Bug 885016. Avoid using uninitiated extend in gfxPattern. r=bas

This changes gfxPattern to use GraphicsExtend. All of the inputs and outputs
are GraphicsExtend so there's no point storing it in a type of ExtendMode. We
also intialize gfxPattern to EXTEND_NONE when constructing it for Azure.

--HG--
extra : rebase_source : 576a620b45d5222a5548dd79520537d52ed5659e

gfx/thebes/gfxPattern.cpp

@@ -55,6 +55,7 @@ gfxPattern::gfxPattern(SourceSurface *aSurface, const Matrix &aTransform)
   , mGfxPattern(NULL)
   , mSourceSurface(aSurface)
   , mTransform(aTransform)
+  , mExtend(EXTEND_NONE)
 {
 }
 
@@ -323,7 +324,7 @@ gfxPattern::SetExtend(GraphicsExtend extend)
   } else {
     // This is always a surface pattern and will default to EXTEND_PAD
     // for EXTEND_PAD_EDGE.
-    mExtend = ToExtendMode(extend);
+    mExtend = extend;
   }
 }
 
@@ -358,7 +359,7 @@ gfxPattern::Extend() const
   if (mPattern) {
     return (GraphicsExtend)cairo_pattern_get_extend(mPattern);
   } else {
-    return ThebesExtend(mExtend);
+    return mExtend;
   }
 }
 

gfx/thebes/gfxPattern.h

@@ -136,7 +136,7 @@ protected:
     mozilla::RefPtr<mozilla::gfx::SourceSurface> mSourceSurface;
     mozilla::gfx::Matrix mTransform;
     mozilla::RefPtr<mozilla::gfx::GradientStops> mStops;
-    mozilla::gfx::ExtendMode mExtend;
+    GraphicsExtend mExtend;
     mozilla::gfx::Filter mFilter;
 };