fn main() {
    let mut pixels: Vec<u8> = vec![0; 4 * 1920 * 1080];
    let surface = unsafe {
        let ptr = cairo_sys::cairo_image_surface_create_for_data(
            pixels.as_mut_ptr(),
            cairo_sys::FORMAT_A_RGB32,
            1280,
            720,
            4 * 1920,
        );

        cairo::ImageSurface::from_raw_full(ptr).unwrap()
    };

    let cr = cairo::Context::new(&surface);
    cr.set_antialias(cairo::Antialias::Best);
    cr.set_source_rgba(1.0, 0.0, 0.0, 1.0);
    cr.rectangle(100.0, 100.0, 640.0, 360.0);
    cr.fill();

    let mut file = std::fs::File::create("sample.png").unwrap();
    surface.write_to_png(&mut file).unwrap();
}