diff -r 000000000000 -r 6474c204b198 layout/generic/nsHTMLCanvasFrame.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/generic/nsHTMLCanvasFrame.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,101 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* rendering object for the HTML <canvas> element */
+
+#ifndef nsHTMLCanvasFrame_h___
+#define nsHTMLCanvasFrame_h___
+
+#include "mozilla/Attributes.h"
+#include "nsContainerFrame.h"
+#include "FrameLayerBuilder.h"
+
+namespace mozilla {
+namespace layers {
+class Layer;
+class LayerManager;
+}
+}
+
+class nsPresContext;
+class nsDisplayItem;
+class nsAString;
+
+nsIFrame* NS_NewHTMLCanvasFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
+
+class nsHTMLCanvasFrame : public nsContainerFrame
+{
+public:
+  typedef mozilla::layers::Layer Layer;
+  typedef mozilla::layers::LayerManager LayerManager;
+  typedef mozilla::ContainerLayerParameters ContainerLayerParameters;
+
+  NS_DECL_QUERYFRAME_TARGET(nsHTMLCanvasFrame)
+  NS_DECL_QUERYFRAME
+  NS_DECL_FRAMEARENA_HELPERS
+
+  nsHTMLCanvasFrame(nsStyleContext* aContext) : nsContainerFrame(aContext) {}
+
+  virtual void Init(nsIContent* aContent,
+                    nsIFrame*   aParent,
+                    nsIFrame*   aPrevInFlow) MOZ_OVERRIDE;
+
+  virtual void BuildDisplayList(nsDisplayListBuilder*   aBuilder,
+                                const nsRect&           aDirtyRect,
+                                const nsDisplayListSet& aLists) MOZ_OVERRIDE;
+
+  already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
+                                     LayerManager* aManager,
+                                     nsDisplayItem* aItem,
+                                     const ContainerLayerParameters& aContainerParameters);
+
+  /* get the size of the canvas's image */
+  nsIntSize GetCanvasSize();
+
+  virtual nscoord GetMinWidth(nsRenderingContext *aRenderingContext) MOZ_OVERRIDE;
+  virtual nscoord GetPrefWidth(nsRenderingContext *aRenderingContext) MOZ_OVERRIDE;
+  virtual nsSize GetIntrinsicRatio() MOZ_OVERRIDE;
+
+  virtual nsSize ComputeSize(nsRenderingContext *aRenderingContext,
+                             nsSize aCBSize, nscoord aAvailableWidth,
+                             nsSize aMargin, nsSize aBorder, nsSize aPadding,
+                             uint32_t aFlags) MOZ_OVERRIDE;
+
+  virtual nsresult Reflow(nsPresContext*           aPresContext,
+                          nsHTMLReflowMetrics&     aDesiredSize,
+                          const nsHTMLReflowState& aReflowState,
+                          nsReflowStatus&          aStatus) MOZ_OVERRIDE;
+
+  nsRect GetInnerArea() const;
+
+#ifdef ACCESSIBILITY
+  virtual mozilla::a11y::AccType AccessibleType() MOZ_OVERRIDE;
+#endif
+
+  virtual nsIAtom* GetType() const MOZ_OVERRIDE;
+
+  virtual bool IsFrameOfType(uint32_t aFlags) const MOZ_OVERRIDE
+  {
+    return nsSplittableFrame::IsFrameOfType(aFlags & ~(nsIFrame::eReplaced));
+  }
+
+#ifdef DEBUG_FRAME_DUMP
+  virtual nsresult GetFrameName(nsAString& aResult) const MOZ_OVERRIDE;
+#endif
+
+  // Inserted child content gets its frames parented by our child block
+  virtual nsIFrame* GetContentInsertionFrame() MOZ_OVERRIDE {
+    return GetFirstPrincipalChild()->GetContentInsertionFrame();
+  }
+
+protected:
+  virtual ~nsHTMLCanvasFrame();
+
+  nscoord GetContinuationOffset(nscoord* aWidth = 0) const;
+
+  nsMargin mBorderPadding;
+};
+
+#endif /* nsHTMLCanvasFrame_h___ */