nlmeans.c

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/*
    This file is part of darktable,
    Copyright (C) 2010-2011 Bruce Guenter.
    Copyright (C) 2010-2013, 2016 johannes hanika.
    Copyright (C) 2011 Henrik Andersson.
    Copyright (C) 2011 Kanstantsin Shautsou.
    Copyright (C) 2011 Pascal de Bruijn.
    Copyright (C) 2011 Robert Bieber.
    Copyright (C) 2011-2014, 2016, 2019 Tobias Ellinghaus.
    Copyright (C) 2011-2014, 2016-2017 Ulrich Pegelow.
    Copyright (C) 2012 Richard Wonka.
    Copyright (C) 2013 Edouard Gomez.
    Copyright (C) 2014-2016 Roman Lebedev.
    Copyright (C) 2015 Pedro Côrte-Real.
    Copyright (C) 2017 Heiko Bauke.
    Copyright (C) 2018, 2020, 2023, 2025-2026 Aurélien PIERRE.
    Copyright (C) 2018 Edgardo Hoszowski.
    Copyright (C) 2018 Maurizio Paglia.
    Copyright (C) 2018, 2020, 2022 Pascal Obry.
    Copyright (C) 2018-2019 rawfiner.
    Copyright (C) 2019 Andreas Schneider.
    Copyright (C) 2019 Diederik ter Rahe.
    Copyright (C) 2020 Aldric Renaudin.
    Copyright (C) 2020, 2022 Diederik Ter Rahe.
    Copyright (C) 2020 Hubert Kowalski.
    Copyright (C) 2020-2021 Ralf Brown.
    Copyright (C) 2022 Hanno Schwalm.
    Copyright (C) 2022 Martin Bařinka.
    Copyright (C) 2022 Philipp Lutz.
    Copyright (C) 2026 Guillaume Stutin.
    
    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/>.
*/
#ifdef HAVE_CONFIG_H
#include "system/macros.h"
#include "system/mem_alloc.h"
#include "common/module_versioning.h"
#include "common/logging.h"
#include "system/simd.h"
#include "config.h"
#endif
#include "widgets/bauhaus.h"
#include "pixel/nlmeans_core.h"
#include "common/opencl.h"
#include "develop/imageop.h"
#include "develop/imageop_math.h"
#include "develop/imageop_gui.h"
#include "develop/tiling.h"
 
#include "iop/iop_api.h"
#include <gtk/gtk.h>
#include <stdlib.h>
 
// which version of the non-local means code should be used?  0=old (this file), 1=new (src/common/nlmeans_core.c)
#define USE_NEW_IMPL_CL 0
 
// number of intermediate buffers used by OpenCL code path.  Needs to match value in src/common/nlmeans_core.c
//   to correctly compute tiling
#define NUM_BUCKETS 4
 
// this is the version of the modules parameters,
// and includes version information about compile-time dt
DT_MODULE_INTROSPECTION(2, dt_iop_nlmeans_params_t)
 
typedef struct dt_iop_nlmeans_params_v1_t
{
  float luma;
  float chroma;
} dt_iop_nlmeans_params_v1_t;
 
typedef struct dt_iop_nlmeans_params_t
{
  // these are stored in db.
  float radius;   // $MIN: 0.0 $MAX: 10.0 $DEFAULT: 2.0 $DESCRIPTION: "patch size"
  float strength; // $MIN: 0.0 $MAX: 100000.0 $DEFAULT: 50.0
  float luma;     // $MIN: 0.0 $MAX: 1.0 $DEFAULT: 0.5
  float chroma;   // $MIN: 0.0 $MAX: 1.0 $DEFAULT: 1.0
} dt_iop_nlmeans_params_t;
 
typedef struct dt_iop_nlmeans_gui_data_t
{
  GtkWidget *radius;
  GtkWidget *strength;
  GtkWidget *luma;
  GtkWidget *chroma;
} dt_iop_nlmeans_gui_data_t;
 
typedef dt_iop_nlmeans_params_t dt_iop_nlmeans_data_t;
 
typedef struct dt_iop_nlmeans_global_data_t
{
  int kernel_nlmeans_init;
  int kernel_nlmeans_dist;
  int kernel_nlmeans_horiz;
  int kernel_nlmeans_vert;
  int kernel_nlmeans_accu;
  int kernel_nlmeans_finish;
} dt_iop_nlmeans_global_data_t;
 
