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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 TreeSynchronizer_h
#define TreeSynchronizer_h
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "cc/scoped_ptr_hash_map.h"
namespace cc {
class CCLayerImpl;
class CCLayerTreeHostImpl;
class LayerChromium;
class TreeSynchronizer {
public:
// Accepts a LayerChromium tree and returns a reference to a CCLayerImpl tree that duplicates the structure
// of the LayerChromium tree, reusing the CCLayerImpls in the tree provided by oldCCLayerImplRoot if possible.
static scoped_ptr<CCLayerImpl> synchronizeTrees(LayerChromium* layerRoot, scoped_ptr<CCLayerImpl> oldCCLayerImplRoot, CCLayerTreeHostImpl*);
private:
TreeSynchronizer(); // Not instantiable.
typedef ScopedPtrHashMap<int, CCLayerImpl> ScopedPtrCCLayerImplMap;
typedef base::hash_map<int, CCLayerImpl*> RawPtrCCLayerImplMap;
// Declared as static member functions so they can access functions on LayerChromium as a friend class.
static scoped_ptr<CCLayerImpl> reuseOrCreateCCLayerImpl(RawPtrCCLayerImplMap& newLayers, ScopedPtrCCLayerImplMap& oldLayers, LayerChromium*);
static void collectExistingCCLayerImplRecursive(ScopedPtrCCLayerImplMap& oldLayers, scoped_ptr<CCLayerImpl>);
static scoped_ptr<CCLayerImpl> synchronizeTreeRecursive(RawPtrCCLayerImplMap& newLayers, ScopedPtrCCLayerImplMap& oldLayers, LayerChromium*, CCLayerTreeHostImpl*);
static void updateScrollbarLayerPointersRecursive(const RawPtrCCLayerImplMap& newLayers, LayerChromium*);
DISALLOW_COPY_AND_ASSIGN(TreeSynchronizer);
};
} // namespace cc
#endif // TreeSynchronizer_h
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