gimpcurvestool.c 33.9 KB
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/* 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
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 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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 */
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "appenv.h"
#include "actionarea.h"
#include "buildmenu.h"
#include "colormaps.h"
#include "cursorutil.h"
#include "drawable.h"
#include "general.h"
#include "gdisplay.h"
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#include "gimphistogram.h"
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#include "interface.h"
#include "curves.h"
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#include "gimplut.h"
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#include "libgimp/gimpintl.h"

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#define ROUND(x)  ((int) ((x) + 0.5))

#define GRAPH              0x1
#define XRANGE_TOP         0x2
#define XRANGE_BOTTOM      0x4
#define YRANGE             0x8
#define DRAW               0x10
#define ALL                0xFF

#define GRAPH_WIDTH      256
#define GRAPH_HEIGHT     256
#define XRANGE_WIDTH     256
#define XRANGE_HEIGHT    16
#define YRANGE_WIDTH     16
#define YRANGE_HEIGHT    256
#define RADIUS           3
#define MIN_DISTANCE     8

#define RANGE_MASK  GDK_EXPOSURE_MASK | \
                    GDK_ENTER_NOTIFY_MASK

#define GRAPH_MASK  GDK_EXPOSURE_MASK | \
		    GDK_POINTER_MOTION_MASK | \
		    GDK_POINTER_MOTION_HINT_MASK | \
                    GDK_ENTER_NOTIFY_MASK | \
		    GDK_BUTTON_PRESS_MASK | \
		    GDK_BUTTON_RELEASE_MASK | \
		    GDK_BUTTON1_MOTION_MASK

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/*  the curves structures  */
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typedef struct _Curves Curves;
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struct _Curves
{
  int x, y;    /*  coords for last mouse click  */
};

typedef double CRMatrix[4][4];

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/*  the curves tool options  */
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static ToolOptions  * curves_options = NULL;
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/*  the curves dialog  */
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static CurvesDialog * curves_dialog = NULL;
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static CRMatrix CR_basis =
{
  { -0.5,  1.5, -1.5,  0.5 },
  {  1.0, -2.5,  2.0, -0.5 },
  { -0.5,  0.0,  0.5,  0.0 },
  {  0.0,  1.0,  0.0,  0.0 },
};

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/*  curves action functions  */
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static void   curves_button_press   (Tool *, GdkEventButton *, gpointer);
static void   curves_button_release (Tool *, GdkEventButton *, gpointer);
static void   curves_motion         (Tool *, GdkEventMotion *, gpointer);
static void   curves_cursor_update  (Tool *, GdkEventMotion *, gpointer);
static void   curves_control        (Tool *, int, gpointer);

static CurvesDialog *  curves_new_dialog              (void);
static void            curves_update                  (CurvesDialog *, int);
static void            curves_plot_curve              (CurvesDialog *, int, int, int, int);
static void            curves_preview                 (CurvesDialog *);
static void            curves_value_callback          (GtkWidget *, gpointer);
static void            curves_red_callback            (GtkWidget *, gpointer);
static void            curves_green_callback          (GtkWidget *, gpointer);
static void            curves_blue_callback           (GtkWidget *, gpointer);
static void            curves_alpha_callback           (GtkWidget *, gpointer);
static void            curves_smooth_callback         (GtkWidget *, gpointer);
static void            curves_free_callback           (GtkWidget *, gpointer);
static void            curves_reset_callback          (GtkWidget *, gpointer);
static void            curves_ok_callback             (GtkWidget *, gpointer);
static void            curves_cancel_callback         (GtkWidget *, gpointer);
static gint            curves_delete_callback         (GtkWidget *, GdkEvent *, gpointer);
static void            curves_preview_update          (GtkWidget *, gpointer);
static gint            curves_xrange_events           (GtkWidget *, GdkEvent *, CurvesDialog *);
static gint            curves_yrange_events           (GtkWidget *, GdkEvent *, CurvesDialog *);
static gint            curves_graph_events            (GtkWidget *, GdkEvent *, CurvesDialog *);
static void            curves_CR_compose              (CRMatrix, CRMatrix, CRMatrix);

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/*  curves machinery  */

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float
curves_lut_func (CurvesDialog *cd,
		 int nchannels, int channel, float value)
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{
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  float f;
  int index;
  double inten;
  int j;
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  if (nchannels == 1)
    j = 0;
  else
    j = channel + 1;
  inten = value;
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  /* For color images this runs through the loop with j = channel +1
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     the first time and j = 0 the second time */
  /* For bw images this runs through the loop with j = 0 the first and
     only time  */
  for (; j >= 0; j -= (channel + 1))
  {
    /* don't apply the overall curve to the alpha channel */
    if (j == 0 && (nchannels == 2 || nchannels == 4)
	&& channel == nchannels -1)
      return inten;

    if (inten < 0.0)
      inten = cd->curve[j][0]/255.0;
    else if (inten >= 1.0)
      inten = cd->curve[j][255]/255.0;
    else /* interpolate the curve */
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    {
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      index = floor(inten * 255.0);
      f = inten*255.0 - index;
      inten = ((1.0 - f) * cd->curve[j][index    ] + 
	       (      f) * cd->curve[j][index + 1] ) / 255.0;
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    }
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  }
  return inten;
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}

