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LibWeb: Compute StackingContext transform origin only once

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When mousing over twitter, 17% of time was spent computing stacking
context transform origins. Since this never changes after the stacking
context is created, we can cache it and avoid all that work.
This commit is contained in:
Andreas Kling 2022-09-24 20:36:06 +02:00
parent 901b80f988
commit 5c6621547c
2 changed files with 5 additions and 2 deletions
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3
Userland/Libraries/LibWeb/Painting/StackingContext.cpp
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@ -30,6 +30,7 @@ static void paint_node(Layout::Node const& layout_node, PaintContext& context, P
StackingContext::StackingContext(Layout::Box& box, StackingContext* parent)
: m_box(box)
, m_transform(combine_transformations(m_box.computed_values().transformations()))
, m_transform_origin(compute_transform_origin())
, m_parent(parent)
{
VERIFY(m_parent != this);
@ -316,7 +317,7 @@ void StackingContext::paint(PaintContext& context) const
}
}
Gfx::FloatPoint StackingContext::transform_origin() const
Gfx::FloatPoint StackingContext::compute_transform_origin() const
{
auto style_value = m_box.computed_values().transform_origin();
// FIXME: respect transform-box property