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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 #include "core/svg/SVGDocumentExtensions.h"
     26 
     27 namespace blink {
     28 
     29 class RenderLayer;
     30 
     31 class RenderSVGResourceContainer : public RenderSVGHiddenContainer,
     32                                    public RenderSVGResource {
     33 public:
     34     explicit RenderSVGResourceContainer(SVGElement*);
     35     virtual ~RenderSVGResourceContainer();
     36 
     37     virtual void layout() OVERRIDE;
     38     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) OVERRIDE FINAL;
     39 
     40     virtual bool isSVGResourceContainer() const OVERRIDE FINAL { return true; }
     41 
     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         PaintInvalidation = 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     static AffineTransform computeResourceSpaceTransform(RenderObject*, const AffineTransform& baseTransform, const SVGRenderStyle&, unsigned short resourceMode);
     68 
     69     bool m_isInLayout;
     70 
     71 private:
     72     friend class SVGResourcesCache;
     73     void addClient(RenderObject*);
     74     void removeClient(RenderObject*);
     75 
     76     virtual void willBeDestroyed() OVERRIDE FINAL;
     77     void registerResource();
     78 
     79     AtomicString m_id;
     80     // Track global (markAllClientsForInvalidation) invals to avoid redundant crawls.
     81     unsigned m_invalidationMask : 8;
     82 
     83     bool m_registered : 1;
     84     bool m_isInvalidating : 1;
     85     // 22 padding bits available
     86 
     87     HashSet<RenderObject*> m_clients;
     88     HashSet<RenderLayer*> m_clientLayers;
     89 };
     90 
     91 inline RenderSVGResourceContainer* getRenderSVGResourceContainerById(TreeScope& treeScope, const AtomicString& id)
     92 {
     93     if (id.isEmpty())
     94         return 0;
     95 
     96     if (RenderSVGResourceContainer* renderResource = treeScope.document().accessSVGExtensions().resourceById(id))
     97         return renderResource;
     98 
     99     return 0;
    100 }
    101 
    102 template<typename Renderer>
    103 Renderer* getRenderSVGResourceById(TreeScope& treeScope, const AtomicString& id)
    104 {
    105     if (RenderSVGResourceContainer* container = getRenderSVGResourceContainerById(treeScope, id))
    106         return container->cast<Renderer>();
    107 
    108     return 0;
    109 }
    110 
    111 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderSVGResourceContainer, isSVGResourceContainer());
    112 
    113 }
    114 
    115 #endif
    116