/* This file is part of 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 Øyvind Kolås

 */

#include "config.h"

#include <glib/gi18n-lib.h>

#ifdef GEGL_CHANT_PROPERTIES

gegl_chant_double (x,      _("X"),      -G_MAXFLOAT, G_MAXFLOAT,  0.0, _("X"))

gegl_chant_double (y,      _("Y"),      -G_MAXFLOAT, G_MAXFLOAT,  0.0, _("Y"))

gegl_chant_double (width,  _("Width"),  -G_MAXFLOAT, G_MAXFLOAT, 10.0, _("Width"))

gegl_chant_double (height, _("Height"), -G_MAXFLOAT, G_MAXFLOAT, 10.0, _("Height"))

#else

#define GEGL_CHANT_TYPE_FILTER

#define GEGL_CHANT_C_FILE       "crop.c"

#include "gegl-chant.h"

#include "graph/gegl-node.h"

#include "buffer/gegl-buffer-cl-cache.h"

#include <math.h>

static GeglNode *

gegl_crop_detect (GeglOperation *operation,

                  gint           x,

                  gint           y)

{

  GeglChantO *o = GEGL_CHANT_PROPERTIES (operation);

  GeglNode   *input_node;

  input_node = gegl_operation_get_source_node (operation, "input");

  if (input_node)

    return gegl_operation_detect (input_node->operation,

                                  x - floor (o->x),

                                  y - floor (o->y));

  return operation->node;

}

static GeglRectangle

gegl_crop_get_bounding_box (GeglOperation *operation)

{

  GeglChantO    *o = GEGL_CHANT_PROPERTIES (operation);

  GeglRectangle *in_rect = gegl_operation_source_get_bounding_box (operation, "input");

  GeglRectangle  result  = { 0, 0, 0, 0 };

  if (!in_rect)

    return result;

  result.x = o->x;

  result.y = o->y;

  result.width  = o->width;

  result.height = o->height;

  return result;

}

static GeglRectangle

gegl_crop_get_invalidated_by_change (GeglOperation       *operation,

                                     const gchar         *input_pad,

                                     const GeglRectangle *input_region)

{

  GeglChantO   *o = GEGL_CHANT_PROPERTIES (operation);

  GeglRectangle result;

  result.x = o->x;

  result.y = o->y;

  result.width = o->width;

  result.height = o->height;

  gegl_rectangle_intersect (&result, &result, input_region);

  return result;

}

static GeglRectangle

gegl_crop_get_required_for_output (GeglOperation       *operation,

                                   const gchar         *input_pad,

                                   const GeglRectangle *roi)

{

  GeglChantO   *o = GEGL_CHANT_PROPERTIES (operation);

  GeglRectangle result;

  result.x = o->x;

  result.y = o->y;

  result.width = o->width;

  result.height = o->height;

  gegl_rectangle_intersect (&result, &result, roi);

  return result;

}

static gboolean

gegl_crop_process (GeglOperation        *operation,

                   GeglOperationContext *context,

                   const gchar          *output_prop,

                   const GeglRectangle  *result,

                   gint                  level)

{

  GeglChantO   *o = GEGL_CHANT_PROPERTIES (operation);

  GeglBuffer   *input;

  gboolean      success = FALSE;

  GeglRectangle extent;

  extent.x = o->x;

  extent.y = o->y;

  extent.width = o->width;

  extent.height = o->height;

  if (strcmp (output_prop, "output"))

    {

      g_warning ("requested processing of %s pad on a crop", output_prop);

      return FALSE;

    }

  input  = gegl_operation_context_get_source (context, "input");

  if (input != NULL)

    {

      GeglBuffer *output;

      output = gegl_buffer_create_sub_buffer (input, &extent);

      if (gegl_object_get_has_forked (input))

        gegl_object_set_has_forked (output);

      gegl_operation_context_take_object (context, "output", G_OBJECT (output));

      g_object_unref (input);

      success = TRUE;

    }

  else

    {

      if (!g_object_get_data (G_OBJECT (operation->node), "graph"))

        g_warning ("%s got %s",

                   gegl_node_get_debug_name (operation->node),

                   input==NULL?"input==NULL":"");

    }

  return success;

}

static void

gegl_chant_class_init (GeglChantClass *klass)

{

  GeglOperationClass *operation_class;

  operation_class = GEGL_OPERATION_CLASS (klass);

  operation_class->process                   = gegl_crop_process;

  operation_class->get_bounding_box          = gegl_crop_get_bounding_box;

  operation_class->detect                    = gegl_crop_detect;

  operation_class->get_invalidated_by_change = gegl_crop_get_invalidated_by_change;

  operation_class->get_required_for_output   = gegl_crop_get_required_for_output;

  gegl_operation_class_set_keys (operation_class,

      "name",        "gegl:crop",

      "categories",  "core",

      "description", _("Crop a buffer"),

      NULL);

  operation_class->no_cache = TRUE;

}

#endif