Add XferProcessor factory in GrPaint and GrDrawState.

src/gpu/GrDrawState.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrDrawState_DEFINED
 #define GrDrawState_DEFINED
 
@@ skipping 197 matching lines @@
      * initial value (after construction or reset()) is 0xff. The constant
      * coverage is ignored when per-vertex coverage is provided.
      */
     void setCoverage(uint8_t coverage) {
         if (coverage != fCoverage) {
             fCoverage = coverage;
             fCoverageProcInfoValid = false;
         }
     }
 
+    /**
+     * Determines whether the output of the coverage stages will be single component.
+     */
+    bool coverageWillBeSingleComponent() const;
+
     /// @}
 
     /**
      * The geometry processor is the sole element of the skia pipeline which can use the vertex,
      * geometry, and tesselation shaders.  The GP may also compute a coverage in its fragment shader
      * but is never put in the color processing pipeline.
      */
 
     const GrGeometryProcessor* setGeometryProcessor(const GrGeometryProcessor* geometryProcessor) {
         SkASSERT(geometryProcessor);
@@ skipping 25 matching lines @@
 
     int numColorStages() const { return fColorStages.count(); }
     int numCoverageStages() const { return fCoverageStages.count(); }
     int numFragmentStages() const { return this->numColorStages() + this->numCoverageStages(); }
     int numTotalStages() const {
          return this->numFragmentStages() + (this->hasGeometryProcessor() ? 1 : 0);
     }
 
     bool hasGeometryProcessor() const { return SkToBool(fGeometryProcessor.get()); }
     const GrGeometryProcessor* getGeometryProcessor() const { return fGeometryProcessor.get(); }
+
+    const GrXPFactory* getXPFactory() const { return fXPFactory.get(); }
+
     const GrFragmentStage& getColorStage(int idx) const { return fColorStages[idx]; }
     const GrFragmentStage& getCoverageStage(int idx) const { return fCoverageStages[idx]; }
 
     /**
      * Checks whether any of the effects will read the dst pixel color.
      */
     bool willEffectReadDstColor() const;
 
     const GrFragmentProcessor* addColorProcessor(const GrFragmentProcessor* effect) {
         SkASSERT(effect);
@@ skipping 503 matching lines @@
     uint32_t                                fFlagBits;
     const GrVertexAttrib*                   fVAPtr;
     int                                     fVACount;
     size_t                                  fVAStride;
     GrStencilSettings                       fStencilSettings;
     uint8_t                                 fCoverage;
     DrawFace                                fDrawFace;
     GrBlendCoeff                            fSrcBlend;
     GrBlendCoeff                            fDstBlend;
     SkAutoTUnref<const GrGeometryProcessor> fGeometryProcessor;
+    SkAutoTUnref<const GrXPFactory>         fXPFactory;
     FragmentStageArray                      fColorStages;
     FragmentStageArray                      fCoverageStages;
     uint32_t                                fHints;
 
     // This is simply a different representation of info in fVertexAttribs and thus does
     // not need to be compared in op==.
     int fFixedFunctionVertexAttribIndices[kGrFixedFunctionVertexAttribBindingCnt];
 
     mutable GrProcOptInfo fColorProcInfo;
     mutable GrProcOptInfo fCoverageProcInfo;
     mutable bool fColorProcInfoValid;
     mutable bool fCoverageProcInfoValid;
 
     friend class GrOptDrawState;
 };
 
 #endif