gimpcurvestool.c 42.8 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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 */
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#include "config.h"

#include <stdio.h>

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#include "appenv.h"
#include "cursorutil.h"
#include "drawable.h"
#include "gdisplay.h"
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#include "gimphistogram.h"
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#include "gimpui.h"
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#include "curves.h"
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#include "gimplut.h"
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#include "libgimp/gimpenv.h"
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#include "libgimp/gimpmath.h"
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#include "libgimp/gimpintl.h"

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#define GRAPH          0x1
#define XRANGE_TOP     0x2
#define XRANGE_BOTTOM  0x4
#define YRANGE         0x8
#define DRAW          0x10
#define ALL           0xFF
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/*  NB: take care when changing these values: make sure the curve[] array in
 *  curves.h is large enough.
 */
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#define GRAPH_WIDTH    256
#define GRAPH_HEIGHT   256
#define XRANGE_WIDTH   256
#define XRANGE_HEIGHT   16
#define YRANGE_WIDTH    16
#define YRANGE_HEIGHT  256
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#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
{
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  gint x, y;    /*  coords for last mouse click  */
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};

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typedef gdouble 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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/*  the curves file dialog  */
static GtkWidget *file_dlg = NULL;
static gboolean   load_save;

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static GtkWidget *channel_items[5];

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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);
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static void   curves_control        (Tool *, ToolAction,       gpointer);

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static CurvesDialog * curves_dialog_new (void);
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static void   curves_update           (CurvesDialog *, int);
static void   curves_plot_curve       (CurvesDialog *, int, int, int, int);
static void   curves_preview          (CurvesDialog *);

static void   curves_channel_callback (GtkWidget *, gpointer);

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static void   curves_smooth_callback      (GtkWidget *, gpointer);
static void   curves_free_callback        (GtkWidget *, gpointer);
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static void   curves_channel_reset        (int);
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static void   curves_reset_callback       (GtkWidget *, gpointer);
static void   curves_ok_callback          (GtkWidget *, gpointer);
static void   curves_cancel_callback      (GtkWidget *, gpointer);
static void   curves_load_callback        (GtkWidget *, gpointer);
static void   curves_save_callback        (GtkWidget *, 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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static void   file_dialog_create          (GtkWidget *);
static void   file_dialog_ok_callback     (GtkWidget *, gpointer);
static void   file_dialog_cancel_callback (GtkWidget *, gpointer);
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static gboolean  curves_read_from_file    (FILE *f);
static void      curves_write_to_file     (FILE *f);
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/*  curves machinery  */

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gfloat
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curves_lut_func (CurvesDialog *cd,
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		 gint          nchannels,
		 gint          channel,
		 gfloat        value)
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{
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  gfloat f;
  gint index;
  gdouble inten;
  gint j;
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  if (nchannels == 1)
    j = 0;
  else
    j = channel + 1;
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  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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}

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

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  sample_type = gimp_drawable_type (drawable);
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  is_indexed  = gimp_drawable_is_indexed (drawable);
  has_alpha   = GIMP_IMAGE_TYPE_HAS_ALPHA (sample_type);
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  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];

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  maxval = MAX (color[RED_PIX], color[GREEN_PIX]);
  curves_dialog->col_value[HISTOGRAM_VALUE] = MAX (maxval, color[BLUE_PIX]);
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  g_free (color);
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}
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static void
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curves_add_point (GimpDrawable *drawable,
		  gint          x,
		  gint          y,
		  gint          cchan)
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{
  /* Add point onto the curve */
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  gint closest_point = 0;
  gint distance;
  gint curvex;
  gint i;
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  switch (curves_dialog->curve_type[cchan])
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    {
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    case SMOOTH:
      curvex = curves_dialog->col_value[cchan];
      distance = G_MAXINT;
      for (i = 0; i < 17; i++)
	{
	  if (curves_dialog->points[cchan][i][0] != -1)
	    if (abs (curvex - curves_dialog->points[cchan][i][0]) < distance)
	      {
		distance = abs (curvex - curves_dialog->points[cchan][i][0]);
		closest_point = i;
	      }
	}
      
      if (distance > MIN_DISTANCE)
	closest_point = (curvex + 8) / 16;
      
      curves_dialog->points[cchan][closest_point][0] = curvex;
      curves_dialog->points[cchan][closest_point][1] = curves_dialog->curve[cchan][curvex];
      break;
      
    case GFREE:
      curves_dialog->curve[cchan][x] = 255 - y;
      break;
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    }
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}

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/*  curves action functions  */

