Add isSingleComponent bool to getConstantColorComponent

src/gpu/GrProcessor.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrProcessor.h"
 #include "GrBackendProcessorFactory.h"
 #include "GrContext.h"
@@ skipping 70 matching lines @@
 void GrProcessor::assertEquality(const GrProcessor& other) const {
     SkASSERT(this->numTransforms() == other.numTransforms());
     for (int i = 0; i < this->numTransforms(); ++i) {
         SkASSERT(this->coordTransform(i) == other.coordTransform(i));
     }
     SkASSERT(this->numTextures() == other.numTextures());
     for (int i = 0; i < this->numTextures(); ++i) {
         SkASSERT(this->textureAccess(i) == other.textureAccess(i));
     }
 }
+
+void GrProcessor::InvarientOutput::validate() const {
+    if (isSingleComponent) {
+        SkASSERT(0 == validFlags || kRGBA_GrColorComponentFlags == validFlags);
+        if (kRGBA_GrColorComponentFlags == validFlags) {
+            SkASSERT(this->colorComponentsAllEqual());
+        }
+    }

[bsalomon, 2014/09/30 00:41:01]

else {
  SkASSERT(!kRGBA || !<all components the same>);
}
?

[egdaniel, 2014/10/02 14:58:33]

Once we have better helper functions that will set the correct single/four
component bool, I will add this assert in

+}
+
+bool GrProcessor::InvarientOutput::colorComponentsAllEqual() const {
+    unsigned colorA = GrColorUnpackA(color);
+    return(GrColorUnpackR(color) == colorA &&
+           GrColorUnpackG(color) == colorA &&
+           GrColorUnpackB(color) == colorA);
+}
 #endif