window.c

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      case Below:
	if (pSib)
	    if (pSib->nextSib != pWin)
		return(pSib->nextSib);
	    else
		return(pWin->nextSib);
	else
	    return NullWindow;
      case TopIf:
	if ((!pWin->mapped || (pSib && !pSib->mapped)) && !permitOldBugs)
	    return(pWin->nextSib);
	else if (pSib)
	{
	    if ((IsSiblingAboveMe(pWin, pSib) == Above) &&
		(RECT_IN_REGION(pScreen, &pSib->borderSize, &box) != rgnOUT))
		return(pFirst);
	    else
		return(pWin->nextSib);
	}
	else if (AnyWindowOverlapsMe(pWin, pHead, &box))
	    return(pFirst);
	else
	    return(pWin->nextSib);
      case BottomIf:
	if ((!pWin->mapped || (pSib && !pSib->mapped)) && !permitOldBugs)
	    return(pWin->nextSib);
	else if (pSib)
	{
	    if ((IsSiblingAboveMe(pWin, pSib) == Below) &&
		(RECT_IN_REGION(pScreen, &pSib->borderSize, &box) != rgnOUT))
		return NullWindow;
	    else
		return(pWin->nextSib);
	}
	else if (IOverlapAnyWindow(pWin, &box))
	    return NullWindow;
	else
	    return(pWin->nextSib);
      case Opposite:
	if ((!pWin->mapped || (pSib && !pSib->mapped)) && !permitOldBugs)
	    return(pWin->nextSib);
	else if (pSib)
	{
	    if (RECT_IN_REGION(pScreen, &pSib->borderSize, &box) != rgnOUT)
	    {
		if (IsSiblingAboveMe(pWin, pSib) == Above)
		    return(pFirst);
		else
		    return NullWindow;
	    }
	    else
		return(pWin->nextSib);
	}
	else if (AnyWindowOverlapsMe(pWin, pHead, &box))
	{
	    /* If I'm occluded, I can't possibly be the first child
	     * if (pWin == pWin->parent->firstChild)
	     *	  return pWin->nextSib;
	     */
	    return(pFirst);
	}
	else if (IOverlapAnyWindow(pWin, &box))
	    return NullWindow;
	else
	    return pWin->nextSib;
      default:
      {
	ErrorF("Internal error in ConfigureWindow, smode == %d\n",smode );
	return pWin->nextSib;
      }
    }
}

static void
#if NeedFunctionPrototypes
ReflectStackChange(
    register WindowPtr pWin,
    register WindowPtr pSib,
    VTKind  kind)
#else
ReflectStackChange(pWin, pSib, kind)
    register WindowPtr pWin, pSib;
    VTKind  kind;
#endif
{
/* Note that pSib might be NULL */

    Bool WasViewable = (Bool)pWin->viewable;
    WindowPtr pParent;
    Bool anyMarked;
    WindowPtr pFirstChange;
#ifdef DO_SAVE_UNDERS
    Bool	dosave = FALSE;
#endif
    WindowPtr  pLayerWin;
    ScreenPtr pScreen = pWin->drawable.pScreen;

    /* if this is a root window, can't be restacked */
    if (!(pParent = pWin->parent))
	return ;

    pFirstChange = MoveWindowInStack(pWin, pSib);

    if (WasViewable)
    {
	anyMarked = (*pScreen->MarkOverlappedWindows)(pWin, pFirstChange,
						      &pLayerWin);
	if (pLayerWin != pWin) pFirstChange = pLayerWin;
#ifdef DO_SAVE_UNDERS
	if (DO_SAVE_UNDERS(pWin))
	{
	    dosave = (*pScreen->ChangeSaveUnder)(pLayerWin, pFirstChange);
	}
#endif /* DO_SAVE_UNDERS */
	if (anyMarked)
	{
	    (*pScreen->ValidateTree)(pLayerWin->parent, pFirstChange, kind);
	    (*pScreen->HandleExposures)(pLayerWin->parent);
	}
#ifdef DO_SAVE_UNDERS
	if (dosave)
	    (*pScreen->PostChangeSaveUnder)(pLayerWin, pFirstChange);
#endif /* DO_SAVE_UNDERS */
	if (anyMarked && pWin->drawable.pScreen->PostValidateTree)
	    (*pScreen->PostValidateTree)(pLayerWin->parent, pFirstChange, kind);
    }
    if (pWin->realized)
	WindowsRestructured ();
}

