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LibWeb: Only store one DOM pointer per Layout::Node

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Instead of storing two JS::Handles into the DOM, we can combine them
into a single one.

If the layout node is anonymous, m_dom_node points to the DOM::Document.
Otherwise, m_dom_node points to the associated DOM node.

The anonymous state is moved to an m_anonymous boolean member.

This cuts the number of JS::Handles created by the layout tree in half
(and shrinks Layout::Node by 8 bytes).
This commit is contained in:
Andreas Kling 2022-10-16 16:42:39 +02:00
parent 18a5c56f14
commit be5a39657e
2 changed files with 14 additions and 10 deletions
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22
Userland/Libraries/LibWeb/Layout/Node.cpp
View file

@ -20,18 +20,18 @@
namespace Web::Layout {
Node::Node(DOM::Document& document, DOM::Node* node)
: m_document(document)
, m_dom_node(node)
: m_dom_node(node ? node : &document)
, m_anonymous(node == nullptr)
{
m_serial_id = m_document->next_layout_node_serial_id({});
m_serial_id = document.next_layout_node_serial_id({});
if (m_dom_node)
m_dom_node->set_layout_node({}, this);
if (node)
node->set_layout_node({}, this);
}
Node::~Node()
{
if (m_dom_node && m_dom_node->layout_node() == this)
if (!is_anonymous() && m_dom_node->layout_node() == this)
m_dom_node->set_layout_node({}, nullptr);
}
@ -625,27 +625,31 @@ RefPtr<Painting::Paintable> Node::create_paintable() const
bool Node::is_anonymous() const
{
return !m_dom_node.ptr();
return m_anonymous;
}
DOM::Node const* Node::dom_node() const
{
if (m_anonymous)
return nullptr;
return m_dom_node.ptr();
}
DOM::Node* Node::dom_node()
{
if (m_anonymous)
return nullptr;
return m_dom_node.ptr();
}
DOM::Document& Node::document()
{
return *m_document;
return m_dom_node->document();
}
DOM::Document const& Node::document() const
{
return *m_document;
return m_dom_node->document();
}
}