temperature.c

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/*
    This file is part of darktable,
    Copyright (C) 2009-2013, 2016 johannes hanika.
    Copyright (C) 2010 Alexandre Prokoudine.
    Copyright (C) 2010-2011 Bruce Guenter.
    Copyright (C) 2010-2012 Henrik Andersson.
    Copyright (C) 2010, 2012-2014 Pascal de Bruijn.
    Copyright (C) 2010 Stuart Henderson.
    Copyright (C) 2011 Antony Dovgal.
    Copyright (C) 2011 Jérémy Rosen.
    Copyright (C) 2011 Kanstantsin Shautsou.
    Copyright (C) 2011 Olivier Tribout.
    Copyright (C) 2011 Robert Bieber.
    Copyright (C) 2011 Rostyslav Pidgornyi.
    Copyright (C) 2011-2017, 2019 Tobias Ellinghaus.
    Copyright (C) 2011-2012, 2014, 2016-2017 Ulrich Pegelow.
    Copyright (C) 2012 Christian Tellefsen.
    Copyright (C) 2012 Edouard Gomez.
    Copyright (C) 2012 Richard Wonka.
    Copyright (C) 2013, 2020, 2022 Aldric Renaudin.
    Copyright (C) 2013, 2018-2022 Pascal Obry.
    Copyright (C) 2014, 2018 Dan Torop.
    Copyright (C) 2014-2016 Pedro Côrte-Real.
    Copyright (C) 2014-2017, 2020 Roman Lebedev.
    Copyright (C) 2017-2018 Matthieu Moy.
    Copyright (C) 2018, 2020, 2022-2023, 2025-2026 Aurélien PIERRE.
    Copyright (C) 2018-2019 Edgardo Hoszowski.
    Copyright (C) 2018 Kelvie Wong.
    Copyright (C) 2018 Maurizio Paglia.
    Copyright (C) 2018 Peter Budai.
    Copyright (C) 2018 rawfiner.
    Copyright (C) 2019 Andreas Schneider.
    Copyright (C) 2019-2022 Diederik Ter Rahe.
    Copyright (C) 2019-2020, 2022 Hanno Schwalm.
    Copyright (C) 2020-2021 Chris Elston.
    Copyright (C) 2020 Harold le Clément de Saint-Marcq.
    Copyright (C) 2020-2021 Hubert Kowalski.
    Copyright (C) 2020-2021 Ralf Brown.
    Copyright (C) 2021 luzpaz.
    Copyright (C) 2022 Martin Bařinka.
    Copyright (C) 2022 Miloš Komarčević.
    Copyright (C) 2022 Nicolas Auffray.
    Copyright (C) 2022 Philipp Lutz.
    Copyright (C) 2022 Victor Forsiuk.
    
    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 <assert.h>
#include <lcms2.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
 
#include "bauhaus/bauhaus.h"
#include "common/colorspaces_inline_conversions.h"
#include "common/darktable.h"
#include "common/opencl.h"
#include "control/control.h"
#include "control/conf.h"
#include "develop/develop.h"
#include "develop/imageop_gui.h"
#include "develop/imageop_math.h"
#include "develop/tiling.h"
#include "dtgtk/expander.h"
 
#include "gui/gtk.h"
#include "gui/color_picker_proxy.h"
#include "iop/iop_api.h"
 
// for Kelvin temperature and bogus WB
#include "common/colorspaces.h"
#include "external/cie_colorimetric_tables.c"
 
DT_MODULE_INTROSPECTION(3, dt_iop_temperature_params_t)
 
#define INITIALBLACKBODYTEMPERATURE 4000
 
#define DT_IOP_LOWEST_TEMPERATURE 1901
#define DT_IOP_HIGHEST_TEMPERATURE 25000
 
#define DT_IOP_LOWEST_TINT 0.135
#define DT_IOP_HIGHEST_TINT 2.326
 
#define DT_IOP_NUM_OF_STD_TEMP_PRESETS 4
 
// If you reorder presets combo, change this consts
#define DT_IOP_TEMP_AS_SHOT 0
#define DT_IOP_TEMP_SPOT 1
#define DT_IOP_TEMP_USER 2
#define DT_IOP_TEMP_D65 3
 
static void gui_sliders_update(struct dt_iop_module_t *self);
 
typedef struct dt_iop_temperature_params_t
{
  float red;    // $MIN: 0.0 $MAX: 8.0
  float green;  // $MIN: 0.0 $MAX: 8.0
  float blue;   // $MIN: 0.0 $MAX: 8.0
  float g2;     // $MIN: 0.0 $MAX: 8.0 $DESCRIPTION: "emerald"
} dt_iop_temperature_params_t;
 
typedef struct dt_iop_temperature_gui_data_t
{
  GtkWidget *scale_k, *scale_tint, *scale_r, *scale_g, *scale_b, *scale_g2;
  GtkWidget *presets;
  GtkWidget *buttonbar;
  GtkWidget *colorpicker;
  GtkWidget *btn_asshot; //As Shot
  GtkWidget *btn_user;
  GtkWidget *btn_d65;
  GtkWidget *temp_label;
  GtkWidget *balance_label;
  int preset_cnt;
  int preset_num[54];
  double daylight_wb[4];
  double as_shot_wb[4];
  double mod_coeff[4];
  float mod_temp, mod_tint;
  double XYZ_to_CAM[4][3], CAM_to_XYZ[3][4];
  int colored_sliders;
  int blackbody_is_confusing;
  gboolean button_bar_visible;
  dt_gui_collapsible_section_t cs;
} dt_iop_temperature_gui_data_t;
 
typedef struct dt_iop_temperature_data_t
{
  float coeffs[4];
} dt_iop_temperature_data_t;
 
typedef struct dt_iop_temperature_global_data_t
{
  int kernel_whitebalance_4f;
  int kernel_whitebalance_1f;
  int kernel_whitebalance_1f_xtrans;
} dt_iop_temperature_global_data_t;
 
typedef struct dt_iop_temperature_preset_data_t
{
  int no_ft_pos;
  int min_ft_pos;
  int max_ft_pos;
} dt_iop_temperature_preset_data_t;
 
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 == 2 && new_version == 3)
  {
    typedef struct dt_iop_temperature_params_v2_t
    {
      float temp_out;
      float coeffs[3];
    } dt_iop_temperature_params_v2_t;
 
    dt_iop_temperature_params_v2_t *o = (dt_iop_temperature_params_v2_t *)old_params;
    dt_iop_temperature_params_t *n = (dt_iop_temperature_params_t *)new_params;
 
    n->red = o->coeffs[0];
    n->green = o->coeffs[1];
    n->blue = o->coeffs[2];
    n->g2 = NAN;
 
    return 0;
  }
  return 1;
}
 
static inline void _temp_params_from_array(dt_iop_temperature_params_t *p, const double a[4])
{
  p->red = a[0]; p->green = a[1]; p->blue = a[2]; p->g2 = a[3];
}
 
static inline void _temp_array_from_params(double a[4], const dt_iop_temperature_params_t *p)
{
  a[0] = p->red; a[1] = p->green; a[2] = p->blue; a[3] = p->g2;
}
 
static int ignore_missing_wb(dt_image_t *img)
{
  // Ignore files that end with "-hdr.dng" since these are broken files we
  // generated without any proper WB tagged
  if(g_str_has_suffix(img->filename,"-hdr.dng"))
    return TRUE;
 
  static const char *const ignored_cameras[] = {
    "Canon PowerShot A610",
    "Canon PowerShot S3 IS",
    "Canon PowerShot A620",
    "Canon PowerShot A720 IS",
    "Canon PowerShot A630",
    "Canon PowerShot A640",
    "Canon PowerShot A650",
    "Canon PowerShot SX110 IS",
    "Mamiya ZD",
    "Canon EOS D2000C",
    "Kodak EOS DCS 1",
    "Kodak DCS560C",
    "Kodak DCS460D",
    "Nikon E5700",
    "Sony DSC-F828",
    "GITUP GIT2",
  };
 
  for(int i=0; i < sizeof(ignored_cameras)/sizeof(ignored_cameras[1]); i++)
    if(!strcmp(img->camera_makermodel, ignored_cameras[i]))
      return TRUE;
 
  return FALSE;
}
 
 
const char *name()
{
  return C_("modulename", "white balance");
}
 
const char **description(struct dt_iop_module_t *self)
{
  return dt_iop_set_description(self, _("scale raw RGB channels to balance white and help demosaicing"),
                                      _("corrective"),
                                      _("linear, raw, scene-referred"),
                                      _("linear, raw"),
                                      _("linear, raw, scene-referred"));
}
 
int default_group()
{
  return IOP_GROUP_TECHNICAL;
}
 
int flags()
{
  return IOP_FLAGS_ALLOW_TILING | IOP_FLAGS_ONE_INSTANCE;
}
 
int default_colorspace(dt_iop_module_t *self, dt_dev_pixelpipe_t *pipe, const dt_dev_pixelpipe_iop_t *piece)
{
  // This module may work in RAW or RGB (e.g. for TIFF files) depending on the input
  // The module does not change the color space between the input and output, therefore implement it here
  if(piece && piece->dsc_in.cst != IOP_CS_RAW)
    return IOP_CS_RGB;
  return IOP_CS_RAW;
}
 
void output_format(dt_iop_module_t *self, dt_dev_pixelpipe_t *pipe, dt_dev_pixelpipe_iop_t *piece,
                   dt_iop_buffer_dsc_t *dsc)
{
  default_output_format(self, pipe, piece, dsc);
}
 
