Optimize CSS box-shadow performance

bench/BlurRectBench.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Benchmark.h"
 #include "SkBlurMask.h"
 #include "SkCanvas.h"
@@ skipping 74 matching lines @@
             name.printf("blurrect_direct_%d", SkScalarRoundToInt(rad));
         }
 
         this->setName(name);
     }
 protected:
     virtual void makeBlurryRect(const SkRect& r) SK_OVERRIDE {
         SkMask mask;
         SkBlurMask::BlurRect(SkBlurMask::ConvertRadiusToSigma(this->radius()),
                              &mask, r, kNormal_SkBlurStyle);
-        SkMask::FreeImage(mask.fImage);
     }
 private:
     typedef BlurRectBench INHERITED;
 };
 
 class BlurRectSeparableBench: public BlurRectBench {
 
 public:
     BlurRectSeparableBench(SkScalar rad) : INHERITED(rad) {
         fSrcMask.fImage = NULL;
@@ skipping 34 matching lines @@
         this->setName(name);
     }
 
 protected:
 
     virtual void makeBlurryRect(const SkRect&) SK_OVERRIDE {
         SkMask mask;
         mask.fImage = NULL;
         SkBlurMask::BoxBlur(&mask, fSrcMask, SkBlurMask::ConvertRadiusToSigma(this->radius()),
                             kNormal_SkBlurStyle, kHigh_SkBlurQuality);
-        SkMask::FreeImage(mask.fImage);
     }
 private:
     typedef BlurRectSeparableBench INHERITED;
 };
 
 class BlurRectGaussianBench: public BlurRectSeparableBench {
 public:
     BlurRectGaussianBench(SkScalar rad) : INHERITED(rad) {
         SkString name;
 
@@ skipping 58 matching lines @@
 DEF_BENCH(return new BlurRectGaussianBench(SkIntToScalar(12));)
 DEF_BENCH(return new BlurRectGaussianBench(SkIntToScalar(13));)
 DEF_BENCH(return new BlurRectGaussianBench(SkIntToScalar(14));)
 DEF_BENCH(return new BlurRectGaussianBench(SkIntToScalar(15));)
 DEF_BENCH(return new BlurRectGaussianBench(SkIntToScalar(16));)
 DEF_BENCH(return new BlurRectGaussianBench(SkIntToScalar(17));)
 DEF_BENCH(return new BlurRectGaussianBench(SkIntToScalar(18));)
 DEF_BENCH(return new BlurRectGaussianBench(SkIntToScalar(19));)
 DEF_BENCH(return new BlurRectGaussianBench(SkIntToScalar(20));)
 #endif