first attempt to plumb fast blur code into skia mask filter

src/effects/SkBlurMask.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 SkBlurMask_DEFINED
@@ skipping 12 matching lines @@
         kStyleCount
     };
 
     enum Quality {
         kLow_Quality,   //!< box blur
         kHigh_Quality   //!< three pass box blur (similar to gaussian)
     };
 
     static bool BlurRect(SkMask *dst, const SkRect &src,
                          SkScalar radius, Style style,
-                         SkIPoint *margin = NULL);
+                         SkIPoint *margin = NULL, bool perform_blur=true);
     static bool Blur(SkMask* dst, const SkMask& src,
                      SkScalar radius, Style style, Quality quality,
                      SkIPoint* margin = NULL);
     static bool BlurSeparable(SkMask* dst, const SkMask& src,
                               SkScalar radius, Style style, Quality quality,
                               SkIPoint* margin = NULL);
 
 
     // the "ground truth" blur does a gaussian convolution; it's slow
     // but useful for comparison purposes.
 
     static bool BlurGroundTruth(SkMask* dst, const SkMask& src,
                            SkScalar provided_radius, Style style,
                            SkIPoint* margin = NULL);
 
 private:
     static bool Blur(SkMask* dst, const SkMask& src,
                      SkScalar radius, Style style, Quality quality,
                      SkIPoint* margin, bool separable);
 };
 
 #endif