Fast blurred rectangles on GPU

src/gpu/SkGpuDevice.cpp

Index: src/gpu/SkGpuDevice.cpp
diff --git a/src/gpu/SkGpuDevice.cpp b/src/gpu/SkGpuDevice.cpp
index 5ba174cafcc53e9f483b7844c1f1d98b173629ac..adc8599bf7d7aff0a581047e43c9c1edea51f2b0 100644
--- a/src/gpu/SkGpuDevice.cpp
+++ b/src/gpu/SkGpuDevice.cpp
@@ -919,7 +919,7 @@ void SkGpuDevice::drawPath(const SkDraw& draw, const SkPath& origSrcPath,
 
         // transform the path into device space
         pathPtr->transform(fContext->getMatrix(), devPathPtr);
-
+        
         SkRect maskRect;
         if (paint.getMaskFilter()->canFilterMaskGPU(devPathPtr->getBounds(),
                                                     draw.fClip->getBounds(),
@@ -939,6 +939,13 @@ void SkGpuDevice::drawPath(const SkDraw& draw, const SkPath& origSrcPath,
                 // nothing to draw
                 return;
             }
+            
+            if (paint.getMaskFilter()->directFilterMaskGPU(fContext, &grPaint,
+                                                           SkStrokeRec(paint), *devPathPtr)) {
+                // the mask filter was able to draw itself directly, so there's nothing
+                // left to do.
+                return;
+            }
 
             GrAutoScratchTexture mask;