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// Copyright 2014 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.
#include "ui/compositor/compositor_vsync_manager.h"
namespace ui {
CompositorVSyncManager::CompositorVSyncManager()
: observer_list_(new ObserverListThreadSafe<Observer>()),
authoritative_vsync_interval_(base::TimeDelta::FromSeconds(0)) {}
CompositorVSyncManager::~CompositorVSyncManager() {}
void CompositorVSyncManager::SetAuthoritativeVSyncInterval(
base::TimeDelta interval) {
base::TimeTicks timebase;
{
base::AutoLock lock(vsync_parameters_lock_);
timebase = last_timebase_;
authoritative_vsync_interval_ = interval;
last_interval_ = interval;
}
NotifyObservers(timebase, interval);
}
void CompositorVSyncManager::UpdateVSyncParameters(base::TimeTicks timebase,
base::TimeDelta interval) {
{
base::AutoLock lock(vsync_parameters_lock_);
if (authoritative_vsync_interval_ != base::TimeDelta::FromSeconds(0))
interval = authoritative_vsync_interval_;
last_timebase_ = timebase;
last_interval_ = interval;
}
NotifyObservers(timebase, interval);
}
void CompositorVSyncManager::AddObserver(Observer* observer) {
base::TimeTicks timebase;
base::TimeDelta interval;
{
base::AutoLock lock(vsync_parameters_lock_);
timebase = last_timebase_;
interval = last_interval_;
}
observer_list_->AddObserver(observer);
observer->OnUpdateVSyncParameters(timebase, interval);
}
void CompositorVSyncManager::RemoveObserver(Observer* observer) {
observer_list_->RemoveObserver(observer);
}
void CompositorVSyncManager::NotifyObservers(base::TimeTicks timebase,
base::TimeDelta interval) {
observer_list_->Notify(
&CompositorVSyncManager::Observer::OnUpdateVSyncParameters,
timebase,
interval);
}
} // namespace ui
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