Separate the geometry update from rebuilding the GraphicsLayer tree

Source/core/rendering/compositing/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 172 matching lines @@
     void setTracksRepaints(bool);
 
     void setNeedsToRecomputeCompositingRequirements() { m_needsToRecomputeCompositingRequirements = true; }
 
     virtual String debugName(const GraphicsLayer*) OVERRIDE;
 
     void updateStyleDeterminedCompositingReasons(RenderLayer*);
 
     void scheduleAnimationIfNeeded();
 
+    // Whether the layer could ever be composited.
+    bool canBeComposited(const RenderLayer*) const;
+
 private:
     class OverlapMap;
 
     enum CompositingStateTransitionType {
         NoCompositingStateChange,
         AllocateOwnCompositedLayerMapping,
         RemoveOwnCompositedLayerMapping,
         PutInSquashingLayer,
         RemoveFromSquashingLayer
     };
@@ skipping 28 matching lines @@
     bool updateLayerIfViewportConstrained(RenderLayer*);
 
     // GraphicsLayerClient implementation
     virtual void notifyAnimationStarted(const GraphicsLayer*, double) OVERRIDE { }
     virtual void paintContents(const GraphicsLayer*, GraphicsContext&, GraphicsLayerPaintingPhase, const IntRect&) OVERRIDE;
 
     virtual bool isTrackingRepaints() const OVERRIDE;
 
     // Whether the given RL needs to paint into its own separate backing (and hence would need its own CompositedLayerMapping).
     bool needsOwnBacking(const RenderLayer*) const;
-    // Whether the layer could ever be composited.
-    bool canBeComposited(const RenderLayer*) const;
 
     void updateDirectCompositingReasons(RenderLayer*);
 
     void updateIfNeeded();
 
-    // Returns indirect reasons that a layer should be composited because of something in its subtree.
-    CompositingReasons subtreeReasonsForCompositing(RenderObject*, bool hasCompositedDescendants, bool has3DTransformedDescendants) const;
-
     // Make or destroy the CompositedLayerMapping for this layer; returns true if the compositedLayerMapping changed.
     bool allocateOrClearCompositedLayerMapping(RenderLayer*, CompositingStateTransitionType compositedLayerUpdate);
     bool updateSquashingAssignment(RenderLayer*, SquashingState&, CompositingStateTransitionType compositedLayerUpdate);
 
     void recursiveRepaintLayer(RenderLayer*);
 
     void computeCompositingRequirements(RenderLayer* ancestorLayer, RenderLayer*, OverlapMap&, struct CompositingRecursionData&, bool& descendantHas3DTransform, Vector<RenderLayer*>& unclippedDescendants, IntRect& absoluteDecendantBoundingBox);
 
     // Defines which RenderLayers will paint into which composited backings, by allocating and destroying CompositedLayerMappings as needed.
     void assignLayersToBackings(RenderLayer*, bool& layersChanged);
     void assignLayersToBackingsInternal(RenderLayer*, SquashingState&, bool& layersChanged);
 
     // Hook compositing layers together
     void setCompositingParent(RenderLayer* childLayer, RenderLayer* parentLayer);
     void removeCompositedChildren(RenderLayer*);
 
-    bool isRunningAcceleratedTransformAnimation(RenderObject*) const;
-
     bool hasAnyAdditionalCompositedLayers(const RenderLayer* rootLayer) const;
 
     void ensureRootLayer();
     void destroyRootLayer();
 
     void attachRootLayer(RootLayerAttachment);
     void detachRootLayer();
 
     bool isMainFrame() const;
 
@@ skipping 59 matching lines @@
 
     // Layers for overflow controls
     OwnPtr<GraphicsLayer> m_layerForHorizontalScrollbar;
     OwnPtr<GraphicsLayer> m_layerForVerticalScrollbar;
     OwnPtr<GraphicsLayer> m_layerForScrollCorner;
 #if USE(RUBBER_BANDING)
     OwnPtr<GraphicsLayer> m_layerForOverhangShadow;
 #endif
 };
 
-
 } // namespace WebCore
 
 #endif // RenderLayerCompositor_h