path: root/miext/rootless/rootlessValTree.c

/*
 * Calculate window clip lists for rootless mode
 *
 * This file is very closely based on mivaltree.c.
 */
/* $XFree86: xc/programs/Xserver/miext/rootless/rootlessValTree.c,v 1.1tsi Exp $ */

/*
 * mivaltree.c --
 *	Functions for recalculating window clip lists. Main function
 *	is miValidateTree.
 *

Copyright 1987, 1988, 1989, 1998  The Open Group

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The above copyright notice and this permission notice shall be included in
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in this Software without prior written authorization from The Open Group.

 *
 * Copyright 1987, 1988, 1989 by 
 * Digital Equipment Corporation, Maynard, Massachusetts,
 * 
 *                         All Rights Reserved
 * 
 * Permission to use, copy, modify, and distribute this software and its 
 * documentation for any purpose and without fee is hereby granted, 
 * provided that the above copyright notice appear in all copies and that
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 * 
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 * WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
 * ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 * 
 ******************************************************************/

/* The panoramix components contained the following notice */
/****************************************************************
*                                                               *
*    Copyright (c) Digital Equipment Corporation, 1991, 1997    *
*                                                               *
*   All Rights Reserved.  Unpublished rights  reserved  under   *
*   the copyright laws of the United States.                    *
*                                                               *
*   The software contained on this media  is  proprietary  to   *
*   and  embodies  the  confidential  technology  of  Digital   *
*   Equipment Corporation.  Possession, use,  duplication  or   *
*   dissemination of the software and media is authorized only  *
*   pursuant to a valid written license from Digital Equipment  *
*   Corporation.                                                *
*                                                               *
*   RESTRICTED RIGHTS LEGEND   Use, duplication, or disclosure  *
*   by the U.S. Government is subject to restrictions  as  set  *
*   forth in Subparagraph (c)(1)(ii)  of  DFARS  252.227-7013,  *
*   or  in  FAR 52.227-19, as applicable.                       *
*                                                               *
*****************************************************************/

 /* 
  * Aug '86: Susan Angebranndt -- original code
  * July '87: Adam de Boor -- substantially modified and commented
  * Summer '89: Joel McCormack -- so fast you wouldn't believe it possible.
  *             In particular, much improved code for window mapping and
  *             circulating.
  *		Bob Scheifler -- avoid miComputeClips for unmapped windows,
  *				 valdata changes
  */
#include    "X.h"
#include    "scrnintstr.h"
#include    "validate.h"
#include    "windowstr.h"
#include    "mi.h"
#include    "regionstr.h"
#include    "mivalidate.h"

#include    "globals.h"

#ifdef SHAPE
/*
 * Compute the visibility of a shaped window
 */
int
RootlessShapedWindowIn (pScreen, universe, bounding, rect, x, y)
    ScreenPtr	pScreen;
    RegionPtr	universe, bounding;
    BoxPtr	rect;
    register int x, y;
{
    BoxRec  box;
    register BoxPtr  boundBox;
    int	    nbox;
    Bool    someIn, someOut;
    register int t, x1, y1, x2, y2;

    nbox = REGION_NUM_RECTS (bounding);
    boundBox = REGION_RECTS (bounding);
    someIn = someOut = FALSE;
    x1 = rect->x1;
    y1 = rect->y1;
    x2 = rect->x2;
    y2 = rect->y2;
    while (nbox--)
    {
	if ((t = boundBox->x1 + x) < x1)
	    t = x1;
	box.x1 = t;
	if ((t = boundBox->y1 + y) < y1)
	    t = y1;
	box.y1 = t;
	if ((t = boundBox->x2 + x) > x2)
	    t = x2;
	box.x2 = t;
	if ((t = boundBox->y2 + y) > y2)
	    t = y2;
	box.y2 = t;
	if (box.x1 > box.x2)
	    box.x2 = box.x1;
	if (box.y1 > box.y2)
	    box.y2 = box.y1;
	switch (RECT_IN_REGION(pScreen, universe, &box))
	{
	case rgnIN:
	    if (someOut)
		return rgnPART;
	    someIn = TRUE;
	    break;
	case rgnOUT:
	    if (someIn)
		return rgnPART;
	    someOut = TRUE;
	    break;
	default:
	    return rgnPART;
	}
	boundBox++;
    }
    if (someIn)
	return rgnIN;
    return rgnOUT;
}
#endif

#define HasParentRelativeBorder(w) (!(w)->borderIsPixel && \
				    HasBorder(w) && \
				    (w)->backgroundState == ParentRelative)


