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[ot-font] Make advance-cache invalidation threadsafe
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Browse source 
Hopefully.
This commit is contained in:
Behdad Esfahbod 2025-04-02 03:41:32 -06:00
parent bbf0c6e781
commit ef8c25ad9f
1 changed files with 8 additions and 2 deletions
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10
src/hb-ot-font.cc
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@ -202,8 +202,14 @@ hb_ot_get_glyph_h_advances (hb_font_t* font, void* font_data,
{ /* Use cache. */
if (ot_font->cached_coords_serial.get_acquire () != (int) font->serial_coords)
{
ot_font->advance_cache->clear ();
ot_font->cached_coords_serial.set_release (font->serial_coords);
// Retire advance cache and let it be recreated.
auto *old_cache = ot_font->advance_cache.get_acquire ();
if (ot_font->advance_cache.cmpexch (cache, nullptr))
{
ot_font->cached_coords_serial.set_release (font->serial_coords);
hb_free (old_cache);
}
goto retry;
}
for (unsigned int i = 0; i < count; i++)