Method Main

imagequant-sys/libimagequant.cs:123–162

(string[] args)

        public static extern int liq_version();

        static void Main(string[] args)
        {
            Console.WriteLine("library version: {0}", liq_version());

            int width = 3;
            int height = 1;

            var attr = liq_attr_create();
            if (attr == IntPtr.Zero) throw new Exception("can't create attr");

            byte[] bitmap = { // R, G, B, A,  R, G, B, A, ...
                111, 222, 33, 255,
                255, 0, 255, 255,
                255, 0, 255, 255,
            };
            var img = liq_image_create_rgba(attr, bitmap, width, height, 0);
            if (img == IntPtr.Zero) throw new Exception("can't create image");

            var res = liq_quantize_image(attr, img);
            if (res == IntPtr.Zero) throw new Exception("can't quantize image");

            var buffer_size = width * height;
            var remapped = new byte[buffer_size];

            var err = liq_write_remapped_image(res, img, remapped, (UIntPtr)buffer_size);
            if (err != liq_error.LIQ_OK)
            {
                throw new Exception("remapping error");
            }

            Console.WriteLine("first pixel is {0}th palette entry", remapped[0]);

            liq_palette pal = (liq_palette)Marshal.PtrToStructure(liq_get_palette(res), typeof(liq_palette));

            Console.WriteLine("palette entries: {0}; red of first entry: {1}", pal.count, pal.entries[0].r);

            liq_image_destroy(img);
            liq_result_destroy(res);
            liq_attr_destroy(attr);
        }
    }
}