gimp/app/paint/gimpconvolve.c

/* The GIMP -- an image manipulation program
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include "config.h"

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

#include "libgimpwidgets/gimpwidgets.h"

#include "apptypes.h"

#include "paint-funcs/paint-funcs.h"

#include "gimpconvolvetool.h"
#include "paint_options.h"
#include "tool_manager.h"
#include "tool_options.h"

#include "drawable.h"
#include "gdisplay.h"
#include "gimpimage.h"
#include "gimpbrush.h"
#include "gimpcontext.h"
#include "pixel_region.h"
#include "selection.h"
#include "temp_buf.h"

#include "libgimp/gimpintl.h"

#include "pixmaps2.h"


#define FIELD_COLS    4
#define MIN_BLUR      64         /*  (8/9 original pixel)   */
#define MAX_BLUR      0.25       /*  (1/33 original pixel)  */
#define MIN_SHARPEN   -512
#define MAX_SHARPEN   -64

/* defaults */
#define DEFAULT_CONVOLVE_RATE  50.0
#define DEFAULT_CONVOLVE_TYPE  BLUR_CONVOLVE


/* Different clip relationships between a blur-blob and edges: 
   see convolve_motion */

typedef enum
{
  CONVOLVE_NCLIP,       /* Left or top edge     */
  CONVOLVE_NOT_CLIPPED, /* No edges             */
  CONVOLVE_PCLIP        /* Right or bottom edge */
} ConvolveClipType;


/*  the convolve structures  */

typedef struct _ConvolveOptions ConvolveOptions;

struct _ConvolveOptions
{
  PaintOptions  paint_options;

  ConvolveType  type;
  ConvolveType  type_d;
  GtkWidget    *type_w[2];

  gdouble       rate;
  gdouble       rate_d;
  GtkObject    *rate_w;
};


/*  forward function declarations  */

static void   gimp_convolve_tool_class_init    (GimpConvolveToolClass *klass);
static void   gimp_convolve_tool_init          (GimpConvolveTool      *tool);

static void   calculate_matrix                 (ConvolveType          type,
						gdouble               rate);
static void   integer_matrix                   (gfloat               *source,
						gint                 *dest,
						gint                  size);
static void   copy_matrix                      (gfloat               *src,
						gfloat               *dest,
						gint                  size);
static gint   sum_matrix                       (gint                 *matrix,
						gint                  size);

static void   gimp_convolve_tool_paint         (GimpPaintTool        *paint_tool,
						GimpDrawable         *drawable,
						PaintState            state);
static void   gimp_convolve_tool_cursor_update (GimpTool             *tool,
						GdkEventMotion       *mevent,
						GDisplay             *gdisp);
static void   gimp_convolve_tool_modifier_key  (GimpTool             *tool,
					        GdkEventKey          *kevent,
						GDisplay             *gdisp);
static void   gimp_convolve_tool_motion        (GimpPaintTool        *paint_tool,
						GimpDrawable         *drawable, 
						PaintPressureOptions *pressure_options,
						ConvolveType          type,
						gdouble               rate);

static ConvolveOptions * convolve_options_new   (void);
static void              convolve_options_reset (ToolOptions *options);


/* The parent class */
static GimpPaintToolClass *parent_class;
 
/*  the convolve tool options  */
static ConvolveOptions * convolve_options = NULL;

/*  local variables  */
static gint         matrix [25];
static gint         matrix_size;
static gint         matrix_divisor;

static ConvolveType non_gui_type;
static gdouble      non_gui_rate;

static gfloat custom_matrix [25] =
{
  0, 0, 0, 0, 0,
  0, 0, 0, 0, 0,
  0, 0, 1, 0, 0,
  0, 0, 0, 0, 0,
  0, 0, 0, 0, 0,
};

static gfloat blur_matrix [25] =
{
  0, 0, 0, 0, 0,
  0, 1, 1, 1, 0,
  0, 1, MIN_BLUR, 1, 0,
  0, 1, 1, 1, 0,
  0, 0 ,0, 0, 0,
};

static gfloat sharpen_matrix [25] =
{
  0, 0, 0, 0, 0,
  0, 1, 1, 1, 0,
  0, 1, MIN_SHARPEN, 1, 0,
  0, 1, 1, 1, 0,
  0, 0, 0, 0, 0,
};


