shadhi.c

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/*
  This file is part of darktable,
  Copyright (C) 2011 Brian Teague.
  Copyright (C) 2011 Henrik Andersson.
  Copyright (C) 2011-2013, 2016-2017 johannes hanika.
  Copyright (C) 2011 Jérémy Rosen.
  Copyright (C) 2011 Robert Bieber.
  Copyright (C) 2011-2014, 2016, 2019 Tobias Ellinghaus.
  Copyright (C) 2011-2012, 2014-2017 Ulrich Pegelow.
  Copyright (C) 2012 Pascal de Bruijn.
  Copyright (C) 2012 Richard Wonka.
  Copyright (C) 2013-2016 Roman Lebedev.
  Copyright (C) 2015 Pedro Côrte-Real.
  Copyright (C) 2017 Heiko Bauke.
  Copyright (C) 2018, 2020, 2022-2023, 2025-2026 Aurélien PIERRE.
  Copyright (C) 2018 Edgardo Hoszowski.
  Copyright (C) 2018 Maurizio Paglia.
  Copyright (C) 2018, 2020, 2022 Pascal Obry.
  Copyright (C) 2018 rawfiner.
  Copyright (C) 2019 Andreas Schneider.
  Copyright (C) 2020 Aldric Renaudin.
  Copyright (C) 2020-2021 Chris Elston.
  Copyright (C) 2020, 2022 Diederik Ter Rahe.
  Copyright (C) 2020-2021 Hubert Kowalski.
  Copyright (C) 2020-2021 Ralf Brown.
  Copyright (C) 2022 Hanno Schwalm.
  Copyright (C) 2022 Martin Bařinka.
  Copyright (C) 2022 Philipp Lutz.
  
  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 "config.h"
#endif
#include "widgets/bauhaus.h"
#include "pixel/bilateral.h"
#include "pixel/gaussian.h"
#include "develop/develop.h"
#include "system/macros.h"
#include "system/openmp.h"
#include "system/target_clones.h"
#include "system/mem_alloc.h"
#include "system/simd.h"
#include "common/module_versioning.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 <assert.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
 
#include <gtk/gtk.h>
#include <inttypes.h>
 
#define UNBOUND_L 1
#define UNBOUND_A 2
#define UNBOUND_B 4
#define UNBOUND_SHADOWS_L UNBOUND_L
#define UNBOUND_SHADOWS_A UNBOUND_A
#define UNBOUND_SHADOWS_B UNBOUND_B
#define UNBOUND_HIGHLIGHTS_L (UNBOUND_L << 3) /* 8 */
#define UNBOUND_HIGHLIGHTS_A (UNBOUND_A << 3) /* 16 */
#define UNBOUND_HIGHLIGHTS_B (UNBOUND_B << 3) /* 32 */
#define UNBOUND_GAUSSIAN 64
#define UNBOUND_BILATERAL 128 /* not implemented yet */
#define UNBOUND_DEFAULT                                                                                      \
  (UNBOUND_SHADOWS_L | UNBOUND_SHADOWS_A | UNBOUND_SHADOWS_B | UNBOUND_HIGHLIGHTS_L | UNBOUND_HIGHLIGHTS_A   \
   | UNBOUND_HIGHLIGHTS_B | UNBOUND_GAUSSIAN)
 
DT_MODULE_INTROSPECTION(5, dt_iop_shadhi_params_t)
 
typedef enum dt_iop_shadhi_algo_t
{
  SHADHI_ALGO_GAUSSIAN, // $DESCRIPTION: "gaussian"
  SHADHI_ALGO_BILATERAL // $DESCRIPTION: "bilateral filter"
} dt_iop_shadhi_algo_t;
 
/* legacy version 1 params */
typedef struct dt_iop_shadhi_params1_t
{
  dt_gaussian_order_t order;
  float radius;
  float shadows;
  float reserved1;
  float highlights;
  float reserved2;
  float compress;
} dt_iop_shadhi_params1_t;
 
