tor-browser

The Tor Browser
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nsHTMLCanvasFrame.h (3071B)

      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 "nsContainerFrame.h"
     13 #include "nsStringFwd.h"
     14 
     15 namespace mozilla {
     16 class PresShell;
     17 namespace layers {
     18 class WebRenderCanvasData;
     19 }  // namespace layers
     20 }  // namespace mozilla
     21 
     22 class nsPresContext;
     23 
     24 nsIFrame* NS_NewHTMLCanvasFrame(mozilla::PresShell* aPresShell,
     25                                mozilla::ComputedStyle* aStyle);
     26 
     27 class nsHTMLCanvasFrame final : public nsContainerFrame {
     28 public:
     29  using WebRenderCanvasData = mozilla::layers::WebRenderCanvasData;
     30 
     31  NS_DECL_QUERYFRAME
     32  NS_DECL_FRAMEARENA_HELPERS(nsHTMLCanvasFrame)
     33 
     34  nsHTMLCanvasFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
     35      : nsContainerFrame(aStyle, aPresContext, kClassID) {}
     36 
     37  void BuildDisplayList(nsDisplayListBuilder* aBuilder,
     38                        const nsDisplayListSet& aLists) override;
     39 
     40  void Destroy(DestroyContext&) override;
     41 
     42  bool UpdateWebRenderCanvasData(nsDisplayListBuilder* aBuilder,
     43                                 WebRenderCanvasData* aCanvasData);
     44 
     45  // Get the size of the canvas's image in CSS pixels.
     46  mozilla::CSSIntSize GetCanvasSize() const;
     47 
     48  nscoord IntrinsicISize(const mozilla::IntrinsicSizeInput& aInput,
     49                         mozilla::IntrinsicISizeType aType) override;
     50 
     51  mozilla::IntrinsicSize GetIntrinsicSize() override;
     52  mozilla::AspectRatio GetIntrinsicRatio() const override;
     53 
     54  void UnionChildOverflow(mozilla::OverflowAreas&, bool aAsIfScrolled) override;
     55 
     56  SizeComputationResult ComputeSize(
     57      const SizeComputationInput& aSizingInput, mozilla::WritingMode aWM,
     58      const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
     59      const mozilla::LogicalSize& aMargin,
     60      const mozilla::LogicalSize& aBorderPadding,
     61      const mozilla::StyleSizeOverrides& aSizeOverrides,
     62      mozilla::ComputeSizeFlags aFlags) override;
     63 
     64  void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
     65              const ReflowInput& aReflowInput,
     66              nsReflowStatus& aStatus) override;
     67 
     68  nsRect GetDestRect(const nsRect& aFrameContentBox) const;
     69 
     70 #ifdef ACCESSIBILITY
     71  mozilla::a11y::AccType AccessibleType() override;
     72 #endif
     73 
     74 #ifdef DEBUG_FRAME_DUMP
     75  nsresult GetFrameName(nsAString& aResult) const override;
     76 #endif
     77 
     78  // Inserted child content gets its frames parented by our child block
     79  nsContainerFrame* GetContentInsertionFrame() override {
     80    return PrincipalChildList().FirstChild()->GetContentInsertionFrame();
     81  }
     82 
     83  // Return the ::-moz-html-canvas-content anonymous box.
     84  void AppendDirectlyOwnedAnonBoxes(nsTArray<OwnedAnonBox>& aResult) override;
     85 
     86 protected:
     87  virtual ~nsHTMLCanvasFrame();
     88 };
     89 
     90 #endif /* nsHTMLCanvasFrame_h___ */