Navmap rework (#26713)

* Optimized the drawing of lines and tracked entities

* Optimized nav map updating and added thin wall support

* Added support for thin doors

* Removed floor tile seams, more line drawing optimizations

* Fixed split grids not updating correctly

* Cleaned up NavMapControl code

* Fix nav map header

* Converted nav map updates from system network messages to delta-states

* Addressed review comments

* Fixed timing issue where NavMapSystem would update before AirtightSystem did

Content.Shared/Pinpointer/NavMapComponent.cs

@@ -1,9 +1,12 @@
+using Content.Shared.Atmos;
 using Robust.Shared.GameStates;
+using Robust.Shared.Serialization;
+using Robust.Shared.Timing;
 
 namespace Content.Shared.Pinpointer;
 
 /// <summary>
-/// Used to store grid poly data to be used for UIs.
+/// Used to store grid data to be used for UIs.
 /// </summary>
 [RegisterComponent, NetworkedComponent]
 public sealed partial class NavMapComponent : Component
@@ -12,25 +15,57 @@ public sealed partial class NavMapComponent : Component
      * Don't need DataFields as this can be reconstructed
      */
 
+    /// <summary>
+    /// Bitmasks that represent chunked tiles.
+    /// </summary>
     [ViewVariables]
-    public readonly Dictionary<Vector2i, NavMapChunk> Chunks = new();
+    public Dictionary<(NavMapChunkType, Vector2i), NavMapChunk> Chunks = new();
 
-    [ViewVariables] public readonly List<SharedNavMapSystem.NavMapBeacon> Beacons = new();
-
-    [ViewVariables] public readonly List<SharedNavMapSystem.NavMapAirlock> Airlocks = new();
+    /// <summary>
+    /// List of station beacons.
+    /// </summary>
+    [ViewVariables]
+    public HashSet<SharedNavMapSystem.NavMapBeacon> Beacons = new();
 }
 
+[Serializable, NetSerializable]
 public sealed class NavMapChunk
 {
+    /// <summary>
+    /// The chunk origin
+    /// </summary>
     public readonly Vector2i Origin;
 
     /// <summary>
-    /// Bitmask for tiles, 1 for occupied and 0 for empty.
+    /// Bitmask for tiles, 1 for occupied and 0 for empty. There is a bitmask for each cardinal direction,
+    /// representing each edge of the tile, in case the entities inside it do not entirely fill it
     /// </summary>
-    public int TileData;
+    public Dictionary<AtmosDirection, ushort> TileData;
+
+    /// <summary>
+    /// The last game tick that the chunk was updated
+    /// </summary>
+    [NonSerialized]
+    public GameTick LastUpdate;
 
     public NavMapChunk(Vector2i origin)
     {
         Origin = origin;
+
+        TileData = new()
+        {
+            [AtmosDirection.North] = 0,
+            [AtmosDirection.East] = 0,
+            [AtmosDirection.South] = 0,
+            [AtmosDirection.West] = 0,
+        };
     }
 }
+
+public enum NavMapChunkType : byte
+{
+    Invalid,
+    Floor,
+    Wall,
+    Airlock,
+}