/*
 * Copyright (C) 2011 Apple 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 INC. 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 INC. 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 LayerTreeContext_h
#define LayerTreeContext_h

namespace CoreIPC {
    class ArgumentDecoder;
    class ArgumentEncoder;
}

namespace WebKit {

class LayerTreeContext {
public:
    LayerTreeContext();
    ~LayerTreeContext();

    void encode(CoreIPC::ArgumentEncoder*) const;
    static bool decode(CoreIPC::ArgumentDecoder*, LayerTreeContext&);

    bool isEmpty() const;

#if PLATFORM(MAC)
    uint32_t contextID;
#elif PLATFORM(WIN)
    HWND window;
#elif PLATFORM(QT)
    uint32_t webLayerID;
#endif
};

bool operator==(const LayerTreeContext&, const LayerTreeContext&);

inline bool operator!=(const LayerTreeContext& a, const LayerTreeContext& b)
{
    return !(a == b);
}

};

#endif // LayerTreeContext_h