/* global functions  */

void
gimp_convolve_tool_register (void)
{
  tool_manager_register_tool (GIMP_TYPE_CONVOLVE_TOOL,
			      TRUE,
  			      "gimp:convolve_tool",
  			      _("Convolve"),
  			      _("Blur or Sharpen"),
      			      N_("/Tools/Paint Tools/Convolve"), "B",
  			      NULL, "tools/convolve.html",
			      (const gchar **) blur_bits);
}

GtkType
gimp_convolve_tool_get_type (void)
{
  static GtkType tool_type = 0;

  if (! tool_type)
    {
      GtkTypeInfo tool_info =
      {
        "GimpConvolveTool",
        sizeof (GimpConvolveTool),
        sizeof (GimpConvolveToolClass),
        (GtkClassInitFunc) gimp_convolve_tool_class_init,
        (GtkObjectInitFunc) gimp_convolve_tool_init,
        /* reserved_1 */ NULL,
        /* reserved_2 */ NULL,
        NULL
      };

      tool_type = gtk_type_unique (GIMP_TYPE_PAINT_TOOL, &tool_info);
    }

  return tool_type;
}

/* static functions  */

static void
gimp_convolve_tool_class_init (GimpConvolveToolClass *klass)
{
  GimpPaintToolClass *paint_tool_class;
  GimpDrawToolClass  *draw_tool_class;
  GimpToolClass      *tool_class;

  paint_tool_class = (GimpPaintToolClass *) klass;
  draw_tool_class  = (GimpDrawToolClass *) klass;
  tool_class       = (GimpToolClass *) klass;

  parent_class = gtk_type_class (GIMP_TYPE_PAINT_TOOL);

  tool_class->cursor_update = gimp_convolve_tool_cursor_update;
  tool_class->modifier_key  = gimp_convolve_tool_modifier_key;

  paint_tool_class->paint   = gimp_convolve_tool_paint;
}

static void
gimp_convolve_tool_init (GimpConvolveTool *convolve)
{
  GimpTool      *tool;
  GimpPaintTool *paint_tool;

  tool       = GIMP_TOOL (convolve);
  paint_tool = GIMP_PAINT_TOOL (convolve);

  if (! convolve_options)
    {
      convolve_options = convolve_options_new ();

      tool_manager_register_tool_options (GIMP_TYPE_CONVOLVE_TOOL,
                                          (ToolOptions *) convolve_options);
    }

  tool->tool_cursor = GIMP_BLUR_TOOL_CURSOR;
}

static void
gimp_convolve_tool_paint (GimpPaintTool    *paint_tool,
			  GimpDrawable     *drawable,
			  PaintState        state)
{
  switch (state)
    {
    case MOTION_PAINT:
      gimp_convolve_tool_motion (paint_tool, drawable, 
				 convolve_options->paint_options.pressure_options,
				 convolve_options->type, 
				 convolve_options->rate);
      break;

    default:
      break;
    }

}

static void
gimp_convolve_tool_modifier_key (GimpTool    *tool,
				 GdkEventKey *kevent,
				 GDisplay    *gdisp)
{
  switch (kevent->keyval)
    {
    case GDK_Alt_L: 
    case GDK_Alt_R:
      break;
    case GDK_Shift_L: 
    case GDK_Shift_R:
      if (kevent->state & GDK_CONTROL_MASK)    /* reset tool toggle */
	{
	  switch (convolve_options->type)
	    {
	    case BLUR_CONVOLVE:
	      gtk_toggle_button_set_active
		(GTK_TOGGLE_BUTTON (convolve_options->type_w[SHARPEN_CONVOLVE]),
		 TRUE);
	      break;
	    case SHARPEN_CONVOLVE:
	      gtk_toggle_button_set_active
		(GTK_TOGGLE_BUTTON (convolve_options->type_w[BLUR_CONVOLVE]),
		 TRUE);
	      break;
	    default:
	      break;
	    }
	}
      break;
    case GDK_Control_L: 
    case GDK_Control_R:
      if ( !(kevent->state & GDK_SHIFT_MASK) ) /* shift enables line draw mode */
	{
	  switch (convolve_options->type)
	    {
	    case BLUR_CONVOLVE:
	      gtk_toggle_button_set_active
		(GTK_TOGGLE_BUTTON (convolve_options->type_w[SHARPEN_CONVOLVE]),
		 TRUE);
	      break;
	    case SHARPEN_CONVOLVE:
	      gtk_toggle_button_set_active
		(GTK_TOGGLE_BUTTON (convolve_options->type_w[BLUR_CONVOLVE]),
		 TRUE);
	      break;
	    default:
	      break;
	    }
	}
      break;
    }

