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1 // Copyright 2011 The Chromium Authors. All rights reserved. | 1 // Copyright 2011 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 #include "config.h" | 5 #include "config.h" |
6 | 6 |
7 #include "CCDelayBasedTimeSource.h" | 7 #include "cc/delay_based_time_source.h" |
| 8 |
| 9 #include <algorithm> |
8 | 10 |
9 #include "base/debug/trace_event.h" | 11 #include "base/debug/trace_event.h" |
10 #include "base/logging.h" | 12 #include "base/logging.h" |
11 #include <algorithm> | |
12 #include <wtf/CurrentTime.h> | 13 #include <wtf/CurrentTime.h> |
13 #include <wtf/MathExtras.h> | 14 #include <wtf/MathExtras.h> |
14 | 15 |
15 namespace cc { | 16 namespace cc { |
16 | 17 |
17 namespace { | 18 namespace { |
18 | 19 |
19 // doubleTickThreshold prevents ticks from running within the specified fraction
of an interval. | 20 // doubleTickThreshold prevents ticks from running within the specified fraction
of an interval. |
20 // This helps account for jitter in the timebase as well as quick timer reactiva
tion. | 21 // This helps account for jitter in the timebase as well as quick timer reactiva
tion. |
21 const double doubleTickThreshold = 0.25; | 22 const double doubleTickThreshold = 0.25; |
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222 base::TimeDelta delay = newTickTarget - now; | 223 base::TimeDelta delay = newTickTarget - now; |
223 DCHECK(delay.InMillisecondsF() <= | 224 DCHECK(delay.InMillisecondsF() <= |
224 m_nextParameters.interval.InMillisecondsF() * (1.0 + doubleTickThresh
old)); | 225 m_nextParameters.interval.InMillisecondsF() * (1.0 + doubleTickThresh
old)); |
225 m_timer.startOneShot(delay.InSecondsF()); | 226 m_timer.startOneShot(delay.InSecondsF()); |
226 | 227 |
227 m_nextParameters.tickTarget = newTickTarget; | 228 m_nextParameters.tickTarget = newTickTarget; |
228 m_currentParameters = m_nextParameters; | 229 m_currentParameters = m_nextParameters; |
229 } | 230 } |
230 | 231 |
231 } // namespace cc | 232 } // namespace cc |
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