Re: How to enforce unicode font for all charsets?

[Sergey Organov <sorganov@gmail.com>]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Sergey Organov <sorganov@gmail.com>
>> Cc: help-gnu-emacs@gnu.org
>> Date: Fri, 13 Mar 2020 17:54:51 +0300
>> 
>> > Is the snapshot you installed using the HarfBuzz library?  (If it
>> > does, you should see it in the output of "C-u C-x =".)  If it doesn't,
>> > please try a build that does use HarfBuzz, which is now the default
>> > font backend in Emacs, before you decide that the issue still exists
>> > in the latest codebase.
>> 
>> I didn't built it myself and have no idea what HarfBuzz is, here is the
>> output of "C-u C-x =":
>> 
>> --- >8 ---
>>              position: 24 of 60 (38%), column: 23
>>             character: п (displayed as п) (codepoint 1087, #o2077, #x43f)
>>               charset: windows-1251 (WINDOWS-1251 (Cyrillic))
>> code point in charset: 0xEF
>>                script: cyrillic
>>                syntax: w 	which means: word
>>              category: .:Base, L:Left-to-right (strong), Y:2-byte Cyrillic, c:Chinese, h:Korean, j:Japanese, y:Cyrillic
>>              to input: type "C-x 8 RET 43f" or "C-x 8 RET CYRILLIC SMALL LETTER PE"
>>           buffer code: #xD0 #xBF
>>             file code: #xD0 #xBF (encoded by coding system utf-8-unix)
>>               display: by this font (glyph code)
>>     x:-xos4-terminus-medium-r-normal--16-160-72-72-c-80-microsoft-cp1251 (#xEF)
>
> The output for the other string, the one with the 'unicode' charset,
> is the telltale sign.  It shouldn't show "xft" before the font name.

It shows:

    ftcrhb:-PfEd-DejaVu Sans Mono-normal-normal-normal-*-15-*-*-*-m-0-iso10646-1 (#x37E)

so it must be HarfBuzz?

> Also, system-configuration-features should include "HARFBUZZ" if Emacs
> was built with HarfBuzz.

system-configuration-features is a variable defined in ‘C source code’.
Its value is

"XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND GPM DBUS GSETTINGS GLIB NOTIFY
INOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF
ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS PDUMPER LCMS2
GMP"

Yeah, it is.

-- Sergey