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This is a major refactoring of the source code. Amongst others, the
classes TumblerProviderFactory, TumblerThumbnailer,
TumblerAbstractThumbnailer, TumblerThumbnailerProvider, TumblerCache,
TumblerCacheProvider and TumblerFileInfo have been added.
From now on tumbler supports different storage backends and thumbnailers
as plugins. Storage backends have to implement TumblerCache,
thumbnailers have to implement TumblerThumbnailer.
Plugins have to implement three methods: tumbler_plugin_initialize(),
tumbler_plugin_shutdown() and tumbler_plugin_get_types(). The latter
is expected to return a list of provider types for cache or thumbnailer
implementations.
Two example plugins have been added, one for the XDG thumbnail cache
and one for a GdkPixbuf based thumbnailer.
The code of tumblerd was updated to reflect these changes in libtumbler.
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