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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/fragment_tree/base_fragment.rs
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@ -13,7 +13,7 @@ use crate::layout_debug::DebugId;
/// This data structure stores fields that are common to all non-base
/// Fragment types and should generally be the first member of all
/// concrete fragments.
#[derive(Debug, Serialize)]
#[derive(Clone, Debug, Serialize)]
pub(crate) struct BaseFragment {
/// A tag which identifies the DOM node and pseudo element of this
/// Fragment's content. If this fragment isn't related to any DOM