sl@0: /* Copyright (c) 2009 The Khronos Group Inc.
sl@0:  *
sl@0:  * Permission is hereby granted, free of charge, to any person obtaining a
sl@0:  * copy of this software and/or associated documentation files (the
sl@0:  * "Materials"), to deal in the Materials without restriction, including
sl@0:  * without limitation the rights to use, copy, modify, merge, publish,
sl@0:  * distribute, sublicense, and/or sell copies of the Materials, and to
sl@0:  * permit persons to whom the Materials are furnished to do so, subject to
sl@0:  * the following conditions:
sl@0:  *
sl@0:  * The above copyright notice and this permission notice shall be included
sl@0:  * in all copies or substantial portions of the Materials.
sl@0:  *
sl@0:  * THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
sl@0:  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
sl@0:  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
sl@0:  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
sl@0:  * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
sl@0:  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
sl@0:  * MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
sl@0:  */
sl@0: 
sl@0: #ifndef OWFOBJECT_H_
sl@0: #define OWFOBJECT_H_
sl@0: 
sl@0: #include <stdlib.h>
sl@0: 
sl@0: #include "owftypes.h"
sl@0: #include "owfdebug.h"
sl@0: 
sl@0: 
sl@0: #ifdef __cplusplus
sl@0: extern "C"
sl@0: {
sl@0: #endif
sl@0: 
sl@0: 
sl@0: typedef void (*DESTRUCTOR)(void*);
sl@0: typedef void (*CONSTRUCTOR)(void*);
sl@0: 
sl@0: typedef struct {
sl@0:     const char*             type;
sl@0:     DESTRUCTOR              destructor;
sl@0:     OWFuint32               referenceCount;
sl@0:     void*                   payload;
sl@0: } OWF_OBJECT;
sl@0: 
sl@0: #define TYPE(x)             "" # x "_type"
sl@0: 
sl@0: /*! returns field offset within structure */
sl@0: #define FOFF(x,y)           ((OWFuint32) &(((x*) 0x1000)->y) - 0x1000)
sl@0: 
sl@0: /*! returns pointer to wrapper object which holds object x */
sl@0: #define _O(x)               ((OWF_OBJECT*) ((OWFuint32)(x) -\
sl@0:                                            FOFF(OWF_OBJECT,payload)))
sl@0: 
sl@0: /*! create new object instance */
sl@0: #define CREATE(x)           (x*) OWF_Object_Construct(sizeof(x), TYPE(x), \
sl@0:                                                       & x##_Ctor, & x##_Dtor)
sl@0: 
sl@0: #define REFCOUNT(x)         ((x) ? _O(x)->referenceCount : 0xFFFFFFFF)
sl@0: 
sl@0: /*! get the type of the contained object  */
sl@0: #define TYPEOF(x)           (_O(x)->type)
sl@0: 
sl@0: /*! increment object reference count  */
sl@0: #define ADDREF(x,y) \
sl@0:     if (y) {\
sl@0:          _O(y)->referenceCount++; \
sl@0:          DPRINT(("ADDREF: ref count of %s(%p) is now %d\n", TYPEOF(y), y, \
sl@0:                  REFCOUNT(y)));\
sl@0:     }\
sl@0:     x = y;
sl@0: 
sl@0: /*! decrement object reference count, call destructor if count reaches zero  */
sl@0: #define REMREF(x) \
sl@0:     if (x) {\
sl@0:         --_O(x)->referenceCount; \
sl@0:         DPRINT(("REMREF: ref count of %s(%p) is now %d\n", TYPEOF(x), x, \
sl@0:                 REFCOUNT(x))); \
sl@0:         if (0 == _O(x)->referenceCount) {\
sl@0:             if (_O(x)->destructor) {\
sl@0:                 _O(x)->destructor(x);\
sl@0:             }\
sl@0:             xfree(_O(x));\
sl@0:         }\
sl@0:         x = NULL;\
sl@0:     }
sl@0: 
sl@0: #define DESTROY(x) \
sl@0:     REMREF(x); \
sl@0:     x = NULL;
sl@0: 
sl@0: OWF_API_CALL void*
sl@0: OWF_Object_Construct(size_t size,
sl@0:                      const char* type,
sl@0:                      CONSTRUCTOR ctor,
sl@0:                      DESTRUCTOR dtor);
sl@0: 
sl@0: 
sl@0: #ifdef __cplusplus
sl@0: }
sl@0: #endif
sl@0: 
sl@0: 
sl@0: #endif /* OWFOBJECT_H_ */