/*
    This file is part of darktable,
    copyright (c) 2009--2013 johannes hanika.
    copyright (c) 2015 LebedevRI.

    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 <xmmintrin.h>
#include <stdlib.h>
#include <math.h>
#include <assert.h>
#include <string.h>
#include <lcms2.h>

#include "common/darktable.h"
#include "develop/develop.h"
#include "develop/tiling.h"
#include "control/control.h"
#include "common/colorspaces.h"
#include "common/opencl.h"
#include "gui/accelerators.h"
#include "gui/gtk.h"
#include "external/wb_presets.c"
#include "bauhaus/bauhaus.h"

// for Kelvin temperature and bogus WB
#include "external/adobe_coeff.c"
#include "external/cie_colorimetric_tables.c"
#include "common/colorspaces.h"

DT_MODULE_INTROSPECTION(2, 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 3

typedef struct dt_iop_temperature_params_t
{
  float temp_out;
  float coeffs[3];
} dt_iop_temperature_params_t;

typedef struct dt_iop_temperature_gui_data_t
{
  GtkWidget *scale_k, *scale_tint, *scale_r, *scale_g, *scale_b;
  GtkWidget *presets;
  GtkWidget *finetune;
  int preset_cnt;
  int preset_num[50];
  double daylight_wb[3];
  double XYZ_to_CAM[3][3], CAM_to_XYZ[3][3];
} dt_iop_temperature_gui_data_t;

typedef struct dt_iop_temperature_data_t
{
  float coeffs[3];
} dt_iop_temperature_data_t;


typedef struct dt_iop_temperature_global_data_t
{
  int kernel_whitebalance_4f;
  int kernel_whitebalance_1f;
} dt_iop_temperature_global_data_t;

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",
  };

  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");
}


int groups()
{
  return IOP_GROUP_BASIC;
}

int flags()
{
  return IOP_FLAGS_ALLOW_TILING | IOP_FLAGS_ONE_INSTANCE;
}

void init_key_accels(dt_iop_module_so_t *self)
{
  dt_accel_register_slider_iop(self, FALSE, NC_("accel", "tint"));
  dt_accel_register_slider_iop(self, FALSE, NC_("accel", "temperature"));
  dt_accel_register_slider_iop(self, FALSE, NC_("accel", "red"));
  dt_accel_register_slider_iop(self, FALSE, NC_("accel", "green"));
  dt_accel_register_slider_iop(self, FALSE, NC_("accel", "blue"));
}

void connect_key_accels(dt_iop_module_t *self)
{
  dt_iop_temperature_gui_data_t *g = (dt_iop_temperature_gui_data_t *)self->gui_data;

  dt_accel_connect_slider_iop(self, "tint", GTK_WIDGET(g->scale_tint));
  dt_accel_connect_slider_iop(self, "temperature", GTK_WIDGET(g->scale_k));
  dt_accel_connect_slider_iop(self, "red", GTK_WIDGET(g->scale_r));
  dt_accel_connect_slider_iop(self, "green", GTK_WIDGET(g->scale_g));
  dt_accel_connect_slider_iop(self, "blue", GTK_WIDGET(g->scale_b));
}


int output_bpp(dt_iop_module_t *module, dt_dev_pixelpipe_t *pipe, dt_dev_pixelpipe_iop_t *piece)
{
  if(!dt_dev_pixelpipe_uses_downsampled_input(pipe) && (pipe->image.flags & DT_IMAGE_RAW))
    return sizeof(float);
  else
    return 4 * sizeof(float);
}

/*
 * 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 = MAX(MAX(Source.X, Source.Y), Source.Z);
  Source.X /= _max;
  Source.Y /= _max;
  Source.Z /= _max;

  return Source;
}

//
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);
  }
}

// binary search inversion
static void XYZ_to_temperature(cmsCIEXYZ XYZ, double *TempK, double *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);

  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 temp2mul(dt_iop_module_t *self, double TempK, double tint, double mul[3])
{
  dt_iop_temperature_gui_data_t *g = (dt_iop_temperature_gui_data_t *)self->gui_data;

  cmsCIEXYZ _xyz = temperature_to_XYZ(TempK);

  double XYZ[3] = { _xyz.X, _xyz.Y / tint, _xyz.Z };

  double CAM[3];
  for(int k = 0; k < 3; 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 < 3; k++) mul[k] = 1.0 / CAM[k];
}

static void mul2temp(dt_iop_module_t *self, float coeffs[3], double *TempK, double *tint)
{
  dt_iop_temperature_gui_data_t *g = (dt_iop_temperature_gui_data_t *)self->gui_data;

  double CAM[3];
  for(int k = 0; k < 3; k++) CAM[k] = 1.0 / coeffs[k];

  double XYZ[3];
  for(int k = 0; k < 3; k++)
  {
    XYZ[k] = 0.0;
    for(int i = 0; i < 3; i++)
    {
      XYZ[k] += g->CAM_to_XYZ[k][i] * CAM[i];
    }
  }

