PixbufModuleUpdatedFunc   
    typealias PixbufModuleUpdatedFunc = (pixbuf: Pixbuf, <Error class: unknown class>, <Error class: unknown class>, <Error class: unknown class>, <Error class: unknown class>) -> Unit(source)
Defines the type of the function that gets called every time a region of @pixbuf is updated.
#GdkPixbufLoader uses a function of this type to emit the "area_updated" signal.
- param - pixbufthe #GdkPixbuf that is currently being loaded.
- param - xthe X origin of the updated area.
- param - ythe Y origin of the updated area.
- param - widththe width of the updated area.
- param - heightthe height of the updated area.