GenOptimizeWaysLowZoom.h

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#ifndef OSMSCOUT_IMPORT_GENOPTIMIZEWAYSLOWZOOM_H
#define OSMSCOUT_IMPORT_GENOPTIMIZEWAYSLOWZOOM_H

/*
  This source is part of the libosmscout library
  Copyright (C) 2011  Tim Teulings

  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 <osmscout/import/ImportFeatures.h>

#include <list>
#include <set>
#include <unordered_map>
#include <vector>

#include <osmscout/import/Import.h>

#include <osmscout/Area.h>
#include <osmscout/Way.h>

#include <osmscout/util/FileScanner.h>
#include <osmscout/util/FileWriter.h>

#include <osmscout/system/Compiler.h>

namespace osmscout {

  class OptimizeWaysLowZoomGenerator CLASS_FINAL : public ImportModule
  {
  private:
    typedef std::unordered_map<FileOffset,FileOffset> FileOffsetFileOffsetMap;

    struct TypeData
    {
      TypeInfoRef        type;            
      MagnificationLevel optLevel;        
      MagnificationLevel indexLevel;      

      uint32_t           cellXStart;
      uint32_t           cellXEnd;
      uint32_t           cellYStart;
      uint32_t           cellYEnd;

      FileOffset         bitmapOffset;    
      uint8_t            dataOffsetBytes; 

      uint32_t           cellXCount;
      uint32_t           cellYCount;

      size_t             indexCells;      
      size_t             indexEntries;    

      TypeData();

      inline bool HasEntries()
      {
        return indexCells>0 &&
               indexEntries>0;
      }
    };

  private:
    void GetWayTypesToOptimize(const TypeConfig& typeConfig,
                               std::set<TypeInfoRef>& types);

    bool WriteTypeData(FileWriter& writer,
                       const TypeData& data);

    bool WriteHeader(FileWriter& writer,
                     const std::list<TypeData>& wayTypesData,
                     MagnificationLevel optimizeMaxMap);

    bool GetWays(const TypeConfig& typeConfig,
                 const ImportParameter& parameter,
                 Progress& progress,
                 FileScanner& scanner,
                 std::set<TypeInfoRef>& types,
                 std::vector<std::list<WayRef> >& ways);

    void MergeWays(Progress& progress,
                   const std::list<WayRef>& ways,
                   std::list<WayRef>& newWays);

    void GetWayIndexLevel(const ImportParameter& parameter,
                          const std::list<WayRef>& ways,
                          TypeData& typeData);

    void OptimizeWays(Progress& progress,
                      const std::list<WayRef>& ways,
                      std::list<WayRef>& optimizedWays,
                      size_t width,
                      size_t height,
                      double dpi,
                      double pixel,
                      const Magnification& magnification,
                      TransPolygon::OptimizeMethod optimizeWayMethod);

    void WriteWays(const TypeConfig& typeConfig,
                   FileWriter& writer,
                   const std::list<WayRef>& ways,
                   FileOffsetFileOffsetMap& offsets);

    bool WriteWayBitmap(Progress& progress,
                        FileWriter& writer,
                        const std::list<WayRef>& ways,
                        const FileOffsetFileOffsetMap& offsets,
                        TypeData& data);

    bool HandleWays(const ImportParameter& parameter,
                    Progress& progress,
                    const TypeConfig& typeConfig,
                    FileWriter& writer,
                    const std::set<TypeInfoRef>& types,
                    std::list<TypeData>& typesData);

  public:
    void GetDescription(const ImportParameter& parameter,
                        ImportModuleDescription& description) const override;

    bool Import(const TypeConfigRef& typeConfig,
                const ImportParameter& parameter,
                Progress& progress) override;
  };
}

#endif