Add InfiltrateForDecoration trait.

OpenRA.Mods.Common/Traits/Render/WithDecoration.cs

@@ -69,7 +69,17 @@ namespace OpenRA.Mods.Common.Traits.Render
 			Anim.PlayRepeating(info.Sequence);
 		}
 
-		public virtual bool ShouldRender(Actor self) { return true; }
+		protected virtual bool ShouldRender(Actor self)
+		{
+			if (self.World.RenderPlayer != null)
+			{
+				var stance = self.Owner.Stances[self.World.RenderPlayer];
+				if (!Info.ValidStances.HasStance(stance))
+					return false;
+			}
+
+			return true;
+		}
 
 		IEnumerable<IRenderable> IRenderAboveShroud.RenderAboveShroud(Actor self, WorldRenderer wr)
 		{
@@ -86,13 +96,6 @@ namespace OpenRA.Mods.Common.Traits.Render
 			if (IsTraitDisabled || self.IsDead || !self.IsInWorld || Anim == null)
 				return Enumerable.Empty<IRenderable>();
 
-			if (self.World.RenderPlayer != null)
-			{
-				var stance = self.Owner.Stances[self.World.RenderPlayer];
-				if (!Info.ValidStances.HasStance(stance))
-					return Enumerable.Empty<IRenderable>();
-			}
-
 			if (!ShouldRender(self) || self.World.FogObscures(self))
 				return Enumerable.Empty<IRenderable>();
 

OpenRA.Mods.D2k/Traits/Render/WithDecorationCarryable.cs

@@ -31,9 +31,9 @@ namespace OpenRA.Mods.D2k.Traits.Render
 			carryable = self.Trait<Carryable>();
 		}
 
-		public override bool ShouldRender(Actor self)
+		protected override bool ShouldRender(Actor self)
 		{
-			return carryable.Reserved;
+			return carryable.Reserved && base.ShouldRender(self);
 		}
 	}
 }

OpenRA.Mods.RA/OpenRA.Mods.RA.csproj

@@ -116,6 +116,7 @@
     <Compile Include="Scripting\Properties\ParatroopersProperties.cs" />
     <Compile Include="Traits\Render\WithDisguisingInfantryBody.cs" />
     <Compile Include="ImportRedAlertLegacyMapCommand.cs" />
+    <Compile Include="Traits\Infiltration\InfiltrateForDecoration.cs" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\OpenRA.Game\OpenRA.Game.csproj">

OpenRA.Mods.RA/Traits/Infiltration/InfiltrateForDecoration.cs

@@ -0,0 +1,43 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2016 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.Mods.Common.Traits.Render;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.RA.Traits
+{
+	[Desc("Reveals a decoration sprite to the indicated players when infiltrated.")]
+	class InfiltrateForDecorationInfo : WithDecorationInfo
+	{
+		public override object Create(ActorInitializer init) { return new InfiltrateForDecoration(init.Self, this); }
+	}
+
+	class InfiltrateForDecoration : WithDecoration, INotifyInfiltrated
+	{
+		readonly HashSet<Player> infiltrators = new HashSet<Player>();
+
+		public InfiltrateForDecoration(Actor self, InfiltrateForDecorationInfo info)
+			: base(self, info) { }
+
+		public void Infiltrated(Actor self, Actor infiltrator)
+		{
+			infiltrators.Add(infiltrator.Owner);
+		}
+
+		protected override bool ShouldRender(Actor self)
+		{
+			return self.World.RenderPlayer == null || infiltrators.Any(i =>
+				Info.ValidStances.HasStance(i.Stances[self.World.RenderPlayer]));
+		}
+	}
+}