Split IPlaceBuildingPreviewGeneratorInfo from PBOG.

OpenRA.Mods.Common/Orders/PlaceBuildingOrderGenerator.cs

@@ -20,64 +20,76 @@ using OpenRA.Traits;
 
 namespace OpenRA.Mods.Common.Orders
 {
+	[Flags]
+	public enum PlaceBuildingCellType { None = 0, Valid = 1, Invalid = 2, LineBuild = 4 }
+
+	[RequireExplicitImplementation]
+	public interface IPlaceBuildingPreviewGeneratorInfo : ITraitInfoInterface
+	{
+		IPlaceBuildingPreview CreatePreview(WorldRenderer wr, ActorInfo ai, TypeDictionary init);
+	}
+
+	public interface IPlaceBuildingPreview
+	{
+		int2 TopLeftScreenOffset { get; }
+		void Tick();
+		IEnumerable<IRenderable> Render(WorldRenderer wr, CPos topLeft, Dictionary<CPos, PlaceBuildingCellType> footprint);
+	}
+
 	public class PlaceBuildingOrderGenerator : OrderGenerator
 	{
-		[Flags]
-		enum CellType { Valid = 0, Invalid = 1, LineBuild = 2 }
-
 		readonly ProductionQueue queue;
-		readonly ActorInfo actorInfo;
-		readonly BuildingInfo buildingInfo;
 		readonly PlaceBuildingInfo placeBuildingInfo;
 		readonly BuildingInfluence buildingInfluence;
-		readonly string faction;
-		readonly Sprite buildOk;
-		readonly Sprite buildBlocked;
 		readonly Viewport viewport;
-		readonly WVec centerOffset;
-		readonly int2 topLeftScreenOffset;
-		IActorPreview[] preview;
-
-		bool initialized;
+		readonly ActorInfo actorInfo;
+		readonly BuildingInfo buildingInfo;
+		readonly IPlaceBuildingPreview preview;
 
 		public PlaceBuildingOrderGenerator(ProductionQueue queue, string name, WorldRenderer worldRenderer)
 		{
 			var world = queue.Actor.World;
 			this.queue = queue;
-			viewport = worldRenderer.Viewport;
 			placeBuildingInfo = queue.Actor.Owner.PlayerActor.Info.TraitInfo<PlaceBuildingInfo>();
+			buildingInfluence = world.WorldActor.Trait<BuildingInfluence>();
+			viewport = worldRenderer.Viewport;
 
 			// Clear selection if using Left-Click Orders
 			if (Game.Settings.Game.UseClassicMouseStyle)
 				world.Selection.Clear();
 
-			var map = world.Map;
-			var tileset = world.Map.Tileset.ToLowerInvariant();
-
-			actorInfo = map.Rules.Actors[name];
+			actorInfo = world.Map.Rules.Actors[name];
 			buildingInfo = actorInfo.TraitInfo<BuildingInfo>();
-			centerOffset = buildingInfo.CenterOffset(world);
-			topLeftScreenOffset = -worldRenderer.ScreenPxOffset(centerOffset);
 
-			var buildableInfo = actorInfo.TraitInfo<BuildableInfo>();
-			var mostLikelyProducer = queue.MostLikelyProducer();
-			faction = buildableInfo.ForceFaction
-				?? (mostLikelyProducer.Trait != null ? mostLikelyProducer.Trait.Faction : queue.Actor.Owner.Faction.InternalName);
+			var previewGeneratorInfo = actorInfo.TraitInfoOrDefault<IPlaceBuildingPreviewGeneratorInfo>();
+			if (previewGeneratorInfo != null)
+			{
+				var faction = actorInfo.TraitInfo<BuildableInfo>().ForceFaction;
+				if (faction == null)
+				{
+					var mostLikelyProducer = queue.MostLikelyProducer();
+					faction = mostLikelyProducer.Trait != null ? mostLikelyProducer.Trait.Faction : queue.Actor.Owner.Faction.InternalName;
+				}
 