/* legacy version 2 params */
typedef struct dt_iop_shadhi_params2_t
{
  dt_gaussian_order_t order;
  float radius;
  float shadows;
  float reserved1;
  float highlights;
  float reserved2;
  float compress;
  float shadows_ccorrect;
  float highlights_ccorrect;
} dt_iop_shadhi_params2_t;
 
typedef struct dt_iop_shadhi_params3_t
{
  dt_gaussian_order_t order;
  float radius;
  float shadows;
  float reserved1;
  float highlights;
  float reserved2;
  float compress;
  float shadows_ccorrect;
  float highlights_ccorrect;
  unsigned int flags;
} dt_iop_shadhi_params3_t;
 
typedef struct dt_iop_shadhi_params4_t
{
  dt_gaussian_order_t order;
  float radius;
  float shadows;
  float whitepoint;
  float highlights;
  float reserved2;
  float compress;
  float shadows_ccorrect;
  float highlights_ccorrect;
  unsigned int flags;
  float low_approximation;
} dt_iop_shadhi_params4_t;
 
typedef struct dt_iop_shadhi_params_t
{
  dt_gaussian_order_t order; // $DEFAULT: DT_IOP_GAUSSIAN_ZERO
  float radius;     // $MIN: 0.1 $MAX: 500.0 $DEFAULT: 100.0
  float shadows;    // $MIN: -100.0 $MAX: 100.0 $DEFAULT: 50.0
  float whitepoint; // $MIN: -10.0 $MAX: 10.0 $DEFAULT: 0.0 $DESCRIPTION: "white point adjustment"
  float highlights; // $MIN: -100.0 $MAX: 100.0 $DEFAULT: -50.0
  float reserved2;
  float compress;   // $MIN: 0.0 $MAX: 100.0 $DEFAULT: 50.0
  float shadows_ccorrect;    // $MIN: 0.0 $MAX: 100.0 $DEFAULT: 100.0 $DESCRIPTION: "shadows color adjustment"
  float highlights_ccorrect; // $MIN: 0.0 $MAX: 100.0 $DEFAULT: 50.0 $DESCRIPTION: "highlights color adjustment"
  unsigned int flags;        // $DEFAULT: UNBOUND_DEFAULT
  float low_approximation;   // $DEFAULT: 0.000001
  dt_iop_shadhi_algo_t shadhi_algo; // $DEFAULT: SHADHI_ALGO_GAUSSIAN $DESCRIPTION: "soften with" $DEFAULT: 0
} dt_iop_shadhi_params_t;
 
typedef struct dt_iop_shadhi_gui_data_t
{
  GtkWidget *shadows;
  GtkWidget *highlights;
  GtkWidget *whitepoint;
  GtkWidget *radius;
  GtkWidget *compress;
  GtkWidget *shadows_ccorrect;
  GtkWidget *highlights_ccorrect;
  GtkWidget *shadhi_algo;
} dt_iop_shadhi_gui_data_t;
 
typedef struct dt_iop_shadhi_data_t
{
  dt_gaussian_order_t order;
  float radius;
  float shadows;
  float highlights;
  float whitepoint;
  float compress;
  float shadows_ccorrect;
  float highlights_ccorrect;
  unsigned int flags;
  float low_approximation;
  dt_iop_shadhi_algo_t shadhi_algo;
} dt_iop_shadhi_data_t;
 
const char *name()
{
  return _("shadows and highlights");
}
 
int flags()
{
  return IOP_FLAGS_INCLUDE_IN_STYLES | IOP_FLAGS_SUPPORTS_BLENDING | IOP_FLAGS_ALLOW_TILING | IOP_FLAGS_DEPRECATED;
}
 
int default_group()
{
  return IOP_GROUP_TONES;
}
 
int default_colorspace(dt_iop_module_t *self, dt_dev_pixelpipe_t *pipe, const dt_dev_pixelpipe_iop_t *piece)
{
  return IOP_CS_LAB;
}
 
const char **description(struct dt_iop_module_t *self)
{
  return dt_iop_set_description(self, _("modify the tonal range of the shadows and highlights\n"
                                        "of an image by enhancing local contrast."),
                                      _("corrective and creative"),
                                      _("linear or non-linear, Lab, display-referred"),
                                      _("non-linear, Lab"),
                                      _("non-linear, Lab, display-referred"));
}
 
