Mike Klein | c9eace8 | 2018-10-31 10:49:38 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2018 Google Inc. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license that can be |
| 5 | * found in the LICENSE file. |
| 6 | */ |
| 7 | |
| 8 | #include "gm.h" |
| 9 | #include "SkColor.h" |
| 10 | |
| 11 | DEF_SIMPLE_GM(unpremul, canvas, 200, 200) { |
| 12 | const SkColor color = 0xbf400000; |
| 13 | |
| 14 | auto grade = [&](int x, int y){ |
| 15 | SkBitmap bm; |
| 16 | bm.allocPixels(SkImageInfo::Make(1,1, |
| 17 | kBGRA_8888_SkColorType, |
| 18 | kUnpremul_SkAlphaType, |
| 19 | SkColorSpace::MakeSRGB())); |
| 20 | if (!canvas->readPixels(bm, x,y)) { |
| 21 | // Picture-backed canvases, that sort of thing. Just assume they're good. |
| 22 | MarkGMGood(canvas, 140,40); |
| 23 | return; |
| 24 | } |
| 25 | |
| 26 | SkColor pixel; |
| 27 | memcpy(&pixel, bm.getAddr(0,0), sizeof(pixel)); |
| 28 | |
| 29 | auto close = [](int x, int y) { |
| 30 | return x-y < 2 |
| 31 | && y-x < 2; |
| 32 | }; |
| 33 | |
| 34 | if (close(SkColorGetR(pixel), SkColorGetR(color)) && |
| 35 | close(SkColorGetG(pixel), SkColorGetG(color)) && |
| 36 | close(SkColorGetB(pixel), SkColorGetB(color)) && |
| 37 | close(SkColorGetA(pixel), SkColorGetA(color))) { |
| 38 | |
| 39 | MarkGMGood(canvas, 140,40); |
| 40 | } else { |
| 41 | MarkGMBad(canvas, 140,40); |
| 42 | } |
| 43 | }; |
| 44 | |
| 45 | { |
| 46 | SkPaint paint; |
| 47 | paint.setBlendMode(SkBlendMode::kSrc); |
| 48 | paint.setColor(color); |
| 49 | |
| 50 | canvas->drawRect({0,0,100,100}, paint); |
| 51 | grade(50,50); |
| 52 | } |
| 53 | |
| 54 | canvas->translate(0,100); |
| 55 | |
| 56 | { |
| 57 | SkPaint paint; |
| 58 | paint.setBlendMode(SkBlendMode::kSrc); |
| 59 | |
| 60 | SkBitmap bm; |
| 61 | bm.allocPixels(SkImageInfo::Make(100,100, kRGBA_8888_SkColorType, kUnpremul_SkAlphaType)); |
| 62 | bm.eraseColor(color); |
| 63 | |
| 64 | canvas->drawBitmap(bm, 0,0, &paint); |
| 65 | grade(50,150); |
| 66 | } |
| 67 | |
| 68 | } |