/* * Copyright (C) 2011 Google 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 * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #ifndef TreeSynchronizer_h #define TreeSynchronizer_h #include <wtf/HashMap.h> #include <wtf/Noncopyable.h> #include <wtf/PassRefPtr.h> namespace WebCore { class CCLayerImpl; class LayerChromium; class TreeSynchronizer { WTF_MAKE_NONCOPYABLE(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 PassRefPtr<CCLayerImpl> synchronizeTrees(LayerChromium* layerRoot, PassRefPtr<CCLayerImpl> oldCCLayerImplRoot); private: TreeSynchronizer(); // Not instantiable. typedef HashMap<int, RefPtr<CCLayerImpl> > CCLayerImplMap; // Declared as static member functions so they can access functions on LayerChromium as a friend class. static void addCCLayerImplsToMapRecursive(CCLayerImplMap&, CCLayerImpl*); static PassRefPtr<CCLayerImpl> synchronizeTreeRecursive(LayerChromium*, CCLayerImplMap&); }; } // namespace WebCore #endif // TreeSynchronizer_h