/* GStreamer Color Balance

 * Copyright (C) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>

 *

 * colorbalance.c: image color balance interface design

 *                 virtual class function wrappers

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Library General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library 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

 * Library General Public License for more details.

 *

 * You should have received a copy of the GNU Library General Public

 * License along with this library; if not, write to the

 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,

 * Boston, MA 02111-1307, USA.

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include "colorbalance.h"

#include "interfaces-marshal.h"

/**

 * SECTION:gstcolorbalance

 * @short_description: Interface for adjusting color balance settings

 */

enum

{

  VALUE_CHANGED,

  LAST_SIGNAL

};

static void gst_color_balance_class_init (GstColorBalanceClass * klass);

static guint gst_color_balance_signals[LAST_SIGNAL] = { 0 };

#ifdef __SYMBIAN32__

EXPORT_C

#endif

GType

gst_color_balance_get_type (void)

{

  static GType gst_color_balance_type = 0;

  if (!gst_color_balance_type) {

    static const GTypeInfo gst_color_balance_info = {

      sizeof (GstColorBalanceClass),

      (GBaseInitFunc) gst_color_balance_class_init,

      NULL,

      NULL,

      NULL,

      NULL,

      0,

      0,

      NULL,

    };

    gst_color_balance_type = g_type_register_static (G_TYPE_INTERFACE,

        "GstColorBalance", &gst_color_balance_info, 0);

    g_type_interface_add_prerequisite (gst_color_balance_type,

        GST_TYPE_IMPLEMENTS_INTERFACE);

  }

  return gst_color_balance_type;

}

static void

gst_color_balance_class_init (GstColorBalanceClass * klass)

{

  static gboolean initialized = FALSE;

  if (!initialized) {

    gst_color_balance_signals[VALUE_CHANGED] =

        g_signal_new ("value-changed",

        GST_TYPE_COLOR_BALANCE, G_SIGNAL_RUN_LAST,

        G_STRUCT_OFFSET (GstColorBalanceClass, value_changed),

        NULL, NULL,

        gst_interfaces_marshal_VOID__OBJECT_INT,

        G_TYPE_NONE, 2, GST_TYPE_COLOR_BALANCE_CHANNEL, G_TYPE_INT);

    initialized = TRUE;

  }

  klass->balance_type = GST_COLOR_BALANCE_SOFTWARE;

  /* default virtual functions */

  klass->list_channels = NULL;

  klass->set_value = NULL;

  klass->get_value = NULL;

}

#ifdef __SYMBIAN32__

EXPORT_C

#endif

const GList *

gst_color_balance_list_channels (GstColorBalance * balance)

{

  GstColorBalanceClass *klass = GST_COLOR_BALANCE_GET_CLASS (balance);

  if (klass->list_channels) {

    return klass->list_channels (balance);

  }

  return NULL;

}

#ifdef __SYMBIAN32__

EXPORT_C

#endif

void

gst_color_balance_set_value (GstColorBalance * balance,

    GstColorBalanceChannel * channel, gint value)

{

  GstColorBalanceClass *klass = GST_COLOR_BALANCE_GET_CLASS (balance);

  if (klass->set_value) {

    klass->set_value (balance, channel, value);

  }

}

#ifdef __SYMBIAN32__

EXPORT_C

#endif

gint

gst_color_balance_get_value (GstColorBalance * balance,

    GstColorBalanceChannel * channel)

{

  GstColorBalanceClass *klass = GST_COLOR_BALANCE_GET_CLASS (balance);

  if (klass->get_value) {

    return klass->get_value (balance, channel);

  }

  return channel->min_value;

}

EXPORT_C

#endif

void

gst_color_balance_value_changed (GstColorBalance * balance,

    GstColorBalanceChannel * channel, gint value)

{

  g_signal_emit (G_OBJECT (balance),

      gst_color_balance_signals[VALUE_CHANGED], 0, channel, value);

  g_signal_emit_by_name (G_OBJECT (channel), "value_changed", value);

}