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From: marius a. eriksen <marius@monkey.org>
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Date: Thu,  5 Sep 2013 20:32:42 -0700
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	<CAKzdPgxqv-kbJd9Ft_aoJXbOuK=x1K8YZUTX1TZfD9vSOfqoww@mail.gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Subject: Re: [9fans] p9p on Retina Macs
Topicbox-Message-UUID: 79facd3c-ead8-11e9-9d60-3106f5b1d025

Thanks for the pointers.

I finally did some sleuthing and experimentation.

Indeed, devdraw now knows about a display=E2=80=99s DPI, and launching a =
devdraw app with environment devdrawretina=3D1 enables detection of =
retina displays, and setting the current DPI accordingly.

DPI seems to affect a few things:

1. computing geometries of fixed-sized UI elements like scroll bars
2. computing scroll =E2=80=9Cticks=E2=80=9D

=E2=8C=98-R toggles the current DPI from =E2=80=9Cretina=E2=80=9D (220 =
DPI) to =E2=80=9Cnon-retina=E2=80=9D (110 DPI).

There doesn=E2=80=99t seem to be any sort of built-in font scaling at =
the moment. So when you launch, say, acme on a retina machine, you=E2=80=99=
ll have to supply your own (larger) font. I ended up using fontsrv with =
system fonts:

	% devdrawretina=3D1 acme -f =
/mnt/font/HelveticaNeue-Medium/24a/font -F =
/mnt/font/Menlo-Regular/22a/font=20

seems to work pretty well.

-m.