ascii.cs

using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using SixLabors.ImageSharp;
using SixLabors.ImageSharp.PixelFormats;
using SixLabors.ImageSharp.Processing;

namespace reducer
{
    class Program
    {
        static void Main(string[] args)
        {
            using (var rawMap = Image.Load<Rgba32>("C:\\Users\\David Whitney\\OneDrive\\Desktop\\cat.jpg"))
            {
                var asString = ImageTranscoder.Render(rawMap);
                Console.WriteLine(asString);
            }
        }
    }


    public class ImageTranscoder
    {
        private static readonly Dictionary<float, string> Map;


        public static string Render(Image<Rgba32> image)
        {
            image = ResizeAllSmallLike(image);

            var sb = new StringBuilder();

            var pallet = new List<Rgba32>();
            
            for (var y = 0; y < image.Height; y++)
            {
                for (var x = 0; x < image.Width; x++)
                {
                    var pixel = image[x, y];

                    if (!pallet.Contains(pixel))
                    {
                        pallet.Add(pixel);
                    }

                    var index = pallet.IndexOf(pixel);

                    sb.Append(index.ToString().PadLeft(3, '0') + " ");
                }

                sb.Append(Environment.NewLine);
            }

            Console.WriteLine("var pallet = [");
            foreach (var item in pallet)
            {
                Console.WriteLine(item);
            }
            Console.WriteLine("];");

            return PostProcessOutput(sb);
        }

        private static Image<Rgba32> ResizeAllSmallLike(Image<Rgba32> image)
        {
            if (image.Width <= 100 || image.Height <= 100)
            {
                return image;
            }

            var clone = image.Clone(i => i.Resize(10, 10));
            var memoryStream = new MemoryStream();
            clone.SaveAsJpeg(memoryStream);
            memoryStream.Position = 0;
            File.WriteAllBytes("C:\\Users\\David Whitney\\OneDrive\\Desktop\\cat2.jpg", memoryStream.ToArray());
            return clone;
        }


        private static string PostProcessOutput(StringBuilder sb)
        {
            var output = sb.ToString();
            output = output.Replace("000", "   ");
            sb.Clear();
            output = output.Substring(0, output.Length - Environment.NewLine.Length);
            return output;
        }
    }
}