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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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components/layout_2020/flexbox/layout.rs
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@ -947,7 +947,7 @@ impl FlexContainer {
// per flex item, in the original order.
let (fragment, mut child_positioning_context) =
flex_item_fragments.next().unwrap();
let fragment = Fragment::Box(fragment);
let fragment = Fragment::Box(ArcRefCell::new(fragment));
child_positioning_context.adjust_static_position_of_hoisted_fragments(
&fragment,
PositioningContextLength::zero(),