GNU bug report logs - #50958
27.2; Very blurry svg rendering on Retina screen

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Message #20 received at 50958 <at> debbugs.gnu.org (full text, mbox):

From: Carlos Pita <carlosjosepita <at> gmail.com>
To: Alan Third <alan <at> idiocy.org>, Lars Ingebrigtsen <larsi <at> gnus.org>, 
 Carlos Pita <carlosjosepita <at> gmail.com>, 50958 <at> debbugs.gnu.org
Subject: Re: bug#50958: 27.2; Very blurry svg rendering on Retina screen
Date: Tue, 5 Oct 2021 02:42:08 -0300

Hi Alan,

> I think docview uses external applications to render the files to png
> and it has its own setting for DPI (doc-view-resolution), which on a
> hi-dpi screen is a bit low.
>
> IIRC docview is a bit strange because you don't set the dpi to the
> screen's dpi, the actual value you want to use depends on various
> factors, like how large your window is and whether you zoom in on the
> image or not.

Wouldn't it make sense to set the default resolution to a value more
appropriate to the screen resolution then? I understand that someone
may want to change it for zooming for example, but OOTB seems quite
broken in a HiDPI screen and the average user (even the average emacs
user) probably doesn't understand a lot about scaling factors, not to
say about the existence of doc-view-resolution. Maybe now that there
is frame-scale-factor in emacs 28 it could be used to set the default
resolution for docview?

Best regards,
Carlos

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