l3backend: adding new DVI specials?

[Zdenek Wagner]

Zdeněk Wagner
http://ttsm.icpf.cas.cz/team/wagner.shtml
http://icebearsoft.euweb.cz

pá 14. 2. 2020 v 6:22 odesílatel Joseph Wright
<joseph.wright at morningstar2.co.uk> napsal:
>
> On 13/02/2020 23:16, Karl Berry wrote:
> >      that's exactly what is happening.
> >
> > Oh. Well, good :). So how do dvipdfmx and dvisvgm come into it?
>
> If a user doesn't give a backend option in DVI mode, they get dvips. But
> if they are actually using dvipdfmx or dvisvgm (say with no graphics so
> not 'worrying'), then the latter has to deal with an 'unexpected'
> \special line.
>
It's a long time when I used DVI last time but if I remember the
specification well, if a DVI driver does not understand a \special, it
should emit a warning and ignore it.

> > Just to ignore the special in case the user gives them a dvi file that
> > was processed with backend=dvips (so to speak)?
>
> Yes
>
> Joseph
>