| /* |
| * Copyright 2020 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "gm/gm.h" |
| #include "include/core/SkBitmap.h" |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkColorSpace.h" |
| #include "include/core/SkImage.h" |
| |
| // This GM should draw two yellow boxes; the bug drew one in cyan. |
| |
| DEF_SIMPLE_GM(skbug_9819, c, 256, 256) { |
| auto info = SkImageInfo::Make(1,1, kUnknown_SkColorType, kPremul_SkAlphaType); |
| SkBitmap rgba, |
| bgra; |
| rgba.allocPixels(info.makeColorType(kRGBA_8888_SkColorType)); |
| bgra.allocPixels(info.makeColorType(kBGRA_8888_SkColorType)); |
| |
| SkColor yellow = 0xffffff00; |
| rgba.eraseColor(yellow); |
| bgra.eraseColor(yellow); |
| |
| c->save(); |
| c->scale(128,128); |
| c->drawImage(rgba.asImage(), 0,0); |
| c->drawImage(bgra.asImage(), 0,1); |
| c->restore(); |
| |
| auto grade = [&](int x, int y){ |
| SkBitmap bm; |
| bm.allocPixels(SkImageInfo::Make(1,1, |
| kGray_8_SkColorType, |
| kUnpremul_SkAlphaType, |
| SkColorSpace::MakeSRGB())); |
| if (!c->readPixels(bm, x,y)) { |
| // Picture-backed canvases, that sort of thing. Just assume they're good. |
| MarkGMGood(c, x+128, y); |
| return; |
| } |
| |
| // We test only luma so that grayscale destinations are also correctly graded: |
| // - yellow (good) is around 237 |
| // - cyan (bad) is around 202 |
| uint8_t gray = *bm.getAddr8(0,0); |
| (abs(gray - 237) > 2 ? MarkGMBad |
| : MarkGMGood)(c, x+128,y); |
| }; |
| |
| grade(64, 64); |
| grade(64, 192); |
| } |