/*
 * Spectral power distribution functions
 * https://en.wikipedia.org/wiki/Spectral_power_distribution
 */
typedef double((*spd)(unsigned long int wavelength, double TempK));
 
/*
 * Bruce Lindbloom, "Spectral Power Distribution of a Blackbody Radiator"
 * http://www.brucelindbloom.com/Eqn_Blackbody.html
 */
static double spd_blackbody(unsigned long int wavelength, double TempK)
{
  // convert wavelength from nm to m
  const long double lambda = (double)wavelength * 1e-9;
 
/*
 * these 2 constants were computed using following Sage code:
 *
 * (from http://physics.nist.gov/cgi-bin/cuu/Value?h)
 * h = 6.62606957 * 10^-34 # Planck
 * c= 299792458 # speed of light in vacuum
 * k = 1.3806488 * 10^-23 # Boltzmann
 *
 * c_1 = 2 * pi * h * c^2
 * c_2 = h * c / k
 *
 * print 'c_1 = ', c_1, ' ~= ', RealField(128)(c_1)
 * print 'c_2 = ', c_2, ' ~= ', RealField(128)(c_2)
 */
 
#define c1 3.7417715246641281639549488324352159753e-16L
#define c2 0.014387769599838156481252937624049081933L
 
  return (double)(c1 / (powl(lambda, 5) * (expl(c2 / (lambda * TempK)) - 1.0L)));
 
#undef c2
#undef c1
}
 
/*
 * Bruce Lindbloom, "Spectral Power Distribution of a CIE D-Illuminant"
 * http://www.brucelindbloom.com/Eqn_DIlluminant.html
 * and https://en.wikipedia.org/wiki/Standard_illuminant#Illuminant_series_D
 */
static double spd_daylight(unsigned long int wavelength, double TempK)
{
  cmsCIExyY WhitePoint = { 0.3127, 0.3290, 1.0 };
 
  /*
   * Bruce Lindbloom, "TempK to xy"
   * http://www.brucelindbloom.com/Eqn_T_to_xy.html
   */
  cmsWhitePointFromTemp(&WhitePoint, TempK);
 
  const double M = (0.0241 + 0.2562 * WhitePoint.x - 0.7341 * WhitePoint.y),
               m1 = (-1.3515 - 1.7703 * WhitePoint.x + 5.9114 * WhitePoint.y) / M,
               m2 = (0.0300 - 31.4424 * WhitePoint.x + 30.0717 * WhitePoint.y) / M;
 
  const unsigned long int j
      = ((wavelength - cie_daylight_components[0].wavelength)
         / (cie_daylight_components[1].wavelength - cie_daylight_components[0].wavelength));
 
  return (cie_daylight_components[j].S[0] + m1 * cie_daylight_components[j].S[1]
          + m2 * cie_daylight_components[j].S[2]);
}
 
/*
 * Bruce Lindbloom, "Computing XYZ From Spectral Data (Emissive Case)"
 * http://www.brucelindbloom.com/Eqn_Spect_to_XYZ.html
 */
static cmsCIEXYZ spectrum_to_XYZ(double TempK, spd I)
{
  cmsCIEXYZ Source = {.X = 0.0, .Y = 0.0, .Z = 0.0 };
 
  /*
   * Color matching functions
   * https://en.wikipedia.org/wiki/CIE_1931_color_space#Color_matching_functions
   */
  for(size_t i = 0; i < cie_1931_std_colorimetric_observer_count; i++)
  {
    const unsigned long int lambda = cie_1931_std_colorimetric_observer[0].wavelength
                                     + (cie_1931_std_colorimetric_observer[1].wavelength
                                        - cie_1931_std_colorimetric_observer[0].wavelength) * i;
    const double P = I(lambda, TempK);
    Source.X += P * cie_1931_std_colorimetric_observer[i].xyz.X;
    Source.Y += P * cie_1931_std_colorimetric_observer[i].xyz.Y;
    Source.Z += P * cie_1931_std_colorimetric_observer[i].xyz.Z;
  }
 
  // normalize so that each component is in [0.0, 1.0] range
  const double _max = fmax(fmax(Source.X, Source.Y), Source.Z);
  Source.X /= _max;
  Source.Y /= _max;
  Source.Z /= _max;
 
  return Source;
}
 
// TODO: temperature and tint cannot be disjoined! (here it assumes no tint)
static cmsCIEXYZ temperature_to_XYZ(double TempK)
{
  if(TempK < DT_IOP_LOWEST_TEMPERATURE) TempK = DT_IOP_LOWEST_TEMPERATURE;
  if(TempK > DT_IOP_HIGHEST_TEMPERATURE) TempK = DT_IOP_HIGHEST_TEMPERATURE;
 
  if(TempK < INITIALBLACKBODYTEMPERATURE)
  {
    // if temperature is less than 4000K we use blackbody,
    // because there will be no Daylight reference below 4000K...
    return spectrum_to_XYZ(TempK, spd_blackbody);
  }
  else
  {
    return spectrum_to_XYZ(TempK, spd_daylight);
  }
}
 
static cmsCIEXYZ temperature_tint_to_XYZ(double TempK, double tint)
{
  cmsCIEXYZ xyz = temperature_to_XYZ(TempK);
 
  xyz.Y /= tint; // TODO: This is baaad!
 
  return xyz;
}
 
// binary search inversion
static void XYZ_to_temperature(cmsCIEXYZ XYZ, float *TempK, float *tint)
{
  double maxtemp = DT_IOP_HIGHEST_TEMPERATURE, mintemp = DT_IOP_LOWEST_TEMPERATURE;
  cmsCIEXYZ _xyz;
 
  for(*TempK = (maxtemp + mintemp) / 2.0; (maxtemp - mintemp) > 1.0; *TempK = (maxtemp + mintemp) / 2.0)
  {
    _xyz = temperature_to_XYZ(*TempK);
    if(_xyz.Z / _xyz.X > XYZ.Z / XYZ.X)
      maxtemp = *TempK;
    else
      mintemp = *TempK;
  }
 
  *tint = (_xyz.Y / _xyz.X) / (XYZ.Y / XYZ.X); // TODO: Fix this to move orthogonally to planckian locus
 
 
  if(*TempK < DT_IOP_LOWEST_TEMPERATURE) *TempK = DT_IOP_LOWEST_TEMPERATURE;
  if(*TempK > DT_IOP_HIGHEST_TEMPERATURE) *TempK = DT_IOP_HIGHEST_TEMPERATURE;
  if(*tint < DT_IOP_LOWEST_TINT) *tint = DT_IOP_LOWEST_TINT;
  if(*tint > DT_IOP_HIGHEST_TINT) *tint = DT_IOP_HIGHEST_TINT;
}
 
static void xyz2mul(dt_iop_module_t *self, cmsCIEXYZ xyz, double mul[4])
{
  dt_iop_temperature_gui_data_t *g = (dt_iop_temperature_gui_data_t *)self->gui_data;
 
  double XYZ[3] = { xyz.X, xyz.Y, xyz.Z };
 
  double CAM[4];
  for(int k = 0; k < 4; k++)
  {
    CAM[k] = 0.0;
    for(int i = 0; i < 3; i++)
    {
      CAM[k] += g->XYZ_to_CAM[k][i] * XYZ[i];
    }
  }
 
  for(int k = 0; k < 4; k++) mul[k] = 1.0 / CAM[k];
}
 
static void temp2mul(dt_iop_module_t *self, double TempK, double tint, double mul[4])
{
  cmsCIEXYZ xyz = temperature_to_XYZ(TempK);
 
  xyz.Y /= tint; // TODO: This is baaad!
  xyz2mul(self, xyz, mul);
}
 
static cmsCIEXYZ mul2xyz(dt_iop_module_t *self, const dt_iop_temperature_params_t *p)
{
  dt_iop_temperature_gui_data_t *g = (dt_iop_temperature_gui_data_t *)self->gui_data;
 
  double CAM[4];
  _temp_array_from_params(CAM, p);
  for(int k = 0; k < 4; k++) CAM[k] = CAM[k] > 0.0f ? 1.0 / CAM[k] : 0.0f;
 
  double XYZ[3];
  for(int k = 0; k < 3; k++)
  {
    XYZ[k] = 0.0;
    for(int i = 0; i < 4; i++)
    {
      XYZ[k] += g->CAM_to_XYZ[k][i] * CAM[i];
    }
  }
 
  return (cmsCIEXYZ){ XYZ[0], XYZ[1], XYZ[2] };
}
 
static void mul2temp(dt_iop_module_t *self, dt_iop_temperature_params_t *p, float *TempK, float *tint)
{
  XYZ_to_temperature(mul2xyz(self, p), TempK, tint);
}
 
