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[coretext-font] Implement get_glyph_v_origin()

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For a font without vertical metrics, I'm getting different
values from ot/ft. But that's expected, since in ot we just
implemented the same heuristics as ft.
This commit is contained in:
Behdad Esfahbod 2024-10-15 14:17:38 -06:00
parent 786097029e
commit de1a1e27d4
1 changed files with 29 additions and 1 deletions
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30
src/hb-coretext-font.cc
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@ -154,6 +154,7 @@ hb_coretext_get_glyph_h_advances (hb_font_t* font, void* font_data,
}
}
#ifndef HB_NO_VERTICAL
static void
hb_coretext_get_glyph_v_advances (hb_font_t* font, void* font_data,
unsigned count,
@ -186,6 +187,33 @@ hb_coretext_get_glyph_v_advances (hb_font_t* font, void* font_data,
}
}
}
#endif
#ifndef HB_NO_VERTICAL
static hb_bool_t
hb_coretext_get_glyph_v_origin (hb_font_t *font,
void *font_data,
hb_codepoint_t glyph,
hb_position_t *x,
hb_position_t *y,
void *user_data HB_UNUSED)
{
CTFontRef ct_font = (CTFontRef) font_data;
CGFloat ct_font_size = CTFontGetSize (ct_font);
CGFloat x_mult = (CGFloat) -font->x_scale / ct_font_size;
CGFloat y_mult = (CGFloat) -font->y_scale / ct_font_size;
const CGGlyph glyphs = glyph;
CGSize origin;
CTFontGetVerticalTranslationsForGlyphs (ct_font, &glyphs, &origin, 1);
*x = round (x_mult * origin.width);
*y = round (y_mult * origin.height);
return true;
}
#endif
static hb_bool_t
hb_coretext_get_glyph_extents (hb_font_t *font,
@ -358,7 +386,7 @@ 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_origin_func (funcs, hb_coretext_get_glyph_v_origin, nullptr, nullptr);
hb_font_funcs_set_glyph_v_origin_func (funcs, hb_coretext_get_glyph_v_origin, nullptr, nullptr);
#endif
#ifndef HB_NO_DRAW