gimpchannel.c 42 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"

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#include <stdlib.h>
#include <string.h>
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#include <gtk/gtk.h>

#include "apptypes.h"

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#include "appenv.h"
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#include "boundary.h"
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#include "channel.h"
#include "drawable.h"
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#include "gdisplay.h"
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#include "gimpimage.h"
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#include "gimage_mask.h"
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#include "gimpsignal.h"
#include "gimppreviewcache.h"
#include "gimplut.h"
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#include "layer.h"
#include "paint_funcs.h"
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#include "parasitelist.h"
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#include "pixel_processor.h"
#include "pixel_region.h"
#include "lut_funcs.h"
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#include "temp_buf.h"
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#include "tile.h"
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#include "tile_manager.h"
#include "undo.h"
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#include "libgimp/gimpmath.h"

#include "libgimp/gimpintl.h"


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enum
{
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  REMOVED,
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  LAST_SIGNAL
};

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static void      gimp_channel_class_init (GimpChannelClass *klass);
static void      gimp_channel_init       (GimpChannel      *channel);
static void      gimp_channel_destroy    (GtkObject        *object);
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static TempBuf * channel_preview_private (Channel *channel,
					  gint     width,
					  gint     height);

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static guint channel_signals[LAST_SIGNAL] = { 0 };
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static GimpDrawableClass *parent_class = NULL;

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GtkType
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gimp_channel_get_type (void)
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{
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  static GtkType channel_type = 0;
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  if (!channel_type)
    {
      GtkTypeInfo channel_info =
      {
	"GimpChannel",
	sizeof (GimpChannel),
	sizeof (GimpChannelClass),
	(GtkClassInitFunc) gimp_channel_class_init,
	(GtkObjectInitFunc) gimp_channel_init,
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        /* reserved_1 */ NULL,
	/* reserved_2 */ NULL,
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	(GtkClassInitFunc) NULL,
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      };

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      channel_type = gtk_type_unique (GIMP_TYPE_DRAWABLE, &channel_info);
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    }

  return channel_type;
}

static void
gimp_channel_class_init (GimpChannelClass *class)
{
  GtkObjectClass *object_class;

  object_class = (GtkObjectClass*) class;
  parent_class = gtk_type_class (gimp_drawable_get_type ());

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  channel_signals[REMOVED] =
	  gimp_signal_new ("removed",
			   0, object_class->type, 0, gimp_sigtype_void);

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  gtk_object_class_add_signals (object_class, channel_signals, LAST_SIGNAL);

  object_class->destroy = gimp_channel_destroy;
}

static void
gimp_channel_init (GimpChannel *channel)
{
}
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/**************************/
/*  Function definitions  */
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/**************************/
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static void
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channel_validate (TileManager *tm,
		  Tile        *tile)
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{
  /*  Set the contents of the tile to empty  */
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  memset (tile_data_pointer (tile, 0, 0), 
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	  TRANSPARENT_OPACITY, tile_size (tile));
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}

Channel *
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channel_new (GimpImage    *gimage,
	     gint          width,
	     gint          height,
	     const gchar  *name,
	     gint          opacity,
	     const guchar *col)
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{
  Channel * channel;
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  gint i;
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  channel = gtk_type_new (gimp_channel_get_type ());
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  gimp_drawable_configure (GIMP_DRAWABLE (channel), 
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			   gimage, width, height, GRAY_GIMAGE, name);
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  /*  set the channel color and opacity  */
  for (i = 0; i < 3; i++)
    channel->col[i] = col[i];
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  channel->opacity     = opacity;
  channel->show_masked = TRUE;
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  /*  selection mask variables  */
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  channel->empty          = TRUE;
  channel->segs_in        = NULL;
  channel->segs_out       = NULL;
  channel->num_segs_in    = 0;
  channel->num_segs_out   = 0;
  channel->bounds_known   = TRUE;
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  channel->boundary_known = TRUE;
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  channel->x1             = 0;
  channel->y1             = 0;
  channel->x2             = width;
  channel->y2             = height;
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  return channel;
}