  tool->toggled = (convolve_options->type == SHARPEN_CONVOLVE);
}

static void
gimp_convolve_tool_cursor_update (GimpTool       *tool,
				  GdkEventMotion *mevent,
				  GDisplay       *gdisp)
{
  tool->toggled = (convolve_options->type == SHARPEN_CONVOLVE);

  if (GIMP_TOOL_CLASS (parent_class)->cursor_update)
    GIMP_TOOL_CLASS (parent_class)->cursor_update (tool, mevent, gdisp);
}

static void
gimp_convolve_tool_motion (GimpPaintTool        *paint_tool,
			   GimpDrawable         *drawable,
			   PaintPressureOptions *pressure_options,
			   ConvolveType          type,
			   double                rate)
{
  TempBuf          *area;
  guchar           *temp_data;
  PixelRegion       srcPR; 
  PixelRegion       destPR;
  gdouble           scale;
  ConvolveClipType  area_hclip = CONVOLVE_NOT_CLIPPED;
  ConvolveClipType  area_vclip = CONVOLVE_NOT_CLIPPED;
  gint              marginx    = 0;
  gint              marginy    = 0;

  if (! gimp_drawable_gimage (drawable))
    return;

  /*  If the image type is indexed, don't convolve  */
  if (gimp_drawable_is_indexed (drawable))
    return;

  /* If the brush is smaller than the convolution matrix, don't convolve */

  if ((paint_tool->brush->mask->width < matrix_size) ||
      (paint_tool->brush->mask->height < matrix_size))
    return;

  if (pressure_options->size)
    scale = paint_tool->curpressure;
  else
    scale = 1.0;

  /*  Get image region around current brush (mask bbox + 1 pixel)  */
  if (! (area = gimp_paint_tool_get_paint_area (paint_tool, drawable, scale)))
    return;

  /*  configure the source pixel region  */
  pixel_region_init (&srcPR, gimp_drawable_data (drawable),
		     area->x, area->y, area->width, area->height, FALSE);

  /* Configure the destination pixel region - a paint_core TempBuf */

  destPR.bytes     = area->bytes;
  destPR.tiles     = NULL;
  destPR.x         = 0; 
  destPR.y         = 0;
  destPR.w         = area->width;
  destPR.h         = area->height;
  destPR.rowstride = area->width * destPR.bytes;
  destPR.data      = temp_buf_data (area);

  if (pressure_options->rate)
    rate = rate * 2.0 * paint_tool->curpressure;

  calculate_matrix (type, rate); 
    
  /*  Image region near edges? If so, paint area will be clipped   */
  /*  with respect to brush mask + 1 pixel border (# 19285)        */

  if ((marginx = (gint) paint_tool->curx - paint_tool->brush->mask->width / 2 - 1) != area->x)
    area_hclip = CONVOLVE_NCLIP;
  else if ((marginx = area->width - paint_tool->brush->mask->width - 2) != 0)
    area_hclip = CONVOLVE_PCLIP;

  if ((marginy = (gint) paint_tool->cury - paint_tool->brush->mask->height / 2 - 1) != area->y)
    area_vclip = CONVOLVE_NCLIP;
  else if ((marginy = area->height - paint_tool->brush->mask->height - 2) != 0)
    area_vclip = CONVOLVE_PCLIP;

  /* Has the TempBuf been clipped by a canvas edge or two ?        */
  if ((area_hclip == CONVOLVE_NOT_CLIPPED)  &&
      (area_vclip == CONVOLVE_NOT_CLIPPED))
    {
      /* No clipping...                                              */
      /* Standard case: copy src to temp. convolve temp to dest.     */
      /* Brush defines pipe size and no edge adjustments are needed. */

      /*  If the source has no alpha, then add alpha pixels          */
      /*  Because paint_core.c is alpha-only code. See below.        */

