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| 1 // Copyright (c) 2011 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 "webkit/plugins/ppapi/time_conversion.h" |
| 6 |
| 7 namespace webkit { |
| 8 namespace ppapi { |
| 9 |
| 10 namespace { |
| 11 |
| 12 // Since WebKit doesn't use ticks for event times, we have to compute what |
| 13 // the time ticks would be assuming the wall clock time doesn't change. |
| 14 // |
| 15 // This should only be used for WebKit times which we can't change the |
| 16 // definition of. |
| 17 double GetTimeToTimeTicksDeltaInSeconds() { |
| 18 static double time_to_ticks_delta_seconds = 0.0; |
| 19 if (time_to_ticks_delta_seconds == 0.0) { |
| 20 double wall_clock = TimeToPPTime(base::Time::Now()); |
| 21 double ticks = TimeTicksToPPTimeTicks(base::TimeTicks::Now()); |
| 22 time_to_ticks_delta_seconds = ticks - wall_clock; |
| 23 } |
| 24 return time_to_ticks_delta_seconds; |
| 25 } |
| 26 |
| 27 } // namespace |
| 28 |
| 29 PP_Time TimeToPPTime(base::Time t) { |
| 30 return t.ToDoubleT(); |
| 31 } |
| 32 |
| 33 base::Time PPTimeToTime(PP_Time t) { |
| 34 return base::Time::FromDoubleT(t); |
| 35 } |
| 36 |
| 37 PP_TimeTicks TimeTicksToPPTimeTicks(base::TimeTicks t) { |
| 38 return static_cast<double>(t.ToInternalValue() / |
| 39 base::Time::kMicrosecondsPerSecond); |
| 40 } |
| 41 |
| 42 PP_TimeTicks EventTimeToPPTimeTicks(double event_time) { |
| 43 return event_time + GetTimeToTimeTicksDeltaInSeconds(); |
| 44 } |
| 45 |
| 46 double PPTimeTicksToEventTime(PP_TimeTicks t) { |
| 47 return t - GetTimeToTimeTicksDeltaInSeconds(); |
| 48 } |
| 49 |
| 50 } // namespace ppapi |
| 51 } // namespace webkit |
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