gimp/libgimpwidgets/gimpcolorselect.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 "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>

#include "apptypes.h"

#include "appenv.h"
#include "color_select.h"
#include "colormaps.h"
#include "gimpdnd.h"
#include "gimprc.h"
#include "gimpui.h"
#include "session.h"
#include "color_area.h"

#include "libgimp/gimpcolorspace.h"
#include "libgimp/gimpcolorselector.h"
#include "libgimp/gimphelpui.h"

#include "libgimp/gimpintl.h"


#define XY_DEF_WIDTH       200
#define XY_DEF_HEIGHT      200
#define Z_DEF_WIDTH        15
#define Z_DEF_HEIGHT       200
#define COLOR_AREA_WIDTH   74
#define COLOR_AREA_HEIGHT  20

#define COLOR_AREA_MASK (GDK_EXPOSURE_MASK | \
                         GDK_BUTTON_PRESS_MASK | \
                         GDK_BUTTON_RELEASE_MASK | \
			 GDK_BUTTON1_MOTION_MASK | \
                         GDK_ENTER_NOTIFY_MASK)


typedef enum
{
  COLOR_SELECT_HUE = 0,
  COLOR_SELECT_SATURATION,
  COLOR_SELECT_VALUE,
  COLOR_SELECT_RED,
  COLOR_SELECT_GREEN,
  COLOR_SELECT_BLUE,
  COLOR_SELECT_ALPHA,
  COLOR_SELECT_HUE_SATURATION,
  COLOR_SELECT_HUE_VALUE,
  COLOR_SELECT_SATURATION_VALUE,
  COLOR_SELECT_RED_GREEN,
  COLOR_SELECT_RED_BLUE,
  COLOR_SELECT_GREEN_BLUE
} ColorSelectFillType;

typedef enum
{
  UPDATE_VALUES     = 1 << 0,
  UPDATE_POS        = 1 << 1,
  UPDATE_XY_COLOR   = 1 << 2,
  UPDATE_Z_COLOR    = 1 << 3,
  UPDATE_CALLER     = 1 << 6
} ColorSelectUpdateType;

typedef void (* ColorSelectCallback) (const GimpHSV *hsv,
				      const GimpRGB *rgb,
				      gpointer       data);

typedef struct _ColorSelect ColorSelect;

struct _ColorSelect
{
  GtkWidget *xy_color;
  GtkWidget *z_color;

  gint       pos[3];

  GimpHSV    hsv;
  GimpRGB    rgb;

  gint       z_color_fill;
  gint       xy_color_fill;
  GdkGC     *gc;

  ColorSelectCallback  callback;
  gpointer             client_data;
};

typedef struct _ColorSelectFill ColorSelectFill;

typedef void (* ColorSelectFillUpdateProc) (ColorSelectFill *color_select_fill);

struct _ColorSelectFill
{
  guchar  *buffer;
  gint     y;
  gint     width;
  gint     height;
  GimpHSV  hsv;
  GimpRGB  rgb;

  ColorSelectFillUpdateProc update;
};


static GtkWidget * color_select_widget_new   (ColorSelect    *csp,
					      const GimpRGB  *color);

static void   color_select_drop_color        (GtkWidget      *widget,
					      const GimpRGB  *color,
					      gpointer        data);
static void   color_select_update            (ColorSelect    *csp,
					      ColorSelectUpdateType);
static void   color_select_update_caller     (ColorSelect    *csp);
static void   color_select_update_values     (ColorSelect    *csp);
static void   color_select_update_rgb_values (ColorSelect    *csp);
static void   color_select_update_hsv_values (ColorSelect    *csp);
static void   color_select_update_pos        (ColorSelect    *csp);

static gint   color_select_xy_expose         (GtkWidget      *widget,
					      GdkEventExpose *eevent,
					      ColorSelect    *color_select);
static gint   color_select_xy_events         (GtkWidget      *widget,
					      GdkEvent       *event,
					      ColorSelect    *color_select);
static gint   color_select_z_expose          (GtkWidget      *widget,
					      GdkEventExpose *eevent,
					      ColorSelect    *color_select);
static gint   color_select_z_events          (GtkWidget      *widet,
					      GdkEvent       *event,
					      ColorSelect    *color_select);

static void   color_select_image_fill        (GtkWidget      *,
					      ColorSelectFillType,
					      const GimpHSV  *hsv,
					      const GimpRGB  *rgb);

static void   color_select_draw_z_marker     (ColorSelect    *csp,
					      GdkRectangle   *);
static void   color_select_draw_xy_marker    (ColorSelect    *csp,
					      GdkRectangle   *);

static void   color_select_update_red              (ColorSelectFill *csf);
static void   color_select_update_green            (ColorSelectFill *csf);
static void   color_select_update_blue             (ColorSelectFill *csf);
static void   color_select_update_hue              (ColorSelectFill *csf);
static void   color_select_update_saturation       (ColorSelectFill *csf);
static void   color_select_update_value            (ColorSelectFill *csf);
static void   color_select_update_red_green        (ColorSelectFill *csf);
static void   color_select_update_red_blue         (ColorSelectFill *csf);
static void   color_select_update_green_blue       (ColorSelectFill *csf);
static void   color_select_update_hue_saturation   (ColorSelectFill *csf);
static void   color_select_update_hue_value        (ColorSelectFill *csf);
static void   color_select_update_saturation_value (ColorSelectFill *csf);

