xref: /dports/x11-wm/compiz/compiz-0.8.8/src/window.c

/*
 * Copyright © 2005 Novell, Inc.
 *
 * Permission to use, copy, modify, distribute, and sell this software
 * and its documentation for any purpose is hereby granted without
 * fee, provided that the above copyright notice appear in all copies
 * and that both that copyright notice and this permission notice
 * appear in supporting documentation, and that the name of
 * Novell, Inc. not be used in advertising or publicity pertaining to
 * distribution of the software without specific, written prior permission.
 * Novell, Inc. makes no representations about the suitability of this
 * software for any purpose. It is provided "as is" without express or
 * implied warranty.
 *
 * NOVELL, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
 * NO EVENT SHALL NOVELL, INC. BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
 * OF USE, DATA OR PROFITS, 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.
 *
 * Author: David Reveman <davidr@novell.com>
 */

#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <X11/Xproto.h>
#include <X11/extensions/shape.h>
#include <X11/extensions/Xcomposite.h>

#include <stdio.h>
#include <string.h>
#include <strings.h>
#include <stdlib.h>
#include <stdint.h>
#include <assert.h>

#include <compiz-core.h>

#define MwmHintsFunctions   (1L << 0)
#define MwmHintsDecorations (1L << 1)

#define PropMotifWmHintElements 3

typedef struct {
    unsigned long flags;
    unsigned long functions;
    unsigned long decorations;
} MwmHints;

static int
reallocWindowPrivates (int  size,
		       void *closure)
{
    CompScreen *s = (CompScreen *) closure;
    CompWindow *w;
    void       *privates;

    for (w = s->windows; w; w = w->next)
    {
	privates = realloc (w->base.privates, size * sizeof (CompPrivate));
	if (!privates)
	    return FALSE;

	w->base.privates = (CompPrivate *) privates;
    }

    return TRUE;
}

int
allocWindowObjectPrivateIndex (CompObject *parent)
{
    CompScreen *screen = (CompScreen *) parent;

    return allocatePrivateIndex (&screen->windowPrivateLen,
				 &screen->windowPrivateIndices,
				 reallocWindowPrivates,
				 (void *) screen);
}

void
freeWindowObjectPrivateIndex (CompObject *parent,
			      int	 index)
{
    CompScreen *screen = (CompScreen *) parent;

    freePrivateIndex (screen->windowPrivateLen,
		      screen->windowPrivateIndices,
		      index);
}

CompBool
forEachWindowObject (CompObject	        *parent,
		     ObjectCallBackProc proc,
		     void	        *closure)
{
    if (parent->type == COMP_OBJECT_TYPE_SCREEN)
    {
	CompWindow *w;

	CORE_SCREEN (parent);

	for (w = s->windows; w; w = w->next)
	{
	    if (!(*proc) (&w->base, closure))
		return FALSE;
	}
    }

    return TRUE;
}

char *
nameWindowObject (CompObject *object)
{
    char tmp[256];

    CORE_WINDOW (object);

    snprintf (tmp, 256, "0x%lu", w->id);

    return strdup (tmp);
}

CompObject *
findWindowObject (CompObject *parent,
		  const char *name)
{
    if (parent->type == COMP_OBJECT_TYPE_SCREEN)
    {
	CompWindow *w;
	Window	   id = atoi (name);

	CORE_SCREEN (parent);

	for (w = s->windows; w; w = w->next)
	    if (w->id == id)
		return &w->base;
    }

    return NULL;
}

int
allocateWindowPrivateIndex (CompScreen *screen)
{
    return compObjectAllocatePrivateIndex (&screen->base,
					   COMP_OBJECT_TYPE_WINDOW);
}

void
freeWindowPrivateIndex (CompScreen *screen,
			int	   index)
{
    compObjectFreePrivateIndex (&screen->base,
				COMP_OBJECT_TYPE_WINDOW,
				index);
}

static Bool
isAncestorTo (CompWindow *transient,
	      CompWindow *ancestor)
{
    if (transient->transientFor)
    {
	if (transient->transientFor == ancestor->id)
	    return TRUE;

	transient = findWindowAtScreen (transient->screen,
					transient->transientFor);
	if (transient)
	    return isAncestorTo (transient, ancestor);
    }

    return FALSE;
}

static void
recalcNormalHints (CompWindow *window)
{
    int maxSize;

    maxSize = window->screen->maxTextureSize;
    maxSize -= window->serverBorderWidth * 2;

    window->sizeHints.x      = window->serverX;
    window->sizeHints.y      = window->serverY;
    window->sizeHints.width  = window->serverWidth;
    window->sizeHints.height = window->serverHeight;

    if (!(window->sizeHints.flags & PBaseSize))
    {
	if (window->sizeHints.flags & PMinSize)
	{
	    window->sizeHints.base_width  = window->sizeHints.min_width;
	    window->sizeHints.base_height = window->sizeHints.min_height;
	}
	else
	{
	    window->sizeHints.base_width  = 0;
	    window->sizeHints.base_height = 0;
	}

	window->sizeHints.flags |= PBaseSize;
    }

    if (!(window->sizeHints.flags & PMinSize))
    {
	window->sizeHints.min_width  = window->sizeHints.base_width;
	window->sizeHints.min_height = window->sizeHints.base_height;
	window->sizeHints.flags |= PMinSize;
    }

    if (!(window->sizeHints.flags & PMaxSize))
    {
	window->sizeHints.max_width  = 65535;
	window->sizeHints.max_height = 65535;
	window->sizeHints.flags |= PMaxSize;
    }

    if (window->sizeHints.max_width < window->sizeHints.min_width)
	window->sizeHints.max_width = window->sizeHints.min_width;

    if (window->sizeHints.max_height < window->sizeHints.min_height)
	window->sizeHints.max_height = window->sizeHints.min_height;

    if (window->sizeHints.min_width < 1)
	window->sizeHints.min_width = 1;

    if (window->sizeHints.max_width < 1)
	window->sizeHints.max_width = 1;

    if (window->sizeHints.min_height < 1)
	window->sizeHints.min_height = 1;

    if (window->sizeHints.max_height < 1)
	window->sizeHints.max_height = 1;

    if (window->sizeHints.max_width > maxSize)
	window->sizeHints.max_width = maxSize;

    if (window->sizeHints.max_height > maxSize)
	window->sizeHints.max_height = maxSize;

    if (window->sizeHints.min_width > maxSize)
	window->sizeHints.min_width = maxSize;

    if (window->sizeHints.min_height > maxSize)
	window->sizeHints.min_height = maxSize;

    if (window->sizeHints.base_width > maxSize)
	window->sizeHints.base_width = maxSize;

    if (window->sizeHints.base_height > maxSize)
	window->sizeHints.base_height = maxSize;

    if (window->sizeHints.flags & PResizeInc)
    {
	if (window->sizeHints.width_inc == 0)
	    window->sizeHints.width_inc = 1;

	if (window->sizeHints.height_inc == 0)
	    window->sizeHints.height_inc = 1;
    }
    else
    {
	window->sizeHints.width_inc  = 1;
	window->sizeHints.height_inc = 1;
	window->sizeHints.flags |= PResizeInc;
    }

    if (window->sizeHints.flags & PAspect)
    {
	/* don't divide by 0 */
	if (window->sizeHints.min_aspect.y < 1)
	    window->sizeHints.min_aspect.y = 1;

	if (window->sizeHints.max_aspect.y < 1)
	    window->sizeHints.max_aspect.y = 1;
    }
    else
    {
	window->sizeHints.min_aspect.x = 1;
	window->sizeHints.min_aspect.y = 65535;
	window->sizeHints.max_aspect.x = 65535;
	window->sizeHints.max_aspect.y = 1;
	window->sizeHints.flags |= PAspect;
    }

    if (!(window->sizeHints.flags & PWinGravity))
    {
	window->sizeHints.win_gravity = NorthWestGravity;
	window->sizeHints.flags |= PWinGravity;
    }
}

void
updateNormalHints (CompWindow *w)
{
    Status status;
    long   supplied;

    status = XGetWMNormalHints (w->screen->display->display, w->id,
				&w->sizeHints, &supplied);

    if (!status)
	w->sizeHints.flags = 0;

    recalcNormalHints (w);
}

void
updateWmHints (CompWindow *w)
{
    XWMHints *hints;
    long     dFlags = 0;
    Bool     iconChanged = FALSE;

    if (w->hints)
	dFlags = w->hints->flags;

    w->inputHint = TRUE;

    hints = XGetWMHints (w->screen->display->display, w->id);
    if (hints)
    {
	dFlags ^= hints->flags;

	if (hints->flags & InputHint)
	    w->inputHint = hints->input;

	if (w->hints)
	{
	    if ((hints->flags & IconPixmapHint) &&
		(w->hints->icon_pixmap != hints->icon_pixmap))
	    {
		iconChanged = TRUE;
	    }
	    else if ((hints->flags & IconMaskHint) &&
		     (w->hints->icon_mask != hints->icon_mask))
	    {
		iconChanged = TRUE;
	    }
	}
    }

    iconChanged |= (dFlags & (IconPixmapHint | IconMaskHint));

    if (iconChanged)
	freeWindowIcons (w);

    if (w->hints)
	XFree (w->hints);

    w->hints = hints;
}

void
updateWindowClassHints (CompWindow *w)
{
    XClassHint classHint;
    int	       status;

    if (w->resName)
    {
	free (w->resName);
	w->resName = NULL;
    }

    if (w->resClass)
    {
	free (w->resClass);
	w->resClass = NULL;
    }

    status = XGetClassHint (w->screen->display->display, w->id, &classHint);
    if (status)
    {
	if (classHint.res_name)
	{
	    w->resName = strdup (classHint.res_name);
	    XFree (classHint.res_name);
	}

	if (classHint.res_class)
	{
	    w->resClass = strdup (classHint.res_class);
	    XFree (classHint.res_class);
	}
    }
}

void
updateTransientHint (CompWindow *w)
{
    Window transientFor;
    Status status;

    w->transientFor = None;

    status = XGetTransientForHint (w->screen->display->display,
				   w->id, &transientFor);

    if (status)
    {
	CompWindow *ancestor;

	ancestor = findWindowAtScreen (w->screen, transientFor);
	if (!ancestor)
	    return;

	/* protect against circular transient dependencies */
	if (transientFor == w->id || isAncestorTo (ancestor, w))
	    return;

	w->transientFor = transientFor;
    }
}

void
updateIconGeometry (CompWindow *w)
{
    Atom	  actual;
    int		  result, format;
    unsigned long n, left;
    unsigned char *data;

    result = XGetWindowProperty (w->screen->display->display, w->id,
				 w->screen->display->wmIconGeometryAtom,
				 0L, 1024L, False, XA_CARDINAL,
				 &actual, &format, &n, &left, &data);

    w->iconGeometrySet = FALSE;

    if (result == Success && data)
    {
	if (n == 4)
	{
	    unsigned long *geometry = (unsigned long *) data;

	    w->iconGeometry.x      = geometry[0];
	    w->iconGeometry.y      = geometry[1];
	    w->iconGeometry.width  = geometry[2];
	    w->iconGeometry.height = geometry[3];

	    w->iconGeometrySet = TRUE;
	}

	XFree (data);
    }
}

static Window
getClientLeaderOfAncestor (CompWindow *w)
{
    if (w->transientFor)
    {
	w = findWindowAtScreen (w->screen, w->transientFor);
	if (w)
	{
	    if (w->clientLeader)
		return w->clientLeader;

	    return getClientLeaderOfAncestor (w);
	}
    }

    return None;
}

Window
getClientLeader (CompWindow *w)
{
    Atom	  actual;
    int		  result, format;
    unsigned long n, left;
    unsigned char *data;

    result = XGetWindowProperty (w->screen->display->display, w->id,
				 w->screen->display->wmClientLeaderAtom,
				 0L, 1L, False, XA_WINDOW, &actual, &format,
				 &n, &left, &data);

    if (result == Success && data)
    {
	Window win = None;

	if (n)
	    memcpy (&win, data, sizeof (Window));
	XFree ((void *) data);

	if (win)
	    return win;
    }

    return getClientLeaderOfAncestor (w);
}

char *
getStartupId (CompWindow *w)
{
    Atom	  actual;
    int		  result, format;
    unsigned long n, left;
    unsigned char *data;

    result = XGetWindowProperty (w->screen->display->display, w->id,
				 w->screen->display->startupIdAtom,
				 0L, 1024L, False,
				 w->screen->display->utf8StringAtom,
				 &actual, &format,
				 &n, &left, &data);

    if (result == Success && data)
    {
	char *id = NULL;

	if (n)
	    id = strdup ((char *) data);
	XFree ((void *) data);

	return id;
    }

    return NULL;
}

int
getWmState (CompDisplay *display,
	    Window      id)
{
    Atom	  actual;
    int		  result, format;
    unsigned long n, left;
    unsigned char *data;
    unsigned long state = NormalState;

    result = XGetWindowProperty (display->display, id,
				 display->wmStateAtom, 0L, 2L, FALSE,
				 display->wmStateAtom, &actual, &format,
				 &n, &left, &data);

    if (result == Success && data)
    {
	if (n)
	    memcpy (&state, data, sizeof (unsigned long));
	XFree ((void *) data);
    }

    return state;
}

void
setWmState (CompDisplay *display,
	    int		state,
	    Window      id)
{
    unsigned long data[2];

    data[0] = state;
    data[1] = None;

