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Fix repetition of Thai characters (#4977)

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Co-authored-by: Martin Haug <mhaug@live.de>
This commit is contained in:
Laurenz 2024-09-17 17:35:56 +02:00 committed by GitHub
parent 0abd46c379
commit ab8295c07d
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GPG Key ID: B5690EEEBB952194
4 changed files with 18 additions and 11 deletions
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21
crates/typst/src/layout/inline/shaping.rs
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@ -515,14 +515,14 @@ impl<'a> ShapedText<'a> {
std::mem::swap(&mut start, &mut end);
}
let left = self.find_safe_to_break(start, Side::Left)?;
let right = self.find_safe_to_break(end, Side::Right)?;
let left = self.find_safe_to_break(start)?;
let right = self.find_safe_to_break(end)?;
Some(&self.glyphs[left..right])
}
/// Find the glyph offset matching the text index that is most towards the
/// given side and safe-to-break.
fn find_safe_to_break(&self, text_index: usize, towards: Side) -> Option<usize> {
/// start of the text and safe-to-break.
fn find_safe_to_break(&self, text_index: usize) -> Option<usize> {
let ltr = self.dir.is_positive();
// Handle edge cases.
@ -542,6 +542,7 @@ impl<'a> ShapedText<'a> {
ordering.reverse()
}
});
let mut idx = match found {
Ok(idx) => idx,
Err(idx) => {
@ -565,13 +566,11 @@ impl<'a> ShapedText<'a> {
}
};
let next = match towards {
Side::Left => usize::checked_sub,
Side::Right => usize::checked_add,
};
// Search for the outermost glyph with the text index.
while let Some(next) = next(idx, 1) {
// Search for the start-most glyph with the text index. This means
// we take empty range glyphs at the start and leave those at the end
// for the next line.
let dec = if ltr { usize::checked_sub } else { usize::checked_add };
while let Some(next) = dec(idx, 1) {
if self.glyphs.get(next).map_or(true, |g| g.range.start != text_index) {
break;
}

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tests/ref/issue-4468-linebreak-thai.png Normal file
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tests/ref/linebreak-thai.png
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8
tests/suite/layout/inline/linebreak.typ
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@ -115,3 +115,11 @@ For info see #link("https://myhost.tld").
// for links because it now splits on word boundaries. We avoid the link markup
// syntax because it's show rule interferes.
#"http://creativecommons.org/licenses/by-nc-sa/4.0/"
--- issue-4468-linebreak-thai ---
// In this bug, empty-range glyphs at line break boundaries could be duplicated.
// This happens for Thai specifically because it has both
// - line break opportunities
// - shaping that results in multiple glyphs in the same cluster
#set text(font: "Noto Sans Thai")
#h(85pt) งบิก