Fetches the units-per-em (UPEM) value of the specified face object.
Typical UPEM values for fonts are 1000, or 2048, but any value in between 16 and 16,384 is allowed for OpenType fonts.
A face object
The upem value of face
Fetches the units-per-em (UPEM) value of the specified face object.
Typical UPEM values for fonts are 1000, or 2048, but any value in between 16 and 16,384 is allowed for OpenType fonts.