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[coretext-font] Implement get_glyph_v_advances

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This commit is contained in:
Behdad Esfahbod 2024-10-15 14:12:07 -06:00
parent e1026a2252
commit 786097029e
1 changed files with 33 additions and 1 deletions
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34
src/hb-coretext-font.cc
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@ -154,6 +154,38 @@ hb_coretext_get_glyph_h_advances (hb_font_t* font, void* font_data,
}
}
static void
hb_coretext_get_glyph_v_advances (hb_font_t* font, void* font_data,
unsigned count,
const hb_codepoint_t *first_glyph,
unsigned glyph_stride,
hb_position_t *first_advance,
unsigned advance_stride,
void *user_data HB_UNUSED)
{
CTFontRef ct_font = (CTFontRef) font_data;
CGFloat ct_font_size = CTFontGetSize (ct_font);
CGFloat y_mult = (CGFloat) -font->y_scale / ct_font_size;
CGGlyph cg_glyph[MAX_GLYPHS];
CGSize advances[MAX_GLYPHS];
for (unsigned i = 0; i < count; i += MAX_GLYPHS)
{
unsigned c = (unsigned) hb_min ((int) MAX_GLYPHS, (int) count - (int) i);
for (unsigned j = 0; j < c; j++)
{
cg_glyph[j] = *first_glyph;
first_glyph = &StructAtOffset<const hb_codepoint_t> (first_glyph, glyph_stride);
}
CTFontGetAdvancesForGlyphs (ct_font, kCTFontOrientationVertical, cg_glyph, advances, c);
for (unsigned j = 0; j < c; j++)
{
*first_advance = round (advances[j].width * y_mult);
first_advance = &StructAtOffset<hb_position_t> (first_advance, advance_stride);
}
}
}
static hb_bool_t
hb_coretext_get_glyph_extents (hb_font_t *font,
@ -325,7 +357,7 @@ static struct hb_coretext_font_funcs_lazy_loader_t : hb_font_funcs_lazy_loader_t
#ifndef HB_NO_VERTICAL
//hb_font_funcs_set_font_v_extents_func (funcs, hb_coretext_get_font_v_extents, nullptr, nullptr);
//hb_font_funcs_set_glyph_v_advances_func (funcs, hb_coretext_get_glyph_v_advances, nullptr, nullptr);
hb_font_funcs_set_glyph_v_advances_func (funcs, hb_coretext_get_glyph_v_advances, nullptr, nullptr);
//hb_font_funcs_set_glyph_v_origin_func (funcs, hb_coretext_get_glyph_v_origin, nullptr, nullptr);
#endif