multibufst.h

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    }									\
}

#define UNWRAP_SCREEN_FUNC(pSCREEN,pPRIV,DATA_TYPE,FUNC_NAME)		\
{									\
    SWAP_FUNC_VECTOR(pSCREEN,pPRIV,DATA_TYPE,FUNC_NAME);		\
    pPRIV->funcsWrapped &= ~(FUNC_NAME##Mask);				\
}

#define REWRAP_SCREEN_FUNC(pSCREEN,pPRIV,DATA_TYPE,FUNC_NAME)		\
{									\
    if (MB_SCREEN_PRIV(pSCREEN)->mbufWindowCount)			\
    {									\
	SWAP_FUNC_VECTOR(pSCREEN,pPRIV,DATA_TYPE,FUNC_NAME);		\
	pPRIV->funcsWrapped |= FUNC_NAME##Mask;				\
    }									\
}
#else
#define WRAP_SCREEN_FUNC(pSCREEN,pPRIV,FUNC_NAME, PRIV_FUNC_NAME)	\
{									\
    if ((pPRIV->funcsWrapped & FUNC_NAME/**/Mask) == 0)			\
    {									\
	pPRIV->FUNC_NAME   = pSCREEN->FUNC_NAME;			\
	pSCREEN->FUNC_NAME = PRIV_FUNC_NAME;				\
	pPRIV->funcsWrapped |= FUNC_NAME/**/Mask;			\
    }									\
}

#define UNWRAP_SCREEN_FUNC(pSCREEN,pPRIV,DATA_TYPE,FUNC_NAME)		\
{									\
    SWAP_FUNC_VECTOR(pSCREEN,pPRIV,DATA_TYPE,FUNC_NAME);		\
    pPRIV->funcsWrapped &= ~(FUNC_NAME/**/Mask);			\
}

#define REWRAP_SCREEN_FUNC(pSCREEN,pPRIV,DATA_TYPE,FUNC_NAME)		\
{									\
    if (MB_SCREEN_PRIV(pSCREEN)->mbufWindowCount)			\
    {									\
	SWAP_FUNC_VECTOR(pSCREEN,pPRIV,DATA_TYPE,FUNC_NAME);		\
	pPRIV->funcsWrapped |= FUNC_NAME/**/Mask;			\
    }									\
}
#endif

/* The _Multibuffer and _Multibuffers structures below refer to each other,
 * so we need this forward declaration
 */
typedef struct _Multibuffers	*MultibuffersPtr;

/*
 * per-Multibuffer data
 */
 
typedef struct _Multibuffer {
    MultibuffersPtr pMultibuffers;  /* associated window data */
    Mask	    eventMask;	    /* MultibufferClobberNotifyMask|ExposureMask|MultibufferUpdateNotifyMask */
    Mask	    otherEventMask; /* mask of all other clients event masks */
    OtherClients    *otherClients;  /* other clients that want events */
    int		    number;	    /* index of this buffer into array */
    int		    side;	    /* always Mono */
    int		    clobber;	    /* Unclobbered, PartiallyClobbered, FullClobbered */
    PixmapPtr	    pPixmap;	    /* associated pixmap */
} MultibufferRec, *MultibufferPtr;

/*
 * per-window data
 */

typedef struct _Multibuffers {
    WindowPtr	pWindow;		/* associated window */
    int		numMultibuffer;		/* count of buffers */
    int		refcnt;			/* ref count for delete */
    int		displayedMultibuffer;	/* currently active buffer */
    int		updateAction;		/* Undefined, Background, Untouched, Copied */
    int		updateHint;		/* Frequent, Intermittent, Static */
    int		windowMode;		/* always Mono */

    TimeStamp	lastUpdate;		/* time of last update */

    unsigned short	width, height;	/* last known window size */
    short		x, y;		/* for static gravity */

    MultibufferPtr	buffers;        /* array of numMultibuffer buffers */
} MultibuffersRec;

/*
 * per-screen data
 */
typedef struct _MultibufferScreen {
    PositionWindowProcPtr PositionWindow;		/* pWin, x,y */
} MultibufferScreenRec, *MultibufferScreenPtr;

