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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 */
/* rendering object for the HTML <canvas> element */
#ifndef nsHTMLCanvasFrame_h___
#define nsHTMLCanvasFrame_h___
#include "mozilla/Attributes.h"
#include "nsContainerFrame.h"
#include "nsStringFwd.h"
#include "FrameLayerBuilder.h"
namespace mozilla {
class PresShell;
namespace layers {
class CanvasRenderer;
class Layer;
class LayerManager;
class WebRenderCanvasData;
} // namespace layers
} // namespace mozilla
class nsPresContext;
class nsDisplayItem;
nsIFrame* NS_NewHTMLCanvasFrame(mozilla::PresShell* aPresShell,
mozilla::ComputedStyle* aStyle);
class nsHTMLCanvasFrame final : public nsContainerFrame {
typedef mozilla::layers::CanvasRenderer CanvasRenderer;
typedef mozilla::layers::Layer Layer;
typedef mozilla::layers::LayerManager LayerManager;
typedef mozilla::layers::WebRenderCanvasData WebRenderCanvasData;
typedef mozilla::ContainerLayerParameters ContainerLayerParameters;
explicit nsHTMLCanvasFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
: nsContainerFrame(aStyle, aPresContext, kClassID),
mBorderPadding(GetWritingMode()) {}
virtual void Init(nsIContent* aContent, nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) override;
virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) override;
void DestroyFrom(nsIFrame*, PostDestroyData&) override;
already_AddRefed<Layer> BuildLayer(
nsDisplayListBuilder* aBuilder, LayerManager* aManager,
nsDisplayItem* aItem,
const ContainerLayerParameters& aContainerParameters);
bool UpdateWebRenderCanvasData(nsDisplayListBuilder* aBuilder,
WebRenderCanvasData* aCanvasData);
/* get the size of the canvas's image */
nsIntSize GetCanvasSize() const;
virtual nscoord GetMinISize(gfxContext* aRenderingContext) override;
virtual nscoord GetPrefISize(gfxContext* aRenderingContext) override;
virtual mozilla::IntrinsicSize GetIntrinsicSize() override;
mozilla::AspectRatio GetIntrinsicRatio() const 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;
nsRect GetInnerArea() const;
virtual mozilla::a11y::AccType AccessibleType() override;
virtual bool IsFrameOfType(uint32_t aFlags) const override {
return nsSplittableFrame::IsFrameOfType(
aFlags & ~(nsIFrame::eReplaced | nsIFrame::eReplacedSizing));
virtual nsresult GetFrameName(nsAString& aResult) const override;
// 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;
virtual ~nsHTMLCanvasFrame();
nscoord GetContinuationOffset(nscoord* aWidth = 0) const;
mozilla::LogicalMargin mBorderPadding;
#endif /* nsHTMLCanvasFrame_h___ */