copy_area/[8,9]

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

Copy 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.