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This commit adds the TUMBLER_ERROR_DOMAIN and TUMBLER_ERROR defines and
a TumblerErrorEnum with currently only containing TUMBLER_ERROR_FAILED.
Also new is the TumblerThumbnailFlavor enum type, together with a few
utility functions related to creating thumbnails:
- tumbler_thumbnail_get_flavors() returns all flavors supported by
the current build of tumbler,
- tumbler_thumbnail_flavor_get_size() returns the size corresponding
to a flavor (e.g. 128 for TUMBLER_THUMBNAIL_FLAVOR_NORMAL),
- tumbler_thumbnail_flavor_get_directory() returns a GFile pointing
to the flavor directory (e.g. $HOME/.thumbnails/normal/ for
TUMBLER_THUMBNAIL_FLAVOR_NORMAL),
- tumbler_thumbnail_get_file() returns a GFile pointing to the
thumbnail destination file of an URI and a flavor,
- tumbler_thumbnail_create_and_open_file() tries to create such a
GFile and also tries to open it for writing, returning the
GFileOutputStream if possible.
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