зеркало из https://github.com/mozilla/gecko-dev.git
278 строки
10 KiB
C++
278 строки
10 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef __NS_SVGOUTERSVGFRAME_H__
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#define __NS_SVGOUTERSVGFRAME_H__
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#include "mozilla/Attributes.h"
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#include "nsAutoPtr.h"
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#include "nsISVGSVGFrame.h"
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#include "nsSVGContainerFrame.h"
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#include "nsRegion.h"
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class gfxContext;
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class nsSVGForeignObjectFrame;
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////////////////////////////////////////////////////////////////////////
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// nsSVGOuterSVGFrame class
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class nsSVGOuterSVGFrame final : public nsSVGDisplayContainerFrame
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, public nsISVGSVGFrame
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{
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friend nsContainerFrame*
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NS_NewSVGOuterSVGFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
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protected:
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explicit nsSVGOuterSVGFrame(nsStyleContext* aContext);
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public:
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NS_DECL_QUERYFRAME
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NS_DECL_FRAMEARENA_HELPERS
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#ifdef DEBUG
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~nsSVGOuterSVGFrame() {
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NS_ASSERTION(!mForeignObjectHash || mForeignObjectHash->Count() == 0,
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"foreignObject(s) still registered!");
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}
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#endif
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// nsIFrame:
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virtual nscoord GetMinISize(nsRenderingContext *aRenderingContext) override;
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virtual nscoord GetPrefISize(nsRenderingContext *aRenderingContext) override;
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virtual mozilla::IntrinsicSize GetIntrinsicSize() override;
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virtual nsSize GetIntrinsicRatio() override;
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virtual mozilla::LogicalSize
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ComputeSize(nsRenderingContext *aRenderingContext,
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mozilla::WritingMode aWritingMode,
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const mozilla::LogicalSize& aCBSize,
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nscoord aAvailableISize,
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const mozilla::LogicalSize& aMargin,
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const mozilla::LogicalSize& aBorder,
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const mozilla::LogicalSize& aPadding,
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ComputeSizeFlags aFlags) override;
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virtual void Reflow(nsPresContext* aPresContext,
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ReflowOutput& aDesiredSize,
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const ReflowInput& aReflowInput,
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nsReflowStatus& aStatus) override;
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virtual void DidReflow(nsPresContext* aPresContext,
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const ReflowInput* aReflowInput,
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nsDidReflowStatus aStatus) override;
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virtual void UnionChildOverflow(nsOverflowAreas& aOverflowAreas) override;
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virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsRect& aDirtyRect,
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const nsDisplayListSet& aLists) override;
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virtual void Init(nsIContent* aContent,
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nsContainerFrame* aParent,
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nsIFrame* aPrevInFlow) override;
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virtual nsSplittableType GetSplittableType() const override;
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/**
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* Get the "type" of the frame
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*
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* @see nsGkAtoms::svgOuterSVGFrame
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*/
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virtual nsIAtom* GetType() const override;
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#ifdef DEBUG_FRAME_DUMP
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virtual nsresult GetFrameName(nsAString& aResult) const override
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{
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return MakeFrameName(NS_LITERAL_STRING("SVGOuterSVG"), aResult);
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}
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#endif
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virtual nsresult AttributeChanged(int32_t aNameSpaceID,
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nsIAtom* aAttribute,
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int32_t aModType) override;
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virtual nsContainerFrame* GetContentInsertionFrame() override {
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// Any children must be added to our single anonymous inner frame kid.
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MOZ_ASSERT(PrincipalChildList().FirstChild() &&
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PrincipalChildList().FirstChild()->GetType() ==
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nsGkAtoms::svgOuterSVGAnonChildFrame,
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"Where is our anonymous child?");
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return PrincipalChildList().FirstChild()->GetContentInsertionFrame();
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}
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virtual bool IsSVGTransformed(Matrix *aOwnTransform,
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Matrix *aFromParentTransform) const override {
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// Our anonymous wrapper performs the transforms. We simply
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// return whether we are transformed here but don't apply the transforms
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// themselves.
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return PrincipalChildList().FirstChild()->IsSVGTransformed();
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}
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// nsISVGSVGFrame interface:
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virtual void NotifyViewportOrTransformChanged(uint32_t aFlags) override;
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// nsISVGChildFrame methods:
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virtual DrawResult PaintSVG(gfxContext& aContext,
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const gfxMatrix& aTransform,
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const nsIntRect* aDirtyRect = nullptr) override;
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virtual SVGBBox GetBBoxContribution(const Matrix &aToBBoxUserspace,
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uint32_t aFlags) override;
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// nsSVGContainerFrame methods:
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virtual gfxMatrix GetCanvasTM() override;
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/* Methods to allow descendant nsSVGForeignObjectFrame frames to register and
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* unregister themselves with their nearest nsSVGOuterSVGFrame ancestor. This
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* is temporary until display list based invalidation is impleented for SVG.
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* Maintaining a list of our foreignObject descendants allows us to search
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* them for areas that need to be invalidated, without having to also search
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* the SVG frame tree for foreignObjects. This is important so that bug 539356
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* does not slow down SVG in general (only foreignObjects, until bug 614732 is
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* fixed).
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*/
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void RegisterForeignObject(nsSVGForeignObjectFrame* aFrame);
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void UnregisterForeignObject(nsSVGForeignObjectFrame* aFrame);
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virtual bool HasChildrenOnlyTransform(Matrix *aTransform) const override {
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// Our anonymous wrapper child must claim our children-only transforms as
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// its own so that our real children (the frames it wraps) are transformed
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// by them, and we must pretend we don't have any children-only transforms
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// so that our anonymous child is _not_ transformed by them.
