gimpcurvestool.c 47 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 <stdlib.h>
#include <string.h>
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#include <gtk/gtk.h>

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#include "libgimpmath/gimpmath.h"
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#include "libgimpbase/gimpbase.h"
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#include "libgimpwidgets/gimpwidgets.h"
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#include "tools-types.h"

#include "base/gimphistogram.h"
#include "base/gimplut.h"

#include "core/gimpdrawable.h"
#include "core/gimpimage.h"

#include "widgets/gimpcursor.h"

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#include "display/gimpdisplay.h"
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#include "display/gimpdisplay-foreach.h"
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#include "gimpcurvestool.h"
#include "tool_manager.h"
#include "tool_options.h"
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#include "app_procs.h"
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#include "image_map.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
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 *  gimpcurvestool.h is large enough.
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 */
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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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typedef gdouble CRMatrix[4][4];
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/*  local function prototypes  */

static void   gimp_curves_tool_class_init     (GimpCurvesToolClass *klass);
static void   gimp_curves_tool_init           (GimpCurvesTool      *bc_tool);

static void   gimp_curves_tool_initialize     (GimpTool       *tool,
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					       GimpDisplay    *gdisp);
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static void   gimp_curves_tool_control        (GimpTool       *tool,
					       ToolAction      action,
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					       GimpDisplay    *gdisp);
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static void   gimp_curves_tool_button_press   (GimpTool       *tool,
					       GdkEventButton *bevent,
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					       GimpDisplay    *gdisp);
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static void   gimp_curves_tool_button_release (GimpTool       *tool,
					       GdkEventButton *bevent,
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					       GimpDisplay    *gdisp);
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static void   gimp_curves_tool_motion         (GimpTool       *tool,
					       GdkEventMotion *mevent,
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					       GimpDisplay    *gdisp);
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static void   curves_colour_update            (GimpTool       *tool,
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					       GimpDisplay    *gdisp,
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					       GimpDrawable   *drawable,
					       gint            x,
					       gint            y);
static void   curves_add_point                (GimpDrawable   *drawable,
					       gint            x,
					       gint            y,
					       gint            cchan);
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static CurvesDialog * curves_dialog_new   (void);

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static void   curves_dialog_hide          (void);
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static void   curves_update               (CurvesDialog   *cd,
					   gint            );
static void   curves_plot_curve           (CurvesDialog   *cd,
					   gint            ,
					   gint            ,
					   gint            ,
					   gint            );
static void   curves_preview              (CurvesDialog   *cd);

static void   curves_channel_callback     (GtkWidget      *widget,
					   gpointer        data);

static void   curves_smooth_callback      (GtkWidget      *widget,
					   gpointer        data);
static void   curves_free_callback        (GtkWidget      *widget,
					   gpointer        data);

static void   curves_channel_reset        (gint            );
static void   curves_reset_callback       (GtkWidget      *widget,
					   gpointer        data);
static void   curves_ok_callback          (GtkWidget      *widget,
					   gpointer        data);
static void   curves_cancel_callback      (GtkWidget      *widget,
					   gpointer        data);
static void   curves_load_callback        (GtkWidget      *widget,
					   gpointer        data);
static void   curves_save_callback        (GtkWidget      *widget,
					   gpointer        data);
static void   curves_preview_update       (GtkWidget      *widget,
					   gpointer        data);
static gint   curves_xrange_events        (GtkWidget      *widget,
					   GdkEvent       *event,
					   CurvesDialog   *cd);
static gint   curves_yrange_events        (GtkWidget      *widget,
					   GdkEvent       *event,
					   CurvesDialog   *cd);
static gint   curves_graph_events         (GtkWidget      *widget,
					   GdkEvent       *event,
					   CurvesDialog   *cd);
static void   curves_CR_compose           (CRMatrix        ,
					   CRMatrix        ,
					   CRMatrix        );

static void   file_dialog_create          (GtkWidget      *widget);
static void   file_dialog_ok_callback     (GtkWidget      *widget,
					   gpointer        data);
static void   file_dialog_cancel_callback (GtkWidget      *widget,
					   gpointer        data);

static gboolean  curves_read_from_file    (FILE           *f);
static void      curves_write_to_file     (FILE           *f);
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/*  the curves tool options  */
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static GimpToolOptions  * curves_options = NULL;
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/*  the curves dialog  */
static CurvesDialog * curves_dialog = NULL;

static GimpImageMapToolClass *parent_class = NULL;

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

static GtkWidget *channel_items[5];

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 },
};


/*  functions  */

void
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gimp_curves_tool_register (Gimp *gimp)
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{
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  tool_manager_register_tool (gimp,
			      GIMP_TYPE_CURVES_TOOL,
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                              FALSE,
			      "gimp:curves_tool",
			      _("Curves"),
			      _("Adjust color curves"),
			      N_("/Image/Colors/Curves..."), NULL,
			      NULL, "tools/curves.html",
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			      GIMP_STOCK_TOOL_CURVES);
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}