    XChangeProperty (display->display, id,
		     display->wmStateAtom, display->wmStateAtom,
		     32, PropModeReplace, (unsigned char *) data, 2);
}

unsigned int
windowStateMask (CompDisplay *display,
		 Atom	     state)
{
    if (state == display->winStateModalAtom)
	return CompWindowStateModalMask;
    else if (state == display->winStateStickyAtom)
	return CompWindowStateStickyMask;
    else if (state == display->winStateMaximizedVertAtom)
	return CompWindowStateMaximizedVertMask;
    else if (state == display->winStateMaximizedHorzAtom)
	return CompWindowStateMaximizedHorzMask;
    else if (state == display->winStateShadedAtom)
	return CompWindowStateShadedMask;
    else if (state == display->winStateSkipTaskbarAtom)
	return CompWindowStateSkipTaskbarMask;
    else if (state == display->winStateSkipPagerAtom)
	return CompWindowStateSkipPagerMask;
    else if (state == display->winStateHiddenAtom)
	return CompWindowStateHiddenMask;
    else if (state == display->winStateFullscreenAtom)
	return CompWindowStateFullscreenMask;
    else if (state == display->winStateAboveAtom)
	return CompWindowStateAboveMask;
    else if (state == display->winStateBelowAtom)
	return CompWindowStateBelowMask;
    else if (state == display->winStateDemandsAttentionAtom)
	return CompWindowStateDemandsAttentionMask;
    else if (state == display->winStateDisplayModalAtom)
	return CompWindowStateDisplayModalMask;

    return 0;
}

unsigned int
windowStateFromString (const char *str)
{
    if (strcasecmp (str, "modal") == 0)
	return CompWindowStateModalMask;
    else if (strcasecmp (str, "sticky") == 0)
	return CompWindowStateStickyMask;
    else if (strcasecmp (str, "maxvert") == 0)
	return CompWindowStateMaximizedVertMask;
    else if (strcasecmp (str, "maxhorz") == 0)
	return CompWindowStateMaximizedHorzMask;
    else if (strcasecmp (str, "shaded") == 0)
	return CompWindowStateShadedMask;
    else if (strcasecmp (str, "skiptaskbar") == 0)
	return CompWindowStateSkipTaskbarMask;
    else if (strcasecmp (str, "skippager") == 0)
	return CompWindowStateSkipPagerMask;
    else if (strcasecmp (str, "hidden") == 0)
	return CompWindowStateHiddenMask;
    else if (strcasecmp (str, "fullscreen") == 0)
	return CompWindowStateFullscreenMask;
    else if (strcasecmp (str, "above") == 0)
	return CompWindowStateAboveMask;
    else if (strcasecmp (str, "below") == 0)
	return CompWindowStateBelowMask;
    else if (strcasecmp (str, "demandsattention") == 0)
	return CompWindowStateDemandsAttentionMask;

    return 0;
}

unsigned int
getWindowState (CompDisplay *display,
		Window      id)
{
    Atom	  actual;
    int		  result, format;
    unsigned long n, left;
    unsigned char *data;
    unsigned int  state = 0;

    result = XGetWindowProperty (display->display, id, display->winStateAtom,
				 0L, 1024L, FALSE, XA_ATOM, &actual, &format,
				 &n, &left, &data);

    if (result == Success && data)
    {
	Atom *a = (Atom *) data;

	while (n--)
	    state |= windowStateMask (display, *a++);

	XFree ((void *) data);
    }

    return state;
}

void
setWindowState (CompDisplay  *display,
		unsigned int state,
		Window       id)
{
    Atom data[32];
    int	 i = 0;

    if (state & CompWindowStateModalMask)
	data[i++] = display->winStateModalAtom;
    if (state & CompWindowStateStickyMask)
	data[i++] = display->winStateStickyAtom;
    if (state & CompWindowStateMaximizedVertMask)
	data[i++] = display->winStateMaximizedVertAtom;
    if (state & CompWindowStateMaximizedHorzMask)
	data[i++] = display->winStateMaximizedHorzAtom;
    if (state & CompWindowStateShadedMask)
	data[i++] = display->winStateShadedAtom;
    if (state & CompWindowStateSkipTaskbarMask)
	data[i++] = display->winStateSkipTaskbarAtom;
    if (state & CompWindowStateSkipPagerMask)
	data[i++] = display->winStateSkipPagerAtom;
    if (state & CompWindowStateHiddenMask)
	data[i++] = display->winStateHiddenAtom;
    if (state & CompWindowStateFullscreenMask)
	data[i++] = display->winStateFullscreenAtom;
    if (state & CompWindowStateAboveMask)
	data[i++] = display->winStateAboveAtom;
    if (state & CompWindowStateBelowMask)
	data[i++] = display->winStateBelowAtom;
    if (state & CompWindowStateDemandsAttentionMask)
	data[i++] = display->winStateDemandsAttentionAtom;
    if (state & CompWindowStateDisplayModalMask)
	data[i++] = display->winStateDisplayModalAtom;

    XChangeProperty (display->display, id, display->winStateAtom,
		     XA_ATOM, 32, PropModeReplace,
		     (unsigned char *) data, i);
}

void
changeWindowState (CompWindow   *w,
		   unsigned int newState)
{
    CompDisplay  *d = w->screen->display;
    unsigned int oldState;

    if (w->state == newState)
	return;

    oldState = w->state;
    w->state = newState;

    recalcWindowType (w);
    recalcWindowActions (w);

    if (w->managed)
	setWindowState (d, w->state, w->id);

    (*w->screen->windowStateChangeNotify) (w, oldState);
    (*d->matchPropertyChanged) (d, w);
}

static void
setWindowActions (CompDisplay  *display,
		  unsigned int actions,
		  Window       id)
{
    Atom data[32];
    int	 i = 0;

    if (actions & CompWindowActionMoveMask)
	data[i++] = display->winActionMoveAtom;
    if (actions & CompWindowActionResizeMask)
	data[i++] = display->winActionResizeAtom;
    if (actions & CompWindowActionStickMask)
	data[i++] = display->winActionStickAtom;
    if (actions & CompWindowActionMinimizeMask)
	data[i++] = display->winActionMinimizeAtom;
    if (actions & CompWindowActionMaximizeHorzMask)
	data[i++] = display->winActionMaximizeHorzAtom;
    if (actions & CompWindowActionMaximizeVertMask)
	data[i++] = display->winActionMaximizeVertAtom;
    if (actions & CompWindowActionFullscreenMask)
	data[i++] = display->winActionFullscreenAtom;
    if (actions & CompWindowActionCloseMask)
	data[i++] = display->winActionCloseAtom;
    if (actions & CompWindowActionShadeMask)
	data[i++] = display->winActionShadeAtom;
    if (actions & CompWindowActionChangeDesktopMask)
	data[i++] = display->winActionChangeDesktopAtom;
    if (actions & CompWindowActionAboveMask)
	data[i++] = display->winActionAboveAtom;
    if (actions & CompWindowActionBelowMask)
	data[i++] = display->winActionBelowAtom;

    XChangeProperty (display->display, id, display->wmAllowedActionsAtom,
		     XA_ATOM, 32, PropModeReplace,
		     (unsigned char *) data, i);
}

void
recalcWindowActions (CompWindow *w)
{
    unsigned int actions = 0;
    unsigned int setActions, clearActions;

    switch (w->type) {
    case CompWindowTypeFullscreenMask:
    case CompWindowTypeNormalMask:
	actions =
	    CompWindowActionMaximizeHorzMask |
	    CompWindowActionMaximizeVertMask |
	    CompWindowActionFullscreenMask   |
	    CompWindowActionMoveMask         |
	    CompWindowActionResizeMask       |
	    CompWindowActionStickMask        |
	    CompWindowActionMinimizeMask     |
	    CompWindowActionCloseMask	     |
	    CompWindowActionChangeDesktopMask;
	break;
    case CompWindowTypeUtilMask:
    case CompWindowTypeMenuMask:
    case CompWindowTypeToolbarMask:
	actions =
	    CompWindowActionMoveMask   |
	    CompWindowActionResizeMask |
	    CompWindowActionStickMask  |
	    CompWindowActionCloseMask  |
	    CompWindowActionChangeDesktopMask;
	break;
    case CompWindowTypeDialogMask:
    case CompWindowTypeModalDialogMask:
	actions =
	    CompWindowActionMaximizeHorzMask |
	    CompWindowActionMaximizeVertMask |
	    CompWindowActionMoveMask         |
	    CompWindowActionResizeMask       |
	    CompWindowActionStickMask        |
	    CompWindowActionCloseMask        |
	    CompWindowActionChangeDesktopMask;

	/* allow minimization for dialog windows if they
	   a) are not a transient (transients can be minimized
	      with their parent)
	   b) don't have the skip taskbar hint set (as those
	      have no target to be minimized to)
	*/
	if (!w->transientFor &&
	    !(w->state & CompWindowStateSkipTaskbarMask))
	{
	    actions |= CompWindowActionMinimizeMask;
	}
    default:
	break;
    }

    if (w->input.top)
	actions |= CompWindowActionShadeMask;

    actions |= (CompWindowActionAboveMask | CompWindowActionBelowMask);

    switch (w->wmType) {
    case CompWindowTypeNormalMask:
	actions |= CompWindowActionFullscreenMask |
	           CompWindowActionMinimizeMask;
    default:
	break;
    }

    if (w->sizeHints.min_width  == w->sizeHints.max_width &&
	w->sizeHints.min_height == w->sizeHints.max_height)
	actions &= ~(CompWindowActionResizeMask	      |
		     CompWindowActionMaximizeHorzMask |
		     CompWindowActionMaximizeVertMask |
		     CompWindowActionFullscreenMask);

    if (!(w->mwmFunc & MwmFuncAll))
    {
	if (!(w->mwmFunc & MwmFuncResize))
	    actions &= ~(CompWindowActionResizeMask	  |
			 CompWindowActionMaximizeHorzMask |
			 CompWindowActionMaximizeVertMask |
			 CompWindowActionFullscreenMask);

	if (!(w->mwmFunc & MwmFuncMove))
	    actions &= ~(CompWindowActionMoveMask	  |
			 CompWindowActionMaximizeHorzMask |
			 CompWindowActionMaximizeVertMask |
			 CompWindowActionFullscreenMask);

	if (!(w->mwmFunc & MwmFuncIconify))
	    actions &= ~CompWindowActionMinimizeMask;

	if (!(w->mwmFunc & MwmFuncClose))
	    actions &= ~CompWindowActionCloseMask;
    }

