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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/200171">200171</a></dd>
<dt>Author</dt> <dd>simon.fraser@apple.com</dd>
<dt>Date</dt> <dd>2016-04-27 22:27:01 -0700 (Wed, 27 Apr 2016)</dd>
</dl>
<h3>Log Message</h3>
<pre>SVG SMIL animations run at less than 60fps
https://bugs.webkit.org/show_bug.cgi?id=157119
rdar://problem/25971304
Reviewed by Tim Horton.
If you re-fetch current time while doing animation computations you're gonna have
a bad time.
More specifically, SMILTimeContainer::startTimer() re-fetched elapsedTime() when
computing the delay for the next timer fire, then clamped to 16.667ms, so the timer
would actually be scheduled at intervals greater than desired, causing a ~54fps framerate.
Fix by using the elapsedTime fetched at the start of animation processing.
Tested by iOS content-animation performance tests.
* svg/SVGSVGElement.cpp:
(WebCore::SVGSVGElement::SVGSVGElement): Just cleanup.
* svg/animation/SMILTimeContainer.cpp:
(WebCore::SMILTimeContainer::notifyIntervalsChanged):
(WebCore::SMILTimeContainer::resume):
(WebCore::SMILTimeContainer::startTimer):
(WebCore::SMILTimeContainer::updateAnimations):
* svg/animation/SMILTimeContainer.h:</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceWebCoreChangeLog">trunk/Source/WebCore/ChangeLog</a></li>
<li><a href="#trunkSourceWebCoresvgSVGSVGElementcpp">trunk/Source/WebCore/svg/SVGSVGElement.cpp</a></li>
<li><a href="#trunkSourceWebCoresvganimationSMILTimeContainercpp">trunk/Source/WebCore/svg/animation/SMILTimeContainer.cpp</a></li>
<li><a href="#trunkSourceWebCoresvganimationSMILTimeContainerh">trunk/Source/WebCore/svg/animation/SMILTimeContainer.h</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (200170 => 200171)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog        2016-04-28 04:57:15 UTC (rev 200170)
+++ trunk/Source/WebCore/ChangeLog        2016-04-28 05:27:01 UTC (rev 200171)
</span><span class="lines">@@ -1,3 +1,31 @@
</span><ins>+2016-04-27 Simon Fraser <simon.fraser@apple.com>
+
+ SVG SMIL animations run at less than 60fps
+ https://bugs.webkit.org/show_bug.cgi?id=157119
+ rdar://problem/25971304
+
+ Reviewed by Tim Horton.
+
+ If you re-fetch current time while doing animation computations you're gonna have
+ a bad time.
+
+ More specifically, SMILTimeContainer::startTimer() re-fetched elapsedTime() when
+ computing the delay for the next timer fire, then clamped to 16.667ms, so the timer
+ would actually be scheduled at intervals greater than desired, causing a ~54fps framerate.
+
+ Fix by using the elapsedTime fetched at the start of animation processing.
+
+ Tested by iOS content-animation performance tests.
+
+ * svg/SVGSVGElement.cpp:
+ (WebCore::SVGSVGElement::SVGSVGElement): Just cleanup.
+ * svg/animation/SMILTimeContainer.cpp:
+ (WebCore::SMILTimeContainer::notifyIntervalsChanged):
+ (WebCore::SMILTimeContainer::resume):
+ (WebCore::SMILTimeContainer::startTimer):
+ (WebCore::SMILTimeContainer::updateAnimations):
+ * svg/animation/SMILTimeContainer.h:
+
</ins><span class="cx"> 2016-04-27 Brady Eidson <beidson@apple.com>
</span><span class="cx">
</span><span class="cx"> Build fix followup to r200163
</span></span></pre></div>
<a id="trunkSourceWebCoresvgSVGSVGElementcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/svg/SVGSVGElement.cpp (200170 => 200171)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/svg/SVGSVGElement.cpp        2016-04-28 04:57:15 UTC (rev 200170)
+++ trunk/Source/WebCore/svg/SVGSVGElement.cpp        2016-04-28 05:27:01 UTC (rev 200171)
</span><span class="lines">@@ -64,7 +64,7 @@
</span><span class="cx"> , m_y(LengthModeHeight)
</span><span class="cx"> , m_width(LengthModeWidth, ASCIILiteral("100%"))
</span><span class="cx"> , m_height(LengthModeHeight, ASCIILiteral("100%"))
</span><del>- , m_timeContainer(RefPtr<SMILTimeContainer>(SMILTimeContainer::create(this)).releaseNonNull())
</del><ins>+ , m_timeContainer(SMILTimeContainer::create(this))
</ins><span class="cx"> {
</span><span class="cx"> ASSERT(hasTagName(SVGNames::svgTag));
</span><span class="cx"> registerAnimatedPropertiesForSVGSVGElement();
</span></span></pre></div>
<a id="trunkSourceWebCoresvganimationSMILTimeContainercpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/svg/animation/SMILTimeContainer.cpp (200170 => 200171)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/svg/animation/SMILTimeContainer.cpp        2016-04-28 04:57:15 UTC (rev 200170)
+++ trunk/Source/WebCore/svg/animation/SMILTimeContainer.cpp        2016-04-28 05:27:01 UTC (rev 200171)
</span><span class="lines">@@ -98,7 +98,7 @@
</span><span class="cx"> {
</span><span class="cx"> // Schedule updateAnimations() to be called asynchronously so multiple intervals
</span><span class="cx"> // can change with updateAnimations() only called once at the end.
