst ||
-                      alphaInfo == kCGImageAlphaNoneSkipLast);
-    BOOL byteOrderNormal = NO;
-    switch (byteOrderInfo) {
-        case kCGBitmapByteOrderDefault: {
-            byteOrderNormal = YES;
-        } break;
-        case kCGBitmapByteOrder32Little: {
-        } break;
-        case kCGBitmapByteOrder32Big: {
-            byteOrderNormal = YES;
-        } break;
-        default: break;
-    }
-    // If we can not get bitmap buffer, early return
-    CGDataProviderRef dataProvider = CGImageGetDataProvider(imageRef);
-    if (!dataProvider) {
-        return nil;
-    }
-    CFDataRef dataRef = CGDataProviderCopyData(dataProvider);
-    if (!dataRef) {
-        return nil;
-    }
-    
-    uint8_t *rgba = NULL;
-    // We could not assume that input CGImage's color mode is always RGB888/RGBA8888. Convert all other cases to target color mode using vImage
-    if (byteOrderNormal && ((alphaInfo == kCGImageAlphaNone) || (alphaInfo == kCGImageAlphaLast))) {
-        // If the input CGImage is already RGB888/RGBA8888
-        rgba = (uint8_t *)CFDataGetBytePtr(dataRef);
-    } else {
-        // Convert all other cases to target color mode using vImage
-        vImageConverterRef convertor = NULL;
-        vImage_Error error = kvImageNoError;
-        
-        vImage_CGImageFormat srcFormat = {
-            .bitsPerComponent = (uint32_t)CGImageGetBitsPerComponent(imageRef),
-            .bitsPerPixel = (uint32_t)CGImageGetBitsPerPixel(imageRef),
-            .colorSpace = CGImageGetColorSpace(imageRef),
-            .bitmapInfo = bitmapInfo
-        };
-        vImage_CGImageFormat destFormat = {
-            .bitsPerComponent = 8,
-            .bitsPerPixel = hasAlpha ? 32 : 24,
-            .colorSpace = SDCGColorSpaceGetDeviceRGB(),
-            .bitmapInfo = hasAlpha ? kCGImageAlphaLast | kCGBitmapByteOrderDefault : kCGImageAlphaNone | kCGBitmapByteOrderDefault // RGB888/RGBA8888 (Non-premultiplied to works for libwebp)
-        };
-        
-        convertor = vImageConverter_CreateWithCGImageFormat(&srcFormat, &destFormat, NULL, kvImageNoFlags, &error);
-        if (error != kvImageNoError) {
-            CFRelease(dataRef);
-            return nil;
-        }
-        
-        vImage_Buffer src = {
-            .data = (uint8_t *)CFDataGetBytePtr(dataRef),
-            .width = width,
-            .height = height,
-            .rowBytes = bytesPerRow
-        };
-        vImage_Buffer dest;
-        
-        error = vImageBuffer_Init(&dest, height, width, destFormat.bitsPerPixel, kvImageNoFlags);
-        if (error != kvImageNoError) {
-            CFRelease(dataRef);
-            return nil;
-        }
-        
-        // Convert input color mode to RGB888/RGBA8888
-        error = vImageConvert_AnyToAny(convertor, &src, &dest, NULL, kvImageNoFlags);
-        if (error != kvImageNoError) {
-            CFRelease(dataRef);
-            return nil;
-        }
-        
-        rgba = dest.data; // Converted buffer
-        bytesPerRow = dest.rowBytes; // Converted bytePerRow
-        CFRelease(dataRef);
-        dataRef = NULL;
-    }
-    
-    uint8_t *data = NULL; // Output WebP data
-    float qualityFactor = 100; // WebP quality is 0-100
-    // Encode RGB888/RGBA8888 buffer to WebP data
-    size_t size;
-    if (hasAlpha) {
-        size = WebPEncodeRGBA(rgba, (int)width, (int)height, (int)bytesPerRow, qualityFactor, &data);
-    } else {
-        size = WebPEncodeRGB(rgba, (int)width, (int)height, (int)bytesPerRow, qualityFactor, &data);
-    }
-    if (dataRef) {
-        CFRelease(dataRef); // free non-converted rgba buffer
-        dataRef = NULL;
-    } else {
-        free(rgba); // free converted rgba buffer
-        rgba = NULL;
-    }
-    
-    if (size) {
-        // success
-        webpData = [NSData dataWithBytes:data length:size];
-    }
-    if (data) {
-        WebPFree(data);
-    }
-    
-    return webpData;
-}
-
-static void FreeImageData(void *info, const void *data, size_t size) {
-    free((void *)data);
-}
-
-@end
-
-#endif
diff --git a/SDWebImage/UIButton+WebCache.m b/SDWebImage/UIButton+WebCache.m
deleted file mode 100644
index 8cdadb678..000000000
--- a/SDWebImage/UIButton+WebCache.m
+++ /dev/null
@@ -1,181 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "UIButton+WebCache.h"
-
-#if SD_UIKIT
-
-#import "objc/runtime.h"
-#import "UIView+WebCacheOperation.h"
-#import "UIView+WebCache.h"
-
-static char imageURLStorageKey;
-
-typedef NSMutableDictionary<NSString *, NSURL *> SDStateImageURLDictionary;
-
-static inline NSString * imageURLKeyForState(UIControlState state) {
-    return [NSString stringWithFormat:@"image_%lu", (unsigned long)state];
-}
-
-static inline NSString * backgroundImageURLKeyForState(UIControlState state) {
-    return [NSString stringWithFormat:@"backgroundImage_%lu", (unsigned long)state];
-}
-
-static inline NSString * imageOperationKeyForState(UIControlState state) {
-    return [NSString stringWithFormat:@"UIButtonImageOperation%lu", (unsigned long)state];
-}
-
-static inline NSString * backgroundImageOperationKeyForState(UIControlState state) {
-    return [NSString stringWithFormat:@"UIButtonBackgroundImageOperation%lu", (unsigned long)state];
-}
-
-@implementation UIButton (WebCache)
-
-#pragma mark - Image
-
-- (nullable NSURL *)sd_currentImageURL {
-    NSURL *url = self.sd_imageURLStorage[imageURLKeyForState(self.state)];
-
-    if (!url) {
-        url = self.sd_imageURLStorage[imageURLKeyForState(UIControlStateNormal)];
-    }
-
-    return url;
-}
-
-- (nullable NSURL *)sd_imageURLForState:(UIControlState)state {
-    return self.sd_imageURLStorage[imageURLKeyForState(state)];
-}
-
-- (void)sd_setImageWithURL:(nullable NSURL *)url forState:(UIControlState)state {
-    [self sd_setImageWithURL:url forState:state placeholderImage:nil options:0 completed:nil];
-}
-
-- (void)sd_setImageWithURL:(nullable NSURL *)url forState:(UIControlState)state placeholderImage:(nullable UIImage *)placeholder {
-    [self sd_setImageWithURL:url forState:state placeholderImage:placeholder options:0 completed:nil];
-}
-
-- (void)sd_setImageWithURL:(nullable NSURL *)url forState:(UIControlState)state placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options {
-    [self sd_setImageWithURL:url forState:state placeholderImage:placeholder options:options completed:nil];
-}
-
-- (void)sd_setImageWithURL:(nullable NSURL *)url forState:(UIControlState)state completed:(nullable SDExternalCompletionBlock)completedBlock {
-    [self sd_setImageWithURL:url forState:state placeholderImage:nil options:0 completed:completedBlock];
-}
-
-- (void)sd_setImageWithURL:(nullable NSURL *)url forState:(UIControlState)state placeholderImage:(nullable UIImage *)placeholder completed:(nullable SDExternalCompletionBlock)completedBlock {
-    [self sd_setImageWithURL:url forState:state placeholderImage:placeholder options:0 completed:completedBlock];
-}
-
-- (void)sd_setImageWithURL:(nullable NSURL *)url
-                  forState:(UIControlState)state
-          placeholderImage:(nullable UIImage *)placeholder
-                   options:(SDWebImageOptions)options
-                 completed:(nullable SDExternalCompletionBlock)completedBlock {
-    if (!url) {
-        [self.sd_imageURLStorage removeObjectForKey:imageURLKeyForState(state)];
-    } else {
-        self.sd_imageURLStorage[imageURLKeyForState(state)] = url;
-    }
-    
-    __weak typeof(self)weakSelf = self;
-    [self sd_internalSetImageWithURL:url
-                    placeholderImage:placeholder
-                             options:options
-                        operationKey:imageOperationKeyForState(state)
-                       setImageBlock:^(UIImage *image, NSData *imageData) {
-                           [weakSelf setImage:image forState:state];
-                       }
-                            progress:nil
-                           completed:completedBlock];
-}
-
-#pragma mark - Background Image
-
-- (nullable NSURL *)sd_currentBackgroundImageURL {
-    NSURL *url = self.sd_imageURLStorage[backgroundImageURLKeyForState(self.state)];
-    
-    if (!url) {
-        url = self.sd_imageURLStorage[backgroundImageURLKeyForState(UIControlStateNormal)];
-    }
-    
-    return url;
-}
-
-- (nullable NSURL *)sd_backgroundImageURLForState:(UIControlState)state {
-    return self.sd_imageURLStorage[backgroundImageURLKeyForState(state)];
-}
-
-- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url forState:(UIControlState)state {
-    [self sd_setBackgroundImageWithURL:url forState:state placeholderImage:nil options:0 completed:nil];
-}
-
-- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url forState:(UIControlState)state placeholderImage:(nullable UIImage *)placeholder {
-    [self sd_setBackgroundImageWithURL:url forState:state placeholderImage:placeholder options:0 completed:nil];
-}
-
-- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url forState:(UIControlState)state placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options {
-    [self sd_setBackgroundImageWithURL:url forState:state placeholderImage:placeholder options:options completed:nil];
-}
-
-- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url forState:(UIControlState)state completed:(nullable SDExternalCompletionBlock)completedBlock {
-    [self sd_setBackgroundImageWithURL:url forState:state placeholderImage:nil options:0 completed:completedBlock];
-}
-
-- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url forState:(UIControlState)state placeholderImage:(nullable UIImage *)placeholder completed:(nullable SDExternalCompletionBlock)completedBlock {
-    [self sd_setBackgroundImageWithURL:url forState:state placeholderImage:placeholder options:0 completed:completedBlock];
-}
-
-- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url
-                            forState:(UIControlState)state
-                    placeholderImage:(nullable UIImage *)placeholder
-                             options:(SDWebImageOptions)options
-                           completed:(nullable SDExternalCompletionBlock)completedBlock {
-    if (!url) {
-        [self.sd_imageURLStorage removeObjectForKey:backgroundImageURLKeyForState(state)];
-    } else {
-        self.sd_imageURLStorage[backgroundImageURLKeyForState(state)] = url;
-    }
-    
-    __weak typeof(self)weakSelf = self;
-    [self sd_internalSetImageWithURL:url
-                    placeholderImage:placeholder
-                             options:options
-                        operationKey:backgroundImageOperationKeyForState(state)
-                       setImageBlock:^(UIImage *image, NSData *imageData) {
-                           [weakSelf setBackgroundImage:image forState:state];
-                       }
-                            progress:nil
-                           completed:completedBlock];
-}
-
-#pragma mark - Cancel
-
-- (void)sd_cancelImageLoadForState:(UIControlState)state {
-    [self sd_cancelImageLoadOperationWithKey:imageOperationKeyForState(state)];
-}
-
-- (void)sd_cancelBackgroundImageLoadForState:(UIControlState)state {
-    [self sd_cancelImageLoadOperationWithKey:backgroundImageOperationKeyForState(state)];
-}
-
-#pragma mark - Private
-
-- (SDStateImageURLDictionary *)sd_imageURLStorage {
-    SDStateImageURLDictionary *storage = objc_getAssociatedObject(self, &imageURLStorageKey);
-    if (!storage) {
-        storage = [NSMutableDictionary dictionary];
-        objc_setAssociatedObject(self, &imageURLStorageKey, storage, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
-    }
-
-    return storage;
-}
-
-@end
-
-#endif
diff --git a/SDWebImage/UIImage+ForceDecode.m b/SDWebImage/UIImage+ForceDecode.m
deleted file mode 100644
index ee55aee71..000000000
--- a/SDWebImage/UIImage+ForceDecode.m
+++ /dev/null
@@ -1,30 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "UIImage+ForceDecode.h"
-#import "SDWebImageCodersManager.h"
-
-@implementation UIImage (ForceDecode)
-
-+ (UIImage *)decodedImageWithImage:(UIImage *)image {
-    if (!image) {
-        return nil;
-    }
-    NSData *tempData;
-    return [[SDWebImageCodersManager sharedInstance] decompressedImageWithImage:image data:&tempData options:@{SDWebImageCoderScaleDownLargeImagesKey: @(NO)}];
-}
-
-+ (UIImage *)decodedAndScaledDownImageWithImage:(UIImage *)image {
-    if (!image) {
-        return nil;
-    }
-    NSData *tempData;
-    return [[SDWebImageCodersManager sharedInstance] decompressedImageWithImage:image data:&tempData options:@{SDWebImageCoderScaleDownLargeImagesKey: @(YES)}];
-}
-
-@end
diff --git a/SDWebImage/UIImage+GIF.h b/SDWebImage/UIImage+GIF.h
deleted file mode 100644
index a3a664656..000000000
--- a/SDWebImage/UIImage+GIF.h
+++ /dev/null
@@ -1,25 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- * (c) Laurin Brandner
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "SDWebImageCompat.h"
-
-@interface UIImage (GIF)
-
-/**
- *  Creates an animated UIImage from an NSData.
- *  For static GIF, will create an UIImage with `images` array set to nil. For animated GIF, will create an UIImage with valid `images` array.
- */
-+ (UIImage *)sd_animatedGIFWithData:(NSData *)data;
-
-/**
- *  Checks if an UIImage instance is a GIF. Will use the `images` array.
- */
-- (BOOL)isGIF;
-
-@end
diff --git a/SDWebImage/UIImage+MultiFormat.h b/SDWebImage/UIImage+MultiFormat.h
deleted file mode 100644
index 5c6f473c1..000000000
--- a/SDWebImage/UIImage+MultiFormat.h
+++ /dev/null
@@ -1,37 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "SDWebImageCompat.h"
-#import "NSData+ImageContentType.h"
-
-@interface UIImage (MultiFormat)
-
-/**
- * UIKit:
- * For static image format, this value is always 0.
- * For animated image format, 0 means infinite looping.
- * @note Note that because of the limitations of categories this property can get out of sync if you create another instance with CGImage or other methods.
- * AppKit:
- * NSImage currently only support animated via GIF imageRep unlike UIImage.
- * The getter of this property will get the loop count from GIF imageRep
- * The setter of this property will set the loop count from GIF imageRep
- */
-@property (nonatomic, assign) NSUInteger sd_imageLoopCount;
-
-/**
- * The image format represent the original compressed image data format.
- * If you don't manually specify a format, this information is retrieve from CGImage using `CGImageGetUTType`, which may return nil for non-CG based image. At this time it will return `SDImageFormatUndefined` as default value.
- * @note Note that because of the limitations of categories this property can get out of sync if you create another instance with CGImage or other methods.
- */
-@property (nonatomic, assign) SDImageFormat sd_imageFormat;
-
-+ (nullable UIImage *)sd_imageWithData:(nullable NSData *)data;
-- (nullable NSData *)sd_imageData;
-- (nullable NSData *)sd_imageDataAsFormat:(SDImageFormat)imageFormat;
-
-@end
diff --git a/SDWebImage/UIImage+MultiFormat.m b/SDWebImage/UIImage+MultiFormat.m
deleted file mode 100644
index d3198d2da..000000000
--- a/SDWebImage/UIImage+MultiFormat.m
+++ /dev/null
@@ -1,95 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "UIImage+MultiFormat.h"
-#import "NSImage+WebCache.h"
-#import "SDWebImageCodersManager.h"
-#import "objc/runtime.h"
-
-@implementation UIImage (MultiFormat)
-
-#if SD_MAC
-- (NSUInteger)sd_imageLoopCount {
-    NSUInteger imageLoopCount = 0;
-    for (NSImageRep *rep in self.representations) {
-        if ([rep isKindOfClass:[NSBitmapImageRep class]]) {
-            NSBitmapImageRep *bitmapRep = (NSBitmapImageRep *)rep;
-            imageLoopCount = [[bitmapRep valueForProperty:NSImageLoopCount] unsignedIntegerValue];
-            break;
-        }
-    }
-    return imageLoopCount;
-}
-
-- (void)setSd_imageLoopCount:(NSUInteger)sd_imageLoopCount {
-    for (NSImageRep *rep in self.representations) {
-        if ([rep isKindOfClass:[NSBitmapImageRep class]]) {
-            NSBitmapImageRep *bitmapRep = (NSBitmapImageRep *)rep;
-            [bitmapRep setProperty:NSImageLoopCount withValue:@(sd_imageLoopCount)];
-            break;
-        }
-    }
-}
-
-#else
-
-- (NSUInteger)sd_imageLoopCount {
-    NSUInteger imageLoopCount = 0;
-    NSNumber *value = objc_getAssociatedObject(self, @selector(sd_imageLoopCount));
-    if ([value isKindOfClass:[NSNumber class]]) {
-        imageLoopCount = value.unsignedIntegerValue;
-    }
-    return imageLoopCount;
-}
-
-- (void)setSd_imageLoopCount:(NSUInteger)sd_imageLoopCount {
-    NSNumber *value = @(sd_imageLoopCount);
-    objc_setAssociatedObject(self, @selector(sd_imageLoopCount), value, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
-}
-#endif
-
-- (SDImageFormat)sd_imageFormat {
-    SDImageFormat imageFormat = SDImageFormatUndefined;
-    NSNumber *value = objc_getAssociatedObject(self, @selector(sd_imageFormat));
-    if ([value isKindOfClass:[NSNumber class]]) {
-        imageFormat = value.integerValue;
-        return imageFormat;
-    }
-    // Check CGImage's UTType, may return nil for non-Image/IO based image
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wunguarded-availability"
-    if (&CGImageGetUTType != NULL) {
-        CFStringRef uttype = CGImageGetUTType(self.CGImage);
-        imageFormat = [NSData sd_imageFormatFromUTType:uttype];
-    }
-#pragma clang diagnostic pop
-    return imageFormat;
-}
-
-- (void)setSd_imageFormat:(SDImageFormat)sd_imageFormat {
-    objc_setAssociatedObject(self, @selector(sd_imageFormat), @(sd_imageFormat), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
-}
-
-+ (nullable UIImage *)sd_imageWithData:(nullable NSData *)data {
-    return [[SDWebImageCodersManager sharedInstance] decodedImageWithData:data];
-}
-
-- (nullable NSData *)sd_imageData {
-    return [self sd_imageDataAsFormat:SDImageFormatUndefined];
-}
-
-- (nullable NSData *)sd_imageDataAsFormat:(SDImageFormat)imageFormat {
-    NSData *imageData = nil;
-    if (self) {
-        imageData = [[SDWebImageCodersManager sharedInstance] encodedDataWithImage:self format:imageFormat];
-    }
-    return imageData;
-}
-
-
-@end
diff --git a/SDWebImage/UIImage+WebP.h b/SDWebImage/UIImage+WebP.h
deleted file mode 100644
index 139eebd39..000000000
--- a/SDWebImage/UIImage+WebP.h
+++ /dev/null
@@ -1,30 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#ifdef SD_WEBP
-
-#import "SDWebImageCompat.h"
-
-@interface UIImage (WebP)
-
-/**
- * Get the current WebP image loop count, the default value is 0.
- * For static WebP image, the value is 0.
- * For animated WebP image, 0 means repeat the animation indefinitely.
- * Note that because of the limitations of categories this property can get out of sync
- * if you create another instance with CGImage or other methods.
- * @return WebP image loop count
- * @deprecated use `sd_imageLoopCount` instead.
- */
-- (NSInteger)sd_webpLoopCount __deprecated_msg("Method deprecated. Use `sd_imageLoopCount` in `UIImage+MultiFormat.h`");
-
-+ (nullable UIImage *)sd_imageWithWebPData:(nullable NSData *)data;
-
-@end
-
-#endif
diff --git a/SDWebImage/UIImage+WebP.m b/SDWebImage/UIImage+WebP.m
deleted file mode 100644
index 0c4a9c5c2..000000000
--- a/SDWebImage/UIImage+WebP.m
+++ /dev/null
@@ -1,30 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#ifdef SD_WEBP
-
-#import "UIImage+WebP.h"
-#import "SDWebImageWebPCoder.h"
-#import "UIImage+MultiFormat.h"
-
-@implementation UIImage (WebP)
-
-- (NSInteger)sd_webpLoopCount {
-    return self.sd_imageLoopCount;
-}
-
-+ (nullable UIImage *)sd_imageWithWebPData:(nullable NSData *)data {
-    if (!data) {
-        return nil;
-    }
-    return [[SDWebImageWebPCoder sharedCoder] decodedImageWithData:data];
-}
-
-@end
-
-#endif
diff --git a/SDWebImage/UIImageView+HighlightedWebCache.m b/SDWebImage/UIImageView+HighlightedWebCache.m
deleted file mode 100644
index fb13bd8b1..000000000
--- a/SDWebImage/UIImageView+HighlightedWebCache.m
+++ /dev/null
@@ -1,52 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "UIImageView+HighlightedWebCache.h"
-
-#if SD_UIKIT
-
-#import "UIView+WebCacheOperation.h"
-#import "UIView+WebCache.h"
-
-@implementation UIImageView (HighlightedWebCache)
-
-- (void)sd_setHighlightedImageWithURL:(nullable NSURL *)url {
-    [self sd_setHighlightedImageWithURL:url options:0 progress:nil completed:nil];
-}
-
-- (void)sd_setHighlightedImageWithURL:(nullable NSURL *)url options:(SDWebImageOptions)options {
-    [self sd_setHighlightedImageWithURL:url options:options progress:nil completed:nil];
-}
-
-- (void)sd_setHighlightedImageWithURL:(nullable NSURL *)url completed:(nullable SDExternalCompletionBlock)completedBlock {
-    [self sd_setHighlightedImageWithURL:url options:0 progress:nil completed:completedBlock];
-}
-
-- (void)sd_setHighlightedImageWithURL:(nullable NSURL *)url options:(SDWebImageOptions)options completed:(nullable SDExternalCompletionBlock)completedBlock {
-    [self sd_setHighlightedImageWithURL:url options:options progress:nil completed:completedBlock];
-}
-
-- (void)sd_setHighlightedImageWithURL:(nullable NSURL *)url
-                              options:(SDWebImageOptions)options
-                             progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
-                            completed:(nullable SDExternalCompletionBlock)completedBlock {
-    __weak typeof(self)weakSelf = self;
-    [self sd_internalSetImageWithURL:url
-                    placeholderImage:nil
-                             options:options
-                        operationKey:@"UIImageViewImageOperationHighlighted"
-                       setImageBlock:^(UIImage *image, NSData *imageData) {
-                           weakSelf.highlightedImage = image;
-                       }
-                            progress:progressBlock
-                           completed:completedBlock];
-}
-
-@end
-
-#endif
diff --git a/SDWebImage/UIImageView+WebCache.m b/SDWebImage/UIImageView+WebCache.m
deleted file mode 100644
index 1baea5d99..000000000
--- a/SDWebImage/UIImageView+WebCache.m
+++ /dev/null
@@ -1,139 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "UIImageView+WebCache.h"
-#import "objc/runtime.h"
-#import "UIView+WebCacheOperation.h"
-#import "UIView+WebCache.h"
-
-@implementation UIImageView (WebCache)
-
-- (void)sd_setImageWithURL:(nullable NSURL *)url {
-    [self sd_setImageWithURL:url placeholderImage:nil options:0 progress:nil completed:nil];
-}
-
-- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder {
-    [self sd_setImageWithURL:url placeholderImage:placeholder options:0 progress:nil completed:nil];
-}
-
-- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options {
-    [self sd_setImageWithURL:url placeholderImage:placeholder options:options progress:nil completed:nil];
-}
-
-- (void)sd_setImageWithURL:(nullable NSURL *)url completed:(nullable SDExternalCompletionBlock)completedBlock {
-    [self sd_setImageWithURL:url placeholderImage:nil options:0 progress:nil completed:completedBlock];
-}
-
-- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder completed:(nullable SDExternalCompletionBlock)completedBlock {
-    [self sd_setImageWithURL:url placeholderImage:placeholder options:0 progress:nil completed:completedBlock];
-}
-
-- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options completed:(nullable SDExternalCompletionBlock)completedBlock {
-    [self sd_setImageWithURL:url placeholderImage:placeholder options:options progress:nil completed:completedBlock];
-}
-
-- (void)sd_setImageWithURL:(nullable NSURL *)url
-          placeholderImage:(nullable UIImage *)placeholder
-                   options:(SDWebImageOptions)options
-                  progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
-                 completed:(nullable SDExternalCompletionBlock)completedBlock {
-    [self sd_internalSetImageWithURL:url
-                    placeholderImage:placeholder
-                             options:options
-                        operationKey:nil
-                       setImageBlock:nil
-                            progress:progressBlock
-                           completed:completedBlock];
-}
-
-- (void)sd_setImageWithPreviousCachedImageWithURL:(nullable NSURL *)url
-                                 placeholderImage:(nullable UIImage *)placeholder
-                                          options:(SDWebImageOptions)options
-                                         progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
-                                        completed:(nullable SDExternalCompletionBlock)completedBlock {
-    NSString *key = [[SDWebImageManager sharedManager] cacheKeyForURL:url];
-    UIImage *lastPreviousCachedImage = [[SDImageCache sharedImageCache] imageFromCacheForKey:key];
-    
-    [self sd_setImageWithURL:url placeholderImage:lastPreviousCachedImage ?: placeholder options:options progress:progressBlock completed:completedBlock];    
-}
-
-#if SD_UIKIT
-
-#pragma mark - Animation of multiple images
-
-- (void)sd_setAnimationImagesWithURLs:(nonnull NSArray<NSURL *> *)arrayOfURLs {
-    [self sd_cancelCurrentAnimationImagesLoad];
-    NSPointerArray *operationsArray = [self sd_animationOperationArray];
-    
-    [arrayOfURLs enumerateObjectsUsingBlock:^(NSURL *logoImageURL, NSUInteger idx, BOOL * _Nonnull stop) {
-        __weak __typeof(self) wself = self;
-        id <SDWebImageOperation> operation = [[SDWebImageManager sharedManager] loadImageWithURL:logoImageURL options:0 progress:nil completed:^(UIImage *image, NSData *data, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {
-            __strong typeof(wself) sself = wself;
-            if (!sself) return;
-            dispatch_main_async_safe(^{
-                [sself stopAnimating];
-                if (sself && image) {
-                    NSMutableArray<UIImage *> *currentImages = [[sself animationImages] mutableCopy];
-                    if (!currentImages) {
-                        currentImages = [[NSMutableArray alloc] init];
-                    }
-                    
-                    // We know what index objects should be at when they are returned so
-                    // we will put the object at the index, filling any empty indexes
-                    // with the image that was returned too "early". These images will
-                    // be overwritten. (does not require additional sorting datastructure)
-                    while ([currentImages count] < idx) {
-                        [currentImages addObject:image];
-                    }
-                    
-                    currentImages[idx] = image;
-
-                    sself.animationImages = currentImages;
-                    [sself setNeedsLayout];
-                }
-                [sself startAnimating];
-            });
-        }];
-        @synchronized (self) {
-            [operationsArray addPointer:(__bridge void *)(operation)];
-        }
-    }];
-}
-
-static char animationLoadOperationKey;
-
-// element is weak because operation instance is retained by SDWebImageManager's runningOperations property
-// we should use lock to keep thread-safe because these method may not be acessed from main queue
-- (NSPointerArray *)sd_animationOperationArray {
-    @synchronized(self) {
-        NSPointerArray *operationsArray = objc_getAssociatedObject(self, &animationLoadOperationKey);
-        if (operationsArray) {
-            return operationsArray;
-        }
-        operationsArray = [NSPointerArray weakObjectsPointerArray];
-        objc_setAssociatedObject(self, &animationLoadOperationKey, operationsArray, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
-        return operationsArray;
-    }
-}
-
-- (void)sd_cancelCurrentAnimationImagesLoad {
-    NSPointerArray *operationsArray = [self sd_animationOperationArray];
-    if (operationsArray) {
-        @synchronized (self) {
-            for (id operation in operationsArray) {
-                if ([operation conformsToProtocol:@protocol(SDWebImageOperation)]) {
-                    [operation cancel];
-                }
-            }
-            operationsArray.count = 0;
-        }
-    }
-}
-#endif
-
-@end
diff --git a/SDWebImage/UIView+WebCache.h b/SDWebImage/UIView+WebCache.h
deleted file mode 100644
index 026f1b3c2..000000000
--- a/SDWebImage/UIView+WebCache.h
+++ /dev/null
@@ -1,139 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "SDWebImageCompat.h"
-#import "SDWebImageManager.h"
-#import "SDWebImageTransition.h"
-
-/**
- A Dispatch group to maintain setImageBlock and completionBlock. This key should be used only internally and may be changed in the future. (dispatch_group_t)
- */
-FOUNDATION_EXPORT NSString * _Nonnull const SDWebImageInternalSetImageGroupKey __deprecated_msg("Key Deprecated. Does nothing. This key should be used only internally");
-/**
- A SDWebImageManager instance to control the image download and cache process using in UIImageView+WebCache category and likes. If not provided, use the shared manager (SDWebImageManager)
- */
-FOUNDATION_EXPORT NSString * _Nonnull const SDWebImageExternalCustomManagerKey;
-/**
- The value specify that the image progress unit count cannot be determined because the progressBlock is not been called.
- */
-FOUNDATION_EXPORT const int64_t SDWebImageProgressUnitCountUnknown; /* 1LL */
-
-typedef void(^SDSetImageBlock)(UIImage * _Nullable image, NSData * _Nullable imageData);
-
-@interface UIView (WebCache)
-
-/**
- * Get the current image URL.
- *
- * @note Note that because of the limitations of categories this property can get out of sync if you use setImage: directly.
- */
-- (nullable NSURL *)sd_imageURL;
-
-/**
- * The current image loading progress associated to the view. The unit count is the received size and excepted size of download.
- * The `totalUnitCount` and `completedUnitCount` will be reset to 0 after a new image loading start (change from current queue). And they will be set to `SDWebImageProgressUnitCountUnknown` if the progressBlock not been called but the image loading success to mark the progress finished (change from main queue).
- * @note You can use Key-Value Observing on the progress, but you should take care that the change to progress is from a background queue during download(the same as progressBlock). If you want to using KVO and update the UI, make sure to dispatch on the main queue. And it's recommand to use some KVO libs like KVOController because it's more safe and easy to use.
- * @note The getter will create a progress instance if the value is nil. You can also set a custom progress instance and let it been updated during image loading
- * @note Note that because of the limitations of categories this property can get out of sync if you update the progress directly.
- */
-@property (nonatomic, strong, null_resettable) NSProgress *sd_imageProgress;
-
-/**
- * Set the imageView `image` with an `url` and optionally a placeholder image.
- *
- * The download is asynchronous and cached.
- *
- * @param url            The url for the image.
- * @param placeholder    The image to be set initially, until the image request finishes.
- * @param options        The options to use when downloading the image. @see SDWebImageOptions for the possible values.
- * @param operationKey   A string to be used as the operation key. If nil, will use the class name
- * @param setImageBlock  Block used for custom set image code
- * @param progressBlock  A block called while image is downloading
- *                       @note the progress block is executed on a background queue
- * @param completedBlock A block called when operation has been completed. This block has no return value
- *                       and takes the requested UIImage as first parameter. In case of error the image parameter
- *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
- *                       indicating if the image was retrieved from the local cache or from the network.
- *                       The fourth parameter is the original image url.
- */
-- (void)sd_internalSetImageWithURL:(nullable NSURL *)url
-                  placeholderImage:(nullable UIImage *)placeholder
-                           options:(SDWebImageOptions)options
-                      operationKey:(nullable NSString *)operationKey
-                     setImageBlock:(nullable SDSetImageBlock)setImageBlock
-                          progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
-                         completed:(nullable SDExternalCompletionBlock)completedBlock;
-
-/**
- * Set the imageView `image` with an `url` and optionally a placeholder image.
- *
- * The download is asynchronous and cached.
- *
- * @param url            The url for the image.
- * @param placeholder    The image to be set initially, until the image request finishes.
- * @param options        The options to use when downloading the image. @see SDWebImageOptions for the possible values.
- * @param operationKey   A string to be used as the operation key. If nil, will use the class name
- * @param setImageBlock  Block used for custom set image code
- * @param progressBlock  A block called while image is downloading
- *                       @note the progress block is executed on a background queue
- * @param completedBlock A block called when operation has been completed. This block has no return value
- *                       and takes the requested UIImage as first parameter. In case of error the image parameter
- *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
- *                       indicating if the image was retrieved from the local cache or from the network.
- *                       The fourth parameter is the original image url.
- * @param context        A context with extra information to perform specify changes or processes.
- */
-- (void)sd_internalSetImageWithURL:(nullable NSURL *)url
-                  placeholderImage:(nullable UIImage *)placeholder
-                           options:(SDWebImageOptions)options
-                      operationKey:(nullable NSString *)operationKey
-                     setImageBlock:(nullable SDSetImageBlock)setImageBlock
-                          progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
-                         completed:(nullable SDExternalCompletionBlock)completedBlock
-                           context:(nullable NSDictionary<NSString *, id> *)context;
-
-/**
- * Cancel the current image load
- */
-- (void)sd_cancelCurrentImageLoad;
-
-#if SD_UIKIT || SD_MAC
-
-#pragma mark - Image Transition
-
-/**
- The image transition when image load finished. See `SDWebImageTransition`.
- If you specify nil, do not do transition. Defautls to nil.
- */
-@property (nonatomic, strong, nullable) SDWebImageTransition *sd_imageTransition;
-
-#if SD_UIKIT
-
-#pragma mark - Activity indicator
-
-/**
- *  Show activity UIActivityIndicatorView
- */
-- (void)sd_setShowActivityIndicatorView:(BOOL)show;
-
-/**
- *  set desired UIActivityIndicatorViewStyle
- *
- *  @param style The style of the UIActivityIndicatorView
- */
-- (void)sd_setIndicatorStyle:(UIActivityIndicatorViewStyle)style;
-
-- (BOOL)sd_showActivityIndicatorView;
-- (void)sd_addActivityIndicator;
-- (void)sd_removeActivityIndicator;
-
-#endif
-
-#endif
-
-@end
diff --git a/SDWebImage/UIView+WebCache.m b/SDWebImage/UIView+WebCache.m
deleted file mode 100644
index 88def7592..000000000
--- a/SDWebImage/UIView+WebCache.m
+++ /dev/null
@@ -1,349 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "UIView+WebCache.h"
-#import "objc/runtime.h"
-#import "UIView+WebCacheOperation.h"
-
-NSString * const SDWebImageInternalSetImageGroupKey = @"internalSetImageGroup";
-NSString * const SDWebImageExternalCustomManagerKey = @"externalCustomManager";
-
-const int64_t SDWebImageProgressUnitCountUnknown = 1LL;
-
-static char imageURLKey;
-
-#if SD_UIKIT
-static char TAG_ACTIVITY_INDICATOR;
-static char TAG_ACTIVITY_STYLE;
-static char TAG_ACTIVITY_SHOW;
-#endif
-
-@implementation UIView (WebCache)
-
-- (nullable NSURL *)sd_imageURL {
-    return objc_getAssociatedObject(self, &imageURLKey);
-}
-
-- (NSProgress *)sd_imageProgress {
-    NSProgress *progress = objc_getAssociatedObject(self, @selector(sd_imageProgress));
-    if (!progress) {
-        progress = [[NSProgress alloc] initWithParent:nil userInfo:nil];
-        self.sd_imageProgress = progress;
-    }
-    return progress;
-}
-
-- (void)setSd_imageProgress:(NSProgress *)sd_imageProgress {
-    objc_setAssociatedObject(self, @selector(sd_imageProgress), sd_imageProgress, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
-}
-
-- (void)sd_internalSetImageWithURL:(nullable NSURL *)url
-                  placeholderImage:(nullable UIImage *)placeholder
-                           options:(SDWebImageOptions)options
-                      operationKey:(nullable NSString *)operationKey
-                     setImageBlock:(nullable SDSetImageBlock)setImageBlock
-                          progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
-                         completed:(nullable SDExternalCompletionBlock)completedBlock {
-    return [self sd_internalSetImageWithURL:url placeholderImage:placeholder options:options operationKey:operationKey setImageBlock:setImageBlock progress:progressBlock completed:completedBlock context:nil];
-}
-
-- (void)sd_internalSetImageWithURL:(nullable NSURL *)url
-                  placeholderImage:(nullable UIImage *)placeholder
-                           options:(SDWebImageOptions)options
-                      operationKey:(nullable NSString *)operationKey
-                     setImageBlock:(nullable SDSetImageBlock)setImageBlock
-                          progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
-                         completed:(nullable SDExternalCompletionBlock)completedBlock
-                           context:(nullable NSDictionary<NSString *, id> *)context {
-    NSString *validOperationKey = operationKey ?: NSStringFromClass([self class]);
-    [self sd_cancelImageLoadOperationWithKey:validOperationKey];
-    objc_setAssociatedObject(self, &imageURLKey, url, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
-    
-    if (!(options & SDWebImageDelayPlaceholder)) {
-        dispatch_main_async_safe(^{
-            [self sd_setImage:placeholder imageData:nil basedOnClassOrViaCustomSetImageBlock:setImageBlock];
-        });
-    }
-    
-    if (url) {
-#if SD_UIKIT
-        // check if activityView is enabled or not
-        if ([self sd_showActivityIndicatorView]) {
-            [self sd_addActivityIndicator];
-        }
-#endif
-        
-        // reset the progress
-        self.sd_imageProgress.totalUnitCount = 0;
-        self.sd_imageProgress.completedUnitCount = 0;
-        
-        SDWebImageManager *manager = [context objectForKey:SDWebImageExternalCustomManagerKey];
-        if (!manager) {
-            manager = [SDWebImageManager sharedManager];
-        }
-        
-        __weak __typeof(self)wself = self;
-        SDWebImageDownloaderProgressBlock combinedProgressBlock = ^(NSInteger receivedSize, NSInteger expectedSize, NSURL * _Nullable targetURL) {
-            wself.sd_imageProgress.totalUnitCount = expectedSize;
-            wself.sd_imageProgress.completedUnitCount = receivedSize;
-            if (progressBlock) {
-                progressBlock(receivedSize, expectedSize, targetURL);
-            }
-        };
-        id <SDWebImageOperation> operation = [manager loadImageWithURL:url options:options progress:combinedProgressBlock completed:^(UIImage *image, NSData *data, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {
-            __strong __typeof (wself) sself = wself;
-            if (!sself) { return; }
-#if SD_UIKIT
-            [sself sd_removeActivityIndicator];
-#endif
-            // if the progress not been updated, mark it to complete state
-            if (finished && !error && sself.sd_imageProgress.totalUnitCount == 0 && sself.sd_imageProgress.completedUnitCount == 0) {
-                sself.sd_imageProgress.totalUnitCount = SDWebImageProgressUnitCountUnknown;
-                sself.sd_imageProgress.completedUnitCount = SDWebImageProgressUnitCountUnknown;
-            }
-            BOOL shouldCallCompletedBlock = finished || (options & SDWebImageAvoidAutoSetImage);
-            BOOL shouldNotSetImage = ((image && (options & SDWebImageAvoidAutoSetImage)) ||
-                                      (!image && !(options & SDWebImageDelayPlaceholder)));
-            SDWebImageNoParamsBlock callCompletedBlockClojure = ^{
-                if (!sself) { return; }
-                if (!shouldNotSetImage) {
-                    [sself sd_setNeedsLayout];
-                }
-                if (completedBlock && shouldCallCompletedBlock) {
-                    completedBlock(image, error, cacheType, url);
-                }
-            };
-            
-            // case 1a: we got an image, but the SDWebImageAvoidAutoSetImage flag is set
-            // OR
-            // case 1b: we got no image and the SDWebImageDelayPlaceholder is not set
-            if (shouldNotSetImage) {
-                dispatch_main_async_safe(callCompletedBlockClojure);
-                return;
-            }
-            
-            UIImage *targetImage = nil;
-            NSData *targetData = nil;
-            if (image) {
-                // case 2a: we got an image and the SDWebImageAvoidAutoSetImage is not set
-                targetImage = image;
-                targetData = data;
-            } else if (options & SDWebImageDelayPlaceholder) {
-                // case 2b: we got no image and the SDWebImageDelayPlaceholder flag is set
-                targetImage = placeholder;
-                targetData = nil;
-            }
-            
-#if SD_UIKIT || SD_MAC
-            // check whether we should use the image transition
-            SDWebImageTransition *transition = nil;
-            if (finished && (options & SDWebImageForceTransition || cacheType == SDImageCacheTypeNone)) {
-                transition = sself.sd_imageTransition;
-            }
-#endif
-            dispatch_main_async_safe(^{
-#if SD_UIKIT || SD_MAC
-                [sself sd_setImage:targetImage imageData:targetData basedOnClassOrViaCustomSetImageBlock:setImageBlock transition:transition cacheType:cacheType imageURL:imageURL];
-#else
-                [sself sd_setImage:targetImage imageData:targetData basedOnClassOrViaCustomSetImageBlock:setImageBlock];
-#endif
-                callCompletedBlockClojure();
-            });
-        }];
-        [self sd_setImageLoadOperation:operation forKey:validOperationKey];
-    } else {
-        dispatch_main_async_safe(^{
-#if SD_UIKIT
-            [self sd_removeActivityIndicator];
-#endif
-            if (completedBlock) {
-                NSError *error = [NSError errorWithDomain:SDWebImageErrorDomain code:-1 userInfo:@{NSLocalizedDescriptionKey : @"Trying to load a nil url"}];
-                completedBlock(nil, error, SDImageCacheTypeNone, url);
-            }
-        });
-    }
-}
-
-- (void)sd_cancelCurrentImageLoad {
-    [self sd_cancelImageLoadOperationWithKey:NSStringFromClass([self class])];
-}
-
-- (void)sd_setImage:(UIImage *)image imageData:(NSData *)imageData basedOnClassOrViaCustomSetImageBlock:(SDSetImageBlock)setImageBlock {
-#if SD_UIKIT || SD_MAC
-    [self sd_setImage:image imageData:imageData basedOnClassOrViaCustomSetImageBlock:setImageBlock transition:nil cacheType:0 imageURL:nil];
-#else
-    // watchOS does not support view transition. Simplify the logic
-    if (setImageBlock) {
-        setImageBlock(image, imageData);
-    } else if ([self isKindOfClass:[UIImageView class]]) {
-        UIImageView *imageView = (UIImageView *)self;
-        [imageView setImage:image];
-    }
-#endif
-}
-
-#if SD_UIKIT || SD_MAC
-- (void)sd_setImage:(UIImage *)image imageData:(NSData *)imageData basedOnClassOrViaCustomSetImageBlock:(SDSetImageBlock)setImageBlock transition:(SDWebImageTransition *)transition cacheType:(SDImageCacheType)cacheType imageURL:(NSURL *)imageURL {
-    UIView *view = self;
-    SDSetImageBlock finalSetImageBlock;
-    if (setImageBlock) {
-        finalSetImageBlock = setImageBlock;
-    } else if ([view isKindOfClass:[UIImageView class]]) {
-        UIImageView *imageView = (UIImageView *)view;
-        finalSetImageBlock = ^(UIImage *setImage, NSData *setImageData) {
-            imageView.image = setImage;
-        };
-    }
-#if SD_UIKIT
-    else if ([view isKindOfClass:[UIButton class]]) {
-        UIButton *button = (UIButton *)view;
-        finalSetImageBlock = ^(UIImage *setImage, NSData *setImageData){
-            [button setImage:setImage forState:UIControlStateNormal];
-        };
-    }
-#endif
-    
-    if (transition) {
-#if SD_UIKIT
-        [UIView transitionWithView:view duration:0 options:0 animations:^{
-            // 0 duration to let UIKit render placeholder and prepares block
-            if (transition.prepares) {
-                transition.prepares(view, image, imageData, cacheType, imageURL);
-            }
-        } completion:^(BOOL finished) {
-            [UIView transitionWithView:view duration:transition.duration options:transition.animationOptions animations:^{
-                if (finalSetImageBlock && !transition.avoidAutoSetImage) {
-                    finalSetImageBlock(image, imageData);
-                }
-                if (transition.animations) {
-                    transition.animations(view, image);
-                }
-            } completion:transition.completion];
-        }];
-#elif SD_MAC
-        [NSAnimationContext runAnimationGroup:^(NSAnimationContext * _Nonnull prepareContext) {
-            // 0 duration to let AppKit render placeholder and prepares block
-            prepareContext.duration = 0;
-            if (transition.prepares) {
-                transition.prepares(view, image, imageData, cacheType, imageURL);
-            }
-        } completionHandler:^{
-            [NSAnimationContext runAnimationGroup:^(NSAnimationContext * _Nonnull context) {
-                context.duration = transition.duration;
-                context.timingFunction = transition.timingFunction;
-                context.allowsImplicitAnimation = (transition.animationOptions & SDWebImageAnimationOptionAllowsImplicitAnimation);
-                if (finalSetImageBlock && !transition.avoidAutoSetImage) {
-                    finalSetImageBlock(image, imageData);
-                }
-                if (transition.animations) {
-                    transition.animations(view, image);
-                }
-            } completionHandler:^{
-                if (transition.completion) {
-                    transition.completion(YES);
-                }
-            }];
-        }];
-#endif
-    } else {
-        if (finalSetImageBlock) {
-            finalSetImageBlock(image, imageData);
-        }
-    }
-}
-#endif
-
-- (void)sd_setNeedsLayout {
-#if SD_UIKIT
-    [self setNeedsLayout];
-#elif SD_MAC
-    [self setNeedsLayout:YES];
-#elif SD_WATCH
-    // Do nothing because WatchKit automatically layout the view after property change
-#endif
-}
-
-#if SD_UIKIT || SD_MAC
-
-#pragma mark - Image Transition
-- (SDWebImageTransition *)sd_imageTransition {
-    return objc_getAssociatedObject(self, @selector(sd_imageTransition));
-}
-
-- (void)setSd_imageTransition:(SDWebImageTransition *)sd_imageTransition {
-    objc_setAssociatedObject(self, @selector(sd_imageTransition), sd_imageTransition, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
-}
-
-#if SD_UIKIT
-
-#pragma mark - Activity indicator
-- (UIActivityIndicatorView *)activityIndicator {
-    return (UIActivityIndicatorView *)objc_getAssociatedObject(self, &TAG_ACTIVITY_INDICATOR);
-}
-
-- (void)setActivityIndicator:(UIActivityIndicatorView *)activityIndicator {
-    objc_setAssociatedObject(self, &TAG_ACTIVITY_INDICATOR, activityIndicator, OBJC_ASSOCIATION_RETAIN);
-}
-
-- (void)sd_setShowActivityIndicatorView:(BOOL)show {
-    objc_setAssociatedObject(self, &TAG_ACTIVITY_SHOW, @(show), OBJC_ASSOCIATION_RETAIN);
-}
-
-- (BOOL)sd_showActivityIndicatorView {
-    return [objc_getAssociatedObject(self, &TAG_ACTIVITY_SHOW) boolValue];
-}
-
-- (void)sd_setIndicatorStyle:(UIActivityIndicatorViewStyle)style{
-    objc_setAssociatedObject(self, &TAG_ACTIVITY_STYLE, [NSNumber numberWithInt:style], OBJC_ASSOCIATION_RETAIN);
-}
-
-- (int)sd_getIndicatorStyle{
-    return [objc_getAssociatedObject(self, &TAG_ACTIVITY_STYLE) intValue];
-}
-
-- (void)sd_addActivityIndicator {
-    dispatch_main_async_safe(^{
-        if (!self.activityIndicator) {
-            self.activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:[self sd_getIndicatorStyle]];
-            self.activityIndicator.translatesAutoresizingMaskIntoConstraints = NO;
-        
-            [self addSubview:self.activityIndicator];
-            
-            [self addConstraint:[NSLayoutConstraint constraintWithItem:self.activityIndicator
-                                                             attribute:NSLayoutAttributeCenterX
-                                                             relatedBy:NSLayoutRelationEqual
-                                                                toItem:self
-                                                             attribute:NSLayoutAttributeCenterX
-                                                            multiplier:1.0
-                                                              constant:0.0]];
-            [self addConstraint:[NSLayoutConstraint constraintWithItem:self.activityIndicator
-                                                             attribute:NSLayoutAttributeCenterY
-                                                             relatedBy:NSLayoutRelationEqual
-                                                                toItem:self
-                                                             attribute:NSLayoutAttributeCenterY
-                                                            multiplier:1.0
-                                                              constant:0.0]];
-        }
-        [self.activityIndicator startAnimating];
-    });
-}
-
-- (void)sd_removeActivityIndicator {
-    dispatch_main_async_safe(^{
-        if (self.activityIndicator) {
-            [self.activityIndicator removeFromSuperview];
-            self.activityIndicator = nil;
-        }
-    });
-}
-
-#endif
-
-#endif
-
-@end
diff --git a/SDWebImage/UIView+WebCacheOperation.h b/SDWebImage/UIView+WebCacheOperation.h
deleted file mode 100644
index 0be284b68..000000000
--- a/SDWebImage/UIView+WebCacheOperation.h
+++ /dev/null
@@ -1,38 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "SDWebImageCompat.h"
-#import "SDWebImageOperation.h"
-
-// These methods are used to support canceling for UIView image loading, it's designed to be used internal but not external.
-// All the stored operations are weak, so it will be dalloced after image loading finished. If you need to store operations, use your own class to keep a strong reference for them.
-@interface UIView (WebCacheOperation)
-
-/**
- *  Set the image load operation (storage in a UIView based weak map table)
- *
- *  @param operation the operation
- *  @param key       key for storing the operation
- */
-- (void)sd_setImageLoadOperation:(nullable id<SDWebImageOperation>)operation forKey:(nullable NSString *)key;
-
-/**
- *  Cancel all operations for the current UIView and key
- *
- *  @param key key for identifying the operations
- */
-- (void)sd_cancelImageLoadOperationWithKey:(nullable NSString *)key;
-
-/**
- *  Just remove the operations corresponding to the current UIView and key without cancelling them
- *
- *  @param key key for identifying the operations
- */
-- (void)sd_removeImageLoadOperationWithKey:(nullable NSString *)key;
-
-@end
diff --git a/SDWebImage/UIView+WebCacheOperation.m b/SDWebImage/UIView+WebCacheOperation.m
deleted file mode 100644
index cd769be02..000000000
--- a/SDWebImage/UIView+WebCacheOperation.m
+++ /dev/null
@@ -1,73 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "UIView+WebCacheOperation.h"
-#import "objc/runtime.h"
-
-static char loadOperationKey;
-
-// key is copy, value is weak because operation instance is retained by SDWebImageManager's runningOperations property
-// we should use lock to keep thread-safe because these method may not be acessed from main queue
-typedef NSMapTable<NSString *, id<SDWebImageOperation>> SDOperationsDictionary;
-
-@implementation UIView (WebCacheOperation)
-
-- (SDOperationsDictionary *)sd_operationDictionary {
-    @synchronized(self) {
-        SDOperationsDictionary *operations = objc_getAssociatedObject(self, &loadOperationKey);
-        if (operations) {
-            return operations;
-        }
-        operations = [[NSMapTable alloc] initWithKeyOptions:NSPointerFunctionsStrongMemory valueOptions:NSPointerFunctionsWeakMemory capacity:0];
-        objc_setAssociatedObject(self, &loadOperationKey, operations, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
-        return operations;
-    }
-}
-
-- (void)sd_setImageLoadOperation:(nullable id<SDWebImageOperation>)operation forKey:(nullable NSString *)key {
-    if (key) {
-        [self sd_cancelImageLoadOperationWithKey:key];
-        if (operation) {
-            SDOperationsDictionary *operationDictionary = [self sd_operationDictionary];
-            @synchronized (self) {
-                [operationDictionary setObject:operation forKey:key];
-            }
-        }
-    }
-}
-
-- (void)sd_cancelImageLoadOperationWithKey:(nullable NSString *)key {
-    if (key) {
-        // Cancel in progress downloader from queue
-        SDOperationsDictionary *operationDictionary = [self sd_operationDictionary];
-        id<SDWebImageOperation> operation;
-        
-        @synchronized (self) {
-            operation = [operationDictionary objectForKey:key];
-        }
-        if (operation) {
-            if ([operation conformsToProtocol:@protocol(SDWebImageOperation)]) {
-                [operation cancel];
-            }
-            @synchronized (self) {
-                [operationDictionary removeObjectForKey:key];
-            }
-        }
-    }
-}
-
-- (void)sd_removeImageLoadOperationWithKey:(nullable NSString *)key {
-    if (key) {
-        SDOperationsDictionary *operationDictionary = [self sd_operationDictionary];
-        @synchronized (self) {
-            [operationDictionary removeObjectForKey:key];
-        }
-    }
-}
-
-@end
diff --git a/SDWebImage/include/SDWebImage/NSButton+WebCache.h b/SDWebImage/include/SDWebImage/NSButton+WebCache.h
new file mode 120000
index 000000000..c1f899242
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/NSButton+WebCache.h
@@ -0,0 +1 @@
+../../Core/NSButton+WebCache.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/NSData+ImageContentType.h b/SDWebImage/include/SDWebImage/NSData+ImageContentType.h
new file mode 120000
index 000000000..c0852b872
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/NSData+ImageContentType.h
@@ -0,0 +1 @@
+../../Core/NSData+ImageContentType.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/NSImage+Compatibility.h b/SDWebImage/include/SDWebImage/NSImage+Compatibility.h
new file mode 120000
index 000000000..cfad8619f
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/NSImage+Compatibility.h
@@ -0,0 +1 @@
+../../Core/NSImage+Compatibility.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDAnimatedImage.h b/SDWebImage/include/SDWebImage/SDAnimatedImage.h
new file mode 120000
index 000000000..f26f5de19
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDAnimatedImage.h
@@ -0,0 +1 @@
+../../Core/SDAnimatedImage.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDAnimatedImagePlayer.h b/SDWebImage/include/SDWebImage/SDAnimatedImagePlayer.h
new file mode 120000
index 000000000..6f7134856
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDAnimatedImagePlayer.h
@@ -0,0 +1 @@
+../../Core/SDAnimatedImagePlayer.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDAnimatedImageRep.h b/SDWebImage/include/SDWebImage/SDAnimatedImageRep.h
new file mode 120000
index 000000000..b19ae282a
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDAnimatedImageRep.h
@@ -0,0 +1 @@
+../../Core/SDAnimatedImageRep.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDAnimatedImageView+WebCache.h b/SDWebImage/include/SDWebImage/SDAnimatedImageView+WebCache.h
new file mode 120000
index 000000000..6dbc5fa96
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDAnimatedImageView+WebCache.h
@@ -0,0 +1 @@
+../../Core/SDAnimatedImageView+WebCache.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDAnimatedImageView.h b/SDWebImage/include/SDWebImage/SDAnimatedImageView.h
new file mode 120000
index 000000000..0a49071c8
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDAnimatedImageView.h
@@ -0,0 +1 @@
+../../Core/SDAnimatedImageView.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDCallbackQueue.h b/SDWebImage/include/SDWebImage/SDCallbackQueue.h
new file mode 120000
index 000000000..c9c9a33f5
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDCallbackQueue.h
@@ -0,0 +1 @@
+../../Core/SDCallbackQueue.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDDiskCache.h b/SDWebImage/include/SDWebImage/SDDiskCache.h
new file mode 120000
index 000000000..ba20df74a
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDDiskCache.h
@@ -0,0 +1 @@
+../../Core/SDDiskCache.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDGraphicsImageRenderer.h b/SDWebImage/include/SDWebImage/SDGraphicsImageRenderer.h
new file mode 120000
index 000000000..a9605ccdf
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDGraphicsImageRenderer.h
@@ -0,0 +1 @@
+../../Core/SDGraphicsImageRenderer.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDImageAPNGCoder.h b/SDWebImage/include/SDWebImage/SDImageAPNGCoder.h
new file mode 120000
index 000000000..20cba727e
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDImageAPNGCoder.h
@@ -0,0 +1 @@
+../../Core/SDImageAPNGCoder.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDImageAWebPCoder.h b/SDWebImage/include/SDWebImage/SDImageAWebPCoder.h
new file mode 120000
index 000000000..eba84c362
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDImageAWebPCoder.h
@@ -0,0 +1 @@
+../../Core/SDImageAWebPCoder.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDImageCache.h b/SDWebImage/include/SDWebImage/SDImageCache.h
new file mode 120000
index 000000000..0783c1ceb
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDImageCache.h
@@ -0,0 +1 @@
+../../Core/SDImageCache.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDImageCacheConfig.h b/SDWebImage/include/SDWebImage/SDImageCacheConfig.h
new file mode 120000
index 000000000..0a58b4f89
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDImageCacheConfig.h
@@ -0,0 +1 @@
+../../Core/SDImageCacheConfig.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDImageCacheDefine.h b/SDWebImage/include/SDWebImage/SDImageCacheDefine.h
new file mode 120000
index 000000000..0a4698806
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDImageCacheDefine.h
@@ -0,0 +1 @@
+../../Core/SDImageCacheDefine.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDImageCachesManager.h b/SDWebImage/include/SDWebImage/SDImageCachesManager.h
new file mode 120000
index 000000000..d01f76f47
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDImageCachesManager.h
@@ -0,0 +1 @@
+../../Core/SDImageCachesManager.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDImageCoder.h b/SDWebImage/include/SDWebImage/SDImageCoder.h
new file mode 120000
index 000000000..75472fb10
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDImageCoder.h
@@ -0,0 +1 @@
+../../Core/SDImageCoder.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDImageCoderHelper.h b/SDWebImage/include/SDWebImage/SDImageCoderHelper.h
new file mode 120000
index 000000000..3e68b9456
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDImageCoderHelper.h
@@ -0,0 +1 @@
+../../Core/SDImageCoderHelper.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDImageCodersManager.h b/SDWebImage/include/SDWebImage/SDImageCodersManager.h
new file mode 120000
index 000000000..48b8b531a
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDImageCodersManager.h
@@ -0,0 +1 @@
+../../Core/SDImageCodersManager.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDImageFrame.h b/SDWebImage/include/SDWebImage/SDImageFrame.h
new file mode 120000
index 000000000..ab05e26eb
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDImageFrame.h
@@ -0,0 +1 @@
+../../Core/SDImageFrame.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDImageGIFCoder.h b/SDWebImage/include/SDWebImage/SDImageGIFCoder.h
new file mode 120000
index 000000000..04191623e
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDImageGIFCoder.h
@@ -0,0 +1 @@
+../../Core/SDImageGIFCoder.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDImageGraphics.h b/SDWebImage/include/SDWebImage/SDImageGraphics.h
new file mode 120000
index 000000000..823dbd708
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDImageGraphics.h
@@ -0,0 +1 @@
+../../Core/SDImageGraphics.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDImageHEICCoder.h b/SDWebImage/include/SDWebImage/SDImageHEICCoder.h
new file mode 120000
index 000000000..9352871dc
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDImageHEICCoder.h
@@ -0,0 +1 @@
+../../Core/SDImageHEICCoder.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDImageIOAnimatedCoder.h b/SDWebImage/include/SDWebImage/SDImageIOAnimatedCoder.h
new file mode 120000
index 000000000..3053de3b1
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDImageIOAnimatedCoder.h
@@ -0,0 +1 @@
+../../Core/SDImageIOAnimatedCoder.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDImageIOCoder.h b/SDWebImage/include/SDWebImage/SDImageIOCoder.h
new file mode 120000
index 000000000..9cd1e482b
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDImageIOCoder.h
@@ -0,0 +1 @@
+../../Core/SDImageIOCoder.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDImageLoader.h b/SDWebImage/include/SDWebImage/SDImageLoader.h
new file mode 120000
index 000000000..ba476e52d
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDImageLoader.h
@@ -0,0 +1 @@
+../../Core/SDImageLoader.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDImageLoadersManager.h b/SDWebImage/include/SDWebImage/SDImageLoadersManager.h
new file mode 120000
index 000000000..442dd4c75
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDImageLoadersManager.h
@@ -0,0 +1 @@
+../../Core/SDImageLoadersManager.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDImageTransformer.h b/SDWebImage/include/SDWebImage/SDImageTransformer.h
new file mode 120000
index 000000000..184361bd9
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDImageTransformer.h
@@ -0,0 +1 @@
+../../Core/SDImageTransformer.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDMemoryCache.h b/SDWebImage/include/SDWebImage/SDMemoryCache.h
new file mode 120000
index 000000000..47abcc12f
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDMemoryCache.h
@@ -0,0 +1 @@
+../../Core/SDMemoryCache.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDWebImage.h b/SDWebImage/include/SDWebImage/SDWebImage.h
new file mode 120000
index 000000000..12cbb09a5
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDWebImage.h
@@ -0,0 +1 @@
+../../../WebImage/SDWebImage.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDWebImageCacheKeyFilter.h b/SDWebImage/include/SDWebImage/SDWebImageCacheKeyFilter.h
new file mode 120000
index 000000000..7481d7d3e
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDWebImageCacheKeyFilter.h
@@ -0,0 +1 @@
+../../Core/SDWebImageCacheKeyFilter.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDWebImageCacheSerializer.h b/SDWebImage/include/SDWebImage/SDWebImageCacheSerializer.h
new file mode 120000
index 000000000..b7d69b29c
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDWebImageCacheSerializer.h
@@ -0,0 +1 @@
+../../Core/SDWebImageCacheSerializer.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDWebImageCompat.h b/SDWebImage/include/SDWebImage/SDWebImageCompat.h
new file mode 120000
index 000000000..c3c301d0c
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDWebImageCompat.h
@@ -0,0 +1 @@
+../../Core/SDWebImageCompat.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDWebImageDefine.h b/SDWebImage/include/SDWebImage/SDWebImageDefine.h
new file mode 120000
index 000000000..6112007b3
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDWebImageDefine.h
@@ -0,0 +1 @@
+../../Core/SDWebImageDefine.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDWebImageDownloader.h b/SDWebImage/include/SDWebImage/SDWebImageDownloader.h
new file mode 120000
index 000000000..ffb6248e8
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDWebImageDownloader.h
@@ -0,0 +1 @@
+../../Core/SDWebImageDownloader.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDWebImageDownloaderConfig.h b/SDWebImage/include/SDWebImage/SDWebImageDownloaderConfig.h
new file mode 120000
index 000000000..8959bbbcd
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDWebImageDownloaderConfig.h
@@ -0,0 +1 @@
+../../Core/SDWebImageDownloaderConfig.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDWebImageDownloaderDecryptor.h b/SDWebImage/include/SDWebImage/SDWebImageDownloaderDecryptor.h
new file mode 120000
index 000000000..fd6de4d8c
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDWebImageDownloaderDecryptor.h
@@ -0,0 +1 @@
+../../Core/SDWebImageDownloaderDecryptor.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDWebImageDownloaderOperation.h b/SDWebImage/include/SDWebImage/SDWebImageDownloaderOperation.h
new file mode 120000
index 000000000..ef18b7c2a
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDWebImageDownloaderOperation.h
@@ -0,0 +1 @@
+../../Core/SDWebImageDownloaderOperation.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDWebImageDownloaderRequestModifier.h b/SDWebImage/include/SDWebImage/SDWebImageDownloaderRequestModifier.h
new file mode 120000
index 000000000..f7aa82b94
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDWebImageDownloaderRequestModifier.h
@@ -0,0 +1 @@
+../../Core/SDWebImageDownloaderRequestModifier.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDWebImageDownloaderResponseModifier.h b/SDWebImage/include/SDWebImage/SDWebImageDownloaderResponseModifier.h
new file mode 120000
index 000000000..be3911976
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDWebImageDownloaderResponseModifier.h
@@ -0,0 +1 @@
+../../Core/SDWebImageDownloaderResponseModifier.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDWebImageError.h b/SDWebImage/include/SDWebImage/SDWebImageError.h
new file mode 120000
index 000000000..b088fc039
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDWebImageError.h
@@ -0,0 +1 @@
+../../Core/SDWebImageError.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDWebImageIndicator.h b/SDWebImage/include/SDWebImage/SDWebImageIndicator.h
new file mode 120000
index 000000000..60f464f26
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDWebImageIndicator.h
@@ -0,0 +1 @@
+../../Core/SDWebImageIndicator.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDWebImageManager.h b/SDWebImage/include/SDWebImage/SDWebImageManager.h
new file mode 120000
index 000000000..20ddf7c75
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDWebImageManager.h
@@ -0,0 +1 @@
+../../Core/SDWebImageManager.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDWebImageOperation.h b/SDWebImage/include/SDWebImage/SDWebImageOperation.h
new file mode 120000
index 000000000..e7bf5badc
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDWebImageOperation.h
@@ -0,0 +1 @@
+../../Core/SDWebImageOperation.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDWebImageOptionsProcessor.h b/SDWebImage/include/SDWebImage/SDWebImageOptionsProcessor.h
new file mode 120000
index 000000000..b1e48c72e
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDWebImageOptionsProcessor.h
@@ -0,0 +1 @@
+../../Core/SDWebImageOptionsProcessor.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDWebImagePrefetcher.h b/SDWebImage/include/SDWebImage/SDWebImagePrefetcher.h
new file mode 120000
index 000000000..1346c8d29
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDWebImagePrefetcher.h
@@ -0,0 +1 @@
+../../Core/SDWebImagePrefetcher.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/SDWebImageTransition.h b/SDWebImage/include/SDWebImage/SDWebImageTransition.h
new file mode 120000
index 000000000..19b24b09f
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/SDWebImageTransition.h
@@ -0,0 +1 @@
+../../Core/SDWebImageTransition.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/UIButton+WebCache.h b/SDWebImage/include/SDWebImage/UIButton+WebCache.h
new file mode 120000
index 000000000..2a9820d8f
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/UIButton+WebCache.h
@@ -0,0 +1 @@
+../../Core/UIButton+WebCache.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/UIImage+ExtendedCacheData.h b/SDWebImage/include/SDWebImage/UIImage+ExtendedCacheData.h
new file mode 120000
index 000000000..fab25a7e2
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/UIImage+ExtendedCacheData.h
@@ -0,0 +1 @@
+../../Core/UIImage+ExtendedCacheData.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/UIImage+ForceDecode.h b/SDWebImage/include/SDWebImage/UIImage+ForceDecode.h
new file mode 120000
index 000000000..0ef287128
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/UIImage+ForceDecode.h
@@ -0,0 +1 @@
+../../Core/UIImage+ForceDecode.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/UIImage+GIF.h b/SDWebImage/include/SDWebImage/UIImage+GIF.h
new file mode 120000
index 000000000..30e9dd4a9
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/UIImage+GIF.h
@@ -0,0 +1 @@
+../../Core/UIImage+GIF.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/UIImage+MemoryCacheCost.h b/SDWebImage/include/SDWebImage/UIImage+MemoryCacheCost.h
new file mode 120000
index 000000000..81d6161d3
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/UIImage+MemoryCacheCost.h
@@ -0,0 +1 @@
+../../Core/UIImage+MemoryCacheCost.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/UIImage+Metadata.h b/SDWebImage/include/SDWebImage/UIImage+Metadata.h
new file mode 120000
index 000000000..65eb11f4a
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/UIImage+Metadata.h
@@ -0,0 +1 @@
+../../Core/UIImage+Metadata.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/UIImage+MultiFormat.h b/SDWebImage/include/SDWebImage/UIImage+MultiFormat.h
new file mode 120000
index 000000000..5366a33a1
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/UIImage+MultiFormat.h
@@ -0,0 +1 @@
+../../Core/UIImage+MultiFormat.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/UIImage+Transform.h b/SDWebImage/include/SDWebImage/UIImage+Transform.h
new file mode 120000
index 000000000..73bdf3fd8
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/UIImage+Transform.h
@@ -0,0 +1 @@
+../../Core/UIImage+Transform.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/UIImageView+HighlightedWebCache.h b/SDWebImage/include/SDWebImage/UIImageView+HighlightedWebCache.h
new file mode 120000
index 000000000..a9898113b
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/UIImageView+HighlightedWebCache.h
@@ -0,0 +1 @@
+../../Core/UIImageView+HighlightedWebCache.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/UIImageView+WebCache.h b/SDWebImage/include/SDWebImage/UIImageView+WebCache.h
new file mode 120000
index 000000000..8e732df7a
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/UIImageView+WebCache.h
@@ -0,0 +1 @@
+../../Core/UIImageView+WebCache.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/UIView+WebCache.h b/SDWebImage/include/SDWebImage/UIView+WebCache.h
new file mode 120000
index 000000000..6a1b138cd
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/UIView+WebCache.h
@@ -0,0 +1 @@
+../../Core/UIView+WebCache.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/UIView+WebCacheOperation.h b/SDWebImage/include/SDWebImage/UIView+WebCacheOperation.h
new file mode 120000
index 000000000..5631d02a6
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/UIView+WebCacheOperation.h
@@ -0,0 +1 @@
+../../Core/UIView+WebCacheOperation.h
\ No newline at end of file
diff --git a/SDWebImage/include/SDWebImage/UIView+WebCacheState.h b/SDWebImage/include/SDWebImage/UIView+WebCacheState.h
new file mode 120000
index 000000000..07799f85b
--- /dev/null
+++ b/SDWebImage/include/SDWebImage/UIView+WebCacheState.h
@@ -0,0 +1 @@
+../../Core/UIView+WebCacheState.h
\ No newline at end of file
diff --git a/SDWebImage/MKAnnotationView+WebCache.h b/SDWebImageMapKit/MapKit/MKAnnotationView+WebCache.h
similarity index 54%
rename from SDWebImage/MKAnnotationView+WebCache.h
rename to SDWebImageMapKit/MapKit/MKAnnotationView+WebCache.h
index 0f313af6a..30f5aed17 100644
--- a/SDWebImage/MKAnnotationView+WebCache.h
+++ b/SDWebImageMapKit/MapKit/MKAnnotationView+WebCache.h
@@ -6,12 +6,11 @@
  * file that was distributed with this source code.
  */
 