/*  curves action functions  */

static void
curves_button_press (Tool           *tool,
		     GdkEventButton *bevent,
		     gpointer        gdisp_ptr)
{
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  GDisplay *gdisp;
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  GimpDrawable * drawable;
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  gdisp = gdisp_ptr;
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  drawable = gimage_active_drawable (gdisp->gimage);

  if(drawable != tool->drawable)
    {
      active_tool->preserve = TRUE;
      image_map_abort (curves_dialog->image_map);
      active_tool->preserve = FALSE;
      curves_dialog->drawable = tool->drawable = drawable;
      curves_dialog->color = drawable_color (drawable);
      curves_dialog->image_map = image_map_create (gdisp, drawable);
    }

  if(tool)
    tool->state = ACTIVE;

}

static void
curves_colour_update(Tool           *tool,
		     GDisplay       *gdisp,
		     GimpDrawable   *drawable,
		     gint           x,
		     gint           y)
{
  unsigned char *color;
  int offx, offy;
  int has_alpha;
  int is_indexed;
  int sample_type;
  int maxval;

  if(!tool || tool->state != ACTIVE)
    return;

  drawable_offsets (drawable, &offx, &offy);

  x -= offx;
  y -= offy;

  if (!(color = image_map_get_color_at(curves_dialog->image_map, x, y)))
    return;

  sample_type = gimp_drawable_type(drawable);
  is_indexed = gimp_drawable_indexed (drawable);
  has_alpha = TYPE_HAS_ALPHA(sample_type);

  curves_dialog->col_value[HISTOGRAM_RED] = color[RED_PIX];
  curves_dialog->col_value[HISTOGRAM_GREEN] = color[GREEN_PIX];
  curves_dialog->col_value[HISTOGRAM_BLUE] = color[BLUE_PIX];

  if (has_alpha)
    {
      curves_dialog->col_value [HISTOGRAM_ALPHA] = color[3];
    }

  if (is_indexed)
    curves_dialog->col_value [HISTOGRAM_ALPHA] = color[4];

  maxval = MAXIMUM(color[RED_PIX],color[GREEN_PIX]);
  curves_dialog->col_value[HISTOGRAM_VALUE] = MAXIMUM(maxval,color[BLUE_PIX]);

  g_free(color);

  curves_update (curves_dialog, GRAPH | DRAW);
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}

static void
curves_button_release (Tool           *tool,
		       GdkEventButton *bevent,
		       gpointer        gdisp_ptr)
{
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  gint x, y;
  GimpDrawable * drawable;
  GDisplay *gdisp;

  gdisp = (GDisplay *) gdisp_ptr;

  if(!curves_dialog || 
     !gdisp || 
     !(drawable = gimage_active_drawable (gdisp->gimage)))
     return;

  gdisplay_untransform_coords (gdisp, bevent->x, bevent->y, &x, &y, FALSE, FALSE);
  curves_colour_update(tool,gdisp,drawable,x,y);
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}

static void
curves_motion (Tool           *tool,
	       GdkEventMotion *mevent,
	       gpointer        gdisp_ptr)
{
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  GDisplay *gdisp;
  gint x, y;
  GimpDrawable * drawable;

  gdisp = (GDisplay *) gdisp_ptr;

  if(!curves_dialog || 
     !gdisp || 
     !(drawable = gimage_active_drawable (gdisp->gimage)))
     return;

  gdisplay_untransform_coords (gdisp, mevent->x, mevent->y, &x, &y, FALSE, FALSE);
  curves_colour_update(tool,gdisp,drawable,x,y);
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}

static void
curves_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
curves_control (Tool     *tool,
		int       action,
		gpointer  gdisp_ptr)
{
  Curves * _curves;

  _curves = (Curves *) tool->private;

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

Tool *
tools_new_curves ()
{
  Tool * tool;
  Curves * private;

  /*  The tool options  */
  if (!curves_options)
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    {
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      curves_options = tool_options_new (_("Curves Options"));
      tools_register (CURVES, curves_options);
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    }
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  tool = (Tool *) g_malloc (sizeof (Tool));
  private = (Curves *) g_malloc (sizeof (Curves));

  tool->type = CURVES;
  tool->state = INACTIVE;
  tool->scroll_lock = 1;  /*  Disallow scrolling  */
  tool->auto_snap_to = TRUE;
  tool->private = (void *) private;
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  tool->button_press_func = curves_button_press;
  tool->button_release_func = curves_button_release;
  tool->motion_func = curves_motion;
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  tool->arrow_keys_func = standard_arrow_keys_func;  tool->modifier_key_func = standard_modifier_key_func;
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  tool->cursor_update_func = curves_cursor_update;
  tool->control_func = curves_control;
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  tool->preserve = TRUE;
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  tool->gdisp_ptr = NULL;
  tool->drawable = NULL;
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  return tool;
}

void
tools_free_curves (Tool *tool)
{
  Curves * _curves;

  _curves = (Curves *) tool->private;

  /*  Close the color select dialog  */
  if (curves_dialog)
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    curves_cancel_callback (NULL, (gpointer) curves_dialog);
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  g_free (_curves);
}

