pub unsafe extern "C" fn pixFindColorRegions(
    pixs: *mut Pix,
    pixm: *mut Pix,
    factor: i32,
    lightthresh: i32,
    darkthresh: i32,
    mindiff: i32,
    colordiff: i32,
    edgefract: f32,
    pcolorfract: *mut f32,
    pcolormask1: *mut *mut Pix,
    pcolormask2: *mut *mut Pix,
    pixadb: *mut Pixa
) -> i32