pyramid.hpp

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/* Copyright (c) 2023 Otto Link. Distributed under the terms of the GNU General
   Public License. The full license is in the file LICENSE, distributed with
   this software. */
 
#pragma once
 
#include <functional>
 
#include "highmap/array.hpp"
 
namespace hmap
{
 
enum pyramid_transform_support : int
{
  FULL,         
  LOWPASS_ONLY, 
  HIGHPASS_ONLY 
};
 
class PyramidDecomposition
{
public:
  int nlevels;
 
  Array residual;
 
  std::vector<Array> components = {};
 
  std::function<Array(const Array &)> low_pass_filter_function;
 
  PyramidDecomposition(Array &array, int nlevels);
 
  void decompose();
 
  Array reconstruct();
 
  void to_png(std::string fname, int cmap, bool hillshading = false);
 
  Array transform(
      std::function<Array(const Array &, const int current_level)> function,
      int                                                          support = 0,
      std::vector<float> level_weights = {},
      int                finest_level = 0);
 
private:
  Array *p_array = nullptr;
};
 
} // namespace hmap