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<base href="https://bugs.webkit.org/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - The animation is running in the background without stop."
href="https://bugs.webkit.org/show_bug.cgi?id=146451">146451</a>
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<th>Summary</th>
<td>The animation is running in the background without stop.
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
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<th>Product</th>
<td>WebKit
</td>
</tr>
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<th>Version</th>
<td>528+ (Nightly build)
</td>
</tr>
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<th>Hardware</th>
<td>Unspecified
</td>
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<th>OS</th>
<td>Unspecified
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>Normal
</td>
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<th>Priority</th>
<td>P2
</td>
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<th>Component</th>
<td>Animations
</td>
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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</tr>
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<th>Reporter</th>
<td>mwang@opentv.com
</td>
</tr>
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<th>CC</th>
<td>dino@apple.com
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<pre>This issue happens only if accelerated-compositing is enabled.
The attached simple test case is to load an iframe with 'display:none', which has some animations. Although nothing is displayed when it is loaded, 50% CPU is consumed (depends on different platform).
If adding a log in ImplicitAnimation::timeToNextService() of ImplicitAnimation.cpp
double ImplicitAnimation::timeToNextService()
{
printf("[LOG]ImplicitAnimation::timeToNextService(%p)\n", this);
double t = AnimationBase::timeToNextService();
......
}
Lots of logs were outputted in the console, like
[LOG]ImplicitAnimation::timeToNextService(0x726e9ec8)
[LOG]ImplicitAnimation::timeToNextService(0x726e9e70)
[LOG]ImplicitAnimation::timeToNextService(0x726e9000)
[LOG]ImplicitAnimation::timeToNextService(0x726e9058)
[LOG]ImplicitAnimation::timeToNextService(0x726e9ec8)
[LOG]ImplicitAnimation::timeToNextService(0x726e9e70)
[LOG]ImplicitAnimation::timeToNextService(0x726e9f78)
[LOG]ImplicitAnimation::timeToNextService(0x726e9f20)
[LOG]ImplicitAnimation::timeToNextService(0x726e9058)
[LOG]ImplicitAnimation::timeToNextService(0x726e9000)
How to reproduce this issue?
1/ unzip simple_case.zip
2/ enable accelerated-compositing
3/ load unzipped tbc.html
The reason is in GraphicsLayerTextureMapper::addAnimation().
This issue is the side-effect of replacing m_animationStartedTimer.startOneShot(0) by notifyChange(AnimationStarted) in GraphicsLayerTextureMapper::addAnimation(). In fact, if the current GraphicsLayerTextureMapper object is not in GraphicsLayer tree, like the iframe in the attached simple case, it's GraphicsLayerTextureMapper::commitLayerChanges() can't be triggered, so AnimationStarted event can't be dispatched into AnimationController to stop the animation timer.</pre>
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