Add isSingleComponent bool to getConstantColorComponent

src/gpu/GrOptDrawState.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrOptDrawState.h"
 
 #include "GrDrawState.h"
@@ skipping 152 matching lines @@
         ++dst;
     }
     fVACount -= numToRemove;
     fVAPtr = fOptVA.get();
 }
 
 void GrOptDrawState::copyEffectiveColorStages(const GrDrawState& ds) {
     int firstColorStage = 0;
 
     // Set up color and flags for ConstantColorComponent checks
-    GrColor color;
-    uint32_t validComponentFlags;
+    GrProcessor::InvariantOutput inout;
+    inout.fIsSingleComponent = false;
     if (!this->hasColorVertexAttribute()) {
-        color = ds.getColor();
-        validComponentFlags = kRGBA_GrColorComponentFlags;
+        inout.fColor = ds.getColor();
+        inout.fValidFlags = kRGBA_GrColorComponentFlags;
     } else {
         if (ds.vertexColorsAreOpaque()) {
-            color = 0xFF << GrColor_SHIFT_A;
-            validComponentFlags = kA_GrColorComponentFlag;
+            inout.fColor = 0xFF << GrColor_SHIFT_A;
+            inout.fValidFlags = kA_GrColorComponentFlag;
         } else {
-            validComponentFlags = 0;
-            color = 0; // not strictly necessary but we get false alarms from tools about uninit.
+            inout.fValidFlags = 0;
+            // not strictly necessary but we get false alarms from tools about uninit.
+            inout.fColor = 0;
         }
     }
 
     for (int i = 0; i < ds.numColorStages(); ++i) {
         const GrFragmentProcessor* fp = ds.getColorStage(i).getFragmentProcessor();
         if (!fp->willUseInputColor()) {
             firstColorStage = i;
             fInputColorIsUsed = false;
         }
-        fp->getConstantColorComponents(&color, &validComponentFlags);
-        if (kRGBA_GrColorComponentFlags == validComponentFlags) {
+        fp->computeInvariantOutput(&inout);
+        if (kRGBA_GrColorComponentFlags == inout.fValidFlags) {
             firstColorStage = i + 1;
-            fColor = color;
+            fColor = inout.fColor;
             fInputColorIsUsed = true;
             this->removeFixedFunctionVertexAttribs(0x1 << kColor_GrVertexAttribBinding);
         }
     }
     if (firstColorStage < ds.numColorStages()) {
         fColorStages.reset(&ds.getColorStage(firstColorStage),
                            ds.numColorStages() - firstColorStage);
     } else {
         fColorStages.reset();
     }
@@ skipping 122 matching lines @@
         }
     }
 
     SkASSERT(0 == memcmp(this->fFixedFunctionVertexAttribIndices,
                          that.fFixedFunctionVertexAttribIndices,
                          sizeof(this->fFixedFunctionVertexAttribIndices)));
 
     return true;
 }