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      1 /*
      2  * Copyright (C) 2006 Apple Inc. All rights reserved.
      3  * Copyright (C) 2006, 2008 Nikolas Zimmermann <zimmermann (at) kde.org>
      4  *
      5  * This library is free software; you can redistribute it and/or
      6  * modify it under the terms of the GNU Library General Public
      7  * License as published by the Free Software Foundation; either
      8  * version 2 of the License, or (at your option) any later version.
      9  *
     10  * This library is distributed in the hope that it will be useful,
     11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13  * Library General Public License for more details.
     14  *
     15  * You should have received a copy of the GNU Library General Public License
     16  * along with this library; see the file COPYING.LIB.  If not, write to
     17  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     18  * Boston, MA 02110-1301, USA.
     19  */
     20 
     21 #ifndef SVGDocumentExtensions_h
     22 #define SVGDocumentExtensions_h
     23 
     24 #include "wtf/Forward.h"
     25 #include "wtf/HashMap.h"
     26 #include "wtf/HashSet.h"
     27 #include "wtf/text/AtomicStringHash.h"
     28 
     29 namespace WebCore {
     30 
     31 class Document;
     32 class RenderSVGResourceContainer;
     33 class SubtreeLayoutScope;
     34 class SVGElement;
     35 #if ENABLE(SVG_FONTS)
     36 class SVGFontFaceElement;
     37 #endif
     38 class SVGResourcesCache;
     39 class SVGSMILElement;
     40 class SVGSVGElement;
     41 class Element;
     42 
     43 class SVGDocumentExtensions {
     44     WTF_MAKE_NONCOPYABLE(SVGDocumentExtensions); WTF_MAKE_FAST_ALLOCATED;
     45 public:
     46     typedef HashSet<Element*> SVGPendingElements;
     47     SVGDocumentExtensions(Document*);
     48     ~SVGDocumentExtensions();
     49 
     50     void addTimeContainer(SVGSVGElement*);
     51     void removeTimeContainer(SVGSVGElement*);
     52 
     53     void addResource(const AtomicString& id, RenderSVGResourceContainer*);
     54     void removeResource(const AtomicString& id);
     55     RenderSVGResourceContainer* resourceById(const AtomicString& id) const;
     56 
     57     void startAnimations();
     58     void pauseAnimations();
     59     void unpauseAnimations();
     60     void dispatchSVGLoadEventToOutermostSVGElements();
     61 
     62     void reportWarning(const String&);
     63     void reportError(const String&);
     64 
     65     SVGResourcesCache* resourcesCache() const { return m_resourcesCache.get(); }
     66 
     67     HashSet<SVGElement*>* setOfElementsReferencingTarget(SVGElement* referencedElement) const;
     68     void addElementReferencingTarget(SVGElement* referencingElement, SVGElement* referencedElement);
     69     void removeAllTargetReferencesForElement(SVGElement*);
     70     void rebuildAllElementReferencesForTarget(SVGElement*);
     71     void removeAllElementReferencesForTarget(SVGElement*);
     72 
     73     void addSVGRootWithRelativeLengthDescendents(SVGSVGElement*);
     74     void removeSVGRootWithRelativeLengthDescendents(SVGSVGElement*);
     75     bool isSVGRootWithRelativeLengthDescendents(SVGSVGElement*) const;
     76     void invalidateSVGRootsWithRelativeLengthDescendents(SubtreeLayoutScope*);
     77 
     78 #if ENABLE(SVG_FONTS)
     79     const HashSet<SVGFontFaceElement*>& svgFontFaceElements() const { return m_svgFontFaceElements; }
     80     void registerSVGFontFaceElement(SVGFontFaceElement*);
     81     void unregisterSVGFontFaceElement(SVGFontFaceElement*);
     82 #endif
     83 
     84 private:
     85     Document* m_document; // weak reference
     86     HashSet<SVGSVGElement*> m_timeContainers; // For SVG 1.2 support this will need to be made more general.
     87 #if ENABLE(SVG_FONTS)
     88     HashSet<SVGFontFaceElement*> m_svgFontFaceElements;
     89 #endif
     90     HashMap<AtomicString, RenderSVGResourceContainer*> m_resources;
     91     HashMap<AtomicString, OwnPtr<SVGPendingElements> > m_pendingResources; // Resources that are pending.
     92     HashMap<AtomicString, OwnPtr<SVGPendingElements> > m_pendingResourcesForRemoval; // Resources that are pending and scheduled for removal.
     93     HashMap<SVGElement*, OwnPtr<HashSet<SVGElement*> > > m_elementDependencies;
     94     OwnPtr<SVGResourcesCache> m_resourcesCache;
     95     HashSet<SVGSVGElement*> m_relativeLengthSVGRoots; // Root SVG elements with relative length descendants.
     96 #if !ASSERT_DISABLED
     97     bool m_inRelativeLengthSVGRootsInvalidation;
     98 #endif
     99 
    100 public:
    101     // This HashMap contains a list of pending resources. Pending resources, are such
    102     // which are referenced by any object in the SVG document, but do NOT exist yet.
    103     // For instance, dynamically build gradients / patterns / clippers...
    104     void addPendingResource(const AtomicString& id, Element*);
    105     bool hasPendingResource(const AtomicString& id) const;
    106     bool isElementPendingResources(Element*) const;
    107     bool isElementPendingResource(Element*, const AtomicString& id) const;
    108     void clearHasPendingResourcesIfPossible(Element*);
    109     void removeElementFromPendingResources(Element*);
    110     PassOwnPtr<SVGPendingElements> removePendingResource(const AtomicString& id);
    111 
    112     // The following two functions are used for scheduling a pending resource to be removed.
    113     void markPendingResourcesForRemoval(const AtomicString&);
    114     Element* removeElementFromPendingResourcesForRemoval(const AtomicString&);
    115 
    116 private:
    117     PassOwnPtr<SVGPendingElements> removePendingResourceForRemoval(const AtomicString&);
    118 };
    119 
    120 }
    121 
    122 #endif
    123