1/*
2 * Copyright (C) 2011 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef LayerChangesFlusher_h
27#define LayerChangesFlusher_h
28
29#if USE(ACCELERATED_COMPOSITING)
30
31#include <windows.h>
32#include <wtf/HashSet.h>
33#include <wtf/Noncopyable.h>
34
35namespace WebCore {
36
37class AbstractCACFLayerTreeHost;
38
39class LayerChangesFlusher {
40    WTF_MAKE_NONCOPYABLE(LayerChangesFlusher);
41public:
42    static LayerChangesFlusher& shared();
43
44    void flushPendingLayerChangesSoon(AbstractCACFLayerTreeHost*);
45    void cancelPendingFlush(AbstractCACFLayerTreeHost*);
46
47private:
48    LayerChangesFlusher();
49    ~LayerChangesFlusher();
50
51    static LRESULT CALLBACK hookCallback(int code, WPARAM, LPARAM);
52    LRESULT hookFired(int code, WPARAM, LPARAM);
53    void setHook();
54    void removeHook();
55
56    HashSet<AbstractCACFLayerTreeHost*> m_hostsWithChangesToFlush;
57    HHOOK m_hook;
58    bool m_isCallingHosts;
59};
60
61} // namespace WebCore
62
63#endif // USE(ACCELERATED_COMPOSITING)
64
65#endif // LayerChangesFlusher_h
66