    (*w->screen->getAllowedActionsForWindow) (w, &setActions, &clearActions);
    actions &= ~clearActions;
    actions |= setActions;

    if (actions != w->actions)
    {
	w->actions = actions;
	setWindowActions (w->screen->display, actions, w->id);
    }
}

void
getAllowedActionsForWindow (CompWindow   *w,
			    unsigned int *setActions,
			    unsigned int *clearActions)
{
    *setActions   = 0;
    *clearActions = 0;
}

unsigned int
constrainWindowState (unsigned int state,
		      unsigned int actions)
{
    if (!(actions & CompWindowActionMaximizeHorzMask))
	state &= ~CompWindowStateMaximizedHorzMask;

    if (!(actions & CompWindowActionMaximizeVertMask))
	state &= ~CompWindowStateMaximizedVertMask;

    if (!(actions & CompWindowActionShadeMask))
	state &= ~CompWindowStateShadedMask;

    if (!(actions & CompWindowActionFullscreenMask))
	state &= ~CompWindowStateFullscreenMask;

    return state;
}

unsigned int
windowTypeFromString (const char *str)
{
    if (strcasecmp (str, "desktop") == 0)
	return CompWindowTypeDesktopMask;
    else if (strcasecmp (str, "dock") == 0)
	return CompWindowTypeDockMask;
    else if (strcasecmp (str, "toolbar") == 0)
	return CompWindowTypeToolbarMask;
    else if (strcasecmp (str, "menu") == 0)
	return CompWindowTypeMenuMask;
    else if (strcasecmp (str, "utility") == 0)
	return CompWindowTypeUtilMask;
    else if (strcasecmp (str, "splash") == 0)
	return CompWindowTypeSplashMask;
    else if (strcasecmp (str, "dialog") == 0)
	return CompWindowTypeDialogMask;
    else if (strcasecmp (str, "normal") == 0)
	return CompWindowTypeNormalMask;
    else if (strcasecmp (str, "dropdownmenu") == 0)
	return CompWindowTypeDropdownMenuMask;
    else if (strcasecmp (str, "popupmenu") == 0)
	return CompWindowTypePopupMenuMask;
    else if (strcasecmp (str, "tooltip") == 0)
	return CompWindowTypeTooltipMask;
    else if (strcasecmp (str, "notification") == 0)
	return CompWindowTypeNotificationMask;
    else if (strcasecmp (str, "combo") == 0)
	return CompWindowTypeComboMask;
    else if (strcasecmp (str, "dnd") == 0)
	return CompWindowTypeDndMask;
    else if (strcasecmp (str, "modaldialog") == 0)
	return CompWindowTypeModalDialogMask;
    else if (strcasecmp (str, "fullscreen") == 0)
	return CompWindowTypeFullscreenMask;
    else if (strcasecmp (str, "unknown") == 0)
	return CompWindowTypeUnknownMask;
    else if (strcasecmp (str, "any") == 0)
	return ~0;

    return 0;
}

unsigned int
getWindowType (CompDisplay *display,
	       Window      id)
{
    Atom	  actual, a = None;
    int		  result, format;
    unsigned long n, left;
    unsigned char *data;

    result = XGetWindowProperty (display->display, id, display->winTypeAtom,
				 0L, 1L, FALSE, XA_ATOM, &actual, &format,
				 &n, &left, &data);

    if (result == Success && data)
    {
	if (n)
	    memcpy (&a, data, sizeof (Atom));

	XFree ((void *) data);
    }

    if (a)
    {
	if (a == display->winTypeNormalAtom)
	    return CompWindowTypeNormalMask;
	else if (a == display->winTypeMenuAtom)
	    return CompWindowTypeMenuMask;
	else if (a == display->winTypeDesktopAtom)
	    return CompWindowTypeDesktopMask;
	else if (a == display->winTypeDockAtom)
	    return CompWindowTypeDockMask;
	else if (a == display->winTypeToolbarAtom)
	    return CompWindowTypeToolbarMask;
	else if (a == display->winTypeUtilAtom)
	    return CompWindowTypeUtilMask;
	else if (a == display->winTypeSplashAtom)
	    return CompWindowTypeSplashMask;
	else if (a == display->winTypeDialogAtom)
	    return CompWindowTypeDialogMask;
	else if (a == display->winTypeDropdownMenuAtom)
	    return CompWindowTypeDropdownMenuMask;
	else if (a == display->winTypePopupMenuAtom)
	    return CompWindowTypePopupMenuMask;
	else if (a == display->winTypeTooltipAtom)
	    return CompWindowTypeTooltipMask;
	else if (a == display->winTypeNotificationAtom)
	    return CompWindowTypeNotificationMask;
	else if (a == display->winTypeComboAtom)
	    return CompWindowTypeComboMask;
	else if (a == display->winTypeDndAtom)
	    return CompWindowTypeDndMask;
    }

    return CompWindowTypeUnknownMask;
}

void
recalcWindowType (CompWindow *w)
{
    unsigned int type;

    type = w->wmType;

    if (!w->attrib.override_redirect && w->wmType == CompWindowTypeUnknownMask)
	type = CompWindowTypeNormalMask;

    if (w->state & CompWindowStateFullscreenMask)
	type = CompWindowTypeFullscreenMask;

    if (type == CompWindowTypeNormalMask)
    {
	if (w->transientFor)
	    type = CompWindowTypeDialogMask;
    }

    if (type == CompWindowTypeDockMask && (w->state & CompWindowStateBelowMask))
	type = CompWindowTypeNormalMask;

    if ((type & (CompWindowTypeNormalMask | CompWindowTypeDialogMask)) &&
	(w->state & CompWindowStateModalMask))
	type = CompWindowTypeModalDialogMask;

    w->type = type;
}

void
getMwmHints (CompDisplay  *display,
	     Window	  id,
	     unsigned int *func,
	     unsigned int *decor)
{
    Atom	  actual;
    int		  result, format;
    unsigned long n, left;
    unsigned char *data;

    *func  = MwmFuncAll;
    *decor = MwmDecorAll;

    result = XGetWindowProperty (display->display, id, display->mwmHintsAtom,
				 0L, 20L, FALSE, display->mwmHintsAtom,
				 &actual, &format, &n, &left, &data);

    if (result == Success && data)
    {
	MwmHints *mwmHints = (MwmHints *) data;

	if (n >= PropMotifWmHintElements)
	{
	    if (mwmHints->flags & MwmHintsDecorations)
		*decor = mwmHints->decorations;

	    if (mwmHints->flags & MwmHintsFunctions)
		*func = mwmHints->functions;
	}

	XFree (data);
    }
}

unsigned int
getProtocols (CompDisplay *display,
	      Window      id)
{
    Atom         *protocol;
    int          count;
    unsigned int protocols = 0;

    if (XGetWMProtocols (display->display, id, &protocol, &count))
    {
	int  i;

	for (i = 0; i < count; i++)
	{
	    if (protocol[i] == display->wmDeleteWindowAtom)
		protocols |= CompWindowProtocolDeleteMask;
	    else if (protocol[i] == display->wmTakeFocusAtom)
		protocols |= CompWindowProtocolTakeFocusMask;
	    else if (protocol[i] == display->wmPingAtom)
		protocols |= CompWindowProtocolPingMask;
	    else if (protocol[i] == display->wmSyncRequestAtom)
		protocols |= CompWindowProtocolSyncRequestMask;
	}

	XFree (protocol);
    }

    return protocols;
}

unsigned int
getWindowProp (CompDisplay  *display,
	       Window	    id,
	       Atom	    property,
	       unsigned int defaultValue)
{
    Atom	  actual;
    int		  result, format;
    unsigned long n, left;
    unsigned char *data;
    unsigned int  retval = defaultValue;

    result = XGetWindowProperty (display->display, id, property,
				 0L, 1L, FALSE, XA_CARDINAL, &actual, &format,
				 &n, &left, &data);

    if (result == Success && data)
    {
	if (n)
	{
	    unsigned long value;

	    memcpy (&value, data, sizeof (unsigned long));
	    retval = (unsigned int) value;
	}

	XFree (data);
    }

    return retval;
}

void
setWindowProp (CompDisplay  *display,
	       Window       id,
	       Atom	    property,
	       unsigned int value)
{
    unsigned long data = value;

    XChangeProperty (display->display, id, property,
		     XA_CARDINAL, 32, PropModeReplace,
		     (unsigned char *) &data, 1);
}

Bool
readWindowProp32 (CompDisplay    *display,
		  Window	 id,
		  Atom		 property,
		  unsigned short *returnValue)
{
    Atom	  actual;
    int		  result, format;
    unsigned long n, left;
    unsigned char *data;
    Bool          retval = FALSE;

    result = XGetWindowProperty (display->display, id, property,
				 0L, 1L, FALSE, XA_CARDINAL, &actual, &format,
				 &n, &left, &data);

    if (result == Success && data)
    {
	if (n)
	{
	    CARD32 value;
	    memcpy (&value, data, sizeof (CARD32));

	    retval = TRUE;
	    *returnValue = value >> 16;
	}

	XFree (data);
    }

    return retval;
}

unsigned short
getWindowProp32 (CompDisplay	*display,
		 Window		id,
		 Atom		property,
		 unsigned short defaultValue)
{
    unsigned short result;

    if (readWindowProp32 (display, id, property, &result))
	return result;

    return defaultValue;
}

void
setWindowProp32 (CompDisplay    *display,
		 Window         id,
		 Atom		property,
		 unsigned short value)
{
    CARD32 value32;

    value32 = value << 16 | value;

    XChangeProperty (display->display, id, property,
		     XA_CARDINAL, 32, PropModeReplace,
		     (unsigned char *) &value32, 1);
}

static void
updateFrameWindow (CompWindow *w)
{
    CompDisplay *d = w->screen->display;

    if (w->input.left || w->input.right || w->input.top || w->input.bottom)
    {
	XRectangle rects[4];
	int	   x, y, width, height;
	int	   i = 0;
	int	   bw = w->serverBorderWidth * 2;

	x      = w->serverX - w->input.left;
	y      = w->serverY - w->input.top;
	width  = w->serverWidth  + w->input.left + w->input.right + bw;
	height = w->serverHeight + w->input.top  + w->input.bottom + bw;

	if (w->shaded)
	    height = w->input.top + w->input.bottom;

	if (!w->frame)
	{
	    XSetWindowAttributes attr;
	    XWindowChanges	 xwc;

	    attr.event_mask	   = 0;
	    attr.override_redirect = TRUE;

	    w->frame = XCreateWindow (d->display, w->screen->root,
				      x, y, width, height, 0,
				      CopyFromParent,
				      InputOnly,
				      CopyFromParent,
				      CWOverrideRedirect | CWEventMask, &attr);

	    XGrabButton (d->display, AnyButton, AnyModifier, w->frame, TRUE,
			 ButtonPressMask | ButtonReleaseMask | ButtonMotionMask,
			 GrabModeSync, GrabModeSync, None, None);

	    xwc.stack_mode = Below;
	    xwc.sibling    = w->id;

	    XConfigureWindow (d->display, w->frame,
			      CWSibling | CWStackMode, &xwc);

	    if (w->mapNum || w->shaded)
		XMapWindow (d->display, w->frame);

	    XChangeProperty (d->display, w->id, d->frameWindowAtom,
			     XA_WINDOW, 32, PropModeReplace,
			     (unsigned char *) &w->frame, 1);
	}

	XMoveResizeWindow (d->display, w->frame, x, y, width, height);

	rects[i].x	= 0;
	rects[i].y	= 0;
	rects[i].width  = width;
	rects[i].height = w->input.top;

	if (rects[i].width && rects[i].height)
	    i++;

	rects[i].x	= 0;
	rects[i].y	= w->input.top;
	rects[i].width  = w->input.left;
	rects[i].height = height - w->input.top - w->input.bottom;

	if (rects[i].width && rects[i].height)
	    i++;

	rects[i].x	= width - w->input.right;
	rects[i].y	= w->input.top;
	rects[i].width  = w->input.right;
	rects[i].height = height - w->input.top - w->input.bottom;

	if (rects[i].width && rects[i].height)
	    i++;

	rects[i].x	= 0;
	rects[i].y	= height - w->input.bottom;
	rects[i].width  = width;
	rects[i].height = w->input.bottom;

	if (rects[i].width && rects[i].height)
	    i++;

	XShapeCombineRectangles (d->display,
				 w->frame,
				 ShapeInput,
				 0,
				 0,
				 rects,
				 i,
				 ShapeSet,
				 YXBanded);
    }
    else
    {
	if (w->frame)
	{
	    XDeleteProperty (d->display, w->id, d->frameWindowAtom);
	    XDestroyWindow (d->display, w->frame);
	    w->frame = None;
	}
    }

    recalcWindowActions (w);
}

void
setWindowFrameExtents (CompWindow	 *w,
		       CompWindowExtents *input)
{
    if (input->left   != w->input.left  ||
	input->right  != w->input.right ||
	input->top    != w->input.top   ||
	input->bottom != w->input.bottom)
    {
	unsigned long data[4];

	w->input = *input;

	data[0] = input->left;
	data[1] = input->right;
	data[2] = input->top;
	data[3] = input->bottom;

	updateWindowSize (w);
	updateFrameWindow (w);
	recalcWindowActions (w);

	XChangeProperty (w->screen->display->display, w->id,
			 w->screen->display->frameExtentsAtom,
			 XA_CARDINAL, 32, PropModeReplace,
			 (unsigned char *) data, 4);
    }
}

void
updateWindowOutputExtents (CompWindow *w)
{
    CompWindowExtents output;

    (*w->screen->getOutputExtentsForWindow) (w, &output);

    if (output.left   != w->output.left  ||
	output.right  != w->output.right ||
	output.top    != w->output.top   ||
	output.bottom != w->output.bottom)
    {
	w->output = output;

