gimp/app/hue_saturation.c

/* The GIMP -- an image manipulation program
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
 * This program 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 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "appenv.h"
#include "actionarea.h"
#include "colormaps.h"
#include "drawable.h"
#include "general.h"
#include "gimage_mask.h"
#include "gdisplay.h"
#include "hue_saturation.h"
#include "interface.h"

#include "libgimp/gimpintl.h"

#define HUE_PARTITION_MASK  GDK_EXPOSURE_MASK | GDK_ENTER_NOTIFY_MASK

#define TEXT_WIDTH  45
#define TEXT_HEIGHT 25
#define SLIDER_WIDTH  200
#define SLIDER_HEIGHT 35
#define DA_WIDTH  40
#define DA_HEIGHT 20

#define HUE_PARTITION     0x0
#define HUE_SLIDER        0x1
#define LIGHTNESS_SLIDER  0x2
#define SATURATION_SLIDER 0x4
#define HUE_TEXT          0x8
#define LIGHTNESS_TEXT    0x10
#define SATURATION_TEXT   0x20
#define DRAW              0x40
#define ALL               0xFF

/*  the hue-saturation structures  */

typedef struct _HueSaturation HueSaturation;
struct _HueSaturation
{
  int x, y;    /*  coords for last mouse click  */
};

/*  the hue-saturation tool options  */
static ToolOptions *hue_saturation_options = NULL;

/*  the hue-saturation tool dialog  */
static HueSaturationDialog *hue_saturation_dialog = NULL;

/*  Local variables  */
static int hue_transfer[6][256];
static int lightness_transfer[6][256];
static int saturation_transfer[6][256];
static int default_colors[6][3] =
{
  { 255, 0, 0 },
  { 255, 255, 0 },
  { 0, 255, 0 },
  { 0, 255, 255 },
  { 0, 0, 255 },
  { 255, 0, 255 }
};


/*  hue saturation action functions  */
static void   hue_saturation_button_press   (Tool *, GdkEventButton *, gpointer);
static void   hue_saturation_button_release (Tool *, GdkEventButton *, gpointer);
static void   hue_saturation_motion         (Tool *, GdkEventMotion *, gpointer);
static void   hue_saturation_cursor_update  (Tool *, GdkEventMotion *, gpointer);
static void   hue_saturation_control        (Tool *, int, gpointer);

static HueSaturationDialog *  hue_saturation_new_dialog        (void);
static void   hue_saturation_update                  (HueSaturationDialog *, int);
static void   hue_saturation_preview                 (HueSaturationDialog *);
static void   hue_saturation_ok_callback             (GtkWidget *, gpointer);
static void   hue_saturation_cancel_callback         (GtkWidget *, gpointer);
static gint   hue_saturation_delete_callback         (GtkWidget *, GdkEvent *, gpointer);
static void   hue_saturation_master_callback         (GtkWidget *, gpointer);
static void   hue_saturation_R_callback              (GtkWidget *, gpointer);
static void   hue_saturation_Y_callback              (GtkWidget *, gpointer);
static void   hue_saturation_G_callback              (GtkWidget *, gpointer);
static void   hue_saturation_C_callback              (GtkWidget *, gpointer);
static void   hue_saturation_B_callback              (GtkWidget *, gpointer);
static void   hue_saturation_M_callback              (GtkWidget *, gpointer);
static void   hue_saturation_preview_update          (GtkWidget *, gpointer);
static void   hue_saturation_hue_scale_update        (GtkAdjustment *, gpointer);
static void   hue_saturation_lightness_scale_update  (GtkAdjustment *, gpointer);
static void   hue_saturation_saturation_scale_update (GtkAdjustment *, gpointer);
static void   hue_saturation_hue_text_update         (GtkWidget *, gpointer);
static void   hue_saturation_lightness_text_update   (GtkWidget *, gpointer);
static void   hue_saturation_saturation_text_update  (GtkWidget *, gpointer);
static gint   hue_saturation_hue_partition_events    (GtkWidget *, GdkEvent *, HueSaturationDialog *);


/*  hue saturation machinery  */

void
hue_saturation_calculate_transfers (HueSaturationDialog *hsd)
{
  int value;
  int hue;
  int i;

