[bug #58581] doc/groff.texi, man/groff_font.5.man: spacewidth value has incorrect units

[Bjarni Ingi Gislason]

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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