diff options
Diffstat (limited to 'chromium/third_party/skia/gm/drawimageset.cpp')
| -rw-r--r-- | chromium/third_party/skia/gm/drawimageset.cpp | 65 |
1 files changed, 63 insertions, 2 deletions
diff --git a/chromium/third_party/skia/gm/drawimageset.cpp b/chromium/third_party/skia/gm/drawimageset.cpp index 345b5a9238b..870da11ec9f 100644 --- a/chromium/third_party/skia/gm/drawimageset.cpp +++ b/chromium/third_party/skia/gm/drawimageset.cpp @@ -34,12 +34,12 @@ // Makes a set of m x n tiled images to be drawn with SkCanvas::experimental_drawImageSetV1(). static void make_image_tiles(int tileW, int tileH, int m, int n, const SkColor colors[4], - SkCanvas::ImageSetEntry set[]) { + SkCanvas::ImageSetEntry set[], const SkColor bgColor=SK_ColorLTGRAY) { const int w = tileW * m; const int h = tileH * n; auto surf = SkSurface::MakeRaster( SkImageInfo::Make(w, h, kRGBA_8888_SkColorType, kPremul_SkAlphaType)); - surf->getCanvas()->clear(SK_ColorLTGRAY); + surf->getCanvas()->clear(bgColor); static constexpr SkScalar kStripeW = 10; static constexpr SkScalar kStripeSpacing = 30; @@ -288,7 +288,68 @@ private: SkCanvas::ImageSetEntry fSet[kM * kN]; }; +// This GM exercises alpha-only and color textures being combined correctly with the paint's color. +class DrawImageSetAlphaOnlyGM : public GM { +private: + SkString onShortName() override { return SkString("draw_image_set_alpha_only"); } + SkISize onISize() override { return {kM*kTileW, 2*kN*kTileH}; } + void onOnceBeforeDraw() override { + static constexpr SkColor kColors[] = {SK_ColorBLUE, SK_ColorTRANSPARENT, + SK_ColorRED, SK_ColorTRANSPARENT}; + static constexpr SkColor kBGColor = SkColorSetARGB(128, 128, 128, 128); + make_image_tiles(kTileW, kTileH, kM, kN, kColors, fSet, kBGColor); + + // Modify the alpha of the entries, decreasing by column, and convert even rows to + // alpha-only textures. + sk_sp<SkColorSpace> alphaSpace = SkColorSpace::MakeSRGB(); + for (int y = 0; y < kN; ++y) { + for (int x = 0; x < kM; ++x) { + int i = y * kM + x; + fSet[i].fAlpha = (kM - x) / (float) kM; + if (y % 2 == 0) { + fSet[i].fImage = fSet[i].fImage->makeColorTypeAndColorSpace( + kAlpha_8_SkColorType, alphaSpace); + } + } + } + + } + + void onDraw(SkCanvas* canvas) override { + ToolUtils::draw_checkerboard(canvas, SK_ColorGRAY, SK_ColorDKGRAY, 25); + + SkPaint paint; + paint.setFilterQuality(kLow_SkFilterQuality); + paint.setBlendMode(SkBlendMode::kSrcOver); + paint.setColor4f({0.2f, 0.8f, 0.4f, 1.f}); // colorizes even rows, no effect on odd rows + + // Top rows use experimental edge set API + canvas->experimental_DrawEdgeAAImageSet(fSet, kM * kN, nullptr, nullptr, &paint, + SkCanvas::kFast_SrcRectConstraint); + + canvas->translate(0.f, kN * kTileH); + + // Bottom rows draw each image from the set using the regular API + for (int y = 0; y < kN; ++y) { + for (int x = 0; x < kM; ++x) { + int i = y * kM + x; + SkPaint entryPaint = paint; + entryPaint.setAlphaf(fSet[i].fAlpha * paint.getAlphaf()); + canvas->drawImageRect(fSet[i].fImage.get(), fSet[i].fSrcRect, fSet[i].fDstRect, + &entryPaint, SkCanvas::kFast_SrcRectConstraint); + } + } + } + + static constexpr int kM = 4; + static constexpr int kN = 4; + static constexpr int kTileW = 50; + static constexpr int kTileH = 50; + SkCanvas::ImageSetEntry fSet[kM * kN]; +}; + DEF_GM(return new DrawImageSetGM();) DEF_GM(return new DrawImageSetRectToRectGM();) +DEF_GM(return new DrawImageSetAlphaOnlyGM();) } // namespace skiagm |