__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_out = &piece->roi_out;
  const uint32_t filters = piece->dsc_in.filters;
  const uint8_t(*const xtrans)[6] = (const uint8_t(*const)[6])piece->dsc_in.xtrans;
  const dt_iop_temperature_data_t *const d = (dt_iop_temperature_data_t *)piece->data;
  const int width = roi_out->width;
  const int height = roi_out->height;
 
  const float *const in = (const float *const)ivoid;
  float *const out = (float *const)ovoid;
  const float *const d_coeffs = d->coeffs;
 
  if(filters == 9u)
  { // xtrans float mosaiced
    __OMP_PARALLEL_FOR__()
    for(int j = 0; j < height; j++)
    {
      const size_t row_start = (size_t)j * width;
      const float coeffs[12] =
      {
        d_coeffs[FCxtrans(j, 0, roi_out, xtrans)], d_coeffs[FCxtrans(j, 1, roi_out, xtrans)],
        d_coeffs[FCxtrans(j, 2, roi_out, xtrans)], d_coeffs[FCxtrans(j, 3, roi_out, xtrans)],
        d_coeffs[FCxtrans(j, 4, roi_out, xtrans)], d_coeffs[FCxtrans(j, 5, roi_out, xtrans)],
        d_coeffs[FCxtrans(j, 6, roi_out, xtrans)], d_coeffs[FCxtrans(j, 7, roi_out, xtrans)],
        d_coeffs[FCxtrans(j, 8, roi_out, xtrans)], d_coeffs[FCxtrans(j, 9, roi_out, xtrans)],
        d_coeffs[FCxtrans(j, 10, roi_out, xtrans)], d_coeffs[FCxtrans(j, 11, roi_out, xtrans)],
      };
      /* Keep the 12-sensel X-Trans period explicit, but let the compiler pick
         its own vectorization strategy on the scalar multiplies. */
      int i = 0;
      for(; i + 11 < width; i += 12)
      {
        const size_t p = row_start + i;
        out[p + 0] = in[p + 0] * coeffs[0];
        out[p + 1] = in[p + 1] * coeffs[1];
        out[p + 2] = in[p + 2] * coeffs[2];
        out[p + 3] = in[p + 3] * coeffs[3];
        out[p + 4] = in[p + 4] * coeffs[4];
        out[p + 5] = in[p + 5] * coeffs[5];
        out[p + 6] = in[p + 6] * coeffs[6];
        out[p + 7] = in[p + 7] * coeffs[7];
        out[p + 8] = in[p + 8] * coeffs[8];
        out[p + 9] = in[p + 9] * coeffs[9];
        out[p + 10] = in[p + 10] * coeffs[10];
        out[p + 11] = in[p + 11] * coeffs[11];
      }
      for(; i < width; i++)
      {
        const size_t p = row_start + i;
        out[p] = in[p] * coeffs[i % 12];
      }
    }
    
  }
  else if(filters)
  { // bayer float mosaiced
    const int cfa_x = roi_out->x & 1;
    __OMP_PARALLEL_FOR__()
    for(int j = 0; j < height; j++)
    {
      const int offset_j = j + roi_out->y;
      const size_t row_start = (size_t)j * width;
      const int id0 = FC(offset_j, cfa_x + 0, filters);
      const int id1 = FC(offset_j, cfa_x + 1, filters);
      const float coeff0 = d_coeffs[id0];
      const float coeff1 = d_coeffs[id1];
      int i = 0;
 
      for(; i + 1 < width; i += 2)
      {
        const size_t p = row_start + i;
        out[p + 0] = in[p + 0] * coeff0;
        out[p + 1] = in[p + 1] * coeff1;
      }
      for(; i < width; i++)
      {
        const size_t p = row_start + i;
        out[p] = in[p] * d_coeffs[FC(offset_j, i + roi_out->x, filters)];
      }
    }
    
  }
  else
  { // non-mosaiced
    const size_t ch = piece->dsc_in.channels;
    const size_t npixels = (size_t)roi_out->width * roi_out->height;
 
    if(ch == 4)
    {
      __OMP_PARALLEL_FOR__()
      for(size_t k = 0; k < npixels; k++)
      {
        const size_t p = 4 * k;
        out[p + 0] = in[p + 0] * d->coeffs[0];
        out[p + 1] = in[p + 1] * d->coeffs[1];
        out[p + 2] = in[p + 2] * d->coeffs[2];
        out[p + 3] = in[p + 3];
      }
      
    }
    else
    {
      __OMP_PARALLEL_FOR__()
      for(size_t k = 0; k < ch * npixels; k += ch)
      {
        for(ptrdiff_t c = 0; c < 3; c++)
        {
          const size_t p = k + c;
          out[p] = in[p] * d->coeffs[c];
        }
      }
      
    }
 
    if(pipe->mask_display & DT_DEV_PIXELPIPE_DISPLAY_MASK)
      dt_iop_alpha_copy(ivoid, ovoid, roi_out->width, roi_out->height);
  }
 
  return 0;
}
 
#ifdef HAVE_OPENCL
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;
  const dt_iop_roi_t *const roi_out = &piece->roi_out;
  dt_iop_temperature_data_t *d = (dt_iop_temperature_data_t *)piece->data;
  dt_iop_temperature_global_data_t *gd = (dt_iop_temperature_global_data_t *)self->global_data;
 
  const int devid = pipe->devid;
  const uint32_t filters = piece->dsc_in.filters;
  cl_mem dev_coeffs = NULL;
  cl_mem dev_xtrans = NULL;
  cl_int err = -999;
  int kernel = -1;
 
  if(filters == 9u)
  {
    kernel = gd->kernel_whitebalance_1f_xtrans;
  }
  else if(filters)
  {
    kernel = gd->kernel_whitebalance_1f;
  }
  else
  {
    kernel = gd->kernel_whitebalance_4f;
  }
 
  if(filters == 9u)
  {
    dev_xtrans = dt_opencl_copy_host_to_device_constant(devid, sizeof(piece->dsc_in.xtrans), (void *)piece->dsc_in.xtrans);
    if(IS_NULL_PTR(dev_xtrans)) goto error;
  }
 
  dev_coeffs = dt_opencl_copy_host_to_device_constant(devid, sizeof(float) * 3, d->coeffs);
  if(IS_NULL_PTR(dev_coeffs)) goto error;
 
  const int width = roi_in->width;
  const int height = roi_in->height;
 
  size_t sizes[] = { ROUNDUPDWD(width, devid), ROUNDUPDHT(height, devid), 1 };
  dt_opencl_set_kernel_arg(devid, kernel, 0, sizeof(cl_mem), (void *)&dev_in);
  dt_opencl_set_kernel_arg(devid, kernel, 1, sizeof(cl_mem), (void *)&dev_out);
  dt_opencl_set_kernel_arg(devid, kernel, 2, sizeof(int), (void *)&width);
  dt_opencl_set_kernel_arg(devid, kernel, 3, sizeof(int), (void *)&height);
  dt_opencl_set_kernel_arg(devid, kernel, 4, sizeof(cl_mem), (void *)&dev_coeffs);
  dt_opencl_set_kernel_arg(devid, kernel, 5, sizeof(uint32_t), (void *)&filters);
  dt_opencl_set_kernel_arg(devid, kernel, 6, sizeof(uint32_t), (void *)&roi_out->x);
  dt_opencl_set_kernel_arg(devid, kernel, 7, sizeof(uint32_t), (void *)&roi_out->y);
  dt_opencl_set_kernel_arg(devid, kernel, 8, sizeof(cl_mem), (void *)&dev_xtrans);
  err = dt_opencl_enqueue_kernel_2d(devid, kernel, sizes);
  if(err != CL_SUCCESS) goto error;
 
  dt_opencl_release_mem_object(dev_coeffs);
  dt_opencl_release_mem_object(dev_xtrans);
 
  return TRUE;
 
error:
  dt_opencl_release_mem_object(dev_coeffs);
  dt_opencl_release_mem_object(dev_xtrans);
  dt_print(DT_DEBUG_OPENCL, "[opencl_white_balance] couldn't enqueue kernel! %d\n", err);
  return FALSE;
}
#endif
 
gboolean force_enable(struct dt_iop_module_t *self, const gboolean current_state)
{
  // History sanitization: white balance has nothing to balance on a true monochrome sensor, so a
  // WB entry pasted onto a monochrome image is forced off here, at history-read time. For every
  // other image (including non-raw, where manual WB is allowed) the user's state is preserved.
  // This mirrors reload_defaults(), which hides the on/off button for monochrome images.
  const gboolean mono = dt_image_is_monochrome(&self->dev->image_storage);
  const gboolean state = current_state && !mono;
  dt_iop_fmt_log(self, "force_enable: class=%s mono=%d current=%d -> %d",
                 dt_image_pipe_class_name(dt_image_pipe_class(&self->dev->image_storage)),
                 mono, current_state, state);
  return state;
}
 
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_temperature_params_t *p = (dt_iop_temperature_params_t *)p1;
  dt_iop_temperature_data_t *d = (dt_iop_temperature_data_t *)piece->data;
  dt_iop_temperature_gui_data_t *g = (dt_iop_temperature_gui_data_t *)self->gui_data;
 
  d->coeffs[0] = p->red;
  d->coeffs[1] = p->green;
  d->coeffs[2] = p->blue;
  // Legacy-history / non-4-colour safety net: older edits may have stored g2 = NaN (the historical
  // "usually NAN for RGB" second-green value, see find_coeffs). A NaN/0 multiplier would poison
  // half the green CFA sites, so fall back to the first green when g2 isn't a usable number.
  const gboolean g2_usable = isnormal(p->g2) || (self->dev->image_storage.flags & DT_IMAGE_4BAYER);
  d->coeffs[3] = g2_usable ? p->g2 : p->green;
  dt_iop_fmt_log(self, "commit: class=%s matrix_supported=%d coeffs=[%.4f %.4f %.4f %.4f] g2_in=%.4f g2_usable=%d -> enabled=%d",
                 dt_image_pipe_class_name(dt_image_pipe_class(&self->dev->image_storage)),
                 dt_image_is_matrix_correction_supported(&self->dev->image_storage),
                 d->coeffs[0], d->coeffs[1], d->coeffs[2], d->coeffs[3], p->g2, g2_usable, piece->enabled);
  for(int k = 0; k < 4; k++) self->dev->proxy.wb_coeffs[k] = d->coeffs[k];
  piece->dsc_out.temperature.enabled = 1;
  for(int k = 0; k < 4; k++)
  {
    piece->dsc_out.temperature.coeffs[k] = d->coeffs[k];
    piece->dsc_out.processed_maximum[k] = piece->dsc_in.processed_maximum[k] * d->coeffs[k];
  }
 