/*****
 * ConfigureWindow
 *****/

int
ConfigureWindow(pWin, mask, vlist, client)
    register WindowPtr pWin;
    register Mask mask;
    XID *vlist;
    ClientPtr client;
{
#define RESTACK_WIN    0
#define MOVE_WIN       1
#define RESIZE_WIN     2
#define REBORDER_WIN   3
    register WindowPtr pSib = NullWindow;
    register WindowPtr pParent = pWin->parent;
    Window sibwid;
    Mask index2, tmask;
    register XID *pVlist;
    short x,   y, beforeX, beforeY;
    unsigned short w = pWin->drawable.width,
		   h = pWin->drawable.height,
		   bw = pWin->borderWidth;
    int action, smode = Above;
#ifdef XAPPGROUP
    ClientPtr win_owner;
    ClientPtr ag_leader = NULL;
#endif
    xEvent event;

    if ((pWin->drawable.class == InputOnly) && (mask & IllegalInputOnlyConfigureMask))
	return(BadMatch);

    if ((mask & CWSibling) && !(mask & CWStackMode))
	return(BadMatch);

    pVlist = vlist;

    if (pParent)
    {
	x = pWin->drawable.x - pParent->drawable.x - (int)bw;
	y = pWin->drawable.y - pParent->drawable.y - (int)bw;
    }
    else
    {
	x = pWin->drawable.x;
	y = pWin->drawable.y;
    }
    beforeX = x;
    beforeY = y;
    action = RESTACK_WIN;	
    if ((mask & (CWX | CWY)) && (!(mask & (CWHeight | CWWidth))))
    {
	GET_INT16(CWX, x);
	GET_INT16(CWY, y);
	action = MOVE_WIN;
    }
	/* or should be resized */
    else if (mask & (CWX |  CWY | CWWidth | CWHeight))
    {
	GET_INT16(CWX, x);
	GET_INT16(CWY, y);
	GET_CARD16(CWWidth, w);
	GET_CARD16 (CWHeight, h);
	if (!w || !h)
	{
	    client->errorValue = 0;
	    return BadValue;
	}
	action = RESIZE_WIN;
    }
    tmask = mask & ~ChangeMask;
    while (tmask)
    {
	index2 = (Mask)lowbit (tmask);
	tmask &= ~index2;
	switch (index2)
	{
	  case CWBorderWidth:
	    GET_CARD16(CWBorderWidth, bw);
	    break;
	  case CWSibling:
	    sibwid = (Window ) *pVlist;
	    pVlist++;
	    pSib = (WindowPtr )SecurityLookupIDByType(client, sibwid,
						RT_WINDOW, SecurityReadAccess);
	    if (!pSib)
	    {
		client->errorValue = sibwid;
		return(BadWindow);
	    }
	    if (pSib->parent != pParent)
		return(BadMatch);
	    if (pSib == pWin)
		return(BadMatch);
	    break;
	  case CWStackMode:
	    GET_CARD8(CWStackMode, smode);
	    if ((smode != TopIf) && (smode != BottomIf) &&
		(smode != Opposite) && (smode != Above) && (smode != Below))
	    {
		client->errorValue = smode;
		return(BadValue);
	    }
	    break;
	  default:
	    client->errorValue = mask;
	    return(BadValue);
	}
    }
	/* root really can't be reconfigured, so just return */
    if (!pParent)
	return Success;

	/* Figure out if the window should be moved.  Doesnt
	   make the changes to the window if event sent */

    if (mask & CWStackMode)
	pSib = WhereDoIGoInTheStack(pWin, pSib, pParent->drawable.x + x,
				    pParent->drawable.y + y,
				    w + (bw << 1), h + (bw << 1), smode);
    else
	pSib = pWin->nextSib;

