[Fontconfig] FcPattern Gotcha
ldo at geek-central.gen.nz
Tue Nov 29 02:19:36 UTC 2016
Having found a FreeType font, Fontconfig provides the call
FcFreeTypeQueryFace, which will construct a very elaborate pattern that,
I assumed, would match exactly that font again.
However, it never seemed to work: trying to use that pattern to search
for fonts would always fail with no matches.
I figured out that the problem seems to come from the inclusion
of the “lang” and “charset” criteria in the returned pattern: the
values for these tend to consist of long lists of items separated by “|”
characters. But remove them, and the resulting pattern will correctly
find the font again.
More information about the Fontconfig