nlmeans_core.h

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/*
    This file is part of darktable,
    Copyright (C) 2020 Ralf Brown.
    Copyright (C) 2022 Martin Bařinka.
    Copyright (C) 2025 Aurélien PIERRE.
    
    darktable is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
    
    darktable is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
    
    You should have received a copy of the GNU General Public License
    along with darktable.  If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
 
#include "iop/iop_api.h"
#include "develop/develop.h"
 
struct dt_nlmeans_param_t
{
  float scattering; // scattering factor for patches (default 0 = densest possible)
  float scale;    // image scaling, affects scattering
  float luma;   // blend amount, L channel in Lab (set to 1.00 for RGB)
  float chroma;   // blend amount, a/b channels (set to 1.00 for RBG)
  float center_weight;  // weighting of central pixel in patch (<0 for no special handling; used by denoise[non-local])
  float sharpness;  // relative weight of central pixel (preserves detail), ignored if center_weight >= 0
  int patch_radius; // radius of patches which are compared, 1..4
  int search_radius;  // radius around a pixel in which to compare patches (default = 7)
  int decimate;         // set to 1 to search only half the patches in the neighborhood (default = 0)
  const float* const norm; // array of four per-channel weight factors
  dt_dev_pixelpipe_type_t pipetype;
  int kernel_init;  // CL: initialization (runs once)
  int kernel_dist;  // CL: compute channel-normed squared pixel differences (runs for each patch)
  int kernel_horiz; // CL: horizontal sum (runs for each patch)
  int kernel_vert;  // CL: vertical sum (runs for each patch)
  int kernel_accu;  // CL: add to output pixel (runs for each patch)
};
typedef struct dt_nlmeans_param_t dt_nlmeans_param_t;
 
void nlmeans_denoise(const float *const inbuf, float *const outbuf,
                     const dt_iop_roi_t *const roi_in, const dt_iop_roi_t *const roi_out,
                     const dt_nlmeans_param_t *const params);
 
void nlmeans_denoise_sse2(const float *const inbuf, float *const outbuf,
                          const dt_iop_roi_t *const roi_in, const dt_iop_roi_t *const roi_out,
                          const dt_nlmeans_param_t *const params);
 
#ifdef HAVE_OPENCL
int nlmeans_denoise_cl(const dt_nlmeans_param_t *const params, const int devid,
                       cl_mem dev_in, cl_mem dev_out, const dt_iop_roi_t *const roi_in);
int nlmeans_denoiseprofile_cl(const dt_nlmeans_param_t *const params, const int devid,
                              cl_mem dev_in, cl_mem dev_out, const dt_iop_roi_t *const roi_in);
#endif /* HAVE_OPENCL */
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