Matt Sarett | 35b8b26 | 2017-03-08 11:31:06 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2017 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 "SkColorSpaceXform.h" |
| 10 | #include "SkColorSpaceXformPriv.h" |
| 11 | #include "SkOpts.h" |
| 12 | #include "SkUtils.h" |
| 13 | |
| 14 | static void clamp_to_alpha(uint32_t* pixels, int count) { |
| 15 | for (int i = 0; i < count; i++) { |
| 16 | uint8_t a = SkGetPackedA32(pixels[i]); |
| 17 | uint8_t r = SkGetPackedR32(pixels[i]); |
| 18 | uint8_t g = SkGetPackedG32(pixels[i]); |
| 19 | uint8_t b = SkGetPackedB32(pixels[i]); |
| 20 | pixels[i] = SkPackARGB32(a, |
| 21 | SkTMin(a, r), |
| 22 | SkTMin(a, g), |
| 23 | SkTMin(a, b)); |
| 24 | } |
| 25 | } |
| 26 | |
| 27 | class GammaEncodedPremulGM : public skiagm::GM { |
| 28 | public: |
| 29 | GammaEncodedPremulGM(sk_sp<SkColorSpace> dst, sk_sp<SkColorSpace> src, const char* desc) |
| 30 | : fDstSpace(dst) |
| 31 | , fSrcSpace(src) |
| 32 | , fXform(SkColorSpaceXform::New(src.get(), dst.get())) |
| 33 | , fName(SkStringPrintf("gamma_encoded_premul_dst-v-src_%s", desc)) |
| 34 | { |
| 35 | int i = 0; |
| 36 | for (int r = 0; r < kColorSteps; r++) { |
| 37 | for (int g = 0; g < kColorSteps; g++) { |
| 38 | for (int b = 0; b < kColorSteps; b++) { |
| 39 | fColors[i++] = SkColorSetARGBInline(0xFF, |
| 40 | r * kColorScale, |
| 41 | g * kColorScale, |
| 42 | b * kColorScale); |
| 43 | } |
| 44 | } |
| 45 | } |
| 46 | |
| 47 | } |
| 48 | |
| 49 | protected: |
| 50 | virtual SkISize onISize() override { |
| 51 | return SkISize::Make(kAlphaMax, kNumColors * 2 * kStripeHeight); |
| 52 | } |
| 53 | |
| 54 | SkString onShortName() override { |
| 55 | return fName; |
| 56 | } |
| 57 | |
| 58 | void onDraw(SkCanvas* canvas) override { |
| 59 | if (canvas->imageInfo().isOpaque()) { |
| 60 | return; |
| 61 | } |
| 62 | |
| 63 | SkBitmap bitmap; |
| 64 | SkImageInfo bitmapInfo = SkImageInfo::MakeN32Premul(kAlphaMax, 1, |
| 65 | canvas->imageInfo().refColorSpace()); |
| 66 | bitmap.allocPixels(bitmapInfo); |
| 67 | uint32_t* pixels = bitmap.getAddr32(0, 0); |
| 68 | |
| 69 | for (int i = 0; i < kNumColors; i++) { |
| 70 | // Create an entire row of the same color, with the alpha from 0 to kAlphaMax. |
| 71 | uint32_t row[kAlphaMax]; |
| 72 | sk_memset32(row, fColors[i], kAlphaMax); |
| 73 | for (int a = 0; a < kAlphaMax; a++) { |
| 74 | row[a] = (row[a] & 0x00FFFFFF) | (a << 24); |
| 75 | } |
| 76 | |
| 77 | // Tranform row to dst, then premultiply. |
| 78 | fXform->apply(select_xform_format(kN32_SkColorType), pixels, |
| 79 | SkColorSpaceXform::kBGRA_8888_ColorFormat, row, kAlphaMax, |
| 80 | kUnpremul_SkAlphaType); |
| 81 | SkOpts::RGBA_to_rgbA(pixels, pixels, kAlphaMax); |
| 82 | |
| 83 | // Write the dst space premultiplied row to the canvas. |
| 84 | for (int j = 0; j < kStripeHeight; j++) { |
| 85 | canvas->drawBitmap(bitmap, 0, 2 * i * kStripeHeight + j); |
| 86 | } |
| 87 | |
| 88 | // Premultiply, then transform the row to dst. |
| 89 | SkOpts::RGBA_to_rgbA(pixels, row, kAlphaMax); |
| 90 | fXform->apply(select_xform_format(kN32_SkColorType), pixels, |
| 91 | SkColorSpaceXform::kBGRA_8888_ColorFormat, pixels, kAlphaMax, |
| 92 | kUnpremul_SkAlphaType); |
| 93 | clamp_to_alpha(pixels, kAlphaMax); |
| 94 | |
| 95 | // Write the src space premultiplied row to the canvas. |
| 96 | for (int j = 0; j < kStripeHeight; j++) { |
| 97 | canvas->drawBitmap(bitmap, 0, (2 * i + 1) * kStripeHeight + j); |
| 98 | } |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | private: |
| 103 | static constexpr int kColorSteps = 4; |
| 104 | static constexpr int kNumColors = kColorSteps * kColorSteps * kColorSteps; |
| 105 | static constexpr int kColorScale = 255 / (kColorSteps - 1); |
| 106 | static constexpr int kStripeHeight = 10; |
| 107 | static constexpr int kAlphaMax = 255; |
| 108 | |
| 109 | sk_sp<SkColorSpace> fDstSpace; |
| 110 | sk_sp<SkColorSpace> fSrcSpace; |
| 111 | std::unique_ptr<SkColorSpaceXform> fXform; |
| 112 | SkString fName; |
| 113 | SkColor fColors[kNumColors]; |
| 114 | |
| 115 | typedef GM INHERITED; |
| 116 | }; |
| 117 | |
| 118 | DEF_GM(return new GammaEncodedPremulGM(SkColorSpace::MakeSRGB(), |
| 119 | SkColorSpace::MakeRGB(SkColorSpace::kSRGB_RenderTargetGamma, SkColorSpace::kRec2020_Gamut), |
| 120 | "toWideGamut");) |
| 121 | DEF_GM(return new GammaEncodedPremulGM(SkColorSpace::MakeRGB(SkColorSpace::kSRGB_RenderTargetGamma, |
| 122 | SkColorSpace::kRec2020_Gamut), SkColorSpace::MakeSRGB(), "fromWideGamut");) |
| 123 | DEF_GM(return new GammaEncodedPremulGM(SkColorSpace::MakeSRGB(), |
| 124 | SkColorSpace::MakeRGB(SkColorSpace::kLinear_RenderTargetGamma, SkColorSpace::kSRGB_Gamut), |
| 125 | "toLinear");) |
| 126 | DEF_GM(return new GammaEncodedPremulGM( |
| 127 | SkColorSpace::MakeRGB(SkColorSpace::kLinear_RenderTargetGamma, SkColorSpace::kSRGB_Gamut), |
| 128 | SkColorSpace::MakeSRGB(), "fromLinear");) |
| 129 | DEF_GM(return new GammaEncodedPremulGM( |
| 130 | SkColorSpace::MakeRGB({ 1.8f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f }, |
| 131 | SkColorSpace::kSRGB_Gamut), SkColorSpace::MakeSRGB(), "from1.8");) |