/* 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-object.h>

#include <string.h>

#include "gegl.h"

#include "gegl-types-internal.h"

#include "gegl-operation-composer.h"

#include "gegl-utils.h"

#include "graph/gegl-node.h"

#include "graph/gegl-connection.h"

#include "graph/gegl-pad.h"

#include "buffer/gegl-region.h"

#include "buffer/gegl-buffer.h"

enum

{

  PROP_0,

  PROP_OUTPUT,

  PROP_INPUT,

  PROP_AUX

};

static void     get_property (GObject             *gobject,

                              guint                prop_id,

                              GValue              *value,

                              GParamSpec          *pspec);

static void     set_property (GObject             *gobject,

                              guint                prop_id,

                              const GValue        *value,

                              GParamSpec          *pspec);

static gboolean gegl_operation_composer_process (GeglOperation       *operation,

                              GeglOperationContext     *context,

                              const gchar         *output_prop,

                              const GeglRectangle *result,

                              gint                 level);

static void     attach       (GeglOperation       *operation);

static GeglNode*detect       (GeglOperation       *operation,

                              gint                 x,

                              gint                 y);

static GeglRectangle get_bounding_box        (GeglOperation        *self);

static GeglRectangle get_required_for_output (GeglOperation        *self,

                                               const gchar         *input_pad,

                                               const GeglRectangle *roi);

G_DEFINE_TYPE (GeglOperationComposer, gegl_operation_composer,

               GEGL_TYPE_OPERATION)

static void

gegl_operation_composer_class_init (GeglOperationComposerClass * klass)

{

  GObjectClass       *object_class    = G_OBJECT_CLASS (klass);

  GeglOperationClass *operation_class = GEGL_OPERATION_CLASS (klass);

  object_class->set_property = set_property;

  object_class->get_property = get_property;

  operation_class->process = gegl_operation_composer_process;

  operation_class->attach = attach;

  operation_class->detect = detect;

  operation_class->get_bounding_box = get_bounding_box;

  operation_class->get_required_for_output = get_required_for_output;

  g_object_class_install_property (object_class, PROP_OUTPUT,

                                   g_param_spec_object ("output",

                                                        "Output",

                                                        "Output pad for generated image buffer.",

                                                        GEGL_TYPE_BUFFER,

                                                        G_PARAM_READABLE |

                                                        GEGL_PARAM_PAD_OUTPUT));

  g_object_class_install_property (object_class, PROP_INPUT,

                                   g_param_spec_object ("input",

                                                        "Input",

                                                        "Input pad, for image buffer input.",

                                                        GEGL_TYPE_BUFFER,

                                                        G_PARAM_READWRITE |

                                                        GEGL_PARAM_PAD_INPUT));

  g_object_class_install_property (object_class, PROP_AUX,

                                   g_param_spec_object ("aux",

                                                        "Input",

                                                        "Auxiliary image buffer input pad.",

                                                        GEGL_TYPE_BUFFER,

                                                        G_PARAM_READWRITE |

                                                        GEGL_PARAM_PAD_INPUT));

}

static void

gegl_operation_composer_init (GeglOperationComposer *self)

{

}

static void

attach (GeglOperation *self)

{

  GeglOperation *operation    = GEGL_OPERATION (self);

  GObjectClass  *object_class = G_OBJECT_GET_CLASS (self);

  gegl_operation_create_pad (operation,

                             g_object_class_find_property (object_class,

                                                           "output"));

  gegl_operation_create_pad (operation,

                             g_object_class_find_property (object_class,

                                                           "input"));

  gegl_operation_create_pad (operation,

                             g_object_class_find_property (object_class,

                                                           "aux"));

}

static void

get_property (GObject    *object,

              guint       prop_id,

              GValue     *value,

              GParamSpec *pspec)

{

}

static void

set_property (GObject      *object,

              guint         prop_id,

              const GValue *value,

              GParamSpec   *pspec)

{

}

static gboolean

gegl_operation_composer_process (GeglOperation        *operation,

                                 GeglOperationContext *context,

                                 const gchar          *output_prop,

                                 const GeglRectangle  *result,

                                 gint                  level)

{

  GeglOperationComposerClass *klass   = GEGL_OPERATION_COMPOSER_GET_CLASS (operation);

  GeglBuffer                 *input;

  GeglBuffer                 *aux;

  GeglBuffer                 *output;

  gboolean                    success = FALSE;

  if (strcmp (output_prop, "output"))

    {

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

      return FALSE;

    }

  input = gegl_operation_context_get_source (context, "input");

  aux   = gegl_operation_context_get_source (context, "aux");

  output = gegl_operation_context_get_target (context, "output");

  /* A composer with a NULL aux, can still be valid, the

   * subclass has to handle it.

   */

  if (input != NULL ||

      aux != NULL)

    {

      success = klass->process (operation, input, aux, output, result, level);

      if (output == GEGL_BUFFER (operation->node->cache))

        gegl_cache_computed (operation->node->cache, result);

      if (input)

        g_object_unref (input);

      if (aux)

        g_object_unref (aux);

    }

  else

    {

      g_warning ("%s received NULL input and aux",

                 gegl_node_get_debug_name (operation->node));

    }

  return success;

}

static GeglRectangle

get_bounding_box (GeglOperation *self)

{

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

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

  GeglRectangle *aux_rect = gegl_operation_source_get_bounding_box (self, "aux");

  if (!in_rect)

    {

      if (aux_rect)

        return *aux_rect;

      return result;

    }

  if (aux_rect)

    {

      gegl_rectangle_bounding_box (&result, in_rect, aux_rect);

    }

  else

    {

      return *in_rect;

    }

  return result;

}

static GeglRectangle

get_required_for_output (GeglOperation        *self,

                         const gchar         *input_pad,

                         const GeglRectangle *roi)

{

  return *roi;

}

static GeglNode *

detect (GeglOperation *operation,

        gint           x,

        gint           y)

{

  GeglNode *input_node = gegl_operation_get_source_node (operation, "input");

  GeglNode *aux_node   = gegl_operation_get_source_node (operation, "aux");

  if (input_node)

    input_node = gegl_node_detect (input_node, x, y);

  if (aux_node)

    aux_node = gegl_node_detect (aux_node, x, y);

  if (aux_node)

    return aux_node;

  if (input_node)

    return input_node;

  return NULL;

}