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[font-funcs] Support HB_FONT_FUNCS env var

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This commit is contained in:
Behdad Esfahbod 2025-03-08 12:41:50 -07:00
parent 5a12bf417b
commit 68b07475a7
1 changed files with 15 additions and 4 deletions
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19
src/hb-font.cc
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@ -1867,10 +1867,19 @@ hb_font_create (hb_face_t *face)
{
hb_font_t *font = _hb_font_create (face);
#ifndef HB_NO_OT_FONT
/* Install our in-house, very lightweight, funcs. */
hb_ot_font_set_funcs (font);
#endif
static hb_atomic_ptr_t<const char> static_funcs_name;
const char *funcs_name = static_funcs_name.get_acquire ();
if (!funcs_name)
{
funcs_name = getenv ("HB_FONT_FUNCS");
if (!funcs_name)
funcs_name = "";
if (!static_funcs_name.cmpexch (nullptr, funcs_name))
funcs_name = static_funcs_name.get_acquire ();
}
if (unlikely (!hb_font_set_funcs_using (font, funcs_name)))
hb_font_set_funcs_using (font, nullptr);
#ifndef HB_NO_VAR
if (face && face->index >> 16)
@ -2310,7 +2319,9 @@ static struct supported_font_funcs_t {
void (*func) (hb_font_t *);
} supported_font_funcs[] =
{
#ifndef HB_NO_OT_FONT
{"ot", hb_ot_font_set_funcs},
#endif
#ifdef HAVE_FREETYPE
{"ft", hb_ft_font_set_funcs},
#endif