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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Mechanism to scale SVG images when default face height changes?
Date: Mon, 18 Sep 2023 20:53:09 +0300
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Cc: emacs-devel@gnu.org
To: Jimmy Yuen Ho Wong <wyuenho@gmail.com>
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 (message from Jimmy Yuen Ho Wong on Mon, 18 Sep 2023 18:42:33 +0100)
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> From: Jimmy Yuen Ho Wong <wyuenho@gmail.com>
> Date: Mon, 18 Sep 2023 18:42:33 +0100
> 
> As far as I understand, simply adjusting the scale factor of the image will suffice. The problem is,
> since Emacs doesn't do it by itself, I don't really know how to do it in Elisp and be performant. Are
> there any hooks or internal undocumented functions that I can use to scale all the images in all of the
> frames when the default face size changes?

Are you aware of the function image--change-size?