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Channel *
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channel_copy (const Channel *channel)
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{
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  gchar       *channel_name;
  Channel     *new_channel;
  PixelRegion  srcPR, destPR;
  gchar       *ext;
  gint         number;
  const gchar *name;
  gint         len;
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  /*  formulate the new channel name  */
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  name = drawable_get_name (GIMP_DRAWABLE (channel));
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  ext = strrchr (name, '#');
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  len = strlen (_("copy"));
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  if ((strlen (name) >= len &&
       strcmp (&name[strlen (name) - len], _("copy")) == 0) ||
      (ext && (number = atoi (ext + 1)) > 0 && 
       ((int)(log10 (number) + 1)) == strlen (ext + 1)))
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    /* don't have redundant "copy"s */
    channel_name = g_strdup (name);
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  else
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    channel_name = g_strdup_printf (_("%s copy"), name);
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  /*  allocate a new channel object  */
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  new_channel = channel_new (GIMP_DRAWABLE (channel)->gimage, 
			     GIMP_DRAWABLE (channel)->width, 
			     GIMP_DRAWABLE (channel)->height, 
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			     channel_name, channel->opacity, channel->col);
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  GIMP_DRAWABLE (new_channel)->visible = GIMP_DRAWABLE (channel)->visible;
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  new_channel->show_masked = channel->show_masked;

  /*  copy the contents across channels  */
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  pixel_region_init (&srcPR, GIMP_DRAWABLE (channel)->tiles, 0, 0, 
		     GIMP_DRAWABLE (channel)->width, 
		     GIMP_DRAWABLE (channel)->height, FALSE);
  pixel_region_init (&destPR, GIMP_DRAWABLE (new_channel)->tiles,
		     0, 0,
		     GIMP_DRAWABLE (channel)->width,
		     GIMP_DRAWABLE (channel)->height, TRUE);
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  copy_region (&srcPR, &destPR);

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  /* copy the parasites */
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  GIMP_DRAWABLE (new_channel)->parasites =
    parasite_list_copy (GIMP_DRAWABLE (channel)->parasites);
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  /*  free up the channel_name memory  */
  g_free (channel_name);

  return new_channel;
}

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void
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channel_set_name (Channel     *channel,
                  const gchar *name)
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{
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  gimp_drawable_set_name (GIMP_DRAWABLE (channel), name);
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}

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const gchar *
channel_get_name (const Channel *channel)
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{
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  return gimp_drawable_get_name (GIMP_DRAWABLE (channel));
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}

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void 
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channel_set_color (Channel      *channel,
		   const guchar *color)
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{
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  gint i;

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  if (color)
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    {
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      for (i = 0; i < 3; i++)
	channel->col[i] = color[i];
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    }
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}
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const guchar *
channel_get_color (const Channel *channel)
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{
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  return GIMP_CHANNEL (channel)->col;
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}
 
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gint
channel_get_opacity (const Channel *channel)
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{ 
  return channel->opacity;
}

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void 
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channel_set_opacity (Channel *channel,
		     gint     opacity)
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{
  if (opacity >=0 && opacity <= 100)
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    channel->opacity = (gint) (opacity * 255) / 100;
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}

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Channel *
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channel_get_ID (gint ID)
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{
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  GimpDrawable *drawable;
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  drawable = drawable_get_ID (ID);
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  if (drawable && GIMP_IS_CHANNEL (drawable)) 
    return GIMP_CHANNEL (drawable);
  else
    return NULL;
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}

void
channel_delete (Channel *channel)
{
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  /*  Channels are normally deleted by removing them from the associated
      image. The only case where channel_delete() is useful is if you want
      to remove a floating channel object that has not been added to an
      image yet. We use gtk_object_sink() for this reason here.
   */
  gtk_object_sink (GTK_OBJECT (channel));
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}

static void
gimp_channel_destroy (GtkObject *object)
{
  GimpChannel *channel;

  g_return_if_fail (object != NULL);
  g_return_if_fail (GIMP_IS_CHANNEL (object));

  channel = GIMP_CHANNEL (object);

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  /* free the segments?  */
  if (channel->segs_in)
    g_free (channel->segs_in);
  if (channel->segs_out)
    g_free (channel->segs_out);

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  if (GTK_OBJECT_CLASS (parent_class)->destroy)
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    GTK_OBJECT_CLASS (parent_class)->destroy (object);
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}

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/* The removed signal is sent out when the channel is no longer
 * associcated with an image.  It's needed because channels aren't
 * destroyed immediately, but kept around for undo purposes.  Connect
 * to the removed signal to update bits of UI that are tied to a
 * particular layer. */
void
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channel_removed (Channel *channel)
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{
  g_return_if_fail (channel != NULL);
  g_return_if_fail (GIMP_IS_CHANNEL (channel));

  gtk_signal_emit (GTK_OBJECT (channel), channel_signals[REMOVED]);
}

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void
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channel_scale (Channel *channel,
	       gint     new_width,
	       gint     new_height)
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{
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  PixelRegion  srcPR, destPR;
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  TileManager *new_tiles;

  if (new_width == 0 || new_height == 0)
    return;