  XYZ_to_temperature((cmsCIEXYZ){ XYZ[0], XYZ[1], XYZ[2] }, TempK, tint);
}

/*
 * interpolate values from p1 and p2 into out.
 */
void dt_wb_preset_interpolate(const wb_data *const p1, // the smaller tuning
                              const wb_data *const p2, // the larger tuning (can't be == p1)
                              wb_data *out)            // has tuning initialized
{
  // stupid linear interpolation.
  // to be confirmed.
  const double t = CLAMP((double)(out->tuning - p1->tuning) / (double)(p2->tuning - p1->tuning), 0.0, 1.0);
  for(int k = 0; k < 3; k++)
  {
    out->channel[k] = (1.0 - t) * p1->channel[k] + t * p2->channel[k];
  }
}

static int FC(const int row, const int col, const unsigned int filters)
{
  return filters >> (((row << 1 & 14) + (col & 1)) << 1) & 3;
}

static uint8_t FCxtrans(const int row, const int col, const dt_iop_roi_t *const roi,
                        uint8_t (*const xtrans)[6])
{
  return xtrans[(row + roi->y) % 6][(col + roi->x) % 6];
}

void process(struct dt_iop_module_t *self, dt_dev_pixelpipe_iop_t *piece, void *ivoid, void *ovoid,
             const dt_iop_roi_t *roi_in, const dt_iop_roi_t *roi_out)
{
  const int filters = dt_image_filter(&piece->pipe->image);
  uint8_t (*const xtrans)[6] = self->dev->image_storage.xtrans;
  dt_iop_temperature_data_t *d = (dt_iop_temperature_data_t *)piece->data;
  if(!dt_dev_pixelpipe_uses_downsampled_input(piece->pipe) && filters == 9u)
  { // xtrans float mosaiced
#ifdef _OPENMP
#pragma omp parallel for default(none) shared(roi_out, ivoid, ovoid, d) schedule(static)
#endif
    for(int j = 0; j < roi_out->height; j++)
    {
      const float *in = ((float *)ivoid) + (size_t)j * roi_out->width;
      float *out = ((float *)ovoid) + (size_t)j * roi_out->width;
      for(int i = 0; i < roi_out->width; i++, out++, in++)
        *out = *in * d->coeffs[FCxtrans(j, i, roi_out, xtrans)];
    }
  }
  else if(!dt_dev_pixelpipe_uses_downsampled_input(piece->pipe) && filters)
  { // bayer float mosaiced
#ifdef _OPENMP
#pragma omp parallel for default(none) shared(roi_out, ivoid, ovoid, d) schedule(static)
#endif
    for(int j = 0; j < roi_out->height; j++)
    {
      const float *in = ((float *)ivoid) + (size_t)j * roi_out->width;
      float *out = ((float *)ovoid) + (size_t)j * roi_out->width;

      int i = 0;
      int alignment = ((4 - (j * roi_out->width & (4 - 1))) & (4 - 1));

      // process unaligned pixels
      for(; i < alignment; i++, out++, in++)
        *out = *in * d->coeffs[FC(j + roi_out->y, i + roi_out->x, filters)];

      const __m128 coeffs = _mm_set_ps(d->coeffs[FC(j + roi_out->y, roi_out->x + i + 3, filters)],
                                       d->coeffs[FC(j + roi_out->y, roi_out->x + i + 2, filters)],
                                       d->coeffs[FC(j + roi_out->y, roi_out->x + i + 1, filters)],
                                       d->coeffs[FC(j + roi_out->y, roi_out->x + i, filters)]);

      // process aligned pixels with SSE
      for(; i < roi_out->width - (4 - 1); i += 4, in += 4, out += 4)
      {
        const __m128 input = _mm_load_ps(in);

        const __m128 multiplied = _mm_mul_ps(input, coeffs);

        _mm_stream_ps(out, multiplied);
      }

      // process the rest
      for(; i < roi_out->width; i++, out++, in++)
        *out = *in * d->coeffs[FC(j + roi_out->y, i + roi_out->x, filters)];
    }
    _mm_sfence();
  }
#if 0
  else if(dt_dev_pixelpipe_uses_downsampled_input(piece->pipe) && filters
          && piece->pipe->pre_monochrome_demosaiced)
  { // pre-demosaiced (monochrome)
    const int ch = piece->colors;
#ifdef _OPENMP
#pragma omp parallel for default(none) shared(roi_out, ivoid, ovoid, d) schedule(static)
#endif
    for(int j = 0; j < roi_out->height; j++)
    {
      const float *in = ((float *)ivoid) + (size_t)ch * j * roi_out->width;
      float *out = ((float *)ovoid) + (size_t)ch * j * roi_out->width;

      const __m128 coeffs[3]
          = { _mm_set1_ps(d->coeffs[0]), _mm_set1_ps(d->coeffs[1]), _mm_set1_ps(d->coeffs[2]) };

      for(int i = 0; i < roi_out->width; i++, in += ch, out += ch)
      {
        const __m128 input = _mm_load_ps(in);
        const __m128 multiplied = _mm_mul_ps(input, coeffs[FC(j + roi_out->y, roi_out->x + i, filters)]);
        _mm_stream_ps(out, multiplied);
      }
    }
    _mm_sfence();

    if(piece->pipe->mask_display) dt_iop_alpha_copy(ivoid, ovoid, roi_out->width, roi_out->height);
  }
#endif
  else
  { // non-mosaiced
    const int ch = piece->colors;

    const __m128 coeffs = _mm_set_ps(1.0f, d->coeffs[2], d->coeffs[1], d->coeffs[0]);

