Class SrtmTile

generator/srtm_parser.hpp:20–66

namespace generator
{
class SrtmTile
{
public:
  SrtmTile() : m_valid(false) {}
  SrtmTile(SrtmTile && rhs);

  void Init(std::string const & dir, ms::LatLon const & coord);

  inline bool IsValid() const { return m_valid; }
  /// @return Height in meters at |coord| or kInvalidAltitude.
  /// @{
  /// Nearest serialized height.
  geometry::Altitude GetHeight(ms::LatLon const & coord) const;
  /// Triangle interpolation.
  double GetTriangleHeight(ms::LatLon const & coord) const;
  /// Bilinear interpolation.
  double GetBilinearHeight(ms::LatLon const & coord) const;

  geometry::Altitude GetAltitude(ms::LatLon const & coord) const
  {
    return static_cast<geometry::Altitude>(std::round(GetBilinearHeight(coord)));
  }
  /// @}

  using LatLonKey = std::pair<int32_t, int32_t>;
  static LatLonKey GetKey(ms::LatLon const & coord);

  static std::string GetBase(ms::LatLon const & coord);
  static std::string GetPath(std::string const & dir, std::string const & base);

  /// Used in unit tests only to prepare mock tile.
  geometry::Altitude * DataForTests(size_t & sz);

private:
  static ms::LatLon GetCoordInSeconds(ms::LatLon const & coord);
  geometry::Altitude GetHeightRC(size_t row, size_t col) const;

  inline geometry::Altitude const * Data() const { return reinterpret_cast<geometry::Altitude const *>(m_data.data()); }

  inline size_t Size() const { return m_data.size() / sizeof(geometry::Altitude); }
  void Invalidate();

  std::vector<uint8_t> m_data;
  bool m_valid;

  DISALLOW_COPY(SrtmTile);
};

class SrtmTileManager
{