using System;
using System.Collections;
using System.Collections.Generic;
using System.Globalization;
using System.Text;
using System.Drawing;

namespace CodeImp.DoomBuilder.Rendering
{
	public struct PixelColor
	{
		#region ================== Variables

		// Members
		public byte b;
		public byte g;
		public byte r;
		public byte a;

		#endregion

		#region ================== Constructors

		// Constructor
		public PixelColor(byte a, byte r, byte g, byte b)
		{
			// Initialize
			this.a = a;
			this.r = r;
			this.g = g;
			this.b = b;
		}

		// Constructor
		public PixelColor(PixelColor p, byte a)
		{
			// Initialize
			this.a = a;
			this.r = p.r;
			this.g = p.g;
			this.b = p.b;
		}

		#endregion

		#region ================== Static Methods

		// Construct from color
		public static PixelColor FromColor(Color c)
		{
			return new PixelColor(c.A, c.R, c.G, c.B);
		}

		// Construct from int
		public static PixelColor FromInt(int c)
		{
			return FromColor(Color.FromArgb(c));
		}

		#endregion

		#region ================== Methods

		// This blends two colors with respect to alpha
		public PixelColor Blend(PixelColor a, PixelColor b)
		{
			PixelColor c = new PixelColor();
			float ba;

			ba = (float)a.a * 0.003921568627450980392156862745098f;
			c.r = (byte)((float)a.r * (1f - ba) + (float)b.r * ba);
			c.g = (byte)((float)a.g * (1f - ba) + (float)b.g * ba);
			c.b = (byte)((float)a.b * (1f - ba) + (float)b.b * ba);
			c.a = (byte)((float)a.a * (1f - ba) + ba);

			return c;
		}

		#endregion
	}
}