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From: Eli Zaretskii <eliz@gnu.org>
To: Po Lu <luangruo@yahoo.com>
Cc: 65803@debbugs.gnu.org, shingo.fg8@gmail.com
Subject: bug#65803: 29.1; Noto Sans Mono CJK JP has doubled-width on Windows
Date: Sat, 09 Sep 2023 17:39:56 +0300	[thread overview]
Message-ID: <83tts3tnpf.fsf@gnu.org> (raw)
In-Reply-To: <87wmwzbh5z.fsf@yahoo.com> (message from Po Lu on Sat, 09 Sep 2023 21:38:32 +0800)

> From: Po Lu <luangruo@yahoo.com>
> Cc: shingo.fg8@gmail.com,  65803@debbugs.gnu.org
> Date: Sat, 09 Sep 2023 21:38:32 +0800
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Thanks, but the above snippet in ftfont.c is only done for
> > proportional fonts, not for fixed-pitch fonts.  Is the font in
> > question, Noto Sans Mono CJK JP, a proportional font?  That is, does
> > it not set the fixed-pitch attribute?
> 
> There's no spacing attribute in TrueType fonts, so that is contingent
> upon how the MS Windows font scaler detects fixed pitch fonts.  Here's
> how ftfont.c calculates the average width for fonts that Fontconfig
> deems fixed pitch:
> 
>     font->min_width = font->average_width = font->space_width
>       = (scalable ? ft_face->max_advance_width * size / upEM + 0.5
> 	 : ft_face->size->metrics.max_advance >> 6);

What is metrics.max_advance, in terms of the attributes recorded in
the font file?

> That aside, Fontconfig does not judge Noto Sans Mono CJK JP a fixed
> pitch font on my system.

OK, that might explain part of the issue, thanks.





  reply	other threads:[~2023-09-09 14:39 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-09-07 13:38 bug#65803: 29.1; Noto Sans Mono CJK JP has doubled-width on Windows Shingo Tanaka
2023-09-07 13:50 ` Eli Zaretskii
2023-09-07 14:24   ` Shingo Tanaka
2023-09-07 14:40     ` Eli Zaretskii
2023-09-07 14:57       ` Eli Zaretskii
2023-09-07 23:19         ` Shingo Tanaka
2023-09-08  6:25           ` Eli Zaretskii
2023-09-07 22:26             ` Shingo Tanaka
2023-09-08 12:18               ` Eli Zaretskii
2023-09-08 13:42                 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-08 14:49                   ` Werner LEMBERG
2023-09-09 12:51                     ` Eli Zaretskii
2023-09-09 13:42                       ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-09 14:45                         ` Eli Zaretskii
2023-09-09 12:17                   ` Eli Zaretskii
2023-09-09 13:38                     ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-09 14:39                       ` Eli Zaretskii [this message]
2023-09-09 14:57                       ` Eli Zaretskii
2023-09-10  1:00                         ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-10  5:22                           ` Eli Zaretskii
2023-09-10  5:36                             ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-10  5:42                               ` Eli Zaretskii
2023-09-10  5:55                                 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-10  6:48                                   ` Eli Zaretskii
2023-09-10  7:31                                     ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-10  7:53                                       ` Eli Zaretskii
2023-09-10  7:55                                         ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-10  8:01                                           ` Eli Zaretskii
2023-09-10  8:08                                             ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-10  8:19                                               ` Eli Zaretskii
2023-09-10  8:31                                                 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-10  8:50                                                   ` Eli Zaretskii
2023-09-10  9:30                                                     ` Eli Zaretskii
2023-09-10 11:29                                                       ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-10 11:44                                                         ` Eli Zaretskii
2023-09-10 12:09                                                           ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-10 12:43                                                             ` Eli Zaretskii
2023-09-10 12:39                                               ` Shingo Tanaka

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