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 == 5)
  {
    const dt_iop_shadhi_params1_t *old = old_params;
    dt_iop_shadhi_params_t *new = new_params;
    new->order = old->order;
    new->radius = fabs(old->radius);
    new->shadows = 0.5f * old->shadows;
    new->whitepoint = old->reserved1;
    new->reserved2 = old->reserved2;
    new->highlights = -0.5f * old->highlights;
    new->flags = 0;
    new->compress = old->compress;
    new->shadows_ccorrect = 100.0f;
    new->highlights_ccorrect = 0.0f;
    new->low_approximation = 0.01f;
    new->shadhi_algo = old->radius < 0.0f ? SHADHI_ALGO_BILATERAL : SHADHI_ALGO_GAUSSIAN;
    return 0;
  }
  else if(old_version == 2 && new_version == 5)
  {
    const dt_iop_shadhi_params2_t *old = old_params;
    dt_iop_shadhi_params_t *new = new_params;
    new->order = old->order;
    new->radius = fabs(old->radius);
    new->shadows = old->shadows;
    new->whitepoint = old->reserved1;
    new->reserved2 = old->reserved2;
    new->highlights = old->highlights;
    new->compress = old->compress;
    new->shadows_ccorrect = old->shadows_ccorrect;
    new->highlights_ccorrect = old->highlights_ccorrect;
    new->flags = 0;
    new->low_approximation = 0.01f;
    new->shadhi_algo = old->radius < 0.0f ? SHADHI_ALGO_BILATERAL : SHADHI_ALGO_GAUSSIAN;
    return 0;
  }
  else if(old_version == 3 && new_version == 5)
  {
    const dt_iop_shadhi_params3_t *old = old_params;
    dt_iop_shadhi_params_t *new = new_params;
    new->order = old->order;
    new->radius = fabs(old->radius);
    new->shadows = old->shadows;
    new->whitepoint = old->reserved1;
    new->reserved2 = old->reserved2;
    new->highlights = old->highlights;
    new->compress = old->compress;
    new->shadows_ccorrect = old->shadows_ccorrect;
    new->highlights_ccorrect = old->highlights_ccorrect;
    new->flags = old->flags;
    new->low_approximation = 0.01f;
    new->shadhi_algo = old->radius < 0.0f ? SHADHI_ALGO_BILATERAL : SHADHI_ALGO_GAUSSIAN;
    return 0;
  }
  else if(old_version == 4 && new_version == 5)
  {
    const dt_iop_shadhi_params4_t *old = old_params;
    dt_iop_shadhi_params_t *new = new_params;
    new->order = old->order;
    new->radius = fabs(old->radius);
    new->shadows = old->shadows;
    new->whitepoint = old->whitepoint;
    new->reserved2 = old->reserved2;
    new->highlights = old->highlights;
    new->compress = old->compress;
    new->shadows_ccorrect = old->shadows_ccorrect;
    new->highlights_ccorrect = old->highlights_ccorrect;
    new->flags = old->flags;
    new->low_approximation = old->low_approximation;
    new->shadhi_algo = old->radius < 0.0f ? SHADHI_ALGO_BILATERAL : SHADHI_ALGO_GAUSSIAN;
    return 0;
  }
  return 1;
}
 
 
static inline void _Lab_scale(const float *i, float *o)
{
  o[0] = i[0] / 100.0f;
  o[1] = i[1] / 128.0f;
  o[2] = i[2] / 128.0f;
}
 
 
static inline void _Lab_rescale(const float *i, float *o)
{
  o[0] = i[0] * 100.0f;
  o[1] = i[1] * 128.0f;
  o[2] = i[2] * 128.0f;
}
 
static inline float sign(float x)
{
  return (x < 0 ? -1.0f : 1.0f);
}
__DT_CLONE_TARGETS__
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;
  const dt_iop_shadhi_data_t *const restrict data = (dt_iop_shadhi_data_t *)piece->data;
  const float *const restrict in = (float *)ivoid;
  float *const restrict out = (float *)ovoid;
  const int width = roi_out->width;
  const int height = roi_out->height;
  const int ch = piece->dsc_in.channels;
 
