Don't make dst copies when color stage requires dst but color writes are disabled.

src/gpu/GrContext.cpp

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "GrContext.h"
@@ skipping 955 matching lines @@
 
 ///////////////////////////////////////////////////////////////////////////////
 
 void GrContext::drawRRect(const GrPaint& paint,
                           const SkRRect& rect,
                           const SkStrokeRec& stroke) {
 
     GrDrawTarget* target = this->prepareToDraw(&paint, BUFFERED_DRAW);
     GrDrawState::AutoStageDisable atr(fDrawState);
 
-    bool prAA = paint.isAntiAlias() && !this->getRenderTarget()->isMultisampled();
+    bool useAA = paint.isAntiAlias() &&
+                 !this->getRenderTarget()->isMultisampled() &&
+                 !disable_coverage_aa_for_blend(target);
 
-    if (!fOvalRenderer->drawSimpleRRect(target, this, prAA, rect, stroke)) {
+    if (!fOvalRenderer->drawSimpleRRect(target, this, useAA, rect, stroke)) {
         SkPath path;
         path.addRRect(rect);
-        this->internalDrawPath(target, prAA, path, stroke);
+        this->internalDrawPath(target, useAA, path, stroke);
     }
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 void GrContext::drawOval(const GrPaint& paint,
                          const GrRect& oval,
                          const SkStrokeRec& stroke) {
 
     GrDrawTarget* target = this->prepareToDraw(&paint, BUFFERED_DRAW);
     GrDrawState::AutoStageDisable atr(fDrawState);
 
-    bool useAA = paint.isAntiAlias() && !this->getRenderTarget()->isMultisampled();
+    bool useAA = paint.isAntiAlias() &&
+                 !this->getRenderTarget()->isMultisampled() &&
+                 !disable_coverage_aa_for_blend(target);
 
     if (!fOvalRenderer->drawOval(target, this, useAA, oval, stroke)) {
         SkPath path;
         path.addOval(oval);
         this->internalDrawPath(target, useAA, path, stroke);
     }
 }
 
 void GrContext::drawPath(const GrPaint& paint, const SkPath& path, const SkStrokeRec& stroke) {
 
@@ skipping 795 matching lines @@
         return srcTexture;
     }
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 #if GR_CACHE_STATS
 void GrContext::printCacheStats() const {
     fTextureCache->printStats();
 }
 #endif