using System;

namespace AForge.Imaging;

public class YCbCr
{
	public const short YIndex = 0;

	public const short CbIndex = 1;

	public const short CrIndex = 2;

	public float Y;

	public float Cb;

	public float Cr;

	public YCbCr()
	{
	}

	public YCbCr(float y, float cb, float cr)
	{
		Y = System.Math.Max(0f, System.Math.Min(1f, y));
		Cb = System.Math.Max(-0.5f, System.Math.Min(0.5f, cb));
		Cr = System.Math.Max(-0.5f, System.Math.Min(0.5f, cr));
	}

	public static void FromRGB(RGB rgb, YCbCr ycbcr)
	{
		float num = (float)(int)rgb.Red / 255f;
		float num2 = (float)(int)rgb.Green / 255f;
		float num3 = (float)(int)rgb.Blue / 255f;
		ycbcr.Y = (float)(0.2989 * (double)num + 0.5866 * (double)num2 + 0.1145 * (double)num3);
		ycbcr.Cb = (float)(-0.1687 * (double)num - 0.3313 * (double)num2 + 0.5 * (double)num3);
		ycbcr.Cr = (float)(0.5 * (double)num - 0.4184 * (double)num2 - 0.0816 * (double)num3);
	}

	public static YCbCr FromRGB(RGB rgb)
	{
		YCbCr yCbCr = new YCbCr();
		FromRGB(rgb, yCbCr);
		return yCbCr;
	}

	public static void ToRGB(YCbCr ycbcr, RGB rgb)
	{
		float num = System.Math.Max(0f, System.Math.Min(1f, (float)((double)ycbcr.Y + 0.0 * (double)ycbcr.Cb + 1.4022 * (double)ycbcr.Cr)));
		float num2 = System.Math.Max(0f, System.Math.Min(1f, (float)((double)ycbcr.Y - 0.3456 * (double)ycbcr.Cb - 0.7145 * (double)ycbcr.Cr)));
		float num3 = System.Math.Max(0f, System.Math.Min(1f, (float)((double)ycbcr.Y + 1.771 * (double)ycbcr.Cb + 0.0 * (double)ycbcr.Cr)));
		rgb.Red = (byte)(num * 255f);
		rgb.Green = (byte)(num2 * 255f);
		rgb.Blue = (byte)(num3 * 255f);
		rgb.Alpha = byte.MaxValue;
	}

	public RGB ToRGB()
	{
		RGB rGB = new RGB();
		ToRGB(this, rGB);
		return rGB;
	}
}