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author | Matt A. Tobin <mattatobin@localhost.localdomain> | 2018-02-02 04:16:08 -0500 |
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committer | Matt A. Tobin <mattatobin@localhost.localdomain> | 2018-02-02 04:16:08 -0500 |
commit | 5f8de423f190bbb79a62f804151bc24824fa32d8 (patch) | |
tree | 10027f336435511475e392454359edea8e25895d /layout/svg/nsSVGEffects.h | |
parent | 49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff) | |
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Add m-esr52 at 52.6.0
Diffstat (limited to 'layout/svg/nsSVGEffects.h')
-rw-r--r-- | layout/svg/nsSVGEffects.h | 636 |
1 files changed, 636 insertions, 0 deletions
diff --git a/layout/svg/nsSVGEffects.h b/layout/svg/nsSVGEffects.h new file mode 100644 index 000000000..9dd92fd31 --- /dev/null +++ b/layout/svg/nsSVGEffects.h @@ -0,0 +1,636 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* 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/. */ + +#ifndef NSSVGEFFECTS_H_ +#define NSSVGEFFECTS_H_ + +#include "mozilla/Attributes.h" +#include "FramePropertyTable.h" +#include "mozilla/dom/Element.h" +#include "nsHashKeys.h" +#include "nsID.h" +#include "nsIFrame.h" +#include "nsIMutationObserver.h" +#include "nsInterfaceHashtable.h" +#include "nsISupportsBase.h" +#include "nsISupportsImpl.h" +#include "nsReferencedElement.h" +#include "nsStubMutationObserver.h" +#include "nsSVGUtils.h" +#include "nsTHashtable.h" +#include "nsURIHashKey.h" +#include "nsCycleCollectionParticipant.h" + +class nsIAtom; +class nsIPresShell; +class nsIURI; +class nsSVGClipPathFrame; +class nsSVGPaintServerFrame; +class nsSVGFilterFrame; +class nsSVGMaskFrame; +class nsSVGFilterChainObserver; + +/* + * This interface allows us to be notified when a piece of SVG content is + * re-rendered. + * + * Concrete implementations of this interface need to implement + * "GetTarget()" to specify the piece of SVG content that they'd like to + * monitor, and they need to implement "DoUpdate" to specify how we'll react + * when that content gets re-rendered. They also need to implement a + * constructor and destructor, which should call StartListening and + * StopListening, respectively. + */ +class nsSVGRenderingObserver : public nsStubMutationObserver +{ + +protected: + virtual ~nsSVGRenderingObserver() + {} + +public: + typedef mozilla::dom::Element Element; + nsSVGRenderingObserver() + : mInObserverList(false) + {} + + // nsIMutationObserver + NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED + NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED + NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED + NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED + + void InvalidateViaReferencedElement(); + + // When a nsSVGRenderingObserver list gets forcibly cleared, it uses this + // callback to notify every observer that's cleared from it, so they can + // react. + void NotifyEvictedFromRenderingObserverList(); + + bool IsInObserverList() const { return mInObserverList; } + + nsIFrame* GetReferencedFrame(); + /** + * @param aOK this is only for the convenience of callers. We set *aOK to false + * if the frame is the wrong type + */ + nsIFrame* GetReferencedFrame(nsIAtom* aFrameType, bool* aOK); + + Element* GetReferencedElement(); + + virtual bool ObservesReflow() { return true; } + +protected: + // Non-virtual protected methods + void StartListening(); + void StopListening(); + + // Virtual protected methods + virtual void DoUpdate() = 0; // called when the referenced resource changes. + + // This is an internally-used version of GetReferencedElement that doesn't + // forcibly add us as an observer. (whereas GetReferencedElement does) + virtual Element* GetTarget() = 0; + + // Whether we're in our referenced element's observer list at this time. + bool mInObserverList; +}; + + +/* + * SVG elements reference supporting resources by element ID. We need to + * track when those resources change and when the DOM changes in ways + * that affect which element is referenced by a given ID (e.g., when + * element IDs change). The code here is responsible for that. + * + * When a frame references a supporting