Re: The Common Printing Dialog and PDF as standard print job format for GTK/GNOME applications

[Ghee Teo <Ghee Teo Sun COM>]

Hi Till,

Thanks for raising this here. In reference [6] you mentioned, the 
committee suggested to transfer the
print dialog out of the toolkit (in this context, it is GTK+) and you 
also mentioned access to the new
dialog by plug-in interface, can you elaborate on this?
How can an application passes its data between the dialog and vice 
versa? Since setting on the dialog
has implication on how the application to render the pages and also 
interaction to the print system.
This we need to think also in the context that GTK+ is cross-platform, 
not only on Linux/OpenSolaris
and also Windows.

I would like to help out to see a newer rev of Print Dialog base on 
Peter Sikking's design be available on
GNOME, the work does seems to be non-trivial not only on the GUI 
elements, but also in API abstraction
if we are to continue to use the current GTK+ front-end and back-end 
print systems approach.
Would some GTK+ hackers have comments on this?


-Ghee
P.S. Would you or any of the GSOC going to GAUDEC 2008 in Istabul in 
July 7th-12th?
I have a BOF on 
http://guadec.expectnation.com/guadec08/public/schedule/detail/15
We could have more discussion after that in Print Dialog :)

Till Kamppeter wrote:
> Hi,
>
> at OpenPrinting [0] we have developed several new technologies for
> making printing more reliable and much easier for the user. Currently,
> we have 5 Google Summer of Code students and so we get a lot of our
> ideas implemented. Two of our projects need changes in graphical
> applications and/or the GUI toolkit libraries, as for example GTK. One 
> is the Common Printing Dialog and the other is the use of PDF as the
> standard print job format. Both features have found a wide acceptance on
> the Printing Summits [10] and implementation has started now. especially
> with a lot of support from the printer manufactures for the PDF printing
> workflow.
>
>
> Common Printing Dialog
> ----------------------
>
> As most of you already know, OpenPrinting and OpenUsability have
> developed a Common Printing Dialog for all desktops and applications
> [1], [2], [3]. Ubuntu blueprint at [9]. This should make printing much
> easier as if they get used how to print with application A they
> immediately know how to print from application B. It will also get
> assured that there is always access to all functionality of the printer
> (driver) and the printing system, requiring no effort from application
> developers. We would like to have the support from GTK and GNOME to make
> applications interfacing to the new dialog by a plug-in interface. This
> will not only allow to use our dialog as the common one but also any
> other one, as the ones from Qt or GTK for example.
>
> The interface is designed and implemented by Lars Uebernickel, one of
> the Google Summer of Code students [7]. The specs for this interface are
> work in progress on [4]. Requirements are written up on [5]. This
> interface needs also to be implemented in the applications and/or their
> common GUI libraries, in our case GTK. Lars will work on patching the
> libraries, but these patches should not only go into packages of Linux
> distributions but also into the upstream software repositories. So I ask
> you for working together with Lars to make these patches also part of
> the upstream code.
>
> Patches should only be used as a backport of a feature from a future
> software version to the software in the current version of a
> distribution (in the case the software currently under development will
> not make it into the next releases of the distros.
>
>
> PDF as the Standard Print Job Format
> ------------------------------------
>
> To improve the reliability of the printing process, especially for
> complex graphics, high color depths, and for jobs where pages get
> separated and reordered (2 pages per sheet, booklets, selected pages,
> ...) we are switching from PostScript to PDF as standard print job format.
>
> The server (printing system) side is nearly completely implemented in
> the form of new CUPS filters and file conversion rules.
>
> On the client (application) side it is needed that the applications
> generate the print jobs in PDF and not in Postscript. This would mean a
> change of the application and/or GUI library code, probably only the
> latter (at least for GTK applications). This is not absolutely urgent, 
> as CUPS can convert PostScript to PDF with a pstopdf filter, but
> applications which directly produce PDF have a better control over the
> graphical quality of the print job, and they even solve page management
> (2 on a sheet, booklets, selected pages, ...) problems on old
> PostScript-based servers, as a CUPS filter will generate PostScript from
> the incoming PDF then (pdftops) and this PostScript is much cleaner as
> the one coming from most applications.
>
> So I am asking you whether you can change the GTK library to make the
> "Print" command in GTK-based applications emitting PDF instead of
> PostScript. To not break lagacy, non-PDF-capable environments, make this
> a configurable option. If you have already doe so, please tell how to
> configure the GTK library to output PDF, so that we will make this
> configuration setting the default in all Linux distribution.
>
>
> I am very grateful for any support from the GTK and GNOME side in terms 
> of these OpenPrinting projects. They will improve the printing workflow 
> a lot and will make many bugs and user complaints go away.
>
>     Till
>
>
> [0]http://www.openprinting.org/
> [1]http://www.mmiworks.net/eng/publications/labels/openPrinting.html
> [2]http://wiki.openusability.org/printing/
> [3]http://wiki.openusability.org/printing/index.php/Specification
> [4]http://www.linux-foundation.org/en/OpenPrinting/Specifications
> [5]http://www.linux-foundation.org/en/OpenPrinting/Requirements
> [6]http://portland.freedesktop.org/wiki/PrintDialog
> [7]http://code.google.com/soc/2008/linux/appinfo.html?csaid=53E53CD78F134BE9
> [8]http://code.google.com/soc/2008/linux/appinfo.html?csaid=9D65D29842F34550
> [9]https://blueprints.launchpad.net/ubuntu/+spec/applications-printing
> [10]https://www.linux-foundation.org/en/OpenPrinting/MeetingInfo
> [11]https://blueprints.launchpad.net/ubuntu/+spec/pdf-as-standard-print-job-format
>
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