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

  tool->gdisp_ptr = gdisp;

  if (drawable != tool->drawable)
    {
      active_tool->preserve = TRUE;
      image_map_abort (curves_dialog->image_map);
      active_tool->preserve = FALSE;

      tool->drawable = drawable;

      curves_dialog->drawable = drawable;
      curves_dialog->color = drawable_color (drawable);
      curves_dialog->image_map = image_map_create (gdisp, drawable);
    }

  tool->state = ACTIVE;

  gdisplay_untransform_coords (gdisp, bevent->x, bevent->y, &x, &y,
			       FALSE, FALSE);
  curves_colour_update (tool, gdisp, drawable, x, y);
  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;
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  GimpDrawable *drawable;
  GDisplay     *gdisp;
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  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);
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  curves_colour_update (tool, gdisp, drawable, x, y);
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  if (bevent->state & GDK_SHIFT_MASK)
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    {
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      curves_add_point (drawable, x, y, curves_dialog->channel);
      curves_calculate_curve (curves_dialog);
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    }
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  else if (bevent->state & GDK_CONTROL_MASK)
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    {
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      curves_add_point (drawable, x, y, HISTOGRAM_VALUE);
      curves_add_point (drawable, x, y, HISTOGRAM_RED);
      curves_add_point (drawable, x, y, HISTOGRAM_GREEN);
      curves_add_point (drawable, x, y, HISTOGRAM_BLUE);
      curves_add_point (drawable, x, y, HISTOGRAM_ALPHA);
      curves_calculate_curve (curves_dialog);
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    }

  curves_update (curves_dialog, GRAPH | DRAW);
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}

static void
curves_motion (Tool           *tool,
	       GdkEventMotion *mevent,
	       gpointer        gdisp_ptr)
{
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  gint x, y;
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  GDisplay     *gdisp;
  GimpDrawable *drawable;
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  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);
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  curves_colour_update (tool, gdisp, drawable, x, y);
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  curves_update (curves_dialog, GRAPH | DRAW);
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}

static void
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curves_control (Tool       *tool,
		ToolAction  action,
		gpointer    gdisp_ptr)
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{
  switch (action)
    {
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    case PAUSE:
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      break;
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    case RESUME:
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      break;
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    case HALT:
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      curves_dialog_hide ();
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      break;
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    default:
      break;
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    }
}

Tool *
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tools_new_curves (void)
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{
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  Tool   *tool;
  Curves *private;
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  /*  The tool options  */
  if (!curves_options)
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    {
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      curves_options = tool_options_new (_("Curves"));
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      tools_register (CURVES, curves_options);
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    }
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  tool = tools_new_tool (CURVES);
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  private = g_new0 (Curves, 1);
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  tool->scroll_lock = TRUE;   /*  Disallow scrolling  */
  tool->preserve    = FALSE;  /*  Don't preserve on drawable change  */
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  tool->private = (void *) private;
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  tool->button_press_func   = curves_button_press;
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  tool->button_release_func = curves_button_release;
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  tool->motion_func         = curves_motion;
  tool->control_func        = curves_control;
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  return tool;
}

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void
curves_dialog_hide (void)
{
  if (curves_dialog)
    curves_cancel_callback (NULL, (gpointer) curves_dialog);
}

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void
tools_free_curves (Tool *tool)
{
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  Curves *private;
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  private = (Curves *) tool->private;
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  /*  Close the color select dialog  */
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  curves_dialog_hide ();
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  g_free (private);
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}

void
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curves_initialize (GDisplay *gdisp)
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{
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  gint i, j;
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  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)
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    {
      curves_dialog = curves_dialog_new ();
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      /*  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;
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      for (i = 0; i < 5; i++)
        {
	    curves_channel_reset (i);
        }
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    }

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  curves_dialog->drawable = gimage_active_drawable (gdisp->gimage);
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  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], TRUE);
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  else 
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    gtk_widget_set_sensitive (channel_items[4], FALSE);
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  /*  hide or show the channel menu based on image type  */
  if (curves_dialog->color)
    for (i = 0; i < 4; i++) 
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       gtk_widget_set_sensitive (channel_items[i], TRUE);
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  else 
    for (i = 1; i < 4; i++) 
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      gtk_widget_set_sensitive (channel_items[i], FALSE);
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  /* set the current selection */
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  gtk_option_menu_set_history (GTK_OPTION_MENU (curves_dialog->channel_menu),
			       curves_dialog->channel);
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  gimp_lut_setup (curves_dialog->lut, (GimpLutFunc) curves_lut_func,
                  (void *) curves_dialog, gimp_drawable_bytes (curves_dialog->drawable));

