[cairo] Inserting duplex and tumble options in cairo postscript output

[Adrian Johnson]

On 19/08/15 22:41, Dov Grobgeld wrote:
> I have recently ported my line printing program paps
> (http;//github.com/dov/paps <http://github.com/dov/paps>) 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:

http://cgit.freedesktop.org/poppler/poppler/tree/utils/pdftocairo.cc


> 
> Regards,
> Dov
> 
> 
>