Create helper functions to use in computeInvariantOutput calls

src/effects/SkMorphologyImageFilter.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 "SkMorphologyImageFilter.h"
 #include "SkBitmap.h"
 #include "SkColorPriv.h"
@@ skipping 442 matching lines @@
     return (this->texture(0) == s.texture(0) &&
             this->radius() == s.radius() &&
             this->direction() == s.direction() &&
             this->type() == s.type());
 }
 
 void GrMorphologyEffect::onComputeInvariantOutput(InvariantOutput* inout) const {
     // This is valid because the color components of the result of the kernel all come
     // exactly from existing values in the source texture.
     this->updateInvariantOutputForModulation(inout);
-    inout->fIsSingleComponent = false;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrMorphologyEffect);
 
 GrFragmentProcessor* GrMorphologyEffect::TestCreate(SkRandom* random,
                                                     GrContext*,
                                                     const GrDrawTargetCaps&,
                                                     GrTexture* textures[]) {
@@ skipping 130 matching lines @@
                                          SkBitmap* result, SkIPoint* offset) const {
     return this->filterImageGPUGeneric(true, proxy, src, ctx, result, offset);
 }
 
 bool SkErodeImageFilter::filterImageGPU(Proxy* proxy, const SkBitmap& src, const Context& ctx,
                                         SkBitmap* result, SkIPoint* offset) const {
     return this->filterImageGPUGeneric(false, proxy, src, ctx, result, offset);
 }
 
 #endif