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layout: Add incremental box tree construction for inline floats and abspos (#37868)

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This changes extend the incremental box tree construction for inline
out-of-flow-box, including the
`InlineItem::OutOfFlowAbsolutelyPositionedBox` and
`InlineItem::OutOfFlowFloatBox`.

Testing: This should not change observable behavior and is thus covered
by existing WPT tests.

Signed-off-by: sharpshooter_pt <ibluegalaxy_taoj@163.com>
This commit is contained in:
JoeDow 2025-07-04 22:30:00 +08:00 • committed by GitHub
parent 5eb7c397fe
commit 19ceccc8eb
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GPG key ID: B5690EEEBB952194
3 changed files with 66 additions and 28 deletions
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52
components/layout/flow/inline/construct.rs
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@ -160,19 +160,10 @@ impl InlineFormattingContextBuilder {
) -> ArcRefCell<InlineItem> {
// If there is an existing undamaged layout box that's compatible, use that.
let independent_formatting_context = old_layout_box
.and_then(|layout_box| {
let LayoutBox::InlineLevel(inline_level_boxes) = layout_box else {
return None;
};
// If there's an existing box, it should be a compatible atomic inline and should
// not have been subject to inline-block splitting.
assert_eq!(inline_level_boxes.len(), 1);
let first_box = inline_level_boxes.into_iter().next()?;
match &*first_box.borrow() {
InlineItem::Atomic(atomic, ..) => Some(atomic.clone()),
_ => None,
}
.and_then(LayoutBox::unsplit_inline_level_layout_box)
.and_then(|inline_item| match &*inline_item.borrow() {
InlineItem::Atomic(atomic, ..) => Some(atomic.clone()),
_ => None,
})
.unwrap_or_else(independent_formatting_context_creator);
@ -195,9 +186,20 @@ impl InlineFormattingContextBuilder {
pub(crate) fn push_absolutely_positioned_box(
&mut self,
absolutely_positioned_box: AbsolutelyPositionedBox,
absolutely_positioned_box_creator: impl FnOnce() -> ArcRefCell<AbsolutelyPositionedBox>,
old_layout_box: Option<LayoutBox>,
) -> ArcRefCell<InlineItem> {
let absolutely_positioned_box = ArcRefCell::new(absolutely_positioned_box);
let absolutely_positioned_box = old_layout_box
.and_then(LayoutBox::unsplit_inline_level_layout_box)
.and_then(|inline_item| match &*inline_item.borrow() {
InlineItem::OutOfFlowAbsolutelyPositionedBox(positioned_box, ..) => {
Some(positioned_box.clone())
},
_ => None,
})
.unwrap_or_else(absolutely_positioned_box_creator);
// We cannot just reuse the old inline item, because the `current_text_offset` may have changed.
let inline_level_box = ArcRefCell::new(InlineItem::OutOfFlowAbsolutelyPositionedBox(
absolutely_positioned_box,
self.current_text_offset,
@ -207,9 +209,23 @@ impl InlineFormattingContextBuilder {
inline_level_box
}
pub(crate) fn push_float_box(&mut self, float_box: FloatBox) -> ArcRefCell<InlineItem> {
let inline_level_box =
ArcRefCell::new(InlineItem::OutOfFlowFloatBox(ArcRefCell::new(float_box)));
pub(crate) fn push_float_box(
&mut self,
float_box_creator: impl FnOnce() -> ArcRefCell<FloatBox>,
old_layout_box: Option<LayoutBox>,
) -> ArcRefCell<InlineItem> {
let inline_level_box = old_layout_box
.and_then(LayoutBox::unsplit_inline_level_layout_box)
.unwrap_or_else(|| ArcRefCell::new(InlineItem::OutOfFlowFloatBox(float_box_creator())));
debug_assert!(
matches!(
&*inline_level_box.borrow(),
InlineItem::OutOfFlowFloatBox(..),
),
"Created float box with incompatible `old_layout_box`"
);
self.inline_items.push(inline_level_box.clone());
self.contains_floats = true;
inline_level_box