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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
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curves_free (void)
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{
  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;
	}
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      if (curves_dialog->pixmap)
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	gdk_pixmap_unref (curves_dialog->pixmap);
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      gtk_widget_destroy (curves_dialog->shell);
    }
}

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/*******************/
/*  Curves dialog  */
/*******************/
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static CurvesDialog *
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curves_dialog_new (void)
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{
  CurvesDialog *cd;
  GtkWidget *vbox;
  GtkWidget *hbox;
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  GtkWidget *hbbox;
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  GtkWidget *label;
  GtkWidget *frame;
  GtkWidget *toggle;
  GtkWidget *channel_hbox;
  GtkWidget *table;
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  GtkWidget *button;
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  gint i, j;
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  cd = g_new (CurvesDialog, 1);
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  cd->cursor_ind_height = -1;
  cd->cursor_ind_width  = -1;
  cd->preview           = TRUE;
  cd->pixmap            = NULL;
  cd->channel           = HISTOGRAM_VALUE;
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  for (i = 0; i < 5; i++)
    cd->curve_type[i] = SMOOTH;

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  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++)
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    cd->col_value[i] = 0;

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  cd->lut = gimp_lut_new ();
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  /*  The shell and main vbox  */
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  cd->shell = gimp_dialog_new (_("Curves"), "curves",
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			       tools_help_func, tool_info[CURVES].private_tip,
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			       GTK_WIN_POS_NONE,
			       FALSE, TRUE, FALSE,

			       _("OK"), curves_ok_callback,
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			       cd, NULL, NULL, TRUE, FALSE,
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			       _("Reset"), curves_reset_callback,
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			       cd, NULL, NULL, FALSE, FALSE,
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			       _("Cancel"), curves_cancel_callback,
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			       cd, NULL, NULL, FALSE, TRUE,
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			       NULL);
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  vbox = gtk_vbox_new (FALSE, 4);
  gtk_container_set_border_width (GTK_CONTAINER (vbox), 4);
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  gtk_container_add (GTK_CONTAINER (GTK_DIALOG (cd->shell)->vbox), vbox);
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  /*  The option menu for selecting channels  */
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  channel_hbox = gtk_hbox_new (FALSE, 4);
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  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);

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  cd->channel_menu = gimp_option_menu_new2
    (FALSE, curves_channel_callback,
     cd, (gpointer) cd->channel,

     _("Value"), (gpointer) HISTOGRAM_VALUE, &channel_items[0],
     _("Red"),   (gpointer) HISTOGRAM_RED,   &channel_items[1],
     _("Green"), (gpointer) HISTOGRAM_GREEN, &channel_items[2],
     _("Blue"),  (gpointer) HISTOGRAM_BLUE,  &channel_items[3],
     _("Alpha"), (gpointer) HISTOGRAM_ALPHA, &channel_items[4],

     NULL);

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  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);

  /*  The table for the yrange and the graph  */
  table = gtk_table_new (2, 2, FALSE);
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  gtk_table_set_col_spacings (GTK_TABLE (table), 2);
  gtk_table_set_row_spacings (GTK_TABLE (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);

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  cd->yrange = gtk_preview_new (GTK_PREVIEW_COLOR);
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  gtk_preview_size (GTK_PREVIEW (cd->yrange), YRANGE_WIDTH, YRANGE_HEIGHT);
  gtk_widget_set_events (cd->yrange, RANGE_MASK);
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  gtk_container_add (GTK_CONTAINER (frame), cd->yrange);

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  gtk_signal_connect (GTK_OBJECT (cd->yrange), "event",
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		      GTK_SIGNAL_FUNC (curves_yrange_events),
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		      cd);
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  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,
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		    GTK_SHRINK | GTK_FILL,
		    GTK_SHRINK | GTK_FILL, 0, 0);
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  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);
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  gtk_container_add (GTK_CONTAINER (frame), cd->graph);

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  gtk_signal_connect (GTK_OBJECT (cd->graph), "event",
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		      GTK_SIGNAL_FUNC (curves_graph_events),
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		      cd);
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  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);

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  cd->xrange = gtk_preview_new (GTK_PREVIEW_COLOR);
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  gtk_preview_size (GTK_PREVIEW (cd->xrange), XRANGE_WIDTH, XRANGE_HEIGHT);
  gtk_widget_set_events (cd->xrange, RANGE_MASK);
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  gtk_container_add (GTK_CONTAINER (frame), cd->xrange);

