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f-utils.h

/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* f-utils.h
 *
 * Copyright (C) 2003  Ettore Perazzoli
 *
 * 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.
 *
 * Author: Ettore Perazzoli <ettore@ximian.com>
 */

#ifndef F_UTILS_H
#define F_UTILS_H

#include <gdk-pixbuf/gdk-pixbuf.h>
#include <math.h>


#define F_MAKE_TYPE(name, underscore_name)                                          \
      GType                                                             \
      underscore_name##_get_type (void)                                       \
      {                                                                 \
            static GType type = 0;                                            \
                                                                        \
            if (type == 0) {                                            \
                  static const GTypeInfo info = {                                   \
                        sizeof (name##Class),                                 \
                        (GBaseInitFunc) NULL,                                 \
                        (GBaseFinalizeFunc) NULL,                             \
                        (GClassInitFunc) class_init,                          \
                        NULL,           /* class_finalize */                        \
                        NULL,           /* class_data */                      \
                        sizeof (name),                                        \
                        0,               /* n_preallocs */                    \
                        (GInstanceInitFunc) init,                             \
                  };                                                    \
                                                                        \
                  type = g_type_register_static (PARENT_TYPE, #name, &info, 0);           \
            }                                                           \
                                                                        \
            return type;                                                      \
      }
      
#define F_MAKE_TYPE_WITH_ERROR(name, underscore_name)                               \
      F_MAKE_TYPE (name, underscore_name)                                     \
      GQuark                                                                  \
      underscore_name##_error_quark (void)                                          \
      {                                                                 \
            static GQuark q = 0;                                              \
                                                                        \
            if (q == 0)                                                 \
                  q = g_quark_from_static_string (#underscore_name "_error_quark"); \
                                                                        \
            return q;                                                   \
      }


/* Refcounting macros.  Note that some of these evaluates OBJ multiple times,
   which is not ideal...  So you want to pass only variables (not functions) to
   them.  */

#define F_UNREF(obj)                      \
      G_STMT_START {                      \
            if ((obj) != NULL) {          \
                  g_object_unref (obj);   \
                  (obj) = NULL;           \
            }                       \
      } G_STMT_END

#define F_REF(obj)                              \
      ((obj) != NULL ? (g_object_ref (obj), (obj))    \
                   : NULL)

#define F_ASSIGN(dest, src)               \
      G_STMT_START {                      \
            F_UNREF(dest);                \
            (dest) = F_REF(src);          \
      } G_STMT_END

#define F_WEAK_NULL(dest)                                                     \
      G_STMT_START {                                                          \
            if ((dest) != NULL) {                                             \
                  g_object_remove_weak_pointer (G_OBJECT (dest), (void **) & (dest));     \
                  (dest) = NULL;                                              \
            }                                                           \
      } G_STMT_END

#define F_WEAK_ASSIGN(dest, src)                                              \
      G_STMT_START {                                                          \
            F_WEAK_NULL(dest);                                                \
            if ((src) != NULL) {                                              \
                  (dest) = (src);                                             \
                  g_object_add_weak_pointer (G_OBJECT (dest), (void **) & (dest));  \
            }                                                           \
      } G_STMT_END

#define F_BOOLEAN_MEMBER(name)                        \
      unsigned int name : 1

#define F_LIST_FOREACH(list, iterator)          \
      for ((iterator) = (list); (iterator) != NULL; (iterator) = (iterator)->next)

#define F_DOUBLE_EQUAL(a, b)              \
      (fabs (a - b) < 1e-6)


/* Build a relative path from START_PATH to DESTINATION_PATH.  */
char *f_build_relative_path (const char *start_path,
                       const char *destination_path);

#endif /* F_UTILS_H */

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