Make all blending up to GrOptDrawState be handled by the xp/xp factory.

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 175 matching lines @@
 
     // Finalize *MUST* be called before programDesc()
     void finalize(GrGpu*);
 
     const GrProgramDesc& programDesc() const { SkASSERT(fFinalized); return fDesc; }
 
 private:
     /**
      * Alter the program desc and inputs (attribs and processors) based on the blend optimization.
      */
-    void adjustProgramForBlendOpt(const GrDrawState& ds, GrDrawState::BlendOpt,
-                                  int* firstColorStageIdx, int* firstCoverageStageIdx);
-
-    /**
-     * Loop over the effect stages to determine various info like what data they will read and what
-     * shaders they require.
-     */
-    void getStageStats(const GrDrawState& ds, int firstColorStageIdx, int firstCoverageStageIdx,
-                       bool hasLocalCoords);
+    void adjustProgramFromBlendOpts(const GrDrawState& ds,
+                                    GrXferProcessor::BlendOptFlags,
+                                    const GrProcOptInfo& colorPOI,
+                                    const GrProcOptInfo& coveragePOI,
+                                    int* firstColorStageIdx,
+                                    int* firstCoverageStageIdx);
 
     /**
      * Calculates the primary and secondary output types of the shader. For certain output types
      * the function may adjust the blend coefficients. After this function is called the src and dst
      * blend coeffs will represent those used by backend API.
      */
-    void setOutputStateInfo(const GrDrawState& ds, GrDrawState::BlendOpt, const GrDrawTargetCaps&);
+    void setOutputStateInfo(const GrDrawState& ds, GrXferProcessor::BlendOptFlags,
+                            const GrDrawTargetCaps&);
 
     enum Flags {
         kDither_Flag            = 0x1,
         kHWAA_Flag              = 0x2,
         kDisableColorWrite_Flag = 0x4,
     };
 
     typedef GrPendingIOResource<GrRenderTarget, kWrite_GrIOType> RenderTarget;
     typedef SkSTArray<8, GrPendingFragmentStage> FragmentStageArray;
     typedef GrPendingProgramElement<const GrGeometryProcessor> ProgramGeometryProcessor;
@@ skipping 19 matching lines @@
 
     // This function is equivalent to the offset into fFragmentStages where coverage stages begin.
     int                                 fNumColorStages;
 
     GrProgramDesc fDesc;
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif