Draft change to start pulling uniform color into GP

include/gpu/effects/GrPorterDuffXferProcessor.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrPorterDuffXferProcessor_DEFINED
 #define GrPorterDuffXferProcessor_DEFINED
 
@@ skipping 19 matching lines @@
 
     GrGLXferProcessor* createGLInstance() const SK_OVERRIDE;
 
     virtual bool hasSecondaryOutput() const SK_OVERRIDE;
 
     ///////////////////////////////////////////////////////////////////////////
     /// @name Stage Output Types
     ////
 
     enum PrimaryOutputType {
+        kNone_PrimaryOutputType,
+        kColor_PrimaryOutputType,
+        kCoverage_PrimaryOutputType,
         // Modulate color and coverage, write result as the color output.
         kModulate_PrimaryOutputType,
         // Combines the coverage, dst, and color as coverage * color + (1 - coverage) * dst. This
         // can only be set if fDstReadKey is non-zero.
         kCombineWithDst_PrimaryOutputType,
     };
 
     enum SecondaryOutputType {
         // There is no secondary output
         kNone_SecondaryOutputType,
@@ skipping 11 matching lines @@
     };
 
     PrimaryOutputType primaryOutputType() const { return fPrimaryOutputType; }
     SecondaryOutputType secondaryOutputType() const { return fSecondaryOutputType; }
 
     GrXferProcessor::OptFlags getOptimizations(const GrProcOptInfo& colorPOI,
                                                const GrProcOptInfo& coveragePOI,
                                                bool isCoverageDrawing,
                                                bool colorWriteDisabled,
                                                bool doesStencilWrite,
-                                               GrColor* color,
-                                               uint8_t* coverage,
+                                               GrColor* overrideColor,
                                                const GrDrawTargetCaps& caps) SK_OVERRIDE;
 
     void getBlendInfo(GrXferProcessor::BlendInfo* blendInfo) const SK_OVERRIDE {
         blendInfo->fSrcBlend = fSrcBlend;
         blendInfo->fDstBlend = fDstBlend;
         blendInfo->fBlendConstant = fBlendConstant;
     }
 
 private:
     GrPorterDuffXferProcessor(GrBlendCoeff srcBlend, GrBlendCoeff dstBlend, GrColor constant);
 
     bool onIsEqual(const GrXferProcessor& xpBase) const SK_OVERRIDE {
         const GrPorterDuffXferProcessor& xp = xpBase.cast<GrPorterDuffXferProcessor>();
         if (fSrcBlend != xp.fSrcBlend ||
             fDstBlend != xp.fDstBlend ||
             fBlendConstant != xp.fBlendConstant ||
             fPrimaryOutputType != xp.fPrimaryOutputType || 
             fSecondaryOutputType != xp.fSecondaryOutputType) {
             return false;
         }
         return true;
     }
 
     void onComputeInvariantOutput(GrInvariantOutput* inout) const SK_OVERRIDE;
 
     GrXferProcessor::OptFlags internalGetOptimizations(const GrProcOptInfo& colorPOI,
                                                        const GrProcOptInfo& coveragePOI,
                                                        bool isCoverageDrawing,
                                                        bool colorWriteDisabled,
-                                                       bool doesStencilWrite,
-                                                       GrColor* color,
-                                                       uint8_t* coverage);
+                                                       bool doesStencilWrite);
 
     void calcOutputTypes(GrXferProcessor::OptFlags blendOpts, const GrDrawTargetCaps& caps,
                          bool hasSolidCoverage, bool readDst);
 
     GrBlendCoeff fSrcBlend;
     GrBlendCoeff fDstBlend;
     GrColor      fBlendConstant;
     PrimaryOutputType fPrimaryOutputType;
     SecondaryOutputType fSecondaryOutputType;
 
@@ skipping 42 matching lines @@
 
     GR_DECLARE_XP_FACTORY_TEST;
 
     GrBlendCoeff fSrcCoeff;
     GrBlendCoeff fDstCoeff;
 
     typedef GrXPFactory INHERITED;
 };
 
 #endif