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[fontations] Implement get_glyph_extents

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This commit is contained in:
Behdad Esfahbod 2025-03-04 17:30:57 -07:00 • committed by Khaled Hosny
parent f2e5955e1e
commit b9a4d148c9
1 changed files with 44 additions and 0 deletions
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44
src/fontations/lib.rs
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@ -113,6 +113,44 @@ extern "C" fn _hb_fontations_get_glyph_h_advances(
}
}
}
extern "C" fn _hb_fontations_get_glyph_extents(
_font: *mut hb_font_t,
font_data: *mut ::std::os::raw::c_void,
glyph: hb_codepoint_t,
extents: *mut hb_glyph_extents_t,
_user_data: *mut ::std::os::raw::c_void,
) -> hb_bool_t {
let data = unsafe { &*(font_data as *const FontationsData) };
let font_ref = &data.font_ref;
let x_size = &data.x_size;
let y_size = &data.y_size;
let location = &data.location;
let x_glyph_metrics = font_ref.glyph_metrics(*x_size, location);
let y_glyph_metrics = font_ref.glyph_metrics(*y_size, location);
let glyph_id = GlyphId::new(glyph as u32);
let x_extents = x_glyph_metrics.bounds(glyph_id);
let y_extents = y_glyph_metrics.bounds(glyph_id);
if x_extents.is_none() || y_extents.is_none() {
return false as hb_bool_t;
}
let x_extents = x_extents.unwrap();
let y_extents = y_extents.unwrap();
unsafe {
(*extents).x_bearing = x_extents.x_min as hb_position_t;
}
unsafe {
(*extents).width = (x_extents.x_max - x_extents.x_min) as hb_position_t;
}
unsafe {
(*extents).y_bearing = y_extents.y_max as hb_position_t;
}
unsafe {
(*extents).height = (y_extents.y_min - y_extents.y_max) as hb_position_t;
}
true as hb_bool_t
}
fn _hb_fontations_font_funcs_create() -> *mut hb_font_funcs_t {
static static_ffuncs: AtomicPtr<hb_font_funcs_t> = AtomicPtr::new(null_mut());
@ -145,6 +183,12 @@ fn _hb_fontations_font_funcs_create() -> *mut hb_font_funcs_t {
null_mut(),
None,
);
hb_font_funcs_set_glyph_extents_func(
ffuncs,
Some(_hb_fontations_get_glyph_extents),
null_mut(),
None,
);
}
if (static_ffuncs.compare_exchange(null_mut(), ffuncs, Ordering::SeqCst, Ordering::Relaxed))