Move willUseInputColor check to computeInvariantOutput

src/gpu/effects/GrYUVtoRGBEffect.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gl/builders/GrGLProgramBuilder.h"
 #include "GrYUVtoRGBEffect.h"
 
@@ skipping 81 matching lines @@
      : fCoordTransform(kLocal_GrCoordSet, GrCoordTransform::MakeDivByTextureWHMatrix(yTexture),
                        yTexture)
     , fYAccess(yTexture)
     , fUAccess(uTexture)
     , fVAccess(vTexture)
     , fColorSpace(colorSpace) {
         this->addCoordTransform(&fCoordTransform);
         this->addTextureAccess(&fYAccess);
         this->addTextureAccess(&fUAccess);
         this->addTextureAccess(&fVAccess);
-        this->setWillNotUseInputColor();
     }
 
     virtual bool onIsEqual(const GrFragmentProcessor& sBase) const {
         const YUVtoRGBEffect& s = sBase.cast<YUVtoRGBEffect>();
         return fYAccess.getTexture() == s.fYAccess.getTexture() &&
                fUAccess.getTexture() == s.fUAccess.getTexture() &&
                fVAccess.getTexture() == s.fVAccess.getTexture() &&
                fColorSpace == s.getColorSpace();
     }
 
     virtual void onComputeInvariantOutput(InvariantOutput* inout) const SK_OVERRIDE {
         // YUV is opaque
-        inout->setToOther(kA_GrColorComponentFlag, 0xFF << GrColor_SHIFT_A);
+        inout->setToOther(kA_GrColorComponentFlag, 0xFF << GrColor_SHIFT_A,
+                          InvariantOutput::kWill_ReadInput);
     }
 
     GrCoordTransform fCoordTransform;
     GrTextureAccess fYAccess;
     GrTextureAccess fUAccess;
     GrTextureAccess fVAccess;
     SkYUVColorSpace fColorSpace;
 
     typedef GrFragmentProcessor INHERITED;
 };
@@ skipping 10 matching lines @@
     0.0f,    0.0f,    0.0f,    1.0};
 }
 
 //////////////////////////////////////////////////////////////////////////////
 
 GrFragmentProcessor*
 GrYUVtoRGBEffect::Create(GrTexture* yTexture, GrTexture* uTexture, GrTexture* vTexture,
                          SkYUVColorSpace colorSpace) {
     return YUVtoRGBEffect::Create(yTexture, uTexture, vTexture, colorSpace);
 }