[pdftex] character width mismatch in font XY.vf ignored

[The Thanh Han]

On Sun, May 10, 2009 at 10:36:00PM +0200, Hartmut Henkel wrote:
> On Sun, 10 May 2009, Ulrike Fischer wrote:
> 
> > when I run the following document:
> >
> > \documentclass{article}
> > \pagestyle{empty}
> > \begin{document}
> > \fontsize{5cm}{6.2cm}
> > \fontencoding{T1}\fontfamily{pag}\selectfont
> > Test
> >
> > \end{document}
> >
> > I get a bundle of
> >           character width mismatch in font pagk8t.vf ignored
> > warnings.
> >
> > The warning is related to the font size, it starts when the font
> > size is about 4,5cm, so I think it is a rounding error somewhere. As
> > far as I can see all fonts which use a virtual font gives the same
> > warning (I tried with fourier, bera and various adobe fonts).
> >
> > The number of warning varies but seems to lay for T1-fonts somewhere
> > between 25-32.
> >
> > I get the warnings with lualatex (Version
> > snapshot-0.39.0-2009041523) to but not with dvips or
> > xelatex/xdvipdfmx).
> >
> > Is this a pdftex bug?

yes this is a pdftex bug, I submitted it to sarovar for record
http://sarovar.org/tracker/index.php?func=detail&aid=4288&group_id=106&atid=493

> seems two different functions are used for tfm/vf width calculation. In
> pdftex.web there is a macro store_scaled() for the tfm width, but for vf
> scaling some C function sqxfw() (borrowed from dvipdfm) is used, and
> they seem to behave slightly differently. Maybe if one would write a
> Pascal function wrapper around store_scaled (which is the exact,
> "official" TeX operation), one could get rid of sqxfw(). Just a wild
> guess.

Hartmut has made a patch to fix this (many thanks!),
which will be in the next release of pdftex (1.40.10).


Regards,
Thanh