#ifdef _OPENMP
#pragma omp parallel for default(none) shared(roi_out, ivoid, ovoid, d) schedule(static)
#endif
    for(int k = 0; k < roi_out->height; k++)
    {
      const float *in = ((float *)ivoid) + (size_t)ch * k * roi_out->width;
      float *out = ((float *)ovoid) + (size_t)ch * k * roi_out->width;
      for(int j = 0; j < roi_out->width; j++, in += ch, out += ch)
      {
        const __m128 input = _mm_load_ps(in);
        const __m128 multiplied = _mm_mul_ps(input, coeffs);
        _mm_stream_ps(out, multiplied);
      }
    }
    _mm_sfence();

    if(piece->pipe->mask_display) dt_iop_alpha_copy(ivoid, ovoid, roi_out->width, roi_out->height);
  }
  for(int k = 0; k < 3; k++)
    piece->pipe->processed_maximum[k] = d->coeffs[k] * piece->pipe->processed_maximum[k];
}

#ifdef HAVE_OPENCL
int process_cl(struct dt_iop_module_t *self, dt_dev_pixelpipe_iop_t *piece, cl_mem dev_in, cl_mem dev_out,
               const dt_iop_roi_t *roi_in, const dt_iop_roi_t *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->data;

  const int devid = piece->pipe->devid;
  const int filters = dt_image_filter(&piece->pipe->image);
  cl_mem dev_coeffs = NULL;
  cl_int err = -999;
  int kernel = -1;

  if(!dt_dev_pixelpipe_uses_downsampled_input(piece->pipe) && filters)
  {
    kernel = gd->kernel_whitebalance_1f;
  }
  else
  {
    kernel = gd->kernel_whitebalance_4f;
  }

  dev_coeffs = dt_opencl_copy_host_to_device_constant(devid, sizeof(float) * 3, d->coeffs);
  if(dev_coeffs == NULL) goto error;

  const int width = roi_in->width;
  const int height = roi_in->height;

  size_t sizes[] = { ROUNDUPWD(width), ROUNDUPHT(height), 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);
  err = dt_opencl_enqueue_kernel_2d(devid, kernel, sizes);
  if(err != CL_SUCCESS) goto error;

  dt_opencl_release_mem_object(dev_coeffs);
  for(int k = 0; k < 3; k++)
    piece->pipe->processed_maximum[k] = d->coeffs[k] * piece->pipe->processed_maximum[k];
  return TRUE;

error:
  if(dev_coeffs != NULL) dt_opencl_release_mem_object(dev_coeffs);
  dt_print(DT_DEBUG_OPENCL, "[opencl_white_balance] couldn't enqueue kernel! %d\n", err);
  return FALSE;
}
#endif

void tiling_callback(struct dt_iop_module_t *self, struct dt_dev_pixelpipe_iop_t *piece,
                     const dt_iop_roi_t *roi_in, const dt_iop_roi_t *roi_out,
                     struct dt_develop_tiling_t *tiling)
{
  tiling->factor = 2.0f; // in + out
  tiling->maxbuf = 1.0f;
  tiling->overhead = 0;
  tiling->overlap = 0;
  tiling->xalign = 2; // Bayer pattern
  tiling->yalign = 2; // Bayer pattern
  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_temperature_params_t *p = (dt_iop_temperature_params_t *)p1;
  dt_iop_temperature_data_t *d = (dt_iop_temperature_data_t *)piece->data;
  for(int k = 0; k < 3; k++) d->coeffs[k] = p->coeffs[k];

  if(dt_image_filter(&piece->pipe->image) && dt_dev_pixelpipe_uses_downsampled_input(piece->pipe)
     && pipe->pre_monochrome_demosaiced)
  {
    // piece->process_cl_ready = 0;
    piece->enabled = 0;
  }

  // x-trans images not implemented in OpenCL yet
  if(pipe->image.filters == 9u) piece->process_cl_ready = 0;
}

void init_pipe(struct dt_iop_module_t *self, dt_dev_pixelpipe_t *pipe, dt_dev_pixelpipe_iop_t *piece)
{
  piece->data = malloc(sizeof(dt_iop_temperature_data_t));
  self->commit_params(self, self->default_params, pipe, piece);
}

void cleanup_pipe(struct dt_iop_module_t *self, dt_dev_pixelpipe_t *pipe, dt_dev_pixelpipe_iop_t *piece)
{
  free(piece->data);
  piece->data = NULL;
}

void gui_update(struct dt_iop_module_t *self)
{
  dt_iop_module_t *module = (dt_iop_module_t *)self;
  self->request_color_pick = DT_REQUEST_COLORPICK_OFF;
  self->color_picker_box[0] = self->color_picker_box[1] = .25f;
  self->color_picker_box[2] = self->color_picker_box[3] = .75f;
  self->color_picker_point[0] = self->color_picker_point[1] = 0.5f;
  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 *)module->params;
  dt_iop_temperature_params_t *fp = (dt_iop_temperature_params_t *)module->default_params;

  double TempK, tint;
  mul2temp(self, p->coeffs, &TempK, &tint);

  dt_bauhaus_slider_set(g->scale_r, p->coeffs[0]);
  dt_bauhaus_slider_set(g->scale_g, p->coeffs[1]);
  dt_bauhaus_slider_set(g->scale_b, p->coeffs[2]);
  dt_bauhaus_slider_set(g->scale_k, TempK);
  dt_bauhaus_slider_set(g->scale_tint, tint);

