> The fields minimum, def, and maximum are 16.16 fractional values for
> TrueType GX and OpenType variation fonts. For Adobe MM fonts, the
> values are integers.
>
> Does this mean those variables are represented as 16.16 fractional
> numbers or integers in some cases?
Correct.
> If so, how can I recognize if it is GX/OpenType fonts or Adobe MM
> fonts?
Basically, it doesn't make a difference. Either all three variables
`minimum`, `def, and `maximum` are in 16.16 format, or all of them are
integers. It's just a matter how to report them to the user.
If macro `FT_IS_SFNT` returns false, you have an Adobe MM font.
> Someone reported Apple's SF Pro font has wider kerning after the
> following code added to fontconfig: [...]
The division by 65536 looks right.
> So I'm wondering if they may have opsz in integers.
AFAIK, no.
Werner
