FcFontMatch (3) - Linux Man Pages
FcFontMatch: Return best font
FcFontMatch - Return best font
Finds the font in sets most closely matching pattern and returns the result of FcFontRenderPrepare for that font and the provided pattern. This function should be called only after FcConfigSubstitute and FcDefaultSubstitute have been called for p; otherwise the results will not be correct. If config is NULL, the current configuration is used.