/*
 *-----------------------------------------------------------------------
 * RootlessComputeClips --
 *	Recompute the clipList, borderClip, exposed and borderExposed
 *	regions for pParent and its children. Only viewable windows are
 *	taken into account.
 *
 * Results:
 *	None.
 *
 * Side Effects:
 *	clipList, borderClip, exposed and borderExposed are altered.
 *	A VisibilityNotify event may be generated on the parent window.
 *
 *-----------------------------------------------------------------------
 */
static void
RootlessComputeClips (pParent, pScreen, universe, kind, exposed)
    register WindowPtr	pParent;
    register ScreenPtr	pScreen;
    register RegionPtr	universe;
    VTKind		kind;
    RegionPtr		exposed; /* for intermediate calculations */
{
    int			dx,
			dy;
    RegionRec		childUniverse;
    register WindowPtr	pChild;
    int     	  	oldVis, newVis;
    BoxRec		borderSize;
    RegionRec		childUnion;
    Bool		overlap;
    RegionPtr		borderVisible;
    Bool		resized;
    /*
     * Figure out the new visibility of this window.
     * The extent of the universe should be the same as the extent of
     * the borderSize region. If the window is unobscured, this rectangle
     * will be completely inside the universe (the universe will cover it
     * completely). If the window is completely obscured, none of the
     * universe will cover the rectangle.
     */
    borderSize.x1 = pParent->drawable.x - wBorderWidth(pParent);
    borderSize.y1 = pParent->drawable.y - wBorderWidth(pParent);
    dx = (int) pParent->drawable.x + (int) pParent->drawable.width + wBorderWidth(pParent);
    if (dx > 32767)
	dx = 32767;
    borderSize.x2 = dx;
    dy = (int) pParent->drawable.y + (int) pParent->drawable.height + wBorderWidth(pParent);
    if (dy > 32767)
	dy = 32767;
    borderSize.y2 = dy;

    oldVis = pParent->visibility;
    switch (RECT_IN_REGION( pScreen, universe, &borderSize)) 
    {
    case rgnIN:
	    newVis = VisibilityUnobscured;
	    break;
	case rgnPART:
	    newVis = VisibilityPartiallyObscured;
#ifdef SHAPE
	    {
		RegionPtr   pBounding;

		if ((pBounding = wBoundingShape (pParent)))
		{
		    switch (RootlessShapedWindowIn (pScreen, universe, 
						    pBounding, &borderSize,
						    pParent->drawable.x,
						    pParent->drawable.y))
		    {
		    case rgnIN:
			newVis = VisibilityUnobscured;
			break;
		    case rgnOUT:
			newVis = VisibilityFullyObscured;
			break;
		    }
		}
	    }
#endif
	    break;
	default:
	    newVis = VisibilityFullyObscured;
	    break;
    }

    pParent->visibility = newVis;
    if (oldVis != newVis &&
	((pParent->eventMask | wOtherEventMasks(pParent)) & VisibilityChangeMask))
	SendVisibilityNotify(pParent);

    dx = pParent->drawable.x - pParent->valdata->before.oldAbsCorner.x;
    dy = pParent->drawable.y - pParent->valdata->before.oldAbsCorner.y;

    /*
     * avoid computations when dealing with simple operations
     */

    switch (kind) {
    case VTMap:
    case VTStack:
    case VTUnmap:
	break;
    case VTMove:
	if ((oldVis == newVis) &&
	    ((oldVis == VisibilityFullyObscured) ||
	     (oldVis == VisibilityUnobscured)))
	{
	    pChild = pParent;
	    while (1)
	    {
		if (pChild->viewable)
		{
		    if (pChild->visibility != VisibilityFullyObscured)
		    {
			REGION_TRANSLATE( pScreen, &pChild->borderClip,
						      dx, dy);
			REGION_TRANSLATE( pScreen, &pChild->clipList,
						      dx, dy);
			pChild->drawable.serialNumber = NEXT_SERIAL_NUMBER;
			if (pScreen->ClipNotify)
			    (* pScreen->ClipNotify) (pChild, dx, dy);

		    }
		    if (pChild->valdata)
		    {
			REGION_NULL(pScreen,
				    &pChild->valdata->after.borderExposed);
			if (HasParentRelativeBorder(pChild))
			  {
			    REGION_SUBTRACT(pScreen,
					 &pChild->valdata->after.borderExposed,
					 &pChild->borderClip,
					 &pChild->winSize);
			}
			REGION_NULL(pScreen, &pChild->valdata->after.exposed);
		    }
		    if (pChild->firstChild)
		    {
			pChild = pChild->firstChild;
			continue;
		    }
		}
		while (!pChild->nextSib && (pChild != pParent))
		    pChild = pChild->parent;
		if (pChild == pParent)
		    break;
		pChild = pChild->nextSib;
	    }
	    return;
	}
	/* fall through */
    default:
    	/*
     	 * To calculate exposures correctly, we have to translate the old
     	 * borderClip and clipList regions to the window's new location so there
     	 * is a correspondence between pieces of the new and old clipping regions.
     	 */
    	if (dx || dy) 
    	{
	    /*
	     * We translate the old clipList because that will be exposed or copied
	     * if gravity is right.
	     */
	    REGION_TRANSLATE( pScreen, &pParent->borderClip, dx, dy);
	    REGION_TRANSLATE( pScreen, &pParent->clipList, dx, dy);
    	} 
	break;
    case VTBroken:
	REGION_EMPTY (pScreen, &pParent->borderClip);
	REGION_EMPTY (pScreen, &pParent->clipList);
	break;
    }

    borderVisible = pParent->valdata->before.borderVisible;
    resized = pParent->valdata->before.resized;
    REGION_NULL(pScreen, &pParent->valdata->after.borderExposed);
    REGION_NULL(pScreen, &pParent->valdata->after.exposed);