-			if (map.Rules.Sequences.HasSequence("overlay", "build-valid-{0}".F(tileset)))
-				buildOk = map.Rules.Sequences.GetSequence("overlay", "build-valid-{0}".F(tileset)).GetSprite(0);
-			else
-				buildOk = map.Rules.Sequences.GetSequence("overlay", "build-valid").GetSprite(0);
-			buildBlocked = map.Rules.Sequences.GetSequence("overlay", "build-invalid").GetSprite(0);
+				var td = new TypeDictionary()
+				{
+					new FactionInit(faction),
+					new OwnerInit(queue.Actor.Owner),
+				};
 
-			buildingInfluence = world.WorldActor.Trait<BuildingInfluence>();
+				foreach (var api in actorInfo.TraitInfos<IActorPreviewInitInfo>())
+					foreach (var o in api.ActorPreviewInits(actorInfo, ActorPreviewType.PlaceBuilding))
+						td.Add(o);
+
+				preview = previewGeneratorInfo.CreatePreview(worldRenderer, actorInfo, td);
+			}
 		}
 
-		CellType MakeCellType(bool valid, bool lineBuild = false)
+		PlaceBuildingCellType MakeCellType(bool valid, bool lineBuild = false)
 		{
-			var cell = valid ? CellType.Valid : CellType.Invalid;
+			var cell = valid ? PlaceBuildingCellType.Valid : PlaceBuildingCellType.Invalid;
 			if (lineBuild)
-				cell |= CellType.LineBuild;
+				cell |= PlaceBuildingCellType.LineBuild;
 
 			return cell;
 		}
@@ -98,6 +110,18 @@ namespace OpenRA.Mods.Common.Orders
 			return ret;
 		}
 
+		CPos TopLeft
+		{
+			get
+			{
+				var offsetPos = Viewport.LastMousePos;
+				if (preview != null)
+					offsetPos += preview.TopLeftScreenOffset;
+
+				return viewport.ViewToWorld(offsetPos);
+			}
+		}
+
 		IEnumerable<Order> InnerOrder(World world, CPos cell, MouseInput mi)
 		{
 			if (world.Paused)
@@ -107,7 +131,7 @@ namespace OpenRA.Mods.Common.Orders
 			if (mi.Button == MouseButton.Left)
 			{
 				var orderType = "PlaceBuilding";
-				var topLeft = viewport.ViewToWorld(Viewport.LastMousePos + topLeftScreenOffset);
+				var topLeft = TopLeft;
 
 				var plugInfo = actorInfo.TraitInfoOrDefault<PlugInfo>();
 				if (plugInfo != null)
@@ -152,11 +176,8 @@ namespace OpenRA.Mods.Common.Orders
 			if (queue.AllQueued().All(i => !i.Done || i.Item != actorInfo.Name))
 				world.CancelInputMode();
 
-			if (preview == null)
-				return;
-
-			foreach (var p in preview)
-				p.Tick();
+			if (preview != null)
+				preview.Tick();
 		}
 
 		bool AcceptsPlug(CPos cell, PlugInfo plug)
@@ -172,23 +193,15 @@ namespace OpenRA.Mods.Common.Orders
 		protected override IEnumerable<IRenderable> Render(WorldRenderer wr, World world) { yield break; }
 		protected override IEnumerable<IRenderable> RenderAboveShroud(WorldRenderer wr, World world)
 		{
-			var topLeft = viewport.ViewToWorld(Viewport.LastMousePos + topLeftScreenOffset);
-			var centerPosition = world.Map.CenterOfCell(topLeft) + centerOffset;
-			var rules = world.Map.Rules;
-
-			foreach (var dec in actorInfo.TraitInfos<IPlaceBuildingDecorationInfo>())
-				foreach (var r in dec.Render(wr, world, actorInfo, centerPosition))
-					yield return r;
-
-			var cells = new Dictionary<CPos, CellType>();
-
+			var topLeft = TopLeft;
+			var footprint = new Dictionary<CPos, PlaceBuildingCellType>();
 			var plugInfo = actorInfo.TraitInfoOrDefault<PlugInfo>();
 			if (plugInfo != null)
 			{
 				if (buildingInfo.Dimensions.X != 1 || buildingInfo.Dimensions.Y != 1)
 					throw new InvalidOperationException("Plug requires a 1x1 sized Building");
 
