Create helper functions to use in computeInvariantOutput calls

src/gpu/effects/GrRRectEffect.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 "gl/builders/GrGLProgramBuilder.h"
 #include "GrRRectEffect.h"
 
@@ skipping 69 matching lines @@
 GrFragmentProcessor* CircularRRectEffect::Create(GrPrimitiveEdgeType edgeType,
                                                  uint32_t circularCornerFlags,
                                                  const SkRRect& rrect) {
     if (kFillAA_GrProcessorEdgeType != edgeType && kInverseFillAA_GrProcessorEdgeType != edgeType) {
         return NULL;
     }
     return SkNEW_ARGS(CircularRRectEffect, (edgeType, circularCornerFlags, rrect));
 }
 
 void CircularRRectEffect::onComputeInvariantOutput(InvariantOutput* inout) const {
-    inout->fValidFlags = 0;
-    inout->fIsSingleComponent = false;
+    inout->mulByUnknownAlpha();
 }
 
 const GrBackendFragmentProcessorFactory& CircularRRectEffect::getFactory() const {
     return GrTBackendFragmentProcessorFactory<CircularRRectEffect>::getInstance();
 }
 
 CircularRRectEffect::CircularRRectEffect(GrPrimitiveEdgeType edgeType, uint32_t circularCornerFlags,
                                          const SkRRect& rrect)
     : fRRect(rrect)
     , fEdgeType(edgeType)
@@ skipping 317 matching lines @@
 
 GrFragmentProcessor*
 EllipticalRRectEffect::Create(GrPrimitiveEdgeType edgeType, const SkRRect& rrect) {
     if (kFillAA_GrProcessorEdgeType != edgeType && kInverseFillAA_GrProcessorEdgeType != edgeType) {
         return NULL;
     }
     return SkNEW_ARGS(EllipticalRRectEffect, (edgeType, rrect));
 }
 
 void EllipticalRRectEffect::onComputeInvariantOutput(InvariantOutput* inout) const {
-    inout->fValidFlags = 0;
-    inout->fIsSingleComponent = false;
+    inout->mulByUnknownAlpha();
 }
 
 const GrBackendFragmentProcessorFactory& EllipticalRRectEffect::getFactory() const {
     return GrTBackendFragmentProcessorFactory<EllipticalRRectEffect>::getInstance();
 }
 
 EllipticalRRectEffect::EllipticalRRectEffect(GrPrimitiveEdgeType edgeType, const SkRRect& rrect)
     : fRRect(rrect)
     , fEdgeType(edgeType){
     this->setWillReadFragmentPosition();
@@ skipping 289 matching lines @@
                 if (rrect.isNinePatch()) {
                     return EllipticalRRectEffect::Create(edgeType, rrect);
                 }
                 return NULL;
             }
         }
     }
 
     return NULL;
 }