Create xfer processor backend.

src/gpu/GrOptDrawState.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 GrOptDrawState_DEFINED
 #define GrOptDrawState_DEFINED
 
@@ skipping 61 matching lines @@
     ///
     /// The input color to the first color-stage is either the constant color or interpolated
     /// per-vertex colors. The input to the first coverage stage is either a constant coverage
     /// (usually full-coverage) or interpolated per-vertex coverage.
     ////
 
     int numColorStages() const { return fNumColorStages; }
     int numCoverageStages() const { return fFragmentStages.count() - fNumColorStages; }
     int numFragmentStages() const { return fFragmentStages.count(); }
     int numTotalStages() const {
-         return this->numFragmentStages() + (this->hasGeometryProcessor() ? 1 : 0);
+        // the + 1 at the end is for the xferProcessor which will always be present
+        return this->numFragmentStages() + (this->hasGeometryProcessor() ? 1 : 0) + 1;
     }
 
     bool hasGeometryProcessor() const { return SkToBool(fGeometryProcessor.get()); }
     const GrGeometryProcessor* getGeometryProcessor() const { return fGeometryProcessor.get(); }
     const GrBatchTracker& getBatchTracker() const { return fBatchTracker; }
 
     const GrXferProcessor* getXferProcessor() const { return fXferProcessor.get(); }
 
     const GrPendingFragmentStage& getColorStage(int idx) const {
         SkASSERT(idx < this->numColorStages());
         return fFragmentStages[idx];
     }
     const GrPendingFragmentStage& getCoverageStage(int idx) const {
         SkASSERT(idx < this->numCoverageStages());
         return fFragmentStages[fNumColorStages + idx];
     }
     const GrPendingFragmentStage& getFragmentStage(int idx) const {
         return fFragmentStages[idx];
     }
 
     /// @}
 
     ///////////////////////////////////////////////////////////////////////////
-    /// @name Blending
-    ////
-
-    GrBlendCoeff getSrcBlendCoeff() const { return fSrcBlend; }
-    GrBlendCoeff getDstBlendCoeff() const { return fDstBlend; }
-
-    /**
-     * Retrieves the last value set by setBlendConstant()
-     * @return the blending constant value
-     */
-    GrColor getBlendConstant() const { return fBlendConstant; }
-
-    /// @}
-
-    ///////////////////////////////////////////////////////////////////////////
     /// @name View Matrix
     ////
 
     /**
      * Retrieves the current view matrix
      * @return the current view matrix.
      */
     const SkMatrix& getViewMatrix() const { return fViewMatrix; }
 
     /// @}
@@ skipping 85 matching lines @@
     };
 
     typedef GrPendingIOResource<GrRenderTarget, kWrite_GrIOType> RenderTarget;
     typedef SkSTArray<8, GrPendingFragmentStage> FragmentStageArray;
     typedef GrPendingProgramElement<const GrGeometryProcessor> ProgramGeometryProcessor;
     typedef GrPendingProgramElement<const GrXferProcessor> ProgramXferProcessor;
     RenderTarget                        fRenderTarget;
     ScissorState                        fScissorState;
     GrColor                             fColor;
     SkMatrix                            fViewMatrix;
-    GrColor                             fBlendConstant;
     GrStencilSettings                   fStencilSettings;
     uint8_t                             fCoverage;
     GrDrawState::DrawFace               fDrawFace;
     GrDeviceCoordTexture                fDstCopy;
-    GrBlendCoeff                        fSrcBlend;
-    GrBlendCoeff                        fDstBlend;
     uint32_t                            fFlags;
     ProgramGeometryProcessor            fGeometryProcessor;
     GrBatchTracker                      fBatchTracker;
     ProgramXferProcessor                fXferProcessor;
     FragmentStageArray                  fFragmentStages;
     GrGpu::DrawType                     fDrawType;
     GrProgramDesc::DescInfo             fDescInfo;
     bool                                fFinalized;
 
     // This function is equivalent to the offset into fFragmentStages where coverage stages begin.
     int                                 fNumColorStages;
 
     GrProgramDesc fDesc;
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif