keep mapfile-writer/db from bit-rotting

src/org/oscim/database/mapfile/MapDatabase.java

@@ -32,12 +32,15 @@ import org.oscim.database.mapfile.header.MapFileInfo;
 import org.oscim.database.mapfile.header.SubFileParameter;
 import org.oscim.view.generator.JobTile;
 
+import android.os.Environment;
+
 /**
  * A class for reading binary map files.
  * <p>
  * This class is not thread-safe. Each thread should use its own instance.
  * 
- * @see <a href="http://code.google.com/p/mapsforge/wiki/SpecificationBinaryMapFile">Specification</a>
+ * @see <a
+ *      href="http://code.google.com/p/mapsforge/wiki/SpecificationBinaryMapFile">Specification</a>
  */
 public class MapDatabase implements IMapDatabase {
 	/**
@@ -83,7 +86,8 @@ public class MapDatabase implements IMapDatabase {
 	private static final int MAXIMUM_WAY_NODES_SEQUENCE_LENGTH = 8192;
 
 	/**
-	 * Maximum number of map objects in the zoom table which is considered as valid.
+	 * Maximum number of map objects in the zoom table which is considered as
+	 * valid.
 	 */
 	private static final int MAXIMUM_ZOOM_TABLE_OBJECTS = 65536;
 
@@ -270,17 +274,28 @@ public class MapDatabase implements IMapDatabase {
 	 */
 	@Override
 	public OpenResult open(Map<String, String> options) {
-
+		// if (options == null) {
+		// options = new HashMap<String, String>(1);
+		// options.put("mapfile", "/sdcard/bremen.map");
+		// }
 		try {
-			if (options == null || options.get("mapfile") == null) {
+			// if (options == null || options.get("mapfile") == null) {
-				// throw new IllegalArgumentException("mapFile must not be null");
+			// // throw new
-				return new OpenResult("no file!");
+			// // IllegalArgumentException("mapFile must not be null");
-			}
+			// return new OpenResult("no file!");
+			// }
 
 			// make sure to close any previously opened file first
 			close();
 
-			File file = new File(options.get("mapfile"));
+			File file = new File(Environment.getExternalStorageDirectory().getPath()
+					+ "/bremen.map");
+
+			System.out.println("load " + file + " "
+					+ (Environment.getExternalStorageDirectory().getPath()
+					+ "/bremen.map"));
+
+			// File file = new File(options.get("mapfile"));
 
 			// check if the file exists and is readable
 			if (!file.exists()) {
@@ -370,7 +385,8 @@ public class MapDatabase implements IMapDatabase {
 	}
 
 	/**
-	 * Processes a single block and executes the callback functions on all map elements.
+	 * Processes a single block and executes the callback functions on all map
+	 * elements.
 	 * 
 	 * @param queryParameters
 	 *            the parameters of the current query.
@@ -445,7 +461,8 @@ public class MapDatabase implements IMapDatabase {
 		for (long row = queryParameters.fromBlockY; row <= queryParameters.toBlockY; ++row) {
 			for (long column = queryParameters.fromBlockX; column <= queryParameters.toBlockX; ++column) {
 
-				// calculate the actual block number of the needed block in the file
+				// calculate the actual block number of the needed block in the
+				// file
 				long blockNumber = row * subFileParameter.blocksWidth + column;
 
 				// get the current index entry
@@ -454,7 +471,8 @@ public class MapDatabase implements IMapDatabase {
 
