pub unsafe extern "C" fn im_tbmerge1(
ref_: *mut VipsImage,
sec: *mut VipsImage,
out: *mut VipsImage,
xr1: c_int,
yr1: c_int,
xs1: c_int,
ys1: c_int,
xr2: c_int,
yr2: c_int,
xs2: c_int,
ys2: c_int,
mwidth: c_int,
) -> c_int