mbuf.c

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	bClient(pMultibuffer), pEvents, count, pMultibuffer->eventMask, filter, (GrabPtr) 0)) != 0)
    {
	if (attempt > 0)
	    deliveries++;
	else
	    nondeliveries--;
    }

    /* maybe send event to other clients */
    for (other = pMultibuffer->otherClients; other; other=other->next)
    {
	if ((attempt = TryClientEvents(
	      rClient(other), pEvents, count, other->mask, filter, (GrabPtr) 0)) != 0)
	{
	    if (attempt > 0)
		deliveries++;
	    else
		nondeliveries--;
	}
    }
    if (deliveries)
	return deliveries;
    return nondeliveries;
}

/*
 * Send Expose events to interested clients
 */

void
MultibufferExpose (pMultibuffer, pRegion)
    MultibufferPtr	pMultibuffer;
    RegionPtr	pRegion;
{
    if (pRegion && !REGION_NIL(pRegion))
    {
	xEvent *pEvent;
	PixmapPtr   pPixmap;
	register xEvent *pe;
	register BoxPtr pBox;
	register int i;
	int numRects;

	pPixmap = pMultibuffer->pPixmap;
	REGION_TRANSLATE(pPixmap->drawable.pScreen, pRegion,
		    -pPixmap->drawable.x, -pPixmap->drawable.y);
	/* XXX MultibufferExpose "knows" the region representation */
	numRects = REGION_NUM_RECTS(pRegion);
	pBox = REGION_RECTS(pRegion);

	pEvent = (xEvent *) ALLOCATE_LOCAL(numRects * sizeof(xEvent));
	if (pEvent) {
	    pe = pEvent;

	    for (i=1; i<=numRects; i++, pe++, pBox++)
	    {
		pe->u.u.type = Expose;
		pe->u.expose.window = pPixmap->drawable.id;
		pe->u.expose.x = pBox->x1;
		pe->u.expose.y = pBox->y1;
		pe->u.expose.width = pBox->x2 - pBox->x1;
		pe->u.expose.height = pBox->y2 - pBox->y1;
		pe->u.expose.count = (numRects - i);
	    }
	    (void) DeliverEventsToMultibuffer (pMultibuffer, pEvent, numRects,
					       ExposureMask);
	    DEALLOCATE_LOCAL(pEvent);
	}
    }
}

/* send UpdateNotify event */
void
MultibufferUpdate (pMultibuffer, time2)
    MultibufferPtr	pMultibuffer;
    CARD32	time2;
{
    xMbufUpdateNotifyEvent	event;

    event.type = MultibufferEventBase + MultibufferUpdateNotify;
    event.buffer = pMultibuffer->pPixmap->drawable.id;
    event.timeStamp = time2;
    (void) DeliverEventsToMultibuffer (pMultibuffer, (xEvent *)&event,
				1, (Mask)MultibufferUpdateNotifyMask);
}

/*
 * The sample implementation will never generate MultibufferClobberNotify
 * events
 */

void
MultibufferClobber (pMultibuffer)
    MultibufferPtr	pMultibuffer;
{
    xMbufClobberNotifyEvent	event;

    event.type = MultibufferEventBase + MultibufferClobberNotify;
    event.buffer = pMultibuffer->pPixmap->drawable.id;
    event.state = pMultibuffer->clobber;
    (void) DeliverEventsToMultibuffer (pMultibuffer, (xEvent *)&event,
				1, (Mask)MultibufferClobberNotifyMask);
}

/*
 * make the resource id for buffer i refer to the window
 * drawable instead of the pixmap;
 */

static void
AliasMultibuffer (pMultibuffers, i)
    MultibuffersPtr	pMultibuffers;
    int		i;
{
    MultibufferPtr	pMultibuffer;

    if (i == pMultibuffers->displayedMultibuffer)
	return;
    /*
     * remove the old association
     */
    if (pMultibuffers->displayedMultibuffer >= 0)
    {
	pMultibuffer = &pMultibuffers->buffers[pMultibuffers->displayedMultibuffer];
	ChangeResourceValue (pMultibuffer->pPixmap->drawable.id,
			     MultibufferDrawableResType,
 			     (pointer) pMultibuffer->pPixmap);
    }
    /*
     * make the new association
     */
    pMultibuffer = &pMultibuffers->buffers[i];
    ChangeResourceValue (pMultibuffer->pPixmap->drawable.id,
			 MultibufferDrawableResType,
			 (pointer) pMultibuffers->pWindow);
    pMultibuffers->displayedMultibuffer = i;
}

/*
 * free everything associated with multibuffering for this
 * window
 */

void
DestroyImageBuffers (pWin)
    WindowPtr	pWin;
{
    FreeResourceByType (pWin->drawable.id, MultibuffersResType, FALSE);
    /* Zero out the window's pointer to the buffers so they won't be reused */
    pWin->devPrivates[MultibufferWindowIndex].ptr = NULL;
}