 				// check if the current query would still return a water tile
 				if (queryIsWater) {
-					// check the water flag of the current block in its index entry
+					// check the water flag of the current block in its index
+					// entry
 					queryIsWater &= (currentBlockIndexEntry & BITMASK_INDEX_WATER) != 0;
 					// queryReadWaterInfo = true;
 				}
@@ -496,7 +514,8 @@ public class MapDatabase implements IMapDatabase {
 					// the current block is empty, continue with the next block
 					continue;
 				} else if (currentBlockSize > ReadBuffer.MAXIMUM_BUFFER_SIZE) {
-					// the current block is too large, continue with the next block
+					// the current block is too large, continue with the next
+					// block
 					LOG.warning("current block size too large: " + currentBlockSize);
 					continue;
 				} else if (currentBlockPointer + currentBlockSize > mFileSize) {
@@ -538,7 +557,8 @@ public class MapDatabase implements IMapDatabase {
 		// Tag[] tags = new Tag[1];
 		// tags[0] = TAG_NATURAL_WATER;
 		//
-		// System.arraycopy(WATER_TILE_COORDINATES, 0, mWayNodes, mWayNodePosition, 8);
+		// System.arraycopy(WATER_TILE_COORDINATES, 0, mWayNodes,
+		// mWayNodePosition, 8);
 		// mWayNodePosition += 8;
 		// mapDatabaseCallback.renderWaterBackground(tags, wayDataContainer);
 		// }
@@ -548,7 +568,8 @@ public class MapDatabase implements IMapDatabase {
 	/**
 	 * Processes the block signature, if present.
 	 * 
-	 * @return true if the block signature could be processed successfully, false otherwise.
+	 * @return true if the block signature could be processed successfully,
+	 *         false otherwise.
 	 */
 	private boolean processBlockSignature() {
 		if (mDebugFile) {
@@ -569,7 +590,8 @@ public class MapDatabase implements IMapDatabase {
 	 *            the callback which handles the extracted POIs.
 	 * @param numberOfPois
 	 *            how many POIs should be processed.
-	 * @return true if the POIs could be processed successfully, false otherwise.
+	 * @return true if the POIs could be processed successfully, false
+	 *         otherwise.
 	 */
 	private boolean processPOIs(IMapDatabaseCallback mapDatabaseCallback, int numberOfPois) {
 		Tag[] poiTags = sMapFileHeader.getMapFileInfo().poiTags;
@@ -637,7 +659,8 @@ public class MapDatabase implements IMapDatabase {
 			// check if the POI has an elevation
 			if ((featureByte & POI_FEATURE_ELEVATION) != 0) {
 				mReadBuffer.readSignedInt();
-				// mReadBuffer.getPositionAndSkip();// tags.add(new Tag(Tag.TAG_KEY_ELE,
+				// mReadBuffer.getPositionAndSkip();// tags.add(new
+				// Tag(Tag.TAG_KEY_ELE,
 				// Integer.toString(mReadBuffer.readSignedInt())));
 			}
 
@@ -785,7 +808,8 @@ public class MapDatabase implements IMapDatabase {
 	 *            the callback which handles the extracted ways.
 	 * @param numberOfWays
 	 *            how many ways should be processed.
-	 * @return true if the ways could be processed successfully, false otherwise.
+	 * @return true if the ways could be processed successfully, false
+	 *         otherwise.
 	 */
 	private boolean processWays(QueryParameters queryParameters,
 			IMapDatabaseCallback mapDatabaseCallback,
@@ -882,12 +906,13 @@ public class MapDatabase implements IMapDatabase {
 				textPos[0] = mReadBuffer.readUnsignedInt();
 				String str = mReadBuffer.readUTF8EncodedStringAt(stringOffset
 						+ textPos[0]);
-				if (changed) {
+				// if (changed) {
-					Tag[] tmp = tags;
+				// Tag[] tmp = tags;
-					tags = new Tag[tmp.length + 1];
+				// tags = new Tag[tmp.length + 1];
-					System.arraycopy(tmp, 0, tags, 0, tmp.length);
+				// System.arraycopy(tmp, 0, tags, 0, tmp.length);
-				}
+				// }
-				tags[tags.length - 1] = new Tag("name", str, false);
+				// tags[tags.length - 1] = new Tag(Tag.TAG_KEY_NAME, str,
+				// false);
 			}
 			else
 				textPos[0] = -1;
@@ -930,8 +955,13 @@ public class MapDatabase implements IMapDatabase {
 					return false;
 
 				// wayDataContainer.textPos = textPos;
+				int l = wayLengths[0];
+
+				boolean closed = mWayNodes[0] == mWayNodes[l - 2]
+						&& mWayNodes[1] == mWayNodes[l - 1];
+
 				mapDatabaseCallback
-						.renderWay(layer, tags, mWayNodes, wayLengths, changed);
+						.renderWay(layer, tags, mWayNodes, wayLengths, closed);
 			}
 		}
 
@@ -950,7 +980,8 @@ public class MapDatabase implements IMapDatabase {
 		return labelPosition;
 	}
 