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GType
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gimp_curves_tool_get_type (void)
{
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  static GType tool_type = 0;
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  if (! tool_type)
    {
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      static const GTypeInfo tool_info =
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      {
        sizeof (GimpCurvesToolClass),
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	(GBaseInitFunc) NULL,
	(GBaseFinalizeFunc) NULL,
	(GClassInitFunc) gimp_curves_tool_class_init,
	NULL,           /* class_finalize */
	NULL,           /* class_data     */
	sizeof (GimpCurvesTool),
	0,              /* n_preallocs    */
	(GInstanceInitFunc) gimp_curves_tool_init,
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      };

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      tool_type = g_type_register_static (GIMP_TYPE_IMAGE_MAP_TOOL,
					  "GimpCurvesTool", 
                                          &tool_info, 0);
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    }

  return tool_type;
}

static void
gimp_curves_tool_class_init (GimpCurvesToolClass *klass)
{
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  GimpToolClass *tool_class;
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  tool_class = GIMP_TOOL_CLASS (klass);
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  parent_class = g_type_class_peek_parent (klass);
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  tool_class->initialize     = gimp_curves_tool_initialize;
  tool_class->control        = gimp_curves_tool_control;
  tool_class->button_press   = gimp_curves_tool_button_press;
  tool_class->button_release = gimp_curves_tool_button_release;
  tool_class->motion         = gimp_curves_tool_motion;
}

static void
gimp_curves_tool_init (GimpCurvesTool *bc_tool)
{
  GimpTool *tool;

  tool = GIMP_TOOL (bc_tool);

  if (! curves_options)
    {
      curves_options = tool_options_new ();

      tool_manager_register_tool_options (GIMP_TYPE_CURVES_TOOL,
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					  (GimpToolOptions *) curves_options);
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    }
}

static void
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gimp_curves_tool_initialize (GimpTool    *tool,
			     GimpDisplay *gdisp)
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{
  gint i, j;

  if (! gdisp)
    {
      curves_dialog_hide ();
      return;
    }

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

  /*  The curves dialog  */
  if (!curves_dialog)
    {
      curves_dialog = curves_dialog_new ();
    }
     
  /*  Initialize the values  */
  curves_dialog->channel = GIMP_HISTOGRAM_VALUE;
  for (i = 0; i < 5; i++)
    for (j = 0; j < 256; j++)
      curves_dialog->curve[i][j] = j;
  
  for (i = 0; i < 5; i++)
    {
      curves_channel_reset (i);
    }

  curves_dialog->drawable  = gimp_image_active_drawable (gdisp->gimage);
  curves_dialog->color     = gimp_drawable_is_rgb (curves_dialog->drawable);
  curves_dialog->image_map = image_map_create (gdisp, curves_dialog->drawable);

  /* check for alpha channel */
  if (gimp_drawable_has_alpha (curves_dialog->drawable))
    gtk_widget_set_sensitive (channel_items[4], TRUE);
  else 
    gtk_widget_set_sensitive (channel_items[4], 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], TRUE);
  else 
    for (i = 1; i < 4; i++) 
      gtk_widget_set_sensitive (channel_items[i], FALSE);

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

  gimp_lut_setup (curves_dialog->lut, 
		  (GimpLutFunc) curves_lut_func,
                  (gpointer) curves_dialog, 
		  gimp_drawable_bytes (curves_dialog->drawable));

  if (!GTK_WIDGET_VISIBLE (curves_dialog->shell))
    gtk_widget_show (curves_dialog->shell);

  curves_update (curves_dialog, GRAPH | DRAW);
}

static void
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gimp_curves_tool_control (GimpTool    *tool,
			  ToolAction   action,
			  GimpDisplay *gdisp)
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{
  switch (action)
    {
    case PAUSE:
      break;

    case RESUME:
      break;

    case HALT:
      curves_dialog_hide ();
      break;

    default:
      break;
    }

  if (GIMP_TOOL_CLASS (parent_class)->control)
    GIMP_TOOL_CLASS (parent_class)->control (tool, action, gdisp);
}

static void
gimp_curves_tool_button_press (GimpTool       *tool,
			       GdkEventButton *bevent,
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			       GimpDisplay    *gdisp)
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{
  gint          x, y;
  GimpDrawable *drawable;

  drawable = gimp_image_active_drawable (gdisp->gimage);

  tool->gdisp = gdisp;