static GtkWidget * color_select_notebook_new       (const GimpHSV *hsv,
						    const GimpRGB *rgb,
						    gboolean       show_alpha,
						    GimpColorSelectorCallback,
						    gpointer       ,
						    gpointer      *);
static void        color_select_notebook_free      (gpointer       );
static void        color_select_notebook_set_color (gpointer       ,
						    const GimpHSV *hsv,
						    const GimpRGB *rgb);
static void        color_select_notebook_set_channel (gpointer  ,
						      GimpColorSelectorChannelType  channel);
static void  color_select_notebook_update_callback (const GimpHSV *hsv,
						    const GimpRGB *rgb,
						    gpointer       );

/*  Static variables  */
static ColorSelectFillUpdateProc update_procs[] =
{
  color_select_update_hue,
  color_select_update_saturation,
  color_select_update_value,
  color_select_update_red,
  color_select_update_green,
  color_select_update_blue,
  NULL, /* alpha */
  color_select_update_hue_saturation,
  color_select_update_hue_value,
  color_select_update_saturation_value,
  color_select_update_red_green,
  color_select_update_red_blue,
  color_select_update_green_blue,
};

/*  dnd stuff  */
static GtkTargetEntry color_select_target_table[] =
{
  GIMP_TARGET_COLOR
};
static guint n_color_select_targets = (sizeof (color_select_target_table) /
				       sizeof (color_select_target_table[0]));


/*  Register the GIMP colour selector with the color notebook  */
void
color_select_init (void)
{
  GimpColorSelectorMethods methods =
  {
    color_select_notebook_new,
    color_select_notebook_free,
    color_select_notebook_set_color,
    color_select_notebook_set_channel
  };

  gimp_color_selector_register ("GIMP", "built_in.html", &methods);
}


static GtkWidget *
color_select_widget_new (ColorSelect   *csp,
			 const GimpRGB *color)
{
  GtkWidget *main_vbox;
  GtkWidget *main_hbox;
  GtkWidget *hbox;
  GtkWidget *xy_frame;
  GtkWidget *z_frame;
			
  main_vbox = gtk_vbox_new (FALSE, 0);
  gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 2);

  main_hbox = gtk_hbox_new (FALSE, 0);
  gtk_box_pack_start (GTK_BOX (main_vbox), main_hbox, TRUE, FALSE, 0);
  gtk_widget_show (main_hbox);

  hbox = gtk_hbox_new (FALSE, 2);
  gtk_box_pack_start (GTK_BOX (main_hbox), hbox, TRUE, FALSE, 0);
  gtk_widget_show (hbox);

  /*  The x/y component preview  */
  xy_frame = gtk_frame_new (NULL);
  gtk_frame_set_shadow_type (GTK_FRAME (xy_frame), GTK_SHADOW_IN);
  gtk_box_pack_start (GTK_BOX (hbox), xy_frame, FALSE, FALSE, 2);
  gtk_widget_show (xy_frame);

  csp->xy_color = gtk_preview_new (GTK_PREVIEW_COLOR);
  gtk_preview_set_dither (GTK_PREVIEW (csp->xy_color), GDK_RGB_DITHER_MAX);
  gtk_preview_size (GTK_PREVIEW (csp->xy_color), XY_DEF_WIDTH, XY_DEF_HEIGHT);
  gtk_widget_set_events (csp->xy_color, COLOR_AREA_MASK);
  gtk_signal_connect_after (GTK_OBJECT (csp->xy_color), "expose_event",
			    GTK_SIGNAL_FUNC (color_select_xy_expose),
			    csp);
  gtk_signal_connect (GTK_OBJECT (csp->xy_color), "event",
		      GTK_SIGNAL_FUNC (color_select_xy_events),
		      csp);
  gtk_container_add (GTK_CONTAINER (xy_frame), csp->xy_color);
  gtk_widget_show (csp->xy_color);

  /*  dnd stuff  */
  gtk_drag_dest_set (csp->xy_color,
                     GTK_DEST_DEFAULT_HIGHLIGHT |
                     GTK_DEST_DEFAULT_MOTION |
                     GTK_DEST_DEFAULT_DROP,
                     color_select_target_table, n_color_select_targets,
                     GDK_ACTION_COPY);
  gimp_dnd_color_dest_set (csp->xy_color, color_select_drop_color, csp);

