Move ColorShift traits into the main repo.

OpenRA.Mods.Common/Traits/Palettes/FixedColorShift.cs

@@ -0,0 +1,66 @@
+#region Copyright & License Information
+/*
+ * Copyright (c) The OpenRA Developers and Contributors
+ * 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, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using OpenRA.Graphics;
+using OpenRA.Primitives;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Mobius.Traits
+{
+	[TraitLocation(SystemActors.World | SystemActors.EditorWorld)]
+	[Desc("Apply a fixed color shift to a palette. Use this to add RGBA compatibility to FixedColorPalette.")]
+	public class FixedColorShiftInfo : TraitInfo
+	{
+		[PaletteReference]
+		[FieldLoader.Require]
+		[Desc("The name of the palette to base off.")]
+		public readonly string BasePalette = null;
+
+		[Desc("The fixed color to remap.")]
+		public readonly Color Color;
+
+		[Desc("Hues between this and MaxHue will be shifted.")]
+		public readonly float MinHue = 0.29f;
+
+		[Desc("Hues between MinHue and this will be shifted.")]
+		public readonly float MaxHue = 0.37f;
+
+		[Desc("Hue reference for the color shift.")]
+		public readonly float ReferenceHue = 0.33f;
+
+		[Desc("Saturation reference for the color shift.")]
+		public readonly float ReferenceSaturation = 0.925f;
+
+		[Desc("Value reference for the color shift.")]
+		public readonly float ReferenceValue = 0.95f;
+
+		public override object Create(ActorInitializer init) { return new FixedColorShift(this); }
+	}
+
+	public class FixedColorShift : ILoadsPalettes
+	{
+		readonly FixedColorShiftInfo info;
+
+		public FixedColorShift(FixedColorShiftInfo info)
+		{
+			this.info = info;
+		}
+
+		public void LoadPalettes(WorldRenderer wr)
+		{
+			var (r, g, b) = info.Color.ToLinear();
+			var (h, s, v) = Color.RgbToHsv(r, g, b);
+			wr.SetPaletteColorShift(info.BasePalette,
+				h - info.ReferenceHue, s - info.ReferenceSaturation, v / info.ReferenceValue,
+				info.MinHue, info.MaxHue);
+		}
+	}
+}