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[fontations] Implement last bits of v_origin

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This commit is contained in:
Behdad Esfahbod 2025-03-28 13:15:37 -06:00
parent 1dac21c177
commit 1358e38154
2 changed files with 36 additions and 2 deletions
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36
src/fontations/lib.rs
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@ -356,7 +356,41 @@ extern "C" fn _hb_fontations_get_glyph_v_origin(
return true as hb_bool_t;
}
// TODO: Implement the fallback case for TrueType with vmtx.
let mut extents: hb_glyph_extents_t = unsafe { std::mem::zeroed() };
if unsafe { hb_font_get_glyph_extents(font, glyph, &mut extents) != 0 } {
if let Some(vert_metrics) = &data.vert_metrics {
let glyph = GlyphId::new(glyph);
let mut tsb: f32 = vert_metrics.side_bearing(glyph).unwrap_or_default() as f32;
if let Some(vert_vars) = &data.vert_vars {
let coords = data.location.coords();
if !coords.is_empty() {
tsb += vert_vars
.tsb_delta(glyph, coords)
.unwrap_or_default()
.to_f32();
}
}
unsafe {
*y = extents.y_bearing + (tsb * data.y_mult).round() as hb_position_t;
}
return true as hb_bool_t;
}
let mut font_extents: hb_font_extents_t = unsafe { std::mem::zeroed() };
unsafe {
hb_font_get_extents_for_direction(
font,
hb_direction_t_HB_DIRECTION_LTR,
&mut font_extents,
);
}
let advance: hb_position_t = font_extents.ascender - font_extents.descender;
let diff: hb_position_t = advance - -extents.height;
unsafe {
*y = extents.y_bearing + (diff >> 1);
}
return true as hb_bool_t;
}
let mut font_extents: hb_font_extents_t = unsafe { std::mem::zeroed() };
unsafe {

2
src/hb-ot-font.cc
View file

@ -376,7 +376,7 @@ hb_ot_get_glyph_v_origin (hb_font_t *font,
hb_font_extents_t font_extents;
font->get_h_extents_with_fallback (&font_extents);
hb_position_t advance = font_extents.ascender - font_extents.descender;
int diff = advance - -extents.height;
hb_position_t diff = advance - -extents.height;
*y = extents.y_bearing + (diff >> 1);
return true;
}