#ifdef XAPPGROUP
    win_owner = clients[CLIENT_ID(pWin->drawable.id)];
    ag_leader = XagLeader (win_owner);
#endif

    if ((!pWin->overrideRedirect) && 
	(RedirectSend(pParent)
#ifdef XAPPGROUP
	|| (win_owner->appgroup && ag_leader && 
	    XagIsControlledRoot (client, pParent))
#endif
	))
    {
	event.u.u.type = ConfigureRequest;
	event.u.configureRequest.window = pWin->drawable.id;
	if (mask & CWSibling)
	   event.u.configureRequest.sibling = sibwid;
	else
	    event.u.configureRequest.sibling = None;
	if (mask & CWStackMode)
	   event.u.u.detail = smode;
	else
	    event.u.u.detail = Above;
	event.u.configureRequest.x = x;
	event.u.configureRequest.y = y;
	event.u.configureRequest.width = w;
	event.u.configureRequest.height = h;
	event.u.configureRequest.borderWidth = bw;
	event.u.configureRequest.valueMask = mask;
#ifdef XAPPGROUP
	/* make sure if the ag_leader maps the window it goes to the wm */
	if (ag_leader && ag_leader != client && 
	    XagIsControlledRoot (client, pParent)) {
	    event.u.configureRequest.parent = XagId (win_owner);
	    (void) TryClientEvents (ag_leader, &event, 1,
				    NoEventMask, NoEventMask, NullGrab);
	    return Success;
	}
#endif
	event.u.configureRequest.parent = pParent->drawable.id;
	if (MaybeDeliverEventsToClient(pParent, &event, 1,
		SubstructureRedirectMask, client) == 1)
	    return(Success);
    }
    if (action == RESIZE_WIN)
    {
	Bool size_change = (w != pWin->drawable.width)
			|| (h != pWin->drawable.height);
	if (size_change && ((pWin->eventMask|wOtherEventMasks(pWin)) & ResizeRedirectMask))
	{
	    xEvent eventT;
	    eventT.u.u.type = ResizeRequest;
	    eventT.u.resizeRequest.window = pWin->drawable.id;
	    eventT.u.resizeRequest.width = w;
	    eventT.u.resizeRequest.height = h;
	    if (MaybeDeliverEventsToClient(pWin, &eventT, 1,
				       ResizeRedirectMask, client) == 1)
	    {
		/* if event is delivered, leave the actual size alone. */
		w = pWin->drawable.width;
		h = pWin->drawable.height;
		size_change = FALSE;
	    }
	}
	if (!size_change)
	{
	    if (mask & (CWX | CWY))
		action = MOVE_WIN;
	    else if (mask & (CWStackMode | CWBorderWidth))
		action = RESTACK_WIN;
	    else   /* really nothing to do */
		return(Success) ;
	}
    }

    if (action == RESIZE_WIN)
	    /* we've already checked whether there's really a size change */
	    goto ActuallyDoSomething;
    if ((mask & CWX) && (x != beforeX))
	    goto ActuallyDoSomething;
    if ((mask & CWY) && (y != beforeY))
	    goto ActuallyDoSomething;
    if ((mask & CWBorderWidth) && (bw != wBorderWidth (pWin)))
	    goto ActuallyDoSomething;
    if (mask & CWStackMode)
    {
	if (pWin->nextSib != pSib)
	    goto ActuallyDoSomething;
    }
    return(Success);

ActuallyDoSomething:
    if (SubStrSend(pWin, pParent))
    {
	event.u.u.type = ConfigureNotify;
	event.u.configureNotify.window = pWin->drawable.id;
	if (pSib)
	    event.u.configureNotify.aboveSibling = pSib->drawable.id;
	else
	    event.u.configureNotify.aboveSibling = None;
	event.u.configureNotify.x = x;
	event.u.configureNotify.y = y;
	event.u.configureNotify.width = w;
	event.u.configureNotify.height = h;
	event.u.configureNotify.borderWidth = bw;
	event.u.configureNotify.override = pWin->overrideRedirect;
	DeliverEvents(pWin, &event, 1, NullWindow);
    }
    if (mask & CWBorderWidth)
    {
	if (action == RESTACK_WIN)
	{
	    action = MOVE_WIN;
	    pWin->borderWidth = bw;
	}
	else if ((action == MOVE_WIN) &&
		 (beforeX + wBorderWidth (pWin) == x + (int)bw) &&
		 (beforeY + wBorderWidth (pWin) == y + (int)bw))
	{
	    action = REBORDER_WIN;
	    (*pWin->drawable.pScreen->ChangeBorderWidth)(pWin, bw);
	}
	else
	    pWin->borderWidth = bw;
    }
    if (action == MOVE_WIN)
	(*pWin->drawable.pScreen->MoveWindow)(pWin, x, y, pSib,
		   (mask & CWBorderWidth) ? VTOther : VTMove);
    else if (action == RESIZE_WIN)
	(*pWin->drawable.pScreen->ResizeWindow)(pWin, x, y, w, h, pSib);
    else if (mask & CWStackMode)
	ReflectStackChange(pWin, pSib, VTOther);

