GNU bug report logs - #65803
29.1; Noto Sans Mono CJK JP has doubled-width on Windows

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Message #50 received at 65803 <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 65803 <at> debbugs.gnu.org, shingo.fg8 <at> gmail.com
Subject: Re: bug#65803: 29.1; Noto Sans Mono CJK JP has doubled-width on
 Windows
Date: Sat, 09 Sep 2023 21:38:32 +0800

Eli Zaretskii <eliz <at> 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);

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

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