/*  the action area structure  */
static ActionAreaItem action_items[] =
{
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  { N_("Reset"), curves_reset_callback, NULL, NULL },
  { N_("OK"), curves_ok_callback, NULL, NULL },
  { N_("Cancel"), curves_cancel_callback, NULL, NULL }
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};

static MenuItem channel_items[] =
{
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  { N_("Value"), 0, 0, curves_value_callback, NULL, NULL, NULL },
  { N_("Red"), 0, 0, curves_red_callback, NULL, NULL, NULL },
  { N_("Green"), 0, 0, curves_green_callback, NULL, NULL, NULL },
  { N_("Blue"), 0, 0, curves_blue_callback, NULL, NULL, NULL },
  { N_("Alpha"), 0, 0, curves_alpha_callback, NULL, NULL, NULL },
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  { NULL, 0, 0, NULL, NULL, NULL, NULL }
};

static MenuItem curve_type_items[] =
{
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  { N_("Smooth"), 0, 0, curves_smooth_callback, NULL, NULL, NULL },
  { N_("Free"), 0, 0, curves_free_callback, NULL, NULL, NULL },
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  { NULL, 0, 0, NULL, NULL, NULL, NULL }
};

void
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curves_initialize (GDisplay *gdisp)
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{
  int i, j;

  if (drawable_indexed (gimage_active_drawable (gdisp->gimage)))
    {
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      g_message (_("Curves for indexed drawables cannot be adjusted."));
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      return;
    }

  /*  The curves dialog  */
  if (!curves_dialog)
    curves_dialog = curves_new_dialog ();

  /*  Initialize the values  */
  curves_dialog->channel = HISTOGRAM_VALUE;
  for (i = 0; i < 5; i++)
    for (j = 0; j < 256; j++)
      curves_dialog->curve[i][j] = j;

  curves_dialog->grab_point = -1;
  for (i = 0; i < 5; i++)
    {
      for (j = 0; j < 17; j++)
	{
	  curves_dialog->points[i][j][0] = -1;
	  curves_dialog->points[i][j][1] = -1;
	}
      curves_dialog->points[i][0][0] = 0;
      curves_dialog->points[i][0][1] = 0;
      curves_dialog->points[i][16][0] = 255;
      curves_dialog->points[i][16][1] = 255;
    }

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  curves_dialog->drawable = gimage_active_drawable (gdisp->gimage);
  curves_dialog->color = drawable_color ( (curves_dialog->drawable));
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  curves_dialog->image_map = image_map_create (gdisp, curves_dialog->drawable);
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  /* check for alpha channel */
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  if (drawable_has_alpha ( (curves_dialog->drawable)))
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    gtk_widget_set_sensitive( channel_items[4].widget, TRUE);
  else 
    gtk_widget_set_sensitive( channel_items[4].widget, FALSE);
  
  /*  hide or show the channel menu based on image type  */
  if (curves_dialog->color)
    for (i = 0; i < 4; i++) 
       gtk_widget_set_sensitive( channel_items[i].widget, TRUE);
  else 
    for (i = 1; i < 4; i++) 
       gtk_widget_set_sensitive( channel_items[i].widget, FALSE);

  /* set the current selection */
  gtk_option_menu_set_history ( GTK_OPTION_MENU (curves_dialog->channel_menu), 0);

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  if (!GTK_WIDGET_VISIBLE (curves_dialog->shell))
    gtk_widget_show (curves_dialog->shell);
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  curves_update (curves_dialog, GRAPH | DRAW);
}

void
curves_free ()
{
  if (curves_dialog)
    {
      if (curves_dialog->image_map)
	{
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	  active_tool->preserve = TRUE;
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	  image_map_abort (curves_dialog->image_map);
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	  active_tool->preserve = FALSE;
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	  curves_dialog->image_map = NULL;
	}
      if (curves_dialog->pixmap)
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	gdk_pixmap_unref (curves_dialog->pixmap);
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      gtk_widget_destroy (curves_dialog->shell);
    }
}

/**************************/
/*  Select Curves dialog  */
/**************************/

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static CurvesDialog *
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curves_new_dialog ()
{
  CurvesDialog *cd;
  GtkWidget *vbox;
  GtkWidget *hbox;
  GtkWidget *label;
  GtkWidget *frame;
  GtkWidget *toggle;
  GtkWidget *option_menu;
  GtkWidget *channel_hbox;
  GtkWidget *menu;
  GtkWidget *table;
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  int i, j;
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  cd = g_malloc (sizeof (CurvesDialog));
  cd->preview = TRUE;
  cd->curve_type = SMOOTH;
  cd->pixmap = NULL;
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  cd->channel = HISTOGRAM_VALUE;
  for (i = 0; i < 5; i++)
    for (j = 0; j < 256; j++)
      cd->curve[i][j] = j;
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  for(i = 0; i < (sizeof(cd->col_value)/sizeof(cd->col_value[0])); i++)
    cd->col_value[i] = 0;

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  cd->lut = gimp_lut_new();
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  for (i = 0; i < 5; i++)
    channel_items [i].user_data = (gpointer) cd;
  for (i = 0; i < 2; i++)
    curve_type_items [i].user_data = (gpointer) cd;