-				cells.Add(topLeft, MakeCellType(AcceptsPlug(topLeft, plugInfo)));
+				footprint.Add(topLeft, MakeCellType(AcceptsPlug(topLeft, plugInfo)));
 			}
 			else if (actorInfo.HasTraitInfo<LineBuildInfo>())
 			{
@@ -198,56 +211,19 @@ namespace OpenRA.Mods.Common.Orders
 
 				if (!Game.GetModifierKeys().HasModifier(Modifiers.Shift))
 					foreach (var t in BuildingUtils.GetLineBuildCells(world, topLeft, actorInfo, buildingInfo))
-						cells.Add(t.First, MakeCellType(buildingInfo.IsCloseEnoughToBase(world, world.LocalPlayer, actorInfo, t.First), true));
+						footprint.Add(t.First, MakeCellType(buildingInfo.IsCloseEnoughToBase(world, world.LocalPlayer, actorInfo, t.First), true));
 
-				cells[topLeft] = MakeCellType(buildingInfo.IsCloseEnoughToBase(world, world.LocalPlayer, actorInfo, topLeft));
+				footprint[topLeft] = MakeCellType(buildingInfo.IsCloseEnoughToBase(world, world.LocalPlayer, actorInfo, topLeft));
 			}
 			else
 			{
-				if (!initialized)
-				{
-					var td = new TypeDictionary()
-					{
-						new FactionInit(faction),
-						new OwnerInit(queue.Actor.Owner),
-					};
-
-					foreach (var api in actorInfo.TraitInfos<IActorPreviewInitInfo>())
-						foreach (var o in api.ActorPreviewInits(actorInfo, ActorPreviewType.PlaceBuilding))
-							td.Add(o);
-
-					var init = new ActorPreviewInitializer(actorInfo, wr, td);
-					preview = actorInfo.TraitInfos<IRenderActorPreviewInfo>()
-						.SelectMany(rpi => rpi.RenderPreview(init))
-						.ToArray();
-
-					initialized = true;
-				}
-
-				var previewRenderables = preview
-					.SelectMany(p => p.Render(wr, centerPosition))
-					.OrderBy(WorldRenderer.RenderableScreenZPositionComparisonKey);
-
-				foreach (var r in previewRenderables)
-					yield return r;
-
 				var res = world.WorldActor.TraitOrDefault<ResourceLayer>();
 				var isCloseEnough = buildingInfo.IsCloseEnoughToBase(world, world.LocalPlayer, actorInfo, topLeft);
 				foreach (var t in buildingInfo.Tiles(topLeft))
-					cells.Add(t, MakeCellType(isCloseEnough && world.IsCellBuildable(t, actorInfo, buildingInfo) && (res == null || res.GetResource(t) == null)));
+					footprint.Add(t, MakeCellType(isCloseEnough && world.IsCellBuildable(t, actorInfo, buildingInfo) && (res == null || res.GetResource(t) == null)));
 			}
 
-			var cellPalette = wr.Palette(placeBuildingInfo.Palette);
-			var linePalette = wr.Palette(placeBuildingInfo.LineBuildSegmentPalette);
-			var topLeftPos = world.Map.CenterOfCell(topLeft);
-			foreach (var c in cells)
-			{
-				var tile = !c.Value.HasFlag(CellType.Invalid) ? buildOk : buildBlocked;
-				var pal = c.Value.HasFlag(CellType.LineBuild) ? linePalette : cellPalette;
-				var pos = world.Map.CenterOfCell(c.Key);
-				yield return new SpriteRenderable(tile, pos, new WVec(0, 0, topLeftPos.Z - pos.Z),
-					-511, pal, 1f, true);
-			}
+			return preview != null ? preview.Render(wr, topLeft, footprint) : Enumerable.Empty<IRenderable>();
 		}
 
 		protected override string GetCursor(World world, CPos cell, int2 worldPixel, MouseInput mi) { return "default"; }

