[AUCTeX] Preview: baselines and dvi specials

[Andrew Hoefel]

I'm trying to use the preview package for taking latex equations and
converting them to svg through dvi. There are a lot of drivers that
produce svg files, but I can't find one that produces baseline
information. Dvipng, on the other hand, does give baseline
information.

My understanding is that the tightpage option spits out dvi specials
and this is how dvipng computes its baseline. Is this right? I'm
looking at specials like the following:

ps::-32891 -32891 32891 32891 521949 0 945438

Can anyone tell me how to interpret these numbers? Also, it is best
for dvi drivers to read these specials, or could an option to preview
be made to report baselines?

Thanks,
Andrew Hoefel