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Improved line wrapping of bidi text

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This commit is contained in:
Jeremy Soller 2022-10-10 08:30:32 -06:00
parent 66ab1e6000
commit a52bb1956e
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GPG key ID: 87F211AF2BE4C2FE
1 changed files with 20 additions and 29 deletions
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49
examples/text/src/font/shape.rs
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@ -148,7 +148,7 @@ impl<'a> FontShapeLine<'a> {
};
if wrap {
word_ranges.push((i + 1..fitting_end));
word_ranges.push((i + 1..fitting_end, true));
if word.blank {
fitting_end = i;
} else {
@ -164,7 +164,9 @@ impl<'a> FontShapeLine<'a> {
fit_x += word_size;
}
}
word_ranges.push((0..fitting_end));
word_ranges.push((0..fitting_end, false));
println!("{:?}", word_ranges);
} else {
let mut fit_x = x;
let mut fitting_start = 0;
@ -183,7 +185,7 @@ impl<'a> FontShapeLine<'a> {
};
if wrap {
word_ranges.push((fitting_start..i));
word_ranges.push((fitting_start..i, true));
if word.blank {
fitting_start = i + 1;
} else {
@ -199,35 +201,11 @@ impl<'a> FontShapeLine<'a> {
fit_x += word_size;
}
}
word_ranges.push((fitting_start..span.words.len()));
word_ranges.push((fitting_start..span.words.len(), false));
}
for range in word_ranges {
for (range, wrap) in word_ranges {
for word in span.words[range].iter() {
let mut word_size = 0.0;
for glyph in word.glyphs.iter() {
word_size += font_size as f32 * glyph.x_advance;
}
//TODO: make wrapping optional
let wrap = if self.rtl {
x - word_size < end_x
} else {
x + word_size > end_x
};
if wrap && ! glyphs.is_empty() {
let mut glyphs_swap = Vec::new();
std::mem::swap(&mut glyphs, &mut glyphs_swap);
layout_lines.insert(layout_i, FontLayoutLine {
line_i: self.line_i,
glyphs: glyphs_swap
});
layout_i += 1;
x = start_x;
y = 0.0;
}
for glyph in word.glyphs.iter() {
let x_advance = font_size as f32 * glyph.x_advance;
let y_advance = font_size as f32 * glyph.y_advance;
@ -245,6 +223,19 @@ impl<'a> FontShapeLine<'a> {
y += y_advance;
}
}
if wrap {
let mut glyphs_swap = Vec::new();
std::mem::swap(&mut glyphs, &mut glyphs_swap);
layout_lines.insert(layout_i, FontLayoutLine {
line_i: self.line_i,
glyphs: glyphs_swap
});
layout_i += 1;
x = start_x;
y = 0.0;
}
}
}