Add isSingleComponent bool to getConstantColorComponent

Initial step to allowing effects to use/output 1 or 4 color/coverage components. This cl doesn't change any current logic and all effects still assume they are working with 4 components.

BUG=skia:

Review URL: https://codereview.chromium.org/608253002

1 files changed, 5 insertions, 3 deletions

diff --git a/src/effects/SkMorphologyImageFilter.cpp b/src/effects/SkMorphologyImageFilter.cpp
index 397e43193e..4c7f62482c 100644
--- a/src/effects/SkMorphologyImageFilter.cpp
+++ b/src/effects/SkMorphologyImageFilter.cpp
@@ -309,7 +309,6 @@ public:
     typedef GrGLMorphologyEffect GLProcessor;
 
     virtual const GrBackendFragmentProcessorFactory& getFactory() const SK_OVERRIDE;
-    virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE;
 
 protected:
 
@@ -318,6 +317,8 @@ protected:
 private:
     virtual bool onIsEqual(const GrProcessor&) const SK_OVERRIDE;
 
+    virtual void onComputeInvariantOutput(InvariantOutput* inout) const SK_OVERRIDE;
+
     GrMorphologyEffect(GrTexture*, Direction, int radius, MorphologyType);
 
     GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
@@ -455,10 +456,11 @@ bool GrMorphologyEffect::onIsEqual(const GrProcessor& sBase) const {
             this->type() == s.type());
 }
 
-void GrMorphologyEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const {
+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->updateConstantColorComponentsForModulation(color, validFlags);
+    this->updateInvariantOutputForModulation(inout);
+    inout->fIsSingleComponent = false;
 }
 
 ///////////////////////////////////////////////////////////////////////////////