Function drmtap_diff_frames 

pub unsafe extern "C" fn drmtap_diff_frames(
    frame_a: *const c_void,
    frame_b: *const c_void,
    width: u32,
    height: u32,
    stride: u32,
    rects_out: *mut drmtap_rect,
    max_rects: c_int,
    tile_size: c_int,
) -> c_int