-#import "SDWebImageCompat.h"
+#import <SDWebImage/SDWebImage.h>
 
 #if SD_UIKIT || SD_MAC
 
 #import <MapKit/MapKit.h>
-#import "SDWebImageManager.h"
 
 /**
  * Integrates SDWebImage async downloading and caching of remote images with MKAnnotationView.
@@ -53,6 +52,22 @@
           placeholderImage:(nullable UIImage *)placeholder
                    options:(SDWebImageOptions)options NS_REFINED_FOR_SWIFT;
 
+/**
+ * Set the imageView `image` with an `url`, placeholder, custom options and context.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url         The url for the image.
+ * @param placeholder The image to be set initially, until the image request finishes.
+ * @param options     The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param context     A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
+ */
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+          placeholderImage:(nullable UIImage *)placeholder
+                   options:(SDWebImageOptions)options
+                   context:(nullable SDWebImageContext *)context;
+
 /**
  * Set the imageView `image` with an `url`.
  *
@@ -104,6 +119,52 @@
                    options:(SDWebImageOptions)options
                  completed:(nullable SDExternalCompletionBlock)completedBlock;
 
+/**
+ * Set the imageView `image` with an `url`, placeholder and custom options.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param placeholder    The image to be set initially, until the image request finishes.
+ * @param options        The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param progressBlock  A block called while image is downloading
+ *                       @note the progress block is executed on a background queue
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+          placeholderImage:(nullable UIImage *)placeholder
+                   options:(SDWebImageOptions)options
+                  progress:(nullable SDImageLoaderProgressBlock)progressBlock
+                 completed:(nullable SDExternalCompletionBlock)completedBlock;
+
+/**
+ * Set the imageView `image` with an `url`, placeholder, custom options and context.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param placeholder    The image to be set initially, until the image request finishes.
+ * @param options        The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param context        A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
+ * @param progressBlock  A block called while image is downloading
+ *                       @note the progress block is executed on a background queue
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+          placeholderImage:(nullable UIImage *)placeholder
+                   options:(SDWebImageOptions)options
+                   context:(nullable SDWebImageContext *)context
+                  progress:(nullable SDImageLoaderProgressBlock)progressBlock
+                 completed:(nullable SDExternalCompletionBlock)completedBlock;
+
 @end
 
 #endif
diff --git a/SDWebImageMapKit/MapKit/MKAnnotationView+WebCache.m b/SDWebImageMapKit/MapKit/MKAnnotationView+WebCache.m
new file mode 100644
index 000000000..4969c0ba0
--- /dev/null
+++ b/SDWebImageMapKit/MapKit/MKAnnotationView+WebCache.m
@@ -0,0 +1,71 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "MKAnnotationView+WebCache.h"
+
+#if SD_UIKIT || SD_MAC
+
+@implementation MKAnnotationView (WebCache)
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url {
+    [self sd_setImageWithURL:url placeholderImage:nil options:0 completed:nil];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder {
+    [self sd_setImageWithURL:url placeholderImage:placeholder options:0 completed:nil];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options {
+    [self sd_setImageWithURL:url placeholderImage:placeholder options:options progress:nil completed:nil];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options context:(nullable SDWebImageContext *)context {
+    [self sd_setImageWithURL:url placeholderImage:placeholder options:options context:context progress:nil completed:nil];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setImageWithURL:url placeholderImage:nil options:0 completed:completedBlock];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setImageWithURL:url placeholderImage:placeholder options:0 completed:completedBlock];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setImageWithURL:url placeholderImage:placeholder options:options progress:nil completed:completedBlock];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options progress:(nullable SDImageLoaderProgressBlock)progressBlock completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setImageWithURL:url placeholderImage:placeholder options:options context:nil progress:progressBlock completed:completedBlock];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+          placeholderImage:(nullable UIImage *)placeholder
+                   options:(SDWebImageOptions)options
+                   context:(nullable SDWebImageContext *)context
+                  progress:(nullable SDImageLoaderProgressBlock)progressBlock
+                 completed:(nullable SDExternalCompletionBlock)completedBlock {
+    __weak typeof(self) wself = self;
+    [self sd_internalSetImageWithURL:url
+                    placeholderImage:placeholder
+                             options:options
+                             context:context
+                       setImageBlock:^(UIImage * _Nullable image, NSData * _Nullable imageData, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+                           wself.image = image;
+                       }
+                            progress:progressBlock
+                           completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+                               if (completedBlock) {
+                                   completedBlock(image, error, cacheType, imageURL);
+                               }
+                           }];
+}
+
+@end
+
+#endif
diff --git a/SDWebImageMapKit/Resources/PrivacyInfo.xcprivacy b/SDWebImageMapKit/Resources/PrivacyInfo.xcprivacy
new file mode 120000
index 000000000..44bc9be3b
--- /dev/null
+++ b/SDWebImageMapKit/Resources/PrivacyInfo.xcprivacy
@@ -0,0 +1 @@
+../../WebImage/PrivacyInfo.xcprivacy
\ No newline at end of file
diff --git a/SDWebImageMapKit/include/SDWebImageMapKit/MKAnnotationView+WebCache.h b/SDWebImageMapKit/include/SDWebImageMapKit/MKAnnotationView+WebCache.h
new file mode 120000
index 000000000..28a11933b
--- /dev/null
+++ b/SDWebImageMapKit/include/SDWebImageMapKit/MKAnnotationView+WebCache.h
@@ -0,0 +1 @@
+../../MapKit/MKAnnotationView+WebCache.h
\ No newline at end of file
diff --git a/SDWebImageMapKit/include/SDWebImageMapKit/SDWebImageMapKit.h b/SDWebImageMapKit/include/SDWebImageMapKit/SDWebImageMapKit.h
new file mode 120000
index 000000000..8d1924410
--- /dev/null
+++ b/SDWebImageMapKit/include/SDWebImageMapKit/SDWebImageMapKit.h
@@ -0,0 +1 @@
+../../../WebImage/SDWebImageMapKit.h
\ No newline at end of file
diff --git a/SDWebImage_logo.png b/SDWebImage_logo.png
old mode 100644
new mode 100755
index bd2ec3a5f..ee2d81f34
Binary files a/SDWebImage_logo.png and b/SDWebImage_logo.png differ
diff --git a/SDWebImage_logo_small.png b/SDWebImage_logo_small.png
index e99d4c864..b10d6b31e 100644
Binary files a/SDWebImage_logo_small.png and b/SDWebImage_logo_small.png differ
diff --git a/Scripts/build-frameworks.sh b/Scripts/build-frameworks.sh
new file mode 100755
index 000000000..79a8bbd9f
--- /dev/null
+++ b/Scripts/build-frameworks.sh
@@ -0,0 +1,60 @@
+#!/bin/bash
+
+set -e
+set -o pipefail
+
+if [[ -z "$XCODE_VERSION_MAJOR" ]]
+then
+    XCODE_VERSION_MAJOR=$(xcodebuild -showBuildSettings | awk -F= '/XCODE_VERSION_MAJOR/{x=$NF; gsub(/[^0-9]/,"",x); print int(x)}')
+fi
+if [[ -z "$XCODE_VERSION_MINOR" ]]  
+then
+    XCODE_VERSION_MINOR=$(xcodebuild -showBuildSettings | awk -F= '/XCODE_VERSION_MINOR/{x=$NF; gsub(/[^0-9]/,"",x); print int(x)}')
+fi
+XCODE_MAJOR=$(($XCODE_VERSION_MAJOR / 100))
+XCODE_MINOR=$(($XCODE_VERSION_MINOR / 10))
+XCODE_MINOR=$(($XCODE_MINOR % 10))
+echo "XCODE_MAJOR=$XCODE_MAJOR"
+echo "XCODE_MINOR=$XCODE_MINOR"
+if [[ -z "$SRCROOT" ]]
+then
+    SRCROOT=$(pwd)
+fi
+
+mkdir -p "${SRCROOT}/build"
+PLATFORMS=("iOS" "iOSSimulator" "macOS" "tvOS" "tvOSSimulator" "watchOS" "watchOSSimulator")
+
+if [ $XCODE_MAJOR -ge 11 ]
+then
+    PLATFORMS+=("macCatalyst")
+fi
+
+if [[ ($XCODE_MAJOR -gt 15) || ($XCODE_MAJOR -eq 15 && $XCODE_MINOR -ge 2) ]]
+then
+    PLATFORMS+=("visionOS")
+    PLATFORMS+=("visionOSSimulator")
+fi
+
+for CURRENT_PLATFORM in "${PLATFORMS[@]}"
+do
+    DESTINATION="generic/platform=${CURRENT_PLATFORM}"
+
+    # macOS Catalyst
+    if [[ $CURRENT_PLATFORM == "macCatalyst" ]]; then
+        DESTINATION="generic/platform=macOS,variant=Mac Catalyst"
+    fi
+
+    # Simulator
+    if [[ $CURRENT_PLATFORM == *Simulator ]]; then
+        CURRENT_PLATFORM_OS=${CURRENT_PLATFORM%Simulator}
+        DESTINATION="generic/platform=${CURRENT_PLATFORM_OS} Simulator"
+    fi
+
+    if [[ $MACH_O_TYPE == "staticlib" ]]; then
+        XCCCONFIG_PATH="${SRCROOT}/Configs/Static.xcconfig"
+    else
+        XCCCONFIG_PATH="${SRCROOT}/Configs/Dynamic.xcconfig"
+    fi
+
+    xcodebuild build -project "SDWebImage.xcodeproj" -destination "${DESTINATION}" -scheme "SDWebImage" -configuration "Release" -xcconfig "${XCCCONFIG_PATH}" -derivedDataPath "${SRCROOT}/build/DerivedData" CONFIGURATION_BUILD_DIR="${SRCROOT}/build/${CURRENT_PLATFORM}/"
+done
diff --git a/Scripts/create-xcframework.sh b/Scripts/create-xcframework.sh
new file mode 100755
index 000000000..ab0ee7912
--- /dev/null
+++ b/Scripts/create-xcframework.sh
@@ -0,0 +1,56 @@
+#!/bin/bash
+
+set -e
+set -o pipefail
+
+if [[ -z "$XCODE_VERSION_MAJOR" ]]
+then
+    XCODE_VERSION_MAJOR=$(xcodebuild -showBuildSettings | awk -F= '/XCODE_VERSION_MAJOR/{x=$NF; gsub(/[^0-9]/,"",x); print int(x)}')
+fi
+if [[ -z "$XCODE_VERSION_MINOR" ]]  
+then
+    XCODE_VERSION_MINOR=$(xcodebuild -showBuildSettings | awk -F= '/XCODE_VERSION_MINOR/{x=$NF; gsub(/[^0-9]/,"",x); print int(x)}')
+fi
+XCODE_MAJOR=$(($XCODE_VERSION_MAJOR / 100))
+XCODE_MINOR=$(($XCODE_VERSION_MINOR / 10))
+XCODE_MINOR=$(($XCODE_MINOR % 10))
+echo "XCODE_MAJOR=$XCODE_MAJOR"
+echo "XCODE_MINOR=$XCODE_MINOR"
+if [ -z "$SRCROOT" ]
+then
+    SRCROOT=$(pwd)
+fi
+
+if [ $XCODE_MAJOR -lt 11 ]
+then
+    echo "Xcode 10 does not support xcframework. You can still use the individual framework for each platform."
+    open -a Finder "${SRCROOT}/build/"
+    exit 0
+fi
+
+mkdir -p "${SRCROOT}/build"
+PLATFORMS=("iOS" "iOSSimulator" "macOS" "tvOS" "tvOSSimulator" "watchOS" "watchOSSimulator")
+
+if [ $XCODE_MAJOR -ge 11 ]
+then
+    PLATFORMS+=("macCatalyst")
+fi
+
+if [[ ($XCODE_MAJOR -gt 15) || ($XCODE_MAJOR -eq 15 && $XCODE_MINOR -ge 2) ]]
+then
+    PLATFORMS+=("visionOS")
+    PLATFORMS+=("visionOSSimulator")
+fi
+
+COMMAND_ARGS=""
+for CURRENT_PLATFORM in "${PLATFORMS[@]}"
+do
+    COMMAND_ARGS="${COMMAND_ARGS} -framework ${SRCROOT}/build/${CURRENT_PLATFORM}/SDWebImage.framework"
+    if [[ $MACH_O_TYPE != "staticlib" ]]; then
+        COMMAND_ARGS="${COMMAND_ARGS} -debug-symbols ${SRCROOT}/build/${CURRENT_PLATFORM}/SDWebImage.framework.dSYM"
+    fi
+done
+
+# Combine XCFramework
+echo "Create XCFramework"
+xcodebuild -create-xcframework $COMMAND_ARGS -output "${SRCROOT}/build/SDWebImage.xcframework"
diff --git a/Scripts/sign-xcframework.sh b/Scripts/sign-xcframework.sh
new file mode 100755
index 000000000..c44845454
--- /dev/null
+++ b/Scripts/sign-xcframework.sh
@@ -0,0 +1,37 @@
+#!/bin/bash
+
+set -e
+set -x
+set -o pipefail
+
+if [ -z "$SRCROOT" ]
+then
+    SRCROOT=$(pwd)
+fi
+
+# Self-sign XCFramework
+if [ -z $CODESIGN_KEY_BASE64 ]; then
+    echo "Ignore Codesign XCFramework! You must sign SDWebImage before shipping to App Store. See: https://developer.apple.com/support/third-party-SDK-requirements"
+    exit 0
+fi
+
+KEYCHAIN=~/Library/Keychains/ios.keychain
+KEYCHAIN_PASSWORD=SDWebImage
+CODESIGN_IDENTIFY_NAME=SDWebImage\ Signing\ Certificate
+KEY_PASSWORD=""
+
+echo $CODESIGN_KEY_BASE64 | base64 -D > "$(PWD)/Certificate/${CODESIGN_IDENTIFY_NAME}.p12"
+
+security create-keychain -p "$KEYCHAIN_PASSWORD" ios.keychain
+security unlock-keychain -p "$KEYCHAIN_PASSWORD" $KEYCHAIN
+
+security import "$(PWD)/Certificate/${CODESIGN_IDENTIFY_NAME}.cer" -k $KEYCHAIN -T /usr/bin/codesign
+security import "$(PWD)/Certificate/${CODESIGN_IDENTIFY_NAME}.p12" -k $KEYCHAIN -P "$KEY_PASSWORD" -T /usr/bin/codesign
+security list-keychains -s ios.keychain
+security set-key-partition-list -S apple-tool:,apple: -s -k "$KEYCHAIN_PASSWORD" $KEYCHAIN
+
+echo "Codesign XCFramework"
+/usr/bin/codesign --force --timestamp -v --sign "SDWebImage Signing Certificate" "${SRCROOT}/build/SDWebImage.xcframework"
+
+rm -rf "$(PWD)/Certificate/${CODESIGN_IDENTIFY_NAME}.p12"
+security delete-keychain ios.keychain
\ No newline at end of file
diff --git a/Tests/Expecta.podspec b/Tests/Expecta.podspec
new file mode 100644
index 000000000..2c848a40d
--- /dev/null
+++ b/Tests/Expecta.podspec
@@ -0,0 +1,31 @@
+Pod::Spec.new do |s|
+  s.name     = 'Expecta'
+  s.version  = '1.0.6'
+  s.license  = { :type => 'MIT', :file => 'LICENSE' }
+  s.summary  = 'A matcher framework for Objective-C & Cocoa.'
+  s.homepage = 'http://github.com/petejkim/expecta'
+  s.author   = { 'Peter Jihoon Kim' => 'raingrove@gmail.com' }
+
+  s.source   = { :git => 'https://github.com/specta/expecta.git', :tag => "v#{s.version}" }
+
+  s.description = %{
+    Expecta is a matcher framework for Objective-C and Cocoa. The main
+    advantage of using Expecta over other matcher frameworks is that you do not
+    have to specify the data types. Also, the syntax of Expecta matchers is
+    much more readable and does not suffer from parenthesitis. If you have used
+    Jasmine before, you will feel right at home!
+  }
+
+  s.source_files = 'Expecta/**/*.{h,m}'
+
+  s.requires_arc = false
+  s.ios.deployment_target = '9.0'
+  s.osx.deployment_target = '10.11'
+  s.tvos.deployment_target = '9.0'
+  s.watchos.deployment_target = '2.0'
+  s.visionos.deployment_target = '1.0'
+
+  s.frameworks = 'Foundation', 'XCTest'
+  s.pod_target_xcconfig = { 'ENABLE_BITCODE' => 'NO' }
+  s.user_target_xcconfig = { 'FRAMEWORK_SEARCH_PATHS' => '$(PLATFORM_DIR)/Developer/Library/Frameworks' }
+end
diff --git a/Tests/KVOController.podspec b/Tests/KVOController.podspec
new file mode 100644
index 000000000..b9ef20479
--- /dev/null
+++ b/Tests/KVOController.podspec
@@ -0,0 +1,25 @@
+Pod::Spec.new do |spec|
+  spec.name         = 'KVOController'
+  spec.version      = '1.2.0'
+  spec.license      =  { :type => 'BSD' }
+  spec.homepage     = 'https://github.com/facebook/KVOController'
+  spec.authors      = { 'Kimon Tsinteris' => 'kimon@mac.com', 'Nikita Lutsenko' => 'nlutsenko@me.com' }
+  spec.summary      = 'Simple, modern, thread-safe key-value observing.'
+  spec.description  = <<-DESC
+                      KVOController builds on Cocoa's time-tested key-value observing implementation. It offers a simple, modern API, that is also thread safe.
+                      Benefits include:
+                      Notification using blocks, custom actions, or NSKeyValueObserving callback.
+                      No exceptions on observer removal.
+                      Implicit observer removal on controller dealloc.
+                      Thread-safety with special guards against observer resurrection.
+                      DESC
+  spec.source       = { :git => 'https://github.com/facebook/KVOController.git', :tag => "v#{spec.version.to_s}" }
+  spec.source_files = 'FBKVOController/*.{h,m}'
+  spec.requires_arc = true
+
+  spec.ios.deployment_target = '9.0'
+  spec.osx.deployment_target = '10.11'
+  spec.tvos.deployment_target = '9.0'
+  spec.watchos.deployment_target = '2.0'
+  spec.visionos.deployment_target = '1.0'
+end
diff --git a/Tests/Podfile b/Tests/Podfile
deleted file mode 100644
index 6610b613f..000000000
--- a/Tests/Podfile
+++ /dev/null
@@ -1,15 +0,0 @@
-source 'https://github.com/CocoaPods/Specs.git'
-
-use_frameworks!
-
-project 'SDWebImage Tests'
-workspace '../SDWebImage'
-
-target 'Tests' do
-  platform :ios, '8.0'
-  pod 'Expecta'
-  pod 'SDWebImage/WebP', :path => '../'
-  pod 'SDWebImage/MapKit', :path => '../'
-  pod 'SDWebImage/GIF', :path => '../'
-
-end
diff --git a/Tests/SDWebImage Tests.xcodeproj/project.pbxproj b/Tests/SDWebImage Tests.xcodeproj/project.pbxproj
index 8013ef4d4..7ab2bf4a0 100644
--- a/Tests/SDWebImage Tests.xcodeproj/project.pbxproj	
+++ b/Tests/SDWebImage Tests.xcodeproj/project.pbxproj	
@@ -9,57 +9,304 @@
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-		321259EC1F39E3240096FE0E /* TestImageStatic.webp in Resources */ = {isa = PBXBuildFile; fileRef = 321259EB1F39E3240096FE0E /* TestImageStatic.webp */; };
-		321259EE1F39E4110096FE0E /* TestImageAnimated.webp in Resources */ = {isa = PBXBuildFile; fileRef = 321259ED1F39E4110096FE0E /* TestImageAnimated.webp */; };
-		32E6F0321F3A1B4700A945E6 /* SDWebImageTestDecoder.m in Sources */ = {isa = PBXBuildFile; fileRef = 32E6F0311F3A1B4700A945E6 /* SDWebImageTestDecoder.m */; };
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+		320224F72440C39B00E5B29D /* TestImageLarge.png in Resources */ = {isa = PBXBuildFile; fileRef = 320224F62440C39B00E5B29D /* TestImageLarge.png */; };
+		320224F82440C39B00E5B29D /* TestImageLarge.png in Resources */ = {isa = PBXBuildFile; fileRef = 320224F62440C39B00E5B29D /* TestImageLarge.png */; };
+		320224F92440C39B00E5B29D /* TestImageLarge.png in Resources */ = {isa = PBXBuildFile; fileRef = 320224F62440C39B00E5B29D /* TestImageLarge.png */; };
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+			outputFileListPaths = (
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-				"${BUILT_PRODUCTS_DIR}/SDWebImage/SDWebImage.framework",
-				"${BUILT_PRODUCTS_DIR}/libwebp/libwebp.framework",
+				"${PODS_ROOT}/Target Support Files/Pods-Tests Mac/Pods-Tests Mac-frameworks.sh",
+				"${BUILT_PRODUCTS_DIR}/SDWebImage-Core-MapKit-macOS/SDWebImage.framework",
+				"${BUILT_PRODUCTS_DIR}/Expecta-macOS/Expecta.framework",
+				"${BUILT_PRODUCTS_DIR}/KVOController-macOS/KVOController.framework",
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-				CLANG_ENABLE_MODULES = YES;
-				CLANG_ENABLE_OBJC_ARC = YES;
-				CLANG_WARN_BOOL_CONVERSION = YES;
-				CLANG_WARN_CONSTANT_CONVERSION = YES;
-				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
-				CLANG_WARN_EMPTY_BODY = YES;
-				CLANG_WARN_ENUM_CONVERSION = YES;
-				CLANG_WARN_INT_CONVERSION = YES;
-				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
-				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
-				COPY_PHASE_STRIP = NO;
-				GCC_C_LANGUAGE_STANDARD = gnu99;
-				GCC_DYNAMIC_NO_PIC = NO;
-				GCC_OPTIMIZATION_LEVEL = 0;
 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
 				GCC_PREFIX_HEADER = "Tests/Tests-Prefix.pch";
-				GCC_PREPROCESSOR_DEFINITIONS = (
-					"DEBUG=1",
-					"$(inherited)",
-				);
-				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
-				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
-				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
-				GCC_WARN_UNDECLARED_SELECTOR = YES;
-				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
-				GCC_WARN_UNUSED_FUNCTION = YES;
-				GCC_WARN_UNUSED_VARIABLE = YES;
 				INFOPLIST_FILE = "Tests/Tests-Info.plist";
-				ONLY_ACTIVE_ARCH = YES;
-				PRODUCT_BUNDLE_IDENTIFIER = "com.SDWebImage.${PRODUCT_NAME:rfc1034identifier}";
-				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = iphoneos;
-				WRAPPER_EXTENSION = xctest;
+				SUPPORTED_PLATFORMS = "iphonesimulator iphoneos";
+				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
 		};
 		DA248D66195472AA00390AB0 /* Release */ = {
 			isa = XCBuildConfiguration;
-			baseConfigurationReference = A0085854E7D88C98F2F6C9FC /* Pods-Tests.release.xcconfig */;
+			baseConfigurationReference = 4DCBA1DEFE6C68C4A83C9B9E /* Pods-Tests iOS.release.xcconfig */;
 			buildSettings = {
-				ALWAYS_SEARCH_USER_PATHS = NO;
-				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
-				CLANG_CXX_LIBRARY = "libc++";
-				CLANG_ENABLE_MODULES = YES;
-				CLANG_ENABLE_OBJC_ARC = YES;
-				CLANG_WARN_BOOL_CONVERSION = YES;
-				CLANG_WARN_CONSTANT_CONVERSION = YES;
-				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
-				CLANG_WARN_EMPTY_BODY = YES;
-				CLANG_WARN_ENUM_CONVERSION = YES;
-				CLANG_WARN_INT_CONVERSION = YES;
-				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
-				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
-				COPY_PHASE_STRIP = YES;
-				ENABLE_NS_ASSERTIONS = NO;
-				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
 				GCC_PREFIX_HEADER = "Tests/Tests-Prefix.pch";
-				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
-				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
-				GCC_WARN_UNDECLARED_SELECTOR = YES;
-				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
-				GCC_WARN_UNUSED_FUNCTION = YES;
-				GCC_WARN_UNUSED_VARIABLE = YES;
 				INFOPLIST_FILE = "Tests/Tests-Info.plist";
-				PRODUCT_BUNDLE_IDENTIFIER = "com.SDWebImage.${PRODUCT_NAME:rfc1034identifier}";
-				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = iphoneos;
-				VALIDATE_PRODUCT = YES;
-				WRAPPER_EXTENSION = xctest;
+				SUPPORTED_PLATFORMS = "iphonesimulator iphoneos";
+				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;
 		};
 /* End XCBuildConfiguration section */
 
 /* Begin XCConfigurationList section */
+		32464A8F2B7B0FF2006BE70E /* Build configuration list for PBXNativeTarget "Tests Vision" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				32464A8D2B7B0FF2006BE70E /* Debug */,
+				32464A8E2B7B0FF2006BE70E /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		329922312365D9A100EAFD97 /* Build configuration list for PBXNativeTarget "Tests TV" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				3299222F2365D9A100EAFD97 /* Debug */,
+				329922302365D9A100EAFD97 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		32B99E99203B2DF90017FD66 /* Build configuration list for PBXNativeTarget "Tests Mac" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				32B99E97203B2DF90017FD66 /* Debug */,
+				32B99E98203B2DF90017FD66 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
 		DA248D491954721A00390AB0 /* Build configuration list for PBXProject "SDWebImage Tests" */ = {
 			isa = XCConfigurationList;
 			buildConfigurations = (
@@ -457,7 +1296,7 @@
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Release;
 		};
-		DA248D67195472AA00390AB0 /* Build configuration list for PBXNativeTarget "Tests" */ = {
+		DA248D67195472AA00390AB0 /* Build configuration list for PBXNativeTarget "Tests iOS" */ = {
 			isa = XCConfigurationList;
 			buildConfigurations = (
 				DA248D65195472AA00390AB0 /* Debug */,
diff --git a/Tests/SDWebImage Tests.xcodeproj/xcshareddata/xcschemes/Tests Mac.xcscheme b/Tests/SDWebImage Tests.xcodeproj/xcshareddata/xcschemes/Tests Mac.xcscheme
new file mode 100644
index 000000000..292be3d4b
--- /dev/null
+++ b/Tests/SDWebImage Tests.xcodeproj/xcshareddata/xcschemes/Tests Mac.xcscheme	
@@ -0,0 +1,103 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1020"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "32B99E91203B2DF90017FD66"
+               BuildableName = "Tests Mac.xctest"
+               BlueprintName = "Tests Mac"
+               ReferencedContainer = "container:SDWebImage Tests.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      codeCoverageEnabled = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "32B99E91203B2DF90017FD66"
+            BuildableName = "Tests Mac.xctest"
+            BlueprintName = "Tests Mac"
+            ReferencedContainer = "container:SDWebImage Tests.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "32B99E91203B2DF90017FD66"
+               BuildableName = "Tests Mac.xctest"
+               BlueprintName = "Tests Mac"
+               ReferencedContainer = "container:SDWebImage Tests.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "32B99E91203B2DF90017FD66"
+            BuildableName = "Tests Mac.xctest"
+            BlueprintName = "Tests Mac"
+            ReferencedContainer = "container:SDWebImage Tests.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <EnvironmentVariables>
+         <EnvironmentVariable
+            key = "CI"
+            value = "${CI}"
+            isEnabled = "YES">
+         </EnvironmentVariable>
+      </EnvironmentVariables>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "32B99E91203B2DF90017FD66"
+            BuildableName = "Tests Mac.xctest"
+            BlueprintName = "Tests Mac"
+            ReferencedContainer = "container:SDWebImage Tests.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>
diff --git a/Tests/SDWebImage Tests.xcodeproj/xcshareddata/xcschemes/Tests TV.xcscheme b/Tests/SDWebImage Tests.xcodeproj/xcshareddata/xcschemes/Tests TV.xcscheme
new file mode 100644
index 000000000..dfba90186
--- /dev/null
+++ b/Tests/SDWebImage Tests.xcodeproj/xcshareddata/xcschemes/Tests TV.xcscheme	
@@ -0,0 +1,103 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1110"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "329922292365D9A100EAFD97"
+               BuildableName = "Tests TV.xctest"
+               BlueprintName = "Tests TV"
+               ReferencedContainer = "container:SDWebImage Tests.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      codeCoverageEnabled = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "329922292365D9A100EAFD97"
+            BuildableName = "Tests TV.xctest"
+            BlueprintName = "Tests TV"
+            ReferencedContainer = "container:SDWebImage Tests.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "329922292365D9A100EAFD97"
+               BuildableName = "Tests TV.xctest"
+               BlueprintName = "Tests TV"
+               ReferencedContainer = "container:SDWebImage Tests.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "329922292365D9A100EAFD97"
+            BuildableName = "Tests TV.xctest"
+            BlueprintName = "Tests TV"
+            ReferencedContainer = "container:SDWebImage Tests.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <EnvironmentVariables>
+         <EnvironmentVariable
+            key = "CI"
+            value = "${CI}"
+            isEnabled = "YES">
+         </EnvironmentVariable>
+      </EnvironmentVariables>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "329922292365D9A100EAFD97"
+            BuildableName = "Tests TV.xctest"
+            BlueprintName = "Tests TV"
+            ReferencedContainer = "container:SDWebImage Tests.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>
diff --git a/SDWebImage.xcodeproj/xcshareddata/xcschemes/SDWebImage watchOS static.xcscheme b/Tests/SDWebImage Tests.xcodeproj/xcshareddata/xcschemes/Tests Vision.xcscheme
similarity index 61%
rename from SDWebImage.xcodeproj/xcshareddata/xcschemes/SDWebImage watchOS static.xcscheme
rename to Tests/SDWebImage Tests.xcodeproj/xcshareddata/xcschemes/Tests Vision.xcscheme
index 3b5a1a6d8..d66c4eb12 100644
--- a/SDWebImage.xcodeproj/xcshareddata/xcschemes/SDWebImage watchOS static.xcscheme	
+++ b/Tests/SDWebImage Tests.xcodeproj/xcshareddata/xcschemes/Tests Vision.xcscheme	
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0920"
-   version = "1.3">
+   LastUpgradeVersion = "1520"
+   version = "2.2">
    <BuildAction
       parallelizeBuildables = "YES"
       buildImplicitDependencies = "YES">
@@ -12,13 +12,8 @@
             buildForProfiling = "YES"
             buildForArchiving = "YES"
             buildForAnalyzing = "YES">
-            <BuildableReference
-               BuildableIdentifier = "primary"
-               BlueprintIdentifier = "4314D11B1D0E0E3B004B36C9"
-               BuildableName = "libSDWebImage watchOS static.a"
-               BlueprintName = "SDWebImage watchOS static"
-               ReferencedContainer = "container:SDWebImage.xcodeproj">
-            </BuildableReference>
+            <AutocreatedTestPlanReference>
+            </AutocreatedTestPlanReference>
          </BuildActionEntry>
       </BuildActionEntries>
    </BuildAction>
@@ -26,18 +21,26 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
-      shouldUseLaunchSchemeArgsEnv = "YES">
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      shouldAutocreateTestPlan = "YES">
       <Testables>
+         <TestableReference
+            skipped = "NO"
+            parallelizable = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "32464A882B7B0FF2006BE70E"
+               BuildableName = "Tests Vision.xctest"
+               BlueprintName = "Tests Vision"
+               ReferencedContainer = "container:SDWebImage Tests.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
       </Testables>
-      <AdditionalOptions>
-      </AdditionalOptions>
    </TestAction>
    <LaunchAction
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
       launchStyle = "0"
       useCustomWorkingDirectory = "NO"
       ignoresPersistentStateOnLaunch = "NO"
@@ -47,14 +50,19 @@
       <MacroExpansion>
          <BuildableReference
             BuildableIdentifier = "primary"
-            BlueprintIdentifier = "4314D11B1D0E0E3B004B36C9"
-            BuildableName = "libSDWebImage watchOS static.a"
-            BlueprintName = "SDWebImage watchOS static"
-            ReferencedContainer = "container:SDWebImage.xcodeproj">
+            BlueprintIdentifier = "32464A882B7B0FF2006BE70E"
+            BuildableName = "Tests Vision.xctest"
+            BlueprintName = "Tests Vision"
+            ReferencedContainer = "container:SDWebImage Tests.xcodeproj">
          </BuildableReference>
       </MacroExpansion>
-      <AdditionalOptions>
-      </AdditionalOptions>
+      <EnvironmentVariables>
+         <EnvironmentVariable
+            key = "CI"
+            value = "${CI}"
+            isEnabled = "YES">
+         </EnvironmentVariable>
+      </EnvironmentVariables>
    </LaunchAction>
    <ProfileAction
       buildConfiguration = "Release"
@@ -65,10 +73,10 @@
       <MacroExpansion>
          <BuildableReference
             BuildableIdentifier = "primary"
-            BlueprintIdentifier = "4314D11B1D0E0E3B004B36C9"
-            BuildableName = "libSDWebImage watchOS static.a"
-            BlueprintName = "SDWebImage watchOS static"
-            ReferencedContainer = "container:SDWebImage.xcodeproj">
+            BlueprintIdentifier = "32464A882B7B0FF2006BE70E"
+            BuildableName = "Tests Vision.xctest"
+            BlueprintName = "Tests Vision"
+            ReferencedContainer = "container:SDWebImage Tests.xcodeproj">
          </BuildableReference>
       </MacroExpansion>
    </ProfileAction>
diff --git a/Tests/SDWebImage Tests.xcodeproj/xcshareddata/xcschemes/Tests.xcscheme b/Tests/SDWebImage Tests.xcodeproj/xcshareddata/xcschemes/Tests iOS.xcscheme
similarity index 78%
rename from Tests/SDWebImage Tests.xcodeproj/xcshareddata/xcschemes/Tests.xcscheme
rename to Tests/SDWebImage Tests.xcodeproj/xcshareddata/xcschemes/Tests iOS.xcscheme
index ea46472f3..755694469 100644
--- a/Tests/SDWebImage Tests.xcodeproj/xcshareddata/xcschemes/Tests.xcscheme	
+++ b/Tests/SDWebImage Tests.xcodeproj/xcshareddata/xcschemes/Tests iOS.xcscheme	
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0920"
+   LastUpgradeVersion = "1020"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -15,8 +15,8 @@
             <BuildableReference
                BuildableIdentifier = "primary"
                BlueprintIdentifier = "DA248D52195472AA00390AB0"
-               BuildableName = "Tests.xctest"
-               BlueprintName = "Tests"
+               BuildableName = "Tests iOS.xctest"
+               BlueprintName = "Tests iOS"
                ReferencedContainer = "container:SDWebImage Tests.xcodeproj">
             </BuildableReference>
          </BuildActionEntry>
@@ -26,29 +26,34 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
       shouldUseLaunchSchemeArgsEnv = "YES"
       codeCoverageEnabled = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "DA248D52195472AA00390AB0"
+            BuildableName = "Tests iOS.xctest"
+            BlueprintName = "Tests iOS"
+            ReferencedContainer = "container:SDWebImage Tests.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
       <Testables>
          <TestableReference
             skipped = "NO">
             <BuildableReference
                BuildableIdentifier = "primary"
                BlueprintIdentifier = "DA248D52195472AA00390AB0"
-               BuildableName = "Tests.xctest"
-               BlueprintName = "Tests"
+               BuildableName = "Tests iOS.xctest"
+               BlueprintName = "Tests iOS"
                ReferencedContainer = "container:SDWebImage Tests.xcodeproj">
             </BuildableReference>
          </TestableReference>
       </Testables>
-      <AdditionalOptions>
-      </AdditionalOptions>
    </TestAction>
    <LaunchAction
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
       launchStyle = "0"
       useCustomWorkingDirectory = "NO"
       ignoresPersistentStateOnLaunch = "NO"
@@ -59,20 +64,18 @@
          <BuildableReference
             BuildableIdentifier = "primary"
             BlueprintIdentifier = "DA248D52195472AA00390AB0"
-            BuildableName = "Tests.xctest"
-            BlueprintName = "Tests"
+            BuildableName = "Tests iOS.xctest"
+            BlueprintName = "Tests iOS"
             ReferencedContainer = "container:SDWebImage Tests.xcodeproj">
          </BuildableReference>
       </MacroExpansion>
       <EnvironmentVariables>
          <EnvironmentVariable
-            key = "OS_ACTIVITY_MODE"
-            value = "disable"
+            key = "CI"
+            value = "${CI}"
             isEnabled = "YES">
          </EnvironmentVariable>
       </EnvironmentVariables>
-      <AdditionalOptions>
-      </AdditionalOptions>
    </LaunchAction>
    <ProfileAction
       buildConfiguration = "Release"
diff --git a/Tests/Tests Mac/Info.plist b/Tests/Tests Mac/Info.plist
new file mode 100644
index 000000000..6c40a6cd0
--- /dev/null
+++ b/Tests/Tests Mac/Info.plist	
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>BNDL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+</dict>
+</plist>
diff --git a/Tests/Tests TV/Info.plist b/Tests/Tests TV/Info.plist
new file mode 100644
index 000000000..64d65ca49
--- /dev/null
+++ b/Tests/Tests TV/Info.plist	
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+</dict>
+</plist>
diff --git a/Tests/Tests Vision/Info.plist b/Tests/Tests Vision/Info.plist
new file mode 100644
index 000000000..64d65ca49
--- /dev/null
+++ b/Tests/Tests Vision/Info.plist	
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+</dict>
+</plist>
diff --git a/Tests/Tests/Images/1@2x.gif b/Tests/Tests/Images/1@2x.gif
new file mode 100644
index 000000000..9df64778b
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diff --git a/Tests/Tests/Images/IndexedPNG.png b/Tests/Tests/Images/IndexedPNG.png
new file mode 100644
index 000000000..8ed105e14
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diff --git a/Tests/Tests/MonochromeTestImage.jpg b/Tests/Tests/Images/MonochromeTestImage.jpg
similarity index 100%
rename from Tests/Tests/MonochromeTestImage.jpg
rename to Tests/Tests/Images/MonochromeTestImage.jpg
diff --git a/Tests/Tests/Images/RGBA16PNG.png b/Tests/Tests/Images/RGBA16PNG.png
new file mode 100644
index 000000000..1fde4ea10
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diff --git a/Tests/Tests/Images/TestAnimatedImageMemory.webp b/Tests/Tests/Images/TestAnimatedImageMemory.webp
new file mode 100644
index 000000000..0cd2f0ee5
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diff --git a/Tests/Tests/Images/TestEXIF.png b/Tests/Tests/Images/TestEXIF.png
new file mode 100644
index 000000000..e3d6bb6d5
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diff --git a/Tests/Tests/Images/TestHDR.avif b/Tests/Tests/Images/TestHDR.avif
new file mode 100644
index 000000000..6f082be1f
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diff --git a/Tests/Tests/Images/TestHDR.heic b/Tests/Tests/Images/TestHDR.heic
new file mode 100644
index 000000000..e6c2a3a25
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diff --git a/Tests/Tests/Images/TestHDR.jpeg b/Tests/Tests/Images/TestHDR.jpeg
new file mode 100644
index 000000000..495ea7017
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diff --git a/Tests/Tests/Images/TestHDR.jxl b/Tests/Tests/Images/TestHDR.jxl
new file mode 100644
index 000000000..b35c75c1b
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diff --git a/Tests/Tests/Images/TestICCProfile.jpg b/Tests/Tests/Images/TestICCProfile.jpg
new file mode 100644
index 000000000..8c36e70c3
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diff --git a/Tests/Tests/Images/TestImage.bmp b/Tests/Tests/Images/TestImage.bmp
new file mode 100644
index 000000000..524addd10
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diff --git a/Tests/Tests/TestImage.gif b/Tests/Tests/Images/TestImage.gif
similarity index 100%
rename from Tests/Tests/TestImage.gif
rename to Tests/Tests/Images/TestImage.gif
diff --git a/Tests/Tests/Images/TestImage.heic b/Tests/Tests/Images/TestImage.heic
new file mode 100644
index 000000000..f0bfa2270
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diff --git a/Tests/Tests/Images/TestImage.heif b/Tests/Tests/Images/TestImage.heif
new file mode 100644
index 000000000..b16f92bb5
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diff --git a/Tests/Tests/TestImage.jpg b/Tests/Tests/Images/TestImage.jpg
similarity index 100%
rename from Tests/Tests/TestImage.jpg
rename to Tests/Tests/Images/TestImage.jpg
diff --git a/Tests/Tests/Images/TestImage.nef b/Tests/Tests/Images/TestImage.nef
new file mode 100644
index 000000000..d5a881e7e
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diff --git a/Tests/Tests/Images/TestImage.pdf b/Tests/Tests/Images/TestImage.pdf
new file mode 100644
index 000000000..132681b06
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diff --git a/Tests/Tests/Images/TestImage.png b/Tests/Tests/Images/TestImage.png
new file mode 100644
index 000000000..a528ffcbf
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diff --git a/Tests/Tests/Images/TestImage.svg b/Tests/Tests/Images/TestImage.svg
new file mode 100644
index 000000000..acb906f95
--- /dev/null
+++ b/Tests/Tests/Images/TestImage.svg
@@ -0,0 +1,4 @@
+<svg xmlns='http://www.w3.org/2000/svg' viewBox="0 0 131 76">
+  <path d="M36,5l12,41l12-41h33v4l-13,21c30,10,2,69-21,28l7-2c15,27,33,-22,3,-19v-4l12-20h-15l-17,59h-1l-13-42l-12,42h-1l-20-67h9l12,41l8-28l-4-13h9" fill='#005A9C'/>
+  <path d="M94,53c15,32,30,14,35,7l-1-7c-16,26-32,3-34,0M122,16c-10-21-34,0-21,30c-5-30 16,-38 23,-21l5-10l-2-9"/>
+</svg>
diff --git a/Tests/Tests/Images/TestImageAnimated.apng b/Tests/Tests/Images/TestImageAnimated.apng
new file mode 100644
index 000000000..54f73736a
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diff --git a/Tests/Tests/Images/TestImageAnimated.heics b/Tests/Tests/Images/TestImageAnimated.heics
new file mode 100644
index 000000000..0dd31803f
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diff --git a/Tests/Tests/TestImageAnimated.webp b/Tests/Tests/Images/TestImageAnimated.webp
similarity index 100%
rename from Tests/Tests/TestImageAnimated.webp
rename to Tests/Tests/Images/TestImageAnimated.webp
diff --git a/Tests/Tests/TestImageLarge.jpg b/Tests/Tests/Images/TestImageLarge.jpg
similarity index 100%
rename from Tests/Tests/TestImageLarge.jpg
rename to Tests/Tests/Images/TestImageLarge.jpg
diff --git a/Tests/Tests/Images/TestImageLarge.png b/Tests/Tests/Images/TestImageLarge.png
new file mode 100644
index 000000000..4573dd8fa
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diff --git a/Tests/Tests/TestImageStatic.webp b/Tests/Tests/Images/TestImageStatic.webp
similarity index 100%
rename from Tests/Tests/TestImageStatic.webp
rename to Tests/Tests/Images/TestImageStatic.webp
diff --git a/Tests/Tests/Images/TestJFIF.jpg b/Tests/Tests/Images/TestJFIF.jpg
new file mode 100644
index 000000000..b0a23078d
Binary files /dev/null and b/Tests/Tests/Images/TestJFIF.jpg differ
diff --git a/Tests/Tests/Images/TestLoopCount.gif b/Tests/Tests/Images/TestLoopCount.gif
new file mode 100644
index 000000000..2bb545114
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diff --git a/Tests/Tests/SDAnimatedImageTest.m b/Tests/Tests/SDAnimatedImageTest.m
new file mode 100644
index 000000000..78530120d
--- /dev/null
+++ b/Tests/Tests/SDAnimatedImageTest.m
@@ -0,0 +1,893 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ * (c) Matt Galloway
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDTestCase.h"
+#import "SDInternalMacros.h"
+#import "SDImageFramePool.h"
+#import "SDWebImageTestTransformer.h"
+#import <KVOController/KVOController.h>
+
+static const NSUInteger kTestGIFFrameCount = 5; // local TestImage.gif loop count
+
+// Check whether the coder is called
+@interface SDImageAPNGTestCoder : SDImageAPNGCoder
+
+@property (nonatomic, class, assign) BOOL isCalled;
+
+@end
+
+@implementation SDImageAPNGTestCoder
+
+static BOOL _isCalled;
+
++ (BOOL)isCalled {
+    return _isCalled;
+}
+
++ (void)setIsCalled:(BOOL)isCalled {
+    _isCalled = isCalled;
+}
+
++ (instancetype)sharedCoder {
+    static SDImageAPNGTestCoder *coder;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        coder = [[SDImageAPNGTestCoder alloc] init];
+    });
+    return coder;
+}
+
+- (instancetype)initWithAnimatedImageData:(NSData *)data options:(SDImageCoderOptions *)options {
+    SDImageAPNGTestCoder.isCalled = YES;
+    return [super initWithAnimatedImageData:data options:options];
+}
+
+@end
+
+// Internal header
+@interface SDAnimatedImageView ()
+
+@property (nonatomic, assign) BOOL isProgressive;
+@property (nonatomic, strong) SDAnimatedImagePlayer *player;
+
+@end
+
+@interface SDAnimatedImagePlayer ()
+
+@property (nonatomic, strong) SDImageFramePool *framePool;
+
+@end
+
+@interface SDAnimatedImageTest : SDTestCase
+
+@end
+
+@implementation SDAnimatedImageTest
+
+- (void)test01AnimatedImageInitWithData {
+    NSData *invalidData = [@"invalid data" dataUsingEncoding:NSUTF8StringEncoding];
+    SDAnimatedImage *image = [[SDAnimatedImage alloc] initWithData:invalidData];
+    expect(image).beNil();
+    
+    NSData *validData = [self testGIFData];
+    image = [[SDAnimatedImage alloc] initWithData:validData scale:2];
+    expect(image).notTo.beNil(); // image
+    expect(image.scale).equal(2); // scale
+    expect(image.animatedImageData).equal(validData); // data
+    expect(image.animatedImageFormat).equal(SDImageFormatGIF); // format
+    expect(image.animatedImageLoopCount).equal(0); // loop count
+    expect(image.animatedImageFrameCount).equal(kTestGIFFrameCount); // frame count
+    expect([image animatedImageFrameAtIndex:1]).notTo.beNil(); // 1 frame
+}
+
+- (void)test02AnimatedImageInitWithContentsOfFile {
+    SDAnimatedImage *image = [[SDAnimatedImage alloc] initWithContentsOfFile:[self testGIFPath]];
+    expect(image).notTo.beNil();
+    expect(image.scale).equal(1); // scale
+    
+    // Test Retina File Path should result @2x scale
+    NSBundle *testBundle = [NSBundle bundleForClass:[self class]];
+    NSString *testPath = [testBundle pathForResource:@"1@2x" ofType:@"gif"];
+    image = [[SDAnimatedImage alloc] initWithContentsOfFile:testPath];
+    expect(image).notTo.beNil();
+    expect(image.scale).equal(2); // scale
+}
+
+- (void)test03AnimatedImageInitWithAnimatedCoder {
+    NSData *validData = [self testGIFData];
+    SDImageGIFCoder *coder = [[SDImageGIFCoder alloc] initWithAnimatedImageData:validData options:nil];
+    SDAnimatedImage *image = [[SDAnimatedImage alloc] initWithAnimatedCoder:coder scale:1];
+    expect(image).notTo.beNil();
+    // enough, other can be test with InitWithData
+}
+
+- (void)test04AnimatedImageImageNamed {
+    NSBundle *bundle = [NSBundle bundleForClass:[self class]];
+    expect([SDAnimatedImage imageNamed:@"TestImage.gif"]).beNil(); // Not in main bundle
+#if SD_UIKIT
+    SDAnimatedImage *image = [SDAnimatedImage imageNamed:@"TestImage.gif" inBundle:bundle compatibleWithTraitCollection:nil];
+#else
+    SDAnimatedImage *image = [SDAnimatedImage imageNamed:@"TestImage.gif" inBundle:bundle];
+#endif
+    expect(image).notTo.beNil();
+    expect([image.animatedImageData isEqualToData:[self testGIFData]]).beTruthy();
+}
+
+- (void)test05AnimatedImagePreloadFrames {
+    NSData *validData = [self testGIFData];
+    SDAnimatedImage *image = [SDAnimatedImage imageWithData:validData];
+    
+    // Preload all frames
+    [image preloadAllFrames];
+    
+    NSArray *loadedAnimatedImageFrames = [image valueForKey:@"loadedAnimatedImageFrames"]; // Access the internal property, only for test and may be changed in the future
+    expect(loadedAnimatedImageFrames.count).equal(kTestGIFFrameCount);
+    
+    // Test one frame
+    UIImage *frame = [image animatedImageFrameAtIndex:0];
+    expect(frame).notTo.beNil();
+    
+    // Unload all frames
+    [image unloadAllFrames];
+}
+
+- (void)test06AnimatedImageViewSetImage {
+    SDAnimatedImageView *imageView = [SDAnimatedImageView new];
+    UIImage *image = [[UIImage alloc] initWithData:[self testJPEGData]];
+    imageView.image = image;
+    expect(imageView.image).notTo.beNil();
+    expect(imageView.currentFrame).beNil(); // current frame
+}
+
+- (void)test08AnimatedImageViewSetAnimatedImageGIF {
+    SDAnimatedImageView *imageView = [SDAnimatedImageView new];
+    SDAnimatedImage *image = [SDAnimatedImage imageWithData:[self testGIFData]];
+    imageView.image = image;
+    expect(imageView.image).notTo.beNil();
+    expect(imageView.player).notTo.beNil();
+}
+
+- (void)test09AnimatedImageViewSetAnimatedImageAPNG {
+    SDAnimatedImageView *imageView = [SDAnimatedImageView new];
+    SDAnimatedImage *image = [SDAnimatedImage imageWithData:[self testAPNGPData]];
+    imageView.image = image;
+    expect(imageView.image).notTo.beNil();
+    expect(imageView.player).notTo.beNil();
+}
+
+- (void)test10AnimatedImageInitWithCoder {
+    SDAnimatedImage *image1 = [SDAnimatedImage imageWithContentsOfFile:[self testGIFPath]];
+    expect(image1).notTo.beNil();
+    NSMutableData *encodedData = [NSMutableData data];
+    NSKeyedArchiver *archiver  = [[NSKeyedArchiver alloc] initForWritingWithMutableData:encodedData];
+    archiver.requiresSecureCoding = YES;
+    [archiver encodeObject:image1 forKey:NSKeyedArchiveRootObjectKey];
+    [archiver finishEncoding];
+    expect(encodedData).notTo.beNil();
+    NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:encodedData];
+    unarchiver.requiresSecureCoding = YES;
+    SDAnimatedImage *image2 = [unarchiver decodeObjectOfClass:SDAnimatedImage.class forKey:NSKeyedArchiveRootObjectKey];
+    [unarchiver finishDecoding];
+    expect(image2).notTo.beNil();
+    
+    // Check each property
+    expect(image1.scale).equal(image2.scale);
+    expect(image1.size).equal(image2.size);
+    expect(image1.animatedImageFormat).equal(image2.animatedImageFormat);
+    expect(image1.animatedImageData).equal(image2.animatedImageData);
+    expect(image1.animatedImageLoopCount).equal(image2.animatedImageLoopCount);
+    expect(image1.animatedImageFrameCount).equal(image2.animatedImageFrameCount);
+}
+
+- (void)test11AnimatedImageViewIntrinsicContentSize {
+    // Test that SDAnimatedImageView.intrinsicContentSize return the correct value of image size
+    SDAnimatedImageView *imageView = [SDAnimatedImageView new];
+    SDAnimatedImage *image = [SDAnimatedImage imageWithData:[self testAPNGPData]];
+    imageView.image = image;
+    expect(imageView.intrinsicContentSize).equal(image.size);
+}
+
+- (void)test12AnimatedImageViewLayerContents {
+    // Test that SDAnimatedImageView with built-in UIImage/NSImage will actually setup the layer for display
+    SDAnimatedImageView *imageView = [SDAnimatedImageView new];
+    UIImage *image = [[UIImage alloc] initWithData:[self testJPEGData]];
+    imageView.image = image;
+#if SD_MAC
+    expect(imageView.wantsUpdateLayer).beTruthy();
+#else
+    expect(imageView.layer).notTo.beNil();
+#endif
+}
+
+- (void)test13AnimatedImageViewInitWithImage {
+    // Test that -[SDAnimatedImageView initWithImage:] this convenience initializer not crash
+    SDAnimatedImage *image = [SDAnimatedImage imageWithData:[self testAPNGPData]];
+    SDAnimatedImageView *imageView;
+#if SD_UIKIT
+    imageView = [[SDAnimatedImageView alloc] initWithImage:image];
+#else
+    if (@available(macOS 10.12, *)) {
+        imageView = [SDAnimatedImageView imageViewWithImage:image];
+    }
+#endif
+    expect(imageView.image).equal(image);
+}
+
+- (void)test14AnimatedImageViewStopPlayingWhenHidden {
+    SDAnimatedImageView *imageView = [SDAnimatedImageView new];
+#if SD_UIKIT
+    [self.window addSubview:imageView];
+#else
+    [self.window.contentView addSubview:imageView];
+#endif
+    SDAnimatedImage *image = [SDAnimatedImage imageWithData:[self testGIFData]];
+    imageView.image = image;
+#if SD_UIKIT
+    [imageView startAnimating];
+#else
+    imageView.animates = YES;
+#endif
+    SDAnimatedImagePlayer *player = imageView.player;
+    expect(player).notTo.beNil();
+    expect(player.isPlaying).beTruthy();
+    imageView.hidden = YES;
+    expect(player.isPlaying).beFalsy();
+}
+
+- (void)test20AnimatedImageViewRendering {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"test SDAnimatedImageView rendering"];
+    SDAnimatedImageView *imageView = [[SDAnimatedImageView alloc] init];
+#if SD_UIKIT
+    [self.window addSubview:imageView];
+#else
+    [self.window.contentView addSubview:imageView];
+#endif
+    
+    NSMutableDictionary *frames = [NSMutableDictionary dictionaryWithCapacity:kTestGIFFrameCount];
+    
+    [self.KVOController observe:imageView keyPaths:@[NSStringFromSelector(@selector(currentFrameIndex)), NSStringFromSelector(@selector(currentLoopCount))] options:NSKeyValueObservingOptionNew block:^(id  _Nullable observer, id  _Nonnull object, NSDictionary<NSString *,id> * _Nonnull change) {
+        NSUInteger frameIndex = imageView.currentFrameIndex;
+        NSUInteger loopCount = imageView.currentLoopCount;
+        [frames setObject:@(YES) forKey:@(frameIndex)];
+        
+        BOOL framesRendered = NO;
+        if (frames.count >= kTestGIFFrameCount) {
+            // All frames rendered
+            framesRendered = YES;
+        }
+        BOOL loopFinished = NO;
+        if (loopCount >= 1) {
+            // One loop finished
+            loopFinished = YES;
+        }
+        if (framesRendered && loopFinished) {
+#if SD_UIKIT
+            [imageView stopAnimating];
+#else
+            imageView.animates = NO;
+#endif
+            [imageView removeFromSuperview];
+            [expectation fulfill];
+        }
+    }];
+    
+    SDAnimatedImage *image = [SDAnimatedImage imageWithData:[self testGIFData]];
+    imageView.image = image;
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test21AnimatedImageViewSetProgressiveAnimatedImage {
+    NSData *gifData = [self testGIFData];
+    SDImageGIFCoder *progressiveCoder = [[SDImageGIFCoder alloc] initIncrementalWithOptions:nil];
+    // simulate progressive decode, pass partial data
+    NSData *partialData = [gifData subdataWithRange:NSMakeRange(0, gifData.length - 1)];
+    [progressiveCoder updateIncrementalData:partialData finished:NO];
+    
+    SDAnimatedImage *partialImage = [[SDAnimatedImage alloc] initWithAnimatedCoder:progressiveCoder scale:1];
+    partialImage.sd_isIncremental = YES;
+    
+    SDAnimatedImageView *imageView = [[SDAnimatedImageView alloc] init];
+    imageView.image = partialImage;
+    
+    BOOL isProgressive = imageView.isProgressive;
+    expect(isProgressive).equal(YES);
+    
+    // pass full data
+    [progressiveCoder updateIncrementalData:gifData finished:YES];
+    
+    SDAnimatedImage *fullImage = [[SDAnimatedImage alloc] initWithAnimatedCoder:progressiveCoder scale:1];
+    
+    imageView.image = fullImage;
+    
+    isProgressive = imageView.isProgressive;
+    expect(isProgressive).equal(NO);
+}
+
+- (void)test22AnimatedImageViewCategory {
+    if (SDTestCase.isCI) {
+        // This case cause random failure on GitHub Action only (but not local testing). Disabled for now
+        return;
+    }
+    XCTestExpectation *expectation = [self expectationWithDescription:@"test SDAnimatedImageView view category"];
+    SDAnimatedImageView *imageView = [SDAnimatedImageView new];
+    NSURL *testURL = [NSURL URLWithString:@"https://media.giphy.com/media/3oeji6siihbdrxxi40/giphy.gif"];
+    [SDImageCache.sharedImageCache removeImageFromMemoryForKey:testURL.absoluteString];
+    [SDImageCache.sharedImageCache removeImageFromDiskForKey:testURL.absoluteString];
+    // I don't know why, but `fromLoaderOnly` is need for iOS Unit Test on GitHub Action
+    [imageView sd_setImageWithURL:testURL placeholderImage:nil options:SDWebImageFromLoaderOnly completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+        expect(error).to.beNil();
+        expect(image).notTo.beNil();
+        expect([image isKindOfClass:[SDAnimatedImage class]]).beTruthy();
+        [expectation fulfill];
+    }];
+    [self waitForExpectationsWithTimeout:kAsyncTestTimeout * 2 handler:nil];
+}
+
+- (void)test23AnimatedImageViewCategoryProgressive {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"test SDAnimatedImageView view category progressive"];
+    SDAnimatedImageView *imageView = [SDAnimatedImageView new];
+    NSURL *testURL = [NSURL URLWithString:@"https://media.giphy.com/media/UEsrLdv7ugRTq/giphy.gif"];
+    [SDImageCache.sharedImageCache removeImageFromMemoryForKey:testURL.absoluteString];
+    [SDImageCache.sharedImageCache removeImageFromDiskForKey:testURL.absoluteString];
+    [imageView sd_setImageWithURL:testURL placeholderImage:nil options:SDWebImageProgressiveLoad progress:^(NSInteger receivedSize, NSInteger expectedSize, NSURL * _Nullable targetURL) {
+        dispatch_async(dispatch_get_main_queue(), ^{
+            UIImage *image = imageView.image;
+            // Progressive image may be nil when download data is not enough
+            if (image) {
+                expect(image.sd_isIncremental).beTruthy();
+                expect([image.class conformsToProtocol:@protocol(SDAnimatedImage)]).beTruthy();
+                BOOL isProgressive = imageView.isProgressive;
+                expect(isProgressive).equal(YES);
+            }
+        });
+    } completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+        expect(error).to.beNil();
+        expect(image).notTo.beNil();
+        expect([image isKindOfClass:[SDAnimatedImage class]]).beTruthy();
+        expect(cacheType).equal(SDImageCacheTypeNone);
+        [expectation fulfill];
+    }];
+    [self waitForExpectationsWithTimeout:kAsyncTestTimeout * 2 handler:nil];
+}
+
+- (void)test24AnimatedImageViewCategoryDiskCache {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"test SDAnimatedImageView view category disk cache"];
+    SDAnimatedImageView *imageView = [SDAnimatedImageView new];
+    NSURL *testURL = [NSURL URLWithString:@"https://foobar.non-exists.org/bizbuz.gif"];
+    NSString *testKey = testURL.absoluteString;
+    [SDImageCache.sharedImageCache removeImageFromMemoryForKey:testKey];
+    [SDImageCache.sharedImageCache removeImageFromDiskForKey:testKey];
+    NSData *imageData = [self testGIFData];
+    [SDImageCache.sharedImageCache storeImageDataToDisk:imageData forKey:testKey];
+    [imageView sd_setImageWithURL:testURL placeholderImage:nil completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+        expect(error).to.beNil();
+        expect(image).notTo.beNil();
+        expect(cacheType).equal(SDImageCacheTypeDisk);
+        expect([image isKindOfClass:[SDAnimatedImage class]]).beTruthy();
+        [SDImageCache.sharedImageCache removeImageFromMemoryForKey:testKey];
+        [SDImageCache.sharedImageCache removeImageFromDiskForKey:testKey];
+        [expectation fulfill];
+    }];
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test25AnimatedImageStopAnimatingNormal {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"test SDAnimatedImageView stopAnimating normal behavior"];
+    
+    SDAnimatedImageView *imageView = [SDAnimatedImageView new];
+    
+#if SD_UIKIT
+    [self.window addSubview:imageView];
+#else
+    [self.window.contentView addSubview:imageView];
+#endif
+    // This APNG duration is 2s
+    SDAnimatedImage *image = [SDAnimatedImage imageWithData:[self testAPNGPData]];
+    imageView.image = image;
+    
+    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
+        // 0.5s is not finished, frame index should not be 0
+        expect(imageView.player.framePool.currentFrameCount).beGreaterThan(0);
+        expect(imageView.currentFrameIndex).beGreaterThan(0);
+    });
+    
+    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
+#if SD_UIKIT
+        [imageView stopAnimating];
+#else
+        imageView.animates = NO;
+#endif
+        expect(imageView.player.framePool.currentFrameCount).beGreaterThan(0);
+        expect(imageView.currentFrameIndex).beGreaterThan(0);
+        
+        [imageView removeFromSuperview];
+        [expectation fulfill];
+    });
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test26AnimatedImageStopAnimatingClearBuffer {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"test SDAnimatedImageView stopAnimating clear buffer when stopped"];
+    
+    SDAnimatedImageView *imageView = [SDAnimatedImageView new];
+    imageView.clearBufferWhenStopped = YES;
+    imageView.resetFrameIndexWhenStopped = YES;
+    
+#if SD_UIKIT
+    [self.window addSubview:imageView];
+#else
+    [self.window.contentView addSubview:imageView];
+#endif
+    // This APNG duration is 2s
+    SDAnimatedImage *image = [SDAnimatedImage imageWithData:[self testAPNGPData]];
+    imageView.image = image;
+    
+    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
+        // 0.5s is not finished, frame index should not be 0
+        expect(imageView.player.framePool.currentFrameCount).beGreaterThan(0);
+        expect(imageView.currentFrameIndex).beGreaterThan(0);
+    });
+    
+    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
+#if SD_UIKIT
+        [imageView stopAnimating];
+#else
+        imageView.animates = NO;
+#endif
+        expect(imageView.player.framePool.currentFrameCount).equal(0);
+        
+        [imageView removeFromSuperview];
+        [expectation fulfill];
+    });
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test27AnimatedImageProgressiveAnimation {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"test SDAnimatedImageView progressive animation rendering"];
+    
+    // Simulate progressive download
+    NSData *fullData = [self testAPNGPData];
+    NSUInteger length = fullData.length;
+    
+    SDAnimatedImageView *imageView = [SDAnimatedImageView new];
+#if SD_UIKIT
+    [self.window addSubview:imageView];
+#else
+    [self.window.contentView addSubview:imageView];
+#endif
+    
+    __block NSUInteger previousFrameIndex = 0;
+    @weakify(imageView);
+    // Observe to check rendering behavior using frame index
+    [self.KVOController observe:imageView keyPath:NSStringFromSelector(@selector(currentFrameIndex)) options:NSKeyValueObservingOptionNew block:^(id  _Nullable observer, id  _Nonnull object, NSDictionary<NSString *,id> * _Nonnull change) {
+        @strongify(imageView);
+        NSUInteger currentFrameIndex = [change[NSKeyValueChangeNewKey] unsignedIntegerValue];
+        printf("Animation Frame Index: %lu\n", (unsigned long)currentFrameIndex);
+        
+        // The last time should not be progressive
+        if (currentFrameIndex == 0 && !imageView.isProgressive) {
+            [self.KVOController unobserve:imageView];
+            [expectation fulfill];
+        } else {
+            // Each progressive rendering should render new frame index, no backward and should stop at last frame index
+            expect(currentFrameIndex - previousFrameIndex).beGreaterThanOrEqualTo(0);
+            previousFrameIndex = currentFrameIndex;
+        }
+    }];
+    
+    SDImageAPNGCoder *coder = [[SDImageAPNGCoder alloc] initIncrementalWithOptions:nil];
+    // Setup Data
+    NSData *setupData = [fullData subdataWithRange:NSMakeRange(0, length / 3.0)];
+    [coder updateIncrementalData:setupData finished:NO];
+    imageView.shouldIncrementalLoad = YES;
+    __block SDAnimatedImage *progressiveImage = [[SDAnimatedImage alloc] initWithAnimatedCoder:coder scale:1];
+    progressiveImage.sd_isIncremental = YES;
+    imageView.image = progressiveImage;
+    expect(imageView.isProgressive).beTruthy();
+    
+    __block NSUInteger partialFrameCount;
+    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
+        // Partial Data
+        NSData *partialData = [fullData subdataWithRange:NSMakeRange(0, length * 2.0 / 3.0)];
+        [coder updateIncrementalData:partialData finished:NO];
+        partialFrameCount = [coder animatedImageFrameCount];
+        expect(partialFrameCount).beGreaterThan(1);
+        progressiveImage = [[SDAnimatedImage alloc] initWithAnimatedCoder:coder scale:1];
+        progressiveImage.sd_isIncremental = YES;
+        imageView.image = progressiveImage;
+        expect(imageView.isProgressive).beTruthy();
+    });
+    
+    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(4 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
+        // Full Data
+        [coder updateIncrementalData:fullData finished:YES];
+        progressiveImage = [[SDAnimatedImage alloc] initWithAnimatedCoder:coder scale:1];
+        progressiveImage.sd_isIncremental = NO;
+        imageView.image = progressiveImage;
+        NSUInteger fullFrameCount = [coder animatedImageFrameCount];
+        expect(fullFrameCount).beGreaterThan(partialFrameCount);
+        expect(imageView.isProgressive).beFalsy();
+    });
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test28AnimatedImageAutoPlayAnimatedImage {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"test SDAnimatedImageView AutoPlayAnimatedImage behavior"];
+    
+    SDAnimatedImageView *imageView = [SDAnimatedImageView new];
+    imageView.autoPlayAnimatedImage = NO;
+    
+#if SD_UIKIT
+    [self.window addSubview:imageView];
+#else
+    [self.window.contentView addSubview:imageView];
+#endif
+    // This APNG duration is 2s
+    SDAnimatedImage *image = [SDAnimatedImage imageWithData:[self testAPNGPData]];
+    imageView.image = image;
+
+    #if SD_UIKIT
+        expect(imageView.animating).equal(NO);
+    #else
+        expect(imageView.animates).equal(NO);
+    #endif
+    
+    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
+        #if SD_UIKIT
+            expect(imageView.animating).equal(NO);
+        #else
+            expect(imageView.animates).equal(NO);
+        #endif
+        
+        #if SD_UIKIT
+            [imageView startAnimating];
+        #else
+            imageView.animates = YES;
+        #endif
+    });
+    
+    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
+        #if SD_UIKIT
+            expect(imageView.animating).equal(YES);
+        #else
+            expect(imageView.animates).equal(YES);
+        #endif
+        
+        #if SD_UIKIT
+            [imageView stopAnimating];
+        #else
+            imageView.animates = NO;
+        #endif
+        
+        [imageView removeFromSuperview];
+        [expectation fulfill];
+    });
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test29AnimatedImageSeekFrame {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"test SDAnimatedImageView stopAnimating normal behavior"];
+    
+    SDAnimatedImageView *imageView = [SDAnimatedImageView new];
+    
+#if SD_UIKIT
+    [self.window addSubview:imageView];
+#else
+    [self.window.contentView addSubview:imageView];
+#endif
+    // seeking through local image should return non-null images
+    SDAnimatedImage *image = [SDAnimatedImage imageWithData:[self testAPNGPData]];
+    imageView.autoPlayAnimatedImage = NO;
+    imageView.image = image;
+    
+    __weak SDAnimatedImagePlayer *player = imageView.player;
+
+    __block NSUInteger i = 0;
+    [player setAnimationFrameHandler:^(NSUInteger index, UIImage * _Nonnull frame) {
+        expect(index).equal(i);
+        expect(frame).notTo.beNil();
+        i++;
+        if (i < player.totalFrameCount) {
+            [player seekToFrameAtIndex:i loopCount:0];
+        } else {
+            [expectation fulfill];
+        }
+    }];
+    [player seekToFrameAtIndex:i loopCount:0];
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test30AnimatedImageCoderPriority {
+    [SDImageCodersManager.sharedManager addCoder:SDImageAPNGTestCoder.sharedCoder];
+    [SDAnimatedImage imageWithData:[self testAPNGPData]];
+    expect(SDImageAPNGTestCoder.isCalled).equal(YES);
+}
+
+#if SD_UIKIT
+- (void)test31AnimatedImageViewSetAnimationImages {
+    SDAnimatedImageView *imageView = [SDAnimatedImageView new];
+    UIImage *image = [[UIImage alloc] initWithData:[self testJPEGData]];
+    imageView.animationImages = @[image];
+    expect(imageView.animationImages).notTo.beNil();
+}
+
+- (void)test32AnimatedImageViewNotStopPlayingAnimationImagesWhenHidden {
+    SDAnimatedImageView *imageView = [SDAnimatedImageView new];
+    [self.window addSubview:imageView];
+    UIImage *image = [[UIImage alloc] initWithData:[self testJPEGData]];
+    imageView.animationImages = @[image];
+    [imageView startAnimating];
+    expect(imageView.animating).beTruthy();
+    imageView.hidden = YES;
+    expect(imageView.animating).beTruthy();
+}
+#endif
+
+- (void)test33AnimatedImagePlaybackModeReverse {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"test SDAnimatedImageView playback reverse mode"];
+    
+    SDAnimatedImageView *imageView = [SDAnimatedImageView new];
+    
+#if SD_UIKIT
+    [self.window addSubview:imageView];
+#else
+    [self.window.contentView addSubview:imageView];
+#endif
+    
+    SDAnimatedImage *image = [SDAnimatedImage imageWithData:[self testAPNGPData]];
+    imageView.autoPlayAnimatedImage = NO;
+    imageView.image = image;
+    
+    __weak SDAnimatedImagePlayer *player = imageView.player;
+    player.playbackMode = SDAnimatedImagePlaybackModeReverse;
+
+    __block NSInteger i = player.totalFrameCount - 1;
+    __weak typeof(imageView) wimageView = imageView;
+    [player setAnimationFrameHandler:^(NSUInteger index, UIImage * _Nonnull frame) {
+        expect(index).equal(i);
+        expect(frame).notTo.beNil();
+        if (index == 0) {
+            [expectation fulfill];
+            // Stop Animation to avoid extra callback
+            [wimageView.player stopPlaying];
+            [wimageView removeFromSuperview];
+            return;
+        }
+        i--;
+    }];
+    
+    [player startPlaying];
+    
+    [self waitForExpectationsWithTimeout:15 handler:nil];
+}
+
+- (void)test34AnimatedImagePlaybackModeBounce {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"test SDAnimatedImageView playback bounce mode"];
+    
+    SDAnimatedImageView *imageView = [SDAnimatedImageView new];
+    
+#if SD_UIKIT
+    [self.window addSubview:imageView];
+#else
+    [self.window.contentView addSubview:imageView];
+#endif
+    
+    SDAnimatedImage *image = [SDAnimatedImage imageWithData:[self testAPNGPData]];
+    imageView.autoPlayAnimatedImage = NO;
+    imageView.image = image;
+    
+    __weak SDAnimatedImagePlayer *player = imageView.player;
+    player.playbackMode = SDAnimatedImagePlaybackModeBounce;
+
+    __block NSInteger i = 0;
+    __block BOOL flag = NO;
+    __block NSUInteger cnt = 0;
+    __weak typeof(imageView) wimageView = imageView;
+    [player setAnimationFrameHandler:^(NSUInteger index, UIImage * _Nonnull frame) {
+        expect(index).equal(i);
+        expect(frame).notTo.beNil();
+        
+        if (index >= player.totalFrameCount - 1) {
+            cnt++;
+            flag = YES;
+        } else if (cnt != 0 && index == 0) {
+            cnt++;
+            flag = NO;
+        }
+        
+        if (!flag) {
+            i++;
+        } else {
+            i--;
+        }
+
+        if (cnt >= 2) {
+            [expectation fulfill];
+            // Stop Animation to avoid extra callback
+            [wimageView.player stopPlaying];
+            [wimageView removeFromSuperview];
+        }
+    }];
+    
+    [player startPlaying];
+    
+    [self waitForExpectationsWithTimeout:15 handler:nil];
+}
+
+- (void)test35AnimatedImagePlaybackModeReversedBounce {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"test SDAnimatedImageView playback reverse bounce mode"];
+    
+    SDAnimatedImageView *imageView = [SDAnimatedImageView new];
+    
+#if SD_UIKIT
+    [self.window addSubview:imageView];
+#else
+    [self.window.contentView addSubview:imageView];
+#endif
+    
+    SDAnimatedImage *image = [SDAnimatedImage imageWithData:[self testAPNGPData]];
+    imageView.autoPlayAnimatedImage = NO;
+    imageView.image = image;
+    
+    __weak SDAnimatedImagePlayer *player = imageView.player;
+    player.playbackMode = SDAnimatedImagePlaybackModeReversedBounce;
+
+    __block NSInteger i = player.totalFrameCount - 1;
+    __block BOOL flag = false;
+    __block NSUInteger cnt = 0;
+    __weak typeof(imageView) wimageView = imageView;
+    [player setAnimationFrameHandler:^(NSUInteger index, UIImage * _Nonnull frame) {
+        expect(index).equal(i);
+        expect(frame).notTo.beNil();
+        
+        if (cnt != 0 && index >= player.totalFrameCount - 1) {
+            cnt++;
+            flag = false;
+        } else if (index == 0) {
+            cnt++;
+            flag = YES;
+        }
+        
+        if (flag) {
+            i++;
+        } else {
+            i--;
+        }
+
+        if (cnt >= 2) {
+            [expectation fulfill];
+            // Stop Animation to avoid extra callback
+            [wimageView.player stopPlaying];
+            [wimageView removeFromSuperview];
+        }
+    }];
+    [player startPlaying];
+    
+    [self waitForExpectationsWithTimeout:15 handler:nil];
+}
+
+#if !SD_TV
+- (void)test36AnimatedImageMemoryCost {
+    if (@available(iOS 14, tvOS 14, macOS 11, watchOS 7, *)) {
+        [[SDImageCodersManager sharedManager] addCoder:[SDImageAWebPCoder sharedCoder]];
+        UIImage *image = [UIImage sd_imageWithData:[NSData dataWithContentsOfFile:[self testMemotyCostImagePath]]];
+        NSUInteger cost = [image sd_memoryCost];
+#if SD_UIKIT
+        expect(image.images.count).equal(5333);
+#endif
+        expect(image.sd_imageFrameCount).equal(16);
+        expect(image.scale).equal(1);
+#if SD_MAC
+        /// Frame count is 1 in mac.
+        expect(cost).equal(image.size.width * image.size.height * 4);
+#else
+        expect(cost).equal(16 * image.size.width * image.size.height * 4);
+#endif
+        [[SDImageCodersManager sharedManager] removeCoder:[SDImageAWebPCoder sharedCoder]];
+    }
+}
+#endif
+
+- (void)test37AnimatedImageWithStaticDataBehavior {
+    UIImage *image = [[SDAnimatedImage alloc] initWithData:[self testJPEGData]];
+    // UIImage+Metadata.h
+    expect(image).notTo.beNil();
+    expect(image.sd_isAnimated).beFalsy();
+    expect(image.sd_imageFormat).equal(SDImageFormatJPEG);
+    expect(image.sd_imageFrameCount).equal(1);
+    expect(image.sd_imageLoopCount).equal(0);
+    // SDImageCoderHelper.h
+    UIImage *decodedImage = [SDImageCoderHelper decodedImageWithImage:image policy:SDImageForceDecodePolicyAutomatic];
+    expect(decodedImage).notTo.equal(image);
+    // SDWebImageDefine.h
+    UIImage *scaledImage = SDScaledImageForScaleFactor(2.0, image);
+    expect(scaledImage).notTo.equal(image);
+}
+
+- (void)testAnimationTransformerWorks {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"test SDAnimatedImageView animationTransformer works"];
+    SDAnimatedImageView *imageView = [SDAnimatedImageView new];
+    // Setup transformer, showing which hook all frames into the test image
+    UIImage *testImage = [[UIImage alloc] initWithData:[self testJPEGData]];
+    SDWebImageTestTransformer *transformer = [SDWebImageTestTransformer new];
+    transformer.testImage = testImage;
+    imageView.animationTransformer = transformer;
+    
+#if SD_UIKIT
+    [self.window addSubview:imageView];
+#else
+    [self.window.contentView addSubview:imageView];
+#endif
+    SDAnimatedImage *image = [SDAnimatedImage imageWithData:[self testGIFData]];
+    imageView.image = image;
+#if SD_UIKIT
+    [imageView startAnimating];
+#else
+    imageView.animates = YES;
+#endif
+    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
+        // 0.5s is not finished, frame index should not be 0
+        expect(imageView.player.framePool.currentFrameCount).beGreaterThan(0);
+        expect(imageView.currentFrameIndex).beGreaterThan(0);
+        // Test the current frame image is hooked by transformer
+        expect(imageView.currentFrame).equal(testImage);
+        
+        [expectation fulfill];
+    });
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+#pragma mark - Helper
+
+- (NSString *)testGIFPath {
+    NSBundle *testBundle = [NSBundle bundleForClass:[self class]];
+    NSString *testPath = [testBundle pathForResource:@"TestImage" ofType:@"gif"];
+    return testPath;
+}
+
+- (NSData *)testGIFData {
+    NSData *testData = [NSData dataWithContentsOfFile:[self testGIFPath]];
+    return testData;
+}
+
+- (NSString *)testAPNGPPath {
+    NSBundle *testBundle = [NSBundle bundleForClass:[self class]];
+    NSString *testPath = [testBundle pathForResource:@"TestImageAnimated" ofType:@"apng"];
+    return testPath;
+}
+
+- (NSString *)testMemotyCostImagePath {
+    NSBundle *testBundle = [NSBundle bundleForClass:[self class]];
+    NSString *testPath = [testBundle pathForResource:@"TestAnimatedImageMemory" ofType:@"webp"];
+    return testPath;
+}
+
+- (NSData *)testAPNGPData {
+    return [NSData dataWithContentsOfFile:[self testAPNGPPath]];
+}
+
+- (NSString *)testJPEGPath {
+    NSBundle *testBundle = [NSBundle bundleForClass:[self class]];
+    NSString *testPath = [testBundle pathForResource:@"TestImage" ofType:@"jpg"];
+    return testPath;
+}
+
+- (NSData *)testJPEGData {
+    NSData *testData = [NSData dataWithContentsOfFile:[self testJPEGPath]];
+    return testData;
+}
+
+@end
diff --git a/Tests/Tests/SDCategoriesTests.m b/Tests/Tests/SDCategoriesTests.m
index d619c8868..7d96659c0 100644
--- a/Tests/Tests/SDCategoriesTests.m
+++ b/Tests/Tests/SDCategoriesTests.m
@@ -8,14 +8,10 @@
  */
 