	(*w->screen->windowResizeNotify) (w, 0, 0, 0, 0);
    }
}

void
setWindowFullscreenMonitors (CompWindow               *w,
			     CompFullscreenMonitorSet *monitors)
{
    CompScreen  *s = w->screen;
    CompDisplay *d = s->display;
    Bool        hadFsMonitors = w->fullscreenMonitorsSet;

    w->fullscreenMonitorsSet = FALSE;

    if (monitors                         &&
	monitors->left   < s->nOutputDev &&
	monitors->right  < s->nOutputDev &&
	monitors->top    < s->nOutputDev &&
	monitors->bottom < s->nOutputDev)
    {
	BOX fsBox;

	fsBox.x1 = s->outputDev[monitors->left].region.extents.x1;
	fsBox.y1 = s->outputDev[monitors->top].region.extents.y1;
	fsBox.x2 = s->outputDev[monitors->right].region.extents.x2;
	fsBox.y2 = s->outputDev[monitors->bottom].region.extents.y2;

	if (fsBox.x1 < fsBox.x2 && fsBox.y1 < fsBox.y2)
	{
	    w->fullscreenMonitorsSet = TRUE;

	    w->fullscreenMonitorRect.x      = fsBox.x1;
	    w->fullscreenMonitorRect.y      = fsBox.y1;
	    w->fullscreenMonitorRect.width  = fsBox.x2 - fsBox.x1;
	    w->fullscreenMonitorRect.height = fsBox.y2 - fsBox.y1;
	}
    }

    if (w->fullscreenMonitorsSet)
    {
	long data[4];

	data[0] = monitors->top;
	data[1] = monitors->bottom;
	data[2] = monitors->left;
	data[3] = monitors->right;

	XChangeProperty (d->display, w->id, d->wmFullscreenMonitorsAtom,
			 XA_CARDINAL, 32, PropModeReplace,
			 (unsigned char *) data, 4);
    }
    else if (hadFsMonitors)
    {
	XDeleteProperty (d->display, w->id, d->wmFullscreenMonitorsAtom);
    }

    if (w->state & CompWindowStateFullscreenMask)
	if (w->fullscreenMonitorsSet || hadFsMonitors)
	    updateWindowAttributes (w, CompStackingUpdateModeNone);
}

static void
setWindowMatrix (CompWindow *w)
{
    w->matrix = w->texture->matrix;
    w->matrix.x0 -= (w->attrib.x * w->matrix.xx);
    w->matrix.y0 -= (w->attrib.y * w->matrix.yy);
}

Bool
bindWindow (CompWindow *w)
{
    redirectWindow (w);

    if (!w->pixmap)
    {
	XWindowAttributes attr;
	Display           *dpy = w->screen->display->display;

	/* don't try to bind window again if it failed previously */
	if (w->bindFailed)
	    return FALSE;

	/* We have to grab the server here to make sure that window
	   is mapped when getting the window pixmap */
	XGrabServer (dpy);

	if (!XGetWindowAttributes (dpy, w->id, &attr) ||
	    attr.map_state != IsViewable)
	{
	    XUngrabServer (dpy);
	    finiTexture (w->screen, w->texture);
	    w->bindFailed = TRUE;
	    return FALSE;
	}

	w->pixmap = XCompositeNameWindowPixmap (dpy, w->id);
	w->width  = attr.width + attr.border_width * 2;
	w->height = attr.height + attr.border_width * 2;

	XUngrabServer (dpy);
    }

    if (!bindPixmapToTexture (w->screen, w->texture, w->pixmap,
			      w->width, w->height,
			      w->attrib.depth))
    {
	compLogMessage ("core", CompLogLevelInfo,
			"Couldn't bind redirected window 0x%x to "
			"texture\n", (int) w->id);
    }

    setWindowMatrix (w);

    return TRUE;
}

void
releaseWindow (CompWindow *w)
{
    if (w->pixmap)
    {
	CompTexture *texture;

	texture = createTexture (w->screen);
	if (texture)
	{
	    destroyTexture (w->screen, w->texture);

	    w->texture = texture;
	}

	XFreePixmap (w->screen->display->display, w->pixmap);

	w->pixmap = None;
    }
}

static void
freeWindow (CompWindow *w)
{
    releaseWindow (w);

    if (w->syncAlarm)
	XSyncDestroyAlarm (w->screen->display->display, w->syncAlarm);

    if (w->syncWaitHandle)
	compRemoveTimeout (w->syncWaitHandle);

    destroyTexture (w->screen, w->texture);

    if (w->frame)
	XDestroyWindow (w->screen->display->display, w->frame);

    if (w->clip)
	XDestroyRegion (w->clip);

    if (w->region)
	XDestroyRegion (w->region);

    if (w->hints)
	XFree (w->hints);

    if (w->base.privates)
	free (w->base.privates);

    if (w->sizeDamage)
	free (w->damageRects);

    if (w->vertices)
	free (w->vertices);

    if (w->indices)
	free (w->indices);

    if (w->struts)
	free (w->struts);

    if (w->icon)
	freeWindowIcons (w);

    if (w->startupId)
	free (w->startupId);

    if (w->resName)
	free (w->resName);

    if (w->resClass)
	free (w->resClass);

    free (w);
}

void
damageTransformedWindowRect (CompWindow *w,
			     float	xScale,
			     float	yScale,
			     float	xTranslate,
			     float	yTranslate,
			     BoxPtr     rect)
{
    REGION reg;

    reg.rects    = &reg.extents;
    reg.numRects = 1;

    reg.extents.x1 = (rect->x1 * xScale) - 1;
    reg.extents.y1 = (rect->y1 * yScale) - 1;
    reg.extents.x2 = (rect->x2 * xScale + 0.5f) + 1;
    reg.extents.y2 = (rect->y2 * yScale + 0.5f) + 1;

    reg.extents.x1 += xTranslate;
    reg.extents.y1 += yTranslate;
    reg.extents.x2 += (xTranslate + 0.5f);
    reg.extents.y2 += (yTranslate + 0.5f);

    if (reg.extents.x2 > reg.extents.x1 && reg.extents.y2 > reg.extents.y1)
    {
	reg.extents.x1 += w->attrib.x + w->attrib.border_width;
	reg.extents.y1 += w->attrib.y + w->attrib.border_width;
	reg.extents.x2 += w->attrib.x + w->attrib.border_width;
	reg.extents.y2 += w->attrib.y + w->attrib.border_width;

	damageScreenRegion (w->screen, &reg);
    }
}

void
damageWindowOutputExtents (CompWindow *w)
{
    if (w->screen->damageMask & COMP_SCREEN_DAMAGE_ALL_MASK)
	return;

    if (w->shaded || (w->attrib.map_state == IsViewable && w->damaged))
    {
	BoxRec box;

	/* top */
	box.x1 = -w->output.left - w->attrib.border_width;
	box.y1 = -w->output.top - w->attrib.border_width;
	box.x2 = w->width + w->output.right - w->attrib.border_width;
	box.y2 = -w->attrib.border_width;

	if (box.x1 < box.x2 && box.y1 < box.y2)
	    addWindowDamageRect (w, &box);

	/* bottom */
	box.y1 = w->height - w->attrib.border_width;
	box.y2 = box.y1 + w->output.bottom - w->attrib.border_width;

	if (box.x1 < box.x2 && box.y1 < box.y2)
	    addWindowDamageRect (w, &box);

	/* left */
	box.x1 = -w->output.left - w->attrib.border_width;
	box.y1 = -w->attrib.border_width;
	box.x2 = -w->attrib.border_width;
	box.y2 = w->height - w->attrib.border_width;

	if (box.x1 < box.x2 && box.y1 < box.y2)
	    addWindowDamageRect (w, &box);

	/* right */
	box.x1 = w->width - w->attrib.border_width;
	box.x2 = box.x1 + w->output.right - w->attrib.border_width;

	if (box.x1 < box.x2 && box.y1 < box.y2)
	    addWindowDamageRect (w, &box);
    }
}

Bool
damageWindowRect (CompWindow *w,
		  Bool       initial,
		  BoxPtr     rect)
{
    return FALSE;
}

void
addWindowDamageRect (CompWindow *w,
		     BoxPtr     rect)
{
    REGION region;

    if (w->screen->damageMask & COMP_SCREEN_DAMAGE_ALL_MASK)
	return;

    region.extents = *rect;

    if (!(*w->screen->damageWindowRect) (w, FALSE, &region.extents))
    {
	region.extents.x1 += w->attrib.x + w->attrib.border_width;
	region.extents.y1 += w->attrib.y + w->attrib.border_width;
	region.extents.x2 += w->attrib.x + w->attrib.border_width;
	region.extents.y2 += w->attrib.y + w->attrib.border_width;

	region.rects = &region.extents;
	region.numRects = region.size = 1;

	damageScreenRegion (w->screen, &region);
    }
}

void
getOutputExtentsForWindow (CompWindow	     *w,
			   CompWindowExtents *output)
{
    output->left   = 0;
    output->right  = 0;
    output->top    = 0;
    output->bottom = 0;
}

void
addWindowDamage (CompWindow *w)
{
    if (w->screen->damageMask & COMP_SCREEN_DAMAGE_ALL_MASK)
	return;

    if (w->shaded || (w->attrib.map_state == IsViewable && w->damaged))
    {
	BoxRec box;

	box.x1 = -w->output.left - w->attrib.border_width;
	box.y1 = -w->output.top - w->attrib.border_width;
	box.x2 = w->width + w->output.right;
	box.y2 = w->height + w->output.bottom;

	addWindowDamageRect (w, &box);
    }
}

void
updateWindowRegion (CompWindow *w)
{
    REGION     rect;
    XRectangle r, *rects, *shapeRects = 0;
    int	       i, n = 0;

    EMPTY_REGION (w->region);

    if (w->screen->display->shapeExtension)
    {
	int order;

	shapeRects = XShapeGetRectangles (w->screen->display->display, w->id,
					  ShapeBounding, &n, &order);
    }

    if (n < 1)
    {
	r.x      = -w->attrib.border_width;
	r.y      = -w->attrib.border_width;
	r.width  = w->attrib.width + w->attrib.border_width;
	r.height = w->attrib.height + w->attrib.border_width;

	rects = &r;
	n = 1;
    }
    else
    {
	rects = shapeRects;
    }

    rect.rects = &rect.extents;
    rect.numRects = rect.size = 1;

    for (i = 0; i < n; i++)
    {
	rect.extents.x1 = rects[i].x + w->attrib.border_width;
	rect.extents.y1 = rects[i].y + w->attrib.border_width;
	rect.extents.x2 = rect.extents.x1 + rects[i].width +
			  w->attrib.border_width;
	rect.extents.y2 = rect.extents.y1 + rects[i].height +
			  w->attrib.border_width;

	if (rect.extents.x1 < 0)
	    rect.extents.x1 = 0;
	if (rect.extents.y1 < 0)
	    rect.extents.y1 = 0;
	if (rect.extents.x2 > w->width)
	    rect.extents.x2 = w->width;
	if (rect.extents.y2 > w->height)
	    rect.extents.y2 = w->height;

	if (rect.extents.y1 < rect.extents.y2 &&
	    rect.extents.x1 < rect.extents.x2)
	{
	    rect.extents.x1 += w->attrib.x;
	    rect.extents.y1 += w->attrib.y;
	    rect.extents.x2 += w->attrib.x;
	    rect.extents.y2 += w->attrib.y;

