Remove quantization of device-space dest rect for Ganesh analytic rrect blurs

At least on Windows, this fixes a lot of the horrible banded blurs. AFAICT there is no good reason to quantize the device space rect passed to the GrRectBlurEffect.

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2262263002

Review-Url: https://codereview.chromium.org/2262263002

diff --git a/src/effects/SkBlurMaskFilter.cpp b/src/effects/SkBlurMaskFilter.cpp
index c044333..cbaed9b 100644 (file)
--- a/src/effects/SkBlurMaskFilter.cpp
+++ b/src/effects/SkBlurMaskFilter.cpp
@@ -1034,8 +1034,8 @@ bool SkBlurMaskFilterImpl::directFilterMaskGPU(GrTextureProvider* texProvider,
 
     SkRect rect;
     if (path.isRect(&rect)) {
-        int pad = SkScalarCeilToInt(6*xformedSigma)/2;
-        rect.outset(SkIntToScalar(pad), SkIntToScalar(pad));
+        SkScalar pad = 3.0f * xformedSigma;
+        rect.outset(pad, pad);
 
         fp = GrRectBlurEffect::Make(texProvider, rect, xformedSigma);
     } else if (path.isOval(&rect) && SkScalarNearlyEqual(rect.width(), rect.height())) {