1 // Copyright 2013 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/gfx/ozone/dri/dri_vsync_provider.h" 6 7 #include "base/time/time.h" 8 #include "ui/gfx/ozone/dri/hardware_display_controller.h" 9 10 namespace gfx { 11 DriVSyncProvider(HardwareDisplayController * controller)12DriVSyncProvider::DriVSyncProvider(HardwareDisplayController* controller) 13 : controller_(controller) {} 14 ~DriVSyncProvider()15DriVSyncProvider::~DriVSyncProvider() {} 16 GetVSyncParameters(const UpdateVSyncCallback & callback)17void DriVSyncProvider::GetVSyncParameters(const UpdateVSyncCallback& callback) { 18 // The value is invalid, so we can't update the parameters. 19 if (controller_->get_time_of_last_flip() == 0) 20 return; 21 22 // Stores the time of the last refresh. 23 base::TimeTicks timebase = 24 base::TimeTicks::FromInternalValue(controller_->get_time_of_last_flip()); 25 // Stores the refresh rate. 26 base::TimeDelta interval = 27 base::TimeDelta::FromSeconds(1) / controller_->get_mode().vrefresh; 28 29 callback.Run(timebase, interval); 30 } 31 32 } // namespace gfx 33