/*
 * per display-image-buffers request data.
 */

typedef struct _DisplayRequest {
    struct _DisplayRequest	*next;
    TimeStamp			activateTime;
    ClientPtr			pClient;
    XID				id;
} DisplayRequestRec, *DisplayRequestPtr;

#define DestroyWindowMask		(1L<<0)
#define PositionWindowMask		(1L<<1)
#define PostValidateTreeMask		(1L<<2)
#define ClipNotifyMask			(1L<<3)
#define WindowExposuresMask		(1L<<4)
#define CopyWindowMask			(1L<<5)
#define ClearToBackgroundMask		(1L<<6)
#define ChangeWindowAttributesMask	(1L<<7)    

extern int		MultibufferScreenIndex;
extern int		MultibufferWindowIndex;

extern RESTYPE		MultibufferDrawableResType;

extern void		MultibufferUpdate(	/* pMbuffer, time */
#if NeedFunctionPrototypes
				MultibufferPtr /* pMultibuffer */,
				CARD32 /* time */
#endif
				);
extern void		MultibufferExpose(	/* pMbuffer, pRegion */
#if NeedFunctionPrototypes
				MultibufferPtr /* pMultibuffer */,
				RegionPtr /* pRegion */
#endif
				);
extern void		MultibufferClobber(	/* pMbuffer */
#if NeedFunctionPrototypes
				MultibufferPtr /* pMultibuffer */
#endif
				);

typedef struct _mbufWindow	*mbufWindowPtr;

/*
 * per-buffer data
 */

#define MB_DISPLAYED_BUFFER(pMBWindow) \
    ((pMBWindow)->buffers + (pMBWindow)->displayedMultibuffer)
 
typedef struct _mbufBuffer {
    mbufWindowPtr   pMBWindow;	    /* associated window data */
    Mask	    eventMask;	    /* client event mask */
    Mask	    otherEventMask; /* union of other clients' event masks */
    OtherClientsPtr otherClients;   /* other clients that want events */
    int		    number;	    /* index of this buffer into array */
    int		    side;	    /* stero side: always Mono */
    int		    clobber;	    /* clober state */
    DrawablePtr	    pDrawable;	    /* associated drawable */
} mbufBufferRec, *mbufBufferPtr;


/*
 * per-window data
 */

#define MB_WINDOW_PRIV(pWin) \
    ((mbufWindowPtr)((pWin)->devPrivates[MultibufferWindowIndex].ptr))

typedef struct _mbufWindow {
    WindowPtr	pWindow;		/* associated window */
    int		numMultibuffer;		/* count of buffers */
    mbufBufferPtr buffers;		/* array of (numMultibuffer) buffers */
    int		displayedMultibuffer;	/* currently active buffer */
    int		updateAction;		/* Undefined, Background,
					   Untouched, Copied */
    int		updateHint;		/* Frequent, Intermittent, Static */
    int		windowMode;		/* always Mono */
    TimeStamp	lastUpdate;		/* time of last update */
    short		x, y;		/* for static gravity */
    unsigned short	width, height;	/* last known window size */
    DevUnion		devPrivate;
} mbufWindowRec;


/*
 * per-screen data
 */

#define MB_SCREEN_PRIV(pScreen) \
    ((mbufScreenPtr)((pScreen)->devPrivates[MultibufferScreenIndex].ptr))

typedef struct _mbufScreen {
    long mbufWindowCount;		/* count of multibuffered windows */

    /* Wrap pScreen->DestroyWindow */
    DestroyWindowProcPtr DestroyWindow;
    long funcsWrapped;			/* flags which functions are wrapped */

    /* Initialized by device-dependent section */
    int  nInfo;				/* number of buffer info rec's */
    xMbufBufferInfo *pInfo;		/* buffer info (for Normal buffers) */

