Replace NavMap dictionaries with int[] (#27602)

* Replace NavMap dictionaries with int[]

* Remove badly named const

* Remove unnecessary offset

* Prioritize airlocks

Content.Shared/Power/SharedPowerMonitoringConsoleSystem.cs

@@ -1,3 +1,4 @@
+using System.Runtime.CompilerServices;
 using JetBrains.Annotations;
 
 namespace Content.Shared.Power;
@@ -5,4 +6,23 @@ namespace Content.Shared.Power;
 [UsedImplicitly]
 public abstract class SharedPowerMonitoringConsoleSystem : EntitySystem
 {
+    // Chunk size is limited as we require ChunkSize^2 <= 32 (number of bits in an int)
+    public const int ChunkSize = 5;
+
+    /// <summary>
+    /// Converts the chunk's tile into a bitflag for the slot.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static int GetFlag(Vector2i relativeTile)
+    {
+        return 1 << (relativeTile.X * ChunkSize + relativeTile.Y);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Vector2i GetTileFromIndex(int index)
+    {
+        var x = index / ChunkSize;
+        var y = index % ChunkSize;
+        return new Vector2i(x, y);
+    }
 }