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

src/gpu/GrClipMaskManager.cpp

Index: src/gpu/GrClipMaskManager.cpp
diff --git a/src/gpu/GrClipMaskManager.cpp b/src/gpu/GrClipMaskManager.cpp
index f86aa9de29f7e1eb649972d4b88179505ab1c614..f8386b5c3123c660001a12185b8eeb186a06a762 100644
--- a/src/gpu/GrClipMaskManager.cpp
+++ b/src/gpu/GrClipMaskManager.cpp
@@ -18,9 +18,10 @@
 #include "SkRasterClip.h"
 #include "SkStrokeRec.h"
 #include "SkTLazy.h"
-#include "effects/GrTextureDomain.h"
 #include "effects/GrConvexPolyEffect.h"
+#include "effects/GrPorterDuffXferProcessor.h"
 #include "effects/GrRRectEffect.h"
+#include "effects/GrTextureDomain.h"
 
 #define GR_AA_CLIP 1
 typedef SkClipStack::Element Element;
@@ -332,29 +333,31 @@ namespace {
 // set up the OpenGL blend function to perform the specified
 // boolean operation for alpha clip mask creation
 void setup_boolean_blendcoeffs(SkRegion::Op op, GrDrawState* drawState) {
+    GrXPFactory* xpFactory = NULL;
     switch (op) {
         case SkRegion::kReplace_Op:
-            drawState->setBlendFunc(kOne_GrBlendCoeff, kZero_GrBlendCoeff);
+            xpFactory = GrPorterDuffXPFactory::Create(kOne_GrBlendCoeff, kZero_GrBlendCoeff);
             break;
         case SkRegion::kIntersect_Op:
-            drawState->setBlendFunc(kDC_GrBlendCoeff, kZero_GrBlendCoeff);
+            xpFactory = GrPorterDuffXPFactory::Create(kDC_GrBlendCoeff, kZero_GrBlendCoeff);
             break;
         case SkRegion::kUnion_Op:
-            drawState->setBlendFunc(kOne_GrBlendCoeff, kISC_GrBlendCoeff);
+            xpFactory = GrPorterDuffXPFactory::Create(kOne_GrBlendCoeff, kISC_GrBlendCoeff);
             break;
         case SkRegion::kXOR_Op:
-            drawState->setBlendFunc(kIDC_GrBlendCoeff, kISC_GrBlendCoeff);
+            xpFactory = GrPorterDuffXPFactory::Create(kIDC_GrBlendCoeff, kISC_GrBlendCoeff);
             break;
         case SkRegion::kDifference_Op:
-            drawState->setBlendFunc(kZero_GrBlendCoeff, kISC_GrBlendCoeff);
+            xpFactory = GrPorterDuffXPFactory::Create(kZero_GrBlendCoeff, kISC_GrBlendCoeff);
             break;
         case SkRegion::kReverseDifference_Op:
-            drawState->setBlendFunc(kIDC_GrBlendCoeff, kZero_GrBlendCoeff);
+            xpFactory = GrPorterDuffXPFactory::Create(kIDC_GrBlendCoeff, kZero_GrBlendCoeff);
             break;
         default:
             SkASSERT(false);
             break;
     }
+    drawState->setXPFactory(xpFactory)->unref();
 }
 }