mbuf.c

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	    pDrawable = (DrawablePtr)pWin;
	else
	    pDrawable = (DrawablePtr)pMultibuffer->pPixmap;

	ValidateGC(pDrawable, pClearGC);
	(*pClearGC->ops->PolyFillRect) (pDrawable, pClearGC, 1, &clearRect);
	FreeScratchGC(pClearGC);
    }

    if (stuff->exposures)
    {
	RegionRec region;
	BoxRec box;
	box.x1 = clearRect.x;
	box.y1 = clearRect.y;
	box.x2 = clearRect.x + clearRect.width;
	box.y2 = clearRect.y + clearRect.height;
	REGION_INIT(pScreen, &region, &box, 1);
	MultibufferExpose(pMultibuffer, &region);
	REGION_UNINIT(pScreen, &region);
    }
    return Success;
}

static int
ProcMultibufferDispatch (client)
    register ClientPtr	client;
{
    REQUEST(xReq);
    switch (stuff->data) {
    case X_MbufGetBufferVersion:
	return ProcGetBufferVersion (client);
    case X_MbufCreateImageBuffers:
	return ProcCreateImageBuffers (client);
    case X_MbufDisplayImageBuffers:
	return ProcDisplayImageBuffers (client);
    case X_MbufDestroyImageBuffers:
	return ProcDestroyImageBuffers (client);
    case X_MbufSetMBufferAttributes:
	return ProcSetMBufferAttributes (client);
    case X_MbufGetMBufferAttributes:
	return ProcGetMBufferAttributes (client);
    case X_MbufSetBufferAttributes:
	return ProcSetBufferAttributes (client);
    case X_MbufGetBufferAttributes:
	return ProcGetBufferAttributes (client);
    case X_MbufGetBufferInfo:
	return ProcGetBufferInfo (client);
    case X_MbufClearImageBufferArea:
	return ProcClearImageBufferArea (client);
    default:
	return BadRequest;
    }
}

static int
SProcGetBufferVersion (client)
    register ClientPtr	client;
{
    register int    n;
    REQUEST (xMbufGetBufferVersionReq);

    swaps (&stuff->length, n);
    return ProcGetBufferVersion (client);
}

static int
SProcCreateImageBuffers (client)
    register ClientPtr	client;
{
    register int    n;
    REQUEST (xMbufCreateImageBuffersReq);

    swaps (&stuff->length, n);
    REQUEST_AT_LEAST_SIZE (xMbufCreateImageBuffersReq);
    swapl (&stuff->window, n);
    SwapRestL(stuff);
    return ProcCreateImageBuffers (client);
}

static int
SProcDisplayImageBuffers (client)
    register ClientPtr	client;
{
    register int    n;
    REQUEST (xMbufDisplayImageBuffersReq);
    
    swaps (&stuff->length, n);
    REQUEST_AT_LEAST_SIZE (xMbufDisplayImageBuffersReq);
    swaps (&stuff->minDelay, n);
    swaps (&stuff->maxDelay, n);
    SwapRestL(stuff);
    return ProcDisplayImageBuffers (client);
}

static int
SProcDestroyImageBuffers (client)
    register ClientPtr	client;
{
    register int    n;
    REQUEST (xMbufDestroyImageBuffersReq);
    
    swaps (&stuff->length, n);
    REQUEST_SIZE_MATCH (xMbufDestroyImageBuffersReq);
    swapl (&stuff->window, n);
    return ProcDestroyImageBuffers (client);
}

static int
SProcSetMBufferAttributes (client)
    register ClientPtr	client;
{
    register int    n;
    REQUEST (xMbufSetMBufferAttributesReq);

    swaps (&stuff->length, n);
    REQUEST_AT_LEAST_SIZE(xMbufSetMBufferAttributesReq);
    swapl (&stuff->window, n);
    swapl (&stuff->valueMask, n);
    SwapRestL(stuff);
    return ProcSetMBufferAttributes (client);
}

