Function TCOD_image_blit_2x 

pub unsafe extern "C" fn TCOD_image_blit_2x(
    image: TCOD_image_t,
    dest: TCOD_console_t,
    dx: c_int,
    dy: c_int,
    sx: c_int,
    sy: c_int,
    w: c_int,
    h: c_int,
)