nsHTMLCanvasFrame.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* 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 "nsStringFwd.h"

namespace mozilla {

class PresShell;

namespace layers {

class CanvasRenderer;

class Layer;

class LayerManager;

class WebRenderCanvasData;

}  // namespace layers

}  // namespace mozilla

class nsPresContext;

nsIFrame* NS_NewHTMLCanvasFrame(mozilla::PresShell* aPresShell,

                                mozilla::ComputedStyle* aStyle);

class nsHTMLCanvasFrame final : public nsContainerFrame {

 public:

  typedef mozilla::layers::CanvasRenderer CanvasRenderer;

  typedef mozilla::layers::LayerManager LayerManager;

  typedef mozilla::layers::WebRenderCanvasData WebRenderCanvasData;

  NS_DECL_QUERYFRAME

  NS_DECL_FRAMEARENA_HELPERS(nsHTMLCanvasFrame)

  nsHTMLCanvasFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)

      : nsContainerFrame(aStyle, aPresContext, kClassID) {}

  virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,

                                const nsDisplayListSet& aLists) override;

  void Destroy(DestroyContext&) override;

  bool UpdateWebRenderCanvasData(nsDisplayListBuilder* aBuilder,

                                 WebRenderCanvasData* aCanvasData);

  // Get the size of the canvas's image in CSS pixels.

  mozilla::CSSIntSize GetCanvasSize() const;

  nscoord IntrinsicISize(const mozilla::IntrinsicSizeInput& aInput,

                         mozilla::IntrinsicISizeType aType) override;

  virtual mozilla::IntrinsicSize GetIntrinsicSize() override;

  mozilla::AspectRatio GetIntrinsicRatio() const override;

  void UnionChildOverflow(mozilla::OverflowAreas&, bool aAsIfScrolled) override;

  SizeComputationResult ComputeSize(

      gfxContext* aRenderingContext, mozilla::WritingMode aWM,

      const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,

      const mozilla::LogicalSize& aMargin,

      const mozilla::LogicalSize& aBorderPadding,

      const mozilla::StyleSizeOverrides& aSizeOverrides,

      mozilla::ComputeSizeFlags aFlags) override;

  virtual void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,

                      const ReflowInput& aReflowInput,

                      nsReflowStatus& aStatus) override;

#ifdef ACCESSIBILITY

  virtual mozilla::a11y::AccType AccessibleType() override;

#endif

#ifdef DEBUG_FRAME_DUMP

  virtual nsresult GetFrameName(nsAString& aResult) const override;

#endif

  // Inserted child content gets its frames parented by our child block

  virtual nsContainerFrame* GetContentInsertionFrame() override {

    return PrincipalChildList().FirstChild()->GetContentInsertionFrame();

  // Return the ::-moz-html-canvas-content anonymous box.

  void AppendDirectlyOwnedAnonBoxes(nsTArray<OwnedAnonBox>& aResult) override;

 protected:

  virtual ~nsHTMLCanvasFrame();

};

#endif /* nsHTMLCanvasFrame_h___ */