static int
SProcGetMBufferAttributes (client)
    register ClientPtr	client;
{
    register int    n;
    REQUEST (xMbufGetMBufferAttributesReq);

    swaps (&stuff->length, n);
    REQUEST_AT_LEAST_SIZE(xMbufGetMBufferAttributesReq);
    swapl (&stuff->window, n);
    return ProcGetMBufferAttributes (client);
}

static int
SProcSetBufferAttributes (client)
    register ClientPtr	client;
{
    register int    n;
    REQUEST (xMbufSetBufferAttributesReq);

    swaps (&stuff->length, n);
    REQUEST_AT_LEAST_SIZE(xMbufSetBufferAttributesReq);
    swapl (&stuff->buffer, n);
    swapl (&stuff->valueMask, n);
    SwapRestL(stuff);
    return ProcSetBufferAttributes (client);
}

static int
SProcGetBufferAttributes (client)
    register ClientPtr	client;
{
    register int    n;
    REQUEST (xMbufGetBufferAttributesReq);

    swaps (&stuff->length, n);
    REQUEST_AT_LEAST_SIZE(xMbufGetBufferAttributesReq);
    swapl (&stuff->buffer, n);
    return ProcGetBufferAttributes (client);
}

static int
SProcGetBufferInfo (client)
    register ClientPtr	client;
{
    register int    n;
    REQUEST (xMbufGetBufferInfoReq);

    swaps (&stuff->length, n);
    REQUEST_SIZE_MATCH (xMbufGetBufferInfoReq);
    swapl (&stuff->drawable, n);
    return ProcGetBufferInfo (client);
}

static int
SProcClearImageBufferArea(client)
    register ClientPtr client;
{
    register char n;
    REQUEST(xMbufClearImageBufferAreaReq);

    swaps(&stuff->length, n);
    REQUEST_SIZE_MATCH (xMbufClearImageBufferAreaReq);
    swapl(&stuff->buffer, n);
    swaps(&stuff->x, n);
    swaps(&stuff->y, n);
    swaps(&stuff->width, n);
    swaps(&stuff->height, n);
    return ProcClearImageBufferArea(client);
}

static int
SProcMultibufferDispatch (client)
    register ClientPtr	client;
{
    REQUEST(xReq);
    switch (stuff->data) {
    case X_MbufGetBufferVersion:
	return SProcGetBufferVersion (client);
    case X_MbufCreateImageBuffers:
	return SProcCreateImageBuffers (client);
    case X_MbufDisplayImageBuffers:
	return SProcDisplayImageBuffers (client);
    case X_MbufDestroyImageBuffers:
	return SProcDestroyImageBuffers (client);
    case X_MbufSetMBufferAttributes:
	return SProcSetMBufferAttributes (client);
    case X_MbufGetMBufferAttributes:
	return SProcGetMBufferAttributes (client);
    case X_MbufSetBufferAttributes:
	return SProcSetBufferAttributes (client);
    case X_MbufGetBufferAttributes:
	return SProcGetBufferAttributes (client);
    case X_MbufGetBufferInfo:
	return SProcGetBufferInfo (client);
    case X_MbufClearImageBufferArea:
	return SProcClearImageBufferArea (client);
    default:
	return BadRequest;
    }
}

static void
SUpdateNotifyEvent (from, to)
    xMbufUpdateNotifyEvent	*from, *to;
{
    to->type = from->type;
    cpswaps (from->sequenceNumber, to->sequenceNumber);
    cpswapl (from->buffer, to->buffer);
    cpswapl (from->timeStamp, to->timeStamp);
}

static void
SClobberNotifyEvent (from, to)
    xMbufClobberNotifyEvent	*from, *to;
{
    to->type = from->type;
    cpswaps (from->sequenceNumber, to->sequenceNumber);
    cpswapl (from->buffer, to->buffer);
    to->state = from->state;
}

static void
PerformDisplayRequest (ppMultibuffers, pMultibuffer, nbuf)
    MultibufferPtr	    *pMultibuffer;
    MultibuffersPtr	    *ppMultibuffers;
    int		    nbuf;
{
    GCPtr	    pGC;
    PixmapPtr	    pPrevPixmap, pNewPixmap;
    xRectangle	    clearRect;
    WindowPtr	    pWin;
    RegionPtr	    pExposed;
    int		    i;
    MultibufferPtr  pPrevMultibuffer;
    XID		    graphicsExpose;

