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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 "cc/delay_based_time_source.h" | 5 #include "cc/delay_based_time_source.h" |
6 | 6 |
7 #include <algorithm> | 7 #include <algorithm> |
8 #include <cmath> | 8 #include <cmath> |
9 | 9 |
10 #include "base/debug/trace_event.h" | 10 #include "base/debug/trace_event.h" |
11 #include "base/logging.h" | 11 #include "base/logging.h" |
12 #include "base/message_loop.h" | 12 #include "base/message_loop.h" |
13 #include "cc/thread.h" | 13 #include "cc/base/thread.h" |
14 | 14 |
15 namespace cc { | 15 namespace cc { |
16 | 16 |
17 namespace { | 17 namespace { |
18 | 18 |
19 // doubleTickThreshold prevents ticks from running within the specified fraction
of an interval. | 19 // 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. | 20 // This helps account for jitter in the timebase as well as quick timer reactiva
tion. |
21 const double doubleTickThreshold = 0.25; | 21 const double doubleTickThreshold = 0.25; |
22 | 22 |
23 // intervalChangeThreshold is the fraction of the interval that will trigger an
immediate interval change. | 23 // intervalChangeThreshold is the fraction of the interval that will trigger an
immediate interval change. |
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225 m_nextParameters.interval.InMillisecondsF() * (1.0 + doubleTickThresh
old)); | 225 m_nextParameters.interval.InMillisecondsF() * (1.0 + doubleTickThresh
old)); |
226 m_thread->postDelayedTask(base::Bind(&DelayBasedTimeSource::onTimerFired, | 226 m_thread->postDelayedTask(base::Bind(&DelayBasedTimeSource::onTimerFired, |
227 m_weakFactory.GetWeakPtr()), | 227 m_weakFactory.GetWeakPtr()), |
228 delay.InMilliseconds()); | 228 delay.InMilliseconds()); |
229 | 229 |
230 m_nextParameters.tickTarget = newTickTarget; | 230 m_nextParameters.tickTarget = newTickTarget; |
231 m_currentParameters = m_nextParameters; | 231 m_currentParameters = m_nextParameters; |
232 } | 232 } |
233 | 233 |
234 } // namespace cc | 234 } // namespace cc |
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