 #import "SDTestCase.h"
-#import <SDWebImage/UIImageView+WebCache.h>
-#import <SDWebImage/UIImageView+HighlightedWebCache.h>
-#import <SDWebImage/MKAnnotationView+WebCache.h>
-#import <SDWebImage/UIButton+WebCache.h>
-#import <SDWebImage/FLAnimatedImageView+WebCache.h>
-#import <SDWebImage/UIView+WebCache.h>
-
-static void * SDCategoriesTestsContext = &SDCategoriesTestsContext;
+#if SD_UIKIT
+#import <MobileCoreServices/MobileCoreServices.h>
+#endif
+#import "SDImageIOAnimatedCoderInternal.h"
 
 @interface SDCategoriesTests : SDTestCase
 
@@ -23,156 +19,60 @@ @interface SDCategoriesTests : SDTestCase
 
 @implementation SDCategoriesTests
 
-- (void)testUIImageViewSetImageWithURL {
-    XCTestExpectation *expectation = [self expectationWithDescription:@"UIImageView setImageWithURL"];
+- (void)test01NSDataImageContentTypeCategory {
+    // Test invalid image data
+    SDImageFormat format = [NSData sd_imageFormatForImageData:nil];
+    expect(format == SDImageFormatUndefined);
     
-    UIImageView *imageView = [[UIImageView alloc] init];
-    NSURL *originalImageURL = [NSURL URLWithString:kTestJpegURL];
-    [imageView sd_setImageWithURL:originalImageURL
-                        completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
-                            expect(image).toNot.beNil();
-                            expect(error).to.beNil();
-                            expect(originalImageURL).to.equal(imageURL);
-                            expect(imageView.image).to.equal(image);
-                            [expectation fulfill];
-                        }];
-    [self waitForExpectationsWithCommonTimeout];
+    // Test invalid format
+    CFStringRef type = [NSData sd_UTTypeFromImageFormat:SDImageFormatUndefined];
+    expect(CFStringCompare(kSDUTTypeImage, type, 0)).equal(kCFCompareEqualTo);
+    expect([NSData sd_imageFormatFromUTType:kSDUTTypeImage]).equal(SDImageFormatUndefined);
 }
 
-- (void)testUIImageViewSetHighlightedImageWithURL {
-    XCTestExpectation *expectation = [self expectationWithDescription:@"UIImageView setHighlightedImageWithURL"];
-    
-    UIImageView *imageView = [[UIImageView alloc] init];
-    NSURL *originalImageURL = [NSURL URLWithString:kTestJpegURL];
-    [imageView sd_setHighlightedImageWithURL:originalImageURL
-                                   completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
-                                       expect(image).toNot.beNil();
-                                       expect(error).to.beNil();
-                                       expect(originalImageURL).to.equal(imageURL);
-                                       expect(imageView.highlightedImage).to.equal(image);
-                                       [expectation fulfill];
-                                   }];
-    [self waitForExpectationsWithCommonTimeout];
+- (void)test02UIImageMultiFormatCategory {
+    // Test invalid image data
+    UIImage *image = [UIImage sd_imageWithData:nil];
+    expect(image).to.beNil();
+    // Test image encode
+    image = [[UIImage alloc] initWithContentsOfFile:[self testJPEGPath]];
+    NSData *data = [image sd_imageData];
+    expect(data).notTo.beNil();
+    // Test image encode PNG
+    data = [image sd_imageDataAsFormat:SDImageFormatPNG];
+    expect(data).notTo.beNil();
+    // Test image decode PNG
+    expect([UIImage sd_imageWithData:data scale:1 firstFrameOnly:YES]).notTo.beNil();
+    // Test image encode JPEG with compressionQuality
+    NSData *jpegData1 = [image sd_imageDataAsFormat:SDImageFormatJPEG compressionQuality:1];
+    NSData *jpegData2 = [image sd_imageDataAsFormat:SDImageFormatJPEG compressionQuality:0.5];
+    expect(jpegData1).notTo.beNil();
+    expect(jpegData2).notTo.beNil();
+    expect(jpegData1.length).notTo.equal(jpegData2.length);
 }
 
-- (void)testMKAnnotationViewSetImageWithURL {
-    XCTestExpectation *expectation = [self expectationWithDescription:@"MKAnnotationView setImageWithURL"];
-    
-    MKAnnotationView *annotationView = [[MKAnnotationView alloc] init];
-    NSURL *originalImageURL = [NSURL URLWithString:kTestJpegURL];
-    [annotationView sd_setImageWithURL:originalImageURL
-                             completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
-                                 expect(image).toNot.beNil();
-                                 expect(error).to.beNil();
-                                 expect(originalImageURL).to.equal(imageURL);
-                                 expect(annotationView.image).to.equal(image);
-                                 [expectation fulfill];
-                             }];
-    [self waitForExpectationsWithCommonTimeout];
+- (void)test03UIImageGIFCategory {
+    // Test invalid image data
+    UIImage *image = [UIImage sd_imageWithGIFData:nil];
+    expect(image).to.beNil();
+    // Test valid image data
+    NSData *data = [NSData dataWithContentsOfFile:[self testGIFPath]];
+    image = [UIImage sd_imageWithGIFData:data];
+    expect(image).notTo.beNil();
+    expect(image.sd_isAnimated).beTruthy();
+    expect(image.sd_imageFrameCount).equal(5);
 }
 
-- (void)testUIButtonSetImageWithURLNormalState {
-    XCTestExpectation *expectation = [self expectationWithDescription:@"UIButton setImageWithURL normalState"];
-    
-    UIButton *button = [[UIButton alloc] init];
-    NSURL *originalImageURL = [NSURL URLWithString:kTestJpegURL];
-    [button sd_setImageWithURL:originalImageURL
-                      forState:UIControlStateNormal
-                     completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
-                         expect(image).toNot.beNil();
-                         expect(error).to.beNil();
-                         expect(originalImageURL).to.equal(imageURL);
-                         expect([button imageForState:UIControlStateNormal]).to.equal(image);
-                         [expectation fulfill];
-                     }];
-    [self waitForExpectationsWithCommonTimeout];
-}
+#pragma mark - Helper
 
-- (void)testUIButtonSetImageWithURLHighlightedState {
-    XCTestExpectation *expectation = [self expectationWithDescription:@"UIButton setImageWithURL highlightedState"];
-    
-    UIButton *button = [[UIButton alloc] init];
-    NSURL *originalImageURL = [NSURL URLWithString:kTestJpegURL];
-    [button sd_setImageWithURL:originalImageURL
-                      forState:UIControlStateHighlighted
-                     completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
-                         expect(image).toNot.beNil();
-                         expect(error).to.beNil();
-                         expect(originalImageURL).to.equal(imageURL);
-                         expect([button imageForState:UIControlStateHighlighted]).to.equal(image);
-                         [expectation fulfill];
-                     }];
-    [self waitForExpectationsWithCommonTimeout];
-}
-
-- (void)testUIButtonSetBackgroundImageWithURLNormalState {
-    XCTestExpectation *expectation = [self expectationWithDescription:@"UIButton setBackgroundImageWithURL normalState"];
-    
-    UIButton *button = [[UIButton alloc] init];
-    NSURL *originalImageURL = [NSURL URLWithString:kTestJpegURL];
-    [button sd_setBackgroundImageWithURL:originalImageURL
-                                forState:UIControlStateNormal
-                               completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
-                                   expect(image).toNot.beNil();
-                                   expect(error).to.beNil();
-                                   expect(originalImageURL).to.equal(imageURL);
-                                   expect([button backgroundImageForState:UIControlStateNormal]).to.equal(image);
-                                   [expectation fulfill];
-                               }];
-    [self waitForExpectationsWithCommonTimeout];
-}
-
-- (void)testFLAnimatedImageViewSetImageWithURL {
-    XCTestExpectation *expectation = [self expectationWithDescription:@"FLAnimatedImageView setImageWithURL"];
-    
-    FLAnimatedImageView *imageView = [[FLAnimatedImageView alloc] init];
-    NSURL *originalImageURL = [NSURL URLWithString:@"https://www.interntheory.com/img/loading-small.gif"];
-    
-    [imageView sd_setImageWithURL:originalImageURL
-                        completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
-                            expect(image).toNot.beNil();
-                            expect(error).to.beNil();
-                            expect(originalImageURL).to.equal(imageURL);
-                            
-                            expect(imageView.animatedImage).toNot.beNil();
-                            [expectation fulfill];
-                                }];
-    [self waitForExpectationsWithCommonTimeout];
-}
-
-- (void)testUIViewImageProgressKVOWork {
-    XCTestExpectation *expectation = [self expectationWithDescription:@"UIView imageProgressKVO failed"];
-    UIView *view = [[UIView alloc] init];
-    NSURL *originalImageURL = [NSURL URLWithString:kTestJpegURL];
-    
-    [view.sd_imageProgress addObserver:self forKeyPath:NSStringFromSelector(@selector(fractionCompleted)) options:NSKeyValueObservingOptionNew context:SDCategoriesTestsContext];
-    
-    // Clear the disk cache to force download from network
-    [[SDImageCache sharedImageCache] removeImageForKey:kTestJpegURL withCompletion:^{
-        [view sd_internalSetImageWithURL:originalImageURL placeholderImage:nil options:0 operationKey:nil setImageBlock:nil progress:nil completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
-            expect(view.sd_imageProgress.fractionCompleted).equal(1.0);
-            expect([view.sd_imageProgress.userInfo[NSStringFromSelector(_cmd)] boolValue]).equal(YES);
-            [expectation fulfill];
-        }];
-    }];
-    [self waitForExpectationsWithTimeout:kAsyncTestTimeout handler:^(NSError * _Nullable error) {
-        [view.sd_imageProgress removeObserver:self forKeyPath:NSStringFromSelector(@selector(fractionCompleted)) context:SDCategoriesTestsContext];
-    }];
+- (NSString *)testJPEGPath {
+    NSBundle *testBundle = [NSBundle bundleForClass:[self class]];
+    return [testBundle pathForResource:@"TestImage" ofType:@"jpg"];
 }
 
-- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
-{
-    if (context == SDCategoriesTestsContext) {
-        if ([keyPath isEqualToString:NSStringFromSelector(@selector(fractionCompleted))]) {
-            NSProgress *progress = object;
-            NSNumber *completedValue = change[NSKeyValueChangeNewKey];
-            expect(progress.fractionCompleted).equal(completedValue.doubleValue);
-            // mark that KVO is called
-            [progress setUserInfoObject:@(YES) forKey:NSStringFromSelector(@selector(testUIViewImageProgressKVOWork))];
-        }
-    } else {
-        [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
-    }
+- (NSString *)testGIFPath {
+    NSBundle *testBundle = [NSBundle bundleForClass:[self class]];
+    return [testBundle pathForResource:@"TestImage" ofType:@"gif"];
 }
 
 @end
diff --git a/Tests/Tests/SDImageCacheTests.m b/Tests/Tests/SDImageCacheTests.m
index 0cfb17a05..5ba6e6483 100644
--- a/Tests/Tests/SDImageCacheTests.m
+++ b/Tests/Tests/SDImageCacheTests.m
@@ -7,13 +7,21 @@
  */
 
 #import "SDTestCase.h"
-#import <SDWebImage/SDImageCache.h>
-#import <SDWebImage/SDWebImageCodersManager.h>
-#import "SDWebImageTestDecoder.h"
+#import "SDWebImageTestCoder.h"
+#import "SDMockFileManager.h"
+#import "SDWebImageTestCache.h"
 
-NSString *kImageTestKey = @"TestImageKey.jpg";
+static NSString *kTestImageKeyJPEG = @"TestImageKey.jpg";
+static NSString *kTestImageKeyPNG = @"TestImageKey.png";
+
+@interface SDCallbackQueue ()
+
+@property (nonatomic, strong, nonnull) dispatch_queue_t queue;
+
+@end
+
+@interface SDImageCacheTests : SDTestCase <NSFileManagerDelegate>
 
-@interface SDImageCacheTests : SDTestCase
 @end
 
 @implementation SDImageCacheTests
@@ -34,20 +42,21 @@ - (void)test03ImageCacheCanBeInstantiated {
 - (void)test04ClearDiskCache{
     XCTestExpectation *expectation = [self expectationWithDescription:@"Clear disk cache"];
     
-    [[SDImageCache sharedImageCache] storeImage:[self imageForTesting] forKey:kImageTestKey completion:nil];
-    [[SDImageCache sharedImageCache] clearDiskOnCompletion:^{
-        expect([[SDImageCache sharedImageCache] imageFromMemoryCacheForKey:kImageTestKey]).to.equal([self imageForTesting]);
-        [[SDImageCache sharedImageCache] diskImageExistsWithKey:kImageTestKey completion:^(BOOL isInCache) {
-            if (!isInCache) {
-                [[SDImageCache sharedImageCache] calculateSizeWithCompletionBlock:^(NSUInteger fileCount, NSUInteger totalSize) {
-                    expect(fileCount).to.equal(0);
-                    [[SDImageCache sharedImageCache] removeImageForKey:kImageTestKey withCompletion:^{
-                        [expectation fulfill];
+    [[SDImageCache sharedImageCache] storeImage:[self testJPEGImage] forKey:kTestImageKeyJPEG completion:^{
+        [[SDImageCache sharedImageCache] clearDiskOnCompletion:^{
+            expect([[SDImageCache sharedImageCache] imageFromMemoryCacheForKey:kTestImageKeyJPEG]).to.equal([self testJPEGImage]);
+            [[SDImageCache sharedImageCache] diskImageExistsWithKey:kTestImageKeyJPEG completion:^(BOOL isInCache) {
+                if (!isInCache) {
+                    [[SDImageCache sharedImageCache] calculateSizeWithCompletionBlock:^(NSUInteger fileCount, NSUInteger totalSize) {
+                        expect(fileCount).to.equal(0);
+                        [[SDImageCache sharedImageCache] removeImageForKey:kTestImageKeyJPEG withCompletion:^{
+                            [expectation fulfill];
+                        }];
                     }];
-                }];
-            } else {
-                XCTFail(@"Image should not be in cache");
-            }
+                } else {
+                    XCTFail(@"Image should not be in cache");
+                }
+            }];
         }];
     }];
     [self waitForExpectationsWithCommonTimeout];
@@ -56,12 +65,12 @@ - (void)test04ClearDiskCache{
 - (void)test05ClearMemoryCache{
     XCTestExpectation *expectation = [self expectationWithDescription:@"Clear memory cache"];
     
-    [[SDImageCache sharedImageCache] storeImage:[self imageForTesting] forKey:kImageTestKey completion:^{
+    [[SDImageCache sharedImageCache] storeImage:[self testJPEGImage] forKey:kTestImageKeyJPEG completion:^{
         [[SDImageCache sharedImageCache] clearMemory];
-        expect([[SDImageCache sharedImageCache] imageFromMemoryCacheForKey:kImageTestKey]).to.beNil;
-        [[SDImageCache sharedImageCache] diskImageExistsWithKey:kImageTestKey completion:^(BOOL isInCache) {
+        expect([[SDImageCache sharedImageCache] imageFromMemoryCacheForKey:kTestImageKeyJPEG]).to.beNil;
+        [[SDImageCache sharedImageCache] diskImageExistsWithKey:kTestImageKeyJPEG completion:^(BOOL isInCache) {
             if (isInCache) {
-                [[SDImageCache sharedImageCache] removeImageForKey:kImageTestKey withCompletion:^{
+                [[SDImageCache sharedImageCache] removeImageForKey:kTestImageKeyJPEG withCompletion:^{
                     [expectation fulfill];
                 }];
             } else {
@@ -76,18 +85,23 @@ - (void)test05ClearMemoryCache{
 - (void)test06InsertionOfImage {
     XCTestExpectation *expectation = [self expectationWithDescription:@"storeImage forKey"];
     
-    UIImage *image = [self imageForTesting];
-    [[SDImageCache sharedImageCache] storeImage:image forKey:kImageTestKey completion:nil];
-    expect([[SDImageCache sharedImageCache] imageFromMemoryCacheForKey:kImageTestKey]).to.equal(image);
-    [[SDImageCache sharedImageCache] diskImageExistsWithKey:kImageTestKey completion:^(BOOL isInCache) {
-        if (isInCache) {
-            [[SDImageCache sharedImageCache] removeImageForKey:kImageTestKey withCompletion:^{
-                [expectation fulfill];
-            }];
-        } else {
-            XCTFail(@"Image should be in cache");
-        }
+    UIImage *image = [self testJPEGImage];
+    [[SDImageCache sharedImageCache] removeImageFromDiskForKey:kTestImageKeyJPEG];
+    [[SDImageCache sharedImageCache] removeImageFromMemoryForKey:kTestImageKeyJPEG];
+    [[SDImageCache sharedImageCache] storeImage:image forKey:kTestImageKeyJPEG completion:^{
+        // Disk cache store in async
+        [[SDImageCache sharedImageCache] diskImageExistsWithKey:kTestImageKeyJPEG completion:^(BOOL isInCache) {
+            if (isInCache) {
+                [[SDImageCache sharedImageCache] removeImageForKey:kTestImageKeyJPEG withCompletion:^{
+                    [expectation fulfill];
+                }];
+            } else {
+                XCTFail(@"Image should be in cache");
+            }
+        }];
     }];
+    // Memory cache store in sync
+    expect([[SDImageCache sharedImageCache] imageFromMemoryCacheForKey:kTestImageKeyJPEG]).to.equal(image);
     [self waitForExpectationsWithCommonTimeout];
 }
 
@@ -95,119 +109,175 @@ - (void)test06InsertionOfImage {
 - (void)test07InsertionOfImageForcingDiskStorage {
     XCTestExpectation *expectation = [self expectationWithDescription:@"storeImage forKey toDisk=YES"];
     
-    UIImage *image = [self imageForTesting];
-    [[SDImageCache sharedImageCache] storeImage:image forKey:kImageTestKey toDisk:YES completion:nil];
-    expect([[SDImageCache sharedImageCache] imageFromMemoryCacheForKey:kImageTestKey]).to.equal(image);
-    [[SDImageCache sharedImageCache] diskImageExistsWithKey:kImageTestKey completion:^(BOOL isInCache) {
-        if (isInCache) {
-            [[SDImageCache sharedImageCache] removeImageForKey:kImageTestKey withCompletion:^{
-                [expectation fulfill];
-            }];
-        } else {
-            XCTFail(@"Image should be in cache");
-        }
+    UIImage *image = [self testJPEGImage];
+    [[SDImageCache sharedImageCache] storeImage:image forKey:kTestImageKeyJPEG toDisk:YES completion:^{
+        // Disk cache store in async
+        [[SDImageCache sharedImageCache] diskImageExistsWithKey:kTestImageKeyJPEG completion:^(BOOL isInCache) {
+            if (isInCache) {
+                [[SDImageCache sharedImageCache] removeImageForKey:kTestImageKeyJPEG withCompletion:^{
+                    [expectation fulfill];
+                }];
+            } else {
+                XCTFail(@"Image should be in cache");
+            }
+        }];
     }];
+    // Memory cache store in sync
+    expect([[SDImageCache sharedImageCache] imageFromMemoryCacheForKey:kTestImageKeyJPEG]).to.equal(image);
     [self waitForExpectationsWithCommonTimeout];
 }
 
 // Testing storeImage:forKey:toDisk:NO
 - (void)test08InsertionOfImageOnlyInMemory {
     XCTestExpectation *expectation = [self expectationWithDescription:@"storeImage forKey toDisk=NO"];
-    UIImage *image = [self imageForTesting];
-    [[SDImageCache sharedImageCache] storeImage:image forKey:kImageTestKey toDisk:NO completion:nil];
-    
-    expect([[SDImageCache sharedImageCache] imageFromMemoryCacheForKey:kImageTestKey]).to.equal([self imageForTesting]);
-    [[SDImageCache sharedImageCache] diskImageExistsWithKey:kImageTestKey completion:^(BOOL isInCache) {
-        if (!isInCache) {
-            [expectation fulfill];
-        } else {
-            XCTFail(@"Image should not be in cache");
-        }
+    UIImage *image = [self testJPEGImage];
+    [[SDImageCache sharedImageCache] removeImageFromDiskForKey:kTestImageKeyJPEG];
+    [[SDImageCache sharedImageCache] removeImageFromMemoryForKey:kTestImageKeyJPEG];
+    [[SDImageCache sharedImageCache] storeImage:image forKey:kTestImageKeyJPEG toDisk:NO completion:^{
+        // Disk cache store in async
+        [[SDImageCache sharedImageCache] diskImageExistsWithKey:kTestImageKeyJPEG completion:^(BOOL isInCache) {
+            if (!isInCache) {
+                [expectation fulfill];
+            } else {
+                XCTFail(@"Image should not be in cache");
+            }
+        }];
     }];
+    // Memory cache store in sync
+    expect([[SDImageCache sharedImageCache] imageFromMemoryCacheForKey:kTestImageKeyJPEG]).to.equal([self testJPEGImage]);
+    [[SDImageCache sharedImageCache] storeImageToMemory:image forKey:kTestImageKeyJPEG];
     [[SDImageCache sharedImageCache] clearMemory];
-    expect([[SDImageCache sharedImageCache] imageFromMemoryCacheForKey:kImageTestKey]).to.beNil();
+    expect([[SDImageCache sharedImageCache] imageFromMemoryCacheForKey:kTestImageKeyJPEG]).to.beNil();
     [self waitForExpectationsWithCommonTimeout];
 }
 
 - (void)test09RetrieveImageThroughNSOperation {
     XCTestExpectation *expectation = [self expectationWithDescription:@"queryCacheOperationForKey"];
-    UIImage *imageForTesting = [self imageForTesting];
-    [[SDImageCache sharedImageCache] storeImage:imageForTesting forKey:kImageTestKey completion:nil];
-    NSOperation *operation = [[SDImageCache sharedImageCache] queryCacheOperationForKey:kImageTestKey done:^(UIImage *image, NSData *data, SDImageCacheType cacheType) {
-        expect(image).to.equal(imageForTesting);
-        [[SDImageCache sharedImageCache] removeImageForKey:kImageTestKey withCompletion:^{
-            [expectation fulfill];
+    UIImage *imageForTesting = [self testJPEGImage];
+    [[SDImageCache sharedImageCache] storeImage:imageForTesting forKey:kTestImageKeyJPEG completion:^{
+        id<SDWebImageOperation> operation = [[SDImageCache sharedImageCache] queryCacheOperationForKey:kTestImageKeyJPEG done:^(UIImage *image, NSData *data, SDImageCacheType cacheType) {
+            expect(image).to.equal(imageForTesting);
+            [[SDImageCache sharedImageCache] removeImageForKey:kTestImageKeyJPEG withCompletion:^{
+                [expectation fulfill];
+            }];
         }];
+        expect(operation).toNot.beNil;
     }];
-    expect(operation).toNot.beNil;
-    [operation start];
     [self waitForExpectationsWithCommonTimeout];
 }
 
 - (void)test10RemoveImageForKeyWithCompletion {
     XCTestExpectation *expectation = [self expectationWithDescription:@"removeImageForKey"];
-    [[SDImageCache sharedImageCache] storeImage:[self imageForTesting] forKey:kImageTestKey completion:nil];
-    [[SDImageCache sharedImageCache] removeImageForKey:kImageTestKey withCompletion:^{
-        expect([[SDImageCache sharedImageCache] imageFromDiskCacheForKey:kImageTestKey]).to.beNil;
-        expect([[SDImageCache sharedImageCache] imageFromMemoryCacheForKey:kImageTestKey]).to.beNil;
-        [expectation fulfill];
+    [[SDImageCache sharedImageCache] storeImage:[self testJPEGImage] forKey:kTestImageKeyJPEG completion:^{
+        [[SDImageCache sharedImageCache] removeImageForKey:kTestImageKeyJPEG withCompletion:^{
+            expect([[SDImageCache sharedImageCache] imageFromDiskCacheForKey:kTestImageKeyJPEG]).to.beNil;
+            expect([[SDImageCache sharedImageCache] imageFromMemoryCacheForKey:kTestImageKeyJPEG]).to.beNil;
+            [expectation fulfill];
+        }];
     }];
     [self waitForExpectationsWithCommonTimeout];
 }
 
 - (void)test11RemoveImageforKeyNotFromDiskWithCompletion{
     XCTestExpectation *expectation = [self expectationWithDescription:@"removeImageForKey fromDisk:NO"];
-    [[SDImageCache sharedImageCache] storeImage:[self imageForTesting] forKey:kImageTestKey completion:nil];
-    [[SDImageCache sharedImageCache] removeImageForKey:kImageTestKey fromDisk:NO withCompletion:^{
-        expect([[SDImageCache sharedImageCache] imageFromDiskCacheForKey:kImageTestKey]).toNot.beNil;
-        expect([[SDImageCache sharedImageCache] imageFromMemoryCacheForKey:kImageTestKey]).to.beNil;
-        [expectation fulfill];
+    [[SDImageCache sharedImageCache] storeImage:[self testJPEGImage] forKey:kTestImageKeyJPEG completion:^{
+        [[SDImageCache sharedImageCache] removeImageForKey:kTestImageKeyJPEG fromDisk:NO withCompletion:^{
+            expect([[SDImageCache sharedImageCache] imageFromDiskCacheForKey:kTestImageKeyJPEG]).toNot.beNil;
+            expect([[SDImageCache sharedImageCache] imageFromMemoryCacheForKey:kTestImageKeyJPEG]).to.beNil;
+            [expectation fulfill];
+        }];
     }];
     [self waitForExpectationsWithCommonTimeout];
 }
 
 - (void)test12RemoveImageforKeyFromDiskWithCompletion{
     XCTestExpectation *expectation = [self expectationWithDescription:@"removeImageForKey fromDisk:YES"];
-    [[SDImageCache sharedImageCache] storeImage:[self imageForTesting] forKey:kImageTestKey completion:nil];
-    [[SDImageCache sharedImageCache] removeImageForKey:kImageTestKey fromDisk:YES withCompletion:^{
-        expect([[SDImageCache sharedImageCache] imageFromDiskCacheForKey:kImageTestKey]).to.beNil;
-        expect([[SDImageCache sharedImageCache] imageFromMemoryCacheForKey:kImageTestKey]).to.beNil;
-        [expectation fulfill];
+    [[SDImageCache sharedImageCache] storeImage:[self testJPEGImage] forKey:kTestImageKeyJPEG completion:^{
+        [[SDImageCache sharedImageCache] removeImageForKey:kTestImageKeyJPEG fromDisk:YES withCompletion:^{
+            expect([[SDImageCache sharedImageCache] imageFromDiskCacheForKey:kTestImageKeyJPEG]).to.beNil;
+            expect([[SDImageCache sharedImageCache] imageFromMemoryCacheForKey:kTestImageKeyJPEG]).to.beNil;
+            [expectation fulfill];
+        }];
     }];
     [self waitForExpectationsWithCommonTimeout];
 }
 
+- (void)test13DeleteOldFiles {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"deleteOldFiles"];
+    [SDImageCache sharedImageCache].config.maxDiskAge = 1; // 1 second to mark all as out-dated
+    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
+        [[SDImageCache sharedImageCache] deleteOldFilesWithCompletionBlock:^{
+            expect(SDImageCache.sharedImageCache.totalDiskCount).equal(0);
+            [expectation fulfill];
+        }];
+    });
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test14QueryCacheFirstFrameOnlyHitMemoryCache {
+    NSString *key = kTestGIFURL;
+    UIImage *animatedImage = [self testGIFImage];
+    [[SDImageCache sharedImageCache] storeImageToMemory:animatedImage forKey:key];
+    [[SDImageCache sharedImageCache] queryCacheOperationForKey:key done:^(UIImage * _Nullable image, NSData * _Nullable data, SDImageCacheType cacheType) {
+        expect(cacheType).equal(SDImageCacheTypeMemory);
+        expect(image.sd_isAnimated).beTruthy();
+        expect(image == animatedImage).beTruthy();
+    }];
+    [[SDImageCache sharedImageCache] queryCacheOperationForKey:key options:SDImageCacheDecodeFirstFrameOnly done:^(UIImage * _Nullable image, NSData * _Nullable data, SDImageCacheType cacheType) {
+        expect(cacheType).equal(SDImageCacheTypeMemory);
+        expect(image.sd_isAnimated).beFalsy();
+        expect(image == animatedImage).beFalsy();
+    }];
+    [[SDImageCache sharedImageCache] removeImageFromMemoryForKey:kTestGIFURL];
+}
+
+- (void)test15CancelQueryShouldCallbackOnceInSync {
+    NSString *key = @"test15CancelQueryShouldCallbackOnceInSync";
+    [SDImageCache.sharedImageCache removeImageFromMemoryForKey:key];
+    [SDImageCache.sharedImageCache removeImageFromDiskForKey:key];
+    __block BOOL callced = NO;
+    SDImageCacheToken *token = [SDImageCache.sharedImageCache queryCacheOperationForKey:key done:^(UIImage * _Nullable image, NSData * _Nullable data, SDImageCacheType cacheType) {
+        callced = YES;
+    }];
+    expect(callced).beFalsy();
+    [token cancel]; // sync
+    expect(callced).beTruthy();
+    if (callced == NO) {
+        XCTFail("Callback called not in sync but async");
+    }
+}
+
 - (void)test20InitialCacheSize{
-    expect([[SDImageCache sharedImageCache] getSize]).to.equal(0);
+    expect([[SDImageCache sharedImageCache] totalDiskSize]).to.equal(0);
 }
 
 - (void)test21InitialDiskCount{
     XCTestExpectation *expectation = [self expectationWithDescription:@"getDiskCount"];
-    [[SDImageCache sharedImageCache] storeImage:[self imageForTesting] forKey:kImageTestKey completion:^{
-        expect([[SDImageCache sharedImageCache] getDiskCount]).to.equal(1);
-        [[SDImageCache sharedImageCache] removeImageForKey:kImageTestKey withCompletion:^{
+    [[SDImageCache sharedImageCache] storeImage:[self testJPEGImage] forKey:kTestImageKeyJPEG completion:^{
+        expect([[SDImageCache sharedImageCache] totalDiskCount]).to.equal(1);
+        [[SDImageCache sharedImageCache] removeImageForKey:kTestImageKeyJPEG withCompletion:^{
             [expectation fulfill];
         }];
     }];
     [self waitForExpectationsWithCommonTimeout];
 }
 
-- (void)test31DefaultCachePathForAnyKey{
-    NSString *path = [[SDImageCache sharedImageCache] defaultCachePathForKey:kImageTestKey];
+- (void)test31CachePathForAnyKey{
+    NSString *path = [[SDImageCache sharedImageCache] cachePathForKey:kTestImageKeyJPEG];
     expect(path).toNot.beNil;
 }
 
-- (void)test32CachePathForNonExistingKey{
-    NSString *path = [[SDImageCache sharedImageCache] cachePathForKey:kImageTestKey inPath:[[SDImageCache sharedImageCache] defaultCachePathForKey:kImageTestKey]];
+- (void)test32CachePathForNilKey{
+    NSString *path = [[SDImageCache sharedImageCache] cachePathForKey:nil];
     expect(path).to.beNil;
 }
 
 - (void)test33CachePathForExistingKey{
     XCTestExpectation *expectation = [self expectationWithDescription:@"cachePathForKey inPath"];
-    [[SDImageCache sharedImageCache] storeImage:[self imageForTesting] forKey:kImageTestKey completion:^{
-        NSString *path = [[SDImageCache sharedImageCache] cachePathForKey:kImageTestKey inPath:[[SDImageCache sharedImageCache] defaultCachePathForKey:kImageTestKey]];
+    [[SDImageCache sharedImageCache] storeImage:[self testJPEGImage] forKey:kTestImageKeyJPEG completion:^{
+        NSString *path = [[SDImageCache sharedImageCache] cachePathForKey:kTestImageKeyJPEG];
         expect(path).notTo.beNil;
-        [[SDImageCache sharedImageCache] removeImageForKey:kImageTestKey withCompletion:^{
+        [[SDImageCache sharedImageCache] removeImageForKey:kTestImageKeyJPEG withCompletion:^{
             [expectation fulfill];
         }];
     }];
@@ -215,14 +285,28 @@ - (void)test33CachePathForExistingKey{
 }
 
 - (void)test34CachePathForSimpleKeyWithExtension {
-    NSString *cachePath = [[SDImageCache sharedImageCache] cachePathForKey:kTestJpegURL inPath:@""];
+    NSString *cachePath = [[SDImageCache sharedImageCache] cachePathForKey:kTestJPEGURL];
     expect(cachePath).toNot.beNil();
     expect([cachePath pathExtension]).to.equal(@"jpg");
 }
 
 - (void)test35CachePathForKeyWithDotButNoExtension {
     NSString *urlString = @"https://maps.googleapis.com/maps/api/staticmap?center=48.8566,2.3522&format=png&maptype=roadmap&scale=2&size=375x200&zoom=15";
-    NSString *cachePath = [[SDImageCache sharedImageCache] cachePathForKey:urlString inPath:@""];
+    NSString *cachePath = [[SDImageCache sharedImageCache] cachePathForKey:urlString];
+    expect(cachePath).toNot.beNil();
+    expect([cachePath pathExtension]).to.equal(@"");
+}
+
+- (void)test36CachePathForKeyWithURLQueryParams {
+    NSString *urlString = @"https://imggen.alicdn.com/3b11cea896a9438329d85abfb07b30a8.jpg?aid=tanx&tid=1166&m=%7B%22img_url%22%3A%22https%3A%2F%2Fgma.alicdn.com%2Fbao%2Fuploaded%2Fi4%2F1695306010722305097%2FTB2S2KjkHtlpuFjSspoXXbcDpXa_%21%210-saturn_solar.jpg_sum.jpg%22%2C%22title%22%3A%22%E6%A4%8D%E7%89%A9%E8%94%B7%E8%96%87%E7%8E%AB%E7%91%B0%E8%8A%B1%22%2C%22promot_name%22%3A%22%22%2C%22itemid%22%3A%22546038044448%22%7D&e=cb88dab197bfaa19804f6ec796ca906dab536b88fe6d4475795c7ee661a7ede1&size=640x246";
+    NSString *cachePath = [[SDImageCache sharedImageCache] cachePathForKey:urlString];
+    expect(cachePath).toNot.beNil();
+    expect([cachePath pathExtension]).to.equal(@"jpg");
+}
+
+- (void)test37CachePathForKeyWithTooLongExtension {
+    NSString *urlString = @"https://imggen.alicdn.com/3b11cea896a9438329d85abfb07b30a8.jpgasaaaaaaaaaaaaaaaaaaaajjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjaaaaaaaaaaaaaaaaajjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj";
+    NSString *cachePath = [[SDImageCache sharedImageCache] cachePathForKey:urlString];
     expect(cachePath).toNot.beNil();
     expect([cachePath pathExtension]).to.equal(@"");
 }
@@ -230,24 +314,25 @@ - (void)test35CachePathForKeyWithDotButNoExtension {
 - (void)test40InsertionOfImageData {
     XCTestExpectation *expectation = [self expectationWithDescription:@"Insertion of image data works"];
     
-    UIImage *image = [UIImage imageWithContentsOfFile:[self testImagePath]];
-    NSData *imageData = UIImageJPEGRepresentation(image, 1.0);
-    [[SDImageCache sharedImageCache] storeImageDataToDisk:imageData forKey:kImageTestKey];
+    UIImage *image = [[UIImage alloc] initWithContentsOfFile:[self testJPEGPath]];
+    NSData *imageData = [image sd_imageDataAsFormat:SDImageFormatJPEG];
+    [[SDImageCache sharedImageCache] storeImageDataToDisk:imageData forKey:kTestImageKeyJPEG];
     
-    UIImage *storedImageFromMemory = [[SDImageCache sharedImageCache] imageFromMemoryCacheForKey:kImageTestKey];
+    expect([[SDImageCache sharedImageCache] diskImageDataExistsWithKey:kTestImageKeyJPEG]).beTruthy();
+    UIImage *storedImageFromMemory = [[SDImageCache sharedImageCache] imageFromMemoryCacheForKey:kTestImageKeyJPEG];
     expect(storedImageFromMemory).to.equal(nil);
     
-    NSString *cachePath = [[SDImageCache sharedImageCache] defaultCachePathForKey:kImageTestKey];
-    UIImage *cachedImage = [UIImage imageWithContentsOfFile:cachePath];
-    NSData *storedImageData = UIImageJPEGRepresentation(cachedImage, 1.0);
+    NSString *cachePath = [[SDImageCache sharedImageCache] cachePathForKey:kTestImageKeyJPEG];
+    UIImage *cachedImage = [[UIImage alloc] initWithContentsOfFile:cachePath];
+    NSData *storedImageData = [cachedImage sd_imageDataAsFormat:SDImageFormatJPEG];
     expect(storedImageData.length).to.beGreaterThan(0);
     expect(cachedImage.size).to.equal(image.size);
     // can't directly compare image and cachedImage because apparently there are some slight differences, even though the image is the same
     
-    [[SDImageCache sharedImageCache] diskImageExistsWithKey:kImageTestKey completion:^(BOOL isInCache) {
+    [[SDImageCache sharedImageCache] diskImageExistsWithKey:kTestImageKeyJPEG completion:^(BOOL isInCache) {
         expect(isInCache).to.equal(YES);
         
-        [[SDImageCache sharedImageCache] removeImageForKey:kImageTestKey withCompletion:^{
+        [[SDImageCache sharedImageCache] removeImageForKey:kTestImageKeyJPEG withCompletion:^{
             [expectation fulfill];
         }];
     }];
@@ -258,10 +343,10 @@ - (void)test40InsertionOfImageData {
 - (void)test41ThatCustomDecoderWorksForImageCache {
     XCTestExpectation *expectation = [self expectationWithDescription:@"Custom decoder for SDImageCache not works"];
     SDImageCache *cache = [[SDImageCache alloc] initWithNamespace:@"TestDecode"];
-    SDWebImageTestDecoder *testDecoder = [[SDWebImageTestDecoder alloc] init];
-    [[SDWebImageCodersManager sharedInstance] addCoder:testDecoder];
+    SDWebImageTestCoder *testDecoder = [[SDWebImageTestCoder alloc] init];
+    [[SDImageCodersManager sharedManager] addCoder:testDecoder];
     NSString * testImagePath = [[NSBundle bundleForClass:[self class]] pathForResource:@"TestImage" ofType:@"png"];
-    UIImage *image = [UIImage imageWithContentsOfFile:testImagePath];
+    UIImage *image = [[UIImage alloc] initWithContentsOfFile:testImagePath];
     NSString *key = @"TestPNGImageEncodedToDataAndRetrieveToJPEG";
     
     [cache storeImage:image imageData:nil forKey:key toDisk:YES completion:^{
@@ -284,39 +369,669 @@ - (void)test41ThatCustomDecoderWorksForImageCache {
         
         // Decoded result is JPEG
         NSString * decodedImagePath = [[NSBundle bundleForClass:[self class]] pathForResource:@"TestImage" ofType:@"jpg"];
-        UIImage *testJPEGImage = [UIImage imageWithContentsOfFile:decodedImagePath];
+        UIImage *testJPEGImage = [[UIImage alloc] initWithContentsOfFile:decodedImagePath];
         
-        NSData *data1 = UIImagePNGRepresentation(testJPEGImage);
-        NSData *data2 = UIImagePNGRepresentation(diskCacheImage);
+        NSData *data1 = [testJPEGImage sd_imageDataAsFormat:SDImageFormatPNG];
+        NSData *data2 = [diskCacheImage sd_imageDataAsFormat:SDImageFormatPNG];
         
         if (![data1 isEqualToData:data2]) {
             XCTFail(@"Custom decoder not work for SDImageCache, check -[SDWebImageTestDecoder decodedImageWithData:]");
         }
         
-        [[SDWebImageCodersManager sharedInstance] removeCoder:testDecoder];
+        [[SDImageCodersManager sharedManager] removeCoder:testDecoder];
         
-        [[SDImageCache sharedImageCache] removeImageForKey:key withCompletion:^{
+        [cache removeImageFromMemoryForKey:key];
+        [cache removeImageFromDiskForKey:key];
+        [expectation fulfill];
+    }];
+    
+    [self waitForExpectationsWithTimeout:10 handler:nil];
+}
+
+- (void)test41StoreImageDataToDiskWithCustomFileManager {
+    NSData *imageData = [NSData dataWithContentsOfFile:[self testJPEGPath]];
+    NSError *targetError = [NSError errorWithDomain:NSCocoaErrorDomain code:NSFileWriteNoPermissionError userInfo:nil];
+    
+    SDMockFileManager *fileManager = [[SDMockFileManager alloc] init];
+    fileManager.mockSelectors = @{NSStringFromSelector(@selector(createDirectoryAtPath:withIntermediateDirectories:attributes:error:)) : targetError};
+    expect(fileManager.lastError).to.beNil();
+    
+    SDImageCacheConfig *config = [SDImageCacheConfig new];
+    config.fileManager = fileManager;
+    // This disk cache path creation will be mocked with error.
+    SDImageCache *cache = [[SDImageCache alloc] initWithNamespace:@"test" diskCacheDirectory:@"/" config:config];
+    [cache storeImageDataToDisk:imageData
+                         forKey:kTestImageKeyJPEG];
+    expect(fileManager.lastError).equal(targetError);
+}
+
+- (void)test41MatchAnimatedImageClassWorks {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"MatchAnimatedImageClass option should work"];
+    UIImage *image = [[UIImage alloc] initWithContentsOfFile:self.testGIFPath];
+    
+    NSString *kAnimatedImageKey = @"kAnimatedImageKey";
+    
+    // Store UIImage into cache
+    [[SDImageCache sharedImageCache] storeImageToMemory:image forKey:kAnimatedImageKey];
+    
+    // `MatchAnimatedImageClass` will cause query failed because class does not match
+    [SDImageCache.sharedImageCache queryCacheOperationForKey:kAnimatedImageKey options:SDImageCacheMatchAnimatedImageClass context:@{SDWebImageContextAnimatedImageClass : SDAnimatedImage.class} done:^(UIImage * _Nullable image1, NSData * _Nullable data1, SDImageCacheType cacheType1) {
+        expect(image1).beNil();
+        // This should query success with UIImage
+        [SDImageCache.sharedImageCache queryCacheOperationForKey:kAnimatedImageKey options:0 context:@{SDWebImageContextAnimatedImageClass : SDAnimatedImage.class} done:^(UIImage * _Nullable image2, NSData * _Nullable data2, SDImageCacheType cacheType2) {
+            expect(image2).notTo.beNil();
+            expect(image2).equal(image);
+            
             [expectation fulfill];
         }];
     }];
     
+    // Test sync version API `imageFromCacheForKey` as well
+    expect([SDImageCache.sharedImageCache imageFromCacheForKey:kAnimatedImageKey options:SDImageCacheMatchAnimatedImageClass context:@{SDWebImageContextAnimatedImageClass : SDAnimatedImage.class}]).beNil();
+    expect([SDImageCache.sharedImageCache imageFromCacheForKey:kAnimatedImageKey options:0 context:@{SDWebImageContextAnimatedImageClass : SDAnimatedImage.class}]).notTo.beNil();
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test42StoreCacheWithImageAndFormatWithoutImageData {
+    XCTestExpectation *expectation1 = [self expectationWithDescription:@"StoreImage UIImage without sd_imageFormat should use PNG for alpha channel"];
+    XCTestExpectation *expectation2 = [self expectationWithDescription:@"StoreImage UIImage without sd_imageFormat should use JPEG for non-alpha channel"];
+    XCTestExpectation *expectation3 = [self expectationWithDescription:@"StoreImage UIImage/UIAnimatedImage with sd_imageFormat should use that format"];
+    XCTestExpectation *expectation4 = [self expectationWithDescription:@"StoreImage SDAnimatedImage should use animatedImageData"];
+    XCTestExpectation *expectation5 = [self expectationWithDescription:@"StoreImage UIAnimatedImage without sd_imageFormat should use GIF"];
+    
+    NSString *kAnimatedImageKey1 = @"kAnimatedImageKey1";
+    NSString *kAnimatedImageKey2 = @"kAnimatedImageKey2";
+    NSString *kAnimatedImageKey3 = @"kAnimatedImageKey3";
+    NSString *kAnimatedImageKey4 = @"kAnimatedImageKey4";
+    NSString *kAnimatedImageKey5 = @"kAnimatedImageKey5";
+    
+    // Case 1: UIImage without `sd_imageFormat` should use PNG for alpha channel
+    NSData *pngData = [NSData dataWithContentsOfFile:[self testPNGPath]];
+    UIImage *pngImage = [UIImage sd_imageWithData:pngData];
+    expect(pngImage.sd_isAnimated).beFalsy();
+    expect(pngImage.sd_imageFormat).equal(SDImageFormatPNG);
+    // Remove sd_imageFormat
+    pngImage.sd_imageFormat = SDImageFormatUndefined;
+    // Check alpha channel
+    expect([SDImageCoderHelper CGImageContainsAlpha:pngImage.CGImage]).beTruthy();
+    
+    [SDImageCache.sharedImageCache storeImage:pngImage forKey:kAnimatedImageKey1 toDisk:YES completion:^{
+        UIImage *diskImage = [SDImageCache.sharedImageCache imageFromDiskCacheForKey:kAnimatedImageKey1];
+        // Should save to PNG
+        expect(diskImage.sd_isAnimated).beFalsy();
+        expect(diskImage.sd_imageFormat).equal(SDImageFormatPNG);
+        [expectation1 fulfill];
+    }];
+    
+    // Case 2: UIImage without `sd_imageFormat` should use JPEG for non-alpha channel
+    NSData *jpegData = [NSData dataWithContentsOfFile:[self testJPEGPath]];
+    UIImage *jpegImage = [UIImage sd_imageWithData:jpegData];
+    expect(jpegImage.sd_isAnimated).beFalsy();
+    expect(jpegImage.sd_imageFormat).equal(SDImageFormatJPEG);
+    expect([SDImageCoderHelper CGImageContainsAlpha:jpegImage.CGImage]).beFalsy();
+    
+    [SDImageCache.sharedImageCache storeImage:jpegImage forKey:kAnimatedImageKey2 toDisk:YES completion:^{
+        UIImage *diskImage = [SDImageCache.sharedImageCache imageFromDiskCacheForKey:kAnimatedImageKey2];
+        // Should save to JPEG
+        expect(diskImage.sd_isAnimated).beFalsy();
+        expect(diskImage.sd_imageFormat).equal(SDImageFormatJPEG);
+        [expectation2 fulfill];
+    }];
+    
+    NSData *gifData = [NSData dataWithContentsOfFile:[self testGIFPath]];
+    UIImage *gifImage = [UIImage sd_imageWithData:gifData]; // UIAnimatedImage
+    expect(gifImage.sd_isAnimated).beTruthy();
+    expect(gifImage.sd_imageFormat).equal(SDImageFormatGIF);
+    
+    // Case 3: UIImage with `sd_imageFormat` should use that format
+    [SDImageCache.sharedImageCache storeImage:gifImage forKey:kAnimatedImageKey3 toDisk:YES completion:^{
+        UIImage *diskImage = [SDImageCache.sharedImageCache imageFromDiskCacheForKey:kAnimatedImageKey3];
+        // Should save to GIF
+        expect(diskImage.sd_isAnimated).beTruthy();
+        expect(diskImage.sd_imageFormat).equal(SDImageFormatGIF);
+        [expectation3 fulfill];
+    }];
+    
+    // Case 4: SDAnimatedImage should use `animatedImageData`
+    SDAnimatedImage *animatedImage = [SDAnimatedImage imageWithData:gifData];
+    expect(animatedImage.animatedImageData).notTo.beNil();
+    [SDImageCache.sharedImageCache storeImage:animatedImage forKey:kAnimatedImageKey4 toDisk:YES completion:^{
+        NSData *data = [SDImageCache.sharedImageCache diskImageDataForKey:kAnimatedImageKey4];
+        // Should save with animatedImageData
+        expect(data).equal(animatedImage.animatedImageData);
+        [expectation4 fulfill];
+    }];
+    
+    // Case 5: UIAnimatedImage without sd_imageFormat should use GIF not APNG
+    NSData *apngData = [NSData dataWithContentsOfFile:[self testAPNGPath]];
+    UIImage *apngImage = [UIImage sd_imageWithData:apngData];
+    expect(apngImage.sd_isAnimated).beTruthy();
+    expect(apngImage.sd_imageFormat).equal(SDImageFormatPNG);
+    // Remove sd_imageFormat
+    apngImage.sd_imageFormat = SDImageFormatUndefined;
+    
+    [SDImageCache.sharedImageCache storeImage:apngImage forKey:kAnimatedImageKey5 toDisk:YES completion:^{
+        UIImage *diskImage = [SDImageCache.sharedImageCache imageFromDiskCacheForKey:kAnimatedImageKey5];
+        // Should save to GIF
+        expect(diskImage.sd_isAnimated).beTruthy();
+        if (@available(iOS 12.0, tvOS 12.0, macOS 10.14, watchOS 5.0, *)) {
+            expect(diskImage.sd_imageFormat).equal(SDImageFormatPNG);
+        } else {
+            expect(diskImage.sd_imageFormat).equal(SDImageFormatGIF);
+        }
+        [expectation5 fulfill];
+    }];
+    
     [self waitForExpectationsWithCommonTimeout];
 }
 