    if (action != RESTACK_WIN)
	CheckCursorConfinement(pWin);

    return(Success);
#undef RESTACK_WIN
#undef MOVE_WIN
#undef RESIZE_WIN
#undef REBORDER_WIN
}


/******
 *
 * CirculateWindow
 *    For RaiseLowest, raises the lowest mapped child (if any) that is
 *    obscured by another child to the top of the stack.  For LowerHighest,
 *    lowers the highest mapped child (if any) that is obscuring another
 *    child to the bottom of the stack.	 Exposure processing is performed 
 *
 ******/

int
CirculateWindow(pParent, direction, client)
    WindowPtr pParent;
    int direction;
    ClientPtr client;
{
    register WindowPtr pWin, pHead, pFirst;
    xEvent event;
    BoxRec box;

    pHead = RealChildHead(pParent);
    pFirst = pHead ? pHead->nextSib : pParent->firstChild;
    if (direction == RaiseLowest)
    {
	for (pWin = pParent->lastChild;
	     (pWin != pHead) &&
	     !(pWin->mapped &&
	       AnyWindowOverlapsMe(pWin, pHead, WindowExtents(pWin, &box)));
	     pWin = pWin->prevSib) ;
	if (pWin == pHead)
	    return Success;
    }
    else
    {
	for (pWin = pFirst;
	     pWin &&
	     !(pWin->mapped &&
	       IOverlapAnyWindow(pWin, WindowExtents(pWin, &box)));
	     pWin = pWin->nextSib) ;
	if (!pWin)
	    return Success;
    }

    event.u.circulate.window = pWin->drawable.id;
    event.u.circulate.parent = pParent->drawable.id;
    event.u.circulate.event = pParent->drawable.id;
    if (direction == RaiseLowest)
	event.u.circulate.place = PlaceOnTop;
    else
	event.u.circulate.place = PlaceOnBottom;

    if (RedirectSend(pParent))
    {
	event.u.u.type = CirculateRequest;
	if (MaybeDeliverEventsToClient(pParent, &event, 1,
		SubstructureRedirectMask, client) == 1)
	    return(Success);
    }

    event.u.u.type = CirculateNotify;
    DeliverEvents(pWin, &event, 1, NullWindow);
    ReflectStackChange(pWin,
		       (direction == RaiseLowest) ? pFirst : NullWindow,
		       VTStack);

    return(Success);
}

static int
#if NeedFunctionPrototypes
CompareWIDs(
    WindowPtr pWin,
    pointer   value) /* must conform to VisitWindowProcPtr */
#else
CompareWIDs(pWin, value)
    WindowPtr pWin;
    pointer   value; /* must conform to VisitWindowProcPtr */
#endif
{
    Window *wid = (Window *)value;

    if (pWin->drawable.id == *wid)
       return(WT_STOPWALKING);
    else
       return(WT_WALKCHILDREN);
}

/*****
 *  ReparentWindow
 *****/

int
ReparentWindow(pWin, pParent, x, y, client)
    register WindowPtr pWin, pParent;
    int x,y;
    ClientPtr client;
{
    WindowPtr pPrev, pPriorParent;
    Bool WasMapped = (Bool)(pWin->mapped);
    xEvent event;
    int bw = wBorderWidth (pWin);
    register ScreenPtr pScreen;

    pScreen = pWin->drawable.pScreen;
    if (TraverseTree(pWin, CompareWIDs, (pointer)&pParent->drawable.id) == WT_STOPWALKING)
	return(BadMatch);		
    if (!MakeWindowOptional(pWin))
	return(BadAlloc);

    if (WasMapped)
       UnmapWindow(pWin, FALSE);

    event.u.u.type = ReparentNotify;
    event.u.reparent.window = pWin->drawable.id;
    event.u.reparent.parent = pParent->drawable.id;