[cups.development] How/where can I obtain a filter for cupsto produce PWG raster file?

[Michael Sweet]

On Mar 22, 2011, at 8:09 PM, Roy Samuel wrote:
> Thanks Michael for the reply :) My goal is to produce a PWG raster file first, and then to write code which would decode the PWG raster file to plain RGB (uncompressed). I understand that ‘Google cloud print’ has chosen PWG raster as their PDL, and printers would come with support for PWG raster baked in.
> --1--  Is the code for decoding PWG raster file to RGB data already existing in the public domain? If so, would you direct me to it?

There is no "public domain" code that I am aware of.  The CUPS code is provided under the terms of the LGPL2.

> --2--  Also, is there a location where I can download a sample PWG raster file?

Not that I am aware of. Ghostscript, cgpdftoraster (Mac OS X), and the imagetoraster filter included with CUPS are all capable of generating CUPS Raster, from which you can derive PWG Raster (which is big-endian CUPS Raster).

>  
> I’m heading to compile & build the svn version of cups 1.5, with the code modifications you have pointed out.
>  
> Thanks & Regards,
> -Roy.
>  
>  
> From: Michael Sweet [mailto:msweet at apple.com] 
> Sent: Tuesday, March 22, 2011 10:08 PM
> To: Mirror of cups.development Newsgroup
> Subject: Re: [cups.development] How/where can I obtain a filter for cupsto produce PWG raster file?
>  
> [Background for those reading along: PWG Raster is a subset of CUPS Raster that is big-endian word order]
>  
> On Mar 22, 2011, at 3:29 AM, Roy Samuel wrote:
> Hi,
> I have installed the latest stable version of cups, 1.4.6 on my Ubuntu (10.10) machine.
>  
> I would like to be able to produce a PWG raster file written on to disk. Is the PWG raster a filter that cups would be using? If so, where can I get to use it?
>  
> CUPS 1.4.x does not support writing of PWG Raster data. Support was added in CUPS 1.5.x and can be chosen by using the CUPS_RASTER_WRITE_PWG value when calling cupsRasterOpen.
>  
> CUPS 1.2.x and later support reading of PWG Raster data and will automatically handle any byte swapping that is needed.
>  
> Would you guide me in how this can be done? Also, if you can send me a sample PWG raster file (link to it), it would be of great help.
> Any help would be appreciated. Perhaps some links to relevant information?
>  
> For the current 1.5.x snapshot:
>  
>     http://www.cups.org/software.php
>  
> For the current PWG Raster specification:
>  
>     http://www.pwg.org/ipp
>  
> ________________________________________________________________________
> Michael Sweet, Senior Printing System Engineer, PWG Chair
>  
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__________________________________________________
Michael Sweet, Senior Printing System Engineer, PWG Chair

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