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return false;
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}
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/**
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* Return true only if the height is unspecified (defaulting to 100%) or else
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* the height is explicitly set to a percentage value no greater than 100%.
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*/
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bool VerticalScrollbarNotNeeded() const;
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bool IsCallingReflowSVG() const {
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return mCallingReflowSVG;
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}
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void InvalidateSVG(const nsRegion& aRegion)
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{
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if (!aRegion.IsEmpty()) {
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mInvalidRegion.Or(mInvalidRegion, aRegion);
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InvalidateFrame();
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}
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}
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void ClearInvalidRegion() { mInvalidRegion.SetEmpty(); }
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const nsRegion& GetInvalidRegion() {
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nsRect rect;
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if (!IsInvalid(rect)) {
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mInvalidRegion.SetEmpty();
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}
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return mInvalidRegion;
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}
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nsRegion FindInvalidatedForeignObjectFrameChildren(nsIFrame* aFrame);
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protected:
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bool mCallingReflowSVG;
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/* Returns true if our content is the document element and our document is
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* embedded in an HTML 'object', 'embed' or 'applet' element. Set
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* aEmbeddingFrame to obtain the nsIFrame for the embedding HTML element.
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*/
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bool IsRootOfReplacedElementSubDoc(nsIFrame **aEmbeddingFrame = nullptr);
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/* Returns true if our content is the document element and our document is
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* being used as an image.
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*/
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bool IsRootOfImage();
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// This is temporary until display list based invalidation is implemented for
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// SVG.
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// A hash-set containing our nsSVGForeignObjectFrame descendants. Note we use
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// a hash-set to avoid the O(N^2) behavior we'd get tearing down an SVG frame
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// subtree if we were to use a list (see bug 381285 comment 20).
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nsAutoPtr<nsTHashtable<nsPtrHashKey<nsSVGForeignObjectFrame> > > mForeignObjectHash;
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nsAutoPtr<gfxMatrix> mCanvasTM;
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nsRegion mInvalidRegion;
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float mFullZoom;
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bool mViewportInitialized;
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bool mIsRootContent;
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};
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////////////////////////////////////////////////////////////////////////
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// nsSVGOuterSVGAnonChildFrame class
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/**
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* nsSVGOuterSVGFrames have a single direct child that is an instance of this
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* class, and which is used to wrap their real child frames. Such anonymous
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* wrapper frames created from this class exist because SVG frames need their
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* GetPosition() offset to be their offset relative to "user space" (in app
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* units) so that they can play nicely with nsDisplayTransform. This is fine
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* for all SVG frames except for direct children of an nsSVGOuterSVGFrame,
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* since an nsSVGOuterSVGFrame can have CSS border and padding (unlike other
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* SVG frames). The direct children can't include the offsets due to any such
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* border/padding in their mRects since that would break nsDisplayTransform,
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* but not including these offsets would break other parts of the Mozilla code
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* that assume a frame's mRect contains its border-box-to-parent-border-box
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* offset, in particular nsIFrame::GetOffsetTo and the functions that depend on
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* it. Wrapping an nsSVGOuterSVGFrame's children in an instance of this class
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* with its GetPosition() set to its nsSVGOuterSVGFrame's border/padding offset
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* keeps both nsDisplayTransform and nsIFrame::GetOffsetTo happy.
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*
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* The reason that this class inherit from nsSVGDisplayContainerFrame rather
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* than simply from nsContainerFrame is so that we can avoid having special
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* handling for these inner wrappers in multiple parts of the SVG code. For
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* example, the implementations of IsSVGTransformed and GetCanvasTM assume
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* nsSVGContainerFrame instances all the way up to the nsSVGOuterSVGFrame.
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*/
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class nsSVGOuterSVGAnonChildFrame : public nsSVGDisplayContainerFrame
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{
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friend nsContainerFrame*
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NS_NewSVGOuterSVGAnonChildFrame(nsIPresShell* aPresShell,
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nsStyleContext* aContext);
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explicit nsSVGOuterSVGAnonChildFrame(nsStyleContext* aContext)
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: nsSVGDisplayContainerFrame(aContext)
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{}
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public:
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NS_DECL_FRAMEARENA_HELPERS
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#ifdef DEBUG
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virtual void Init(nsIContent* aContent,
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nsContainerFrame* aParent,
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nsIFrame* aPrevInFlow) override;
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#endif
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#ifdef DEBUG_FRAME_DUMP
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virtual nsresult GetFrameName(nsAString& aResult) const override {
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return MakeFrameName(NS_LITERAL_STRING("SVGOuterSVGAnonChild"), aResult);
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}
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#endif
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/**
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* Get the "type" of the frame
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*
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* @see nsGkAtoms::svgOuterSVGAnonChildFrame
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*/
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virtual nsIAtom* GetType() const override;
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// nsSVGContainerFrame methods:
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virtual gfxMatrix GetCanvasTM() override {
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// GetCanvasTM returns the transform from an SVG frame to the frame's
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// nsSVGOuterSVGFrame's content box, so we do not include any x/y offset
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// set on us for any CSS border or padding on our nsSVGOuterSVGFrame.
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return static_cast<nsSVGOuterSVGFrame*>(GetParent())->GetCanvasTM();
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}
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virtual bool HasChildrenOnlyTransform(Matrix *aTransform) const override;
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};
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#endif
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