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layout: Share styles to inline box children via SharedInlineStyles (#36896)

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`TextRun`s use their parent style to render. Previously, these styles
were cloned and stored directly in the box tree `TextRun` and resulting
`TextFragment`s. This presents a problem for incremental layout.
Wrapping the style in another layer of shared ownership and mutability
will allow updating all `TextFragment`s during repaint-only incremental
layout by simply updating the box tree styles of the original text
parents.

This adds a new set of borrows when accessing text styles, but also
makes it so that during box tree block construction
`InlineFormattingContext`s are created lazily and now
`InlineFormattingContextBuilder::finish` consumes the builder, making
the API make a bit more sense. This should also improve performance of
box tree block construction slightly.

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>
This commit is contained in:
Martin Robinson 2025-05-12 11:38:50 +02:00 • committed by GitHub
parent db83601b62
commit a0dd2c1beb
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24 changed files with 369 additions and 187 deletions
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7
components/malloc_size_of/lib.rs
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@ -53,6 +53,7 @@ use std::ops::Range;
use std::rc::Rc;
use std::sync::Arc;
use style::properties::ComputedValues;
use style::values::generics::length::GenericLengthPercentageOrAuto;
pub use stylo_malloc_size_of::MallocSizeOfOps;
use uuid::Uuid;
@ -750,6 +751,12 @@ impl<T: MallocSizeOf> MallocSizeOf for accountable_refcell::RefCell<T> {
}
}
impl MallocSizeOf for servo_arc::Arc<ComputedValues> {
fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
self.conditional_size_of(ops)
}
}
malloc_size_of_hash_map!(indexmap::IndexMap<K, V, S>);
malloc_size_of_hash_set!(indexmap::IndexSet<T, S>);