Add an InvariantOutput for the XPF.

src/gpu/GrDrawState.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrDrawState.h"
 
 #include "GrBlend.h"
@@ skipping 321 matching lines @@
 
 GrDrawState::~GrDrawState() {
     SkASSERT(0 == fBlockEffectRemovalCnt);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 
 bool GrDrawState::willBlendWithDst(const GrPrimitiveProcessor* pp) const {
     this->calcColorInvariantOutput(pp);
     this->calcCoverageInvariantOutput(pp);
-    return fXPFactory->willBlendWithDst(fColorProcInfo, fCoverageProcInfo,
-                                        this->isColorWriteDisabled());
+    
+    GrXPFactory::InvariantOutput output;
+    fXPFactory->getInvariantOutput(fColorProcInfo, fCoverageProcInfo, this->isColorWriteDisabled(),
+                                   &output);
+    return output.fWillBlendWithDst;
 }
 
 void GrDrawState::calcColorInvariantOutput(const GrPrimitiveProcessor* pp) const {
     if (!fColorProcInfoValid || fColorPrimProc != pp) {
         fColorProcInfo.calcColorWithPrimProc(pp, fColorStages.begin(), this->numColorStages());
         fColorProcInfoValid = true;
         fColorPrimProc = pp;
     }
 }
 
@@ skipping 19 matching lines @@
 void GrDrawState::calcCoverageInvariantOutput(GrColor coverage) const {
     if (!fCoverageProcInfoValid || coverage != fCoverageCache) {
         GrColorComponentFlags flags = kRGBA_GrColorComponentFlags;
         fCoverageProcInfo.calcWithInitialValues(fCoverageStages.begin(),
                                                 this->numCoverageStages(), coverage, flags,
                                                 true);
         fCoverageProcInfoValid = true;
         fCoverageCache = coverage;
     }
 }