 
const char *name()
{
  return _("astrophoto denoise");
}
 
const char *aliases()
{
  return _("denoise (non-local means)");
}
 
const char **description(struct dt_iop_module_t *self)
{
  return dt_iop_set_description(self, _("apply a poisson noise removal best suited for astrophotography"),
                                      _("corrective"),
                                      _("non-linear, Lab, display-referred"),
                                      _("non-linear, Lab"),
                                      _("non-linear, Lab, display-referred"));
}
 
int default_colorspace(dt_iop_module_t *self, dt_dev_pixelpipe_t *pipe, const dt_dev_pixelpipe_iop_t *piece)
{
  return IOP_CS_LAB;
}
 
int legacy_params(dt_iop_module_t *self, const void *const old_params, const int old_version,
                  void *new_params, const int new_version)
{
  if(old_version == 1 && new_version == 2)
  {
    dt_iop_nlmeans_params_v1_t *o = (dt_iop_nlmeans_params_v1_t *)old_params;
    dt_iop_nlmeans_params_t *n = (dt_iop_nlmeans_params_t *)new_params;
    n->luma = o->luma;
    n->chroma = o->chroma;
    n->strength = 100.0f;
    n->radius = 3;
    return 0;
  }
  return 1;
}
 
int default_group()
{
  return IOP_GROUP_REPAIR;
}
 
int flags()
{
  return IOP_FLAGS_SUPPORTS_BLENDING | IOP_FLAGS_ALLOW_TILING;
}
 
#if defined(HAVE_OPENCL) && !USE_NEW_IMPL_CL
static int bucket_next(unsigned int *state, unsigned int max)
{
  unsigned int current = *state;
  unsigned int next = (current >= max - 1 ? 0 : current + 1);
 
  *state = next;
 
  return next;
}
 
int process_cl(struct dt_iop_module_t *self, const dt_dev_pixelpipe_t *pipe, const dt_dev_pixelpipe_iop_t *piece, cl_mem dev_in, cl_mem dev_out)
{
  const dt_iop_roi_t *const roi_in = &piece->roi_in;
  dt_iop_nlmeans_params_t *d = (dt_iop_nlmeans_params_t *)piece->data;
  dt_iop_nlmeans_global_data_t *gd = (dt_iop_nlmeans_global_data_t *)self->global_data;
#if USE_NEW_IMPL_CL
  const int width = roi_in->width;
  const int height = roi_in->height;
 
  const float scale = fminf(roi_in->scale, 2.0f);
  const int P = ceilf(d->radius * scale); // pixel filter size
  const int K = ceilf(7 * scale);         // nbhood
  const float sharpness = 3000.0f / (1.0f + d->strength);
 
  // adjust to Lab, make L more important
  const float max_L = 120.0f, max_C = 512.0f;
  const float nL = 1.0f / max_L, nC = 1.0f / max_C;
  const float norm2[4] = { nL, nC }; //luma and chroma scaling factors
 
  // allocate a buffer to receive the denoised image
  const int devid = pipe->devid;
  cl_mem dev_U2 = dt_opencl_alloc_device_buffer(devid, sizeof(float) * 4 * width * height);
  if(IS_NULL_PTR(dev_U2))
  {
    dt_print(DT_DEBUG_OPENCL, "[opencl_nlmeans] couldn't allocate GPU buffer\n");
    return FALSE;
  }
 
  const dt_nlmeans_param_t params =
  {
    .scattering = 0,
    .scale = scale,
    .luma = d->luma,
    .chroma = d->chroma,
    .center_weight = -1,
    .sharpness = sharpness,
    .patch_radius = P,
    .search_radius = K,
    .decimate = 0,
    .norm = norm2,
    .pipe = pipe,
    .kernel_init = gd->kernel_nlmeans_init,
    .kernel_dist = gd->kernel_nlmeans_dist,
    .kernel_horiz = gd->kernel_nlmeans_horiz,
    .kernel_vert = gd->kernel_nlmeans_vert,
    .kernel_accu = gd->kernel_nlmeans_accu
  };
  cl_int err = nlmeans_denoise_cl(&params, devid, dev_in, dev_U2, roi_in);
  if (err == CL_SUCCESS)
  {
    // normalize and blend
    size_t sizes[] = { ROUNDUPDWD(width, devid), ROUNDUPDHT(height, devid), 1 };
    const float weight[4] = { d->luma, d->chroma, d->chroma, 1.0f };
    dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_finish, 0, sizeof(cl_mem), (void *)&dev_in);
    dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_finish, 1, sizeof(cl_mem), (void *)&dev_U2);
    dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_finish, 2, sizeof(cl_mem), (void *)&dev_out);
    dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_finish, 3, sizeof(int), (void *)&width);
    dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_finish, 4, sizeof(int), (void *)&height);
    dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_finish, 5, 4 * sizeof(float), (void *)&weight);
    err = dt_opencl_enqueue_kernel_2d(devid, gd->kernel_nlmeans_finish, sizes);
  }
  // clean up and check whether all kernels ran successfully
  dt_opencl_release_mem_object(dev_U2);
  if (err == CL_SUCCESS)
    return TRUE;
  dt_print(DT_DEBUG_OPENCL, "[opencl_nlmeans] couldn't enqueue kernel! %d\n", err);
  return FALSE;
 