  /*  The z component preview  */
  z_frame = gtk_frame_new (NULL);
  gtk_frame_set_shadow_type (GTK_FRAME (z_frame), GTK_SHADOW_IN);
  gtk_box_pack_start (GTK_BOX (hbox), z_frame, FALSE, FALSE, 2);
  gtk_widget_show (z_frame);

  csp->z_color = gtk_preview_new (GTK_PREVIEW_COLOR);
  gtk_preview_set_dither (GTK_PREVIEW (csp->z_color), GDK_RGB_DITHER_MAX);
  gtk_preview_size (GTK_PREVIEW (csp->z_color), Z_DEF_WIDTH, Z_DEF_HEIGHT);
  gtk_widget_set_events (csp->z_color, COLOR_AREA_MASK);
  gtk_signal_connect_after (GTK_OBJECT (csp->z_color), "expose_event",
			    GTK_SIGNAL_FUNC (color_select_z_expose),
			    csp);
  gtk_signal_connect (GTK_OBJECT (csp->z_color), "event",
		      GTK_SIGNAL_FUNC (color_select_z_events),
		      csp);
  gtk_container_add (GTK_CONTAINER (z_frame), csp->z_color);
  gtk_widget_show (csp->z_color);

  return main_vbox;
}

static void
color_select_drop_color (GtkWidget     *widget,
			 const GimpRGB *color,
			 gpointer       data)
{
  ColorSelect *csp;

  csp = (ColorSelect *) data;

  csp->rgb = *color;

  color_select_update_hsv_values (csp);
  color_select_update_pos (csp);

  color_select_update (csp, UPDATE_Z_COLOR);
  color_select_update (csp, UPDATE_XY_COLOR);

  color_select_update (csp, UPDATE_CALLER);
}

static void
color_select_set_color (ColorSelect   *csp,
			const GimpHSV *hsv,
			const GimpRGB *rgb)
{
  if (! csp)
    return;

  csp->hsv = *hsv;
  csp->rgb = *rgb;

  color_select_update_pos (csp);

  color_select_update (csp, UPDATE_Z_COLOR);
  color_select_update (csp, UPDATE_XY_COLOR);
}

static void
color_select_update (ColorSelect           *csp,
		     ColorSelectUpdateType  update)
{
  if (!csp)
    return;

  if (update & UPDATE_POS)
    color_select_update_pos (csp);

  if (update & UPDATE_VALUES)
    {
      color_select_update_values (csp);
    }

  if (update & UPDATE_XY_COLOR)
    {
      color_select_image_fill (csp->xy_color, csp->xy_color_fill,
			       &csp->hsv, &csp->rgb);
      gtk_widget_draw (csp->xy_color, NULL);
    }

  if (update & UPDATE_Z_COLOR)
    {
      color_select_image_fill (csp->z_color, csp->z_color_fill,
			       &csp->hsv, &csp->rgb);
      gtk_widget_draw (csp->z_color, NULL);
    }

  if (update & UPDATE_CALLER)
    color_select_update_caller (csp);
}

static void
color_select_update_caller (ColorSelect *csp)
{
  if (csp && csp->callback)
    {
      (* csp->callback) (&csp->hsv,
			 &csp->rgb,
			 csp->client_data);
    }
}

static void
color_select_update_values (ColorSelect *csp)
{
  if (!csp)
    return;

  switch (csp->z_color_fill)
    {
    case COLOR_SELECT_RED:
      csp->rgb.b = csp->pos[0] / 255.0;
      csp->rgb.g = csp->pos[1] / 255.0;
      csp->rgb.r = csp->pos[2] / 255.0;
      break;
    case COLOR_SELECT_GREEN:
      csp->rgb.b = csp->pos[0] / 255.0;
      csp->rgb.r = csp->pos[1] / 255.0;
      csp->rgb.g = csp->pos[2] / 255.0;
      break;
    case COLOR_SELECT_BLUE:
      csp->rgb.g = csp->pos[0] / 255.0;
      csp->rgb.r = csp->pos[1] / 255.0;
      csp->rgb.b = csp->pos[2] / 255.0;
      break;

    case COLOR_SELECT_HUE:
      csp->hsv.v = csp->pos[0] / 255.0;
      csp->hsv.s = csp->pos[1] / 255.0;
      csp->hsv.h = csp->pos[2] / 255.0;
      break;
    case COLOR_SELECT_SATURATION:
      csp->hsv.v = csp->pos[0] / 255.0;
      csp->hsv.h = csp->pos[1] / 255.0;
      csp->hsv.s = csp->pos[2] / 255.0;
      break;
    case COLOR_SELECT_VALUE:
      csp->hsv.s = csp->pos[0] / 255.0;
      csp->hsv.h = csp->pos[1] / 255.0;
      csp->hsv.v = csp->pos[2] / 255.0;
      break;
    }

  switch (csp->z_color_fill)
    {
    case COLOR_SELECT_RED:
    case COLOR_SELECT_GREEN:
    case COLOR_SELECT_BLUE:
      color_select_update_hsv_values (csp);
      break;

    case COLOR_SELECT_HUE:
    case COLOR_SELECT_SATURATION:
    case COLOR_SELECT_VALUE:
      color_select_update_rgb_values (csp);
      break;
    }
}

static void
color_select_update_rgb_values (ColorSelect *csp)
{
  if (! csp)
    return;

  gimp_hsv_to_rgb (&csp->hsv, &csp->rgb);
}

static void
color_select_update_hsv_values (ColorSelect *csp)
{
  if (! csp)
    return;

  gimp_rgb_to_hsv (&csp->rgb, &csp->hsv);
}

static void
color_select_update_pos (ColorSelect *csp)
{
  if (! csp)
    return;

