Line data    Source code

       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             : #ifndef GrGLSLColorSpaceXformHelper_DEFINED
       9             : #define GrGLSLColorSpaceXformHelper_DEFINED
      10             : 
      11             : #include "GrColorSpaceXform.h"
      12             : #include "GrGLSLUniformHandler.h"
      13             : 
      14             : /**
      15             :  * Helper class to assist with using GrColorSpaceXform within an FP. This manages all of the
      16             :  * uniforms needed, and can be passed to shader builder functions to automatically generate the
      17             :  * correct color space transformation code.
      18             :  */
      19             : class GrGLSLColorSpaceXformHelper : public SkNoncopyable {
      20             : public:
      21           0 :     GrGLSLColorSpaceXformHelper() : fValid(false) {}
      22             : 
      23           0 :     void emitCode(GrGLSLUniformHandler* uniformHandler, GrColorSpaceXform* colorSpaceXform) {
      24           0 :         SkASSERT(uniformHandler);
      25           0 :         if (colorSpaceXform) {
      26             :             fGamutXformVar = uniformHandler->addUniform(kFragment_GrShaderFlag, kMat44f_GrSLType,
      27           0 :                                                         kDefault_GrSLPrecision, "ColorXform");
      28           0 :             fValid = true;
      29             :         }
      30           0 :     }
      31             : 
      32           0 :     void setData(const GrGLSLProgramDataManager& pdman, GrColorSpaceXform* colorSpaceXform) {
      33           0 :         pdman.setSkMatrix44(fGamutXformVar, colorSpaceXform->srcToDst());
      34           0 :     }
      35             : 
      36           0 :     bool isValid() const { return fValid; }
      37           0 :     GrGLSLProgramDataManager::UniformHandle const gamutXformUniform() { return fGamutXformVar; }
      38             : 
      39             : private:
      40             :     GrGLSLProgramDataManager::UniformHandle fGamutXformVar;
      41             :     bool fValid;
      42             : };
      43             : 
      44             : #endif