Follow-up Comment #12, bug #58581 (project groff):
[comment #10 comment #10:]
> Hi Bjarni,
>
> [comment #4 comment #4:]
> > I read the definition of "unitwidth", so then I understood, that the
> > numbers in the font files are _relative_(!) to the "unitwidth" value.
> >
> > So the actual size of a space is "spacewidth / unitwidth" part of the
> > point size of the font.
>
> This reasoning does not work for, e.g., the utf8 device.
>
It does work.
Read the information about the "unitwidth".
Values in the font files are "normalized" with the value of "unitwidth".
So the formula is:
current spacewidth = spacewidth(font file) * (current type size) /
unitwidth
>
> Your formula would give an actual size of a space on the utf8 device of 2.4
times the point size.
>
And the type size is a single value "10 s" = "10 p".
So actually the unit for spacewidth is correct, but its value is based on
the prerequisite of
type size having the value "unitwidth".
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