OpenRA.Mods.Common/Traits/Buildings/ActorPreviewPlaceBuildingPreview.cs

@@ -0,0 +1,109 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2019 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;
+using OpenRA.Mods.Common.Graphics;
+using OpenRA.Mods.Common.Orders;
+using OpenRA.Primitives;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("Creates a building placement preview based on the map editor actor preview.")]
+	public class ActorPreviewPlaceBuildingPreviewInfo : FootprintPlaceBuildingPreviewInfo
+	{
+		[Desc("Enable the building's idle animation.")]
+		public readonly bool Animated = true;
+
+		[PaletteReference("OverridePaletteIsPlayerPalette")]
+		[Desc("Custom palette name.")]
+		public readonly string OverridePalette = null;
+
+		[Desc("Custom palette is a player palette BaseName.")]
+		public readonly bool OverridePaletteIsPlayerPalette = true;
+
+		[Desc("Footprint types to draw underneath the actor preview.")]
+		public readonly PlaceBuildingCellType FootprintUnderPreview = PlaceBuildingCellType.None;
+
+		[Desc("Footprint types to draw above the actor preview.")]
+		public readonly PlaceBuildingCellType FootprintOverPreview = PlaceBuildingCellType.Valid | PlaceBuildingCellType.LineBuild | PlaceBuildingCellType.Invalid;
+
+		protected override IPlaceBuildingPreview CreatePreview(WorldRenderer wr, ActorInfo ai, TypeDictionary init)
+		{
+			return new ActorPreviewPlaceBuildingPreviewPreview(wr, ai, this, init);
+		}
+
+		public override object Create(ActorInitializer init)
+		{
+			return new ActorPreviewPlaceBuildingPreview();
+		}
+	}
+
+	public class ActorPreviewPlaceBuildingPreview { }
+
+	class ActorPreviewPlaceBuildingPreviewPreview : FootprintPlaceBuildingPreviewPreview
+	{
+		readonly ActorPreviewPlaceBuildingPreviewInfo info;
+		readonly PaletteReference palette;
+		readonly IActorPreview[] preview;
+
+		public ActorPreviewPlaceBuildingPreviewPreview(WorldRenderer wr, ActorInfo ai, ActorPreviewPlaceBuildingPreviewInfo info, TypeDictionary init)
+			: base(wr, ai, info, init)
+		{
+			this.info = info;
+			var previewInit = new ActorPreviewInitializer(actorInfo, wr, init);
+			preview = actorInfo.TraitInfos<IRenderActorPreviewInfo>()
+				.SelectMany(rpi => rpi.RenderPreview(previewInit))
+				.ToArray();
+
+			if (!string.IsNullOrEmpty(info.OverridePalette))
+			{
+				var owner = init.Get<OwnerInit>().Value(wr.World);
+				palette = wr.Palette(info.OverridePaletteIsPlayerPalette ? info.OverridePalette + owner.InternalName : info.OverridePalette);
+			}
+		}
+
+		protected override void TickInner()
+		{
+			if (!info.Animated)
+				return;
+
+			foreach (var p in preview)
+				p.Tick();
+		}
+
+		protected override IEnumerable<IRenderable> RenderInner(WorldRenderer wr, CPos topLeft, Dictionary<CPos, PlaceBuildingCellType> footprint)
+		{
+			var centerPosition = wr.World.Map.CenterOfCell(topLeft) + centerOffset;
+			var previewRenderables = preview
+				.SelectMany(p => p.Render(wr, centerPosition));
+
+			if (palette != null)
+				previewRenderables = previewRenderables.Select(a => a.IsDecoration ? a : a.WithPalette(palette));
+
+			foreach (var r in RenderDecorations(wr, topLeft))
+				yield return r;
+
+			if (info.FootprintUnderPreview != PlaceBuildingCellType.None)
+				foreach (var r in RenderFootprint(wr, topLeft, footprint, info.FootprintUnderPreview))
+					yield return r;
+
+			foreach (var r in previewRenderables.OrderBy(WorldRenderer.RenderableScreenZPositionComparisonKey))
+				yield return r;
+
+			if (info.FootprintOverPreview != PlaceBuildingCellType.None)
+				foreach (var r in RenderFootprint(wr, topLeft, footprint, info.FootprintOverPreview))
+					yield return r;
+		}
+	}
+}

