copy_plane/[9,10]

     copy_plane(+Dst, +Dst_x, +Dst_y, +Src, +Src_x, +Src_y,
                +Width, +Height, +Plane)
     copy_plane(+Dst, +Src, +Gc, +Dst_x, +Dst_y, +Src_x, +Src_y,
                +Width, +Height, +Plane)
     

Copy some bit planes from a region of Src into Dst. Src_x, Src_y, Width, and Height define the part of Src that is to be copied, and Dst_x and Dst_y specify where in Dst the are is to be copied. Plane is a bit mask (i.e. an integer) specifying which planes to copy.