[Tracker] Thumbnails?

I am trying to build a photo management application that will use
Tracker instead of its own SQLite DB.

Is there any way Tracker can help me get the thumbnails for a
particular photo known to Tracker? I found
and noticed that tracker-thumbnailer.c mentions
org.freedesktop.thumbnailer (and friends), but I do not think I have
any program on my GNOME desktop which actually provides this service.
Is Maemo's hildon-thumbnail what I should be looking for?

I know that gnome-desktop provides a GnomeDesktopThumbnailFactory but
it does not seem have any asynchronous API and I would like to avoid
having to deal with threads just for fetching thumbnails as is being
done by Eye of GNOME. Not sure how damaging it would be to use the
synchronous calls to lookup, and if create and save thumbnails in the
main thread, either.

Any help or pointers would be appreaciated.

One reason that life is complex is that it has a real part and an
imaginary part.
    -- Andrew Koenig

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