Bug 1230415 - Use DrawTarget instead of gfxContext in PaintBorderWithStyleBorder(). r=roc.

--HG--
extra : rebase_source : 06da7ab06a3c0ea7c0141251857552abc26747b3

layout/base/nsCSSRendering.cpp

@@ -736,8 +736,7 @@ nsCSSRendering::PaintBorderWithStyleBorder(nsPresContext* aPresContext,
      joinedBorderArea.width, joinedBorderArea.height);
 
   // start drawing
-  gfxContext* ctx = aRenderingContext.ThebesContext();
-  ctx->Save();
+  bool needToPopClip = false;
 
   if (::IsBoxDecorationSlice(aStyleBorder)) {
     if (joinedBorderArea.IsEqualEdges(aBorderArea)) {
@@ -746,10 +745,11 @@ nsCSSRendering::PaintBorderWithStyleBorder(nsPresContext* aPresContext,
     } else {
       // We're drawing borders around the joined continuation boxes so we need
       // to clip that to the slice that we want for this frame.
-      aRenderingContext.ThebesContext()->
-        Clip(NSRectToSnappedRect(aBorderArea,
-                                 aForFrame->PresContext()->AppUnitsPerDevPixel(),
-                                 aDrawTarget));
+      aDrawTarget.PushClipRect(
+        NSRectToSnappedRect(aBorderArea,
+                            aForFrame->PresContext()->AppUnitsPerDevPixel(),
+                            aDrawTarget));
+      needToPopClip = true;
     }
   } else {
     MOZ_ASSERT(joinedBorderArea.IsEqualEdges(aBorderArea),
@@ -803,7 +803,9 @@ nsCSSRendering::PaintBorderWithStyleBorder(nsPresContext* aPresContext,
                          bgColor);
   br.DrawBorders();
 
-  ctx->Restore();
+  if (needToPopClip) {
+    aDrawTarget.PopClip();
+  }
 
   PrintAsStringNewline();