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

      curves_dialog->drawable = drawable;
      curves_dialog->color = gimp_drawable_is_rgb (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);
}

static void
gimp_curves_tool_button_release (GimpTool       *tool,
				 GdkEventButton *bevent,
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				 GimpDisplay    *gdisp)
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{
  gint          x, y;
  GimpDrawable *drawable;

  if (! curves_dialog || 
      ! gdisp || 
      ! (drawable = gimp_image_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);

  if (bevent->state & GDK_SHIFT_MASK)
    {
      curves_add_point (drawable, x, y, curves_dialog->channel);
      curves_calculate_curve (curves_dialog);
    }
  else if (bevent->state & GDK_CONTROL_MASK)
    {
      curves_add_point (drawable, x, y, GIMP_HISTOGRAM_VALUE);
      curves_add_point (drawable, x, y, GIMP_HISTOGRAM_RED);
      curves_add_point (drawable, x, y, GIMP_HISTOGRAM_GREEN);
      curves_add_point (drawable, x, y, GIMP_HISTOGRAM_BLUE);
      curves_add_point (drawable, x, y, GIMP_HISTOGRAM_ALPHA);
      curves_calculate_curve (curves_dialog);
    }

  curves_update (curves_dialog, GRAPH | DRAW);
}

static void
gimp_curves_tool_motion (GimpTool       *tool,
			 GdkEventMotion *mevent,
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			 GimpDisplay    *gdisp)
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{
  gint          x, y;
  GimpDrawable *drawable;

  if (! curves_dialog ||
      ! gdisp || 
      ! (drawable = gimp_image_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);
  curves_update (curves_dialog, GRAPH | DRAW);
}


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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;
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  gdouble inten;
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  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 (GimpTool       *tool,
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		      GimpDisplay    *gdisp,
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		      GimpDrawable   *drawable,
		      gint            x,
		      gint            y)
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{
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  guchar        *color;
  gint           offx;
  gint           offy;
  gint           maxval;
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  gboolean       has_alpha;
  gboolean       is_indexed;
  GimpImageType  sample_type;
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  if (!tool || tool->state != ACTIVE)
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    return;

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  gimp_drawable_offsets (drawable, &offx, &offy);
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  x -= offx;
  y -= offy;

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  if (!(color = image_map_get_color_at (curves_dialog->image_map, x, y)))
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    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[GIMP_HISTOGRAM_RED] = color[RED_PIX];
  curves_dialog->col_value[GIMP_HISTOGRAM_GREEN] = color[GREEN_PIX];
  curves_dialog->col_value[GIMP_HISTOGRAM_BLUE] = color[BLUE_PIX];
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  if (has_alpha)
    {
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      curves_dialog->col_value [GIMP_HISTOGRAM_ALPHA] = color[3];
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    }

  if (is_indexed)
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    curves_dialog->col_value [GIMP_HISTOGRAM_ALPHA] = color[4];
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  maxval = MAX (color[RED_PIX], color[GREEN_PIX]);
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  curves_dialog->col_value[GIMP_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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}

void
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curves_free (void)
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{
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  GimpTool *active_tool;

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  if (curves_dialog)
    {
      if (curves_dialog->image_map)
	{
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	  active_tool = tool_manager_get_active (the_gimp);

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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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      gtk_widget_destroy (curves_dialog->shell);

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      if (curves_dialog->pixmap)
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	gdk_drawable_unref (curves_dialog->pixmap);
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      if (curves_dialog->cursor_layout)
        g_object_unref (curves_dialog->cursor_layout);
      if (curves_dialog->xpos_layout)
        g_object_unref (curves_dialog->xpos_layout);

      if (curves_dialog->lut)
        gimp_lut_free (curves_dialog->lut);

      g_free (curves_dialog);
      curves_dialog = NULL;
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    }
}

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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->preview       = TRUE;
  cd->pixmap        = NULL;
  cd->xpos_layout   = NULL;
  cd->cursor_layout = NULL;
  cd->channel       = GIMP_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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			       tool_manager_help_func, NULL,
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			       GTK_WIN_POS_NONE,
			       FALSE, TRUE, FALSE,