  /*  Calculate transfers  */
  for (hue = 0; hue < 6; hue++)
    for (i = 0; i < 256; i++)
      {
	value = (hsd->hue[0] + hsd->hue[hue + 1]) * 255.0 / 360.0;
	if ((i + value) < 0)
	  hue_transfer[hue][i] = 255 + (i + value);
	else if ((i + value) > 255)
	  hue_transfer[hue][i] = i + value - 255;
	else
	  hue_transfer[hue][i] = i + value;

	/*  Lightness  */
	value = (hsd->lightness[0] + hsd->lightness[hue + 1]) * 127.0 / 100.0;
	value = BOUNDS (value, -255, 255);
	if (value < 0)
	  lightness_transfer[hue][i] = (unsigned char) ((i * (255 + value)) / 255);
	else
	  lightness_transfer[hue][i] = (unsigned char) (i + ((255 - i) * value) / 255);

	/*  Saturation  */
	value = (hsd->saturation[0] + hsd->saturation[hue + 1]) * 255.0 / 100.0;
	value = BOUNDS (value, -255, 255);

	/* This change affects the way saturation is computed. With the
	   old code (different code for value < 0), increasing the
	   saturation affected muted colors very much, and bright colors
	   less. With the new code, it affects muted colors and bright
	   colors more or less evenly. For enhancing the color in photos,
	   the new behavior is exactly what you want. It's hard for me
	   to imagine a case in which the old behavior is better.
	*/
	saturation_transfer[hue][i] = BOUNDS((i * (255 + value)) / 255, 0, 255);
      }
}

void
hue_saturation (PixelRegion *srcPR,
		PixelRegion *destPR,
		void        *user_data)
{
  HueSaturationDialog *hsd;
  unsigned char *src, *s;
  unsigned char *dest, *d;
  int alpha;
  int w, h;
  int r, g, b;
  int hue;

  hsd = (HueSaturationDialog *) user_data;

  /*  Set the transfer arrays  (for speed)  */
  h = srcPR->h;
  src = srcPR->data;
  dest = destPR->data;
  alpha = (srcPR->bytes == 4) ? TRUE : FALSE;

  while (h--)
    {
      w = srcPR->w;
      s = src;
      d = dest;
      while (w--)
	{
	  r = s[RED_PIX];
	  g = s[GREEN_PIX];
	  b = s[BLUE_PIX];

	  rgb_to_hls (&r, &g, &b);

	  if (r < 43)
	    hue = 0;
	  else if (r < 85)
	    hue = 1;
	  else if (r < 128)
	    hue = 2;
	  else if (r < 171)
	    hue = 3;
	  else if (r < 213)
	    hue = 4;
	  else
	    hue = 5;

	  r = hue_transfer[hue][r];
	  g = lightness_transfer[hue][g];
	  b = saturation_transfer[hue][b];

	  hls_to_rgb (&r, &g, &b);

	  d[RED_PIX] = r;
	  d[GREEN_PIX] = g;
	  d[BLUE_PIX] = b;

	  if (alpha)
	    d[ALPHA_PIX] = s[ALPHA_PIX];

	  s += srcPR->bytes;
	  d += destPR->bytes;
	}

      src += srcPR->rowstride;
      dest += destPR->rowstride;
    }
}


/*  by_color select action functions  */

static void
hue_saturation_button_press (Tool           *tool,
			     GdkEventButton *bevent,
			     gpointer        gdisp_ptr)
{
  GDisplay *gdisp;

  gdisp = gdisp_ptr;
  tool->drawable = gimage_active_drawable (gdisp->gimage);
}

static void
hue_saturation_button_release (Tool           *tool,
			       GdkEventButton *bevent,
			       gpointer        gdisp_ptr)
{
}

static void
hue_saturation_motion (Tool           *tool,
		       GdkEventMotion *mevent,
		       gpointer        gdisp_ptr)
{
}

static void
hue_saturation_cursor_update (Tool           *tool,
			      GdkEventMotion *mevent,
			      gpointer        gdisp_ptr)
{
  GDisplay *gdisp;

  gdisp = (GDisplay *) gdisp_ptr;
  gdisplay_install_tool_cursor (gdisp, GDK_TOP_LEFT_ARROW);
}

static void
hue_saturation_control (Tool     *tool,
			int       action,
			gpointer  gdisp_ptr)
{
  HueSaturation * color_bal;

  color_bal = (HueSaturation *) tool->private;

  switch (action)
    {
    case PAUSE :
      break;
    case RESUME :
      break;
    case HALT :
      if (hue_saturation_dialog)
	{
	  active_tool->preserve = TRUE;
	  image_map_abort (hue_saturation_dialog->image_map);
	  active_tool->preserve = FALSE;
	  hue_saturation_dialog->image_map = NULL;
	  hue_saturation_cancel_callback (NULL, (gpointer) hue_saturation_dialog);
	}
      break;
    }
}