-	// private int readOptionalWayDataBlocksByte(boolean featureWayDataBlocksByte) {
+	// private int readOptionalWayDataBlocksByte(boolean
+	// featureWayDataBlocksByte) {
 	// if (featureWayDataBlocksByte) {
 	// // get and check the number of way data blocks (VBE-U)
 	// return mReadBuffer.readUnsignedInt();

src/org/oscim/database/mapfile/header/MapFileHeader.java

@@ -85,7 +85,8 @@ public class MapFileHeader {
 	 *            the ReadBuffer for the file data.
 	 * @param fileSize
 	 *            the size of the map file in bytes.
-	 * @return a FileOpenResult containing an error message in case of a failure.
+	 * @return a FileOpenResult containing an error message in case of a
+	 *         failure.
 	 * @throws IOException
 	 *             if an error occurs while reading the file.
 	 */
@@ -107,7 +108,8 @@ public class MapFileHeader {
 			return openResult;
 		}
 
-		openResult = RequiredFields.readFileSize(readBuffer, fileSize, mapFileInfoBuilder);
+		openResult = RequiredFields
+				.readFileSize(readBuffer, fileSize, mapFileInfoBuilder);
 		if (!openResult.isSuccess()) {
 			return openResult;
 		}
@@ -151,8 +153,24 @@ public class MapFileHeader {
 		if (!openResult.isSuccess()) {
 			return openResult;
 		}
+		int[] level = new int[20];
+		level[17] = 16;
+		level[16] = 16;
+		level[15] = 16;
+		level[14] = 13;
+		level[13] = 13;
+		level[12] = 13;
+		level[11] = 10;
+		level[10] = 10;
+		level[9] = 10;
+		level[8] = 7;
+		level[7] = 7;
+		level[6] = 7;
+
+		mapFileInfoBuilder.zoomLevel = level;
 
 		this.mapFileInfo = mapFileInfoBuilder.build();
+
 		return OpenResult.SUCCESS;
 	}
 
@@ -196,7 +214,8 @@ public class MapFileHeader {
 
 			// check for valid zoom level range
 			if (zoomLevelMin > zoomLevelMax) {
-				return new OpenResult("invalid zoom level range: " + zoomLevelMin + SPACE + zoomLevelMax);
+				return new OpenResult("invalid zoom level range: " + zoomLevelMin + SPACE
+						+ zoomLevelMax);
 			}
 
 			// get and check the start address of the sub-file (8 bytes)

src/org/oscim/database/mapfile/header/MapFileInfo.java

@@ -59,7 +59,8 @@ public class MapFileInfo extends org.oscim.database.MapInfo {
 				mapFileInfoBuilder.fileVersion,
 				mapFileInfoBuilder.optionalFields.languagePreference,
 				mapFileInfoBuilder.optionalFields.comment,
-				mapFileInfoBuilder.optionalFields.createdBy, null);
+				mapFileInfoBuilder.optionalFields.createdBy,
+				mapFileInfoBuilder.zoomLevel);
 
 		debugFile = mapFileInfoBuilder.optionalFields.isDebugFile;
 

src/org/oscim/database/mapfile/header/MapFileInfoBuilder.java

@@ -28,6 +28,7 @@ class MapFileInfoBuilder {
 	String projectionName;
 	int tilePixelSize;
 	Tag[] wayTags;
+	int[] zoomLevel;
 
 	MapFileInfo build() {
 		return new MapFileInfo(this);

src/org/oscim/view/MapView.java

@@ -49,24 +49,17 @@ import android.view.MotionEvent;
 import android.widget.FrameLayout;
 
 /**
- * A MapView shows a map on the display of the device. It handles all user input and touch gestures to move and zoom the
+ * A MapView shows a map on the display of the device. It handles all user input
- * map.
+ * and touch gestures to move and zoom the map.
  */
 public class MapView extends FrameLayout {
 
 	final static String TAG = "MapView";
 
