allow animations to pause on low power

closes #2949

OpenRA.Game/Graphics/Animation.cs

@@ -15,14 +15,16 @@ namespace OpenRA.Graphics
 {
 	public class Animation
 	{
-		string name;
 		public Sequence CurrentSequence { get; private set; }
 		public bool IsDecoration = false;
+		public Func<bool> Paused;
+
+		Func<int> facingFunc;
+
 		int frame = 0;
 		bool backwards = false;
 		bool tickAlways;
-
-		Func<int> facingFunc;
+		string name;
 
 		public string Name { get { return name; } }
 
@@ -122,7 +124,8 @@ namespace OpenRA.Graphics
 
 		public void Tick()
 		{
-			Tick(40); // tick one frame
+			if (Paused == null || !Paused())
+				Tick(40); // tick one frame
 		}
 
 		public bool HasSequence(string seq) { return SequenceProvider.HasSequence(name, seq); }

OpenRA.Game/Graphics/AnimationWithOffset.cs

@@ -18,17 +18,19 @@ namespace OpenRA.Graphics
 		public readonly Animation Animation;
 		public readonly Func<WVec> OffsetFunc;
 		public readonly Func<bool> DisableFunc;
+		public readonly Func<bool> Paused;
 		public readonly Func<WPos, int> ZOffset;
 
 		public AnimationWithOffset(Animation a, Func<WVec> offset, Func<bool> disable)
-			: this(a, offset, disable, null) { }
+			: this(a, offset, disable, () => false, null) { }
 
 		public AnimationWithOffset(Animation a, Func<WVec> offset, Func<bool> disable, int zOffset)
-			: this(a, offset, disable, _ => zOffset) { }
+			: this(a, offset, disable, () => false, _ => zOffset) { }
 
-		public AnimationWithOffset(Animation a, Func<WVec> offset, Func<bool> disable, Func<WPos, int> zOffset)
+		public AnimationWithOffset(Animation a, Func<WVec> offset, Func<bool> disable, Func<bool> pause, Func<WPos, int> zOffset)
 		{
 			this.Animation = a;
+			this.Animation.Paused = pause;
 			this.OffsetFunc = offset;
 			this.DisableFunc = disable;
 			this.ZOffset = zOffset;
@@ -45,7 +47,7 @@ namespace OpenRA.Graphics
 
 		public static implicit operator AnimationWithOffset(Animation a)
 		{
-			return new AnimationWithOffset(a, null, null, null);
+			return new AnimationWithOffset(a, null, null, null, null);
 		}
 	}
 }

OpenRA.Game/Traits/Render/RenderSprites.cs

@@ -46,7 +46,7 @@ namespace OpenRA.Traits
 		{
 			get { return anims[""].Animation; }
 			protected set { anims[""] = new AnimationWithOffset(value,
-				anims[""].OffsetFunc, anims[""].DisableFunc, anims[""].ZOffset); }
+				anims[""].OffsetFunc, anims[""].DisableFunc, anims[""].Paused, anims[""].ZOffset); }
 		}
 
 		RenderSpritesInfo Info;