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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/199004">199004</a></dd>
<dt>Author</dt> <dd>antti@apple.com</dd>
<dt>Date</dt> <dd>2016-04-04 06:40:10 -0700 (Mon, 04 Apr 2016)</dd>
</dl>
<h3>Log Message</h3>
<pre>Avoid double traversal in RenderTreeUpdater for slot roots
https://bugs.webkit.org/show_bug.cgi?id=156110
Reviewed by Andreas Kling.
* style/RenderTreeUpdater.cpp:
(WebCore::hasDisplayContents):
(WebCore::findRenderingRoot):
(WebCore::findRenderingRoots):
(WebCore::RenderTreeUpdater::commit):
If there are multiple roots that are slots we may end up updating the same rendering root multiple times.
Fix by deduplicating the roots.
(WebCore::RenderTreeUpdater::updateRenderTree):
Some cleanups.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceWebCoreChangeLog">trunk/Source/WebCore/ChangeLog</a></li>
<li><a href="#trunkSourceWebCorestyleRenderTreeUpdatercpp">trunk/Source/WebCore/style/RenderTreeUpdater.cpp</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (199003 => 199004)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog 2016-04-04 12:56:33 UTC (rev 199003)
+++ trunk/Source/WebCore/ChangeLog 2016-04-04 13:40:10 UTC (rev 199004)
</span><span class="lines">@@ -1,5 +1,25 @@
</span><span class="cx"> 2016-04-04 Antti Koivisto <antti@apple.com>
</span><span class="cx">
</span><ins>+ Avoid double traversal in RenderTreeUpdater for slot roots
+ https://bugs.webkit.org/show_bug.cgi?id=156110
+
+ Reviewed by Andreas Kling.
+
+ * style/RenderTreeUpdater.cpp:
+ (WebCore::hasDisplayContents):
+ (WebCore::findRenderingRoot):
+ (WebCore::findRenderingRoots):
+ (WebCore::RenderTreeUpdater::commit):
+
+ If there are multiple roots that are slots we may end up updating the same rendering root multiple times.
+ Fix by deduplicating the roots.
+
+ (WebCore::RenderTreeUpdater::updateRenderTree):
+
+ Some cleanups.
+
+2016-04-04 Antti Koivisto <antti@apple.com>
+
</ins><span class="cx"> Enable assertions against DOM mutations in RenderTreeUpdater
</span><span class="cx"> https://bugs.webkit.org/show_bug.cgi?id=156156
</span><span class="cx">
</span></span></pre></div>
<a id="trunkSourceWebCorestyleRenderTreeUpdatercpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/style/RenderTreeUpdater.cpp (199003 => 199004)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/style/RenderTreeUpdater.cpp 2016-04-04 12:56:33 UTC (rev 199003)
+++ trunk/Source/WebCore/style/RenderTreeUpdater.cpp 2016-04-04 13:40:10 UTC (rev 199004)
</span><span class="lines">@@ -61,19 +61,31 @@
</span><span class="cx"> {
</span><span class="cx"> }
</span><span class="cx">
</span><del>-static ContainerNode& findRenderingRoot(ContainerNode& node)
</del><ins>+static ContainerNode* findRenderingRoot(ContainerNode& node)
</ins><span class="cx"> {
</span><span class="cx"> if (node.renderer())
</span><del>- return node;
</del><ins>+ return &node;
</ins><span class="cx"> for (auto& ancestor : composedTreeAncestors(node)) {
</span><span class="cx"> if (ancestor.renderer())
</span><del>- return ancestor;
- ASSERT(hasImplicitDisplayContents(ancestor));
</del><ins>+ return &ancestor;
+ if (!hasImplicitDisplayContents(ancestor))
+ return nullptr;
</ins><span class="cx"> }
</span><del>- ASSERT_NOT_REACHED();
- return node.document();
</del><ins>+ return &node.document();
</ins><span class="cx"> }
</span><span class="cx">
</span><ins>+static ListHashSet<ContainerNode*> findRenderingRoots(const Style::Update& update)
+{
+ ListHashSet<ContainerNode*> renderingRoots;
+ for (auto* root : update.roots()) {
+ auto* renderingRoot = findRenderingRoot(*root);
+ if (!renderingRoot)
+ continue;
+ renderingRoots.add(renderingRoot);
+ }
+ return renderingRoots;
+}
+
</ins><span class="cx"> void RenderTreeUpdater::commit(std::unique_ptr<const Style::Update> styleUpdate)
</span><span class="cx"> {
</span><span class="cx"> ASSERT(&m_document == &styleUpdate->document());
</span><span class="lines">@@ -83,8 +95,8 @@
</span><span class="cx">
</span><span class="cx"> m_styleUpdate = WTFMove(styleUpdate);
</span><span class="cx">
</span><del>- for (auto* root : m_styleUpdate->roots())
- updateRenderTree(findRenderingRoot(*root));
</del><ins>+ for (auto* root : findRenderingRoots(*m_styleUpdate))
+ updateRenderTree(*root);
</ins><span class="cx">
</span><span class="cx"> m_styleUpdate = nullptr;
</span><span class="cx"> }
</span></span></pre>
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