  dt_bauhaus_combobox_clear(g->presets);
  dt_bauhaus_combobox_add(g->presets, C_("white balance", "camera"));
  dt_bauhaus_combobox_add(g->presets, C_("white balance", "camera neutral"));
  dt_bauhaus_combobox_add(g->presets, C_("white balance", "spot"));
  g->preset_cnt = DT_IOP_NUM_OF_STD_TEMP_PRESETS;
  memset(g->preset_num, 0, sizeof(g->preset_num));

  dt_bauhaus_combobox_set(g->presets, -1);
  dt_bauhaus_slider_set(g->finetune, 0);
  gtk_widget_set_sensitive(g->finetune, 0);

  const char *wb_name = NULL;
  if(!dt_image_is_ldr(&self->dev->image_storage))
    for(int i = 0; i < wb_preset_count; i++)
    {
      if(g->preset_cnt >= 50) break;
      if(!strcmp(wb_preset[i].make, self->dev->image_storage.camera_maker) 
         && !strcmp(wb_preset[i].model, self->dev->image_storage.camera_model))
      {
        if(!wb_name || strcmp(wb_name, wb_preset[i].name))
        {
          wb_name = wb_preset[i].name;
          dt_bauhaus_combobox_add(g->presets, _(wb_preset[i].name));
          g->preset_num[g->preset_cnt] = i;
          g->preset_cnt++;
        }
      }
    }

  gboolean found = FALSE;
  // is this a camera white balance?
  if(memcmp(p->coeffs, fp->coeffs, 3 * sizeof(float)) == 0)
  {
    dt_bauhaus_combobox_set(g->presets, 0);
    found = TRUE;
  }
  else
  {
    // is this a "camera neutral white balance"?
    if((p->coeffs[0] == (float)g->daylight_wb[0]) && (p->coeffs[1] == (float)g->daylight_wb[1])
       && (p->coeffs[2] == (float)g->daylight_wb[2]))
    {
      dt_bauhaus_combobox_set(g->presets, 1);
      found = TRUE;
    }
  }

  if(!found)
  {
    // look through all added presets
    for(int j = DT_IOP_NUM_OF_STD_TEMP_PRESETS; !found && (j < g->preset_cnt); j++)
    {
      // look through all variants of this preset, with different tuning
      for(int i = g->preset_num[j]; !found && (i < wb_preset_count) 
                                    && !strcmp(wb_preset[i].make, self->dev->image_storage.camera_maker)
                                    && !strcmp(wb_preset[i].model, self->dev->image_storage.camera_model)
                                    && !strcmp(wb_preset[i].name, wb_preset[g->preset_num[j]].name);
          i++)
      {
        float coeffs[3];
        for(int k = 0; k < 3; k++) coeffs[k] = wb_preset[i].channel[k];

        if(memcmp(coeffs, p->coeffs, 3 * sizeof(float)) == 0)
        {
          // got exact match!
          dt_bauhaus_combobox_set(g->presets, j);
          gtk_widget_set_sensitive(g->finetune, 1);
          dt_bauhaus_slider_set(g->finetune, wb_preset[i].tuning);
          found = TRUE;
          break;
        }
      }
    }

    if(!found)
    {
      // ok, we haven't found exact match, maybe this was interpolated?

      // look through all added presets
      for(int j = DT_IOP_NUM_OF_STD_TEMP_PRESETS; !found && (j < g->preset_cnt); j++)
      {
        // look through all variants of this preset, with different tuning
        int i = g->preset_num[j] + 1;
        while(!found && (i < wb_preset_count) && !strcmp(wb_preset[i].make, self->dev->image_storage.camera_maker)
              && !strcmp(wb_preset[i].model, self->dev->image_storage.camera_maker)
              && !strcmp(wb_preset[i].name, wb_preset[g->preset_num[j]].name))
        {
          // let's find gaps
          if(wb_preset[i - 1].tuning + 1 == wb_preset[i].tuning)
          {
            i++;
            continue;
          }

          // we have a gap!

          // we do not know what finetuning value was set, we need to bruteforce to find it
          for(int tune = wb_preset[i - 1].tuning + 1; !found && (tune < wb_preset[i].tuning); tune++)
          {
            wb_data interpolated = {.tuning = tune };
            dt_wb_preset_interpolate(&wb_preset[i - 1], &wb_preset[i], &interpolated);

            float coeffs[3];
            for(int k = 0; k < 3; k++) coeffs[k] = interpolated.channel[k];

            if(memcmp(coeffs, p->coeffs, 3 * sizeof(float)) == 0)
            {
              // got exact match!