</span><del>- startTimer(0);
</del><ins>+ startTimer(elapsed(), 0);
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> SMILTime SMILTimeContainer::elapsed() const
</span><span class="lines">@@ -159,7 +159,7 @@
</span><span class="cx">
</span><span class="cx"> m_resumeTime = monotonicallyIncreasingTime();
</span><span class="cx"> m_pauseTime = 0;
</span><del>- startTimer(0);
</del><ins>+ startTimer(elapsed(), 0);
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> void SMILTimeContainer::setElapsed(SMILTime time)
</span><span class="lines">@@ -196,7 +196,7 @@
</span><span class="cx"> updateAnimations(time, true);
</span><span class="cx"> }
</span><span class="cx">
</span><del>-void SMILTimeContainer::startTimer(SMILTime fireTime, SMILTime minimumDelay)
</del><ins>+void SMILTimeContainer::startTimer(SMILTime elapsed, SMILTime fireTime, SMILTime minimumDelay)
</ins><span class="cx"> {
</span><span class="cx"> if (!m_beginTime || isPaused())
</span><span class="cx"> return;
</span><span class="lines">@@ -204,7 +204,7 @@
</span><span class="cx"> if (!fireTime.isFinite())
</span><span class="cx"> return;
</span><span class="cx">
</span><del>- SMILTime delay = std::max(fireTime - elapsed(), minimumDelay);
</del><ins>+ SMILTime delay = std::max(fireTime - elapsed, minimumDelay);
</ins><span class="cx"> m_timer.startOneShot(delay.value());
</span><span class="cx"> }
</span><span class="cx">
</span><span class="lines">@@ -307,7 +307,7 @@
</span><span class="cx"> #ifndef NDEBUG
</span><span class="cx"> m_preventScheduledAnimationsChanges = false;
</span><span class="cx"> #endif
</span><del>- startTimer(earliestFireTime, SMILAnimationFrameDelay);
</del><ins>+ startTimer(elapsed, earliestFireTime, SMILAnimationFrameDelay);
</ins><span class="cx"> return;
</span><span class="cx"> }
</span><span class="cx">
</span><span class="lines">@@ -319,7 +319,7 @@
</span><span class="cx"> m_preventScheduledAnimationsChanges = false;
</span><span class="cx"> #endif
</span><span class="cx">
</span><del>- startTimer(earliestFireTime, SMILAnimationFrameDelay);
</del><ins>+ startTimer(elapsed, earliestFireTime, SMILAnimationFrameDelay);
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> }
</span></span></pre></div>
<a id="trunkSourceWebCoresvganimationSMILTimeContainerh"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/svg/animation/SMILTimeContainer.h (200170 => 200171)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/svg/animation/SMILTimeContainer.h        2016-04-28 04:57:15 UTC (rev 200170)
+++ trunk/Source/WebCore/svg/animation/SMILTimeContainer.h        2016-04-28 05:27:01 UTC (rev 200171)
</span><span class="lines">@@ -67,7 +67,7 @@
</span><span class="cx"> SMILTimeContainer(SVGSVGElement* owner);
</span><span class="cx">
</span><span class="cx"> void timerFired();
</span><del>- void startTimer(SMILTime fireTime, SMILTime minimumDelay = 0);
</del><ins>+ void startTimer(SMILTime elapsed, SMILTime fireTime, SMILTime minimumDelay = 0);
</ins><span class="cx"> void updateAnimations(SMILTime elapsed, bool seekToTime = false);
</span><span class="cx">
</span><span class="cx"> void updateDocumentOrderIndexes();
</span></span></pre>
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