+- (void)test43CustomDefaultCacheDirectory {
+    NSArray<NSString *> *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
+    NSString *testDirectory = [paths.firstObject stringByAppendingPathComponent:@"CustomDefaultCacheDirectory"];
+    NSString *defaultDirectory = [paths.firstObject stringByAppendingPathComponent:@"com.hackemist.SDImageCache"];
+    NSString *namespace = @"Test";
+    
+    // Default cache path
+    expect(SDImageCache.defaultDiskCacheDirectory).equal(defaultDirectory);
+    SDImageCache *cache1 = [[SDImageCache alloc] initWithNamespace:namespace];
+    expect(cache1.diskCachePath).equal([defaultDirectory stringByAppendingPathComponent:namespace]);
+    // Custom cache path
+    SDImageCache.defaultDiskCacheDirectory = testDirectory;
+    SDImageCache *cache2 = [[SDImageCache alloc] initWithNamespace:namespace];
+    expect(cache2.diskCachePath).equal([testDirectory stringByAppendingPathComponent:namespace]);
+    // Check reset
+    SDImageCache.defaultDiskCacheDirectory = nil;
+    expect(SDImageCache.defaultDiskCacheDirectory).equal(defaultDirectory);
+}
+
+#pragma mark - SDMemoryCache & SDDiskCache
+- (void)test42CustomMemoryCache {
+    SDImageCacheConfig *config = [[SDImageCacheConfig alloc] init];
+    config.memoryCacheClass = [SDWebImageTestMemoryCache class];
+    NSString *nameSpace = @"SDWebImageTestMemoryCache";
+    SDImageCache *cache = [[SDImageCache alloc] initWithNamespace:nameSpace diskCacheDirectory:nil config:config];
+    SDWebImageTestMemoryCache *memCache = cache.memoryCache;
+    expect([memCache isKindOfClass:[SDWebImageTestMemoryCache class]]).to.beTruthy();
+}
+
+- (void)test43CustomDiskCache {
+    SDImageCacheConfig *config = [[SDImageCacheConfig alloc] init];
+    config.diskCacheClass = [SDWebImageTestDiskCache class];
+    NSString *nameSpace = @"SDWebImageTestDiskCache";
+    SDImageCache *cache = [[SDImageCache alloc] initWithNamespace:nameSpace diskCacheDirectory:nil config:config];
+    SDWebImageTestDiskCache *diskCache = cache.diskCache;
+    expect([diskCache isKindOfClass:[SDWebImageTestDiskCache class]]).to.beTruthy();
+}
+
+- (void)test44DiskCacheMigrationFromOldVersion {
+    SDImageCacheConfig *config = [[SDImageCacheConfig alloc] init];
+    NSFileManager *fileManager = [[NSFileManager alloc] init];
+    config.fileManager = fileManager;
+    
+    // Fake to store a%@.png into old path
+    NSString *newDefaultPath = [[[self userCacheDirectory] stringByAppendingPathComponent:@"com.hackemist.SDImageCache"] stringByAppendingPathComponent:@"default"];
+    NSString *oldDefaultPath = [[[self userCacheDirectory] stringByAppendingPathComponent:@"default"] stringByAppendingPathComponent:@"com.hackemist.SDWebImageCache.default"];
+    [fileManager createDirectoryAtPath:oldDefaultPath withIntermediateDirectories:YES attributes:nil error:nil];
+    
+    // Create 100 files to Migrate
+    for (NSUInteger i = 0; i < 100; i++) {
+        NSString *fileName = [NSString stringWithFormat:@"a%@.png", @(i)];
+        [fileManager createFileAtPath:[oldDefaultPath stringByAppendingPathComponent:fileName] contents:[NSData dataWithContentsOfFile:[self testPNGPath]] attributes:nil];
+    }
+    
+    // Call migration
+    SDDiskCache *diskCache = [[SDDiskCache alloc] initWithCachePath:newDefaultPath config:config];
+    [diskCache moveCacheDirectoryFromPath:oldDefaultPath toPath:newDefaultPath];
+    
+    // Expect a%@.png into new path and oldDefaultPath is deleted
+    BOOL isDirectory = NO;
+    for (NSUInteger i = 0; i < 100; i++) {
+        NSString *fileName = [NSString stringWithFormat:@"a%@.png", @(i)];
+        BOOL newFileExist = [fileManager fileExistsAtPath:[newDefaultPath stringByAppendingPathComponent:fileName] isDirectory:&isDirectory];
+        expect(newFileExist).beTruthy();
+        expect(isDirectory).beFalsy();
+    }
+    BOOL oldDefaultPathExist = [fileManager fileExistsAtPath:oldDefaultPath];
+    expect(oldDefaultPathExist).beFalsy();
+}
+
+- (void)test45DiskCacheRemoveExpiredData {
+    NSString *cachePath = [[self userCacheDirectory] stringByAppendingPathComponent:@"disk"];
+    SDImageCacheConfig *config = SDImageCacheConfig.defaultCacheConfig;
+    config.maxDiskAge = 1; // 1 second
+    config.maxDiskSize = 10; // 10 KB
+    SDDiskCache *diskCache = [[SDDiskCache alloc] initWithCachePath:cachePath config:config];
+    [diskCache removeAllData];
+    expect(diskCache.totalSize).equal(0);
+    expect(diskCache.totalCount).equal(0);
+    // 20KB -> maxDiskSize
+    NSUInteger length = 20;
+    void *bytes = malloc(length);
+    NSData *data = [NSData dataWithBytes:bytes length:length];
+    free(bytes);
+    [diskCache setData:data forKey:@"20KB"];
+    expect(diskCache.totalSize).equal(length);
+    expect(diskCache.totalCount).equal(1);
+    [diskCache removeExpiredData];
+    expect(diskCache.totalSize).equal(0);
+    expect(diskCache.totalCount).equal(0);
+    // 1KB with 5s -> maxDiskAge
+    XCTestExpectation *expectation = [self expectationWithDescription:@"SDDiskCache removeExpireData timeout"];
+    length = 1;
+    bytes = malloc(length);
+    data = [NSData dataWithBytes:bytes length:length];
+    free(bytes);
+    [diskCache setData:data forKey:@"1KB"];
+    expect(diskCache.totalSize).equal(length);
+    expect(diskCache.totalCount).equal(1);
+    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
+        [diskCache removeExpiredData];
+        expect(diskCache.totalSize).equal(0);
+        expect(diskCache.totalCount).equal(0);
+        [expectation fulfill];
+    });
+    [self waitForExpectationsWithTimeout:5 handler:nil];
+}
+
+#if SD_UIKIT
+- (void)test46MemoryCacheWeakCache {
+    SDMemoryCache *memoryCache = [[SDMemoryCache alloc] init];
+    memoryCache.config.shouldUseWeakMemoryCache = NO;
+    memoryCache.config.maxMemoryCost = 10;
+    memoryCache.config.maxMemoryCount = 5;
+    expect(memoryCache.countLimit).equal(5);
+    expect(memoryCache.totalCostLimit).equal(10);
+    // Don't use weak cache
+    NSObject *object = [NSObject new];
+    [memoryCache setObject:object forKey:@"1"];
+    [[NSNotificationCenter defaultCenter] postNotificationName:UIApplicationDidReceiveMemoryWarningNotification object:nil];
+    NSObject *cachedObject = [memoryCache objectForKey:@"1"];
+    expect(cachedObject).beNil();
+    // Use weak cache
+    memoryCache.config.shouldUseWeakMemoryCache = YES;
+    object = [NSObject new];
+    [memoryCache setObject:object forKey:@"1"];
+    [[NSNotificationCenter defaultCenter] postNotificationName:UIApplicationDidReceiveMemoryWarningNotification object:nil];
+    cachedObject = [memoryCache objectForKey:@"1"];
+    expect(object).equal(cachedObject);
+}
+#endif
+
+- (void)test47DiskCacheExtendedData {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"SDImageCache extended data read/write works"];
+    UIImage *image = [self testPNGImage];
+    NSDictionary *extendedObject = @{@"Test" : @"Object"};
+    image.sd_extendedObject = extendedObject;
+    [SDImageCache.sharedImageCache removeImageFromMemoryForKey:kTestImageKeyPNG];
+    [SDImageCache.sharedImageCache removeImageFromDiskForKey:kTestImageKeyPNG];
+    // Write extended data
+    [SDImageCache.sharedImageCache storeImage:image forKey:kTestImageKeyPNG completion:^{
+        NSData *extendedData = [SDImageCache.sharedImageCache.diskCache extendedDataForKey:kTestImageKeyPNG];
+        expect(extendedData).toNot.beNil();
+        // Read extended data
+        UIImage *newImage = [SDImageCache.sharedImageCache imageFromDiskCacheForKey:kTestImageKeyPNG];
+        id newExtendedObject = newImage.sd_extendedObject;
+        expect(extendedObject).equal(newExtendedObject);
+        // Remove extended data
+        [SDImageCache.sharedImageCache.diskCache setExtendedData:nil forKey:kTestImageKeyPNG];
+        [expectation fulfill];
+    }];
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+/*
+- (void)test48CacheUseConcurrentIOQueue {
+    XCTestExpectation *expectation1 = [self expectationWithDescription:@"SDImageCache concurrent ioQueue1"];
+    XCTestExpectation *expectation2 = [self expectationWithDescription:@"SDImageCache concurrent ioQueue2"];
+    
+    SDImageCacheConfig *config = [SDImageCacheConfig new];
+    dispatch_queue_attr_t attr = dispatch_queue_attr_make_with_qos_class(DISPATCH_QUEUE_CONCURRENT, QOS_CLASS_BACKGROUND, 0);
+    config.ioQueueAttributes = attr;
+    
+    SDImageCache *cache = [[SDImageCache alloc] initWithNamespace:@"Concurrent" diskCacheDirectory:@"/" config:config];
+    // Added test case for custom queue
+    SDCallbackQueue *globalQueue = SDCallbackQueue.globalQueue;
+    globalQueue.policy = SDCallbackPolicyDispatch;
+    [globalQueue async:^{
+        SDCallbackQueue *currentQueue = SDCallbackQueue.currentQueue;
+        SDWebImageContext *context = @{SDWebImageContextCallbackQueue : currentQueue};
+        expect(globalQueue.queue).equal(currentQueue.queue);
+        expect(NSThread.isMainThread).beFalsy();
+        [cache queryCacheOperationForKey:@"Key1" options:0 context:context done:^(UIImage * _Nullable image, NSData * _Nullable data, SDImageCacheType cacheType) {
+            SDCallbackQueue *currentQueue1 = SDCallbackQueue.currentQueue;
+            expect(globalQueue.queue).equal(currentQueue1.queue);
+            expect(NSThread.isMainThread).beFalsy();
+            [expectation1 fulfill];
+        }];
+        [cache queryCacheOperationForKey:@"Key2" options:0 context:context done:^(UIImage * _Nullable image, NSData * _Nullable data, SDImageCacheType cacheType) {
+            SDCallbackQueue *currentQueue2 = SDCallbackQueue.currentQueue;
+            expect(globalQueue.queue).equal(currentQueue2.queue);
+            expect(NSThread.isMainThread).beFalsy();
+            [expectation2 fulfill];
+        }];
+    }];
+    
+    [self waitForExpectationsWithTimeout:10 handler:^(NSError * _Nullable error) {
+        [cache clearDiskOnCompletion:nil];
+    }];
+}
+ */
+
+- (void)test49DiskCacheKeyForInvalidURL {
+    NSURL *url1 = [NSURL URLWithString:@"http://e.hiphotos.baidu.com/image/pic/item/a1ec08fa513d2697e542494057fbb2fb4316d81e.jpg00%00"];
+    expect([url1.pathExtension hasSuffix:@"\0"]).beTruthy(); // Test Foundation API behavior here
+    expect(url1).notTo.beNil();
+    NSString *key1 = [SDWebImageManager.sharedManager cacheKeyForURL:url1];
+    expect(key1).notTo.beNil();
+    NSString *path1 = [SDImageCache.sharedImageCache.diskCache cachePathForKey:key1];
+    NSString *ext1 = path1.pathExtension;
+    expect(ext1).equal(@"jpg00");
+    
+    NSURL *url2 = [NSURL URLWithString:@"https://maps.googleapis.com/maps/api/staticmap?center=48.8566,2.3522&format=png&maptype=roadmap&scale=2&size=375x200&zoom=15"];
+    expect(url2.pathExtension.length).equal(0); // Test Foundation API behavior here
+    expect(url2).notTo.beNil();
+    NSString *key2 = [SDWebImageManager.sharedManager cacheKeyForURL:url2];
+    expect(key2).notTo.beNil();
+    NSString *path2 = [SDImageCache.sharedImageCache.diskCache cachePathForKey:key2];
+    expect(path2).notTo.beNil();
+    NSString *ext2 = path2.pathExtension;
+    expect(ext2).equal(@"");
+}
+
+#pragma mark - SDImageCache & SDImageCachesManager
+- (void)test49SDImageCacheQueryOp {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"SDImageCache query op works"];
+    NSData *imageData = [[SDImageCodersManager sharedManager] encodedDataWithImage:[self testJPEGImage] format:SDImageFormatJPEG options:nil];
+    [[SDImageCache sharedImageCache] storeImageDataToDisk:imageData forKey:kTestImageKeyJPEG];
+    
+    [[SDImageCachesManager sharedManager] queryImageForKey:kTestImageKeyJPEG options:0 context:@{SDWebImageContextStoreCacheType : @(SDImageCacheTypeDisk)} cacheType:SDImageCacheTypeAll completion:^(UIImage * _Nullable image, NSData * _Nullable data, SDImageCacheType cacheType) {
+        expect(image).notTo.beNil();
+        expect([[SDImageCache sharedImageCache] imageFromMemoryCacheForKey:kTestImageKeyJPEG]).beNil();
+        [expectation fulfill];
+    }];
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test50SDImageCacheQueryOp {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"SDImageCache query op works"];
+    [[SDImageCache sharedImageCache] storeImage:[self testJPEGImage] forKey:kTestImageKeyJPEG toDisk:NO completion:nil];
+    [[SDImageCachesManager sharedManager] queryImageForKey:kTestImageKeyJPEG options:0 context:nil cacheType:SDImageCacheTypeAll completion:^(UIImage * _Nullable image, NSData * _Nullable data, SDImageCacheType cacheType) {
+        expect(image).notTo.beNil();
+        [expectation fulfill];
+    }];
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test51SDImageCacheStoreOp {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"SDImageCache store op works"];
+    [[SDImageCachesManager sharedManager] storeImage:[self testJPEGImage] imageData:nil forKey:kTestImageKeyJPEG cacheType:SDImageCacheTypeAll completion:^{
+        UIImage *image = [[SDImageCache sharedImageCache] imageFromMemoryCacheForKey:kTestImageKeyJPEG];
+        expect(image).notTo.beNil();
+        [[SDImageCache sharedImageCache] diskImageExistsWithKey:kTestImageKeyJPEG completion:^(BOOL isInCache) {
+            expect(isInCache).to.beTruthy();
+            [expectation fulfill];
+        }];
+    }];
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test52SDImageCacheRemoveOp {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"SDImageCache remove op works"];
+    [[SDImageCachesManager sharedManager] removeImageForKey:kTestImageKeyJPEG cacheType:SDImageCacheTypeDisk completion:^{
+        UIImage *memoryImage = [[SDImageCache sharedImageCache] imageFromMemoryCacheForKey:kTestImageKeyJPEG];
+        expect(memoryImage).notTo.beNil();
+        [[SDImageCache sharedImageCache] diskImageExistsWithKey:kTestImageKeyJPEG completion:^(BOOL isInCache) {
+            expect(isInCache).to.beFalsy();
+            [expectation fulfill];
+        }];
+    }];
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test53SDImageCacheContainsOp {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"SDImageCache contains op works"];
+    [[SDImageCachesManager sharedManager] containsImageForKey:kTestImageKeyJPEG cacheType:SDImageCacheTypeAll completion:^(SDImageCacheType containsCacheType) {
+        expect(containsCacheType).equal(SDImageCacheTypeMemory);
+        [expectation fulfill];
+    }];
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test54SDImageCacheClearOp {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"SDImageCache clear op works"];
+    [[SDImageCachesManager sharedManager] clearWithCacheType:SDImageCacheTypeAll completion:^{
+        UIImage *memoryImage = [[SDImageCache sharedImageCache] imageFromMemoryCacheForKey:kTestImageKeyJPEG];
+        expect(memoryImage).to.beNil();
+        [[SDImageCache sharedImageCache] diskImageExistsWithKey:kTestImageKeyJPEG completion:^(BOOL isInCache) {
+            expect(isInCache).to.beFalsy();
+            [expectation fulfill];
+        }];
+    }];
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test55SDImageCachesManagerOperationPolicySimple {
+    SDImageCachesManager *cachesManager = [[SDImageCachesManager alloc] init];
+    SDImageCache *cache1 = [[SDImageCache alloc] initWithNamespace:@"cache1"];
+    SDImageCache *cache2 = [[SDImageCache alloc] initWithNamespace:@"cache2"];
+    cachesManager.caches = @[cache1, cache2];
+    
+    [[NSFileManager defaultManager] removeItemAtPath:cache1.diskCachePath error:nil];
+    [[NSFileManager defaultManager] removeItemAtPath:cache2.diskCachePath error:nil];
+    
+    // LowestOnly
+    cachesManager.queryOperationPolicy = SDImageCachesManagerOperationPolicyLowestOnly;
+    cachesManager.storeOperationPolicy = SDImageCachesManagerOperationPolicyLowestOnly;
+    cachesManager.removeOperationPolicy = SDImageCachesManagerOperationPolicyLowestOnly;
+    cachesManager.containsOperationPolicy = SDImageCachesManagerOperationPolicyLowestOnly;
+    cachesManager.clearOperationPolicy = SDImageCachesManagerOperationPolicyLowestOnly;
+    [cachesManager queryImageForKey:kTestImageKeyJPEG options:0 context:nil cacheType:SDImageCacheTypeAll completion:^(UIImage * _Nullable image, NSData * _Nullable data, SDImageCacheType cacheType) {
+        expect(image).to.beNil();
+    }];
+    [cachesManager storeImage:[self testJPEGImage] imageData:nil forKey:kTestImageKeyJPEG cacheType:SDImageCacheTypeMemory completion:nil];
+    // Check Logic works, cache1 only
+    UIImage *memoryImage1 = [cache1 imageFromMemoryCacheForKey:kTestImageKeyJPEG];
+    expect(memoryImage1).equal([self testJPEGImage]);
+    [cachesManager containsImageForKey:kTestImageKeyJPEG cacheType:SDImageCacheTypeMemory completion:^(SDImageCacheType containsCacheType) {
+        expect(containsCacheType).equal(SDImageCacheTypeMemory);
+    }];
+    [cachesManager removeImageForKey:kTestImageKeyJPEG cacheType:SDImageCacheTypeMemory completion:nil];
+    [cachesManager clearWithCacheType:SDImageCacheTypeMemory completion:nil];
+    
+    // HighestOnly
+    cachesManager.queryOperationPolicy = SDImageCachesManagerOperationPolicyHighestOnly;
+    cachesManager.storeOperationPolicy = SDImageCachesManagerOperationPolicyHighestOnly;
+    cachesManager.removeOperationPolicy = SDImageCachesManagerOperationPolicyHighestOnly;
+    cachesManager.containsOperationPolicy = SDImageCachesManagerOperationPolicyHighestOnly;
+    cachesManager.clearOperationPolicy = SDImageCachesManagerOperationPolicyHighestOnly;
+    [cachesManager queryImageForKey:kTestImageKeyPNG options:0 context:nil cacheType:SDImageCacheTypeAll completion:^(UIImage * _Nullable image, NSData * _Nullable data, SDImageCacheType cacheType) {
+        expect(image).to.beNil();
+    }];
+    [cachesManager storeImage:[self testPNGImage] imageData:nil forKey:kTestImageKeyPNG cacheType:SDImageCacheTypeMemory completion:nil];
+    // Check Logic works, cache2 only
+    UIImage *memoryImage2 = [cache2 imageFromMemoryCacheForKey:kTestImageKeyPNG];
+    expect(memoryImage2).equal([self testPNGImage]);
+    [cachesManager containsImageForKey:kTestImageKeyPNG cacheType:SDImageCacheTypeMemory completion:^(SDImageCacheType containsCacheType) {
+        expect(containsCacheType).equal(SDImageCacheTypeMemory);
+    }];
+    [cachesManager removeImageForKey:kTestImageKeyPNG cacheType:SDImageCacheTypeMemory completion:nil];
+    [cachesManager clearWithCacheType:SDImageCacheTypeMemory completion:nil];
+}
+
+- (void)test56SDImageCachesManagerOperationPolicyConcurrent {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"SDImageCachesManager operation cocurrent policy works"];
+    SDImageCachesManager *cachesManager = [[SDImageCachesManager alloc] init];
+    SDImageCache *cache1 = [[SDImageCache alloc] initWithNamespace:@"cache1"];
+    SDImageCache *cache2 = [[SDImageCache alloc] initWithNamespace:@"cache2"];
+    cachesManager.caches = @[cache1, cache2];
+    
+    [[NSFileManager defaultManager] removeItemAtPath:cache1.diskCachePath error:nil];
+    [[NSFileManager defaultManager] removeItemAtPath:cache2.diskCachePath error:nil];
+    
+    NSString *kConcurrentTestImageKey = @"kConcurrentTestImageKey";
+    
+    // Cocurrent
+    // Check all concurrent op
+    cachesManager.queryOperationPolicy = SDImageCachesManagerOperationPolicyConcurrent;
+    cachesManager.storeOperationPolicy = SDImageCachesManagerOperationPolicyConcurrent;
+    cachesManager.removeOperationPolicy = SDImageCachesManagerOperationPolicyConcurrent;
+    cachesManager.containsOperationPolicy = SDImageCachesManagerOperationPolicyConcurrent;
+    cachesManager.clearOperationPolicy = SDImageCachesManagerOperationPolicyConcurrent;
+    [cachesManager queryImageForKey:kConcurrentTestImageKey options:0 context:nil cacheType:SDImageCacheTypeAll completion:nil];
+    [cachesManager storeImage:[self testJPEGImage] imageData:nil forKey:kConcurrentTestImageKey cacheType:SDImageCacheTypeMemory completion:nil];
+    [cachesManager removeImageForKey:kConcurrentTestImageKey cacheType:SDImageCacheTypeMemory completion:nil];
+    [cachesManager clearWithCacheType:SDImageCacheTypeMemory completion:nil];
+    
+    // Check Logic works, check cache1(memory+JPEG) & cache2(disk+PNG) at the same time. Cache1(memory) is fast and hit.
+    [cache1 storeImage:[self testJPEGImage] forKey:kConcurrentTestImageKey toDisk:NO completion:nil];
+    [cache2 storeImage:[self testPNGImage] forKey:kConcurrentTestImageKey toDisk:YES completion:^{
+        UIImage *memoryImage1 = [cache1 imageFromMemoryCacheForKey:kConcurrentTestImageKey];
+        expect(memoryImage1).notTo.beNil();
+        [cache2 removeImageFromMemoryForKey:kConcurrentTestImageKey];
+        [cachesManager containsImageForKey:kConcurrentTestImageKey cacheType:SDImageCacheTypeAll completion:^(SDImageCacheType containsCacheType) {
+            // Cache1 hit
+            expect(containsCacheType).equal(SDImageCacheTypeMemory);
+            [expectation fulfill];
+        }];
+    }];
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test57SDImageCachesManagerOperationPolicySerial {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"SDImageCachesManager operation serial policy works"];
+    SDImageCachesManager *cachesManager = [[SDImageCachesManager alloc] init];
+    SDImageCache *cache1 = [[SDImageCache alloc] initWithNamespace:@"cache1"];
+    SDImageCache *cache2 = [[SDImageCache alloc] initWithNamespace:@"cache2"];
+    cachesManager.caches = @[cache1, cache2];
+    
+    NSString *kSerialTestImageKey = @"kSerialTestImageKey";
+    
+    // Serial
+    // Check all serial op
+    cachesManager.queryOperationPolicy = SDImageCachesManagerOperationPolicySerial;
+    cachesManager.storeOperationPolicy = SDImageCachesManagerOperationPolicySerial;
+    cachesManager.removeOperationPolicy = SDImageCachesManagerOperationPolicySerial;
+    cachesManager.containsOperationPolicy = SDImageCachesManagerOperationPolicySerial;
+    cachesManager.clearOperationPolicy = SDImageCachesManagerOperationPolicySerial;
+    [cachesManager queryImageForKey:kSerialTestImageKey options:0 context:nil cacheType:SDImageCacheTypeAll completion:nil];
+    [cachesManager storeImage:[self testJPEGImage] imageData:nil forKey:kSerialTestImageKey cacheType:SDImageCacheTypeMemory completion:nil];
+    [cachesManager removeImageForKey:kSerialTestImageKey cacheType:SDImageCacheTypeMemory completion:nil];
+    [cachesManager clearWithCacheType:SDImageCacheTypeMemory completion:nil];
+    
+    // Check Logic work, from cache2(disk+PNG) -> cache1(memory+JPEG). Cache2(disk) is slow but hit.
+    [cache1 storeImage:[self testJPEGImage] forKey:kSerialTestImageKey toDisk:NO completion:nil];
+    [cache2 storeImage:[self testPNGImage] forKey:kSerialTestImageKey toDisk:YES completion:^{
+        UIImage *memoryImage1 = [cache1 imageFromMemoryCacheForKey:kSerialTestImageKey];
+        expect(memoryImage1).notTo.beNil();
+        [cache2 removeImageFromMemoryForKey:kSerialTestImageKey];
+        [cachesManager containsImageForKey:kSerialTestImageKey cacheType:SDImageCacheTypeAll completion:^(SDImageCacheType containsCacheType) {
+            // Cache2 hit
+            expect(containsCacheType).equal(SDImageCacheTypeDisk);
+            [expectation fulfill];
+        }];
+    }];
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test58CustomImageCache {
+    NSString *cachePath = [[self userCacheDirectory] stringByAppendingPathComponent:@"custom"];
+    SDImageCacheConfig *config = [[SDImageCacheConfig alloc] init];
+    SDWebImageTestCache *cache = [[SDWebImageTestCache alloc] initWithCachePath:cachePath config:config];
+    expect(cache.memoryCache).notTo.beNil();
+    expect(cache.diskCache).notTo.beNil();
+    
+    // Clear
+    [cache clearWithCacheType:SDImageCacheTypeAll completion:nil];
+    // Store
+    UIImage *image1 = self.testJPEGImage;
+    NSString *key1 = @"testJPEGImage";
+    [cache storeImage:image1 imageData:nil forKey:key1 cacheType:SDImageCacheTypeAll completion:nil];
+    // Contain
+    [cache containsImageForKey:key1 cacheType:SDImageCacheTypeAll completion:^(SDImageCacheType containsCacheType) {
+        expect(containsCacheType).equal(SDImageCacheTypeMemory);
+    }];
+    // Query
+    [cache queryImageForKey:key1 options:0 context:nil cacheType:SDImageCacheTypeAll completion:^(UIImage * _Nullable image, NSData * _Nullable data, SDImageCacheType cacheType) {
+        expect(image).equal(image1);
+        expect(data).beNil();
+        expect(cacheType).equal(SDImageCacheTypeMemory);
+    }];
+    // Remove
+    [cache removeImageForKey:key1 cacheType:SDImageCacheTypeAll completion:nil];
+    // Contain
+    [cache containsImageForKey:key1 cacheType:SDImageCacheTypeAll completion:^(SDImageCacheType containsCacheType) {
+        expect(containsCacheType).equal(SDImageCacheTypeNone);
+    }];
+    // Clear
+    [cache clearWithCacheType:SDImageCacheTypeAll completion:nil];
+    NSArray<NSString *> *cacheFiles = [cache.diskCache.fileManager contentsOfDirectoryAtPath:cachePath error:nil];
+    expect(cacheFiles.count).equal(0);
+}
+
 #pragma mark Helper methods
 
-- (UIImage *)imageForTesting{
+- (UIImage *)testJPEGImage {
     static UIImage *reusableImage = nil;
     if (!reusableImage) {
-        reusableImage = [UIImage imageWithContentsOfFile:[self testImagePath]];
+        reusableImage = [[UIImage alloc] initWithContentsOfFile:[self testJPEGPath]];
     }
     return reusableImage;
 }
 
-- (NSString *)testImagePath {
-    
+- (UIImage *)testPNGImage {
+    static UIImage *reusableImage = nil;
+    if (!reusableImage) {
+        reusableImage = [[UIImage alloc] initWithContentsOfFile:[self testPNGPath]];
+    }
+    return reusableImage;
+}
+
+- (UIImage *)testGIFImage {
+    static UIImage *reusableImage = nil;
+    if (!reusableImage) {
+        NSData *data = [NSData dataWithContentsOfFile:[self testGIFPath]];
+        reusableImage = [UIImage sd_imageWithData:data];
+    }
+    return reusableImage;
+}
+
+- (UIImage *)testAPNGImage {
+    static UIImage *reusableImage = nil;
+    if (!reusableImage) {
+        NSData *data = [NSData dataWithContentsOfFile:[self testAPNGPath]];
+        reusableImage = [UIImage sd_imageWithData:data];
+    }
+    return reusableImage;
+}
+
+- (NSString *)testJPEGPath {
     NSBundle *testBundle = [NSBundle bundleForClass:[self class]];
     return [testBundle pathForResource:@"TestImage" ofType:@"jpg"];
 }
 
