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Re: Custom RIP and Backend

Abhijit,

It sounds like your custom RIP is a PostScript RIP that converts PS to PCL3. Instead of sending PS jobs to your RIP via a CUPS backend (as shown in your diagram) it would be more efficient to implement your RIP as a CUPS filter, reading the PS stream on stdin. So the print chain would be

App --> PDF spool file --> cgpdftops --> pstops --> yourRIP --> backend --> printer

or for apps that generate their own PS

App --> PICTwPS spool file --> pictwpstops -->pstops --> yourRIP --> backend --> printer

Then, hopefully, you will be able to use the standard backends (lpd, pap, socket, usb, etc.). Or else write a custom backend if your printer does not support any of the standard protocols. Another thing you will need to do is specify your filter in your PPD file(s).

On the other hand, if you don't want to change your custom RIP to use stdin, then your diagram is still valid. Maybe your RIP has an lpd front-end, or a pap server. In that scenario, you will have to do your own IO to your printer.

Regarding Open Transport, note that it has limited support on X, as documented here ...

<http://developer.apple.com/techpubs/macosx/Essentials/SystemOverview/ SystemArchitecture/chapter_3_section_25.html>

-Paul


On Sunday, February 16, 2003, at 09:57 PM, Abhijit Gupta wrote:

Hi ,
I am investing how my Custom RIP will fit into Mac OS X printing
architecture.
I think following will be the flow of data from application to
printer.

(PS input to RIP) (PCL3GUI output from RIPS)
Application -------------> cgpdftops -------->pstops --------My custom
cups backend ----->RIP---->CUPS Backend/ Backend with Open Transport
--->Printer.

I am not sure whether I can use CUPS backend to pass my PCL3GUI data to
printer from my RIP or
should I use Open Transport to develop the backend ?
Any pointers ?

Thanks & Best Regards,
Abhijit
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References: 
 >Custom RIP and Backend (From: Abhijit Gupta <email@hidden>)



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