Add EmbeddedSpritePalette sprite metadata.

OpenRA.Mods.Common/Traits/World/PaletteFromEmbeddedSpritePalette.cs

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+#region Copyright & License Information
+/*
+ * Copyright 2007-2018 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.Collections.Generic;
+using System.Linq;
+using OpenRA.FileSystem;
+using OpenRA.Graphics;
+using OpenRA.Mods.Common.Graphics;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	public class PaletteFromEmbeddedSpritePaletteInfo : ITraitInfo, IProvidesCursorPaletteInfo
+	{
+		[FieldLoader.Require, PaletteDefinition]
+		[Desc("Internal palette name")]
+		public readonly string Name = null;
+
+		[FieldLoader.Require]
+		[Desc("Sequence image holding the palette definition")]
+		public readonly string Image = null;
+
+		[FieldLoader.Require]
+		[Desc("Sequence holding the palette definition")]
+		public readonly string Sequence = null;
+
+		[Desc("Allow palette modifiers to change the palette.")]
+		public readonly bool AllowModifiers = true;
+
+		[Desc("Whether this palette is available for cursors.")]
+		public readonly bool CursorPalette = false;
+
+		public object Create(ActorInitializer init) { return new PaletteFromEmbeddedSpritePalette(this); }
+
+		string IProvidesCursorPaletteInfo.Palette { get { return CursorPalette ? Name : null; } }
+
+		ImmutablePalette IProvidesCursorPaletteInfo.ReadPalette(IReadOnlyFileSystem fileSystem)
+		{
+			var sequence = (DefaultSpriteSequence)Game.ModData.DefaultSequences.Values.First().GetSequence(Image, Sequence);
+			return new ImmutablePalette(sequence.EmbeddedPalette);
+		}
+	}
+
+	public class PaletteFromEmbeddedSpritePalette : ILoadsPalettes, IProvidesAssetBrowserPalettes
+	{
+		readonly PaletteFromEmbeddedSpritePaletteInfo info;
+		public PaletteFromEmbeddedSpritePalette(PaletteFromEmbeddedSpritePaletteInfo info) { this.info = info; }
+
+		public void LoadPalettes(WorldRenderer wr)
+		{
+			var sequence = (DefaultSpriteSequence)wr.World.Map.Rules.Sequences.GetSequence(info.Image, info.Sequence);
+			wr.AddPalette(info.Name, new ImmutablePalette(sequence.EmbeddedPalette), info.AllowModifiers);
+		}
+
+		public IEnumerable<string> PaletteNames { get { yield return info.Name; } }
+	}
+}