/*
 * resize the buffers when the window is resized
 */ 

static Bool
MultibufferPositionWindow (pWin, x, y)
    WindowPtr	pWin;
    int		x, y;
{
    ScreenPtr	    pScreen;
    MultibufferScreenPtr pMultibufferScreen;
    MultibuffersPtr	    pMultibuffers;
    MultibufferPtr	    pMultibuffer;
    int		    width, height;
    int		    i;
    int		    dx, dy, dw, dh;
    int		    sourcex, sourcey;
    int		    destx, desty;
    PixmapPtr	    pPixmap;
    GCPtr	    pGC;
    int		    savewidth, saveheight;
    xRectangle	    clearRect;
    Bool	    clear;

    pScreen = pWin->drawable.pScreen;
    pMultibufferScreen = (MultibufferScreenPtr) pScreen->devPrivates[MultibufferScreenIndex].ptr;
    (*pMultibufferScreen->PositionWindow) (pWin, x, y);

    /* if this window is not multibuffered, we're done */
    if (!(pMultibuffers = (MultibuffersPtr) pWin->devPrivates[MultibufferWindowIndex].ptr))
	return TRUE;

    /* if new size is same as old, we're done */
    if (pMultibuffers->width == pWin->drawable.width &&
        pMultibuffers->height == pWin->drawable.height)
	return TRUE;

    width = pWin->drawable.width;
    height = pWin->drawable.height;
    dx = pWin->drawable.x - pMultibuffers->x;
    dy = pWin->drawable.x - pMultibuffers->y;
    dw = width - pMultibuffers->width;
    dh = height - pMultibuffers->height;
    GravityTranslate (0, 0, -dx, -dy, dw, dh,
		      pWin->bitGravity, &destx, &desty);

    /* if the window grew, remember to paint the window background,
     * and maybe send expose events, for the new areas of the buffers
     */
    clear = pMultibuffers->width < width || pMultibuffers->height < height ||
		pWin->bitGravity == ForgetGravity;

    sourcex = 0;
    sourcey = 0;
    savewidth = pMultibuffers->width;
    saveheight = pMultibuffers->height;
    /* clip rectangle to source and destination */
    if (destx < 0)
    {
	savewidth += destx;
	sourcex -= destx;
	destx = 0;
    }
    if (destx + savewidth > width)
	savewidth = width - destx;
    if (desty < 0)
    {
	saveheight += desty;
	sourcey -= desty;
	desty = 0;
    }
    if (desty + saveheight > height)
	saveheight = height - desty;

    pMultibuffers->width = width;
    pMultibuffers->height = height;
    pMultibuffers->x = pWin->drawable.x;
    pMultibuffers->y = pWin->drawable.y;

    pGC = GetScratchGC (pWin->drawable.depth, pScreen);
    if (clear)
    {
	SetupBackgroundPainter (pWin, pGC);
	clearRect.x = 0;
	clearRect.y = 0;
	clearRect.width = width;
	clearRect.height = height;
    }
    for (i = 0; i < pMultibuffers->numMultibuffer; i++)
    {
	pMultibuffer = &pMultibuffers->buffers[i];
	pPixmap = (*pScreen->CreatePixmap) (pScreen, width, height,
					    pWin->drawable.depth);
	if (!pPixmap)
	{
	    DestroyImageBuffers (pWin);
	    break;
	}
	ValidateGC ((DrawablePtr)pPixmap, pGC);
	/*
	 * I suppose this could avoid quite a bit of work if
	 * it computed the minimal area required.
	 */
	if (clear)
	    (*pGC->ops->PolyFillRect) ((DrawablePtr)pPixmap, pGC, 1, &clearRect);
	if (pWin->bitGravity != ForgetGravity)
	{
	    (*pGC->ops->CopyArea) ((DrawablePtr)pMultibuffer->pPixmap,
				   (DrawablePtr)pPixmap, pGC,
				    sourcex, sourcey, savewidth, saveheight,
				    destx, desty);
	}
	pPixmap->drawable.id = pMultibuffer->pPixmap->drawable.id;
	(*pScreen->DestroyPixmap) (pMultibuffer->pPixmap);
	pMultibuffer->pPixmap = pPixmap;
	if (i != pMultibuffers->displayedMultibuffer)
	{
	    ChangeResourceValue (pPixmap->drawable.id,
				 MultibufferDrawableResType,
				 (pointer) pPixmap);
	}
    }
    FreeScratchGC (pGC);
    return TRUE;
}