OpenRA.Mods.Common/Traits/Buildings/FootprintPlaceBuildingPreview.cs

@@ -0,0 +1,120 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2019 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;
+using OpenRA.Mods.Common.Orders;
+using OpenRA.Primitives;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("Creates a building placement preview showing only the building footprint.")]
+	public class FootprintPlaceBuildingPreviewInfo : TraitInfo<FootprintPlaceBuildingPreview>, IPlaceBuildingPreviewGeneratorInfo
+	{
+		[PaletteReference]
+		[Desc("Palette to use for rendering the placement sprite.")]
+		public readonly string Palette = TileSet.TerrainPaletteInternalName;
+
+		[PaletteReference]
+		[Desc("Palette to use for rendering the placement sprite for line build segments.")]
+		public readonly string LineBuildSegmentPalette = TileSet.TerrainPaletteInternalName;
+
+		protected virtual IPlaceBuildingPreview CreatePreview(WorldRenderer wr, ActorInfo ai, TypeDictionary init)
+		{
+			return new FootprintPlaceBuildingPreviewPreview(wr, ai, this, init);
+		}
+
+		IPlaceBuildingPreview IPlaceBuildingPreviewGeneratorInfo.CreatePreview(WorldRenderer wr, ActorInfo ai, TypeDictionary init)
+		{
+			return CreatePreview(wr, ai, init);
+		}
+	}
+
+	public class FootprintPlaceBuildingPreview { }
+
+	class FootprintPlaceBuildingPreviewPreview : IPlaceBuildingPreview
+	{
+		protected readonly ActorInfo actorInfo;
+		protected readonly WVec centerOffset;
+		readonly FootprintPlaceBuildingPreviewInfo info;
+		readonly IPlaceBuildingDecorationInfo[] decorations;
+		readonly int2 topLeftScreenOffset;
+		readonly Sprite buildOk;
+		readonly Sprite buildBlocked;
+
+		public FootprintPlaceBuildingPreviewPreview(WorldRenderer wr, ActorInfo ai, FootprintPlaceBuildingPreviewInfo info, TypeDictionary init)
+		{
+			actorInfo = ai;
+			this.info = info;
+			decorations = actorInfo.TraitInfos<IPlaceBuildingDecorationInfo>().ToArray();
+
+			var world = wr.World;
+			centerOffset = actorInfo.TraitInfo<BuildingInfo>().CenterOffset(world);
+			topLeftScreenOffset = -wr.ScreenPxOffset(centerOffset);
+
+			var tileset = world.Map.Tileset.ToLowerInvariant();
+			if (world.Map.Rules.Sequences.HasSequence("overlay", "build-valid-{0}".F(tileset)))
+				buildOk = world.Map.Rules.Sequences.GetSequence("overlay", "build-valid-{0}".F(tileset)).GetSprite(0);
+			else
+				buildOk = world.Map.Rules.Sequences.GetSequence("overlay", "build-valid").GetSprite(0);
+			buildBlocked = world.Map.Rules.Sequences.GetSequence("overlay", "build-invalid").GetSprite(0);
+		}
+
+		protected virtual void TickInner() { }
+
+		protected IEnumerable<IRenderable> RenderFootprint(WorldRenderer wr, CPos topLeft, Dictionary<CPos, PlaceBuildingCellType> footprint,
+			PlaceBuildingCellType filter = PlaceBuildingCellType.Invalid | PlaceBuildingCellType.Valid | PlaceBuildingCellType.LineBuild)
+		{
+			var cellPalette = wr.Palette(info.Palette);
+			var linePalette = wr.Palette(info.LineBuildSegmentPalette);
+			var topLeftPos = wr.World.Map.CenterOfCell(topLeft);
+			foreach (var c in footprint)
+			{
+				if ((c.Value & filter) == 0)
+					continue;
+
+				var tile = !c.Value.HasFlag(PlaceBuildingCellType.Invalid) ? buildOk : buildBlocked;
+				var pal = c.Value.HasFlag(PlaceBuildingCellType.LineBuild) ? linePalette : cellPalette;
+				var pos = wr.World.Map.CenterOfCell(c.Key);
+				var offset = new WVec(0, 0, topLeftPos.Z - pos.Z);
+				yield return new SpriteRenderable(tile, pos, offset, -511, pal, 1f, true);
+			}
+		}
+
+		protected IEnumerable<IRenderable> RenderDecorations(WorldRenderer wr, CPos topLeft)
+		{
+			var centerPosition = wr.World.Map.CenterOfCell(topLeft) + centerOffset;
+			foreach (var d in decorations)
+				foreach (var r in d.Render(wr, wr.World, actorInfo, centerPosition))
+					yield return r;
+		}
+
+		protected virtual IEnumerable<IRenderable> RenderInner(WorldRenderer wr, CPos topLeft, Dictionary<CPos, PlaceBuildingCellType> footprint)
+		{
+			foreach (var r in RenderDecorations(wr, topLeft))
+				yield return r;
+
+			foreach (var r in RenderFootprint(wr, topLeft, footprint))
+				yield return r;
+		}
+
+		IEnumerable<IRenderable> IPlaceBuildingPreview.Render(WorldRenderer wr, CPos topLeft, Dictionary<CPos, PlaceBuildingCellType> footprint)
+		{
+			return RenderInner(wr, topLeft, footprint);
+		}
+
+		void IPlaceBuildingPreview.Tick() { TickInner(); }
+
+		int2 IPlaceBuildingPreview.TopLeftScreenOffset { get { return topLeftScreenOffset; } }
+	}
+}

