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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_TREES_TREE_SYNCHRONIZER_H_
#define CC_TREES_TREE_SYNCHRONIZER_H_
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "cc/base/cc_export.h"
namespace cc {
class LayerImpl;
class LayerTreeImpl;
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 old_layer_impl_root if possible.
static scoped_ptr<LayerImpl> SynchronizeTrees(
Layer* layer_root,
scoped_ptr<LayerImpl> old_layer_impl_root,
LayerTreeImpl* tree_impl);
static scoped_ptr<LayerImpl> SynchronizeTrees(
LayerImpl* layer_root,
scoped_ptr<LayerImpl> old_layer_impl_root,
LayerTreeImpl* tree_impl);
// Pushes properties from a Layer or LayerImpl tree to a structurally
// equivalent LayerImpl tree.
static void PushProperties(Layer* layer_root,
LayerImpl* layer_impl_root);
static void PushProperties(LayerImpl* layer_root, LayerImpl* layer_impl_root);
private:
TreeSynchronizer(); // Not instantiable.
static void SetNumDependentsNeedPushProperties(Layer* layer, size_t num);
static void SetNumDependentsNeedPushProperties(LayerImpl* layer, size_t num);
template <typename LayerType>
static void PushPropertiesInternal(
LayerType* layer,
LayerImpl* layer_impl,
size_t* num_dependents_need_push_properties_for_parent);
DISALLOW_COPY_AND_ASSIGN(TreeSynchronizer);
};
} // namespace cc
#endif // CC_TREES_TREE_SYNCHRONIZER_H_
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