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[fontations] Boilerplate for draw_glyph

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This commit is contained in:
Behdad Esfahbod 2025-03-04 18:08:56 -07:00 • committed by Khaled Hosny
parent bc2851b407
commit 87c62f4ebb
1 changed files with 39 additions and 3 deletions
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42
src/fontations/lib.rs
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@ -6,17 +6,20 @@ use std::os::raw::c_void;
use std::ptr::null_mut;
use std::sync::atomic::{AtomicPtr, Ordering};
use skrifa::charmap::Charmap;
use skrifa::charmap::MapVariant::Variant;
use skrifa::font::FontRef;
use skrifa::instance::{Location, NormalizedCoord, Size};
use skrifa::{charmap, GlyphId, MetadataProvider};
use skrifa::outline::pen::NullPen;
use skrifa::outline::DrawSettings;
use skrifa::{GlyphId, MetadataProvider};
// A struct for storing your “fontations” data
#[repr(C)]
struct FontationsData {
face_blob: *mut hb_blob_t,
font_ref: FontRef<'static>,
char_map: charmap::Charmap<'static>,
char_map: Charmap<'static>,
x_size: Size,
y_size: Size,
location: Location,
@ -177,6 +180,33 @@ extern "C" fn _hb_fontations_get_font_h_extents(
true as hb_bool_t
}
extern "C" fn _hb_fontations_draw_glyph(
_font: *mut hb_font_t,
font_data: *mut ::std::os::raw::c_void,
glyph: hb_codepoint_t,
draw_funcs: *mut hb_draw_funcs_t,
draw_data: *mut ::std::os::raw::c_void,
_user_data: *mut ::std::os::raw::c_void,
) {
let data = unsafe { &*(font_data as *const FontationsData) };
let font_ref = &data.font_ref;
let x_size = &data.x_size;
let location = &data.location;
// Create an outline-glyph
let glyph_id = GlyphId::new(glyph as u32);
let outline_glyphs = font_ref.outline_glyphs();
let outline_glyph = outline_glyphs.get(glyph_id);
if outline_glyph.is_none() {
return;
}
let outline_glyph = outline_glyph.unwrap();
let draw_settings = DrawSettings::unhinted(*x_size, location);
let mut pen = NullPen;
let _ = outline_glyph.draw(draw_settings, &mut pen);
}
fn _hb_fontations_font_funcs_create() -> *mut hb_font_funcs_t {
static static_ffuncs: AtomicPtr<hb_font_funcs_t> = AtomicPtr::new(null_mut());
@ -220,6 +250,12 @@ fn _hb_fontations_font_funcs_create() -> *mut hb_font_funcs_t {
null_mut(),
None,
);
hb_font_funcs_set_draw_glyph_func(
ffuncs,
Some(_hb_fontations_draw_glyph),
null_mut(),
None,
);
}
if (static_ffuncs.compare_exchange(null_mut(), ffuncs, Ordering::SeqCst, Ordering::Relaxed))
@ -248,7 +284,7 @@ pub extern "C" fn hb_fontations_font_set_funcs(font: *mut hb_font_t) {
let font_ref = FontRef::from_index(face_data, face_index).unwrap();
let char_map = charmap::Charmap::new(&font_ref);
let char_map = Charmap::new(&font_ref);
let mut num_coords: u32 = 0;
let coords = unsafe { hb_font_get_var_coords_normalized(font, &mut num_coords) };