TiledMapRenderer.h

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#ifndef OSMSCOUT_CLIENT_QT_TILEDMAPRENDERER_H
#define OSMSCOUT_CLIENT_QT_TILEDMAPRENDERER_H
 
/*
 OSMScout - a Qt backend for libosmscout and libosmscout-map
 Copyright (C) 2010  Tim Teulings
 Copyright (C) 2017 Lukas Karas
 
  This library 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 2.1 of the License, or (at your option) any later version.
 
  This library 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 library; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
 */
 
#include <QObject>
#include <QSettings>
 
#include <osmscoutmap/DataTileCache.h>
 
#include <osmscoutclient/DBThread.h>
 
#include <osmscoutclientqt/MapRenderer.h>
#include <osmscoutclientqt/TileCache.h>
#include <osmscoutclientqt/OsmTileDownloader.h>
 
#include <osmscoutclientqt/ClientQtImportExport.h>
 
#include <atomic>
 
namespace osmscout {
 
class OSMSCOUT_CLIENT_QT_API TiledMapRenderer : public MapRenderer {
  Q_OBJECT
 
private:
  QString                       tileCacheDirectory;
 
  // tile caches
  // Rendered tile is combined from both sources.
  //
  // Online cache may contain NULL images (QImage::isNull() is true) for areas
  // covered by offline db and offline cache can contain NULL images
  // for areas not covered by db.
  //
  // When offlineTileCache is invalidated, cache keeps unchanged,
  // just its epoch is increased. When there is retrieved pixmap with
  // old epoch from cache, it is used, but rendering request is triggered.
  //
  // Offline tiles should be in ARGB format on db area interface.
  mutable QMutex                tileCacheMutex;
  TileCache                     onlineTileCache;
  TileCache                     offlineTileCache;
 
  OsmTileDownloader             *tileDownloader=nullptr;
 
  std::atomic_bool              onlineTilesEnabled;
  std::atomic_bool              offlineTilesEnabled;
 
  int                           screenWidth;
  int                           screenHeight;
 
  // data loading request
  DBLoadJob                     *loadJob=nullptr;
  uint32_t                      loadXFrom;
  uint32_t                      loadXTo;
  uint32_t                      loadYFrom;
  uint32_t                      loadYTo;
  MagnificationLevel            loadZ;
  size_t                        loadEpoch; // guarded by lock
 
  QColor                        unknownColor;
  QColor                        tileGridColor;
 
  Slot<OnlineTileProvider> onlineTileProviderSlot{ std::bind(&TiledMapRenderer::onlineTileProviderSignal, this, std::placeholders::_1) };
  Slot<bool> onlineTileEnabledSlot{ std::bind(&TiledMapRenderer::onlineTilesEnabledSignal, this, std::placeholders::_1) };
  Slot<bool> offlineMapChangedSlot{ std::bind(&TiledMapRenderer::offlineMapChangedSignal, this, std::placeholders::_1) };
 
signals:
  void onlineTileProviderSignal(OnlineTileProvider provider);
  void onlineTilesEnabledSignal(bool);
  void offlineMapChangedSignal(bool);
 
public slots:
  virtual void Initialize();
  virtual void InvalidateVisualCache();
  virtual void onStylesheetFilenameChanged();
  virtual void onDatabaseLoaded(osmscout::GeoBox boundingBox);
 
  void onlineTileRequest(uint32_t zoomLevel, uint32_t xtile, uint32_t ytile);
  void offlineTileRequest(uint32_t zoomLevel, uint32_t xtile, uint32_t ytile);
  void tileDownloaded(uint32_t zoomLevel, uint32_t x, uint32_t y, QImage image, QByteArray downloadedData);
  void tileDownloadFailed(uint32_t zoomLevel, uint32_t x, uint32_t y, bool zoomLevelOutOfRange);
  void onLoadJobFinished(QMap<QString,QMap<osmscout::TileKey,osmscout::TileRef>>);
 
  void onlineTileProviderChanged(const OnlineTileProvider &);
  void onlineTilesEnabledChanged(bool);
 
  void onOfflineMapChanged(bool);
 
private:
 
  DatabaseCoverage databaseCoverageOfTile(uint32_t zoomLevel, uint32_t xtile, uint32_t ytile);
 
public:
  TiledMapRenderer(QThread *thread,
                   SettingsRef settings,
                   DBThreadRef dbThread,
                   QString iconDirectory,
                   QString tileCacheDirectory,
                   size_t onlineTileCacheSize,
                   size_t offlineTileCacheSize);
 
  virtual ~TiledMapRenderer();

  virtual bool RenderMap(QPainter& painter,
                         const MapViewStruct& request);
};
 
}
 
#endif /* OSMSCOUT_CLIENT_QT_TILEDMAPRENDERER_H */