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Make the width of the thin space configurable (#8070)

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Adds `FontTweak::thin_space_width` and `FontTweak::tab_size`
This commit is contained in:
Emil Ernerfeldt
2026-04-06 18:09:54 +02:00
committed by GitHub
parent 16cad760a5
commit ab4bca65ea
11 changed files with 73 additions and 37 deletions
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17
crates/epaint/src/text/text_layout.rs
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@@ -8,7 +8,6 @@ use crate::{
Color32, Mesh, Stroke, Vertex,
stroke::PathStroke,
text::{
TAB_SIZE,
font::{StyledMetrics, UvRect, is_cjk, is_cjk_break_allowed},
fonts::FontFaceKey,
},
@@ -250,11 +249,23 @@ fn layout_shaped_run(
.unwrap_or('\u{FFFD}'); // Unicode Replacement Character
// Tab is a layout concept, not a glyph — the shaper doesn't know about tab stops.
// Override the advance width to TAB_SIZE × space width.
// Override the advance width using the font's configured tab size.
if chr == '\t' {
let tweak = font.fonts_by_id.get(&run.font_key).map(|ff| ff.tweak());
let tab_size = tweak.map_or(4.0, |t| t.tab_size);
let (_, space_info) = font.glyph_info(' ');
let space_width_px = space_info.advance_width_unscaled.0 * px_scale;
advance_width_px = TAB_SIZE as f32 * space_width_px;
advance_width_px = tab_size * space_width_px;
}
// Thin space (U+2009) and narrow no-break space (U+202F):
// override the shaper's advance width with the configured fraction of a space.
if chr == '\u{2009}' || chr == '\u{202F}' {
let tweak = font.fonts_by_id.get(&run.font_key).map(|ff| ff.tweak());
let thin_space_width = tweak.map_or(0.5, |t| t.thin_space_width);
let (_, space_info) = font.glyph_info(' ');
let space_width_px = space_info.advance_width_unscaled.0 * px_scale;
advance_width_px = thin_space_width * space_width_px;
}
// Apply extra_letter_spacing only at cluster boundaries,