    /*
     * Since the borderClip must not be clipped by the children, we do
     * the border exposure first...
     *
     * 'universe' is the window's borderClip. To figure the exposures, remove
     * the area that used to be exposed from the new.
     * This leaves a region of pieces that weren't exposed before.
     */

    if (HasBorder (pParent))
    {
    	if (borderVisible)
    	{
	    /*
	     * when the border changes shape, the old visible portions
	     * of the border will be saved by DIX in borderVisible --
	     * use that region and destroy it
	     */
	    REGION_SUBTRACT( pScreen, exposed, universe, borderVisible);
	    REGION_DESTROY( pScreen, borderVisible);
    	}
    	else
    	{
	    REGION_SUBTRACT( pScreen, exposed, universe, &pParent->borderClip);
    	}
	if (HasParentRelativeBorder(pParent) && (dx || dy)) {
	    REGION_SUBTRACT( pScreen, &pParent->valdata->after.borderExposed,
				  universe,
				  &pParent->winSize);
	} else {
	    REGION_SUBTRACT( pScreen, &pParent->valdata->after.borderExposed,
			       exposed, &pParent->winSize);
	}

    	REGION_COPY( pScreen, &pParent->borderClip, universe);
    
    	/*
     	 * To get the right clipList for the parent, and to make doubly sure
     	 * that no child overlaps the parent's border, we remove the parent's
     	 * border from the universe before proceeding.
     	 */
    
    	REGION_INTERSECT( pScreen, universe, universe, &pParent->winSize);
    }
    else
    	REGION_COPY( pScreen, &pParent->borderClip, universe);
    
    if ((pChild = pParent->firstChild) && pParent->mapped)
    {
	REGION_NULL(pScreen, &childUniverse);
	REGION_NULL(pScreen, &childUnion);
	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);
		    RootlessComputeClips (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
RootlessTreeObscured(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;
    }
}

/*
 *-----------------------------------------------------------------------
 * RootlessMiValidateTree --
 *	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...
 *
 *-----------------------------------------------------------------------
 */
/* 
   Quartz version: used for validate from root in rootless mode.
   We need to make sure top-level windows don't clip each other, 
   and that top-level windows aren't clipped to the root window.
*/
/*ARGSUSED*/
// fixme this is ugly
// Xprint/ValTree.c doesn't work, but maybe that method can?
int
RootlessMiValidateTree (pRoot, pChild, kind)
    WindowPtr	  	pRoot;      /* Parent to validate */
    WindowPtr	  	pChild;     /* First child of pRoot that was
				     * affected */
    VTKind    	  	kind;       /* What kind of configuration caused call */
{
    RegionRec	  	childClip;  /* The new borderClip for the current
				     * child */
    RegionRec		exposed;    /* For intermediate calculations */
    register ScreenPtr	pScreen;
    register WindowPtr	pWin;

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

    REGION_NULL(pScreen, &childClip);
    REGION_NULL(pScreen, &exposed);

    if (REGION_BROKEN (pScreen, &pRoot->clipList) &&
	!REGION_BROKEN (pScreen, &pRoot->borderClip))
    {
        // fixme this might not work, but hopefully doesn't happen anyway.
        kind = VTBroken;
        REGION_EMPTY (pScreen, &pRoot->clipList);
        ErrorF("ValidateTree: BUSTED!\n");
    }

    /* 
     * Recursively compute the clips for all children of the root. 
     * They don't clip against each other or the root itself, so 
     * childClip is always reset to that child's size.
     */

    for (pWin = pChild;
	 pWin != NullWindow;
	 pWin = pWin->nextSib)
    {
        if (pWin->viewable) {
            if (pWin->valdata) {
                REGION_COPY( pScreen, &childClip, &pWin->borderSize);
                RootlessComputeClips (pWin, pScreen, &childClip, kind, &exposed);
            } else if (pWin->visibility == VisibilityNotViewable) {
                RootlessTreeObscured(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);

    /* The root is never clipped by its children, so nothing on the root 
       is ever exposed by moving or mapping its children. */
    REGION_NULL(pScreen, &pRoot->valdata->after.exposed);
    REGION_NULL(pScreen, &pRoot->valdata->after.borderExposed);

    return 1;
}