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layout: Move BoxFragment's block-level info into a dedicated struct (#37938)

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`BoxFragment` had 2 fields that are only relevant for block-level boxes:
`clearance` and a boxed `block_margins_collapsed_with_children`.

This moves both pieces of data into a new `BlockLevelLayoutInfo` struct,
which is boxed.

As a result, the size of `BoxFragment` is reduced from 272 to 264 bytes.

Testing: Unneeded (no behavior change)

Signed-off-by: Oriol Brufau <obrufau@igalia.com>
This commit is contained in:
Oriol Brufau 2025-07-09 17:04:57 +02:00 • committed by GitHub
parent 26f4da8249
commit d2ccf419c3
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GPG key ID: B5690EEEBB952194
2 changed files with 37 additions and 37 deletions
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21
components/layout/flow/mod.rs
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@ -32,7 +32,8 @@ use crate::formatting_contexts::{
Baselines, IndependentFormattingContext, IndependentFormattingContextContents,
};
use crate::fragment_tree::{
BaseFragmentInfo, BoxFragment, CollapsedBlockMargins, CollapsedMargin, Fragment, FragmentFlags,
BaseFragmentInfo, BlockLevelLayoutInfo, BoxFragment, CollapsedBlockMargins, CollapsedMargin,
Fragment, FragmentFlags,
};
use crate::geom::{
AuOrAuto, LazySize, LogicalRect, LogicalSides, LogicalSides1D, LogicalVec2, PhysicalPoint,
@ -1175,8 +1176,7 @@ fn layout_in_flow_non_replaced_block_level_same_formatting_context(
flow_layout.specific_layout_info,
)
.with_baselines(flow_layout.baselines)
.with_block_margins_collapsed_with_children(block_margins_collapsed_with_children)
.with_clearance(clearance)
.with_block_level_layout_info(block_margins_collapsed_with_children, clearance)
}
impl IndependentFormattingContext {
@ -1288,7 +1288,7 @@ impl IndependentFormattingContext {
layout.specific_layout_info,
)
.with_baselines(layout.baselines)
.with_block_margins_collapsed_with_children(block_margins_collapsed_with_children)
.with_block_level_layout_info(block_margins_collapsed_with_children, None)
}
/// Lay out a normal in flow non-replaced block that establishes an independent
@ -1605,8 +1605,7 @@ impl IndependentFormattingContext {
layout.specific_layout_info,
)
.with_baselines(layout.baselines)
.with_block_margins_collapsed_with_children(CollapsedBlockMargins::from_margin(&margin))
.with_clearance(clearance)
.with_block_level_layout_info(CollapsedBlockMargins::from_margin(&margin), clearance)
}
}
@ -2076,7 +2075,13 @@ impl<'container> PlacementState<'container> {
return;
}
let fragment_block_margins = fragment.block_margins_collapsed_with_children();
let BlockLevelLayoutInfo {
clearance,
block_margins_collapsed_with_children: fragment_block_margins,
} = &**fragment
.block_level_layout_info
.as_ref()
.expect("A block-level fragment should have a BlockLevelLayoutInfo.");
let mut fragment_block_size = fragment
.border_rect()
.size
@ -2088,7 +2093,7 @@ impl<'container> PlacementState<'container> {
// > If the top and bottom margins of an element with clearance are adjoining,
// > its margins collapse with the adjoining margins of following siblings but that
// > resulting margin does not collapse with the bottom margin of the parent block.
if let Some(clearance) = fragment.clearance {
if let Some(clearance) = *clearance {
fragment_block_size += clearance;
// Margins can't be adjoining if they are separated by clearance.
// Setting `next_in_flow_margin_collapses_with_parent_start_margin` to false