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6dafeb7a59
This change: - Adds a new type of LayoutDamage that signifies that a box needs its children recollected, because one or more of them need to be rebuilt. - During restyle damage propagation, propagate this new damage upward in the tree. Then box tree construction should be able to preserve any still-valid box tree nodes from box slots. - During BlockLevelBox job finalization, if a box slot is valid and there is not LayoutDamage to the element, use the old box slot, ensuring that its fragment cache is invalidated. Testing: This should not change observable behavior and thus is covered by existing WPT tests. Signed-off-by: Martin Robinson <mrobinson@igalia.com> Co-authored-by: Oriol Brufau <obrufau@igalia.com> Co-authored-by: coding-joedow <ibluegalaxy_taoj@163.com>
31 lines
1.2 KiB
Rust
31 lines
1.2 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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use bitflags::bitflags;
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use style::selector_parser::RestyleDamage;
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bitflags! {
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/// Individual layout actions that may be necessary after restyling. This is an extension
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/// of `RestyleDamage` from stylo, which only uses the 4 lower bits.
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#[derive(Clone, Copy, Default, Eq, PartialEq)]
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pub struct LayoutDamage: u16 {
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/// Recollect the box children for this element, because some of the them will be
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/// rebuilt.
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const RECOLLECT_BOX_TREE_CHILDREN = 0b011111111111 << 4;
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/// Rebuild the entire box for this element, which means that every part of layout
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/// needs to happena again.
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const REBUILD_BOX = 0b111111111111 << 4;
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}
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}
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impl LayoutDamage {
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pub fn recollect_box_tree_children() -> RestyleDamage {
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RestyleDamage::from_bits_retain(LayoutDamage::RECOLLECT_BOX_TREE_CHILDREN.bits()) |
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RestyleDamage::RELAYOUT
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}
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pub fn has_box_damage(&self) -> bool {
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self.intersects(Self::REBUILD_BOX)
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}
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}
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