mivaltree.c

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    if ((pChild = pParent->firstChild) && pParent->mapped)
    {
	REGION_INIT(pScreen, &childUniverse, NullBox, 0);
	REGION_INIT(pScreen, &childUnion, NullBox, 0);
	if ((pChild->drawable.y < pParent->lastChild->drawable.y) ||
	    ((pChild->drawable.y == pParent->lastChild->drawable.y) &&
	     (pChild->drawable.x < pParent->lastChild->drawable.x)))
	{
	    for (; pChild; pChild = pChild->nextSib)
	    {
		if (pChild->viewable)
		    REGION_APPEND( pScreen, &childUnion, &pChild->borderSize);
	    }
	}
	else
	{
	    for (pChild = pParent->lastChild; pChild; pChild = pChild->prevSib)
	    {
		if (pChild->viewable)
		    REGION_APPEND( pScreen, &childUnion, &pChild->borderSize);
	    }
	}
	REGION_VALIDATE( pScreen, &childUnion, &overlap);

	for (pChild = pParent->firstChild;
	     pChild;
	     pChild = pChild->nextSib)
 	{
	    if (pChild->viewable) {
		/*
		 * If the child is viewable, we want to remove its extents
		 * from the current universe, but we only re-clip it if
		 * it's been marked.
		 */
		if (pChild->valdata) {
		    /*
		     * Figure out the new universe from the child's
		     * perspective and recurse.
		     */
		    REGION_INTERSECT( pScreen, &childUniverse,
					    universe,
					    &pChild->borderSize);
		    miComputeClips (pChild, pScreen, &childUniverse, kind,
				    exposed);
		}
		/*
		 * Once the child has been processed, we remove its extents
		 * from the current universe, thus denying its space to any
		 * other sibling.
		 */
		if (overlap)
		    REGION_SUBTRACT( pScreen, universe, universe,
					  &pChild->borderSize);
	    }
	}
	if (!overlap)
	    REGION_SUBTRACT( pScreen, universe, universe, &childUnion);
	REGION_UNINIT( pScreen, &childUnion);
	REGION_UNINIT( pScreen, &childUniverse);
    } /* if any children */

    /*
     * 'universe' now contains the new clipList for the parent window.
     *
     * To figure the exposure of the window we subtract the old clip from the
     * new, just as for the border.
     */

    if (oldVis == VisibilityFullyObscured ||
	oldVis == VisibilityNotViewable)
    {
	REGION_COPY( pScreen, &pParent->valdata->after.exposed, universe);
    }
    else if (newVis != VisibilityFullyObscured &&
	     newVis != VisibilityNotViewable)
    {
    	REGION_SUBTRACT( pScreen, &pParent->valdata->after.exposed,
			       universe, &pParent->clipList);
    }

    /*
     * One last thing: backing storage. We have to try to save what parts of
     * the window are about to be obscured. We can just subtract the universe
     * from the old clipList and get the areas that were in the old but aren't
     * in the new and, hence, are about to be obscured.
     */
    if (pParent->backStorage && !resized)
    {
	REGION_SUBTRACT( pScreen, exposed, &pParent->clipList, universe);
	(* pScreen->SaveDoomedAreas)(pParent, exposed, dx, dy);
    }
    
    /* HACK ALERT - copying contents of regions, instead of regions */
    {
	RegionRec   tmp;

	tmp = pParent->clipList;
	pParent->clipList = *universe;
	*universe = tmp;
    }

#ifdef NOTDEF
    REGION_COPY( pScreen, &pParent->clipList, universe);
#endif

    pParent->drawable.serialNumber = NEXT_SERIAL_NUMBER;

    if (pScreen->ClipNotify)
	(* pScreen->ClipNotify) (pParent, dx, dy);
}

static void
miTreeObscured(pParent)
    register WindowPtr pParent;
{
    register WindowPtr pChild;
    register int    oldVis;

    pChild = pParent;
    while (1)
    {
	if (pChild->viewable)
	{
	    oldVis = pChild->visibility;
	    if (oldVis != (pChild->visibility = VisibilityFullyObscured) &&
		((pChild->eventMask | wOtherEventMasks(pChild)) & VisibilityChangeMask))
		SendVisibilityNotify(pChild);
	    if (pChild->firstChild)
	    {
		pChild = pChild->firstChild;
		continue;
	    }
	}
	while (!pChild->nextSib && (pChild != pParent))
	    pChild = pChild->parent;
	if (pChild == pParent)
	    break;
	pChild = pChild->nextSib;
    }
}