      PixelRegion  tempPR;

      tempPR.x     = 0; 
      tempPR.y     = 0;
      tempPR.w     = area->width;
      tempPR.h     = area->height;
      tempPR.tiles = NULL;

      if (! gimp_drawable_has_alpha (drawable))
	{
	  /* note: this particular approach needlessly convolves the totally-
	     opaque alpha channel. A faster approach would be to keep
	     tempPR the same number of bytes as srcPR, and extend the
	     paint_core_replace_canvas API to handle non-alpha images. */

	  tempPR.bytes     = srcPR.bytes + 1;
	  tempPR.rowstride = tempPR.bytes * tempPR.w;
	  temp_data        = g_malloc (tempPR.h * tempPR.rowstride);
	  tempPR.data      = temp_data;
	  add_alpha_region (&srcPR, &tempPR);
	}
      else
	{
	  tempPR.bytes     = srcPR.bytes;
	  tempPR.rowstride = tempPR.bytes * tempPR.w;
	  temp_data        = g_malloc (tempPR.h * tempPR.rowstride);
	  tempPR.data      = temp_data;
	  copy_region (&srcPR, &tempPR);
	}

      /*  Convolve the region  */

      tempPR.x    = 0;
      tempPR.y    = 0;
      tempPR.w    = area->width;
      tempPR.h    = area->height;
      tempPR.data = temp_data;

      convolve_region (&tempPR, &destPR, matrix, matrix_size,
		       matrix_divisor, NORMAL_CONVOL);

      /*  Free the allocated temp space  */
      g_free (temp_data);
    }
  else
    {
      /* TempBuf clipping has occured on at least one edge...
       * Edge case: expand area under brush margin px on near edge(s), convolve
       * expanded buffers. copy src -> ovrsz1 convolve ovrsz1 -> ovrsz2
       * copy-with-crop ovrsz2 -> dest
       */
      PixelRegion   ovrsz1PR;
      PixelRegion   ovrsz2PR;
      guchar        *ovrsz1_data = NULL;
      guchar        *ovrsz2_data = NULL;
      guchar        *fillcolor;

      fillcolor = gimp_drawable_get_color_at
	(drawable,
	 CLAMP ((gint) paint_tool->curx, 0, gimp_drawable_width (drawable) - 1),
	 CLAMP ((gint) paint_tool->cury, 0, gimp_drawable_height (drawable) - 1));

      marginx *= (marginx < 0) ? -1 : 0;
      marginy *= (marginy < 0) ? -1 : 0;

      ovrsz2PR.x         = 0;
      ovrsz2PR.y         = 0;
      ovrsz2PR.w         = area->width  + marginx;
      ovrsz2PR.h         = area->height + marginy;
      ovrsz2PR.bytes     = (gimp_drawable_has_alpha (drawable))? srcPR.bytes : srcPR.bytes + 1; 
      ovrsz2PR.offx      = 0;
      ovrsz2PR.offy      = 0;
      ovrsz2PR.rowstride = ovrsz2PR.bytes * ovrsz2PR.w;
      ovrsz2PR.tiles     = NULL;
      ovrsz2_data        = g_malloc (ovrsz2PR.h * ovrsz2PR.rowstride);
      ovrsz2PR.data      = ovrsz2_data;

      ovrsz1PR.x         = 0;
      ovrsz1PR.y         = 0;
      ovrsz1PR.w         = area->width  + marginx;
      ovrsz1PR.h         = area->height + marginy;
      ovrsz1PR.bytes     = (gimp_drawable_has_alpha (drawable))? srcPR.bytes : srcPR.bytes + 1; 
      ovrsz1PR.offx      = 0;
      ovrsz1PR.offy      = 0;
      ovrsz1PR.rowstride = ovrsz2PR.bytes * ovrsz2PR.w;
      ovrsz1PR.tiles     = NULL;
      ovrsz1_data        = g_malloc (ovrsz1PR.h * ovrsz1PR.rowstride);
      ovrsz1PR.data      = ovrsz1_data;

      color_region (&ovrsz1PR, (const guchar *)fillcolor); 

      ovrsz1PR.x         = (area_hclip == CONVOLVE_NCLIP)? marginx : 0; 
      ovrsz1PR.y         = (area_vclip == CONVOLVE_NCLIP)? marginy : 0;
      ovrsz1PR.w         = area->width;
      ovrsz1PR.h         = area->height;
      ovrsz1PR.data      = ovrsz1_data + (ovrsz1PR.rowstride * ovrsz1PR.y) + (ovrsz1PR.bytes * ovrsz1PR.x);

      if (! gimp_drawable_has_alpha (drawable))
	add_alpha_region (&srcPR, &ovrsz1PR);
      else
	copy_region (&srcPR, &ovrsz1PR);