  /*  The shell and main vbox  */
  cd->shell = gtk_dialog_new ();
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  gtk_window_set_wmclass (GTK_WINDOW (cd->shell), "curves", "Gimp");
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  gtk_window_set_title (GTK_WINDOW (cd->shell), _("Curves"));
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  gtk_signal_connect (GTK_OBJECT (cd->shell), "delete_event",
		      GTK_SIGNAL_FUNC (curves_delete_callback),
		      cd);
  
  vbox = gtk_vbox_new (FALSE, 2);
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  gtk_container_set_border_width (GTK_CONTAINER (vbox), 2);
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  gtk_box_pack_start (GTK_BOX (GTK_DIALOG (cd->shell)->vbox), vbox, TRUE, TRUE, 0);

  /*  The option menu for selecting channels  */
  channel_hbox = gtk_hbox_new (FALSE, 2);
  gtk_box_pack_start (GTK_BOX (vbox), channel_hbox, FALSE, FALSE, 0);

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  label = gtk_label_new (_("Modify Curves for Channel: "));
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  gtk_box_pack_start (GTK_BOX (channel_hbox), label, FALSE, FALSE, 0);

  menu = build_menu (channel_items, NULL);
  cd->channel_menu = gtk_option_menu_new ();
  gtk_box_pack_start (GTK_BOX (channel_hbox), cd->channel_menu, FALSE, FALSE, 2);

  gtk_widget_show (label);
  gtk_widget_show (cd->channel_menu);
  gtk_widget_show (channel_hbox);
  gtk_option_menu_set_menu (GTK_OPTION_MENU (cd->channel_menu), menu);

  /*  The table for the yrange and the graph  */
  table = gtk_table_new (2, 2, FALSE);
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  gtk_container_set_border_width (GTK_CONTAINER (table), 2);
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  gtk_box_pack_start (GTK_BOX (vbox), table, FALSE, FALSE, 0);

  /*  The range drawing area  */
  frame = gtk_frame_new (NULL);
  gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
  gtk_table_attach (GTK_TABLE (table), frame, 0, 1, 0, 1,
		    GTK_EXPAND, GTK_EXPAND, 0, 0);

  cd->yrange = gtk_preview_new (GTK_PREVIEW_GRAYSCALE);
  gtk_preview_size (GTK_PREVIEW (cd->yrange), YRANGE_WIDTH, YRANGE_HEIGHT);
  gtk_widget_set_events (cd->yrange, RANGE_MASK);
  gtk_signal_connect (GTK_OBJECT (cd->yrange), "event",
		      (GtkSignalFunc) curves_yrange_events,
		      cd);
  gtk_container_add (GTK_CONTAINER (frame), cd->yrange);
  gtk_widget_show (cd->yrange);
  gtk_widget_show (frame);

  /*  The curves graph  */
  frame = gtk_frame_new (NULL);
  gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
  gtk_table_attach (GTK_TABLE (table), frame, 1, 2, 0, 1,
		    GTK_EXPAND | GTK_SHRINK | GTK_FILL,
		    GTK_FILL, 0, 0);

  cd->graph = gtk_drawing_area_new ();
  gtk_drawing_area_size (GTK_DRAWING_AREA (cd->graph),
			 GRAPH_WIDTH + RADIUS * 2,
			 GRAPH_HEIGHT + RADIUS * 2);
  gtk_widget_set_events (cd->graph, GRAPH_MASK);
  gtk_signal_connect (GTK_OBJECT (cd->graph), "event",
		      (GtkSignalFunc) curves_graph_events,
		      cd);
  gtk_container_add (GTK_CONTAINER (frame), cd->graph);
  gtk_widget_show (cd->graph);
  gtk_widget_show (frame);

  /*  The range drawing area  */
  frame = gtk_frame_new (NULL);
  gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
  gtk_table_attach (GTK_TABLE (table), frame, 1, 2, 1, 2,
		    GTK_EXPAND, GTK_EXPAND, 0, 0);

  cd->xrange = gtk_preview_new (GTK_PREVIEW_GRAYSCALE);
  gtk_preview_size (GTK_PREVIEW (cd->xrange), XRANGE_WIDTH, XRANGE_HEIGHT);
  gtk_widget_set_events (cd->xrange, RANGE_MASK);
  gtk_signal_connect (GTK_OBJECT (cd->xrange), "event",
		      (GtkSignalFunc) curves_xrange_events,
		      cd);
  gtk_container_add (GTK_CONTAINER (frame), cd->xrange);
  gtk_widget_show (cd->xrange);
  gtk_widget_show (frame);
  gtk_widget_show (table);

  /*  Horizontal box for preview  */
  hbox = gtk_hbox_new (FALSE, 2);
  gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);

  /*  The option menu for selecting the drawing method  */
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  label = gtk_label_new (_("Curve Type: "));
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  gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);

  menu = build_menu (curve_type_items, NULL);
  option_menu = gtk_option_menu_new ();
  gtk_box_pack_start (GTK_BOX (hbox), option_menu, FALSE, FALSE, 2);

  gtk_widget_show (label);
  gtk_widget_show (option_menu);
  gtk_widget_show (hbox);
  gtk_option_menu_set_menu (GTK_OPTION_MENU (option_menu), menu);

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

  gtk_widget_show (label);
  gtk_widget_show (toggle);
  gtk_widget_show (hbox);