/*-
 *-----------------------------------------------------------------------
 * miValidateTree --
 *	Recomputes the clip list for pParent and all its inferiors.
 *
 * Results:
 *	Always returns 1.
 *
 * Side Effects:
 *	The clipList, borderClip, exposed, and borderExposed regions for
 *	each marked window are altered.
 *
 * Notes:
 *	This routine assumes that all affected windows have been marked
 *	(valdata created) and their winSize and borderSize regions
 *	adjusted to correspond to their new positions. The borderClip and
 *	clipList regions should not have been touched.
 *
 *	The top-most level is treated differently from all lower levels
 *	because pParent is unchanged. For the top level, we merge the
 *	regions taken up by the marked children back into the clipList
 *	for pParent, thus forming a region from which the marked children
 *	can claim their areas. For lower levels, where the old clipList
 *	and borderClip are invalid, we can't do this and have to do the
 *	extra operations done in miComputeClips, but this is much faster
 *	e.g. when only one child has moved...
 *
 *-----------------------------------------------------------------------
 */
/*ARGSUSED*/
int
miValidateTree (pParent, pChild, kind)
    WindowPtr	  	pParent;    /* Parent to validate */
    WindowPtr	  	pChild;     /* First child of pParent that was
				     * affected */
    VTKind    	  	kind;       /* What kind of configuration caused call */
{
    RegionRec	  	totalClip;  /* Total clipping region available to
				     * the marked children. pParent's clipList
				     * merged with the borderClips of all
				     * the marked children. */
    RegionRec	  	childClip;  /* The new borderClip for the current
				     * child */
    RegionRec		childUnion; /* the space covered by borderSize for
				     * all marked children */
    RegionRec		exposed;    /* For intermediate calculations */
    register ScreenPtr	pScreen;
    register WindowPtr	pWin;
    Bool		overlap;
    int			viewvals;
    Bool		forward;

    pScreen = pParent->drawable.pScreen;
    if (pChild == NullWindow)
	pChild = pParent->firstChild;

    REGION_INIT(pScreen, &childClip, NullBox, 0);
    REGION_INIT(pScreen, &exposed, NullBox, 0);

    /*
     * compute the area of the parent window occupied
     * by the marked children + the parent itself.  This
     * is the area which can be divied up among the marked
     * children in their new configuration.
     */
    REGION_INIT(pScreen, &totalClip, NullBox, 0);
    viewvals = 0;
    if ((pChild->drawable.y < pParent->lastChild->drawable.y) ||
	((pChild->drawable.y == pParent->lastChild->drawable.y) &&
	 (pChild->drawable.x < pParent->lastChild->drawable.x)))
    {
	forward = TRUE;
	for (pWin = pChild; pWin; pWin = pWin->nextSib)
	{
	    if (pWin->valdata)
	    {
		REGION_APPEND( pScreen, &totalClip, &pWin->borderClip);
		if (pWin->viewable)
		    viewvals++;
	    }
	}
    }
    else
    {
	forward = FALSE;
	pWin = pParent->lastChild;
	while (1)
	{
	    if (pWin->valdata)
	    {
		REGION_APPEND( pScreen, &totalClip, &pWin->borderClip);
		if (pWin->viewable)
		    viewvals++;
	    }
	    if (pWin == pChild)
		break;
	    pWin = pWin->prevSib;
	}
    }
    REGION_VALIDATE( pScreen, &totalClip, &overlap);

