layout/generic/nsHTMLCanvasFrame.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 /* rendering object for the HTML <canvas> element */
   8
   9 #ifndef nsHTMLCanvasFrame_h___
  10 #define nsHTMLCanvasFrame_h___
  11
  12 #include "mozilla/Attributes.h"
  13 #include "nsContainerFrame.h"
  14 #include "nsStringFwd.h"
  15
  16 namespace mozilla {
  17 class PresShell;
  18 namespace layers {
  19 class CanvasRenderer;
  20 class Layer;
  21 class LayerManager;
  22 class WebRenderCanvasData;
  23 }  // namespace layers
  24 }  // namespace mozilla
  25
  26 class nsPresContext;
  27
  28 nsIFrame* NS_NewHTMLCanvasFrame(mozilla::PresShell* aPresShell,
  29                                 mozilla::ComputedStyle* aStyle);
  30
  31 class nsHTMLCanvasFrame final : public nsContainerFrame {
  32  public:
  33   typedef mozilla::layers::CanvasRenderer CanvasRenderer;
  34   typedef mozilla::layers::LayerManager LayerManager;
  35   typedef mozilla::layers::WebRenderCanvasData WebRenderCanvasData;
  36
  37   NS_DECL_QUERYFRAME
  38   NS_DECL_FRAMEARENA_HELPERS(nsHTMLCanvasFrame)
  39
  40   nsHTMLCanvasFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
  41       : nsContainerFrame(aStyle, aPresContext, kClassID) {}
  42
  43   virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
  44                                 const nsDisplayListSet& aLists) override;
  45
  46   void Destroy(DestroyContext&) override;
  47
  48   bool UpdateWebRenderCanvasData(nsDisplayListBuilder* aBuilder,
  49                                  WebRenderCanvasData* aCanvasData);
  50
  51   /* get the size of the canvas's image */
  52   nsIntSize GetCanvasSize() const;
  53
  54   virtual nscoord GetMinISize(gfxContext* aRenderingContext) override;
  55   virtual nscoord GetPrefISize(gfxContext* aRenderingContext) override;
  56   virtual mozilla::IntrinsicSize GetIntrinsicSize() override;
  57   mozilla::AspectRatio GetIntrinsicRatio() const override;
  58
  59   void UnionChildOverflow(mozilla::OverflowAreas& aOverflowAreas) override;
  60
  61   SizeComputationResult ComputeSize(
  62       gfxContext* aRenderingContext, mozilla::WritingMode aWM,
  63       const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
  64       const mozilla::LogicalSize& aMargin,
  65       const mozilla::LogicalSize& aBorderPadding,
  66       const mozilla::StyleSizeOverrides& aSizeOverrides,
  67       mozilla::ComputeSizeFlags aFlags) override;
  68
  69   virtual void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
  70                       const ReflowInput& aReflowInput,
  71                       nsReflowStatus& aStatus) override;
  72
  73 #ifdef ACCESSIBILITY
  74   virtual mozilla::a11y::AccType AccessibleType() override;
  75 #endif
  76
  77   virtual bool IsFrameOfType(uint32_t aFlags) const override {
  78     return nsSplittableFrame::IsFrameOfType(
  79         aFlags & ~(nsIFrame::eReplaced | nsIFrame::eReplacedSizing));
  80   }
  81
  82 #ifdef DEBUG_FRAME_DUMP
  83   virtual nsresult GetFrameName(nsAString& aResult) const override;
  84 #endif
  85
  86   // Inserted child content gets its frames parented by our child block
  87   virtual nsContainerFrame* GetContentInsertionFrame() override {
  88     return PrincipalChildList().FirstChild()->GetContentInsertionFrame();
  89   }
  90
  91   // Return the ::-moz-html-canvas-content anonymous box.
  92   void AppendDirectlyOwnedAnonBoxes(nsTArray<OwnedAnonBox>& aResult) override;
  93
  94  protected:
  95   virtual ~nsHTMLCanvasFrame();
  96 };
  97
  98 #endif /* nsHTMLCanvasFrame_h___ */