	    XUnionRegion (&rect, w->region, w->region);
	}
    }

    if (shapeRects)
	XFree (shapeRects);
}

Bool
updateWindowStruts (CompWindow *w)
{
    Atom	  actual;
    int		  result, format;
    unsigned long n, left;
    unsigned char *data;
    Bool	  hasOld, hasNew;
    CompStruts    old, new;

    if (w->struts)
    {
	hasOld = TRUE;

	old.left   = w->struts->left;
	old.right  = w->struts->right;
	old.top    = w->struts->top;
	old.bottom = w->struts->bottom;
    }
    else
    {
	hasOld = FALSE;
    }

    hasNew = FALSE;

    new.left.x	    = 0;
    new.left.y	    = 0;
    new.left.width  = 0;
    new.left.height = w->screen->height;

    new.right.x      = w->screen->width;
    new.right.y      = 0;
    new.right.width  = 0;
    new.right.height = w->screen->height;

    new.top.x	   = 0;
    new.top.y	   = 0;
    new.top.width  = w->screen->width;
    new.top.height = 0;

    new.bottom.x      = 0;
    new.bottom.y      = w->screen->height;
    new.bottom.width  = w->screen->width;
    new.bottom.height = 0;

    result = XGetWindowProperty (w->screen->display->display, w->id,
				 w->screen->display->wmStrutPartialAtom,
				 0L, 12L, FALSE, XA_CARDINAL, &actual, &format,
				 &n, &left, &data);

    if (result == Success && data)
    {
	unsigned long *struts = (unsigned long *) data;

	if (n == 12)
	{
	    hasNew = TRUE;

	    new.left.y       = struts[4];
	    new.left.width   = struts[0];
	    new.left.height  = struts[5] - new.left.y + 1;

	    new.right.width  = struts[1];
	    new.right.x      = w->screen->width - new.right.width;
	    new.right.y      = struts[6];
	    new.right.height = struts[7] - new.right.y + 1;

	    new.top.x        = struts[8];
	    new.top.width    = struts[9] - new.top.x + 1;
	    new.top.height   = struts[2];

	    new.bottom.x      = struts[10];
	    new.bottom.width  = struts[11] - new.bottom.x + 1;
	    new.bottom.height = struts[3];
	    new.bottom.y      = w->screen->height - new.bottom.height;
	}

	XFree (data);
    }

    if (!hasNew)
    {
	result = XGetWindowProperty (w->screen->display->display, w->id,
				     w->screen->display->wmStrutAtom,
				     0L, 4L, FALSE, XA_CARDINAL,
				     &actual, &format, &n, &left, &data);

	if (result == Success && data)
	{
	    unsigned long *struts = (unsigned long *) data;

	    if (n == 4)
	    {
		hasNew = TRUE;

		new.left.x     = 0;
		new.left.width = struts[0];

		new.right.width = struts[1];
		new.right.x     = w->screen->width - new.right.width;

		new.top.y      = 0;
		new.top.height = struts[2];

		new.bottom.height = struts[3];
		new.bottom.y      = w->screen->height - new.bottom.height;
	    }

	    XFree (data);
	}
    }

    if (hasNew)
    {
	int strutX1, strutY1, strutX2, strutY2;
	int x1, y1, x2, y2;
	int i;

	/* applications expect us to clip struts to xinerama edges */
	for (i = 0; i < w->screen->display->nScreenInfo; i++)
	{
	    x1 = w->screen->display->screenInfo[i].x_org;
	    y1 = w->screen->display->screenInfo[i].y_org;
	    x2 = x1 + w->screen->display->screenInfo[i].width;
	    y2 = y1 + w->screen->display->screenInfo[i].height;

	    strutX1 = new.left.x;
	    strutX2 = strutX1 + new.left.width;
	    strutY1 = new.left.y;
	    strutY2 = strutY1 + new.left.height;

	    if (strutX2 > x1 && strutX2 <= x2 &&
		strutY1 < y2 && strutY2 > y1)
	    {
		new.left.x     = x1;
		new.left.width = strutX2 - x1;
	    }

	    strutX1 = new.right.x;
	    strutX2 = strutX1 + new.right.width;
	    strutY1 = new.right.y;
	    strutY2 = strutY1 + new.right.height;

	    if (strutX1 > x1 && strutX1 <= x2 &&
		strutY1 < y2 && strutY2 > y1)
	    {
		new.right.x     = strutX1;
		new.right.width = x2 - strutX1;
	    }

	    strutX1 = new.top.x;
	    strutX2 = strutX1 + new.top.width;
	    strutY1 = new.top.y;
	    strutY2 = strutY1 + new.top.height;

	    if (strutX1 < x2 && strutX2 > x1 &&
		strutY2 > y1 && strutY2 <= y2)
	    {
		new.top.y      = y1;
		new.top.height = strutY2 - y1;
	    }

	    strutX1 = new.bottom.x;
	    strutX2 = strutX1 + new.bottom.width;
	    strutY1 = new.bottom.y;
	    strutY2 = strutY1 + new.bottom.height;

	    if (strutX1 < x2 && strutX2 > x1 &&
		strutY1 > y1 && strutY1 <= y2)
	    {
		new.bottom.y      = strutY1;
		new.bottom.height = y2 - strutY1;
	    }
	}
    }

    if (hasOld != hasNew || (hasNew && hasOld &&
			     memcmp (&new, &old, sizeof (CompStruts))))
    {
	if (hasNew)
	{
	    if (!w->struts)
	    {
		w->struts = malloc (sizeof (CompStruts));
		if (!w->struts)
		    return FALSE;
	    }

	    *w->struts = new;
	}
	else
	{
	    free (w->struts);
	    w->struts = NULL;
	}

	return TRUE;
    }

    return FALSE;
}

static void
setDefaultWindowAttributes (XWindowAttributes *wa)
{
    wa->x		      = 0;
    wa->y		      = 0;
    wa->width		      = 1;
    wa->height		      = 1;
    wa->border_width	      = 0;
    wa->depth		      = 0;
    wa->visual		      = NULL;
    wa->root		      = None;
    wa->class		      = InputOnly;
    wa->bit_gravity	      = NorthWestGravity;
    wa->win_gravity	      = NorthWestGravity;
    wa->backing_store	      = NotUseful;
    wa->backing_planes	      = 0;
    wa->backing_pixel	      = 0;
    wa->save_under	      = FALSE;
    wa->colormap	      = None;
    wa->map_installed	      = FALSE;
    wa->map_state	      = IsUnviewable;
    wa->all_event_masks	      = 0;
    wa->your_event_mask	      = 0;
    wa->do_not_propagate_mask = 0;
    wa->override_redirect     = TRUE;
    wa->screen		      = NULL;
}

void
addWindow (CompScreen *screen,
	   Window     id,
	   Window     aboveId)
{
    CompWindow  *w;
    CompPrivate	*privates;
    CompDisplay *d = screen->display;

    w = (CompWindow *) malloc (sizeof (CompWindow));
    if (!w)
	return;

    w->next = NULL;
    w->prev = NULL;

    w->mapNum	 = 0;
    w->activeNum = 0;

    w->frame = None;

    w->placed		 = FALSE;
    w->minimized	 = FALSE;
    w->inShowDesktopMode = FALSE;
    w->shaded		 = FALSE;
    w->hidden		 = FALSE;
    w->grabbed		 = FALSE;

    w->desktop = screen->currentDesktop;

    w->initialViewportX = screen->x;
    w->initialViewportY = screen->y;

    w->initialTimestamp	   = 0;
    w->initialTimestampSet = FALSE;

    w->pendingUnmaps = 0;
    w->pendingMaps   = 0;

    w->startupId = NULL;
    w->resName   = NULL;
    w->resClass  = NULL;

    w->texture = createTexture (screen);
    if (!w->texture)
    {
	free (w);
	return;
    }

    w->screen     = screen;
    w->pixmap     = None;
    w->destroyed  = FALSE;
    w->damaged    = FALSE;
    w->redirected = TRUE;
    w->managed    = FALSE;
    w->unmanaging = FALSE;
    w->bindFailed = FALSE;

    w->destroyRefCnt = 1;
    w->unmapRefCnt   = 1;

    w->group = NULL;
    w->hints = NULL;

    w->damageRects = 0;
    w->sizeDamage  = 0;
    w->nDamage	   = 0;

    w->vertices     = 0;
    w->vertexSize   = 0;
    w->vertexStride = 0;
    w->indices      = 0;
    w->indexSize    = 0;
    w->vCount	    = 0;
    w->indexCount   = 0;
    w->texCoordSize = 2;

    w->drawWindowGeometry = NULL;

    w->struts = 0;

    w->icon  = 0;
    w->nIcon = 0;

    w->iconGeometry.x      = 0;
    w->iconGeometry.y      = 0;
    w->iconGeometry.width  = 0;
    w->iconGeometry.height = 0;
    w->iconGeometrySet     = FALSE;

    w->input.left   = 0;
    w->input.right  = 0;
    w->input.top    = 0;
    w->input.bottom = 0;

    w->output.left   = 0;
    w->output.right  = 0;
    w->output.top    = 0;
    w->output.bottom = 0;

    w->paint.xScale	= 1.0f;
    w->paint.yScale	= 1.0f;
    w->paint.xTranslate	= 0.0f;
    w->paint.yTranslate	= 0.0f;

    w->alive = TRUE;

    w->mwmDecor = MwmDecorAll;
    w->mwmFunc  = MwmFuncAll;

    w->syncAlarm      = None;
    w->syncCounter    = 0;
    w->syncWaitHandle = 0;

    w->closeRequests	    = 0;
    w->lastCloseRequestTime = 0;

    w->fullscreenMonitorsSet = FALSE;
    w->overlayWindow         = FALSE;

    if (screen->windowPrivateLen)
    {
	privates = malloc (screen->windowPrivateLen * sizeof (CompPrivate));
	if (!privates)
	{
	    destroyTexture (screen, w->texture);
	    free (w);
	    return;
	}
    }
    else
	privates = 0;

    compObjectInit (&w->base, privates, COMP_OBJECT_TYPE_WINDOW);

    w->region = XCreateRegion ();
    if (!w->region)
    {
	freeWindow (w);
	return;
    }

    w->clip = XCreateRegion ();
    if (!w->clip)
    {
	freeWindow (w);
	return;
    }

    /* Failure means that window has been destroyed. We still have to add the
       window to the window list as we might get configure requests which
       require us to stack other windows relative to it. Setting some default
       values if this is the case. */
    if (!XGetWindowAttributes (d->display, id, &w->attrib))
	setDefaultWindowAttributes (&w->attrib);

    w->serverWidth	 = w->attrib.width;
    w->serverHeight	 = w->attrib.height;
    w->serverBorderWidth = w->attrib.border_width;

    w->width  = w->attrib.width  + w->attrib.border_width * 2;
    w->height = w->attrib.height + w->attrib.border_width * 2;

    w->sizeHints.flags = 0;

    recalcNormalHints (w);

    w->transientFor = None;
    w->clientLeader = None;

    w->serverX = w->attrib.x;
    w->serverY = w->attrib.y;

    w->syncWait	       = FALSE;
    w->syncX	       = w->attrib.x;
    w->syncY	       = w->attrib.y;
    w->syncWidth       = w->attrib.width;
    w->syncHeight      = w->attrib.height;
    w->syncBorderWidth = w->attrib.border_width;

    w->saveMask = 0;

    XSelectInput (d->display, id,
		  PropertyChangeMask |
		  EnterWindowMask    |
		  FocusChangeMask);

    w->id = id;

    XGrabButton (d->display, AnyButton, AnyModifier, w->id, TRUE,
		 ButtonPressMask | ButtonReleaseMask | ButtonMotionMask,
		 GrabModeSync, GrabModeSync, None, None);

    w->inputHint = TRUE;
    w->alpha     = (w->attrib.depth == 32);
    w->wmType    = 0;
    w->state     = 0;
    w->actions   = 0;
    w->protocols = 0;
    w->type      = CompWindowTypeUnknownMask;
    w->lastPong  = d->lastPing;

    if (d->shapeExtension)
	XShapeSelectInput (d->display, id, ShapeNotifyMask);

    insertWindowIntoScreen (screen, w, aboveId);

    EMPTY_REGION (w->region);

    if (w->attrib.class != InputOnly)
    {
	REGION rect;

	rect.rects = &rect.extents;
	rect.numRects = rect.size = 1;

	rect.extents.x1 = w->attrib.x;
	rect.extents.y1 = w->attrib.y;
	rect.extents.x2 = w->attrib.x + w->width;
	rect.extents.y2 = w->attrib.y + w->height;

	XUnionRegion (&rect, w->region, w->region);

	w->damage = XDamageCreate (d->display, id,
				   XDamageReportRawRectangles);

