blob: e45ffbb95aad1576c3b0f62886ab1dd460ac727e (
plain)
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
|
// Copyright 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CC_SCHEDULER_TIME_SOURCE_H_
#define CC_SCHEDULER_TIME_SOURCE_H_
#include "base/memory/ref_counted.h"
#include "base/time/time.h"
#include "cc/base/cc_export.h"
namespace cc {
class TimeSourceClient {
public:
virtual void OnTimerTick() = 0;
protected:
virtual ~TimeSourceClient() {}
};
// An generic interface for getting a reliably-ticking timesource of
// a specified rate.
//
// Be sure to call SetActive(false) before releasing your reference to the
// timer, or it will keep on ticking!
class CC_EXPORT TimeSource : public base::RefCounted<TimeSource> {
public:
virtual void SetClient(TimeSourceClient* client) = 0;
// If transitioning from not active to active, SetActive will return the
// timestamp of the most recenly missed tick that did not have OnTimerTick
// called.
virtual base::TimeTicks SetActive(bool active) = 0;
virtual bool Active() const = 0;
virtual void SetTimebaseAndInterval(base::TimeTicks timebase,
base::TimeDelta interval) = 0;
virtual base::TimeTicks LastTickTime() = 0;
virtual base::TimeTicks NextTickTime() = 0;
protected:
virtual ~TimeSource() {}
private:
friend class base::RefCounted<TimeSource>;
};
} // namespace cc
#endif // CC_SCHEDULER_TIME_SOURCE_H_
|