              dt_bauhaus_combobox_set(g->presets, j);
              gtk_widget_set_sensitive(g->finetune, 1);
              dt_bauhaus_slider_set(g->finetune, tune);
              found = TRUE;
              break;
            }
          }
          i++;
        }
      }
    }
  }
}

static int calculate_bogus_daylight_wb(dt_iop_module_t *module, double bwb[3])
{
  if(!dt_image_is_raw(&module->dev->image_storage))
  {
    bwb[0] = 1.0;
    bwb[2] = 1.0;
    bwb[1] = 1.0;

    return 0;
  }

  // color matrix
  float XYZ_to_CAM[4][3];
  XYZ_to_CAM[0][0] = NAN;
  dt_dcraw_adobe_coeff(module->dev->image_storage.camera_makermodel, (float(*)[12])XYZ_to_CAM);
  if(!isnan(XYZ_to_CAM[0][0]))
  {
    // sRGB D65
    const double RGB_to_XYZ[3][3] = { { 0.4124564, 0.3575761, 0.1804375 },
                                      { 0.2126729, 0.7151522, 0.0721750 },
                                      { 0.0193339, 0.1191920, 0.9503041 } };

    double RGB_to_CAM[3][3];
    for(int i = 0; i < 3; i++)
    {
      for(int j = 0; j < 3; j++)
      {
        RGB_to_CAM[i][j] = 0.0;
        for(int k = 0; k < 3; k++) RGB_to_CAM[i][j] += XYZ_to_CAM[i][k] * RGB_to_XYZ[k][j];
      }
    }

    const double RGB[3] = { 1.0, 1.0, 1.0 };

    double CAM[3];
    for(int c = 0; c < 3; c++)
    {
      CAM[c] = 0.0;
      for(int i = 0; i < 3; i++)
      {
        CAM[c] += RGB_to_CAM[c][i] * RGB[i];
      }
    }

    double mul[3];
    for(int k = 0; k < 3; k++) mul[k] = 1.0 / CAM[k];

    // normalize green:
    bwb[0] = mul[0] / mul[1];
    bwb[2] = mul[2] / mul[1];
    bwb[1] = 1.0;

    return 0;
  }

  return 1;
}

static int prepare_wb_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][3] = { { 0.4124564, 0.3575761, 0.1804375 },
                                    { 0.2126729, 0.7151522, 0.0721750 },
                                    { 0.0193339, 0.1191920, 0.9503041 } };

  // sRGB D65
  const double XYZ_to_RGB[3][3] = { { 3.2404542, -1.5371385, -0.4985314 },
                                    { -0.9692660, 1.8760108, 0.0415560 },
                                    { 0.0556434, -0.2040259, 1.0572252 } };

  if(!dt_image_is_raw(&module->dev->image_storage))
  {
    // let's just assume for now(TM) that if it is not raw, it is sRGB
    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 0;
  }

  // prepare matrices for Kelvin temperature
  float XYZ_to_CAM[4][3];
  XYZ_to_CAM[0][0] = NAN;
  dt_dcraw_adobe_coeff(module->dev->image_storage.camera_makermodel, (float(*)[12])XYZ_to_CAM);
  if(!isnan(XYZ_to_CAM[0][0]))
  {
    for(int i = 0; i < 3; i++)
    {
      for(int j = 0; j < 3; j++)
      {
        g->XYZ_to_CAM[i][j] = (double)XYZ_to_CAM[i][j];
      }
    }

    // and inverse matrix
    mat3inv_double((double *)g->CAM_to_XYZ, (double *)g->XYZ_to_CAM);

    return 0;
  }

  return 1;
}

void reload_defaults(dt_iop_module_t *module)
{
  dt_iop_temperature_params_t tmp
      = (dt_iop_temperature_params_t){.temp_out = 5000.0, .coeffs = { 1.0, 1.0, 1.0 } };

  // we might be called from presets update infrastructure => there is no image
  if(!module->dev) goto end;

  if(module->gui_data) prepare_wb_matrices(module);

  /* check if file is raw / hdr */
  if(dt_image_is_raw(&module->dev->image_storage))
  {
    // raw images need wb:
    module->default_enabled = 1;

    int found = 1;

    for(int k = 0; k < 3; k++)
    {
      if(isnan(module->dev->image_storage.wb_coeffs[k]) || module->dev->image_storage.wb_coeffs[k] == 0.0f)
      {
        found = 0;
        break;
      }
    }

    if(found)
    {
      for(int k = 0; k < 3; k++) tmp.coeffs[k] = module->dev->image_storage.wb_coeffs[k];
    }
    else
    {
      if(!(!strncmp(module->dev->image_storage.exif_maker, "Leica Camera AG", 15)
           && !strncmp(module->dev->image_storage.exif_model, "M9 monochrom", 12)))
      {
        if(!ignore_missing_wb(&(module->dev->image_storage)))
        {
          dt_control_log(_("failed to read camera white balance information!"));
          fprintf(stderr, "[temperature] failed to read camera white balance information from `%s'!\n",
                  module->dev->image_storage.filename);
        }
      }
      else
      {
        // nop white balance is valid for monochrome sraws (like the leica monochrom produces)
        goto gui;
      }
    }

    if(!found)
    {
      double bwb[3];
      if(!calculate_bogus_daylight_wb(module, bwb))
      {
        // found camera matrix and used it to calculate bogus daylight wb
        for(int c = 0; c < 3; c++) tmp.coeffs[c] = bwb[c];
        found = 1;
      }
    }

    // no cam matrix??? try presets:
    if(!found)
    {
      for(int i = 0; i < wb_preset_count; i++)
      {
        if(!strcmp(wb_preset[i].make, module->dev->image_storage.camera_maker)
           && !strcmp(wb_preset[i].model, module->dev->image_storage.camera_model))
        {
          // just take the first preset we find for this camera
          for(int k = 0; k < 3; k++) tmp.coeffs[k] = wb_preset[i].channel[k];
          found = 1;
          break;
        }
      }
    }