+- (NSString *)testPNGPath {
+    NSBundle *testBundle = [NSBundle bundleForClass:[self class]];
+    return [testBundle pathForResource:@"TestImage" ofType:@"png"];
+}
+
+- (NSString *)testGIFPath {
+    NSBundle *testBundle = [NSBundle bundleForClass:[self class]];
+    NSString *testPath = [testBundle pathForResource:@"TestImage" ofType:@"gif"];
+    return testPath;
+}
+
+- (NSString *)testAPNGPath {
+    NSBundle *testBundle = [NSBundle bundleForClass:[self class]];
+    NSString *testPath = [testBundle pathForResource:@"TestImageAnimated" ofType:@"apng"];
+    return testPath;
+}
+
+- (nullable NSString *)userCacheDirectory {
+    NSArray<NSString *> *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
+    return paths.firstObject;
+}
+
 @end
diff --git a/Tests/Tests/SDImageCoderTests.m b/Tests/Tests/SDImageCoderTests.m
new file mode 100644
index 000000000..85ae2b7de
--- /dev/null
+++ b/Tests/Tests/SDImageCoderTests.m
@@ -0,0 +1,944 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ * (c) Matt Galloway
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDTestCase.h"
+#import "UIColor+SDHexString.h"
+
+@interface SDWebImageDecoderTests : SDTestCase
+
+@end
+
+@implementation SDWebImageDecoderTests
+
+- (void)test01ThatDecodedImageWithNilImageReturnsNil {
+    expect([UIImage sd_decodedImageWithImage:nil]).to.beNil();
+    expect([UIImage sd_decodedAndScaledDownImageWithImage:nil]).to.beNil();
+}
+
+- (void)test02ThatDecodedImageWithImageWorksWithARegularJPGImage {
+    NSString *testImagePath = [[NSBundle bundleForClass:[self class]] pathForResource:@"TestImage" ofType:@"jpg"];
+    UIImage *image = [[UIImage alloc] initWithContentsOfFile:testImagePath];
+    UIImage *decodedImage = [UIImage sd_decodedImageWithImage:image];
+    expect(decodedImage).toNot.beNil();
+    expect(decodedImage).toNot.equal(image);
+    expect(decodedImage.size.width).to.equal(image.size.width);
+    expect(decodedImage.size.height).to.equal(image.size.height);
+}
+
+- (void)test03ThatDecodedImageWithImageDoesNotDecodeAnimatedImages {
+    NSString *testImagePath = [[NSBundle bundleForClass:[self class]] pathForResource:@"TestImage" ofType:@"gif"];
+    UIImage *image = [[UIImage alloc] initWithContentsOfFile:testImagePath];
+#if SD_MAC
+    UIImage *animatedImage = image;
+#else
+    UIImage *animatedImage = [UIImage animatedImageWithImages:@[image] duration:0];
+#endif
+    UIImage *decodedImage = [UIImage sd_decodedImageWithImage:animatedImage];
+    expect(decodedImage).toNot.beNil();
+    expect(decodedImage).to.equal(animatedImage);
+}
+
+- (void)test04ThatDecodedImageWithImageWorksWithAlphaImages {
+    NSString *testImagePath = [[NSBundle bundleForClass:[self class]] pathForResource:@"TestImage" ofType:@"png"];
+    UIImage *image = [[UIImage alloc] initWithContentsOfFile:testImagePath];
+    UIImage *decodedImage = [UIImage sd_decodedImageWithImage:image];
+    expect(decodedImage).toNot.beNil();
+    expect(decodedImage).toNot.equal(image);
+}
+
+- (void)test05ThatDecodedImageWithImageWorksEvenWithMonochromeImage {
+    NSString *testImagePath = [[NSBundle bundleForClass:[self class]] pathForResource:@"MonochromeTestImage" ofType:@"jpg"];
+    UIImage *image = [[UIImage alloc] initWithContentsOfFile:testImagePath];
+    UIImage *decodedImage = [UIImage sd_decodedImageWithImage:image];
+    expect(decodedImage).toNot.beNil();
+    expect(decodedImage).toNot.equal(image);
+    expect(decodedImage.size.width).to.equal(image.size.width);
+    expect(decodedImage.size.height).to.equal(image.size.height);
+}
+
+- (void)test06ThatDecodeAndScaleDownImageWorks {
+    NSString *testImagePath = [[NSBundle bundleForClass:[self class]] pathForResource:@"TestImageLarge" ofType:@"jpg"];
+    UIImage *image = [[UIImage alloc] initWithContentsOfFile:testImagePath];
+    UIImage *decodedImage = [UIImage sd_decodedAndScaledDownImageWithImage:image limitBytes:(60 * 1024 * 1024)];
+    expect(decodedImage).toNot.beNil();
+    expect(decodedImage).toNot.equal(image);
+    expect(decodedImage.size.width).toNot.equal(image.size.width);
+    expect(decodedImage.size.height).toNot.equal(image.size.height);
+    expect(decodedImage.size.width * decodedImage.size.height).to.beLessThanOrEqualTo(60 * 1024 * 1024 / 4);    // how many pixels in 60 megs
+}
+
+- (void)test07ThatDecodeAndScaleDownImageDoesNotScaleSmallerImage {
+    // check when user use the larget bytes than image pixels byets, we do not scale up the image (defaults 60MB means 3965x3965 pixels)
+    NSString *testImagePath = [[NSBundle bundleForClass:[self class]] pathForResource:@"TestImage" ofType:@"jpg"];
+    UIImage *image = [[UIImage alloc] initWithContentsOfFile:testImagePath];
+    UIImage *decodedImage = [UIImage sd_decodedAndScaledDownImageWithImage:image];
+    expect(decodedImage).toNot.beNil();
+    expect(decodedImage).toNot.equal(image);
+    expect(decodedImage.size.width).to.equal(image.size.width);
+    expect(decodedImage.size.height).to.equal(image.size.height);
+}
+
+- (void)test07ThatDecodeAndScaleDownImageScaleSmallerBytes {
+    // Check when user provide too small bytes, we scale it down to 1x1, but not return the force decoded original size image
+    NSString *testImagePath = [[NSBundle bundleForClass:[self class]] pathForResource:@"TestImage" ofType:@"jpg"];
+    UIImage *image = [[UIImage alloc] initWithContentsOfFile:testImagePath];
+    UIImage *decodedImage = [UIImage sd_decodedAndScaledDownImageWithImage:image limitBytes:1];
+    expect(decodedImage).toNot.beNil();
+    expect(decodedImage).toNot.equal(image);
+    expect(decodedImage.size.width).to.equal(1);
+    expect(decodedImage.size.height).to.equal(1);
+}
+
+-(void)test07ThatDecodeAndScaleDownAlwaysCompleteRendering {
+    // Check that when the height of the image used is not evenly divisible by the height of the tile, the output image can also be rendered completely.
+    
+    // Check that when the height of the image used will led to loss of precision. the output image can also be rendered completely,
+    
+    UIColor *imageColor = UIColor.blackColor;
+    CGSize imageSize = CGSizeMake(1029, 1029);
+    CGRect imageRect = CGRectMake(0, 0, imageSize.width, imageSize.height);
+    SDGraphicsImageRendererFormat *format = [[SDGraphicsImageRendererFormat alloc] init];
+    format.scale = 1;
+    SDGraphicsImageRenderer *renderer = [[SDGraphicsImageRenderer alloc] initWithSize:imageSize format:format];
+    UIImage *image = [renderer imageWithActions:^(CGContextRef  _Nonnull context) {
+        CGContextSetFillColorWithColor(context, [imageColor CGColor]);
+        CGContextFillRect(context, imageRect);
+    }];
+    
+    UIImage *decodedImage = [UIImage sd_decodedAndScaledDownImageWithImage:image limitBytes:1 * 1024 * 1024];
+    UIColor *testColor1 = [decodedImage sd_colorAtPoint:CGPointMake(0, decodedImage.size.height - 1)];
+    UIColor *testColor2 = [decodedImage sd_colorAtPoint:CGPointMake(0, decodedImage.size.height - 9)];
+    expect(testColor1.sd_hexString).equal(imageColor.sd_hexString);
+    expect(testColor2.sd_hexString).equal(imageColor.sd_hexString);
+}
+
+- (void)test08ThatEncodeAlphaImageToJPGWithBackgroundColor {
+    NSString *testImagePath = [[NSBundle bundleForClass:[self class]] pathForResource:@"TestImage" ofType:@"png"];
+    UIImage *image = [[UIImage alloc] initWithContentsOfFile:testImagePath];
+    UIColor *backgroundColor = [UIColor blackColor];
+    NSData *encodedData = [SDImageCodersManager.sharedManager encodedDataWithImage:image format:SDImageFormatJPEG options:@{SDImageCoderEncodeBackgroundColor : backgroundColor}];
+    expect(encodedData).notTo.beNil();
+    UIImage *decodedImage = [SDImageCodersManager.sharedManager decodedImageWithData:encodedData options:nil];
+    expect(decodedImage).notTo.beNil();
+    expect(decodedImage.size.width).to.equal(image.size.width);
+    expect(decodedImage.size.height).to.equal(image.size.height);
+    // Check background color, should not be white but the black color
+    UIColor *testColor = [decodedImage sd_colorAtPoint:CGPointMake(1, 1)];
+    expect(testColor.sd_hexString).equal(backgroundColor.sd_hexString);
+}
+
+- (void)test09ThatJPGImageEncodeWithMaxFileSize {
+    NSString *testImagePath = [[NSBundle bundleForClass:[self class]] pathForResource:@"TestImageLarge" ofType:@"jpg"];
+    UIImage *image = [[UIImage alloc] initWithContentsOfFile:testImagePath];
+    // This large JPEG encoding size between (770KB ~ 2.23MB)
+    NSUInteger limitFileSize = 1 * 1024 * 1024; // 1MB
+    // 100 quality (biggest)
+    NSData *maxEncodedData = [SDImageCodersManager.sharedManager encodedDataWithImage:image format:SDImageFormatJPEG options:nil];
+    expect(maxEncodedData).notTo.beNil();
+    expect(maxEncodedData.length).beGreaterThan(limitFileSize);
+    // 0 quality (smallest)
+    NSData *minEncodedData = [SDImageCodersManager.sharedManager encodedDataWithImage:image format:SDImageFormatJPEG options:@{SDImageCoderEncodeCompressionQuality : @(0.01)}]; // Seems 0 has some bugs in old macOS
+    expect(minEncodedData).notTo.beNil();
+    expect(minEncodedData.length).beLessThan(limitFileSize);
+    NSData *limitEncodedData = [SDImageCodersManager.sharedManager encodedDataWithImage:image format:SDImageFormatJPEG options:@{SDImageCoderEncodeMaxFileSize : @(limitFileSize)}];
+    expect(limitEncodedData).notTo.beNil();
+    // So, if we limit the file size, the output data should in (770KB ~ 2.23MB)
+    expect(limitEncodedData.length).beLessThan(maxEncodedData.length);
+    expect(limitEncodedData.length).beGreaterThan(minEncodedData.length);
+}
+
+- (void)test10ThatAnimatedImageCacheImmediatelyWorks {
+    NSString *testImagePath = [[NSBundle bundleForClass:[self class]] pathForResource:@"TestImageLarge" ofType:@"png"];
+    NSData *testImageData = [NSData dataWithContentsOfFile:testImagePath];
+    
+    // Check that animated image rendering should not use lazy decoding (performance related)
+    CFAbsoluteTime begin = CFAbsoluteTimeGetCurrent();
+    SDImageAPNGCoder *coder = [[SDImageAPNGCoder alloc] initWithAnimatedImageData:testImageData options:@{SDImageCoderDecodeFirstFrameOnly : @(NO)}];
+    UIImage *imageWithoutLazyDecoding = [coder animatedImageFrameAtIndex:0];
+    CFAbsoluteTime end = CFAbsoluteTimeGetCurrent();
+    CFAbsoluteTime duration = end - begin;
+    expect(imageWithoutLazyDecoding.sd_isDecoded).beTruthy();
+    
+    // Check that static image rendering should use lazy decoding
+    CFAbsoluteTime begin2 = CFAbsoluteTimeGetCurrent();
+    SDImageAPNGCoder *coder2 = SDImageAPNGCoder.sharedCoder;
+    UIImage *imageWithLazyDecoding = [coder2 decodedImageWithData:testImageData options:@{SDImageCoderDecodeFirstFrameOnly : @(YES)}];
+    CFAbsoluteTime end2 = CFAbsoluteTimeGetCurrent();
+    CFAbsoluteTime duration2 = end2 - begin2;
+    expect(imageWithLazyDecoding.sd_isDecoded).beFalsy();
+    
+    // lazy decoding need less time (10x)
+    expect(duration2 * 10.0).beLessThan(duration);
+}
+
+- (void)test11ThatAPNGPCoderWorks {
+    NSURL *APNGURL = [[NSBundle bundleForClass:[self class]] URLForResource:@"TestImageAnimated" withExtension:@"apng"];
+    [self verifyCoder:[SDImageAPNGCoder sharedCoder]
+    withLocalImageURL:APNGURL
+     supportsEncoding:YES
+      isAnimatedImage:YES];
+}
+
+- (void)test12ThatGIFCoderWorks {
+    NSURL *gifURL = [[NSBundle bundleForClass:[self class]] URLForResource:@"TestImage" withExtension:@"gif"];
+    [self verifyCoder:[SDImageGIFCoder sharedCoder]
+    withLocalImageURL:gifURL
+     supportsEncoding:YES
+      isAnimatedImage:YES];
+}
+
+- (void)test12ThatGIFWithoutLoopCountPlayOnce {
+    // When GIF metadata does not contains any loop count information (`kCGImagePropertyGIFLoopCount`'s value nil)
+    // The standard says it should just play once. See: http://www6.uniovi.es/gifanim/gifabout.htm
+    // This behavior is different from other modern animated image format like APNG/WebP. Which will play infinitely
+    NSString *testImagePath = [[NSBundle bundleForClass:[self class]] pathForResource:@"TestLoopCount" ofType:@"gif"];
+    NSData *testImageData = [NSData dataWithContentsOfFile:testImagePath];
+    UIImage *image = [SDImageGIFCoder.sharedCoder decodedImageWithData:testImageData options:nil];
+    expect(image.sd_imageLoopCount).equal(1);
+}
+
+- (void)test13ThatHEICWorks {
+    if (@available(iOS 11, tvOS 11, macOS 10.13, *)) {
+        NSURL *heicURL = [[NSBundle bundleForClass:[self class]] URLForResource:@"TestImage" withExtension:@"heic"];
+#if SD_MAC
+        BOOL supportsEncoding = !SDTestCase.isCI; // GitHub Action Mac env currently does not support HEIC encoding
+#else
+        BOOL supportsEncoding = YES; // GitHub Action Mac env with simulator, supported from 20240707.1
+#endif
+        [self verifyCoder:[SDImageIOCoder sharedCoder]
+        withLocalImageURL:heicURL
+         supportsEncoding:supportsEncoding
+          isAnimatedImage:NO];
+    }
+}
+
+- (void)test14ThatHEIFWorks {
+    if (@available(iOS 11, tvOS 11, macOS 10.13, *)) {
+        NSURL *heifURL = [[NSBundle bundleForClass:[self class]] URLForResource:@"TestImage" withExtension:@"heif"];
+        BOOL supportsEncoding = NO; // public.heif UTI alwsays return false, use public.heic
+        [self verifyCoder:[SDImageIOCoder sharedCoder]
+        withLocalImageURL:heifURL
+         supportsEncoding:supportsEncoding
+          isAnimatedImage:NO];
+    }
+}
+
+- (void)test15ThatCodersManagerWorks {
+    SDImageCodersManager *manager = [[SDImageCodersManager alloc] init];
+    manager.coders = @[SDImageIOCoder.sharedCoder];
+    expect([manager canDecodeFromData:nil]).beTruthy(); // Image/IO will return YES for future format
+    expect([manager decodedImageWithData:nil options:nil]).beNil();
+    expect([manager canEncodeToFormat:SDImageFormatUndefined]).beTruthy(); // Image/IO will return YES for future format
+    expect([manager encodedDataWithImage:nil format:SDImageFormatUndefined options:nil]).beNil();
+}
+
+- (void)test16ThatHEICAnimatedWorks {
+    if (@available(iOS 13, tvOS 13, macOS 10.15, *)) {
+        NSURL *heicURL = [[NSBundle bundleForClass:[self class]] URLForResource:@"TestImageAnimated" withExtension:@"heics"];
+        BOOL supportsEncoding = !SDTestCase.isCI; // GitHub Action Mac env currently does not support HEICS animated encoding (but HEIC supported, I don't know why)
+        // See: #3227
+        BOOL isAnimatedImage = YES;
+        [self verifyCoder:[SDImageHEICCoder sharedCoder]
+        withLocalImageURL:heicURL
+         supportsEncoding:supportsEncoding
+           encodingFormat:SDImageFormatHEIC
+          isAnimatedImage:isAnimatedImage
+            isVectorImage:NO];
+    }
+}
+
+- (void)test17ThatPDFWorks {
+    NSURL *pdfURL = [[NSBundle bundleForClass:[self class]] URLForResource:@"TestImage" withExtension:@"pdf"];
+    [self verifyCoder:[SDImageIOCoder sharedCoder]
+    withLocalImageURL:pdfURL
+     supportsEncoding:NO
+       encodingFormat:SDImageFormatUndefined
+      isAnimatedImage:NO
+        isVectorImage:YES];
+}
+
+#if !SD_TV
+- (void)test18ThatStaticWebPWorks {
+    if (@available(iOS 14, tvOS 14, macOS 11, *)) {
+        NSURL *staticWebPURL = [[NSBundle bundleForClass:[self class]] URLForResource:@"TestImageStatic" withExtension:@"webp"];
+        [self verifyCoder:[SDImageAWebPCoder sharedCoder]
+        withLocalImageURL:staticWebPURL
+         supportsEncoding:NO // Currently (iOS 14.0) seems no encoding support
+           encodingFormat:SDImageFormatWebP
+          isAnimatedImage:NO
+            isVectorImage:NO];
+    }
+}
+#endif
+
+#if !SD_TV
+- (void)test19ThatAnimatedWebPWorks {
+    if (@available(iOS 14, tvOS 14, macOS 11, *)) {
+        NSURL *staticWebPURL = [[NSBundle bundleForClass:[self class]] URLForResource:@"TestImageAnimated" withExtension:@"webp"];
+        [self verifyCoder:[SDImageAWebPCoder sharedCoder]
+        withLocalImageURL:staticWebPURL
+         supportsEncoding:NO // Currently (iOS 14.0) seems no encoding support
+           encodingFormat:SDImageFormatWebP
+          isAnimatedImage:YES
+            isVectorImage:NO];
+    }
+}
+#endif
+
+- (void)test20ThatImageIOAnimatedCoderAbstractClass {
+    SDImageIOAnimatedCoder *coder = [[SDImageIOAnimatedCoder alloc] init];
+    @try {
+        [coder canEncodeToFormat:SDImageFormatPNG];
+        XCTFail("Should throw exception");
+    } @catch (NSException *exception) {
+        expect(exception);
+    }
+}
+
+- (void)test21ThatEmbedThumbnailHEICWorks {
+#if SD_MAC
+    BOOL supportsEncoding = !SDTestCase.isCI; // GitHub Action Mac env currently does not support HEIC encoding
+#else
+    BOOL supportsEncoding = YES; // GitHub Action Mac env with simulator, supported from 20240707.1
+#endif
+    if (!supportsEncoding) {
+        return;
+    }
+    if (@available(iOS 11, tvOS 11, macOS 10.13, *)) {
+        // The input HEIC does not contains any embed thumbnail
+        NSURL *heicURL = [[NSBundle bundleForClass:[self class]] URLForResource:@"TestImage" withExtension:@"heic"];
+        CGImageSourceRef source = CGImageSourceCreateWithURL((__bridge CFURLRef)heicURL, nil);
+        expect(source).notTo.beNil();
+        NSArray *thumbnailImages = [self thumbnailImagesFromImageSource:source];
+        expect(thumbnailImages.count).equal(0);
+        
+        CGImageRef imageRef = CGImageSourceCreateImageAtIndex(source, 0, nil);
+#if SD_UIKIT
+        UIImage *image = [[UIImage alloc] initWithCGImage:imageRef scale:1 orientation: UIImageOrientationUp];
+#else
+        UIImage *image = [[UIImage alloc] initWithCGImage:imageRef scale:1 orientation:kCGImagePropertyOrientationUp];
+#endif
+        CGImageRelease(imageRef);
+        // Encode with embed thumbnail
+        NSData *encodedData = [SDImageIOCoder.sharedCoder encodedDataWithImage:image format:SDImageFormatHEIC options:@{SDImageCoderEncodeEmbedThumbnail : @(YES)}];
+        
+        // The new HEIC contains one embed thumbnail
+        CGImageSourceRef source2 = CGImageSourceCreateWithData((__bridge CFDataRef)encodedData, nil);
+        expect(source2).notTo.beNil();
+        NSArray *thumbnailImages2 = [self thumbnailImagesFromImageSource:source2];
+        expect(thumbnailImages2.count).equal(1);
+        
+        // Currently ImageIO has no control to custom embed thumbnail pixel size, just check the behavior :)
+        NSDictionary *thumbnailImageInfo = thumbnailImages2.firstObject;
+        NSUInteger thumbnailWidth = [thumbnailImageInfo[(__bridge NSString *)kCGImagePropertyWidth] unsignedIntegerValue];
+        NSUInteger thumbnailHeight = [thumbnailImageInfo[(__bridge NSString *)kCGImagePropertyHeight] unsignedIntegerValue];
+        expect(thumbnailWidth).equal(320);
+        expect(thumbnailHeight).equal(212);
+    }
+}
+
+- (void)test22ThatThumbnailDecodeCalculation {
+    NSString *testImagePath = [[NSBundle bundleForClass:[self class]] pathForResource:@"TestImageLarge" ofType:@"jpg"];
+    NSData *testImageData = [NSData dataWithContentsOfFile:testImagePath];
+    CGSize thumbnailSize = CGSizeMake(400, 300);
+    UIImage *image = [SDImageIOCoder.sharedCoder decodedImageWithData:testImageData options:@{
+        SDImageCoderDecodePreserveAspectRatio: @(YES),
+        SDImageCoderDecodeThumbnailPixelSize: @(thumbnailSize)}];
+    CGSize imageSize = image.size;
+    expect(imageSize.width).equal(400);
+    expect(imageSize.height).equal(263);
+    // `CGImageSourceCreateThumbnailAtIndex` should always produce non-lazy CGImage
+    CGImageRef cgImage = image.CGImage;
+    expect([SDImageCoderHelper CGImageIsLazy:cgImage]).beFalsy();
+    expect(image.sd_isDecoded).beTruthy();
+}
+
+- (void)test23ThatThumbnailEncodeCalculation {
+    NSString *testImagePath = [[NSBundle bundleForClass:[self class]] pathForResource:@"TestImageLarge" ofType:@"jpg"];
+    NSData *testImageData = [NSData dataWithContentsOfFile:testImagePath];
+    UIImage *image = [SDImageIOCoder.sharedCoder decodedImageWithData:testImageData options:nil];
+    expect(image.size).equal(CGSizeMake(5250, 3450));
+    // `CGImageSourceCreateImageAtIndex` should always produce lazy CGImage
+    CGImageRef cgImage = image.CGImage;
+    expect([SDImageCoderHelper CGImageIsLazy:cgImage]).beTruthy();
+    expect(image.sd_isDecoded).beFalsy();
+    CGSize thumbnailSize = CGSizeMake(4000, 4000); // 3450 < 4000 < 5250
+    NSData *encodedData = [SDImageIOCoder.sharedCoder encodedDataWithImage:image format:SDImageFormatJPEG options:@{
+            SDImageCoderEncodeMaxPixelSize: @(thumbnailSize)
+    }];
+    UIImage *encodedImage = [UIImage sd_imageWithData:encodedData];
+    expect(encodedImage.size).equal(CGSizeMake(4000, 2629));
+}
+
+- (void)test24ThatScaleSizeCalculation {
+    // preserveAspectRatio true
+    CGSize size1 = [SDImageCoderHelper scaledSizeWithImageSize:CGSizeMake(100, 200) scaleSize:CGSizeMake(150, 150) preserveAspectRatio:YES shouldScaleUp:NO];
+    expect(size1).equal(CGSizeMake(75, 150));
+    CGSize size2 = [SDImageCoderHelper scaledSizeWithImageSize:CGSizeMake(100, 200) scaleSize:CGSizeMake(150, 150) preserveAspectRatio:YES shouldScaleUp:YES];
+    expect(size2).equal(CGSizeMake(75, 150));
+    CGSize size3 = [SDImageCoderHelper scaledSizeWithImageSize:CGSizeMake(100, 200) scaleSize:CGSizeMake(300, 300) preserveAspectRatio:YES shouldScaleUp:NO];
+    expect(size3).equal(CGSizeMake(100, 200));
+    CGSize size4 = [SDImageCoderHelper scaledSizeWithImageSize:CGSizeMake(100, 200) scaleSize:CGSizeMake(300, 300) preserveAspectRatio:YES shouldScaleUp:YES];
+    expect(size4).equal(CGSizeMake(150, 300));
+    
+    // preserveAspectRatio false
+    CGSize size5 = [SDImageCoderHelper scaledSizeWithImageSize:CGSizeMake(100, 200) scaleSize:CGSizeMake(150, 150) preserveAspectRatio:NO shouldScaleUp:NO];
+    expect(size5).equal(CGSizeMake(100, 150));
+    CGSize size6 = [SDImageCoderHelper scaledSizeWithImageSize:CGSizeMake(100, 200) scaleSize:CGSizeMake(150, 150) preserveAspectRatio:NO shouldScaleUp:YES];
+    expect(size6).equal(CGSizeMake(150, 150));
+    
+    // 0 value
+    CGSize size7 = [SDImageCoderHelper scaledSizeWithImageSize:CGSizeMake(0, 0) scaleSize:CGSizeMake(999, 999) preserveAspectRatio:NO shouldScaleUp:NO];
+    expect(size7).equal(CGSizeMake(0, 0));
+    CGSize size8 = [SDImageCoderHelper scaledSizeWithImageSize:CGSizeMake(999, 999) scaleSize:CGSizeMake(0, 0) preserveAspectRatio:NO shouldScaleUp:NO];
+    expect(size8).equal(CGSizeMake(999, 999));
+}
+
+- (void)test25ThatBMPWorks {
+    NSURL *bmpURL = [[NSBundle bundleForClass:[self class]] URLForResource:@"TestImage" withExtension:@"bmp"];
+    [self verifyCoder:[SDImageIOCoder sharedCoder]
+    withLocalImageURL:bmpURL
+     supportsEncoding:YES
+       encodingFormat:SDImageFormatBMP
+      isAnimatedImage:NO
+        isVectorImage:NO];
+}
+
+- (void)test26ThatRawImageTypeHintWorks {
+    NSURL *url = [[NSBundle bundleForClass:[self class]] URLForResource:@"TestImage" withExtension:@"nef"];
+    NSData *data = [NSData dataWithContentsOfURL:url];
+    
+    // 1. Test without hint will use TIFF's IFD#0, which size should always be 160x120, see: http://lclevy.free.fr/nef/
+    UIImage *image1 = [SDImageIOCoder.sharedCoder decodedImageWithData:data options:nil];
+    expect(image1.size).equal(CGSizeMake(160, 120));
+    expect(image1.sd_imageFormat).equal(SDImageFormatTIFF);
+    
+#if SD_MAC || SD_IOS
+    // 2. Test with NEF file extension should be NEF
+    UIImage *image2 = [SDImageIOCoder.sharedCoder decodedImageWithData:data options:@{SDImageCoderDecodeFileExtensionHint : @"nef"}];
+    expect(image2.size).equal(CGSizeMake(3008, 2000));
+    expect(image2.sd_imageFormat).equal(SDImageFormatRAW);
+    
+    // 3. Test with UTType hint should be NEF
+    UIImage *image3 = [SDImageIOCoder.sharedCoder decodedImageWithData:data options:@{SDImageCoderDecodeTypeIdentifierHint : @"com.nikon.raw-image"}];
+    expect(image3.size).equal(CGSizeMake(3008, 2000));
+    expect(image3.sd_imageFormat).equal(SDImageFormatRAW);
+#endif
+}
+
+- (void)test27ThatEncodeWithFramesWorks {
+    // Mock
+    NSMutableArray<SDImageFrame *> *frames = [NSMutableArray array];
+    NSUInteger frameCount = 5;
+    for (size_t i = 0; i < frameCount; i++) {
+        CGSize size = CGSizeMake(100, 100);
+        SDGraphicsImageRenderer *renderer = [[SDGraphicsImageRenderer alloc] initWithSize:size];
+        UIImage *image = [renderer imageWithActions:^(CGContextRef  _Nonnull context) {
+            CGContextSetRGBFillColor(context, 1.0 / i, 0.0, 0.0, 1.0);
+            CGContextSetRGBStrokeColor(context, 1.0 / i, 0.0, 0.0, 1.0);
+            CGContextFillRect(context, CGRectMake(0, 0, size.width, size.height));
+        }];
+        SDImageFrame *frame = [SDImageFrame frameWithImage:image duration:0.1];
+        [frames addObject:frame];
+    }
+    
+    // Test old API
+    UIImage *animatedImage = [SDImageCoderHelper animatedImageWithFrames:frames];
+    SDImageFormat format;
+    if (@available(iOS 12.0, tvOS 12.0, macOS 10.14, watchOS 5.0, *)) {
+        format = SDImageFormatPNG;
+    } else {
+        format = SDImageFormatGIF;
+    }
+    NSData *data;
+    if (format == SDImageFormatPNG) {
+        data = [SDImageAPNGCoder.sharedCoder encodedDataWithImage:animatedImage format:format options:nil];;
+    } else {
+        data = [SDImageGIFCoder.sharedCoder encodedDataWithImage:animatedImage format:format options:nil];
+    }
+    expect(data).notTo.beNil();
+
+#if SD_MAC
+    // Test implementation use SDAnimatedImageRep
+    SDAnimatedImageRep *rep = (SDAnimatedImageRep *)animatedImage.representations.firstObject;
+    expect([rep isKindOfClass:SDAnimatedImageRep.class]);
+    expect(rep.animatedImageData).equal(data);
+    expect(rep.animatedImageFormat).equal(format);
+#endif
+    
+    // Test new API
+    NSData *data2 = [SDImageGIFCoder.sharedCoder encodedDataWithFrames:frames loopCount:0 format:SDImageFormatGIF options:nil];
+    expect(data2).notTo.beNil();
+}
+
+- (void)test28ThatNotTriggerCACopyImage {
+    // 10 * 8 pixels, RGBA8888
+    size_t width = 10;
+    size_t height = 8;
+    size_t bitsPerComponent = 8;
+    size_t components = 4;
+    size_t bitsPerPixel = bitsPerComponent * components;
+    size_t bytesPerRow = SDByteAlign(bitsPerPixel / 8 * width, [SDImageCoderHelper preferredPixelFormat:YES].alignment);
+    size_t size = bytesPerRow * height;
+    uint8_t bitmap[size];
+    for (size_t i = 0; i < size; i++) {
+        bitmap[i] = 255;
+    }
+    CGColorSpaceRef colorspace = [SDImageCoderHelper colorSpaceGetDeviceRGB];
+    CGBitmapInfo bitmapInfo = [SDImageCoderHelper preferredPixelFormat:YES].bitmapInfo;
+    CFDataRef data = CFDataCreate(NULL, bitmap, size);
+    CGDataProviderRef provider = CGDataProviderCreateWithCFData(data);
+    CFRelease(data);
+    BOOL shouldInterpolate = YES;
+    CGColorRenderingIntent intent = kCGRenderingIntentDefault;
+    CGImageRef cgImage = CGImageCreate(width, height, bitsPerComponent, bitsPerPixel, bytesPerRow, colorspace, bitmapInfo, provider, NULL, shouldInterpolate, intent);
+    CGDataProviderRelease(provider);
+    XCTAssert(cgImage);
+    BOOL result = [SDImageCoderHelper CGImageIsHardwareSupported:cgImage];
+    // Since it's 32 bytes aligned, return true
+    XCTAssertTrue(result);
+    // Let's force-decode to check again
+#if SD_MAC
+    UIImage *image = [[UIImage alloc] initWithCGImage:cgImage scale:1 orientation:kCGImagePropertyOrientationUp];
+#else
+    UIImage *image = [[UIImage alloc] initWithCGImage:cgImage scale:1 orientation:UIImageOrientationUp];
+#endif
+    CGImageRelease(cgImage);
+    UIImage *newImage = [SDImageCoderHelper decodedImageWithImage:image policy:SDImageForceDecodePolicyAutomatic];
+    // Check policy works, since it's supported by CA hardware, which return the input image object, using pointer compare
+    XCTAssertTrue(image == newImage);
+    BOOL newResult = [SDImageCoderHelper CGImageIsHardwareSupported:newImage.CGImage];
+    XCTAssertTrue(newResult);
+}
+
+- (void)test28ThatDoTriggerCACopyImage {
+    // 10 * 8 pixels, RGBA8888
+    size_t width = 10;
+    size_t height = 8;
+    size_t bitsPerComponent = 8;
+    size_t components = 4;
+    size_t bitsPerPixel = bitsPerComponent * components;
+    size_t bytesPerRow = bitsPerPixel / 8 * width;
+    size_t size = bytesPerRow * height;
+    uint8_t bitmap[size];
+    for (size_t i = 0; i < size; i++) {
+        bitmap[i] = 255;
+    }
+    CGColorSpaceRef colorspace = [SDImageCoderHelper colorSpaceGetDeviceRGB];
+    CGBitmapInfo bitmapInfo = [SDImageCoderHelper preferredPixelFormat:YES].bitmapInfo;
+    CFDataRef data = CFDataCreate(NULL, bitmap, size);
+    CGDataProviderRef provider = CGDataProviderCreateWithCFData(data);
+    CFRelease(data);
+    BOOL shouldInterpolate = YES;
+    CGColorRenderingIntent intent = kCGRenderingIntentDefault;
+    CGImageRef cgImage = CGImageCreate(width, height, bitsPerComponent, bitsPerPixel, bytesPerRow, colorspace, bitmapInfo, provider, NULL, shouldInterpolate, intent);
+    CGDataProviderRelease(provider);
+    XCTAssert(cgImage);
+    BOOL result = [SDImageCoderHelper CGImageIsHardwareSupported:cgImage];
+    // Since it's not 32 bytes aligned, return false
+    XCTAssertFalse(result);
+    // Let's force-decode to check again
+#if SD_MAC
+    UIImage *image = [[UIImage alloc] initWithCGImage:cgImage scale:1 orientation:kCGImagePropertyOrientationUp];
+#else
+    UIImage *image = [[UIImage alloc] initWithCGImage:cgImage scale:1 orientation:UIImageOrientationUp];
+#endif
+    CGImageRelease(cgImage);
+    UIImage *newImage = [SDImageCoderHelper decodedImageWithImage:image policy:SDImageForceDecodePolicyAutomatic];
+    // Check policy works, since it's not supported by CA hardware, which return the different image object
+    XCTAssertFalse(image == newImage);
+    BOOL newResult = [SDImageCoderHelper CGImageIsHardwareSupported:newImage.CGImage];
+    XCTAssertTrue(newResult);
+}
+
+- (void)test29ThatJFIFDecodeOrientationShouldNotApplyTwice {
+    // I don't think this is SDWebImage's issue, it's Apple's ImgeIO Bug, but user complain about this: #3594
+    // In W3C standard, JFIF should always be orientation up, and should not contains EXIF orientation
+    // But some bad image editing tool will generate this kind of image :(
+    NSURL *url = [[NSBundle bundleForClass:[self class]] URLForResource:@"TestJFIF" withExtension:@"jpg"];
+    NSData *data = [NSData dataWithContentsOfURL:url];
+    
+    UIImage *image = [SDImageIOCoder.sharedCoder decodedImageWithData:data options:nil];
+    expect(image.sd_imageFormat).equal(SDImageFormatJPEG);
+#if SD_UIKIT
+    UIImageOrientation orientation = image.imageOrientation;
+    expect(orientation).equal(UIImageOrientationDown);
+#endif
+    
+    UIImage *systemImage = [[UIImage alloc] initWithData:data];
+#if SD_UIKIT
+    orientation = systemImage.imageOrientation;
+    if (@available(iOS 18.0, tvOS 18.0, watchOS 11.0, *)) {
+        // Apple fix/hack this kind of JFIF on iOS 18
+        expect(orientation).equal(UIImageOrientationUp);
+    } else {
+        expect(orientation).equal(UIImageOrientationDown);
+    }
+#endif
+    
+    // Check bitmap color equal, between our usage of ImageIO decoder and Apple system API behavior
+    // So, this means, if Apple has bugs, we have bugs too, it's not our fault :)
+    UIColor *testColor1 = [image sd_colorAtPoint:CGPointMake(1, 1)];
+    UIColor *testColor2 = [systemImage sd_colorAtPoint:CGPointMake(1, 1)];
+    CGFloat r1, g1, b1, a1;
+    CGFloat r2, g2, b2, a2;
+    [testColor1 getRed:&r1 green:&g1 blue:&b1 alpha:&a1];
+    [testColor2 getRed:&r2 green:&g2 blue:&b2 alpha:&a2];
+    expect(r1).beCloseToWithin(r2, 0.01);
+    expect(g1).beCloseToWithin(g2, 0.01);
+    expect(b1).beCloseToWithin(b2, 0.01);
+    expect(a1).beCloseToWithin(a2, 0.01);
+    
+    // Manual test again for Apple's API
+    CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef)data, nil);
+    NSDictionary *properties = (__bridge_transfer NSDictionary *)CGImageSourceCopyPropertiesAtIndex(source, 0, nil);
+    NSUInteger exifOrientation = [properties[(__bridge NSString *)kCGImagePropertyOrientation] unsignedIntegerValue];
+    CFRelease(source);
+    expect(exifOrientation).equal(kCGImagePropertyOrientationDown);
+}
+
+- (void)test30ThatImageIOPNGPluginBuggyWorkaround {
+    // See: #3634
+    NSURL *url = [[NSBundle bundleForClass:[self class]] URLForResource:@"IndexedPNG" withExtension:@"png"];
+    NSData *data = [NSData dataWithContentsOfURL:url];
+    
+    UIImage *decodedImage = [SDImageIOCoder.sharedCoder decodedImageWithData:data options:nil];
+    UIColor *testColor1 = [decodedImage sd_colorAtPoint:CGPointMake(100, 1)];
+    CGFloat r1, g1, b1, a1;
+    [testColor1 getRed:&r1 green:&g1 blue:&b1 alpha:&a1];
+    expect(r1).beCloseToWithin(0.60, 0.01);
+    expect(g1).beCloseToWithin(0.91, 0.01);
+    expect(b1).beCloseToWithin(0.91, 0.01);
+    expect(a1).beCloseToWithin(0.20, 0.01);
+    
+    // RGBA 16 bits PNG should not workaround
+    url = [[NSBundle bundleForClass:[self class]] URLForResource:@"RGBA16PNG" withExtension:@"png"];
+    data = [NSData dataWithContentsOfURL:url];
+    decodedImage = [SDImageIOCoder.sharedCoder decodedImageWithData:data options:nil];
+    CGBitmapInfo bitmapInfo = CGImageGetBitmapInfo(decodedImage.CGImage);
+    size_t bpc = CGImageGetBitsPerComponent(decodedImage.CGImage);
+    expect(bpc).equal(16);
+    CGImageAlphaInfo alphaInfo = bitmapInfo & kCGBitmapAlphaInfoMask;
+    CGImageByteOrderInfo byteOrderInfo = bitmapInfo & kCGBitmapByteOrderMask;
+    expect(alphaInfo).equal(kCGImageAlphaLast);
+    expect(byteOrderInfo).equal(kCGImageByteOrder16Little);
+}
+
+- (void)test31ThatSVGShouldUseNativeImageClass {
+    NSURL *url = [[NSBundle bundleForClass:[self class]] URLForResource:@"TestImage" withExtension:@"svg"];
+    NSData *data = [NSData dataWithContentsOfURL:url];
+    SDAnimatedImage *animatedImage = [SDAnimatedImage imageWithData:data];
+    expect(animatedImage).beNil();
+    UIImage *image = [UIImage sd_imageWithData:data];
+    Class SVGCoderClass = NSClassFromString(@"SDImageSVGCoder");
+    if (SVGCoderClass && [SVGCoderClass sharedCoder]) {
+        expect(image).notTo.beNil();
+        // Vector version
+        expect(image.sd_isVector).beTruthy();
+    } else {
+        // Platform does not support SVG
+        expect(image).beNil();
+    }
+}
+
+- (void)test32ThatISOHDRDecodeWorks {
+    // Only test for iOS 17+/macOS 14+/visionOS 1+, or ImageIO decoder does not support HDR
+#if SD_MAC || SD_IOS || SD_VISION
+    if (@available(macOS 14, iOS 17, tvOS 17, watchOS 10, *)) {
+        NSArray *formats = @[@"heic", @"avif", @"jxl"];
+        for (NSString *format in formats) {
+            NSURL *url = [[NSBundle bundleForClass:[self class]] URLForResource:@"TestHDR" withExtension:format];
+            NSData *data = [NSData dataWithContentsOfURL:url];
+            // Decoding
+            UIImage *HDRImage = [SDImageIOCoder.sharedCoder decodedImageWithData:data options:@{SDImageCoderDecodeToHDR : @(YES)}];
+            UIImage *SDRImage = [SDImageIOCoder.sharedCoder decodedImageWithData:data options:@{SDImageCoderDecodeToHDR : @(NO)}];
+            
+            expect(HDRImage).notTo.beNil();
+            expect(SDRImage).notTo.beNil();
+            
+            expect([SDImageCoderHelper CGImageIsHDR:HDRImage.CGImage]).beTruthy();
+            expect(HDRImage.sd_isHighDynamicRange).beTruthy();
+            // Current we lack of some HDR RGBA1010102
+            size_t HDRBPC = CGImageGetBitsPerComponent(HDRImage.CGImage);
+            expect(HDRBPC).beGreaterThan(8);
+            expect([HDRImage sd_colorAtPoint:CGPointMake(1, 1)]).beNil();
+            
+            // FIXME: on Simulator, the SDR decode options will not take effect, so SDR is the same as HDR
+#if !TARGET_OS_SIMULATOR
+            expect([SDImageCoderHelper CGImageIsHDR:SDRImage.CGImage]).beFalsy();
+            expect(SDRImage.sd_isHighDynamicRange).beFalsy();
+            size_t SDRBPC = CGImageGetBitsPerComponent(SDRImage.CGImage);
+            expect(SDRBPC).beLessThanOrEqualTo(8);
+            expect([SDRImage sd_colorAtPoint:CGPointMake(1, 1)]).notTo.beNil();
+#endif
+        }
+    }
+#endif
+}
+
+- (void)test33ThatGainMapHDRDecodeWorks {
+    // JPEG Gain Map HDR need iOS 18+
+    // GitHub Action virtualization framework contains issue for Gain Map HDR convert:
+    // [xctest] +[HDRImageConverter imageConverterWithOptions:]:40: ☀️ Failed to initialize Metal converter, falling back to SIMD for image conversion (slow)
+    if (SDTestCase.isCI) {
+        return;
+    }
+#if SD_MAC || SD_IOS || SD_VISION
+    if (@available(macOS 15, iOS 18, tvOS 18, watchOS 11, *)) {
+        NSArray *formats = @[@"jpeg"];
+        for (NSString *format in formats) {
+            NSURL *url = [[NSBundle bundleForClass:[self class]] URLForResource:@"TestHDR" withExtension:format];
+            NSData *data = [NSData dataWithContentsOfURL:url];
+            // Decoding
+            UIImage *HDRImage = [SDImageIOCoder.sharedCoder decodedImageWithData:data options:@{SDImageCoderDecodeToHDR : @(YES)}];
+            UIImage *SDRImage = [SDImageIOCoder.sharedCoder decodedImageWithData:data options:@{SDImageCoderDecodeToHDR : @(NO)}];
+            
+            expect(HDRImage).notTo.beNil();
+            expect(SDRImage).notTo.beNil();
+            
+            // Gain Map HDR does not use Rec. 2100 color space
+            size_t HDRBPC = CGImageGetBitsPerComponent(HDRImage.CGImage);
+            size_t SDRBPC = CGImageGetBitsPerComponent(SDRImage.CGImage);
+            expect(HDRBPC).beGreaterThan(8);
+            expect(SDRBPC).beLessThanOrEqualTo(8);
+//            expect([SDImageCoderHelper CGImageIsHDR:HDRImage.CGImage]).beTruthy();
+//            expect(HDRImage.sd_isHighDynamicRange).beTruthy();
+        }
+    }
+#endif
+}
+
+- (void)test34ThatHDREncodeWorks {
+    // FIXME: Encoding need iOS 18+/macOS 15+, No simulator
+    // GitHub Action virtualization framework contains issue for Gain Map HDR convert:
+    if (SDTestCase.isCI) {
+        return;
+    }
+    // Actually we test 4 cases, because decoded CGImage can contains gain map or not
+    // heic -> heic / heic -> jpeg / jpeg(gain map) -> heic / jpeg(gain map) -> jpeg
+    if (@available(macOS 15, iOS 18, tvOS 18, watchOS 11, *)) {
+        NSArray *decodeFormats = @[@"heic", @"jpeg"];
+        for (NSString *decodeFormat in decodeFormats) {
+            NSURL *url = [[NSBundle bundleForClass:[self class]] URLForResource:@"TestHDR" withExtension:decodeFormat];
+            NSData *data = [NSData dataWithContentsOfURL:url];
+            // Decoding
+            UIImage *HDRImage = [SDImageIOCoder.sharedCoder decodedImageWithData:data options:@{SDImageCoderDecodeToHDR : @(YES)}];
+            float headroom = CGImageGetContentHeadroom(HDRImage.CGImage);
+            expect(headroom).beGreaterThan(1);
+#if !TARGET_OS_SIMULATOR
+            NSArray *encodeFormats = @[@"heic", @"jpeg"];
+            for (NSString *encodeFormat in encodeFormats) {
+                NSLog(@"Testing HDR encodde from original : %@ to %@", decodeFormat, encodeFormat);
+                // HEIC with ISO Gain Map
+                SDImageFormat format = SDImageFormatHEIC;
+                if ([encodeFormat isEqualToString:@"jpeg"]) {
+                    // JPEG with XMP Gain Map
+                    format = SDImageFormatJPEG;
+                }
+                NSData *SDRData = [SDImageIOCoder.sharedCoder encodedDataWithImage:HDRImage format:format options:@{SDImageCoderEncodeToHDR : @(SDImageHDRTypeSDR)}];
+                NSData *HDRData = [SDImageIOCoder.sharedCoder encodedDataWithImage:HDRImage format:format options:@{SDImageCoderEncodeToHDR : @(SDImageHDRTypeISOHDR)}];
+                NSData *HDRGainMapData = [SDImageIOCoder.sharedCoder encodedDataWithImage:HDRImage format:format options:@{SDImageCoderEncodeToHDR : @(SDImageHDRTypeISOGainMap)}];
+                expect(SDRData).notTo.beNil();
+                expect(HDRData).notTo.beNil();
+                expect(HDRGainMapData).notTo.beNil();
+                // JPEG has no built-in support Gain Map, so it stored in XMP and be larger
+                if ([encodeFormat isEqualToString:@"jpeg"]) {
+                    expect(HDRGainMapData.length).beGreaterThan(HDRData.length);
+                }
+                
+                // Check gain map information
+                CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef)HDRGainMapData, NULL);
+                NSDictionary *gainMap = [self gainMapFromImageSource:source];
+                expect(gainMap.count).beGreaterThan(0);
+                // At least gain map contains `kCGImageAuxiliaryDataInfoMetadata`
+                CGImageMetadataRef meta = (__bridge CGImageMetadataRef)(gainMap[(__bridge NSString *)kCGImageAuxiliaryDataInfoMetadata]);
+                expect(meta).notTo.beNil();
+                
+                // A check for redecoded CGImage
+                CGImageRef redecodeSDRImage = CGImageSourceCreateImageAtIndex(source, 0, nil);
+                expect(redecodeSDRImage).notTo.beNil();
+                headroom = CGImageGetContentHeadroom(redecodeSDRImage);
+                expect(headroom).equal(1);
+                CFRelease(source);
+            }
+#endif
+        }
+    }
+}
+
+#pragma mark - Utils
+
+- (void)verifyCoder:(id<SDImageCoder>)coder
+withLocalImageURL:(NSURL *)imageUrl
+ supportsEncoding:(BOOL)supportsEncoding
+  isAnimatedImage:(BOOL)isAnimated {
+    [self verifyCoder:coder withLocalImageURL:imageUrl supportsEncoding:supportsEncoding encodingFormat:SDImageFormatUndefined isAnimatedImage:isAnimated isVectorImage:NO];
+}
+
+- (void)verifyCoder:(id<SDImageCoder>)coder
+  withLocalImageURL:(NSURL *)imageUrl
+   supportsEncoding:(BOOL)supportsEncoding
+     encodingFormat:(SDImageFormat)encodingFormat
+    isAnimatedImage:(BOOL)isAnimated
+      isVectorImage:(BOOL)isVector {
+    NSData *inputImageData = [NSData dataWithContentsOfURL:imageUrl];
+    expect(inputImageData).toNot.beNil();
+    SDImageFormat inputImageFormat = [NSData sd_imageFormatForImageData:inputImageData];
+    expect(inputImageFormat).toNot.equal(SDImageFormatUndefined);
+    
+    // 1 - check if we can decode - should be true
+    expect([coder canDecodeFromData:inputImageData]).to.beTruthy();
+    
+    // 2 - decode from NSData to UIImage and check it
+    UIImage *inputImage = [coder decodedImageWithData:inputImageData options:nil];
+    expect(inputImage).toNot.beNil();
+    
+    if (isAnimated) {
+        // 2a - check images count > 0 (only for animated images)
+        expect(inputImage.sd_isAnimated).to.beTruthy();
+        
+        // 2b - check image size and scale for each frameImage (only for animated images)
+#if SD_UIKIT
+        CGSize imageSize = inputImage.size;
+        CGFloat imageScale = inputImage.scale;
+        [inputImage.images enumerateObjectsUsingBlock:^(UIImage * frameImage, NSUInteger idx, BOOL * stop) {
+            expect(imageSize).to.equal(frameImage.size);
+            expect(imageScale).to.equal(frameImage.scale);
+        }];
+#endif
+    }
+    
+    // 3 - check thumbnail decoding
+    CGFloat pixelWidth = inputImage.size.width;
+    CGFloat pixelHeight = inputImage.size.height;
+    expect(pixelWidth).beGreaterThan(0);
+    expect(pixelHeight).beGreaterThan(0);
+    // check vector format should use 72 DPI
+    if (isVector) {
+        CGRect boxRect = [self boxRectFromPDFData:inputImageData];
+        expect(boxRect.size.width).beGreaterThan(0);
+        expect(boxRect.size.height).beGreaterThan(0);
+        // Since 72 DPI is 1:1 from inch size to pixel size
+        expect(boxRect.size.width).equal(pixelWidth);
+        expect(boxRect.size.height).equal(pixelHeight);
+    }
+    
+    // check thumbnail with scratch
+    CGFloat thumbnailWidth = 50;
+    CGFloat thumbnailHeight = 50;
+    UIImage *thumbImage = [coder decodedImageWithData:inputImageData options:@{
+        SDImageCoderDecodeThumbnailPixelSize : @(CGSizeMake(thumbnailWidth, thumbnailHeight)),
+        SDImageCoderDecodePreserveAspectRatio : @(NO)
+    }];
+    expect(thumbImage).toNot.beNil();
+    expect(thumbImage.size).equal(CGSizeMake(thumbnailWidth, thumbnailHeight));
+    // check thumbnail with aspect ratio limit
+    thumbImage = [coder decodedImageWithData:inputImageData options:@{
+        SDImageCoderDecodeThumbnailPixelSize : @(CGSizeMake(thumbnailWidth, thumbnailHeight)),
+        SDImageCoderDecodePreserveAspectRatio : @(YES)
+    }];
+    expect(thumbImage).toNot.beNil();
+    CGFloat ratio = pixelWidth / pixelHeight;
+    CGFloat thumbnailRatio = thumbnailWidth / thumbnailHeight;
+    CGSize thumbnailPixelSize;
+    if (ratio > thumbnailRatio) {
+        thumbnailPixelSize = CGSizeMake(thumbnailWidth, round(thumbnailWidth / ratio));
+    } else {
+        thumbnailPixelSize = CGSizeMake(round(thumbnailHeight * ratio), thumbnailHeight);
+    }
+    // Image/IO's thumbnail API does not always use round to preserve precision, we check ABS <= 1
+    expect(ABS(thumbImage.size.width - thumbnailPixelSize.width)).beLessThanOrEqualTo(1);
+    expect(ABS(thumbImage.size.height - thumbnailPixelSize.height)).beLessThanOrEqualTo(1);
+    
+    
+    if (supportsEncoding) {
+        // 4 - check if we can encode to the original format
+        if (encodingFormat == SDImageFormatUndefined) {
+            encodingFormat = inputImageFormat;
+        }
+        expect([coder canEncodeToFormat:encodingFormat]).to.beTruthy();
+        
+        // 5 - encode from UIImage to NSData using the inputImageFormat and check it
+        NSData *outputImageData = [coder encodedDataWithImage:inputImage format:encodingFormat options:nil];
+        expect(outputImageData).toNot.beNil();
+        UIImage *outputImage = [coder decodedImageWithData:outputImageData options:nil];
+        expect(outputImage.size).to.equal(inputImage.size);
+        expect(outputImage.scale).to.equal(inputImage.scale);
+        expect(outputImage.sd_imageLoopCount).to.equal(inputImage.sd_imageLoopCount);
+        
+        // check max pixel size encoding with scratch
+        CGFloat maxWidth = 50;
+        CGFloat maxHeight = 50;
+        CGFloat maxRatio = maxWidth / maxHeight;
+        CGSize maxPixelSize;
+        if (ratio > maxRatio) {
+            maxPixelSize = CGSizeMake(maxWidth, round(maxWidth / ratio));
+        } else {
+            maxPixelSize = CGSizeMake(round(maxHeight * ratio), maxHeight);
+        }
+        NSData *outputMaxImageData = [coder encodedDataWithImage:inputImage format:encodingFormat options:@{SDImageCoderEncodeMaxPixelSize : @(CGSizeMake(maxWidth, maxHeight))}];
+        UIImage *outputMaxImage = [coder decodedImageWithData:outputMaxImageData options:nil];
+        // Image/IO's thumbnail API does not always use round to preserve precision, we check ABS <= 1
+        expect(ABS(outputMaxImage.size.width - maxPixelSize.width)).beLessThanOrEqualTo(1);
+        expect(ABS(outputMaxImage.size.height - maxPixelSize.height)).beLessThanOrEqualTo(1);
+        expect(outputMaxImage.sd_imageLoopCount).to.equal(inputImage.sd_imageLoopCount);
+    }
+}
+
+- (NSArray *)thumbnailImagesFromImageSource:(CGImageSourceRef)source API_AVAILABLE(ios(11.0), tvos(11.0), macos(10.13)) {
+    NSDictionary *properties = (__bridge_transfer NSDictionary *)CGImageSourceCopyProperties(source, nil);
+    NSDictionary *fileProperties = properties[(__bridge NSString *)kCGImagePropertyFileContentsDictionary];
+    NSArray *imagesProperties = fileProperties[(__bridge NSString *)kCGImagePropertyImages];
+    NSDictionary *imageProperties = imagesProperties.firstObject;
+    NSArray *thumbnailImages = imageProperties[(__bridge NSString *)kCGImagePropertyThumbnailImages];
+    
+    return thumbnailImages;
+}
+
+- (NSDictionary *)gainMapFromImageSource:(CGImageSourceRef)source {
+    if (@available(macOS 15, iOS 18, tvOS 18, watchOS 11, *)) {
+        CFDictionaryRef ISOGainMap = CGImageSourceCopyAuxiliaryDataInfoAtIndex(source, 0, kCGImageAuxiliaryDataTypeISOGainMap);
+        if (ISOGainMap) {
+            return (__bridge_transfer NSDictionary *)ISOGainMap;
+        }
+        CFDictionaryRef HDRGainMap = CGImageSourceCopyAuxiliaryDataInfoAtIndex(source, 0, kCGImageAuxiliaryDataTypeHDRGainMap);
+        if (HDRGainMap) {
+            return (__bridge_transfer NSDictionary *)HDRGainMap;
+        }
+        return nil;
+    }
+    return nil;
+}
+
+#pragma mark - Utils
+- (CGRect)boxRectFromPDFData:(nonnull NSData *)data {
+    CGDataProviderRef provider = CGDataProviderCreateWithCFData((__bridge CFDataRef)data);
+    if (!provider) {
+        return CGRectZero;
+    }
+    CGPDFDocumentRef document = CGPDFDocumentCreateWithProvider(provider);
+    CGDataProviderRelease(provider);
+    if (!document) {
+        return CGRectZero;
+    }
+    
+    // `CGPDFDocumentGetPage` page number is 1-indexed.
+    CGPDFPageRef page = CGPDFDocumentGetPage(document, 1);
+    if (!page) {
+        CGPDFDocumentRelease(document);
+        return CGRectZero;
+    }
+    
+    CGRect boxRect = CGPDFPageGetBoxRect(page, kCGPDFMediaBox);
+    CGPDFDocumentRelease(document);
+    
+    return boxRect;
+}
+
+@end
diff --git a/Tests/Tests/SDImageTransformerTests.m b/Tests/Tests/SDImageTransformerTests.m
new file mode 100644
index 000000000..550a854bb
--- /dev/null
+++ b/Tests/Tests/SDImageTransformerTests.m
@@ -0,0 +1,729 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ * (c) Matt Galloway
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDTestCase.h"
+#import "UIColor+SDHexString.h"
+#import <CoreImage/CoreImage.h>
+
+static void SDAssertCGImagePixelFormatEqual(CGImageRef image1, CGImageRef image2) {
+    CGBitmapInfo bitmapInfo1 = CGImageGetBitmapInfo(image1);
+    CGBitmapInfo bitmapInfo2 = CGImageGetBitmapInfo(image2);
+//    XCTAssertEqual(bitmapInfo1, bitmapInfo2);
+    CGImageAlphaInfo alphaInfo1 = bitmapInfo1 & kCGBitmapAlphaInfoMask;
+    CGImageAlphaInfo alphaInfo2 = bitmapInfo2 & kCGBitmapAlphaInfoMask;
+    XCTAssertEqual(alphaInfo1, alphaInfo2);
+    CGImageByteOrderInfo byteOrderInfo1 = bitmapInfo1 & kCGBitmapByteOrderMask;
+    CGImageByteOrderInfo byteOrderInfo2 = bitmapInfo2 & kCGBitmapByteOrderMask;
+    // Note: Known issue that iOS 17.0~17.2 contains BUG that vImage convert CGImage does not keep byteOrder for 16bit
+    // The Buggy API is: `vImageCreateCGImageFromBuffer`, the `format`'s bitmap info will be ignored.
+    if (byteOrderInfo1 != byteOrderInfo2) {
+        NSLog(@"SDAssertCGImagePixelFormatEqual: mismatched byte order info, maybe Apple's Bug on iOS 17.0-17.2");
+    }
+    if (@available(iOS 12.0, tvOS 12.0, macOS 10.14, watchOS 5.0, *)) {
+        XCTAssertEqual(CGImageGetPixelFormatInfo(image1), CGImageGetPixelFormatInfo(image2));
+    }
+    XCTAssertEqual(CGImageGetColorSpace(image1), CGImageGetColorSpace(image2));
+    XCTAssertEqual(CGImageGetBitsPerPixel(image1), CGImageGetBitsPerPixel(image2));
+    XCTAssertEqual(CGImageGetBitsPerComponent(image1), CGImageGetBitsPerComponent(image2));
+    XCTAssertEqual(CGImageGetRenderingIntent(image1), CGImageGetRenderingIntent(image2));
+    XCTAssertEqual(CGImageGetShouldInterpolate(image1), CGImageGetShouldInterpolate(image2));
+}
+
+// TODO: Current sd_colorAtPoint: support 8-bits only, 16bits and float color will fail...
+// So I write this `SDAssertCGImageFirstComponentWhite` :(
+static void SDAssertCGImageFirstComponentWhite(CGImageRef image, OSType pixelType) {
+    CGDataProviderRef provider = CGImageGetDataProvider(image);
+    CFDataRef data = CGDataProviderCopyData(provider);
+    if (pixelType == kCVPixelFormatType_128RGBAFloat) {
+        float *buffer = (float *)CFDataGetBytePtr(data);
+        float r = buffer[0];
+        float g = buffer[1];
+        float b = buffer[2];
+        float a = buffer[3];
+        XCTAssertEqual(r, 1.0);
+        XCTAssertEqual(g, 1.0);
+        XCTAssertEqual(b, 1.0);
+        XCTAssertEqual(a, 1.0);
+    } else if (pixelType == kCVPixelFormatType_64RGBALE) {
+        uint16_t *buffer = (uint16_t *)CFDataGetBytePtr(data);
+        uint16_t r = buffer[0];
+        uint16_t g = buffer[1];
+        uint16_t b = buffer[2];
+        uint16_t a = buffer[3];
+        XCTAssertEqual(r, UINT16_MAX);
+        XCTAssertEqual(g, UINT16_MAX);
+        XCTAssertEqual(b, UINT16_MAX);
+        XCTAssertEqual(a, UINT16_MAX);
+    } else if (pixelType == kCVPixelFormatType_32ARGB) {
+        uint8_t *buffer = (uint8_t *)CFDataGetBytePtr(data);
+        uint8_t a = buffer[0];
+        uint8_t r = buffer[1];
+        uint8_t g = buffer[2];
+        uint8_t b = buffer[3];
+        XCTAssertEqual(a, UINT8_MAX);
+        XCTAssertEqual(r, UINT8_MAX);
+        XCTAssertEqual(g, UINT8_MAX);
+        XCTAssertEqual(b, UINT8_MAX);
+    } else if (pixelType == kCVPixelFormatType_24RGB) {
+        uint8_t *buffer = (uint8_t *)CFDataGetBytePtr(data);
+        uint8_t r = buffer[0];
+        uint8_t g = buffer[1];
+        uint8_t b = buffer[2];
+        XCTAssertEqual(r, UINT8_MAX);
+        XCTAssertEqual(g, UINT8_MAX);
+        XCTAssertEqual(b, UINT8_MAX);
+    } else if (pixelType == kCVPixelFormatType_48RGB) {
+        uint16_t *buffer = (uint16_t *)CFDataGetBytePtr(data);
+        uint16_t r = buffer[0];
+        uint16_t g = buffer[1];
+        uint16_t b = buffer[2];
+        XCTAssertEqual(r, UINT16_MAX);
+        XCTAssertEqual(g, UINT16_MAX);
+        XCTAssertEqual(b, UINT16_MAX);
+    } else {
+        XCTFail(@"Should not hit here");
+    }
+    CFRelease(data);
+}
+
+@interface SDImageTransformerTests : SDTestCase
+
+@property (nonatomic, strong) UIImage *testImageCG;
+@property (nonatomic, strong) UIImage *testImageCI;
+
+@end
+
+@implementation SDImageTransformerTests
+
+#pragma mark - UIImage+Transform
+
+// UIImage+Transform test is hard to write because it's more about visual effect. Current it's tied to the `TestImage.png`, please keep that image or write new test with new image
+- (void)test01UIImageTransformResizeCG {
+    [self test01UIImageTransformResizeWithImage:self.testImageCG];
+}
+
+- (void)test01UIImageTransformResizeCI {
+    [self test01UIImageTransformResizeWithImage:self.testImageCI];
+}
+
+- (void)test01UIImageTransformResizeWithImage:(UIImage *)testImage {
+    CGSize scaleDownSize = CGSizeMake(200, 100);
+    UIImage *scaledDownImage = [testImage sd_resizedImageWithSize:scaleDownSize scaleMode:SDImageScaleModeFill];
+    expect(CGSizeEqualToSize(scaledDownImage.size, scaleDownSize)).beTruthy();
+    CGSize scaleUpSize = CGSizeMake(2000, 1000);
+    UIImage *scaledUpImage = [testImage sd_resizedImageWithSize:scaleUpSize scaleMode:SDImageScaleModeAspectFit];
+    expect(CGSizeEqualToSize(scaledUpImage.size, scaleUpSize)).beTruthy();
+    // Check image not inversion
+    UIColor *topCenterColor = [scaledUpImage sd_colorAtPoint:CGPointMake(1000, 50)];
+    expect([topCenterColor.sd_hexString isEqualToString:[UIColor blackColor].sd_hexString]).beTruthy();
+}
+
+- (void)test02UIImageTransformCropCG {
+    [self test02UIImageTransformCropWithImage:self.testImageCG];
+}
+
+- (void)test02UIImageTransformCropCI {
+    [self test02UIImageTransformCropWithImage:self.testImageCI];
+}
+
+- (void)test02UIImageTransformCropWithImage:(UIImage *)testImage {
+    CGRect rect = CGRectMake(50, 10, 200, 200);
+    UIImage *croppedImage = [testImage sd_croppedImageWithRect:rect];
+    expect(CGSizeEqualToSize(croppedImage.size, CGSizeMake(200, 200))).beTruthy();
+    UIColor *startColor = [croppedImage sd_colorAtPoint:CGPointZero];
+    expect([startColor.sd_hexString isEqualToString:[UIColor clearColor].sd_hexString]).beTruthy();
+    // Check image not inversion
+    UIColor *topCenterColor = [croppedImage sd_colorAtPoint:CGPointMake(100, 10)];
+    expect([topCenterColor.sd_hexString isEqualToString:[UIColor blackColor].sd_hexString]).beTruthy();
+}
+
+- (void)test03UIImageTransformRoundedCornerCG {
+    [self test03UIImageTransformRoundedCornerWithImage:self.testImageCG];
+}
+
+- (void)test03UIImageTransformRoundedCornerCI {
+    [self test03UIImageTransformRoundedCornerWithImage:self.testImageCI];
+}
+
+- (void)test03UIImageTransformRoundedCornerWithImage:(UIImage *)testImage {
+    CGFloat radius = 50;
+#if SD_UIKIT
+    SDRectCorner corners = UIRectCornerAllCorners;
+#else
+    SDRectCorner corners = SDRectCornerAllCorners;
+#endif
+    CGFloat borderWidth = 1;
+    UIColor *borderColor = [UIColor blackColor];
+    UIImage *roundedCornerImage = [testImage sd_roundedCornerImageWithRadius:radius corners:corners borderWidth:borderWidth borderColor:borderColor];
+    expect(CGSizeEqualToSize(roundedCornerImage.size, CGSizeMake(300, 300))).beTruthy();
+    UIColor *startColor = [roundedCornerImage sd_colorAtPoint:CGPointZero];
+    expect([startColor.sd_hexString isEqualToString:[UIColor clearColor].sd_hexString]).beTruthy();
+    // Check the left center pixel, should be border :)
+    UIColor *checkBorderColor = [roundedCornerImage sd_colorAtPoint:CGPointMake(1, 150)];
+    expect([checkBorderColor.sd_hexString isEqualToString:borderColor.sd_hexString]).beTruthy();
+    // Check rounded corner operation not inversion the image
+    UIColor *topCenterColor = [roundedCornerImage sd_colorAtPoint:CGPointMake(150, 20)];
+    expect([topCenterColor.sd_hexString isEqualToString:[UIColor blackColor].sd_hexString]).beTruthy();
+}
+
+- (void)test04UIImageTransformRotateCG {
+    [self test04UIImageTransformRotateWithImage:self.testImageCG];
+}
+
+- (void)test04UIImageTransformRotateCI {
+    [self test04UIImageTransformRotateWithImage:self.testImageCI];
+}
+
+- (void)test04UIImageTransformRotateWithImage:(UIImage *)testImage {
+    CGFloat angle = M_PI_4;
+    UIImage *rotatedImage = [testImage sd_rotatedImageWithAngle:angle fitSize:NO];
+    // Not fit size and no change
+    expect(CGSizeEqualToSize(rotatedImage.size, testImage.size)).beTruthy();
+    // Fit size, may change size
+    rotatedImage = [testImage sd_rotatedImageWithAngle:angle fitSize:YES];
+    CGSize rotatedSize = CGSizeMake(ceil(300 * 1.414), ceil(300 * 1.414)); // 45º, square length * sqrt(2)
+    expect(rotatedImage.size.width - rotatedSize.width <= 1).beTruthy();
+    expect(rotatedImage.size.height - rotatedSize.height <= 1).beTruthy();
+    // Check image not inversion
+    UIColor *leftCenterColor = [rotatedImage sd_colorAtPoint:CGPointMake(60, 175)];
+    expect([leftCenterColor.sd_hexString isEqualToString:[UIColor blackColor].sd_hexString]).beTruthy();
+}
+
+- (void)test05UIImageTransformFlipCG {
+    [self test05UIImageTransformFlipWithImage:self.testImageCG];
+}
+
+- (void)test05UIImageTransformFlipCI {
+    [self test05UIImageTransformFlipWithImage:self.testImageCI];
+}
+
+- (void)test05UIImageTransformFlipWithImage:(UIImage *)testImage {
+    BOOL horizontal = YES;
+    BOOL vertical = YES;
+    UIImage *flippedImage = [testImage sd_flippedImageWithHorizontal:horizontal vertical:vertical];
+    expect(CGSizeEqualToSize(flippedImage.size, testImage.size)).beTruthy();
+    // Test pixel colors method here
+    UIColor *checkColor = [flippedImage sd_colorAtPoint:CGPointMake(75, 75)];
+    expect(checkColor);
+    NSArray<UIColor *> *checkColors = [flippedImage sd_colorsWithRect:CGRectMake(75, 75, 10, 10)]; // Rect are all same color
+    expect(checkColors.count).to.equal(10 * 10);
+    for (UIColor *color in checkColors) {
+        expect([color isEqual:checkColor]).to.beTruthy();
+    }
+    // Check image not inversion
+    UIColor *bottomCenterColor = [flippedImage sd_colorAtPoint:CGPointMake(150, 285)];
+    expect([bottomCenterColor.sd_hexString isEqualToString:[UIColor blackColor].sd_hexString]).beTruthy();
+}
+
+- (void)test06UIImageTransformTintCG {
+    [self test06UIImageTransformTintWithImage:self.testImageCG];
+}
+
+- (void)test06UIImageTransformTintCI {
+    [self test06UIImageTransformTintWithImage:self.testImageCI];
+}
+
+- (void)test06UIImageTransformTintWithImage:(UIImage *)testImage {
+    UIColor *tintColor = [UIColor blackColor];
+    UIImage *tintedImage = [testImage sd_tintedImageWithColor:tintColor];
+    expect(CGSizeEqualToSize(tintedImage.size, testImage.size)).beTruthy();
+    // Check center color, should keep clear
+    UIColor *centerColor = [tintedImage sd_colorAtPoint:CGPointMake(150, 150)];
+    expect([centerColor.sd_hexString isEqualToString:[UIColor clearColor].sd_hexString]).beTruthy();
+    // Check left color, should be tinted
+    UIColor *leftColor = [tintedImage sd_colorAtPoint:CGPointMake(80, 150)];
+    expect([leftColor.sd_hexString isEqualToString:tintColor.sd_hexString]).beTruthy();
+    // Check rounded corner operation not inversion the image
+    UIColor *topCenterColor = [tintedImage sd_colorAtPoint:CGPointMake(150, 20)];
+    expect([topCenterColor.sd_hexString isEqualToString:[UIColor blackColor].sd_hexString]).beTruthy();
+    
+    UIImage *tintedSourceInImage = [testImage sd_tintedImageWithColor:tintColor blendMode:kCGBlendModeSourceIn];
+    topCenterColor = [tintedSourceInImage sd_colorAtPoint:CGPointMake(150, 20)];
+#if SD_UIKIT
+    // Test UIKit's tint color behavior
+    if (@available(iOS 13.0, tvOS 13.0, watchOS 6.0, *)) {
+        UIImage *tintedSystemImage = [testImage imageWithTintColor:tintColor renderingMode:UIImageRenderingModeAlwaysTemplate];
+        UIGraphicsImageRendererFormat *format = UIGraphicsImageRendererFormat.preferredFormat;
+        format.scale = tintedSourceInImage.scale;
+        UIGraphicsImageRenderer *renderer = [[UIGraphicsImageRenderer alloc] initWithSize:tintedSystemImage.size format:format];
+        // Draw template image
+        tintedSystemImage = [renderer imageWithActions:^(UIGraphicsImageRendererContext * _Nonnull rendererContext) {
+                [tintedSystemImage drawInRect:CGRectMake(0, 0, tintedSystemImage.size.width, tintedSystemImage.size.height)];
+        }];
+        UIColor *testColor1 = [tintedSourceInImage sd_colorAtPoint:CGPointMake(150, 20)];
+        UIColor *testColor2 = [tintedSystemImage sd_colorAtPoint:CGPointMake(150, 20)];
+        CGFloat r1, g1, b1, a1;
+        CGFloat r2, g2, b2, a2;
+        [testColor1 getRed:&r1 green:&g1 blue:&b1 alpha:&a1];
+        [testColor2 getRed:&r2 green:&g2 blue:&b2 alpha:&a2];
+        expect(r1).beCloseToWithin(r2, 0.01);
+        expect(g1).beCloseToWithin(g2, 0.01);
+        expect(b1).beCloseToWithin(b2, 0.01);
+        expect(a1).beCloseToWithin(a2, 0.01);
+    }
+#endif
+    expect([topCenterColor.sd_hexString isEqualToString:tintColor.sd_hexString]).beTruthy();
+}
+#pragma clang diagnostic pop
+
+- (void)test07UIImageTransformBlurCG {
+    [self test07UIImageTransformBlurWithImage:self.testImageCG];
+}
+
+- (void)test07UIImageTransformBlurCI {
+    [self test07UIImageTransformBlurWithImage:self.testImageCI];
+}
+
+- (void)test07UIImageTransformBlurWithImage:(UIImage *)testImage {
+    CGFloat radius = 25;
+    UIImage *blurredImage = [testImage sd_blurredImageWithRadius:radius];
+    expect(CGSizeEqualToSize(blurredImage.size, testImage.size)).beTruthy();
+    // Check left color, should be blurred
+    UIColor *leftColor = [blurredImage sd_colorAtPoint:CGPointMake(80, 150)];
+    // Hard-code from the output, allows a little deviation because of blur diffs between OS versions :)
+    UIColor *expectedColor = [UIColor colorWithRed:0.59 green:0.14 blue:0.12 alpha:0.75];
+    CGFloat r1, g1, b1, a1;
+    CGFloat r2, g2, b2, a2;
+    [leftColor getRed:&r1 green:&g1 blue:&b1 alpha:&a1];
+    [expectedColor getRed:&r2 green:&g2 blue:&b2 alpha:&a2];
+    expect(r1).beCloseToWithin(r2, 0.01);
+    expect(g1).beCloseToWithin(g2, 0.01);
+    expect(b1).beCloseToWithin(b2, 0.01);
+    expect(a1).beCloseToWithin(a2, 0.01);
+    // Check rounded corner operation not inversion the image
+    UIColor *topCenterColor = [blurredImage sd_colorAtPoint:CGPointMake(150, 20)];
+    UIColor *bottomCenterColor = [blurredImage sd_colorAtPoint:CGPointMake(150, 280)];
+    expect([topCenterColor.sd_hexString isEqualToString:bottomCenterColor.sd_hexString]).beFalsy();
+}
+
+- (void)test08UIImageTransformFilterCG {
+    [self test08UIImageTransformFilterWithImage:self.testImageCG];
+}
+
+- (void)test08UIImageTransformFilterCI {
+    [self test08UIImageTransformFilterWithImage:self.testImageCI];
+}
+
+- (void)test08UIImageTransformFilterWithImage:(UIImage *)testImage {
+    // Invert color filter
+    CIFilter *filter = [CIFilter filterWithName:@"CIColorInvert"];
+    UIImage *filteredImage = [testImage sd_filteredImageWithFilter:filter];
+    expect(CGSizeEqualToSize(filteredImage.size, testImage.size)).beTruthy();
+    // Check left color, should be inverted
+    UIColor *leftColor = [filteredImage sd_colorAtPoint:CGPointMake(80, 150)];
+    // Hard-code from the output
+    UIColor *expectedColor = [UIColor colorWithRed:0.85098 green:0.992157 blue:0.992157 alpha:1];
+    CGFloat r1, g1, b1, a1;
+    CGFloat r2, g2, b2, a2;
+    [leftColor getRed:&r1 green:&g1 blue:&b1 alpha:&a1];
+    [expectedColor getRed:&r2 green:&g2 blue:&b2 alpha:&a2];
+    expect(r1).beCloseToWithin(r2, 0.01);
+    expect(g1).beCloseToWithin(g2, 0.01);
+    expect(b1).beCloseToWithin(b2, 0.01);
+    expect(a1).beCloseToWithin(a2, 0.01);
+    // Check rounded corner operation not inversion the image
+    UIColor *topCenterColor = [filteredImage sd_colorAtPoint:CGPointMake(150, 20)];
+    expect([topCenterColor.sd_hexString isEqualToString:[UIColor whiteColor].sd_hexString]).beTruthy();
+}
+
+#pragma mark - SDImageTransformer
+
+- (void)test09ImagePipelineTransformer {
+    CGSize size = CGSizeMake(100, 100);
+    SDImageScaleMode scaleMode = SDImageScaleModeAspectFill;
+    CGFloat angle = M_PI_4;
+    BOOL fitSize = NO;
+    CGFloat radius = 50;
+#if SD_UIKIT
+    SDRectCorner corners = UIRectCornerAllCorners;
+#else
+    SDRectCorner corners = SDRectCornerAllCorners;
+#endif
+    CGFloat borderWidth = 1;
+    UIColor *borderCoder = [UIColor blackColor];
+    BOOL horizontal = YES;
+    BOOL vertical = YES;
+    CGRect cropRect = CGRectMake(0, 0, 50, 50);
+    UIColor *tintColor = [UIColor clearColor];
+    CGFloat blurRadius = 5;
+    
+    SDImageResizingTransformer *transformer1 = [SDImageResizingTransformer transformerWithSize:size scaleMode:scaleMode];
+    SDImageRotationTransformer *transformer2 = [SDImageRotationTransformer transformerWithAngle:angle fitSize:fitSize];
+    SDImageRoundCornerTransformer *transformer3 = [SDImageRoundCornerTransformer transformerWithRadius:radius corners:corners borderWidth:borderWidth borderColor:borderCoder];
+    SDImageFlippingTransformer *transformer4 = [SDImageFlippingTransformer transformerWithHorizontal:horizontal vertical:vertical];
+    SDImageCroppingTransformer *transformer5 = [SDImageCroppingTransformer transformerWithRect:cropRect];
+    SDImageTintTransformer *transformer6 = [SDImageTintTransformer transformerWithColor:tintColor];
+    SDImageBlurTransformer *transformer7 = [SDImageBlurTransformer transformerWithRadius:blurRadius];
+    
+    CIFilter *filter = [CIFilter filterWithName:@"CIColorInvert"];
+    SDImageFilterTransformer *transformer8 = [SDImageFilterTransformer transformerWithFilter:filter];
+    
+    // Chain all built-in transformers for test case
+    SDImagePipelineTransformer *pipelineTransformer = [SDImagePipelineTransformer transformerWithTransformers:@[
+                                                                                                                transformer1,
+                                                                                                                transformer2,
+                                                                                                                transformer3,
+                                                                                                                transformer4,
+                                                                                                                transformer5,
+                                                                                                                transformer6,
+                                                                                                                transformer7,
+                                                                                                                transformer8
+                                                                                                                ]];
+    NSArray *transformerKeys = @[
+                      @"SDImageResizingTransformer({100.000000,100.000000},2)",
+                      @"SDImageRotationTransformer(0.785398,0)",
+                      @"SDImageRoundCornerTransformer(50.000000,18446744073709551615,1.000000,#ff000000)",
+                      @"SDImageFlippingTransformer(1,1)",
+                      @"SDImageCroppingTransformer({0.000000,0.000000,50.000000,50.000000})",
+                      @"SDImageTintTransformer(#00000000,18)",
+                      @"SDImageBlurTransformer(5.000000)",
+                      @"SDImageFilterTransformer(CIColorInvert)"
+                      ];
+    NSString *transformerKey = [transformerKeys componentsJoinedByString:@"-"]; // SDImageTransformerKeySeparator
+    expect([pipelineTransformer.transformerKey isEqualToString:transformerKey]).beTruthy();
+    
+    UIImage *transformedImage = [pipelineTransformer transformedImageWithImage:self.testImageCG forKey:@"Test"];
+    expect(transformedImage).notTo.beNil();
+    expect(CGSizeEqualToSize(transformedImage.size, cropRect.size)).beTruthy();
+}
+
+- (void)test10TransformerKeyForCacheKey {
+    NSString *transformerKey = @"SDImageFlippingTransformer(1,0)";
+    
+    // File path representation test cases
+    NSString *key = @"image.png";
+    expect(SDTransformedKeyForKey(key, transformerKey)).equal(@"image-SDImageFlippingTransformer(1,0).png");
+    
+    key = @"image";
+    expect(SDTransformedKeyForKey(key, transformerKey)).equal(@"image-SDImageFlippingTransformer(1,0)");
+    
+    key = @".image";
+    expect(SDTransformedKeyForKey(key, transformerKey)).equal(@".image-SDImageFlippingTransformer(1,0)");
+    
+    key = @"image.";
+    expect(SDTransformedKeyForKey(key, transformerKey)).equal(@"image.-SDImageFlippingTransformer(1,0)");
+    
+    key = @"Test/image.png";
+    expect(SDTransformedKeyForKey(key, transformerKey)).equal(@"Test/image-SDImageFlippingTransformer(1,0).png");
+    
+    // URL representation test cases
+    key = @"http://foo/image.png";
+    expect(SDTransformedKeyForKey(key, transformerKey)).equal(@"http://foo/image-SDImageFlippingTransformer(1,0).png");
+    
+    key = @"http://foo/image";
+    expect(SDTransformedKeyForKey(key, transformerKey)).equal(@"http://foo/image-SDImageFlippingTransformer(1,0)");
+    
+    key = @"http://foo/.image";
+    expect(SDTransformedKeyForKey(key, transformerKey)).equal(@"http://foo/.image-SDImageFlippingTransformer(1,0)");
+    
+    key = @"http://foo/image.png?foo=bar#mark";
+    expect(SDTransformedKeyForKey(key, transformerKey)).equal(@"http://foo/image-SDImageFlippingTransformer(1,0).png?foo=bar#mark");
+    
+    key = @"ftp://root:password@foo.com/image.png";
+    expect(SDTransformedKeyForKey(key, transformerKey)).equal(@"ftp://root:password@foo.com/image-SDImageFlippingTransformer(1,0).png");
+}
+
+#pragma mark - Coder Helper
+
+- (void)test20CGImageCreateDecodedWithOrientation {
+    // Test EXIF orientation tag, you can open this image with `Preview.app`, open inspector (Command+I) and rotate (Command+L/R) to check
+    UIImage *image = [[UIImage alloc] initWithContentsOfFile:[self testPNGPathForName:@"TestEXIF"]];
+    CGImageRef originalCGImage = image.CGImage;
+    expect(image).notTo.beNil();
+    
+    // Check the longest side of "F" point color
+    UIColor *pointColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:1];
+    
+    CGImageRef upCGImage = [SDImageCoderHelper CGImageCreateDecoded:originalCGImage orientation:kCGImagePropertyOrientationUp];
+#if SD_UIKIT
+    UIImage *upImage = [[UIImage alloc] initWithCGImage:upCGImage];
+#else
+    UIImage *upImage = [[UIImage alloc] initWithCGImage:upCGImage size:NSZeroSize];
+#endif
+    expect([[upImage sd_colorAtPoint:CGPointMake(40, 160)].sd_hexString isEqualToString:pointColor.sd_hexString]).beTruthy();
+    expect(upImage.size).equal(CGSizeMake(150, 200));
+    CGImageRelease(upCGImage);
+    
+    CGImageRef upMirroredCGImage = [SDImageCoderHelper CGImageCreateDecoded:originalCGImage orientation:kCGImagePropertyOrientationUpMirrored];
+#if SD_UIKIT
+    UIImage *upMirroredImage = [[UIImage alloc] initWithCGImage:upMirroredCGImage];
+#else
+    UIImage *upMirroredImage = [[UIImage alloc] initWithCGImage:upMirroredCGImage size:NSZeroSize];
+#endif
+    expect([[upMirroredImage sd_colorAtPoint:CGPointMake(110, 160)].sd_hexString isEqualToString:pointColor.sd_hexString]).beTruthy();
+    expect(upMirroredImage.size).equal(CGSizeMake(150, 200));
+    CGImageRelease(upMirroredCGImage);
+    
+    CGImageRef downCGImage = [SDImageCoderHelper CGImageCreateDecoded:originalCGImage orientation:kCGImagePropertyOrientationDown];
+#if SD_UIKIT
+    UIImage *downImage = [[UIImage alloc] initWithCGImage:downCGImage];
+#else
+    UIImage *downImage = [[UIImage alloc] initWithCGImage:downCGImage size:NSZeroSize];
+#endif
+    expect([[downImage sd_colorAtPoint:CGPointMake(110, 30)].sd_hexString isEqualToString:pointColor.sd_hexString]).beTruthy();
+    expect(downImage.size).equal(CGSizeMake(150, 200));
+    CGImageRelease(downCGImage);
+    
+    CGImageRef downMirrorerdCGImage = [SDImageCoderHelper CGImageCreateDecoded:originalCGImage orientation:kCGImagePropertyOrientationDownMirrored];
+#if SD_UIKIT
+    UIImage *downMirroredImage = [[UIImage alloc] initWithCGImage:downMirrorerdCGImage];
+#else
+    UIImage *downMirroredImage = [[UIImage alloc] initWithCGImage:downMirrorerdCGImage size:NSZeroSize];
+#endif
+    expect([[downMirroredImage sd_colorAtPoint:CGPointMake(40, 30)].sd_hexString isEqualToString:pointColor.sd_hexString]).beTruthy();
+    expect(downMirroredImage.size).equal(CGSizeMake(150, 200));
+    CGImageRelease(downMirrorerdCGImage);
+    
+    CGImageRef leftMirroredCGImage = [SDImageCoderHelper CGImageCreateDecoded:originalCGImage orientation:kCGImagePropertyOrientationLeftMirrored];
+#if SD_UIKIT
+    UIImage *leftMirroredImage = [[UIImage alloc] initWithCGImage:leftMirroredCGImage];
+#else
+    UIImage *leftMirroredImage = [[UIImage alloc] initWithCGImage:leftMirroredCGImage size:NSZeroSize];
+#endif
+    expect([[leftMirroredImage sd_colorAtPoint:CGPointMake(160, 40)].sd_hexString isEqualToString:pointColor.sd_hexString]).beTruthy();
+    expect(leftMirroredImage.size).equal(CGSizeMake(200, 150));
+    CGImageRelease(leftMirroredCGImage);
+    
+    CGImageRef rightCGImage = [SDImageCoderHelper CGImageCreateDecoded:originalCGImage orientation:kCGImagePropertyOrientationRight];
+#if SD_UIKIT
+    UIImage *rightImage = [[UIImage alloc] initWithCGImage:rightCGImage];
+#else
+    UIImage *rightImage = [[UIImage alloc] initWithCGImage:rightCGImage size:NSZeroSize];
+#endif
+    expect([[rightImage sd_colorAtPoint:CGPointMake(30, 40)].sd_hexString isEqualToString:pointColor.sd_hexString]).beTruthy();
+    expect(rightImage.size).equal(CGSizeMake(200, 150));
+    CGImageRelease(rightCGImage);
+    
+    CGImageRef rightMirroredCGImage = [SDImageCoderHelper CGImageCreateDecoded:originalCGImage orientation:kCGImagePropertyOrientationRightMirrored];
+#if SD_UIKIT
+    UIImage *rightMirroredImage = [[UIImage alloc] initWithCGImage:rightMirroredCGImage];
+#else
+    UIImage *rightMirroredImage = [[UIImage alloc] initWithCGImage:rightMirroredCGImage size:NSZeroSize];
+#endif
+    expect([[rightMirroredImage sd_colorAtPoint:CGPointMake(30, 110)].sd_hexString isEqualToString:pointColor.sd_hexString]).beTruthy();
+    expect(rightMirroredImage.size).equal(CGSizeMake(200, 150));
+    CGImageRelease(rightMirroredCGImage);
+    
+    CGImageRef leftCGImage = [SDImageCoderHelper CGImageCreateDecoded:originalCGImage orientation:kCGImagePropertyOrientationLeft];
+#if SD_UIKIT
+    UIImage *leftImage = [[UIImage alloc] initWithCGImage:leftCGImage];
+#else
+    UIImage *leftImage = [[UIImage alloc] initWithCGImage:leftCGImage size:NSZeroSize];
+#endif
+    expect([[leftImage sd_colorAtPoint:CGPointMake(160, 110)].sd_hexString isEqualToString:pointColor.sd_hexString]).beTruthy();
+    expect(leftImage.size).equal(CGSizeMake(200, 150));
+    CGImageRelease(leftCGImage);
+}
+
+- (void)test21BMPImageCreateDecodedShouldNotBlank {
+    UIImage *testImage = [[UIImage alloc] initWithContentsOfFile:[self testBMPPathForName:@"TestImage"]];
+    CGImageRef cgImage = testImage.CGImage;
+    expect(cgImage).notTo.beNil();
+    UIImage *decodedImage = [SDImageCoderHelper decodedImageWithImage:testImage];
+    expect(decodedImage).notTo.beNil();
+    UIColor *testColor = [decodedImage sd_colorAtPoint:CGPointMake(100, 100)];
+    // Should not be black color
+    expect([[testColor sd_hexString] isEqualToString:UIColor.blackColor.sd_hexString]).beFalsy();
+}
+
+- (void)test22CGImageCreateScaledWithSize {
+    size_t width = 100;
+    size_t height = 100;
+    size_t scaledWidth = 50;
+    size_t scaledHeight = 50;
+    // RGB888
+    CGImageRef RGB888Image = ^(){
+        size_t bitsPerComponent = 8;
+        size_t components = 3;
+        size_t bitsPerPixel = bitsPerComponent * components;
+        size_t bytesPerRow = bitsPerPixel / 8 * width;
+        size_t size = bytesPerRow * height;
+        size_t count = width * height * components;
+        uint8_t bitmap[count];
+        for (size_t i = 0; i < count; i++) {
+            bitmap[i] = UINT8_MAX;
+        }
+        CGColorSpaceRef colorspace = [SDImageCoderHelper colorSpaceGetDeviceRGB];
+        CGBitmapInfo bitmapInfo = kCGImageAlphaNone | kCGBitmapByteOrderDefault;
+        CFDataRef data = CFDataCreate(NULL, (UInt8 *)bitmap, size);
+        CGDataProviderRef provider = CGDataProviderCreateWithCFData(data);
+        CFRelease(data);
+        BOOL shouldInterpolate = YES;
+        CGColorRenderingIntent intent = kCGRenderingIntentDefault;
+        CGImageRef cgImage = CGImageCreate(width, height, bitsPerComponent, bitsPerPixel, bytesPerRow, colorspace, bitmapInfo, provider, NULL, shouldInterpolate, intent);
+        CGDataProviderRelease(provider);
+        return cgImage;
+    }();
+    CGImageRef RGB888Scaled = [SDImageCoderHelper CGImageCreateScaled:RGB888Image size:CGSizeMake(scaledWidth, scaledHeight)];
+    XCTAssertEqual(CGImageGetWidth(RGB888Scaled), scaledWidth);
+    XCTAssertEqual(CGImageGetHeight(RGB888Scaled), scaledHeight);
+    SDAssertCGImagePixelFormatEqual(RGB888Scaled, RGB888Image);
+    SDAssertCGImageFirstComponentWhite(RGB888Scaled, kCVPixelFormatType_24RGB);
+
+    // RGB16161616
+    CGImageRef RGB161616Image = ^(){
+        size_t bitsPerComponent = 16;
+        size_t components = 3;
+        size_t bitsPerPixel = bitsPerComponent * components;
+        size_t bytesPerRow = bitsPerPixel / 8 * width;
+        size_t size = bytesPerRow * height;
+        size_t count = width * height * components;
+        uint16_t bitmap[count];
+        for (size_t i = 0; i < count; i++) {
+            bitmap[i] = UINT16_MAX;
+        }
+        CGColorSpaceRef colorspace = [SDImageCoderHelper colorSpaceGetDeviceRGB];
+        CGBitmapInfo bitmapInfo = kCGImageAlphaNone | kCGBitmapByteOrder16Host;
+        CFDataRef data = CFDataCreate(NULL, (UInt8 *)bitmap, size);
+        CGDataProviderRef provider = CGDataProviderCreateWithCFData(data);
+        CFRelease(data);
+        BOOL shouldInterpolate = YES;
+        CGColorRenderingIntent intent = kCGRenderingIntentDefault;
+        CGImageRef cgImage = CGImageCreate(width, height, bitsPerComponent, bitsPerPixel, bytesPerRow, colorspace, bitmapInfo, provider, NULL, shouldInterpolate, intent);
+        CGDataProviderRelease(provider);
+        return cgImage;
+    }();
+    CGImageRef RGB161616Scaled = [SDImageCoderHelper CGImageCreateScaled:RGB161616Image size:CGSizeMake(scaledWidth, scaledHeight)];
+    XCTAssertEqual(CGImageGetWidth(RGB161616Scaled), scaledWidth);
+    XCTAssertEqual(CGImageGetHeight(RGB161616Scaled), scaledHeight);
+    SDAssertCGImagePixelFormatEqual(RGB161616Scaled, RGB161616Image);
+    SDAssertCGImageFirstComponentWhite(RGB161616Scaled, kCVPixelFormatType_48RGB);
+    
+    // ARGB8888
+    CGImageRef ARGB8888Image = ^(){
+        size_t bitsPerComponent = 8;
+        size_t components = 4;
+        size_t bitsPerPixel = bitsPerComponent * components;
+        size_t bytesPerRow = bitsPerPixel / 8 * width;
+        size_t size = bytesPerRow * height;
+        size_t count = width * height * components;
+        uint8_t bitmap[count];
+        for (size_t i = 0; i < count; i++) {
+            bitmap[i] = UINT8_MAX;
+        }
+        CGColorSpaceRef colorspace = [SDImageCoderHelper colorSpaceGetDeviceRGB];
+        CGBitmapInfo bitmapInfo = kCGImageAlphaPremultipliedLast | kCGBitmapByteOrderDefault;
+        CFDataRef data = CFDataCreate(NULL, (UInt8 *)bitmap, size);
+        CGDataProviderRef provider = CGDataProviderCreateWithCFData(data);
+        CFRelease(data);
+        BOOL shouldInterpolate = YES;
+        CGColorRenderingIntent intent = kCGRenderingIntentDefault;
+        CGImageRef cgImage = CGImageCreate(width, height, bitsPerComponent, bitsPerPixel, bytesPerRow, colorspace, bitmapInfo, provider, NULL, shouldInterpolate, intent);
+        CGDataProviderRelease(provider);
+        return cgImage;
+    }();
+    CGImageRef ARGB8888Scaled = [SDImageCoderHelper CGImageCreateScaled:ARGB8888Image size:CGSizeMake(scaledWidth, scaledHeight)];
+    XCTAssertEqual(CGImageGetWidth(ARGB8888Scaled), scaledWidth);
+    XCTAssertEqual(CGImageGetHeight(ARGB8888Scaled), scaledHeight);
+    SDAssertCGImagePixelFormatEqual(ARGB8888Scaled, ARGB8888Image);
+    SDAssertCGImageFirstComponentWhite(ARGB8888Scaled, kCVPixelFormatType_32ARGB);
+    
+    // RGBA16161616
+    CGImageRef RGBA16161616Image = ^(){
+        size_t bitsPerComponent = 16;
+        size_t components = 4;
+        size_t bitsPerPixel = bitsPerComponent * components;
+        size_t bytesPerRow = bitsPerPixel / 8 * width;
+        size_t size = bytesPerRow * height;
+        size_t count = width * height * components;
+        uint16_t bitmap[count];
+        for (size_t i = 0; i < count; i++) {
+            bitmap[i] = UINT16_MAX;
+        }
+        CGColorSpaceRef colorspace = [SDImageCoderHelper colorSpaceGetDeviceRGB];
+        CGBitmapInfo bitmapInfo = kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder16Host;
+        CFDataRef data = CFDataCreate(NULL, (UInt8 *)bitmap, size);
+        CGDataProviderRef provider = CGDataProviderCreateWithCFData(data);
+        CFRelease(data);
+        BOOL shouldInterpolate = YES;
+        CGColorRenderingIntent intent = kCGRenderingIntentDefault;
+        CGImageRef cgImage = CGImageCreate(width, height, bitsPerComponent, bitsPerPixel, bytesPerRow, colorspace, bitmapInfo, provider, NULL, shouldInterpolate, intent);
+        CGDataProviderRelease(provider);
+        return cgImage;
+    }();
+    CGImageRef RGBA16161616Scaled = [SDImageCoderHelper CGImageCreateScaled:RGBA16161616Image size:CGSizeMake(scaledWidth, scaledHeight)];
+    XCTAssertEqual(CGImageGetWidth(RGBA16161616Scaled), scaledWidth);
+    XCTAssertEqual(CGImageGetHeight(RGBA16161616Scaled), scaledHeight);
+    SDAssertCGImagePixelFormatEqual(RGBA16161616Scaled, RGBA16161616Image);
+    SDAssertCGImageFirstComponentWhite(RGBA16161616Scaled, kCVPixelFormatType_64RGBALE);
+    
+    // RGBAFFFF
+    CGImageRef RGBAFFFFImage = ^(){
+        size_t bitsPerComponent = 32;
+        size_t components = 4;
+        size_t bitsPerPixel = bitsPerComponent * components;
+        size_t bytesPerRow = bitsPerPixel / 8 * width;
+        size_t size = bytesPerRow * height;
+        size_t count = width * height * components;
+        float bitmap[count];
+        for (size_t i = 0; i < count; i++) {
+            bitmap[i] = 1.0;
+        }
+        CGColorSpaceRef colorspace = [SDImageCoderHelper colorSpaceGetDeviceRGB];
+        CGBitmapInfo bitmapInfo = kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Host | kCGBitmapFloatComponents;
+        CFDataRef data = CFDataCreate(NULL, (UInt8 *)bitmap, size);
+        CGDataProviderRef provider = CGDataProviderCreateWithCFData(data);
+        CFRelease(data);
+        BOOL shouldInterpolate = YES;
+        CGColorRenderingIntent intent = kCGRenderingIntentDefault;
+        CGImageRef cgImage = CGImageCreate(width, height, bitsPerComponent, bitsPerPixel, bytesPerRow, colorspace, bitmapInfo, provider, NULL, shouldInterpolate, intent);
+        CGDataProviderRelease(provider);
+        return cgImage;
+    }();
+    CGImageRef RGBAFFFFScaled = [SDImageCoderHelper CGImageCreateScaled:RGBAFFFFImage size:CGSizeMake(scaledWidth, scaledHeight)];
+    XCTAssertEqual(CGImageGetWidth(RGBAFFFFScaled), scaledWidth);
+    XCTAssertEqual(CGImageGetHeight(RGBAFFFFScaled), scaledHeight);
+    SDAssertCGImagePixelFormatEqual(RGBAFFFFScaled, RGBAFFFFImage);
+    SDAssertCGImageFirstComponentWhite(RGBAFFFFScaled, kCVPixelFormatType_128RGBAFloat);
+    
+    // Cleanup and check by human eyes using preview, all should be white image
+    CGImageRelease(RGB888Image);
+    CGImageRelease(RGB888Scaled);
+    CGImageRelease(RGB161616Image);
+    CGImageRelease(RGB161616Scaled);
+    CGImageRelease(ARGB8888Image);
+    CGImageRelease(ARGB8888Scaled);
+    CGImageRelease(RGBA16161616Image);
+    CGImageRelease(RGBA16161616Scaled);
+    CGImageRelease(RGBAFFFFImage);
+    CGImageRelease(RGBAFFFFScaled);
+}
+
+#pragma mark - Helper
+
+- (UIImage *)testImageCG {
+    if (!_testImageCG) {
+        _testImageCG = [[UIImage alloc] initWithContentsOfFile:[self testPNGPathForName:@"TestImage"]];
+    }
+    return _testImageCG;
+}
+
+- (UIImage *)testImageCI {
+    if (!_testImageCI) {
+        CIImage *ciImage = [[CIImage alloc] initWithContentsOfURL:[NSURL fileURLWithPath:[self testPNGPathForName:@"TestImage"]]];
+#if SD_UIKIT
+        _testImageCI = [[UIImage alloc] initWithCIImage:ciImage scale:1 orientation:UIImageOrientationUp];
+#else
+        _testImageCI = [[UIImage alloc] initWithCIImage:ciImage scale:1 orientation:kCGImagePropertyOrientationUp];
+#endif
+    }
+    return _testImageCI;
+}
+
+- (NSString *)testPNGPathForName:(NSString *)name {
+    NSBundle *testBundle = [NSBundle bundleForClass:[self class]];
+    return [testBundle pathForResource:name ofType:@"png"];
+}
+
+- (NSString *)testBMPPathForName:(NSString *)name {
+  NSBundle *testBundle = [NSBundle bundleForClass:[self class]];
+  return [testBundle pathForResource:name ofType:@"bmp"];
+}
+
+@end
diff --git a/Tests/Tests/SDMockFileManager.h b/Tests/Tests/SDMockFileManager.h
new file mode 100644
index 000000000..71f2aceba
--- /dev/null
+++ b/Tests/Tests/SDMockFileManager.h
@@ -0,0 +1,18 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+
+// This is a mock class to provide custom error for methods
+@interface SDMockFileManager : NSFileManager
+
+@property (nonatomic, strong, readonly, nullable) NSError *lastError;
+
+@property (nonatomic, copy, nullable) NSDictionary<NSString *, NSError *> *mockSelectors; // used to specify mocked selectors which will return NO with specify error instead of normal process. If you specify a NSNull, will use nil instead.
+
+@end
diff --git a/Tests/Tests/SDMockFileManager.m b/Tests/Tests/SDMockFileManager.m
new file mode 100644
index 000000000..bf8cda58d
--- /dev/null
+++ b/Tests/Tests/SDMockFileManager.m
@@ -0,0 +1,38 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDMockFileManager.h"
+
+@interface SDMockFileManager ()
+
+@property (nonatomic, strong, nullable) NSError *lastError;
+
+@end
+
+@implementation SDMockFileManager
+
+- (BOOL)createDirectoryAtPath:(NSString *)path withIntermediateDirectories:(BOOL)createIntermediates attributes:(NSDictionary<NSFileAttributeKey,id> *)attributes error:(NSError * _Nullable __autoreleasing *)error {
+    self.lastError = nil;
+    NSError *mockError = [self.mockSelectors objectForKey:NSStringFromSelector(_cmd)];
+    if ([mockError isEqual:[NSNull null]]) {
+        if (error) {
+            *error = nil;
+        }
+        return NO;
+    } else if (mockError) {
+        if (error) {
+            *error = mockError;
+        }
+        self.lastError = mockError;
+        return NO;
+    } else {
+        return [super createDirectoryAtPath:path withIntermediateDirectories:createIntermediates attributes:attributes error:error];
+    }
+}
+
+@end
diff --git a/Tests/Tests/SDTestCase.h b/Tests/Tests/SDTestCase.h
index e17b517fb..27e1ad888 100644
--- a/Tests/Tests/SDTestCase.h
+++ b/Tests/Tests/SDTestCase.h
@@ -12,15 +12,27 @@
 
