| 1 | // Copyright 2013 The Flutter Authors. All rights reserved. |
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| 2 | // Use of this source code is governed by a BSD-style license that can be |
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| 3 | // found in the LICENSE file. |
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| 4 | |
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| 5 | #include "flutter/flow/paint_utils.h" |
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| 6 | |
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| 7 | #include <stdlib.h> |
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| 8 | |
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| 9 | #include "third_party/skia/include/core/SkBitmap.h" |
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| 10 | #include "third_party/skia/include/core/SkImage.h" |
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| 11 | |
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| 12 | namespace flutter { |
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| 13 | |
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| 14 | namespace { |
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| 15 | |
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| 16 | std::shared_ptr<DlColorSource> CreateCheckerboardShader(SkColor c1, |
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| 17 | SkColor c2, |
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| 18 | int size) { |
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| 19 | SkBitmap bm; |
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| 20 | bm.allocN32Pixels(width: 2 * size, height: 2 * size); |
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| 21 | bm.eraseColor(c: c1); |
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| 22 | bm.eraseArea(area: SkIRect::MakeLTRB(l: 0, t: 0, r: size, b: size), c: c2); |
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| 23 | bm.eraseArea(area: SkIRect::MakeLTRB(l: size, t: size, r: 2 * size, b: 2 * size), c: c2); |
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| 24 | auto image = DlImage::Make(image: SkImages::RasterFromBitmap(bitmap: bm)); |
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| 25 | return std::make_shared<DlImageColorSource>( |
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| 26 | args&: image, args: DlTileMode::kRepeat, args: DlTileMode::kRepeat, |
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| 27 | args: DlImageSampling::kNearestNeighbor); |
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| 28 | } |
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| 29 | |
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| 30 | } // anonymous namespace |
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| 31 | |
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| 32 | void DrawCheckerboard(DlCanvas* canvas, const SkRect& rect) { |
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| 33 | // Draw a checkerboard |
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| 34 | canvas->Save(); |
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| 35 | canvas->ClipRect(rect, clip_op: DlCanvas::ClipOp::kIntersect, is_aa: false); |
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| 36 | |
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| 37 | // Secure random number generation isn't needed here. |
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| 38 | // NOLINTBEGIN(clang-analyzer-security.insecureAPI.rand) |
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| 39 | auto checkerboard_color = |
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| 40 | SkColorSetARGB(a: 64, r: rand() % 256, g: rand() % 256, b: rand() % 256); |
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| 41 | // NOLINTEND(clang-analyzer-security.insecureAPI.rand) |
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| 42 | |
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| 43 | DlPaint paint; |
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| 44 | paint.setColorSource( |
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| 45 | CreateCheckerboardShader(c1: checkerboard_color, c2: 0x00000000, size: 12)); |
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| 46 | canvas->DrawPaint(paint); |
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| 47 | canvas->Restore(); |
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| 48 | |
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| 49 | // Stroke the drawn area |
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| 50 | DlPaint debug_paint; |
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| 51 | debug_paint.setStrokeWidth(8); |
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| 52 | debug_paint.setColor(SkColorSetA(c: checkerboard_color, a: 255)); |
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| 53 | debug_paint.setDrawStyle(DlDrawStyle::kStroke); |
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| 54 | canvas->DrawRect(rect, paint: debug_paint); |
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| 55 | } |
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| 56 | |
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| 57 | } // namespace flutter |
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| 58 | |
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