OpenRA.Mods.Common/Traits/Buildings/SequencePlaceBuildingPreview.cs

@@ -0,0 +1,101 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2019 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 OpenRA.Graphics;
+using OpenRA.Mods.Common.Orders;
+using OpenRA.Mods.Common.Traits.Render;
+using OpenRA.Primitives;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("Creates a building placement preview based on a defined sequence.")]
+	public class SequencePlaceBuildingPreviewInfo : FootprintPlaceBuildingPreviewInfo, Requires<RenderSpritesInfo>
+	{
+		[SequenceReference]
+		[Desc("Sequence name to use.")]
+		public readonly string Sequence = "idle";
+
+		[PaletteReference("SequencePaletteIsPlayerPalette")]
+		[Desc("Custom palette name.")]
+		public readonly string SequencePalette = null;
+
+		[Desc("Custom palette is a player palette BaseName.")]
+		public readonly bool SequencePaletteIsPlayerPalette = true;
+
+		[Desc("Footprint types to draw underneath the actor preview.")]
+		public readonly PlaceBuildingCellType FootprintUnderPreview = PlaceBuildingCellType.None;
+
+		[Desc("Footprint types to draw above the actor preview.")]
+		public readonly PlaceBuildingCellType FootprintOverPreview = PlaceBuildingCellType.Valid | PlaceBuildingCellType.LineBuild | PlaceBuildingCellType.Invalid;
+
+		protected override IPlaceBuildingPreview CreatePreview(WorldRenderer wr, ActorInfo ai, TypeDictionary init)
+		{
+			return new SequencePlaceBuildingPreviewPreview(wr, ai, this, init);
+		}
+
+		public override object Create(ActorInitializer init)
+		{
+			return new SequencePlaceBuildingPreview();
+		}
+	}
+
+	public class SequencePlaceBuildingPreview { }
+
+	class SequencePlaceBuildingPreviewPreview : FootprintPlaceBuildingPreviewPreview
+	{
+		readonly SequencePlaceBuildingPreviewInfo info;
+		readonly Animation preview;
+		readonly PaletteReference palette;
+
+		public SequencePlaceBuildingPreviewPreview(WorldRenderer wr, ActorInfo ai, SequencePlaceBuildingPreviewInfo info, TypeDictionary init)
+			: base(wr, ai, info, init)
+		{
+			this.info = info;
+			var owner = init.Get<OwnerInit>().Value(wr.World);
+			var faction = init.Get<FactionInit>().Value(wr.World);
+
+			var rsi = ai.TraitInfo<RenderSpritesInfo>();
+
+			if (!string.IsNullOrEmpty(info.SequencePalette))
+				palette = wr.Palette(info.SequencePaletteIsPlayerPalette ? info.SequencePalette + owner.InternalName : info.SequencePalette);
+			else
+				palette = wr.Palette(rsi.Palette ?? rsi.PlayerPalette + owner.InternalName);
+
+			preview = new Animation(wr.World, rsi.GetImage(ai, wr.World.Map.Rules.Sequences, faction));
+			preview.PlayRepeating(info.Sequence);
+		}
+
+		protected override void TickInner()
+		{
+			preview.Tick();
+		}
+
+		protected override IEnumerable<IRenderable> RenderInner(WorldRenderer wr, CPos topLeft, Dictionary<CPos, PlaceBuildingCellType> footprint)
+		{
+			foreach (var r in RenderDecorations(wr, topLeft))
+				yield return r;
+
+			if (info.FootprintUnderPreview != PlaceBuildingCellType.None)
+				foreach (var r in RenderFootprint(wr, topLeft, footprint, info.FootprintUnderPreview))
+					yield return r;
+
+			var centerPosition = wr.World.Map.CenterOfCell(topLeft) + centerOffset;
+			foreach (var r in preview.Render(centerPosition, WVec.Zero, 0, palette, 1.0f))
+				yield return r;
+
+			if (info.FootprintOverPreview != PlaceBuildingCellType.None)
+				foreach (var r in RenderFootprint(wr, topLeft, footprint, info.FootprintOverPreview))
+					yield return r;
+		}
+	}
+}

