using System.Drawing;

namespace OpenRa.Graphics
{
	public class Sprite
	{
		public readonly Rectangle bounds;
		public readonly Sheet sheet;
		public readonly TextureChannel channel;
		public readonly RectangleF uv;
		public readonly float2 size;

		readonly float2[] uvhax;

		internal Sprite(Sheet sheet, Rectangle bounds, TextureChannel channel)
		{
			this.bounds = bounds;
			this.sheet = sheet;
			this.channel = channel;

			uv = new RectangleF(
					(float)(bounds.Left + .5f) / sheet.Size.Width,
					(float)(bounds.Top + .5f) / sheet.Size.Height,
					(float)(bounds.Width - .5f) / sheet.Size.Width,
					(float)(bounds.Height - .5f) / sheet.Size.Height);

			uvhax = new float2[]
			{
				new float2( uv.Left, uv.Top ),
				new float2( uv.Right, uv.Top ),
				new float2( uv.Left, uv.Bottom ),
				new float2( uv.Right, uv.Bottom ),
			};

			this.size = new float2(bounds.Size);
		}

		public float2 FastMapTextureCoords( int k )
		{
			return uvhax[ k ];
		}
	}

	public enum TextureChannel
	{
		Red = 0,
		Green = 1,
		Blue = 2,
		Alpha = 3,
	}
}