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       1             : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* This Source Code Form is subject to the terms of the Mozilla Public
       3             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       4             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       5             : 
       6             : /* rendering object for the HTML <canvas> element */
       7             : 
       8             : #ifndef nsHTMLCanvasFrame_h___
       9             : #define nsHTMLCanvasFrame_h___
      10             : 
      11             : #include "mozilla/Attributes.h"
      12             : #include "nsContainerFrame.h"
      13             : #include "FrameLayerBuilder.h"
      14             : 
      15             : namespace mozilla {
      16             : namespace layers {
      17             : class Layer;
      18             : class LayerManager;
      19             : } // namespace layers
      20             : } // namespace mozilla
      21             : 
      22             : class nsPresContext;
      23             : class nsDisplayItem;
      24             : class nsAString;
      25             : 
      26             : nsIFrame* NS_NewHTMLCanvasFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
      27             : 
      28             : class nsHTMLCanvasFrame final : public nsContainerFrame
      29             : {
      30             : public:
      31             :   typedef mozilla::layers::Layer Layer;
      32             :   typedef mozilla::layers::LayerManager LayerManager;
      33             :   typedef mozilla::ContainerLayerParameters ContainerLayerParameters;
      34             : 
      35             :   NS_DECL_QUERYFRAME
      36           0 :   NS_DECL_FRAMEARENA_HELPERS(nsHTMLCanvasFrame)
      37             : 
      38           0 :   explicit nsHTMLCanvasFrame(nsStyleContext* aContext)
      39           0 :     : nsContainerFrame(aContext, kClassID)
      40           0 :     , mBorderPadding(GetWritingMode())
      41           0 :   {}
      42             : 
      43             :   virtual void Init(nsIContent*       aContent,
      44             :                     nsContainerFrame* aParent,
      45             :                     nsIFrame*         aPrevInFlow) override;
      46             : 
      47             :   virtual void BuildDisplayList(nsDisplayListBuilder*   aBuilder,
      48             :                                 const nsRect&           aDirtyRect,
      49             :                                 const nsDisplayListSet& aLists) override;
      50             : 
      51             :   already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
      52             :                                      LayerManager* aManager,
      53             :                                      nsDisplayItem* aItem,
      54             :                                      const ContainerLayerParameters& aContainerParameters);
      55             : 
      56             :   /* get the size of the canvas's image */
      57             :   nsIntSize GetCanvasSize();
      58             : 
      59             :   virtual nscoord GetMinISize(gfxContext *aRenderingContext) override;
      60             :   virtual nscoord GetPrefISize(gfxContext *aRenderingContext) override;
      61             :   virtual mozilla::IntrinsicSize GetIntrinsicSize() override;
      62             :   virtual nsSize GetIntrinsicRatio() override;
      63             : 
      64             :   virtual mozilla::LogicalSize
      65             :   ComputeSize(gfxContext *aRenderingContext,
      66             :               mozilla::WritingMode aWritingMode,
      67             :               const mozilla::LogicalSize& aCBSize,
      68             :               nscoord aAvailableISize,
      69             :               const mozilla::LogicalSize& aMargin,
      70             :               const mozilla::LogicalSize& aBorder,
      71             :               const mozilla::LogicalSize& aPadding,
      72             :               ComputeSizeFlags aFlags) override;
      73             : 
      74             :   virtual void Reflow(nsPresContext*           aPresContext,
      75             :                       ReflowOutput&     aDesiredSize,
      76             :                       const ReflowInput& aReflowInput,
      77             :                       nsReflowStatus&          aStatus) override;
      78             : 
      79             :   nsRect GetInnerArea() const;
      80             : 
      81             : #ifdef ACCESSIBILITY
      82             :   virtual mozilla::a11y::AccType AccessibleType() override;
      83             : #endif
      84             : 
      85           0 :   virtual bool IsFrameOfType(uint32_t aFlags) const override
      86             :   {
      87           0 :     return nsSplittableFrame::IsFrameOfType(aFlags &
      88           0 :       ~(nsIFrame::eReplaced | nsIFrame::eReplacedSizing));
      89             :   }
      90             : 
      91             : #ifdef DEBUG_FRAME_DUMP
      92             :   virtual nsresult GetFrameName(nsAString& aResult) const override;
      93             : #endif
      94             : 
      95             :   // Inserted child content gets its frames parented by our child block
      96           0 :   virtual nsContainerFrame* GetContentInsertionFrame() override {
      97           0 :     return PrincipalChildList().FirstChild()->GetContentInsertionFrame();
      98             :   }
      99             : 
     100             :   // Return the ::-moz-html-canvas-content anonymous box.
     101             :   void AppendDirectlyOwnedAnonBoxes(nsTArray<OwnedAnonBox>& aResult) override;
     102             : 
     103             : protected:
     104             :   virtual ~nsHTMLCanvasFrame();
     105             : 
     106             :   nscoord GetContinuationOffset(nscoord* aWidth = 0) const;
     107             : 
     108             :   mozilla::LogicalMargin mBorderPadding;
     109             : };
     110             : 
     111             : #endif /* nsHTMLCanvasFrame_h___ */