OpenRA.Mods.Common/Traits/Player/PlaceBuilding.cs

@@ -21,14 +21,6 @@ namespace OpenRA.Mods.Common.Traits
 	[Desc("Allows the player to execute build orders.", " Attach this to the player actor.")]
 	public class PlaceBuildingInfo : ITraitInfo
 	{
-		[PaletteReference]
-		[Desc("Palette to use for rendering the placement sprite.")]
-		public readonly string Palette = TileSet.TerrainPaletteInternalName;
-
-		[PaletteReference]
-		[Desc("Palette to use for rendering the placement sprite for line build segments.")]
-		public readonly string LineBuildSegmentPalette = TileSet.TerrainPaletteInternalName;
-
 		[Desc("Play NewOptionsNotification this many ticks after building placement.")]
 		public readonly int NewOptionsNotificationDelay = 10;
 

OpenRA.Mods.Common/UpdateRules/Rules/20190314/RemovePlaceBuildingPalettes.cs

@@ -0,0 +1,40 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2019 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;
+
+namespace OpenRA.Mods.Common.UpdateRules.Rules
+{
+	public class RemovePlaceBuildingPalettes : UpdateRule
+	{
+		public override string Name { get { return "Remove Palette and LineBuildSegmentPalette from PlaceBuilding"; } }
+		public override string Description
+		{
+			get
+			{
+				return "The Palette and LineBuildSegmentPalette fields have been moved from PlaceBuilding,\n" +
+					"to the *PlaceBuildingPreview traits.";
+			}
+		}
+
+		public override IEnumerable<string> UpdateActorNode(ModData modData, MiniYamlNode actorNode)
+		{
+			// Repairable isn't conditional or otherwise supports multiple traits, so LastChildMatching should be fine.
+			foreach (var placeBuilding in actorNode.ChildrenMatching("PlaceBuilding"))
+			{
+				placeBuilding.RemoveNodes("Palette");
+				placeBuilding.RemoveNodes("LineBuildSegmentPalette");
+			}
+
+			yield break;
+		}
+	}
+}