    UpdateCurrentTime ();
    for (i = 0; i < nbuf; i++)
    {
	pWin = ppMultibuffers[i]->pWindow;
	pGC = GetScratchGC (pWin->drawable.depth, pWin->drawable.pScreen);
	pPrevMultibuffer =
	   &ppMultibuffers[i]->buffers[ppMultibuffers[i]->displayedMultibuffer];
	pPrevPixmap = pPrevMultibuffer->pPixmap;
	pNewPixmap = pMultibuffer[i]->pPixmap;
	switch (ppMultibuffers[i]->updateAction)
	{
	case MultibufferUpdateActionUndefined:
	    break;
	case MultibufferUpdateActionBackground:
	    SetupBackgroundPainter (pWin, pGC);
	    ValidateGC ((DrawablePtr)pPrevPixmap, pGC);
	    clearRect.x = 0;
	    clearRect.y = 0;
	    clearRect.width = pPrevPixmap->drawable.width;
	    clearRect.height = pPrevPixmap->drawable.height;
	    (*pGC->ops->PolyFillRect) ((DrawablePtr)pPrevPixmap, pGC,
				       1, &clearRect);
	    break;
	case MultibufferUpdateActionUntouched:
	    /* copy the window to the pixmap that represents the
	     * currently displayed buffer
	     */
	    if (pPrevMultibuffer->eventMask & ExposureMask)
	    {
	    	graphicsExpose = TRUE;
	    	DoChangeGC (pGC, GCGraphicsExposures, &graphicsExpose, FALSE);
	    }
	    ValidateGC ((DrawablePtr)pPrevPixmap, pGC);
	    pExposed = (*pGC->ops->CopyArea)
			    ((DrawablePtr) pWin,
			     (DrawablePtr) pPrevPixmap,
			     pGC,
			     0, 0,
			     pWin->drawable.width, pWin->drawable.height,
			     0, 0);

	    /* if we couldn't copy the whole window to the buffer,
	     * send expose events (if any client wants them)
	     */
	    if (pPrevMultibuffer->eventMask & ExposureMask)
	    { /* some client wants expose events */
	    	if (pExposed)
	    	{
		    RegionPtr	pWinSize;
		    ScreenPtr pScreen = pWin->drawable.pScreen;

		    pWinSize = CreateUnclippedWinSize (pWin);
		    /* pExposed is window-relative, but at this point
		     * pWinSize is screen-relative.  Make pWinSize be
		     * window-relative so that region ops involving
		     * pExposed and pWinSize behave sensibly.
		     */
		    REGION_TRANSLATE(pScreen, pWinSize,
				     -pWin->drawable.x,
				     -pWin->drawable.y);
		    REGION_INTERSECT(pScreen, pExposed, pExposed, pWinSize);
		    REGION_DESTROY(pScreen, pWinSize);
	    	    MultibufferExpose (pPrevMultibuffer, pExposed);
	    	    REGION_DESTROY(pScreen, pExposed);
	    	}
	    	graphicsExpose = FALSE;
	    	DoChangeGC (pGC, GCGraphicsExposures, &graphicsExpose, FALSE);
	    }
	    break; /* end case MultibufferUpdateActionUntouched */

	case MultibufferUpdateActionCopied:
	    ValidateGC ((DrawablePtr)pPrevPixmap, pGC);
	    (*pGC->ops->CopyArea) ((DrawablePtr)pNewPixmap,
				   (DrawablePtr)pPrevPixmap, pGC,
				   0, 0,
				   pWin->drawable.width, pWin->drawable.height,
				   0, 0);
	    break;
	} /* end switch on update action */

