Salvage dungeons (#14520)

Content.Server/Decals/DecalSystem.cs

@@ -319,6 +319,33 @@ namespace Content.Server.Decals
             return decalIds;
         }
 
+        public HashSet<(uint Index, Decal Decal)> GetDecalsIntersecting(EntityUid gridUid, Box2 bounds, DecalGridComponent? component = null)
+        {
+            var decalIds = new HashSet<(uint, Decal)>();
+            var chunkCollection = ChunkCollection(gridUid, component);
+
+            if (chunkCollection == null)
+                return decalIds;
+
+            var chunks = new ChunkIndicesEnumerator(bounds, ChunkSize);
+
+            while (chunks.MoveNext(out var chunkOrigin))
+            {
+                if (!chunkCollection.TryGetValue(chunkOrigin.Value, out var chunk))
+                    continue;
+
+                foreach (var (id, decal) in chunk.Decals)
+                {
+                    if (!bounds.Contains(decal.Coordinates))
+                        continue;
+
+                    decalIds.Add((id, decal));
+                }
+            }
+
+            return decalIds;
+        }
+
         /// <summary>
         ///     Changes a decals position. Note this will actually result in a new decal being created, possibly on a new grid or chunk.
         /// </summary>