using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Chrosey.Extensions
{
    public static class ImageExtensions
    {

        /// <summary>
        /// Gibt eine Liste an Farben zurück, die für ein Quantisierungsverfahren geeignet sind.
        /// </summary>
        /// <param name="bitmap"></param>
        /// <returns></returns>
        public static List<Color> Pixels(this Bitmap bitmap, int quality)
        {
            
            var pixels = new List<Color>();
            var count = 0;
            for (int x = 0; x < bitmap.Width; x++)
            {
                for (int y = 0; y < bitmap.Height; y++)
                {
                    if (count % quality == 0)
                    {
                        count = 0;
                        var p = bitmap.GetPixel(x, y);
                        if (p.A >= 125)
                        {
                            if (!(p.R > 250 && p.G > 250 && p.B > 250))
                            {
                                pixels.Add(p.SignificantColor());
                            }
                        }
                    }

                    count++;
                }
            }
            return pixels;
        }
    }
}