Tool *
tools_new_hue_saturation ()
{
  Tool * tool;
  HueSaturation * private;

  /*  The tool options  */
  if (!hue_saturation_options)
    {
      hue_saturation_options = tool_options_new (_("Hue-Saturation Options"));
      tools_register (HUE_SATURATION, hue_saturation_options);
    }

  tool = (Tool *) g_malloc (sizeof (Tool));
  private = (HueSaturation *) g_malloc (sizeof (HueSaturation));

  tool->type = HUE_SATURATION;
  tool->state = INACTIVE;
  tool->scroll_lock = 1;  /*  Disallow scrolling  */
  tool->auto_snap_to = TRUE;
  tool->private = (void *) private;

  tool->button_press_func = hue_saturation_button_press;
  tool->button_release_func = hue_saturation_button_release;
  tool->motion_func = hue_saturation_motion;
  tool->arrow_keys_func = standard_arrow_keys_func;  tool->modifier_key_func = standard_modifier_key_func;
  tool->cursor_update_func = hue_saturation_cursor_update;
  tool->control_func = hue_saturation_control;
  tool->preserve = FALSE;
  tool->gdisp_ptr = NULL;
  tool->drawable = NULL;

  return tool;
}

void
tools_free_hue_saturation (Tool *tool)
{
  HueSaturation * color_bal;

  color_bal = (HueSaturation *) tool->private;

  /*  Close the color select dialog  */
  if (hue_saturation_dialog)
    hue_saturation_cancel_callback (NULL, (gpointer) hue_saturation_dialog);

  g_free (color_bal);
}

void
hue_saturation_initialize (GDisplay *gdisp)
{
  int i;

  if (! drawable_color (gimage_active_drawable (gdisp->gimage)))
    {
      g_message (_("Hue-Saturation operates only on RGB color drawables."));
      return;
    }

  /*  The "by color" dialog  */
  if (!hue_saturation_dialog)
    hue_saturation_dialog = hue_saturation_new_dialog ();
  else
    if (!GTK_WIDGET_VISIBLE (hue_saturation_dialog->shell))
      gtk_widget_show (hue_saturation_dialog->shell);

  for (i = 0; i < 7; i++)
    {
      hue_saturation_dialog->hue[i] = 0.0;
      hue_saturation_dialog->lightness[i] = 0.0;
      hue_saturation_dialog->saturation[i] = 0.0;
    }

  hue_saturation_dialog->drawable = gimage_active_drawable (gdisp->gimage);
  hue_saturation_dialog->image_map = image_map_create (gdisp, hue_saturation_dialog->drawable);
  hue_saturation_update (hue_saturation_dialog, ALL);
}

void
hue_saturation_free ()
{
  if (hue_saturation_dialog)
    {
      if (hue_saturation_dialog->image_map)
	{
	  active_tool->preserve = TRUE;
	  image_map_abort (hue_saturation_dialog->image_map);
	  active_tool->preserve = FALSE;
	  hue_saturation_dialog->image_map = NULL;
	}
      gtk_widget_destroy (hue_saturation_dialog->shell);
    }
}

/****************************/
/*  Select by Color dialog  */
/****************************/

static HueSaturationDialog *
hue_saturation_new_dialog ()
{
  HueSaturationDialog *hsd;
  GtkWidget *main_vbox;
  GtkWidget *main_hbox;
  GtkWidget *vbox;
  GtkWidget *hbox;
  GtkWidget *table;
  GtkWidget *label;
  GtkWidget *slider;
  GtkWidget *toggle;
  GtkWidget *radio_button;
  GtkWidget *frame;
  GtkObject *data;
  GSList *group = NULL;
  int i;

  static ActionAreaItem action_items[] =
  {
    { N_("OK"), hue_saturation_ok_callback, NULL, NULL },
    { N_("Cancel"), hue_saturation_cancel_callback, NULL, NULL }
  };
  char *hue_partition_names[7] =
  {
    N_("Master"),
    N_("R"),
    N_("Y"),
    N_("G"),
    N_("C"),
    N_("B"),
    N_("M")
  };
  ActionCallback hue_partition_callbacks[7] =
  {
    hue_saturation_master_callback,
    hue_saturation_R_callback,
    hue_saturation_Y_callback,
    hue_saturation_G_callback,
    hue_saturation_C_callback,
    hue_saturation_B_callback,
    hue_saturation_M_callback
  };

  hsd = g_malloc (sizeof (HueSaturationDialog));
  hsd->hue_partition = 0;
  hsd->preview = TRUE;

