From: Dmitry Alexandrov <321942@gmail.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 25216@debbugs.gnu.org
Subject: bug#25216: 26.0.50 [regression]; Curly quotes are not found in some sizes of ‘Terminus’ font
Date: Sat, 31 Dec 2016 08:56:21 +0300 [thread overview]
Message-ID: <87k2agfxq2.fsf@gmail.com> (raw)
In-Reply-To: <838trb46jg.fsf@gnu.org> (Eli Zaretskii's message of "Tue, 20 Dec 2016 05:34:59 +0200")
>> > And I still don't understand why you need that. AFAICS, Emacs
>> > explicitly tries to use the default font for punctuation and symbol
>> > characters before falling back on looking up other fonts.
>>
>> Do you mean that you could not reproduce this?
>
> It means I don't understand how it could happen. The function
> face_for_char (defined in fontset.c) explicitly tries the current
> default font for any punctuation and symbol character, before it
> starts looking in other fonts. I don't understand why this fails for
> you, and only in certain font sizes on top of that. Perhaps you could
> step through that code with a debugger and see what happens there?
Well. font_has_char of font.c:2989 returns 0 ← xftfont_has_char of xftfont.c:532 returns 0 ← XftCharExists of libXft.so.2 returns 0.
So the problem goes into libxft2.
Thus the possible workaround may be to prefer ‘x’ backend for font rendering:
$ emacs -q -fn '-*-terminus-*-18-*-iso10646-1' -xrm 'emacs.fontBackend: x,xft'
However, by a fluke dropping ‘x’ entirely also conceals the issue at least on my system:
$ emacs -q -fn '-*-terminus-*-18-*-iso10646-1' -xrm 'emacs.fontBackend: xft'
Only that (which is presumably the default) leads to the problem:
$ emacs -q -fn '-*-terminus-*-18-*-iso10646-1' -xrm 'emacs.fontBackend: xft,x'
At least it’s now clear what’s so special about combination of Terminus and GNU Emacs — the former it is a rare example of a font that is available through both of font engines, the latter — of an application that uses both of them.
next prev parent reply other threads:[~2016-12-31 5:56 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-17 1:03 bug#25216: 26.0.50 [regression]; Curly quotes are not found in some sizes of ‘Terminus’ font Dmitry Alexandrov
2016-12-17 8:18 ` Eli Zaretskii
2016-12-17 9:33 ` Dmitry Alexandrov
2016-12-17 11:02 ` Eli Zaretskii
2016-12-19 3:17 ` Dmitry Alexandrov
2016-12-19 3:42 ` Eli Zaretskii
2016-12-19 4:52 ` Dmitry Alexandrov
2016-12-19 16:11 ` Eli Zaretskii
2016-12-19 3:44 ` Eli Zaretskii
2016-12-19 4:53 ` Dmitry Alexandrov
2016-12-19 17:46 ` Eli Zaretskii
2016-12-19 6:14 ` Dmitry Alexandrov
2016-12-19 16:15 ` Eli Zaretskii
2016-12-20 2:51 ` Dmitry Alexandrov
2016-12-20 3:34 ` Eli Zaretskii
2016-12-31 5:56 ` Dmitry Alexandrov [this message]
2016-12-31 8:57 ` Eli Zaretskii
2019-11-17 7:41 ` Lars Ingebrigtsen
2019-11-17 8:38 ` Dmitry Alexandrov
2019-11-17 16:01 ` Eli Zaretskii
2019-11-20 15:01 ` Dmitry Alexandrov
2019-11-25 16:16 ` Eli Zaretskii
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