SkBlurImageFilter returns input when sigma = 0

In the current implementation, a blur filter is always created even in the
case when sigma.fX == 0 && sigma.fY == 0. This CL makes the blur filter
return input in this case.

BUG=568393

Review URL: https://codereview.chromium.org/1518643002

1 files changed, 2 insertions, 1 deletions

diff --git a/bench/BlurImageFilterBench.cpp b/bench/BlurImageFilterBench.cpp
index 7ed600632a..f0a7a8eea0 100644
--- a/bench/BlurImageFilterBench.cpp
+++ b/bench/BlurImageFilterBench.cpp
@@ -80,7 +80,8 @@ protected:
 
         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);