Pass ctm when performing image filtering in GPU backend.

src/effects/SkBlurMaskFilter.cpp

Index: src/effects/SkBlurMaskFilter.cpp
diff --git a/src/effects/SkBlurMaskFilter.cpp b/src/effects/SkBlurMaskFilter.cpp
index d2c43d719bcd707ddd58a3adacfe27b6a1015476..81eaa29a6db2a71a63cd5c1706b55695c26b7c16 100644
--- a/src/effects/SkBlurMaskFilter.cpp
+++ b/src/effects/SkBlurMaskFilter.cpp
@@ -38,9 +38,10 @@ public:
                                   const SkMatrix& ctm,
                                   SkRect* maskRect) const SK_OVERRIDE;
     virtual bool filterMaskGPU(GrTexture* src,
+                               const SkMatrix& ctm,
                                const SkRect& maskRect,
                                GrTexture** result,
-                               bool canOverwriteSrc) const;
+                               bool canOverwriteSrc) const SK_OVERRIDE;
 #endif
 
     virtual void computeFastBounds(const SkRect&, SkRect*) const SK_OVERRIDE;
@@ -540,15 +541,17 @@ bool SkBlurMaskFilterImpl::canFilterMaskGPU(const SkRect& srcBounds,
 }
 
 bool SkBlurMaskFilterImpl::filterMaskGPU(GrTexture* src,

[robertphillips, 2014/01/08 20:15:18]

Move the following lines right 1 space?

[bsalomon, 2014/01/08 21:38:36]

Done.

-                                         const SkRect& maskRect,
-                                         GrTexture** result,
-                                         bool canOverwriteSrc) const {
+                                        const SkMatrix& matrix,
+                                        const SkRect& maskRect,
+                                        GrTexture** result,
+                                        bool canOverwriteSrc) const {
     SkRect clipRect = SkRect::MakeWH(maskRect.width(), maskRect.height());
 
     GrContext* context = src->getContext();
 
     GrContext::AutoWideOpenIdentityDraw awo(context, NULL);
 
+    // FIXME: This isn't the right matrix.
     SkScalar xformedSigma = this->computeXformedSigma(context->getMatrix());
     SkASSERT(xformedSigma > 0);