gi/pygi-foreign-api.h

   1 /* -*- Mode: C; c-basic-offset: 4 -*-
   2  * vim: tabstop=4 shiftwidth=4 expandtab
   3  *
   4  * Copyright (C) 2005-2009 Johan Dahlin <johan@gnome.org>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #ifndef __PYGI_FOREIGN_API_H__
  21 #define __PYGI_FOREIGN_API_H__
  22
  23 #include <girepository.h>
  24 #include <pygobject.h>
  25
  26 typedef PyObject * (*PyGIArgOverrideToGIArgumentFunc)   (PyObject        *value,
  27                                                          GIInterfaceInfo *interface_info,
  28                                                          GITransfer       transfer,
  29                                                          GIArgument      *arg);
  30 typedef PyObject * (*PyGIArgOverrideFromGIArgumentFunc) (GIInterfaceInfo *interface_info,
  31                                                          GITransfer       transfer,
  32                                                          gpointer         data);
  33 typedef PyObject * (*PyGIArgOverrideReleaseFunc)        (GITypeInfo *type_info,
  34                                                          gpointer  struct_);
  35
  36
  37 struct PyGI_API {
  38     void (*register_foreign_struct) (const char* namespace_,
  39                                      const char* name,
  40                                      PyGIArgOverrideToGIArgumentFunc to_func,
  41                                      PyGIArgOverrideFromGIArgumentFunc from_func,
  42                                      PyGIArgOverrideReleaseFunc release_func);
  43 };
  44
  45
  46 #ifndef _INSIDE_PYGOBJECT_
  47
  48 static struct PyGI_API *PyGI_API = NULL;
  49
  50 static int
  51 _pygi_import (void)
  52 {
  53     if (PyGI_API != NULL) {
  54         return 1;
  55     }
  56     PyGI_API = (struct PyGI_API*) PyCapsule_Import("gi._API", FALSE);
  57     if (PyGI_API == NULL) {
  58         return -1;
  59     }
  60
  61     return 0;
  62 }
  63
  64
  65 static inline PyObject *
  66 pygi_register_foreign_struct (const char* namespace_,
  67                               const char* name,
  68                               PyGIArgOverrideToGIArgumentFunc to_func,
  69                               PyGIArgOverrideFromGIArgumentFunc from_func,
  70                               PyGIArgOverrideReleaseFunc release_func)
  71 {
  72     if (_pygi_import() < 0) {
  73         return NULL;
  74     }
  75     PyGI_API->register_foreign_struct(namespace_,
  76                                       name,
  77                                       to_func,
  78                                       from_func,
  79                                       release_func);
  80     Py_RETURN_NONE;
  81 }
  82
  83 #endif /* _INSIDE_PYGOBJECT_ */
  84
  85 #endif /* __PYGI_FOREIGN_API_H__ */