Fix quickReject computation for blurs

src/effects/SkBlurMask.cpp

Index: src/effects/SkBlurMask.cpp
===================================================================
--- src/effects/SkBlurMask.cpp	(revision 9604)
+++ src/effects/SkBlurMask.cpp	(working copy)
@@ -11,15 +11,8 @@
 #include "SkMath.h"
 #include "SkTemplates.h"
 #include "SkEndian.h"
+#include "SkBlurMaskFilter.h"
 
-// scale factor for the blur radius to match the behavior of the all existing blur
-// code (both on the CPU and the GPU).  This magic constant is  1/sqrt(3).
-
-// TODO: get rid of this fudge factor and move any required fudging up into
-// the calling library
-
-#define kBlurRadiusFudgeFactor SkFloatToScalar( .57735f )
-
 #define UNROLL_SEPARABLE_LOOPS
 
 /**
@@ -495,7 +488,7 @@
     // to approximate a Gaussian blur
     int passCount = (kHigh_Quality == quality) ? 3 : 1;
     SkScalar passRadius = (kHigh_Quality == quality) ?
-                          SkScalarMul( radius, kBlurRadiusFudgeFactor):
+                          SkScalarMul( radius, SkBlurMaskFilter::kBlurRadiusFudgeFactor):
                           radius;
 
     int rx = SkScalarCeil(passRadius);
@@ -715,7 +708,7 @@
                           SkIPoint *margin, SkMask::CreateMode createMode) {
     int profile_size;
 
-    float radius = SkScalarToFloat(SkScalarMul(provided_radius, kBlurRadiusFudgeFactor));
+    float radius = SkScalarToFloat(SkScalarMul(provided_radius, SkBlurMaskFilter::kBlurRadiusFudgeFactor));
 
     // adjust blur radius to match interpretation from boxfilter code
     radius = (radius + .5f) * 2.f;
@@ -851,7 +844,7 @@
         return false;
     }
 
-    float radius = SkScalarToFloat(SkScalarMul(provided_radius, kBlurRadiusFudgeFactor));
+    float radius = SkScalarToFloat(SkScalarMul(provided_radius, SkBlurMaskFilter::kBlurRadiusFudgeFactor));
     float stddev = SkScalarToFloat(radius) /2.0f;
     float variance = stddev * stddev;