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1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "ui/compositor/compositor_vsync_manager.h" | |
6 | |
7 namespace ui { | |
8 | |
9 CompositorVSyncManager::CompositorVSyncManager() | |
10 : authoritative_vsync_interval_(base::TimeDelta::FromSeconds(0)) { | |
11 } | |
12 | |
13 CompositorVSyncManager::~CompositorVSyncManager() {} | |
14 | |
15 void CompositorVSyncManager::SetAuthoritativeVSyncInterval( | |
16 base::TimeDelta interval) { | |
17 authoritative_vsync_interval_ = interval; | |
18 last_interval_ = interval; | |
19 NotifyObservers(last_timebase_, last_interval_); | |
20 } | |
21 | |
22 void CompositorVSyncManager::UpdateVSyncParameters(base::TimeTicks timebase, | |
23 base::TimeDelta interval) { | |
24 if (authoritative_vsync_interval_ != base::TimeDelta::FromSeconds(0)) | |
25 interval = authoritative_vsync_interval_; | |
26 last_timebase_ = timebase; | |
27 last_interval_ = interval; | |
28 NotifyObservers(timebase, interval); | |
29 } | |
30 | |
31 void CompositorVSyncManager::AddObserver(Observer* observer) { | |
32 observer_list_.AddObserver(observer); | |
33 observer->OnUpdateVSyncParameters(last_timebase_, last_interval_); | |
34 } | |
35 | |
36 void CompositorVSyncManager::RemoveObserver(Observer* observer) { | |
37 observer_list_.RemoveObserver(observer); | |
38 } | |
39 | |
40 void CompositorVSyncManager::NotifyObservers(base::TimeTicks timebase, | |
41 base::TimeDelta interval) { | |
42 FOR_EACH_OBSERVER(CompositorVSyncManager::Observer, observer_list_, | |
43 OnUpdateVSyncParameters(timebase, interval)); | |
44 } | |
45 | |
46 } // namespace ui | |
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