#else // old code
  const int width = roi_in->width;
  const int height = roi_in->height;
 
  cl_int err = -999;
 
  const float scale = fminf(roi_in->scale, 2.0f);
  const int P = ceilf(d->radius * scale); // pixel filter size
  const int K = ceilf(7 * scale);         // nbhood
  const float sharpness = 3000.0f / (1.0f + d->strength);
 
  // adjust to Lab, make L more important
  const float max_L = 120.0f, max_C = 512.0f;
  const float nL = 1.0f / max_L, nC = 1.0f / max_C;
  const float nL2 = nL * nL, nC2 = nC * nC;
  const dt_aligned_pixel_t weight = { d->luma, d->chroma, d->chroma, 1.0f };
 
  const int devid = pipe->devid;
  cl_mem dev_U2 = dt_opencl_alloc_device_buffer(devid, sizeof(float) * 4 * width * height);
  if(IS_NULL_PTR(dev_U2)) goto error;
 
  cl_mem buckets[NUM_BUCKETS] = { NULL };
  unsigned int state = 0;
  for(int k = 0; k < NUM_BUCKETS; k++)
  {
    buckets[k] = dt_opencl_alloc_device_buffer(devid, sizeof(float) * width * height);
    if(buckets[k] == NULL) goto error;
  }
 
  int hblocksize;
  dt_opencl_local_buffer_t hlocopt
    = (dt_opencl_local_buffer_t){ .xoffset = 2 * P, .xfactor = 1, .yoffset = 0, .yfactor = 1,
                                  .cellsize = sizeof(float), .overhead = 0,
                                  .sizex = 1 << 16, .sizey = 1 };
 
  if(dt_opencl_local_buffer_opt(devid, gd->kernel_nlmeans_horiz, &hlocopt))
    hblocksize = hlocopt.sizex;
  else
    hblocksize = 1;
 
  int vblocksize;
  dt_opencl_local_buffer_t vlocopt
    = (dt_opencl_local_buffer_t){ .xoffset = 1, .xfactor = 1, .yoffset = 2 * P, .yfactor = 1,
                                  .cellsize = sizeof(float), .overhead = 0,
                                  .sizex = 1, .sizey = 1 << 16 };
 
  if(dt_opencl_local_buffer_opt(devid, gd->kernel_nlmeans_vert, &vlocopt))
    vblocksize = vlocopt.sizey;
  else
    vblocksize = 1;
 
 
  size_t sizesl[3];
  size_t local[3];
  size_t sizes[] = { ROUNDUPDWD(width, devid), ROUNDUPDHT(height, devid), 1 };
 
  dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_init, 0, sizeof(cl_mem), (void *)&dev_U2);
  dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_init, 1, sizeof(int), (void *)&width);
  dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_init, 2, sizeof(int), (void *)&height);
  err = dt_opencl_enqueue_kernel_2d(devid, gd->kernel_nlmeans_init, sizes);
  if(err != CL_SUCCESS) goto error;
 
 
  const size_t bwidth = ROUNDUP(width, hblocksize);
  const size_t bheight = ROUNDUP(height, vblocksize);
 
  for(int j = -K; j <= 0; j++)
    for(int i = -K; i <= K; i++)
    {
      // The pipe abandoned this run: stop between two patches. The host enqueues the whole run far
      // ahead of the device, so the killswitch is read once the previous patch has run on it.
      if((j > -K || i > -K) && dt_opencl_finish(devid) && dt_dev_pixelpipe_has_shutdown(pipe)) goto error;
 