      /*  Convolve the region  */

      ovrsz1PR.x    = 0;
      ovrsz1PR.y    = 0;
      ovrsz1PR.w    = area->width  + marginx;
      ovrsz1PR.h    = area->height + marginy;
      ovrsz1PR.data = ovrsz1_data;

      convolve_region (&ovrsz1PR, &ovrsz2PR, matrix, matrix_size,
		       matrix_divisor, NORMAL_CONVOL);

      /* Crop and copy to destination */

      ovrsz2PR.x    = (area_hclip == CONVOLVE_NCLIP)? marginx : 0; 
      ovrsz2PR.y    = (area_vclip == CONVOLVE_NCLIP)? marginy : 0; 
      ovrsz2PR.w    = area->width;
      ovrsz2PR.h    = area->height;
      ovrsz2PR.data = ovrsz2_data + (ovrsz2PR.rowstride * ovrsz2PR.y) + (ovrsz2PR.bytes * ovrsz2PR.x);

      copy_region (&ovrsz2PR, &destPR);

      g_free(ovrsz1_data);
      g_free(ovrsz2_data);
      g_free(fillcolor);
    }

  /*  paste the newly painted canvas to the gimage which is being worked on  */
  gimp_paint_tool_replace_canvas (paint_tool, drawable, OPAQUE_OPACITY,
				  (gint) (gimp_context_get_opacity (NULL) * 255),
				  pressure_options->pressure ? PRESSURE : SOFT,
				  scale, INCREMENTAL);
}

static void
calculate_matrix (ConvolveType type,
		  gdouble      rate)
{
  gfloat percent;

  /*  find percent of tool pressure  */
  percent = MIN (rate / 100.0, 1.0);

  /*  get the appropriate convolution matrix and size and divisor  */
  switch (type)
    {
    case BLUR_CONVOLVE:
      matrix_size = 5;
      blur_matrix [12] = MIN_BLUR + percent * (MAX_BLUR - MIN_BLUR);
      copy_matrix (blur_matrix, custom_matrix, matrix_size);
      break;

    case SHARPEN_CONVOLVE:
      matrix_size = 5;
      sharpen_matrix [12] = MIN_SHARPEN + percent * (MAX_SHARPEN - MIN_SHARPEN);
      copy_matrix (sharpen_matrix, custom_matrix, matrix_size);
      break;

    case CUSTOM_CONVOLVE:
      matrix_size = 5;
      break;
    }

  integer_matrix (custom_matrix, matrix, matrix_size);
  matrix_divisor = sum_matrix (matrix, matrix_size);

  if (!matrix_divisor)
    matrix_divisor = 1;
}

static void
integer_matrix (gfloat *source,
		gint   *dest,
		gint    size)
{
  gint i;

#define PRECISION  10000

  for (i = 0; i < size*size; i++)
    *dest++ = (gint) (*source ++ * PRECISION);
}

static void
copy_matrix (gfloat *src,
	     gfloat *dest,
	     gint    size)
{
  gint i;

  for (i = 0; i < size*size; i++)
    *dest++ = *src++;
}

static gint
sum_matrix (gint *matrix,
	    gint  size)
{
  gint sum = 0;

  size *= size;

  while (size --)
    sum += *matrix++;

  return sum;
}

#if 0 /* Leave these to the STUBs */
static gpointer
convolve_non_gui_paint_func (GimpPaintTool    *paint_tool,
			     GimpDrawable *drawable,
			     PaintState    state)
{
  convolve_motion (paint_tool, drawable, &non_gui_pressure_options,
		   non_gui_type, non_gui_rate);

  return NULL;
}

gboolean
convolve_non_gui_default (GimpDrawable *drawable,
			  gint          num_strokes,
			  gdouble      *stroke_array)
{
  gdouble          rate    = DEFAULT_CONVOLVE_RATE;
  ConvolveType     type    = DEFAULT_CONVOLVE_TYPE;
  ConvolveOptions *options = convolve_options;