  /*  The shell and main vbox  */
  hsd->shell = gtk_dialog_new ();
  gtk_window_set_wmclass (GTK_WINDOW (hsd->shell), "hue_saturation", "Gimp");
  gtk_window_set_title (GTK_WINDOW (hsd->shell), _("Hue-Saturation"));
  
  /* handle the wm close signal */
  gtk_signal_connect (GTK_OBJECT (hsd->shell), "delete_event",
		      GTK_SIGNAL_FUNC (hue_saturation_delete_callback),
		      hsd);

  main_vbox = gtk_vbox_new (FALSE, 2);
  gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 2);
  gtk_box_pack_start (GTK_BOX (GTK_DIALOG (hsd->shell)->vbox), main_vbox, TRUE, TRUE, 0);

  /*  The main hbox containing hue partitions and sliders  */
  main_hbox = gtk_hbox_new (FALSE, 2);
  gtk_box_pack_start (GTK_BOX (main_vbox), main_hbox, FALSE, FALSE, 0);

  /*  The table containing hue partitions  */
  table = gtk_table_new (7, 2, FALSE);
  gtk_box_pack_start (GTK_BOX (main_hbox), table, FALSE, FALSE, 0);

  /*  the radio buttons for hue partitions  */
  for (i = 0; i < 7; i++)
    {
      radio_button = gtk_radio_button_new_with_label (group, hue_partition_names[i]);
      group = gtk_radio_button_group (GTK_RADIO_BUTTON (radio_button));

      if (!i)
	{
	  gtk_table_attach (GTK_TABLE (table), radio_button, 0, 2, 0, 1,
			    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 2, 2);
	}
      else
	{
	  gtk_table_attach (GTK_TABLE (table), radio_button, 0, 1, i, i + 1,
			    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 2, 2);

	  frame = gtk_frame_new (NULL);
	  gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
	  gtk_table_attach (GTK_TABLE (table), frame,  1, 2, i, i + 1,
			    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 2, 2);
	  hsd->hue_partition_da[i - 1] = gtk_preview_new (GTK_PREVIEW_COLOR);
	  gtk_preview_size (GTK_PREVIEW (hsd->hue_partition_da[i - 1]), DA_WIDTH, DA_HEIGHT);
	  gtk_widget_set_events (hsd->hue_partition_da[i - 1], HUE_PARTITION_MASK);
	  gtk_signal_connect (GTK_OBJECT (hsd->hue_partition_da[i - 1]), "event",
			      (GtkSignalFunc) hue_saturation_hue_partition_events,
			      hsd);
	  gtk_container_add (GTK_CONTAINER (frame), hsd->hue_partition_da[i - 1]);

	  gtk_widget_show (hsd->hue_partition_da[i - 1]);
	  gtk_widget_show (frame);
	}

      gtk_signal_connect (GTK_OBJECT (radio_button), "toggled",
			  (GtkSignalFunc) hue_partition_callbacks[i],
			  hsd);
      gtk_widget_show (radio_button);
    }
  gtk_widget_show (table);

  /*  The vbox for the table and preview toggle  */
  vbox = gtk_vbox_new (FALSE, 2);
  gtk_box_pack_start (GTK_BOX (main_hbox), vbox, FALSE, FALSE, 0);

  label = gtk_label_new (_("Hue / Lightness / Saturation Adjustments"));
  gtk_misc_set_alignment (GTK_MISC (label), 0.5, 0.5);
  gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);
  gtk_widget_show (label);

  /*  The table containing sliders  */
  table = gtk_table_new (3, 3, FALSE);
  gtk_box_pack_start (GTK_BOX (vbox), table, FALSE, FALSE, 0);