  // 4Bayer images not implemented in OpenCL yet
  if(self->dev->image_storage.flags & DT_IMAGE_4BAYER) piece->process_cl_ready = 0;
 
  if(!IS_NULL_PTR(g))
  {
    // advertise on the pipe if coeffs are D65 for validity check
    gboolean is_D65 = TRUE;
    for(int c = 0; c < 3; c++)
      if(d->coeffs[c] != (float)g->daylight_wb[c]) is_D65 = FALSE;
 
    self->dev->proxy.wb_is_D65 = is_D65;
  }
}
 
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_temperature_data_t));
  piece->data_size = sizeof(dt_iop_temperature_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 color_rgb_sliders(struct dt_iop_module_t *self)
{
  dt_iop_temperature_gui_data_t *g = (dt_iop_temperature_gui_data_t *)self->gui_data;
 
  const gboolean color_rgb = g->colored_sliders &&
                             !(self->dev->image_storage.flags & DT_IMAGE_4BAYER);
 
  dt_bauhaus_slider_clear_stops(g->scale_r);
  dt_bauhaus_slider_clear_stops(g->scale_g);
  dt_bauhaus_slider_clear_stops(g->scale_b);
  dt_bauhaus_slider_clear_stops(g->scale_g2);
  dt_bauhaus_slider_set_feedback(g->scale_r, !color_rgb);
  dt_bauhaus_slider_set_feedback(g->scale_g, !color_rgb);
  dt_bauhaus_slider_set_feedback(g->scale_b, !color_rgb);
  dt_bauhaus_slider_set_feedback(g->scale_g2, !color_rgb);
 
  if(!color_rgb) return;
 
  // there are 3 ways to do colored sliders: naive (independent 0->1), smart(er) (dependent 0->1) and real (coeff)
 
  if(FALSE)
  {
  //naive:
    dt_bauhaus_slider_set_stop(g->scale_r, 0.0, 0.0, 0.0, 0.0);
    dt_bauhaus_slider_set_stop(g->scale_r, 1.0, 1.0, 0.0, 0.0);
 
    dt_bauhaus_slider_set_stop(g->scale_g, 0.0, 0.0, 0.0, 0.0);
    dt_bauhaus_slider_set_stop(g->scale_g, 1.0, 0.0, 1.0, 0.0);
 
    dt_bauhaus_slider_set_stop(g->scale_b, 0.0, 0.0, 0.0, 0.0);
    dt_bauhaus_slider_set_stop(g->scale_b, 1.0, 0.0, 0.0, 1.0);
 
    dt_bauhaus_slider_set_stop(g->scale_g2, 0.0, 0.0, 0.0, 0.0);
    dt_bauhaus_slider_set_stop(g->scale_g2, 1.0, 0.0, 1.0, 0.0);
  }
  if(!g->blackbody_is_confusing)
  {
    //smart(er) than naive
    const float rchan = dt_bauhaus_slider_get(g->scale_r) / dt_bauhaus_slider_get_hard_max(g->scale_r);
    const float gchan = dt_bauhaus_slider_get(g->scale_g) / dt_bauhaus_slider_get_hard_max(g->scale_g);
    const float bchan = dt_bauhaus_slider_get(g->scale_b) / dt_bauhaus_slider_get_hard_max(g->scale_b);
 
    dt_bauhaus_slider_set_stop(g->scale_r, 0.0, 0.0, gchan, bchan);
    dt_bauhaus_slider_set_stop(g->scale_r, 1.0, 1.0, gchan, bchan);
 
    dt_bauhaus_slider_set_stop(g->scale_g, 0.0, rchan, 0.0, bchan);
    dt_bauhaus_slider_set_stop(g->scale_g, 1.0, rchan, 1.0, bchan);
 
    dt_bauhaus_slider_set_stop(g->scale_b, 0.0, rchan, gchan, 0.0);
    dt_bauhaus_slider_set_stop(g->scale_b, 1.0, rchan, gchan, 1.0);
  }
  else
  {
    //real (ish)
    //we consider daylight wb to be "reference white"
    const double white[3] = {
      1.0/g->daylight_wb[0],
      1.0/g->daylight_wb[1],
      1.0/g->daylight_wb[2],
    };
 
    const float rchanmul = dt_bauhaus_slider_get(g->scale_r);
    const float rchanmulmax = dt_bauhaus_slider_get_hard_max(g->scale_r);
    const float gchanmul = dt_bauhaus_slider_get(g->scale_g);
    const float gchanmulmax = dt_bauhaus_slider_get_hard_max(g->scale_g);
    const float bchanmul = dt_bauhaus_slider_get(g->scale_b);
    const float bchanmulmax = dt_bauhaus_slider_get_hard_max(g->scale_g);
 
    dt_bauhaus_slider_set_stop(g->scale_r, 0.0, white[0]*0.0, white[1]*gchanmul, white[2]*bchanmul);
    dt_bauhaus_slider_set_stop(g->scale_r, g->daylight_wb[0]/rchanmulmax, white[0]*g->daylight_wb[0], white[1]*gchanmul, white[2]*bchanmul);
    dt_bauhaus_slider_set_stop(g->scale_r, 1.0, white[0]*1.0, white[1]*(gchanmul/gchanmulmax), white[2]*(bchanmul/bchanmulmax));
 
    dt_bauhaus_slider_set_stop(g->scale_g, 0.0, white[0]*rchanmul, white[1]*0.0, white[2]*bchanmul);
    dt_bauhaus_slider_set_stop(g->scale_g, g->daylight_wb[1]/bchanmulmax, white[0]*rchanmul, white[1]*g->daylight_wb[1], white[2]*bchanmul);
    dt_bauhaus_slider_set_stop(g->scale_g, 1.0, white[0]*(rchanmul/rchanmulmax), white[1]*1.0, white[2]*(bchanmul/bchanmulmax));
 
    dt_bauhaus_slider_set_stop(g->scale_b, 0.0, white[0]*rchanmul, white[1]*gchanmul, white[2]*0.0);
    dt_bauhaus_slider_set_stop(g->scale_b, g->daylight_wb[2]/bchanmulmax, white[0]*rchanmul, white[1]*gchanmul, white[2]*g->daylight_wb[2]);
    dt_bauhaus_slider_set_stop(g->scale_b, 1.0, white[0]*(rchanmul/rchanmulmax), white[1]*(gchanmul/gchanmulmax), white[2]*1.0);
  }
 
  if(gtk_widget_get_visible(GTK_WIDGET(g->scale_r)))
  {
    gtk_widget_queue_draw(GTK_WIDGET(g->scale_r));
    gtk_widget_queue_draw(GTK_WIDGET(g->scale_g));
    gtk_widget_queue_draw(GTK_WIDGET(g->scale_b));
  }
}
 
void color_temptint_sliders(struct dt_iop_module_t *self)
{
  dt_iop_temperature_gui_data_t *g = (dt_iop_temperature_gui_data_t *)self->gui_data;
 
  dt_bauhaus_slider_clear_stops(g->scale_k);
  dt_bauhaus_slider_clear_stops(g->scale_tint);
  dt_bauhaus_slider_set_feedback(g->scale_k, !g->colored_sliders);
  dt_bauhaus_slider_set_feedback(g->scale_tint, !g->colored_sliders);
 
  if(!g->colored_sliders) return;
 
  const double temp_step = (double)(DT_IOP_HIGHEST_TEMPERATURE - DT_IOP_LOWEST_TEMPERATURE) / (DT_BAUHAUS_SLIDER_MAX_STOPS - 1.0);
  const double tint_step = (double)(DT_IOP_HIGHEST_TINT - DT_IOP_LOWEST_TINT) / (DT_BAUHAUS_SLIDER_MAX_STOPS - 1.0);
  const int blackbody_is_confusing = g->blackbody_is_confusing;
 
  const float cur_temp = dt_bauhaus_slider_get(g->scale_k);
  const float cur_tint = dt_bauhaus_slider_get(g->scale_tint);
 
