Provided by: libfontconfig-doc_2.13.1-4.4ubuntu1_all 
NAME
FcPatternFilter - Filter the objects of pattern
SYNOPSIS
#include <fontconfig/fontconfig.h>
FcPattern * FcPatternFilter (FcPattern *p, const FcObjectSet *);
DESCRIPTION
Returns a new pattern that only has those objects from p that are in os. If os is NULL, a
duplicate of p is returned.