	/* need to check for DisplayModal state on all windows */
	w->state = getWindowState (d, w->id);

	updateWindowClassHints (w);
    }
    else
    {
	w->damage = None;
	w->attrib.map_state = IsUnmapped;
    }

    w->invisible = TRUE;

    w->wmType    = getWindowType (d, w->id);
    w->protocols = getProtocols (d, w->id);

    if (!w->attrib.override_redirect)
    {
	updateNormalHints (w);
	updateWindowStruts (w);
	updateWmHints (w);
	updateTransientHint (w);

	w->clientLeader = getClientLeader (w);
	if (!w->clientLeader)
	    w->startupId = getStartupId (w);

	recalcWindowType (w);

	getMwmHints (d, w->id, &w->mwmFunc, &w->mwmDecor);

	if (!(w->type & (CompWindowTypeDesktopMask | CompWindowTypeDockMask)))
	{
	    w->desktop = getWindowProp (d, w->id, d->winDesktopAtom,
					w->desktop);
	    if (w->desktop != 0xffffffff)
	    {
		if (w->desktop >= screen->nDesktop)
		    w->desktop = screen->currentDesktop;
	    }
	}
    }
    else
    {
	recalcWindowType (w);
    }

    if (w->type & CompWindowTypeDesktopMask)
	w->paint.opacity = OPAQUE;
    else
	w->paint.opacity = getWindowProp32 (d, w->id,
					    d->winOpacityAtom, OPAQUE);

    w->paint.brightness = getWindowProp32 (d, w->id,
					   d->winBrightnessAtom, BRIGHT);

    if (!screen->canDoSaturated)
	w->paint.saturation = COLOR;
    else
	w->paint.saturation = getWindowProp32 (d, w->id,
					       d->winSaturationAtom, COLOR);

    w->lastPaint = w->paint;

    if (w->attrib.map_state == IsViewable)
    {
	w->placed = TRUE;

	if (!w->attrib.override_redirect)
	{
	    w->managed = TRUE;

	    if (getWmState (d, w->id) == IconicState)
	    {
		if (w->state & CompWindowStateShadedMask)
		    w->shaded = TRUE;
		else
		    w->minimized = TRUE;
	    }
	    else
	    {
		if (w->wmType & (CompWindowTypeDockMask |
				 CompWindowTypeDesktopMask))
		{
		    setDesktopForWindow (w, 0xffffffff);
		}
		else
		{
		    if (w->desktop != 0xffffffff)
			w->desktop = screen->currentDesktop;

		    setWindowProp (d, w->id, d->winDesktopAtom, w->desktop);
		}
	    }
	}

	w->attrib.map_state = IsUnmapped;
	w->pendingMaps++;

	mapWindow (w);

	updateWindowAttributes (w, CompStackingUpdateModeInitialMap);

	if (w->minimized || w->inShowDesktopMode || w->hidden || w->shaded)
	{
	    w->state |= CompWindowStateHiddenMask;

	    w->pendingUnmaps++;

	    XUnmapWindow (d->display, w->id);

	    setWindowState (d, w->state, w->id);
	}
    }
    else if (!w->attrib.override_redirect)
    {
	if (getWmState (d, w->id) == IconicState)
	{
	    w->managed = TRUE;
	    w->placed  = TRUE;

	    if (w->state & CompWindowStateHiddenMask)
	    {
		if (w->state & CompWindowStateShadedMask)
		    w->shaded = TRUE;
		else
		    w->minimized = TRUE;
	    }
	}
    }

    /* TODO: bailout properly when objectInitPlugins fails */
    assert (objectInitPlugins (&w->base));

    (*core.objectAdd) (&screen->base, &w->base);

    recalcWindowActions (w);
    updateIconGeometry (w);

    if (w->shaded)
	resizeWindow (w,
		      w->attrib.x, w->attrib.y,
		      w->attrib.width, ++w->attrib.height - 1,
		      w->attrib.border_width);
}

void
removeWindow (CompWindow *w)
{
    unhookWindowFromScreen (w->screen, w);

    if (!w->destroyed)
    {
	CompDisplay *d = w->screen->display;

	/* restore saved geometry and map if hidden */
	if (!w->attrib.override_redirect)
	{
	    if (w->saveMask)
		XConfigureWindow (d->display, w->id, w->saveMask, &w->saveWc);

	    if (!w->hidden)
	    {
		if (w->state & CompWindowStateHiddenMask)
		    XMapWindow (d->display, w->id);
	    }
	}

	if (w->damage)
	    XDamageDestroy (d->display, w->damage);

	if (d->shapeExtension)
	    XShapeSelectInput (d->display, w->id, NoEventMask);

	XSelectInput (d->display, w->id, NoEventMask);

	XUngrabButton (d->display, AnyButton, AnyModifier, w->id);
    }

    if (w->attrib.map_state == IsViewable && w->damaged)
    {
	if (w->type == CompWindowTypeDesktopMask)
	    w->screen->desktopWindowCount--;

	if (w->destroyed && w->struts)
	    updateWorkareaForScreen (w->screen);
    }

    if (w->destroyed)
	updateClientListForScreen (w->screen);

    if (!w->redirected)
    {
	w->screen->overlayWindowCount--;

	if (w->screen->overlayWindowCount < 1)
	    showOutputWindow (w->screen);
    }

    (*core.objectRemove) (&w->screen->base, &w->base);

    objectFiniPlugins (&w->base);

    freeWindow (w);
}

void
destroyWindow (CompWindow *w)
{
    w->id = 1;
    w->mapNum = 0;

    w->destroyRefCnt--;
    if (w->destroyRefCnt)
	return;

    if (!w->destroyed)
    {
	w->destroyed = TRUE;
	w->screen->pendingDestroys++;
    }
}

void
sendConfigureNotify (CompWindow *w)
{
    XConfigureEvent xev;

    xev.type   = ConfigureNotify;
    xev.event  = w->id;
    xev.window = w->id;

    /* normally we should never send configure notify events to override
       redirect windows but if they support the _NET_WM_SYNC_REQUEST
       protocol we need to do this when the window is mapped. however the
       only way we can make sure that the attributes we send are correct
       and is to grab the server. */
    if (w->attrib.override_redirect)
    {
	XWindowAttributes attrib;

	XGrabServer (w->screen->display->display);

	if (XGetWindowAttributes (w->screen->display->display, w->id, &attrib))
	{
	    xev.x	     = attrib.x;
	    xev.y	     = attrib.y;
	    xev.width	     = attrib.width;
	    xev.height	     = attrib.height;
	    xev.border_width = attrib.border_width;

	    xev.above		  = (w->prev) ? w->prev->id : None;
	    xev.override_redirect = TRUE;

	    XSendEvent (w->screen->display->display, w->id, FALSE,
			StructureNotifyMask, (XEvent *) &xev);
	}

	XUngrabServer (w->screen->display->display);
    }
    else
    {
	xev.x		 = w->serverX;
	xev.y		 = w->serverY;
	xev.width	 = w->serverWidth;
	xev.height	 = w->serverHeight;
	xev.border_width = w->serverBorderWidth;

	xev.above	      = (w->prev) ? w->prev->id : None;
	xev.override_redirect = w->attrib.override_redirect;

	XSendEvent (w->screen->display->display, w->id, FALSE,
		    StructureNotifyMask, (XEvent *) &xev);
    }
}

void
mapWindow (CompWindow *w)
{
    if (w->attrib.map_state == IsViewable)
	return;

    if (w->pendingMaps > 0)
	w->pendingMaps--;

    w->mapNum = w->screen->mapNum++;

    if (w->struts)
	updateWorkareaForScreen (w->screen);

    if (w->attrib.class == InputOnly)
	return;

    w->unmapRefCnt = 1;

    w->attrib.map_state = IsViewable;

    if (!w->attrib.override_redirect)
	setWmState (w->screen->display, NormalState, w->id);

    w->invisible  = TRUE;
    w->damaged    = FALSE;
    w->alive      = TRUE;
    w->bindFailed = FALSE;

    w->lastPong = w->screen->display->lastPing;

    updateWindowRegion (w);
    updateWindowSize (w);

    if (w->frame)
	XMapWindow (w->screen->display->display, w->frame);

    updateClientListForScreen (w->screen);

    if (w->type & CompWindowTypeDesktopMask)
	w->screen->desktopWindowCount++;

    if (w->protocols & CompWindowProtocolSyncRequestMask)
    {
	sendSyncRequest (w);
	sendConfigureNotify (w);
    }

    if (!w->attrib.override_redirect)
    {
	/* been shaded */
	if (!w->height)
	    resizeWindow (w,
			  w->attrib.x, w->attrib.y,
			  w->attrib.width, ++w->attrib.height - 1,
			  w->attrib.border_width);
    }
}

void
unmapWindow (CompWindow *w)
{
    if (w->mapNum)
    {
	if (w->frame && !w->shaded)
	    XUnmapWindow (w->screen->display->display, w->frame);

	w->mapNum = 0;
    }

    w->unmapRefCnt--;
    if (w->unmapRefCnt > 0)
	return;

    if (w->unmanaging)
    {
	XWindowChanges xwc;
	unsigned int   xwcm;
	int            gravity = w->sizeHints.win_gravity;

	/* revert gravity adjustment made at MapRequest time */
	xwc.x      = w->serverX;
	xwc.y      = w->serverY;
	xwc.width  = 0;
	xwc.height = 0;

	xwcm = adjustConfigureRequestForGravity (w, &xwc,
						 CWX | CWY,
						 gravity, -1);

	if (xwcm)
	    configureXWindow (w, xwcm, &xwc);

	w->unmanaging = FALSE;
    }

    if (w->struts)
	updateWorkareaForScreen (w->screen);

    if (w->attrib.map_state != IsViewable)
	return;

    if (w->type == CompWindowTypeDesktopMask)
	w->screen->desktopWindowCount--;

    addWindowDamage (w);

    w->attrib.map_state = IsUnmapped;

    w->invisible = TRUE;

    releaseWindow (w);

    if (w->shaded && w->height)
	resizeWindow (w,
		      w->attrib.x, w->attrib.y,
		      w->attrib.width, ++w->attrib.height - 1,
		      w->attrib.border_width);

    updateClientListForScreen (w->screen);

    if (!w->redirected)
	redirectWindow (w);
}

static int
restackWindow (CompWindow *w,
	       Window     aboveId)
{
    if (w->prev)
    {
	if (aboveId && aboveId == w->prev->id)
	    return 0;
    }
    else if (aboveId == None && !w->next)
	return 0;

    unhookWindowFromScreen (w->screen, w);
    insertWindowIntoScreen (w->screen, w, aboveId);

    updateClientListForScreen (w->screen);

    return 1;
}

Bool
resizeWindow (CompWindow *w,
	      int	 x,
	      int	 y,
	      int	 width,
	      int	 height,
	      int	 borderWidth)
{
    if (w->attrib.width        != width  ||
	w->attrib.height       != height ||
	w->attrib.border_width != borderWidth)
    {
	unsigned int pw, ph, actualWidth, actualHeight, ui;
	int	     dx, dy, dwidth, dheight;
	Pixmap	     pixmap = None;
	Window	     root;
	Status	     result;
	int	     i;

	pw = width  + borderWidth * 2;
	ph = height + borderWidth * 2;

	if (w->mapNum && w->redirected)
	{
	    pixmap = XCompositeNameWindowPixmap (w->screen->display->display,
						 w->id);
	    result = XGetGeometry (w->screen->display->display, pixmap, &root,
				   &i, &i, &actualWidth, &actualHeight,
				   &ui, &ui);

	    if (!result || actualWidth != pw || actualHeight != ph)
	    {
		XFreePixmap (w->screen->display->display, pixmap);

		return FALSE;
	    }
	}
	else if (w->shaded)
	{
	    ph = 0;
	}

	addWindowDamage (w);

	dx      = x - w->attrib.x;
	dy      = y - w->attrib.y;
	dwidth  = width - w->attrib.width;
	dheight = height - w->attrib.height;

	w->attrib.x	       = x;
	w->attrib.y	       = y;
	w->attrib.width	       = width;
	w->attrib.height       = height;
	w->attrib.border_width = borderWidth;

	if (!w->mapNum && w->unmapRefCnt > 0 &&
	    w->attrib.map_state == IsViewable)
	{
	    /* keep old pixmap for windows that are unmapped on the client side,
	     * but not yet on our side as it's pretty likely that plugins are
	     * currently using it for animations
	     */
	}
	else
	{
	    w->width  = pw;
	    w->height = ph;

	    releaseWindow (w);

	    w->pixmap = pixmap;
	}

	if (w->mapNum)
	    updateWindowRegion (w);

	(*w->screen->windowResizeNotify) (w, dx, dy, dwidth, dheight);

	addWindowDamage (w);

	w->invisible = WINDOW_INVISIBLE (w);

	updateFrameWindow (w);
    }
    else if (w->attrib.x != x || w->attrib.y != y)
    {
	int dx, dy;

	dx = x - w->attrib.x;
	dy = y - w->attrib.y;

	moveWindow (w, dx, dy, TRUE, TRUE);

	if (w->frame)
	    XMoveWindow (w->screen->display->display, w->frame,
			 w->attrib.x - w->input.left,
			 w->attrib.y - w->input.top);
    }

    return TRUE;
}

static void
syncValueIncrement (XSyncValue *value)
{
    XSyncValue one;
    int	       overflow;

