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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/171702">171702</a></dd>
<dt>Author</dt> <dd>antti@apple.com</dd>
<dt>Date</dt> <dd>2014-07-28 15:18:12 -0700 (Mon, 28 Jul 2014)</dd>
</dl>
<h3>Log Message</h3>
<pre><embed> videos flashes constantly while playing inline on iPad, making it unwatchable
https://bugs.webkit.org/show_bug.cgi?id=135356
<rdar://problem/16828238>
Reviewed by Simon Fraser.
The shadow tree for media controls is scheduling style recalc. The general silliness of
HTMLPlugInImageElement::willRecalcStyle/willDetachRenderers is turning those into render
tree reconstructions causing flicker.
* html/HTMLPlugInImageElement.cpp:
(WebCore::HTMLPlugInImageElement::willRecalcStyle):
Don't do the forced renderer reconstruction if there is no style change for the element
or its ancestors. This way recalcs scheduled by the shadow tree don't trigger the widget
update code path.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceWebCoreChangeLog">trunk/Source/WebCore/ChangeLog</a></li>
<li><a href="#trunkSourceWebCorehtmlHTMLPlugInImageElementcpp">trunk/Source/WebCore/html/HTMLPlugInImageElement.cpp</a></li>
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<h3>Diff</h3>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (171701 => 171702)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog 2014-07-28 21:58:42 UTC (rev 171701)
+++ trunk/Source/WebCore/ChangeLog 2014-07-28 22:18:12 UTC (rev 171702)
</span><span class="lines">@@ -1,3 +1,22 @@
</span><ins>+2014-07-28 Antti Koivisto <antti@apple.com>
+
+ <embed> videos flashes constantly while playing inline on iPad, making it unwatchable
+ https://bugs.webkit.org/show_bug.cgi?id=135356
+ <rdar://problem/16828238>
+
+ Reviewed by Simon Fraser.
+
+ The shadow tree for media controls is scheduling style recalc. The general silliness of
+ HTMLPlugInImageElement::willRecalcStyle/willDetachRenderers is turning those into render
+ tree reconstructions causing flicker.
+
+ * html/HTMLPlugInImageElement.cpp:
+ (WebCore::HTMLPlugInImageElement::willRecalcStyle):
+
+ Don't do the forced renderer reconstruction if there is no style change for the element
+ or its ancestors. This way recalcs scheduled by the shadow tree don't trigger the widget
+ update code path.
+
</ins><span class="cx"> 2014-07-27 Brent Fulgham <bfulgham@apple.com>
</span><span class="cx">
</span><span class="cx"> [Mac, iOS] Paint-on closed captions get out-of-order in Safari
</span></span></pre></div>
<a id="trunkSourceWebCorehtmlHTMLPlugInImageElementcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/html/HTMLPlugInImageElement.cpp (171701 => 171702)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/html/HTMLPlugInImageElement.cpp 2014-07-28 21:58:42 UTC (rev 171701)
+++ trunk/Source/WebCore/html/HTMLPlugInImageElement.cpp 2014-07-28 22:18:12 UTC (rev 171702)
</span><span class="lines">@@ -223,8 +223,12 @@
</span><span class="cx"> return HTMLPlugInElement::createElementRenderer(WTF::move(style));
</span><span class="cx"> }
</span><span class="cx">
</span><del>-bool HTMLPlugInImageElement::willRecalcStyle(Style::Change)
</del><ins>+bool HTMLPlugInImageElement::willRecalcStyle(Style::Change change)
</ins><span class="cx"> {
</span><ins>+ // Make sure style recalcs scheduled by a child shadow tree don't trigger reconstruction and cause flicker.
+ if (change == Style::NoChange && styleChangeType() == NoStyleChange)
+ return true;
+
</ins><span class="cx"> // FIXME: There shoudn't be need to force render tree reconstruction here.
</span><span class="cx"> // It is only done because loading and load event dispatching is tied to render tree construction.
</span><span class="cx"> if (!useFallbackContent() && needsWidgetUpdate() && renderer() && !isImageType() && (displayState() != DisplayingSnapshot))
</span></span></pre>
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