Bug 1301459 - In nsSVGMaskFrame::GetMaskForMaskedFrame, create surface by Factory::CreateDataSourceSurface. r=mstange

---
 layout/svg/nsSVGMaskFrame.cpp | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

layout/svg/nsSVGMaskFrame.cpp

@@ -283,17 +283,11 @@ nsSVGMaskFrame::GetMaskForMaskedFrame(gfxContext* aContext,
   }
 
   // Create alpha channel mask for output
-  RefPtr<DrawTarget> destMaskDT =
-    Factory::CreateDrawTarget(BackendType::CAIRO, maskSurfaceSize,
-                              SurfaceFormat::A8);
-  if (!destMaskDT) {
+  RefPtr<DataSourceSurface> destMaskSurface =
+    Factory::CreateDataSourceSurface(maskSurfaceSize, SurfaceFormat::A8);
+  if (!destMaskSurface) {
     return nullptr;
   }
-  RefPtr<SourceSurface> destMaskSnapshot = destMaskDT->Snapshot();
-  if (!destMaskSnapshot) {
-    return nullptr;
-  }
-  RefPtr<DataSourceSurface> destMaskSurface = destMaskSnapshot->GetDataSurface();
   DataSourceSurface::MappedSurface destMap;
   if (!destMaskSurface->Map(DataSourceSurface::MapType::WRITE, &destMap)) {
     return nullptr;