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layout: Count word separators as justification opportunities when trimming whitespace (#31161)

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Before counting whitepsace-only `GlyphStore`s where counted as a single
justification opportunity when trimming whitespace from the front and
back of lines. This isn't correct, instead count the actual number of
word seperators of the trimmed `GlyphStore`s.

These two counts can be different in the case where whitespace collapse
isn't happening yet (flexbox). In addition, using word seperators means
the code is making less assumptions about the contents of the line and
is more robust.

This fixes some crashes in flexbox tests on debug builds.

Co-authored-by: Rakhi Sharma <atbrakhi@igalia.com>
This commit is contained in:
Martin Robinson 2024-01-23 12:47:13 +01:00 • committed by GitHub
parent 1d67aa44ca
commit 7de0486e2e
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GPG key ID: B5690EEEBB952194
3 changed files with 25 additions and 19 deletions
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24
components/layout_2020/flow/line.rs
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@ -120,11 +120,11 @@ impl LineItem {
pub(super) fn trim_whitespace_at_end(
&mut self,
whitespace_trimmed: &mut Length,
spaces_trimmed: &mut usize,
word_seperators_trimmed: &mut usize,
) -> bool {
match self {
LineItem::TextRun(ref mut item) => {
item.trim_whitespace_at_end(whitespace_trimmed, spaces_trimmed)
item.trim_whitespace_at_end(whitespace_trimmed, word_seperators_trimmed)
},
LineItem::StartInlineBox(_) => true,
LineItem::EndInlineBox => true,
@ -137,11 +137,11 @@ impl LineItem {
pub(super) fn trim_whitespace_at_start(
&mut self,
whitespace_trimmed: &mut Length,
spaces_trimmed: &mut usize,
word_separators_trimmed: &mut usize,
) -> bool {
match self {
LineItem::TextRun(ref mut item) => {
item.trim_whitespace_at_start(whitespace_trimmed, spaces_trimmed)
item.trim_whitespace_at_start(whitespace_trimmed, word_separators_trimmed)
},
LineItem::StartInlineBox(_) => true,
LineItem::EndInlineBox => true,
@ -165,7 +165,7 @@ impl TextRunLineItem {
fn trim_whitespace_at_end(
&mut self,
whitespace_trimmed: &mut Length,
spaces_trimmed: &mut usize,
word_seperators_trimmed: &mut usize,
) -> bool {
if self
.parent_style
@ -184,11 +184,13 @@ impl TextRunLineItem {
.map(|offset_from_end| self.text.len() - offset_from_end);
let first_whitespace_index = index_of_last_non_whitespace.unwrap_or(0);
*spaces_trimmed += self.text.len() - first_whitespace_index;
*whitespace_trimmed += self
.text
.drain(first_whitespace_index..)
.map(|glyph| Length::from(glyph.total_advance()))
.map(|glyph| {
*word_seperators_trimmed += glyph.total_word_separators();
Length::from(glyph.total_advance())
})
.sum();
// Only keep going if we only encountered whitespace.
@ -198,7 +200,7 @@ impl TextRunLineItem {
fn trim_whitespace_at_start(
&mut self,
whitespace_trimmed: &mut Length,
spaces_trimmed: &mut usize,
word_separators_trimmed: &mut usize,
) -> bool {
if self
.parent_style
@ -215,11 +217,13 @@ impl TextRunLineItem {
.position(|glyph| !glyph.is_whitespace())
.unwrap_or(self.text.len());
*spaces_trimmed += index_of_first_non_whitespace;
*whitespace_trimmed += self
.text
.drain(0..index_of_first_non_whitespace)
.map(|glyph| Length::from(glyph.total_advance()))
.map(|glyph| {
*word_separators_trimmed += glyph.total_word_separators();
Length::from(glyph.total_advance())
})
.sum();
// Only keep going if we only encountered whitespace.