Add isSingleComponent bool to getConstantColorComponent

src/effects/SkAlphaThresholdFilter.cpp

Index: src/effects/SkAlphaThresholdFilter.cpp
diff --git a/src/effects/SkAlphaThresholdFilter.cpp b/src/effects/SkAlphaThresholdFilter.cpp
index 09cc61851c6c43c071a8eb156c1d6f83995d8a50..455c62ef57120afabdfea38fab52be4487424ff4 100644
--- a/src/effects/SkAlphaThresholdFilter.cpp
+++ b/src/effects/SkAlphaThresholdFilter.cpp
@@ -76,8 +76,6 @@ public:
     static const char* Name() { return "Alpha Threshold"; }
 
     virtual const GrBackendFragmentProcessorFactory& getFactory() const SK_OVERRIDE;
-    virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE;
-
     float innerThreshold() const { return fInnerThreshold; }
     float outerThreshold() const { return fOuterThreshold; }
 
@@ -104,6 +102,8 @@ private:
 
     virtual bool onIsEqual(const GrProcessor&) const SK_OVERRIDE;
 
+    virtual void onComputeInvarientOutput(InvarientOutput* invarientOutput) const SK_OVERRIDE;
+
     GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
 
     float fInnerThreshold;
@@ -228,13 +228,13 @@ bool AlphaThresholdEffect::onIsEqual(const GrProcessor& sBase) const {
             this->fOuterThreshold == s.fOuterThreshold);
 }
 
-void AlphaThresholdEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const {
-    if ((*validFlags & kA_GrColorComponentFlag) && 0xFF == GrColorUnpackA(*color) &&
-        GrPixelConfigIsOpaque(this->texture(0)->config())) {
-        *validFlags = kA_GrColorComponentFlag;
+void AlphaThresholdEffect::onComputeInvarientOutput(InvarientOutput* invarientOutput) const {
+    if (invarientOutput->hasOpaqueAlpha() && GrPixelConfigIsOpaque(this->texture(0)->config())) {
+        invarientOutput->validFlags = kA_GrColorComponentFlag;
     } else {
-        *validFlags = 0;
+        invarientOutput->validFlags = 0;
     }
+    invarientOutput->isSingleComponent = false;
 }
 
 #endif