Image filters: optimize crop rect application

src/effects/SkMergeImageFilter.cpp

Index: src/effects/SkMergeImageFilter.cpp
diff --git a/src/effects/SkMergeImageFilter.cpp b/src/effects/SkMergeImageFilter.cpp
index 07b2c1cf3e9ef8de8309144c6c89c72407b8763c..7568dc7dc69134513e5237ddaf2d523cf5dfdea1 100755
--- a/src/effects/SkMergeImageFilter.cpp
+++ b/src/effects/SkMergeImageFilter.cpp
@@ -86,7 +86,7 @@ sk_sp<SkSpecialImage> SkMergeImageFilter::onFilterImage(SkSpecialImage* source,
     }
 
     // Apply the crop rect to the union of the inputs' bounds.

[robertphillips, 2016/04/01 19:58:08]

// add a comment about why this is 'false' 

?

[Stephen White, 2016/04/01 21:26:35]

Changed it to pass this->affectsTransparentBlack() instead.

-    this->getCropRect().applyTo(bounds, ctx.ctm(), &bounds);
+    this->getCropRect().applyTo(bounds, ctx.ctm(), false, &bounds);
     if (!bounds.intersect(ctx.clipBounds())) {
         return nullptr;
     }