  switch (csp->z_color_fill)
    {
    case COLOR_SELECT_RED:
      csp->pos[0] = (gint) (csp->rgb.b * 255.999);
      csp->pos[1] = (gint) (csp->rgb.g * 255.999);
      csp->pos[2] = (gint) (csp->rgb.r * 255.999);
      break;
    case COLOR_SELECT_GREEN:
      csp->pos[0] = (gint) (csp->rgb.b * 255.999);
      csp->pos[1] = (gint) (csp->rgb.r * 255.999);
      csp->pos[2] = (gint) (csp->rgb.g * 255.999);
      break;
    case COLOR_SELECT_BLUE:
      csp->pos[0] = (gint) (csp->rgb.g * 255.999);
      csp->pos[1] = (gint) (csp->rgb.r * 255.999);
      csp->pos[2] = (gint) (csp->rgb.b * 255.999);
      break;

    case COLOR_SELECT_HUE:
      csp->pos[0] = (gint) (csp->hsv.v * 255.999);
      csp->pos[1] = (gint) (csp->hsv.s * 255.999);
      csp->pos[2] = (gint) (csp->hsv.h * 255.999);
      break;
    case COLOR_SELECT_SATURATION:
      csp->pos[0] = (gint) (csp->hsv.v * 255.999);
      csp->pos[1] = (gint) (csp->hsv.h * 255.999);
      csp->pos[2] = (gint) (csp->hsv.s * 255.999);
      break;
    case COLOR_SELECT_VALUE:
      csp->pos[0] = (gint) (csp->hsv.s * 255.999);
      csp->pos[1] = (gint) (csp->hsv.h * 255.999);
      csp->pos[2] = (gint) (csp->hsv.v * 255.999);
      break;
    }
}

static gint
color_select_xy_expose (GtkWidget      *widget,
			GdkEventExpose *event,
			ColorSelect    *csp)
{
  if (! csp->gc)
    csp->gc = gdk_gc_new (widget->window);

  color_select_draw_xy_marker (csp, &event->area);

  return FALSE;
}

static gint
color_select_xy_events (GtkWidget   *widget,
			GdkEvent    *event,
			ColorSelect *csp)
{
  GdkEventButton *bevent;
  GdkEventMotion *mevent;
  gint            tx, ty;

  switch (event->type)
    {
    case GDK_BUTTON_PRESS:
      bevent = (GdkEventButton *) event;

      color_select_draw_xy_marker (csp, NULL);

      csp->pos[0] = (bevent->x * 255) / (XY_DEF_WIDTH - 1);
      csp->pos[1] = 255 - (bevent->y * 255) / (XY_DEF_HEIGHT - 1);

      if (csp->pos[0] < 0)
	csp->pos[0] = 0;
      if (csp->pos[0] > 255)
	csp->pos[0] = 255;
      if (csp->pos[1] < 0)
	csp->pos[1] = 0;
      if (csp->pos[1] > 255)
	csp->pos[1] = 255;

      gdk_pointer_grab (csp->xy_color->window, FALSE,
			GDK_POINTER_MOTION_HINT_MASK |
			GDK_BUTTON1_MOTION_MASK      |
			GDK_BUTTON_RELEASE_MASK,
			NULL, NULL, bevent->time);
      color_select_draw_xy_marker (csp, NULL);

      color_select_update (csp, UPDATE_VALUES | UPDATE_CALLER);
      break;

    case GDK_BUTTON_RELEASE:
      bevent = (GdkEventButton *) event;

      color_select_draw_xy_marker (csp, NULL);

      csp->pos[0] = (bevent->x * 255) / (XY_DEF_WIDTH - 1);
      csp->pos[1] = 255 - (bevent->y * 255) / (XY_DEF_HEIGHT - 1);

      if (csp->pos[0] < 0)
	csp->pos[0] = 0;
      if (csp->pos[0] > 255)
	csp->pos[0] = 255;
      if (csp->pos[1] < 0)
	csp->pos[1] = 0;
      if (csp->pos[1] > 255)
	csp->pos[1] = 255;

      gdk_pointer_ungrab (bevent->time);
      color_select_draw_xy_marker (csp, NULL);
      color_select_update (csp, UPDATE_VALUES | UPDATE_CALLER);
      break;

    case GDK_MOTION_NOTIFY:
      mevent = (GdkEventMotion *) event;
      if (mevent->is_hint)
	{
	  gdk_window_get_pointer (widget->window, &tx, &ty, NULL);
	  mevent->x = tx;
	  mevent->y = ty;
	}

      color_select_draw_xy_marker (csp, NULL);

      csp->pos[0] = (mevent->x * 255) / (XY_DEF_WIDTH - 1);
      csp->pos[1] = 255 - (mevent->y * 255) / (XY_DEF_HEIGHT - 1);

      if (csp->pos[0] < 0)
	csp->pos[0] = 0;
      if (csp->pos[0] > 255)
	csp->pos[0] = 255;
      if (csp->pos[1] < 0)
	csp->pos[1] = 0;
      if (csp->pos[1] > 255)
	csp->pos[1] = 255;

      color_select_draw_xy_marker (csp, NULL);
      color_select_update (csp, UPDATE_VALUES | UPDATE_CALLER);
      break;

    default:
      break;
    }

  return FALSE;
}

static gint
color_select_z_expose (GtkWidget      *widget,
		       GdkEventExpose *event,
		       ColorSelect    *csp)
{
  if (!csp->gc)
    csp->gc = gdk_gc_new (widget->window);