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			       GTK_STOCK_OK, curves_ok_callback,
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			       cd, NULL, NULL, TRUE, FALSE,
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			       GIMP_STOCK_RESET, curves_reset_callback,
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			       cd, NULL, NULL, FALSE, FALSE,
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			       GTK_STOCK_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
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    (FALSE,
     G_CALLBACK (curves_channel_callback),
     cd,
     GINT_TO_POINTER (cd->channel),
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     _("Value"), GINT_TO_POINTER (GIMP_HISTOGRAM_VALUE), &channel_items[0],
     _("Red"),   GINT_TO_POINTER (GIMP_HISTOGRAM_RED),   &channel_items[1],
     _("Green"), GINT_TO_POINTER (GIMP_HISTOGRAM_GREEN), &channel_items[2],
     _("Blue"),  GINT_TO_POINTER (GIMP_HISTOGRAM_BLUE),  &channel_items[3],
     _("Alpha"), GINT_TO_POINTER (GIMP_HISTOGRAM_ALPHA), &channel_items[4],
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     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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  g_signal_connect (G_OBJECT (cd->yrange), "event",
		    G_CALLBACK (curves_yrange_events),
		    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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  g_signal_connect (G_OBJECT (cd->graph), "event",
		    G_CALLBACK (curves_graph_events),
		    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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  g_signal_connect (G_OBJECT (cd->xrange), "event",
		    G_CALLBACK (curves_xrange_events),
		    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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  g_signal_connect (G_OBJECT (toggle), "toggled",
		    G_CALLBACK (curves_preview_update),
		    cd);
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  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_widget_show (button);

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  g_signal_connect (G_OBJECT (button), "clicked",
		    G_CALLBACK (curves_load_callback),
		    cd->shell);

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  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_widget_show (button);

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  g_signal_connect (G_OBJECT (button), "clicked",
		    G_CALLBACK (curves_save_callback),
		    cd->shell);

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  gtk_widget_show (hbbox);
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  gtk_widget_show (vbox);

  return cd;
}

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

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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];
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  if (!cd->cursor_layout)
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    {
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      cd->cursor_layout = gtk_widget_create_pango_layout (cd->graph,
                                                          "x:888 y:888");
      pango_layout_get_pixel_extents (cd->cursor_layout, 
                                      NULL, &cd->cursor_rect);
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    }
  
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  if (xpos >= 0 && xpos <= 255 && ypos >=0 && ypos <= 255)
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    {
      gdk_draw_rectangle (cd->graph->window, 
			  cd->graph->style->bg_gc[GTK_STATE_ACTIVE],
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			  TRUE, 
                          RADIUS*2 + 2, 
                          RADIUS*2 + 2, 
			  cd->cursor_rect.width  + 4,
			  cd->cursor_rect.height + 5);
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      gdk_draw_rectangle (cd->graph->window, 
			  cd->graph->style->black_gc,
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			  FALSE, 
                          RADIUS*2 + 2, 
                          RADIUS*2 + 2, 
			  cd->cursor_rect.width  + 3, 
			  cd->cursor_rect.height + 4);
      
      g_snprintf (buf, sizeof (buf), "x:%3d y:%3d",xpos, ypos);
      pango_layout_set_text (cd->cursor_layout, buf, 11);
      gdk_draw_layout (cd->graph->window, 
                       cd->graph->style->black_gc,
		       RADIUS*2 + 4 + cd->cursor_rect.x,
		       RADIUS*2 + 5 + cd->cursor_rect.y,
		       cd->cursor_layout);
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    }
}

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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   height;
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  gint   sel_channel;
  
  if(cd->color) {
    sel_channel = cd->channel;
  } else {
    if(cd->channel == 2)
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      sel_channel = GIMP_HISTOGRAM_ALPHA;
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    else
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      sel_channel = GIMP_HISTOGRAM_VALUE;
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  }

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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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	{
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	case GIMP_HISTOGRAM_VALUE:
	case GIMP_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 GIMP_HISTOGRAM_RED:
	case GIMP_HISTOGRAM_GREEN:
	case GIMP_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++)
		  {
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		    buf[j*3+0] = cd->curve[GIMP_HISTOGRAM_RED][j];
		    buf[j*3+1] = cd->curve[GIMP_HISTOGRAM_GREEN][j];
		    buf[j*3+2] = cd->curve[GIMP_HISTOGRAM_BLUE][j];
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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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	  }

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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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	    {
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	    case GIMP_HISTOGRAM_VALUE:
	    case GIMP_HISTOGRAM_ALPHA:
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	      pix[0] = pix[1] = pix[2] = (255 - i);
	      break;

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	    case GIMP_HISTOGRAM_RED:
	    case GIMP_HISTOGRAM_GREEN:
	    case GIMP_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->xpos_layout)
        cd->xpos_layout = gtk_widget_create_pango_layout (cd->graph, buf);
      else
        pango_layout_set_text (cd->xpos_layout, buf, -1);

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      if ((cd->col_value[sel_channel]+RADIUS) < 127)
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	{
	  offset = RADIUS + 4;
	}
      else
	{
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          pango_layout_get_pixel_size (cd->xpos_layout, &offset, &height);
          offset = - (offset + 2);
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	}

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      gdk_draw_layout (cd->pixmap,
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		       cd->graph->style->black_gc,
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		       cd->col_value[sel_channel] + offset,
		       GRAPH_HEIGHT - height - 2,
		       cd->xpos_layout);

      gdk_draw_drawable (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] =