Create helper functions to use in computeInvariantOutput calls

src/gpu/GrOvalRenderer.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrOvalRenderer.h"
 
 #include "gl/builders/GrGLProgramBuilder.h"
@@ skipping 128 matching lines @@
                             GrShaderVar::kAttribute_TypeModifier))) {
         fStroke = stroke;
     }
 
     virtual bool onIsEqual(const GrProcessor& other) const SK_OVERRIDE {
         const CircleEdgeEffect& cee = other.cast<CircleEdgeEffect>();
         return cee.fStroke == fStroke;
     }
 
     virtual void onComputeInvariantOutput(InvariantOutput* inout) const SK_OVERRIDE {
-        inout->fValidFlags = 0;
-        inout->fIsSingleComponent = false;
+        inout->mulByUnknownAlpha();
     }
 
     const GrShaderVar& fInCircleEdge;
     bool fStroke;
 
     GR_DECLARE_GEOMETRY_PROCESSOR_TEST;
 
     typedef GrGeometryProcessor INHERITED;
 };
 
@@ skipping 119 matching lines @@
                             GrShaderVar::kAttribute_TypeModifier))) {
         fStroke = stroke;
     }
 
     virtual bool onIsEqual(const GrProcessor& other) const SK_OVERRIDE {
         const EllipseEdgeEffect& eee = other.cast<EllipseEdgeEffect>();
         return eee.fStroke == fStroke;
     }
 
     virtual void onComputeInvariantOutput(InvariantOutput* inout) const SK_OVERRIDE {
-        inout->fValidFlags = 0;
-        inout->fIsSingleComponent = false;
+        inout->mulByUnknownAlpha();
     }
 
     const GrShaderVar& fInEllipseOffset;
     const GrShaderVar& fInEllipseRadii;
     bool fStroke;
 
     GR_DECLARE_GEOMETRY_PROCESSOR_TEST;
 
     typedef GrGeometryProcessor INHERITED;
 };
@@ skipping 147 matching lines @@
                             GrShaderVar::kAttribute_TypeModifier))) {
         fMode = mode;
     }
 
     virtual bool onIsEqual(const GrProcessor& other) const SK_OVERRIDE {
         const DIEllipseEdgeEffect& eee = other.cast<DIEllipseEdgeEffect>();
         return eee.fMode == fMode;
     }
 
     virtual void onComputeInvariantOutput(InvariantOutput* inout) const SK_OVERRIDE {
-        inout->fValidFlags = 0;
-        inout->fIsSingleComponent = false;
+        inout->mulByUnknownAlpha();
     }
 
     const GrShaderVar& fInEllipseOffsets0;
     const GrShaderVar& fInEllipseOffsets1;
     Mode fMode;
 
     GR_DECLARE_GEOMETRY_PROCESSOR_TEST;
 
     typedef GrGeometryProcessor INHERITED;
 };
@@ skipping 766 matching lines @@
 
         // drop out the middle quad if we're stroked
         int indexCnt = isStrokeOnly ? SK_ARRAY_COUNT(gRRectIndices) - 6 :
                                       SK_ARRAY_COUNT(gRRectIndices);
         target->setIndexSourceToBuffer(indexBuffer);
         target->drawIndexed(kTriangles_GrPrimitiveType, 0, 0, 16, indexCnt, &bounds);
     }
 
     return true;
 }