/* GIMP - The GNU 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 <gegl.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 "gegl/gimpposterizeconfig.h"

/* temp */
#include "gimp.h"
#include "gimpimage.h"

#include "gimpdrawable.h"
#include "gimpdrawable-operation.h"
#include "gimpdrawable-posterize.h"

#include "gimp-intl.h"


/*  public functions  */

void
gimp_drawable_posterize (GimpDrawable *drawable,
                         GimpProgress *progress,
                         gint          levels)
{
  GimpPosterizeConfig *config;

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

  config = g_object_new (GIMP_TYPE_POSTERIZE_CONFIG,
                         "levels", levels,
                         NULL);

  if (gimp_use_gegl (GIMP_ITEM (drawable)->image->gimp))
    {
      GeglNode *node;

      node = g_object_new (GEGL_TYPE_NODE,
                           "operation", "gimp-posterize",
                           NULL);
      gegl_node_set (node,
                     "config", config,
                     NULL);

      gimp_drawable_apply_operation (drawable, node, TRUE,
                                     progress, _("Posterize"));

      g_object_unref (node);
    }
  else
    {
      gint x, y, width, height;

      /* The application should occur only within selection bounds */
      if (gimp_drawable_mask_intersect (drawable, &x, &y, &width, &height))
        {
          GimpLut     *lut;
          PixelRegion  srcPR, destPR;

          lut = posterize_lut_new (config->levels,
                                   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, _("Posterize"));
          gimp_drawable_update (drawable, x, y, width, height);
        }
    }

  g_object_unref (config);
}