From: Werner LEMBERG <wl@gnu.org>
To: eliz@gnu.org
Cc: 31315@debbugs.gnu.org
Subject: bug#31315: wrong font encoding for fallback font
Date: Fri, 04 May 2018 07:11:37 +0200 (CEST) [thread overview]
Message-ID: <20180504.071137.973726089728856021.wl@gnu.org> (raw)
In-Reply-To: <83vac4o6hr.fsf@gnu.org>
>> Alas, my Elisp knowledge is ... well ... not impressive.
>> Basically, I'm just an Emacs user, not an Emacs developer.
>
> Almost all of the relevant code is in C, not in Lisp.
OK.
>> With Xft, there is no possibility for improvement IMHO. The
>> probably best choice is to switch to Pango for font access (in case
>> you don't do that already).
>
> There are several back-ends besides Xft, the most advanced being
> xftfont.c. They all didn't see any serious development for the past
> several years. And yes, acquiring new back-ends is also a worthy
> goal.
>
> All of that requires a level of expertise that IMO we currently
> don't have.
What I can certainly offer is advice. However, I'm not sure to be
right person for working on the innards of Emacs, given the usual lack
of time (sigh).
>> An Emacs charset essentially triggers a language and script
>> setting, and those two parameters can be passed to Pango, AFAIK.
>
> Emacs handles charsets and scripts separately. A script is matched
> against OTF/TTF features of fonts to make sure the necessary shaping
> features required by a script are supported.
Interesting. Access to OpenType features is exactly what's needed to
improve font display for selected charsets. Where can I find the
related code in Emacs?
Additionally, I suggest that the Emacs maintainers set up a GSoC
project, namely to improve font rendering. This is a broad topic,
which could be further split into smaller subprojects.
Emacs uses Handa-san's libotf library (are there any other projects
that use this library?), but AFAICS it doesn't receive a lot of
testing. On the other hand, there is Behdad Esfahbod's `HarfBuzz'
shaping engine that comes with a large suite of tests. One of such
subprojects could be to take these tests and use them to improve
libotf, especially for Indic scripts.
https://www.freedesktop.org/wiki/Software/HarfBuzz/
Werner
next prev parent reply other threads:[~2018-05-04 5:11 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-30 7:21 bug#31315: wrong font encoding for fallback font Werner LEMBERG
2018-04-30 15:13 ` Eli Zaretskii
2018-04-30 15:42 ` Andreas Schwab
2018-04-30 19:26 ` Eli Zaretskii
2018-04-30 20:03 ` Andreas Schwab
2018-05-01 2:37 ` Eli Zaretskii
2018-05-01 6:47 ` Werner LEMBERG
2018-05-01 8:13 ` Andreas Schwab
2018-05-01 9:11 ` Werner LEMBERG
2018-05-01 15:00 ` Eli Zaretskii
2018-05-01 17:42 ` Andreas Schwab
2018-05-05 8:57 ` Eli Zaretskii
2018-05-01 6:36 ` Werner LEMBERG
2018-05-01 15:22 ` Eli Zaretskii
2018-05-01 19:30 ` Werner LEMBERG
2018-05-02 7:27 ` Werner LEMBERG
2018-05-02 15:22 ` Eli Zaretskii
2018-05-03 5:52 ` Werner LEMBERG
2018-05-03 17:48 ` Eli Zaretskii
2018-05-03 19:05 ` Werner LEMBERG
2018-05-03 19:59 ` Eli Zaretskii
2018-05-04 5:11 ` Werner LEMBERG [this message]
2018-05-04 13:05 ` Eli Zaretskii
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