  /*  Update the old channel position  */
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  drawable_update (GIMP_DRAWABLE (channel),
		   0, 0,
		   GIMP_DRAWABLE (channel)->width,
		   GIMP_DRAWABLE (channel)->height);
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  /*  Configure the pixel regions  */
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  pixel_region_init (&srcPR, GIMP_DRAWABLE (channel)->tiles,
		     0, 0,
		     GIMP_DRAWABLE (channel)->width,
		     GIMP_DRAWABLE (channel)->height, FALSE);
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  /*  Allocate the new channel, configure dest region  */
  new_tiles = tile_manager_new (new_width, new_height, 1);
  pixel_region_init (&destPR, new_tiles, 0, 0, new_width, new_height, TRUE);

  /*  Add an alpha channel  */
  scale_region (&srcPR, &destPR);

  /*  Push the channel on the undo stack  */
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  undo_push_channel_mod (GIMP_DRAWABLE (channel)->gimage, channel);
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  /*  Configure the new channel  */
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  GIMP_DRAWABLE (channel)->tiles = new_tiles;
  GIMP_DRAWABLE (channel)->width = new_width;
  GIMP_DRAWABLE (channel)->height = new_height;
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  /*  bounds are now unknown  */
  channel->bounds_known = FALSE;

  /*  Update the new channel position  */
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  drawable_update (GIMP_DRAWABLE (channel),
		   0, 0,
		   GIMP_DRAWABLE (channel)->width,
		   GIMP_DRAWABLE (channel)->height);
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}

void
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channel_resize (Channel *channel,
		gint     new_width,
		gint     new_height,
		gint     offx,
		gint     offy)
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{
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  PixelRegion  srcPR, destPR;
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  TileManager *new_tiles;
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  guchar       bg = 0;
  gint         clear;
  gint         w, h;
  gint         x1, y1, x2, y2;
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  if (!new_width || !new_height)
    return;

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  x1 = CLAMP (offx, 0, new_width);
  y1 = CLAMP (offy, 0, new_height);
  x2 = CLAMP ((offx + GIMP_DRAWABLE (channel)->width), 0, new_width);
  y2 = CLAMP ((offy + GIMP_DRAWABLE (channel)->height), 0, new_height);
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  w = x2 - x1;
  h = y2 - y1;

  if (offx > 0)
    {
      x1 = 0;
      x2 = offx;
    }
  else
    {
      x1 = -offx;
      x2 = 0;
    }

  if (offy > 0)
    {
      y1 = 0;
      y2 = offy;
    }
  else
    {
      y1 = -offy;
      y2 = 0;
    }

  /*  Update the old channel position  */
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  drawable_update (GIMP_DRAWABLE (channel),
		   0, 0,
		   GIMP_DRAWABLE (channel)->width,
		   GIMP_DRAWABLE (channel)->height);
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  /*  Configure the pixel regions  */
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  pixel_region_init (&srcPR, GIMP_DRAWABLE (channel)->tiles,
		     x1, y1, w, h, FALSE);
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  /*  Determine whether the new channel needs to be initially cleared  */
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  if ((new_width  > GIMP_DRAWABLE (channel)->width) ||
      (new_height > GIMP_DRAWABLE (channel)->height) ||
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      (x2 || y2))
    clear = TRUE;
  else
    clear = FALSE;

  /*  Allocate the new channel, configure dest region  */
  new_tiles = tile_manager_new (new_width, new_height, 1);

  /*  Set to black (empty--for selections)  */
  if (clear)
    {
      pixel_region_init (&destPR, new_tiles, 0, 0, new_width, new_height, TRUE);
      color_region (&destPR, &bg);
    }

  /*  copy from the old to the new  */
  pixel_region_init (&destPR, new_tiles, x2, y2, w, h, TRUE);
  if (w && h)
    copy_region (&srcPR, &destPR);

