cc/trees/tree_synchronizer.h

   1 // Copyright 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CC_TREES_TREE_SYNCHRONIZER_H_
   6 #define CC_TREES_TREE_SYNCHRONIZER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "cc/base/cc_export.h"
  11
  12 namespace cc {
  13
  14 class LayerImpl;
  15 class LayerTreeImpl;
  16 class Layer;
  17
  18 class CC_EXPORT TreeSynchronizer {
  19  public:
  20   // Accepts a Layer tree and returns a reference to a LayerImpl tree that
  21   // duplicates the structure of the Layer tree, reusing the LayerImpls in the
  22   // tree provided by old_layer_impl_root if possible.
  23   static scoped_ptr<LayerImpl> SynchronizeTrees(
  24       Layer* layer_root,
  25       scoped_ptr<LayerImpl> old_layer_impl_root,
  26       LayerTreeImpl* tree_impl);
  27   static scoped_ptr<LayerImpl> SynchronizeTrees(
  28       LayerImpl* layer_root,
  29       scoped_ptr<LayerImpl> old_layer_impl_root,
  30       LayerTreeImpl* tree_impl);
  31
  32   // Pushes properties from a Layer or LayerImpl tree to a structurally
  33   // equivalent LayerImpl tree.
  34   static void PushProperties(Layer* layer_root,
  35                              LayerImpl* layer_impl_root);
  36   static void PushProperties(LayerImpl* layer_root, LayerImpl* layer_impl_root);
  37
  38  private:
  39   TreeSynchronizer();  // Not instantiable.
  40
  41   template <typename LayerType>
  42   static void PushPropertiesInternal(
  43       LayerType* layer,
  44       LayerImpl* layer_impl,
  45       int* num_dependents_need_push_properties_for_parent);
  46
  47   DISALLOW_COPY_AND_ASSIGN(TreeSynchronizer);
  48 };
  49
  50 }  // namespace cc
  51
  52 #endif  // CC_TREES_TREE_SYNCHRONIZER_H_