bug#68006: 30.0.50; Image-mode speed

[Eli Zaretskii]

> From: Manuel Giraud <manuel@ledu-giraud.fr>
> Cc: stefankangas@gmail.com,  68006@debbugs.gnu.org
> Date: Fri, 05 Jan 2024 14:26:20 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> > But we might need to store additional information there, like the
> >> > buffer of the image, for example.
> >> 
> >> I don't understand.  Where do you think that the buffer of the image
> >> should be stored?
> >
> > In the cache, together with the image, I think.
> 
> You mean in struct image_cache?

Yes.

> > How else would the Lisp programs know which images "belong" to them,
> > and when to uncache them?
> 
> I don't know exactly.  My idea was that an image-mode buffer has (buffer
> local I guess) variable that will hold its image cache.

That is also possible, but then will the cache itself be implemented
only in Lisp?  I assumed at least some of it will be in C.