Potentially optimize some GrGLEffects for known input color values

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 306 matching lines @@
 };
 
 class GrGLMatrixConvolutionEffect : public GrGLEffect {
 public:
     GrGLMatrixConvolutionEffect(const GrBackendEffectFactory& factory,
                                 const GrDrawEffect& effect);
     virtual void emitCode(GrGLShaderBuilder*,
                           const GrDrawEffect&,
                           EffectKey,
                           const char* outputColor,
-                          const char* inputColor,
+                          const GrGLSLExpr4& inputColor,
                           const TransformedCoordsArray&,
                           const TextureSamplerArray&) SK_OVERRIDE;
 
     static inline EffectKey GenKey(const GrDrawEffect&, const GrGLCaps&);
 
     virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE;
 
 private:
     typedef GrGLUniformManager::UniformHandle        UniformHandle;
     typedef SkMatrixConvolutionImageFilter::TileMode TileMode;
@@ skipping 37 matching lines @@
             builder->fsCodeAppendf("clamp(%s, 0.0, 1.0) != %s ? vec4(0, 0, 0, 0) : ", coord, coord);
             break;
     }
     builder->fsAppendTextureLookup(sampler, coord);
 }
 
 void GrGLMatrixConvolutionEffect::emitCode(GrGLShaderBuilder* builder,
                                            const GrDrawEffect&,
                                            EffectKey key,
                                            const char* outputColor,
-                                           const char* inputColor,
+                                           const GrGLSLExpr4& inputColor,
                                            const TransformedCoordsArray& coords,
                                            const TextureSamplerArray& samplers) {
     sk_ignore_unused_variable(inputColor);
     SkString coords2D = builder->ensureFSCoords2D(coords, 0);
     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,
                                              kVec2f_GrSLType, "Target");
@@ skipping 168 matching lines @@
                                                 fBias,
                                                 fTarget,
                                                 fTileMode,
                                                 fConvolveAlpha);
     return true;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 #endif