  if (options)
    {
      rate = options->rate;
      type = options->type;
    }

  return convolve_non_gui (drawable, rate, type, num_strokes, stroke_array);
}

gboolean
convolve_non_gui (GimpDrawable *drawable,
    		  gdouble       rate,
		  ConvolveType  type,
		  gint          num_strokes,
		  gdouble      *stroke_array)
{
  gint i;

  if (gimp_paint_tool_init (&non_gui_paint_core, drawable,
			    stroke_array[0], stroke_array[1]))
    {
      non_gui_type = type;
      non_gui_rate = rate;

      non_gui_paint_core.startx = non_gui_paint_core.lastx = stroke_array[0];
      non_gui_paint_core.starty = non_gui_paint_core.lasty = stroke_array[1];

      convolve_non_gui_paint_func (&non_gui_paint_core, drawable, 0);

      for (i = 1; i < num_strokes; i++)
	{
	  non_gui_paint_core.curx = stroke_array[i * 2 + 0];
	  non_gui_paint_core.cury = stroke_array[i * 2 + 1];

	  paint_core_interpolate (&non_gui_paint_core, drawable);

	  non_gui_paint_core.lastx = non_gui_paint_core.curx;
	  non_gui_paint_core.lasty = non_gui_paint_core.cury;
	}

      paint_core_finish (&non_gui_paint_core, drawable, -1);

      paint_core_cleanup ();

      return TRUE;
    }

  return FALSE;
}

#endif /* 0 - non-gui functions */

static ConvolveOptions *
convolve_options_new (void)
{
  ConvolveOptions *options;
  GtkWidget       *vbox;
  GtkWidget       *hbox;
  GtkWidget       *label;
  GtkWidget       *scale;
  GtkWidget       *frame;

  options = g_new0 (ConvolveOptions, 1);

  paint_options_init ((PaintOptions *) options,
		      GIMP_TYPE_CONVOLVE_TOOL,
		      convolve_options_reset);

  options->type = options->type_d = DEFAULT_CONVOLVE_TYPE;
  options->rate = options->rate_d = DEFAULT_CONVOLVE_RATE;

  /*  the main vbox  */
  vbox = ((ToolOptions *) options)->main_vbox;

  /*  the rate scale  */
  hbox = gtk_hbox_new (FALSE, 4);
  gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);

  label = gtk_label_new (_("Rate:"));
  gtk_misc_set_alignment (GTK_MISC (label), 1.0, 1.0);
  gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
  gtk_widget_show (label);

  options->rate_w =
    gtk_adjustment_new (options->rate_d, 0.0, 100.0, 1.0, 1.0, 0.0);
  scale = gtk_hscale_new (GTK_ADJUSTMENT (options->rate_w));
  gtk_box_pack_start (GTK_BOX (hbox), scale, TRUE, TRUE, 0);
  gtk_scale_set_value_pos (GTK_SCALE (scale), GTK_POS_TOP);
  gtk_range_set_update_policy (GTK_RANGE (scale), GTK_UPDATE_DELAYED);
  gtk_signal_connect (GTK_OBJECT (options->rate_w), "value_changed",
		      GTK_SIGNAL_FUNC (gimp_double_adjustment_update),
		      &options->rate);
  gtk_widget_show (scale);
  gtk_widget_show (hbox);

  frame = gimp_radio_group_new2 (TRUE, _("Convolve Type"),
				 gimp_radio_button_update,
				 &options->type, (gpointer) options->type,

				 _("Blur"), (gpointer) BLUR_CONVOLVE,
				 &options->type_w[0],
				 _("Sharpen"), (gpointer) SHARPEN_CONVOLVE,
				 &options->type_w[1],

				 NULL);

  gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
  gtk_widget_show (frame);

  return options;
}

static void
convolve_options_reset (ToolOptions *tool_options)
{
  ConvolveOptions *options;

  options = (ConvolveOptions *) tool_options;

  paint_options_reset (tool_options);

  gtk_adjustment_set_value (GTK_ADJUSTMENT (options->rate_w),
			    options->rate_d);
  gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (options->type_w[options->type_d]), TRUE);
}