wine/dlls/ddraw/ddcomimpl.h

59 lines
2.3 KiB
C

/* A few helpful macros for implementing COM objects.
*
* Copyright 2000 TransGaming Technologies Inc.
*
* This library 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 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#ifndef _DDCOMIMPL_H_
#define _DDCOMIMPL_H_
#include <stddef.h>
/* Generates the name for a vtable pointer for a given interface. */
/* The canonical name for a single interface is "lpVtbl". */
#define ICOM_VFIELD_MULTI_NAME2(iface) ITF_##iface
#define ICOM_VFIELD_MULTI_NAME(iface) ICOM_VFIELD_MULTI_NAME2(iface)
/* Declares a vtable pointer field in an implementation. */
#define ICOM_VFIELD_MULTI(iface) \
iface ICOM_VFIELD_MULTI_NAME(iface)
/* Returns the offset of a vtable pointer within an implementation object. */
#define ICOM_VFIELD_OFFSET(impltype, iface) \
offsetof(impltype, ICOM_VFIELD_MULTI_NAME(iface))
/* Given an interface pointer, returns the implementation pointer. */
#define ICOM_OBJECT(impltype, ifacename, ifaceptr) \
(impltype*)((ifaceptr) == NULL ? NULL \
: (char*)(ifaceptr) - ICOM_VFIELD_OFFSET(impltype,ifacename))
#define ICOM_THIS_FROM(impltype, ifacename, ifaceptr) \
impltype* This = ICOM_OBJECT(impltype, ifacename, ifaceptr)
/* Given an object and interface name, returns a pointer to that interface. */
#define ICOM_INTERFACE(implobj, iface) \
(implobj == NULL ? NULL :&((implobj)->ICOM_VFIELD_MULTI_NAME(iface)))
#define ICOM_INIT_INTERFACE(implobj, ifacename, vtblname) \
do { \
(implobj)->ICOM_VFIELD_MULTI_NAME(ifacename).lpVtbl = &(vtblname); \
} while (0)
#define COM_INTERFACE_CAST(impltype, ifnamefrom, ifnameto, ifaceptr) \
ICOM_INTERFACE(ICOM_OBJECT(impltype, ifnamefrom, ifaceptr), ifnameto)
#endif /* _DDCOMIMPL_H_ */