    // did not find preset either?
    if(!found)
    {
      // final security net: hardcoded default that fits most cams.
      tmp.coeffs[0] = 2.0f;
      tmp.coeffs[1] = 1.0f;
      tmp.coeffs[2] = 1.5f;
    }

    tmp.coeffs[0] /= tmp.coeffs[1];
    tmp.coeffs[2] /= tmp.coeffs[1];
    tmp.coeffs[1] = 1.0f;
  }

gui:
  // remember daylight wb used for temperature/tint conversion,
  // assuming it corresponds to CIE daylight (D65)
  if(module->gui_data)
  {
    dt_iop_temperature_gui_data_t *g = (dt_iop_temperature_gui_data_t *)module->gui_data;

    dt_bauhaus_slider_set_default(g->scale_r, tmp.coeffs[0]);
    dt_bauhaus_slider_set_default(g->scale_g, tmp.coeffs[1]);
    dt_bauhaus_slider_set_default(g->scale_b, tmp.coeffs[2]);

    // to have at least something and definitely not crash
    for(int c = 0; c < 3; c++) g->daylight_wb[c] = tmp.coeffs[c];

    if(!calculate_bogus_daylight_wb(module, g->daylight_wb))
    {
      // found camera matrix and used it to calculate bogus daylight wb
    }
    else
    {
      // if we didn't find anything for daylight wb, look for a wb preset with appropriate name.
      // we're normalizing that to be D65
      for(int i = 0; i < wb_preset_count; i++)
      {
        if(!strcmp(wb_preset[i].make, module->dev->image_storage.camera_maker) 
           && !strcmp(wb_preset[i].model, module->dev->image_storage.camera_model)
           && !strcmp(wb_preset[i].name, Daylight) && wb_preset[i].tuning == 0)
        {
          for(int k = 0; k < 3; k++) g->daylight_wb[k] = wb_preset[i].channel[k];
          break;
        }
      }
    }

    double TempK, tint;
    mul2temp(module, tmp.coeffs, &TempK, &tint);

    dt_bauhaus_slider_set_default(g->scale_k, TempK);
    dt_bauhaus_slider_set_default(g->scale_tint, tint);
  }

end:
  memcpy(module->params, &tmp, sizeof(dt_iop_temperature_params_t));
  memcpy(module->default_params, &tmp, sizeof(dt_iop_temperature_params_t));
}

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");
}

void init(dt_iop_module_t *module)
{
  module->params = calloc(1, sizeof(dt_iop_temperature_params_t));
  module->default_params = calloc(1, sizeof(dt_iop_temperature_params_t));
  module->priority = 50; // module order created by iop_dependencies.py, do not edit!
  module->params_size = sizeof(dt_iop_temperature_params_t);
  module->gui_data = NULL;
}

void cleanup(dt_iop_module_t *module)
{
  free(module->params);
  module->params = NULL;
}

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);
  free(module->data);
  module->data = NULL;
}

static void gui_update_from_coeffs(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;

  double TempK, tint;
  mul2temp(self, p->coeffs, &TempK, &tint);

  darktable.gui->reset = 1;
  dt_bauhaus_slider_set(g->scale_k, TempK);
  dt_bauhaus_slider_set(g->scale_tint, tint);
  dt_bauhaus_slider_set(g->scale_r, p->coeffs[0]);
  dt_bauhaus_slider_set(g->scale_g, p->coeffs[1]);
  dt_bauhaus_slider_set(g->scale_b, p->coeffs[2]);
  darktable.gui->reset = 0;
}


static gboolean draw(GtkWidget *widget, cairo_t *cr, dt_iop_module_t *self)
{
  // capture gui color picked event.
  if(darktable.gui->reset) return FALSE;
  if(self->picked_color_max[0] < self->picked_color_min[0]) return FALSE;
  if(self->request_color_pick == DT_REQUEST_COLORPICK_OFF) return FALSE;
  static float old[3] = { 0, 0, 0 };
  const float *grayrgb = self->picked_color;
  if(grayrgb[0] == old[0] && grayrgb[1] == old[1] && grayrgb[2] == old[2]) return FALSE;
  for(int k = 0; k < 3; k++) old[k] = grayrgb[k];
  dt_iop_temperature_params_t *p = (dt_iop_temperature_params_t *)self->params;
  for(int k = 0; k < 3; k++) p->coeffs[k] = (grayrgb[k] > 0.001f) ? 1.0f / grayrgb[k] : 1.0f;
  // normalize green:
  p->coeffs[0] /= p->coeffs[1];
  p->coeffs[2] /= p->coeffs[1];
  p->coeffs[1] = 1.0;
  for(int k = 0; k < 3; k++) p->coeffs[k] = fmaxf(0.0f, fminf(8.0f, p->coeffs[k]));
  gui_update_from_coeffs(self);
  dt_dev_add_history_item(darktable.develop, self, TRUE);
  return FALSE;
}

static void temp_changed(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 double TempK = dt_bauhaus_slider_get(g->scale_k);
  const double tint = dt_bauhaus_slider_get(g->scale_tint);

  double rgb[3];
  temp2mul(self, TempK, tint, rgb);