  /*  Create the hue scale widget  */
  label = gtk_label_new (_("Hue"));
  gtk_misc_set_alignment (GTK_MISC (label), 1.0, 1.0);
  gtk_table_attach (GTK_TABLE (table), label, 0, 1, 0, 1,
		    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 2, 2);

  data = gtk_adjustment_new (0, -180, 180.0, 1.0, 1.0, 0.0);
  hsd->hue_data = GTK_ADJUSTMENT (data);
  slider = gtk_hscale_new (GTK_ADJUSTMENT (data));
  gtk_widget_set_usize (slider, SLIDER_WIDTH, SLIDER_HEIGHT);
  gtk_scale_set_digits (GTK_SCALE (slider), 0);
  gtk_scale_set_value_pos (GTK_SCALE (slider), GTK_POS_TOP);
  gtk_range_set_update_policy (GTK_RANGE (slider), GTK_UPDATE_DELAYED);
  gtk_table_attach (GTK_TABLE (table), slider, 1, 2, 0, 1,
		    GTK_EXPAND | GTK_SHRINK | GTK_FILL,
		    GTK_EXPAND | GTK_SHRINK | GTK_FILL,
		    2, 2);
  gtk_signal_connect (GTK_OBJECT (data), "value_changed",
		      (GtkSignalFunc) hue_saturation_hue_scale_update,
		      hsd);

  hsd->hue_text = gtk_entry_new ();
  gtk_widget_set_usize (hsd->hue_text, TEXT_WIDTH, TEXT_HEIGHT);
  gtk_table_attach (GTK_TABLE (table), hsd->hue_text, 2, 3, 0, 1,
		    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 2, 2);
  gtk_signal_connect (GTK_OBJECT (hsd->hue_text), "changed",
		      (GtkSignalFunc) hue_saturation_hue_text_update,
		      hsd);

  gtk_widget_show (label);
  gtk_widget_show (hsd->hue_text);
  gtk_widget_show (slider);


  /*  Create the lightness scale widget  */
  label = gtk_label_new (_("Lightness"));
  gtk_misc_set_alignment (GTK_MISC (label), 1.0, 1.0);
  gtk_table_attach (GTK_TABLE (table), label, 0, 1, 1, 2,
		    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 2, 2);

  data = gtk_adjustment_new (0, -100.0, 100.0, 1.0, 1.0, 0.0);
  hsd->lightness_data = GTK_ADJUSTMENT (data);
  slider = gtk_hscale_new (GTK_ADJUSTMENT (data));
  gtk_widget_set_usize (slider, SLIDER_WIDTH, SLIDER_HEIGHT);
  gtk_scale_set_digits (GTK_SCALE (slider), 0);
  gtk_scale_set_value_pos (GTK_SCALE (slider), GTK_POS_TOP);
  gtk_range_set_update_policy (GTK_RANGE (slider), GTK_UPDATE_DELAYED);
  gtk_table_attach (GTK_TABLE (table), slider, 1, 2, 1, 2,
		    GTK_EXPAND | GTK_SHRINK | GTK_FILL,
		    GTK_EXPAND | GTK_SHRINK | GTK_FILL,
		    2, 2);
  gtk_signal_connect (GTK_OBJECT (data), "value_changed",
		      (GtkSignalFunc) hue_saturation_lightness_scale_update,
		      hsd);

  hsd->lightness_text = gtk_entry_new ();
  gtk_widget_set_usize (hsd->lightness_text, TEXT_WIDTH, TEXT_HEIGHT);
  gtk_table_attach (GTK_TABLE (table), hsd->lightness_text, 2, 3, 1, 2,
		    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 2, 2);
  gtk_signal_connect (GTK_OBJECT (hsd->lightness_text), "changed",
		      (GtkSignalFunc) hue_saturation_lightness_text_update,
		      hsd);

  gtk_widget_show (label);
  gtk_widget_show (hsd->lightness_text);
  gtk_widget_show (slider);


  /*  Create the saturation scale widget  */
  label = gtk_label_new (_("Saturation"));
  gtk_misc_set_alignment (GTK_MISC (label), 1.0, 1.0);
  gtk_table_attach (GTK_TABLE (table), label, 0, 1, 2, 3,
		    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 2, 2);