      int q[2] = { i, j };
 
      cl_mem dev_U4 = buckets[bucket_next(&state, NUM_BUCKETS)];
      dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_dist, 0, sizeof(cl_mem), (void *)&dev_in);
      dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_dist, 1, sizeof(cl_mem), (void *)&dev_U4);
      dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_dist, 2, sizeof(int), (void *)&width);
      dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_dist, 3, sizeof(int), (void *)&height);
      dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_dist, 4, 2 * sizeof(int), (void *)&q);
      dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_dist, 5, sizeof(float), (void *)&nL2);
      dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_dist, 6, sizeof(float), (void *)&nC2);
      err = dt_opencl_enqueue_kernel_2d(devid, gd->kernel_nlmeans_dist, sizes);
      if(err != CL_SUCCESS) goto error;
 
      sizesl[0] = bwidth;
      sizesl[1] = ROUNDUPDHT(height, devid);
      sizesl[2] = 1;
      local[0] = hblocksize;
      local[1] = 1;
      local[2] = 1;
      cl_mem dev_U4_t = buckets[bucket_next(&state, NUM_BUCKETS)];
      dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_horiz, 0, sizeof(cl_mem), (void *)&dev_U4);
      dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_horiz, 1, sizeof(cl_mem), (void *)&dev_U4_t);
      dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_horiz, 2, sizeof(int), (void *)&width);
      dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_horiz, 3, sizeof(int), (void *)&height);
      dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_horiz, 4, 2 * sizeof(int), (void *)&q);
      dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_horiz, 5, sizeof(int), (void *)&P);
      dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_horiz, 6, (hblocksize + 2 * P) * sizeof(float), NULL);
      err = dt_opencl_enqueue_kernel_2d_with_local(devid, gd->kernel_nlmeans_horiz, sizesl, local);
      if(err != CL_SUCCESS) goto error;
 
 
      sizesl[0] = ROUNDUPDWD(width, devid);
      sizesl[1] = bheight;
      sizesl[2] = 1;
      local[0] = 1;
      local[1] = vblocksize;
      local[2] = 1;
      cl_mem dev_U4_tt = buckets[bucket_next(&state, NUM_BUCKETS)];
      dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_vert, 0, sizeof(cl_mem), (void *)&dev_U4_t);
      dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_vert, 1, sizeof(cl_mem), (void *)&dev_U4_tt);
      dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_vert, 2, sizeof(int), (void *)&width);
      dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_vert, 3, sizeof(int), (void *)&height);
      dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_vert, 4, 2 * sizeof(int), (void *)&q);
      dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_vert, 5, sizeof(int), (void *)&P);
      dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_vert, 6, sizeof(float), (void *)&sharpness);
      dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_vert, 7, (vblocksize + 2 * P) * sizeof(float), NULL);
      err = dt_opencl_enqueue_kernel_2d_with_local(devid, gd->kernel_nlmeans_vert, sizesl, local);
      if(err != CL_SUCCESS) goto error;
 
 
      dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_accu, 0, sizeof(cl_mem), (void *)&dev_in);
      dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_accu, 1, sizeof(cl_mem), (void *)&dev_U2);
      dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_accu, 2, sizeof(cl_mem), (void *)&dev_U4_tt);
      dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_accu, 3, sizeof(int), (void *)&width);
      dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_accu, 4, sizeof(int), (void *)&height);
      dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_accu, 5, 2 * sizeof(int), (void *)&q);
      err = dt_opencl_enqueue_kernel_2d(devid, gd->kernel_nlmeans_accu, sizes);
      if(err != CL_SUCCESS) goto error;
    }
 
  // normalize and blend
  dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_finish, 0, sizeof(cl_mem), (void *)&dev_in);
  dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_finish, 1, sizeof(cl_mem), (void *)&dev_U2);
  dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_finish, 2, sizeof(cl_mem), (void *)&dev_out);
  dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_finish, 3, sizeof(int), (void *)&width);
  dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_finish, 4, sizeof(int), (void *)&height);
  dt_opencl_set_kernel_arg(devid, gd->kernel_nlmeans_finish, 5, 4 * sizeof(float), (void *)&weight);
  err = dt_opencl_enqueue_kernel_2d(devid, gd->kernel_nlmeans_finish, sizes);
  if(err != CL_SUCCESS) goto error;
 
  dt_opencl_release_mem_object(dev_U2);
  for(int k = 0; k < NUM_BUCKETS; k++)
  {
    dt_opencl_release_mem_object(buckets[k]);
  }
  return TRUE;
 
error:
  dt_opencl_release_mem_object(dev_U2);
  for(int k = 0; k < NUM_BUCKETS; k++)
  {
    dt_opencl_release_mem_object(buckets[k]);
  }
 
