1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
/*
* 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 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 CCDelayBasedTimeSource_h
#define CCDelayBasedTimeSource_h
#include "cc/CCTimeSource.h"
#include <wtf/PassRefPtr.h>
namespace WebCore {
class CCThread;
// This timer implements a time source that achieves the specified interval
// in face of millisecond-precision delayed callbacks and random queueing delays.
class CCDelayBasedTimeSource : public CCTimeSource {
public:
static PassRefPtr<CCDelayBasedTimeSource> create(double intervalMs, CCThread*);
virtual ~CCDelayBasedTimeSource() { }
virtual void setClient(CCTimeSourceClient* client) { m_client = client; }
virtual void setActive(bool);
// Virtual for testing.
virtual double monotonicallyIncreasingTimeMs() const;
protected:
CCDelayBasedTimeSource(double intervalMs, CCThread*);
void onTick();
void updateState();
void postTickTask(long long delay);
enum State {
STATE_INACTIVE,
STATE_STARTING,
STATE_ACTIVE,
};
CCTimeSourceClient* m_client;
double m_intervalMs;
double m_tickTarget;
State m_state;
CCThread* m_thread;
};
}
#endif // CCDelayBasedTimeSource_h
|