  // normalize
  rgb[0] /= rgb[1];
  rgb[2] /= rgb[1];
  rgb[1] = 1.0;

  for(int c = 0; c < 3; c++) p->coeffs[c] = rgb[c];

  darktable.gui->reset = 1;
  dt_bauhaus_slider_set(g->scale_r, p->coeffs[0]);
  dt_bauhaus_slider_set(g->scale_g, p->coeffs[1]);
  dt_bauhaus_slider_set(g->scale_b, p->coeffs[2]);
  darktable.gui->reset = 0;
  dt_dev_add_history_item(darktable.develop, self, TRUE);
}

static void tint_callback(GtkWidget *slider, gpointer user_data)
{
  dt_iop_module_t *self = (dt_iop_module_t *)user_data;
  if(self->dt->gui->reset) return;
  temp_changed(self);
  dt_iop_temperature_gui_data_t *g = (dt_iop_temperature_gui_data_t *)self->gui_data;
  dt_bauhaus_combobox_set(g->presets, -1);
}

static void temp_callback(GtkWidget *slider, gpointer user_data)
{
  dt_iop_module_t *self = (dt_iop_module_t *)user_data;
  if(self->dt->gui->reset) return;
  temp_changed(self);
  dt_iop_temperature_gui_data_t *g = (dt_iop_temperature_gui_data_t *)self->gui_data;
  dt_bauhaus_combobox_set(g->presets, -1);
}

static void rgb_callback(GtkWidget *slider, gpointer user_data)
{
  dt_iop_module_t *self = (dt_iop_module_t *)user_data;
  if(self->dt->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 float value = dt_bauhaus_slider_get(slider);
  if(slider == g->scale_r)
    p->coeffs[0] = value;
  else if(slider == g->scale_g)
    p->coeffs[1] = value;
  else if(slider == g->scale_b)
    p->coeffs[2] = value;

  gui_update_from_coeffs(self);
  dt_dev_add_history_item(darktable.develop, self, TRUE);
  dt_bauhaus_combobox_set(g->presets, -1);
}

static void apply_preset(dt_iop_module_t *self)
{
  self->request_color_pick = DT_REQUEST_COLORPICK_OFF;
  if(self->dt->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_temperature_params_t *fp = (dt_iop_temperature_params_t *)self->default_params;
  const int tune = dt_bauhaus_slider_get(g->finetune);
  const int pos = dt_bauhaus_combobox_get(g->presets);
  switch(pos)
  {
    case -1: // just un-setting.
      return;
    case 0: // camera wb
      for(int k = 0; k < 3; k++) p->coeffs[k] = fp->coeffs[k];
      break;
    case 1: // camera neutral wb
      for(int k = 0; k < 3; k++) p->coeffs[k] = g->daylight_wb[k];
      break;
    case 2: // spot wb, expose callback will set p->coeffs.
      for(int k = 0; k < 3; k++) p->coeffs[k] = fp->coeffs[k];
      dt_iop_request_focus(self);
      self->request_color_pick = DT_REQUEST_COLORPICK_MODULE;

      /* set the area sample size*/
      if(self->request_color_pick != DT_REQUEST_COLORPICK_OFF)
        dt_lib_colorpicker_set_area(darktable.lib, 0.99);

      break;
    default: // camera WB presets
    {
      gboolean found = FALSE;
      // look through all variants of this preset, with different tuning
      for(int i = g->preset_num[pos]; (i < wb_preset_count) 
                                      && !strcmp(wb_preset[i].make, self->dev->image_storage.camera_maker)
                                      && !strcmp(wb_preset[i].model, self->dev->image_storage.camera_model)
                                      && !strcmp(wb_preset[i].name, wb_preset[g->preset_num[pos]].name);
          i++)
      {
        if(wb_preset[i].tuning == tune)
        {
          // got exact match!
          for(int k = 0; k < 3; k++) p->coeffs[k] = wb_preset[i].channel[k];
          found = TRUE;
          break;
        }
      }

      if(!found)
      {
        // ok, we haven't found exact match, need to interpolate

        // let's find 2 most closest tunings with needed_tuning in-between
        int min_id = INT_MIN, max_id = INT_MIN;

        // look through all variants of this preset, with different tuning, starting from second entry (if
        // any)
        int i = g->preset_num[pos] + 1;
        while((i < wb_preset_count) && !strcmp(wb_preset[i].make, self->dev->image_storage.camera_maker)
              && !strcmp(wb_preset[i].model, self->dev->image_storage.camera_model)
              && !strcmp(wb_preset[i].name, wb_preset[g->preset_num[pos]].name))
        {
          if(wb_preset[i - 1].tuning < tune && wb_preset[i].tuning > tune)
          {
            min_id = i - 1;
            max_id = i;
            break;
          }

          i++;
        }

        // have we found enough good data?
        if(min_id == INT_MIN || max_id == INT_MIN || min_id == max_id) break; // hysteresis

        wb_data interpolated = {.tuning = tune };
        dt_wb_preset_interpolate(&wb_preset[min_id], &wb_preset[max_id], &interpolated);
        for(int k = 0; k < 3; k++) p->coeffs[k] = interpolated.channel[k];
      }
    }
    break;
  }
  if(self->off) gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(self->off), 1);
  gui_update_from_coeffs(self);
  dt_dev_add_history_item(darktable.develop, self, TRUE);
}

