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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() OVERRIDE;
     37     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) OVERRIDE FINAL;
     38 
     39     virtual bool isSVGResourceContainer() const OVERRIDE FINAL { return true; }
     40 
     41     static AffineTransform transformOnNonScalingStroke(RenderObject*, const AffineTransform& resourceTransform);
     42 
     43     void idChanged();
     44     void addClientRenderLayer(Node*);
     45     void addClientRenderLayer(RenderLayer*);
     46     void removeClientRenderLayer(RenderLayer*);
     47 
     48     void invalidateCacheAndMarkForLayout(SubtreeLayoutScope* = 0);
     49 
     50 protected:
     51     // When adding modes, make sure we don't overflow m_invalidationMask below.
     52     enum InvalidationMode {
     53         LayoutAndBoundariesInvalidation = 1 << 0,
     54         BoundariesInvalidation = 1 << 1,
     55         RepaintInvalidation = 1 << 2,
     56         ParentOnlyInvalidation = 1 << 3
     57     };
     58 
     59     // Used from the invalidateClient/invalidateClients methods from classes, inheriting from us.
     60     void markAllClientsForInvalidation(InvalidationMode);
     61     void markAllClientLayersForInvalidation();
     62     void markClientForInvalidation(RenderObject*, InvalidationMode);
     63 
     64     void clearInvalidationMask() { m_invalidationMask = 0; }
     65 
     66     static AffineTransform computeResourceSpaceTransform(RenderObject*, const AffineTransform& baseTransform, const SVGRenderStyle*, unsigned short resourceMode);
     67 
     68     bool m_isInLayout;
     69 
     70 private:
     71     friend class SVGResourcesCache;
     72     void addClient(RenderObject*);
     73     void removeClient(RenderObject*);
     74 
     75     virtual void willBeDestroyed() OVERRIDE FINAL;
     76     void registerResource();
     77 
     78     AtomicString m_id;
     79     // Track global (markAllClientsForInvalidation) invals to avoid redundant crawls.
     80     unsigned m_invalidationMask : 8;
     81 
     82     bool m_registered : 1;
     83     bool m_isInvalidating : 1;
     84     // 22 padding bits available
     85 
     86     HashSet<RenderObject*> m_clients;
     87     HashSet<RenderLayer*> m_clientLayers;
     88 };
     89 
     90 inline RenderSVGResourceContainer* getRenderSVGResourceContainerById(TreeScope& treeScope, const AtomicString& id)
     91 {
     92     if (id.isEmpty())
     93         return 0;
     94 
     95     if (RenderSVGResourceContainer* renderResource = treeScope.document().accessSVGExtensions().resourceById(id))
     96         return renderResource;
     97 
     98     return 0;
     99 }
    100 
    101 template<typename Renderer>
    102 Renderer* getRenderSVGResourceById(TreeScope& treeScope, const AtomicString& id)
    103 {
    104     if (RenderSVGResourceContainer* container = getRenderSVGResourceContainerById(treeScope, id))
    105         return container->cast<Renderer>();
    106 
    107     return 0;
    108 }
    109 
    110 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderSVGResourceContainer, isSVGResourceContainer());
    111 
    112 }
    113 
    114 #endif
    115