Function parse_fixed_dynamic 

pub(crate) fn parse_fixed_dynamic(
    cursor: &mut Cursor<'_>,
) -> Result<(Fixed, i32), Error>

Parse a fixed point value with a dynamic scaling factor.

See https://gitlab.freedesktop.org/freetype/freetype/-/blob/f1cd6dbfa0c98f352b698448f40ac27e8fb3832e/src/cff/cffparse.c#L580