  /*  The action area  */
  action_items[0].user_data = cd;
  action_items[1].user_data = cd;
  action_items[2].user_data = cd;
  build_action_area (GTK_DIALOG (cd->shell), action_items, 3, 0);

  gtk_widget_show (vbox);

  return cd;
}

static void
curves_update (CurvesDialog *cd,
	       int           update)
{
  GdkRectangle area;
  int i, j;

  if (update & XRANGE_TOP)
    {
      for (i = 0; i < XRANGE_HEIGHT / 2; i++)
	gtk_preview_draw_row (GTK_PREVIEW (cd->xrange),
			      cd->curve[cd->channel],
			      0, i, XRANGE_WIDTH);

      if (update & DRAW)
	{
	  area.x = 0;
	  area.y = 0;
	  area.width = XRANGE_WIDTH;
	  area.height = XRANGE_HEIGHT / 2;
	  gtk_widget_draw (cd->xrange, &area);
	}
    }
  if (update & XRANGE_BOTTOM)
    {
      unsigned char buf[XRANGE_WIDTH];

      for (i = 0; i < XRANGE_WIDTH; i++)
	buf[i] = i;

      for (i = XRANGE_HEIGHT / 2; i < XRANGE_HEIGHT; i++)
	gtk_preview_draw_row (GTK_PREVIEW (cd->xrange), buf, 0, i, XRANGE_WIDTH);

      if (update & DRAW)
	{
	  area.x = 0;
	  area.y = XRANGE_HEIGHT / 2;
	  area.width = XRANGE_WIDTH;
	  area.height = XRANGE_HEIGHT / 2;
	  gtk_widget_draw (cd->xrange, &area);
	}
    }
  if (update & YRANGE)
    {
      unsigned char buf[YRANGE_WIDTH];

      for (i = 0; i < YRANGE_HEIGHT; i++)
	{
	  for (j = 0; j < YRANGE_WIDTH; j++)
	    buf[j] = (255 - i);

	  gtk_preview_draw_row (GTK_PREVIEW (cd->yrange), buf, 0, i, YRANGE_WIDTH);

	}

      if (update & DRAW)
	gtk_widget_draw (cd->yrange, NULL);
    }
  if ((update & GRAPH) && (update & DRAW) && cd->pixmap != NULL)
    {
      GdkPoint points[256];

      /*  Clear the pixmap  */
      gdk_draw_rectangle (cd->pixmap, cd->graph->style->bg_gc[GTK_STATE_NORMAL],
			  TRUE, 0, 0, GRAPH_WIDTH + RADIUS * 2, GRAPH_HEIGHT + RADIUS * 2);

      /*  Draw the grid lines  */
      for (i = 0; i < 5; i++)
	{
	  gdk_draw_line (cd->pixmap, cd->graph->style->dark_gc[GTK_STATE_NORMAL],
			 RADIUS, i * (GRAPH_HEIGHT / 4) + RADIUS,
			 GRAPH_WIDTH + RADIUS, i * (GRAPH_HEIGHT / 4) + RADIUS);
	  gdk_draw_line (cd->pixmap, cd->graph->style->dark_gc[GTK_STATE_NORMAL],
			 i * (GRAPH_WIDTH / 4) + RADIUS, RADIUS,
			 i * (GRAPH_WIDTH / 4) + RADIUS, GRAPH_HEIGHT + RADIUS);
	}

      /*  Draw the curve  */
      for (i = 0; i < 256; i++)
	{
	  points[i].x = i + RADIUS;
	  points[i].y = 255 - cd->curve[cd->channel][i] + RADIUS;
	}
      gdk_draw_points (cd->pixmap, cd->graph->style->black_gc, points, 256);

      /*  Draw the points  */
      if (cd->curve_type == SMOOTH)
	for (i = 0; i < 17; i++)
	  {
	    if (cd->points[cd->channel][i][0] != -1)
	      gdk_draw_arc (cd->pixmap, cd->graph->style->black_gc, TRUE,
			    cd->points[cd->channel][i][0],
			    255 - cd->points[cd->channel][i][1],
			    RADIUS * 2, RADIUS * 2, 0, 23040);
	  }

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      /* draw the colour line */
      gdk_draw_line(cd->pixmap, cd->graph->style->black_gc,
		    cd->col_value[cd->channel],RADIUS,
		    cd->col_value[cd->channel],GRAPH_HEIGHT + RADIUS);

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      gdk_draw_pixmap (cd->graph->window, cd->graph->style->black_gc, cd->pixmap,
		       0, 0, 0, 0, GRAPH_WIDTH + RADIUS * 2, GRAPH_HEIGHT + RADIUS * 2);
    }
}

static void
curves_plot_curve (CurvesDialog *cd,
		   int           p1,
		   int           p2,
		   int           p3,
		   int           p4)
{
  CRMatrix geometry;
  CRMatrix tmp1, tmp2;
  CRMatrix deltas;
  double x, dx, dx2, dx3;
  double y, dy, dy2, dy3;
  double d, d2, d3;
  int lastx, lasty;
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  gint32 newx, newy;
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  int i;

  /* construct the geometry matrix from the segment */
  for (i = 0; i < 4; i++)
    {
      geometry[i][2] = 0;
      geometry[i][3] = 0;
    }

  for (i = 0; i < 2; i++)
    {
      geometry[0][i] = cd->points[cd->channel][p1][i];
      geometry[1][i] = cd->points[cd->channel][p2][i];
      geometry[2][i] = cd->points[cd->channel][p3][i];
      geometry[3][i] = cd->points[cd->channel][p4][i];
    }

