Visualizer systems update (#8203)

* optimize appearance updating for subfloor entities

* sprite event args

* a

* stop double appearance update.

Content.Client/Power/Visualizers/CableVisualizerSystem.cs

@@ -0,0 +1,38 @@
+using Content.Client.SubFloor;
+using Content.Shared.SubFloor;
+using Content.Shared.Wires;
+using Robust.Client.GameObjects;
+
+namespace Content.Client.Power.Visualizers;
+
+public sealed partial class CableVisualizerSystem : EntitySystem
+{
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<CableVisualizerComponent, AppearanceChangeEvent>(OnAppearanceChanged, after: new[] { typeof(SubFloorHideSystem) });
+    }
+
+    private void OnAppearanceChanged(EntityUid uid, CableVisualizerComponent component, ref AppearanceChangeEvent args)
+    {
+        if (args.Sprite == null)
+            return;
+
+        if (args.Component.TryGetData(SubFloorVisuals.Covered, out bool isUnderCover)
+            && isUnderCover
+            && args.Component.TryGetData(SubFloorVisuals.ScannerRevealed, out bool revealed)
+            && !revealed)
+        {
+            // This entity is below a floor and is not even visible to the user -> don't bother updating sprite data.
+            // Note that if the subfloor visuals change, then another AppearanceChangeEvent will get triggered.
+            return;
+        }
+
+        if (!args.Component.TryGetData(WireVisVisuals.ConnectedMask, out WireVisDirFlags mask))
+            mask = WireVisDirFlags.None;
+
+        args.Sprite.LayerSetState(0, $"{component.StatePrefix}{(int) mask}");
+    }
+
+}