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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: High-res Customize icons
Date: Fri, 23 Oct 2020 21:08:43 +0300
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Cc: yandros@gmail.com, cpitclaudel@gmail.com, emacs-devel@gnu.org
To: Yuan Fu <casouri@gmail.com>
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In-Reply-To: <17B57ACD-3249-463A-9F23-7EA9B3E0C9A1@gmail.com> (message from
 Yuan Fu on Fri, 23 Oct 2020 12:39:44 -0400)
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> From: Yuan Fu <casouri@gmail.com>
> Date: Fri, 23 Oct 2020 12:39:44 -0400
> Cc: chad <yandros@gmail.com>,
>  cpitclaudel@gmail.com,
>  emacs-devel@gnu.org
> 
> (defcustom image-resolution-scaling-factor 1
>   "If greater than 1, try display high-res alternatives.
> E.g., if the value is 2, `find-image' tries to find file@2x.png
> for file.png."
>   :type '(choice number
>                  (const :tag "1x" 1)
>                  (const :tag "2x" 2)
>                  (const :tag "3x" 3))
>   :version "28.1")

The reason I said defcustom didn't sound like TRT was because I think
Emacs should handle this automatically.  It should automatically load
the high resolution images when appropriate.  Where it finds those
images and by what logic is a secondary question.