	/* display the new buffer */
	ValidateGC ((DrawablePtr)pWin, pGC);
	(*pGC->ops->CopyArea) ((DrawablePtr)pNewPixmap, (DrawablePtr)pWin, pGC,
			       0, 0,
			       pWin->drawable.width, pWin->drawable.height,
			       0, 0);
	ppMultibuffers[i]->lastUpdate = currentTime;
	MultibufferUpdate (pMultibuffer[i],
			   ppMultibuffers[i]->lastUpdate.milliseconds);
	AliasMultibuffer (ppMultibuffers[i],
			  pMultibuffer[i] - ppMultibuffers[i]->buffers);
	FreeScratchGC (pGC);
    }
}

DrawablePtr
GetBufferPointer (pWin, i)
    WindowPtr	pWin;
    int		i;
{
    MultibuffersPtr pMultibuffers;

    if (!(pMultibuffers = (MultibuffersPtr) pWin->devPrivates[MultibufferWindowIndex].ptr))
	return NULL;
    return (DrawablePtr) pMultibuffers->buffers[i].pPixmap;
}

int
DisplayImageBuffers (ids, nbuf)
    XID	    *ids;
    int	    nbuf;
{
    MultibufferPtr  *pMultibuffer;
    MultibuffersPtr *pMultibuffers;
    int		    i, j;

    pMultibuffer = (MultibufferPtr *) ALLOCATE_LOCAL (nbuf * sizeof *pMultibuffer +
				   nbuf * sizeof *pMultibuffers);
    if (!pMultibuffer)
	return BadAlloc;
    pMultibuffers = (MultibuffersPtr *) (pMultibuffer + nbuf);
    for (i = 0; i < nbuf; i++)
    {
	pMultibuffer[i] = (MultibufferPtr) LookupIDByType (ids[i], MultibufferResType);
	if (!pMultibuffer[i])
	{
	    DEALLOCATE_LOCAL (pMultibuffer);
	    return MultibufferErrorBase + MultibufferBadBuffer;
	}
	pMultibuffers[i] = pMultibuffer[i]->pMultibuffers;
	for (j = 0; j < i; j++)
	    if (pMultibuffers[i] == pMultibuffers[j])
	    {
		DEALLOCATE_LOCAL (pMultibuffer);
		return BadMatch;
	    }
    }
    PerformDisplayRequest (pMultibuffers, pMultibuffer, nbuf);
    DEALLOCATE_LOCAL (pMultibuffer);
    return Success;
}


static Bool
QueueDisplayRequest (client, activateTime)
    ClientPtr	    client;
    TimeStamp	    activateTime;
{
    /* see xtest.c:ProcXTestFakeInput for code similar to this */

    if (!ClientSleepUntil(client, &activateTime, NULL, NULL))
    {
	return FALSE;
    }
    /* swap the request back so we can simply re-execute it */
    if (client->swapped)
    {
    	register int    n;
    	REQUEST (xMbufDisplayImageBuffersReq);
    	
    	SwapRestL(stuff);
    	swaps (&stuff->length, n);
    	swaps (&stuff->minDelay, n);
    	swaps (&stuff->maxDelay, n);
    }
    ResetCurrentRequest (client);
    client->sequence--;
    return TRUE;
}


/*
 * Deliver events to a buffer
 */

static int
DeliverEventsToMultibuffer (pMultibuffer, pEvents, count, filter)
    MultibufferPtr	pMultibuffer;
    xEvent	*pEvents;
    int		count;
    Mask	filter;
{
    int deliveries = 0, nondeliveries = 0;
    int attempt;
    OtherClients *other;

    /* if nobody wants the event, we're done */
    if (!((pMultibuffer->otherEventMask|pMultibuffer->eventMask) & filter))
	return 0;

    /* maybe send event to owner */
    if ((attempt = TryClientEvents(