  //we consider daylight wb to be "reference white"
  const double dayligh_white[3] = {
    1.0/g->daylight_wb[0],
    1.0/g->daylight_wb[1],
    1.0/g->daylight_wb[2],
  };
 
  double cur_coeffs[4] = {0.0};
  temp2mul(self, cur_temp, 1.0, cur_coeffs);
  const double cur_white[3] = {
    1.0/cur_coeffs[0],
    1.0/cur_coeffs[1],
    1.0/cur_coeffs[2],
  };
 
  if(blackbody_is_confusing)
  {
    // show effect of adjustment on temp/tint sliders
    for(int i = 0; i < DT_BAUHAUS_SLIDER_MAX_STOPS; i++)
    {
      const float stop = i / (DT_BAUHAUS_SLIDER_MAX_STOPS - 1.0);
      const double K = DT_IOP_LOWEST_TEMPERATURE + i * temp_step;
      const double tint = DT_IOP_LOWEST_TINT + i * tint_step;
 
      double coeffs_K[4];
      double coeffs_tint[4];
      temp2mul(self, K, cur_tint, coeffs_K);
      temp2mul(self, cur_temp, tint, coeffs_tint);
      coeffs_K[0] /= coeffs_K[1];
      coeffs_K[2] /= coeffs_K[1];
      coeffs_K[3] /= coeffs_K[1];
      coeffs_K[1] = 1.0;
      coeffs_tint[0] /= coeffs_tint[1];
      coeffs_tint[2] /= coeffs_tint[1];
      coeffs_tint[3] /= coeffs_tint[1];
      coeffs_tint[1] = 1.0;
 
      dt_aligned_pixel_t sRGB_K = { dayligh_white[0]*coeffs_K[0], dayligh_white[1]*coeffs_K[1],
                                    dayligh_white[2]*coeffs_K[2] };
      dt_aligned_pixel_t sRGB_tint = {cur_white[0]*coeffs_tint[0], cur_white[1]*coeffs_tint[1],
                                      cur_white[2]*coeffs_tint[2]};
      const float maxsRGB_K = fmaxf(fmaxf(sRGB_K[0], sRGB_K[1]), sRGB_K[2]);
      const float maxsRGB_tint = fmaxf(fmaxf(sRGB_tint[0], sRGB_tint[1]),sRGB_tint[2]);
 
      if(maxsRGB_K > 1.f)
      {
        for(int ch=0; ch<3; ch++)
        {
          sRGB_K[ch] = fmaxf(sRGB_K[ch] / maxsRGB_K, 0.f);
        }
      }
      if(maxsRGB_tint > 1.f)
      {
        for(int ch=0; ch<3; ch++)
        {
          sRGB_tint[ch] = fmaxf(sRGB_tint[ch] / maxsRGB_tint, 0.f);
        }
      }
      dt_bauhaus_slider_set_stop(g->scale_k, stop, sRGB_K[0], sRGB_K[1], sRGB_K[2]);
      dt_bauhaus_slider_set_stop(g->scale_tint, stop, sRGB_tint[0], sRGB_tint[1], sRGB_tint[2]);
    }
  }
  else
  {
    // reflect actual black body colors for the temperature slider
    for(int i = 0; i < DT_BAUHAUS_SLIDER_MAX_STOPS; i++)
    {
      const float stop = i / (DT_BAUHAUS_SLIDER_MAX_STOPS - 1.0);
      const double K = DT_IOP_LOWEST_TEMPERATURE + i * temp_step;
      const double tint = DT_IOP_LOWEST_TINT + i * tint_step;
 
      const cmsCIEXYZ cmsXYZ_temp = temperature_tint_to_XYZ(K,cur_tint);
      const cmsCIEXYZ cmsXYZ_tint = temperature_tint_to_XYZ(cur_temp, tint);
      dt_aligned_pixel_t XYZ_temp = {cmsXYZ_temp.X, cmsXYZ_temp.Y, cmsXYZ_temp.Z};
      dt_aligned_pixel_t XYZ_tint = {cmsXYZ_tint.X, cmsXYZ_tint.Y, cmsXYZ_tint.Z};
      dt_aligned_pixel_t sRGB_temp;
      dt_aligned_pixel_t sRGB_tint;
 
      dt_XYZ_to_Rec709_D65(XYZ_temp, sRGB_temp);
      dt_XYZ_to_Rec709_D65(XYZ_tint, sRGB_tint);
 
      const float maxsRGB_temp = fmaxf(fmaxf(sRGB_temp[0], sRGB_temp[1]), sRGB_temp[2]);
      const float maxsRGB_tint = fmaxf(fmaxf(sRGB_tint[0], sRGB_tint[1]), sRGB_tint[2]);
 
      if(maxsRGB_temp > 1.f)
      {
        for(int ch=0; ch<3; ch++)
        {
          sRGB_temp[ch] = fmaxf(sRGB_temp[ch] / maxsRGB_temp, 0.f);
        }
      }
 
      if(maxsRGB_tint > 1.f)
      {
        for(int ch=0; ch<3; ch++)
        {
          sRGB_tint[ch] = fmaxf(sRGB_tint[ch] / maxsRGB_tint, 0.f);
        }
      }
 
      dt_bauhaus_slider_set_stop(g->scale_k, stop, sRGB_temp[0], sRGB_temp[1], sRGB_temp[2]);
      dt_bauhaus_slider_set_stop(g->scale_tint, stop, sRGB_tint[0], sRGB_tint[1], sRGB_tint[2]);
    }
  }
 
  if(gtk_widget_get_visible(GTK_WIDGET(g->scale_k)))
  {
    gtk_widget_queue_draw(GTK_WIDGET(g->scale_k));
    gtk_widget_queue_draw(GTK_WIDGET(g->scale_tint));
  }
}
 
 
void gui_update(struct dt_iop_module_t *self)
{
  dt_iop_temperature_gui_data_t *g = (dt_iop_temperature_gui_data_t *)self->gui_data;
  dt_iop_temperature_params_t *p = (dt_iop_temperature_params_t *)self->params;
 
  const gboolean monochrome = dt_image_is_monochrome(&self->dev->image_storage);
  const gboolean is_raw = dt_image_is_matrix_correction_supported(&self->dev->image_storage);
  self->hide_enable_button = monochrome;
  self->default_enabled = is_raw;
  gtk_stack_set_visible_child_name(GTK_STACK(self->widget), self->hide_enable_button ? "disabled" : "enabled");
 
//  if(self->hide_enable_button) return;
 
  dt_iop_color_picker_reset(self, TRUE);
 
  float tempK, tint;
  mul2temp(self, p, &tempK, &tint);
 
  dt_bauhaus_slider_set(g->scale_k, tempK);
  dt_bauhaus_slider_set(g->scale_tint, tint);
  dt_bauhaus_slider_set(g->scale_r, p->red);
  dt_bauhaus_slider_set(g->scale_g, p->green);
  dt_bauhaus_slider_set(g->scale_b, p->blue);
  dt_bauhaus_slider_set(g->scale_g2, p->g2);
 
  dt_bauhaus_combobox_set(g->presets, -1);
  
  gboolean found = FALSE;
 
  // is this a "as shot" white balance?
  if(p->red == g->as_shot_wb[0] && p->green == g->as_shot_wb[1] && p->blue == g->as_shot_wb[2])
  {
    dt_bauhaus_combobox_set(g->presets, DT_IOP_TEMP_AS_SHOT);
    found = TRUE;
  }
  else
  {
    // is this a "D65 white balance"?
    if((p->red == (float)g->daylight_wb[0]) &&
       (p->green == (float)g->daylight_wb[1]) &&
       (p->blue == (float)g->daylight_wb[2]))
    {
      dt_bauhaus_combobox_set(g->presets, DT_IOP_TEMP_D65);
      found = TRUE;
    }
  }
 
  if(!found)
    dt_bauhaus_combobox_set(g->presets, DT_IOP_TEMP_USER);
 
  if (!found || isnan(g->mod_temp)) // reset or initialize user-defined
  {
    g->mod_temp = tempK;
    g->mod_tint = tint;
    _temp_array_from_params(g->mod_coeff, p);
  }
 
  gtk_widget_set_visible(g->buttonbar, g->button_bar_visible);
 
  const int preset = dt_bauhaus_combobox_get(g->presets);
 
  gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(g->btn_asshot), preset == DT_IOP_TEMP_AS_SHOT);
  gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(g->btn_user), preset == DT_IOP_TEMP_USER);
  gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(g->btn_d65), preset == DT_IOP_TEMP_D65);
 
  color_temptint_sliders(self);
  color_rgb_sliders(self);
 
  dt_gui_update_collapsible_section(&g->cs);
 
  gtk_widget_queue_draw(self->widget);
}
 
static int calculate_bogus_daylight_wb(dt_iop_module_t *module, double bwb[4])
{
  if(!dt_image_is_matrix_correction_supported(&module->dev->image_storage))
  {
    bwb[0] = 1.0;
    bwb[2] = 1.0;
    bwb[1] = 1.0;
    bwb[3] = 1.0;
 
    return 0;
  }
 
  double mul[4];
  if(dt_colorspaces_conversion_matrices_rgb(module->dev->image_storage.adobe_XYZ_to_CAM,
                                            NULL, NULL,
                                            module->dev->image_storage.d65_color_matrix, mul))
  {
    // normalize green:
    bwb[0] = mul[0] / mul[1];
    bwb[2] = mul[2] / mul[1];
    bwb[1] = 1.0;
    bwb[3] = mul[3] / mul[1];
 
    return 0;
  }
 
  return 1;
}
 
static void prepare_matrices(dt_iop_module_t *module)
{
  dt_iop_temperature_gui_data_t *g = (dt_iop_temperature_gui_data_t *)module->gui_data;
 
  // sRGB D65
  const double RGB_to_XYZ[3][4] = { { 0.4124564, 0.3575761, 0.1804375, 0 },
                                    { 0.2126729, 0.7151522, 0.0721750, 0 },
                                    { 0.0193339, 0.1191920, 0.9503041, 0 } };
 
