Trim the copy of the dst made for dst-reading effects using the clip and dev-bounds of draw.

src/gpu/GrDrawTarget.h

 
 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef GrDrawTarget_DEFINED
@@ skipping 636 matching lines @@
         // shifts the start vertex
         void adjustStartVertex(int vertexOffset);
         // shifts the start index
         void adjustStartIndex(int indexOffset);
 
         void setDevBounds(const SkRect& bounds) {
             fDevBoundsStorage = bounds;
             fDevBounds = &fDevBoundsStorage;
         }
         const SkRect* getDevBounds() const { return fDevBounds; }
+        
+        bool getDevIBounds(SkIRect* bounds) const {
+            if (NULL != fDevBounds) {
+                fDevBounds->roundOut(bounds);
+                return true;
+            } else {
+                return false;
+            }
+        }
 
         // NULL if no copy of the dst is needed for the draw.
         const GrDeviceCoordTexture* getDstCopy() const {
             if (NULL != fDstCopy.texture()) {
                 return &fDstCopy;
             } else {
                 return NULL;
             }
         }
 
@@ skipping 69 matching lines @@
     const GrClipData*                                               fClip;
     GrDrawState*                                                    fDrawState;
     GrDrawState                                                     fDefaultDrawState;
     // The context owns us, not vice-versa, so this ptr is not ref'ed by DrawTarget.
     GrContext*                                                      fContext;
 
     typedef GrRefCnt INHERITED;
 };
 
 #endif