OpenRA.Mods.Common/UpdateRules/UpdatePath.cs

@@ -126,6 +126,7 @@ namespace OpenRA.Mods.Common.UpdateRules
 				new RefactorHarvesterIdle(),
 				new SplitHarvesterSpriteBody(),
 				new RenameAttackMoveConditions(),
+				new RemovePlaceBuildingPalettes(),
 			})
 		};
 

mods/cnc/rules/defaults.yaml

@@ -699,6 +699,7 @@
 	Building:
 		Dimensions: 1,1
 		Footprint: x
+	ActorPreviewPlaceBuildingPreview:
 	SoundOnDamageTransition:
 		DamagedSounds: xplos.aud
 		DestroyedSounds: crumble.aud
@@ -870,6 +871,7 @@
 		Footprint: x
 		BuildSounds: hvydoor1.aud
 		TerrainTypes: Clear,Road
+	FootprintPlaceBuildingPreview:
 	RequiresBuildableArea:
 		AreaTypes: building
 		Adjacent: 4

mods/d2k/rules/defaults.yaml

@@ -385,6 +385,7 @@
 		Footprint: x
 		TerrainTypes: Rock, Concrete
 		BuildSounds: BUILD1.WAV
+	ActorPreviewPlaceBuildingPreview:
 	RequiresBuildableArea:
 		AreaTypes: building
 		Adjacent: 3

mods/d2k/rules/structures.yaml

@@ -5,6 +5,7 @@
 		TerrainTypes: Rock
 		BuildSounds: CHUNG.WAV
 		AllowInvalidPlacement: true
+	FootprintPlaceBuildingPreview:
 	RequiresBuildableArea:
 		AreaTypes: building
 		Adjacent: 4
@@ -732,6 +733,7 @@ wall:
 	Building:
 		BuildSounds: CHUNG.WAV
 		TerrainTypes: Rock, Concrete
+	FootprintPlaceBuildingPreview:
 	RequiresBuildableArea:
 		AreaTypes: building
 		Adjacent: 7

mods/ra/rules/defaults.yaml

@@ -646,6 +646,7 @@
 		RequiresBaseProvider: True
 		BuildSounds: placbldg.aud, build5.aud
 		UndeploySounds: cashturn.aud
+	ActorPreviewPlaceBuildingPreview:
 	RequiresBuildableArea:
 		AreaTypes: building
 	SoundOnDamageTransition:
@@ -749,6 +750,7 @@
 		BuildSounds: placbldg.aud
 		TerrainTypes: Clear,Road
 		UndeploySounds: cashturn.aud
+	FootprintPlaceBuildingPreview:
 	RequiresBuildableArea:
 		AreaTypes: building
 		Adjacent: 7

mods/ts/rules/defaults.yaml

@@ -317,6 +317,9 @@
 		BuildSounds: place2.aud
 		TerrainTypes: Clear, Rough, Road, DirtRoad, Green, Sand, Pavement
 		UndeploySounds: cashturn.aud
+	ActorPreviewPlaceBuildingPreview:
+		Palette: placebuilding
+		LineBuildSegmentPalette: placelinesegment
 	RequiresBuildableArea:
 		AreaTypes: building
 		Adjacent: 4
@@ -466,6 +469,9 @@
 		BuildSounds: place2.aud
 		TerrainTypes: Clear, Rough, Road, DirtRoad, Green, Sand, Pavement
 		UndeploySounds: cashturn.aud
+	FootprintPlaceBuildingPreview:
+		Palette: placebuilding
+		LineBuildSegmentPalette: placelinesegment
 	RequiresBuildableArea:
 		AreaTypes: building
 		Adjacent: 7
@@ -513,6 +519,9 @@
 	Building:
 		BuildSounds: place2.aud
 		UndeploySounds: cashturn.aud
+	FootprintPlaceBuildingPreview:
+		Palette: placebuilding
+		LineBuildSegmentPalette: placelinesegment
 	KillsSelf:
 		RemoveInstead: true
 	RenderSprites:

mods/ts/rules/player.yaml

@@ -67,8 +67,6 @@ Player:
 	PlaceBuilding:
 		NewOptionsNotification: NewOptions
 		CannotPlaceNotification: BuildingCannotPlaceAudio
-		Palette: placebuilding
-		LineBuildSegmentPalette: placelinesegment
 	SupportPowerManager:
 	ScriptTriggers:
 	MissionObjectives: