9f1c403362
Bug: skia: Change-Id: Ia4f892368fceda4a99490f5bd29851837a7a6927 Reviewed-on: https://skia-review.googlesource.com/17212 Reviewed-by: Brian Osman <brianosman@google.com> Commit-Queue: Matt Sarett <msarett@google.com>
83 lines
2.7 KiB
C++
83 lines
2.7 KiB
C++
/*
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* Copyright 2017 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SkColorSpacePriv.h"
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#include "SkImage.h"
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#include "SkPngEncoder.h"
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#include "Resources.h"
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/**
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* Create a color space that swaps the red, green, and blue channels.
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*/
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static sk_sp<SkColorSpace> gbr_color_space() {
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float gbr[9];
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gbr[0] = gSRGB_toXYZD50[1];
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gbr[1] = gSRGB_toXYZD50[2];
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gbr[2] = gSRGB_toXYZD50[0];
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gbr[3] = gSRGB_toXYZD50[4];
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gbr[4] = gSRGB_toXYZD50[5];
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gbr[5] = gSRGB_toXYZD50[3];
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gbr[6] = gSRGB_toXYZD50[7];
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gbr[7] = gSRGB_toXYZD50[8];
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gbr[8] = gSRGB_toXYZD50[6];
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SkMatrix44 toXYZD50(SkMatrix44::kUninitialized_Constructor);
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toXYZD50.set3x3RowMajorf(gbr);
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return SkColorSpace::MakeRGB(SkColorSpace::kSRGB_RenderTargetGamma, toXYZD50);
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}
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/**
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* Create a color space with a steep transfer function.
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*/
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static sk_sp<SkColorSpace> tf_color_space() {
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SkColorSpaceTransferFn fn;
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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;
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return SkColorSpace::MakeRGB(fn, SkColorSpace::kSRGB_Gamut);
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}
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/**
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* Create a wide gamut color space.
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*/
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static sk_sp<SkColorSpace> wide_gamut_color_space() {
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return SkColorSpace::MakeRGB(SkColorSpace::kSRGB_RenderTargetGamma,
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SkColorSpace::kRec2020_Gamut);
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}
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int main(int argc, char** argv) {
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sk_sp<SkImage> image = GetResourceAsImage("flutter_logo.jpg");
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if (!image) {
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SkDebugf("Cannot find flutter_logo.jpg in resources.\n");
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return 1;
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}
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// Encode an image with a gbr color space.
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SkImageInfo info = SkImageInfo::MakeN32(image->width(), image->height(), kOpaque_SkAlphaType,
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gbr_color_space());
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size_t rowBytes = info.minRowBytes();
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SkAutoTMalloc<uint8_t> storage(rowBytes * image->height());
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SkPixmap src(info, storage.get(), rowBytes);
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image->readPixels(src, 0, 0, SkImage::kDisallow_CachingHint);
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SkFILEWStream dst0("gbr.png");
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SkPngEncoder::Options opts;
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opts.fUnpremulBehavior = SkTransferFunctionBehavior::kIgnore; // Does not matter for opaque src
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SkAssertResult(SkPngEncoder::Encode(&dst0, src, opts));
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// Encode an image with steep transfer function.
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src.setColorSpace(tf_color_space());
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image->readPixels(src, 0, 0, SkImage::kDisallow_CachingHint);
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SkFILEWStream dst1("tf.png");
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SkAssertResult(SkPngEncoder::Encode(&dst1, src, opts));
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// Encode a wide gamut image.
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src.setColorSpace(wide_gamut_color_space());
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image->readPixels(src, 0, 0, SkImage::kDisallow_CachingHint);
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SkFILEWStream dst2("wide-gamut.png");
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SkAssertResult(SkPngEncoder::Encode(&dst2, src, opts));
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return 0;
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}
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