Fix menu/exit fade effect for paused replays.

OpenRA.Mods.Common/Traits/PaletteEffects/MenuPaletteEffect.cs

@@ -9,6 +9,7 @@
  */
 #endregion
 
+using System.Collections.Generic;
 using System.Drawing;
 using OpenRA.Graphics;
 using OpenRA.Traits;
@@ -30,28 +31,45 @@ namespace OpenRA.Mods.Common.Traits
 		public object Create(ActorInitializer init) { return new MenuPaletteEffect(this); }
 	}
 
-	public class MenuPaletteEffect : IPaletteModifier, ITickRender, IWorldLoaded
+	public class MenuPaletteEffect : IPaletteModifier, IRender, IWorldLoaded
 	{
 		public enum EffectType { None, Black, Desaturated }
 		public readonly MenuPaletteEffectInfo Info;
 
-		int remainingFrames;
 		EffectType from = EffectType.Black;
 		EffectType to = EffectType.Black;
 
+		float frac = 0;
+		long startTime;
+		long endTime;
+
 		public MenuPaletteEffect(MenuPaletteEffectInfo info) { Info = info; }
 
 		public void Fade(EffectType type)
 		{
-			remainingFrames = Info.FadeLength;
+			startTime = Game.RunTime;
+			endTime = startTime + Game.Timestep * Info.FadeLength;
+			frac = 1;
+
 			from = to;
 			to = type;
 		}
 
-		void ITickRender.TickRender(WorldRenderer wr, Actor self)
+		IEnumerable<IRenderable> IRender.Render(Actor self, WorldRenderer wr)
 		{
-			if (remainingFrames > 0)
-				remainingFrames--;
+			if (endTime == 0)
+				yield break;
+
+			frac = (endTime - Game.RunTime) * 1f / (endTime - startTime);
+			if (frac < 0)
+				frac = startTime = endTime = 0;
+
+			yield break;
+		}
+
+		IEnumerable<Rectangle> IRender.ScreenBounds(Actor self, WorldRenderer wr)
+		{
+			yield break;
 		}
 
 		static Color ColorForEffect(EffectType t, Color orig)
@@ -71,7 +89,7 @@ namespace OpenRA.Mods.Common.Traits
 
 		public void AdjustPalette(IReadOnlyDictionary<string, MutablePalette> palettes)
 		{
-			if (to == EffectType.None && remainingFrames == 0)
+			if (to == EffectType.None && endTime == 0)
 				return;
 
 			foreach (var pal in palettes.Values)
@@ -81,12 +99,12 @@ namespace OpenRA.Mods.Common.Traits
 					var orig = pal.GetColor(x);
 					var t = ColorForEffect(to, orig);
 
-					if (remainingFrames == 0)
+					if (endTime == 0)
 						pal.SetColor(x, t);
 					else
 					{
 						var f = ColorForEffect(from, orig);
-						pal.SetColor(x, Exts.ColorLerp((float)remainingFrames / Info.FadeLength, t, f));
+						pal.SetColor(x, Exts.ColorLerp(frac, t, f));
 					}
 				}
 			}