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Side by Side Diff: cc/CCDelayBasedTimeSource.cpp

Issue 11048044: cc: Switch to Chromium DCHECKs and LOGs (Closed) Base URL: http://git.chromium.org/chromium/src.git@master
Patch Set: Created 8 years, 2 months ago
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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 "TraceEvent.h" 9 #include "TraceEvent.h"
10 #include <algorithm> 10 #include <algorithm>
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85 return m_lastTickTime; 85 return m_lastTickTime;
86 } 86 }
87 87
88 base::TimeTicks CCDelayBasedTimeSource::nextTickTime() 88 base::TimeTicks CCDelayBasedTimeSource::nextTickTime()
89 { 89 {
90 return active() ? m_currentParameters.tickTarget : base::TimeTicks(); 90 return active() ? m_currentParameters.tickTarget : base::TimeTicks();
91 } 91 }
92 92
93 void CCDelayBasedTimeSource::onTimerFired() 93 void CCDelayBasedTimeSource::onTimerFired()
94 { 94 {
95 ASSERT(m_state != STATE_INACTIVE); 95 DCHECK(m_state != STATE_INACTIVE);
96 96
97 base::TimeTicks now = this->now(); 97 base::TimeTicks now = this->now();
98 m_lastTickTime = now; 98 m_lastTickTime = now;
99 99
100 if (m_state == STATE_STARTING) { 100 if (m_state == STATE_STARTING) {
101 setTimebaseAndInterval(now, m_currentParameters.interval); 101 setTimebaseAndInterval(now, m_currentParameters.interval);
102 m_state = STATE_ACTIVE; 102 m_state = STATE_ACTIVE;
103 } 103 }
104 104
105 postNextTickTask(now); 105 postNextTickTask(now);
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197 // 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.
198 // 198 //
199 // 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.
200 // 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)
201 base::TimeTicks CCDelayBasedTimeSource::nextTickTarget(base::TimeTicks now) 201 base::TimeTicks CCDelayBasedTimeSource::nextTickTarget(base::TimeTicks now)
202 { 202 {
203 base::TimeDelta newInterval = m_nextParameters.interval; 203 base::TimeDelta newInterval = m_nextParameters.interval;
204 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()));
205 base::TimeTicks lastEffectiveTick = m_nextParameters.tickTarget + newInterva l * intervalsElapsed; 205 base::TimeTicks lastEffectiveTick = m_nextParameters.tickTarget + newInterva l * intervalsElapsed;
206 base::TimeTicks newTickTarget = lastEffectiveTick + newInterval; 206 base::TimeTicks newTickTarget = lastEffectiveTick + newInterval;
207 ASSERT(newTickTarget > now); 207 DCHECK(newTickTarget > now);
208 208
209 // Avoid double ticks when: 209 // Avoid double ticks when:
210 // 1) Turning off the timer and turning it right back on. 210 // 1) Turning off the timer and turning it right back on.
211 // 2) Jittery data is passed to setTimebaseAndInterval(). 211 // 2) Jittery data is passed to setTimebaseAndInterval().
212 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))
213 newTickTarget += newInterval; 213 newTickTarget += newInterval;
214 214
215 return newTickTarget; 215 return newTickTarget;
216 } 216 }
217 217
218 void CCDelayBasedTimeSource::postNextTickTask(base::TimeTicks now) 218 void CCDelayBasedTimeSource::postNextTickTask(base::TimeTicks now)
219 { 219 {
220 base::TimeTicks newTickTarget = nextTickTarget(now); 220 base::TimeTicks newTickTarget = nextTickTarget(now);
221 221
222 // Post another task *before* the tick and update state 222 // Post another task *before* the tick and update state
223 base::TimeDelta delay = newTickTarget - now; 223 base::TimeDelta delay = newTickTarget - now;
224 ASSERT(delay.InMillisecondsF() <= 224 DCHECK(delay.InMillisecondsF() <=
225 m_nextParameters.interval.InMillisecondsF() * (1.0 + doubleTickThresh old)); 225 m_nextParameters.interval.InMillisecondsF() * (1.0 + doubleTickThresh old));
226 m_timer.startOneShot(delay.InSecondsF()); 226 m_timer.startOneShot(delay.InSecondsF());
227 227
228 m_nextParameters.tickTarget = newTickTarget; 228 m_nextParameters.tickTarget = newTickTarget;
229 m_currentParameters = m_nextParameters; 229 m_currentParameters = m_nextParameters;
230 } 230 }
231 231
232 } 232 }
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