  // sRGB D65
  const double XYZ_to_RGB[4][3] = { { 3.2404542, -1.5371385, -0.4985314 },
                                    { -0.9692660, 1.8760108, 0.0415560 },
                                    { 0.0556434, -0.2040259, 1.0572252 },
                                    { 0, 0, 0 } };
 
  if(!dt_image_needs_rawprepare(&module->dev->image_storage))
  {
    // let's just assume for now(TM) that if it has no raw colorimetry, it is sRGB.
    // Gate on the colorimetry axis (raw or sRAW), not on the mosaic-only "raw" flag, otherwise
    // an already-demosaiced raw (sRAW / linear DNG) would skip its camera matrix here (issue #729).
    memcpy(g->XYZ_to_CAM, XYZ_to_RGB, sizeof(g->XYZ_to_CAM));
    memcpy(g->CAM_to_XYZ, RGB_to_XYZ, sizeof(g->CAM_to_XYZ));
    return;
  }
 
  if (!dt_colorspaces_conversion_matrices_xyz(module->dev->image_storage.adobe_XYZ_to_CAM,
                                              module->dev->image_storage.d65_color_matrix,
                                              g->XYZ_to_CAM, g->CAM_to_XYZ))
  {
    char *camera = module->dev->image_storage.camera_makermodel;
    fprintf(stderr, "[temperature] `%s' color matrix not found for image\n", camera);
    dt_control_log(_("`%s' color matrix not found for image"), camera);
  }
}
 
static void find_coeffs(dt_iop_module_t *module, double coeffs[4])
{
  const dt_image_t *img = &module->dev->image_storage;
 
  // the raw should provide wb coeffs:
  int ok = 1;
  // Only check the first three values, the fourth is usually NAN for RGB
  const int num_coeffs = (img->flags & DT_IMAGE_4BAYER) ? 4 : 3;
  for(int k = 0; ok && k < num_coeffs; k++)
  {
    if(!isnormal(img->wb_coeffs[k]) || img->wb_coeffs[k] == 0.0f) ok = 0;
  }
  if(ok)
  {
    for(int k = 0; k < 4; k++) coeffs[k] = img->wb_coeffs[k];
    // wb_coeffs[3] is the SECOND green multiplier. For non-4-colour sensors (standard RGGB Bayer,
    // X-Trans) both green sites physically share the first green's multiplier, and many decoders
    // legitimately leave wb_coeffs[3] as NaN or 0 (see the "usually NAN for RGB" note above, and
    // the rawspeed DngDecoder which only fills 3 planes). Mirror coeffs[1] when the fourth value
    // is not a usable number, so we never propagate NaN into the G2 sites of the CFA.
    if(!(img->flags & DT_IMAGE_4BAYER) && !isnormal(coeffs[3])) coeffs[3] = coeffs[1];
    return;
  }
 
  if(!ignore_missing_wb(&(module->dev->image_storage)))
  {
    //  only display this if we have a sample, otherwise it is better to keep
    //  on screen the more important message about missing sample and the way
    //  to contribute.
    if(!img->camera_missing_sample)
      dt_control_log(_("failed to read camera white balance information from `%s'!"),
                     img->filename);
    fprintf(stderr, "[temperature] failed to read camera white balance information from `%s'!\n",
            img->filename);
  }
 
  double bwb[4];
  if(!calculate_bogus_daylight_wb(module, bwb))
  {
    // found camera matrix and used it to calculate bogus daylight wb
    for(int c = 0; c < 4; c++) coeffs[c] = bwb[c];
    return;
  }
 
  // did not find preset either?
  // final security net: hardcoded default that fits most cams.
  coeffs[0] = 2.0;
  coeffs[1] = 1.0;
  coeffs[2] = 1.5;
  coeffs[3] = 1.0;
}
 
void reload_defaults(dt_iop_module_t *module)
{
  dt_iop_temperature_params_t *d = module->default_params;
  *d = (dt_iop_temperature_params_t){ 1.0, 1.0, 1.0, 1.0 };
 
  // we might be called from presets update infrastructure => there is no image
  if(!module->dev || module->dev->image_storage.id == -1) return;
 
  const gboolean is_raw = dt_image_is_matrix_correction_supported(&module->dev->image_storage);
  const gboolean monochrome = dt_image_is_monochrome(&module->dev->image_storage);
 
  // Note : this is not an user param anymore, and is set to modern by default
  // except for old histories using temperature without having an history entry for it.
  // see develop/develop.c/_dev_auto_apply_presets()
  const gboolean is_modern =
    dt_conf_is_equal("plugins/darkroom/chromatic-adaptation", "modern");
 
  module->default_enabled = 0;
  module->hide_enable_button = 0;
 
  // White balance module doesn't need to be enabled for monochrome raws (like
  // for leica monochrom cameras). prepare_matrices is a noop as well, as there
  // isn't a color matrix, so we can skip that as well.
  if(monochrome)
  {
    module->hide_enable_button = 1;
  }
  else
  {
    if(module->gui_data) prepare_matrices(module);
 
    /* check if file is raw / hdr */
    if(is_raw)
    {
      // raw images need wb:
      module->default_enabled = 1;
 
      // if workflow = modern, only set WB coeffs equivalent to D65 illuminant
      // full chromatic adaptation is deferred to channelmixerrgb
      double coeffs[4] = { 0 };
      if(is_modern && !calculate_bogus_daylight_wb(module, coeffs))
      {
        d->red = coeffs[0]/coeffs[1];
        d->blue = coeffs[2]/coeffs[1];
        d->g2 = coeffs[3]/coeffs[1];
        d->green = 1.0f;
      }
      else
      {
        // do best to find starting coeffs
        find_coeffs(module, coeffs);
        d->red = coeffs[0]/coeffs[1];
        d->blue = coeffs[2]/coeffs[1];
        d->g2 = coeffs[3]/coeffs[1];
        d->green = 1.0f;
      }
    }
  }
 
  dt_iop_fmt_log(module, "reload_defaults: class=%s matrix_supported=%d mono=%d modern=%d -> default_enabled=%d coeffs=[%.4f %.4f %.4f %.4f]",
                 dt_image_pipe_class_name(dt_image_pipe_class(&module->dev->image_storage)),
                 is_raw, monochrome, is_modern, module->default_enabled, d->red, d->green, d->blue, d->g2);
 
  // remember daylight wb used for temperature/tint conversion,
  // assuming it corresponds to CIE daylight (D65)
  dt_iop_temperature_gui_data_t *g = (dt_iop_temperature_gui_data_t *)module->gui_data;
  if(!IS_NULL_PTR(g))
  {
    gtk_stack_set_visible_child_name(GTK_STACK(module->widget), module->hide_enable_button ? "disabled" : "enabled");
 
    dt_bauhaus_slider_set_default(g->scale_r, d->red);
    dt_bauhaus_slider_set_default(g->scale_g, d->green);
    dt_bauhaus_slider_set_default(g->scale_b, d->blue);
    dt_bauhaus_slider_set_default(g->scale_g2, d->g2);
 
    // to have at least something and definitely not crash
    _temp_array_from_params(g->daylight_wb, d);
 
    calculate_bogus_daylight_wb(module, g->daylight_wb);
 
    // Store EXIF WB coeffs
    if(is_raw)
      find_coeffs(module, g->as_shot_wb);
    else
      g->as_shot_wb[0] = g->as_shot_wb[1] = g->as_shot_wb[2] = g->as_shot_wb[3] = 1.f;
 
    g->as_shot_wb[0] /= g->as_shot_wb[1];
    g->as_shot_wb[2] /= g->as_shot_wb[1];
    g->as_shot_wb[3] /= g->as_shot_wb[1];
    g->as_shot_wb[1] = 1.0;
 
    float TempK, tint;
    mul2temp(module, d, &TempK, &tint);
 
    dt_bauhaus_slider_set_default(g->scale_k, TempK);
    dt_bauhaus_slider_set_default(g->scale_tint, tint);
 
    dt_bauhaus_combobox_clear(g->presets);
 
    dt_bauhaus_combobox_add(g->presets, C_("white balance", "as shot")); // old "camera". reason for change: all other RAW development tools use "As Shot" or "shot"
    dt_bauhaus_combobox_add(g->presets, C_("white balance", "from image area")); // old "spot", reason: describes exactly what'll happen
    dt_bauhaus_combobox_add(g->presets, C_("white balance", "user modified"));
    dt_bauhaus_combobox_add(g->presets, C_("white balance", "camera reference")); // old "camera neutral", reason: better matches intent
 
    g->preset_cnt = DT_IOP_NUM_OF_STD_TEMP_PRESETS;
    memset(g->preset_num, 0, sizeof(g->preset_num));
 
    gui_sliders_update(module);
  }
}
 
void init_global(dt_iop_module_so_t *module)
{
  const int program = 2; // basic.cl, from programs.conf
  dt_iop_temperature_global_data_t *gd
      = (dt_iop_temperature_global_data_t *)malloc(sizeof(dt_iop_temperature_global_data_t));
  module->data = gd;
  gd->kernel_whitebalance_4f = dt_opencl_create_kernel(program, "whitebalance_4f");
  gd->kernel_whitebalance_1f = dt_opencl_create_kernel(program, "whitebalance_1f");
  gd->kernel_whitebalance_1f_xtrans = dt_opencl_create_kernel(program, "whitebalance_1f_xtrans");
}
 
void cleanup_global(dt_iop_module_so_t *module)
{
  dt_iop_temperature_global_data_t *gd = (dt_iop_temperature_global_data_t *)module->data;
  dt_opencl_free_kernel(gd->kernel_whitebalance_4f);
  dt_opencl_free_kernel(gd->kernel_whitebalance_1f);
  dt_opencl_free_kernel(gd->kernel_whitebalance_1f_xtrans);
  dt_free(module->data);
}
 
static void temp_tint_callback(GtkWidget *slider, dt_iop_module_t *self)
{
  if(darktable.gui->reset) return;
 
  dt_iop_temperature_gui_data_t *g = (dt_iop_temperature_gui_data_t *)self->gui_data;
  dt_iop_temperature_params_t *p = (dt_iop_temperature_params_t *)self->params;
 
  dt_iop_color_picker_reset(self, TRUE);
 
  g->mod_temp = dt_bauhaus_slider_get(g->scale_k);
  g->mod_tint = dt_bauhaus_slider_get(g->scale_tint);
 
  temp2mul(self, g->mod_temp, g->mod_tint, g->mod_coeff);
 
