Intolerable difference in glyph width: font=vnbx12

[The Thanh Han]

On Wed, Oct 20, 2021 at 12:01 AM Werner LEMBERG <wl at gnu.org> wrote:

>
> > > * Fix the widths by using `t1disasm` + manual editing + `t1asm`.
> > >   A skilled user might even write a script to automate the manual
> > >   editing part, i.e., taking the width of the 'u' glyph from the
> > >   disassembled output and replacing the widths of all other
> > >   occurrences of 'u + accent(s)'.
> >
> > this is what I had in mind too but it takes some time.  There are some
> > other things which should be fixed too.
> >
> >   \font\v=vnr12 at 1000pt \v
> >   \setbox0\hbox{0}
> >   \showthe\wd0
> >
> >   > 489.4638pt.
> >   l.8 \showthe\wd0
> >
> > The tfm file contains (CHARWD R 0.489464).  This looks fine so far
> >
> >   489.464pt * 72.27/72 = 491.29949bp
> >
> > but the pfb file contains
> >
> >   /zero {
> >       41 490 hsbw
> >
> > There are many of such rounding errors in the font.  I assume that
> > it's best to replace all widths in the pfb files by values derived
> > from the tfm files.
>
> Yes.  Ideally, the values are rational approximations, similar to what
> is done in the cmsuper fonts, for example
>
>   41 4913 10 div hsbw
>
>
a side note: actually the original values in pfb fonts by BlueSky were in
this form; but I had to convert them
to get rid of those "div" because some of the FMP tool didn't not work with
them

Regards,
Thanh
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