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layout: Move text decoration propagation to stacking context tree construction (#37069)

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Text decorations have a special kind of propagation. Instead of
propating these during box tree construction, move propagation to
stacking context tree construction. This will allow for using a very
easy type of incremental layout when text decorations change. For
instance, when a link changes color during hovering over it, we can skip
all of box and fragment tree construction.

In addition, propagation works a bit better now and color and style
properly move down from their originating `Fragment`s.

This introduces three new failures, because now we are drawing the
text-decoration with the correct color in more places, which exposes an
issue we have with text-decorations not being drawn in relation to the
baseline (taking into account `vertical-align`).

Testing: There are tests for these changes.
Fixes #31736.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Co-authored-by: Oriol Brufau <obrufau@igalia.com>
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Martin Robinson 2025-05-21 18:38:29 +02:00 • committed by GitHub
parent cebb1619ae
commit 9781f1241a
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23 changed files with 152 additions and 142 deletions
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4
components/layout/fragment_tree/fragment.rs
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@ -14,7 +14,6 @@ use range::Range as ServoRange;
use servo_arc::Arc as ServoArc;
use style::Zero;
use style::properties::ComputedValues;
use style::values::specified::text::TextDecorationLine;
use webrender_api::{FontInstanceKey, ImageKey};
use super::{
@ -72,9 +71,6 @@ pub(crate) struct TextFragment {
#[conditional_malloc_size_of]
pub glyphs: Vec<Arc<GlyphStore>>,
/// A flag that represents the _used_ value of the text-decoration property.
pub text_decoration_line: TextDecorationLine,
/// Extra space to add for each justification opportunity.
pub justification_adjustment: Au,
pub selection_range: Option<ServoRange<ByteIndex>>,