From: Eli Zaretskii <eliz@gnu.org>
To: "Basil L. Contovounesios" <contovob@tcd.ie>
Cc: 34035@debbugs.gnu.org, stefan@marxist.se, craven@gmx.net
Subject: bug#34035: 26.1; Arabic shadda-kasrah renders incorrectly
Date: Wed, 19 Aug 2020 17:32:51 +0300 [thread overview]
Message-ID: <83ft8iemek.fsf@gnu.org> (raw)
In-Reply-To: <878seb12v1.fsf@tcd.ie> (contovob@tcd.ie)
> From: "Basil L. Contovounesios" <contovob@tcd.ie>
> Cc: Eli Zaretskii <eliz@gnu.org>, 34035@debbugs.gnu.org, Peter
> <craven@gmx.net>
> Date: Wed, 19 Aug 2020 09:01:06 +0100
>
> The kasrah is shown below the sin:
>
> [...]
>
> Composed with the following character(s) "ِّ" using this font:
> xfthb:-PfEd-DejaVu Sans Mono-normal-normal-normal-*-26-*-*-*-m-0-iso10646-1
> by these glyphs:
> [0 2 1616 1153 16 4 12 0 4 [0 6 0]]
> [0 2 1617 1154 16 3 12 23 -15 [0 2 0]]
> [0 2 1587 1129 16 -4 15 10 7 nil]
>
> Character code properties: customize what to show
> name: ARABIC LETTER SEEN
> general-category: Lo (Letter, Other)
> decomposition: (1587) ('س')
>
> [...]
>
> The kasrah is shown above the sin:
>
> [...]
>
> Composed with the following character(s) "ِّ" using this font:
> xfthb:-PfEd-DejaVu Sans-normal-normal-semicondensed-*-26-*-*-*-*-0-iso10646-1
> by these glyphs:
> [0 2 1616 6022 0 2 10 27 -15 [1 5 0]]
> [0 2 1617 1377 29 1 27 10 7 nil]
>
> Character code properties: customize what to show
> name: ARABIC LETTER SEEN
> general-category: Lo (Letter, Other)
> decomposition: (1587) ('س')
Which seems to clearly indicate that this _is_ font-dependent, right?
Moreover, it seems also to hint on the reason for the issue: the
correct display uses only 2 glyphs, whereas the incorrect display uses
3 glyphs. Which means -- and that matches my observations on my
systems -- that the "good" font has a precomposed glyph for
shadda-kasrah, while the "bad" font doesn't. And the composition data
in the latter case indicates that we were told to display the kasrah
below the base character (the descent value is positive).
Can someone please see what HarfBuzz's hb-view produces from these
glyphs, with the same fonts as you see in Emacs? If hb-view produces
the same display for the same fonts, then it's not an Emacs problem,
and we should ask the HarfBuzz developers what, if anything, HarfBuzz
can do better for the problematic fonts. And if hb-view does better
than Emacs, then we should ask the HarfBuzz developers to help us
understand what we do incorrectly in this case.
next prev parent reply other threads:[~2020-08-19 14:32 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-10 17:20 bug#34035: 26.1; Arabic shadda-kasrah renders incorrectly Peter
2019-01-10 18:55 ` Eli Zaretskii
2019-01-10 19:45 ` Peter
2019-01-10 19:52 ` Eli Zaretskii
2019-01-10 20:05 ` Peter
2019-01-11 9:24 ` Stephen Berman
2019-01-11 9:30 ` Eli Zaretskii
2019-01-11 9:47 ` Stephen Berman
2019-01-11 10:34 ` Eli Zaretskii
2019-01-11 10:54 ` Stephen Berman
2019-01-11 13:30 ` Eli Zaretskii
2019-01-11 16:14 ` Stephen Berman
2020-08-18 18:11 ` Stefan Kangas
2020-08-19 8:01 ` Basil L. Contovounesios
2020-08-19 9:07 ` Stephen Berman
2020-08-19 9:49 ` Stefan Kangas
2020-08-19 10:48 ` Basil L. Contovounesios
2020-08-19 14:54 ` Eli Zaretskii
2020-08-19 16:20 ` Basil L. Contovounesios
2020-08-19 16:58 ` Eli Zaretskii
2020-09-18 10:02 ` Stefan Kangas
2020-08-19 14:32 ` Eli Zaretskii [this message]
2020-08-19 16:18 ` Basil L. Contovounesios
2020-08-19 17:11 ` Eli Zaretskii
2020-08-20 0:59 ` Basil L. Contovounesios
2020-08-23 6:41 ` James Cloos
2020-08-23 7:15 ` Eli Zaretskii
2020-08-23 9:26 ` Stephen Berman
2020-08-23 11:36 ` Eli Zaretskii
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: https://www.gnu.org/software/emacs/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=83ft8iemek.fsf@gnu.org \
--to=eliz@gnu.org \
--cc=34035@debbugs.gnu.org \
--cc=contovob@tcd.ie \
--cc=craven@gmx.net \
--cc=stefan@marxist.se \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.savannah.gnu.org/cgit/emacs.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).