SkBlurImageFilter returns input when sigma = 0

bench/BlurImageFilterBench.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 "SkBlurImageFilter.h"
 #include "SkOffsetImageFilter.h"
@@ skipping 62 matching lines @@
                                                 SkIntToScalar(fCheckerboard.height()));
         const SkImageFilter::CropRect cropRect(bmpRect.makeInset(10.f, 10.f));
         const SkImageFilter::CropRect cropRectLarge(bmpRect);
         SkAutoTUnref<SkImageFilter> noOpCropped(SkOffsetImageFilter::Create(0, 0, nullptr,
                                                 &cropRect));
 
         SkImageFilter* input = fIsExpanded ? noOpCropped.get() : nullptr;
 
         const SkImageFilter::CropRect* crop =
             fIsExpanded ? &cropRectLarge : fIsCropped ? &cropRect : nullptr;
-        paint.setImageFilter(SkBlurImageFilter::Create(fSigmaX, fSigmaY, input, crop))->unref();
+        SkAutoTUnref<SkImageFilter> blur(SkBlurImageFilter::Create(fSigmaX, fSigmaY, input, crop));
+        paint.setImageFilter(blur);
 
         for (int i = 0; i < loops; i++) {
             canvas->drawBitmap(fCheckerboard, kX, kY, &paint);
         }
     }
 
 private:
     void make_checkerboard() {
         const int w = fIsSmall ? FILTER_WIDTH_SMALL : FILTER_WIDTH_LARGE;
         const int h = fIsSmall ? FILTER_HEIGHT_LARGE : FILTER_HEIGHT_LARGE;
@@ skipping 58 matching lines @@
 DEF_BENCH(return new BlurImageFilterBench(0, BLUR_SIGMA_LARGE, false, true, true);)
 DEF_BENCH(return new BlurImageFilterBench(0, BLUR_SIGMA_SMALL, false, true, true);)
 DEF_BENCH(return new BlurImageFilterBench(BLUR_SIGMA_MINI, BLUR_SIGMA_MINI, true, true, true);)
 DEF_BENCH(return new BlurImageFilterBench(BLUR_SIGMA_MINI, BLUR_SIGMA_MINI, false, true, true);)
 DEF_BENCH(return new BlurImageFilterBench(BLUR_SIGMA_SMALL, BLUR_SIGMA_SMALL, true, true, true);)
 DEF_BENCH(return new BlurImageFilterBench(BLUR_SIGMA_SMALL, BLUR_SIGMA_SMALL, false, true, true);)
 DEF_BENCH(return new BlurImageFilterBench(BLUR_SIGMA_LARGE, BLUR_SIGMA_LARGE, true, true, true);)
 DEF_BENCH(return new BlurImageFilterBench(BLUR_SIGMA_LARGE, BLUR_SIGMA_LARGE, false, true, true);)
 DEF_BENCH(return new BlurImageFilterBench(BLUR_SIGMA_HUGE, BLUR_SIGMA_HUGE, true, true, true);)
 DEF_BENCH(return new BlurImageFilterBench(BLUR_SIGMA_HUGE, BLUR_SIGMA_HUGE, false, true, true);)