Add XferProcessor factory in GrPaint and GrDrawState.

src/gpu/GrPaint.cpp

 
 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrPaint.h"
 
 #include "GrBlend.h"
 #include "GrProcOptInfo.h"
+#include "effects/GrPorterDuffXferProcessor.h"
 #include "effects/GrSimpleTextureEffect.h"
 
 void GrPaint::addColorTextureProcessor(GrTexture* texture, const SkMatrix& matrix) {
     this->addColorProcessor(GrSimpleTextureEffect::Create(texture, matrix))->unref();
 }
 
 void GrPaint::addCoverageTextureProcessor(GrTexture* texture, const SkMatrix& matrix) {
     this->addCoverageProcessor(GrSimpleTextureEffect::Create(texture, matrix))->unref();
 }
 
@@ skipping 18 matching lines @@
     uint32_t colorComps = 0;
     if (this->getOpaqueAndKnownColor(&tempColor, &colorComps)) {
         if (kRGBA_GrColorComponentFlags == colorComps) {
             *color = tempColor;
             return true;
         }
     }
     return false;
 }
 
+void GrPaint::resetStages() {
+    fColorStages.reset();
+    fCoverageStages.reset();
+    fXPFactory.reset(GrPorterDuffXPFactory::Create(kOne_GrBlendCoeff,
+                                                   kZero_GrBlendCoeff));
+}
+
 bool GrPaint::getOpaqueAndKnownColor(GrColor* solidColor,
                                      uint32_t* solidColorKnownComponents) const {
 
     // TODO: Share this implementation with GrDrawState
     
     GrProcOptInfo coverageProcInfo;
     coverageProcInfo.calcWithInitialValues(fCoverageStages.begin(), this->numCoverageStages(),
                                            0xFFFFFFFF, kRGBA_GrColorComponentFlags, true);
 
     if (!coverageProcInfo.isSolidWhite()) {
@@ skipping 46 matching lines @@
                 case kIConstA_GrBlendCoeff:
                     *solidColorKnownComponents = 0;
                     break;
             }
         } else {
             solidColorKnownComponents = 0;
         }
     }
     return opaque;
 }
+