  /*  Push the channel on the undo stack  */
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  undo_push_channel_mod (GIMP_DRAWABLE (channel)->gimage, channel);
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  /*  Configure the new channel  */
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  GIMP_DRAWABLE (channel)->tiles  = new_tiles;
  GIMP_DRAWABLE (channel)->width  = new_width;
  GIMP_DRAWABLE (channel)->height = new_height;
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  /*  bounds are now unknown  */
  channel->bounds_known = FALSE;

  /*  update the new channel area  */
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  drawable_update (GIMP_DRAWABLE (channel),
		   0, 0,
		   GIMP_DRAWABLE (channel)->width,
		   GIMP_DRAWABLE (channel)->height);
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}

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void            
channel_update (Channel *channel)
{
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  drawable_update (GIMP_DRAWABLE (channel),
		   0, 0,
		   GIMP_DRAWABLE (channel)->width,
		   GIMP_DRAWABLE (channel)->height);
  gdisplays_flush ();
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}

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/**********************/
/*  access functions  */
/**********************/
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gboolean
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channel_toggle_visibility (Channel *channel)
{
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  GIMP_DRAWABLE (channel)->visible = !GIMP_DRAWABLE (channel)->visible;
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  return GIMP_DRAWABLE (channel)->visible;
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}

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TempBuf *
channel_preview (Channel *channel,
		 gint     width,
		 gint     height)
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{
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  /* Ok prime the cache with a large preview if the cache is invalid */
  if (! GIMP_DRAWABLE (channel)->preview_valid &&
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      width  <= PREVIEW_CACHE_PRIME_WIDTH      &&
      height <= PREVIEW_CACHE_PRIME_HEIGHT     &&
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      GIMP_DRAWABLE (channel)->gimage          &&
      GIMP_DRAWABLE (channel)->gimage->width  > PREVIEW_CACHE_PRIME_WIDTH   &&
      GIMP_DRAWABLE (channel)->gimage->height > PREVIEW_CACHE_PRIME_HEIGHT)
    {
      TempBuf * tb = channel_preview_private (channel,
					      PREVIEW_CACHE_PRIME_WIDTH,
					      PREVIEW_CACHE_PRIME_HEIGHT);
      
      /* Save the 2nd call */
      if (width  == PREVIEW_CACHE_PRIME_WIDTH &&
	  height == PREVIEW_CACHE_PRIME_HEIGHT)
	return tb;
    }

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  /* Second call - should NOT visit the tile cache... */
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  return channel_preview_private (channel, width, height);
}

static TempBuf *
channel_preview_private (Channel *channel,
			 gint     width,
			 gint     height)
{
  MaskBuf     *preview_buf;
  PixelRegion  srcPR;
  PixelRegion  destPR;
  gint         subsample;
  TempBuf     *ret_buf;
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  g_return_val_if_fail (channel != NULL, NULL);
  g_return_val_if_fail (GIMP_IS_CHANNEL (channel), NULL);
  
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  /*  The easy way  */
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  if (GIMP_DRAWABLE (channel)->preview_valid &&
      (ret_buf =
       gimp_preview_cache_get (& (GIMP_DRAWABLE (channel)->preview_cache),
			       width, height)))
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    {
      return ret_buf;
    }
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  /*  The hard way  */
  else
    {
      /*  calculate 'acceptable' subsample  */
      subsample = 1;
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      if (width < 1) width = 1;
      if (height < 1) height = 1;
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      while ((width  * (subsample + 1) * 2 < GIMP_DRAWABLE (channel)->width) &&
	     (height * (subsample + 1) * 2 < GIMP_DRAWABLE (channel)->height))
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	subsample = subsample + 1;

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      pixel_region_init (&srcPR, GIMP_DRAWABLE (channel)->tiles,
			 0, 0,
			 GIMP_DRAWABLE (channel)->width,
			 GIMP_DRAWABLE (channel)->height, FALSE);
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      preview_buf = mask_buf_new (width, height);
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      destPR.bytes     = 1;
      destPR.x         = 0;
      destPR.y         = 0;
      destPR.w         = width;
      destPR.h         = height;
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      destPR.rowstride = width;
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      destPR.data      = mask_buf_data (preview_buf);
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      subsample_region (&srcPR, &destPR, subsample);

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      if (!GIMP_DRAWABLE (channel)->preview_valid)
	gimp_preview_cache_invalidate (&(GIMP_DRAWABLE(channel)->preview_cache));