    XSyncIntToValue (&one, 1);
    XSyncValueAdd (value, *value, one, &overflow);
}

static Bool
initializeSyncCounter (CompWindow *w)
{
    XSyncAlarmAttributes values;
    Atom		 actual;
    int			 result, format;
    unsigned long	 n, left;
    unsigned char	 *data;

    if (w->syncCounter)
	return w->syncAlarm != None;

    if (!(w->protocols & CompWindowProtocolSyncRequestMask))
	return FALSE;

    result = XGetWindowProperty (w->screen->display->display, w->id,
				 w->screen->display->wmSyncRequestCounterAtom,
				 0L, 1L, FALSE, XA_CARDINAL, &actual, &format,
				 &n, &left, &data);

    if (result == Success && n && data)
    {
	unsigned long *counter = (unsigned long *) data;

	w->syncCounter = *counter;

	XFree (data);

	XSyncIntsToValue (&w->syncValue, (unsigned int) rand (), 0);
	XSyncSetCounter (w->screen->display->display,
			 w->syncCounter,
			 w->syncValue);

	syncValueIncrement (&w->syncValue);

	values.events = TRUE;

	values.trigger.counter    = w->syncCounter;
	values.trigger.wait_value = w->syncValue;

	values.trigger.value_type = XSyncAbsolute;
	values.trigger.test_type  = XSyncPositiveComparison;

	XSyncIntToValue (&values.delta, 1);

	values.events = TRUE;

	compCheckForError (w->screen->display->display);

	/* Note that by default, the alarm increments the trigger value
	 * when it fires until the condition (counter.value < trigger.value)
	 * is FALSE again.
	 */
	w->syncAlarm = XSyncCreateAlarm (w->screen->display->display,
					 XSyncCACounter   |
					 XSyncCAValue     |
					 XSyncCAValueType |
					 XSyncCATestType  |
					 XSyncCADelta     |
					 XSyncCAEvents,
					 &values);

	if (!compCheckForError (w->screen->display->display))
	    return TRUE;

	XSyncDestroyAlarm (w->screen->display->display, w->syncAlarm);
	w->syncAlarm = None;
    }
    else if (result == Success && data)
    {
	XFree (data);
    }

    return FALSE;
}

static Bool
syncWaitTimeout (void *closure)
{
    CompWindow *w = closure;

    w->syncWaitHandle = 0;
    handleSyncAlarm (w);

    return FALSE;
}

void
sendSyncRequest (CompWindow *w)
{
    XClientMessageEvent xev;

    if (w->syncWait)
	return;

    if (!initializeSyncCounter (w))
	return;

    xev.type	     = ClientMessage;
    xev.window	     = w->id;
    xev.message_type = w->screen->display->wmProtocolsAtom;
    xev.format	     = 32;
    xev.data.l[0]    = w->screen->display->wmSyncRequestAtom;
    xev.data.l[1]    = CurrentTime;
    xev.data.l[2]    = XSyncValueLow32 (w->syncValue);
    xev.data.l[3]    = XSyncValueHigh32 (w->syncValue);
    xev.data.l[4]    = 0;

    syncValueIncrement (&w->syncValue);

    XSendEvent (w->screen->display->display, w->id, FALSE, 0, (XEvent *) &xev);

    w->syncWait	       = TRUE;
    w->syncX	       = w->serverX;
    w->syncY	       = w->serverY;
    w->syncWidth       = w->serverWidth;
    w->syncHeight      = w->serverHeight;
    w->syncBorderWidth = w->serverBorderWidth;

    if (!w->syncWaitHandle)
	w->syncWaitHandle = compAddTimeout (1000, 1200, syncWaitTimeout, w);
}

void
configureWindow (CompWindow	 *w,
		 XConfigureEvent *ce)
{
    if (w->syncWait)
    {
	w->syncX	   = ce->x;
	w->syncY	   = ce->y;
	w->syncWidth       = ce->width;
	w->syncHeight      = ce->height;
	w->syncBorderWidth = ce->border_width;
    }
    else
    {
	if (ce->override_redirect)
	{
	    w->serverX		 = ce->x;
	    w->serverY		 = ce->y;
	    w->serverWidth       = ce->width;
	    w->serverHeight      = ce->height;
	    w->serverBorderWidth = ce->border_width;
	}

	resizeWindow (w, ce->x, ce->y, ce->width, ce->height,
		      ce->border_width);
    }

    w->attrib.override_redirect = ce->override_redirect;

    if (restackWindow (w, ce->above))
	addWindowDamage (w);
}

void
circulateWindow (CompWindow	 *w,
		 XCirculateEvent *ce)
{
    Window newAboveId;

    if (ce->place == PlaceOnTop)
	newAboveId = getTopWindow (w->screen);
    else
	newAboveId = 0;

    if (restackWindow (w, newAboveId))
	addWindowDamage (w);
}

void
moveWindow (CompWindow *w,
	    int        dx,
	    int        dy,
	    Bool       damage,
	    Bool       immediate)
{
    if (dx || dy)
    {
	if (damage)
	    addWindowDamage (w);

	w->attrib.x += dx;
	w->attrib.y += dy;

	XOffsetRegion (w->region, dx, dy);

	setWindowMatrix (w);

	w->invisible = WINDOW_INVISIBLE (w);

	(*w->screen->windowMoveNotify) (w, dx, dy, immediate);

	if (damage)
	    addWindowDamage (w);
    }
}

void
syncWindowPosition (CompWindow *w)
{
    w->serverX = w->attrib.x;
    w->serverY = w->attrib.y;

    XMoveWindow (w->screen->display->display, w->id, w->attrib.x, w->attrib.y);

    if (w->frame)
	XMoveWindow (w->screen->display->display, w->frame,
		     w->serverX - w->input.left,
		     w->serverY - w->input.top);
}

Bool
focusWindow (CompWindow *w)
{
    if (w->attrib.override_redirect)
	return FALSE;

    if (!w->managed || w->unmanaging)
	return FALSE;

    if (w->destroyed)
	return FALSE;

    if (!onCurrentDesktop (w))
	return FALSE;

    if (!w->shaded && (w->state & CompWindowStateHiddenMask))
	return FALSE;

    if (w->attrib.x + w->width  <= 0	||
	w->attrib.y + w->height <= 0	||
	w->attrib.x >= w->screen->width ||
	w->attrib.y >= w->screen->height)
	return FALSE;

    return TRUE;
}

Bool
placeWindow (CompWindow *w,
	     int        x,
	     int        y,
	     int        *newX,
	     int        *newY)
{
    return FALSE;
}

void
validateWindowResizeRequest (CompWindow     *w,
			     unsigned int   *mask,
			     XWindowChanges *xwc,
			     unsigned int   source)
{
    CompScreen *s = w->screen;

    if (w->type & (CompWindowTypeDockMask       |
		   CompWindowTypeFullscreenMask |
		   CompWindowTypeUnknownMask))
	return;

    if (*mask & CWY)
    {
	int min, max;

	min = s->workArea.y + w->input.top;
	max = s->workArea.y + s->workArea.height;

	if (w->state & CompWindowStateStickyMask &&
	    (xwc->y < min || xwc->y > max))
	{
	    xwc->y = w->serverY;
	}
	else
	{
	    min -= s->y * s->height;
	    max += (s->vsize - s->y - 1) * s->height;

	    if (xwc->y < min)
		xwc->y = min;
	    else if (xwc->y > max)
		xwc->y = max;
	}
    }

    if (*mask & CWX)
    {
	int min, max;

	min = s->workArea.x + w->input.left;
	max = s->workArea.x + s->workArea.width;

	if (w->state & CompWindowStateStickyMask &&
	    (xwc->x < min || xwc->x > max))
	{
	    xwc->x = w->serverX;
	}
	else
	{
	    min -= s->x * s->width;
	    max += (s->hsize - s->x - 1) * s->width;

	    if (xwc->x < min)
		xwc->x = min;
	    else if (xwc->x > max)
		xwc->x = max;
	}
    }
}

void
windowResizeNotify (CompWindow *w,
		    int        dx,
		    int	       dy,
		    int	       dwidth,
		    int        dheight)
{
}

void
windowMoveNotify (CompWindow *w,
		  int	     dx,
		  int	     dy,
		  Bool	     immediate)
{
}

void
windowGrabNotify (CompWindow   *w,
		  int	       x,
		  int	       y,
		  unsigned int state,
		  unsigned int mask)
{
    w->grabbed = TRUE;
}

void
windowUngrabNotify (CompWindow *w)
{
    w->grabbed = FALSE;
}

void
windowStateChangeNotify (CompWindow   *w,
			 unsigned int lastState)
{
    /* if being made sticky */
    if (!(lastState & CompWindowStateStickyMask) &&
	(w->state & CompWindowStateStickyMask))
    {
	CompScreen *s = w->screen;
	int vpX;   /* x index of the window's vp */
	int vpY;   /* y index of the window's vp */

	/* Find which viewport the window falls in,
	   and check if it's the current viewport */
	defaultViewportForWindow (w, &vpX, &vpY);
	if (s->x != vpX || s->y != vpY)
	{
	    int moveX = (s->x - vpX) * s->width;
	    int moveY = (s->y - vpY) * s->height;

	    moveWindow (w, moveX, moveY, TRUE, TRUE);
	    syncWindowPosition (w);
	}
    }
}

static Bool
isGroupTransient (CompWindow *w,
		  Window     clientLeader)
{
    if (!clientLeader)
	return FALSE;

    if (w->transientFor == None || w->transientFor == w->screen->root)
    {
	if (w->type & (CompWindowTypeUtilMask    |
		       CompWindowTypeToolbarMask |
		       CompWindowTypeMenuMask    |
		       CompWindowTypeDialogMask  |
		       CompWindowTypeModalDialogMask))
	{
	    if (w->clientLeader == clientLeader)
		return TRUE;
	}
    }

    return FALSE;
}

static CompWindow *
getModalTransient (CompWindow *window)
{
    CompWindow *w, *modalTransient;

    modalTransient = window;

    for (w = window->screen->reverseWindows; w; w = w->prev)
    {
	if (w == modalTransient || w->mapNum == 0)
	    continue;

	if (w->transientFor == modalTransient->id)
	{
	    if (w->state & CompWindowStateModalMask)
	    {
		modalTransient = w;
		w = window->screen->reverseWindows;
	    }
	}
    }

    if (modalTransient == window)
    {
	/* don't look for group transients with modal state if current window
	   has modal state */
	if (window->state & CompWindowStateModalMask)
	    return NULL;

	for (w = window->screen->reverseWindows; w; w = w->prev)
	{
	    if (w == modalTransient || w->mapNum == 0)
		continue;

	    if (isAncestorTo (modalTransient, w))
		continue;

	    if (isGroupTransient (w, modalTransient->clientLeader))
	    {
		if (w->state & CompWindowStateModalMask)
		{
		    modalTransient = w;
		    w = getModalTransient (w);
		    if (w)
			modalTransient = w;

		    break;
		}
	    }
	}
    }

    if (modalTransient == window)
	modalTransient = NULL;

    return modalTransient;
}

void
moveInputFocusToWindow (CompWindow *w)
{
    CompScreen  *s = w->screen;
    CompDisplay *d = s->display;
    CompWindow  *modalTransient;

    modalTransient = getModalTransient (w);
    if (modalTransient)
	w = modalTransient;

    if (w->state & CompWindowStateHiddenMask)
    {
	XSetInputFocus (d->display, w->frame, RevertToPointerRoot, CurrentTime);
	XChangeProperty (d->display, s->root, d->winActiveAtom,
			 XA_WINDOW, 32, PropModeReplace,
			 (unsigned char *) &w->id, 1);
    }
    else
    {
	Bool setFocus = FALSE;

	if (w->inputHint)
	{
	    XSetInputFocus (d->display, w->id, RevertToPointerRoot,
			    CurrentTime);
	    setFocus = TRUE;
	}

	if (w->protocols & CompWindowProtocolTakeFocusMask)
	{
	    XEvent ev;

	    ev.type		    = ClientMessage;
	    ev.xclient.window	    = w->id;
	    ev.xclient.message_type = d->wmProtocolsAtom;
	    ev.xclient.format	    = 32;
	    ev.xclient.data.l[0]    = d->wmTakeFocusAtom;
	    ev.xclient.data.l[1]    =
		getCurrentTimeFromDisplay (d);
	    ev.xclient.data.l[2]    = 0;
	    ev.xclient.data.l[3]    = 0;
	    ev.xclient.data.l[4]    = 0;

