55 lines
1.7 KiB
C++
55 lines
1.7 KiB
C++
/*
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* Copyright 2020 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/gm.h"
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#include "include/core/SkBitmap.h"
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#include "include/core/SkCanvas.h"
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#include "include/core/SkImage.h"
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// This GM should draw two yellow boxes; the bug drew one in cyan.
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DEF_SIMPLE_GM(skbug_9819, c, 256, 256) {
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auto info = SkImageInfo::Make(1,1, kUnknown_SkColorType, kPremul_SkAlphaType);
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SkBitmap rgba,
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bgra;
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rgba.allocPixels(info.makeColorType(kRGBA_8888_SkColorType));
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bgra.allocPixels(info.makeColorType(kBGRA_8888_SkColorType));
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SkColor yellow = 0xffffff00;
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rgba.eraseColor(yellow);
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bgra.eraseColor(yellow);
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c->save();
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c->scale(128,128);
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c->drawImage(rgba.asImage(), 0,0);
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c->drawImage(bgra.asImage(), 0,1);
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c->restore();
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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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kGray_8_SkColorType,
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kUnpremul_SkAlphaType,
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SkColorSpace::MakeSRGB()));
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if (!c->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(c, x+128, y);
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return;
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}
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// We test only luma so that grayscale destinations are also correctly graded:
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// - yellow (good) is around 237
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// - cyan (bad) is around 202
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uint8_t gray = *bm.getAddr8(0,0);
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(abs(gray - 237) > 2 ? MarkGMBad
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: MarkGMGood)(c, x+128,y);
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};
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grade(64, 64);
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grade(64, 192);
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}
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