 #import <XCTest/XCTest.h>
 #import <Expecta/Expecta.h>
+#import <SDWebImage/SDWebImage.h>
+
+#if SD_MAC
+#define UIWindow NSWindow
+#define UIScreen NSScreen
+#endif
 
 FOUNDATION_EXPORT const int64_t kAsyncTestTimeout;
 FOUNDATION_EXPORT const int64_t kMinDelayNanosecond;
-FOUNDATION_EXPORT NSString * _Nonnull const kTestJpegURL;
+FOUNDATION_EXPORT NSString * _Nonnull const kTestJPEGURL;
+FOUNDATION_EXPORT NSString * _Nonnull const kTestProgressiveJPEGURL;
 FOUNDATION_EXPORT NSString * _Nonnull const kTestPNGURL;
+FOUNDATION_EXPORT NSString * _Nonnull const kTestGIFURL;
+FOUNDATION_EXPORT NSString * _Nonnull const kTestAPNGPURL;
 
 @interface SDTestCase : XCTestCase
 
+@property (nonatomic, strong, null_resettable) UIWindow *window;
+@property (nonatomic, readonly, class, getter=isCI) BOOL CI; // Check if GitHub CI
+
 - (void)waitForExpectationsWithCommonTimeout;
-- (void)waitForExpectationsWithCommonTimeoutUsingHandler:(nullable XCWaitCompletionHandler)handler;
+- (void)waitForExpectationsWithCommonTimeoutUsingHandler:(nullable XCWaitCompletionHandler)handler; 
 
 @end
diff --git a/Tests/Tests/SDTestCase.m b/Tests/Tests/SDTestCase.m
index c44b09135..995ec05aa 100644
--- a/Tests/Tests/SDTestCase.m
+++ b/Tests/Tests/SDTestCase.m
@@ -11,8 +11,11 @@
 
 const int64_t kAsyncTestTimeout = 5;
 const int64_t kMinDelayNanosecond = NSEC_PER_MSEC * 100; // 0.1s
-NSString *const kTestJpegURL = @"http://via.placeholder.com/50x50.jpg";
-NSString *const kTestPNGURL = @"http://via.placeholder.com/50x50.png";
+NSString *const kTestJPEGURL = @"https://placehold.co/50x50.jpg";
+NSString *const kTestProgressiveJPEGURL = @"https://raw.githubusercontent.com/ibireme/YYImage/master/Demo/YYImageDemo/mew_progressive.jpg";
+NSString *const kTestPNGURL = @"https://placehold.co/50x50.png";
+NSString *const kTestGIFURL = @"https://upload.wikimedia.org/wikipedia/commons/3/31/Eokxd.gif";
+NSString *const kTestAPNGPURL = @"https://upload.wikimedia.org/wikipedia/commons/1/14/Animated_PNG_example_bouncing_beach_ball.png";
 
 @implementation SDTestCase
 
@@ -24,4 +27,38 @@ - (void)waitForExpectationsWithCommonTimeoutUsingHandler:(XCWaitCompletionHandle
     [self waitForExpectationsWithTimeout:kAsyncTestTimeout handler:handler];
 }
 
++ (BOOL)isCI {
+    // https://docs.github.com/en/actions/learn-github-actions/variables
+    NSDictionary *env = NSProcessInfo.processInfo.environment;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        NSLog(@"printenv: %@", env.description);
+    });
+    if ([[env valueForKey:@"CI"] isEqualToString:@"true"]) {
+        return YES;
+    }
+    return NO;
+}
+
+#pragma mark - Helper
+- (UIWindow *)window {
+    if (!_window) {
+#if SD_UIKIT
+#if SD_VISION
+        CGSize screenSize = CGSizeMake(1280, 720); // https://developer.apple.com/design/human-interface-guidelines/windows#visionOS
+        CGRect screenFrame = CGRectMake(0, 0, screenSize.width, screenSize.height);
+#else
+        UIScreen *mainScreen = [UIScreen mainScreen];
+        CGRect screenFrame = mainScreen.bounds;
+#endif
+        _window = [[UIWindow alloc] initWithFrame:screenFrame];
+#endif // UIKit
+#if SD_MAC
+        UIScreen *mainScreen = [UIScreen mainScreen];
+        _window = [[NSWindow alloc] initWithContentRect:mainScreen.frame styleMask:0 backing:NSBackingStoreBuffered defer:NO screen:mainScreen];
+#endif
+    }
+    return _window;
+}
+
 @end
diff --git a/Tests/Tests/SDUtilsTests.m b/Tests/Tests/SDUtilsTests.m
new file mode 100644
index 000000000..ad18f7ddc
--- /dev/null
+++ b/Tests/Tests/SDUtilsTests.m
@@ -0,0 +1,240 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ * (c) Matt Galloway
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDTestCase.h"
+#import "SDWeakProxy.h"
+#import "SDDisplayLink.h"
+#import "SDInternalMacros.h"
+#import "SDFileAttributeHelper.h"
+#import "UIColor+SDHexString.h"
+
+@interface SDUtilsTests : SDTestCase
+
+@property (nonatomic) NSTimeInterval duration;
+
+@end
+
+@implementation SDUtilsTests
+
+- (void)testSDWeakProxy {
+    NSObject *object = [NSObject new];
+    SDWeakProxy *proxy = [SDWeakProxy proxyWithTarget:object];
+    SEL sel = @selector(hash);
+    NSMethodSignature *signature = [proxy methodSignatureForSelector:sel];
+    NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:signature];
+    [proxy forwardInvocation:invocation];
+    void *returnValue;
+    [invocation getReturnValue:&returnValue];
+    expect(returnValue).beNil();
+    expect([((NSObject *)proxy) forwardingTargetForSelector:sel]).equal(object);
+    expect(proxy.isProxy).beTruthy();
+    expect([proxy respondsToSelector:sel]).equal([object respondsToSelector:sel]);
+    expect([proxy isEqual:object]).beTruthy();
+    expect(proxy.hash).equal(object.hash);
+    expect(proxy.superclass).equal(object.superclass);
+    expect(proxy.class).equal(object.class);
+    expect([proxy isKindOfClass:NSObject.class]).equal([object isKindOfClass:NSObject.class]);
+    expect([proxy isMemberOfClass:NSObject.class]).equal([object isMemberOfClass:NSObject.class]);
+    expect([proxy conformsToProtocol:@protocol(NSObject)]).equal([object conformsToProtocol:@protocol(NSObject)]);
+    expect([proxy.description isEqualToString:object.description]).beTruthy();
+    expect([proxy.debugDescription isEqualToString:object.debugDescription]).beTruthy();
+}
+
+- (void)testSDDisplayLink {
+    XCTestExpectation *expectation1 = [self expectationWithDescription:@"Display Link Stop"];
+    XCTestExpectation *expectation2 = [self expectationWithDescription:@"Display Link Start"];
+    SDDisplayLink *displayLink = [SDDisplayLink displayLinkWithTarget:self selector:@selector(displayLinkDidRefresh:)];
+    [displayLink addToRunLoop:NSRunLoop.mainRunLoop forMode:NSRunLoopCommonModes];
+    [displayLink start];
+    expect(displayLink.isRunning).beTruthy();
+    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
+        expect(displayLink.isRunning).beTruthy();
+        NSTimeInterval duration = self.duration; // Should be 1, 200ms accuracy
+        expect(duration).beCloseToWithin(1, 0.2);
+        [displayLink stop];
+    });
+    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
+        expect(displayLink.isRunning).beFalsy();
+        [displayLink start];
+        [expectation1 fulfill];
+    });
+    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(3 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
+        expect(displayLink.isRunning).beTruthy();
+        [displayLink stop];
+        [expectation2 fulfill];
+    });
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)displayLinkDidRefresh:(SDDisplayLink *)displayLink {
+    NSTimeInterval duration = displayLink.duration; // Running value
+    self.duration += duration;
+}
+
+- (void)testSDFileAttributeHelper {
+    NSData *fileData = [@"File Data" dataUsingEncoding:NSUTF8StringEncoding];
+    NSData *extendedData = [@"Extended Data" dataUsingEncoding:NSUTF8StringEncoding];
+    NSString *filePath = @"/tmp/file.dat";
+    [NSFileManager.defaultManager removeItemAtPath:filePath error:nil];
+    [fileData writeToFile:filePath atomically:YES];
+    BOOL exist = [NSFileManager.defaultManager fileExistsAtPath:filePath];
+    expect(exist).beTruthy();
+    
+    NSArray *names = [SDFileAttributeHelper extendedAttributeNamesAtPath:filePath traverseLink:NO error:nil];
+    expect(names.count).equal(0);
+    
+    NSString *attr = @"com.hackemist.test";
+    [SDFileAttributeHelper setExtendedAttribute:attr value:extendedData atPath:filePath traverseLink:NO overwrite:YES error:nil];
+    
+    BOOL hasAttr =[SDFileAttributeHelper hasExtendedAttribute:attr atPath:filePath traverseLink:NO error:nil];
+    expect(hasAttr).beTruthy();
+    
+    names = [SDFileAttributeHelper extendedAttributeNamesAtPath:filePath traverseLink:NO error:nil];
+    expect(names.count).equal(1);
+    expect(names.firstObject).equal(attr);
+    
+    NSData *queriedData = [SDFileAttributeHelper extendedAttribute:attr atPath:filePath traverseLink:NO error:nil];
+    expect(extendedData).equal(queriedData);
+    
+    BOOL removed = [SDFileAttributeHelper removeExtendedAttribute:attr atPath:filePath traverseLink:NO error:nil];
+    expect(removed).beTruthy();
+    
+    hasAttr = [SDFileAttributeHelper hasExtendedAttribute:attr atPath:filePath traverseLink:NO error:nil];
+    expect(hasAttr).beFalsy();
+}
+
+- (void)testSDGraphicsImageRenderer {
+    // Main Screen
+    SDGraphicsImageRendererFormat *format = SDGraphicsImageRendererFormat.preferredFormat;
+#if SD_UIKIT
+#if SD_VISION
+    CGFloat screenScale = UITraitCollection.currentTraitCollection.displayScale;
+#else
+    CGFloat screenScale = [UIScreen mainScreen].scale;
+#endif
+#elif SD_MAC
+    CGFloat screenScale = [NSScreen mainScreen].backingScaleFactor;
+#endif
+    expect(format.scale).equal(screenScale);
+    expect(format.opaque).beFalsy();
+    expect(format.preferredRange).equal(SDGraphicsImageRendererFormatRangeAutomatic);
+    CGSize size = CGSizeMake(100, 100);
+    SDGraphicsImageRenderer *renderer = [[SDGraphicsImageRenderer alloc] initWithSize:size format:format];
+#if SD_MAC
+    // GitHub action's Mac does not connect to a display, so the ImageRenderer color space is wrong :(
+    if (SDTestCase.isCI) {
+        return;
+    }
+#endif
+    UIColor *color = UIColor.redColor;
+    NSLog(@"Draw Color ColorSpace: %@", color.CGColor);
+    UIImage *image = [renderer imageWithActions:^(CGContextRef  _Nonnull context) {
+        CGContextSetFillColorWithColor(context, [color CGColor]);
+        CGContextFillRect(context, CGRectMake(0, 0, size.width, size.height));
+    }];
+    expect(image.scale).equal(format.scale);
+    UIColor *testColor = [image sd_colorAtPoint:CGPointMake(50, 50)];
+    NSLog(@"Test Color ColorSpace: %@", testColor.CGColor);
+    expect(testColor.sd_hexString).equal(color.sd_hexString);
+    
+    UIColor *grayscaleColor = UIColor.blackColor;
+    UIImage *grayscaleImage = [renderer imageWithActions:^(CGContextRef  _Nonnull context) {
+        CGContextSetFillColorWithColor(context, [grayscaleColor CGColor]);
+        CGContextFillRect(context, CGRectMake(0, 0, size.width, size.height));
+    }];
+    expect([grayscaleImage sd_colorAtPoint:CGPointMake(50, 50)].sd_hexString).equal(grayscaleColor.sd_hexString);
+}
+
+- (void)testSDScaledImageForKey {
+    // Test nil
+    expect(SDScaledImageForKey(nil, nil)).beNil();
+    // Test @2x
+    NSData *data = [NSData dataWithContentsOfFile:[self testGIFPath]];
+    UIImage * image = [UIImage sd_imageWithGIFData:data];
+    expect(image.sd_isAnimated).beTruthy();
+    expect(image.scale).equal(1);
+    
+    UIImage *scaledImage = SDScaledImageForKey(@"test@2x.gif", image);
+    expect(scaledImage.scale).equal(2);
+}
+
+- (void)testSDCallbackQueue {
+    XCTestExpectation *expectation1 = [self expectationWithDescription:@"SDCallbackQueue SafeExecute works"];
+    XCTestExpectation *expectation2 = [self expectationWithDescription:@"SDCallbackQueue Dispatch works"];
+    XCTestExpectation *expectation3 = [self expectationWithDescription:@"SDCallbackQueue Invoke works"];
+    dispatch_queue_t queue = dispatch_queue_create("testSDCallbackQueue", NULL);
+    SDCallbackQueue *callbackQueue = [[SDCallbackQueue alloc] initWithDispatchQueue:queue];
+    __block BOOL called = NO;
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+    [callbackQueue sync:^{
+        called = YES;
+    }];
+#pragma clang diagnostic pop
+    expect(called).beTruthy();
+    
+    __block BOOL called1 = NO;
+    callbackQueue.policy = SDCallbackPolicySafeExecute;
+    dispatch_async(queue, ^{
+        // Should execute in sync
+        [callbackQueue async:^{
+            called1 = YES;
+            [expectation1 fulfill];
+        }];
+        expect(called1).beTruthy();
+    });
+    
+    SDCallbackQueue *callbackQueue2 = [[SDCallbackQueue alloc] initWithDispatchQueue:queue];
+    __block BOOL called2 = NO;
+    callbackQueue2.policy = SDCallbackPolicyDispatch;
+    dispatch_async(queue, ^{
+        // Should execute in async
+        [callbackQueue2 async:^{
+            called2 = YES;
+            [expectation2 fulfill];
+        }];
+        expect(called2).beFalsy();
+    });
+    
+    SDCallbackQueue *callbackQueue3 = [[SDCallbackQueue alloc] initWithDispatchQueue:queue];
+    __block BOOL called3 = NO;
+    callbackQueue3.policy = SDCallbackPolicyInvoke;
+    dispatch_async(queue, ^{
+        // Should execute in sync
+        [callbackQueue3 async:^{
+            called3 = YES;
+            [expectation3 fulfill];
+        }];
+        expect(called3).beTruthy();
+    });
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)testInternalMacro {
+    @weakify(self);
+    @onExit {
+        @strongify(self);
+        expect(self).notTo.beNil();
+    };
+}
+
+#pragma mark - Helper
+
+- (NSString *)testJPEGPath {
+    NSBundle *testBundle = [NSBundle bundleForClass:[self class]];
+    return [testBundle pathForResource:@"TestImage" ofType:@"jpg"];
+}
+
+- (NSString *)testGIFPath {
+    NSBundle *testBundle = [NSBundle bundleForClass:[self class]];
+    return [testBundle pathForResource:@"TestImage" ofType:@"gif"];
+}
+
+@end
diff --git a/Tests/Tests/SDWebCacheCategoriesTests.m b/Tests/Tests/SDWebCacheCategoriesTests.m
new file mode 100644
index 000000000..2fa7aacfe
--- /dev/null
+++ b/Tests/Tests/SDWebCacheCategoriesTests.m
@@ -0,0 +1,682 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ * (c) Matt Galloway
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDTestCase.h"
+#import <KVOController/KVOController.h>
+
+@interface SDWebCacheCategoriesTests : SDTestCase
+
+@end
+
+@implementation SDWebCacheCategoriesTests
+
+- (void)testUIImageViewSetImageWithURL {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"UIImageView setImageWithURL"];
+    
+    UIImageView *imageView = [[UIImageView alloc] init];
+    NSURL *originalImageURL = [NSURL URLWithString:kTestJPEGURL];
+    [imageView sd_setImageWithURL:originalImageURL
+                        completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+                            expect(image).toNot.beNil();
+                            expect(error).to.beNil();
+                            expect(originalImageURL).to.equal(imageURL);
+                            expect(imageView.image).to.equal(image);
+                            [expectation fulfill];
+                        }];
+    expect(imageView.sd_imageURL).equal(originalImageURL);
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)testUIImageViewSetImageWithURLDiskSync {
+    NSData *imageData = [NSData dataWithContentsOfFile:[self testJPEGPath]];
+    
+    // Ensure the image is cached in disk but not memory
+    [SDImageCache.sharedImageCache removeImageFromMemoryForKey:kTestJPEGURL];
+    [SDImageCache.sharedImageCache removeImageFromDiskForKey:kTestJPEGURL];
+    [SDImageCache.sharedImageCache storeImageDataToDisk:imageData forKey:kTestJPEGURL];
+    
+    UIImageView *imageView = [[UIImageView alloc] init];
+    NSURL *originalImageURL = [NSURL URLWithString:kTestJPEGURL];
+    
+    [imageView sd_setImageWithURL:originalImageURL
+                 placeholderImage:nil
+                          options:SDWebImageQueryDiskDataSync
+                        completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+                            expect(image).toNot.beNil();
+                            expect(error).to.beNil();
+                            expect(originalImageURL).to.equal(imageURL);
+                            expect(imageView.image).to.equal(image);
+                        }];
+    expect(imageView.sd_imageURL).equal(originalImageURL);
+    expect(imageView.image).toNot.beNil();
+}
+
+#if SD_UIKIT
+- (void)testUIImageViewSetHighlightedImageWithURL {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"UIImageView setHighlightedImageWithURL"];
+    
+    UIImageView *imageView = [[UIImageView alloc] init];
+    NSURL *originalImageURL = [NSURL URLWithString:kTestJPEGURL];
+    [imageView sd_setHighlightedImageWithURL:originalImageURL
+                                   completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+                                       expect(image).toNot.beNil();
+                                       expect(error).to.beNil();
+                                       expect(originalImageURL).to.equal(imageURL);
+                                       expect(imageView.highlightedImage).to.equal(image);
+                                       [expectation fulfill];
+                                   }];
+    [self waitForExpectationsWithCommonTimeout];
+}
+#endif
+
+- (void)testMKAnnotationViewSetImageWithURL {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"MKAnnotationView setImageWithURL"];
+    
+    MKAnnotationView *annotationView = [[MKAnnotationView alloc] init];
+    NSURL *originalImageURL = [NSURL URLWithString:kTestJPEGURL];
+    [annotationView sd_setImageWithURL:originalImageURL
+                             completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+                                 expect(image).toNot.beNil();
+                                 expect(error).to.beNil();
+                                 expect(originalImageURL).to.equal(imageURL);
+                                 expect(annotationView.image).to.equal(image);
+                                 [expectation fulfill];
+                             }];
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+#if SD_UIKIT
+- (void)testUIButtonSetImageWithURLNormalState {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"UIButton setImageWithURL normalState"];
+    
+    UIButton *button = [[UIButton alloc] init];
+    NSURL *originalImageURL = [NSURL URLWithString:kTestJPEGURL];
+    [button sd_setImageWithURL:originalImageURL
+                      forState:UIControlStateNormal
+                     completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+                         expect(image).toNot.beNil();
+                         expect(error).to.beNil();
+                         expect(originalImageURL).to.equal(imageURL);
+                         expect([button imageForState:UIControlStateNormal]).to.equal(image);
+                         [expectation fulfill];
+                     }];
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)testUIButtonSetImageWithURLHighlightedState {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"UIButton setImageWithURL highlightedState"];
+    
+    UIButton *button = [[UIButton alloc] init];
+    NSURL *originalImageURL = [NSURL URLWithString:kTestJPEGURL];
+    [button sd_setImageWithURL:originalImageURL
+                      forState:UIControlStateHighlighted
+                     completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+                         expect(image).toNot.beNil();
+                         expect(error).to.beNil();
+                         expect(originalImageURL).to.equal(imageURL);
+                         expect([button imageForState:UIControlStateHighlighted]).to.equal(image);
+                         [expectation fulfill];
+                     }];
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)testUIButtonSetBackgroundImageWithURLNormalState {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"UIButton setBackgroundImageWithURL normalState"];
+    
+    UIButton *button = [[UIButton alloc] init];
+    NSURL *originalImageURL = [NSURL URLWithString:kTestJPEGURL];
+    [button sd_setBackgroundImageWithURL:originalImageURL
+                                forState:UIControlStateNormal
+                               completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+                                   expect(image).toNot.beNil();
+                                   expect(error).to.beNil();
+                                   expect(originalImageURL).to.equal(imageURL);
+                                   expect([button backgroundImageForState:UIControlStateNormal]).to.equal(image);
+                                   [expectation fulfill];
+                               }];
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)testUIButtonBackgroundImageCancelCurrentImageLoad {
+    UIButton *button = [[UIButton alloc] init];
+    NSURL *originalImageURL = [NSURL URLWithString:kTestJPEGURL];
+    [button sd_setBackgroundImageWithURL:originalImageURL forState:UIControlStateNormal];
+    [button sd_cancelBackgroundImageLoadForState:UIControlStateNormal];
+    NSString *backgroundImageOperationKey = [self testBackgroundImageOperationKeyForState:UIControlStateNormal];
+    expect([button sd_imageLoadOperationForKey:backgroundImageOperationKey]).beNil();
+}
+
+#endif
+
+#if SD_MAC
+- (void)testNSButtonSetImageWithURL {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"NSButton setImageWithURL"];
+    
+    NSButton *button = [[NSButton alloc] init];
+    NSURL *originalImageURL = [NSURL URLWithString:kTestJPEGURL];
+    [button sd_setImageWithURL:originalImageURL
+                     completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+                         expect(image).toNot.beNil();
+                         expect(error).to.beNil();
+                         expect(originalImageURL).to.equal(imageURL);
+                         expect(button.image).to.equal(image);
+                         [expectation fulfill];
+                     }];
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)testNSButtonSetAlternateImageWithURL {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"NSButton setAlternateImageWithURL"];
+    
+    NSButton *button = [[NSButton alloc] init];
+    NSURL *originalImageURL = [NSURL URLWithString:kTestJPEGURL];
+    [button sd_setAlternateImageWithURL:originalImageURL
+                              completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+                                  expect(image).toNot.beNil();
+                                  expect(error).to.beNil();
+                                  expect(originalImageURL).to.equal(imageURL);
+                                  expect(button.alternateImage).to.equal(image);
+                                  [expectation fulfill];
+                              }];
+    [self waitForExpectationsWithCommonTimeout];
+}
+#endif
+
+- (void)testUIViewInternalSetImageWithURL {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"UIView internalSetImageWithURL"];
+    
+    UIView *view = [[UIView alloc] init];
+#if SD_MAC
+    view.wantsLayer = YES;
+#endif
+    NSURL *originalImageURL = [NSURL URLWithString:kTestJPEGURL];
+    UIImage *placeholder = [[UIImage alloc] initWithContentsOfFile:[self testJPEGPath]];
+    [view sd_internalSetImageWithURL:originalImageURL
+                    placeholderImage:placeholder
+                             options:0
+                             context:nil
+                       setImageBlock:^(UIImage * _Nullable image, NSData * _Nullable imageData, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+                           if (!imageData && cacheType == SDImageCacheTypeNone) {
+                               // placeholder
+                               expect(image).to.equal(placeholder);
+                           } else {
+                               // cache or download
+                               expect(image).toNot.beNil();
+                           }
+                           view.layer.contents = (__bridge id _Nullable)(image.CGImage);
+                       }
+                            progress:nil
+                           completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+                               expect(image).toNot.beNil();
+                               expect(error).to.beNil();
+                               expect(originalImageURL).to.equal(imageURL);
+                               expect((__bridge CGImageRef)view.layer.contents == image.CGImage).to.beTruthy();
+                               [expectation fulfill];
+                           }];
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)testUIViewCancelWithDelayPlaceholderShouldCallbackOnceBeforeSecond {
+    XCTestExpectation *expectation1 = [self expectationWithDescription:@"UIView internalSetImageWithURL call 1"];
+    XCTestExpectation *expectation2 = [self expectationWithDescription:@"UIView internalSetImageWithURL call 2"];
+    
+    UIView *imageView = [[UIView alloc] init];
+    NSURL *originalImageURL = [NSURL URLWithString:kTestJPEGURL];
+    [SDImageCache.sharedImageCache removeImageFromDiskForKey:kTestJPEGURL];
+    [SDImageCache.sharedImageCache removeImageFromMemoryForKey:kTestJPEGURL];
+    
+    __block NSUInteger calledSetImageTimes = 0;
+    __block NSUInteger calledSetImageTimes2 = 0;
+    NSString *operationKey = NSUUID.UUID.UUIDString;
+    UIImage *placeholder1 = UIImage.new;
+    id<SDWebImageOperation> op1 = [imageView sd_internalSetImageWithURL:originalImageURL placeholderImage:placeholder1 options:SDWebImageDelayPlaceholder context:@{ SDWebImageContextSetImageOperationKey:operationKey} setImageBlock:^(UIImage * _Nullable image, NSData * _Nullable imageData, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+        // Should called before second query (We changed the cache callback in sync when cancelled)
+        expect(calledSetImageTimes2).equal(0);
+        calledSetImageTimes++;
+    } progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+        if (calledSetImageTimes == 1) {
+            [expectation1 fulfill];
+        }
+    }];
+    [op1 cancel];
+    
+    UIImage *placeholder2 = UIImage.new;
+    [imageView sd_internalSetImageWithURL:originalImageURL placeholderImage:placeholder2 options:0 context:@{ SDWebImageContextSetImageOperationKey:operationKey} setImageBlock:^(UIImage * _Nullable image, NSData * _Nullable imageData, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+        if (calledSetImageTimes2 == 0) {
+            expect(image).equal(placeholder2);
+        } else {
+            expect(image).notTo.beNil();
+        }
+        calledSetImageTimes2++;
+    } progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+        if (calledSetImageTimes2 == 2) {
+            [expectation2 fulfill];
+        }
+    }];
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)testUIViewCancelWithoutDelayPlaceholderShouldCallbackOnceBeforeSecond {
+    XCTestExpectation *expectation1 = [self expectationWithDescription:@"UIView internalSetImageWithURL call 1"];
+    XCTestExpectation *expectation2 = [self expectationWithDescription:@"UIView internalSetImageWithURL call 2"];
+    
+    UIView *imageView = [[UIView alloc] init];
+    NSURL *originalImageURL = [NSURL URLWithString:kTestJPEGURL];
+    [SDImageCache.sharedImageCache removeImageFromDiskForKey:kTestJPEGURL];
+    [SDImageCache.sharedImageCache removeImageFromMemoryForKey:kTestJPEGURL];
+    
+    __block NSUInteger calledSetImageTimes = 0;
+    __block NSUInteger calledSetImageTimes2 = 0;
+    NSString *operationKey = NSUUID.UUID.UUIDString;
+    UIImage *placeholder1 = UIImage.new;
+    id<SDWebImageOperation> op1 = [imageView sd_internalSetImageWithURL:originalImageURL placeholderImage:placeholder1 options:0 context:@{ SDWebImageContextSetImageOperationKey:operationKey} setImageBlock:^(UIImage * _Nullable image, NSData * _Nullable imageData, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+        // Should called before second query (We changed the cache callback in sync when cancelled)
+        expect(calledSetImageTimes2).equal(0);
+        calledSetImageTimes++;
+    } progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+        if (calledSetImageTimes == 1) {
+            [expectation1 fulfill];
+        }
+    }];
+    [op1 cancel];
+    
+    UIImage *placeholder2 = UIImage.new;
+    [imageView sd_internalSetImageWithURL:originalImageURL placeholderImage:placeholder2 options:0 context:@{ SDWebImageContextSetImageOperationKey:operationKey} setImageBlock:^(UIImage * _Nullable image, NSData * _Nullable imageData, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+        if (calledSetImageTimes2 == 0) {
+            expect(image).equal(placeholder2);
+        } else {
+            expect(image).notTo.beNil();
+        }
+        calledSetImageTimes2++;
+    } progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+        if (calledSetImageTimes2 == 2) {
+            [expectation2 fulfill];
+        }
+    }];
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)testUIViewAutoCancelImage {
+    UIView *imageView = [[UIView alloc] init];
+    NSURL *originalImageURL = [NSURL URLWithString:kTestJPEGURL];
+    [SDImageCache.sharedImageCache removeImageFromDiskForKey:kTestJPEGURL];
+    [SDImageCache.sharedImageCache removeImageFromMemoryForKey:kTestJPEGURL];
+    SDWebImageCombinedOperation *op1 = [imageView sd_internalSetImageWithURL:originalImageURL placeholderImage:nil options:0 context:nil setImageBlock:nil progress:nil completed:nil];
+    SDWebImageCombinedOperation *op2 = [imageView sd_internalSetImageWithURL:originalImageURL placeholderImage:nil options:0 context:nil setImageBlock:nil progress:nil completed:nil];
+    // op1 should be automatically cancelled
+    expect(op1.isCancelled).beTruthy();
+    expect(op2.isCancelled).beFalsy();
+}
+
+- (void)testUIViewAvoidAutoCancelImage {
+    UIView *imageView = [[UIView alloc] init];
+    NSURL *originalImageURL = [NSURL URLWithString:kTestJPEGURL];
+    [SDImageCache.sharedImageCache removeImageFromDiskForKey:kTestJPEGURL];
+    [SDImageCache.sharedImageCache removeImageFromMemoryForKey:kTestJPEGURL];
+    SDWebImageCombinedOperation *op1 = [imageView sd_internalSetImageWithURL:originalImageURL placeholderImage:nil options:0 context:nil setImageBlock:nil progress:nil completed:nil];
+    SDWebImageCombinedOperation *op2 = [imageView sd_internalSetImageWithURL:originalImageURL placeholderImage:nil options:SDWebImageAvoidAutoCancelImage context:nil setImageBlock:nil progress:nil completed:nil];
+    // opt1 should not be automatically cancelled
+    expect(op1.isCancelled).beFalsy();
+    expect(op2.isCancelled).beFalsy();
+}
+
+- (void)testUIViewCancelCurrentImageLoad {
+    UIView *imageView = [[UIView alloc] init];
+    NSURL *originalImageURL = [NSURL URLWithString:kTestJPEGURL];
+    [SDImageCache.sharedImageCache removeImageFromDiskForKey:kTestJPEGURL];
+    [SDImageCache.sharedImageCache removeImageFromMemoryForKey:kTestJPEGURL];
+    SDWebImageCombinedOperation *op1 = [imageView sd_internalSetImageWithURL:originalImageURL placeholderImage:nil options:0 context:nil setImageBlock:nil progress:nil completed:nil];
+    [imageView sd_cancelLatestImageLoad];
+    expect(op1.isCancelled).beTruthy();
+    NSString *operationKey = NSStringFromClass(UIView.class);
+    expect([imageView sd_imageLoadOperationForKey:operationKey]).beNil();
+}
+
+- (void)testUIViewCancelCurrentImageLoadWithTransition {
+    UIView *imageView = [[UIView alloc] init];
+    NSURL *firstImageUrl = [NSURL URLWithString:@"https://placehold.co/201x201.jpg"];
+    NSURL *secondImageUrl = [NSURL URLWithString:@"https://placehold.co/201x201.png"];
+
+    // First, reset our caches
+    [SDImageCache.sharedImageCache removeImageFromMemoryForKey:firstImageUrl.absoluteString];
+    [SDImageCache.sharedImageCache removeImageFromDiskForKey:firstImageUrl.absoluteString];
+    [SDImageCache.sharedImageCache removeImageFromMemoryForKey:secondImageUrl.absoluteString];
+    [SDImageCache.sharedImageCache removeImageFromDiskForKey:secondImageUrl.absoluteString];
+
+    // Next, lets put our second image into memory, so that the next time
+    // we load it, it will come from memory, and thus shouldUseTransition will be NO
+    XCTestExpectation *firstLoadExpectation = [self expectationWithDescription:@"First image loaded"];
+
+    [imageView sd_internalSetImageWithURL:secondImageUrl placeholderImage:nil options:0 context:nil setImageBlock:nil progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+        [firstLoadExpectation fulfill];
+    }];
+
+    [self waitForExpectations:@[firstLoadExpectation]
+                      timeout:5.0];
+
+    // Now, lets load a new image using a transition
+    XCTestExpectation *secondLoadExpectation = [self expectationWithDescription:@"Second image loaded"];
+    XCTestExpectation *transitionPreparesExpectation = [self expectationWithDescription:@"Transition prepares"];
+
+    // Build a custom transition with a completion block that
+    // we do not expect to be called, because we cancel in the
+    // middle of a transition
+    XCTestExpectation *transitionCompletionExpecation = [self expectationWithDescription:@"Transition completed"];
+    transitionCompletionExpecation.inverted = YES;
+
+    SDWebImageTransition *customTransition = [SDWebImageTransition new];
+    customTransition.duration = 1.0;
+    customTransition.prepares = ^(__kindof UIView * _Nonnull view, UIImage * _Nullable image, NSData * _Nullable imageData, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+        [transitionPreparesExpectation fulfill];
+    };
+    customTransition.completion = ^(BOOL finished) {
+        [transitionCompletionExpecation fulfill];
+    };
+
+    // Now, load our first image URL (maybe as part of a UICollectionView)
+    // We use a custom context to ensure a unique ImageOperationKey for every load
+    // that is requested
+    NSMutableDictionary *context = [NSMutableDictionary new];
+    context[SDWebImageContextSetImageOperationKey] = firstImageUrl.absoluteString;
+
+    imageView.sd_imageTransition = customTransition;
+    [imageView sd_internalSetImageWithURL:firstImageUrl placeholderImage:nil options:0 context:context setImageBlock:nil progress:nil completed:nil];
+    [self waitForExpectations:@[transitionPreparesExpectation] timeout:5.0];
+
+    // At this point, our transition has started, and so we cancel the load operation,
+    // perhaps as a result of a call to `prepareForReuse` in a UICollectionViewCell
+    [imageView sd_cancelLatestImageLoad];
+
+    // Now, we update our context's imageOperationKey and URL, perhaps
+    // because of a re-use of a UICollectionViewCell. In this case,
+    // we are assigning an image URL that is already present in the
+    // memory cache
+    context[SDWebImageContextSetImageOperationKey] = secondImageUrl.absoluteString;
+    [imageView sd_internalSetImageWithURL:secondImageUrl placeholderImage:nil options:0 context:context setImageBlock:nil progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+
+        [secondLoadExpectation fulfill];
+    }];
+
+    // The original load operation's transitionCompletionExpecation should never
+    // be called (it has been inverted, above)
+    [self waitForExpectations:@[secondLoadExpectation, transitionCompletionExpecation]
+                      timeout:5.0];
+}
+
+- (void)testUIViewCancelCallbackWithError {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"UIView internalSetImageWithURL cancel callback error"];
+    
+    UIView *imageView = [[UIView alloc] init];
+    NSURL *originalImageURL = [NSURL URLWithString:kTestJPEGURL];
+    [SDImageCache.sharedImageCache removeImageFromDiskForKey:kTestJPEGURL];
+    [SDImageCache.sharedImageCache removeImageFromMemoryForKey:kTestJPEGURL];
+    [imageView sd_internalSetImageWithURL:originalImageURL placeholderImage:nil options:0 context:nil setImageBlock:nil progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+        expect(error).notTo.beNil();
+        expect(error.code).equal(SDWebImageErrorCancelled);
+        [expectation fulfill];
+    }];
+    [imageView sd_cancelLatestImageLoad];
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)testUIViewImageProgressKVOWork {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"UIView imageProgressKVO failed"];
+    UIView *view = [[UIView alloc] init];
+    NSURL *originalImageURL = [NSURL URLWithString:kTestJPEGURL];
+    
+    [self.KVOController observe:view.sd_imageProgress keyPath:NSStringFromSelector(@selector(fractionCompleted)) options:NSKeyValueObservingOptionNew block:^(id  _Nullable observer, id  _Nonnull object, NSDictionary<NSString *,id> * _Nonnull change) {
+        NSProgress *progress = object;
+        NSNumber *completedValue = change[NSKeyValueChangeNewKey];
+        expect(progress.fractionCompleted).equal(completedValue.doubleValue);
+        // mark that KVO is called
+        [progress setUserInfoObject:@(YES) forKey:NSStringFromSelector(@selector(testUIViewImageProgressKVOWork))];
+    }];
+    
+    // Clear the disk cache to force download from network
+    [[SDImageCache sharedImageCache] removeImageForKey:kTestJPEGURL withCompletion:^{
+        [view sd_internalSetImageWithURL:originalImageURL placeholderImage:nil options:0 context:nil setImageBlock:nil progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+            expect(view.sd_imageProgress.fractionCompleted).equal(1.0);
+            expect([view.sd_imageProgress.userInfo[NSStringFromSelector(_cmd)] boolValue]).equal(YES);
+            [expectation fulfill];
+        }];
+    }];
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)testUIViewTransitionFromNetworkWork {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"UIView transition from network does not work"];
+    
+    // Attach a window, or CALayer will not submit drawing
+    UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 50, 50)];
+    // Cover each convenience method
+    imageView.sd_imageTransition = SDWebImageTransition.fadeTransition;
+    imageView.sd_imageTransition = SDWebImageTransition.flipFromTopTransition;
+    imageView.sd_imageTransition = SDWebImageTransition.flipFromLeftTransition;
+    imageView.sd_imageTransition = SDWebImageTransition.flipFromBottomTransition;
+    imageView.sd_imageTransition = SDWebImageTransition.flipFromRightTransition;
+    imageView.sd_imageTransition = SDWebImageTransition.curlUpTransition;
+    imageView.sd_imageTransition = SDWebImageTransition.curlDownTransition;
+    imageView.sd_imageTransition.duration = 1;
+    
+#if SD_UIKIT
+    [self.window addSubview:imageView];
+#else
+    imageView.wantsLayer = YES;
+    [self.window.contentView addSubview:imageView];
+#endif
+    
+    UIImage *placeholder = [[UIImage alloc] initWithContentsOfFile:[self testJPEGPath]];
+    
+    NSURL *originalImageURL = [NSURL URLWithString:kTestJPEGURL];
+    __weak typeof(imageView) wimageView = imageView;
+    [imageView sd_setImageWithURL:originalImageURL
+                 placeholderImage:placeholder
+                          options:SDWebImageForceTransition
+                        completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+                            __strong typeof(wimageView) simageView = imageView;
+                            // Delay to let CALayer commit the transition in next runloop
+                            dispatch_after(dispatch_time(DISPATCH_TIME_NOW, kMinDelayNanosecond), dispatch_get_main_queue(), ^{
+                                // Check current view contains layer animation
+                                NSArray *animationKeys = simageView.layer.animationKeys;
+                                expect(animationKeys.count).beGreaterThan(0);
+                                [expectation fulfill];
+                            });
+                        }];
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)testUIViewTransitionFromDiskWork {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"UIView transition from disk does not work"];
+    
+    // Attach a window, or CALayer will not submit drawing
+    UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 50, 50)];
+    imageView.sd_imageTransition = SDWebImageTransition.fadeTransition;
+    imageView.sd_imageTransition.duration = 1;
+    
+#if SD_UIKIT
+    [self.window addSubview:imageView];
+#else
+    imageView.wantsLayer = YES;
+    [self.window.contentView addSubview:imageView];
+#endif
+    
+    NSData *imageData = [NSData dataWithContentsOfFile:[self testJPEGPath]];
+    UIImage *placeholder = [[UIImage alloc] initWithData:imageData];
+    
+    // Ensure the image is cached in disk but not memory
+    [SDImageCache.sharedImageCache removeImageFromMemoryForKey:kTestJPEGURL];
+    [SDImageCache.sharedImageCache removeImageFromDiskForKey:kTestJPEGURL];
+    [SDImageCache.sharedImageCache storeImageDataToDisk:imageData forKey:kTestJPEGURL];
+    
+    NSURL *originalImageURL = [NSURL URLWithString:kTestJPEGURL];
+    __weak typeof(imageView) wimageView = imageView;
+    [imageView sd_setImageWithURL:originalImageURL
+                 placeholderImage:placeholder
+                          options:SDWebImageFromCacheOnly // Ensure we queired from disk cache
+                        completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+                            [SDImageCache.sharedImageCache removeImageFromMemoryForKey:kTestJPEGURL];
+                            [SDImageCache.sharedImageCache removeImageFromDiskForKey:kTestJPEGURL];
+                            __strong typeof(wimageView) simageView = imageView;
+                            // Delay to let CALayer commit the transition in next runloop
+                            dispatch_after(dispatch_time(DISPATCH_TIME_NOW, kMinDelayNanosecond), dispatch_get_main_queue(), ^{
+                                // Check current view contains layer animation
+                                NSArray *animationKeys = simageView.layer.animationKeys;
+                                expect(animationKeys.count).beGreaterThan(0);
+                                [expectation fulfill];
+                            });
+                        }];
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)testUIViewIndicatorWork {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"UIView indicator does not work"];
+    
+    UIImageView *imageView = [[UIImageView alloc] init];
+#if SD_IOS
+    imageView.sd_imageIndicator = SDWebImageActivityIndicator.grayIndicator;
+    // Cover each convience method, finally use progress indicator for test
+    imageView.sd_imageIndicator = SDWebImageActivityIndicator.grayLargeIndicator;
+    imageView.sd_imageIndicator = SDWebImageActivityIndicator.whiteIndicator;
+    imageView.sd_imageIndicator = SDWebImageActivityIndicator.whiteLargeIndicator;
+    imageView.sd_imageIndicator = SDWebImageProgressIndicator.barIndicator;
+#endif
+    imageView.sd_imageIndicator = SDWebImageProgressIndicator.defaultIndicator;
+    // Test setter trigger removeFromSuperView
+    expect(imageView.subviews.count).equal(1);
+    
+    NSURL *originalImageURL = [NSURL URLWithString:kTestJPEGURL];
+    __weak typeof(imageView) wimageView = imageView;
+    [imageView sd_setImageWithURL:originalImageURL
+                 placeholderImage:nil options:SDWebImageFromLoaderOnly progress:^(NSInteger receivedSize, NSInteger expectedSize, NSURL * _Nullable targetURL) {
+                     dispatch_async(dispatch_get_main_queue(), ^{
+                         __strong typeof(wimageView) simageView = imageView;
+                         UIView *indicatorView = simageView.subviews.firstObject;
+                         expect(indicatorView).equal(simageView.sd_imageIndicator.indicatorView);
+                         
+                         if (receivedSize <= 0 || expectedSize <= 0) {
+                             return;
+                         }
+                         
+                         // Base on current implementation, since we dispatch the progressBlock to main queue, the indicator's progress state should be synchonized
+                         double progress = 0;
+                         double imageProgress = (double)receivedSize / (double)expectedSize;
+#if SD_UIKIT
+                         progress = ((UIProgressView *)simageView.sd_imageIndicator.indicatorView).progress;
+#else
+                         progress = ((NSProgressIndicator *)simageView.sd_imageIndicator.indicatorView).doubleValue / 100;
+#endif
+                         expect(progress).equal(imageProgress);
+                     });
+                 } completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+                     __strong typeof(wimageView) simageView = imageView;
+                     double progress = 0;
+#if SD_UIKIT
+                     progress = ((UIProgressView *)simageView.sd_imageIndicator.indicatorView).progress;
+#else
+                     progress = ((NSProgressIndicator *)simageView.sd_imageIndicator.indicatorView).doubleValue / 100;
+#endif
+                     // Finish progress is 1
+                     expect(progress).equal(1);
+                     [expectation fulfill];
+                 }];
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)testUIViewOperationKeyContextWorks {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"UIView operation key context should pass through"];
+    
+    UIView *view = [[UIView alloc] init];
+    NSURL *originalImageURL = [NSURL URLWithString:kTestJPEGURL];
+    SDWebImageManager *customManager = [[SDWebImageManager alloc] initWithCache:SDImageCachesManager.sharedManager loader:SDImageLoadersManager.sharedManager];
+    customManager.optionsProcessor = [SDWebImageOptionsProcessor optionsProcessorWithBlock:^SDWebImageOptionsResult * _Nullable(NSURL * _Nullable url, SDWebImageOptions options, SDWebImageContext * _Nullable context) {
+        // expect manager does not exist, avoid retain cycle
+        expect(context[SDWebImageContextCustomManager]).beNil();
+        // expect operation key to be the image view class
+        expect(context[SDWebImageContextSetImageOperationKey]).equal(NSStringFromClass(view.class));
+        return [[SDWebImageOptionsResult alloc] initWithOptions:options context:context];
+    }];
+    [view sd_internalSetImageWithURL:originalImageURL
+                    placeholderImage:nil
+                             options:0
+                             context:@{SDWebImageContextCustomManager: customManager}
+                       setImageBlock:nil
+                            progress:nil
+                           completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+        [expectation fulfill];
+    }];
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+// test url is nil
+- (void)testUIViewImageUrlForNilWorks {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Completion is called with url is nil"];
+    UIImageView *imageView = [[UIImageView alloc] init];
+    SDImageCache *cache = [[SDImageCache alloc] initWithNamespace:@"Test"];
+    cache.config.shouldUseWeakMemoryCache = YES;
+    SDWebImageManager *imageManager = [[SDWebImageManager alloc] initWithCache:cache loader:[SDWebImageDownloader sharedDownloader]];
+    [imageView sd_setImageWithURL:nil placeholderImage:nil options:0 context:@{SDWebImageContextCustomManager:imageManager} progress:nil completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+        expect(image).to.beNil();
+        [expectation fulfill];
+    }];
+    [self waitForExpectationsWithCommonTimeout];
+    
+}
+
+// test url is NSString.
+- (void)testUIViewImageUrlForStringWorks {
+
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Completion is called with url is NSString"];
+    
+    UIImageView *imageView = [[UIImageView alloc] init];
+    SDImageCache *cache = [[SDImageCache alloc] initWithNamespace:@"Test"];
+    cache.config.shouldUseWeakMemoryCache = YES;
+    SDWebImageManager *imageManager = [[SDWebImageManager alloc] initWithCache:cache loader:[SDWebImageDownloader sharedDownloader]];
+    [imageView sd_setImageWithURL:(NSURL *)kTestJPEGURL placeholderImage:nil options:0 context:@{SDWebImageContextCustomManager:imageManager} progress:nil completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+        expect(image).notTo.beNil();
+        [expectation fulfill];
+    }];
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+// test url is NSURL
+- (void)testUIViewImageUrlForNSURLWorks {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Completion is called with url is NSURL"];
+    UIImageView *imageView = [[UIImageView alloc] init];
+    SDImageCache *cache = [[SDImageCache alloc] initWithNamespace:@"Test"];
+    cache.config.shouldUseWeakMemoryCache = YES;
+    SDWebImageManager *imageManager = [[SDWebImageManager alloc] initWithCache:cache loader:[SDWebImageDownloader sharedDownloader]];
+    [imageView sd_setImageWithURL:[NSURL URLWithString:kTestJPEGURL] placeholderImage:nil options:0 context:@{SDWebImageContextCustomManager:imageManager} progress:nil completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
+        expect(image).notTo.beNil();
+        [expectation fulfill];
+    }];
+    [self waitForExpectationsWithCommonTimeout];
+    
+}
+
+#pragma mark - Helper
+
+- (NSString *)testJPEGPath {
+    NSBundle *testBundle = [NSBundle bundleForClass:[self class]];
+    return [testBundle pathForResource:@"TestImage" ofType:@"jpg"];
+}
+
+#if SD_UIKIT
+- (NSString *)testBackgroundImageOperationKeyForState:(UIControlState)state {
+    return [NSString stringWithFormat:@"UIButtonBackgroundImageOperation%lu", (unsigned long)state];
+}
+#endif
+
+@end
diff --git a/Tests/Tests/SDWebImageDecoderTests.m b/Tests/Tests/SDWebImageDecoderTests.m
deleted file mode 100644
index c6385c31d..000000000
--- a/Tests/Tests/SDWebImageDecoderTests.m
+++ /dev/null
@@ -1,146 +0,0 @@
-/*
- * This file is part of the SDWebImage package.
- * (c) Olivier Poitrey <rs@dailymotion.com>
- * (c) Matt Galloway
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#import "SDTestCase.h"
-#import <SDWebImage/SDWebImageImageIOCoder.h>
-#import <SDWebImage/SDWebImageWebPCoder.h>
-#import <SDWebImage/UIImage+ForceDecode.h>
-#import <SDWebImage/SDWebImageGIFCoder.h>
-#import <SDWebImage/NSData+ImageContentType.h>
-
-@interface SDWebImageDecoderTests : SDTestCase
-
-@end
-
-@implementation SDWebImageDecoderTests
-
-- (void)test01ThatDecodedImageWithNilImageReturnsNil {
-    expect([UIImage decodedImageWithImage:nil]).to.beNil();
-}
-
-- (void)test02ThatDecodedImageWithImageWorksWithARegularJPGImage {
-    NSString * testImagePath = [[NSBundle bundleForClass:[self class]] pathForResource:@"TestImage" ofType:@"jpg"];
-    UIImage *image = [UIImage imageWithContentsOfFile:testImagePath];
-    UIImage *decodedImage = [UIImage decodedImageWithImage:image];
-    expect(decodedImage).toNot.beNil();
-    expect(decodedImage).toNot.equal(image);
-    expect(decodedImage.size.width).to.equal(image.size.width);
-    expect(decodedImage.size.height).to.equal(image.size.height);
-}
-
-- (void)test03ThatDecodedImageWithImageDoesNotDecodeAnimatedImages {
-    NSString * testImagePath = [[NSBundle bundleForClass:[self class]] pathForResource:@"TestImage" ofType:@"gif"];
-    UIImage *image = [UIImage imageWithContentsOfFile:testImagePath];
-    UIImage *animatedImage = [UIImage animatedImageWithImages:@[image] duration:0];
-    UIImage *decodedImage = [UIImage decodedImageWithImage:animatedImage];
-    expect(decodedImage).toNot.beNil();
-    expect(decodedImage).to.equal(animatedImage);
-}
-
-- (void)test04ThatDecodedImageWithImageWorksWithAlphaImages {
-    NSString * testImagePath = [[NSBundle bundleForClass:[self class]] pathForResource:@"TestImage" ofType:@"png"];
-    UIImage *image = [UIImage imageWithContentsOfFile:testImagePath];
-    UIImage *decodedImage = [UIImage decodedImageWithImage:image];
-    expect(decodedImage).toNot.beNil();
-    expect(decodedImage).toNot.equal(image);
-}
-
-- (void)test05ThatDecodedImageWithImageWorksEvenWithMonochromeImage {
-    NSString * testImagePath = [[NSBundle bundleForClass:[self class]] pathForResource:@"MonochromeTestImage" ofType:@"jpg"];
-    UIImage *image = [UIImage imageWithContentsOfFile:testImagePath];
-    UIImage *decodedImage = [UIImage decodedImageWithImage:image];
-    expect(decodedImage).toNot.beNil();
-    expect(decodedImage).toNot.equal(image);
-    expect(decodedImage.size.width).to.equal(image.size.width);
-    expect(decodedImage.size.height).to.equal(image.size.height);
-}
-
-- (void)test06ThatDecodeAndScaleDownImageWorks {
-    NSString * testImagePath = [[NSBundle bundleForClass:[self class]] pathForResource:@"TestImageLarge" ofType:@"jpg"];
-    UIImage *image = [UIImage imageWithContentsOfFile:testImagePath];
-    UIImage *decodedImage = [UIImage decodedAndScaledDownImageWithImage:image];
-    expect(decodedImage).toNot.beNil();
-    expect(decodedImage).toNot.equal(image);
-    expect(decodedImage.size.width).toNot.equal(image.size.width);
-    expect(decodedImage.size.height).toNot.equal(image.size.height);
-    expect(decodedImage.size.width * decodedImage.size.height).to.beLessThanOrEqualTo(60 * 1024 * 1024 / 4);    // how many pixels in 60 megs
-}
-
-- (void)test07ThatDecodeAndScaleDownImageDoesNotScaleSmallerImage {
-    NSString * testImagePath = [[NSBundle bundleForClass:[self class]] pathForResource:@"TestImage" ofType:@"jpg"];
-    UIImage *image = [UIImage imageWithContentsOfFile:testImagePath];
-    UIImage *decodedImage = [UIImage decodedAndScaledDownImageWithImage:image];
-    expect(decodedImage).toNot.beNil();
-    expect(decodedImage).toNot.equal(image);
-    expect(decodedImage.size.width).to.equal(image.size.width);
-    expect(decodedImage.size.height).to.equal(image.size.height);
-}
-
-- (void)test09ThatStaticWebPCoderWorks {
-    NSURL *staticWebPURL = [[NSBundle bundleForClass:[self class]] URLForResource:@"TestImageStatic" withExtension:@"webp"];
-    [self verifyCoder:[SDWebImageWebPCoder sharedCoder]
-    withLocalImageURL:staticWebPURL
-      isAnimatedImage:NO];
-}
-
-- (void)test10ThatAnimatedWebPCoderWorks {
-    NSURL *animatedWebPURL = [[NSBundle bundleForClass:[self class]] URLForResource:@"TestImageAnimated" withExtension:@"webp"];
-    [self verifyCoder:[SDWebImageWebPCoder sharedCoder]
-    withLocalImageURL:animatedWebPURL
-      isAnimatedImage:YES];
-}
-
-- (void)test20ThatOurGIFCoderWorksNotFLAnimatedImage {
-    NSURL *gifURL = [[NSBundle bundleForClass:[self class]] URLForResource:@"TestImage" withExtension:@"gif"];
-    [self verifyCoder:[SDWebImageGIFCoder sharedCoder]
-    withLocalImageURL:gifURL
-      isAnimatedImage:YES];
-}
-
-- (void)verifyCoder:(id<SDWebImageCoder>)coder
-  withLocalImageURL:(NSURL *)imageUrl
-    isAnimatedImage:(BOOL)isAnimated {
-    NSData *inputImageData = [NSData dataWithContentsOfURL:imageUrl];
-    expect(inputImageData).toNot.beNil();
-    SDImageFormat inputImageFormat = [NSData sd_imageFormatForImageData:inputImageData];
-    expect(inputImageFormat).toNot.equal(SDImageFormatUndefined);
-    
-    // 1 - check if we can decode - should be true
-    expect([coder canDecodeFromData:inputImageData]).to.beTruthy();
-    
-    // 2 - decode from NSData to UIImage and check it
-    UIImage *inputImage = [coder decodedImageWithData:inputImageData];
-    expect(inputImage).toNot.beNil();
-    
-    if (isAnimated) {
-        // 2a - check images count > 0 (only for animated images)
-        expect(inputImage.images.count).to.beGreaterThan(0);
-        
-        // 2b - check image size and scale for each frameImage (only for animated images)
-        CGSize imageSize = inputImage.size;
-        CGFloat imageScale = inputImage.scale;
-        [inputImage.images enumerateObjectsUsingBlock:^(UIImage * frameImage, NSUInteger idx, BOOL * stop) {
-            expect(imageSize).to.equal(frameImage.size);
-            expect(imageScale).to.equal(frameImage.scale);
-        }];
-    }
-    
-    // 3 - check if we can encode to the original format
-    expect([coder canEncodeToFormat:inputImageFormat]).to.beTruthy();
-    
-    // 4 - encode from UIImage to NSData using the inputImageFormat and check it
-    NSData *outputImageData = [coder encodedDataWithImage:inputImage format:inputImageFormat];
-    expect(outputImageData).toNot.beNil();
-    UIImage *outputImage = [coder decodedImageWithData:outputImageData];
-    expect(outputImage.size).to.equal(inputImage.size);
-    expect(outputImage.scale).to.equal(inputImage.scale);
-    expect(outputImage.images.count).to.equal(inputImage.images.count);
-}
-
-@end
diff --git a/Tests/Tests/SDWebImageDownloaderTests.m b/Tests/Tests/SDWebImageDownloaderTests.m
index 80f1282f9..7ec548c5a 100644
--- a/Tests/Tests/SDWebImageDownloaderTests.m
+++ b/Tests/Tests/SDWebImageDownloaderTests.m
@@ -8,54 +8,29 @@
  */
 
 #import "SDTestCase.h"
-#import <SDWebImage/SDWebImageDownloader.h>
-#import <SDWebImage/SDWebImageDownloaderOperation.h>
-#import <SDWebImage/SDWebImageCodersManager.h>
-#import "SDWebImageTestDecoder.h"
+#import "SDWebImageTestDownloadOperation.h"
+#import "SDWebImageTestCoder.h"
+#import "SDWebImageTestLoader.h"
+#import <compression.h>
 
-/**
- *  Category for SDWebImageDownloader so we can access the operationClass
- */
-@interface SDWebImageDownloader ()
-@property (assign, nonatomic, nullable) Class operationClass;
-@property (strong, nonatomic, nonnull) NSOperationQueue *downloadQueue;
-
-- (NSOperation<SDWebImageDownloaderOperationInterface> *)createDownloaderOperationWithUrl:(nullable NSURL *)url options:(SDWebImageDownloaderOptions)options;
-
-@end
+#define kPlaceholderTestURLTemplate @"https://placehold.co/10000x%d.png"
 
 /**
- *  A class that fits the NSOperation+SDWebImageDownloaderOperationInterface requirement so we can test
+ *  Category for SDWebImageDownloader so we can access the operationClass
  */
-@interface CustomDownloaderOperation : NSOperation<SDWebImageDownloaderOperationInterface>
-
-@property (nonatomic, assign) BOOL shouldDecompressImages;
-@property (nonatomic, strong, nullable) NSURLCredential *credential;
-
+@interface SDWebImageDownloadToken ()
+@property (nonatomic, weak, nullable) NSOperation<SDWebImageDownloaderOperation> *downloadOperation;
 @end
 
-@implementation CustomDownloaderOperation
-
-- (nonnull instancetype)initWithRequest:(nullable NSURLRequest *)req inSession:(nullable NSURLSession *)ses options:(SDWebImageDownloaderOptions)opt {
-    if ((self = [super init])) { }
-    return self;
-}
-
-- (nullable id)addHandlersForProgress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
-                            completed:(nullable SDWebImageDownloaderCompletedBlock)completedBlock {
-    return nil;
-}
-
-- (BOOL)cancel:(id)token {
-    return YES;
-}
-
+@interface SDWebImageDownloader ()
+@property (strong, nonatomic, nonnull) NSOperationQueue *downloadQueue;
 @end
 
 
-
 @interface SDWebImageDownloaderTests : SDTestCase
 
+@property (nonatomic, strong) NSMutableArray<NSURL *> *executionOrderURLs;
+
 @end
 
 @implementation SDWebImageDownloaderTests
@@ -67,7 +42,7 @@ - (void)test01ThatSharedDownloaderIsNotEqualToInitDownloader {
 }
 
 - (void)test02ThatByDefaultDownloaderSetsTheAcceptHTTPHeader {
-    expect([[SDWebImageDownloader sharedDownloader] valueForHTTPHeaderField:@"Accept"]).to.match(@"image/\\*");
+    expect([[SDWebImageDownloader sharedDownloader] valueForHTTPHeaderField:@"Accept"]).to.match(@"image/\\*,\\*/\\*;q=0.8");
 }
 
 - (void)test03ThatSetAndGetValueForHTTPHeaderFieldWork {
@@ -83,48 +58,66 @@ - (void)test03ThatSetAndGetValueForHTTPHeaderFieldWork {
 
 - (void)test04ThatASimpleDownloadWorks {
     XCTestExpectation *expectation = [self expectationWithDescription:@"Simple download"];
-    NSURL *imageURL = [NSURL URLWithString:kTestJpegURL];
+    NSURL *imageURL = [NSURL URLWithString:kTestJPEGURL];
     [[SDWebImageDownloader sharedDownloader] downloadImageWithURL:imageURL options:0 progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
         if (image && data && !error && finished) {
             [expectation fulfill];
         } else {
-            XCTFail(@"Something went wrong");
+            XCTFail(@"Something went wrong: %@", error.description);
         }
     }];
     [self waitForExpectationsWithCommonTimeout];
 }
 
 - (void)test05ThatSetAndGetMaxConcurrentDownloadsWorks {
-    NSInteger initialValue = [SDWebImageDownloader sharedDownloader].maxConcurrentDownloads;
+    NSInteger initialValue = SDWebImageDownloader.sharedDownloader.config.maxConcurrentDownloads;
     
-    [[SDWebImageDownloader sharedDownloader] setMaxConcurrentDownloads:3];
-    expect([SDWebImageDownloader sharedDownloader].maxConcurrentDownloads).to.equal(3);
+    SDWebImageDownloader.sharedDownloader.config.maxConcurrentDownloads = 3;
+    expect(SDWebImageDownloader.sharedDownloader.config.maxConcurrentDownloads).to.equal(3);
     
-    [[SDWebImageDownloader sharedDownloader] setMaxConcurrentDownloads:initialValue];
+    SDWebImageDownloader.sharedDownloader.config.maxConcurrentDownloads = initialValue;
 }
 
 - (void)test06ThatUsingACustomDownloaderOperationWorks {
+    SDWebImageDownloader *downloader = [[SDWebImageDownloader alloc] initWithConfig:nil];
+    NSURL *imageURL1 = [NSURL URLWithString:kTestJPEGURL];
+    NSURL *imageURL2 = [NSURL URLWithString:kTestPNGURL];
+    NSURL *imageURL3 = [NSURL URLWithString:kTestGIFURL];
     // we try to set a usual NSOperation as operation class. Should not work
-    [[SDWebImageDownloader sharedDownloader] setOperationClass:[NSOperation class]];
-    expect([SDWebImageDownloader sharedDownloader].operationClass).to.equal([SDWebImageDownloaderOperation class]);
+    @try {
+        downloader.config.operationClass = [NSOperation class];
+    } @catch (NSException *exception) {
+        expect(exception).notTo.beNil();
+    }
+    SDWebImageDownloadToken *token = [downloader downloadImageWithURL:imageURL1 options:0 progress:nil completed:nil];
+    NSOperation<SDWebImageDownloaderOperation> *operation = token.downloadOperation;
+    expect([operation class]).to.equal([SDWebImageDownloaderOperation class]);
     