  // an abandoned run comes here with the last patch's CL_SUCCESS: there is no error to report
  if(err != CL_SUCCESS) dt_print(DT_DEBUG_OPENCL, "[opencl_nlmeans] couldn't enqueue kernel! %d\n", err);
  return FALSE;
#endif /* USE_NEW_IMPL_CL */
}
#endif
 
 
void tiling_callback(struct dt_iop_module_t *self, const struct dt_dev_pixelpipe_t *pipe, const struct dt_dev_pixelpipe_iop_t *piece, struct dt_develop_tiling_t *tiling)
{
  const dt_iop_roi_t *const roi_in = &piece->roi_in;
  dt_iop_nlmeans_params_t *d = (dt_iop_nlmeans_params_t *)piece->data;
  const int P = ceilf(d->radius * fmin(roi_in->scale, 2.0f)); // pixel filter size
  const int K = ceilf(7 * fmin(roi_in->scale, 2.0f));         // nbhood
 
  tiling->factor = 2.0f + 1.0f + 0.25 * NUM_BUCKETS; // in + out + tmp
  tiling->maxbuf = 1.0f;
  tiling->overhead = 0;
  tiling->overlap = P + K;
  tiling->xalign = 1;
  tiling->yalign = 1;
  return;
}
 
static inline __attribute__((always_inline)) int process_cpu(const dt_dev_pixelpipe_t *pipe, const dt_dev_pixelpipe_iop_t *piece,
                        const void *const ivoid,
                        void *const ovoid, const dt_iop_roi_t *const roi_in,
                        const dt_iop_roi_t *const roi_out,
                        int (*denoiser)(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))
{
  // this is called for preview and full pipe separately, each with its own pixelpipe piece.
  // get our data struct:
  const dt_iop_nlmeans_params_t *const d = (dt_iop_nlmeans_params_t *)piece->data;
 
  // adjust to zoom size:
  const float scale = fmin(roi_in->scale, 2.0f);
  const int P = ceilf(d->radius * scale); // pixel filter size
  const int K = ceilf(7 * scale);         // nbhood
  const float sharpness = 3000.0f / (1.0f + d->strength);
 
  // adjust to Lab, make L more important
  float max_L = 120.0f, max_C = 512.0f;
  float nL = 1.0f / max_L, nC = 1.0f / max_C;
  const dt_aligned_pixel_t norm2 = { nL * nL, nC * nC, nC * nC, 1.0f };
 
  // faster but less accurate processing by skipping half the patches on previews and thumbnails
  const int decimate = (pipe->type == DT_DEV_PIXELPIPE_THUMBNAIL
                        || dt_dev_pixelpipe_has_preview_output(piece->module->dev, pipe, roi_out));
 
  const dt_nlmeans_param_t params = { .scattering = 0,
                                      .scale = scale,
                                      .luma = d->luma,
                                      .chroma = d->chroma,
                                      .center_weight = -1,
                                      .sharpness = sharpness,
                                      .patch_radius = P,
                                      .search_radius = K,
                                      .decimate = decimate,
                                      .norm = norm2,
                                      .pipe = pipe };
  if(denoiser(ivoid,ovoid,roi_in,roi_out,&params)) return 1;
  if(pipe->mask_display & DT_DEV_PIXELPIPE_DISPLAY_MASK)
    dt_iop_alpha_copy(ivoid, ovoid, roi_out->width, roi_out->height);
  return 0;
}
 
int process(struct dt_iop_module_t *self, const dt_dev_pixelpipe_t *pipe, const dt_dev_pixelpipe_iop_t *piece, const void *const ivoid,
             void *const ovoid)
{
  const dt_iop_roi_t *const roi_in = &piece->roi_in;
  const dt_iop_roi_t *const roi_out = &piece->roi_out;
  return process_cpu(pipe, piece, ivoid, ovoid, roi_in, roi_out, nlmeans_denoise);
}
 