    int  (* CreateImageBuffers)(
#if NeedNestedPrototypes
		WindowPtr		/* pWin */,
		int			/* nbuf */,
		XID *			/* ids */,
		int			/* action */,
		int			/* hint */
#endif
    		);
    void (* DestroyImageBuffers)(
#if NeedNestedPrototypes
		WindowPtr		/* pWin */
#endif
    		);
    void (* DisplayImageBuffers)(
#if NeedNestedPrototypes
		ScreenPtr		/* pScreen */,
		mbufBufferPtr *		/* ppMBBuffer */,
		mbufWindowPtr *		/* ppMBWindow */,
		int			/* nbuf */
#endif
    		);
    void (* ClearImageBufferArea)(
#if NeedNestedPrototypes
		mbufBufferPtr		/* pMBBuffer */,
		short			/* x */,
		short			/* y */,
		unsigned short		/* width */,
		unsigned short		/* height */,
		Bool			/* exposures */
#endif
    		);
    Bool (* ChangeMBufferAttributes)(	/* pMBWindow, vmask */ 
#if NeedNestedPrototypes
    		/* FIXME */
#endif
    		);
    Bool (* ChangeBufferAttributes)(	/* pMBBuffer, vmask */
#if NeedNestedPrototypes
    		/* FIXME */
#endif
    		);
    void (* DeleteBufferDrawable)(
#if NeedNestedPrototypes
		DrawablePtr		/* pDrawable */
#endif
    		);
    void (* WrapScreenFuncs)(
#if NeedNestedPrototypes
		ScreenPtr		/* pScreen */
#endif
    		);
    void (* ResetProc)(
#if NeedNestedPrototypes
		ScreenPtr		/* pScreen */
#endif
    		);
    DevUnion	devPrivate;
} mbufScreenRec, *mbufScreenPtr;


/* Privates to mbufScreenRec */

#ifdef _MULTIBUF_PIXMAP_
#define MB_SCREEN_PRIV_PIXMAP(pScreen) \
    ((mbufPixmapPrivPtr) MB_SCREEN_PRIV((pScreen))->devPrivate.ptr)

typedef struct _mbufPixmapPriv
{
    /* Pointers to wrapped functions */
    PositionWindowProcPtr PositionWindow;		/* pWin, x,y */
    long funcsWrapped;			/* flags which functions are wrapped */
} mbufPixmapPrivRec, *mbufPixmapPrivPtr;
#endif /* _MULTIBUF_PIXMAP_ */


#ifdef _MULTIBUF_BUFFER_

extern int frameWindowPrivateIndex;

#define MB_SCREEN_PRIV_BUFFER(pScreen) \
    ((mbufBufferPrivPtr) MB_SCREEN_PRIV((pScreen))->devPrivate.ptr)

typedef struct _mbufBufferPriv
{
    DevUnion	*frameBuffer;	/* Array of screen framebuffers */
    DevUnion	selectPlane;	/* Plane(s) that select displayed buffer */

    /* 
     * Note: subtractRgn and unionRgn may overlap. subtractRgn is a union
     * of all the old clipLists of the windows that are displaying
     * the backbuffer. unionRgn is the union of all the new clipLists
     * of the same windows.
     */

    RegionRec	backBuffer;	/* Area of screen displaying back buffer */
    RegionRec   subtractRgn;	/* Regions lost to backBuffer   */
    RegionRec   unionRgn;	/* Regions gained by backBuffer */
    Bool	rgnChanged;	/* TRUE if "backBuffer" needs to be updated */

    void (* CopyBufferBits)();	/* pMBWindow, srcBufferNum, dstBufferNum */
    void (* DrawSelectPlane)();	/* pScreen, selectPlane, pRegion, bufferNum */

    /* Pointers to wrapped functions */
    PostValidateTreeProcPtr	PostValidateTree; /* pParent, pChild, kind */
    ClipNotifyProcPtr		ClipNotify;       /* pWin, dx, dy */
    WindowExposuresProcPtr	WindowExposures;  /* pWin, pRegion */
    CopyWindowProcPtr		CopyWindow;       /* pWin, oldPt, pOldRegion */
    ClearToBackgroundProcPtr	ClearToBackground; /* pWin, x,y,w,h, sendExpose */
    ChangeWindowAttributesProcPtr ChangeWindowAttributes; /* pWin, vmask */
    long funcsWrapped;			/* flags which functions are wrapped */
    unsigned  inClearToBackground:1;	/* used by WindowExposure */
} mbufBufferPrivRec, *mbufBufferPrivPtr;
#endif /* _MULTIBUF_BUFFER_ */

#endif /* _MULTIBUF_SERVER_ */
#endif /* _MULTIBUFST_H_ */