      GIMP_DRAWABLE (channel)->preview_valid = TRUE;
      gimp_preview_cache_add (&(GIMP_DRAWABLE (channel)->preview_cache),
			      preview_buf);
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      return preview_buf;
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    }
}

void
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channel_invalidate_previews (GimpImage *gimage)
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{
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  GSList  *tmp;
  Channel *channel;
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  g_return_if_fail (gimage != NULL);

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  tmp = gimage->channels;
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  while (tmp)
    {
      channel = (Channel *) tmp->data;
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      gimp_drawable_invalidate_preview (GIMP_DRAWABLE (channel), TRUE);
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      tmp = g_slist_next (tmp);
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    }
}

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Tattoo
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channel_get_tattoo (const Channel *channel)
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{
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  return gimp_drawable_get_tattoo (GIMP_DRAWABLE (channel));
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}

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void
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channel_set_tattoo (Channel *channel, 
		    Tattoo   value)
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{
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  gimp_drawable_set_tattoo (GIMP_DRAWABLE (channel), value);
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}

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/******************************/
/*  selection mask functions  */
/******************************/
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Channel *
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channel_new_mask (GimpImage *gimage,
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		  gint       width,
		  gint       height)
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{
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  guchar   black[3] = { 0, 0, 0 };
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  Channel *new_channel;

  /*  Create the new channel  */
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  new_channel = channel_new (gimage, width, height,
			     _("Selection Mask"), 127, black);
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  /*  Set the validate procedure  */
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  tile_manager_set_validate_proc (GIMP_DRAWABLE (new_channel)->tiles,
				  channel_validate);
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  return new_channel;
}

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gboolean
channel_boundary (Channel   *mask,
		  BoundSeg **segs_in,
		  BoundSeg **segs_out,
		  gint      *num_segs_in,
		  gint      *num_segs_out,
		  gint       x1,
		  gint       y1,
		  gint       x2,
		  gint       y2)
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{
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  gint        x3, y3, x4, y4;
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  PixelRegion bPR;

  if (! mask->boundary_known)
    {
      /* free the out of date boundary segments */
      if (mask->segs_in)
	g_free (mask->segs_in);
      if (mask->segs_out)
	g_free (mask->segs_out);

      if (channel_bounds (mask, &x3, &y3, &x4, &y4))
	{
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	  pixel_region_init (&bPR, GIMP_DRAWABLE (mask)->tiles,
			     x3, y3, (x4 - x3), (y4 - y3), FALSE);
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	  mask->segs_out = find_mask_boundary (&bPR, &mask->num_segs_out,
					       IgnoreBounds,
					       x1, y1,
					       x2, y2);
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	  x1 = MAX (x1, x3);
	  y1 = MAX (y1, y3);
	  x2 = MIN (x2, x4);
	  y2 = MIN (y2, y4);
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	  if (x2 > x1 && y2 > y1)
	    {
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	      pixel_region_init (&bPR, GIMP_DRAWABLE (mask)->tiles,
				 0, 0,
				 GIMP_DRAWABLE (mask)->width,
				 GIMP_DRAWABLE (mask)->height, FALSE);
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	      mask->segs_in =  find_mask_boundary (&bPR, &mask->num_segs_in,
						   WithinBounds,
						   x1, y1,
						   x2, y2);
	    }
	  else
	    {
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	      mask->segs_in     = NULL;
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	      mask->num_segs_in = 0;
	    }
	}
      else
	{
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	  mask->segs_in      = NULL;
	  mask->segs_out     = NULL;
	  mask->num_segs_in  = 0;
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	  mask->num_segs_out = 0;
	}
      mask->boundary_known = TRUE;
    }

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  *segs_in      = mask->segs_in;
  *segs_out     = mask->segs_out;
  *num_segs_in  = mask->num_segs_in;
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  *num_segs_out = mask->num_segs_out;

  return TRUE;
}

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gint
channel_value (Channel *mask,
	       gint     x,
	       gint     y)
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{
  Tile *tile;
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  gint  val;
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  /*  Some checks to cut back on unnecessary work  */
  if (mask->bounds_known)
    {
      if (mask->empty)
	return 0;
      else if (x < mask->x1 || x >= mask->x2 || y < mask->y1 || y >= mask->y2)
	return 0;
    }
  else
    {
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      if (x < 0 || x >= GIMP_DRAWABLE (mask)->width ||
	  y < 0 || y >= GIMP_DRAWABLE (mask)->height)
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	return 0;
    }

