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EPhotoSource is an interface used to extend the functionality of
EPhotoCache.  You can add an object implementing EPhotoSource to an
EPhotoCache with e_photo_cache_add_photo_source() and remove it with
e_photo_cache_remove_photo_source().  When EPhotoCache needs a photo
for an email address it will invoke e_photo_source_get_photo() on all
available EPhotoSource objects simultaneously and select one photo.
void e_photo_source_get_photo (EPhotoSource *photo_source,const gchar *email_address,GCancellable *cancellable,GAsyncReadyCallback callback,gpointer user_data);
Asynchronously searches for a photo for email_address
.
When the operation is finished, callback
 will be called.  You can then
call e_photo_source_get_photo_finish() to get the result of the operation.
| photo_source | an EPhotoSource | |
| email_address | an email address | |
| cancellable | optional GCancellable object, or  | |
| callback | a GAsyncReadyCallback to call when the request is satisfied | |
| user_data | data to pass to the callback function | 
gboolean e_photo_source_get_photo_finish (EPhotoSource *photo_source,GAsyncResult *result,GInputStream **out_stream,gint *out_priority,GError **error);
Finishes the operation started with e_photo_source_get_photo().
If a match was found, a GInputStream from which to read image data is
returned through the out_stream
 return location, and a suggested priority
value for the match is returned through the out_priority
 return location.
You can use the out_priority
 value to rank this result among other
EPhotoSource results.  The value is usually G_PRIORITY_DEFAULT
, but
may be G_PRIORITY_LOW
 if the result is a fallback image.
If no match was found, the out_stream
 return location is set to NULL
(the out_priority
 return location will remain unset).
The return value indicates whether the search completed successfully,
not whether a match was found.  If an error occurred, the function will
set error
 and return FALSE.
| photo_source | an EPhotoSource | |
| result | a GAsyncResult | |
| out_stream | return location for a GInputStream | |
| out_priority | return location for a priority value, or  | |
| error | return location for a GError, or  |