/* Resource delete func for MultibufferDrawableResType */
/*ARGSUSED*/
static int
MultibufferDrawableDelete (value, id)
    pointer	value;
    XID		id;
{
    DrawablePtr	pDrawable = (DrawablePtr)value;
    WindowPtr	pWin;
    MultibuffersPtr	pMultibuffers;
    PixmapPtr	pPixmap;

    if (pDrawable->type == DRAWABLE_WINDOW)
    {
	pWin = (WindowPtr) pDrawable;
	pMultibuffers = (MultibuffersPtr) pWin->devPrivates[MultibufferWindowIndex].ptr;
	pPixmap = pMultibuffers->buffers[pMultibuffers->displayedMultibuffer].pPixmap;
    }
    else
    {
	pPixmap = (PixmapPtr) pDrawable;
    }
    (*pPixmap->drawable.pScreen->DestroyPixmap) (pPixmap);
    return Success;
}

/* Resource delete func for MultibufferResType */
/*ARGSUSED*/
static int
MultibufferDelete (value, id)
    pointer	value;
    XID		id;
{
    MultibufferPtr	pMultibuffer = (MultibufferPtr)value;
    MultibuffersPtr	pMultibuffers;

    pMultibuffers = pMultibuffer->pMultibuffers;
    if (--pMultibuffers->refcnt == 0)
    {
	FreeResourceByType (pMultibuffers->pWindow->drawable.id,
			    MultibuffersResType, TRUE);
	xfree (pMultibuffers);
    }
    return Success;
}

/* Resource delete func for MultibuffersResType */
/*ARGSUSED*/
static int
MultibuffersDelete (value, id)
    pointer	value;
    XID		id;
{
    MultibuffersPtr	pMultibuffers = (MultibuffersPtr)value;
    int	i;

    if (pMultibuffers->refcnt == pMultibuffers->numMultibuffer)
    {
	for (i = pMultibuffers->numMultibuffer; --i >= 0; )
	    FreeResource (pMultibuffers->buffers[i].pPixmap->drawable.id, 0);
    }
    return Success;
}

/* Resource delete func for OtherClientResType */
static int
OtherClientDelete (value, id)
    pointer	value;
    XID		id;
{
    MultibufferPtr	pMultibuffer = (MultibufferPtr)value;
    register OtherClientsPtr	other, prev;

    prev = 0;
    for (other = pMultibuffer->otherClients; other; other = other->next)
    {
	if (other->resource == id)
	{
	    if (prev)
		prev->next = other->next;
	    else
		pMultibuffer->otherClients = other->next;
	    xfree (other);
	    RecalculateMultibufferOtherEvents (pMultibuffer);
	    break;
	}
	prev = other;
    }
    return Success;
}

static int
EventSelectForMultibuffer (pMultibuffer, client, mask)
    MultibufferPtr	pMultibuffer;
    ClientPtr	client;
    Mask	mask;
{
    OtherClientsPtr	other;

    if (mask & ~ValidEventMasks)
    {
	client->errorValue = mask;
	return BadValue;
    }
    if (bClient (pMultibuffer) == client)
    {
	pMultibuffer->eventMask = mask;
    }
    else /* some other client besides the creator wants events */
    {
	for (other = pMultibuffer->otherClients; other; other = other->next)
	{
	    if (SameClient (other, client))
	    {
		if (mask == 0)
		{
		    FreeResource (other->resource, RT_NONE);
		    break;
		}
		other->mask = mask;
		break;
	    }
	}
	if (!other)
	{ /* new client that never selected events on this buffer before */
	    other = (OtherClients *) xalloc (sizeof (OtherClients));
	    if (!other)
		return BadAlloc;
	    other->mask = mask;
	    other->resource = FakeClientID (client->index);
	    if (!AddResource (other->resource, OtherClientResType, (pointer) pMultibuffer))
	    {
		xfree (other);
		return BadAlloc;
	    }
	    other->next = pMultibuffer->otherClients;
	    pMultibuffer->otherClients = other;
	}
	RecalculateMultibufferOtherEvents (pMultibuffer);
    }
    return (client->noClientException);
}

/* or together all the otherClients event masks */
static void
RecalculateMultibufferOtherEvents (pMultibuffer)
    MultibufferPtr	pMultibuffer;
{
    Mask	    otherEventMask;
    OtherClients    *other;

    otherEventMask = 0L;
    for (other = pMultibuffer->otherClients; other; other = other->next)
	otherEventMask |= other->mask;
    pMultibuffer->otherEventMask = otherEventMask;
}

/* add milliseconds to a timestamp, handling overflow */
static void
BumpTimeStamp (ts, inc)
TimeStamp   *ts;
CARD32	    inc;
{
    CARD32  newms;

    newms = ts->milliseconds + inc;
    if (newms < ts->milliseconds)
	ts->months++;
    ts->milliseconds = newms;
}