https://bugzilla.redhat.com/show_bug.cgi?id=1836987
Bug ID: 1836987
Summary: Font descent miscalculated for some applications
Product: Fedora
Version: 32
Status: NEW
Component: dejavu-fonts
Assignee: nicolas.mail...@laposte.net
Reporter: mc...@redhat.com
QA Contact: extras...@fedoraproject.org
CC: fonts-bugs@lists.fedoraproject.org,
nicolas.mail...@laposte.net, p...@frixxon.co.uk,
pe...@thecodergeek.com
Target Milestone: ---
Classification: Fedora
Created attachment 1689621
--> https://bugzilla.redhat.com/attachment.cgi?id=1689621&action=edit
See the letters like 'j', 'g', 'y', which are cut
When I install hexchat (hexchat-2.14.3-3.fc32.x86_64) it has preselected in
Settings->Preferences font "Monospace 9". It seems to be mapped to Dejavu font
in Fedora 32, according to:
$ fc-match monospace
DejaVuSansMono.ttf: "DejaVu Sans Mono" "Regular"
I have installed dejavu-sans-mono-fonts-2.37-7.fc32.noarch and the font in
hexchat has cut the text vertically, the bottom part of the line, some part
below the base line, is missing.
I guess it's due to misreported descent for the font, possibly some fraction,
which, when recalculated to pixels, rounds down, causing the pixel cut. This is
even more problematic for an underscore ('_'), which is not visible at all,
because it's at the very bottom of the font height, thus it looks like a space,
not underscore.
I see this in more applications, not only with hexchat, thus it might not be a
problem in there.
I also see this with other fonts, like with:
VeraMono.ttf: "Bitstream Vera Sans Mono" "Regular"
thus, maybe, it's even lower in the stack.
I worked around this in my editor by adding one pixel to
pango_font_metrics_get_descent() / PANGO_SCALE
but it's only a workaround.
I've also Fedora 30 machine and it has installed:
dejavu-sans-mono-fonts-2.37-1.fc30.noarch
and the hexchat shows lines properly. It also says:
$ fc-match monospace
DejaVuSansMono.ttf: "DejaVu Sans Mono" "Book"
I've also a Fedora 31 machine, which has installed:
dejavu-sans-mono-fonts-2.37-2.fc31.noarch
and hexchat is similarly broken as in Fedora 32. It says:
$ fc-match monospace
DejaVuSansMono.ttf: "DejaVu Sans Mono" "Book"
Looking in the package history in koji, there was not done any real change
between 2.37-1 and 2.37-2.
Thus, maybe, it is nothing new.
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