  color_select_draw_z_marker (csp, &event->area);

  return FALSE;
}

static gint
color_select_z_events (GtkWidget   *widget,
		       GdkEvent    *event,
		       ColorSelect *csp)
{
  GdkEventButton *bevent;
  GdkEventMotion *mevent;
  gint            tx, ty;

  switch (event->type)
    {
    case GDK_BUTTON_PRESS:
      bevent = (GdkEventButton *) event;

      color_select_draw_z_marker (csp, NULL);

      csp->pos[2] = 255 - (bevent->y * 255) / (Z_DEF_HEIGHT - 1);

      csp->pos[2] = CLAMP (csp->pos[2], 0, 255);

      gdk_pointer_grab (csp->z_color->window, FALSE,
			GDK_POINTER_MOTION_HINT_MASK |
			GDK_BUTTON1_MOTION_MASK |
			GDK_BUTTON_RELEASE_MASK,
			NULL, NULL, bevent->time);
      color_select_draw_z_marker (csp, NULL);
      color_select_update (csp, UPDATE_VALUES | UPDATE_CALLER);
      break;

    case GDK_BUTTON_RELEASE:
      bevent = (GdkEventButton *) event;

      color_select_draw_z_marker (csp, NULL);

      csp->pos[2] = 255 - (bevent->y * 255) / (Z_DEF_HEIGHT - 1);

      csp->pos[2] = CLAMP (csp->pos[2], 0, 255);

      gdk_pointer_ungrab (bevent->time);
      color_select_draw_z_marker (csp, NULL);
      color_select_update (csp, UPDATE_VALUES | UPDATE_XY_COLOR | UPDATE_CALLER);
      break;

    case GDK_MOTION_NOTIFY:
      mevent = (GdkEventMotion *) event;
      if (mevent->is_hint)
	{
	  gdk_window_get_pointer (widget->window, &tx, &ty, NULL);
	  mevent->x = tx;
	  mevent->y = ty;
	}

      color_select_draw_z_marker (csp, NULL);

      csp->pos[2] = 255 - (mevent->y * 255) / (Z_DEF_HEIGHT - 1);

      csp->pos[2] = CLAMP (csp->pos[2], 0, 255);

      color_select_draw_z_marker (csp, NULL);
      color_select_update (csp, UPDATE_VALUES | UPDATE_CALLER);
      break;

    default:
      break;
    }

  return FALSE;
}

static void
color_select_set_channel (ColorSelect                  *csp,
			  GimpColorSelectorChannelType  type)
{
  if (! csp)
    return;

  switch ((ColorSelectFillType) type)
    {
    case COLOR_SELECT_HUE:
      csp->z_color_fill = COLOR_SELECT_HUE;
      csp->xy_color_fill = COLOR_SELECT_SATURATION_VALUE;
      break;
    case COLOR_SELECT_SATURATION:
      csp->z_color_fill = COLOR_SELECT_SATURATION;
      csp->xy_color_fill = COLOR_SELECT_HUE_VALUE;
      break;
    case COLOR_SELECT_VALUE:
      csp->z_color_fill = COLOR_SELECT_VALUE;
      csp->xy_color_fill = COLOR_SELECT_HUE_SATURATION;
      break;
    case COLOR_SELECT_RED:
      csp->z_color_fill = COLOR_SELECT_RED;
      csp->xy_color_fill = COLOR_SELECT_GREEN_BLUE;
      break;
    case COLOR_SELECT_GREEN:
      csp->z_color_fill = COLOR_SELECT_GREEN;
      csp->xy_color_fill = COLOR_SELECT_RED_BLUE;
      break;
    case COLOR_SELECT_BLUE:
      csp->z_color_fill = COLOR_SELECT_BLUE;
      csp->xy_color_fill = COLOR_SELECT_RED_GREEN;
      break;
    default:
      break;
    }

  color_select_update (csp, UPDATE_POS);
  color_select_update (csp, UPDATE_Z_COLOR | UPDATE_XY_COLOR);
}

static void
color_select_image_fill (GtkWidget           *preview,
			 ColorSelectFillType  type,
			 const GimpHSV       *hsv,
			 const GimpRGB       *rgb)
{
  ColorSelectFill csf;
  gint            height;

  csf.buffer = g_malloc (preview->requisition.width * 3);

  csf.update = update_procs[type];

  csf.y      = -1;
  csf.width  = preview->requisition.width;
  csf.height = preview->requisition.height;
  csf.hsv    = *hsv;
  csf.rgb    = *rgb;

  height = csf.height;
  if (height > 0)
    while (height--)
      {
	if (csf.update)
	  (* csf.update) (&csf);

	gtk_preview_draw_row (GTK_PREVIEW (preview),
			      csf.buffer, 0, csf.y, csf.width);
      }

  g_free (csf.buffer);
}

static void
color_select_draw_z_marker (ColorSelect  *csp,
			    GdkRectangle *clip)
{
  gint width;
  gint height;
  gint y;
  gint minx;
  gint miny;

  if (!csp->gc)
    return;

