PixbufModulePreparedFunc   
    Defines the type of the function that gets called once the initial setup of @pixbuf is done.
#GdkPixbufLoader uses a function of this type to emit the "area_prepared" signal.
- param - pixbufthe #GdkPixbuf that is currently being loaded.
- param - animif an animation is being loaded, the #GdkPixbufAnimation, else null.