Change IPostRenderSelection and IPlaceBuildingDecoration to return renderables.

OpenRA.Mods.RA/Buildings/BaseProvider.cs

@@ -1,6 +1,6 @@
 #region Copyright & License Information
 /*
- * Copyright 2007-2011 The OpenRA Developers (see AUTHORS)
+ * Copyright 2007-2014 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. For more information,
@@ -8,6 +8,7 @@
  */
 #endregion
 
+using System.Collections.Generic;
 using System.Drawing;
 using OpenRA.Graphics;
 using OpenRA.Mods.RA.Graphics;
@@ -62,20 +63,19 @@ namespace OpenRA.Mods.RA.Buildings
 			return self.Owner == self.World.RenderPlayer || (allyBuildRadius && self.Owner.IsAlliedWith(self.World.RenderPlayer));
 		}
 
-		// Range circle
-		public void RenderAfterWorld(WorldRenderer wr)
+		public IEnumerable<IRenderable> RenderAfterWorld(WorldRenderer wr)
 		{
 			// Visible to player and allies
 			if (!ValidRenderPlayer())
-				return;
+				yield break;
 
-			new RangeCircleRenderable(
+			yield return new RangeCircleRenderable(
 				self.CenterPosition,
 				WRange.FromCells(Info.Range),
 				0,
 				Color.FromArgb(128, Ready() ? Color.White : Color.Red),
 				Color.FromArgb(96, Color.Black)
-			).Render(wr);
+			);
 		}
 
 		// Selection bar