  data = gtk_adjustment_new (0, -100.0, 100.0, 1.0, 1.0, 0.0);
  hsd->saturation_data = GTK_ADJUSTMENT (data);
  slider = gtk_hscale_new (GTK_ADJUSTMENT (data));
  gtk_widget_set_usize (slider, SLIDER_WIDTH, SLIDER_HEIGHT);
  gtk_scale_set_digits (GTK_SCALE (slider), 0);
  gtk_scale_set_value_pos (GTK_SCALE (slider), GTK_POS_TOP);
  gtk_range_set_update_policy (GTK_RANGE (slider), GTK_UPDATE_DELAYED);
  gtk_table_attach (GTK_TABLE (table), slider, 1, 2, 2, 3,
		    GTK_EXPAND | GTK_SHRINK | GTK_FILL,
		    GTK_EXPAND | GTK_SHRINK | GTK_FILL,
		    2, 2);
  gtk_signal_connect (GTK_OBJECT (data), "value_changed",
		      (GtkSignalFunc) hue_saturation_saturation_scale_update,
		      hsd);

  hsd->saturation_text = gtk_entry_new ();
  gtk_widget_set_usize (hsd->saturation_text, TEXT_WIDTH, TEXT_HEIGHT);
  gtk_table_attach (GTK_TABLE (table), hsd->saturation_text, 2, 3, 2, 3,
		    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 3, 2);
  gtk_signal_connect (GTK_OBJECT (hsd->saturation_text), "changed",
		      (GtkSignalFunc) hue_saturation_saturation_text_update,
		      hsd);

  gtk_widget_show (label);
  gtk_widget_show (hsd->saturation_text);
  gtk_widget_show (slider);


  /*  Horizontal box for preview and colorize toggle buttons  */
  hbox = gtk_hbox_new (TRUE, 2);
  gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);

  /*  The preview toggle  */
  toggle = gtk_check_button_new_with_label (_("Preview"));
  gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), hsd->preview);
  gtk_box_pack_start (GTK_BOX (hbox), toggle, FALSE, FALSE, 0);
  gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
		      (GtkSignalFunc) hue_saturation_preview_update,
		      hsd);

  gtk_widget_show (toggle);
  gtk_widget_show (hbox);


  /*  The action area  */
  action_items[0].user_data = hsd;
  action_items[1].user_data = hsd;
  build_action_area (GTK_DIALOG (hsd->shell), action_items, 2, 0);

  gtk_widget_show (table);
  gtk_widget_show (vbox);
  gtk_widget_show (main_hbox);
  gtk_widget_show (main_vbox);
  gtk_widget_show (hsd->shell);

  return hsd;
}

static void
hue_saturation_update (HueSaturationDialog *hsd,
		       int                  update)
{
  int i, j, b;
  int rgb[3];
  unsigned char buf[DA_WIDTH * 3];
  char text[12];

  if (update & HUE_SLIDER)
    {
      hsd->hue_data->value = hsd->hue[hsd->hue_partition];
      gtk_signal_emit_by_name (GTK_OBJECT (hsd->hue_data), "value_changed");
    }
  if (update & LIGHTNESS_SLIDER)
    {
      hsd->lightness_data->value = hsd->lightness[hsd->hue_partition];
      gtk_signal_emit_by_name (GTK_OBJECT (hsd->lightness_data), "value_changed");
    }
  if (update & SATURATION_SLIDER)
    {
      hsd->saturation_data->value = hsd->saturation[hsd->hue_partition];
      gtk_signal_emit_by_name (GTK_OBJECT (hsd->saturation_data), "value_changed");
    }
  if (update & HUE_TEXT)
    {
      sprintf (text, "%0.0f", hsd->hue[hsd->hue_partition]);
      gtk_entry_set_text (GTK_ENTRY (hsd->hue_text), text);
    }
  if (update & LIGHTNESS_TEXT)
    {
      sprintf (text, "%0.0f", hsd->lightness[hsd->hue_partition]);
      gtk_entry_set_text (GTK_ENTRY (hsd->lightness_text), text);
    }
  if (update & SATURATION_TEXT)
    {
      sprintf (text, "%0.0f", hsd->saturation[hsd->hue_partition]);
      gtk_entry_set_text (GTK_ENTRY (hsd->saturation_text), text);
    }

  hue_saturation_calculate_transfers (hsd);

  for (i = 0; i < 6; i++)
    {
      rgb[RED_PIX] = default_colors[i][RED_PIX];
      rgb[GREEN_PIX] = default_colors[i][GREEN_PIX];
      rgb[BLUE_PIX] = default_colors[i][BLUE_PIX];

      rgb_to_hls (rgb, rgb + 1, rgb + 2);

