/* This file is an image processing operation for GEGL
 *
 * GEGL is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * GEGL 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with GEGL; if not, see <http://www.gnu.org/licenses/>.
 *
 * Copyright 2006, 2010 Øyvind Kolås <pippin@gimp.org>
 */

#include "config.h"
#include <glib/gi18n-lib.h>

#ifdef GEGL_CHANT_PROPERTIES

gegl_chant_double_ui (std_dev, _("Std. Dev."),
                      0.0, 500.0, 1.0, 0.0, 200.0, 1.5,
                      _("Standard deviation (spatial scale factor)"))

gegl_chant_double_ui (scale, _("Scale"),
                      0.0, 100.0, 1.0, 0.0, 100.0, 1.5,
                      _("Scale, strength of effect"))

#else

#define GEGL_CHANT_TYPE_META
#define GEGL_CHANT_C_FILE "unsharp-mask.c"

#include "gegl-chant.h"

static void
attach (GeglOperation *operation)
{
  GeglNode *gegl, *input, *output, *add, *multiply, *subtract, *blur;

  gegl = operation->node;

  input    = gegl_node_get_input_proxy (gegl, "input");
  output   = gegl_node_get_output_proxy (gegl, "output");
  add      = gegl_node_new_child (gegl, "operation", "gegl:add", NULL);
  multiply = gegl_node_new_child (gegl, "operation", "gegl:multiply", NULL);
  subtract = gegl_node_new_child (gegl, "operation", "gegl:subtract", NULL);
  blur     = gegl_node_new_child (gegl, "operation", "gegl:gaussian-blur",NULL);

  gegl_node_link_many (input, subtract, multiply, NULL);
  gegl_node_link (input, blur);
  gegl_node_link_many (multiply, add, output, NULL);

  gegl_node_connect_from (subtract, "aux",   blur,     "output");
  gegl_node_connect_from (add,      "aux",   input, "output");

  gegl_operation_meta_redirect (operation, "scale", multiply, "value");
  gegl_operation_meta_redirect (operation, "std-dev", blur, "std-dev-x");
  gegl_operation_meta_redirect (operation, "std-dev", blur, "std-dev-y");
}

static void
gegl_chant_class_init (GeglChantClass *klass)
{
  GeglOperationClass *operation_class;

  operation_class = GEGL_OPERATION_CLASS (klass);

  operation_class->attach = attach;

  gegl_operation_class_set_keys (operation_class,
    "name",        "gegl:unsharp-mask",
    "categories",  "meta:enhance",
    "description", _("The most widely used method for sharpening an image, "
                     "sharpens by adding false mach-bands around edges"),
    NULL);
}

#endif