-	/**
-	 * Default render theme of the MapView.
-	 */
-	public static final InternalRenderTheme DEFAULT_RENDER_THEME = InternalRenderTheme.OSMARENDER;
-
-	// private static final float DEFAULT_TEXT_SCALE = 1;
-	// private static final Byte DEFAULT_START_ZOOM_LEVEL = Byte.valueOf((byte) 16);
-
 	public final static boolean debugFrameTime = false;
-
 	public final static boolean testRegionZoom = false;
+	private final boolean mDebugDatabase = false;
+
 	RegionLookup mRegionLookup;
 
 	public boolean enableRotation = false;
@@ -94,7 +87,8 @@ public class MapView extends FrameLayout {
 	 * @param context
 	 *            the enclosing MapActivity instance.
 	 * @throws IllegalArgumentException
-	 *             if the context object is not an instance of {@link MapActivity} .
+	 *             if the context object is not an instance of
+	 *             {@link MapActivity} .
 	 */
 	public MapView(Context context) {
 		this(context, null, MapDatabases.MAP_READER);
@@ -106,14 +100,13 @@ public class MapView extends FrameLayout {
 	 * @param attributeSet
 	 *            a set of attributes.
 	 * @throws IllegalArgumentException
-	 *             if the context object is not an instance of {@link MapActivity} .
+	 *             if the context object is not an instance of
+	 *             {@link MapActivity} .
 	 */
 	public MapView(Context context, AttributeSet attributeSet) {
 		this(context, attributeSet, MapDatabaseFactory.getMapDatabase(attributeSet));
 	}
 
-	private boolean mDebugDatabase = false;
-
 	private MapView(Context context, AttributeSet attributeSet,
 			MapDatabases mapDatabaseType) {
 
@@ -150,8 +143,11 @@ public class MapView extends FrameLayout {
 		for (int i = 0; i < mNumMapWorkers; i++) {
 			IMapDatabase mapDatabase;
 			if (mDebugDatabase) {
+				// mapDatabase = MapDatabaseFactory
+				// .createMapDatabase(MapDatabases.TEST_READER);
 				mapDatabase = MapDatabaseFactory
-						.createMapDatabase(MapDatabases.TEST_READER);
+						.createMapDatabase(MapDatabases.MAP_READER);
+				mNumMapWorkers = 1;
 			} else {
 				mapDatabase = MapDatabaseFactory.createMapDatabase(mapDatabaseType);
 			}
@@ -392,7 +388,8 @@ public class MapView extends FrameLayout {
 	 * @throws IllegalArgumentException
 	 *             if the supplied internalRenderTheme is null.
 	 * @throws FileNotFoundException
-	 *             if the supplied file does not exist, is a directory or cannot be read.
+	 *             if the supplied file does not exist, is a directory or cannot
+	 *             be read.
 	 */
 	public void setRenderTheme(String renderThemePath) throws FileNotFoundException {
 		if (renderThemePath == null) {
@@ -505,7 +502,8 @@ public class MapView extends FrameLayout {
 	}
 
 	/**
-	 * @return true if the current center position of this MapView is valid, false otherwise.
+	 * @return true if the current center position of this MapView is valid,
+	 *         false otherwise.
 	 */
 	boolean hasValidCenter() {
 		MapInfo mapInfo;
@@ -639,7 +637,8 @@ public class MapView extends FrameLayout {
 	// }
 
 	// /**
-	// * Sets the text scale for the map rendering. Has no effect in downloading mode.
+	// * Sets the text scale for the map rendering. Has no effect in downloading
+	// mode.
 	// *
 	// * @param textScale
 	// * the new text scale for the map rendering.

src/org/oscim/view/renderer/GLRenderer.java

@@ -102,7 +102,8 @@ public class GLRenderer implements GLSurfaceView.Renderer {
 	// lock to synchronize Main- and GL-Thread
 	static ReentrantLock tilelock = new ReentrantLock();
 
-	// used for passing tiles to be rendered from TileLoader(Main-Thread) to GLThread
+	// used for passing tiles to be rendered from TileLoader(Main-Thread) to
+	// GLThread
 	static class TilesData {
 		int cnt = 0;
 		final MapTile[] tiles;
@@ -337,7 +338,8 @@ public class GLRenderer implements GLSurfaceView.Renderer {
 		ShortBuffer sbuf = null;
 
 		// use multiple buffers to avoid overwriting buffer while current
-		// data is uploaded (or rather the blocking which is probably done to avoid this)
+		// data is uploaded (or rather the blocking which is probably done to
+		// avoid this)
 		if (uploadCnt >= rotateBuffers) {
 			uploadCnt = 0;
 			GLES20.glFlush();
@@ -453,7 +455,8 @@ public class GLRenderer implements GLSurfaceView.Renderer {
 					// on HTC it causes oom exception?!
 