      rgb[RED_PIX] = hue_transfer[i][rgb[RED_PIX]];
      rgb[GREEN_PIX] = lightness_transfer[i][rgb[GREEN_PIX]];
      rgb[BLUE_PIX] = saturation_transfer[i][rgb[BLUE_PIX]];

      hls_to_rgb (rgb, rgb + 1, rgb + 2);

      for (j = 0; j < DA_WIDTH; j++)
	for (b = 0; b < 3; b++)
	  buf[j * 3 + b] = (unsigned char) rgb[b];

      for (j = 0; j < DA_HEIGHT; j++)
	gtk_preview_draw_row (GTK_PREVIEW (hsd->hue_partition_da[i]), buf, 0, j, DA_WIDTH);

      if (update & DRAW)
	gtk_widget_draw (hsd->hue_partition_da[i], NULL);
    }
}

static void
hue_saturation_preview (HueSaturationDialog *hsd)
{
  if (!hsd->image_map)
    g_warning ("hue_saturation_preview(): No image map");
  active_tool->preserve = TRUE;
  image_map_apply (hsd->image_map, hue_saturation, (void *) hsd);
  active_tool->preserve = FALSE;
}

static void
hue_saturation_ok_callback (GtkWidget *widget,
			    gpointer   client_data)
{
  HueSaturationDialog *hsd;

  hsd = (HueSaturationDialog *) client_data;

  if (GTK_WIDGET_VISIBLE (hsd->shell))
    gtk_widget_hide (hsd->shell);

  active_tool->preserve = TRUE;

  if (!hsd->preview)
    image_map_apply (hsd->image_map, hue_saturation, (void *) hsd);

  if (hsd->image_map)
    image_map_commit (hsd->image_map);

  active_tool->preserve = FALSE;

  hsd->image_map = NULL;
}

static gint
hue_saturation_delete_callback (GtkWidget *w,
				GdkEvent *e,
				gpointer client_data)
{
  hue_saturation_cancel_callback (w, client_data);

  return TRUE;
}

static void
hue_saturation_cancel_callback (GtkWidget *widget,
				gpointer   client_data)
{
  HueSaturationDialog *hsd;

  hsd = (HueSaturationDialog *) client_data;
  if (GTK_WIDGET_VISIBLE (hsd->shell))
    gtk_widget_hide (hsd->shell);

  if (hsd->image_map)
    {
      active_tool->preserve = TRUE;
      image_map_abort (hsd->image_map);
      active_tool->preserve = FALSE;
      gdisplays_flush ();
    }

  hsd->image_map = NULL;
}

static void
hue_saturation_master_callback (GtkWidget *widget,
				gpointer   client_data)
{
  HueSaturationDialog *hsd;

  hsd = (HueSaturationDialog *) client_data;
  hsd->hue_partition = 0;
  hue_saturation_update (hsd, ALL);
}

static void
hue_saturation_R_callback (GtkWidget *widget,
			   gpointer   client_data)
{
  HueSaturationDialog *hsd;

  hsd = (HueSaturationDialog *) client_data;
  hsd->hue_partition = 1;
  hue_saturation_update (hsd, ALL);
}

static void
hue_saturation_Y_callback (GtkWidget *widget,
			   gpointer   client_data)
{
  HueSaturationDialog *hsd;

  hsd = (HueSaturationDialog *) client_data;
  hsd->hue_partition = 2;
  hue_saturation_update (hsd, ALL);
}

static void
hue_saturation_G_callback (GtkWidget *widget,
			   gpointer   client_data)
{
  HueSaturationDialog *hsd;

  hsd = (HueSaturationDialog *) client_data;
  hsd->hue_partition = 3;
  hue_saturation_update (hsd, ALL);
}

static void
hue_saturation_C_callback (GtkWidget *widget,
			   gpointer   client_data)
{
  HueSaturationDialog *hsd;

  hsd = (HueSaturationDialog *) client_data;
  hsd->hue_partition = 4;
  hue_saturation_update (hsd, ALL);
}

static void
hue_saturation_B_callback (GtkWidget *widget,
			   gpointer   client_data)
{
  HueSaturationDialog *hsd;

  hsd = (HueSaturationDialog *) client_data;
  hsd->hue_partition = 5;
  hue_saturation_update (hsd, ALL);
}

static void
hue_saturation_M_callback (GtkWidget *widget,
			   gpointer   client_data)
{
  HueSaturationDialog *hsd;

