69 lines
1.8 KiB
C++
69 lines
1.8 KiB
C++
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/*
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* Copyright 2018 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "gm.h"
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#include "SkColor.h"
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DEF_SIMPLE_GM(unpremul, canvas, 200, 200) {
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const SkColor color = 0xbf400000;
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auto grade = [&](int x, int y){
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SkBitmap bm;
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bm.allocPixels(SkImageInfo::Make(1,1,
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kBGRA_8888_SkColorType,
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kUnpremul_SkAlphaType,
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SkColorSpace::MakeSRGB()));
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if (!canvas->readPixels(bm, x,y)) {
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// Picture-backed canvases, that sort of thing. Just assume they're good.
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MarkGMGood(canvas, 140,40);
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return;
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}
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SkColor pixel;
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memcpy(&pixel, bm.getAddr(0,0), sizeof(pixel));
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auto close = [](int x, int y) {
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return x-y < 2
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&& y-x < 2;
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};
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if (close(SkColorGetR(pixel), SkColorGetR(color)) &&
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close(SkColorGetG(pixel), SkColorGetG(color)) &&
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close(SkColorGetB(pixel), SkColorGetB(color)) &&
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close(SkColorGetA(pixel), SkColorGetA(color))) {
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MarkGMGood(canvas, 140,40);
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} else {
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MarkGMBad(canvas, 140,40);
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}
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};
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{
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SkPaint paint;
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paint.setBlendMode(SkBlendMode::kSrc);
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paint.setColor(color);
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canvas->drawRect({0,0,100,100}, paint);
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grade(50,50);
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}
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canvas->translate(0,100);
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{
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SkPaint paint;
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paint.setBlendMode(SkBlendMode::kSrc);
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SkBitmap bm;
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bm.allocPixels(SkImageInfo::Make(100,100, kRGBA_8888_SkColorType, kUnpremul_SkAlphaType));
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bm.eraseColor(color);
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canvas->drawBitmap(bm, 0,0, &paint);
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grade(50,150);
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}
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}
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