commit c88683283754bb086d4b5322b2579b9a9fd79254
author robertphillips@google.com <robertphillips@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81> Thu Sep 05 16:39:03 2013 +0000
committer robertphillips@google.com <robertphillips@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81> Thu Sep 05 16:39:03 2013 +0000
tree 59b8cd97fda1add15e3477ce2f3b61943da5c7d2
parent 1b338b8c2d69af115f51c10e38c9240ca8af9cf0

Add test to exercise extreme blur sigmas

https://codereview.chromium.org/23530039/



git-svn-id: http://skia.googlecode.com/svn/trunk/src@11099 2bbb7eff-a529-9590-31e7-b0007b416f81

effects/SkBlurMask.cpp

diff --git a/effects/SkBlurMask.cpp b/effects/SkBlurMask.cpp
index 134fef6..d279880 100644
--- a/effects/SkBlurMask.cpp
+++ b/effects/SkBlurMask.cpp
@@ -873,7 +873,7 @@
 
     float variance = sigma * sigma;
 
-    int windowSize = SkScalarCeil(sigma*4);
+    int windowSize = SkScalarCeil(sigma*6);
     // round window size up to nearest odd number
     windowSize |= 1;
 
@@ -885,7 +885,7 @@
 
     float windowSum = 1;
     for (int x = 1 ; x <= halfWindow ; ++x) {
-        float gaussian = expf(-x*x / variance);
+        float gaussian = expf(-x*x / (2*variance));
         gaussWindow[halfWindow + x] = gaussWindow[halfWindow-x] = gaussian;
         windowSum += 2*gaussian;
     }