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layout: Make Fragment hold ArcRefCell inside (#34923)

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Push the interior mutability into enum variants of `Fragment`, so that
they can be cloned. This saves memory in the `Fragment` tree as the
`Fragment` enum is now a relatively wee 16 bytes and the interior parts
can be a variety of sizes. Before, every `Fragment` was the size of the
biggest kind (`BoxFragment` - 248 bytes).

This a step on the way toward incremental layout.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Co-authored-by: Oriol Brufau <obrufau@igalia.com>
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Martin Robinson 2025-01-13 10:59:59 +01:00 • committed by GitHub
parent c936dd6c4e
commit de780dcde4
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18 changed files with 257 additions and 233 deletions
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4
components/layout_2020/taffy/layout.rs
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@ -551,7 +551,7 @@ impl TaffyContainer {
match &mut child.taffy_level_box {
TaffyItemBoxInner::InFlowBox(independent_box) => {
let fragment = Fragment::Box(
let fragment = Fragment::Box(ArcRefCell::new(
BoxFragment::new(
independent_box.base_fragment_info(),
independent_box.style().clone(),
@ -568,7 +568,7 @@ impl TaffyContainer {
last: None,
})
.with_detailed_layout_info(child_detailed_layout_info),
);
));
child
.positioning_context