Add isSingleComponent bool to getConstantColorComponent

src/gpu/effects/GrConvolutionEffect.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrConvolutionEffect_DEFINED
 #define GrConvolutionEffect_DEFINED
 
@@ skipping 46 matching lines @@
 
     const float* bounds() const { return fBounds; }
     bool useBounds() const { return fUseBounds; }
 
     static const char* Name() { return "Convolution"; }
 
     typedef GrGLConvolutionEffect GLProcessor;
 
     virtual const GrBackendFragmentProcessorFactory& getFactory() const SK_OVERRIDE;
 
-    virtual void getConstantColorComponents(GrColor*, uint32_t* validFlags) const {
-        // If the texture was opaque we could know that the output color if we knew the sum of the
-        // kernel values.
-        *validFlags = 0;
-    }
-
     enum {
         // This was decided based on the min allowed value for the max texture
         // samples per fragment program run in DX9SM2 (32). A sigma param of 4.0
         // on a blur filter gives a kernel width of 25 while a sigma of 5.0
         // would exceed a 32 wide kernel.
         kMaxKernelRadius = 12,
         // With a C++11 we could have a constexpr version of WidthFromRadius()
         // and not have to duplicate this calculation.
         kMaxKernelWidth = 2 * kMaxKernelRadius + 1,
     };
@@ skipping 13 matching lines @@
 
     /// Convolve with a Gaussian kernel
     GrConvolutionEffect(GrTexture*, Direction,
                         int halfWidth,
                         float gaussianSigma,
                         bool useBounds,
                         float bounds[2]);
 
     virtual bool onIsEqual(const GrProcessor&) const SK_OVERRIDE;
 
+    virtual void onComputeInvariantOutput(InvariantOutput* inout) const {
+        // If the texture was opaque we could know that the output color if we knew the sum of the
+        // kernel values.
+        inout->fValidFlags = 0;
+        inout->fIsSingleComponent = false;
+    }
+
     GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
 
     typedef Gr1DKernelEffect INHERITED;
 };
 
 #endif