  const int order = data->order;
  const float radius = fmaxf(0.1f, data->radius);
  const float sigma = radius * roi_in->scale;
  const float shadows = 2.0f * fmin(fmax(-1.0, (data->shadows / 100.0f)), 1.0f);
  const float highlights = 2.0f * fmin(fmax(-1.0, (data->highlights / 100.0f)), 1.0f);
  const float whitepoint = fmax(1.0f - data->whitepoint / 100.0f, 0.01f);
  const float compress
      = fmin(fmax(0, (data->compress / 100.0f)), 0.99f); // upper limit 0.99f to avoid division by zero later
  const float shadows_ccorrect = (fmin(fmax(0.0f, (data->shadows_ccorrect / 100.0f)), 1.0f) - 0.5f)
                                 * sign(shadows) + 0.5f;
  const float highlights_ccorrect = (fmin(fmax(0.0f, (data->highlights_ccorrect / 100.0f)), 1.0f) - 0.5f)
                                    * sign(-highlights) + 0.5f;
  const unsigned int flags = data->flags;
  const int unbound_mask = ((data->shadhi_algo == SHADHI_ALGO_BILATERAL) && (flags & UNBOUND_BILATERAL))
                           || ((data->shadhi_algo == SHADHI_ALGO_GAUSSIAN) && (flags & UNBOUND_GAUSSIAN));
  const float low_approximation = data->low_approximation;
 
  if(data->shadhi_algo == SHADHI_ALGO_GAUSSIAN)
  {
    dt_aligned_pixel_t Labmax = { 100.0f, 128.0f, 128.0f, 1.0f };
    dt_aligned_pixel_t Labmin = { 0.0f, -128.0f, -128.0f, 0.0f };
 
    if(unbound_mask)
    {
      for(int k = 0; k < 4; k++) Labmax[k] = INFINITY;
      for(int k = 0; k < 4; k++) Labmin[k] = -INFINITY;
    }
 
    dt_gaussian_t *g = dt_gaussian_init(width, height, ch, Labmax, Labmin, sigma, order);
    if(IS_NULL_PTR(g)) return 1;
    dt_gaussian_blur_4c(g, in, out);
    dt_gaussian_free(g);
  }
  else
  {
    const float sigma_r = 100.0f; // d->sigma_r; // does not depend on scale
    const float sigma_s = sigma;
    const float detail = -1.0f; // we want the bilateral base layer
 
    dt_bilateral_t *b = dt_bilateral_init(width, height, sigma_s, sigma_r);
    if(IS_NULL_PTR(b)) return 1;
    dt_bilateral_splat(b, in);
    dt_bilateral_blur(b);
    dt_bilateral_slice(b, in, out, detail);
    dt_bilateral_free(b);
  }
 
  const dt_aligned_pixel_t max = { 1.0f, 1.0f, 1.0f, 1.0f };
  const dt_aligned_pixel_t min = { 0.0f, -1.0f, -1.0f, 0.0f };
  const float lmin = 0.0f;
  const float lmax = max[0] + fabsf(min[0]);
  const float halfmax = lmax / 2.0;
  const float doublemax = lmax * 2.0;
  __OMP_PARALLEL_FOR__()
  for(size_t j = 0; j < (size_t)width * height * ch; j += ch)
  {
    dt_aligned_pixel_t ta, tb;
    _Lab_scale(&in[j], ta);
    // invert and desaturate the blurred output pixel
    out[j + 0] = 100.0f - out[j + 0];
    out[j + 1] = 0.0f;
    out[j + 2] = 0.0f;
    _Lab_scale(&out[j], tb);
 
    ta[0] = ta[0] > 0.0f ? ta[0] / whitepoint : ta[0];
    tb[0] = tb[0] > 0.0f ? tb[0] / whitepoint : tb[0];
 
    // overlay highlights
    float highlights2 = highlights * highlights;
    const float highlights_xform = CLAMP(1.0f - tb[0] / (1.0f - compress), 0.0f, 1.0f);
 
    while(highlights2 > 0.0f)
    {
      const float la = (flags & UNBOUND_HIGHLIGHTS_L) ? ta[0] : CLAMP(ta[0], lmin, lmax);
      float lb = (tb[0] - halfmax) * sign(-highlights) * sign(lmax - la) + halfmax;
      lb = unbound_mask ? lb : CLAMP(lb, lmin, lmax);
      const float lref = copysignf(fabsf(la) > low_approximation ? 1.0f / fabsf(la) : 1.0f / low_approximation, la);
      const float href = copysignf(
          fabsf(1.0f - la) > low_approximation ? 1.0f / fabsf(1.0f - la) : 1.0f / low_approximation, 1.0f - la);
 