  y = (Z_DEF_HEIGHT - 1) - ((Z_DEF_HEIGHT - 1) * csp->pos[2]) / 255;
  width  = csp->z_color->requisition.width;
  height = csp->z_color->requisition.height;
  minx = 0;
  miny = 0;
  if (width <= 0)
    return;

  if (clip)
    {
      width  = MIN(width,  clip->x + clip->width);
      height = MIN(height, clip->y + clip->height);
      minx   = MAX(0, clip->x);
      miny   = MAX(0, clip->y);
    }

  if (y >= miny && y < height)
    {
      gdk_gc_set_function (csp->gc, GDK_INVERT);
      gdk_draw_line (csp->z_color->window, csp->gc, minx, y, width - 1, y);
      gdk_gc_set_function (csp->gc, GDK_COPY);
    }
}

static void
color_select_draw_xy_marker (ColorSelect  *csp,
			     GdkRectangle *clip)
{
  gint width;
  gint height;
  gint x, y;
  gint minx, miny;

  if (!csp->gc)
    return;

  x = ((XY_DEF_WIDTH - 1) * csp->pos[0]) / 255;
  y = (XY_DEF_HEIGHT - 1) - ((XY_DEF_HEIGHT - 1) * csp->pos[1]) / 255;
  width = csp->xy_color->requisition.width;
  height = csp->xy_color->requisition.height;
  minx = 0;
  miny = 0;
  if ((width <= 0) || (height <= 0))
    return;

  gdk_gc_set_function (csp->gc, GDK_INVERT);

  if (clip)
    {
      width  = MIN(width,  clip->x + clip->width);
      height = MIN(height, clip->y + clip->height);
      minx   = MAX(0, clip->x);
      miny   = MAX(0, clip->y);
    }

  if (y >= miny && y < height)
    gdk_draw_line (csp->xy_color->window, csp->gc, minx, y, width - 1, y);

  if (x >= minx && x < width)
    gdk_draw_line (csp->xy_color->window, csp->gc, x, miny, x, height - 1);

  gdk_gc_set_function (csp->gc, GDK_COPY);
}

static void
color_select_update_red (ColorSelectFill *csf)
{
  guchar *p;
  gint    i, r;

  p = csf->buffer;

  csf->y += 1;
  r = (csf->height - csf->y + 1) * 255 / csf->height;

  if (r < 0)
    r = 0;
  if (r > 255)
    r = 255;

  for (i = 0; i < csf->width; i++)
    {
      *p++ = r;
      *p++ = 0;
      *p++ = 0;
    }
}

static void
color_select_update_green (ColorSelectFill *csf)
{
  guchar *p;
  gint    i, g;

  p = csf->buffer;

  csf->y += 1;
  g = (csf->height - csf->y + 1) * 255 / csf->height;

  if (g < 0)
    g = 0;
  if (g > 255)
    g = 255;

  for (i = 0; i < csf->width; i++)
    {
      *p++ = 0;
      *p++ = g;
      *p++ = 0;
    }
}

static void
color_select_update_blue (ColorSelectFill *csf)
{
  guchar *p;
  gint    i, b;

  p = csf->buffer;

  csf->y += 1;
  b = (csf->height - csf->y + 1) * 255 / csf->height;

  if (b < 0)
    b = 0;
  if (b > 255)
    b = 255;

  for (i = 0; i < csf->width; i++)
    {
      *p++ = 0;
      *p++ = 0;
      *p++ = b;
    }
}

static void
color_select_update_hue (ColorSelectFill *csf)
{
  guchar *p;
  gfloat  h, f;
  gint    r, g, b;
  gint    i;

  p = csf->buffer;

  csf->y += 1;
  h = csf->y * 360.0 / csf->height;

  h = CLAMP (360 - h, 0, 360);

  h /= 60;
  f = (h - (int) h) * 255;

  r = g = b = 0;

  switch ((int) h)
    {
    case 0:
      r = 255;
      g = f;
      b = 0;
      break;
    case 1:
      r = 255 - f;
      g = 255;
      b = 0;
      break;
    case 2:
      r = 0;
      g = 255;
      b = f;
      break;
    case 3:
      r = 0;
      g = 255 - f;
      b = 255;
      break;
    case 4:
      r = f;
      g = 0;
      b = 255;
      break;
    case 5:
      r = 255;
      g = 0;
      b = 255 - f;
      break;
    }

  for (i = 0; i < csf->width; i++)
    {
      *p++ = r;
      *p++ = g;
      *p++ = b;
    }
}

static void
color_select_update_saturation (ColorSelectFill *csf)
{
  guchar *p;
  gint    s;
  gint    i;

  p = csf->buffer;

  csf->y += 1;
  s = csf->y * 255 / csf->height;

  if (s < 0)
    s = 0;
  if (s > 255)
    s = 255;

  s = 255 - s;

  for (i = 0; i < csf->width; i++)
    {
      *p++ = s;
      *p++ = s;
      *p++ = s;
    }
}

static void
color_select_update_value (ColorSelectFill *csf)
{
  guchar *p;
  gint    v;
  gint    i;

  p = csf->buffer;

  csf->y += 1;
  v = csf->y * 255 / csf->height;

  if (v < 0)
    v = 0;
  if (v > 255)
    v = 255;

  v = 255 - v;

