Matt Sarett | 84014f0 | 2017-01-10 11:28:54 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2016 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 | |
| 10 | #include "Resources.h" |
| 11 | #include "SkCanvas.h" |
| 12 | #include "SkCodec.h" |
| 13 | #include "SkData.h" |
| 14 | #include "SkImageEncoderPriv.h" |
| 15 | #include "SkPM4f.h" |
| 16 | #include "SkSRGB.h" |
| 17 | |
| 18 | namespace skiagm { |
| 19 | |
| 20 | static const int imageWidth = 128; |
| 21 | static const int imageHeight = 128; |
| 22 | |
| 23 | static inline int div_round_up(int a, int b) { |
| 24 | return (a + b - 1) / b; |
| 25 | } |
| 26 | |
| 27 | static void make_index8(SkBitmap* bitmap, SkAlphaType alphaType, sk_sp<SkColorSpace> colorSpace) { |
| 28 | const SkColor colors[] = { |
| 29 | 0x800000FF, 0x8000FF00, 0x80FF0000, 0x80FFFF00, |
| 30 | }; |
| 31 | |
| 32 | auto toPMColor = [alphaType, colorSpace](SkColor color) { |
| 33 | // In the unpremul case, just convert to SkPMColor ordering. |
| 34 | if (kUnpremul_SkAlphaType == alphaType) { |
| 35 | return SkSwizzle_BGRA_to_PMColor(color); |
| 36 | } |
| 37 | |
| 38 | // Linear premultiply. |
| 39 | if (colorSpace) { |
| 40 | uint32_t result; |
| 41 | Sk4f pmFloat = SkColor4f::FromColor(color).premul().to4f_pmorder(); |
| 42 | SkNx_cast<uint8_t>(sk_linear_to_srgb_needs_trunc(pmFloat)).store(&result); |
| 43 | result = (result & 0x00FFFFFF) | (color & 0xFF000000); |
| 44 | return result; |
| 45 | } |
| 46 | |
| 47 | // Legacy premultiply. |
| 48 | return SkPreMultiplyColor(color); |
| 49 | }; |
| 50 | |
| 51 | // Note that these are not necessarily premultiplied, but they are platform byte ordering. |
| 52 | SkPMColor pmColors[SK_ARRAY_COUNT(colors)]; |
| 53 | for (int i = 0; i < (int) SK_ARRAY_COUNT(colors); i++) { |
| 54 | pmColors[i] = toPMColor(colors[i]); |
| 55 | } |
| 56 | |
| 57 | sk_sp<SkColorTable> colorTable(new SkColorTable(pmColors, SK_ARRAY_COUNT(pmColors))); |
| 58 | SkImageInfo info = SkImageInfo::Make(imageWidth, imageHeight, kIndex_8_SkColorType, |
| 59 | alphaType, colorSpace); |
| 60 | bitmap->allocPixels(info, nullptr, colorTable.get()); |
| 61 | for (int y = 0; y < imageHeight; y++) { |
| 62 | for (int x = 0; x < imageWidth; x++) { |
| 63 | *bitmap->getAddr8(x, y) = (x / div_round_up(imageWidth, 2)) + |
| 64 | (y / div_round_up(imageHeight, 3)); |
| 65 | } |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | static void make(SkBitmap* bitmap, SkColorType colorType, SkAlphaType alphaType, |
| 70 | sk_sp<SkColorSpace> colorSpace) { |
| 71 | if (kIndex_8_SkColorType == colorType) { |
| 72 | make_index8(bitmap, alphaType, colorSpace); |
| 73 | return; |
| 74 | } |
| 75 | |
| 76 | sk_sp<SkData> data = GetResourceAsData("color_wheel.png"); |
| 77 | std::unique_ptr<SkCodec> codec(SkCodec::NewFromData(data)); |
| 78 | SkImageInfo dstInfo = codec->getInfo().makeColorType(colorType) |
| 79 | .makeAlphaType(alphaType) |
| 80 | .makeColorSpace(colorSpace); |
| 81 | bitmap->allocPixels(dstInfo); |
| 82 | codec->getPixels(dstInfo, bitmap->getPixels(), bitmap->rowBytes()); |
| 83 | } |
| 84 | |
| 85 | static sk_sp<SkData> encode_data(const SkBitmap& bitmap) { |
| 86 | SkAutoLockPixels autoLockPixels(bitmap); |
| 87 | SkPixmap src; |
| 88 | if (!bitmap.peekPixels(&src)) { |
| 89 | return nullptr; |
| 90 | } |
| 91 | SkDynamicMemoryWStream buf; |
| 92 | SkEncodeOptions options; |
| 93 | if (bitmap.colorSpace()) { |
| 94 | options.fPremulBehavior = SkEncodeOptions::PremulBehavior::kGammaCorrect; |
| 95 | } |
| 96 | SkAssertResult(SkEncodeImageAsPNG(&buf, src, options)); |
| 97 | return buf.detachAsData(); |
| 98 | } |
| 99 | |
| 100 | class EncodeSRGBGM : public GM { |
| 101 | public: |
| 102 | EncodeSRGBGM() {} |
| 103 | |
| 104 | protected: |
| 105 | SkString onShortName() override { |
| 106 | return SkString("encode-srgb"); |
| 107 | } |
| 108 | |
| 109 | SkISize onISize() override { |
| 110 | return SkISize::Make(imageWidth * 2, imageHeight * 4); |
| 111 | } |
| 112 | |
| 113 | void onDraw(SkCanvas* canvas) override { |
| 114 | const SkColorType colorTypes[] = { kN32_SkColorType, kIndex_8_SkColorType, }; |
| 115 | const SkAlphaType alphaTypes[] = { kUnpremul_SkAlphaType, kPremul_SkAlphaType, }; |
| 116 | const sk_sp<SkColorSpace> colorSpaces[] = { |
| 117 | nullptr, SkColorSpace::MakeNamed(SkColorSpace::kSRGB_Named), |
| 118 | }; |
| 119 | |
| 120 | SkBitmap bitmap; |
| 121 | for (SkColorType colorType : colorTypes) { |
| 122 | for (SkAlphaType alphaType : alphaTypes) { |
| 123 | canvas->save(); |
| 124 | for (sk_sp<SkColorSpace> colorSpace : colorSpaces) { |
| 125 | make(&bitmap, colorType, alphaType, colorSpace); |
| 126 | auto image = SkImage::MakeFromEncoded(encode_data(bitmap)); |
| 127 | canvas->drawImage(image.get(), 0.0f, 0.0f); |
| 128 | canvas->translate((float) imageWidth, 0.0f); |
| 129 | } |
| 130 | canvas->restore(); |
| 131 | canvas->translate(0.0f, (float) imageHeight); |
| 132 | } |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | private: |
| 137 | typedef GM INHERITED; |
| 138 | }; |
| 139 | |
| 140 | DEF_GM( return new EncodeSRGBGM; ) |
| 141 | } |