      const float chunk = highlights2 > 1.0f ? 1.0f : highlights2;
      const float optrans = chunk * highlights_xform;
      highlights2 -= 1.0f;
 
      ta[0] = la * (1.0 - optrans)
              + (la > halfmax ? lmax - (lmax - doublemax * (la - halfmax)) * (lmax - lb) : doublemax * la
                                                                                           * lb) * optrans;
 
      ta[0] = (flags & UNBOUND_HIGHLIGHTS_L) ? ta[0] : CLAMP(ta[0], lmin, lmax);
 
      const float chroma_factor = (ta[0] * lref * (1.0f - highlights_ccorrect)
                                   + (1.0f - ta[0]) * href * highlights_ccorrect);
      ta[1] = ta[1] * (1.0f - optrans) + (ta[1] + tb[1]) * chroma_factor * optrans;
      ta[1] = (flags & UNBOUND_HIGHLIGHTS_A) ? ta[1] : CLAMP(ta[1], min[1], max[1]);
 
      ta[2] = ta[2] * (1.0f - optrans) + (ta[2] + tb[2]) * chroma_factor * optrans;
      ta[2] = (flags & UNBOUND_HIGHLIGHTS_B) ? ta[2] : CLAMP(ta[2], min[2], max[2]);
    }
 
    // overlay shadows
    float shadows2 = shadows * shadows;
    const float shadows_xform = CLAMP(tb[0] / (1.0f - compress) - compress / (1.0f - compress), 0.0f, 1.0f);
 
    while(shadows2 > 0.0f)
    {
      const float la = (flags & UNBOUND_HIGHLIGHTS_L) ? ta[0] : CLAMP(ta[0], lmin, lmax);
      float lb = (tb[0] - halfmax) * sign(shadows) * sign(lmax - la) + halfmax;
      lb = unbound_mask ? lb : CLAMP(lb, lmin, lmax);
      const float lref = copysignf(fabsf(la) > low_approximation ? 1.0f / fabsf(la) : 1.0f / low_approximation, la);
      const float href = copysignf(
          fabsf(1.0f - la) > low_approximation ? 1.0f / fabsf(1.0f - la) : 1.0f / low_approximation, 1.0f - la);
 
 
      const float chunk = shadows2 > 1.0f ? 1.0f : shadows2;
      const float optrans = chunk * shadows_xform;
      shadows2 -= 1.0f;
 
      ta[0] = la * (1.0 - optrans)
              + (la > halfmax ? lmax - (lmax - doublemax * (la - halfmax)) * (lmax - lb) : doublemax * la
                                                                                           * lb) * optrans;
 
      ta[0] = (flags & UNBOUND_SHADOWS_L) ? ta[0] : CLAMP(ta[0], lmin, lmax);
 
      const float chroma_factor = (ta[0] * lref * shadows_ccorrect
                                   + (1.0f - ta[0]) * href * (1.0f - shadows_ccorrect));
      ta[1] = ta[1] * (1.0f - optrans) + (ta[1] + tb[1]) * chroma_factor * optrans;
      ta[1] = (flags & UNBOUND_SHADOWS_A) ? ta[1] : CLAMP(ta[1], min[1], max[1]);
 
      ta[2] = ta[2] * (1.0f - optrans) + (ta[2] + tb[2]) * chroma_factor * optrans;
      ta[2] = (flags & UNBOUND_SHADOWS_B) ? ta[2] : CLAMP(ta[2], min[2], max[2]);
    }
 
    _Lab_rescale(ta, &out[j]);
  }
 
  if(pipe->mask_display & DT_DEV_PIXELPIPE_DISPLAY_MASK) dt_iop_alpha_copy(ivoid, ovoid, roi_out->width, roi_out->height);
  return 0;
}
 
