content: /*
   * Copyright 2012 Hannes Janetzek
   *
   * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
   *
   * This program is free software: you can redistribute it and/or modify it under the
   * terms of the GNU Lesser General Public License as published by the Free Software
   * Foundation, either version 3 of the License, or (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful, but WITHOUT ANY
   * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public License along with
   * this program. If not, see <http://www.gnu.org/licenses/>.
   */
  
  package org.oscim.layers.tile.vector.labeling;
  
  // TODO
  // 1. rewrite. seriously
  // 1.1 test if label is actually visible
  // 2. compare previous to current state
  // 2.1 test for new labels to be placed
  // 2.2 handle collisions
  // 2.3 try to place labels along a way
  // 2.4 use 4 point labeling
  // 3 join segments that belong to one feature
  // 4 handle zoom-level changes
  // 5 QuadTree might be handy
  //
  
  import org.oscim.layers.tile.vector.labeling.LabelLayer.Worker;
  import org.oscim.renderer.BucketRenderer;
  import org.oscim.renderer.GLState;
  import org.oscim.renderer.GLViewport;
  import org.oscim.renderer.bucket.RenderBucket;
  import org.oscim.renderer.bucket.TextureBucket;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  class TextRenderer extends BucketRenderer {
      static final Logger log = LoggerFactory.getLogger(TextRenderer.class);
      static final boolean dbg = false;
  
      private final Worker mWorker;
  
      public TextRenderer(Worker worker) {
          mWorker = worker;
      }
  
      long lastDraw = 0;
  
      @Override
      public synchronized void update(GLViewport v) {
  
          LabelTask t;
          synchronized (mWorker) {
              t = mWorker.poll();
              if (t == null) {
                  if (!mWorker.isRunning()) {
                      mWorker.submit(50);
                  }
                  return;
              }
              buckets.clear();
          }
  
          // set new TextLayer to be uploaded and rendered
          buckets.set(t.layers);
          mMapPosition = t.pos;
          compile();
      }
  
      @Override
      public synchronized void render(GLViewport v) {
          GLState.test(false, false);
          //Debug.draw(pos, layers);
  
          buckets.vbo.bind();
  
          float scale = (float) (v.pos.scale / mMapPosition.scale);
  
          setMatrix(v, false);
  
          for (RenderBucket l = buckets.get(); l != null; )
              l = TextureBucket.Renderer.draw(l, v, scale);
      }
  
  }
  