[pdftex] Multiple encodings for one font in pdftex.map

[Thanh Han The]

On Sun, Feb 27, 2011 at 4:26 PM, Jouni K. Sepp‰nen <jks at iki.fi> wrote:
> I am one of the maintainers of Matplotlib (a Python library for making
> plots in a way similar to Matlab). One of its features is that it can
> parse dvi files and embed their contents in its output (which can be
> pdf, or a number of other formats), so that those users who are
> embedding plots in TeX documents can set text strings using TeX and
> match the style of the document exactly.
>
> Now dvi files include references to TeX fonts, so we need a mapping from
> TeX fonts to fonts that can be embedded in pdf files (or used to draw on
> a bitmap). When implementing this feature I decided to reuse pdftex.map,
> since it is present in pretty much all modern TeX implementations and is
> well documented in the PDFTeX manual. The manual specifies the following
> format for lines in the map file:
>
> tfmname basename fontflags special encodingfile fontfile
>
> It further says that the three last fields can be in any order, and that
> the encodingfile field can be left out, but it does not say that there
> can be multiple encodingfile fields on one line. I added an assert in my
> code requiring there to be at most one of them.
>
> Some users are reporting that TeX Live 2010 installs a pdftex.map file
> that causes this assertion to fail:
>
> http://thread.gmane.org/gmane.comp.python.matplotlib.general/26250
>
> In this case, pdftex.map file included the line
>
> pbkdo8y URWBookmanL-DemiBold ".167 SlantFont TeXnANSIEncoding ReEncodeFont" <texnansi.enc <8r.enc <ubkd8a.pfb
>
> My questions are:
>
> 1) Is this a bug in TeX Live, or whichever program that caused this line
> to be written to pdftex.map?
>
> 2) What does PDFTeX do given this line? Does it e.g. simply choose one
> of the encoding files and apply that, or does it look into the encoding
> files and decide that since TeXnANSIEncoding was specified in pdftex.map
> and texnansi.enc defines an encoding by that name (and 8r.enc defines
> one named TeXBase1Encoding), texnansi.enc should be used?

pdftex ignores "TeXnANSIEncoding ReEncodeFont"; it looks
only at the encoding file(s). If multiple enc files are given,
the later overrides the first, hence 8r.enc is used in
this case.

Regards,
Thanh