  // normalize
  g->mod_coeff[0] /= g->mod_coeff[1];
  g->mod_coeff[2] /= g->mod_coeff[1];
  g->mod_coeff[3] /= g->mod_coeff[1];
  g->mod_coeff[1] = 1.0;
 
  _temp_params_from_array(p, g->mod_coeff);
 
  ++darktable.gui->reset;
  dt_bauhaus_slider_set(g->scale_r, p->red);
  dt_bauhaus_slider_set(g->scale_g, p->green);
  dt_bauhaus_slider_set(g->scale_b, p->blue);
  dt_bauhaus_slider_set(g->scale_g2, p->g2);
  dt_bauhaus_combobox_set(g->presets, DT_IOP_TEMP_USER);
  --darktable.gui->reset;
 
  dt_dev_add_history_item(darktable.develop, self, TRUE, TRUE);
}
 
void gui_changed(dt_iop_module_t *self, GtkWidget *w, void *previous)
{
  dt_iop_temperature_gui_data_t *g = (dt_iop_temperature_gui_data_t *)self->gui_data;
  dt_iop_temperature_params_t *p = (dt_iop_temperature_params_t *)self->params;
 
  _temp_array_from_params(g->mod_coeff, p);
 
  mul2temp(self, p, &g->mod_temp, &g->mod_tint);
 
  dt_bauhaus_combobox_set(g->presets, DT_IOP_TEMP_USER);
}
 
static gboolean btn_toggled(GtkWidget *togglebutton, GdkEventButton *event, dt_iop_module_t *self)
{
  if(darktable.gui->reset) return TRUE;
 
  dt_iop_temperature_gui_data_t *g = (dt_iop_temperature_gui_data_t*)self->gui_data;
 
  int preset = togglebutton == g->btn_asshot ? DT_IOP_TEMP_AS_SHOT :
               togglebutton == g->btn_d65 ? DT_IOP_TEMP_D65 :
               togglebutton == g->btn_user ? DT_IOP_TEMP_USER : 0;
 
  if(!gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(togglebutton)))
  {
    if(dt_bauhaus_combobox_get(g->presets) != preset)
      dt_bauhaus_combobox_set(g->presets, preset);
  }
  else if(dt_bauhaus_combobox_get(g->presets) == preset)
  {
    gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(togglebutton), TRUE);
  }
 
  return TRUE;
}
 
static void preset_tune_callback(GtkWidget *widget, dt_iop_module_t *self)
{
  if(darktable.gui->reset) return;
 
  dt_iop_temperature_gui_data_t *g = (dt_iop_temperature_gui_data_t *)self->gui_data;
  dt_iop_temperature_params_t *p = (dt_iop_temperature_params_t *)self->params;
 
  const int pos = dt_bauhaus_combobox_get(g->presets);
 
  gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(g->btn_asshot), pos == DT_IOP_TEMP_AS_SHOT);
  if(pos != DT_IOP_TEMP_SPOT) dt_iop_color_picker_reset(self, TRUE);
  gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(g->btn_user), pos == DT_IOP_TEMP_USER);
  gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(g->btn_d65), pos == DT_IOP_TEMP_D65);
 
  switch(pos)
  {
    case -1: // just un-setting.
      return;
    case DT_IOP_TEMP_AS_SHOT: // as shot wb
      _temp_params_from_array(p, g->as_shot_wb);
      break;
    case DT_IOP_TEMP_SPOT: // from image area wb, expose callback will set p->rgbg2.
      if(!gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(g->colorpicker)))
      {
        gboolean ret_val;
        g_signal_emit_by_name(G_OBJECT(g->colorpicker), "button-press-event", NULL, &ret_val);
      }
      break;
    case DT_IOP_TEMP_USER: // directly changing one of the coeff sliders also changes the mod_coeff so it can be read here
      _temp_params_from_array(p, g->mod_coeff);
      break;
    case DT_IOP_TEMP_D65: // camera reference d65
      _temp_params_from_array(p, g->daylight_wb);
      break;
    default: // camera WB presets
      break;
  }
 
  if(self->off) gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(self->off), 1);
 
  float TempK, tint;
 
  if(pos == DT_IOP_TEMP_USER)
  {
    TempK = g->mod_temp;
    tint = g->mod_tint;
  }
  else
  {
    mul2temp(self, p, &TempK, &tint);
  }
 
  ++darktable.gui->reset;
  dt_bauhaus_slider_set(g->scale_k, TempK);
  dt_bauhaus_slider_set(g->scale_tint, tint);
  dt_bauhaus_slider_set(g->scale_r, p->red);
  dt_bauhaus_slider_set(g->scale_g, p->green);
  dt_bauhaus_slider_set(g->scale_b, p->blue);
  dt_bauhaus_slider_set(g->scale_g2, p->g2);
  --darktable.gui->reset;
 
  color_temptint_sliders(self);
  color_rgb_sliders(self);
 
  dt_dev_add_history_item(darktable.develop, self, TRUE, TRUE);
}
 
void color_picker_apply(dt_iop_module_t *self, GtkWidget *picker, dt_dev_pixelpipe_t *pipe, dt_dev_pixelpipe_iop_t *piece)
{
  (void)picker;
  (void)pipe;
  (void)piece;
  if(darktable.gui->reset) return;
 
  dt_iop_temperature_gui_data_t *g = (dt_iop_temperature_gui_data_t *)self->gui_data;
  dt_iop_temperature_params_t *p = (dt_iop_temperature_params_t *)self->params;
 
  // capture gui color picked event.
  if(self->picked_color_max[0] < self->picked_color_min[0]) return;
  const float *grayrgb = self->picked_color;
 
  // normalize green:
  p->green = grayrgb[1] > 0.001f ? 1.0f / grayrgb[1] : 1.0f;
  p->red  = fmaxf(0.0f, fminf(8.0f, (grayrgb[0] > 0.001f ? 1.0f / grayrgb[0] : 1.0f) / p->green));
  p->blue = fmaxf(0.0f, fminf(8.0f, (grayrgb[2] > 0.001f ? 1.0f / grayrgb[2] : 1.0f) / p->green));
  p->g2   = fmaxf(0.0f, fminf(8.0f, (grayrgb[3] > 0.001f ? 1.0f / grayrgb[3] : 1.0f) / p->green));
  p->green = 1.0;
 
  ++darktable.gui->reset;
  dt_bauhaus_combobox_set(g->presets, DT_IOP_TEMP_SPOT);
 
  float tempK, tint;
  mul2temp(self, p, &tempK, &tint);
 
  dt_bauhaus_slider_set(g->scale_k, tempK);
  dt_bauhaus_slider_set(g->scale_tint, tint);
  dt_bauhaus_slider_set(g->scale_r, p->red);
  dt_bauhaus_slider_set(g->scale_g, p->green);
  dt_bauhaus_slider_set(g->scale_b, p->blue);
  dt_bauhaus_slider_set(g->scale_g2, p->g2);
 
  dt_bauhaus_combobox_set(g->presets, -1);
  --darktable.gui->reset;
 
  dt_dev_add_history_item(self->dev, self, TRUE, TRUE);
}
 
 
static void gui_sliders_update(struct dt_iop_module_t *self)
{
  const dt_image_t *img = &self->dev->image_storage;
  dt_iop_temperature_gui_data_t *g = (dt_iop_temperature_gui_data_t *)self->gui_data;
 
  if(FILTERS_ARE_CYGM(img->dsc.filters))
  {
    dt_bauhaus_widget_set_label(g->scale_r, N_("green"));
    gtk_widget_set_tooltip_text(g->scale_r, _("green channel coefficient"));
    dt_bauhaus_widget_set_label(g->scale_g, N_("magenta"));
    gtk_widget_set_tooltip_text(g->scale_g, _("magenta channel coefficient"));
    dt_bauhaus_widget_set_label(g->scale_b, N_("cyan"));
    gtk_widget_set_tooltip_text(g->scale_b, _("cyan channel coefficient"));
    dt_bauhaus_widget_set_label(g->scale_g2, N_("yellow"));
    gtk_widget_set_tooltip_text(g->scale_g2, _("yellow channel coefficient"));
 
    gtk_box_reorder_child(GTK_BOX(g->cs.container), g->scale_b, 0);
    gtk_box_reorder_child(GTK_BOX(g->cs.container), g->scale_g2, 1);
    gtk_box_reorder_child(GTK_BOX(g->cs.container), g->scale_g, 2);
    gtk_box_reorder_child(GTK_BOX(g->cs.container), g->scale_r, 3);
  }
  else
  {
    dt_bauhaus_widget_set_label(g->scale_r, N_("red"));
    gtk_widget_set_tooltip_text(g->scale_r, _("red channel coefficient"));
    dt_bauhaus_widget_set_label(g->scale_g, N_("green"));
    gtk_widget_set_tooltip_text(g->scale_g, _("green channel coefficient"));
    dt_bauhaus_widget_set_label(g->scale_b, N_("blue"));
    gtk_widget_set_tooltip_text(g->scale_b, _("blue channel coefficient"));
    dt_bauhaus_widget_set_label(g->scale_g2, N_("emerald"));
    gtk_widget_set_tooltip_text(g->scale_g2, _("emerald channel coefficient"));
 
