Remove willReadDst from GrFragmentProcessor.

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 23 matching lines @@
     ///////////////////////////////////////////////////////////////////////////
     /// @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,
         // Writes coverage as the secondary output. Only set if dual source blending is supported
         // and primary output is kModulate.
         kCoverage_SecondaryOutputType,
         // Writes coverage * (1 - colorA) as the secondary output. Only set if dual source blending
         // is supported and primary output is kModulate.
@@ skipping 33 matching lines @@
             return false;
         }
         return true;
     }
 
     GrXferProcessor::OptFlags internalGetOptimizations(const GrProcOptInfo& colorPOI,
                                                        const GrProcOptInfo& coveragePOI,
                                                        bool doesStencilWrite);
 
     void calcOutputTypes(GrXferProcessor::OptFlags blendOpts, const GrDrawTargetCaps& caps,
-                         bool hasSolidCoverage, bool readDst);
+                         bool hasSolidCoverage);
 
     GrBlendCoeff fSrcBlend;
     GrBlendCoeff fDstBlend;
     GrColor      fBlendConstant;
     PrimaryOutputType fPrimaryOutputType;
     SecondaryOutputType fSecondaryOutputType;
 
     typedef GrXferProcessor INHERITED;
 };
 
@@ skipping 17 matching lines @@
     bool supportsRGBCoverage(GrColor knownColor, uint32_t knownColorFlags) const SK_OVERRIDE;
 
     bool canApplyCoverage(const GrProcOptInfo& colorPOI,
                           const GrProcOptInfo& coveragePOI) const SK_OVERRIDE;
 
     bool canTweakAlphaForCoverage() const SK_OVERRIDE;
 
     void getInvariantOutput(const GrProcOptInfo& colorPOI, const GrProcOptInfo& coveragePOI,
                             GrXPFactory::InvariantOutput*) const SK_OVERRIDE;
 
-    bool willReadDst(const GrProcOptInfo& colorPOI,
-                     const GrProcOptInfo& coveragePOI) const SK_OVERRIDE;
+    bool willReadDst() const SK_OVERRIDE { return false; }
 
 private:
     GrPorterDuffXPFactory(GrBlendCoeff src, GrBlendCoeff dst); 
 
     bool onIsEqual(const GrXPFactory& xpfBase) const SK_OVERRIDE {
         const GrPorterDuffXPFactory& xpf = xpfBase.cast<GrPorterDuffXPFactory>();
         return (fSrcCoeff == xpf.fSrcCoeff && fDstCoeff == xpf.fDstCoeff);
     }
 
     GR_DECLARE_XP_FACTORY_TEST;
 
     GrBlendCoeff fSrcCoeff;
     GrBlendCoeff fDstCoeff;
 
     typedef GrXPFactory INHERITED;
 };
 
 #endif