Split HSLColor out from ColorRamp.

OpenRA.FileFormats/HSLColor.cs

@@ -0,0 +1,99 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2011 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using System.Drawing;
+
+namespace OpenRA.FileFormats
+{
+	public struct HSLColor
+	{
+		public readonly byte H;
+		public readonly byte S;
+		public readonly byte L;
+
+		public HSLColor(byte h, byte s, byte l)
+		{
+			H = h;
+			S = s;
+			L = l;
+		}
+
+		public Color ToColor()
+		{
+			return RGBFromHSL(H / 255f, S / 255f, L / 255f);
+		}
+
+		public void ToHSV(out float h, out float s, out float v)
+		{
+			var ll = 2*L / 255f;
+			var ss = S / 255f * ((ll <= 1) ? ll : 2 - ll);
+
+			h = H / 255f;
+			s = (2 * ss) / (ll + ss);
+			v = (ll + ss) / 2;
+		}
+
+		public static HSLColor FromHSV(float h, float s, float v)
+		{
+			var ll = 0.5f*(2 - s)*v;
+			var ss = (ll >= 1 || v <= 0) ? 0 : 0.5f*s*v / (ll <= 0.5f ? ll : 1 - ll);
+			return new HSLColor((byte)(255*h), (byte)(255*ss), (byte)(255*ll));
+		}
+
+		public static Color RGBFromHSL(float h, float s, float l)
+		{
+			// Convert from HSL to RGB
+			var q = (l < 0.5f) ? l * (1 + s) : l + s - (l * s);
+			var p = 2 * l - q;
+
+			float[] trgb = { h + 1 / 3.0f, h, h - 1/3.0f };
+			float[] rgb = { 0, 0, 0 };
+
+			for (int k = 0; k < 3; k++)
+			{
+				while (trgb[k] < 0) trgb[k] += 1.0f;
+				while (trgb[k] > 1) trgb[k] -= 1.0f;
+			}
+
+			for (int k = 0; k < 3; k++)
+			{
+				if (trgb[k] < 1 / 6.0f) { rgb[k] = (p + ((q - p) * 6 * trgb[k])); }
+				else if (trgb[k] >= 1 / 6.0f && trgb[k] < 0.5) { rgb[k] = q; }
+				else if (trgb[k] >= 0.5f && trgb[k] < 2.0f / 3) { rgb[k] = (p + ((q - p) * 6 * (2.0f / 3 - trgb[k]))); }
+				else { rgb[k] = p; }
+			}
+
+			return Color.FromArgb((int)(rgb[0] * 255), (int)(rgb[1] * 255), (int)(rgb[2] * 255));
+		}
+
+		public override string ToString()
+		{
+			return "{0},{1},{2}".F(H, S, L);
+		}
+
+		public static bool operator ==(HSLColor me, HSLColor other)
+		{
+			return (me.H == other.H && me.S == other.S && me.L == other.L);
+		}
+
+		public static bool operator !=(HSLColor me, HSLColor other) { return !(me == other); }
+
+		public override int GetHashCode() { return H.GetHashCode() ^ S.GetHashCode() ^ L.GetHashCode(); }
+
+		public override bool Equals(object obj)
+		{
+			if (obj == null)
+				return false;
+
+			HSLColor o = (HSLColor)obj;
+			return o == this;
+		}
+	}
+}