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#ifndef UI_GFX_FRAME_TIME_H
6#define UI_GFX_FRAME_TIME_H
7
8#include "base/time/time.h"
9#include "base/logging.h"
10
11namespace gfx {
12
13// FrameTime::Now() should be used to get timestamps with a timebase that
14// is consistent across the graphics stack.
15class FrameTime {
16 public:
17  static base::TimeTicks Now() {
18    if (TimestampsAreHighRes())
19      return base::TimeTicks::HighResNow();
20    return base::TimeTicks::Now();
21  }
22
23#if defined(OS_WIN)
24  static base::TimeTicks FromQPCValue(LONGLONG qpc_value) {
25    DCHECK(TimestampsAreHighRes());
26    return base::TimeTicks::FromQPCValue(qpc_value);
27  }
28#endif
29
30  static bool TimestampsAreHighRes() {
31    // This should really return base::TimeTicks::IsHighResNowFastAndReliable();
32    // Returning false makes sure we are only using low-res timestamps until we
33    // use FrameTime everywhere we need to. See crbug.com/315334
34    return false;
35  }
36};
37
38}
39
40#endif // UI_GFX_FRAME_TIME_H
41