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  tile = tile_manager_get_tile (GIMP_DRAWABLE (mask)->tiles, x, y, TRUE, FALSE);
  val = *(guchar *) (tile_data_pointer (tile, x % TILE_WIDTH, y % TILE_HEIGHT));
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  tile_release (tile, FALSE);
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  return val;
}

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gboolean
channel_bounds (Channel *mask,
		gint    *x1,
		gint    *y1,
		gint    *x2,
		gint    *y2)
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{
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  PixelRegion  maskPR;
  guchar      *data, *data1;
  gint         x, y;
  gint         ex, ey;
  gint         tx1, tx2, ty1, ty2;
  gint         minx, maxx;
  gpointer     pr;
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  /*  if the mask's bounds have already been reliably calculated...  */
  if (mask->bounds_known)
    {
      *x1 = mask->x1;
      *y1 = mask->y1;
      *x2 = mask->x2;
      *y2 = mask->y2;

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      return !mask->empty;
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    }

  /*  go through and calculate the bounds  */
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  tx1 = GIMP_DRAWABLE (mask)->width;
  ty1 = GIMP_DRAWABLE (mask)->height;
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  tx2 = 0;
  ty2 = 0;
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  pixel_region_init (&maskPR, GIMP_DRAWABLE (mask)->tiles,
		     0, 0,
		     GIMP_DRAWABLE (mask)->width,
		     GIMP_DRAWABLE (mask)->height, FALSE);
  for (pr = pixel_regions_register (1, &maskPR);
       pr != NULL;
       pr = pixel_regions_process (pr))
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    {
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      data1 = data = maskPR.data;
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      ex = maskPR.x + maskPR.w;
      ey = maskPR.y + maskPR.h;
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      /* only check the pixels if this tile is not fully within the currently
	 computed bounds */
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      if (maskPR.x < tx1 || ex > tx2 ||
	  maskPR.y < ty1 || ey > ty2)
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        {
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	  /* Check upper left and lower right corners to see if we can
	     avoid checking the rest of the pixels in this tile */
	  if (data[0] && data[maskPR.rowstride*(maskPR.h - 1) + maskPR.w - 1])
	  {
	    if (maskPR.x < tx1)
	      tx1 = maskPR.x;
	    if (ex > tx2)
	      tx2 = ex;
	    if (maskPR.y < ty1)
	      ty1 = maskPR.y;
	    if (ey > ty2)
	      ty2 = ey;
	  }
	  else
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	    for (y = maskPR.y; y < ey; y++, data1 += maskPR.rowstride)
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	    {
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	      for (x = maskPR.x, data = data1; x < ex; x++, data++)
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		if (*data)
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		{
		  minx = x;
		  maxx = x;
		  for (; x < ex; x++, data++)
		    if (*data)
		      maxx = x;
		  if (minx < tx1)
		    tx1 = minx;
		  if (maxx > tx2)
		    tx2 = maxx;
		  if (y < ty1)
		    ty1 = y;
		  if (y > ty2)
		    ty2 = y;
	      }
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	    }
	}
    }

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  tx2 = CLAMP (tx2 + 1, 0, GIMP_DRAWABLE (mask)->width);
  ty2 = CLAMP (ty2 + 1, 0, GIMP_DRAWABLE (mask)->height);
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  if (tx1 == GIMP_DRAWABLE (mask)->width && ty1 == GIMP_DRAWABLE (mask)->height)
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    {
      mask->empty = TRUE;
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      mask->x1    = 0;
      mask->y1    = 0;
      mask->x2    = GIMP_DRAWABLE (mask)->width;
      mask->y2    = GIMP_DRAWABLE (mask)->height;
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    }
  else
    {
      mask->empty = FALSE;
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      mask->x1    = tx1;
      mask->y1    = ty1;
      mask->x2    = tx2;
      mask->y2    = ty2;
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    }
  mask->bounds_known = TRUE;

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  *x1 = tx1;
  *x2 = tx2;
  *y1 = ty1;
  *y2 = ty2;

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  return !mask->empty;
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}

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gboolean
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channel_is_empty (Channel *mask)
{
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  PixelRegion  maskPR;
  guchar      *data;
  gint         x, y;
  gpointer     pr;
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  if (mask->bounds_known)
    return mask->empty;

