Merge 98060 - Hidden composited iframes cause infinite loop

Source/WebCore/rendering/RenderLayerCompositor.h

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 133 matching lines @@
 
     RootLayerAttachment rootLayerAttachment() const { return m_rootLayerAttachment; }
     void updateRootLayerAttachment();
     void updateRootLayerPosition();
     
     void didMoveOnscreen();
     void willMoveOffscreen();
 
     void clearBackingForAllLayers();
     
+    void layerBecameComposited(const RenderLayer*) { ++m_compositedLayerCount; }
+    void layerBecameNonComposited(const RenderLayer*)
+    {
+        ASSERT(m_compositedLayerCount > 0);
+        --m_compositedLayerCount;
+    }
+    
     void didStartAcceleratedAnimation(CSSPropertyID);
     
 #if ENABLE(VIDEO)
     // Use by RenderVideo to ask if it should try to use accelerated compositing.
     bool canAccelerateVideoRendering(RenderVideo*) const;
 #endif
 
     // Walk the tree looking for layers with 3d transforms. Useful in case you need
     // to know if there is non-affine content, e.g. for drawing into an image.
     bool has3DContent() const;
@@ skipping 77 matching lines @@
 
     // Recurses down the tree, updating layer geometry only.
     void updateLayerTreeGeometry(RenderLayer*);
     
     // Hook compositing layers together
     void setCompositingParent(RenderLayer* childLayer, RenderLayer* parentLayer);
     void removeCompositedChildren(RenderLayer*);
 
     bool layerHas3DContent(const RenderLayer*) const;
     bool hasNonIdentity3DTransform(RenderObject*) const;
+    
+    bool hasAnyAdditionalCompositedLayers(const RenderLayer* rootLayer) const;
 
     void ensureRootLayer();
     void destroyRootLayer();
 
     void attachRootLayer(RootLayerAttachment);
     void detachRootLayer();
     
     void rootLayerAttachmentChanged();
 
     void updateOverflowControlsLayers();
@@ skipping 22 matching lines @@
 #endif
 
 private:
     RenderView* m_renderView;
     OwnPtr<GraphicsLayer> m_rootContentLayer;
     Timer<RenderLayerCompositor> m_updateCompositingLayersTimer;
 
     bool m_hasAcceleratedCompositing;
     ChromeClient::CompositingTriggerFlags m_compositingTriggers;
 
+    int m_compositedLayerCount;
     bool m_showDebugBorders;
     bool m_showRepaintCounter;
     bool m_compositingConsultsOverlap;
 
     // When true, we have to wait until layout has happened before we can decide whether to enter compositing mode,
     // because only then do we know the final size of plugins and iframes.
     // FIXME: once set, this is never cleared.
     mutable bool m_compositingDependsOnGeometry;
 
     bool m_compositing;
@@ skipping 19 matching lines @@
 #endif
 #if PROFILE_LAYER_REBUILD
     int m_rootLayerUpdateCount;
 #endif
 };
 
 
 } // namespace WebCore
 
 #endif // RenderLayerCompositor_h