resource, we create a property + * object derived from nsSVGIDRenderingObserver to manage the relationship. The + * property object is attached to the referencing frame. + */ +class nsSVGIDRenderingObserver : public nsSVGRenderingObserver +{ +public: + typedef mozilla::dom::Element Element; + nsSVGIDRenderingObserver(nsIURI* aURI, nsIContent* aObservingContent, + bool aReferenceImage); + virtual ~nsSVGIDRenderingObserver(); + +protected: + Element* GetTarget() override { return mElement.get(); } + + // This is called when the referenced resource changes. + virtual void DoUpdate() override; + + class SourceReference : public nsReferencedElement + { + public: + explicit SourceReference(nsSVGIDRenderingObserver* aContainer) : mContainer(aContainer) {} + protected: + virtual void ElementChanged(Element* aFrom, Element* aTo) override { + mContainer->StopListening(); + nsReferencedElement::ElementChanged(aFrom, aTo); + mContainer->StartListening(); + mContainer->DoUpdate(); + } + /** + * Override IsPersistent because we want to keep tracking the element + * for the ID even when it changes. + */ + virtual bool IsPersistent() override { return true; } + private: + nsSVGIDRenderingObserver* mContainer; + }; + + SourceReference mElement; +}; + +struct nsSVGFrameReferenceFromProperty +{ + explicit nsSVGFrameReferenceFromProperty(nsIFrame* aFrame) + : mFrame(aFrame) + , mFramePresShell(aFrame->PresContext()->PresShell()) + {} + + // Clear our reference to the frame. + void Detach(); + + // null if the frame has become invalid + nsIFrame* Get(); + +private: + // The frame that this property is attached to, may be null + nsIFrame *mFrame; + // When a presshell is torn down, we don't delete the properties for + // each frame until after the frames are destroyed. So here we remember + // the presshell for the frames we care about and, before we use the frame, + // we test the presshell to see if it's destroying itself. If it is, + // then the frame pointer is not valid and we know the frame has gone away. + // mFramePresShell may be null, but when mFrame is non-null, mFramePresShell + // is guaranteed to be non-null, too. + nsIPresShell *mFramePresShell; +}; + +class nsSVGRenderingObserverProperty : public nsSVGIDRenderingObserver +{ +public: + NS_DECL_ISUPPORTS + + nsSVGRenderingObserverProperty(nsIURI* aURI, nsIFrame *aFrame, + bool aReferenceImage) + : nsSVGIDRenderingObserver(aURI, aFrame->GetContent(), aReferenceImage) + , mFrameReference(aFrame) + {} + +protected: + virtual ~nsSVGRenderingObserverProperty() {} + + virtual void DoUpdate() override; + + nsSVGFrameReferenceFromProperty mFrameReference; +}; + +/** + * In a filter chain, there can be multiple SVG reference filters. + * e.g. filter: url(#svg-filter-1) blur(10px) url(#svg-filter-2); + * + * This class keeps track of one SVG reference filter in a filter chain. + * e.g. url(#svg-filter-1) + * + * It fires invalidations when the SVG filter element's id changes or when + * the SVG filter element's content changes. + * + * The nsSVGFilterChainObserver class manages a list of nsSVGFilterReferences. + */ +class nsSVGFilterReference final : public nsSVGIDRenderingObserver + , public nsISVGFilterReference +{ +public: + nsSVGFilterReference(nsIURI* aURI, + nsIContent* aObservingContent, + nsSVGFilterChainObserver* aFilterChainObserver) + : nsSVGIDRenderingObserver(aURI, aObservingContent, false) + , mFilterChainObserver(aFilterChainObserver) + { + } + + bool ReferencesValidResource() { return GetFilterFrame(); } + + void DetachFromChainObserver() { mFilterChainObserver = nullptr; } + + /** + * @return the filter frame, or null if there is no filter frame + */ + nsSVGFilterFrame *GetFilterFrame(); + + // nsISupports + NS_DECL_CYCLE_COLLECTING_ISUPPORTS + NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(nsSVGFilterReference, nsSVGIDRenderingObserver) + + // nsISVGFilterReference + virtual void Invalidate() override { DoUpdate(); }; + +protected: + virtual ~nsSVGFilterReference() {} + + // nsSVGIDRenderingObserver + virtual void DoUpdate() override; + +private: + nsSVGFilterChainObserver* mFilterChainObserver; +}; + +/** + * This class manages a list of nsSVGFilterReferences, which