  for (i = 0; i < csf->width; i++)
    {
      *p++ = v;
      *p++ = v;
      *p++ = v;
    }
}

static void
color_select_update_red_green (ColorSelectFill *csf)
{
  guchar *p;
  gint    i, r, b;
  gfloat  g, dg;

  p = csf->buffer;

  csf->y += 1;
  b = (gint) (csf->rgb.b * 255.999);
  r = (csf->height - csf->y + 1) * 255 / csf->height;

  if (r < 0)
    r = 0;
  if (r > 255)
    r = 255;

  g = 0;
  dg = 255.0 / csf->width;

  for (i = 0; i < csf->width; i++)
    {
      *p++ = r;
      *p++ = g;
      *p++ = b;

      g += dg;
    }
}

static void
color_select_update_red_blue (ColorSelectFill *csf)
{
  guchar *p;
  gint    i, r, g;
  gfloat  b, db;

  p = csf->buffer;

  csf->y += 1;
  g = (gint) (csf->rgb.g * 255.999);
  r = (csf->height - csf->y + 1) * 255 / csf->height;

  if (r < 0)
    r = 0;
  if (r > 255)
    r = 255;

  b = 0;
  db = 255.0 / csf->width;

  for (i = 0; i < csf->width; i++)
    {
      *p++ = r;
      *p++ = g;
      *p++ = b;

      b += db;
    }
}

static void
color_select_update_green_blue (ColorSelectFill *csf)
{
  guchar *p;
  gint    i, g, r;
  gfloat  b, db;

  p = csf->buffer;

  csf->y += 1;
  r = (gint) (csf->rgb.r * 255.999);
  g = (csf->height - csf->y + 1) * 255 / csf->height;

  if (g < 0)
    g = 0;
  if (g > 255)
    g = 255;

  b = 0;
  db = 255.0 / csf->width;

  for (i = 0; i < csf->width; i++)
    {
      *p++ = r;
      *p++ = g;
      *p++ = b;

      b += db;
    }
}

static void
color_select_update_hue_saturation (ColorSelectFill *csf)
{
  guchar *p;
  gfloat  h, v, s, ds;
  gint    f;
  gint    i;

  p = csf->buffer;

  csf->y += 1;
  h = 360 - (csf->y * 360 / csf->height);

  if (h < 0)
    h = 0;
  if (h > 359)
    h = 359;

  h /= 60;
  f = (h - (int) h) * 255;

  s = 0;
  ds = 1.0 / csf->width;

  v = csf->hsv.v;

  switch ((int) h)
    {
    case 0:
      for (i = 0; i < csf->width; i++)
	{
	  *p++ = v * 255;
	  *p++ = v * (255 - (s * (255 - f)));
	  *p++ = v * 255 * (1 - s);

	  s += ds;
	}
      break;
    case 1:
      for (i = 0; i < csf->width; i++)
	{
	  *p++ = v * (255 - s * f);
	  *p++ = v * 255;
	  *p++ = v * 255 * (1 - s);

	  s += ds;
	}
      break;
    case 2:
      for (i = 0; i < csf->width; i++)
	{
	  *p++ = v * 255 * (1 - s);
	  *p++ = v *255;
	  *p++ = v * (255 - (s * (255 - f)));

	  s += ds;
	}
      break;
    case 3:
      for (i = 0; i < csf->width; i++)
	{
	  *p++ = v * 255 * (1 - s);
	  *p++ = v * (255 - s * f);
	  *p++ = v * 255;

	  s += ds;
	}
      break;
    case 4:
      for (i = 0; i < csf->width; i++)
	{
	  *p++ = v * (255 - (s * (255 - f)));
	  *p++ = v * (255 * (1 - s));
	  *p++ = v * 255;

	  s += ds;
	}
      break;
    case 5:
      for (i = 0; i < csf->width; i++)
	{
	  *p++ = v * 255;
	  *p++ = v * 255 * (1 - s);
	  *p++ = v * (255 - s * f);

	  s += ds;
	}
      break;
    }
}

static void
color_select_update_hue_value (ColorSelectFill *csf)
{
  guchar *p;
  gfloat  h, v, dv, s;
  gint    f;
  gint    i;

  p = csf->buffer;

  csf->y += 1;
  h = 360 - (csf->y * 360 / csf->height);

  if (h < 0)
    h = 0;
  if (h > 359)
    h = 359;

  h /= 60;
  f = (h - (int) h) * 255;

  v = 0;
  dv = 1.0 / csf->width;

  s = csf->hsv.s;

  switch ((int) h)
    {
    case 0:
      for (i = 0; i < csf->width; i++)
	{
	  *p++ = v * 255;
	  *p++ = v * (255 - (s * (255 - f)));
	  *p++ = v * 255 * (1 - s);

	  v += dv;
	}
      break;
    case 1:
      for (i = 0; i < csf->width; i++)
	{
	  *p++ = v * (255 - s * f);
	  *p++ = v * 255;
	  *p++ = v * 255 * (1 - s);

	  v += dv;
	}
      break;
    case 2:
      for (i = 0; i < csf->width; i++)
	{
	  *p++ = v * 255 * (1 - s);
	  *p++ = v *255;
	  *p++ = v * (255 - (s * (255 - f)));

