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1 /* | 1 /* |
2 * Copyright (C) 2008 Apple Inc. All Rights Reserved. | 2 * Copyright (C) 2008 Apple Inc. All Rights Reserved. |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions | 5 * modification, are permitted provided that the following conditions |
6 * are met: | 6 * are met: |
7 * 1. Redistributions of source code must retain the above copyright | 7 * 1. Redistributions of source code must retain the above copyright |
8 * notice, this list of conditions and the following disclaimer. | 8 * notice, this list of conditions and the following disclaimer. |
9 * 2. Redistributions in binary form must reproduce the above copyright | 9 * 2. Redistributions in binary form must reproduce the above copyright |
10 * notice, this list of conditions and the following disclaimer in the | 10 * notice, this list of conditions and the following disclaimer in the |
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45 // the smallest possible interval timer. | 45 // the smallest possible interval timer. |
46 static const double minimumInterval = 0.004; | 46 static const double minimumInterval = 0.004; |
47 | 47 |
48 static inline bool shouldForwardUserGesture(int interval, int nestingLevel) | 48 static inline bool shouldForwardUserGesture(int interval, int nestingLevel) |
49 { | 49 { |
50 return UserGestureIndicator::processingUserGesture() | 50 return UserGestureIndicator::processingUserGesture() |
51 && interval <= maxIntervalForUserGestureForwarding | 51 && interval <= maxIntervalForUserGestureForwarding |
52 && nestingLevel == 1; // Gestures should not be forwarded to nested time
rs. | 52 && nestingLevel == 1; // Gestures should not be forwarded to nested time
rs. |
53 } | 53 } |
54 | 54 |
55 double DOMTimer::hiddenPageAlignmentInterval() | |
56 { | |
57 // Timers on hidden pages are aligned so that they fire once per | |
58 // second at most. | |
59 return 1.0; | |
60 } | |
61 | |
62 double DOMTimer::visiblePageAlignmentInterval() | |
63 { | |
64 // Alignment does not apply to timers on visible pages. | |
65 return 0; | |
66 } | |
67 | |
68 int DOMTimer::install(ExecutionContext* context, PassOwnPtrWillBeRawPtr<Schedule
dAction> action, int timeout, bool singleShot) | 55 int DOMTimer::install(ExecutionContext* context, PassOwnPtrWillBeRawPtr<Schedule
dAction> action, int timeout, bool singleShot) |
69 { | 56 { |
70 int timeoutID = context->timers()->installNewTimeout(context, action, timeou
t, singleShot); | 57 int timeoutID = context->timers()->installNewTimeout(context, action, timeou
t, singleShot); |
71 TRACE_EVENT_INSTANT1("devtools.timeline", "TimerInstall", TRACE_EVENT_SCOPE_
THREAD, "data", InspectorTimerInstallEvent::data(context, timeoutID, timeout, si
ngleShot)); | 58 TRACE_EVENT_INSTANT1("devtools.timeline", "TimerInstall", TRACE_EVENT_SCOPE_
THREAD, "data", InspectorTimerInstallEvent::data(context, timeoutID, timeout, si
ngleShot)); |
72 InspectorInstrumentation::didInstallTimer(context, timeoutID, timeout, singl
eShot); | 59 InspectorInstrumentation::didInstallTimer(context, timeoutID, timeout, singl
eShot); |
73 return timeoutID; | 60 return timeoutID; |
74 } | 61 } |
75 | 62 |
76 void DOMTimer::removeByID(ExecutionContext* context, int timeoutID) | 63 void DOMTimer::removeByID(ExecutionContext* context, int timeoutID) |
77 { | 64 { |
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157 | 144 |
158 void DOMTimer::stop() | 145 void DOMTimer::stop() |
159 { | 146 { |
160 SuspendableTimer::stop(); | 147 SuspendableTimer::stop(); |
161 // Need to release JS objects potentially protected by ScheduledAction | 148 // Need to release JS objects potentially protected by ScheduledAction |
162 // because they can form circular references back to the ExecutionContext | 149 // because they can form circular references back to the ExecutionContext |
163 // which will cause a memory leak. | 150 // which will cause a memory leak. |
164 m_action.clear(); | 151 m_action.clear(); |
165 } | 152 } |
166 | 153 |
167 double DOMTimer::alignedFireTime(double fireTime) const | |
168 { | |
169 double alignmentInterval = executionContext()->timerAlignmentInterval(); | |
170 if (alignmentInterval) { | |
171 double currentTime = monotonicallyIncreasingTime(); | |
172 if (fireTime <= currentTime) | |
173 return fireTime; | |
174 | |
175 // When a repeating timer is scheduled for exactly the | |
176 // background page alignment interval, because it's impossible | |
177 // for the timer to be rescheduled instantaneously, it misses | |
178 // every other fire time. Avoid this by looking at the next | |
179 // fire time rounded both down and up. | |
180 | |
181 double alignedTimeRoundedDown = floor(fireTime / alignmentInterval) * al
ignmentInterval; | |
182 double alignedTimeRoundedUp = ceil(fireTime / alignmentInterval) * align
mentInterval; | |
183 | |
184 // If the version rounded down is in the past, discard it | |
185 // immediately. | |
186 | |
187 if (alignedTimeRoundedDown <= currentTime) | |
188 return alignedTimeRoundedUp; | |
189 | |
190 // Only use the rounded-down time if it's within a certain | |
191 // tolerance of the fire time. This avoids speeding up timers | |
192 // on background pages in the common case. | |
193 | |
194 if (fireTime - alignedTimeRoundedDown < minimumInterval) | |
195 return alignedTimeRoundedDown; | |
196 | |
197 return alignedTimeRoundedUp; | |
198 } | |
199 | |
200 return fireTime; | |
201 } | |
202 | |
203 WebTaskRunner* DOMTimer::timerTaskRunner() | 154 WebTaskRunner* DOMTimer::timerTaskRunner() |
204 { | 155 { |
205 return executionContext()->timers()->timerTaskRunner(); | 156 return executionContext()->timers()->timerTaskRunner(); |
206 } | 157 } |
207 | 158 |
208 DEFINE_TRACE(DOMTimer) | 159 DEFINE_TRACE(DOMTimer) |
209 { | 160 { |
210 visitor->trace(m_action); | 161 visitor->trace(m_action); |
211 SuspendableTimer::trace(visitor); | 162 SuspendableTimer::trace(visitor); |
212 } | 163 } |
213 | 164 |
214 } // namespace blink | 165 } // namespace blink |
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