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LibWeb: Limit style update tree traversal to dirty subtrees

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This patch adds a second style dirty bit that tracks whether a DOM node
has one or more children with dirty style. This allows the style update
to skip over entire subtrees where all nodes are clean.
This commit is contained in:
Andreas Kling 2020-12-14 12:04:30 +01:00
parent d1479aef56
commit 6809be436b
3 changed files with 32 additions and 7 deletions
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11
Libraries/LibWeb/DOM/Node.cpp
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@ -254,8 +254,17 @@ void Node::set_needs_style_update(bool value)
if (m_needs_style_update == value)
return;
m_needs_style_update = value;
if (m_needs_style_update)
if (m_needs_style_update) {
for (auto* ancestor = parent(); ancestor; ancestor = ancestor->parent())
ancestor->m_child_needs_style_update = true;
document().schedule_style_update();
}
}
void Node::inserted_into(Node&)
{
set_needs_style_update(true);
}
}