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bug#65803: 29.1; Noto Sans Mono CJK JP has doubled-width on Windows
From: |
Eli Zaretskii |
Subject: |
bug#65803: 29.1; Noto Sans Mono CJK JP has doubled-width on Windows |
Date: |
Sat, 09 Sep 2023 15:17:42 +0300 |
> 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?
- bug#65803: 29.1; Noto Sans Mono CJK JP has doubled-width on Windows, (continued)
- bug#65803: 29.1; Noto Sans Mono CJK JP has doubled-width on Windows, Eli Zaretskii, 2023/09/07
- bug#65803: 29.1; Noto Sans Mono CJK JP has doubled-width on Windows, Shingo Tanaka, 2023/09/07
- bug#65803: 29.1; Noto Sans Mono CJK JP has doubled-width on Windows, Eli Zaretskii, 2023/09/08
- bug#65803: 29.1; Noto Sans Mono CJK JP has doubled-width on Windows, Shingo Tanaka, 2023/09/08
- bug#65803: 29.1; Noto Sans Mono CJK JP has doubled-width on Windows, Eli Zaretskii, 2023/09/08
- bug#65803: 29.1; Noto Sans Mono CJK JP has doubled-width on Windows, Po Lu, 2023/09/08
- bug#65803: 29.1; Noto Sans Mono CJK JP has doubled-width on Windows, Werner LEMBERG, 2023/09/08
- bug#65803: 29.1; Noto Sans Mono CJK JP has doubled-width on Windows, Eli Zaretskii, 2023/09/09
- bug#65803: 29.1; Noto Sans Mono CJK JP has doubled-width on Windows, Po Lu, 2023/09/09
- bug#65803: 29.1; Noto Sans Mono CJK JP has doubled-width on Windows, Eli Zaretskii, 2023/09/09
- bug#65803: 29.1; Noto Sans Mono CJK JP has doubled-width on Windows,
Eli Zaretskii <=
- bug#65803: 29.1; Noto Sans Mono CJK JP has doubled-width on Windows, Po Lu, 2023/09/09
- bug#65803: 29.1; Noto Sans Mono CJK JP has doubled-width on Windows, Eli Zaretskii, 2023/09/09
- bug#65803: 29.1; Noto Sans Mono CJK JP has doubled-width on Windows, Eli Zaretskii, 2023/09/09
- bug#65803: 29.1; Noto Sans Mono CJK JP has doubled-width on Windows, Po Lu, 2023/09/09
- bug#65803: 29.1; Noto Sans Mono CJK JP has doubled-width on Windows, Eli Zaretskii, 2023/09/10
- bug#65803: 29.1; Noto Sans Mono CJK JP has doubled-width on Windows, Po Lu, 2023/09/10
- bug#65803: 29.1; Noto Sans Mono CJK JP has doubled-width on Windows, Eli Zaretskii, 2023/09/10
- bug#65803: 29.1; Noto Sans Mono CJK JP has doubled-width on Windows, Po Lu, 2023/09/10
- bug#65803: 29.1; Noto Sans Mono CJK JP has doubled-width on Windows, Eli Zaretskii, 2023/09/10
- bug#65803: 29.1; Noto Sans Mono CJK JP has doubled-width on Windows, Po Lu, 2023/09/10