  hsd = (HueSaturationDialog *) client_data;
  hsd->hue_partition = 6;
  hue_saturation_update (hsd, ALL);
}

static void
hue_saturation_preview_update (GtkWidget *w,
			       gpointer   data)
{
  HueSaturationDialog *hsd;

  hsd = (HueSaturationDialog *) data;

  if (GTK_TOGGLE_BUTTON (w)->active)
    {
      hsd->preview = TRUE;
      hue_saturation_preview (hsd);
    }
  else
    hsd->preview = FALSE;
}

static void
hue_saturation_hue_scale_update (GtkAdjustment *adjustment,
				 gpointer       data)
{
  HueSaturationDialog *hsd;

  hsd = (HueSaturationDialog *) data;

  if (hsd->hue[hsd->hue_partition] != adjustment->value)
    {
      hsd->hue[hsd->hue_partition] = adjustment->value;
      hue_saturation_update (hsd, HUE_TEXT | DRAW);

      if (hsd->preview)
	hue_saturation_preview (hsd);
    }
}

static void
hue_saturation_lightness_scale_update (GtkAdjustment *adjustment,
				       gpointer       data)
{
  HueSaturationDialog *hsd;

  hsd = (HueSaturationDialog *) data;

  if (hsd->lightness[hsd->hue_partition] != adjustment->value)
    {
      hsd->lightness[hsd->hue_partition] = adjustment->value;
      hue_saturation_update (hsd, LIGHTNESS_TEXT | DRAW);

      if (hsd->preview)
	hue_saturation_preview (hsd);
    }
}

static void
hue_saturation_saturation_scale_update (GtkAdjustment *adjustment,
					gpointer       data)
{
  HueSaturationDialog *hsd;

  hsd = (HueSaturationDialog *) data;

  if (hsd->saturation[hsd->hue_partition] != adjustment->value)
    {
      hsd->saturation[hsd->hue_partition] = adjustment->value;
      hue_saturation_update (hsd, SATURATION_TEXT | DRAW);

      if (hsd->preview)
	hue_saturation_preview (hsd);
    }
}

static void
hue_saturation_hue_text_update (GtkWidget *w,
				gpointer   data)
{
  HueSaturationDialog *hsd;
  char *str;
  int value;

  str = gtk_entry_get_text (GTK_ENTRY (w));
  hsd = (HueSaturationDialog *) data;
  value = BOUNDS (((int) atof (str)), -180, 180);

  if ((int) hsd->hue[hsd->hue_partition] != value)
    {
      hsd->hue[hsd->hue_partition] = value;
      hue_saturation_update (hsd, HUE_SLIDER | DRAW);

      if (hsd->preview)
	hue_saturation_preview (hsd);
    }
}

static void
hue_saturation_lightness_text_update (GtkWidget *w,
				      gpointer   data)
{
  HueSaturationDialog *hsd;
  char *str;
  int value;

  str = gtk_entry_get_text (GTK_ENTRY (w));
  hsd = (HueSaturationDialog *) data;
  value = BOUNDS (((int) atof (str)), -100, 100);

  if ((int) hsd->lightness[hsd->hue_partition] != value)
    {
      hsd->lightness[hsd->hue_partition] = value;
      hue_saturation_update (hsd, LIGHTNESS_SLIDER | DRAW);

      if (hsd->preview)
	hue_saturation_preview (hsd);
    }
}

static void
hue_saturation_saturation_text_update (GtkWidget *w,
				       gpointer   data)
{
  HueSaturationDialog *hsd;
  char *str;
  int value;

  str = gtk_entry_get_text (GTK_ENTRY (w));
  hsd = (HueSaturationDialog *) data;
  value = BOUNDS (((int) atof (str)), -100, 100);

  if ((int) hsd->saturation[hsd->hue_partition] != value)
    {
      hsd->saturation[hsd->hue_partition] = value;
      hue_saturation_update (hsd, SATURATION_SLIDER | DRAW);

      if (hsd->preview)
	hue_saturation_preview (hsd);
    }
}

static gint
hue_saturation_hue_partition_events (GtkWidget           *widget,
				     GdkEvent            *event,
				     HueSaturationDialog *hsd)
{
  switch (event->type)
    {
    case GDK_EXPOSE:
      hue_saturation_update (hsd, HUE_PARTITION);
      break;

    default:
      break;
    }

  return FALSE;
}