represent SVG + * reference filters in a filter chain. + * e.g. filter: url(#svg-filter-1) blur(10px) url(#svg-filter-2); + * + * In the above example, the nsSVGFilterChainObserver will manage two + * nsSVGFilterReferences, one for each SVG reference filter. CSS filters like + * "blur(10px)" don't reference filter elements, so they don't need an + * nsSVGFilterReference. The style system invalidates changes to CSS filters. + */ +class nsSVGFilterChainObserver : public nsISupports +{ +public: + nsSVGFilterChainObserver(const nsTArray<nsStyleFilter>& aFilters, + nsIContent* aFilteredElement, + nsIFrame* aFiltedFrame = nullptr); + + bool ReferencesValidResources(); + bool IsInObserverLists() const; + void Invalidate() { DoUpdate(); } + + // nsISupports + NS_DECL_CYCLE_COLLECTING_ISUPPORTS + NS_DECL_CYCLE_COLLECTION_CLASS(nsSVGFilterChainObserver) + +protected: + virtual ~nsSVGFilterChainObserver(); + + virtual void DoUpdate() = 0; + +private: + + void DetachReferences() + { + for (uint32_t i = 0; i < mReferences.Length(); i++) { + mReferences[i]->DetachFromChainObserver(); + } + } + + nsTArray<RefPtr<nsSVGFilterReference>> mReferences; +}; + +class nsSVGFilterProperty : public nsSVGFilterChainObserver +{ +public: + nsSVGFilterProperty(const nsTArray<nsStyleFilter>& aFilters, + nsIFrame* aFilteredFrame) + : nsSVGFilterChainObserver(aFilters, aFilteredFrame->GetContent(), + aFilteredFrame) + , mFrameReference(aFilteredFrame) + {} + + void DetachFromFrame() { mFrameReference.Detach(); } + +protected: + virtual void DoUpdate() override; + + nsSVGFrameReferenceFromProperty mFrameReference; +}; + +class nsSVGMarkerProperty final: public nsSVGRenderingObserverProperty +{ +public: + nsSVGMarkerProperty(nsIURI* aURI, nsIFrame* aFrame, bool aReferenceImage) + : nsSVGRenderingObserverProperty(aURI, aFrame, aReferenceImage) {} + +protected: + virtual void DoUpdate() override; +}; + +class nsSVGTextPathProperty final : public nsSVGRenderingObserverProperty +{ +public: + nsSVGTextPathProperty(nsIURI* aURI, nsIFrame* aFrame, bool aReferenceImage) + : nsSVGRenderingObserverProperty(aURI, aFrame, aReferenceImage) + , mValid(true) {} + + virtual bool ObservesReflow() override { return false; } + +protected: + virtual void DoUpdate() override; + +private: + /** + * Returns true if the target of the textPath is the frame of a 'path' element. + */ + bool TargetIsValid(); + + bool mValid; +}; + +class nsSVGPaintingProperty final : public nsSVGRenderingObserverProperty +{ +public: + nsSVGPaintingProperty(nsIURI* aURI, nsIFrame* aFrame, bool aReferenceImage) + : nsSVGRenderingObserverProperty(aURI, aFrame, aReferenceImage) {} + +protected: + virtual void DoUpdate() override; +}; + +class nsSVGMaskProperty final : public nsISupports +{ +public: + explicit nsSVGMaskProperty(nsIFrame* aFrame); + + // nsISupports + NS_DECL_ISUPPORTS + + const nsTArray<RefPtr<nsSVGPaintingProperty>>& GetProps() const + { + return mProperties; + } + +private: + virtual ~nsSVGMaskProperty() {} + nsTArray<RefPtr<nsSVGPaintingProperty>> mProperties; +}; + +/** + * A manager for one-shot nsSVGRenderingObserver tracking. + * nsSVGRenderingObservers can be added or removed. They are not strongly + * referenced so an observer must be removed before it dies. + * When InvalidateAll is called, all outstanding references get + * InvalidateViaReferencedElement() + * called on them and the list is cleared. The intent is that + * the observer will force repainting of whatever part of the document + * is needed, and then at paint time the observer will do a clean lookup + * of the referenced element and [re-]add itself to the element's observer list. + * + * InvalidateAll must be called before this object is destroyed, i.e. + * before the referenced frame is destroyed. This should normally happen + * via nsSVGContainerFrame::RemoveFrame, since only frames in the frame + * tree should be referenced. + */ +class nsSVGRenderingObserverList +{ +public: + nsSVGRenderingObserverList() + : mObservers(4) + { + MOZ_COUNT_CTOR(nsSVGRenderingObserverList); + } + + ~nsSVGRenderingObserverList() { + InvalidateAll(); + MOZ_COUNT_DTOR(nsSVGRenderingObserverList); + } + + void