> On Apr 23, 2020, at 3:40 PM, Eli Zaretskii <eliz@gnu.org> wrote:
>
>> From: Yuan Fu <casouri@gmail.com>
>> Date: Thu, 23 Apr 2020 15:35:19 -0400
>> Cc: Werner LEMBERG <wl@gnu.org>,
>> Juri Linkov <juri@linkov.net>,
>> Yuri Khan <yuri.v.khan@gmail.com>,
>> Clément Pit-Claudel <cpitclaudel@gmail.com>,
>> yandros@gmail.com,
>> emacs-devel@gnu.org
>>
>> Apart from the font vs image discussion, what about the idea to add @2x images support to Emacs?
>> WDYT? Basically, we add name@2x.xpm images along side the existing name.xpm images. And find-image
>> would prefer those @2x images if, say, image-prefer-hidpi is non-nil.
>
> I don't think I understand what is meant by @2x images, but the
> general idea of preferring certain variants of images given some
> aspect of the environment is sound.

On HiDPI monitors you can essentially display 200x200 pixels on the same area where normal monitors can display 100x100 pixels, hence the @2x. Application icons nowadays normally comes with @2x and @3x variants. So a 32x32 icon also comes with 64x64 and 96x96 size. At least that’s how is goes for iOS and macOS apps.

Yuan