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[fontations] Fix get_v_advances() fallback

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Was crashing without vmtx before.
This commit is contained in:
Behdad Esfahbod 2025-03-27 20:02:08 -06:00
parent b808d1746d
commit 449752c57c
1 changed files with 31 additions and 17 deletions
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48
src/fontations/lib.rs
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@ -271,7 +271,7 @@ extern "C" fn _hb_fontations_get_glyph_h_advances(
}
extern "C" fn _hb_fontations_get_glyph_v_advances(
_font: *mut hb_font_t,
font: *mut hb_font_t,
font_data: *mut ::std::os::raw::c_void,
count: ::std::os::raw::c_uint,
first_glyph: *const hb_codepoint_t,
@ -283,24 +283,38 @@ extern "C" fn _hb_fontations_get_glyph_v_advances(
let data = unsafe { &mut *(font_data as *mut FontationsData) };
data.check_for_updates();
let vert_metrics = &data.vert_metrics.as_ref().unwrap();
let vert_vars = &data.vert_vars;
for i in 0..count {
let glyph = struct_at_offset(first_glyph, i, glyph_stride);
let glyph_id = GlyphId::new(glyph);
let mut advance = vert_metrics.advance(glyph_id).unwrap_or_default() as f32;
if let Some(vert_vars) = vert_vars {
let coords = data.location.coords();
if !coords.is_empty() {
advance += vert_vars
.advance_height_delta(glyph_id, coords)
.unwrap_or_default()
.to_f32();
if let Some(vert_metrics) = &data.vert_metrics {
let vert_vars = &data.vert_vars;
for i in 0..count {
let glyph = struct_at_offset(first_glyph, i, glyph_stride);
let glyph_id = GlyphId::new(glyph);
let mut advance = vert_metrics.advance(glyph_id).unwrap_or_default() as f32;
if let Some(vert_vars) = vert_vars {
let coords = data.location.coords();
if !coords.is_empty() {
advance += vert_vars
.advance_height_delta(glyph_id, coords)
.unwrap_or_default()
.to_f32();
}
}
let advance = -(advance * data.y_mult).round() as i32;
*struct_at_offset_mut(first_advance, i, advance_stride) = advance as hb_position_t;
}
} else {
let mut font_extents = 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);
for i in 0..count {
*struct_at_offset_mut(first_advance, i, advance_stride) = advance;
}
let advance = -(advance * data.y_mult).round() as i32;
*struct_at_offset_mut(first_advance, i, advance_stride) = advance as hb_position_t;
}
}