Implement support for KHR_blend_equation_advanced

src/gpu/SkGr.cpp

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkGr.h"
 
 #include "GrXferProcessor.h"
@@ skipping 632 matching lines @@
 ///////////////////////////////////////////////////////////////////////////////
 
 bool SkPaint2GrPaintNoShader(GrContext* context, GrRenderTarget* rt, const SkPaint& skPaint,
                              GrColor paintColor, bool constantColor, GrPaint* grPaint) {
 
     grPaint->setDither(skPaint.isDither());
     grPaint->setAntiAlias(skPaint.isAntiAlias());
 
     SkXfermode* mode = skPaint.getXfermode();
     GrXPFactory* xpFactory = NULL;
-    if (!SkXfermode::AsXPFactory(mode, &xpFactory)) {
+    if (!SkXfermode::AsXPFactory(mode, context, &xpFactory)) {
         // Fall back to src-over
         // return false here?
         xpFactory = GrPorterDuffXPFactory::Create(SkXfermode::kSrcOver_Mode);
     }
     SkASSERT(xpFactory);
     grPaint->setXPFactory(xpFactory)->unref();
 
     //set the color of the paint to the one of the parameter
     grPaint->setColor(paintColor);
 
@@ skipping 63 matching lines @@
         if (fp) {
             grPaint->addColorProcessor(fp)->unref();
             constantColor = false;
         }
     }
 
     // The grcolor is automatically set when calling asFragmentProcessor.
     // If the shader can be seen as an effect it returns true and adds its effect to the grpaint.
     return SkPaint2GrPaintNoShader(context, rt, skPaint, paintColor, constantColor, grPaint);
 }