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 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#include <windows.h>
30#include <wtf/HashSet.h>
31#include <wtf/Noncopyable.h>
32
33namespace WebCore {
34
35class AbstractCACFLayerTreeHost;
36
37class LayerChangesFlusher {
38    WTF_MAKE_NONCOPYABLE(LayerChangesFlusher);
39public:
40    static LayerChangesFlusher& shared();
41
42    void flushPendingLayerChangesSoon(AbstractCACFLayerTreeHost*);
43    void cancelPendingFlush(AbstractCACFLayerTreeHost*);
44
45private:
46    LayerChangesFlusher();
47    ~LayerChangesFlusher();
48
49    static LRESULT CALLBACK hookCallback(int code, WPARAM, LPARAM);
50    LRESULT hookFired(int code, WPARAM, LPARAM);
51    void setHook();
52    void removeHook();
53
54    HashSet<AbstractCACFLayerTreeHost*> m_hostsWithChangesToFlush;
55    HHOOK m_hook;
56    bool m_isCallingHosts;
57};
58
59} // namespace WebCore
60
61#endif // LayerChangesFlusher_h
62