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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: prettify-symbols-mode, derived modes, and compose-region
Date: Sat, 06 Mar 2021 12:59:02 +0200
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Cc: larsi@gnus.org, monnier@iro.umontreal.ca, emacs-devel@gnu.org
To: D <d.williams@posteo.net>
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> Cc: monnier@iro.umontreal.ca, larsi@gnus.org, emacs-devel@gnu.org
> From: D <d.williams@posteo.net>
> Date: Sat, 6 Mar 2021 11:43:45 +0100
> 
> > In your original use case you didn't have images, you had characters.
> > Or did I misunderstand?
> 
> That's correct, my point was whether there was any common underlying
> logic one could make use of.

Calculating the size of images is different from that of character
glyphs.  So the general logic may be similar, but the implementation
is very different.