bsalomon@google.com | a91e923 | 2012-02-23 15:39:54 +0000 | [diff] [blame] | 1 | |
| 2 | /* |
| 3 | * Copyright 2011 Google Inc. |
| 4 | * |
| 5 | * Use of this source code is governed by a BSD-style license that can be |
| 6 | * found in the LICENSE file. |
| 7 | */ |
| 8 | |
| 9 | #include "Test.h" |
| 10 | #include "SkCanvas.h" |
| 11 | #include "SkConfig8888.h" |
| 12 | #include "SkGpuDevice.h" |
| 13 | |
| 14 | |
| 15 | namespace { |
| 16 | |
| 17 | void fillCanvas(SkCanvas* canvas, SkCanvas::Config8888 unpremulConfig) { |
| 18 | SkBitmap bmp; |
| 19 | bmp.setConfig(SkBitmap::kARGB_8888_Config, 256, 256); |
| 20 | bmp.allocPixels(); |
| 21 | SkAutoLockPixels alp(bmp); |
| 22 | uint32_t* pixels = reinterpret_cast<uint32_t*>(bmp.getPixels()); |
| 23 | |
| 24 | for (int a = 0; a < 256; ++a) { |
| 25 | for (int r = 0; r < 256; ++r) { |
| 26 | pixels[a * 256 + r] = SkPackConfig8888(unpremulConfig, a, r, 0, 0); |
| 27 | } |
| 28 | } |
| 29 | canvas->writePixels(bmp, 0, 0, unpremulConfig); |
| 30 | } |
| 31 | |
| 32 | static const SkCanvas::Config8888 gUnpremulConfigs[] = { |
| 33 | SkCanvas::kNative_Unpremul_Config8888, |
| 34 | /** |
| 35 | * There is a bug in Ganesh (http://code.google.com/p/skia/issues/detail?id=438) |
| 36 | * that causes the readback of pixels from BGRA canvas to an RGBA bitmap to |
| 37 | * fail. This should be removed as soon as the issue above is resolved. |
| 38 | */ |
| 39 | #if !defined(SK_BUILD_FOR_ANDROID) |
| 40 | SkCanvas::kBGRA_Unpremul_Config8888, |
| 41 | #endif |
| 42 | SkCanvas::kRGBA_Unpremul_Config8888, |
| 43 | }; |
| 44 | |
| 45 | void PremulAlphaRoundTripTest(skiatest::Reporter* reporter, |
| 46 | GrContext* context) { |
| 47 | SkCanvas canvas; |
| 48 | for (int dtype = 0; dtype < 2; ++dtype) { |
| 49 | if (0 == dtype) { |
| 50 | canvas.setDevice(new SkDevice(SkBitmap::kARGB_8888_Config, |
| 51 | 256, |
| 52 | 256, |
| 53 | false))->unref(); |
| 54 | } else { |
| 55 | #if SK_SCALAR_IS_FIXED |
| 56 | // GPU device known not to work in the fixed pt build. |
| 57 | continue; |
| 58 | #endif |
| 59 | canvas.setDevice(new SkGpuDevice(context, |
| 60 | SkBitmap::kARGB_8888_Config, |
| 61 | 256, |
| 62 | 256))->unref(); |
| 63 | } |
| 64 | |
| 65 | SkBitmap readBmp1; |
| 66 | readBmp1.setConfig(SkBitmap::kARGB_8888_Config, 256, 256); |
| 67 | readBmp1.allocPixels(); |
| 68 | SkBitmap readBmp2; |
| 69 | readBmp2.setConfig(SkBitmap::kARGB_8888_Config, 256, 256); |
| 70 | readBmp2.allocPixels(); |
| 71 | |
| 72 | for (size_t upmaIdx = 0; |
| 73 | upmaIdx < SK_ARRAY_COUNT(gUnpremulConfigs); |
| 74 | ++upmaIdx) { |
| 75 | fillCanvas(&canvas, gUnpremulConfigs[upmaIdx]); |
| 76 | { |
| 77 | SkAutoLockPixels alp1(readBmp1); |
| 78 | SkAutoLockPixels alp2(readBmp2); |
| 79 | sk_bzero(readBmp1.getPixels(), readBmp1.getSafeSize()); |
| 80 | sk_bzero(readBmp2.getPixels(), readBmp2.getSafeSize()); |
| 81 | } |
| 82 | |
| 83 | canvas.readPixels(&readBmp1, 0, 0, gUnpremulConfigs[upmaIdx]); |
| 84 | canvas.writePixels(readBmp1, 0, 0, gUnpremulConfigs[upmaIdx]); |
| 85 | canvas.readPixels(&readBmp2, 0, 0, gUnpremulConfigs[upmaIdx]); |
| 86 | |
| 87 | SkAutoLockPixels alp1(readBmp1); |
| 88 | SkAutoLockPixels alp2(readBmp2); |
| 89 | uint32_t* pixels1 = |
| 90 | reinterpret_cast<uint32_t*>(readBmp1.getPixels()); |
| 91 | uint32_t* pixels2 = |
| 92 | reinterpret_cast<uint32_t*>(readBmp2.getPixels()); |
| 93 | for (int y = 0; y < 256; ++y) { |
| 94 | for (int x = 0; x < 256; ++x) { |
| 95 | int i = y * 256 + x; |
| 96 | REPORTER_ASSERT(reporter, pixels1[i] == pixels2[i]); |
| 97 | } |
| 98 | } |
| 99 | } |
| 100 | } |
| 101 | } |
| 102 | } |
| 103 | |
| 104 | #include "TestClassDef.h" |
| 105 | DEFINE_GPUTESTCLASS("PremulAlphaRoundTripTest", PremulAlphaRoundTripTestClass, PremulAlphaRoundTripTest) |
| 106 | |