kernels.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 KernelType : int
{
  BIWEIGHT,      
  CUBIC_PULSE,   
  CONE,          
  CONE_SMOOTH,   
  DISK,          
  LORENTZIAN,    
  SMOOTH_COSINE, 
  SQUARE,        
  TRICUBE        
};
 
Array biweight(Vec2<int> shape);
 
Array blackman(Vec2<int> shape);
 
Array cone(Vec2<int> shape);
 
Array cone_talus(float height, float talus);
 
Array cone_smooth(Vec2<int> shape);
 
Array cubic_pulse(Vec2<int> shape);
 
std::vector<float> cubic_pulse_1d(int nk);
 
Array cubic_pulse_directional(Vec2<int> shape,
                              float     angle,
                              float     aspect_ratio,
                              float     anisotropy);
 
Array cubic_pulse_truncated(Vec2<int> shape, float slant_ratio, float angle);
 
Array disk(Vec2<int> shape);
 
Array disk_smooth(Vec2<int> shape, float r_cutoff = 0.9f);
 
Array gabor(Vec2<int> shape,
            float     kw,
            float     angle,
            bool      quad_phase_shift = false);
 
Array gabor_dune(Vec2<int> shape,
                 float     kw,
                 float     angle,
                 float     xtop,
                 float     xbottom);
 
Array get_kernel(Vec2<int> shape, KernelType kernel_type);
 
Array hann(Vec2<int> shape);
 
Array lorentzian(Vec2<int> shape, float footprint_threshold = 0.1f);
 
Array lorentzian_compact(Vec2<int> shape);
 
Array sinc_radial(Vec2<int> shape, float kw);
 
Array sinc_separable(Vec2<int> shape, float kw);
 
Array smooth_cosine(Vec2<int> shape);
 
Array square(Vec2<int> shape);
 
Array tricube(Vec2<int> shape);
 
} // namespace hmap