1 /* 2 * Copyright 2014 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 #ifndef GrYUVEffect_DEFINED 9 #define GrYUVEffect_DEFINED 10 11 #include "SkImageInfo.h" 12 13 class GrFragmentProcessor; 14 class GrTexture; 15 16 namespace GrYUVEffect { 17 /** 18 * Creates an effect that performs color conversion from YUV to RGB. The input textures are 19 * assumed to be kA8_GrPixelConfig. 20 */ 21 const GrFragmentProcessor* CreateYUVToRGB(GrTexture* yTexture, GrTexture* uTexture, 22 GrTexture* vTexture, const SkISize sizes[3], 23 SkYUVColorSpace colorSpace); 24 25 /** 26 * Creates a processor that performs color conversion from the passed in processor's RGB 27 * channels to Y, U ,and V channels. The output color is (y, u, v, a) where a is the passed in 28 * processor's alpha output. 29 */ 30 const GrFragmentProcessor* CreateRGBToYUV(const GrFragmentProcessor*, 31 SkYUVColorSpace colorSpace); 32 33 /** 34 * Creates a processor that performs color conversion from the passed in processor's RGB 35 * channels to U and V channels. The output color is (u, v, 0, a) where a is the passed in 36 * processor's alpha output. 37 */ 38 const GrFragmentProcessor* CreateRGBToUV(const GrFragmentProcessor*, 39 SkYUVColorSpace colorSpace); 40 /** 41 * Creates a processor that performs color conversion from the passed in fragment processors's 42 * RGB channels to Y, U, or V (replicated across all four output color channels). The alpha 43 * output of the passed in fragment processor is ignored. 44 */ 45 const GrFragmentProcessor* CreateRGBToY(const GrFragmentProcessor*, SkYUVColorSpace colorSpace); 46 const GrFragmentProcessor* CreateRGBToU(const GrFragmentProcessor*, SkYUVColorSpace colorSpace); 47 const GrFragmentProcessor* CreateRGBToV(const GrFragmentProcessor*, SkYUVColorSpace colorSpace); 48 }; 49 50 #endif 51