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  pixel_region_init (&maskPR, GIMP_DRAWABLE (mask)->tiles,
		     0, 0,
		     GIMP_DRAWABLE (mask)->width,
		     GIMP_DRAWABLE (mask)->height, FALSE);
  for (pr = pixel_regions_register (1, &maskPR);
       pr != NULL;
       pr = pixel_regions_process (pr))
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    {
      /*  check if any pixel in the mask is non-zero  */
      data = maskPR.data;
      for (y = 0; y < maskPR.h; y++)
	for (x = 0; x < maskPR.w; x++)
	  if (*data++)
	    {
	      pixel_regions_process_stop (pr);
	      return FALSE;
	    }
    }

  /*  The mask is empty, meaning we can set the bounds as known  */
  if (mask->segs_in)
    g_free (mask->segs_in);
  if (mask->segs_out)
    g_free (mask->segs_out);

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  mask->empty          = TRUE;
  mask->segs_in        = NULL;
  mask->segs_out       = NULL;
  mask->num_segs_in    = 0;
  mask->num_segs_out   = 0;
  mask->bounds_known   = TRUE;
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  mask->boundary_known = TRUE;
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  mask->x1             = 0;
  mask->y1             = 0;
  mask->x2             = GIMP_DRAWABLE (mask)->width;
  mask->y2             = GIMP_DRAWABLE (mask)->height;
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  return TRUE;
}

void
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channel_add_segment (Channel *mask,
		     gint     x,
		     gint     y,
		     gint     width,
		     gint     value)
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{
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  PixelRegion  maskPR;
  guchar      *data;
  gint         val;
  gint         x2;
  gpointer     pr;
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  /*  check horizontal extents...  */
  x2 = x + width;
  if (x2 < 0) x2 = 0;
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  if (x2 > GIMP_DRAWABLE (mask)->width) x2 = GIMP_DRAWABLE (mask)->width;
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  if (x < 0) x = 0;
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  if (x > GIMP_DRAWABLE (mask)->width) x = GIMP_DRAWABLE (mask)->width;
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  width = x2 - x;
  if (!width) return;

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  if (y < 0 || y > GIMP_DRAWABLE (mask)->height)
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    return;

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  pixel_region_init (&maskPR, GIMP_DRAWABLE (mask)->tiles,
		     x, y, width, 1, TRUE);
  for (pr = pixel_regions_register (1, &maskPR);
       pr != NULL;
       pr = pixel_regions_process (pr))
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    {
      data = maskPR.data;
      width = maskPR.w;
      while (width--)
	{
	  val = *data + value;
	  if (val > 255)
	    val = 255;
	  *data++ = val;
	}
    }
}

void
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channel_sub_segment (Channel *mask,
		     gint     x,
		     gint     y,
		     gint     width,
		     gint     value)
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{
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  PixelRegion  maskPR;
  guchar      *data;
  gint         val;
  gint         x2;
  gpointer     pr;
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  /*  check horizontal extents...  */
  x2 = x + width;
  if (x2 < 0) x2 = 0;
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  if (x2 > GIMP_DRAWABLE (mask)->width) x2 = GIMP_DRAWABLE (mask)->width;
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  if (x < 0) x = 0;
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  if (x > GIMP_DRAWABLE (mask)->width) x = GIMP_DRAWABLE (mask)->width;
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  width = x2 - x;
  if (!width) return;

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  if (y < 0 || y > GIMP_DRAWABLE (mask)->height)
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    return;

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  pixel_region_init (&maskPR, GIMP_DRAWABLE (mask)->tiles, x, y, width, 1, TRUE);
  for (pr = pixel_regions_register (1, &maskPR);
       pr != NULL;
       pr = pixel_regions_process (pr))
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    {
      data = maskPR.data;
      width = maskPR.w;
      while (width--)
	{
	  val = *data - value;
	  if (val < 0)
	    val = 0;
	  *data++ = val;
	}
    }
}

void
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channel_combine_rect (Channel    *mask,
		      ChannelOps  op,
		      gint        x,
		      gint        y,
		      gint        w,
		      gint        h)
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{
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  gint        x2, y2;
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  PixelRegion maskPR;
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  guchar      color;
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  y2 = y + h;
  x2 = x + w;
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  x  = CLAMP (x,  0, GIMP_DRAWABLE (mask)->width);
  y  = CLAMP (y,  0, GIMP_DRAWABLE (mask)->height);
  x2 = CLAMP (x2, 0, GIMP_DRAWABLE (mask)->width);
  y2 = CLAMP (y2, 0, GIMP_DRAWABLE (mask)->height);
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