Re: [Tracker] fd.o compliant thumbnailing

["Edward Duffy" <eduffy gmail com>]

shouldn't be hard at all.  is there a location where all the keys are
documented?

On 1/8/07, Erlend Davidson <E R M Davidson sms ed ac uk> wrote:
> Jamie McCracken wrote:
> > Erlend Davidson wrote:
> >>
> >> Jamie McCracken wrote:
> >>> Erlend Davidson wrote:
> >>>
> >>>> That would require a whole standard for thumbnailers... the thunar
> >>>> ones take three or four command-line arguments (input file, size,
> >>>> output file and optionally the URI of the file), this should be
> >>>> sufficient, but someone might want more and then the standard would
> >>>> break.
> >>> not really the same arguments are used by gnome in its gconf based
> >>> thumbnailers so its already a de facto standard. (A;though I dont
> >>> know what KDE uses?)
> >> KDE is slightly different I think.  For example with kwebdesktop
> >> (which is used to thumbnail webpages),
> >>
> >> kwebdesktop 640 480 output_file input_file.
> >>
> >>
> >> This is not an impossible problem to overcome however, as the thunar
> >> way of calling external thumbnailers involves the use of a .desktop
> >> file, like:
> >>
> >> ---< html-thumbnailer.desktop >---
> >> [Desktop Entry]
> >> Version=1.0
> >> Encoding=UTF-8
> >> Type=X-Thumbnailer
> >> TryExec=kwebdesktop
> >> MimeType=text/html;
> >> Name=HTML Thumbnailer
> >> X-Thumbnailer-Exec=kwebdesktop 640 480 %o %u
> >>
> >>
> >> which can be used to change the order of arguments.
> >>>> Incidently tracker uses the same command-line arguments as thunar
> >>>> for thumbnailers.  Coud you possibly change tracker to use the same
> >>>> directory as thunar?
> >>> thats my point - the only thing not standardised is the location of
> >>> the scripts and thats why a freedesktop specified location would be
> >>> preferred by tracker.
> >> I might e-mail the xdg list.
> >>> In the short term, I can of course check for gnome thumbs using
> >>> GConfTool (which does not require linking in GConf) and as you say
> >>> the thunar directory if it exists so patches welcome for that.
> >>>
> >>> feel free to add a bugzilla enhancement request
> >>> (http://bugzilla.gnome.org) to tracker and I will get round to it
> >>> eventually if no patch is forthcoming
> >> What area of the source should I look in to?
> >
> > src/trackerd/tracker-metadata.c
> >
> > function tracker_metadata_get_thumbnail
> Actually it's src/tracker-thumbnailer/tracker-thumbnailer.c
> just after the comment:
> /* do we have a thumbnailer for this mime type? */
>
> Is there an easy way to process .desktop files?  What needs to be done
> is all .desktop files in /usr/local/share/thumbnailers/ read and only
> those with "MimeType=argv[2]" selected.  Then read
> TryExec=DEPEND_ON_THIS_BINARY and check that DEPEND_ON_THIS_BINARY is
> executable and on the path, if so run the command specified by the key
> X-Thumbnailer-Exec.
> e.g.  convert "ps:$ifile[0]" -scale "$sizex$size" "png:$ofile"
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