Add(nsSVGRenderingObserver* aObserver) + { mObservers.PutEntry(aObserver); } + void Remove(nsSVGRenderingObserver* aObserver) + { mObservers.RemoveEntry(aObserver); } +#ifdef DEBUG + bool Contains(nsSVGRenderingObserver* aObserver) + { return (mObservers.GetEntry(aObserver) != nullptr); } +#endif + bool IsEmpty() + { return mObservers.Count() == 0; } + + /** + * Drop all our observers, and notify them that we have changed and dropped + * our reference to them. + */ + void InvalidateAll(); + + /** + * Drop all observers that observe reflow, and notify them that we have changed and dropped + * our reference to them. + */ + void InvalidateAllForReflow(); + + /** + * Drop all our observers, and notify them that we have dropped our reference + * to them. + */ + void RemoveAll(); + +private: + nsTHashtable<nsPtrHashKey<nsSVGRenderingObserver> > mObservers; +}; + +class nsSVGEffects +{ +public: + typedef mozilla::dom::Element Element; + typedef nsInterfaceHashtable<nsURIHashKey, nsIMutationObserver> + URIObserverHashtable; + + using PaintingPropertyDescriptor = + const mozilla::FramePropertyDescriptor<nsSVGPaintingProperty>*; + using URIObserverHashtablePropertyDescriptor = + const mozilla::FramePropertyDescriptor<URIObserverHashtable>*; + + static void DestroyFilterProperty(nsSVGFilterProperty* aProp) + { + // nsSVGFilterProperty is cycle-collected, so dropping the last reference + // doesn't necessarily destroy it. We need to tell it that the frame + // has now become invalid. + aProp->DetachFromFrame(); + + aProp->Release(); + } + + NS_DECLARE_FRAME_PROPERTY_WITH_DTOR(FilterProperty, nsSVGFilterProperty, + DestroyFilterProperty) + NS_DECLARE_FRAME_PROPERTY_RELEASABLE(MaskProperty, nsSVGMaskProperty) + NS_DECLARE_FRAME_PROPERTY_RELEASABLE(ClipPathProperty, nsSVGPaintingProperty) + NS_DECLARE_FRAME_PROPERTY_RELEASABLE(MarkerBeginProperty, nsSVGMarkerProperty) + NS_DECLARE_FRAME_PROPERTY_RELEASABLE(MarkerMiddleProperty, nsSVGMarkerProperty) + NS_DECLARE_FRAME_PROPERTY_RELEASABLE(MarkerEndProperty, nsSVGMarkerProperty) + NS_DECLARE_FRAME_PROPERTY_RELEASABLE(FillProperty, nsSVGPaintingProperty) + NS_DECLARE_FRAME_PROPERTY_RELEASABLE(StrokeProperty, nsSVGPaintingProperty) + NS_DECLARE_FRAME_PROPERTY_RELEASABLE(HrefAsTextPathProperty, + nsSVGTextPathProperty) + NS_DECLARE_FRAME_PROPERTY_RELEASABLE(HrefAsPaintingProperty, + nsSVGPaintingProperty) + NS_DECLARE_FRAME_PROPERTY_DELETABLE(BackgroundImageProperty, + URIObserverHashtable) + + /** + * Get the paint server for a aTargetFrame. + */ + static nsSVGPaintServerFrame *GetPaintServer(nsIFrame* aTargetFrame, + nsStyleSVGPaint nsStyleSVG::* aPaint, + PaintingPropertyDescriptor aProperty); + + struct EffectProperties { + nsSVGFilterProperty* mFilter; + nsSVGMaskProperty* mMask; + nsSVGPaintingProperty* mClipPath; + + /** + * @return the clip-path frame, or null if there is no clip-path frame + * @param aOK if a clip-path was specified and the designated element + * exists but is an element of the wrong type, *aOK is set to false. + * Otherwise *aOK is untouched. + */ + nsSVGClipPathFrame *GetClipPathFrame(bool* aOK); + /** + * @return the first mask frame, or null if there is no mask frame + * @param aOK if a mask was specified and the designated element + * exists but is an element of the wrong type, *aOK is set to false. + * Otherwise *aOK is untouched. + */ + nsSVGMaskFrame *GetFirstMaskFrame(bool* aOK = nullptr); + + /** + * @return an array which contains all SVG mask frames. + */ + nsTArray<nsSVGMaskFrame*> GetMaskFrames(); + + bool HasValidFilter() { + return mFilter && mFilter->ReferencesValidResources(); + } + + bool HasNoFilterOrHasValidFilter() { + return !mFilter || mFilter->ReferencesValidResources(); + } + }; + + /** + * @param aFrame should be the first continuation + */ + static EffectProperties GetEffectProperties(nsIFrame* aFrame); + + /** + * Called when changes to an element (e.g. CSS property changes) cause its + * frame to start/stop referencing (or reference different) SVG resource + * elements. (_Not_ called for changes to referenced resource elements.) + * + * This function handles such changes by discarding _all_ the frame's SVG + * effects frame properties (causing