mirror of
https://github.com/servo/servo
synced 2026-05-12 01:46:28 +02:00
b285923fdc
If a box has layout damage, but the intrinsic contribution of some ancestor doesn't depend on its contents, then we don't need to clear the cached intrinsic sizes of further ancestors. Testing: No behavior change, just an optimization. It would be good to have unit tests that check we don't do unnecessary work, but leaving this for the future. Signed-off-by: Oriol Brufau <obrufau@igalia.com> Co-authored-by: Martin Robinson <mrobinson@igalia.com>
59 lines
2.1 KiB
Rust
59 lines
2.1 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 = 0b0111_1111_1111 << 4;
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/// Clear the cached inline content sizes and recompute them during the next layout.
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const RECOMPUTE_INLINE_CONTENT_SIZES = 0b1000_0000_0000 << 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 happen again.
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const REBUILD_BOX = 0b1111_1111_1111 << 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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}
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pub fn recompute_inline_content_sizes() -> RestyleDamage {
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RestyleDamage::from_bits_retain(LayoutDamage::RECOMPUTE_INLINE_CONTENT_SIZES.bits())
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}
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pub fn rebuild_box_tree() -> RestyleDamage {
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RestyleDamage::from_bits_retain(LayoutDamage::REBUILD_BOX.bits())
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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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impl From<RestyleDamage> for LayoutDamage {
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fn from(restyle_damage: RestyleDamage) -> Self {
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LayoutDamage::from_bits_retain(restyle_damage.bits())
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}
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}
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impl std::fmt::Debug for LayoutDamage {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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if self.contains(Self::REBUILD_BOX) {
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f.write_str("REBUILD_BOX")
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} else if self.contains(Self::RECOLLECT_BOX_TREE_CHILDREN) {
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f.write_str("RECOLLECT_BOX_TREE_CHILDREN")
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} else {
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f.write_str("EMPTY")
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}
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}
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}
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