Optimize CSS box-shadow performance

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
 #define SkBlurMask_DEFINED
 
 #include "SkBlurTypes.h"
+#include "SkCachedData.h"
 #include "SkShader.h"
 #include "SkMask.h"
 #include "SkRRect.h"
 
 class SkBlurMask {
 public:
-    static bool BlurRect(SkScalar sigma, SkMask *dst, const SkRect &src, SkBlurStyle,
-                         SkIPoint *margin = NULL,
+    static bool BlurRect(SkScalar sigma, SkMask *dst, SkCachedData** data, const SkRect &src,
+                         SkBlurStyle, SkIPoint *margin = NULL,
                          SkMask::CreateMode createMode =
                                                 SkMask::kComputeBoundsAndRenderImage_CreateMode);
-    static bool BlurRRect(SkScalar sigma, SkMask *dst, const SkRRect &src, SkBlurStyle,
-                         SkIPoint *margin = NULL,
+    static bool BlurRRect(SkScalar sigma, SkMask *dst, SkCachedData** data, const SkRRect &src,
+                         SkBlurStyle, SkIPoint *margin = NULL,
                          SkMask::CreateMode createMode =
                                                 SkMask::kComputeBoundsAndRenderImage_CreateMode);
 
     // forceQuality will prevent BoxBlur from falling back to the low quality approach when sigma
     // is very small -- this can be used predict the margin bump ahead of time without completely
     // replicating the internal logic.  This permits not only simpler caching of blurred results,
     // but also being able to predict precisely at what pixels the blurred profile of e.g. a
     // rectangle will lie.
 
-    static bool BoxBlur(SkMask* dst, const SkMask& src,
+    static bool BoxBlur(SkMask* dst, SkCachedData** data, const SkMask& src,
                         SkScalar sigma, SkBlurStyle style, SkBlurQuality quality,
                         SkIPoint* margin = NULL, bool force_quality=false);
 
     // the "ground truth" blur does a gaussian convolution; it's slow
     // but useful for comparison purposes.
     static bool BlurGroundTruth(SkScalar sigma, SkMask* dst, const SkMask& src, SkBlurStyle,
                                 SkIPoint* margin = NULL);
 
     // If radius > 0, return the corresponding sigma, else return 0
     static SkScalar ConvertRadiusToSigma(SkScalar radius);
@@ skipping 25 matching lines @@
         @param pixels Location to store the resulting pixel data; allocated and managed by caller
         @param profile Precomputed blur profile computed by ComputeBlurProfile above.
         @param width Size of the pixels array.
         @param sigma Standard deviation of the gaussian blur kernel used to compute the profile;
                      this implicitly gives the size of the pixels array.
     */
 
     static void ComputeBlurredScanline(uint8_t* pixels, const uint8_t* profile,
                                        unsigned int width, SkScalar sigma);
 
-
-
 };
 
 #endif