Added PaletteFromGrayscale.

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

@@ -0,0 +1,58 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2021 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, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System.Linq;
+using OpenRA.Graphics;
+using OpenRA.Primitives;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[TraitLocation(SystemActors.World | SystemActors.EditorWorld)]
+	[Desc("Creates a greyscale palette without any base palette file.")]
+	class PaletteFromGrayscaleInfo : TraitInfo
+	{
+		[PaletteDefinition]
+		[FieldLoader.Require]
+		[Desc("internal palette name")]
+		public readonly string Name = null;
+
+		[Desc("If defined, load the palette only for this tileset.")]
+		public readonly string Tileset = null;
+
+		public readonly bool AllowModifiers = true;
+
+		[Desc("Index set to be fully transparent/invisible.")]
+		public readonly int TransparentIndex = 0;
+
+		public override object Create(ActorInitializer init) { return new PaletteFromGrayscale(init.World, this); }
+	}
+
+	class PaletteFromGrayscale : ILoadsPalettes
+	{
+		readonly World world;
+		readonly PaletteFromGrayscaleInfo info;
+		public PaletteFromGrayscale(World world, PaletteFromGrayscaleInfo info)
+		{
+			this.world = world;
+			this.info = info;
+		}
+
+		public void LoadPalettes(WorldRenderer wr)
+		{
+			// Enable palette only for a specific tileset
+			if (info.Tileset != null && !string.Equals(info.Tileset, world.Map.Tileset, System.StringComparison.InvariantCultureIgnoreCase))
+				return;
+
+			wr.AddPalette(info.Name, new ImmutablePalette(Enumerable.Range(0, Palette.Size).Select(i => (i == info.TransparentIndex) ? 0 : (uint)Color.FromArgb(255, i, i, i).ToArgb())), info.AllowModifiers);
+		}
+	}
+}