-    // setting an NSOperation subclass that conforms to SDWebImageDownloaderOperationInterface - should work
-    [[SDWebImageDownloader sharedDownloader] setOperationClass:[CustomDownloaderOperation class]];
-    expect([SDWebImageDownloader sharedDownloader].operationClass).to.equal([CustomDownloaderOperation class]);
+    // setting an NSOperation subclass that conforms to SDWebImageDownloaderOperation - should work
+    downloader.config.operationClass = [SDWebImageTestDownloadOperation class];
+    token = [downloader downloadImageWithURL:imageURL2 options:0 progress:nil completed:nil];
+    operation = token.downloadOperation;
+    expect([operation class]).to.equal([SDWebImageTestDownloadOperation class]);
+    
+    // Assert the NSOperation conforms to `SDWebImageOperation`
+    expect([NSOperation.class conformsToProtocol:@protocol(SDWebImageOperation)]).beTruthy();
+    expect([operation conformsToProtocol:@protocol(SDWebImageOperation)]).beTruthy();
     
     // back to the original value
-    [[SDWebImageDownloader sharedDownloader] setOperationClass:nil];
-    expect([SDWebImageDownloader sharedDownloader].operationClass).to.equal([SDWebImageDownloaderOperation class]);
+    downloader.config.operationClass = nil;
+    token = [downloader downloadImageWithURL:imageURL3 options:0 progress:nil completed:nil];
+    operation = token.downloadOperation;
+    expect([operation class]).to.equal([SDWebImageDownloaderOperation class]);
+    
+    [downloader invalidateSessionAndCancel:YES];
 }
 
 - (void)test07ThatDownloadImageWithNilURLCallsCompletionWithNils {
-    expect([[SDWebImageDownloader sharedDownloader] createDownloaderOperationWithUrl:nil options:0]).toNot.beNil();
-    
     XCTestExpectation *expectation = [self expectationWithDescription:@"Completion is called with nils"];
     [[SDWebImageDownloader sharedDownloader] downloadImageWithURL:nil options:0 progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
         expect(image).to.beNil();
         expect(data).to.beNil();
-        expect(error).to.beNil();
+        expect(error.code).equal(SDWebImageErrorInvalidURL);
         [expectation fulfill];
     }];
     [self waitForExpectationsWithCommonTimeout];
@@ -132,29 +125,31 @@ - (void)test07ThatDownloadImageWithNilURLCallsCompletionWithNils {
 
 - (void)test08ThatAHTTPAuthDownloadWorks {
     XCTestExpectation *expectation = [self expectationWithDescription:@"HTTP Auth download"];
-    [SDWebImageDownloader sharedDownloader].username = @"httpwatch";
-    [SDWebImageDownloader sharedDownloader].password = @"httpwatch01";
+    SDWebImageDownloaderConfig *config = SDWebImageDownloaderConfig.defaultDownloaderConfig;
+    config.username = @"httpwatch";
+    config.password = @"httpwatch01";
+    SDWebImageDownloader *downloader = [[SDWebImageDownloader alloc] initWithConfig:config];
     NSURL *imageURL = [NSURL URLWithString:@"http://www.httpwatch.com/httpgallery/authentication/authenticatedimage/default.aspx?0.35786508303135633"];
-    [[SDWebImageDownloader sharedDownloader] downloadImageWithURL:imageURL options:0 progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
+    [downloader downloadImageWithURL:imageURL options:0 progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
         if (image && data && !error && finished) {
             [expectation fulfill];
         } else {
-            XCTFail(@"Something went wrong");
+            XCTFail(@"Something went wrong: %@", error.description);
         }
     }];
-    [self waitForExpectationsWithCommonTimeout];
-    [SDWebImageDownloader sharedDownloader].username = nil;
-    [SDWebImageDownloader sharedDownloader].password = nil;
+    [self waitForExpectationsWithCommonTimeoutUsingHandler:^(NSError * _Nullable error) {
+        [downloader invalidateSessionAndCancel:YES];
+    }];
 }
 
 - (void)test09ThatProgressiveJPEGWorks {
     XCTestExpectation *expectation = [self expectationWithDescription:@"Progressive JPEG download"];
-    NSURL *imageURL = [NSURL URLWithString:kTestJpegURL];
-    [[SDWebImageDownloader sharedDownloader] downloadImageWithURL:imageURL options:SDWebImageDownloaderProgressiveDownload progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
+    NSURL *imageURL = [NSURL URLWithString:kTestProgressiveJPEGURL];
+    [[SDWebImageDownloader sharedDownloader] downloadImageWithURL:imageURL options:SDWebImageDownloaderProgressiveLoad progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
         if (image && data && !error && finished) {
             [expectation fulfill];
         } else if (finished) {
-            XCTFail(@"Something went wrong");
+            XCTFail(@"Something went wrong: %@", error.description);
         } else {
             // progressive updates
         }
@@ -170,7 +165,7 @@ - (void)test10That404CaseCallsCompletionWithError {
         if (!image && !data && error && finished) {
             [expectation fulfill];
         } else {
-            XCTFail(@"Something went wrong");
+            XCTFail(@"Something went wrong: %@", error.description);
         }
     }];
     [self waitForExpectationsWithCommonTimeout];
@@ -179,14 +174,37 @@ - (void)test10That404CaseCallsCompletionWithError {
 - (void)test11ThatCancelWorks {
     XCTestExpectation *expectation = [self expectationWithDescription:@"Cancel"];
     
-    NSURL *imageURL = [NSURL URLWithString:kTestJpegURL];
+    NSURL *imageURL = [NSURL URLWithString:@"https://placehold.co/1000x1000.png"];
     SDWebImageDownloadToken *token = [[SDWebImageDownloader sharedDownloader]
                                       downloadImageWithURL:imageURL options:0 progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
-                                          XCTFail(@"Should not get here");
+                                          expect(error).notTo.beNil();
+                                          expect(error.domain).equal(SDWebImageErrorDomain);
+                                          expect(error.code).equal(SDWebImageErrorCancelled);
                                       }];
     expect([SDWebImageDownloader sharedDownloader].currentDownloadCount).to.equal(1);
     
-    [[SDWebImageDownloader sharedDownloader] cancel:token];
+    [token cancel];
+    
+    // doesn't cancel immediately - since it uses dispatch async
+    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, kMinDelayNanosecond), dispatch_get_main_queue(), ^{
+        expect([SDWebImageDownloader sharedDownloader].currentDownloadCount).to.equal(0);
+        [expectation fulfill];
+    });
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test11ThatCancelAllDownloadWorks {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"CancelAllDownloads"];
+    // Previous test case download may not finished, so we just check the download count should + 1 after new request
+    NSUInteger currentDownloadCount = [SDWebImageDownloader sharedDownloader].currentDownloadCount;
+    
+    // Choose a large image to avoid download too fast
+    NSURL *imageURL = [NSURL URLWithString:@"https://www.sample-videos.com/img/Sample-png-image-1mb.png"];
+    [[SDWebImageDownloader sharedDownloader] downloadImageWithURL:imageURL completed:nil];
+    expect([SDWebImageDownloader sharedDownloader].currentDownloadCount).to.equal(currentDownloadCount + 1);
+    
+    [[SDWebImageDownloader sharedDownloader] cancelAllDownloads];
     
     // doesn't cancel immediately - since it uses dispatch async
     dispatch_after(dispatch_time(DISPATCH_TIME_NOW, kMinDelayNanosecond), dispatch_get_main_queue(), ^{
@@ -199,9 +217,9 @@ - (void)test11ThatCancelWorks {
 
 - (void)test12ThatWeCanUseAnotherSessionForEachDownloadOperation {
     XCTestExpectation *expectation = [self expectationWithDescription:@"Owned session"];
-    NSURL *imageURL = [NSURL URLWithString:kTestJpegURL];
+    NSURL *url = [NSURL URLWithString:kTestJPEGURL];
     
-    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:imageURL cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:15];
+    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:15];
     request.HTTPShouldUsePipelining = YES;
     request.allHTTPHeaderFields = @{@"Accept": @"image/*;q=0.8"};
     
@@ -214,7 +232,7 @@ - (void)test12ThatWeCanUseAnotherSessionForEachDownloadOperation {
         if (image && data && !error && finished) {
             [expectation fulfill];
         } else {
-            XCTFail(@"Something went wrong");
+            XCTFail(@"Something went wrong: %@", error.description);
         }
     }];
     
@@ -225,12 +243,12 @@ - (void)test12ThatWeCanUseAnotherSessionForEachDownloadOperation {
 
 - (void)test13ThatDownloadCanContinueWhenTheAppEntersBackground {
     XCTestExpectation *expectation = [self expectationWithDescription:@"Simple download"];
-    NSURL *imageURL = [NSURL URLWithString:kTestJpegURL];
+    NSURL *imageURL = [NSURL URLWithString:kTestJPEGURL];
     [[SDWebImageDownloader sharedDownloader] downloadImageWithURL:imageURL options:SDWebImageDownloaderContinueInBackground progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
         if (image && data && !error && finished) {
             [expectation fulfill];
         } else {
-            XCTFail(@"Something went wrong");
+            XCTFail(@"Something went wrong: %@", error.description);
         }
     }];
     [self waitForExpectationsWithCommonTimeout];
@@ -243,33 +261,141 @@ - (void)test14ThatPNGWorks {
         if (image && data && !error && finished) {
             [expectation fulfill];
         } else {
-            XCTFail(@"Something went wrong");
+            XCTFail(@"Something went wrong: %@", error.description);
         }
     }];
     [self waitForExpectationsWithCommonTimeout];
 }
 
-- (void)test15ThatWEBPWorks {
-    XCTestExpectation *expectation = [self expectationWithDescription:@"WEBP"];
-    NSURL *imageURL = [NSURL URLWithString:@"http://www.ioncannon.net/wp-content/uploads/2011/06/test2.webp"];
-    [[SDWebImageDownloader sharedDownloader] downloadImageWithURL:imageURL options:0 progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
+- (void)test15DownloaderLIFOExecutionOrder {
+    SDWebImageDownloaderConfig *config = [[SDWebImageDownloaderConfig alloc] init];
+    config.executionOrder = SDWebImageDownloaderLIFOExecutionOrder; // Last In First Out
+    config.maxConcurrentDownloads = 1; // 1
+    SDWebImageDownloader *downloader = [[SDWebImageDownloader alloc] initWithConfig:config];
+    self.executionOrderURLs = [NSMutableArray array];
+    
+    // Input order: 1 -> 2 -> 3 -> 4 -> 5 -> 6 -> 7 (wait for 7 started and immediately) -> 8 -> 9 -> 10 -> 11 -> 12 -> 13 -> 14
+    // Expected result: 1 (first one has no dependency) -> 7 -> 14 -> 13 -> 12 -> 11 -> 10 -> 9 -> 8 -> 6 -> 5 -> 4 -> 3 -> 2
+    int waitIndex = 7;
+    int maxIndex = 14;
+    NSMutableArray<XCTestExpectation *> *expectations = [NSMutableArray array];
+    for (int i = 1; i <= maxIndex; i++) {
+        XCTestExpectation *expectation = [self expectationWithDescription:[NSString stringWithFormat:@"URL %d order wrong", i]];
+        [expectations addObject:expectation];
+    }
+    
+    for (int i = 1; i <= waitIndex; i++) {
+        [self createLIFOOperationWithDownloader:downloader expectation:expectations[i-1] index:i];
+    }
+    [[NSNotificationCenter defaultCenter] addObserverForName:SDWebImageDownloadStartNotification object:nil queue:nil usingBlock:^(NSNotification * _Nonnull note) {
+        SDWebImageDownloaderOperation *operation = note.object;
+        NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:kPlaceholderTestURLTemplate, waitIndex]];
+        if (![operation.request.URL isEqual:url]) {
+            return;
+        }
+        for (int i = waitIndex + 1; i <= maxIndex; i++) {
+            [self createLIFOOperationWithDownloader:downloader expectation:expectations[i-1] index:i];
+        }
+    }];
+    
+    [self waitForExpectationsWithTimeout:kAsyncTestTimeout * maxIndex handler:nil];
+}
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wshadow"
+- (void)createLIFOOperationWithDownloader:(SDWebImageDownloader *)downloader expectation:(XCTestExpectation *)expectation index:(int)index {
+    int waitIndex = 7;
+    int maxIndex = 14;
+    NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:kPlaceholderTestURLTemplate, index]];
+    [self.executionOrderURLs addObject:url];
+    [downloader downloadImageWithURL:url options:0 progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
+        printf("URL%d finished\n", index);
+        NSMutableArray *pendingArray = [NSMutableArray array];
+        if (index == 1) {
+            // 1
+            for (int j = 1; j <= waitIndex; j++) {
+                NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:kPlaceholderTestURLTemplate, j]];
+                [pendingArray addObject:url];
+            }
+        } else if (index == waitIndex) {
+            // 7
+            for (int j = 2; j <= maxIndex; j++) {
+                NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:kPlaceholderTestURLTemplate, j]];
+                [pendingArray addObject:url];
+            }
+        } else if (index > waitIndex) {
+            // 8-14
+            for (int j = 2; j <= index; j++) {
+                if (j == waitIndex) continue;
+                NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:kPlaceholderTestURLTemplate, j]];
+                [pendingArray addObject:url];
+            }
+        } else if (index < waitIndex) {
+            // 2-6
+            for (int j = 2; j <= index; j++) {
+                if (j == waitIndex) continue;
+                NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:kPlaceholderTestURLTemplate, j]];
+                [pendingArray addObject:url];
+            }
+        }
+        expect(self.executionOrderURLs).equal(pendingArray);
+        NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:kPlaceholderTestURLTemplate, index]];
+        [self.executionOrderURLs removeObject:url];
+        [expectation fulfill];
+    }];
+}
+#pragma clang diagnostic pop
+
+- (void)test17ThatMinimumProgressIntervalWorks {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Minimum progress interval"];
+    SDWebImageDownloaderConfig *config = SDWebImageDownloaderConfig.defaultDownloaderConfig;
+    config.minimumProgressInterval = 0.51; // This will make the progress only callback at most 4 times (-1, 0%, 51%, 100%)
+    SDWebImageDownloader *downloader = [[SDWebImageDownloader alloc] initWithConfig:config];
+    NSURL *imageURL = [NSURL URLWithString:@"https://raw.githubusercontent.com/recurser/exif-orientation-examples/master/Landscape_1.jpg"];
+    __block NSUInteger allProgressCount = 0; // All progress (including operation start / first HTTP response, etc)
+    __block BOOL completed = NO;
+    [downloader downloadImageWithURL:imageURL options:0 progress:^(NSInteger receivedSize, NSInteger expectedSize, NSURL * _Nullable targetURL) {
+        allProgressCount++;
+    } completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
+        if (completed) {
+            return;
+        }
+        if (allProgressCount > 0) {
+            [expectation fulfill];
+            completed = YES;
+        } else {
+            XCTFail(@"Completed callback before progress update");
+        }
+    }];
+     
+    [self waitForExpectationsWithCommonTimeoutUsingHandler:^(NSError * _Nullable error) {
+        [downloader invalidateSessionAndCancel:YES];
+    }];
+}
+
+- (void)test18ThatProgressiveGIFWorks {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Progressive GIF download"];
+    NSURL *imageURL = [NSURL URLWithString:kTestGIFURL];
+    [[SDWebImageDownloader sharedDownloader] downloadImageWithURL:imageURL options:SDWebImageDownloaderProgressiveLoad progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
         if (image && data && !error && finished) {
             [expectation fulfill];
+        } else if (finished) {
+            XCTFail(@"Something went wrong: %@", error.description);
         } else {
-            XCTFail(@"Something went wrong");
+            // progressive updates
         }
     }];
     [self waitForExpectationsWithCommonTimeout];
 }
 
-- (void)test16ThatProgressiveWebPWorks {
-    XCTestExpectation *expectation = [self expectationWithDescription:@"Progressive WebP download"];
-    NSURL *imageURL = [NSURL URLWithString:@"http://www.ioncannon.net/wp-content/uploads/2011/06/test9.webp"];
-    [[SDWebImageDownloader sharedDownloader] downloadImageWithURL:imageURL options:SDWebImageDownloaderProgressiveDownload progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
+- (void)test19ThatProgressiveAPNGWorks {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Progressive APNG download"];
+    NSURL *imageURL = [NSURL URLWithString:kTestAPNGPURL];
+    [[SDWebImageDownloader sharedDownloader] downloadImageWithURL:imageURL options:SDWebImageDownloaderProgressiveLoad progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
         if (image && data && !error && finished) {
             [expectation fulfill];
         } else if (finished) {
-            XCTFail(@"Something went wrong");
+            XCTFail(@"Something went wrong: %@", error.description);
         } else {
             // progressive updates
         }
@@ -286,14 +412,15 @@ - (void)test16ThatProgressiveWebPWorks {
 - (void)test20ThatDownloadingSameURLTwiceAndCancellingFirstWorks {
     XCTestExpectation *expectation = [self expectationWithDescription:@"Correct image downloads"];
     
-    NSURL *imageURL = [NSURL URLWithString:kTestJpegURL];
+    NSURL *imageURL = [NSURL URLWithString:kTestJPEGURL];
     
     SDWebImageDownloadToken *token1 = [[SDWebImageDownloader sharedDownloader]
                                        downloadImageWithURL:imageURL
                                        options:0
                                        progress:nil
                                        completed:^(UIImage *image, NSData *data, NSError *error, BOOL finished) {
-                                           XCTFail(@"Shouldn't have completed here.");
+                                           expect(error).notTo.beNil();
+                                           expect(error.code).equal(SDWebImageErrorCancelled);
                                        }];
     expect(token1).toNot.beNil();
     
@@ -305,13 +432,13 @@ - (void)test20ThatDownloadingSameURLTwiceAndCancellingFirstWorks {
                                            if (image && data && !error && finished) {
                                                [expectation fulfill];
                                            } else {
-                                               XCTFail(@"Something went wrong");
+                                               XCTFail(@"Something went wrong: %@", error.description);
                                            }
                                        }];
     expect(token2).toNot.beNil();
-    
-    [[SDWebImageDownloader sharedDownloader] cancel:token1];
-    
+
+    [token1 cancel];
+
     [self waitForExpectationsWithCommonTimeout];
 }
 
@@ -324,18 +451,19 @@ - (void)test20ThatDownloadingSameURLTwiceAndCancellingFirstWorks {
 - (void)test21ThatCancelingDownloadThenRequestingAgainWorks {
     XCTestExpectation *expectation = [self expectationWithDescription:@"Correct image downloads"];
     
-    NSURL *imageURL = [NSURL URLWithString:kTestJpegURL];
+    NSURL *imageURL = [NSURL URLWithString:kTestJPEGURL];
     
     SDWebImageDownloadToken *token1 = [[SDWebImageDownloader sharedDownloader]
                                        downloadImageWithURL:imageURL
                                        options:0
                                        progress:nil
                                        completed:^(UIImage *image, NSData *data, NSError *error, BOOL finished) {
-                                           XCTFail(@"Shouldn't have completed here.");
+                                           expect(error).notTo.beNil();
+                                           expect(error.code).equal(SDWebImageErrorCancelled);
                                        }];
     expect(token1).toNot.beNil();
     
-    [[SDWebImageDownloader sharedDownloader] cancel:token1];
+    [token1 cancel];
     
     SDWebImageDownloadToken *token2 = [[SDWebImageDownloader sharedDownloader]
                                        downloadImageWithURL:imageURL
@@ -346,7 +474,7 @@ - (void)test21ThatCancelingDownloadThenRequestingAgainWorks {
                                                [expectation fulfill];
                                            } else {
                                                NSLog(@"image = %@, data = %@, error = %@", image, data, error);
-                                               XCTFail(@"Something went wrong");
+                                               XCTFail(@"Something went wrong: %@", error.description);
                                            }
                                        }];
     expect(token2).toNot.beNil();
@@ -357,26 +485,21 @@ - (void)test21ThatCancelingDownloadThenRequestingAgainWorks {
 - (void)test22ThatCustomDecoderWorksForImageDownload {
     XCTestExpectation *expectation = [self expectationWithDescription:@"Custom decoder for SDWebImageDownloader not works"];
     SDWebImageDownloader *downloader = [[SDWebImageDownloader alloc] init];
-    SDWebImageTestDecoder *testDecoder = [[SDWebImageTestDecoder alloc] init];
-    [[SDWebImageCodersManager sharedInstance] addCoder:testDecoder];
+    SDWebImageTestCoder *testDecoder = [[SDWebImageTestCoder alloc] init];
+    [[SDImageCodersManager sharedManager] addCoder:testDecoder];
     NSURL * testImageURL = [[NSBundle bundleForClass:[self class]] URLForResource:@"TestImage" withExtension:@"png"];
     
     // Decoded result is JPEG
     NSString *testJPEGImagePath = [[NSBundle bundleForClass:[self class]] pathForResource:@"TestImage" ofType:@"jpg"];
-    UIImage *testJPEGImage = [UIImage imageWithContentsOfFile:testJPEGImagePath];
+    UIImage *testJPEGImage = [[UIImage alloc] initWithContentsOfFile:testJPEGImagePath];
     
     [downloader downloadImageWithURL:testImageURL options:0 progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
-        NSData *data1 = UIImagePNGRepresentation(testJPEGImage);
-        NSData *data2 = UIImagePNGRepresentation(image);
+        NSData *data1 = [testJPEGImage sd_imageDataAsFormat:SDImageFormatPNG];
+        NSData *data2 = [image sd_imageDataAsFormat:SDImageFormatPNG];
         if (![data1 isEqualToData:data2]) {
             XCTFail(@"The image data is not equal to cutom decoder, check -[SDWebImageTestDecoder decodedImageWithData:]");
         }
-        NSString *str1 = @"TestDecompress";
-        NSString *str2 = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
-        if (![str1 isEqualToString:str2]) {
-            XCTFail(@"The image data is not modified by the custom decoder, check -[SDWebImageTestDecoder decompressedImageWithImage:data:options:]");
-        }
-        [[SDWebImageCodersManager sharedInstance] removeCoder:testDecoder];
+        [[SDImageCodersManager sharedManager] removeCoder:testDecoder];
         [expectation fulfill];
     }];
     
@@ -384,5 +507,405 @@ - (void)test22ThatCustomDecoderWorksForImageDownload {
     [downloader invalidateSessionAndCancel:YES];
 }
 
-@end
+- (void)test23ThatDownloadRequestModifierWorks {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Download request modifier not works"];
+    SDWebImageDownloader *downloader = [[SDWebImageDownloader alloc] init];
+    
+    // Test conveniences modifier
+    SDWebImageDownloaderRequestModifier *requestModifier = [[SDWebImageDownloaderRequestModifier alloc] initWithHeaders:@{@"Biz" : @"Bazz"}];
+    NSURLRequest *testRequest = [[NSURLRequest alloc] initWithURL:[NSURL URLWithString:kTestJPEGURL]];
+    testRequest = [requestModifier modifiedRequestWithRequest:testRequest];
+    expect(testRequest.allHTTPHeaderFields).equal(@{@"Biz" : @"Bazz"});
+    
+    requestModifier = [SDWebImageDownloaderRequestModifier requestModifierWithBlock:^NSURLRequest * _Nullable(NSURLRequest * _Nonnull request) {
+        if ([request.URL.absoluteString isEqualToString:kTestPNGURL]) {
+            // Test that return a modified request
+            NSMutableURLRequest *mutableRequest = [request mutableCopy];
+            [mutableRequest setValue:@"Bar" forHTTPHeaderField:@"Foo"];
+            NSURLComponents *components = [NSURLComponents componentsWithURL:mutableRequest.URL resolvingAgainstBaseURL:NO];
+            components.query = @"text=Hello+World";
+            mutableRequest.URL = components.URL;
+            return mutableRequest;
+        } else if ([request.URL.absoluteString isEqualToString:kTestJPEGURL]) {
+            // Test that return nil request will treat as error
+            return nil;
+        } else {
+            return request;
+        }
+    }];
+    downloader.requestModifier = requestModifier;
+    
+    __block BOOL firstCheck = NO;
+    __block BOOL secondCheck = NO;
+    
+    [downloader downloadImageWithURL:[NSURL URLWithString:kTestJPEGURL] options:0 progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
+        // Except error
+        expect(error).notTo.beNil();
+        firstCheck = YES;
+        if (firstCheck && secondCheck) {
+            [expectation fulfill];
+        }
+    }];
+    
+    [downloader downloadImageWithURL:[NSURL URLWithString:kTestPNGURL] options:0 progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
+        // Expect not error
+        expect(error).to.beNil();
+        secondCheck = YES;
+        if (firstCheck && secondCheck) {
+            [expectation fulfill];
+        }
+    }];
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
 
+- (void)test24ThatDownloadResponseModifierWorks {
+    XCTestExpectation *expectation1 = [self expectationWithDescription:@"Download response modifier for webURL"];
+    XCTestExpectation *expectation2 = [self expectationWithDescription:@"Download response modifier invalid response"];
+    
+    SDWebImageDownloader *downloader = [[SDWebImageDownloader alloc] init];
+    
+    // Test conveniences modifier
+    SDWebImageDownloaderResponseModifier *responseModifier = [[SDWebImageDownloaderResponseModifier alloc] initWithHeaders:@{@"Biz" : @"Bazz"}];
+    NSURLResponse *testResponse = [[NSHTTPURLResponse alloc] initWithURL:[NSURL URLWithString:kTestPNGURL] statusCode:404 HTTPVersion:@"HTTP/1.1" headerFields:nil];
+    testResponse = [responseModifier modifiedResponseWithResponse:testResponse];
+    expect(((NSHTTPURLResponse *)testResponse).allHeaderFields).equal(@{@"Biz" : @"Bazz"});
+    expect(((NSHTTPURLResponse *)testResponse).statusCode).equal(200);
+    
+    // 1. Test webURL to response custom status code and header
+    responseModifier = [SDWebImageDownloaderResponseModifier responseModifierWithBlock:^NSURLResponse * _Nullable(NSURLResponse * _Nonnull response) {
+        NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)response;
+        NSMutableDictionary *mutableHeaderFields = [httpResponse.allHeaderFields mutableCopy];
+        mutableHeaderFields[@"Foo"] = @"Bar";
+        NSHTTPURLResponse *modifiedResponse = [[NSHTTPURLResponse alloc] initWithURL:response.URL statusCode:404 HTTPVersion:nil headerFields:[mutableHeaderFields copy]];
+        return [modifiedResponse copy];
+    }];
+    downloader.responseModifier = responseModifier;
+    
+    __block SDWebImageDownloadToken *token;
+    token = [downloader downloadImageWithURL:[NSURL URLWithString:kTestJPEGURL] completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
+        expect(error).notTo.beNil();
+        expect(error.code).equal(SDWebImageErrorInvalidDownloadStatusCode);
+        expect(error.userInfo[SDWebImageErrorDownloadStatusCodeKey]).equal(404);
+        NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)token.response;
+        expect(httpResponse).notTo.beNil();
+        expect(httpResponse.allHeaderFields[@"Foo"]).equal(@"Bar");
+        [expectation1 fulfill];
+    }];
+    
+    // 2. Test nil response will cancel the download
+    responseModifier = [SDWebImageDownloaderResponseModifier responseModifierWithBlock:^NSURLResponse * _Nullable(NSURLResponse * _Nonnull response) {
+        return nil;
+    }];
+    [downloader downloadImageWithURL:[NSURL URLWithString:kTestPNGURL] options:0 context:@{SDWebImageContextDownloadResponseModifier : responseModifier} progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
+        expect(error).notTo.beNil();
+        expect(error.code).equal(SDWebImageErrorInvalidDownloadResponse);
+        [expectation2 fulfill];
+    }];
+    
+    [self waitForExpectationsWithCommonTimeoutUsingHandler:^(NSError * _Nullable error) {
+        [downloader invalidateSessionAndCancel:YES];
+    }];
+}
+
+- (void)test25ThatDownloadDecryptorWorks {
+    XCTestExpectation *expectation1 = [self expectationWithDescription:@"Download decryptor for fileURL"];
+    XCTestExpectation *expectation2 = [self expectationWithDescription:@"Download decryptor for webURL"];
+    XCTestExpectation *expectation3 = [self expectationWithDescription:@"Download decryptor invalid data"];
+    
+    SDWebImageDownloader *downloader = [[SDWebImageDownloader alloc] init];
+    downloader.decryptor = SDWebImageDownloaderDecryptor.base64Decryptor;
+    
+    // 1. Test fileURL with Base64 encoded data works
+    NSData *PNGData = [NSData dataWithContentsOfFile:[self testPNGPath]];
+    NSData *base64PNGData = [PNGData base64EncodedDataWithOptions:0];
+    expect(base64PNGData).notTo.beNil();
+    NSURL *base64FileURL = [NSURL fileURLWithPath:[NSTemporaryDirectory() stringByAppendingPathComponent:@"TestBase64.png"]];
+    [base64PNGData writeToURL:base64FileURL atomically:YES];
+    [downloader downloadImageWithURL:base64FileURL options:0 progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
+        expect(error).to.beNil();
+        expect(image).notTo.beNil();
+        [expectation1 fulfill];
+    }];
+    
+    // 2. Test webURL with Zip encoded data works
+    SDWebImageDownloaderDecryptor *decryptor = [SDWebImageDownloaderDecryptor decryptorWithBlock:^NSData * _Nullable(NSData * _Nonnull data, NSURLResponse * _Nullable response) {
+        if (@available(iOS 13, macOS 10.15, tvOS 13, *)) {
+            return [data decompressedDataUsingAlgorithm:NSDataCompressionAlgorithmZlib error:nil];
+        } else {
+            NSMutableData *decodedData = [NSMutableData dataWithLength:10 * data.length];
+            compression_decode_buffer((uint8_t *)decodedData.bytes, decodedData.length, data.bytes, data.length, nil, COMPRESSION_ZLIB);
+            return [decodedData copy];
+        }
+    }];
+    // Note this is not a Zip Archive, just PNG raw buffer data using zlib compression
+    NSURL *zipURL = [NSURL URLWithString:@"https://github.com/SDWebImage/SDWebImage/files/3728087/SDWebImage_logo_small.png.zip"];
+    
+    [downloader downloadImageWithURL:zipURL options:0 context:@{SDWebImageContextDownloadDecryptor : decryptor} progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
+        expect(error).to.beNil();
+        expect(image).notTo.beNil();
+        [expectation2 fulfill];
+    }];
+    
+    // 3. Test nil data will mark download failed
+    decryptor = [SDWebImageDownloaderDecryptor decryptorWithBlock:^NSData * _Nullable(NSData * _Nonnull data, NSURLResponse * _Nullable response) {
+        return nil;
+    }];
+    [downloader downloadImageWithURL:[NSURL URLWithString:kTestJPEGURL] options:0 context:@{SDWebImageContextDownloadDecryptor : decryptor} progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
+        expect(error).notTo.beNil();
+        expect(error.code).equal(SDWebImageErrorBadImageData);
+        [expectation3 fulfill];
+    }];
+    
+    [self waitForExpectationsWithCommonTimeoutUsingHandler:^(NSError * _Nullable error) {
+        [downloader invalidateSessionAndCancel:YES];
+    }];
+}
+
+- (void)test26DownloadURLSessionMetrics {
+    XCTestExpectation *expectation1 = [self expectationWithDescription:@"Download URLSessionMetrics works"];
+    
+    SDWebImageDownloader *downloader = [[SDWebImageDownloader alloc] init];
+    
+    __block SDWebImageDownloadToken *token;
+    token = [downloader downloadImageWithURL:[NSURL URLWithString:kTestJPEGURL] completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
+        expect(error).beNil();
+        if (@available(iOS 10.0, tvOS 10.0, macOS 10.12, *)) {
+            NSURLSessionTaskMetrics *metrics = token.metrics;
+            expect(metrics).notTo.beNil();
+            expect(metrics.transactionMetrics.count).equal(1);
+            NSURLSessionTaskTransactionMetrics *metric = metrics.transactionMetrics.firstObject;
+            // Metrcis Test
+            expect(metric.fetchStartDate).notTo.beNil();
+            expect(metric.connectStartDate).notTo.beNil();
+            expect(metric.connectEndDate).notTo.beNil();
+        }
+        [expectation1 fulfill];
+    }];
+    
+    [self waitForExpectationsWithCommonTimeoutUsingHandler:^(NSError * _Nullable error) {
+        [downloader invalidateSessionAndCancel:YES];
+    }];
+}
+
+- (void)test27DownloadShouldCallbackWhenURLSessionRunning {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Downloader should callback when URLSessionTask running"];
+    
+    NSURL *url = [NSURL URLWithString: @"https://raw.githubusercontent.com/SDWebImage/SDWebImage/master/SDWebImage_logo.png"];
+    NSString *key = [SDWebImageManager.sharedManager cacheKeyForURL:url];
+    
+    [SDImageCache.sharedImageCache removeImageForKey:key withCompletion:^{
+        SDWebImageCombinedOperation *operation = [SDWebImageManager.sharedManager loadImageWithURL:url options:0 progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+            expect(error.domain).equal(SDWebImageErrorDomain);
+            expect(error.code).equal(SDWebImageErrorCancelled);
+            [expectation fulfill];
+        }];
+        
+        dispatch_async(dispatch_get_main_queue(), ^{
+            [operation cancel];
+        });
+    }];
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test28ProgressiveDownloadShouldUseSameCoder  {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Progressive download should use the same coder for each animated image"];
+    SDWebImageDownloader *downloader = [[SDWebImageDownloader alloc] init];
+    
+    __block SDWebImageDownloadToken *token;
+    __block id<SDImageCoder> progressiveCoder;
+    token = [downloader downloadImageWithURL:[NSURL URLWithString:kTestGIFURL] options:SDWebImageDownloaderProgressiveLoad context:@{SDWebImageContextAnimatedImageClass : SDAnimatedImage.class} progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
+        expect(error).beNil();
+        expect([image isKindOfClass:SDAnimatedImage.class]).beTruthy();
+        id<SDImageCoder> coder = ((SDAnimatedImage *)image).animatedCoder;
+        if (!progressiveCoder) {
+            progressiveCoder = coder;
+        }
+        expect(progressiveCoder).equal(coder);
+        if (!finished) {
+            progressiveCoder = coder;
+        } else {
+            [expectation fulfill];
+        }
+    }];
+    
+    [self waitForExpectationsWithCommonTimeoutUsingHandler:^(NSError * _Nullable error) {
+        [downloader invalidateSessionAndCancel:YES];
+    }];
+}
+
+- (void)test29AcceptableStatusCodeAndContentType {
+    SDWebImageDownloaderConfig *config1 = [[SDWebImageDownloaderConfig alloc] init];
+    config1.acceptableStatusCodes = [NSIndexSet indexSetWithIndex:1];
+    SDWebImageDownloader *downloader1 = [[SDWebImageDownloader alloc] initWithConfig:config1];
+    XCTestExpectation *expectation1 = [self expectationWithDescription:@"Acceptable status code should work"];
+    
+    SDWebImageDownloaderConfig *config2 = [[SDWebImageDownloaderConfig alloc] init];
+    config2.acceptableContentTypes = [NSSet setWithArray:@[@"application/json"]];
+    SDWebImageDownloader *downloader2 = [[SDWebImageDownloader alloc] initWithConfig:config2];
+    XCTestExpectation *expectation2 = [self expectationWithDescription:@"Acceptable content type should work"];
+    
+    __block SDWebImageDownloadToken *token1;
+    token1 = [downloader1 downloadImageWithURL:[NSURL URLWithString:kTestJPEGURL] completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
+        expect(error).notTo.beNil();
+        expect(error.code).equal(SDWebImageErrorInvalidDownloadStatusCode);
+        NSInteger statusCode = ((NSHTTPURLResponse *)token1.response).statusCode;
+        expect(statusCode).equal(200);
+        [expectation1 fulfill];
+    }];
+    
+    __block SDWebImageDownloadToken *token2;
+    token2 = [downloader2 downloadImageWithURL:[NSURL URLWithString:kTestJPEGURL] completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
+        expect(error).notTo.beNil();
+        expect(error.code).equal(SDWebImageErrorInvalidDownloadContentType);
+        NSString *contentType = ((NSHTTPURLResponse *)token2.response).MIMEType;
+        expect(contentType).equal(@"image/jpeg");
+        [expectation2 fulfill];
+    }];
+    
+    [self waitForExpectationsWithCommonTimeoutUsingHandler:^(NSError * _Nullable error) {
+        [downloader1 invalidateSessionAndCancel:YES];
+        [downloader2 invalidateSessionAndCancel:YES];
+    }];
+}
+
+- (void)test30ThatDifferentThumbnailLoadShouldCallbackDifferentSize {
+    // We move the logic into SDWebImageDownloaderOperation, which decode each callback's thumbnail size with different decoding pipeline, and callback independently
+    // Note the progressiveLoad does not support this and always callback first size
+    
+    NSURL *url = [NSURL URLWithString:@"https://placehold.co/501x501.png"];
+    NSString *fullSizeKey = [SDWebImageManager.sharedManager cacheKeyForURL:url];
+    [SDImageCache.sharedImageCache removeImageFromDiskForKey:fullSizeKey];
+    for (int i = 490; i < 500; i++) {
+        // 490x490, ..., 499x499
+        CGSize thumbnailSize = CGSizeMake(i, i);
+        NSString *thumbnailKey = SDThumbnailedKeyForKey(fullSizeKey, thumbnailSize, YES);
+        [SDImageCache.sharedImageCache removeImageFromDiskForKey:thumbnailKey];
+        XCTestExpectation *expectation = [self expectationWithDescription:[NSString stringWithFormat:@"Different thumbnail loading for same URL should callback different image size: (%dx%d)", i, i]];
+        [SDImageCache.sharedImageCache removeImageFromDiskForKey:url.absoluteString];
+        [SDWebImageDownloader.sharedDownloader downloadImageWithURL:url options:0 context:@{SDWebImageContextImageThumbnailPixelSize : @(thumbnailSize)} progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
+            expect(image.size).equal(thumbnailSize);
+            
+            [expectation fulfill];
+        }];
+    }
+    
+    [self waitForExpectationsWithTimeout:kAsyncTestTimeout * 5 handler:nil];
+}
+
+- (void)test31ThatMultipleRequestForSameURLNeverSkipCallback {
+    // See #3475
+    // When multiple download request for same URL, the SDWebImageDownloader will try to `Re-use` URLSessionTask to avoid duplicate actual network request
+    // However, if caller submit too frequently in another queue, we should stop attaching more callback once the URLSessionTask `didCompleteWithError:` is called
+    NSURL *url = [NSURL fileURLWithPath:[self testPNGPath]];
+    NSMutableArray<XCTestExpectation *> *expectations = [NSMutableArray arrayWithCapacity:100];
+    __block void (^recursiveBlock)(int);
+    void (^mainBlock)(int) = ^(int i) {
+        if (i > 200) return;
+        NSString *desc = [NSString stringWithFormat:@"Local url with index %d not callback!", i];
+        XCTestExpectation *expectation = [self expectationWithDescription:desc];
+        [expectations addObject:expectation];
+        // Delay 0.01s ~ 0.99s for each download request, simulate the real-world call site
+        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(i * 10000000ull)), dispatch_get_main_queue(), ^{
+            [SDWebImageDownloader.sharedDownloader downloadImageWithURL:url completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
+                if (image) {
+                    NSLog(@"Local url callback with index: %d", i);
+                    [expectation fulfill];
+                } else {
+                    XCTFail(@"Something went wrong: %@", error.description);
+                }
+            }];
+        });
+        recursiveBlock(i+1);
+    };
+    recursiveBlock = mainBlock;
+    recursiveBlock(0);
+    
+    [self waitForExpectations:expectations timeout:kAsyncTestTimeout * 2];
+}
+
+- (void)test31ThatMultipleRequestForSameURLFailedCallback {
+    // See #3493, silly bug
+    // Create tmp file with empty contents
+    NSURL *dir = [[NSURL fileURLWithPath:NSTemporaryDirectory()] URLByAppendingPathComponent:NSStringFromSelector(_cmd) isDirectory: true];
+    [NSFileManager.defaultManager createDirectoryAtURL:dir withIntermediateDirectories:YES attributes:nil error:nil];
+    NSURL *url = [dir URLByAppendingPathComponent:@"file" isDirectory:NO];
+    [[NSData data] writeToURL:url atomically:YES]; // Always fail url (but valid)
+    NSMutableArray<XCTestExpectation *> *expectations = [NSMutableArray arrayWithCapacity:10];
+    __block void (^recursiveBlock)(int);
+    void (^mainBlock)(int) = ^(int i) {
+        if (i > 10) return;
+        NSString *desc = [NSString stringWithFormat:@"Failed url with index %d should callback error", i];
+        XCTestExpectation *expectation = [self expectationWithDescription:desc];
+        [expectations addObject:expectation];
+        // Delay 0.01s ~ 0.99s for each download request, simulate the real-world call site
+        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(i * 10000000ull)), dispatch_get_main_queue(), ^{
+            [SDWebImageDownloader.sharedDownloader downloadImageWithURL:url completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
+                if (error) {
+                    expect(error.code).equal(SDWebImageErrorBadImageData);
+                    [expectation fulfill];
+                }
+            }];
+        });
+        recursiveBlock(i+1);
+    };
+    recursiveBlock = mainBlock;
+    recursiveBlock(0);
+    
+    [self waitForExpectations:expectations timeout:kAsyncTestTimeout * 2];
+}
+
+#pragma mark - SDWebImageLoader
+- (void)testCustomImageLoaderWorks {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Custom image not works"];
+    SDWebImageTestLoader *loader = [[SDWebImageTestLoader alloc] init];
+    NSURL *imageURL = [NSURL URLWithString:kTestJPEGURL];
+    expect([loader canRequestImageForURL:imageURL]).beTruthy();
+    expect([loader canRequestImageForURL:imageURL options:0 context:nil]).beTruthy();
+    NSError *imageError = [NSError errorWithDomain:NSURLErrorDomain code:NSURLErrorCancelled userInfo:nil];
+    expect([loader shouldBlockFailedURLWithURL:imageURL error:imageError]).equal(NO);
+    
+    [loader requestImageWithURL:imageURL options:0 context:nil progress:^(NSInteger receivedSize, NSInteger expectedSize, NSURL * _Nullable targetURL) {
+        expect(targetURL).notTo.beNil();
+    } completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
+        expect(error).to.beNil();
+        expect(image).notTo.beNil();
+        [expectation fulfill];
+    }];
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)testThatLoadersManagerWorks {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Loaders manager not works"];
+    SDWebImageTestLoader *loader = [[SDWebImageTestLoader alloc] init];
+    SDImageLoadersManager *manager = [[SDImageLoadersManager alloc] init];
+    [manager addLoader:loader];
+    [manager removeLoader:loader];
+    manager.loaders = @[SDWebImageDownloader.sharedDownloader, loader];
+    NSURL *imageURL = [NSURL URLWithString:kTestJPEGURL];
+    expect([manager canRequestImageForURL:imageURL]).beTruthy();
+    expect([manager canRequestImageForURL:imageURL options:0 context:nil]).beTruthy();
+    NSError *imageError = [NSError errorWithDomain:NSURLErrorDomain code:NSURLErrorCancelled userInfo:nil];
+    expect([manager shouldBlockFailedURLWithURL:imageURL error:imageError]).equal(NO);
+    
+    [manager requestImageWithURL:imageURL options:0 context:nil progress:^(NSInteger receivedSize, NSInteger expectedSize, NSURL * _Nullable targetURL) {
+        expect(targetURL).notTo.beNil();
+    } completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
+        expect(error).to.beNil();
+        expect(image).notTo.beNil();
+        [expectation fulfill];
+    }];
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+#pragma mark - Helper
+
+- (NSString *)testPNGPath {
+    NSBundle *testBundle = [NSBundle bundleForClass:[self class]];
+    return [testBundle pathForResource:@"TestImage" ofType:@"png"];
+}
+
+@end
diff --git a/Tests/Tests/SDWebImageManagerTests.m b/Tests/Tests/SDWebImageManagerTests.m
index 4c79f24f0..e85dba245 100644
--- a/Tests/Tests/SDWebImageManagerTests.m
+++ b/Tests/Tests/SDWebImageManagerTests.m
@@ -7,7 +7,17 @@
  */
 
 #import "SDTestCase.h"
-#import <SDWebImage/SDWebImageManager.h>
+#import "SDWebImageTestTransformer.h"
+#import "SDWebImageTestCache.h"
+#import "SDWebImageTestLoader.h"
+
+// Keep strong references for object
+@interface SDObjectContainer<ObjectType> : NSObject
+@property (nonatomic, strong, readwrite) ObjectType object;
+@end
+
+@implementation SDObjectContainer
+@end
 
 @interface SDWebImageManagerTests : SDTestCase
 
@@ -23,22 +33,32 @@ - (void)test01ThatSharedManagerIsNotEqualToInitManager {
 - (void)test02ThatDownloadInvokesCompletionBlockWithCorrectParamsAsync {
     __block XCTestExpectation *expectation = [self expectationWithDescription:@"Image download completes"];
 
-    NSURL *originalImageURL = [NSURL URLWithString:kTestJpegURL];
+    NSURL *originalImageURL = [NSURL URLWithString:kTestJPEGURL];
     
-    [[SDWebImageManager sharedManager] loadImageWithURL:originalImageURL
-                                                options:SDWebImageRefreshCached
-                                               progress:nil
-                                              completed:^(UIImage *image, NSData *data, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {
+    [SDImageCache.sharedImageCache removeImageFromMemoryForKey:kTestJPEGURL];
+    [SDImageCache.sharedImageCache removeImageFromDiskForKey:kTestJPEGURL];
+    SDObjectContainer<SDWebImageCombinedOperation *> *container = [SDObjectContainer new];
+    container.object = [[SDWebImageManager sharedManager] loadImageWithURL:originalImageURL
+                                                                   options:0
+                                                                  progress:nil
+                                                                 completed:^(UIImage *image, NSData *data, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {
         expect(image).toNot.beNil();
         expect(error).to.beNil();
         expect(originalImageURL).to.equal(imageURL);
-
+        
+        // When download, the cache operation will reset to nil since it's always finished
+        SDWebImageCombinedOperation *operation = container.object;
+        expect(container).notTo.beNil();
+        expect(operation.cacheOperation).beNil();
+        expect(operation.loaderOperation).notTo.beNil();
+        container.object = nil;
+        
         [expectation fulfill];
         expectation = nil;
     }];
     expect([[SDWebImageManager sharedManager] isRunning]).to.equal(YES);
 
-    [self waitForExpectationsWithCommonTimeout];
+    [self waitForExpectationsWithTimeout:kAsyncTestTimeout * 2 handler:nil];
 }
 
 - (void)test03ThatDownloadWithIncorrectURLInvokesCompletionBlockWithAnErrorAsync {
@@ -47,7 +67,7 @@ - (void)test03ThatDownloadWithIncorrectURLInvokesCompletionBlockWithAnErrorAsync
     NSURL *originalImageURL = [NSURL URLWithString:@"http://static2.dmcdn.net/static/video/656/177/44771656:jpeg_preview_small.png"];
     
     [[SDWebImageManager sharedManager] loadImageWithURL:originalImageURL
-                                                options:SDWebImageRefreshCached
+                                                options:0
                                                progress:nil
                                               completed:^(UIImage *image, NSData *data, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {
         expect(image).to.beNil();
@@ -61,40 +81,15 @@ - (void)test03ThatDownloadWithIncorrectURLInvokesCompletionBlockWithAnErrorAsync
     [self waitForExpectationsWithCommonTimeout];
 }
 
-- (void)test04CachedImageExistsForURL {
-    __block XCTestExpectation *expectation = [self expectationWithDescription:@"Image exists in cache"];
-    NSURL *imageURL = [NSURL URLWithString:kTestJpegURL];
-    [[SDWebImageManager sharedManager] cachedImageExistsForURL:imageURL completion:^(BOOL isInCache) {
-        if (isInCache) {
-            [expectation fulfill];
-        } else {
-            XCTFail(@"Image should be in cache");
-        }
-    }];
-    [self waitForExpectationsWithCommonTimeout];
-}
-
-- (void)test05DiskImageExistsForURL {
-    __block XCTestExpectation *expectation = [self expectationWithDescription:@"Image exists in disk cache"];
-    NSURL *imageURL = [NSURL URLWithString:kTestJpegURL];
-    [[SDWebImageManager sharedManager] diskImageExistsForURL:imageURL completion:^(BOOL isInCache) {
-        if (isInCache) {
-            [expectation fulfill];
-        } else {
-            XCTFail(@"Image should be in cache");
-        }
-    }];
-    [self waitForExpectationsWithCommonTimeout];
-}
-
 - (void)test06CancellAll {
-    XCTestExpectation *expectation = [self expectationWithDescription:@"Cancel"];
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Cancel should callback with error"];
     
-    // need a bigger image here, that is why we don't use kTestJpegURL
+    // need a bigger image here, that is why we don't use kTestJPEGURL
     // if the image is too small, it will get downloaded before we can cancel :)
-    NSURL *imageURL = [NSURL URLWithString:@"https://s3.amazonaws.com/fast-image-cache/demo-images/FICDDemoImage001.jpg"];
-    [[SDWebImageManager sharedManager] loadImageWithURL:imageURL options:0 progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
-        XCTFail(@"Should not get here");
+    NSURL *url = [NSURL URLWithString:@"https://raw.githubusercontent.com/liyong03/YLGIFImage/master/YLGIFImageDemo/YLGIFImageDemo/joy.gif"];
+    [[SDWebImageManager sharedManager] loadImageWithURL:url options:0 progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+        expect(error).notTo.beNil();
+        expect(error.code).equal(SDWebImageErrorCancelled);
     }];
     
     [[SDWebImageManager sharedManager] cancelAll];
@@ -105,12 +100,12 @@ - (void)test06CancellAll {
         [expectation fulfill];
     });
     
-    [self waitForExpectationsWithCommonTimeout];
+    [self waitForExpectationsWithTimeout:kAsyncTestTimeout * 2 handler:nil];
 }
 
 - (void)test07ThatLoadImageWithSDWebImageRefreshCachedWorks {
     XCTestExpectation *expectation = [self expectationWithDescription:@"Image download twice with SDWebImageRefresh failed"];
-    NSURL *originalImageURL = [NSURL URLWithString:@"http://via.placeholder.com/10x10.png"];
+    NSURL *originalImageURL = [NSURL URLWithString:@"https://placehold.co/10x10.png"];
     __block BOOL firstCompletion = NO;
     [[SDWebImageManager sharedManager] loadImageWithURL:originalImageURL options:SDWebImageRefreshCached progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
         expect(image).toNot.beNil();
@@ -120,7 +115,7 @@ - (void)test07ThatLoadImageWithSDWebImageRefreshCachedWorks {
         // Because we call completion before remove the operation from queue, so need a dispatch to avoid get the same operation again. Attention this trap.
         // One way to solve this is use another `NSURL instance` because we use `NSURL` as key but not `NSString`. However, this is implementation detail and no guarantee in the future.
         dispatch_async(dispatch_get_main_queue(), ^{
-            NSURL *newImageURL = [NSURL URLWithString:@"http://via.placeholder.com/10x10.png"];
+            NSURL *newImageURL = [NSURL URLWithString:@"https://placehold.co/10x10.png"];
             [[SDWebImageManager sharedManager] loadImageWithURL:newImageURL options:SDWebImageRefreshCached progress:nil completed:^(UIImage * _Nullable image2, NSData * _Nullable data2, NSError * _Nullable error2, SDImageCacheType cacheType2, BOOL finished2, NSURL * _Nullable imageURL2) {
                 expect(image2).toNot.beNil();
                 expect(error2).to.beNil();
@@ -135,4 +130,543 @@ - (void)test07ThatLoadImageWithSDWebImageRefreshCachedWorks {
     [self waitForExpectationsWithTimeout:kAsyncTestTimeout * 2 handler:nil];
 }
 
