| 1 | /* |
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| 2 | * Copyright 2015 Google Inc. |
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| 3 | * |
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| 4 | * Use of this source code is governed by a BSD-style license that can be |
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| 5 | * found in the LICENSE file. |
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| 6 | */ |
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| 7 | |
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| 8 | #ifndef SkCodec_wbmp_DEFINED |
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| 9 | #define SkCodec_wbmp_DEFINED |
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| 10 | |
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| 11 | #include "include/codec/SkCodec.h" |
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| 12 | #include "include/core/SkTypes.h" |
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| 13 | #include "include/private/base/SkTemplates.h" |
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| 14 | #include "src/codec/SkSwizzler.h" |
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| 15 | |
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| 16 | #include <cstddef> |
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| 17 | #include <cstdint> |
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| 18 | #include <memory> |
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| 19 | |
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| 20 | class SkSampler; |
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| 21 | class SkStream; |
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| 22 | enum class SkEncodedImageFormat; |
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| 23 | struct SkEncodedInfo; |
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| 24 | struct SkImageInfo; |
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| 25 | |
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| 26 | class SkWbmpCodec final : public SkCodec { |
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| 27 | public: |
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| 28 | static bool IsWbmp(const void*, size_t); |
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| 29 | |
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| 30 | /* |
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| 31 | * Assumes IsWbmp was called and returned true |
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| 32 | * Creates a wbmp codec |
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| 33 | * Takes ownership of the stream |
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| 34 | */ |
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| 35 | static std::unique_ptr<SkCodec> MakeFromStream(std::unique_ptr<SkStream>, Result*); |
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| 36 | |
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| 37 | protected: |
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| 38 | SkEncodedImageFormat onGetEncodedFormat() const override; |
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| 39 | Result onGetPixels(const SkImageInfo&, void*, size_t, |
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| 40 | const Options&, int*) override; |
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| 41 | bool onRewind() override; |
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| 42 | bool conversionSupported(const SkImageInfo& dst, bool srcIsOpaque, |
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| 43 | bool needsXform) override; |
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| 44 | // No need to Xform; all pixels are either black or white. |
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| 45 | bool usesColorXform() const override { return false; } |
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| 46 | private: |
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| 47 | SkSampler* getSampler(bool createIfNecessary) override { |
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| 48 | SkASSERT(fSwizzler || !createIfNecessary); |
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| 49 | return fSwizzler.get(); |
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| 50 | } |
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| 51 | |
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| 52 | /* |
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| 53 | * Read a src row from the encoded stream |
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| 54 | */ |
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| 55 | bool readRow(uint8_t* row); |
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| 56 | |
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| 57 | SkWbmpCodec(SkEncodedInfo&&, std::unique_ptr<SkStream>); |
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| 58 | |
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| 59 | const size_t fSrcRowBytes; |
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| 60 | |
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| 61 | // Used for scanline decodes: |
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| 62 | std::unique_ptr<SkSwizzler> fSwizzler; |
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| 63 | skia_private::AutoTMalloc<uint8_t> fSrcBuffer; |
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| 64 | |
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| 65 | int onGetScanlines(void* dst, int count, size_t dstRowBytes) override; |
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| 66 | bool onSkipScanlines(int count) override; |
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| 67 | Result onStartScanlineDecode(const SkImageInfo& dstInfo, |
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| 68 | const Options& options) override; |
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| 69 | |
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| 70 | using INHERITED = SkCodec; |
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| 71 | }; |
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| 72 | |
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| 73 | #endif // SkCodec_wbmp_DEFINED |
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| 74 | |
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