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Subject: bug#50958: 27.2; Very blurry svg rendering on Retina screen
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Hi all,

I'm having a hard time getting org-mode LaTeX preview to render without
excesive blurriness. I started with a default configuration of emacs
27.2 from https://emacsformacosx.com/. Since that build doesn't support
svg rendering, I moved to emacs 27.2 from
https://github.com/d12frosted/homebrew-emacs-plus, which is compiled
with svg support. But the rendering ended up being as blurry as with
png. So I opened the particular svg files that the org-mode backend was
producing in the stock Preview app and they look just fine. I also
opened them with doc-view and they look as bad as in org-mode. So is
this a known issue? Some part seems to have the wrong idea of the actual
resolution of my device.

Best regards,
Carlos

---

In GNU Emacs 27.2 (build 1, x86_64-apple-darwin20.6.0, NS appkit-2022.60 =
Version 11.6 (Build 20G165))
 of 2021-10-02 built on Carloss-MacBook-Pro.local
Windowing system distributor 'Apple', version 10.3.2022
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Recent messages:
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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Carlos Pita <carlosjosepita@HIDDEN>
Subject: bug#50958: Acknowledgement (27.2; Very blurry svg rendering on
 Retina screen)
Message-ID: <handler.50958.B.16331595352838.ack <at> debbugs.gnu.org>
References: <3A8EA058-D2F0-4FF8-9C36-ACF7598EB657@HIDDEN>
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Subject: bug#50958: 27.2; Very blurry svg rendering on Retina screen
Resent-From: Lars Ingebrigtsen <larsi@HIDDEN>
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Cc: 50958 <at> debbugs.gnu.org
From: Lars Ingebrigtsen <larsi@HIDDEN>
References: <3A8EA058-D2F0-4FF8-9C36-ACF7598EB657@HIDDEN>
Date: Sat, 02 Oct 2021 11:06:27 +0200
In-Reply-To: <3A8EA058-D2F0-4FF8-9C36-ACF7598EB657@HIDDEN> (Carlos Pita's
 message of "Sat, 2 Oct 2021 04:25:20 -0300")
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Carlos Pita <carlosjosepita@HIDDEN> writes:

> I'm having a hard time getting org-mode LaTeX preview to render without
> excesive blurriness. 

SVG rendering on HiDPI screens has been improved in Emacs 28 -- could
you try that instead to see whether it fixes the problem?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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Subject: bug#50958: 27.2; Very blurry svg rendering on Retina screen
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From: Carlos Pita <carlosjosepita@HIDDEN>
In-Reply-To: <87bl47vlrg.fsf@HIDDEN>
Date: Sat, 2 Oct 2021 12:52:18 -0300
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> SVG rendering on HiDPI screens has been improved in Emacs 28 -- could
> you try that instead to see whether it fixes the problem?

Sure Lars, I was going to do it anyway because of other issues with =
pdf-tools.

It indeed fixes part of the problem:

* LaTeX previews in org-mode are high resolution now.
* Also adds the frame-scale-factor function that=E2=80=99s used by the =
fix to pdf-tools [1] blurry rendering.

But other related issues remain:

* doc-view still renders low-resolution svg.
* doc-view still renders low-resolution pdf (which is not the topic of =
this issue but may be relevant).

Best regards,
Carlos

---

[1] =
https://github.com/vedang/pdf-tools/commit/f771c93781b3135200cae6dbc8e45db=
b887f77b1

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 Content preview:  Carlos Pita <carlosjosepita@HIDDEN> writes: > But other
 related issues remain: > > * doc-view still renders low-resolution svg. >
 * doc-view still renders low-resolution pdf (which is not the topic of >
 this issue but may be relevant). 
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Carlos Pita <carlosjosepita@HIDDEN> writes:

> But other related issues remain:
>
> * doc-view still renders low-resolution svg.
> * doc-view still renders low-resolution pdf (which is not the topic of
> this issue but may be relevant).

Perhaps Alan has some comments here -- he did the work to get HiDPI
rendering to work for SVGs, so I've added him to the CCs.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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From: Alan Third <alan@HIDDEN>
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On Sun, Oct 03, 2021 at 10:56:44AM +0200, Lars Ingebrigtsen wrote:
> Carlos Pita <carlosjosepita@HIDDEN> writes:
> 
> > But other related issues remain:
> >
> > * doc-view still renders low-resolution svg.
> > * doc-view still renders low-resolution pdf (which is not the topic of
> > this issue but may be relevant).
> 
> Perhaps Alan has some comments here -- he did the work to get HiDPI
> rendering to work for SVGs, so I've added him to the CCs.

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.
-- 
Alan Third

Last modified: Sun, 3 Oct 2021 10:00:02 UTC

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