src/ui/compositor/compositor_vsync_manager.cc

   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