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List:       kde-core-devel
Subject:    Re: kde3 kde4 coinstallability take two
From:       Thiago Macieira <thiago () kde ! org>
Date:       2007-10-22 10:55:00
Message-ID: 200710221255.00398.thiago () kde ! org
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Em Monday 22 October 2007 12:20:00 Kurt Pfeifle escreveu:
> Thiago Macieira wrote:
> > kprinter -- as a command-line tool that prints PostScript input and shows
> > a print dialog
>
> You don't seem to know kprinter too well. Yes, kprinter shows the print
> dialog. But no, it isn't confined to PostScript input...
>
> > should be replaced with a full-fledged PostScript reader.
>
> ...and therefore, above recommonendation isn't quite spot on.
>
> kprinter can send *any* file to the print sub-system. If that is CUPS,
> sending PDF, any image format (like GIF, TIFF, PNG, JPEG, PPM, PNM, Sun
> Raster,...) is useful, because CUPS can auto-convert it to whatever the
> target printer needs.

Ok, rephrasing:

it should be replaced with a full-fledged document viewer, like Okular. Can't 
Okular read GIF, TIFF, PNG, etc. ?

In any case, CUPS isn't the only backend we support. Therefore, we cannot rely 
on CUPS features, like accepting those formats. We need an application that 
understands the file format and converts to the printing system's printing 
language (no, that does not mean PostScript -- the application may have to 
read PostScript and output something else).

> > In any case, it's not a runtime issue: KDE applications shouldn't be
> > calling kprinter, they should use the C++ classes. Are there any cases of
> > KDE applications using this? (These are, by definition, non-GUI
> > applications and KDE isn't in the business of writing them!)
>
> There are cases were *non*-KDE apps, running inside a KDE environment,
> use kprinter as the print dialog (Mozilla, Netscape, Firefox, Thunder-
> bird, OpenOffice, StarOffice, Acrobat Reader....).

That is not a KDE3-vs-KDE4 co-installability issue. You can still use KDE 3's 
kprinter, since KDE 4 isn't overwriting it.

-- 
  Thiago Macieira  -  thiago (AT) macieira.info - thiago (AT) kde.org
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