Add isSingleComponent bool to getConstantColorComponent

src/gpu/effects/GrDistanceFieldTextureEffect.cpp

Index: src/gpu/effects/GrDistanceFieldTextureEffect.cpp
diff --git a/src/gpu/effects/GrDistanceFieldTextureEffect.cpp b/src/gpu/effects/GrDistanceFieldTextureEffect.cpp
index d5d334805c105eb56012bf8729353df9b1b99655..094d54c53f86865f96e4cbb099819c51b94710b4 100755
--- a/src/gpu/effects/GrDistanceFieldTextureEffect.cpp
+++ b/src/gpu/effects/GrDistanceFieldTextureEffect.cpp
@@ -206,14 +206,14 @@ bool GrDistanceFieldTextureEffect::onIsEqual(const GrProcessor& other) const {
            fFlags == cte.fFlags;
 }
 
-void GrDistanceFieldTextureEffect::getConstantColorComponents(GrColor* color,
-                                                             uint32_t* validFlags) const {
-    if ((*validFlags & kA_GrColorComponentFlag) && 0xFF == GrColorUnpackA(*color) &&
-        GrPixelConfigIsOpaque(this->texture(0)->config())) {
-        *validFlags = kA_GrColorComponentFlag;
+void GrDistanceFieldTextureEffect::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;
 }
 
 const GrBackendGeometryProcessorFactory& GrDistanceFieldTextureEffect::getFactory() const {
@@ -476,14 +476,14 @@ bool GrDistanceFieldLCDTextureEffect::onIsEqual(const GrProcessor& other) const
             fFlags == cte.fFlags);
 }
 
-void GrDistanceFieldLCDTextureEffect::getConstantColorComponents(GrColor* color,
-                                                                 uint32_t* validFlags) const {
-    if ((*validFlags & kA_GrColorComponentFlag) && 0xFF == GrColorUnpackA(*color) &&
-        GrPixelConfigIsOpaque(this->texture(0)->config())) {
-        *validFlags = kA_GrColorComponentFlag;
+void GrDistanceFieldLCDTextureEffect::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;
 }
 
 const GrBackendGeometryProcessorFactory& GrDistanceFieldLCDTextureEffect::getFactory() const {