    gtk_box_reorder_child(GTK_BOX(g->cs.container), g->scale_r, 0);
    gtk_box_reorder_child(GTK_BOX(g->cs.container), g->scale_g, 1);
    gtk_box_reorder_child(GTK_BOX(g->cs.container), g->scale_b, 2);
    gtk_box_reorder_child(GTK_BOX(g->cs.container), g->scale_g2, 3);
  }
 
  gtk_widget_set_visible(GTK_WIDGET(g->scale_g2), (img->flags & DT_IMAGE_4BAYER));
}
 
void gui_init(struct dt_iop_module_t *self)
{
  dt_iop_temperature_gui_data_t *g = IOP_GUI_ALLOC(temperature);
 
  g->colored_sliders = TRUE; // true if config != "no color"
  g->blackbody_is_confusing = FALSE; // true if config != "illuminant color"
 
  const int feedback = TRUE;
  g->button_bar_visible = TRUE;
 
  GtkBox *box_enabled = GTK_BOX(gtk_box_new(GTK_ORIENTATION_VERTICAL, DT_GUI_BOX_SPACING));
 
  g->btn_asshot = dt_iop_togglebutton_new(self, N_("settings"), N_("as shot"), NULL,
                                          G_CALLBACK(btn_toggled), FALSE, 0, 0,
                                          dtgtk_cairo_paint_camera, NULL);
  gtk_widget_set_tooltip_text(g->btn_asshot, _("set white balance to as shot"));
 
  // create color picker to be able to send its signal when spot selected,
  // this module may expect data in RAW or RGB, setting the color picker CST to IOP_CS_NONE will make the color
  // picker to depend on the number of color channels of the pixels. It is done like this as we may not know the
  // actual kind of data we are using in the GUI (it is part of the pipeline).
  g->colorpicker = dt_color_picker_new_with_cst(self, DT_COLOR_PICKER_AREA, NULL, IOP_CS_NONE);
  dtgtk_togglebutton_set_paint(DTGTK_TOGGLEBUTTON(g->colorpicker), dtgtk_cairo_paint_colorpicker, 0, NULL);
 
  gtk_widget_set_tooltip_text(g->colorpicker, _("set white balance to detected from area"));
 
  g->btn_user = dt_iop_togglebutton_new(self, N_("settings"), N_("user modified"), NULL,
                                        G_CALLBACK(btn_toggled), FALSE, 0, 0,
                                        dtgtk_cairo_paint_masks_drawn, NULL);
  gtk_widget_set_tooltip_text(g->btn_user, _("set white balance to user modified"));
 
 
  g->btn_d65 = dt_iop_togglebutton_new(self, N_("settings"), N_("camera reference"), NULL,
                                       G_CALLBACK(btn_toggled), FALSE, 0, 0,
                                       dtgtk_cairo_paint_bulb, NULL);
  gtk_widget_set_tooltip_text(g->btn_d65, _("set white balance to camera reference point\nin most cases it should be D65"));
 
  g->buttonbar = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, DT_GUI_BOX_SPACING); // put buttons at top. fill later.
  dt_gui_add_class(g->buttonbar, "dt_iop_toggle");
  gtk_box_pack_end(GTK_BOX(g->buttonbar), g->btn_d65, TRUE, TRUE, 0);
  gtk_box_pack_end(GTK_BOX(g->buttonbar), g->btn_user, TRUE, TRUE, 0);
  gtk_box_pack_end(GTK_BOX(g->buttonbar), g->colorpicker, TRUE, TRUE, 0);
  gtk_box_pack_end(GTK_BOX(g->buttonbar), g->btn_asshot, TRUE, TRUE, 0);
  gtk_box_pack_start(box_enabled, g->buttonbar, TRUE, TRUE, 0);
 
  g->presets = dt_bauhaus_combobox_new(darktable.bauhaus, DT_GUI_MODULE(self));
  dt_bauhaus_widget_set_label(g->presets, N_("settings")); // relabel to settings to remove confusion between module presets and white balance settings
  gtk_widget_set_tooltip_text(g->presets, _("choose white balance setting"));
  gtk_box_pack_start(box_enabled, g->presets, TRUE, TRUE, 0);
 
  g->mod_temp = NAN;
  for(int k = 0; k < 4; k++)
  {
    g->daylight_wb[k] = 1.0;
    g->as_shot_wb[k] = 1.f;
  }
 
  GtkWidget *temp_label_box = gtk_event_box_new();
  g->temp_label = dt_ui_section_label_new(_("scene illuminant temp"));
  gtk_widget_set_tooltip_text(g->temp_label, _("click to cycle color mode on sliders"));
  gtk_container_add(GTK_CONTAINER(temp_label_box), g->temp_label);
 
  gtk_box_pack_start(box_enabled, temp_label_box, TRUE, TRUE, 0);
 
  //Match UI order: temp first, then tint (like every other app ever)
  g->scale_k = dt_bauhaus_slider_new_with_range_and_feedback(darktable.bauhaus, DT_GUI_MODULE(self), DT_IOP_LOWEST_TEMPERATURE, DT_IOP_HIGHEST_TEMPERATURE,
                                                             0, 5000.0, 0, feedback);
  dt_bauhaus_slider_set_format(g->scale_k, " K");
  dt_bauhaus_widget_set_label(g->scale_k, N_("temperature"));
  gtk_widget_set_tooltip_text(g->scale_k, _("color temperature (in Kelvin)"));
  gtk_box_pack_start(box_enabled, g->scale_k, TRUE, TRUE, 0);
 
  g->scale_tint = dt_bauhaus_slider_new_with_range_and_feedback(darktable.bauhaus, DT_GUI_MODULE(self), DT_IOP_LOWEST_TINT, DT_IOP_HIGHEST_TINT,
                                                                0, 1.0, 3, feedback);
  dt_bauhaus_widget_set_label(g->scale_tint, N_("tint"));
  gtk_widget_set_tooltip_text(g->scale_tint, _("color tint of the image, from magenta (value < 1) to green (value > 1)"));
  gtk_box_pack_start(box_enabled, g->scale_tint, TRUE, TRUE, 0);
 
  dt_gui_new_collapsible_section
    (&g->cs,
     "plugins/darkroom/temperature/expand_coefficients",
     _("channel coefficients"),
     GTK_BOX(box_enabled), GTK_PACK_END);
 
  self->widget = GTK_WIDGET(g->cs.container);
 
  g->scale_r = dt_bauhaus_slider_from_params(self, N_("red"));
  g->scale_g = dt_bauhaus_slider_from_params(self, N_("green"));
  g->scale_b = dt_bauhaus_slider_from_params(self, N_("blue"));
  g->scale_g2 = dt_bauhaus_slider_from_params(self, "g2");
  dt_bauhaus_slider_set_digits(g->scale_r, 3);
  dt_bauhaus_slider_set_digits(g->scale_g, 3);
  dt_bauhaus_slider_set_digits(g->scale_b, 3);
  dt_bauhaus_slider_set_digits(g->scale_g2, 3);
 
  gtk_widget_set_no_show_all(g->scale_g2, TRUE);
 
  g_signal_connect(G_OBJECT(g->scale_k), "value-changed", G_CALLBACK(temp_tint_callback), self);
  g_signal_connect(G_OBJECT(g->scale_tint), "value-changed", G_CALLBACK(temp_tint_callback), self);
 
  g_signal_connect(G_OBJECT(g->presets), "value-changed", G_CALLBACK(preset_tune_callback), self);
 
  // start building top level widget
  self->widget = gtk_stack_new();
  gtk_stack_set_homogeneous(GTK_STACK(self->widget), FALSE);
 
  GtkWidget *label_disabled = gtk_label_new(_("white balance disabled for camera"));
  gtk_widget_set_halign(label_disabled, GTK_ALIGN_START);
  gtk_label_set_ellipsize(GTK_LABEL(label_disabled), PANGO_ELLIPSIZE_END);
 
  gtk_stack_add_named(GTK_STACK(self->widget), GTK_WIDGET(box_enabled), "enabled");
  gtk_stack_add_named(GTK_STACK(self->widget), label_disabled, "disabled");
}
 
void gui_cleanup(struct dt_iop_module_t *self)
{
  self->request_color_pick = DT_REQUEST_COLORPICK_OFF;
 
  IOP_GUI_FREE;
}
 
void gui_reset(struct dt_iop_module_t *self)
{
  dt_iop_temperature_gui_data_t *g = (dt_iop_temperature_gui_data_t *)self->gui_data;
 
  const int preset = dt_bauhaus_combobox_get(g->presets);
  dt_iop_color_picker_reset(self, TRUE);
 
  gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(g->btn_asshot), preset == DT_IOP_TEMP_AS_SHOT);
  gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(g->btn_user), preset == DT_IOP_TEMP_USER);
  gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(g->btn_d65), preset == DT_IOP_TEMP_D65);
 
  color_rgb_sliders(self);
  color_temptint_sliders(self);
}
 
// 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