Fast blurred rectangles on GPU

include/core/SkMaskFilter.h

Index: include/core/SkMaskFilter.h
diff --git a/include/core/SkMaskFilter.h b/include/core/SkMaskFilter.h
index f4448ddddb453e9502f075f928303a0c9fb428f0..6a63d928fd1ded35e893a48e8bcfc8645bcac284 100644
--- a/include/core/SkMaskFilter.h
+++ b/include/core/SkMaskFilter.h
@@ -15,6 +15,7 @@
 #include "SkPaint.h"
 
 class GrContext;
+class GrPaint;
 class SkBitmap;
 class SkBlitter;
 class SkBounder;
@@ -22,6 +23,7 @@ class SkMatrix;
 class SkPath;
 class SkRasterClip;
 class SkRRect;
+class SkStrokeRec;
 
 /** \class SkMaskFilter
 
@@ -89,6 +91,15 @@ public:
                                   SkRect* maskRect) const;
 
     /**
+     *  Try to directly render the mask filter into the target.  Returns
+     *  true if drawing was successful.
+     */
+    virtual bool directFilterMaskGPU(GrContext* context,
+                                     GrPaint* grp,
+                                     const SkStrokeRec& strokeRec,
+                                     const SkPath* path) const;
+
+    /**
      *  Perform this mask filter on the GPU.  This is most often used for
      *  multi-pass effects, where intermediate results must be rendered to
      *  textures.  For single-pass effects, use asNewEffect().  'src' is the