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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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GPG key ID: B5690EEEBB952194
24 changed files with 369 additions and 187 deletions
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21
components/layout/flow/inline/line.rs
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@ -7,7 +7,6 @@ use bitflags::bitflags;
use fonts::{ByteIndex, FontMetrics, GlyphStore};
use itertools::Either;
use range::Range;
use servo_arc::Arc;
use style::Zero;
use style::computed_values::position::T as Position;
use style::computed_values::white_space_collapse::T as WhiteSpaceCollapse;
@ -21,7 +20,7 @@ use unicode_bidi::{BidiInfo, Level};
use webrender_api::FontInstanceKey;
use super::inline_box::{InlineBoxContainerState, InlineBoxIdentifier, InlineBoxTreePathToken};
use super::{InlineFormattingContextLayout, LineBlockSizes};
use super::{InlineFormattingContextLayout, LineBlockSizes, SharedInlineStyles};
use crate::cell::ArcRefCell;
use crate::fragment_tree::{BaseFragmentInfo, BoxFragment, Fragment, TextFragment};
use crate::geom::{LogicalRect, LogicalVec2, PhysicalRect, ToLogical};
@ -568,7 +567,7 @@ impl LineItemLayout<'_, '_> {
self.current_state.fragments.push((
Fragment::Text(ArcRefCell::new(TextFragment {
base: text_item.base_fragment_info.into(),
parent_style: text_item.parent_style,
inline_styles: text_item.inline_styles.clone(),
rect: PhysicalRect::zero(),
font_metrics: text_item.font_metrics,
font_key: text_item.font_key,
@ -576,7 +575,6 @@ impl LineItemLayout<'_, '_> {
text_decoration_line: text_item.text_decoration_line,
justification_adjustment: self.justification_adjustment,
selection_range: text_item.selection_range,
selected_style: text_item.selected_style,
})),
content_rect,
));
@ -763,7 +761,7 @@ impl LineItem {
pub(super) struct TextRunLineItem {
pub base_fragment_info: BaseFragmentInfo,
pub parent_style: Arc<ComputedValues>,
pub inline_styles: SharedInlineStyles,
pub text: Vec<std::sync::Arc<GlyphStore>>,
pub font_metrics: FontMetrics,
pub font_key: FontInstanceKey,
@ -771,13 +769,16 @@ pub(super) struct TextRunLineItem {
/// The BiDi level of this [`TextRunLineItem`] to enable reordering.
pub bidi_level: Level,
pub selection_range: Option<Range<ByteIndex>>,
pub selected_style: Arc<ComputedValues>,
}
impl TextRunLineItem {
fn trim_whitespace_at_end(&mut self, whitespace_trimmed: &mut Au) -> bool {
if matches!(
self.parent_style.get_inherited_text().white_space_collapse,
self.inline_styles
.style
.borrow()
.get_inherited_text()
.white_space_collapse,
WhiteSpaceCollapse::Preserve | WhiteSpaceCollapse::BreakSpaces
) {
return false;
@ -803,7 +804,11 @@ impl TextRunLineItem {
fn trim_whitespace_at_start(&mut self, whitespace_trimmed: &mut Au) -> bool {
if matches!(
self.parent_style.get_inherited_text().white_space_collapse,
self.inline_styles
.style
.borrow()
.get_inherited_text()
.white_space_collapse,
WhiteSpaceCollapse::Preserve | WhiteSpaceCollapse::BreakSpaces
) {
return false;