Replace NavMap dictionaries with int[] (#27602)

* Replace NavMap dictionaries with int[]

* Remove badly named const

* Remove unnecessary offset

* Prioritize airlocks

Content.Shared/Pinpointer/NavMapComponent.cs

@@ -12,8 +12,6 @@ namespace Content.Shared.Pinpointer;
 [RegisterComponent, NetworkedComponent]
 public sealed partial class NavMapComponent : Component
 {
-    public const int Categories = 4;
-
     /*
      * Don't need DataFields as this can be reconstructed
      */
@@ -28,62 +26,37 @@ public sealed partial class NavMapComponent : Component
     /// List of station beacons.
     /// </summary>
     [ViewVariables]
-    public HashSet<SharedNavMapSystem.NavMapBeacon> Beacons = new();
+    public Dictionary<NetEntity, SharedNavMapSystem.NavMapBeacon> Beacons = new();
 }
 
 [Serializable, NetSerializable]
-public sealed class NavMapChunk
+public sealed class NavMapChunk(Vector2i origin)
 {
     /// <summary>
     /// The chunk origin
     /// </summary>
-    public readonly Vector2i Origin;
+    [ViewVariables]
+    public readonly Vector2i Origin = origin;
 
     /// <summary>
-    /// Array with each entry corresponding to a <see cref="NavMapChunkType"/>.
-    /// Uses a 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
+    /// Array containing the chunk's data. The
     /// </summary>
-    public Dictionary<AtmosDirection, ushort>?[] TileData;
+    [ViewVariables]
+    public int[] TileData = new int[SharedNavMapSystem.ArraySize];
 
     /// <summary>
     /// The last game tick that the chunk was updated
     /// </summary>
     [NonSerialized]
     public GameTick LastUpdate;
-
-    public NavMapChunk(Vector2i origin)
-    {
-        Origin = origin;
-        TileData = new Dictionary<AtmosDirection, ushort>?[NavMapComponent.Categories];
-    }
-
-    public Dictionary<AtmosDirection, ushort> EnsureType(NavMapChunkType chunkType)
-    {
-        var data = TileData[(int) chunkType];
-
-        if (data == null)
-        {
-            data = new Dictionary<AtmosDirection, ushort>()
-            {
-                [AtmosDirection.North] = 0,
-                [AtmosDirection.East] = 0,
-                [AtmosDirection.South] = 0,
-                [AtmosDirection.West] = 0,
-            };
-
-            TileData[(int) chunkType] = data;
-        }
-
-        return data;
-    }
 }
 
 public enum NavMapChunkType : byte
 {
-    Invalid,
-    Floor,
-    Wall,
-    Airlock,
-    // Update the categories const if you update this.
+    // Values represent bit shift offsets when retrieving data in the tile array.
+    Invalid  = byte.MaxValue,
+    Floor = 0, // I believe floors have directional information for diagonal tiles?
+    Wall = SharedNavMapSystem.Directions,
+    Airlock = 2 * SharedNavMapSystem.Directions,
 }
+