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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 "CCDelayBasedTimeSource.h" |
8 | 8 |
| 9 #include "base/logging.h" |
9 #include "TraceEvent.h" | 10 #include "TraceEvent.h" |
10 #include <algorithm> | 11 #include <algorithm> |
11 #include <wtf/CurrentTime.h> | 12 #include <wtf/CurrentTime.h> |
12 #include <wtf/MathExtras.h> | 13 #include <wtf/MathExtras.h> |
13 | 14 |
14 namespace cc { | 15 namespace cc { |
15 | 16 |
16 namespace { | 17 namespace { |
17 | 18 |
18 // 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. |
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84 return m_lastTickTime; | 85 return m_lastTickTime; |
85 } | 86 } |
86 | 87 |
87 base::TimeTicks CCDelayBasedTimeSource::nextTickTime() | 88 base::TimeTicks CCDelayBasedTimeSource::nextTickTime() |
88 { | 89 { |
89 return active() ? m_currentParameters.tickTarget : base::TimeTicks(); | 90 return active() ? m_currentParameters.tickTarget : base::TimeTicks(); |
90 } | 91 } |
91 | 92 |
92 void CCDelayBasedTimeSource::onTimerFired() | 93 void CCDelayBasedTimeSource::onTimerFired() |
93 { | 94 { |
94 ASSERT(m_state != STATE_INACTIVE); | 95 DCHECK(m_state != STATE_INACTIVE); |
95 | 96 |
96 base::TimeTicks now = this->now(); | 97 base::TimeTicks now = this->now(); |
97 m_lastTickTime = now; | 98 m_lastTickTime = now; |
98 | 99 |
99 if (m_state == STATE_STARTING) { | 100 if (m_state == STATE_STARTING) { |
100 setTimebaseAndInterval(now, m_currentParameters.interval); | 101 setTimebaseAndInterval(now, m_currentParameters.interval); |
101 m_state = STATE_ACTIVE; | 102 m_state = STATE_ACTIVE; |
102 } | 103 } |
103 | 104 |
104 postNextTickTask(now); | 105 postNextTickTask(now); |
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196 // This brings us back to 18+15 = 33, which was where we would have been if the
task hadn't been late. | 197 // This brings us back to 18+15 = 33, which was where we would have been if the
task hadn't been late. |
197 // | 198 // |
198 // For the really late delay, we we move to the next logical tick. The timebase
is not reset. | 199 // For the really late delay, we we move to the next logical tick. The timebase
is not reset. |
199 // now=37 tickTarget=16.667 newTarget=50.000 --> tick(), postDelayedTas
k(floor(50.000-37)) --> postDelayedTask(13) | 200 // now=37 tickTarget=16.667 newTarget=50.000 --> tick(), postDelayedTas
k(floor(50.000-37)) --> postDelayedTask(13) |
200 base::TimeTicks CCDelayBasedTimeSource::nextTickTarget(base::TimeTicks now) | 201 base::TimeTicks CCDelayBasedTimeSource::nextTickTarget(base::TimeTicks now) |
201 { | 202 { |
202 base::TimeDelta newInterval = m_nextParameters.interval; | 203 base::TimeDelta newInterval = m_nextParameters.interval; |
203 int intervalsElapsed = static_cast<int>(floor((now - m_nextParameters.tickTa
rget).InSecondsF() / newInterval.InSecondsF())); | 204 int intervalsElapsed = static_cast<int>(floor((now - m_nextParameters.tickTa
rget).InSecondsF() / newInterval.InSecondsF())); |
204 base::TimeTicks lastEffectiveTick = m_nextParameters.tickTarget + newInterva
l * intervalsElapsed; | 205 base::TimeTicks lastEffectiveTick = m_nextParameters.tickTarget + newInterva
l * intervalsElapsed; |
205 base::TimeTicks newTickTarget = lastEffectiveTick + newInterval; | 206 base::TimeTicks newTickTarget = lastEffectiveTick + newInterval; |
206 ASSERT(newTickTarget > now); | 207 DCHECK(newTickTarget > now); |
207 | 208 |
208 // Avoid double ticks when: | 209 // Avoid double ticks when: |
209 // 1) Turning off the timer and turning it right back on. | 210 // 1) Turning off the timer and turning it right back on. |
210 // 2) Jittery data is passed to setTimebaseAndInterval(). | 211 // 2) Jittery data is passed to setTimebaseAndInterval(). |
211 if (newTickTarget - m_lastTickTime <= newInterval / static_cast<int>(1.0 / d
oubleTickThreshold)) | 212 if (newTickTarget - m_lastTickTime <= newInterval / static_cast<int>(1.0 / d
oubleTickThreshold)) |
212 newTickTarget += newInterval; | 213 newTickTarget += newInterval; |
213 | 214 |
214 return newTickTarget; | 215 return newTickTarget; |
215 } | 216 } |
216 | 217 |
217 void CCDelayBasedTimeSource::postNextTickTask(base::TimeTicks now) | 218 void CCDelayBasedTimeSource::postNextTickTask(base::TimeTicks now) |
218 { | 219 { |
219 base::TimeTicks newTickTarget = nextTickTarget(now); | 220 base::TimeTicks newTickTarget = nextTickTarget(now); |
220 | 221 |
221 // Post another task *before* the tick and update state | 222 // Post another task *before* the tick and update state |
222 base::TimeDelta delay = newTickTarget - now; | 223 base::TimeDelta delay = newTickTarget - now; |
223 ASSERT(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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