Implement color filter as GrGLEffect

src/effects/SkMatrixConvolutionImageFilter.cpp

 /*
  * Copyright 2012 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkMatrixConvolutionImageFilter.h"
 #include "SkBitmap.h"
 #include "SkColorPriv.h"
@@ skipping 405 matching lines @@
     builder->fsAppendTextureLookup(sampler, coord);
 }
 
 void GrGLMatrixConvolutionEffect::emitCode(GrGLShaderBuilder* builder,
                                            const GrDrawEffect&,
                                            EffectKey key,
                                            const char* outputColor,
                                            const char* inputColor,
                                            const TransformedCoordsArray& coords,
                                            const TextureSamplerArray& samplers) {
+    sk_ignore_unused_variable(inputColor);
     SkString coords2D = builder->ensureFSCoords2D(coords, 0);
     fBoundsUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
                                      kVec4f_GrSLType, "Bounds");
     fImageIncrementUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
                                              kVec2f_GrSLType, "ImageIncrement");
     fKernelUni = builder->addUniformArray(GrGLShaderBuilder::kFragment_Visibility,
                                              kFloat_GrSLType,
                                              "Kernel",
                                              fKernelSize.width() * fKernelSize.height());
     fTargetUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
@@ skipping 105 matching lines @@
     fGain(SkScalarToFloat(gain)),
     fBias(SkScalarToFloat(bias) / 255.0f),
     fTileMode(tileMode),
     fConvolveAlpha(convolveAlpha) {
     fKernel = new float[kernelSize.width() * kernelSize.height()];
     for (int i = 0; i < kernelSize.width() * kernelSize.height(); i++) {
         fKernel[i] = SkScalarToFloat(kernel[i]);
     }
     fTarget[0] = static_cast<float>(target.x());
     fTarget[1] = static_cast<float>(target.y());
+    this->setWillNotUseInputColor();
 }
 
 GrMatrixConvolutionEffect::~GrMatrixConvolutionEffect() {
     delete[] fKernel;
 }
 
 const GrBackendEffectFactory& GrMatrixConvolutionEffect::getFactory() const {
     return GrTBackendEffectFactory<GrMatrixConvolutionEffect>::getInstance();
 }
 
@@ skipping 67 matching lines @@
                                                 fBias,
                                                 fTarget,
                                                 fTileMode,
                                                 fConvolveAlpha);
     return true;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 #endif