+- (void)test08ThatImageTransformerWork {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Image transformer work"];
+    NSURL *url = [NSURL URLWithString:@"https://placehold.co/80x60.jpg"];
+    SDWebImageTestTransformer *transformer = [[SDWebImageTestTransformer alloc] init];
+    transformer.preserveImageMetadata = YES; // preserve metadata
+    NSData *extData = [@"Foobar" dataUsingEncoding:NSUTF8StringEncoding];
+    
+    CGSize transformSize = CGSizeMake(40, 30);
+    UIImage *testImage = [[[UIImage alloc] initWithContentsOfFile:[self testJPEGPath]] sd_resizedImageWithSize:transformSize scaleMode:SDImageScaleModeFill];
+    testImage.sd_imageFormat = SDImageFormatUndefined;
+    testImage.sd_extendedObject = extData;
+    transformer.testImage = testImage;
+    SDImageCache *cache = [[SDImageCache alloc] initWithNamespace:@"Transformer"];
+    SDWebImageManager *manager = [[SDWebImageManager alloc] initWithCache:cache loader:SDWebImageDownloader.sharedDownloader];
+    NSString *key = [manager cacheKeyForURL:url];
+    NSString *transformedKey = [manager cacheKeyForURL:url context:@{SDWebImageContextImageTransformer : transformer}];
+    
+    manager.transformer = transformer;
+    [cache removeImageFromDiskForKey:key];
+    [cache removeImageFromMemoryForKey:key];
+    [cache removeImageFromDiskForKey:transformedKey];
+    [cache removeImageFromMemoryForKey:transformedKey];
+    // Test encode options with transformer (because data is not available)
+    SDImageCoderOptions *encodeOptions = @{SDImageCoderEncodeMaxPixelSize : @(CGSizeMake(40, 30))};
+    [manager loadImageWithURL:url options:SDWebImageTransformAnimatedImage | SDWebImageTransformVectorImage | SDWebImageWaitStoreCache context:@{SDWebImageContextImageEncodeOptions : encodeOptions} progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+        expect(image).equal(transformer.testImage);
+        // Test metadata
+        expect(image.size).equal(transformSize);
+        expect(image.sd_isTransformed).equal(YES);
+        expect(image.sd_imageFormat).equal(SDImageFormatJPEG); // override from full image
+        expect(image.sd_extendedObject).beNil(); // override from full image
+        
+        // Query the encoded data again
+        NSData *encodedData = [cache diskImageDataForKey:transformedKey];
+        UIImage *encodedImage = [UIImage sd_imageWithData:encodedData];
+        CGSize encodedImageSize = encodedImage.size;
+        expect(encodedImageSize.width).equal(40);
+        expect(encodedImageSize.height).equal(30);
+        [expectation fulfill];
+    }];
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test09ThatCacheKeyFilterWork {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Cache key filter work"];
+    NSURL *url = [NSURL URLWithString:kTestJPEGURL];
+    
+    NSString *cacheKey = @"kTestJPEGURL";
+    SDWebImageCacheKeyFilter *cacheKeyFilter = [SDWebImageCacheKeyFilter cacheKeyFilterWithBlock:^NSString * _Nullable(NSURL * _Nonnull imageURL) {
+        if ([url isEqual:imageURL]) {
+            return cacheKey;
+        } else {
+            return url.absoluteString;
+        }
+    }];
+    
+    SDWebImageManager *manager = [[SDWebImageManager alloc] initWithCache:[SDImageCache sharedImageCache] loader:[SDWebImageDownloader sharedDownloader]];
+    manager.cacheKeyFilter = cacheKeyFilter;
+    // Check download and retrieve custom cache key
+    [manager loadImageWithURL:url options:0 context:@{SDWebImageContextStoreCacheType : @(SDImageCacheTypeMemory)} progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+        expect(cacheType).equal(SDImageCacheTypeNone);
+        
+        // Check memory cache exist
+        [manager.imageCache containsImageForKey:cacheKey cacheType:SDImageCacheTypeMemory completion:^(SDImageCacheType containsCacheType) {
+            expect(containsCacheType).equal(SDImageCacheTypeMemory);
+            
+            [expectation fulfill];
+        }];
+    }];
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test10ThatCacheSerializerWork {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Cache serializer work"];
+    NSURL *url = [NSURL URLWithString:kTestJPEGURL];
+    __block NSData *imageData;
+    
+    SDWebImageCacheSerializer *cacheSerializer = [SDWebImageCacheSerializer cacheSerializerWithBlock:^NSData * _Nullable(UIImage * _Nonnull image, NSData * _Nullable data, NSURL * _Nullable imageURL) {
+        imageData = [image sd_imageDataAsFormat:SDImageFormatPNG];
+        return imageData;
+    }];
+    
+    SDWebImageManager *manager = [[SDWebImageManager alloc] initWithCache:[SDImageCache sharedImageCache] loader:[SDWebImageDownloader sharedDownloader]];
+    manager.cacheSerializer = cacheSerializer;
+    // Check download and store custom disk data
+    [[SDImageCache sharedImageCache] removeImageForKey:kTestJPEGURL withCompletion:^{
+        [manager loadImageWithURL:url options:0 progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+            // Dispatch to let store disk finish
+            dispatch_after(dispatch_time(DISPATCH_TIME_NOW, kMinDelayNanosecond), dispatch_get_main_queue(), ^{
+                NSData *diskImageData = [[SDImageCache sharedImageCache] diskImageDataForKey:kTestJPEGURL];
+                expect(diskImageData).equal(imageData); // disk data equal to serializer data
+                
+                [expectation fulfill];
+            });
+        }];
+    }];
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test11ThatOptionsProcessorWork {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Options processor work"];
+    __block BOOL optionsProcessorCalled = NO;
+    
+    SDWebImageManager *manager = [[SDWebImageManager alloc] initWithCache:[SDImageCache sharedImageCache] loader:[SDWebImageDownloader sharedDownloader]];
+    manager.optionsProcessor = [SDWebImageOptionsProcessor optionsProcessorWithBlock:^SDWebImageOptionsResult * _Nullable(NSURL * _Nonnull url, SDWebImageOptions options, SDWebImageContext * _Nullable context) {
+        if ([url.absoluteString isEqualToString:kTestPNGURL]) {
+            optionsProcessorCalled = YES;
+            return [[SDWebImageOptionsResult alloc] initWithOptions:0 context:@{SDWebImageContextImageScaleFactor : @(3)}];
+        } else {
+            return nil;
+        }
+    }];
+    
+    NSURL *url = [NSURL URLWithString:kTestPNGURL];
+    [[SDImageCache sharedImageCache] removeImageForKey:kTestPNGURL withCompletion:^{
+        [manager loadImageWithURL:url options:0 progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+            expect(image.scale).equal(3);
+            expect(optionsProcessorCalled).beTruthy();
+            
+            [expectation fulfill];
+        }];
+    }];
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test12ThatStoreCacheTypeWork {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Image store cache type (including transformer) work"];
+    
+    // Use a fresh manager && cache to avoid get effected by other test cases
+    SDImageCache *cache = [[SDImageCache alloc] initWithNamespace:@"SDWebImageStoreCacheType"];
+    [cache clearDiskOnCompletion:nil];
+    SDWebImageManager *manager = [[SDWebImageManager alloc] initWithCache:cache loader:SDWebImageDownloader.sharedDownloader];
+    SDWebImageTestTransformer *transformer = [[SDWebImageTestTransformer alloc] init];
+    transformer.testImage = [[UIImage alloc] initWithContentsOfFile:[self testJPEGPath]];
+    transformer.preserveImageMetadata = NO; // the transformed image should not inherite any attribute from original one
+    manager.transformer = transformer;
+    
+    // test: original image -> disk only, transformed image -> memory only
+    SDWebImageContext *context = @{SDWebImageContextOriginalStoreCacheType : @(SDImageCacheTypeDisk), SDWebImageContextStoreCacheType : @(SDImageCacheTypeMemory)};
+    NSURL *url = [NSURL URLWithString:kTestAPNGPURL];
+    NSString *originalKey = [manager cacheKeyForURL:url];
+    NSString *transformedKey = [manager cacheKeyForURL:url context:context];
+    
+    [manager loadImageWithURL:url options:SDWebImageTransformAnimatedImage context:context progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+        expect(image).equal(transformer.testImage);
+        // the transformed image should not inherite any attribute from original one
+        expect(image.sd_imageFormat).equal(SDImageFormatJPEG);
+        expect(image.sd_isAnimated).beFalsy();
+        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 2*kMinDelayNanosecond), dispatch_get_main_queue(), ^{
+            // original -> disk only
+            UIImage *originalImage = [cache imageFromMemoryCacheForKey:originalKey];
+            expect(originalImage).beNil();
+            NSData *originalData = [cache diskImageDataForKey:originalKey];
+            expect(originalData).notTo.beNil();
+            originalImage = [UIImage sd_imageWithData:originalData];
+            expect(originalImage).notTo.beNil();
+            expect(originalImage.sd_imageFormat).equal(SDImageFormatPNG);
+            expect(originalImage.sd_isAnimated).beTruthy();
+            // transformed -> memory only
+            [manager.imageCache containsImageForKey:transformedKey cacheType:SDImageCacheTypeAll completion:^(SDImageCacheType transformedCacheType) {
+                expect(transformedCacheType).equal(SDImageCacheTypeMemory);
+                [cache clearDiskOnCompletion:nil];
+                [expectation fulfill];
+            }];
+        });
+    }];
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test13ThatScaleDownLargeImageUseThumbnailDecoding {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"SDWebImageScaleDownLargeImages should translate to thumbnail decoding"];
+    NSURL *originalImageURL = [NSURL URLWithString:@"https://placehold.co/2000x2000.png"]; // Max size for this API
+    NSUInteger defaultLimitBytes = SDImageCoderHelper.defaultScaleDownLimitBytes;
+    SDImageCoderHelper.defaultScaleDownLimitBytes = 1000 * 1000 * 4; // Limit 1000x1000 pixel
+    // From v5.5.0, the `SDWebImageScaleDownLargeImages` translate to `SDWebImageContextImageThumbnailPixelSize`, and works for progressive loading
+    [SDWebImageManager.sharedManager loadImageWithURL:originalImageURL options:SDWebImageFromLoaderOnly | SDWebImageScaleDownLargeImages | SDWebImageProgressiveLoad progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+        expect(image).notTo.beNil();
+        expect(image.size).equal(CGSizeMake(1000, 1000));
+        if (finished) {
+            expect(image.sd_isIncremental).beFalsy();
+            [expectation fulfill];
+        } else {
+            expect(image.sd_isIncremental).beTruthy();
+        }
+    }];
+    
+    [self waitForExpectationsWithCommonTimeoutUsingHandler:^(NSError * _Nullable error) {
+        SDImageCoderHelper.defaultScaleDownLimitBytes = defaultLimitBytes;
+    }];
+}
+
+- (void)test13ThatScaleDownLargeImageEXIFOrientationImage {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"SDWebImageScaleDownLargeImages works on EXIF orientation image"];
+    NSURL *originalImageURL = [NSURL URLWithString:@"https://raw.githubusercontent.com/recurser/exif-orientation-examples/master/Landscape_2.jpg"];
+    [SDWebImageManager.sharedManager loadImageWithURL:originalImageURL options:SDWebImageScaleDownLargeImages context:@{SDWebImageContextImageForceDecodePolicy : @(SDImageForceDecodePolicyNever)} progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+        expect(image).notTo.beNil();
+#if SD_UIKIT
+        // The UIGraphicsImageRenderer will correct image to Up(1) orientation
+        // So we disable that to test the behavior
+        UIImageOrientation orientation = [SDImageCoderHelper imageOrientationFromEXIFOrientation:kCGImagePropertyOrientationUpMirrored];
+        expect(image.imageOrientation).equal(orientation);
+#endif
+        if (finished) {
+            expect(image.sd_isIncremental).beFalsy();
+            [expectation fulfill];
+        } else {
+            expect(image.sd_isIncremental).beTruthy();
+        }
+    }];
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test14ThatCustomCacheAndLoaderWorks {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Custom Cache and Loader during manger query"];
+    NSURL *url = [NSURL URLWithString:@"https://placehold.co/100x100.png"];
+    SDWebImageContext *context = @{
+        SDWebImageContextImageCache : SDWebImageTestCache.sharedCache,
+        SDWebImageContextImageLoader : SDWebImageTestLoader.sharedLoader
+    };
+    [SDWebImageTestCache.sharedCache clearWithCacheType:SDImageCacheTypeAll completion:nil];
+    [SDWebImageManager.sharedManager loadImageWithURL:url options:SDWebImageWaitStoreCache context:context progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+        expect(image).notTo.beNil();
+        expect(image.size.width).equal(100);
+        expect(image.size.height).equal(100);
+        expect(data).notTo.beNil();
+        NSString *cacheKey = [SDWebImageManager.sharedManager cacheKeyForURL:imageURL];
+        // Check Disk Cache (SDWebImageWaitStoreCache behavior)
+        [SDWebImageTestCache.sharedCache containsImageForKey:cacheKey cacheType:SDImageCacheTypeDisk completion:^(SDImageCacheType containsCacheType) {
+            expect(containsCacheType).equal(SDImageCacheTypeDisk);
+            [expectation fulfill];
+        }];
+    }];
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test15ThatQueryCacheTypeWork {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Image query cache type works"];
+    NSURL *url = [NSURL URLWithString:@"https://placehold.co/101x101.png"];
+    NSString *key = [SDWebImageManager.sharedManager cacheKeyForURL:url];
+    NSData *testImageData = [NSData dataWithContentsOfFile:[self testJPEGPath]];
+    UIImage *testImage = [UIImage sd_imageWithData:testImageData];
+    [SDImageCache.sharedImageCache storeImageDataToDisk:testImageData forKey:key];
+    
+    // Query memory first
+    [SDWebImageManager.sharedManager loadImageWithURL:url options:SDWebImageFromCacheOnly context:@{SDWebImageContextQueryCacheType : @(SDImageCacheTypeMemory)} progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+        expect(image).beNil();
+        expect(cacheType).equal(SDImageCacheTypeNone);
+        // Store the image to memory
+        [SDImageCache.sharedImageCache storeImageToMemory:testImage forKey:key];
+        // Query disk secondly
+        [SDWebImageManager.sharedManager loadImageWithURL:url options:SDWebImageFromCacheOnly context:@{SDWebImageContextQueryCacheType : @(SDImageCacheTypeDisk)} progress:nil completed:^(UIImage * _Nullable image2, NSData * _Nullable data2, NSError * _Nullable error2, SDImageCacheType cacheType2, BOOL finished2, NSURL * _Nullable imageURL2) {
+            expect(image2).notTo.beNil();
+            expect(cacheType2).equal(SDImageCacheTypeDisk);
+            // We should ensure that this disk image is not the same one in-memory
+            expect(image2 != testImage).beTruthy();
+            [SDImageCache.sharedImageCache removeImageFromMemoryForKey:key];
+            [SDImageCache.sharedImageCache removeImageFromDiskForKey:key];
+            [expectation fulfill];
+        }];
+    }];
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test15ThatOriginalQueryCacheTypeWork {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Image original query cache type with transformer works"];
+    NSURL *url = [NSURL URLWithString:@"https://placehold.co/102x102.png"];
+    SDWebImageTestTransformer *transformer = [[SDWebImageTestTransformer alloc] init];
+    transformer.testImage = [[UIImage alloc] initWithContentsOfFile:[self testJPEGPath]];
+    NSString *originalKey = [SDWebImageManager.sharedManager cacheKeyForURL:url];
+    NSString *transformedKey = [SDWebImageManager.sharedManager cacheKeyForURL:url context:@{SDWebImageContextImageTransformer : transformer}];
+    
+    [[SDImageCache sharedImageCache] removeImageFromDiskForKey:originalKey];
+    [[SDImageCache sharedImageCache] removeImageFromMemoryForKey:originalKey];
+    [[SDImageCache sharedImageCache] removeImageFromDiskForKey:transformedKey];
+    [[SDImageCache sharedImageCache] removeImageFromMemoryForKey:transformedKey];
+    [[SDWebImageManager sharedManager] loadImageWithURL:url options:SDWebImageWaitStoreCache context:@{SDWebImageContextImageTransformer : transformer, SDWebImageContextOriginalStoreCacheType : @(SDImageCacheTypeAll)} progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+        // Get the transformed image
+        expect(image).equal(transformer.testImage);
+        // Now, the original image is stored into memory/disk cache
+        UIImage *originalImage = [SDImageCache.sharedImageCache imageFromMemoryCacheForKey:originalKey];
+        expect(originalImage.size).equal(CGSizeMake(102, 102));
+        // Query again with original cache type, which should not trigger any download
+        UIImage *transformedImage = [SDImageCache.sharedImageCache imageFromMemoryCacheForKey:transformedKey];
+        expect(image).equal(transformedImage);
+        [SDImageCache.sharedImageCache removeImageFromDiskForKey:transformedKey];
+        [SDImageCache.sharedImageCache removeImageFromMemoryForKey:transformedKey];
+        [SDWebImageManager.sharedManager loadImageWithURL:url options:SDWebImageWaitStoreCache | SDWebImageFromCacheOnly context:@{SDWebImageContextImageTransformer : transformer, SDWebImageContextOriginalQueryCacheType : @(SDImageCacheTypeAll)} progress:nil completed:^(UIImage * _Nullable image2, NSData * _Nullable data2, NSError * _Nullable error2, SDImageCacheType cacheType2, BOOL finished2, NSURL * _Nullable imageURL2) {
+            // Get the transformed image
+            expect(image2).equal(transformer.testImage);
+            expect(data).beNil(); // Currently, the thumbnailed and transformed image always data is nil, to avoid confuse user (the image and data represent no longer match)
+            [SDImageCache.sharedImageCache removeImageFromMemoryForKey:originalKey];
+            [SDImageCache.sharedImageCache removeImageFromDiskForKey:originalKey];
+            [expectation fulfill];
+        }];
+    }];
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test16ThatTransformerUseDifferentCacheForOriginalAndTransformedImage {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Image transformer use different cache instance for original image and transformed image works"];
+    NSURL *url = [NSURL URLWithString:@"https://placehold.co/103x103.png"];
+    SDWebImageTestTransformer *transformer = [[SDWebImageTestTransformer alloc] init];
+    transformer.testImage = [[UIImage alloc] initWithContentsOfFile:[self testJPEGPath]];
+    NSString *originalKey = [SDWebImageManager.sharedManager cacheKeyForURL:url];
+    NSString *transformedKey = [SDWebImageManager.sharedManager cacheKeyForURL:url context:@{SDWebImageContextImageTransformer : transformer}];
+    
+    SDImageCache *transformerCache = [[SDImageCache alloc] initWithNamespace:@"TransformerCache"];
+    SDImageCache *originalCache = [[SDImageCache alloc] initWithNamespace:@"OriginalCache"];
+    
+    [[SDWebImageManager sharedManager] loadImageWithURL:url options:SDWebImageWaitStoreCache context:
+     @{SDWebImageContextImageTransformer : transformer,
+       SDWebImageContextOriginalImageCache : originalCache,
+       SDWebImageContextImageCache : transformerCache,
+       SDWebImageContextOriginalStoreCacheType: @(SDImageCacheTypeMemory),
+       SDWebImageContextStoreCacheType: @(SDImageCacheTypeMemory)} progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+        // Get the transformed image
+        expect(image).equal(transformer.testImage);
+        expect(data).beNil(); // Currently, the thumbnailed and transformed image always data is nil, to avoid confuse user (the image and data represent no longer match)
+        // Now, the original image is stored into originalCache
+        UIImage *originalImage = [originalCache imageFromMemoryCacheForKey:originalKey];
+        expect(originalImage.size).equal(CGSizeMake(103, 103));
+        expect([transformerCache imageFromMemoryCacheForKey:originalKey]).beNil();
+        
+        // The transformed image is stored into transformerCache
+        UIImage *transformedImage = [transformerCache imageFromMemoryCacheForKey:transformedKey];
+        expect(image).equal(transformedImage);
+        expect([originalCache imageFromMemoryCacheForKey:transformedKey]).beNil();
+        
+        [originalCache clearWithCacheType:SDImageCacheTypeAll completion:nil];
+        [transformerCache clearWithCacheType:SDImageCacheTypeAll completion:nil];
+        
+        [expectation fulfill];
+    }];
+    
+    [self waitForExpectationsWithTimeout:kAsyncTestTimeout * 10 handler:nil];
+}
+
+- (void)test17ThatThumbnailCacheQueryNotWriteToWrongKey {
+    // 1. When query thumbnail decoding for SDImageCache, the thumbnailed image should not stored into full size key
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Thumbnail for cache should not store the wrong key"];
+    
+    // 500x500
+    CGSize fullSize = CGSizeMake(500, 500);
+    SDGraphicsImageRenderer *renderer = [[SDGraphicsImageRenderer alloc] initWithSize:fullSize];
+    UIImage *fullSizeImage = [renderer imageWithActions:^(CGContextRef  _Nonnull context) {
+        CGContextSetRGBFillColor(context, 1.0, 0.0, 0.0, 1.0);
+        CGContextSetRGBStrokeColor(context, 1.0, 0.0, 0.0, 1.0);
+        CGContextFillRect(context, CGRectMake(0, 0, fullSize.width, fullSize.height));
+    }];
+    expect(fullSizeImage.size).equal(fullSize);
+    
+    NSString *fullSizeKey = @"kTestRectangle";
+    // Disk only
+    [SDImageCache.sharedImageCache storeImageDataToDisk:fullSizeImage.sd_imageData forKey:fullSizeKey];
+    
+    CGSize thumbnailSize = CGSizeMake(100, 100);
+    NSString *thumbnailKey = SDThumbnailedKeyForKey(fullSizeKey, thumbnailSize, YES);
+    // thumbnail size key miss, full size key hit
+    [SDImageCache.sharedImageCache queryCacheOperationForKey:fullSizeKey options:0 context:@{SDWebImageContextImageThumbnailPixelSize : @(thumbnailSize)} done:^(UIImage * _Nullable image, NSData * _Nullable data, SDImageCacheType cacheType) {
+        expect(image.size).equal(thumbnailSize);
+        expect(cacheType).equal(SDImageCacheTypeDisk);
+        // Check the full image should not be in memory cache (because we have only full data + thumbnail image)
+        // Check the thumbnail image should be in memory cache (because we have only full data + thumbnail image)
+        expect([SDImageCache.sharedImageCache imageFromMemoryCacheForKey:fullSizeKey].size).equal(CGSizeZero);
+        expect([SDImageCache.sharedImageCache imageFromDiskCacheForKey:fullSizeKey]).notTo.beNil();
+        // Store disk no longer store into memory
+//        expect([SDImageCache.sharedImageCache imageFromMemoryCacheForKey:thumbnailKey].size).equal(thumbnailSize);
+        expect([SDImageCache.sharedImageCache imageFromDiskCacheForKey:thumbnailKey]).beNil();
+        
+        [SDImageCache.sharedImageCache removeImageFromDiskForKey:fullSizeKey];
+        [SDImageCache.sharedImageCache removeImageFromMemoryForKey:thumbnailKey];
+        [expectation fulfill];
+    }];
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test18ThatThumbnailLoadingCanUseFullSizeCache {
+    // 2. When using SDWebImageManager to load thumbnail image, it will prefers the full size image and thumbnail decoding on the fly, no network
+    
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Thumbnail for loading should prefers full size cache when thumbnail cache miss, like Transformer behavior"];
+    
+    // 500x500
+    CGSize fullSize = CGSizeMake(500, 500);
+    SDGraphicsImageRenderer *renderer = [[SDGraphicsImageRenderer alloc] initWithSize:fullSize];
+    UIImage *fullSizeImage = [renderer imageWithActions:^(CGContextRef  _Nonnull context) {
+        CGContextSetRGBFillColor(context, 1.0, 0.0, 0.0, 1.0);
+        CGContextSetRGBStrokeColor(context, 1.0, 0.0, 0.0, 1.0);
+        CGContextFillRect(context, CGRectMake(0, 0, fullSize.width, fullSize.height));
+    }];
+    expect(fullSizeImage.size).equal(fullSize);
+    NSURL *url = [NSURL URLWithString:@"https://placehold.co/500x500.png"];
+    NSString *fullSizeKey = [SDWebImageManager.sharedManager cacheKeyForURL:url];
+    NSData *fullSizeData = fullSizeImage.sd_imageData;
+    [SDImageCache.sharedImageCache storeImageDataToDisk:fullSizeData forKey:fullSizeKey];
+    
+    CGSize thumbnailSize = CGSizeMake(100, 100);
+    NSString *thumbnailKey = SDThumbnailedKeyForKey(fullSizeKey, thumbnailSize, YES);
+    [SDImageCache.sharedImageCache removeImageFromDiskForKey:thumbnailKey];
+    // Load with thumbnail, should use full size cache instead to decode and scale down
+    [SDWebImageManager.sharedManager loadImageWithURL:url options:SDWebImageWaitStoreCache context:@{SDWebImageContextImageThumbnailPixelSize : @(thumbnailSize)} progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+        expect(image.size).equal(thumbnailSize);
+        expect(data).beNil(); // Currently, the thumbnailed and transformed image always data is nil, to avoid confuse user (the image and data represent no longer match)
+        expect(cacheType).equal(SDImageCacheTypeDisk);
+        expect(finished).beTruthy();
+        
+        // The thumbnail one should stored into memory and disk cache with thumbnail key as well
+        expect([SDImageCache.sharedImageCache imageFromMemoryCacheForKey:thumbnailKey].size).equal(thumbnailSize);
+        expect([SDImageCache.sharedImageCache imageFromDiskCacheForKey:thumbnailKey].size).equal(thumbnailSize);
+        
+        [expectation fulfill];
+    }];
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test19ThatDifferentThumbnailLoadShouldCallbackDifferentSize {
+    // 3. Current SDWebImageDownloader use the **URL** as primiary key to bind operation, however, different loading pipeline may ask different image size for same URL, this design does not match
+    // We move the logic into SDWebImageDownloaderOperation, which decode each callback's thumbnail size with different decoding pipeline, and callback independently
+    // Note the progressiveLoad does not support this and always callback first size
+    
+    NSURL *url = [NSURL URLWithString:@"https://placehold.co/501x501.png"];
+    NSString *fullSizeKey = [SDWebImageManager.sharedManager cacheKeyForURL:url];
+    [SDImageCache.sharedImageCache removeImageFromDiskForKey:fullSizeKey];
+    for (int i = 490; i < 500; i++) {
+        // 490x490, ..., 499x499
+        CGSize thumbnailSize = CGSizeMake(i, i);
+        NSString *thumbnailKey = SDThumbnailedKeyForKey(fullSizeKey, thumbnailSize, YES);
+        [SDImageCache.sharedImageCache removeImageFromDiskForKey:thumbnailKey];
+        XCTestExpectation *expectation = [self expectationWithDescription:[NSString stringWithFormat:@"Different thumbnail loading for same URL should callback different image size: (%dx%d)", i, i]];
+        [SDImageCache.sharedImageCache removeImageFromDiskForKey:url.absoluteString];
+        __block SDWebImageCombinedOperation *operation;
+        operation = [SDWebImageManager.sharedManager loadImageWithURL:url options:0 context:@{SDWebImageContextImageThumbnailPixelSize : @(thumbnailSize)} progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+            expect(image.size).equal(thumbnailSize);
+            expect(data).beNil(); // Currently, the thumbnailed and transformed image always data is nil, to avoid confuse user (the image and data represent no longer match)
+            expect(cacheType).equal(SDImageCacheTypeNone);
+            expect(finished).beTruthy();
+            
+            NSURLRequest *request = ((SDWebImageDownloadToken *)operation.loaderOperation).request;
+            NSLog(@"thumbnail image size: (%dx%d) loaded with the shared request: %p", i, i, request);
+            [expectation fulfill];
+        }];
+    }
+    
+    [self waitForExpectationsWithTimeout:kAsyncTestTimeout * 5 handler:nil];
+}
+
+- (void)test20ThatContextPassDecodeOptionsWorks {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"The SDWebImageContextImageDecodeOptions should passed to the coder"];
+    NSURL *url = [NSURL URLWithString:@"https://placehold.co/502x502.png"];
+    SDImageCoderOptions *originalDecodeOptions = @{@"Foo": @"Bar", SDImageCoderDecodeScaleFactor : @(2)}; // This will be override
+    
+    [SDWebImageManager.sharedManager loadImageWithURL:url options:0 context:@{SDWebImageContextImageScaleFactor : @(1), SDWebImageContextImageDecodeOptions : originalDecodeOptions} progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+        SDImageCoderOptions *decodeOptions = image.sd_decodeOptions;
+        expect(decodeOptions.count).beGreaterThan(originalDecodeOptions.count);
+        expect(decodeOptions[@"Foo"]).equal(@"Bar");
+        expect(decodeOptions[SDImageCoderDecodeScaleFactor]).equal(1);
+        [expectation fulfill];
+    }];
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test21ThatQueryOriginalDiskCacheFromThumbnailShouldNotWriteBackDiskCache {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Using original disk cache to do thumbnail decoding or transformer, should not save back disk data again"];
+    
+    NSURL *url = [NSURL URLWithString:@"https://placehold.co/503x503.png"];
+    NSString *originalKey = url.absoluteString;
+    // 1. Store the disk data to original cache
+    CGSize fullSize = CGSizeMake(503, 503);
+    SDGraphicsImageRenderer *renderer = [[SDGraphicsImageRenderer alloc] initWithSize:fullSize];
+    UIImage *fullSizeImage = [renderer imageWithActions:^(CGContextRef  _Nonnull context) {
+        CGContextSetRGBFillColor(context, 1.0, 0.0, 0.0, 1.0);
+        CGContextSetRGBStrokeColor(context, 1.0, 0.0, 0.0, 1.0);
+        CGContextFillRect(context, CGRectMake(0, 0, fullSize.width, fullSize.height));
+    }];
+    NSData *fullSizeData = fullSizeImage.sd_imageData;
+    [SDImageCache.sharedImageCache storeImageDataToDisk:fullSizeData forKey:originalKey];
+    
+    // 2. Query thumbnail size, should hit full disk cache instead of download
+    SDWebImageContext *context = @{
+        SDWebImageContextImageThumbnailPixelSize: @(CGSizeMake(100, 100)),
+        SDWebImageContextOriginalQueryCacheType: @(SDImageCacheTypeAll),
+        SDWebImageContextOriginalStoreCacheType: @(SDImageCacheTypeDisk),
+        SDWebImageContextQueryCacheType: @(SDImageCacheTypeAll),
+        SDWebImageContextStoreCacheType: @(SDImageCacheTypeAll) // these 4 are all default values
+    };
+    NSString *key = [SDWebImageManager.sharedManager cacheKeyForURL:url context:context]; // Thumbnail key
+    [SDImageCache.sharedImageCache removeImageFromDiskForKey:key];
+    [SDWebImageManager.sharedManager loadImageWithURL:url options:SDWebImageWaitStoreCache context:context progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+        expect(cacheType).equal(SDImageCacheTypeDisk);
+        expect(data).beNil(); // Currently, the thumbnailed and transformed image always data is nil, to avoid confuse user (the image and data represent no longer match)
+        expect(image.size.width).equal(100);
+        expect(image.size.height).equal(100);
+        // 3. Check full size disk cache again, should equal to original stored one
+        NSData *currentFullSizeData = [SDImageCache.sharedImageCache diskImageDataForKey:originalKey];
+        expect(currentFullSizeData).equal(fullSizeData);
+        // 4. Some extra check that thumbnailed image should store to disk/memory as well to wait for next time query
+        expect([SDImageCache.sharedImageCache diskImageDataExistsWithKey:key]).beTruthy();
+        expect([SDImageCache.sharedImageCache imageFromMemoryCacheForKey:key]).beTruthy();
+        
+        [expectation fulfill];
+    }];
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test22ThatForceDecodePolicyAutomatic {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Automatic policy with ICC profile colorspace image should force-decode"];
+    NSString * testImagePath = [[NSBundle bundleForClass:[self class]] pathForResource:@"TestICCProfile" ofType:@"jpg"];
+    NSURL *url = [NSURL fileURLWithPath:testImagePath];
+    SDImageCoderHelper.defaultDecodeSolution = SDImageCoderDecodeSolutionCoreGraphics; // Temp set
+    [SDWebImageManager.sharedManager loadImageWithURL:url options:SDWebImageFromLoaderOnly context:@{SDWebImageContextImageForceDecodePolicy : @(SDImageForceDecodePolicyAutomatic)} progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
+        expect(image).notTo.beNil();
+        expect(image.sd_isDecoded).beTruthy();
+        CGImageRef cgImage = image.CGImage;
+        CGColorSpaceRef colorspace = CGImageGetColorSpace(cgImage);
+        expect(colorspace).equal([SDImageCoderHelper colorSpaceGetDeviceRGB]);
+        // Revert back
+        SDImageCoderHelper.defaultDecodeSolution = SDImageCoderDecodeSolutionAutomatic;
+        
+        [expectation fulfill];
+    }];
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (NSString *)testJPEGPath {
+    NSBundle *testBundle = [NSBundle bundleForClass:[self class]];
+    return [testBundle pathForResource:@"TestImage" ofType:@"jpg"];
+}
+
 @end
diff --git a/Tests/Tests/SDWebImagePrefetcherTests.m b/Tests/Tests/SDWebImagePrefetcherTests.m
index 4079547ac..7886ec2de 100644
--- a/Tests/Tests/SDWebImagePrefetcherTests.m
+++ b/Tests/Tests/SDWebImagePrefetcherTests.m
@@ -8,9 +8,19 @@
  */
 
 #import "SDTestCase.h"
-#import <SDWebImage/SDWebImagePrefetcher.h>
 
-@interface SDWebImagePrefetcherTests : SDTestCase
+@interface SDWebImagePrefetcher ()
+
+@property (strong, atomic, nonnull) NSMutableSet<SDWebImagePrefetchToken *> *runningTokens;
+
+@end
+
+@interface SDWebImagePrefetcherTests : SDTestCase <SDWebImagePrefetcherDelegate>
+
+@property (nonatomic, strong) SDWebImagePrefetcher *prefetcher;
+@property (atomic, assign) NSUInteger finishedCount;
+@property (atomic, assign) NSUInteger skippedCount;
+@property (atomic, assign) NSUInteger totalCount;
 
 @end
 
@@ -24,9 +34,9 @@ - (void)test01ThatSharedPrefetcherIsNotEqualToInitPrefetcher {
 - (void)test02PrefetchMultipleImages {
     XCTestExpectation *expectation = [self expectationWithDescription:@"Correct prefetch of multiple images"];
     
-    NSArray *imageURLs = @[@"http://via.placeholder.com/20x20.jpg",
-                           @"http://via.placeholder.com/30x30.jpg",
-                           @"http://via.placeholder.com/40x40.jpg"];
+    NSArray *imageURLs = @[@"https://placehold.co/20x20.jpg",
+                           @"https://placehold.co/30x30.jpg",
+                           @"https://placehold.co/40x40.jpg"];
     
     __block NSUInteger numberOfPrefetched = 0;
     
@@ -59,6 +69,123 @@ - (void)test03PrefetchWithEmptyArrayWillCallTheCompletionWithAllZeros {
     [self waitForExpectationsWithCommonTimeout];
 }
 
-// TODO: test the prefetcher delegate works
+- (void)test04PrefetchWithMultipleArrayDifferentQueueWorks {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Prefetch with multiple array at different queue failed"];
+    
+    NSArray *imageURLs1 = @[@"https://placehold.co/20x20.jpg",
+                            @"https://placehold.co/30x30.jpg"];
+    NSArray *imageURLs2 = @[@"https://placehold.co/30x30.jpg",
+                           @"https://placehold.co/40x40.jpg"];
+    dispatch_queue_t queue1 = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0);
+    dispatch_queue_t queue2 = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0);
+    __block int numberOfPrefetched1 = 0;
+    __block int numberOfPrefetched2 = 0;
+    __block BOOL prefetchFinished1 = NO;
+    __block BOOL prefetchFinished2 = NO;
+    
+    // Clear the disk cache to make it more realistic for multi-thread environment
+    [[SDImageCache sharedImageCache] clearDiskOnCompletion:^{
+        dispatch_async(queue1, ^{
+            [[SDWebImagePrefetcher sharedImagePrefetcher] prefetchURLs:imageURLs1 progress:^(NSUInteger noOfFinishedUrls, NSUInteger noOfTotalUrls) {
+                numberOfPrefetched1 += 1;
+            } completed:^(NSUInteger noOfFinishedUrls, NSUInteger noOfSkippedUrls) {
+                expect(numberOfPrefetched1).to.equal(noOfFinishedUrls);
+                prefetchFinished1 = YES;
+                // both completion called
+                if (prefetchFinished1 && prefetchFinished2) {
+                    [expectation fulfill];
+                }
+            }];
+        });
+        dispatch_async(queue2, ^{
+            [[SDWebImagePrefetcher sharedImagePrefetcher] prefetchURLs:imageURLs2 progress:^(NSUInteger noOfFinishedUrls, NSUInteger noOfTotalUrls) {
+                numberOfPrefetched2 += 1;
+            } completed:^(NSUInteger noOfFinishedUrls, NSUInteger noOfSkippedUrls) {
+                expect(numberOfPrefetched2).to.equal(noOfFinishedUrls);
+                prefetchFinished2 = YES;
+                // both completion called
+                if (prefetchFinished1 && prefetchFinished2) {
+                    [expectation fulfill];
+                }
+            }];
+        });
+    }];
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)test05PrefetchLargeURLsAndDelegateWorks {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Prefetch large URLs and delegate failed"];
+    
+    // This test also test large URLs and thread-safe problem. You can tested with 2000 urls and get the correct result locally. However, due to the limit of CI, 20 is enough.
+    NSMutableArray<NSURL *> *imageURLs = [NSMutableArray arrayWithCapacity:20];
+    for (size_t i = 1; i <= 20; i++) {
+        NSString *url = [NSString stringWithFormat:@"https://placehold.co/%zux%zu.jpg", i, i];
+        [imageURLs addObject:[NSURL URLWithString:url]];
+    }
+    self.prefetcher = [SDWebImagePrefetcher new];
+    self.prefetcher.delegate = self;
+    // Current implementation, the delegate method called before the progressBlock and completionBlock
+    [[SDImageCache sharedImageCache] clearDiskOnCompletion:^{
+        [self.prefetcher prefetchURLs:[imageURLs copy] progress:^(NSUInteger noOfFinishedUrls, NSUInteger noOfTotalUrls) {
+            expect(self.finishedCount).to.equal(noOfFinishedUrls);
+            expect(self.totalCount).to.equal(noOfTotalUrls);
+        } completed:^(NSUInteger noOfFinishedUrls, NSUInteger noOfSkippedUrls) {
+            expect(self.finishedCount).to.equal(noOfFinishedUrls);
+            expect(self.skippedCount).to.equal(noOfSkippedUrls);
+            [expectation fulfill];
+        }];
+    }];
+    
+    [self waitForExpectationsWithTimeout:kAsyncTestTimeout * 20 handler:nil];
+}
+
+- (void)test06PrefetchCancelToken {
+    NSArray *imageURLs = @[@"https://placehold.co/20x20.jpg",
+                           @"https://placehold.co/30x30.jpg",
+                           @"https://placehold.co/40x40.jpg"];
+    SDWebImagePrefetcher *prefetcher = [[SDWebImagePrefetcher alloc] init];
+    SDWebImagePrefetchToken *token = [prefetcher prefetchURLs:imageURLs];
+    expect(prefetcher.runningTokens.count).equal(1);
+    [token cancel];
+    expect(prefetcher.runningTokens.count).equal(0);
+}
+
+- (void)test07DownloaderCancelDuringPrefetching {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Downloader cancel during prefetch should not hung up"];
+    
+    NSArray *imageURLs = @[@"https://placehold.co/5000x5000.jpg",
+                           @"https://placehold.co/6000x6000.jpg",
+                           @"https://placehold.co/7000x7000.jpg"];
+    for (NSString *url in imageURLs) {
+        [SDImageCache.sharedImageCache removeImageFromDiskForKey:url];
+    }
+    SDWebImagePrefetcher *prefetcher = [[SDWebImagePrefetcher alloc] init];
+    prefetcher.maxConcurrentPrefetchCount = 3;
+    [prefetcher prefetchURLs:imageURLs progress:nil completed:^(NSUInteger noOfFinishedUrls, NSUInteger noOfSkippedUrls) {
+        expect(noOfSkippedUrls).equal(3);
+        [expectation fulfill];
+    }];
+    
+    // Cancel all download, should not effect the prefetcher logic or cause hung up
+    // Prefetch is not sync, so using wait for testing
+    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, kMinDelayNanosecond), dispatch_get_main_queue(), ^{
+        [SDWebImageDownloader.sharedDownloader cancelAllDownloads];
+    });
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
+- (void)imagePrefetcher:(SDWebImagePrefetcher *)imagePrefetcher didFinishWithTotalCount:(NSUInteger)totalCount skippedCount:(NSUInteger)skippedCount {
+    expect(imagePrefetcher).to.equal(self.prefetcher);
+    self.skippedCount = skippedCount;
+    self.totalCount = totalCount;
+}
+
+- (void)imagePrefetcher:(SDWebImagePrefetcher *)imagePrefetcher didPrefetchURL:(NSURL *)imageURL finishedCount:(NSUInteger)finishedCount totalCount:(NSUInteger)totalCount {
+    expect(imagePrefetcher).to.equal(self.prefetcher);
+    self.finishedCount = finishedCount;
+    self.totalCount = totalCount;
+}
 
 @end
diff --git a/Tests/Tests/SDWebImageTestCache.h b/Tests/Tests/SDWebImageTestCache.h
new file mode 100644
index 000000000..6c900c6fc
--- /dev/null
+++ b/Tests/Tests/SDWebImageTestCache.h
@@ -0,0 +1,41 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ * (c) Matt Galloway
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <SDWebImage/SDMemoryCache.h>
+#import <SDWebImage/SDDiskCache.h>
+#import <SDWebImage/SDImageCacheDefine.h>
+
+// A really naive implementation of custom memory cache and disk cache
+@interface SDWebImageTestMemoryCache : NSObject <SDMemoryCache>
+
+@property (nonatomic, strong, nonnull) SDImageCacheConfig *config;
+@property (nonatomic, strong, nonnull) NSCache *cache;
+
+@end
+
+@interface SDWebImageTestDiskCache : NSObject <SDDiskCache>
+
+@property (nonatomic, strong, nonnull) SDImageCacheConfig *config;
+@property (nonatomic, copy, nonnull) NSString *cachePath;
+@property (nonatomic, strong, nonnull) NSFileManager *fileManager;
+
+@end
+
+// A really naive implementation of custom image cache using memory cache and disk cache
+@interface SDWebImageTestCache : NSObject <SDImageCache>
+
+@property (nonatomic, strong, nonnull) SDImageCacheConfig *config;
+@property (nonatomic, strong, nonnull) SDWebImageTestMemoryCache *memoryCache;
+@property (nonatomic, strong, nonnull) SDWebImageTestDiskCache *diskCache;
+
+- (nullable instancetype)initWithCachePath:(nonnull NSString *)cachePath config:(nonnull SDImageCacheConfig *)config;
+
+@property (nonatomic, class, readonly, nonnull) SDWebImageTestCache *sharedCache;
+
+@end
diff --git a/Tests/Tests/SDWebImageTestCache.m b/Tests/Tests/SDWebImageTestCache.m
new file mode 100644
index 000000000..5e97cc39d
--- /dev/null
+++ b/Tests/Tests/SDWebImageTestCache.m
@@ -0,0 +1,336 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ * (c) Matt Galloway
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageTestCache.h"
+#import <SDWebImage/SDWebImage.h>
+#import "SDFileAttributeHelper.h"
+
+static NSString * const SDWebImageTestDiskCacheExtendedAttributeName = @"com.hackemist.SDWebImageTestDiskCache";
+
+@implementation SDWebImageTestMemoryCache
+
+- (nonnull instancetype)initWithConfig:(nonnull SDImageCacheConfig *)config {
+    self = [super init];
+    if (self) {
+        self.config = config;
+        self.cache = [[NSCache alloc] init];
+    }
+    return self;
+}
+
+- (nullable id)objectForKey:(nonnull id)key {
+    return [self.cache objectForKey:key];
+}
+
+- (void)removeAllObjects {
+    [self.cache removeAllObjects];
+}
+
+- (void)removeObjectForKey:(nonnull id)key {
+    [self.cache removeObjectForKey:key];
+}
+
+- (void)setObject:(nullable id)object forKey:(nonnull id)key {
+    [self.cache setObject:object forKey:key];
+}
+
+- (void)setObject:(nullable id)object forKey:(nonnull id)key cost:(NSUInteger)cost {
+    [self.cache setObject:object forKey:key cost:cost];
+}
+
+@end
+
+@implementation SDWebImageTestDiskCache
+
+- (nullable NSString *)cachePathForKey:(nonnull NSString *)key {
+    return [self.cachePath stringByAppendingPathComponent:key.lastPathComponent];
+}
+
+- (BOOL)containsDataForKey:(nonnull NSString *)key {
+    return [self.fileManager fileExistsAtPath:[self cachePathForKey:key]];
+}
+
+- (nullable NSData *)dataForKey:(nonnull NSString *)key {
+    return [self.fileManager contentsAtPath:[self cachePathForKey:key]];
+}
+
+- (nullable instancetype)initWithCachePath:(nonnull NSString *)cachePath config:(nonnull SDImageCacheConfig *)config {
+    self = [super init];
+    if (self) {
+        self.cachePath = cachePath;
+        self.config = config;
+        self.fileManager = config.fileManager ? config.fileManager : [NSFileManager new];
+        [self.fileManager createDirectoryAtPath:self.cachePath withIntermediateDirectories:YES attributes:nil error:nil];
+    }
+    return self;
+}
+
+- (void)removeAllData {
+    NSURL *srcURL = [NSURL fileURLWithPath:self.cachePath isDirectory:YES];
+    NSDirectoryEnumerator<NSURL *> *fileEnumerator = [self.fileManager enumeratorAtURL:srcURL
+                                                  includingPropertiesForKeys:@[]
+                                                                     options:(NSDirectoryEnumerationOptions)0
+                                                                errorHandler:NULL];
+    for (NSURL *url in fileEnumerator) {
+        @autoreleasepool {
+            [self.fileManager removeItemAtURL:url error:nil];
+        }
+    }
+}
+
+- (void)removeDataForKey:(nonnull NSString *)key {
+    [self.fileManager removeItemAtPath:[self cachePathForKey:key] error:nil];
+}
+
+- (void)removeExpiredData {
+    NSDate *expirationDate = [NSDate dateWithTimeIntervalSinceNow:-self.config.maxDiskAge];
+    NSURL *diskCacheURL = [NSURL fileURLWithPath:self.cachePath isDirectory:YES];
+    NSArray<NSString *> *resourceKeys = @[NSURLIsDirectoryKey, NSURLContentAccessDateKey];
+    NSDirectoryEnumerator<NSURL *> *fileEnumerator = [self.fileManager enumeratorAtURL:diskCacheURL
+                                                   includingPropertiesForKeys:resourceKeys
+                                                                      options:NSDirectoryEnumerationSkipsHiddenFiles
+                                                                 errorHandler:NULL];
+    
+    for (NSURL *fileURL in fileEnumerator) {
+        @autoreleasepool {
+            NSError *error;
+            NSDictionary<NSString *, id> *resourceValues = [fileURL resourceValuesForKeys:resourceKeys error:&error];
+            
+            // Skip directories and errors.
+            if (error || !resourceValues || [resourceValues[NSURLIsDirectoryKey] boolValue]) {
+                continue;;
+            }
+            
+            // Remove files that are older than the expiration date;
+            NSDate *accessDate = resourceValues[NSURLContentAccessDateKey];
+            if (expirationDate && [[accessDate laterDate:expirationDate] isEqualToDate:expirationDate]) {
+                [self.fileManager removeItemAtURL:fileURL error:nil];
+            }
+        }
+    }
+}
+
+- (void)setData:(nullable NSData *)data forKey:(nonnull NSString *)key {
+    [self.fileManager createFileAtPath:[self cachePathForKey:key] contents:data attributes:nil];
+}
+
+- (NSUInteger)totalCount {
+    NSUInteger count = 0;
+    @autoreleasepool {
+        count = [self.fileManager contentsOfDirectoryAtPath:self.cachePath error:nil].count;
+    }
+    return count;
+}
+
+- (NSUInteger)totalSize {
+    NSUInteger size = 0;
+    @autoreleasepool {
+        NSURL *pathURL = [NSURL fileURLWithPath:self.cachePath isDirectory:YES];
+        NSDirectoryEnumerator<NSURL *> *fileEnumerator = [self.fileManager enumeratorAtURL:pathURL
+                                                  includingPropertiesForKeys:@[NSURLFileSizeKey]
+                                                                     options:(NSDirectoryEnumerationOptions)0
+                                                                errorHandler:NULL];
+        
+        for (NSURL *fileURL in fileEnumerator) {
+            @autoreleasepool {
+                NSNumber *fileSize;
+                [fileURL getResourceValue:&fileSize forKey:NSURLFileSizeKey error:NULL];
+                size += fileSize.unsignedIntegerValue;
+            }
+        }
+    }
+    return size;
+}
+
+- (nullable NSData *)extendedDataForKey:(nonnull NSString *)key {
+    NSString *cachePathForKey = [self cachePathForKey:key];
+    return [SDFileAttributeHelper extendedAttribute:SDWebImageTestDiskCacheExtendedAttributeName atPath:cachePathForKey traverseLink:NO error:nil];
+}
+
+- (void)setExtendedData:(nullable NSData *)extendedData forKey:(nonnull NSString *)key {
+    NSString *cachePathForKey = [self cachePathForKey:key];
+    if (!extendedData) {
+        [SDFileAttributeHelper removeExtendedAttribute:SDWebImageTestDiskCacheExtendedAttributeName atPath:cachePathForKey traverseLink:NO error:nil];
+    } else {
+        [SDFileAttributeHelper setExtendedAttribute:SDWebImageTestDiskCacheExtendedAttributeName value:extendedData atPath:cachePathForKey traverseLink:NO overwrite:YES error:nil];
+    }
+}
+
+@end
+
+@implementation SDWebImageTestCache
+
++ (SDWebImageTestCache *)sharedCache {
+    static dispatch_once_t onceToken;
+    static SDWebImageTestCache *cache;
+    dispatch_once(&onceToken, ^{
+        NSString *cachePath = [[self userCacheDirectory] stringByAppendingPathComponent:@"SDWebImageTestCache"];
+        SDImageCacheConfig *config = SDImageCacheConfig.defaultCacheConfig;
+        cache = [[SDWebImageTestCache alloc] initWithCachePath:cachePath config:config];
+    });
+    return cache;
+}
+
+- (instancetype)initWithCachePath:(NSString *)cachePath config:(SDImageCacheConfig *)config {
+    self = [super init];
+    if (self) {
+        self.config = config;
+        self.memoryCache = [[SDWebImageTestMemoryCache alloc] initWithConfig:config];
+        self.diskCache = [[SDWebImageTestDiskCache alloc] initWithCachePath:cachePath config:config];
+    }
+    return self;
+}
+
+- (void)clearWithCacheType:(SDImageCacheType)cacheType completion:(nullable SDWebImageNoParamsBlock)completionBlock {
+    switch (cacheType) {
+        case SDImageCacheTypeNone:
+            break;
+        case SDImageCacheTypeMemory:
+            [self.memoryCache removeAllObjects];
+            break;
+        case SDImageCacheTypeDisk:
+            [self.diskCache removeAllData];
+            break;
+        case SDImageCacheTypeAll:
+            [self.memoryCache removeAllObjects];
+            [self.diskCache removeAllData];
+            break;
+        default:
+            break;
+    }
+    if (completionBlock) {
+        completionBlock();
+    }
+}
+
+- (void)containsImageForKey:(nullable NSString *)key cacheType:(SDImageCacheType)cacheType completion:(nullable SDImageCacheContainsCompletionBlock)completionBlock {
+    SDImageCacheType containsCacheType = SDImageCacheTypeNone;
+    switch (cacheType) {
+        case SDImageCacheTypeNone:
+            break;
+        case SDImageCacheTypeMemory:
+            containsCacheType = [self.memoryCache objectForKey:key] ? SDImageCacheTypeMemory : SDImageCacheTypeNone;
+            break;
+        case SDImageCacheTypeDisk:
+            containsCacheType = [self.diskCache containsDataForKey:key] ? SDImageCacheTypeDisk : SDImageCacheTypeNone;
+            break;
+        case SDImageCacheTypeAll:
+            if ([self.memoryCache objectForKey:key]) {
+                containsCacheType = SDImageCacheTypeMemory;
+            } else if ([self.diskCache containsDataForKey:key]) {
+                containsCacheType = SDImageCacheTypeDisk;
+            }
+            break;
+        default:
+            break;
+    }
+    if (completionBlock) {
+        completionBlock(containsCacheType);
+    }
+}
+
+- (nullable id<SDWebImageOperation>)queryImageForKey:(nullable NSString *)key options:(SDWebImageOptions)options context:(nullable SDWebImageContext *)context completion:(nullable SDImageCacheQueryCompletionBlock)completionBlock {
+    return [self queryImageForKey:key options:options context:context cacheType:SDImageCacheTypeAll completion:completionBlock];
+}
+
+- (nullable id<SDWebImageOperation>)queryImageForKey:(nullable NSString *)key options:(SDWebImageOptions)options context:(nullable SDWebImageContext *)context cacheType:(SDImageCacheType)cacheType completion:(nullable SDImageCacheQueryCompletionBlock)completionBlock {
+    UIImage *image;
+    NSData *data;
+    SDImageCacheType resultCacheType = SDImageCacheTypeNone;
+    switch (cacheType) {
+        case SDImageCacheTypeNone:
+            break;
+        case SDImageCacheTypeMemory:
+            image = [self.memoryCache objectForKey:key];
+            if (image) {
+                resultCacheType = SDImageCacheTypeMemory;
+            }
+            break;
+        case SDImageCacheTypeDisk:
+            data = [self.diskCache dataForKey:key];
+            image = [UIImage sd_imageWithData:data];
+            if (data) {
+                resultCacheType = SDImageCacheTypeDisk;
+            }
+            break;
+        case SDImageCacheTypeAll:
+            image = [self.memoryCache objectForKey:key];
+            if (image) {
+                resultCacheType = SDImageCacheTypeMemory;
+            } else {
+                data = [self.diskCache dataForKey:key];
+                image = [UIImage sd_imageWithData:data];
+                if (data) {
+                    resultCacheType = SDImageCacheTypeDisk;
+                }
+            }
+            break;
+        default:
+            break;
+    }
+    if (completionBlock) {
+        completionBlock(image, data, resultCacheType);
+    }
+    return nil;
+}
+
+- (void)removeImageForKey:(nullable NSString *)key cacheType:(SDImageCacheType)cacheType completion:(nullable SDWebImageNoParamsBlock)completionBlock {
+    switch (cacheType) {
+        case SDImageCacheTypeNone:
+            break;
+        case SDImageCacheTypeMemory:
+            [self.memoryCache removeObjectForKey:key];
+            break;
+        case SDImageCacheTypeDisk:
+            [self.diskCache removeDataForKey:key];
+            break;
+        case SDImageCacheTypeAll:
+            [self.memoryCache removeObjectForKey:key];
+            [self.diskCache removeDataForKey:key];
+            break;
+        default:
+            break;
+    }
+    if (completionBlock) {
+        completionBlock();
+    }
+}
+
+- (void)storeImage:(nullable UIImage *)image imageData:(nullable NSData *)imageData forKey:(nullable NSString *)key cacheType:(SDImageCacheType)cacheType completion:(nullable SDWebImageNoParamsBlock)completionBlock {
+    [self storeImage:image imageData:imageData forKey:key options:0 context:nil cacheType:cacheType completion:completionBlock];
+}
+
+- (void)storeImage:(nullable UIImage *)image imageData:(nullable NSData *)imageData forKey:(nullable NSString *)key options:(SDWebImageOptions)options context:(nullable SDWebImageContext *)context cacheType:(SDImageCacheType)cacheType completion:(nullable SDWebImageNoParamsBlock)completionBlock {
+    switch (cacheType) {
+        case SDImageCacheTypeNone:
+            break;
+        case SDImageCacheTypeMemory:
+            [self.memoryCache setObject:image forKey:key];
+            break;
+        case SDImageCacheTypeDisk:
+            [self.diskCache setData:imageData forKey:key];
+            break;
+        case SDImageCacheTypeAll:
+            [self.memoryCache setObject:image forKey:key];
+            [self.diskCache setData:imageData forKey:key];
+            break;
+        default:
+            break;
+    }
+    if (completionBlock) {
+        completionBlock();
+    }
+}
+
++ (nullable NSString *)userCacheDirectory {
+    NSArray<NSString *> *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
+    return paths.firstObject;
+}
+
+@end
diff --git a/Tests/Tests/SDWebImageTestDecoder.h b/Tests/Tests/SDWebImageTestCoder.h
similarity index 73%
rename from Tests/Tests/SDWebImageTestDecoder.h
rename to Tests/Tests/SDWebImageTestCoder.h
index 29ea56441..d822b1e29 100644
--- a/Tests/Tests/SDWebImageTestDecoder.h
+++ b/Tests/Tests/SDWebImageTestCoder.h
@@ -8,8 +8,8 @@
  */
 
 #import <Foundation/Foundation.h>
-#import <SDWebImage/SDWebImageCoder.h>
+#import <SDWebImage/SDImageCoder.h>
 
-@interface SDWebImageTestDecoder : NSObject <SDWebImageCoder>
+@interface SDWebImageTestCoder : NSObject <SDProgressiveImageCoder>
 
 @end
diff --git a/Tests/Tests/SDWebImageTestDecoder.m b/Tests/Tests/SDWebImageTestCoder.m
similarity index 52%
rename from Tests/Tests/SDWebImageTestDecoder.m
rename to Tests/Tests/SDWebImageTestCoder.m
index 5bf42da40..cfe7490ff 100644
--- a/Tests/Tests/SDWebImageTestDecoder.m
+++ b/Tests/Tests/SDWebImageTestCoder.m
@@ -7,9 +7,9 @@
  * file that was distributed with this source code.
  */
 
-#import "SDWebImageTestDecoder.h"
+#import "SDWebImageTestCoder.h"
 
-@implementation SDWebImageTestDecoder
+@implementation SDWebImageTestCoder
 
 - (BOOL)canDecodeFromData:(nullable NSData *)data {
     return YES;
@@ -19,29 +19,35 @@ - (BOOL)canEncodeToFormat:(SDImageFormat)format {
     return YES;
 }
 
-- (UIImage *)decodedImageWithData:(NSData *)data {
+- (UIImage *)decodedImageWithData:(NSData *)data options:(nullable SDImageCoderOptions *)options {
     NSString * testImagePath = [[NSBundle bundleForClass:[self class]] pathForResource:@"TestImage" ofType:@"jpg"];
-    UIImage *image = [UIImage imageWithContentsOfFile:testImagePath];
+    UIImage *image = [[UIImage alloc] initWithContentsOfFile:testImagePath];
     return image;
 }
 
-- (UIImage *)incrementallyDecodedImageWithData:(NSData *)data finished:(BOOL)finished {
+- (instancetype)initIncrementalWithOptions:(nullable SDImageCoderOptions *)options
+{
+    self = [super init];
+    if (self) {
+    }
+    return self;
+}
+
+- (void)updateIncrementalData:(NSData *)data finished:(BOOL)finished {
+    return;
+}
+
+- (UIImage *)incrementalDecodedImageWithOptions:(SDImageCoderOptions *)options {
     NSString * testImagePath = [[NSBundle bundleForClass:[self class]] pathForResource:@"TestImage" ofType:@"gif"];
-    UIImage *image = [UIImage imageWithContentsOfFile:testImagePath];
+    UIImage *image = [[UIImage alloc] initWithContentsOfFile:testImagePath];
     return image;
 }
 
-- (UIImage *)decompressedImageWithImage:(UIImage *)image
-                                   data:(NSData *__autoreleasing  _Nullable *)data
-                                options:(nullable NSDictionary<NSString*, NSObject*>*)optionsDict {
-    NSString *testString = @"TestDecompress";
-    NSData *testData = [testString dataUsingEncoding:NSUTF8StringEncoding];
-    *data = testData;
-    
-    return image;
+- (BOOL)canIncrementalDecodeFromData:(NSData *)data {
+    return YES;
 }
 
-- (NSData *)encodedDataWithImage:(UIImage *)image format:(SDImageFormat)format {
+- (NSData *)encodedDataWithImage:(UIImage *)image format:(SDImageFormat)format options:(nullable SDImageCoderOptions *)options {
     NSString *testString = @"TestEncode";
     NSData *data = [testString dataUsingEncoding:NSUTF8StringEncoding];
     return data;
diff --git a/Tests/Tests/SDWebImageTestDownloadOperation.h b/Tests/Tests/SDWebImageTestDownloadOperation.h
new file mode 100644
index 000000000..6ecba3282
--- /dev/null
+++ b/Tests/Tests/SDWebImageTestDownloadOperation.h
@@ -0,0 +1,21 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ * (c) Matt Galloway
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import <SDWebImage/SDWebImageDownloaderOperation.h>
+
+/**
+ *  A class that fits the NSOperation+SDWebImageDownloaderOperation requirement so we can test
+ */
+@interface SDWebImageTestDownloadOperation : NSOperation <SDWebImageDownloaderOperation>
+
+@property (nonatomic, strong, nullable) NSURLRequest *request;
+@property (nonatomic, strong, nullable) NSURLResponse *response;
+
+@end
diff --git a/Tests/Tests/SDWebImageTestDownloadOperation.m b/Tests/Tests/SDWebImageTestDownloadOperation.m
new file mode 100644
index 000000000..726d5e36f
--- /dev/null
+++ b/Tests/Tests/SDWebImageTestDownloadOperation.m
@@ -0,0 +1,87 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ * (c) Matt Galloway
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageTestDownloadOperation.h"
+
+@interface SDWebImageTestDownloadOperation ()
+
+@property (nonatomic, strong) NSMutableArray<SDWebImageDownloaderCompletedBlock> *completedBlocks;
+
+@end
+
+@implementation SDWebImageTestDownloadOperation
+
+@synthesize executing = _executing;
+@synthesize finished = _finished;
+
+- (void)start {
+    self.finished = NO;
+    self.executing = YES;
+    // Do nothing but keep running
+}
+
+- (void)cancel {
+    if (self.isFinished) return;
+    [super cancel];
+    
+    NSError *error = [NSError errorWithDomain:NSURLErrorDomain code:NSURLErrorCancelled userInfo:nil];
+    for (SDWebImageDownloaderCompletedBlock completedBlock in self.completedBlocks) {
+        completedBlock(nil, nil, error, YES);
+    }
+}
+
+- (BOOL)isAsynchronous {
+    return YES;
+}
+
+- (void)setFinished:(BOOL)finished {
+    [self willChangeValueForKey:@"isFinished"];
+    _finished = finished;
+    [self didChangeValueForKey:@"isFinished"];
+}
+
+- (void)setExecuting:(BOOL)executing {
+    [self willChangeValueForKey:@"isExecuting"];
+    _executing = executing;
+    [self didChangeValueForKey:@"isExecuting"];
+}
+
+- (instancetype)initWithRequest:(NSURLRequest *)request inSession:(NSURLSession *)session options:(SDWebImageDownloaderOptions)options {
+    return [self initWithRequest:request inSession:session options:options context:nil];
+}
+
+- (instancetype)initWithRequest:(NSURLRequest *)request inSession:(NSURLSession *)session options:(SDWebImageDownloaderOptions)options context:(SDWebImageContext *)context {
+    self = [super init];
+    if (self) {
+        self.request = request;
+        self.completedBlocks = [NSMutableArray array];
+    }
+    return self;
+}
+
+- (nullable id)addHandlersForProgress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                            completed:(nullable SDWebImageDownloaderCompletedBlock)completedBlock {
+    return [self addHandlersForProgress:progressBlock completed:completedBlock decodeOptions:nil];
+}
+
+- (nullable id)addHandlersForProgress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                            completed:(nullable SDWebImageDownloaderCompletedBlock)completedBlock
+                        decodeOptions:(nullable SDImageCoderOptions *)decodeOptions {
+    if (completedBlock) {
+        [self.completedBlocks addObject:completedBlock];
+    }
+    return NSStringFromClass([self class]);
+}
+
+- (BOOL)cancel:(id)token {
+    [self cancel];
+    return YES;
+}
+
+@end
diff --git a/Tests/Tests/SDWebImageTestLoader.h b/Tests/Tests/SDWebImageTestLoader.h
new file mode 100644
index 000000000..bd343cd8e
--- /dev/null
+++ b/Tests/Tests/SDWebImageTestLoader.h
@@ -0,0 +1,18 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ * (c) Matt Galloway
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import <SDWebImage/SDImageLoader.h>
+
+// A really naive implementation of custom image loader using `NSURLSession`
+@interface SDWebImageTestLoader : NSObject <SDImageLoader>
+
+@property (nonatomic, class, readonly, nonnull) SDWebImageTestLoader *sharedLoader;
+
+@end
diff --git a/Tests/Tests/SDWebImageTestLoader.m b/Tests/Tests/SDWebImageTestLoader.m
new file mode 100644
index 000000000..89cc3ce55
--- /dev/null
+++ b/Tests/Tests/SDWebImageTestLoader.m
@@ -0,0 +1,74 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ * (c) Matt Galloway
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageTestLoader.h"
+#import <KVOController/KVOController.h>
+
+@interface NSURLSessionTask (SDWebImageOperation) <SDWebImageOperation>
+
+@end
+
+@implementation SDWebImageTestLoader
+
++ (SDWebImageTestLoader *)sharedLoader {
+    static dispatch_once_t onceToken;
+    static SDWebImageTestLoader *loader;
+    dispatch_once(&onceToken, ^{
+        loader = [[SDWebImageTestLoader alloc] init];
+    });
+    return loader;
+}
+
+- (BOOL)canRequestImageForURL:(NSURL *)url {
+    return [self canRequestImageForURL:url options:0 context:nil];
+}
+
+- (BOOL)canRequestImageForURL:(NSURL *)url options:(SDWebImageOptions)options context:(SDWebImageContext *)context {
+    return YES;
+}
+
+- (id<SDWebImageOperation>)requestImageWithURL:(NSURL *)url options:(SDWebImageOptions)options context:(SDWebImageContext *)context progress:(SDImageLoaderProgressBlock)progressBlock completed:(SDImageLoaderCompletedBlock)completedBlock {
+    NSURLRequest *request = [NSURLRequest requestWithURL:url];
+    
+    NSURLSessionDataTask *task = [[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
+        if (data) {
+            dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
+                UIImage *image = SDImageLoaderDecodeImageData(data, url, options, context);
+                if (completedBlock) {
+                    completedBlock(image, data, nil, YES);
+                }
+            });
+        } else {
+            if (completedBlock) {
+                completedBlock(nil, nil, error, YES);
+            }
+        }
+    }];
+    [self.KVOController observe:task keyPath:NSStringFromSelector(@selector(countOfBytesReceived)) options:NSKeyValueObservingOptionNew block:^(id  _Nullable observer, id  _Nonnull object, NSDictionary<NSString *,id> * _Nonnull change) {
+        NSURLSessionTask *sessionTask = object;
+        NSInteger receivedSize = sessionTask.countOfBytesReceived;
+        NSInteger expectedSize = sessionTask.countOfBytesExpectedToReceive;
+        if (progressBlock) {
+            progressBlock(receivedSize, expectedSize, url);
+        }
+    }];
+    [task resume];
+    
+    return task;
+}
+
+- (BOOL)shouldBlockFailedURLWithURL:(NSURL *)url error:(NSError *)error {
+    return [self shouldBlockFailedURLWithURL:url error:error options:0 context:nil];
+}
+
+- (BOOL)shouldBlockFailedURLWithURL:(NSURL *)url error:(NSError *)error options:(SDWebImageOptions)options context:(SDWebImageContext *)context {
+    return NO;
+}
+
+@end
diff --git a/Tests/Tests/SDWebImageTestTransformer.h b/Tests/Tests/SDWebImageTestTransformer.h
new file mode 100644
index 000000000..be8a8024a
--- /dev/null
+++ b/Tests/Tests/SDWebImageTestTransformer.h
@@ -0,0 +1,16 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ * (c) Matt Galloway
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <SDWebImage/SDImageTransformer.h>
+
+@interface SDWebImageTestTransformer : SDImageBaseTransformer
+
+@property (nonatomic, strong, nullable) UIImage *testImage;
+
+@end
diff --git a/Tests/Tests/SDWebImageTestTransformer.m b/Tests/Tests/SDWebImageTestTransformer.m
new file mode 100644
index 000000000..0afafe76d
--- /dev/null
+++ b/Tests/Tests/SDWebImageTestTransformer.m
@@ -0,0 +1,22 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ * (c) Matt Galloway
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageTestTransformer.h"
+
+@implementation SDWebImageTestTransformer
+
+- (NSString *)transformerKey {
+    return @"SDWebImageTestTransformer";
+}
+
+- (UIImage *)transformedImageWithImage:(UIImage *)image forKey:(NSString *)key {
+    return self.testImage;
+}
+
+@end
diff --git a/Tests/Tests/TestImage.png b/Tests/Tests/TestImage.png
deleted file mode 100644
index 9d9dd8774..000000000
Binary files a/Tests/Tests/TestImage.png and /dev/null differ
diff --git a/Tests/Tests/en.lproj/InfoPlist.strings b/Tests/Tests/en.lproj/InfoPlist.strings
deleted file mode 100644
index 477b28ff8..000000000
--- a/Tests/Tests/en.lproj/InfoPlist.strings
+++ /dev/null
@@ -1,2 +0,0 @@
-/* Localized versions of Info.plist keys */
-
diff --git a/Vendors/FLAnimatedImage b/Vendors/FLAnimatedImage
deleted file mode 160000
index 25307796c..000000000
--- a/Vendors/FLAnimatedImage
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 25307796cfcf66cb5b98774e050e93f64e0f2cde
diff --git a/Vendors/libwebp b/Vendors/libwebp
deleted file mode 160000
index 50d1a848b..000000000
--- a/Vendors/libwebp
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 50d1a848bc56554af8413cfe681f94286a6371b3
diff --git a/WebImage/Info.plist b/WebImage/Info.plist
index d0da39953..e23763e40 100644
--- a/WebImage/Info.plist
+++ b/WebImage/Info.plist
@@ -15,11 +15,11 @@
 	<key>CFBundlePackageType</key>
 	<string>FMWK</string>
 	<key>CFBundleShortVersionString</key>
-	<string>4.4.2</string>
+	<string>5.21.7</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>
-	<string>4.4.2</string>
+	<string>5.21.7</string>
 	<key>NSPrincipalClass</key>
 	<string></string>
 </dict>
diff --git a/WebImage/PrivacyInfo.xcprivacy b/WebImage/PrivacyInfo.xcprivacy
new file mode 100644
index 000000000..276f7610d
--- /dev/null
+++ b/WebImage/PrivacyInfo.xcprivacy
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>NSPrivacyTracking</key>
+	<false/>
+	<key>NSPrivacyCollectedDataTypes</key>
+	<array/>
+	<key>NSPrivacyTrackingDomains</key>
+	<array/>
+	<key>NSPrivacyAccessedAPITypes</key>
+	<array>
+		<dict>
+			<key>NSPrivacyAccessedAPIType</key>
+			<string>NSPrivacyAccessedAPICategoryFileTimestamp</string>
+			<key>NSPrivacyAccessedAPITypeReasons</key>
+			<array>
+				<string>C617.1</string>
+			</array>
+		</dict>
+	</array>
+</dict>
+</plist>
diff --git a/WebImage/SDWebImage.h b/WebImage/SDWebImage.h
index 07c173e32..6bc9de802 100644
--- a/WebImage/SDWebImage.h
+++ b/WebImage/SDWebImage.h
@@ -9,64 +9,83 @@
 
 #import <SDWebImage/SDWebImageCompat.h>
 
-#if SD_UIKIT
-#import <UIKit/UIKit.h>
-#endif
-
-//! Project version number for WebImage.
-FOUNDATION_EXPORT double WebImageVersionNumber;
+//! Project version number for SDWebImage.
+FOUNDATION_EXPORT double SDWebImageVersionNumber;
 
-//! Project version string for WebImage.
-FOUNDATION_EXPORT const unsigned char WebImageVersionString[];
+//! Project version string for SDWebImage.
+FOUNDATION_EXPORT const unsigned char SDWebImageVersionString[];
 
-// In this header, you should import all the public headers of your framework using statements like #import <WebImage/PublicHeader.h>
+// In this header, you should import all the public headers of your framework using statements like #import <SDWebImage/PublicHeader.h>
 
 #import <SDWebImage/SDWebImageManager.h>
+#import <SDWebImage/SDCallbackQueue.h>
+#import <SDWebImage/SDWebImageCacheKeyFilter.h>
+#import <SDWebImage/SDWebImageCacheSerializer.h>
 #import <SDWebImage/SDImageCacheConfig.h>
 #import <SDWebImage/SDImageCache.h>
+#import <SDWebImage/SDMemoryCache.h>
+#import <SDWebImage/SDDiskCache.h>
+#import <SDWebImage/SDImageCacheDefine.h>
+#import <SDWebImage/SDImageCachesManager.h>
 #import <SDWebImage/UIView+WebCache.h>
 #import <SDWebImage/UIImageView+WebCache.h>
 #import <SDWebImage/UIImageView+HighlightedWebCache.h>
+#import <SDWebImage/SDWebImageDownloaderConfig.h>
 #import <SDWebImage/SDWebImageDownloaderOperation.h>
+#import <SDWebImage/SDWebImageDownloaderRequestModifier.h>
+#import <SDWebImage/SDWebImageDownloaderResponseModifier.h>
+#import <SDWebImage/SDWebImageDownloaderDecryptor.h>
+#import <SDWebImage/SDImageLoader.h>
+#import <SDWebImage/SDImageLoadersManager.h>
 #import <SDWebImage/UIButton+WebCache.h>
 #import <SDWebImage/SDWebImagePrefetcher.h>
 #import <SDWebImage/UIView+WebCacheOperation.h>
+#import <SDWebImage/UIView+WebCacheState.h>
+#import <SDWebImage/UIImage+Metadata.h>
 #import <SDWebImage/UIImage+MultiFormat.h>
+#import <SDWebImage/UIImage+MemoryCacheCost.h>
+#import <SDWebImage/UIImage+ExtendedCacheData.h>
 #import <SDWebImage/SDWebImageOperation.h>
 #import <SDWebImage/SDWebImageDownloader.h>
 #import <SDWebImage/SDWebImageTransition.h>
-
-#if SD_MAC || SD_UIKIT
-    #import <SDWebImage/MKAnnotationView+WebCache.h>
-#endif
-
-#import <SDWebImage/SDWebImageCodersManager.h>
-#import <SDWebImage/SDWebImageCoder.h>
-#import <SDWebImage/SDWebImageWebPCoder.h>
-#import <SDWebImage/SDWebImageGIFCoder.h>
-#import <SDWebImage/SDWebImageImageIOCoder.h>
-#import <SDWebImage/SDWebImageFrame.h>
-#import <SDWebImage/SDWebImageCoderHelper.h>
-#import <SDWebImage/UIImage+WebP.h>
+#import <SDWebImage/SDWebImageIndicator.h>
+#import <SDWebImage/SDImageTransformer.h>
+#import <SDWebImage/UIImage+Transform.h>
+#import <SDWebImage/SDAnimatedImage.h>
+#import <SDWebImage/SDAnimatedImageView.h>
+#import <SDWebImage/SDAnimatedImageView+WebCache.h>
+#import <SDWebImage/SDAnimatedImagePlayer.h>
+#import <SDWebImage/SDImageCodersManager.h>
+#import <SDWebImage/SDImageCoder.h>
+#import <SDWebImage/SDImageAPNGCoder.h>
+#import <SDWebImage/SDImageGIFCoder.h>
+#import <SDWebImage/SDImageIOCoder.h>
+#import <SDWebImage/SDImageFrame.h>
+#import <SDWebImage/SDImageCoderHelper.h>
+#import <SDWebImage/SDImageGraphics.h>
+#import <SDWebImage/SDGraphicsImageRenderer.h>
 #import <SDWebImage/UIImage+GIF.h>
 #import <SDWebImage/UIImage+ForceDecode.h>
 #import <SDWebImage/NSData+ImageContentType.h>
+#import <SDWebImage/SDWebImageDefine.h>
+#import <SDWebImage/SDWebImageError.h>
+#import <SDWebImage/SDWebImageOptionsProcessor.h>
+#import <SDWebImage/SDImageIOAnimatedCoder.h>
+#import <SDWebImage/SDImageHEICCoder.h>
+#import <SDWebImage/SDImageAWebPCoder.h>
 
-#if SD_MAC
-    #import <SDWebImage/NSImage+WebCache.h>
-    #import <SDWebImage/NSButton+WebCache.h>
-    #import <SDWebImage/SDAnimatedImageRep.h>
+// Mac
+#if __has_include(<SDWebImage/NSImage+Compatibility.h>)
+#import <SDWebImage/NSImage+Compatibility.h>
+#endif
+#if __has_include(<SDWebImage/NSButton+WebCache.h>)
+#import <SDWebImage/NSButton+WebCache.h>
+#endif
+#if __has_include(<SDWebImage/SDAnimatedImageRep.h>)
+#import <SDWebImage/SDAnimatedImageRep.h>
 #endif
 
-#if SD_UIKIT
-    #import <SDWebImage/FLAnimatedImageView+WebCache.h>
-
-    #if __has_include(<SDWebImage/FLAnimatedImage.h>)
-        #import <SDWebImage/FLAnimatedImage.h>
-    #endif
-
-    #if __has_include(<SDWebImage/FLAnimatedImageView.h>)
-        #import <SDWebImage/FLAnimatedImageView.h>
-    #endif
-
+// MapKit
+#if __has_include(<SDWebImage/MKAnnotationView+WebCache.h>)
+#import <SDWebImage/MKAnnotationView+WebCache.h>
 #endif
diff --git a/WebImage/SDWebImageMapKit.h b/WebImage/SDWebImageMapKit.h
new file mode 100644
index 000000000..84e43156f
--- /dev/null
+++ b/WebImage/SDWebImageMapKit.h
@@ -0,0 +1,21 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ * (c) Florent Vilmart
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <MapKit/MapKit.h>
+
+//! Project version number for SDWebImageMapKit.
+FOUNDATION_EXPORT double SDWebImageMapKitVersionNumber;
+
+//! Project version string for SDWebImageMapKit.
+FOUNDATION_EXPORT const unsigned char SDWebImageMapKitVersionString[];
+
+// In this header, you should import all the public headers of your framework using statements like #import <SDWebImageMapKit/PublicHeader.h>
+
+// MapKit
+#import <SDWebImageMapKit/MKAnnotationView+WebCache.h>
diff --git a/codecov.yml b/codecov.yml
new file mode 100644
index 000000000..be6150f9e
--- /dev/null
+++ b/codecov.yml
@@ -0,0 +1,17 @@
+coverage:
+  ignore:
+    - "Examples"
+    - "Vendors"
+    - "Tests"
+  status:
+    project:
+      default: off
+      ios:
+        flags:
+          - ios
+      macos:
+        flags:
+          - macos
+      tvos:
+        flags:
+          - tvos