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Make fewer PositioningContexts when descending (#30061)

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When descending and we have the option, don't create new
PositioningContexts just to update the static position of laid out
abspos descendants. Instead, use the new PositioningContextLength to
only update the newly added hoisted abspos boxes.
This commit is contained in:
Martin Robinson 2023-08-03 10:51:27 +02:00 • committed by GitHub
parent 4c8db6af87
commit 1296ddf273
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GPG key ID: 4AEE18F83AFDEB23
4 changed files with 75 additions and 33 deletions
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21
components/layout_2020/flow/inline.rs
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@ -786,8 +786,7 @@ fn layout_atomic(
let margin = pbm.margin.auto_is(Length::zero);
let pbm_sums = &(&pbm.padding + &pbm.border) + &margin;
let position = style.clone_position();
let mut child_positioning_context = None;
let positioning_context_length_before_layout = ifc.positioning_context.len();
// We need to know the inline size of the atomic before deciding whether to do the line break.
let mut fragment = match atomic {
@ -854,15 +853,9 @@ fn layout_atomic(
"Mixed writing modes are not supported yet"
);
let collects_for_nearest_positioned_ancestor = ifc
.positioning_context
.collects_for_nearest_positioned_ancestor();
child_positioning_context = Some(PositioningContext::new_for_subtree(
collects_for_nearest_positioned_ancestor,
));
let independent_layout = non_replaced.layout(
layout_context,
child_positioning_context.as_mut().unwrap(),
&mut ifc.positioning_context,
&containing_block_for_children,
);
@ -916,11 +909,11 @@ fn layout_atomic(
start_corner += &relative_adjustement(atomic.style(), ifc.containing_block)
}
if let Some(mut child_positioning_context) = child_positioning_context.take() {
child_positioning_context
.adjust_static_position_of_hoisted_fragments_with_offset(&start_corner);
ifc.positioning_context.append(child_positioning_context);
}
ifc.positioning_context
.adjust_static_position_of_hoisted_fragments_with_offset(
&start_corner,
positioning_context_length_before_layout,
);
fragment.content_rect.start_corner = start_corner;