Creates a new animation by loading it from an input stream.
The file format is detected automatically.
If NULL is returned, then @error will be set.
The @cancellable can be used to abort the operation from another thread.
If the operation was cancelled, the error G_IO_ERROR_CANCELLED will be
returned. Other possible errors are in the GDK_PIXBUF_ERROR and
G_IO_ERROR domains.
Creates a new animation by loading it from an input stream.
The file format is detected automatically.
If NULL is returned, then @error will be set.
The @cancellable can be used to abort the operation from another thread. If the operation was cancelled, the error G_IO_ERROR_CANCELLED will be returned. Other possible errors are in the GDK_PIXBUF_ERROR and G_IO_ERROR domains.
The stream is not closed.