Re: master 5141234acf: Refactor the webp cache code to allow usage by gif_load, too

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: emacs-devel@gnu.org,  larsi@gnus.org
> Date: Mon, 11 Apr 2022 21:25:07 +0800
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> From: Po Lu <luangruo@yahoo.com>
> >> Cc: Lars Ingebrigtsen <larsi@gnus.org>
> >> Date: Mon, 11 Apr 2022 20:15:12 +0800
> >> 
> >> > +  cache->spec = spec;
> >> 
> >> I think this should be marked, since I don't see what protects the spec
> >> from garbage collection otherwise.
> >
> > 'spec' here is img->spec, right?
> 
> Right, but the animation cache can persist after img is gone, right?

It can?  Then how does this work:

      struct anim_cache* cache = anim_get_animation_cache (img->spec);

We pass img->spec to look it up in the cache, don't we?  And we use EQ
to look it up, right?