On Wed, 15 Apr 2009 07:02:07 +0530 Vamsi Krishna Davuluri <vamsi.davul...@gmail.com> wrote:
> > hello, > > I am a gsoc applicant for sugar, and doing a project which adds print > support to our applications. > The idea is to convert our mime types to a more printable format and > print them. > So, now the question is how does convertion to ps/pdf take place with > gtkprint > I would like to know if it is true that gtkprint uses a common filter > for converting to pdf/ps for any application? > or will it again interact with different respective filters? At the library user level, gtk-print doesn't convert to ps or pdf in order to print. It uses cairo/pango-cairo to write each page to a cairo context. It becomes clearer if you look at the documentation for GtkPrintOperation (including the "draw-page" signal) and GtkPrintContext. After the drawing of the document with cairo has been completed, gtk-print will convert those pages to postscript where unix (cups or lpr) rather than windows is the underlying print system, but that is not for the user to do nor bother with. Since you refer to sugar, you may be doing this in python. The py-gtk documentation is generally pretty good (better in some respects than the C interface documentation) so look at gtk.PrintOperation and gtk.PrintContext etc., which covers the same ground with some mini-examples. As it happens, if you are only interested in running your programs under unix-like operating systems, you can print a pre-prepared postscript document using GtkPrintUnixDialog and GtkPrintJob with the gtk_print_job_set_source_file() function, but doing that would offer less features. You could not for example select the pages to be printed, nor scale it nor set the margins, and it is not really the best way to do it. So it is best to stick to the high level GtkPrintOperation/cairo interface in order to give users what they expect. Chris _______________________________________________ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