  /* subdivide the curve 1000 times */
  /* n can be adjusted to give a finer or coarser curve */
  d = 1.0 / 1000;
  d2 = d * d;
  d3 = d * d * d;

  /* construct a temporary matrix for determining the forward differencing deltas */
  tmp2[0][0] = 0;     tmp2[0][1] = 0;     tmp2[0][2] = 0;    tmp2[0][3] = 1;
  tmp2[1][0] = d3;    tmp2[1][1] = d2;    tmp2[1][2] = d;    tmp2[1][3] = 0;
  tmp2[2][0] = 6*d3;  tmp2[2][1] = 2*d2;  tmp2[2][2] = 0;    tmp2[2][3] = 0;
  tmp2[3][0] = 6*d3;  tmp2[3][1] = 0;     tmp2[3][2] = 0;    tmp2[3][3] = 0;

  /* compose the basis and geometry matrices */
  curves_CR_compose (CR_basis, geometry, tmp1);

  /* compose the above results to get the deltas matrix */
  curves_CR_compose (tmp2, tmp1, deltas);

  /* extract the x deltas */
  x = deltas[0][0];
  dx = deltas[1][0];
  dx2 = deltas[2][0];
  dx3 = deltas[3][0];

  /* extract the y deltas */
  y = deltas[0][1];
  dy = deltas[1][1];
  dy2 = deltas[2][1];
  dy3 = deltas[3][1];

  lastx = BOUNDS (x, 0, 255);
  lasty = BOUNDS (y, 0, 255);

  cd->curve[cd->channel][lastx] = lasty;

  /* loop over the curve */
  for (i = 0; i < 1000; i++)
    {
      /* increment the x values */
      x += dx;
      dx += dx2;
      dx2 += dx3;

      /* increment the y values */
      y += dy;
      dy += dy2;
      dy2 += dy3;

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      newx = CLAMP0255 (ROUND (x));
      newy = CLAMP0255 (ROUND (y));
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      /* if this point is different than the last one...then draw it */
      if ((lastx != newx) || (lasty != newy))
	cd->curve[cd->channel][newx] = newy;

      lastx = newx;
      lasty = newy;
    }
}

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void
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curves_calculate_curve (CurvesDialog *cd)
{
  int i;
  int points[17];
  int num_pts;
  int p1, p2, p3, p4;

  switch (cd->curve_type)
    {
    case GFREE:
      break;
    case SMOOTH:
      /*  cycle through the curves  */
      num_pts = 0;
      for (i = 0; i < 17; i++)
	if (cd->points[cd->channel][i][0] != -1)
	  points[num_pts++] = i;

      /*  Initialize boundary curve points */
      if (num_pts != 0)
	{
	  for (i = 0; i < cd->points[cd->channel][points[0]][0]; i++)
	    cd->curve[cd->channel][i] = cd->points[cd->channel][points[0]][1];
	  for (i = cd->points[cd->channel][points[num_pts - 1]][0]; i < 256; i++)
	    cd->curve[cd->channel][i] = cd->points[cd->channel][points[num_pts - 1]][1];
	}

      for (i = 0; i < num_pts - 1; i++)
	{
	  p1 = (i == 0) ? points[i] : points[(i - 1)];
	  p2 = points[i];
	  p3 = points[(i + 1)];
	  p4 = (i == (num_pts - 2)) ? points[(num_pts - 1)] : points[(i + 2)];

	  curves_plot_curve (cd, p1, p2, p3, p4);
	}
      break;
    }
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  gimp_lut_setup(cd->lut, (GimpLutFunc) curves_lut_func,
		 (void *) cd, gimp_drawable_bytes(cd->drawable));

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}

static void
curves_preview (CurvesDialog *cd)
{
  if (!cd->image_map)
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    g_message (_("curves_preview(): No image map"));
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  active_tool->preserve = TRUE;  /* Going to dirty the display... */

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  image_map_apply (cd->image_map,  (ImageMapApplyFunc)gimp_lut_process_2,
		   (void *) cd->lut);
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  active_tool->preserve = FALSE;  /* All done */
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}

static void
curves_value_callback (GtkWidget *w,
		       gpointer   client_data)
{
  CurvesDialog *cd;

  cd = (CurvesDialog *) client_data;

  if (cd->channel != HISTOGRAM_VALUE)
    {
      cd->channel = HISTOGRAM_VALUE;
      curves_update (cd, GRAPH | DRAW);
    }
}

static void
curves_red_callback (GtkWidget *w,
		     gpointer   client_data)
{
  CurvesDialog *cd;

  cd = (CurvesDialog *) client_data;

  if (cd->channel != HISTOGRAM_RED)
    {
      cd->channel = HISTOGRAM_RED;
      curves_update (cd, GRAPH | DRAW);
    }
}

static void
curves_green_callback (GtkWidget *w,
		       gpointer   client_data)
{
  CurvesDialog *cd;

  cd = (CurvesDialog *) client_data;

  if (cd->channel != HISTOGRAM_GREEN)
    {
      cd->channel = HISTOGRAM_GREEN;
      curves_update (cd, GRAPH | DRAW);
    }
}

static void
curves_blue_callback (GtkWidget *w,
		      gpointer   client_data)
{
  CurvesDialog *cd;

