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/ozone/platform/dri/dri_vsync_provider.h" 6 7#include "base/time/time.h" 8#include "ui/ozone/platform/dri/hardware_display_controller.h" 9 10namespace ui { 11 12DriVSyncProvider::DriVSyncProvider( 13 const base::WeakPtr<HardwareDisplayController>& controller) 14 : controller_(controller) { 15} 16 17DriVSyncProvider::~DriVSyncProvider() {} 18 19void DriVSyncProvider::GetVSyncParameters(const UpdateVSyncCallback& callback) { 20 if (!controller_) 21 return; 22 23 // The value is invalid, so we can't update the parameters. 24 if (controller_->get_time_of_last_flip() == 0 || 25 controller_->get_mode().vrefresh == 0) 26 return; 27 28 // Stores the time of the last refresh. 29 base::TimeTicks timebase = 30 base::TimeTicks::FromInternalValue(controller_->get_time_of_last_flip()); 31 // Stores the refresh rate. 32 base::TimeDelta interval = 33 base::TimeDelta::FromSeconds(1) / controller_->get_mode().vrefresh; 34 35 callback.Run(timebase, interval); 36} 37 38} // namespace ui 39