 					// glBindBuffer(GL_ARRAY_BUFFER, vbo.id);
-					// glBufferData(GL_ARRAY_BUFFER, 0, null, GLES20.GL_STATIC_DRAW);
+					// glBufferData(GL_ARRAY_BUFFER, 0, null,
+					// GLES20.GL_STATIC_DRAW);
 
 					// recreate vbo instead
 					buf[0] = vbo.id;
@@ -581,7 +584,8 @@ public class GLRenderer implements GLSurfaceView.Renderer {
 			}
 		}
 
-		// proxies are clipped to the region where nothing was drawn to depth buffer
+		// proxies are clipped to the region where nothing was drawn to depth
+		// buffer
 		// TODO draw all parent before grandparent
 		for (int i = 0; i < tileCnt; i++) {
 			if (tiles[i].isVisible && !tiles[i].isReady) {
@@ -819,12 +823,7 @@ public class GLRenderer implements GLSurfaceView.Renderer {
 		mMapView.redrawMap();
 	}
 
-	void clearTiles() {
+	void clearTiles(int numTiles) {
-		int numTiles = (mWidth / (Tile.TILE_SIZE / 2) + 2)
-				* (mHeight / (Tile.TILE_SIZE / 2) + 2);
-
-		Log.d(TAG, "clearTiles " + numTiles);
-
 		drawTiles = new TilesData(numTiles);
 		curTiles = new TilesData(numTiles);
 	}

src/org/oscim/view/renderer/MapRenderer.java

@@ -20,6 +20,7 @@ import java.util.Collections;
 import org.oscim.core.MapPosition;
 import org.oscim.core.MercatorProjection;
 import org.oscim.core.Tile;
+import org.oscim.database.MapInfo;
 import org.oscim.theme.RenderTheme;
 import org.oscim.utils.GlConfigChooser;
 import org.oscim.view.MapView;
@@ -58,7 +59,11 @@ public class MapRenderer extends GLSurfaceView {
 	// private static MapPosition mCurPosition, mDrawPosition;
 	private static int mWidth = 0, mHeight = 0;
 
-	private static TilesData newTiles;
+	private static TilesData mCurrentTiles;
+
+	// map zoom-level to available zoom-levels in MapDatabase
+	// e.g. 16->16, 15->16, 14->13, 13->13, 12->13,....
+	private static int[] mZoomLevels;
 
 	public MapRenderer(Context context, MapView mapView) {
 		super(context);
@@ -90,8 +95,9 @@ public class MapRenderer extends GLSurfaceView {
 	 * called by MapView when position or map settings changes
 	 */
 	/**
-	 * Update list of visible tiles and passes them to MapRenderer, when not available tiles are created and added to
+	 * Update list of visible tiles and passes them to MapRenderer, when not
-	 * JobQueue (mapView.addJobs) for loading by TileGenerator class
+	 * available tiles are created and added to JobQueue (mapView.addJobs) for
+	 * loading by MapGenerator class
 	 * 
 	 * @param clear
 	 *            ...
@@ -108,33 +114,35 @@ public class MapRenderer extends GLSurfaceView {
 		MapPosition mapPosition = mMapView.getMapPosition().getMapPosition();
 
 		if (mapPosition == null) {
-			Log.d(TAG, ">>> no map position");
+			Log.d(TAG, "X no map position");
 			return;
 		}
 
 		if (clear) {
+			// remove all tiles references
 			Log.d(TAG, "CLEAR");
+			synchronized (GLRenderer.lock) {
+				for (MapTile t : mTiles)
+					clearTile(t);
 
+				mTiles.clear();
+				mTilesLoaded.clear();
+				QuadTree.init();
+			}
 			mInitial = true;
-			// FIXME still needed?
-			GLRenderer.tilelock.lock();
-
-			for (MapTile t : mTiles)
-				clearTile(t);
-
-			mTiles.clear();
-			mTilesLoaded.clear();
-			QuadTree.init();
-			GLRenderer.tilelock.unlock();
 		}
 
 		if (mInitial) {
-			mRenderer.clearTiles();
+			// set up TileData arrays that are passed to gl-thread
-
 			int numTiles = (mWidth / (Tile.TILE_SIZE / 2) + 2)
 					* (mHeight / (Tile.TILE_SIZE / 2) + 2);
-			Log.d(TAG, "newTiles: " + numTiles);
+
-			newTiles = new TilesData(numTiles);
+			mRenderer.clearTiles(numTiles);
+			mCurrentTiles = new TilesData(numTiles);
+
+			MapInfo mapInfo = mMapView.getMapDatabase().getMapInfo();
+			if (mapInfo != null)
+				mZoomLevels = mapInfo.zoomLevel;
 		}
 
 		byte zoomLevel = mapPosition.zoomLevel;
@@ -197,7 +205,16 @@ public class MapRenderer extends GLSurfaceView {
 
