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[fontations] Add a constructor

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This commit is contained in:
Behdad Esfahbod 2025-03-06 16:11:01 -07:00
parent 44705c1acb
commit cd45a7f531
1 changed files with 61 additions and 55 deletions
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116
src/fontations/lib.rs
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@ -34,6 +34,65 @@ struct FontationsData<'a> {
color_glyphs: ColorGlyphCollection<'a>,
}
impl FontationsData<'_> {
unsafe fn from_hb_font(font: *mut hb_font_t) -> Self {
let face_index = hb_face_get_index(hb_font_get_face(font));
let face_blob = hb_face_reference_blob(hb_font_get_face(font));
let blob_length = hb_blob_get_length(face_blob);
let blob_data = hb_blob_get_data(face_blob, null_mut());
let face_data = std::slice::from_raw_parts(blob_data as *const u8, blob_length as usize);
let font_ref = FontRef::from_index(face_data, face_index).unwrap();
let char_map = Charmap::new(&font_ref);
let mut x_scale: i32 = 0;
let mut y_scale: i32 = 0;
hb_font_get_scale(font, &mut x_scale, &mut y_scale);
let x_size = Size::new(x_scale as f32);
let y_size = Size::new(y_scale as f32);
let mut num_coords: u32 = 0;
let coords = hb_font_get_var_coords_normalized(font, &mut num_coords);
let coords = if coords.is_null() {
&[]
} else {
std::slice::from_raw_parts(coords, num_coords as usize)
};
let all_zeros = coords.iter().all(|&x| x == 0);
// if all zeros, use Location::default()
// otherwise, use the provided coords.
// This currently doesn't seem to have a perf effect on fontations, but it's a good idea to
// check if the coords are all zeros before creating a Location.
let location = if all_zeros {
Location::default()
} else {
let mut location = Location::new(num_coords as usize);
let coords_mut = location.coords_mut();
coords_mut
.iter_mut()
.zip(coords.iter().map(|v| NormalizedCoord::from_bits(*v as i16)))
.for_each(|(dest, source)| *dest = source);
location
};
let outline_glyphs = font_ref.outline_glyphs();
let color_glyphs = font_ref.color_glyphs();
FontationsData {
face_blob,
font_ref,
char_map,
x_size,
y_size,
location,
outline_glyphs,
color_glyphs,
}
}
}
extern "C" fn _hb_fontations_data_destroy(font_data: *mut c_void) {
let data = unsafe { Box::from_raw(font_data as *mut FontationsData) };
@ -731,61 +790,8 @@ fn _hb_fontations_font_funcs_get() -> *mut hb_font_funcs_t {
pub unsafe extern "C" fn hb_fontations_font_set_funcs(font: *mut hb_font_t) {
let ffuncs = _hb_fontations_font_funcs_get();
let face_index = hb_face_get_index(hb_font_get_face(font));
let face_blob = hb_face_reference_blob(hb_font_get_face(font));
let blob_length = hb_blob_get_length(face_blob);
let blob_data = hb_blob_get_data(face_blob, null_mut());
let face_data = std::slice::from_raw_parts(blob_data as *const u8, blob_length as usize);
let font_ref = FontRef::from_index(face_data, face_index).unwrap();
let char_map = Charmap::new(&font_ref);
let mut x_scale: i32 = 0;
let mut y_scale: i32 = 0;
hb_font_get_scale(font, &mut x_scale, &mut y_scale);
let x_size = Size::new(x_scale as f32);
let y_size = Size::new(y_scale as f32);
let mut num_coords: u32 = 0;
let coords = hb_font_get_var_coords_normalized(font, &mut num_coords);
let coords = if coords.is_null() {
&[]
} else {
std::slice::from_raw_parts(coords, num_coords as usize)
};
let all_zeros = coords.iter().all(|&x| x == 0);
// if all zeros, use Location::default()
// otherwise, use the provided coords.
// This currently doesn't seem to have a perf effect on fontations, but it's a good idea to
// check if the coords are all zeros before creating a Location.
let location = if all_zeros {
Location::default()
} else {
let mut location = Location::new(num_coords as usize);
let coords_mut = location.coords_mut();
coords_mut
.iter_mut()
.zip(coords.iter().map(|v| NormalizedCoord::from_bits(*v as i16)))
.for_each(|(dest, source)| *dest = source);
location
};
let outline_glyphs = font_ref.outline_glyphs();
let color_glyphs = font_ref.color_glyphs();
let data = Box::new(FontationsData {
face_blob,
font_ref,
char_map,
x_size,
y_size,
location,
outline_glyphs,
color_glyphs,
});
let data_ptr = Box::into_raw(data) as *mut c_void;
let data = FontationsData::from_hb_font(font);
let data_ptr = Box::into_raw(Box::new(data)) as *mut c_void;
hb_font_set_funcs(font, ffuncs, data_ptr, Some(_hb_fontations_data_destroy));
}