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1 // Copyright 2013 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef UI_GFX_FRAME_TIME_H | 5 #ifndef UI_GFX_FRAME_TIME_H |
6 #define UI_GFX_FRAME_TIME_H | 6 #define UI_GFX_FRAME_TIME_H |
7 | 7 |
8 #include "base/time/time.h" | 8 #include "base/time/time.h" |
9 #include "base/logging.h" | 9 #include "base/logging.h" |
10 | 10 |
11 namespace gfx { | 11 namespace gfx { |
12 | 12 |
13 // FrameTime::Now() should be used to get timestamps with a timebase that | 13 // FrameTime::Now() should be used to get timestamps with a timebase that |
14 // is consistent across the graphics stack. | 14 // is consistent across the graphics stack. |
15 class FrameTime { | 15 class FrameTime { |
16 public: | 16 public: |
17 static base::TimeTicks Now() { | 17 static base::TimeTicks Now() { |
18 if (TimestampsAreHighRes()) | |
19 return base::TimeTicks::HighResNow(); | |
20 return base::TimeTicks::Now(); | 18 return base::TimeTicks::Now(); |
21 } | 19 } |
22 | 20 |
23 #if defined(OS_WIN) | 21 #if defined(OS_WIN) |
24 static base::TimeTicks FromQPCValue(LONGLONG qpc_value) { | 22 static base::TimeTicks FromQPCValue(LONGLONG qpc_value) { |
25 DCHECK(TimestampsAreHighRes()); | 23 DCHECK(TimestampsAreHighRes()); |
26 return base::TimeTicks::FromQPCValue(qpc_value); | 24 return base::TimeTicks::FromQPCValue(qpc_value); |
27 } | 25 } |
28 #endif | 26 #endif |
29 | 27 |
30 static bool TimestampsAreHighRes() { | 28 static bool TimestampsAreHighRes() { |
31 #if defined(OS_WIN) | 29 #if defined(OS_WIN) |
32 return base::TimeTicks::IsHighResClockWorking(); | 30 return base::TimeTicks::IsHighResolution(); |
33 #else | 31 #else |
| 32 // TODO(miu): Mac/Linux always provide high-resolution timestamps. Consider |
| 33 // returning base::TimeTicks::IsHighResolution() for all platforms. |
34 return false; | 34 return false; |
35 #endif | 35 #endif |
36 } | 36 } |
37 }; | 37 }; |
38 | 38 |
39 } | 39 } |
40 | 40 |
41 #endif // UI_GFX_FRAME_TIME_H | 41 #endif // UI_GFX_FRAME_TIME_H |
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