static void presets_changed(GtkWidget *widget, gpointer user_data)
{
  dt_iop_module_t *self = (dt_iop_module_t *)user_data;
  apply_preset(self);
  const int pos = dt_bauhaus_combobox_get(widget);
  dt_iop_temperature_gui_data_t *g = (dt_iop_temperature_gui_data_t *)self->gui_data;
  gtk_widget_set_sensitive(g->finetune, pos >= DT_IOP_NUM_OF_STD_TEMP_PRESETS);
}

static void finetune_changed(GtkWidget *widget, gpointer user_data)
{
  apply_preset((dt_iop_module_t *)user_data);
}

void gui_init(struct dt_iop_module_t *self)
{
  self->gui_data = malloc(sizeof(dt_iop_temperature_gui_data_t));
  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->default_params;

  self->request_color_pick = DT_REQUEST_COLORPICK_OFF;
  self->widget = gtk_box_new(GTK_ORIENTATION_VERTICAL, DT_BAUHAUS_SPACE);
  g_signal_connect(G_OBJECT(self->widget), "draw", G_CALLBACK(draw), self);

  for(int k = 0; k < 3; k++) g->daylight_wb[k] = 1.0;
  g->scale_tint
      = dt_bauhaus_slider_new_with_range(self, DT_IOP_LOWEST_TINT, DT_IOP_HIGHEST_TINT, .01, 1.0, 3);
  g->scale_k = dt_bauhaus_slider_new_with_range(self, DT_IOP_LOWEST_TEMPERATURE, DT_IOP_HIGHEST_TEMPERATURE,
                                                10., 5000.0, 0);
  g->scale_r = dt_bauhaus_slider_new_with_range(self, 0.0, 8.0, .001, p->coeffs[0], 3);
  g->scale_g = dt_bauhaus_slider_new_with_range(self, 0.0, 8.0, .001, p->coeffs[1], 3);
  g->scale_b = dt_bauhaus_slider_new_with_range(self, 0.0, 8.0, .001, p->coeffs[2], 3);
  dt_bauhaus_slider_set_format(g->scale_k, "%.0fK");
  dt_bauhaus_widget_set_label(g->scale_tint, NULL, _("tint"));
  dt_bauhaus_widget_set_label(g->scale_k, NULL, _("temperature"));
  dt_bauhaus_widget_set_label(g->scale_r, NULL, _("red"));
  dt_bauhaus_widget_set_label(g->scale_g, NULL, _("green"));
  dt_bauhaus_widget_set_label(g->scale_b, NULL, _("blue"));

  gtk_box_pack_start(GTK_BOX(self->widget), g->scale_tint, TRUE, TRUE, 0);
  gtk_box_pack_start(GTK_BOX(self->widget), g->scale_k, TRUE, TRUE, 0);

  gtk_box_pack_start(GTK_BOX(self->widget), g->scale_r, TRUE, TRUE, 0);
  gtk_box_pack_start(GTK_BOX(self->widget), g->scale_g, TRUE, TRUE, 0);
  gtk_box_pack_start(GTK_BOX(self->widget), g->scale_b, TRUE, TRUE, 0);

  g->presets = dt_bauhaus_combobox_new(self);
  dt_bauhaus_widget_set_label(g->presets, NULL, _("preset"));
  gtk_box_pack_start(GTK_BOX(self->widget), g->presets, TRUE, TRUE, 0);
  g_object_set(G_OBJECT(g->presets), "tooltip-text", _("choose white balance preset from camera"),
               (char *)NULL);

  g->finetune = dt_bauhaus_slider_new_with_range(self, -9.0, 9.0, 1.0, 0.0, 0);
  dt_bauhaus_widget_set_label(g->finetune, NULL, _("finetune"));
  dt_bauhaus_slider_set_format(g->finetune, _("%.0f mired"));
  // initially doesn't have fine tuning stuff (camera wb)
  gtk_widget_set_sensitive(g->finetune, FALSE);
  gtk_box_pack_start(GTK_BOX(self->widget), g->finetune, TRUE, TRUE, 0);
  g_object_set(G_OBJECT(g->finetune), "tooltip-text", _("fine tune white balance preset"), (char *)NULL);

  self->gui_update(self);

  g_signal_connect(G_OBJECT(g->scale_tint), "value-changed", G_CALLBACK(tint_callback), self);
  g_signal_connect(G_OBJECT(g->scale_k), "value-changed", G_CALLBACK(temp_callback), self);
  g_signal_connect(G_OBJECT(g->scale_r), "value-changed", G_CALLBACK(rgb_callback), self);
  g_signal_connect(G_OBJECT(g->scale_g), "value-changed", G_CALLBACK(rgb_callback), self);
  g_signal_connect(G_OBJECT(g->scale_b), "value-changed", G_CALLBACK(rgb_callback), self);
  g_signal_connect(G_OBJECT(g->presets), "value-changed", G_CALLBACK(presets_changed), self);
  g_signal_connect(G_OBJECT(g->finetune), "value-changed", G_CALLBACK(finetune_changed), self);
}

void gui_cleanup(struct dt_iop_module_t *self)
{
  self->request_color_pick = DT_REQUEST_COLORPICK_OFF;
  free(self->gui_data);
  self->gui_data = NULL;
}

// modelines: These editor modelines have been set for all relevant files by tools/update_modelines.sh
// vim: shiftwidth=2 expandtab tabstop=2 cindent
// kate: tab-indents: off; indent-width 2; replace-tabs on; indent-mode cstyle; remove-trailing-space on;