  cd = (CurvesDialog *) client_data;

  if (cd->channel != HISTOGRAM_BLUE)
    {
      cd->channel = HISTOGRAM_BLUE;
      curves_update (cd, GRAPH | DRAW);
    }
}

static void
curves_alpha_callback (GtkWidget *w,
		      gpointer   client_data)
{
  CurvesDialog *cd;

  cd = (CurvesDialog *) client_data;

  if (cd->channel != HISTOGRAM_ALPHA)
    {
      cd->channel = HISTOGRAM_ALPHA;
      curves_update (cd, GRAPH | DRAW);
    }
}

static void
curves_smooth_callback (GtkWidget *w,
			gpointer   client_data)
{
  CurvesDialog *cd;
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  int i;
  gint32 index;
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  cd = (CurvesDialog *) client_data;

  if (cd->curve_type != SMOOTH)
    {
      cd->curve_type = SMOOTH;

      /*  pick representative points from the curve and make them control points  */
      for (i = 0; i <= 8; i++)
	{
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	  index = CLAMP0255 (i * 32);
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	  cd->points[cd->channel][i * 2][0] = index;
	  cd->points[cd->channel][i * 2][1] = cd->curve[cd->channel][index];
	}

      curves_calculate_curve (cd);
      curves_update (cd, GRAPH | DRAW);

      if (cd->preview)
	curves_preview (cd);
    }
}

static void
curves_free_callback (GtkWidget *w,
		      gpointer   client_data)
{
  CurvesDialog *cd;

  cd = (CurvesDialog *) client_data;

  if (cd->curve_type != GFREE)
    {
      cd->curve_type = GFREE;
      curves_update (cd, GRAPH | DRAW);
    }
}

static void
curves_reset_callback (GtkWidget *widget,
		       gpointer   client_data)
{
  CurvesDialog *cd;
  int i;

  cd = (CurvesDialog *) client_data;

  /*  Initialize the values  */
  for (i = 0; i < 256; i++)
    cd->curve[cd->channel][i] = i;

  cd->grab_point = -1;
  for (i = 0; i < 17; i++)
    {
      cd->points[cd->channel][i][0] = -1;
      cd->points[cd->channel][i][1] = -1;
    }
  cd->points[cd->channel][0][0] = 0;
  cd->points[cd->channel][0][1] = 0;
  cd->points[cd->channel][16][0] = 255;
  cd->points[cd->channel][16][1] = 255;

  curves_update (cd, GRAPH | XRANGE_TOP | DRAW);
  if (cd->preview)
    curves_preview (cd);
}

static void
curves_ok_callback (GtkWidget *widget,
		    gpointer   client_data)
{
  CurvesDialog *cd;

  cd = (CurvesDialog *) client_data;

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

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  active_tool->preserve = TRUE;  /* We're about to dirty... */

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  if (!cd->preview)
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    image_map_apply (cd->image_map, (ImageMapApplyFunc)gimp_lut_process_2,
		     (void *) cd->lut);
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  if (cd->image_map)
    image_map_commit (cd->image_map);

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  active_tool->preserve = FALSE;

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  cd->image_map = NULL;
}

static void
curves_cancel_callback (GtkWidget *widget,
			gpointer   client_data)
{
  CurvesDialog *cd;

  cd = (CurvesDialog *) client_data;
  if (GTK_WIDGET_VISIBLE (cd->shell))
    gtk_widget_hide (cd->shell);

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

  cd->image_map = NULL;
}

static gint 
curves_delete_callback (GtkWidget *w,
			GdkEvent *e,
			gpointer data) 
{
  curves_cancel_callback (w, data);

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  return TRUE;
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}
static void
curves_preview_update (GtkWidget *w,
		       gpointer   data)
{
  CurvesDialog *cd;

  cd = (CurvesDialog *) data;
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  if (GTK_TOGGLE_BUTTON (w)->active)
    {
      cd->preview = TRUE;
      curves_preview (cd);
    }
  else
    cd->preview = FALSE;
}

static gint
curves_graph_events (GtkWidget    *widget,
		     GdkEvent     *event,
		     CurvesDialog *cd)
{
  static GdkCursorType cursor_type = GDK_TOP_LEFT_ARROW;
  GdkCursorType new_type;
  GdkEventButton *bevent;
  GdkEventMotion *mevent;
  int i;
  int tx, ty;
  int x, y;
  int closest_point;
  int distance;
  int x1, x2, y1, y2;

  new_type      = GDK_X_CURSOR;
  closest_point = 0;

