| /* |
| * Copyright 2017 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkColorSpacePriv.h" |
| #include "SkImage.h" |
| #include "SkPngEncoder.h" |
| |
| #include "Resources.h" |
| |
| /** |
| * Create a color space that swaps the red, green, and blue channels. |
| */ |
| static sk_sp<SkColorSpace> gbr_color_space() { |
| return as_CSB(SkColorSpace::MakeSRGB())->makeColorSpin(); |
| } |
| |
| /** |
| * Create a color space with a steep transfer function. |
| */ |
| static sk_sp<SkColorSpace> tf_color_space() { |
| SkColorSpaceTransferFn fn; |
| fn.fA = 1.f; fn.fB = 0.f; fn.fC = 0.f; fn.fD = 0.f; fn.fE = 0.f; fn.fF = 0.f; fn.fG = 50.f; |
| return SkColorSpace::MakeRGB(fn, SkColorSpace::kSRGB_Gamut); |
| } |
| |
| /** |
| * Create a wide gamut color space. |
| */ |
| static sk_sp<SkColorSpace> wide_gamut_color_space() { |
| return SkColorSpace::MakeRGB(SkColorSpace::kSRGB_RenderTargetGamma, |
| SkColorSpace::kRec2020_Gamut); |
| } |
| |
| int main(int argc, char** argv) { |
| sk_sp<SkImage> image = GetResourceAsImage("images/flutter_logo.jpg"); |
| if (!image) { |
| SkDebugf("Cannot find flutter_logo.jpg in resources.\n"); |
| return 1; |
| } |
| |
| // Encode an image with a gbr color space. |
| SkImageInfo info = SkImageInfo::MakeN32(image->width(), image->height(), kOpaque_SkAlphaType, |
| gbr_color_space()); |
| size_t rowBytes = info.minRowBytes(); |
| SkAutoTMalloc<uint8_t> storage(rowBytes * image->height()); |
| SkPixmap src(info, storage.get(), rowBytes); |
| image->readPixels(src, 0, 0, SkImage::kDisallow_CachingHint); |
| SkFILEWStream dst0("gbr.png"); |
| SkPngEncoder::Options opts; |
| opts.fUnpremulBehavior = SkTransferFunctionBehavior::kIgnore; // Does not matter for opaque src |
| SkAssertResult(SkPngEncoder::Encode(&dst0, src, opts)); |
| |
| // Encode an image with steep transfer function. |
| src.setColorSpace(tf_color_space()); |
| image->readPixels(src, 0, 0, SkImage::kDisallow_CachingHint); |
| SkFILEWStream dst1("tf.png"); |
| SkAssertResult(SkPngEncoder::Encode(&dst1, src, opts)); |
| |
| // Encode a wide gamut image. |
| src.setColorSpace(wide_gamut_color_space()); |
| image->readPixels(src, 0, 0, SkImage::kDisallow_CachingHint); |
| SkFILEWStream dst2("wide-gamut.png"); |
| SkAssertResult(SkPngEncoder::Encode(&dst2, src, opts)); |
| |
| return 0; |
| } |