Fontconfig has a modular design, allowing each font to contribute its own font substitution rules and workarounds, without requiring the maintenance of a large centralised static ruleset. However that also means a single package with broken rules can destabilise font priorities and make them less than awesome.
- try to find a packageset that works and packageset that does not
- compare the output of:
fc-match -s :family=<name>:lang=<loc>in both cases, with <name> the font family you requested and <loc> the target locale.
- if necessary, identify more precisely the problem font,
- examine the fontconfig rules shipped with the problem package,
- report your findings.
- default rules provided by fontconfig upstream,
- rules written by Fedora packagers using our own templates: install fontpackages-devel and look in /usr/share/fontconfig/templates/,
- rules written by Fedora packagers without regard for our templates,
- rules written by font projects.
- While trying to:
- workaround KDE/QT fontconfig processing bugs,
- make sure one's font is the default for some languages,
- make sure one's font rendering preferences are default for one font,
- For example sans, serif…
- For example ja-jp, zh, etc.
- Install fontpackages-devel and look in /usr/share/fontconfig/templates/, to check the default fontconfig patterns used in Fedora.