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From: Evgeny Zajcev <lg.zevlg@gmail.com>
To: emacs-devel <emacs-devel@gnu.org>
Subject: exposing x_get_scale_factor into elisp level
Date: Mon, 22 Mar 2021 02:07:41 +0300	[thread overview]
Message-ID: <CAO=W_Zrs5GM2DzZbQEzWmDXc1zVBPM76-ckd1t-D1nXNEHXNPQ@mail.gmail.com> (raw)

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HiDPI is very common nowadays.  Internally Emacs has decent support for
HiDPI displays.  However elisp code, that generates non-svg images don't
have any idea that logical pixel may differ from physical one, resulting in
generating images in low resolution on HiDPI displays.

Emacs internally has a notion about HiDPI displays, such as
`x_get_scale_factor`, maybe expose this function to elisp level, so
packages may utilize it to generate images in highres?

Or `(> (round (/ (display-pixel-height) (/ (display-mm-height) 25.4))) 96)`
is good enough to detect HiDPI displays?

Thanks

-- 
lg

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             reply	other threads:[~2021-03-21 23:07 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-21 23:07 Evgeny Zajcev [this message]
2021-03-24 20:27 ` exposing x_get_scale_factor into elisp level Alan Third
2021-03-24 21:20   ` Evgeny Zajcev
2021-03-24 22:55     ` Alan Third
2021-03-25  1:32     ` Yuan Fu
2021-04-04 10:38     ` Alan Third

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