Implement correct clipping for image filters.

include/core/SkCanvas.h

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkCanvas_DEFINED
@@ skipping 1009 matching lines @@
 
 protected:
     // Returns the canvas to be used by DrawIter. Default implementation
     // returns this. Subclasses that encapsulate an indirect canvas may
     // need to overload this method. The impl must keep track of this, as it
     // is not released or deleted by the caller.
     virtual SkCanvas* canvasForDrawIter();
 
     // Clip rectangle bounds. Called internally by saveLayer.
     // returns false if the entire rectangle is entirely clipped out
+    // If non-NULL, The imageFilter parameter will be used to expand the clip
+    // and offscreen bounds for any margin required by the filter DAG.
     bool clipRectBounds(const SkRect* bounds, SaveFlags flags,
-                        SkIRect* intersection);
+                        SkIRect* intersection,
+                        const SkImageFilter* imageFilter = NULL);
 
     // Called by child classes that override clipPath and clipRRect to only
     // track fast conservative clip bounds, rather than exact clips.
     bool updateClipConservativelyUsingBounds(const SkRect&, SkRegion::Op,
                                              bool inverseFilled);
 
     // notify our surface (if we have one) that we are about to draw, so it
     // can perform copy-on-write or invalidate any cached images
     void predrawNotify();
 
@@ skipping 155 matching lines @@
             fCanvas->endCommentGroup();
         }
     }
 
 private:
     SkCanvas* fCanvas;
 };
 #define SkAutoCommentBlock(...) SK_REQUIRE_LOCAL_VAR(SkAutoCommentBlock)
 
 #endif