fix #33 by ignoring zoom level 13

brings about 75% storage reduction

src/main/java/io/rudin/minetest/tileserver/TileRenderer.java

@@ -252,7 +252,8 @@ public class TileRenderer {
 
 				logger.trace("Timings of cross-stitched tile X={} Y={} Zoom={}: render={} ms", tileX, tileY, zoom, diff);
 
-				cache.put(layer.id, tileX, tileY, zoom, data);
+				if (zoom <= cfg.tileCacheMaxZoom())
+					cache.put(layer.id, tileX, tileY, zoom, data);
 
 				if (tile == null)
 					logger.error("Got a null-tile @ {}/{}/{} (data={})", tileX, tileY, zoom, data.length);
@@ -323,7 +324,8 @@ public class TileRenderer {
 					timingImageSetup, timingZeroCountCheck, timingRender, timingBufferOutput
 			);
 
-			cache.put(layer.id, tileX, tileY, zoom, data);
+			if (zoom <= cfg.tileCacheMaxZoom())
+				cache.put(layer.id, tileX, tileY, zoom, data);
 
 			if (tile == null)
 				logger.error("Got a null-tile @ {}/{}/{} (layer={},data={})", tileX, tileY, zoom, layer.id, data.length);

src/main/java/io/rudin/minetest/tileserver/config/TileServerConfig.java

@@ -98,6 +98,11 @@ public interface TileServerConfig extends Config {
 	tile cache stuff
 	 */
 
+	//max cached zoom, 12=default, 13=very file/storage-heavy
+	@Key("tile.cache.maxzoom")
+	@DefaultValue("12")
+	int tileCacheMaxZoom();
+
 	@Key("tile.cache.impl")
 	@DefaultValue("FILE")
 	CacheType tileCacheType();

src/main/java/io/rudin/minetest/tileserver/job/InitialTileRendererJob.java

@@ -104,6 +104,7 @@ public class InitialTileRendererJob implements Runnable {
                         double zProgress = (posz - minZ) / (double) zCount;
 
                         TileCoordinate tileCoordinate = CoordinateFactory.getTileCoordinateFromMapBlock(new MapBlockCoordinate(posx, posz));
+                        tileCoordinate = CoordinateFactory.getZoomedOutTile(tileCoordinate); //zoom out to 12 (max=13)
 
                         try {
                             byte[] data = renderer.render(layer, tileCoordinate.x, tileCoordinate.y, tileCoordinate.zoom);

src/main/java/io/rudin/minetest/tileserver/route/TileRoute.java

@@ -79,7 +79,7 @@ public class TileRoute implements Route {
 			if (layer == null)
 				throw new IllegalArgumentException("layer not found: " + layerid);
 
-			if (z < 2)
+			if (z < 2 || z > 12)
 				throw new IllegalArgumentException("Invalid zoom: " + z);
 
 			//check db cache

src/main/resources/public/js/map.js

@@ -20,7 +20,7 @@ tileserver.start = function(cfg, layerConfig){
 
     var map = L.map('image-map', {
       minZoom: 2,
-      maxZoom: 13,
+      maxZoom: 12,
       center: initialCenter,
       zoom: initialZoom,
       crs: crs

tileserver.properties

@@ -1,4 +1,4 @@
-#tilerenderer.initialrendering.enable=true
+tilerenderer.initialrendering.enable=true
 
 #log.tile.updatetimings=true
 tilerenderer.updateinterval=10