Move ClassicFacingFudge support to Mods.Cnc

This moves the TD/RA-specific re-mapping of sprite facings
and coordinates to Mods.Cnc.

OpenRA.Mods.Cnc/Graphics/ClassicTilesetSpecificSpriteSequence.cs

@@ -0,0 +1,92 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2020 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.Graphics;
+
+namespace OpenRA.Mods.Cnc.Graphics
+{
+	public class ClassicTilesetSpecificSpriteSequenceLoader : ClassicSpriteSequenceLoader
+	{
+		public readonly string DefaultSpriteExtension = ".shp";
+		public readonly Dictionary<string, string> TilesetExtensions = new Dictionary<string, string>();
+		public readonly Dictionary<string, string> TilesetCodes = new Dictionary<string, string>();
+
+		public ClassicTilesetSpecificSpriteSequenceLoader(ModData modData)
+			: base(modData)
+		{
+			var metadata = modData.Manifest.Get<SpriteSequenceFormat>().Metadata;
+			MiniYaml yaml;
+			if (metadata.TryGetValue("DefaultSpriteExtension", out yaml))
+				DefaultSpriteExtension = yaml.Value;
+
+			if (metadata.TryGetValue("TilesetExtensions", out yaml))
+				TilesetExtensions = yaml.ToDictionary(kv => kv.Value);
+
+			if (metadata.TryGetValue("TilesetCodes", out yaml))
+				TilesetCodes = yaml.ToDictionary(kv => kv.Value);
+		}
+
+		public override ISpriteSequence CreateSequence(ModData modData, TileSet tileSet, SpriteCache cache, string sequence, string animation, MiniYaml info)
+		{
+			return new ClassicTilesetSpecificSpriteSequence(modData, tileSet, cache, this, sequence, animation, info);
+		}
+	}
+
+	public class ClassicTilesetSpecificSpriteSequence : ClassicSpriteSequence
+	{
+		public ClassicTilesetSpecificSpriteSequence(ModData modData, TileSet tileSet, SpriteCache cache, ISpriteSequenceLoader loader, string sequence, string animation, MiniYaml info)
+			: base(modData, tileSet, cache, loader, sequence, animation, info) { }
+
+		string ResolveTilesetId(TileSet tileSet, Dictionary<string, MiniYaml> d)
+		{
+			var tsId = tileSet.Id;
+
+			MiniYaml yaml;
+			if (d.TryGetValue("TilesetOverrides", out yaml))
+			{
+				var tsNode = yaml.Nodes.FirstOrDefault(n => n.Key == tsId);
+				if (tsNode != null)
+					tsId = tsNode.Value.Value;
+			}
+
+			return tsId;
+		}
+
+		protected override string GetSpriteSrc(ModData modData, TileSet tileSet, string sequence, string animation, string sprite, Dictionary<string, MiniYaml> d)
+		{
+			var loader = (ClassicTilesetSpecificSpriteSequenceLoader)Loader;
+
+			var spriteName = sprite ?? sequence;
+
+			if (LoadField(d, "UseTilesetCode", false))
+			{
+				string code;
+				if (loader.TilesetCodes.TryGetValue(ResolveTilesetId(tileSet, d), out code))
+					spriteName = spriteName.Substring(0, 1) + code + spriteName.Substring(2, spriteName.Length - 2);
+			}
+
+			if (LoadField(d, "AddExtension", true))
+			{
+				var useTilesetExtension = LoadField(d, "UseTilesetExtension", false);
+
+				string tilesetExtension;
+				if (useTilesetExtension && loader.TilesetExtensions.TryGetValue(ResolveTilesetId(tileSet, d), out tilesetExtension))
+					return spriteName + tilesetExtension;
+
+				return spriteName + loader.DefaultSpriteExtension;
+			}
+
+			return spriteName;
+		}
+	}
+}