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      1 /*
      2  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
      3  *
      4  * This library is free software; you can redistribute it and/or
      5  * modify it under the terms of the GNU Library General Public
      6  * License as published by the Free Software Foundation; either
      7  * version 2 of the License, or (at your option) any later version.
      8  *
      9  * This library is distributed in the hope that it will be useful,
     10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     12  * Library General Public License for more details.
     13  *
     14  * You should have received a copy of the GNU Library General Public License
     15  * along with this library; see the file COPYING.LIB.  If not, write to
     16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     17  * Boston, MA 02110-1301, USA.
     18  */
     19 
     20 #ifndef RenderSVGResourceContainer_h
     21 #define RenderSVGResourceContainer_h
     22 
     23 #include "core/rendering/svg/RenderSVGHiddenContainer.h"
     24 #include "core/rendering/svg/RenderSVGResource.h"
     25 
     26 namespace WebCore {
     27 
     28 class RenderLayer;
     29 
     30 class RenderSVGResourceContainer : public RenderSVGHiddenContainer,
     31                                    public RenderSVGResource {
     32 public:
     33     explicit RenderSVGResourceContainer(SVGElement*);
     34     virtual ~RenderSVGResourceContainer();
     35 
     36     virtual void layout();
     37     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) OVERRIDE FINAL;
     38 
     39     virtual bool isSVGResourceContainer() const OVERRIDE FINAL { return true; }
     40 
     41     static bool shouldTransformOnTextPainting(RenderObject*, AffineTransform&);
     42     static AffineTransform transformOnNonScalingStroke(RenderObject*, const AffineTransform& resourceTransform);
     43 
     44     void idChanged();
     45     void addClientRenderLayer(Node*);
     46     void addClientRenderLayer(RenderLayer*);
     47     void removeClientRenderLayer(RenderLayer*);
     48 
     49     void invalidateCacheAndMarkForLayout(SubtreeLayoutScope* = 0);
     50 
     51 protected:
     52     // When adding modes, make sure we don't overflow m_invalidationMask below.
     53     enum InvalidationMode {
     54         LayoutAndBoundariesInvalidation = 1 << 0,
     55         BoundariesInvalidation = 1 << 1,
     56         RepaintInvalidation = 1 << 2,
     57         ParentOnlyInvalidation = 1 << 3
     58     };
     59 
     60     // Used from the invalidateClient/invalidateClients methods from classes, inheriting from us.
     61     void markAllClientsForInvalidation(InvalidationMode);
     62     void markAllClientLayersForInvalidation();
     63     void markClientForInvalidation(RenderObject*, InvalidationMode);
     64 
     65     void clearInvalidationMask() { m_invalidationMask = 0; }
     66 
     67     bool m_isInLayout;
     68 
     69 private:
     70     friend class SVGResourcesCache;
     71     void addClient(RenderObject*);
     72     void removeClient(RenderObject*);
     73 
     74     virtual void willBeDestroyed() OVERRIDE FINAL;
     75     void registerResource();
     76 
     77     AtomicString m_id;
     78     // Track global (markAllClientsForInvalidation) invals to avoid redundant crawls.
     79     unsigned m_invalidationMask : 8;
     80 
     81     bool m_registered : 1;
     82     bool m_isInvalidating : 1;
     83     // 22 padding bits available
     84 
     85     HashSet<RenderObject*> m_clients;
     86     HashSet<RenderLayer*> m_clientLayers;
     87 };
     88 
     89 inline RenderSVGResourceContainer* getRenderSVGResourceContainerById(Document& document, const AtomicString& id)
     90 {
     91     if (id.isEmpty())
     92         return 0;
     93 
     94     if (RenderSVGResourceContainer* renderResource = document.accessSVGExtensions()->resourceById(id))
     95         return renderResource;
     96 
     97     return 0;
     98 }
     99 
    100 template<typename Renderer>
    101 Renderer* getRenderSVGResourceById(Document& document, const AtomicString& id)
    102 {
    103     if (RenderSVGResourceContainer* container = getRenderSVGResourceContainerById(document, id))
    104         return container->cast<Renderer>();
    105 
    106     return 0;
    107 }
    108 
    109 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderSVGResourceContainer, isSVGResourceContainer());
    110 
    111 }
    112 
    113 #endif
    114