PNG spritesheet support, along with PaletteFromPng.

Cursor palette loader can now be specified via yaml.

OpenRA.Mods.Common/UtilityCommands/PngSheetImportMetadataCommand.cs

@@ -0,0 +1,87 @@
+#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.IO;
+using System.Net;
+using System.Text;
+using ICSharpCode.SharpZipLib.Checksums;
+
+namespace OpenRA.Mods.Common.UtilityCommands
+{
+	public class PngSheetImportMetadataCommand : IUtilityCommand
+	{
+		string IUtilityCommand.Name { get { return "--png-sheet-import"; } }
+
+		bool IUtilityCommand.ValidateArguments(string[] args)
+		{
+			return args.Length == 2;
+		}
+
+		[Desc("PNGFILE", "Import yaml metadata to png")]
+		void IUtilityCommand.Run(Utility utility, string[] args)
+		{
+			// HACK: This could eventually be merged into the Png class (add a Write method), however this requires complex png writing algorythms.
+			var rs = File.OpenRead(args[1]);
+			var ws = new MemoryStream();
+
+			using (var bw = new BinaryWriter(ws))
+			{
+				bw.Write(rs.ReadBytes(8));
+				var crc32 = new Crc32();
+
+				for (;;)
+				{
+					var length = IPAddress.NetworkToHostOrder(rs.ReadInt32());
+					var type = Encoding.UTF8.GetString(rs.ReadBytes(4));
+					var content = rs.ReadBytes(length);
+					var crc = rs.ReadUInt32();
+
+					switch (type)
+					{
+						case "tEXt":
+							break;
+
+						case "IEND":
+							rs.Close();
+
+							foreach (var node in MiniYaml.FromFile(Path.ChangeExtension(args[1], "yaml")))
+							{
+								bw.Write(IPAddress.NetworkToHostOrder(node.Key.Length + 1 + node.Value.Value.Length));
+								bw.Write("tEXt".ToCharArray());
+								bw.Write(node.Key.ToCharArray());
+								bw.Write((byte)0x00);
+								bw.Write(node.Value.Value.ToCharArray());
+								crc32.Reset();
+								crc32.Update(Encoding.ASCII.GetBytes("tEXt"));
+								crc32.Update(Encoding.ASCII.GetBytes(node.Key + (char)0x00 + node.Value.Value));
+								bw.Write((uint)IPAddress.NetworkToHostOrder((int)crc32.Value));
+							}
+
+							bw.Write(0);
+							bw.Write(type.ToCharArray());
+							bw.Write(crc);
+
+							File.WriteAllBytes(args[1], ws.ToArray());
+							ws.Close();
+							return;
+
+						default:
+							bw.Write(IPAddress.NetworkToHostOrder(length));
+							bw.Write(type.ToCharArray());
+							bw.Write(content);
+							bw.Write(crc);
+							break;
+					}
+				}
+			}
+		}
+	}
+}