Add UISpriteRenderable for screen-space decorations.

OpenRA.Game/Graphics/UISpriteRenderable.cs

@@ -0,0 +1,61 @@
+#region Copyright & License Information
+/*
+ * 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,
+ * see COPYING.
+ */
+#endregion
+
+using System.Collections.Generic;
+using System.Drawing;
+using System.Linq;
+
+namespace OpenRA.Graphics
+{
+	public struct UISpriteRenderable : IRenderable
+	{
+		readonly Sprite sprite;
+		readonly int2 screenPos;
+		readonly int zOffset;
+		readonly PaletteReference palette;
+		readonly float scale;
+
+		public UISpriteRenderable(Sprite sprite, int2 screenPos, int zOffset, PaletteReference palette, float scale)
+		{
+			this.sprite = sprite;
+			this.screenPos = screenPos;
+			this.zOffset = zOffset;
+			this.palette = palette;
+			this.scale = scale;
+		}
+
+		// Does not exist in the world, so a world positions don't make sense
+		public WPos Pos { get { return WPos.Zero; } }
+		public WVec Offset { get { return WVec.Zero; } }
+		public bool IsDecoration { get { return true; } }
+
+		public float Scale { get { return scale; } }
+		public PaletteReference Palette { get { return palette; } }
+		public int ZOffset { get { return zOffset; } }
+
+		public IRenderable WithScale(float newScale) { return new UISpriteRenderable(sprite, screenPos, zOffset, palette, newScale); }
+		public IRenderable WithPalette(PaletteReference newPalette) { return new UISpriteRenderable(sprite, screenPos, zOffset, newPalette, scale); }
+		public IRenderable WithZOffset(int newOffset) { return this; }
+		public IRenderable OffsetBy(WVec vec) { return this; }
+		public IRenderable AsDecoration() { return this; }
+
+		public void BeforeRender(WorldRenderer wr) {}
+		public void Render(WorldRenderer wr)
+		{
+			Game.Renderer.SpriteRenderer.DrawSprite(sprite, screenPos, palette, sprite.size * scale);
+		}
+
+		public void RenderDebugGeometry(WorldRenderer wr)
+		{
+			var offset = screenPos + sprite.offset;
+			Game.Renderer.LineRenderer.DrawRect(offset, offset + sprite.size, Color.Red);
+		}
+	}
+}

OpenRA.Game/OpenRA.Game.csproj

@@ -240,6 +240,7 @@
     <Compile Include="Graphics\SelectionBoxRenderable.cs" />
     <Compile Include="Graphics\SelectionBarsRenderable.cs" />
     <Compile Include="Graphics\TargetLineRenderable.cs" />
+    <Compile Include="Graphics\UISpriteRenderable.cs" />
   </ItemGroup>
   <ItemGroup>
     <Compile Include="FileSystem\D2kSoundResources.cs" />