organicmaps/harfbuzz
13
Fork 0
mirror of https://github.com/harfbuzz/harfbuzz.git synced 2025-04-13 08:42:59 +00:00
Code Issues 1 Projects Releases Wiki Activity Actions 7

[fontations] Implement get_glyph_h_advances()

Browse source
This commit is contained in:
Behdad Esfahbod 2025-03-04 04:53:41 -07:00 • committed by Khaled Hosny
parent 94a6cfba89
commit 1390da5d12
1 changed files with 37 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

41
src/fontations/lib.rs
View file

@ -13,17 +13,15 @@ use skrifa::instance::{Location, Size};
#[repr(C)]
struct FontationsData {
font_ref: FontRef<'static>,
pub offset: i32,
}
// A destructor for the user_data
extern "C" fn _hb_fontations_data_destroy(ptr: *mut c_void) {
if !ptr.is_null() {
unsafe { let _ = Box::from_raw(ptr as *mut FontationsData); }
}
// TODO
}
// Our callback: get glyph horizontal advance
extern "C" fn _hb_fontations_get_glyph_h_advance(
font: *mut hb_font_t,
font_data: *mut ::std::os::raw::c_void,
@ -45,6 +43,35 @@ extern "C" fn _hb_fontations_get_glyph_h_advance(
let advance = glyph_metrics.advance_width(glyph_id).unwrap_or_default();
advance as hb_position_t
}
extern "C" fn _hb_fontations_get_glyph_h_advances(
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,
glyph_stride: ::std::os::raw::c_uint,
first_advance: *mut hb_position_t,
advance_stride: ::std::os::raw::c_uint,
_user_data: *mut ::std::os::raw::c_void,
) {
let data = unsafe {
assert!(!font_data.is_null());
&*(font_data as *const FontationsData)
};
let mut x_scale : i32 = 0;
let mut y_scale : i32 = 0;
unsafe { hb_font_get_scale(font, &mut x_scale, &mut y_scale); };
let font_ref = &data.font_ref;
let size = Size::new(x_scale as f32);
let location = Location::default();
for i in 0..count {
let glyph = unsafe { *first_glyph.offset((i * glyph_stride) as isize) };
let glyph_id = GlyphId::new(glyph);
let glyph_metrics = font_ref.glyph_metrics(size, &location);
let advance = glyph_metrics.advance_width(glyph_id).unwrap_or_default();
unsafe { *first_advance.offset((i * advance_stride) as isize) = advance as hb_position_t; }
}
}
fn _hb_fontations_font_funcs_create() -> *mut hb_font_funcs_t {
let ffuncs = unsafe { hb_font_funcs_create() };
@ -56,6 +83,12 @@ fn _hb_fontations_font_funcs_create() -> *mut hb_font_funcs_t {
null_mut(),
None
);
hb_font_funcs_set_glyph_h_advances_func(
ffuncs,
Some(_hb_fontations_get_glyph_h_advances),
null_mut(),
None
);
}
ffuncs
@ -76,7 +109,7 @@ pub extern "C" fn hb_fontations_font_set_funcs(
let font_ref = FontRef::from_index(face_data, face_index).unwrap();
// Set up some data for the callbacks to use:
let data = FontationsData { font_ref, offset: 100 };
let data = FontationsData { font_ref };
let data_ptr = Box::into_raw(Box::new(data)) as *mut c_void;
unsafe {