DOM-based SVG resource tracking

third_party/WebKit/Source/core/layout/svg/LayoutSVGResourceContainer.h

 /*
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #ifndef LayoutSVGResourceContainer_h
 #define LayoutSVGResourceContainer_h
 
 #include "core/layout/svg/LayoutSVGHiddenContainer.h"
+#include "core/svg/SVGTreeScopeResources.h"
 
 namespace blink {
 
 class SVGElementProxySet;
 
 enum LayoutSVGResourceType {
   kMaskerResourceType,
   kMarkerResourceType,
   kPatternResourceType,
   kLinearGradientResourceType,
@@ skipping 20 matching lines @@
 
   virtual LayoutSVGResourceType ResourceType() const = 0;
 
   bool IsSVGPaintServer() const {
     LayoutSVGResourceType resource_type = this->ResourceType();
     return resource_type == kPatternResourceType ||
            resource_type == kLinearGradientResourceType ||
            resource_type == kRadialGradientResourceType;
   }
 
-  void IdChanged(const AtomicString& old_id, const AtomicString& new_id);
-  void DetachAllClients(const AtomicString& to_id);
+  // Detach all clients from this resource, and add them as watches to the tree
+  // scope's resource entry (the argument.)
+  void MakeClientsPending(SVGTreeScopeResources::Resource&);
+  bool HasClients() const { return !clients_.IsEmpty(); }
 
   void InvalidateCacheAndMarkForLayout(SubtreeLayoutScope* = nullptr);
 
   static void MarkForLayoutAndParentResourceInvalidation(
       LayoutObject*,
       bool needs_layout = true);
 
   void ClearInvalidationMask() { invalidation_mask_ = 0; }
 
  protected:
@@ skipping 11 matching lines @@
   void MarkClientForInvalidation(LayoutObject*, InvalidationMode);
 
   void NotifyContentChanged();
   SVGElementProxySet* ElementProxySet();
 
   void WillBeDestroyed() override;
 
   bool is_in_layout_;
 
  private:
-  friend class SVGTreeScopeResources;
-  // The m_registered flag is updated by SVGTreeScopeResources, and indicates
-  // that this resource is the one that is resident in the id->resource map.
-  void SetRegistered(bool registered) { registered_ = registered; }
-  bool IsRegistered() const { return registered_; }
-
   friend class SVGResourcesCache;
   void AddClient(LayoutObject*);
-  void RemoveClient(LayoutObject*);
+  bool RemoveClient(LayoutObject*);
 
-  // Track global (markAllClientsForInvalidation) invals to avoid redundant
-  // crawls.
+  // Track global (markAllClientsForInvalidation) invalidations to avoid
+  // redundant crawls.
   unsigned invalidation_mask_ : 8;
 
-  unsigned registered_ : 1;
   unsigned is_invalidating_ : 1;
-  // 22 padding bits available
+  // 23 padding bits available
 
   HashSet<LayoutObject*> clients_;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutSVGResourceContainer,
                                 IsSVGResourceContainer());
 
 #define DEFINE_LAYOUT_SVG_RESOURCE_TYPE_CASTS(thisType, typeName)   \
   DEFINE_TYPE_CASTS(thisType, LayoutSVGResourceContainer, resource, \
                     resource->ResourceType() == typeName,           \
                     resource.ResourceType() == typeName)
 
 }  // namespace blink
 
 #endif