  /*  get the pointer position  */
  gdk_window_get_pointer (cd->graph->window, &tx, &ty, NULL);
  x = BOUNDS ((tx - RADIUS), 0, 255);
  y = BOUNDS ((ty - RADIUS), 0, 255);

  distance = G_MAXINT;
  for (i = 0; i < 17; i++)
    {
      if (cd->points[cd->channel][i][0] != -1)
	if (abs (x - cd->points[cd->channel][i][0]) < distance)
	  {
	    distance = abs (x - cd->points[cd->channel][i][0]);
	    closest_point = i;
	  }
    }
  if (distance > MIN_DISTANCE)
    closest_point = (x + 8) / 16;

  switch (event->type)
    {
    case GDK_EXPOSE:
      if (cd->pixmap == NULL)
	cd->pixmap = gdk_pixmap_new (cd->graph->window,
				     GRAPH_WIDTH + RADIUS * 2,
				     GRAPH_HEIGHT + RADIUS * 2, -1);

      curves_update (cd, GRAPH | DRAW);
      break;

    case GDK_BUTTON_PRESS:
      bevent = (GdkEventButton *) event;
      new_type = GDK_TCROSS;

      switch (cd->curve_type)
	{
	case SMOOTH:
	  /*  determine the leftmost and rightmost points  */
	  cd->leftmost = -1;
	  for (i = closest_point - 1; i >= 0; i--)
	    if (cd->points[cd->channel][i][0] != -1)
	      {
		cd->leftmost = cd->points[cd->channel][i][0];
		break;
	      }
	  cd->rightmost = 256;
	  for (i = closest_point + 1; i < 17; i++)
	    if (cd->points[cd->channel][i][0] != -1)
	      {
		cd->rightmost = cd->points[cd->channel][i][0];
		break;
	      }

	  cd->grab_point = closest_point;
	  cd->points[cd->channel][cd->grab_point][0] = x;
	  cd->points[cd->channel][cd->grab_point][1] = 255 - y;

	  break;

	case GFREE:
	  cd->curve[cd->channel][x] = 255 - y;
	  cd->grab_point = x;
	  cd->last = y;
	  break;
	}
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      curves_calculate_curve (cd);
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      curves_update (cd, GRAPH | XRANGE_TOP | DRAW);
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      gtk_grab_add(widget);

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      break;

    case GDK_BUTTON_RELEASE:
      new_type = GDK_FLEUR;
      cd->grab_point = -1;

      if (cd->preview)
	curves_preview (cd);
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      gtk_grab_remove(widget);

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      break;

    case GDK_MOTION_NOTIFY:
      mevent = (GdkEventMotion *) event;

      if (mevent->is_hint)
	{
	  mevent->x = tx;
	  mevent->y = ty;
	}

      switch (cd->curve_type)
	{
	case SMOOTH:
	  /*  If no point is grabbed...  */
	  if (cd->grab_point == -1)
	    {
	      if (cd->points[cd->channel][closest_point][0] != -1)
		new_type = GDK_FLEUR;
	      else
		new_type = GDK_TCROSS;
	    }
	  /*  Else, drag the grabbed point  */
	  else
	    {
	      new_type = GDK_TCROSS;

	      cd->points[cd->channel][cd->grab_point][0] = -1;

	      if (x > cd->leftmost && x < cd->rightmost)
		{
		  closest_point = (x + 8) / 16;
		  if (cd->points[cd->channel][closest_point][0] == -1)
		    cd->grab_point = closest_point;
		  cd->points[cd->channel][cd->grab_point][0] = x;
		  cd->points[cd->channel][cd->grab_point][1] = 255 - y;
		}

	      curves_calculate_curve (cd);
	      curves_update (cd, GRAPH | XRANGE_TOP | DRAW);
	    }
	  break;

	case GFREE:
	  if (cd->grab_point != -1)
	    {
	      if (cd->grab_point > x)
		{
		  x1 = x;
		  x2 = cd->grab_point;
		  y1 = y;
		  y2 = cd->last;
		}
	      else
		{
		  x1 = cd->grab_point;
		  x2 = x;
		  y1 = cd->last;
		  y2 = y;
		}

	      if (x2 != x1)
		for (i = x1; i <= x2; i++)
		  cd->curve[cd->channel][i] = 255 - (y1 + ((y2 - y1) * (i - x1)) / (x2 - x1));
	      else
		cd->curve[cd->channel][x] = 255 - y;

	      cd->grab_point = x;
	      cd->last = y;

	      curves_update (cd, GRAPH | XRANGE_TOP | DRAW);
	    }

	  if (mevent->state & GDK_BUTTON1_MASK)
	    new_type = GDK_TCROSS;
	  else
	    new_type = GDK_PENCIL;
	  break;
	}

      if (new_type != cursor_type)
	{
	  cursor_type = new_type;
	  change_win_cursor (cd->graph->window, cursor_type);
	}
      break;

    default:
      break;
    }

  return FALSE;
}

static gint
curves_xrange_events (GtkWidget    *widget,
		      GdkEvent     *event,
		      CurvesDialog *cd)
{
  switch (event->type)
    {
    case GDK_EXPOSE:
      curves_update (cd, XRANGE_TOP | XRANGE_BOTTOM);
      break;

    case GDK_DELETE:
      break;

    default:
      break;
    }

  return FALSE;
}

static gint
curves_yrange_events (GtkWidget    *widget,
		      GdkEvent     *event,
		      CurvesDialog *cd)
{
  switch (event->type)
    {
    case GDK_EXPOSE:
      curves_update (cd, YRANGE);
      break;

    default:
      break;
    }

  return FALSE;
}

static void
curves_CR_compose (CRMatrix a,
		   CRMatrix b,
		   CRMatrix ab)
{
  int i, j;

  for (i = 0; i < 4; i++)
    {
      for (j = 0; j < 4; j++)
        {
          ab[i][j] = (a[i][0] * b[0][j] +
                      a[i][1] * b[1][j] +
                      a[i][2] * b[2][j] +
                      a[i][3] * b[3][j]);
        }
    }
}