Re: MPS: face-cache

[Eli Zaretskii]

> From: Gerd Möllmann <gerd.moellmann@gmail.com>
> Cc: eller.helmut@gmail.com,  emacs-devel@gnu.org
> Date: Sun, 28 Apr 2024 09:55:13 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> From: Gerd Möllmann <gerd.moellmann@gmail.com>
> >> Cc: Eli Zaretskii <eliz@gnu.org>,  emacs-devel missing value
> >>  <emacs-devel@gnu.org>
> >> Date: Sun, 28 Apr 2024 09:22:16 +0200
> >> 
> >> Someone knows something about this in struct frame?
> >> 
> >>   /* List of font-drivers available on the frame.  */
> >>   struct font_driver_list *font_driver_list;
> >
> > It's a list of C structs, AFAICT.
> >
> >> Looks to me that the font objecz could come from there.
> >
> > Can you tell how that could happen, with pointers to the code?
> >
> >> Alas, I don't remember anything about font drivers. I don't think we
> >> had that in the good old times.
> >
> > Yes, they were added in Emacs 23.
> 
> I could find the one(s)? for macOS by searching where
> register_font_driver is called.
> 
> Which shows me macfont_driver and nsfont_driver on my MB. Hope I can
> understand that code :-/.

I think macOS only supports its native drivers (but I'm not sure).
Look for calls to register_font_driver.