tiff_grayscale.hh

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#ifndef DUNE_COPASI_TIFF_GRAYSCALE_HH
#define DUNE_COPASI_TIFF_GRAYSCALE_HH
 
#include <dune/copasi/common/tiff_file.hh>
 
#include <function2/function2.hpp>
 
#include <filesystem>
#include <functional>
#include <queue>
 
namespace Dune::Copasi {
 
class TIFFGrayscale
{
  struct TIFFGrayscaleRow
  {
    TIFFGrayscaleRow(const TIFFFile& tiff, const std::size_t& row);
    [[nodiscard]] double operator[](const std::size_t& col) const;
 
    [[nodiscard]] std::size_t size() const;
 
    [[nodiscard]] std::size_t row() const;
 
  private:
    TIFFFile const* _tiff_ptr;
    std::size_t _row;
    std::size_t _max;
    fu2::unique_function<std::size_t(std::size_t) const noexcept>
      _read_col{};
  };
 
public:
  explicit TIFFGrayscale(const std::filesystem::path& filename, std::size_t max_cache = 8);
 
  const TIFFGrayscaleRow& operator[](std::size_t row) const;
 
  [[nodiscard]] double operator()(double pos_x, double pos_y) noexcept;
 
  [[nodiscard]] std::size_t size() const;
 
  [[nodiscard]] std::size_t rows() const;
 
  [[nodiscard]] std::size_t cols() const;
 
private:
  const TIFFGrayscaleRow& cache(std::size_t row) const;
 
  TIFFFile _tiff;
  mutable std::deque<TIFFGrayscaleRow> _row_cache;
  std::size_t _max_cache;
};
 
} // namespace Dune::Copasi
 
#endif // DUNE_COPASI_TIFF_GRAYSCALE_HH