void init_global(dt_iop_module_so_t *module)
{
  const int program = 5; // nlmeans.cl, from programs.conf
  dt_iop_nlmeans_global_data_t *gd
      = (dt_iop_nlmeans_global_data_t *)malloc(sizeof(dt_iop_nlmeans_global_data_t));
  module->data = gd;
  gd->kernel_nlmeans_init = dt_opencl_create_kernel(program, "nlmeans_init");
  gd->kernel_nlmeans_dist = dt_opencl_create_kernel(program, "nlmeans_dist");
  gd->kernel_nlmeans_horiz = dt_opencl_create_kernel(program, "nlmeans_horiz");
  gd->kernel_nlmeans_vert = dt_opencl_create_kernel(program, "nlmeans_vert");
  gd->kernel_nlmeans_accu = dt_opencl_create_kernel(program, "nlmeans_accu");
  gd->kernel_nlmeans_finish = dt_opencl_create_kernel(program, "nlmeans_finish");
}
 
void cleanup_global(dt_iop_module_so_t *module)
{
  dt_iop_nlmeans_global_data_t *gd = (dt_iop_nlmeans_global_data_t *)module->data;
  dt_opencl_free_kernel(gd->kernel_nlmeans_init);
  dt_opencl_free_kernel(gd->kernel_nlmeans_dist);
  dt_opencl_free_kernel(gd->kernel_nlmeans_horiz);
  dt_opencl_free_kernel(gd->kernel_nlmeans_vert);
  dt_opencl_free_kernel(gd->kernel_nlmeans_accu);
  dt_opencl_free_kernel(gd->kernel_nlmeans_finish);
  dt_free(module->data);
}
 
void commit_params(struct dt_iop_module_t *self, dt_iop_params_t *params, dt_dev_pixelpipe_t *pipe,
                   dt_dev_pixelpipe_iop_t *piece)
{
  dt_iop_nlmeans_params_t *p = (dt_iop_nlmeans_params_t *)params;
  dt_iop_nlmeans_data_t *d = (dt_iop_nlmeans_data_t *)piece->data;
  memcpy(d, p, sizeof(*d));
  d->luma = MAX(0.0001f, p->luma);
  d->chroma = MAX(0.0001f, p->chroma);
}
 
void init_pipe(struct dt_iop_module_t *self, dt_dev_pixelpipe_t *pipe, dt_dev_pixelpipe_iop_t *piece)
{
  piece->data = dt_calloc_align(sizeof(dt_iop_nlmeans_data_t));
  piece->data_size = sizeof(dt_iop_nlmeans_data_t);
}
 
void cleanup_pipe(struct dt_iop_module_t *self, dt_dev_pixelpipe_t *pipe, dt_dev_pixelpipe_iop_t *piece)
{
  dt_free_align(piece->data);
  piece->data = NULL;
}
 
void gui_init(dt_iop_module_t *self)
{
  dt_iop_nlmeans_gui_data_t *g = IOP_GUI_ALLOC(nlmeans);
 
  g->radius = dt_bauhaus_slider_from_params(self, "radius");
  dt_bauhaus_slider_set_soft_max(g->radius, 4.0f);
  dt_bauhaus_slider_set_digits(g->radius, 0);
  gtk_widget_set_tooltip_text(g->radius, _("radius of the patches to match"));
  g->strength = dt_bauhaus_slider_from_params(self, N_("strength"));
  dt_bauhaus_slider_set_soft_max(g->strength, 100.0f);
  dt_bauhaus_slider_set_digits(g->strength, 0);
  dt_bauhaus_slider_set_format(g->strength, "%");
  gtk_widget_set_tooltip_text(g->strength, _("strength of the effect"));
  g->luma = dt_bauhaus_slider_from_params(self, N_("luma"));
  dt_bauhaus_slider_set_format(g->luma, "%");
  gtk_widget_set_tooltip_text(g->luma, _("how much to smooth brightness"));
  g->chroma = dt_bauhaus_slider_from_params(self, N_("chroma"));
  dt_bauhaus_slider_set_format(g->chroma, "%");
  gtk_widget_set_tooltip_text(g->chroma, _("how much to smooth colors"));
}
 
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// modelines: These editor modelines have been set for all relevant files by tools/update_modelines.py
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// kate: tab-indents: off; indent-width 2; replace-tabs on; indent-mode cstyle; remove-trailing-spaces modified;
// clang-format on