Add error domain, TumblerThumbnailFlavor and thumbnail helper functions.

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.

1 files changed, 7 insertions, 2 deletions

diff --git a/tumbler/Makefile.am b/tumbler/Makefile.am
index fe16a87..21c22cc 100644
--- a/tumbler/Makefile.am
+++ b/tumbler/Makefile.am
@@ -29,11 +29,16 @@ libtumbler_built_sources =						\
 
 libtumbler_headers =							\
 	tumbler-config.h						\
-	tumbler-marshal.h
+	tumbler-enum-types.h						\
+	tumbler-error.h							\
+	tumbler-marshal.h						\
+	tumbler-thumbnail.h
 
 libtumbler_sources =							\
 	tumbler-config.c						\
-	tumbler-marshal.c
+	tumbler-enum-types.c						\
+	tumbler-marshal.c						\
+	tumbler-thumbnail.c
 
 libtumblerincludedir = $(includedir)/tumbler-$(TUMBLER_VERSION_API)/tumbler