Set up scroll and clip parents

Source/core/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 85 matching lines @@
     void updateCompositingLayers(CompositingUpdateType, RenderLayer* updateRoot = 0);
 
     // Update the compositing state of the given layer. Returns true if that state changed.
     enum CompositingChangeRepaint { CompositingChangeRepaintNow, CompositingChangeWillRepaintLater };
     bool updateLayerCompositingState(RenderLayer*, CompositingChangeRepaint = CompositingChangeRepaintNow);
 
     // Update the geometry for compositing children of compositingAncestor.
     void updateCompositingDescendantGeometry(RenderLayer* compositingAncestor, RenderLayer*, bool compositedChildrenOnly);
 
     // Whether layer's backing needs a graphics layer to do clipping by an ancestor (non-stacking-context parent with overflow).
-    bool clippedByAncestor(RenderLayer*) const;
+    bool clippedByAncestor(const RenderLayer*) const;
     // Whether layer's backing needs a graphics layer to clip z-order children of the given layer.
     bool clipsCompositingDescendants(const RenderLayer*) const;
 
     // Whether the given layer needs an extra 'contents' layer.
     bool needsContentsCompositingLayer(const RenderLayer*) const;
 
     bool supportsFixedRootBackgroundCompositing() const;
     bool needsFixedRootBackgroundLayer(const RenderLayer*) const;
     GraphicsLayer* fixedRootBackgroundLayer() const;
 
@@ skipping 118 matching lines @@
     // Repaint the given rect (which is layer's coords), and regions of child layers that intersect that rect.
     void recursiveRepaintLayer(RenderLayer*, const IntRect* = 0);
 
     void addToOverlapMap(OverlapMap&, RenderLayer*, IntRect& layerBounds, bool& boundsComputed);
     void addToOverlapMapRecursive(OverlapMap&, RenderLayer*, RenderLayer* ancestorLayer = 0);
 
     // Returns true if any layer's compositing changed
     void computeCompositingRequirements(RenderLayer* ancestorLayer, RenderLayer*, OverlapMap*, struct CompositingState&, bool& layersChanged, bool& descendantHas3DTransform, Vector<RenderLayer*>& unclippedDescendants);
 
     // Recurses down the tree, parenting descendant compositing layers and collecting an array of child layers for the current compositing layer.
-    void rebuildCompositingLayerTree(RenderLayer*, Vector<GraphicsLayer*>& childGraphicsLayersOfEnclosingLayer, int depth);
+    void rebuildCompositingLayerTree(RenderLayer*, Vector<GraphicsLayer*>& childGraphicsLayersOfEnclosingLayer, HashSet<RenderLayer*>& visited, int depth);
+
+    // Ensures that scroll parents have been processed before recurring into rebuildCompositingLayerTree for the current layer.
+    void rebuildCompositingLayerTreeForLayerAndScrollParents(RenderLayer*, Vector<GraphicsLayer*>& childGraphicsLayersOfEnclosingLayer, HashSet<RenderLayer*>& visited, HashMap<RenderLayer*, Vector<GraphicsLayer*> >& childGraphicsLayersOfScrollParents, int depth);
 
     // Recurses down the tree, updating layer geometry only.
-    void updateLayerTreeGeometry(RenderLayer*, int depth);
+    void updateLayerTreeGeometry(RenderLayer*, HashSet<RenderLayer*>& visited, int depth);
+
+    // Ensures that scroll parents have been processed before recurring into updateLayerTree for the current layer.
+    void updateLayerTreeGeometryForLayerAndScrollParents(RenderLayer*, HashSet<RenderLayer*>& visited, int depth);
 
     // Hook compositing layers together
     void setCompositingParent(RenderLayer* childLayer, RenderLayer* parentLayer);
     void removeCompositedChildren(RenderLayer*);
 
     bool layerHas3DContent(const RenderLayer*) const;
     bool isRunningAcceleratedTransformAnimation(RenderObject*) const;
 
     bool hasAnyAdditionalCompositedLayers(const RenderLayer* rootLayer) const;
 
@@ skipping 102 matching lines @@
     int m_secondaryCompositedLayerCount; // count of layers that have to be composited because of stacking or overlap.
     double m_obligatoryBackingStoreBytes;
     double m_secondaryBackingStoreBytes;
 #endif
 };
 
 
 } // namespace WebCore
 
 #endif // RenderLayerCompositor_h