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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrYUVEffect_DEFINED
#define GrYUVEffect_DEFINED
#include "SkImageInfo.h"
class GrFragmentProcessor;
class GrTexture;
namespace GrYUVEffect {
/**
* Creates an effect that performs color conversion from YUV to RGB. The input textures are
* assumed to be kA8_GrPixelConfig.
*/
const GrFragmentProcessor* CreateYUVToRGB(GrTexture* yTexture, GrTexture* uTexture,
GrTexture* vTexture, const SkISize sizes[3],
SkYUVColorSpace colorSpace);
/**
* Creates a processor that performs color conversion from the passed in processor's RGB
* channels to Y, U ,and V channels. The output color is (y, u, v, a) where a is the passed in
* processor's alpha output.
*/
const GrFragmentProcessor* CreateRGBToYUV(const GrFragmentProcessor*,
SkYUVColorSpace colorSpace);
/**
* Creates a processor that performs color conversion from the passed in processor's RGB
* channels to U and V channels. The output color is (u, v, 0, a) where a is the passed in
* processor's alpha output.
*/
const GrFragmentProcessor* CreateRGBToUV(const GrFragmentProcessor*,
SkYUVColorSpace colorSpace);
/**
* Creates a processor that performs color conversion from the passed in fragment processors's
* RGB channels to Y, U, or V (replicated across all four output color channels). The alpha
* output of the passed in fragment processor is ignored.
*/
const GrFragmentProcessor* CreateRGBToY(const GrFragmentProcessor*, SkYUVColorSpace colorSpace);
const GrFragmentProcessor* CreateRGBToU(const GrFragmentProcessor*, SkYUVColorSpace colorSpace);
const GrFragmentProcessor* CreateRGBToV(const GrFragmentProcessor*, SkYUVColorSpace colorSpace);
};
#endif
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