public void applyAndSync(
     Bbox bounds, TileFunction<RasterTile> onDelete, TileFunction<RasterTile> onUpdate) {
   MapViewState viewState = rasterLayer.getMapModel().getMapView().getViewState();
   boolean panning = lastViewState == null || viewState.isPannableFrom(lastViewState);
   if (!panning || isDirty()) {
     for (RasterTile tile : tiles.values()) {
       onDelete.execute(tile);
     }
     tiles.clear();
     tileBounds = null;
     dirty = false;
   }
   lastViewState = rasterLayer.getMapModel().getMapView().getViewState();
   if (tileBounds == null || !tileBounds.contains(bounds)) {
     fetchAndUpdateTiles(bounds, onUpdate);
   } else {
     updateTiles(bounds, onUpdate);
   }
 }
 private void addTiles(List<org.geomajas.layer.tile.RasterTile> images) {
   Matrix t = rasterLayer.getMapModel().getMapView().getWorldToPanTranslation();
   Bbox cacheBounds = null;
   // flag and reference tile to realign the grid when new tiles come in (transformation shift!)
   boolean newTiles = false;
   RasterTile referenceTile = null;
   for (org.geomajas.layer.tile.RasterTile image : images) {
     TileCode code = image.getCode().clone();
     if (!tiles.containsKey(code)) {
       Bbox panBounds = new Bbox(image.getBounds());
       panBounds.translate(Math.round(t.getDx()), Math.round(t.getDy()));
       if (cacheBounds == null) {
         cacheBounds = panBounds;
       } else {
         cacheBounds = cacheBounds.union(panBounds);
       }
       RasterTile tile = new RasterTile(code, panBounds, image.getUrl(), this);
       tiles.put(code, tile);
       newTiles = true;
       referenceTile = tile;
     }
   }
   // This realigns the grid of tiles based on their code
   if (newTiles) {
     for (RasterTile tile : tiles.values()) {
       if (!tile.getCode().equals(referenceTile.getCode())) {
         Bbox aligned = new Bbox(referenceTile.getBounds());
         aligned.setX(
             referenceTile.getBounds().getX()
                 + (tile.getCode().getX() - referenceTile.getCode().getX()) * aligned.getWidth());
         if (tile.getCode().getY() != referenceTile.getCode().getY()) {
           aligned.setY(
               referenceTile.getBounds().getY()
                   + getOrientedJDiff(referenceTile, tile) * aligned.getHeight());
         }
         tile.setBounds(aligned);
       }
     }
   }
 }
 private Bbox worldToPan(Bbox bounds) {
   Matrix t = rasterLayer.getMapModel().getMapView().getWorldToPanTransformation();
   return bounds.transform(t);
 }