Fix quickReject computation for blurs

src/gpu/SkGpuDevice.cpp

Index: src/gpu/SkGpuDevice.cpp
===================================================================
--- src/gpu/SkGpuDevice.cpp	(revision 9604)
+++ src/gpu/SkGpuDevice.cpp	(working copy)
@@ -47,18 +47,6 @@
     kXfermodeEffectIdx = 2,
 };
 
-#define MAX_BLUR_SIGMA 4.0f
-// FIXME:  This value comes from from SkBlurMaskFilter.cpp.
-// Should probably be put in a common header someplace.
-#define MAX_BLUR_RADIUS SkIntToScalar(128)
-// This constant approximates the scaling done in the software path's
-// "high quality" mode, in SkBlurMask::Blur() (1 / sqrt(3)).
-// IMHO, it actually should be 1:  we blur "less" than we should do
-// according to the CSS and canvas specs, simply because Safari does the same.
-// Firefox used to do the same too, until 4.0 where they fixed it.  So at some
-// point we should probably get rid of these scaling constants and rebaseline
-// all the blur tests.
-#define BLUR_SIGMA_SCALE 0.6f
 // This constant represents the screen alignment criterion in texels for
 // requiring texture domain clamping to prevent color bleeding when drawing
 // a sub region of a larger source image.
@@ -798,7 +786,7 @@
     }
     SkScalar radius = info.fIgnoreTransform ? info.fRadius
                                             : context->getMatrix().mapRadius(info.fRadius);
-    radius = SkMinScalar(radius, MAX_BLUR_RADIUS);
+    radius = SkMinScalar(radius, info.fMaxRadius);
     if (radius <= 0) {
         return false;
     }
@@ -808,7 +796,7 @@
         return false;
     }
 
-    float sigma = SkScalarToFloat(radius) * BLUR_SIGMA_SCALE;
+    float sigma = SkScalarToFloat(radius) * info.fSigmaFraction;
     float sigma3 = sigma * 3.0f;
 
     SkRect clipRect;