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// Copyright 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CC_TREE_SYNCHRONIZER_H_
#define CC_TREE_SYNCHRONIZER_H_
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "cc/cc_export.h"
#include "cc/scoped_ptr_hash_map.h"
namespace cc {
class LayerImpl;
class LayerTreeHostImpl;
class Layer;
class CC_EXPORT TreeSynchronizer {
public:
// Accepts a Layer tree and returns a reference to a LayerImpl tree that duplicates the structure
// of the Layer tree, reusing the LayerImpls in the tree provided by oldLayerImplRoot if possible.
static scoped_ptr<LayerImpl> synchronizeTrees(Layer* layerRoot, scoped_ptr<LayerImpl> oldLayerImplRoot, LayerTreeHostImpl*);
private:
TreeSynchronizer(); // Not instantiable.
typedef ScopedPtrHashMap<int, LayerImpl> ScopedPtrLayerImplMap;
typedef base::hash_map<int, LayerImpl*> RawPtrLayerImplMap;
// Declared as static member functions so they can access functions on Layer as a friend class.
static scoped_ptr<LayerImpl> reuseOrCreateLayerImpl(RawPtrLayerImplMap& newLayers, ScopedPtrLayerImplMap& oldLayers, Layer*);
static void collectExistingLayerImplRecursive(ScopedPtrLayerImplMap& oldLayers, scoped_ptr<LayerImpl>);
static scoped_ptr<LayerImpl> synchronizeTreeRecursive(RawPtrLayerImplMap& newLayers, ScopedPtrLayerImplMap& oldLayers, Layer*, LayerTreeHostImpl*);
static void updateScrollbarLayerPointersRecursive(const RawPtrLayerImplMap& newLayers, Layer*);
DISALLOW_COPY_AND_ASSIGN(TreeSynchronizer);
};
} // namespace cc
#endif // CC_TREE_SYNCHRONIZER_H_
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