those properties to stop watching their + * target element). It also synchronously (re)creates the filter and marker + * frame properties (XXX why not the other properties?), which makes it + * useful for initializing those properties during first reflow. + * + * XXX rename to something more meaningful like RefreshResourceReferences? + */ + static void UpdateEffects(nsIFrame* aFrame); + + /** + * @param aFrame should be the first continuation + */ + static nsSVGFilterProperty *GetFilterProperty(nsIFrame* aFrame); + + /** + * @param aFrame must be a first-continuation. + */ + static void AddRenderingObserver(Element* aElement, nsSVGRenderingObserver *aObserver); + /** + * @param aFrame must be a first-continuation. + */ + static void RemoveRenderingObserver(Element* aElement, nsSVGRenderingObserver *aObserver); + + /** + * Removes all rendering observers from aElement. + */ + static void RemoveAllRenderingObservers(Element* aElement); + + /** + * This can be called on any frame. We invalidate the observers of aFrame's + * element, if any, or else walk up to the nearest observable SVG parent + * frame with observers and invalidate them instead. + * + * Note that this method is very different to e.g. + * nsNodeUtils::AttributeChanged which walks up the content node tree all the + * way to the root node (not stopping if it encounters a non-container SVG + * node) invalidating all mutation observers (not just + * nsSVGRenderingObservers) on all nodes along the way (not just the first + * node it finds with observers). In other words, by doing all the + * things in parentheses in the preceding sentence, this method uses + * knowledge about our implementation and what can be affected by SVG effects + * to make invalidation relatively lightweight when an SVG effect changes. + */ + static void InvalidateRenderingObservers(nsIFrame* aFrame); + + enum { + INVALIDATE_REFLOW = 1 + }; + + /** + * This can be called on any element or frame. Only direct observers of this + * (frame's) element, if any, are invalidated. + */ + static void InvalidateDirectRenderingObservers(Element* aElement, uint32_t aFlags = 0); + static void InvalidateDirectRenderingObservers(nsIFrame* aFrame, uint32_t aFlags = 0); + + /** + * Get an nsSVGMarkerProperty for the frame, creating a fresh one if necessary + */ + static nsSVGMarkerProperty * + GetMarkerProperty(nsIURI* aURI, nsIFrame* aFrame, + const mozilla::FramePropertyDescriptor<nsSVGMarkerProperty>* aProperty); + /** + * Get an nsSVGTextPathProperty for the frame, creating a fresh one if necessary + */ + static nsSVGTextPathProperty * + GetTextPathProperty(nsIURI* aURI, nsIFrame* aFrame, + const mozilla::FramePropertyDescriptor<nsSVGTextPathProperty>* aProperty); + /** + * Get an nsSVGPaintingProperty for the frame, creating a fresh one if necessary + */ + static nsSVGPaintingProperty* + GetPaintingProperty(nsIURI* aURI, nsIFrame* aFrame, + const mozilla::FramePropertyDescriptor<nsSVGPaintingProperty>* aProperty); + /** + * Get an nsSVGPaintingProperty for the frame for that URI, creating a fresh + * one if necessary + */ + static nsSVGPaintingProperty* + GetPaintingPropertyForURI(nsIURI* aURI, nsIFrame* aFrame, + URIObserverHashtablePropertyDescriptor aProp); + + /** + * A helper function to resolve marker's URL. + */ + static already_AddRefed<nsIURI> + GetMarkerURI(nsIFrame* aFrame, + RefPtr<mozilla::css::URLValue> nsStyleSVG::* aMarker); + + /** + * A helper function to resolve clip-path URL. + */ + static already_AddRefed<nsIURI> + GetClipPathURI(nsIFrame* aFrame); + + /** + * A helper function to resolve filter URL. + */ + static already_AddRefed<nsIURI> + GetFilterURI(nsIFrame* aFrame, uint32_t aIndex); + + /** + * A helper function to resolve filter URL. + */ + static already_AddRefed<nsIURI> + GetFilterURI(nsIFrame* aFrame, const nsStyleFilter& aFilter); + + /** + * A helper function to resolve paint-server URL. + */ + static already_AddRefed<nsIURI> + GetPaintURI(nsIFrame* aFrame, nsStyleSVGPaint nsStyleSVG::* aPaint); + + /** + * A helper function to resolve SVG mask URL. + */ + static already_AddRefed<nsIURI> + GetMaskURI(nsIFrame* aFrame, uint32_t aIndex); +}; + +#endif /*NSSVGEFFECTS_H_*/ |