feat: add readonly map option

This option will prevent the map from being updated by the renderer. It can be used if you want a "natural" map, i.e. you want to generate a map and preserve it without being updated with users buildings.

DynmapCore/src/main/java/org/dynmap/MapManager.java

@@ -629,12 +629,14 @@ public class MapManager {
                     renderedmaps.addAll(map.getMapsSharingRender(world));
 
                     /* Now, prime the render queue */
+                    if (map.isReadOnly() == false) {
                         for (MapTile mt : map.getTiles(world, (int)loc.x, (int)loc.y, (int)loc.z)) {
                             if (!found.getFlag(mt.tileOrdinalX(), mt.tileOrdinalY())) {
                                 found.setFlag(mt.tileOrdinalX(), mt.tileOrdinalY(), true);
                                 renderQueue.add(mt);
                             }
                         }
+                    }
                     if(!updaterender) { /* Only add other seed points for fullrender */
                         /* Add spawn location too (helps with some worlds where 0,64,0 may not be generated */
                         DynmapLocation sloc = world.getSpawnLocation();
@@ -1072,6 +1074,10 @@ public class MapManager {
             tiles.clear();
             for(DynmapWorld w : worlds) {
                 for(MapTypeState mts : w.mapstate) {
+                    if (mts.type.isReadOnly()) {
+                        continue;
+                    }
+
                     if(mts.getNextInvalidTileCoord(coord)) {
                         mts.type.addMapTiles(tiles, w, coord.x, coord.y);
                         mts.validateTile(coord.x, coord.y);
@@ -1903,6 +1909,10 @@ public class MapManager {
                 }
                 if(world == null) continue;
                 for (MapTypeState mts : world.mapstate) {
+                    if (mts.type.isReadOnly()) {
+                        continue;
+                    }
+
                     List<TileFlags.TileCoord> tiles = mts.type.getTileCoords(world, evt.x, evt.y, evt.z);
                     invalidates += mts.invalidateTiles(tiles);
                 }
@@ -1935,6 +1945,10 @@ public class MapManager {
                 if(world == null) continue;
                 int invalidates = 0;
                 for (MapTypeState mts : world.mapstate) {
+                    if (mts.type.isReadOnly()) {
+                        continue;
+                    }
+
                     List<TileFlags.TileCoord> tiles = mts.type.getTileCoords(world, evt.xmin, evt.ymin, evt.zmin, evt.xmax, evt.ymax, evt.zmax);
                     invalidates += mts.invalidateTiles(tiles);
                 }

DynmapCore/src/main/java/org/dynmap/MapType.java

@@ -10,6 +10,10 @@ import org.json.simple.JSONObject;
 
 public abstract class MapType {
     private boolean is_protected;
+    /**
+     * Is the map type read-only? (i.e. should not be updated by renderer)
+     */
+    private boolean is_readonly;
     protected int tileupdatedelay;
     
     public enum ImageVariant {
@@ -207,6 +211,26 @@ public abstract class MapType {
         }
         return false;
     }
+    /**
+     * Is the map type read-only? (i.e. should not be updated by renderer)
+     * @return true if read-only
+     */
+    public boolean isReadOnly() {
+        return is_readonly;
+    }
+
+    /**
+     * Set read-only state of map type
+     * @param r - true if read-only
+     * @return true if state changed
+     */
+    public boolean setReadOnly(boolean r) {
+        if(is_readonly != r) {
+            is_readonly = r;
+            return true;
+        }
+        return false;
+    }
     public abstract String getPrefix();
     
     public int getTileUpdateDelay(DynmapWorld w) {

DynmapCore/src/main/java/org/dynmap/hdmap/HDMap.java

@@ -153,6 +153,7 @@ public class HDMap extends MapType {
         this.append_to_world = configuration.getString("append_to_world", "");
         setProtected(configuration.getBoolean("protected", false));
         setTileUpdateDelay(configuration.getInteger("tileupdatedelay", -1));
+        setReadOnly(configuration.getBoolean("readonly", false));
     }
 
     public ConfigurationNode saveConfiguration() {

DynmapCore/src/main/java/org/dynmap/hdmap/HDMapManager.java

@@ -131,6 +131,12 @@ public class HDMapManager {
                     /* If limited to one map, and this isn't it, skip */
                     if((mapname != null) && (!hdmap.getName().equals(mapname)))
                         continue;
+
+                    // Maps can be set to read-only, which means they don't get re-rendered
+                    if (map.isReadOnly()) {
+                        continue;
+                    }
+
                     shaders.add(hdmap.getShader().getStateInstance(hdmap, cache, mapiter, scale));
                 }
             }

DynmapCore/src/main/java/org/dynmap/hdmap/IsoHDPerspective.java

@@ -1268,7 +1268,7 @@ public class IsoHDPerspective implements HDPerspective {
         // Mark the tiles we're going to render as validated
         for (int i = 0; i < numshaders; i++) {
             MapTypeState mts = world.getMapState(shaderstate[i].getMap());
-            if (mts != null) {
+            if (mts != null && mts.type.isReadOnly() == false) {
                 mts.validateTile(tile.tx, tile.ty);
             }
         }