// Filename: pfmFile.h
// Created by:  drose (23Dec10)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) Carnegie Mellon University.  All rights reserved.
//
// All use of this software is subject to the terms of the revised BSD
// license.  You should have received a copy of this license along
// with this source code in a file named "LICENSE."
//
////////////////////////////////////////////////////////////////////

#ifndef PFMFILE_H
#define PFMFILE_H

#include "pandatoolbase.h"
#include "luse.h"
#include "nodePath.h"
#include "boundingHexahedron.h"

////////////////////////////////////////////////////////////////////
//       Class : PfmFile
// Description : Defines a pfm file, a 2-d table of floating-point
//               numbers, either 3-component or 1-component.
////////////////////////////////////////////////////////////////////
class PfmFile {
public:
  PfmFile();
  PfmFile(const PfmFile &copy);
  void operator = (const PfmFile &copy);

  void clear();

  bool read(const Filename &fullpath);
  bool read(istream &in);
  bool write(const Filename &fullpath);
  bool write(ostream &out);

  INLINE bool is_valid() const;

  INLINE int get_x_size() const;
  INLINE int get_y_size() const;
  INLINE float get_scale() const;
  INLINE int get_num_channels() const;

  INLINE const LPoint3f &get_point(int x, int y) const;
  INLINE LPoint3f &modify_point(int x, int y);

  INLINE void set_zero_special(bool zero_special);
  INLINE bool get_zero_special() const;

  void resize(int new_x_size, int new_y_size);
  void reverse_rows();
  void xform(const LMatrix4f &transform);

  PT(BoundingHexahedron) compute_planar_bounds(double point_dist, double sample_radius) const;
  
  NodePath generate_vis_points() const;
  NodePath generate_vis_mesh() const;

private:
  PT(Geom) make_vis_mesh_geom(bool inverted) const;

  void compute_sample_point(LPoint3f &result,
                            double x, double y, double sample_radius) const;
  void box_filter_region(LPoint3f &result,
                         double x0, double y0, double x1, double y1) const;
  void box_filter_line(LPoint3f &result, double &coverage,
                       double x0, int y, double x1, double y_contrib) const;
  void box_filter_point(LPoint3f &result, double &coverage,
                        int x, int y, double x_contrib, double y_contrib) const;


private:
  typedef pvector<LPoint3f> Table;
  Table _table;

  int _x_size;
  int _y_size;
  float _scale;
  int _num_channels;

  bool _zero_special;
};

#include "pfmFile.I"

#endif