<div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">Thanks! This is what I was looking for. You indeed uncovered me having been sleeping in a cave for the last 20 years. ;-) </div><div class="gmail_extra"> <div class="gmail_default" style="font-family:arial,helvetica,sans-serif">Dov</div> <div class="gmail_quote">On Thu, Aug 20, 2015 at 12:50 AM, Adrian Johnson <<a href="mailto:ajohnson@redneon.com" target="_blank">ajohnson@redneon.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On 19/08/15 22:41, Dov Grobgeld wrote: > I have recently ported my line printing program paps > (http;//<a href="http://github.com/dov/paps" rel="noreferrer" target="_blank">github.com/dov/paps</a> <<a href="http://github.com/dov/paps" rel="noreferrer" target="_blank">http://github.com/dov/paps</a>>) from my own > postscript generation to using cairo. One of the things I wonder is how > to insert tumble and duplex instructions in the generated postscript. > The postscript for duplex and tumple typically look as follows: > > statusdict /setduplexmode known > { statusdict begin setduplexmode end } {pop} ifelse > statusdict /settumble known > { statusdict begin settumble end } {pop} ifelse > > I suppose that I could add these statements through > > cairo_ps_surface_dsc_comment() > > but this looks quite ugly, as these statements are not dsc comments. So > is there another method? The DSC comment functions are used for selecting printer features. eg cairo_ps_surface_dsc_comment(surface, "%%IncludeFeature: *Duplex DuplexNoTumble"); CUPS will replace this with the PostScript code to enable duplex extracted from the printer PPD. An example of enabling duplex can be seen in the pdftocairo code: <a href="http://cgit.freedesktop.org/poppler/poppler/tree/utils/pdftocairo.cc" rel="noreferrer" target="_blank">http://cgit.freedesktop.org/poppler/poppler/tree/utils/pdftocairo.cc</a> > > Regards, > Dov > > > </blockquote></div> </div></div>