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  gtk_signal_connect (GTK_OBJECT (cd->xrange), "event",
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		      GTK_SIGNAL_FUNC (curves_xrange_events),
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		      cd);
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  gtk_widget_show (cd->xrange);
  gtk_widget_show (frame);
  gtk_widget_show (table);

  /*  Horizontal box for preview  */
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  hbox = gtk_hbox_new (FALSE, 4);
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  gtk_box_pack_end (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
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  /*  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);
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  gtk_widget_show (label);
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  cd->curve_type_menu = gimp_option_menu_new
    (FALSE,
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     _("Smooth"), curves_smooth_callback, cd, NULL, NULL, TRUE,
     _("Free"),   curves_free_callback,   cd, NULL, NULL, FALSE,

     NULL);
  gtk_box_pack_start (GTK_BOX (hbox), cd->curve_type_menu, FALSE, FALSE, 2);
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  gtk_widget_show (cd->curve_type_menu);
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  gtk_widget_show (hbox);

  /*  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_end (GTK_BOX (hbox), toggle, FALSE, FALSE, 0);

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  gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
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		      GTK_SIGNAL_FUNC (curves_preview_update),
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		      cd);

  gtk_widget_show (toggle);
  gtk_widget_show (hbox);

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  /*  Horizontal button box for load / save  */
  hbbox = gtk_hbutton_box_new ();
  gtk_button_box_set_spacing (GTK_BUTTON_BOX (hbbox), 4);
  gtk_button_box_set_layout (GTK_BUTTON_BOX (hbbox), GTK_BUTTONBOX_SPREAD);
  gtk_box_pack_end (GTK_BOX (vbox), hbbox, FALSE, FALSE, 0);

  button = gtk_button_new_with_label (_("Load"));
  GTK_WIDGET_SET_FLAGS (button, GTK_CAN_DEFAULT);
  gtk_box_pack_start (GTK_BOX (hbbox), button, FALSE, FALSE, 0);
  gtk_signal_connect (GTK_OBJECT (button), "clicked",
		      GTK_SIGNAL_FUNC (curves_load_callback),
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		      cd->shell);
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  gtk_widget_show (button);

  button = gtk_button_new_with_label (_("Save"));
  GTK_WIDGET_SET_FLAGS (button, GTK_CAN_DEFAULT);
  gtk_box_pack_start (GTK_BOX (hbbox), button, FALSE, FALSE, 0);
  gtk_signal_connect (GTK_OBJECT (button), "clicked",
		      GTK_SIGNAL_FUNC (curves_save_callback),
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		      cd->shell);
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  gtk_widget_show (button);

  gtk_widget_show (hbbox);
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  gtk_widget_show (vbox);

  return cd;
}

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static void
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curve_print_loc (CurvesDialog *cd,
		 gint          xpos,
		 gint          ypos)
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{
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  gchar buf[32];
  gint  width;
  gint  ascent;
  gint  descent;
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  if (cd->cursor_ind_width < 0)
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    {
      /* Calc max extents */
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      gdk_string_extents (cd->graph->style->font,
			  "x:888 y:888",
			  NULL,
			  NULL,
			  &width,
			  &ascent,
			  &descent);
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      cd->cursor_ind_width = width;
      cd->cursor_ind_height = ascent + descent;
      cd->cursor_ind_ascent = ascent;
    }
  
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  if (xpos >= 0 && xpos <= 255 && ypos >=0 && ypos <= 255)
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    {
      g_snprintf (buf, sizeof (buf), "x:%d y:%d",xpos,ypos);

      gdk_draw_rectangle (cd->graph->window, 
			  cd->graph->style->bg_gc[GTK_STATE_ACTIVE],
			  TRUE, RADIUS*2 + 2 , RADIUS*2 + 2, 
			  cd->cursor_ind_width+4, 
			  cd->cursor_ind_height+5);

      gdk_draw_rectangle (cd->graph->window, 
			  cd->graph->style->black_gc,
			  FALSE, RADIUS*2 + 2 , RADIUS*2 + 2, 
			  cd->cursor_ind_width+3, 
			  cd->cursor_ind_height+4);

      gdk_draw_string (cd->graph->window,
		       cd->graph->style->font,
		       cd->graph->style->black_gc,
		       RADIUS*2 + 4,
		       RADIUS*2 + 5 + cd->cursor_ind_ascent,
		       buf);
    }
}