 	}
 
-	private static boolean updateVisibleList(MapPosition mapPosition, int zdir) {
+	/**
+	 * set mCurrentTiles for the visible tiles and pass it to GLRenderer, add
+	 * jobs for not yet loaded tiles
+	 * 
+	 * @param mapPosition
+	 *            the current MapPosition
+	 * @param zdir
+	 *            zoom direction
+	 */
+	private static void updateVisibleList(MapPosition mapPosition, int zdir) {
 		double x = mapPosition.x;
 		double y = mapPosition.y;
 		byte zoomLevel = mapPosition.zoomLevel;
@@ -223,12 +240,28 @@ public class MapRenderer extends GLSurfaceView {
 		mMapView.addJobs(null);
 
 		int tiles = 0;
-		if (newTiles == null)
+		int max = mCurrentTiles.tiles.length - 1;
-			return false;
 
-		int max = newTiles.tiles.length - 1;
+		boolean fetchChildren = false;
+		boolean fetchParent = false;
+		boolean fetchProxy = false;
+		if (mZoomLevels != null) {
+			// check MapDatabase zoom-level-mapping
+			if (mZoomLevels[zoomLevel] == 0) {
+				mCurrentTiles.cnt = 0;
+				mCurrentTiles = GLRenderer.updateTiles(mapPosition, mCurrentTiles);
+				return;
+			}
 
-		boolean prefetchChildren = true;
+			if (mZoomLevels[zoomLevel] > zoomLevel) {
+				fetchChildren = true;
+				fetchProxy = true;
+			}
+			else if (mZoomLevels[zoomLevel] < zoomLevel) {
+				fetchParent = true;
+				fetchProxy = true;
+			}
+		}
 
 		for (int yy = tileTop; yy <= tileBottom; yy++) {
 			for (int xx = tileLeft; xx <= tileRight; xx++) {
@@ -245,17 +278,34 @@ public class MapRenderer extends GLSurfaceView {
 					mTiles.add(tile);
 				}
 
-				newTiles.tiles[tiles++] = tile;
+				mCurrentTiles.tiles[tiles++] = tile;
 
-				if (prefetchChildren) {
+				if (!fetchProxy && !(tile.isLoading || tile.newData || tile.isReady)) {
-
-				}
-
-				if (!(tile.isLoading || tile.newData || tile.isReady)) {
 					mJobList.add(tile);
 				}
 
-				if (zdir > 0 && zoomLevel > 0) {
+				if (fetchChildren) {
+					byte z = (byte) (zoomLevel + 1);
+					for (int i = 0; i < 4; i++) {
+						int cx = (xx << 1) + (i % 2);
+						int cy = (yy << 1) + (i >> 1);
+
+						MapTile c = QuadTree.getTile(cx, cy, z);
+
+						if (c == null) {
+							c = new MapTile(cx, cy, z);
+
+							QuadTree.add(c);
+							mTiles.add(c);
+						}
+
+						if (!(c.isLoading || c.newData || c.isReady)) {
+							mJobList.add(c);
+						}
+					}
+				}
+
+				if (fetchParent || (!fetchProxy && zdir > 0 && zoomLevel > 0)) {
 					// prefetch parent
 					MapTile parent = tile.rel.parent.tile;
 
@@ -275,8 +325,8 @@ public class MapRenderer extends GLSurfaceView {
 		}
 
 		// pass new tile list to glThread
-		newTiles.cnt = tiles;
+		mCurrentTiles.cnt = tiles;
-		newTiles = GLRenderer.updateTiles(mapPosition, newTiles);
+		mCurrentTiles = GLRenderer.updateTiles(mapPosition, mCurrentTiles);
 
