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bug#28236: 'configure --with-cairo' causes 'emacs -font' to fail
From: |
Robert Pluim |
Subject: |
bug#28236: 'configure --with-cairo' causes 'emacs -font' to fail |
Date: |
Thu, 13 Dec 2018 12:34:54 +0100 |
Eli Zaretskii <eliz@gnu.org> writes:
>> From: Robert Pluim <rpluim@gmail.com>
>> Cc: Ari Roponen <ari.roponen@gmail.com>, 28236@debbugs.gnu.org,
>> andrei.elkin@pp.inet.fi, dgutov@yandex.ru
>> Date: Wed, 12 Dec 2018 16:41:52 +0100
>>
>> Eli Zaretskii <eliz@gnu.org> writes:
>>
>> > So you are saying that the problem here is that Cairo can only work
>> > with fonts known fontconfig, and cannot switch to font backend(s) that
>> > bypass fontconfig? If so, perhaps just an entry in PROBLEMS with the
>> > above recipe would suffice as a workaround?
>>
>> I find that surprising. The non-Cairo GTK build can use Xft and X font
>> backends, what's different about Cairo?
>>
>> (I just tried to set font-backend to '(ftcr x) on my Cairo build, and
>> failed, so perhaps it really isnʼt supported).
>
> I'm guessing that the other font backends use X calls that cannot be
> supported with Cairo drawing, or maybe such support simply wasn't
> coded yet. But I'm not an expert on this stuff, so maybe I'm wrong.
So xfns.c only initializes the xfont driver when not using Cairo. I
made the obvious changes there, and 'emacs -Q -fn 7x14' starts up, and
'C-u C-x =' tells me:
x:-misc-fixed-medium-r-normal--14-130-75-75-c-70-iso8859-1 (#x68)
Unfortunately *scratch* does not (re-)display properly [1], so unless
weʼre feeling really adventurous, we probably shouldn't enable both
Cairo and the X font back on master, etc/PROBLEMS (or NEWS?) might be
better.
Robert
Footnotes:
[1] Admittedly this is over an ssh forwarded connection. Running it
locally might look better.
- bug#28236: 'configure --with-cairo' causes 'emacs -font' to fail, Dmitry Gutov, 2018/12/10
- bug#28236: 'configure --with-cairo' causes 'emacs -font' to fail, Eli Zaretskii, 2018/12/11
- bug#28236: 'configure --with-cairo' causes 'emacs -font' to fail, Ari Roponen, 2018/12/12
- bug#28236: 'configure --with-cairo' causes 'emacs -font' to fail, Eli Zaretskii, 2018/12/12
- bug#28236: 'configure --with-cairo' causes 'emacs -font' to fail, Robert Pluim, 2018/12/12
- bug#28236: 'configure --with-cairo' causes 'emacs -font' to fail, Eli Zaretskii, 2018/12/12
- bug#28236: 'configure --with-cairo' causes 'emacs -font' to fail,
Robert Pluim <=
- bug#28236: 'configure --with-cairo' causes 'emacs -font' to fail, Eli Zaretskii, 2018/12/13
- bug#28236: 'configure --with-cairo' causes 'emacs -font' to fail, Robert Pluim, 2018/12/13