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/* TODO: preview alpha channel stuff correctly.  -- austin, 20/May/99 */
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static void
curves_update (CurvesDialog *cd,
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	       gint          update)
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{
  GdkRectangle area;
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  gint   i, j;
  gchar  buf[32];
  gint   offset;
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  gint   sel_channel;
  
  if(cd->color) {
    sel_channel = cd->channel;
  } else {
    if(cd->channel == 2)
      sel_channel = HISTOGRAM_ALPHA;
    else
      sel_channel = HISTOGRAM_VALUE;
  }

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  if (update & XRANGE_TOP)
    {
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      guchar buf[XRANGE_WIDTH * 3];
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      switch (sel_channel)
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	{
	case HISTOGRAM_VALUE:
	case HISTOGRAM_ALPHA:
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	  for (i = 0; i < XRANGE_HEIGHT / 2; i++)
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	    {
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	      for (j = 0; j < XRANGE_WIDTH ; j++)
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		{
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		  buf[j*3+0] = cd->curve[sel_channel][j];
		  buf[j*3+1] = cd->curve[sel_channel][j];
		  buf[j*3+2] = cd->curve[sel_channel][j];
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		}
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	      gtk_preview_draw_row (GTK_PREVIEW (cd->xrange),
				    buf, 0, i, XRANGE_WIDTH);
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	    }
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	  break;

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	case HISTOGRAM_RED:
	case HISTOGRAM_GREEN:
	case HISTOGRAM_BLUE:
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	  {
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	    for (i = 0; i < XRANGE_HEIGHT / 2; i++)
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	      {
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		for (j = 0; j < XRANGE_WIDTH; j++)
		  {
		    buf[j*3+0] = cd->curve[HISTOGRAM_RED][j];
		    buf[j*3+1] = cd->curve[HISTOGRAM_GREEN][j];
		    buf[j*3+2] = cd->curve[HISTOGRAM_BLUE][j];
		  }
		gtk_preview_draw_row (GTK_PREVIEW (cd->xrange),
				      buf, 0, i, XRANGE_WIDTH);
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	      }
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	    break;
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	  }

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	default:
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	  g_warning ("unknown channel type %d, can't happen!?!?",
		     cd->channel);
	  break;
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	}
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      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)
    {
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      guchar buf[XRANGE_WIDTH * 3];
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      for (i = 0; i < XRANGE_WIDTH; i++)
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      {
	buf[i*3+0] = i;
	buf[i*3+1] = i;
	buf[i*3+2] = i;
      }
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      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)
    {
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      guchar buf[YRANGE_WIDTH * 3];
      guchar pix[3];
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      for (i = 0; i < YRANGE_HEIGHT; i++)
	{
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	  switch (sel_channel)
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	    {
	    case HISTOGRAM_VALUE:
	    case HISTOGRAM_ALPHA:
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	      pix[0] = pix[1] = pix[2] = (255 - i);
	      break;

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	    case HISTOGRAM_RED:
	    case HISTOGRAM_GREEN:
	    case HISTOGRAM_BLUE:
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	      pix[0] = pix[1] = pix[2] = 0;
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	      pix[sel_channel - 1] = (255 - i);
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	      break;

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	    default:
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	      g_warning ("unknown channel type %d, can't happen!?!?",
			 cd->channel);
	      break;
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	    }
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	  for (j = 0; j < YRANGE_WIDTH * 3; j++)
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	    buf[j] = pix[j%3];
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	  gtk_preview_draw_row (GTK_PREVIEW (cd->yrange),
				buf, 0, i, YRANGE_WIDTH);
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	}

      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],
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			  TRUE, 0, 0,
			  GRAPH_WIDTH + RADIUS * 2, GRAPH_HEIGHT + RADIUS * 2);
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      /*  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  */
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      if (cd->curve_type[cd->channel] == SMOOTH)
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	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 */
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      gdk_draw_line (cd->pixmap, cd->graph->style->black_gc,
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		     cd->col_value[sel_channel]+RADIUS,RADIUS,
		     cd->col_value[sel_channel]+RADIUS,GRAPH_HEIGHT + RADIUS);
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      /* and xpos indicator */
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      g_snprintf (buf, sizeof (buf), "x:%d",cd->col_value[sel_channel]);
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      if ((cd->col_value[sel_channel]+RADIUS) < 127)
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	{
	  offset = RADIUS + 4;
	}
      else
	{
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	  offset = - gdk_string_width (cd->graph->style->font,buf) - 2;
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	}

      gdk_draw_string (cd->pixmap,
		       cd->graph->style->font,
		       cd->graph->style->black_gc,
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		       cd->col_value[sel_channel]+offset,
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		       GRAPH_HEIGHT,
		       buf);

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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);
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    }
}

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