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bug#54646: 29.0.50; set-fontset-font and font clipping issues
From: |
Visuwesh |
Subject: |
bug#54646: 29.0.50; set-fontset-font and font clipping issues |
Date: |
Sun, 12 Jun 2022 13:17:26 +0530 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) |
[ஞாயிறு ஜூன் 12, 2022 08:53] Eli Zaretskii wrote:
>> From: Visuwesh <visuweshm@gmail.com>
>> Cc: rpluim@gmail.com, 54646@debbugs.gnu.org
>> Date: Sat, 11 Jun 2022 19:24:16 +0530
>>
>> I think this might be a cairo+pango problem.
>
> I don't see how Pango could be relevant: AFAIK we don't use any of it
> in Emacs.
>
I was under the impression that cairo used pango somewhere but,
% ldd /usr/lib/x86_64-linux-gnu/libcairo.so.2 |grep pango
returned nothing. However,
% ldd $(which emacs) |grep pango
libpangocairo-1.0.so.0 =>
/lib/x86_64-linux-gnu/libpangocairo-1.0.so.0 (0x00007f1c4401f000)
libpango-1.0.so.0 => /lib/x86_64-linux-gnu/libpango-1.0.so.0
(0x00007f1c43fb9000)
libpangoft2-1.0.so.0 => /lib/x86_64-linux-gnu/libpangoft2-1.0.so.0
(0x00007f1c4363f000)
> It could be a Cairo issue, in which case it is somewhere in the bowels
> of Cairo, not in Emacs code proper.
>
>> My suspicion is due to this bug report
>> https://github.com/harfbuzz/harfbuzz/issues/1892 -- although I don't
>> see the problem with English text as shown in the screenshots.
>
> If this is the same issue, how come you sometimes see correctly laid
> out text and sometimes incorrectly laid out text? Emacs doesn't
> change anything in both situation, and I'm not aware of any handling
> of "hinting" on our side.
AFAIU, the issue shows itself when Emacs renders some part of the Tamil
characters and but not all. This is a common case in eww: <hN> headers
are rendered in a slightly larger font size than the main body text.
Anyway, I don't think it is the same issue, but what I wanted to convey
by quoting that bug report is that it made suspect that the problem
might be in cairo or pango.