Pass in ProcOptInfos into willNeedDstCopy on XPs

include/gpu/GrXferProcessor.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 GrXferProcessor_DEFINED
 #define GrXferProcessor_DEFINED
 
@@ skipping 215 matching lines @@
     virtual void getInvariantOutput(const GrProcOptInfo& colorPOI, const GrProcOptInfo& coveragePOI,
                                     InvariantOutput*) const = 0;
 
     /**
      * Determines whether multiplying the computed per-pixel color by the pixel's fractional
      * coverage before the blend will give the correct final destination color. In general it
      * will not as coverage is applied after blending.
      */
     virtual bool canTweakAlphaForCoverage() const = 0;
 
-    bool willNeedDstCopy(const GrDrawTargetCaps& caps) const; 
+    bool willNeedDstCopy(const GrDrawTargetCaps& caps, const GrProcOptInfo& colorPOI,
+                         const GrProcOptInfo& coveragePOI) const;
 
     bool isEqual(const GrXPFactory& that) const {
         if (this->classID() != that.classID()) {
             return false;
         }
         return this->onIsEqual(that);
     }
 
     /**
       * Helper for down-casting to a GrXPFactory subclass
@@ skipping 13 matching lines @@
     uint32_t fClassID;
 
 private:
     virtual GrXferProcessor* onCreateXferProcessor(const GrProcOptInfo& colorPOI,
                                                    const GrProcOptInfo& coveragePOI,
                                                    const GrDeviceCoordTexture* dstCopy) const = 0;
     /**
      *  Returns true if the XP generated by this factory will explicitly read dst in the fragment
      *  shader.
      */
-    virtual bool willReadDstColor() const = 0;
+    virtual bool willReadDstColor(const GrProcOptInfo& colorPOI,
+                                  const GrProcOptInfo& coveragePOI) const = 0;
 
     virtual bool onIsEqual(const GrXPFactory&) const = 0;
 
     static uint32_t GenClassID() {
         // fCurrXPFactoryID has been initialized to kIllegalXPFactoryID. The
         // atomic inc returns the old value not the incremented value. So we add
         // 1 to the returned value.
         uint32_t id = static_cast<uint32_t>(sk_atomic_inc(&gCurrXPFClassID)) + 1;
         if (!id) {
             SkFAIL("This should never wrap as it should only be called once for each GrXPFactory "
                    "subclass.");
         }
         return id;
     }
 
     enum {
         kIllegalXPFClassID = 0,
     };
     static int32_t gCurrXPFClassID;
 
     typedef GrProgramElement INHERITED;
 };
 
 #endif