GNU bug report logs - #58041
[PATCH] docview: Use svg images when using mupdf for conversion

Previous Next

Full log

Message #17 received at 58041 <at> debbugs.gnu.org (full text, mbox):

From: Visuwesh <visuweshm <at> gmail.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 58041 <at> debbugs.gnu.org
Subject: Re: bug#58041: [PATCH] docview: Use svg images when using mupdf for
 conversion
Date: Sun, 08 Jan 2023 11:39:16 +0530

[புதன் ஜனவரி 04, 2023] Stefan Monnier wrote:

>> Attached patch makes mupdf produce svg images rather than png when svg
>> support is available.  This makes a noticeable improvement in image
>> quality when zooming in.
>
> IIUC this means that `+` and `-` now don't need to re-process the PDF, right?
> I think this is particularly valuable for things like ODT where `+/-`
> was pretty slow (because it re-created the PDF each time before having
> a chance to focus on the current page).

It depends on the value of `doc-view-scale-internally'.  The default
value (t) implies that we change the :width image property which leads
to blurry images when zooming.  In my case, even without zooming in, the
image quality was noticeably worse.
If `doc-view-scale-internally' is nil though, what you say happens.

> If that's the case it's probably worth mentioning in NEWS.
>
>> This also improves epub, odt, docx, etc. rendering since they also end
>> up using mupdf.  I'm not sure if this is NEWS worthy though.
>
> Other reasons it's worth mentioning in NEWS is because there's a new
> Custom to control it, and because it causes a regression for those LaTeX
> files which end up embedding bitmap fonts.  I just bumped into one and
> couldn't understand why every page took almost a minute to load;
> Removing `\usepackage[T1]{fontenc}` fixed the problem.

For the most part, I assumed MuPDF's svg and png conversion was
one-to-one.  My testing with small docx and Excel files went smooth so I
didn't think this feature warranted a NEWS entry.

>
>         Stefan

P.S. Sorry for the late reply, start of the semester had me busy.

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.