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 15:17:42 +0300 [thread overview]
Message-ID: <834jk3v8ux.fsf@gnu.org> (raw)
In-Reply-To: <87wmx0dbn6.fsf@yahoo.com> (message from Po Lu on Fri, 08 Sep 2023 21:42:37 +0800)
> From: Po Lu <luangruo@yahoo.com>
> Cc: Shingo Tanaka <shingo.fg8@gmail.com>, 65803@debbugs.gnu.org
> Date: Fri, 08 Sep 2023 21:42:37 +0800
>
> For a nominally monospace font, the ft*font backends infer the average
> from the width of the space glyph, instead of giving undue credence to
> its reported ``average width''. CJK fonts customarily contain tens of
> thousands of glyphs, of which only a small subset represent ASCII
> ``monospace'' characters relevant to Emacs, but the `tmAveCharWidth'
> field, which is derived from the font's OS/2 table:
>
> https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6OS2.html
>
> represents the average width of all the glyphs within the font, and is
> ergo naturally biased towards the large number of CJK glyphs
> incorporated within the font. The W32 backend should either infer the
> average width itself, or ground it upon on the width of the space glyph.
> Refer to this code in ftfont_open:
>
> font->min_width = font->average_width = font->space_width = 0;
> for (i = 32, n = 0; i < 127; i++)
> if (FT_Load_Char (ft_face, i, FT_LOAD_DEFAULT) == 0)
> {
> int this_width = ft_face->glyph->metrics.horiAdvance >> 6;
>
> if (this_width > 0
> && (! font->min_width || font->min_width > this_width))
> font->min_width = this_width;
> if (i == 32)
> font->space_width = this_width;
> font->average_width += this_width;
> n++;
> }
> if (n > 0)
> font->average_width /= n;
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?
next prev parent reply other threads:[~2023-09-09 12:17 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 [this message]
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
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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