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LibWeb: Cache the used CSS 'position' value on LayoutNodeWithStyle

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This avoids having to query the StyleProperties hash map whenever we
need to know if an element is absolutely positioned. This was extremely
hot in interactive window resize profiles.
This commit is contained in:
Andreas Kling 2020-06-23 23:15:23 +02:00
parent d0312f6208
commit 9b8464f455
4 changed files with 27 additions and 12 deletions
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17
Libraries/LibWeb/Layout/LayoutNode.cpp
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@ -57,7 +57,7 @@ void LayoutNode::layout(LayoutMode layout_mode)
bool LayoutNode::can_contain_boxes_with_position_absolute() const
{
return style().position() != CSS::Position::Static || is_root();
return position() != CSS::Position::Static || is_root();
}
const LayoutBlock* LayoutNode::containing_block() const
@ -72,7 +72,7 @@ const LayoutBlock* LayoutNode::containing_block() const
if (is_text())
return nearest_block_ancestor();
auto position = style().position();
auto position = this->position();
if (position == CSS::Position::Absolute) {
auto* ancestor = parent();
@ -199,7 +199,7 @@ bool LayoutNode::is_absolutely_positioned() const
{
if (!has_style())
return false;
auto position = style().position();
auto position = this->position();
return position == CSS::Position::Absolute || position == CSS::Position::Fixed;
}
@ -207,7 +207,16 @@ bool LayoutNode::is_fixed_position() const
{
if (!has_style())
return false;
return style().position() == CSS::Position::Fixed;
auto position = this->position();
return position == CSS::Position::Fixed;
}
LayoutNodeWithStyle::LayoutNodeWithStyle(const Node* node, NonnullRefPtr<StyleProperties> style)
: LayoutNode(node)
, m_style(move(style))
{
m_has_style = true;
m_position = m_style->position();
}
}