	  v += dv;
	}
      break;
    case 3:
      for (i = 0; i < csf->width; i++)
	{
	  *p++ = v * 255 * (1 - s);
	  *p++ = v * (255 - s * f);
	  *p++ = v * 255;

	  v += dv;
	}
      break;
    case 4:
      for (i = 0; i < csf->width; i++)
	{
	  *p++ = v * (255 - (s * (255 - f)));
	  *p++ = v * (255 * (1 - s));
	  *p++ = v * 255;

	  v += dv;
	}
      break;
    case 5:
      for (i = 0; i < csf->width; i++)
	{
	  *p++ = v * 255;
	  *p++ = v * 255 * (1 - s);
	  *p++ = v * (255 - s * f);

	  v += dv;
	}
      break;
    }
}

static void
color_select_update_saturation_value (ColorSelectFill *csf)
{
  guchar *p;
  gfloat  h, v, dv, s;
  gint    f;
  gint    i;

  p = csf->buffer;

  csf->y += 1;
  s = (gfloat) csf->y / csf->height;

  if (s < 0)
    s = 0;
  if (s > 1)
    s = 1;

  s = 1 - s;

  h = (gfloat) csf->hsv.h * 360.0;
  if (h >= 360)
    h -= 360;
  h /= 60;
  f = (h - (gint) h) * 255;

  v = 0;
  dv = 1.0 / csf->width;

  switch ((gint) h)
    {
    case 0:
      for (i = 0; i < csf->width; i++)
	{
	  *p++ = v * 255;
	  *p++ = v * (255 - (s * (255 - f)));
	  *p++ = v * 255 * (1 - s);

	  v += dv;
	}
      break;
    case 1:
      for (i = 0; i < csf->width; i++)
	{
	  *p++ = v * (255 - s * f);
	  *p++ = v * 255;
	  *p++ = v * 255 * (1 - s);

	  v += dv;
	}
      break;
    case 2:
      for (i = 0; i < csf->width; i++)
	{
	  *p++ = v * 255 * (1 - s);
	  *p++ = v *255;
	  *p++ = v * (255 - (s * (255 - f)));

	  v += dv;
	}
      break;
    case 3:
      for (i = 0; i < csf->width; i++)
	{
	  *p++ = v * 255 * (1 - s);
	  *p++ = v * (255 - s * f);
	  *p++ = v * 255;

	  v += dv;
	}
      break;
    case 4:
      for (i = 0; i < csf->width; i++)
	{
	  *p++ = v * (255 - (s * (255 - f)));
	  *p++ = v * (255 * (1 - s));
	  *p++ = v * 255;

	  v += dv;
	}
      break;
    case 5:
      for (i = 0; i < csf->width; i++)
	{
	  *p++ = v * 255;
	  *p++ = v * 255 * (1 - s);
	  *p++ = v * (255 - s * f);

	  v += dv;
	}
      break;
    }
}


/****************************/
/* Color notebook glue      */

typedef struct
{
  GimpColorSelectorCallback  callback;
  gpointer                  *client_data;
  ColorSelect               *csp;
  GtkWidget                 *main_vbox;
} notebook_glue;

static GtkWidget *
color_select_notebook_new (const GimpHSV             *hsv,
			   const GimpRGB             *rgb,
			   gboolean                   show_alpha,
			   GimpColorSelectorCallback  callback,
			   gpointer                   data,
			   /* RETURNS: */
			   gpointer                  *selector_data)
{
  ColorSelect   *csp;
  notebook_glue *glue;

  glue = g_new (notebook_glue, 1);

  csp = g_new (ColorSelect, 1);

  glue->csp         = csp;
  glue->callback    = callback;
  glue->client_data = data;

  csp->callback      = color_select_notebook_update_callback;
  csp->client_data   = glue;
  csp->z_color_fill  = COLOR_SELECT_HUE;
  csp->xy_color_fill = COLOR_SELECT_SATURATION_VALUE;
  csp->gc            = NULL;

  csp->hsv           = *hsv;
  csp->rgb           = *rgb;

  color_select_update_pos (csp);

  glue->main_vbox = color_select_widget_new (csp, rgb);

  color_select_update (csp, UPDATE_XY_COLOR | UPDATE_Z_COLOR);

  *selector_data = glue;

  return glue->main_vbox;
}

static void
color_select_notebook_free (gpointer data)
{
  notebook_glue *glue = data;

  gdk_gc_destroy (glue->csp->gc);
  g_free (glue->csp);

  /* don't need to destroy the widget, since it's done by the caller
   * of this function
   */

  g_free (glue);
}

static void
color_select_notebook_set_color (gpointer       data,
				 const GimpHSV *hsv,
				 const GimpRGB *rgb)
{
  notebook_glue *glue = data;

  color_select_set_color (glue->csp, hsv, rgb);
}

static void
color_select_notebook_set_channel (gpointer                      data,
				   GimpColorSelectorChannelType  channel)
{
  notebook_glue *glue = data;

  color_select_set_channel (glue->csp, channel);
}

static void
color_select_notebook_update_callback (const GimpHSV *hsv,
				       const GimpRGB *rgb,
				       gpointer       data)
{
  notebook_glue *glue = data;

  glue->callback (glue->client_data, hsv, rgb);
}