    /*
     * Now go through the children of the root and figure their new
     * borderClips from the totalClip, passing that off to miComputeClips
     * to handle recursively. Once that's done, we remove the child
     * from the totalClip to clip any siblings below it.
     */

    overlap = TRUE;
    if (kind != VTStack)
    {
	REGION_UNION( pScreen, &totalClip, &totalClip, &pParent->clipList);
	if (viewvals > 1)
	{
	    /*
	     * precompute childUnion to discover whether any of them
	     * overlap.  This seems redundant, but performance studies
	     * have demonstrated that the cost of this loop is
	     * lower than the cost of multiple Subtracts in the
	     * loop below.
	     */
	    REGION_INIT(pScreen, &childUnion, NullBox, 0);
	    if (forward)
	    {
		for (pWin = pChild; pWin; pWin = pWin->nextSib)
		    if (pWin->valdata && pWin->viewable)
			REGION_APPEND( pScreen, &childUnion,
						   &pWin->borderSize);
	    }
	    else
	    {
		pWin = pParent->lastChild;
		while (1)
		{
		    if (pWin->valdata && pWin->viewable)
			REGION_APPEND( pScreen, &childUnion,
						   &pWin->borderSize);
		    if (pWin == pChild)
			break;
		    pWin = pWin->prevSib;
		}
	    }
	    REGION_VALIDATE(pScreen, &childUnion, &overlap);
	    if (overlap)
		REGION_UNINIT(pScreen, &childUnion);
	}
    }

    for (pWin = pChild;
	 pWin != NullWindow;
	 pWin = pWin->nextSib)
    {
	if (pWin->viewable) {
	    if (pWin->valdata) {
		REGION_INTERSECT( pScreen, &childClip,
					&totalClip,
 					&pWin->borderSize);
		miComputeClips (pWin, pScreen, &childClip, kind, &exposed);
		if (overlap)
		{
		    REGION_SUBTRACT( pScreen, &totalClip,
				       	   &totalClip,
				       	   &pWin->borderSize);
		}
	    } else if (pWin->visibility == VisibilityNotViewable) {
		miTreeObscured(pWin);
	    }
	} else {
	    if (pWin->valdata) {
		REGION_EMPTY( pScreen, &pWin->clipList);
		if (pScreen->ClipNotify)
		    (* pScreen->ClipNotify) (pWin, 0, 0);
		REGION_EMPTY( pScreen, &pWin->borderClip);
		pWin->valdata = (ValidatePtr)NULL;
	    }
	}
    }

    REGION_UNINIT( pScreen, &childClip);
    if (!overlap)
    {
	REGION_SUBTRACT(pScreen, &totalClip, &totalClip, &childUnion);
	REGION_UNINIT(pScreen, &childUnion);
    }

    REGION_INIT( pScreen, &pParent->valdata->after.exposed, NullBox, 0);
    REGION_INIT( pScreen, &pParent->valdata->after.borderExposed, NullBox, 0);

    /*
     * each case below is responsible for updating the
     * clipList and serial number for the parent window
     */

    switch (kind) {
    case VTStack:
	break;
    default:
	/*
	 * totalClip contains the new clipList for the parent. Figure out
	 * exposures and obscures as per miComputeClips and reset the parent's
	 * clipList.
	 */
	REGION_SUBTRACT( pScreen, &pParent->valdata->after.exposed,
			       &totalClip, &pParent->clipList);
	/* fall through */
    case VTMap:
	if (pParent->backStorage) {
	    REGION_SUBTRACT( pScreen, &exposed, &pParent->clipList, &totalClip);
	    (* pScreen->SaveDoomedAreas)(pParent, &exposed, 0, 0);
	}
	
	REGION_COPY( pScreen, &pParent->clipList, &totalClip);
	pParent->drawable.serialNumber = NEXT_SERIAL_NUMBER;
	break;
    }

    REGION_UNINIT( pScreen, &totalClip);
    REGION_UNINIT( pScreen, &exposed);
    if (pScreen->ClipNotify)
	(*pScreen->ClipNotify) (pParent, 0, 0);
    return (1);
}