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Handle multiple BiDi paragraphs in ShapeLine gracefully

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This commit is contained in:
Jeremy Soller 2024-01-04 15:07:15 -07:00
parent 5f4bc87ccf
commit 40e503737b
1 changed files with 11 additions and 8 deletions
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19
src/shape.rs
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@ -678,11 +678,12 @@ impl ShapeLine {
)
}
/// Shape a line into a set of spans, using a scratch buffer.
/// Shape a line into a set of spans, using a scratch buffer. If [`unicode_bidi::BidiInfo`]
/// detects multiple paragraphs, they will be joined.
///
/// # Panics
///
/// Will panic if `line` contains more than one paragraph.
/// Will panic if `line` contains multiple paragraphs that do not have matching direction
pub fn new_in_buffer(
scratch: &mut ShapeBuffer,
font_system: &mut FontSystem,
@ -696,11 +697,14 @@ impl ShapeLine {
let rtl = if bidi.paragraphs.is_empty() {
false
} else {
assert_eq!(bidi.paragraphs.len(), 1);
let para_info = &bidi.paragraphs[0];
let line_rtl = para_info.level.is_rtl();
bidi.paragraphs[0].level.is_rtl()
};
log::trace!("Line {}: '{}'", if line_rtl { "RTL" } else { "LTR" }, line);
log::trace!("Line {}: '{}'", if rtl { "RTL" } else { "LTR" }, line);
for para_info in bidi.paragraphs.iter() {
let line_rtl = para_info.level.is_rtl();
assert_eq!(line_rtl, rtl);
let line_range = para_info.range.clone();
let levels = Self::adjust_levels(&unicode_bidi::Paragraph::new(&bidi, para_info));
@ -743,8 +747,7 @@ impl ShapeLine {
run_level,
shaping,
));
line_rtl
};
}
Self { rtl, spans }
}