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 : observer_list_(new ObserverListThreadSafe<Observer>()), 11 authoritative_vsync_interval_(base::TimeDelta::FromSeconds(0)) {} 12 13 CompositorVSyncManager::~CompositorVSyncManager() {} 14 15 void CompositorVSyncManager::SetAuthoritativeVSyncInterval( 16 base::TimeDelta interval) { 17 base::TimeTicks timebase; 18 { 19 base::AutoLock lock(vsync_parameters_lock_); 20 timebase = last_timebase_; 21 authoritative_vsync_interval_ = interval; 22 last_interval_ = interval; 23 } 24 NotifyObservers(timebase, interval); 25 } 26 27 void CompositorVSyncManager::UpdateVSyncParameters(base::TimeTicks timebase, 28 base::TimeDelta interval) { 29 { 30 base::AutoLock lock(vsync_parameters_lock_); 31 if (authoritative_vsync_interval_ != base::TimeDelta::FromSeconds(0)) 32 interval = authoritative_vsync_interval_; 33 last_timebase_ = timebase; 34 last_interval_ = interval; 35 } 36 NotifyObservers(timebase, interval); 37 } 38 39 void CompositorVSyncManager::AddObserver(Observer* observer) { 40 base::TimeTicks timebase; 41 base::TimeDelta interval; 42 { 43 base::AutoLock lock(vsync_parameters_lock_); 44 timebase = last_timebase_; 45 interval = last_interval_; 46 } 47 observer_list_->AddObserver(observer); 48 observer->OnUpdateVSyncParameters(timebase, interval); 49 } 50 51 void CompositorVSyncManager::RemoveObserver(Observer* observer) { 52 observer_list_->RemoveObserver(observer); 53 } 54 55 void CompositorVSyncManager::NotifyObservers(base::TimeTicks timebase, 56 base::TimeDelta interval) { 57 observer_list_->Notify( 58 &CompositorVSyncManager::Observer::OnUpdateVSyncParameters, 59 timebase, 60 interval); 61 } 62 63 } // namespace ui 64