 		// note: this sets isLoading == true for all job tiles
 		if (mJobList.size() > 0) {
@@ -284,8 +334,6 @@ public class MapRenderer extends GLSurfaceView {
 			Collections.sort(mJobList);
 			mMapView.addJobs(mJobList);
 		}
-
-		return true;
 	}
 
 	private static void clearTile(MapTile t) {
@@ -311,10 +359,6 @@ public class MapRenderer extends GLSurfaceView {
 		QuadTree.remove(t);
 	}
 
-	// private static boolean tileInUse(MapTile t) {
-	// return (t.isActive || t.refs != 0);
-	// }
-
 	private static void updateTileDistances(ArrayList<?> tiles,
 			MapPosition mapPosition) {
 		int h = (Tile.TILE_SIZE >> 1);
@@ -335,7 +379,8 @@ public class MapRenderer extends GLSurfaceView {
 			if (diff == 0) {
 				dx = (t.pixelX + h) - x;
 				dy = (t.pixelY + h) - y;
-				// t.distance = ((dx > 0 ? dx : -dx) + (dy > 0 ? dy : -dy)) * 0.25f;
+				// t.distance = ((dx > 0 ? dx : -dx) + (dy > 0 ? dy : -dy)) *
+				// 0.25f;
 				t.distance = FloatMath.sqrt((dx * dx + dy * dy)) * 0.25f;
 			} else if (diff > 0) {
 				// tile zoom level is child of current
@@ -356,7 +401,8 @@ public class MapRenderer extends GLSurfaceView {
 				dx = ((t.pixelX + h) << -diff) - x;
 				dy = ((t.pixelY + h) << -diff) - y;
 
-				// t.distance = ((dx > 0 ? dx : -dx) + (dy > 0 ? dy : -dy)) * (-diff * 0.5f);
+				// t.distance = ((dx > 0 ? dx : -dx) + (dy > 0 ? dy : -dy)) *
+				// (-diff * 0.5f);
 				t.distance = FloatMath.sqrt((dx * dx + dy * dy)) * (-diff * 0.5f);
 			}
 		}
@@ -455,7 +501,8 @@ public class MapRenderer extends GLSurfaceView {
 					}
 
 					if (t.isLocked()) {
-						// Log.d(TAG, "keep unused tile data: " + t + " " + t.isActive);
+						// Log.d(TAG, "keep unused tile data: " + t + " " +
+						// t.isActive);
 						i++;
 						continue;
 					}
@@ -480,7 +527,8 @@ public class MapRenderer extends GLSurfaceView {
 		MapTile tile = (MapTile) jobTile;
 
 		if (!tile.isLoading) {
-			// no one should be able to use this tile now, mapgenerator passed it,
+			// no one should be able to use this tile now, mapgenerator passed
+			// it,
 			// glthread does nothing until newdata is set.
 			Log.d(TAG, "passTile: canceled " + tile);
 			synchronized (mTilesLoaded) {

src/org/oscim/view/renderer/TileGenerator.java

@@ -246,7 +246,8 @@ public class TileGenerator implements IRenderCallback, IMapDatabaseCallback {
 
 	@Override
 	public void renderPointOfInterestCaption(Caption caption) {
-		// Log.d(TAG, "renderPointOfInterestCaption: " + mPoiX + " " + mPoiY + " "
+		// Log.d(TAG, "renderPointOfInterestCaption: " + mPoiX + " " + mPoiY +
+		// " "
 		// + mTagName);
 
 		if (mTagName == null)
@@ -266,7 +267,7 @@ public class TileGenerator implements IRenderCallback, IMapDatabaseCallback {
 		if (mTagName == null)
 			return;
 
-		if (pathText.textKey == mTagEmptyName.key) {
+		if (pathText.textKey == mTagEmptyName.key && mTagName.value != null) {
 
 			mLabels = WayDecorator.renderText(mCoords, mTagName.value, pathText, 0,
 					mIndices[0], mLabels);
@@ -509,7 +510,8 @@ public class TileGenerator implements IRenderCallback, IMapDatabaseCallback {
 	 * Sets the scale stroke factor for the given zoom level.
 	 * 
 	 * @param zoomLevel
-	 *            the zoom level for which the scale stroke factor should be set.
+	 *            the zoom level for which the scale stroke factor should be
+	 *            set.
 	 */
 	private void setScaleStrokeWidth(byte zoomLevel) {
 		int zoomLevelDiff = Math.max(zoomLevel - STROKE_MIN_ZOOM_LEVEL, 0);