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     : 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