source: trunk/src/quartz/iunk.h@ 8533

/*
 * An implementation of IUnknown.
 *
 * hidenori@a2.ctktv.ne.jp
 */

#ifndef WINE_DSHOW_IUNK_H
#define WINE_DSHOW_IUNK_H

/*
        To avoid implementing IUnknown for all interfaces,

  1) To give a method to get rel-offset of IUnknown.
  2) The IUnknown knows all IIDs and offsets of interfaces.

    So each implementation must have following two members
    with the following order:

  typedef struct IDispatchImpl
  {
    ICOM_VFIELD(IDispatch);     <-pointer of the interface.
    size_t      ofsIUnknown;    <-ofs<IDispatchImpl> - ofs<QUARTZ_IUnkImpl>
  };

 */

/* for InterlockedExchangeAdd. */
#include <pshpack4.h>

typedef struct QUARTZ_IFEntry
{
        const IID*      piid;           /* interface ID. */
        size_t          ofsVTPtr;       /* offset from IUnknown. */
} QUARTZ_IFEntry;

typedef struct QUARTZ_IFDelegation
{
        struct QUARTZ_IFDelegation*     pNext;
        HRESULT (*pOnQueryInterface)(
                IUnknown* punk, const IID* piid, void** ppobj );
} QUARTZ_IFDelegation;

typedef struct QUARTZ_IUnkImpl
{
        /* pointer of IUnknown interface. */
        ICOM_VFIELD(IUnknown);

        /* array of supported IIDs and offsets. */
        const QUARTZ_IFEntry*   pEntries;
        DWORD   dwEntries;
        /* list of delegation handlers. */
        QUARTZ_IFDelegation*    pDelegationFirst;
        /* called on final release. */
        void (*pOnFinalRelease)(IUnknown* punk);

        /* IUnknown fields. */
        LONG    ref;
        IUnknown*       punkControl;
} QUARTZ_IUnkImpl;

#include <poppack.h>


void QUARTZ_IUnkInit( QUARTZ_IUnkImpl* pImpl, IUnknown* punkOuter );
void QUARTZ_IUnkAddDelegation(
        QUARTZ_IUnkImpl* pImpl, QUARTZ_IFDelegation* pDelegation );


#endif  /* WINE_DSHOW_IUNK_H */