 
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)
{
  (void)self;
  (void)pipe;
  const dt_iop_roi_t *const roi_in = &piece->roi_in;
  dt_iop_shadhi_data_t *d = (dt_iop_shadhi_data_t *)piece->data;
 
  const int width = roi_in->width;
  const int height = roi_in->height;
  const int channels = piece->dsc_in.channels;
 
  const float radius = fmax(0.1f, d->radius);
  const float sigma = radius * roi_in->scale;
  const float sigma_r = 100.0f; // does not depend on scale
  const float sigma_s = sigma;
 
  const size_t basebuffer = sizeof(float) * channels * width * height;
 
  if(d->shadhi_algo == SHADHI_ALGO_BILATERAL)
  {
    // bilateral filter
    tiling->factor = 2.0f + fmax(1.0f, (float)dt_bilateral_memory_use(width, height, sigma_s, sigma_r) / basebuffer);
    tiling->maxbuf
        = fmax(1.0f, (float)dt_bilateral_singlebuffer_size(width, height, sigma_s, sigma_r) / basebuffer);
  }
  else
  {
    // gaussian blur
    tiling->factor = 2.0f + fmax(1.0f, (float)dt_gaussian_memory_use(width, height, channels) / basebuffer);
    tiling->maxbuf = fmax(1.0f, (float)dt_gaussian_singlebuffer_size(width, height, channels) / basebuffer);
  }
 
  tiling->overhead = 0;
  tiling->overlap = ceilf(4 * sigma);
  tiling->xalign = 1;
  tiling->yalign = 1;
  return;
}
 
void commit_params(struct dt_iop_module_t *self, dt_iop_params_t *p1, dt_dev_pixelpipe_t *pipe,
                   dt_dev_pixelpipe_iop_t *piece)
{
  dt_iop_shadhi_params_t *p = (dt_iop_shadhi_params_t *)p1;
  dt_iop_shadhi_data_t *d = (dt_iop_shadhi_data_t *)piece->data;
 
  d->order = p->order;
  d->radius = p->radius;
  d->shadows = p->shadows;
  d->highlights = p->highlights;
  d->whitepoint = p->whitepoint;
  d->compress = p->compress;
  d->shadows_ccorrect = p->shadows_ccorrect;
  d->highlights_ccorrect = p->highlights_ccorrect;
  d->flags = p->flags;
  d->low_approximation = p->low_approximation;
  d->shadhi_algo = p->shadhi_algo;
}
 
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_shadhi_data_t));
  piece->data_size = sizeof(dt_iop_shadhi_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(struct dt_iop_module_t *self)
{
  dt_iop_shadhi_gui_data_t *g = IOP_GUI_ALLOC(shadhi);
 
  g->shadows = dt_bauhaus_slider_from_params(self, N_("shadows"));
  g->highlights = dt_bauhaus_slider_from_params(self, N_("highlights"));
  g->whitepoint = dt_bauhaus_slider_from_params(self, "whitepoint");
  g->shadhi_algo = dt_bauhaus_combobox_from_params(self, "shadhi_algo");
  g->radius = dt_bauhaus_slider_from_params(self, N_("radius"));
  g->compress = dt_bauhaus_slider_from_params(self, N_("compress"));
  dt_bauhaus_slider_set_format(g->compress, "%");
  g->shadows_ccorrect = dt_bauhaus_slider_from_params(self, "shadows_ccorrect");
  dt_bauhaus_slider_set_format(g->shadows_ccorrect, "%");
  g->highlights_ccorrect = dt_bauhaus_slider_from_params(self, "highlights_ccorrect");
  dt_bauhaus_slider_set_format(g->highlights_ccorrect, "%");
 
  gtk_widget_set_tooltip_text(g->shadows, _("correct shadows"));
  gtk_widget_set_tooltip_text(g->highlights, _("correct highlights"));
  gtk_widget_set_tooltip_text(g->whitepoint, _("shift white point"));
  gtk_widget_set_tooltip_text(g->radius, _("spatial extent"));
  gtk_widget_set_tooltip_text(g->shadhi_algo, _("filter to use for softening. bilateral avoids halos"));
  gtk_widget_set_tooltip_text(g->compress, _("compress the effect on shadows/highlights and\npreserve mid-tones"));
  gtk_widget_set_tooltip_text(g->shadows_ccorrect, _("adjust saturation of shadows"));
  gtk_widget_set_tooltip_text(g->highlights_ccorrect, _("adjust saturation of highlights"));
}
 
// clang-format off
// modelines: These editor modelines have been set for all relevant files by tools/update_modelines.py
// vim: shiftwidth=2 expandtab tabstop=2 cindent
// kate: tab-indents: off; indent-width 2; replace-tabs on; indent-mode cstyle; remove-trailing-spaces modified;
// clang-format on