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LibWeb: Avoid some unnecessary inside layouts during intrinsic sizing

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When calculating intrinsic sizes, we don't need to recurse into *every*
box and layout its insides. IIUC, we can skip any unconstrained box with
definite sizes in both axes. So this patch does exactly that.
This commit is contained in:
Andreas Kling 2022-07-20 18:13:11 +02:00
parent 3ede8dbffb
commit 83bb16ede3
2 changed files with 16 additions and 1 deletions
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14
Userland/Libraries/LibWeb/Layout/FormattingContext.cpp
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@ -146,6 +146,20 @@ OwnPtr<FormattingContext> FormattingContext::create_independent_formatting_conte
OwnPtr<FormattingContext> FormattingContext::layout_inside(Box const& child_box, LayoutMode layout_mode)
{
{
// OPTIMIZATION: If we're doing intrinsic sizing and `child_box` has definite size in both axes,
// we don't need to layout its insides. The size is resolvable without learning
// the metrics of whatever's inside the box.
auto const& used_values = m_state.get(child_box);
if (layout_mode == LayoutMode::IntrinsicSizing
&& used_values.width_constraint == SizeConstraint::None
&& used_values.height_constraint == SizeConstraint::None
&& used_values.has_definite_width()
&& used_values.has_definite_height()) {
return nullptr;
}
}
if (!child_box.can_have_children())
return {};