writing a new cups driver

[greg strockbine]

I'm writing a cups driver for a non-postscript
printer.  The printer has it's own command set,
but it's not PCL or ESC/P.

I have this line in my ppd file:

Filter application/vnd.cups-raster 0 rastertomydriver

I only seem to be able to send gifs, jpgs, etc using
this filter.  I'm kind of confused about how I would
send a document that would have text and graphics.
I guess I was thinking such a document would be converted
to raster data and my driver would only have to deal with
that.

I suppose I'm still confused about the path a text+graphics
file takes through cups.  I have the cups book and have also
gone through the on line docs, but I can't seem to get a
handle on this.

any suggestions?
thanks,
greg strockbine