[tex-live] bug in dvipdfmx wrt diacritics?

Zdenek Wagner zdenek.wagner at gmail.com
Sat Sep 10 23:12:16 CEST 2011

2011/9/10 Reinhard Kotucha <reinhard.kotucha at web.de>:
> On 2011-09-09 at 22:44:33 +0900, Akira Kakuto wrote:
>  > Hi Norbert,
>  >
>  > > \documentclass{article}
>  > > \usepackage[T1]{fontenc}
>  > > \usepackage{charter}
>  > > \begin{document}
>  > > chass\'e du G\"obe
>  > > \end{document}
>  >
>  > Please try by removing the line
>  > \usepackage[T1]{fontenc}
>  >
>  > Probably the encoding should be the standard encoding for a SEAC,
>  > since dvipdfmx uses type 1C.
> AFAIK the actual encoding of the font doesn't matter.  Glyphs within
> Type 1 fonts have a name and an encoding vector is just an array of
> such names.
> The seac routine, however, takes numbers as arguments.  And these
> numbers denote slot numbers in the StandardEncoding array.  It doesn't
> mean that the font has to use StandardEncoding itself since every font
> renderer must have StandardEncoding built-in.  A font doesn't have to
> provide an encoding vector at all.  It's sufficient to provide a line
>  /Encoding StandardEncoding def
> within the font.  A font may provide more glyphs than StandardEncoding
> supports.  In order to access them, it has to be re-encoded.  This is
> what the fontenc package does.  As far as the seac routine is

No, this is not the job of the fontenc package. This package assigns
slots for characters using \DeclareTextSymbol and
\DeclareTextComposite. Thus for instance \'a may occupy different
slots in different encodings. It also defines slots for accents using
\DeclareTextAccent. This is used if a composite is not available in
the encoding. Characters are then build using the \accent primitive.
You can see in the TeXbook that accents occupy different slots in OT1
and T1. The map file then defines the binding between the TeX name and
PS name + font file name. If needed, encoding vector is specified.
Reencoding is then achieved by making a copy of the font and inserting
the encoding vector into it. It is not possible to insert the encoding
vector into the original font because the fonts are read only

> ...

Zdeněk Wagner

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