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/dri_window_delegate.h" 9 #include "ui/ozone/platform/dri/hardware_display_controller.h" 10 11 namespace ui { 12 DriVSyncProvider(DriWindowDelegate * window_delegate)13DriVSyncProvider::DriVSyncProvider(DriWindowDelegate* window_delegate) 14 : window_delegate_(window_delegate) { 15 } 16 ~DriVSyncProvider()17DriVSyncProvider::~DriVSyncProvider() {} 18 GetVSyncParameters(const UpdateVSyncCallback & callback)19void DriVSyncProvider::GetVSyncParameters(const UpdateVSyncCallback& callback) { 20 HardwareDisplayController* controller = window_delegate_->GetController(); 21 if (!controller) 22 return; 23 24 // The value is invalid, so we can't update the parameters. 25 if (controller->get_time_of_last_flip() == 0 || 26 controller->get_mode().vrefresh == 0) 27 return; 28 29 // Stores the time of the last refresh. 30 base::TimeTicks timebase = 31 base::TimeTicks::FromInternalValue(controller->get_time_of_last_flip()); 32 // Stores the refresh rate. 33 base::TimeDelta interval = 34 base::TimeDelta::FromSeconds(1) / controller->get_mode().vrefresh; 35 36 callback.Run(timebase, interval); 37 } 38 39 } // namespace ui 40