gimp/app/core/gimpdrawable-invert.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 <glib-object.h>

#include "core-types.h"

#include "base/gimplut.h"
#include "base/lut-funcs.h"
#include "base/pixel-processor.h"
#include "base/pixel-region.h"

#include "gimpdrawable.h"
#include "gimpdrawable-invert.h"

#include "gimp-intl.h"


void
gimp_drawable_invert (GimpDrawable *drawable)
{
  PixelRegion  srcPR, destPR;
  gint         x, y, width, height;
  GimpLut     *lut;

  g_return_if_fail (GIMP_IS_DRAWABLE (drawable));
  g_return_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)));

  if (! gimp_drawable_mask_intersect (drawable, &x, &y, &width, &height))
    return;

  lut = invert_lut_new (gimp_drawable_bytes (drawable));

  pixel_region_init (&srcPR, gimp_drawable_get_tiles (drawable),
                     x, y, width, height, FALSE);
  pixel_region_init (&destPR, gimp_drawable_get_shadow_tiles (drawable),
                     x, y, width, height, TRUE);

  pixel_regions_process_parallel ((PixelProcessorFunc) gimp_lut_process,
                                  lut, 2, &srcPR, &destPR);

  gimp_lut_free (lut);

  gimp_drawable_merge_shadow (drawable, TRUE, _("Invert"));

  gimp_drawable_update (drawable, x, y, width, height);
}