	    XSendEvent (d->display, w->id, FALSE, NoEventMask, &ev);

	    setFocus = TRUE;
	}

	if (setFocus)
	    d->nextActiveWindow = w->id;

	if (!setFocus && !modalTransient)
	{
	    CompWindow *ancestor;

	    /* move input to closest ancestor */
	    for (ancestor = s->windows; ancestor; ancestor = ancestor->next)
	    {
		if (isAncestorTo (w, ancestor))
		{
		    moveInputFocusToWindow (ancestor);
		    break;
		}
	    }
	}
    }
}

static Bool
stackLayerCheck (CompWindow *w,
		 Window	    clientLeader,
		 CompWindow *below)
{
    if (isAncestorTo (w, below))
	return TRUE;

    if (isAncestorTo (below, w))
	return FALSE;

    if (clientLeader && below->clientLeader == clientLeader)
	if (isGroupTransient (below, clientLeader))
	    return FALSE;

    if (w->state & CompWindowStateAboveMask)
    {
	return TRUE;
    }
    else if (w->state & CompWindowStateBelowMask)
    {
	if (below->state & CompWindowStateBelowMask)
	    return TRUE;
    }
    else if (!(below->state & CompWindowStateAboveMask))
    {
	return TRUE;
    }

    return FALSE;
}

static Bool
avoidStackingRelativeTo (CompWindow *w)
{
    if (w->attrib.override_redirect)
	return TRUE;

    if (!w->shaded && !w->pendingMaps)
    {
	if (w->attrib.map_state != IsViewable || w->mapNum == 0)
	    return TRUE;
    }

    return FALSE;
}

/* goes through the stack, top-down until we find a window we should
   stack above, normal windows can be stacked above fullscreen windows
   (and fullscreen windows over others in their layer) if aboveFs
   is TRUE. */
static CompWindow *
findSiblingBelow (CompWindow *w,
		  Bool	     aboveFs)
{
    CompWindow   *below;
    Window	 clientLeader = w->clientLeader;
    unsigned int type = w->type;
    unsigned int belowMask;

    if (aboveFs)
	belowMask = CompWindowTypeDockMask;
    else
	belowMask = CompWindowTypeDockMask | CompWindowTypeFullscreenMask;

    /* normal stacking of fullscreen windows with below state */
    if ((type & CompWindowTypeFullscreenMask) &&
	(w->state & CompWindowStateBelowMask))
	type = CompWindowTypeNormalMask;

    if (w->transientFor || isGroupTransient (w, clientLeader))
	clientLeader = None;

    for (below = w->screen->reverseWindows; below; below = below->prev)
    {
	if (below == w || avoidStackingRelativeTo (below))
	    continue;

	/* always above desktop windows */
	if (below->type & CompWindowTypeDesktopMask)
	    return below;

	switch (type) {
	case CompWindowTypeDesktopMask:
	    /* desktop window layer */
	    break;
	case CompWindowTypeFullscreenMask:
	    if (aboveFs)
		return below;
	    /* otherwise fall-through */
	case CompWindowTypeDockMask:
	    /* fullscreen and dock layer */
	    if (below->type & (CompWindowTypeFullscreenMask |
			       CompWindowTypeDockMask))
	    {
		if (stackLayerCheck (w, clientLeader, below))
		    return below;
	    }
	    else
	    {
		return below;
	    }
	    break;
	default:
	    /* fullscreen and normal layer */
	    if (!(below->type & belowMask))
	    {
		if (stackLayerCheck (w, clientLeader, below))
		    return below;
	    }
	    break;
	}
    }

    return NULL;
}

/* goes through the stack, top-down and returns the lowest window we
   can stack above. */
static CompWindow *
findLowestSiblingBelow (CompWindow *w)
{
    CompWindow   *below, *lowest = w->screen->reverseWindows;
    Window	 clientLeader = w->clientLeader;
    unsigned int type = w->type;

    /* normal stacking fullscreen windows with below state */
    if ((type & CompWindowTypeFullscreenMask) &&
	(w->state & CompWindowStateBelowMask))
	type = CompWindowTypeNormalMask;

    if (w->transientFor || isGroupTransient (w, clientLeader))
	clientLeader = None;

    for (below = w->screen->reverseWindows; below; below = below->prev)
    {
	if (below == w || avoidStackingRelativeTo (below))
	    continue;

	/* always above desktop windows */
	if (below->type & CompWindowTypeDesktopMask)
	    return below;

	switch (type) {
	case CompWindowTypeDesktopMask:
	    /* desktop window layer - desktop windows always should be
	       stacked at the bottom; no other window should be below them */
	    return NULL;
	    break;
	case CompWindowTypeFullscreenMask:
	case CompWindowTypeDockMask:
	    /* fullscreen and dock layer */
	    if (below->type & (CompWindowTypeFullscreenMask |
			       CompWindowTypeDockMask))
	    {
		if (!stackLayerCheck (below, clientLeader, w))
		    return lowest;
	    }
	    else
	    {
		return lowest;
	    }
	    break;
	default:
	    /* fullscreen and normal layer */
	    if (!(below->type & CompWindowTypeDockMask))
	    {
		if (!stackLayerCheck (below, clientLeader, w))
		    return lowest;
	    }
	    break;
	}

	lowest = below;
    }

    return lowest;
}

static Bool
validSiblingBelow (CompWindow *w,
		   CompWindow *sibling)
{
    Window	 clientLeader = w->clientLeader;
    unsigned int type = w->type;

    /* normal stacking fullscreen windows with below state */
    if ((type & CompWindowTypeFullscreenMask) &&
	(w->state & CompWindowStateBelowMask))
	type = CompWindowTypeNormalMask;

    if (w->transientFor || isGroupTransient (w, clientLeader))
	clientLeader = None;

    if (sibling == w || avoidStackingRelativeTo (sibling))
	return FALSE;

    /* always above desktop windows */
    if (sibling->type & CompWindowTypeDesktopMask)
	return TRUE;

    switch (type) {
    case CompWindowTypeDesktopMask:
	/* desktop window layer */
	break;
    case CompWindowTypeFullscreenMask:
    case CompWindowTypeDockMask:
	/* fullscreen and dock layer */
	if (sibling->type & (CompWindowTypeFullscreenMask |
			     CompWindowTypeDockMask))
	{
	    if (stackLayerCheck (w, clientLeader, sibling))
		return TRUE;
	}
	else
	{
	    return TRUE;
	}
	break;
    default:
	/* fullscreen and normal layer */
	if (!(sibling->type & CompWindowTypeDockMask))
	{
	    if (stackLayerCheck (w, clientLeader, sibling))
		return TRUE;
	}
	break;
    }

    return FALSE;
}

static void
saveWindowGeometry (CompWindow *w,
		    int	       mask)
{
    int m = mask & ~w->saveMask;

    /* only save geometry if window has been placed */
    if (!w->placed)
	return;

    if (m & CWX)
	w->saveWc.x = w->serverX;

    if (m & CWY)
	w->saveWc.y = w->serverY;

    if (m & CWWidth)
	w->saveWc.width = w->serverWidth;

    if (m & CWHeight)
	w->saveWc.height = w->serverHeight;

    if (m & CWBorderWidth)
	w->saveWc.border_width = w->serverBorderWidth;

    w->saveMask |= m;
}

static int
restoreWindowGeometry (CompWindow     *w,
		       XWindowChanges *xwc,
		       int	      mask)
{
    int m = mask & w->saveMask;

    if (m & CWX)
	xwc->x = w->saveWc.x;

    if (m & CWY)
	xwc->y = w->saveWc.y;

    if (m & CWWidth)
    {
	xwc->width = w->saveWc.width;

	/* This is not perfect but it works OK for now. If the saved width is
	   the same as the current width then make it a little be smaller so
	   the user can see that it changed and it also makes sure that
	   windowResizeNotify is called and plugins are notified. */
	if (xwc->width == w->serverWidth)
	{
	    xwc->width -= 10;
	    if (m & CWX)
		xwc->x += 5;
	}
    }

    if (m & CWHeight)
    {
	xwc->height = w->saveWc.height;

	/* As above, if the saved height is the same as the current height
	   then make it a little be smaller. */
	if (xwc->height == w->serverHeight)
	{
	    xwc->height -= 10;
	    if (m & CWY)
		xwc->y += 5;
	}
    }

    if (m & CWBorderWidth)
	xwc->border_width = w->saveWc.border_width;

    w->saveMask &= ~mask;

    return m;
}

static void
reconfigureXWindow (CompWindow	   *w,
		    unsigned int   valueMask,
		    XWindowChanges *xwc)
{
    if (valueMask & CWX)
	w->serverX = xwc->x;

    if (valueMask & CWY)
	w->serverY = xwc->y;

    if (valueMask & CWWidth)
	w->serverWidth = xwc->width;

    if (valueMask & CWHeight)
	w->serverHeight	= xwc->height;

    if (valueMask & CWBorderWidth)
	w->serverBorderWidth = xwc->border_width;

    XConfigureWindow (w->screen->display->display, w->id, valueMask, xwc);

    if (w->frame && (valueMask & (CWSibling | CWStackMode)))
	XConfigureWindow (w->screen->display->display, w->frame,
			  valueMask & (CWSibling | CWStackMode), xwc);
}

static Bool
stackTransients (CompWindow	*w,
		 CompWindow	*avoid,
		 XWindowChanges *xwc)
{
    CompWindow *t;
    Window     clientLeader = w->clientLeader;

    if (w->transientFor || isGroupTransient (w, clientLeader))
	clientLeader = None;

    for (t = w->screen->reverseWindows; t; t = t->prev)
    {
	if (t == w || t == avoid)
	    continue;

	if (t->transientFor == w->id || isGroupTransient (t, clientLeader))
	{
	    if (w->type & CompWindowTypeDockMask)
		if (!(t->type & CompWindowTypeDockMask))
		    return FALSE;

	    if (!stackTransients (t, avoid, xwc))
		return FALSE;

	    if (xwc->sibling == t->id)
		return FALSE;

	    if (t->mapNum || t->pendingMaps)
		reconfigureXWindow (t, CWSibling | CWStackMode, xwc);
	}
    }

    return TRUE;
}

static void
stackAncestors (CompWindow     *w,
		XWindowChanges *xwc)
{
    if (w->transientFor && xwc->sibling != w->transientFor)
    {
	CompWindow *ancestor;

	ancestor = findWindowAtScreen (w->screen, w->transientFor);
	if (ancestor)
	{
	    if (!stackTransients (ancestor, w, xwc))
		return;

	    if (ancestor->type & CompWindowTypeDesktopMask)
		return;

	    if (ancestor->type & CompWindowTypeDockMask)
		if (!(w->type & CompWindowTypeDockMask))
		    return;

	    if (ancestor->mapNum || ancestor->pendingMaps)
		reconfigureXWindow (ancestor,
				    CWSibling | CWStackMode,
				    xwc);

	    stackAncestors (ancestor, xwc);
	}
    }
    else if (isGroupTransient (w, w->clientLeader))
    {
	CompWindow *a;

	for (a = w->screen->reverseWindows; a; a = a->prev)
	{
	    if (a->clientLeader == w->clientLeader &&
		a->transientFor == None		   &&
		!isGroupTransient (a, w->clientLeader))
	    {
		if (xwc->sibling == a->id)
		    break;

		if (!stackTransients (a, w, xwc))
		    break;

		if (a->type & CompWindowTypeDesktopMask)
		    continue;

		if (a->type & CompWindowTypeDockMask)
		    if (!(w->type & CompWindowTypeDockMask))
			break;

		if (a->mapNum || a->pendingMaps)
		    reconfigureXWindow (a,
					CWSibling | CWStackMode,
					xwc);
	    }
	}
    }
}

void
configureXWindow (CompWindow *w,
		  unsigned int valueMask,
		  XWindowChanges *xwc)
{
    if (w->managed && (valueMask & (CWSibling | CWStackMode)))
    {
	/* transient children above */
	if (stackTransients (w, NULL, xwc))
	{
	    reconfigureXWindow (w, valueMask, xwc);

	    /* ancestors, siblings and sibling transients below */
	    stackAncestors (w, xwc);
	}
    }
    else
    {
	reconfigureXWindow (w, valueMask, xwc);
    }
}

static int
addWindowSizeChanges (CompWindow     *w,
		      XWindowChanges *xwc,
		      int	     oldX,
		      int	     oldY,
		      int	     oldWidth,
		      int	     oldHeight,
		      int	     oldBorderWidth)
{
    XRectangle workArea;
    int	       mask = 0;
    int	       x, y;
    int	       vx, vy;
    int	       output;

    viewportForGeometry (w->screen,
			 oldX,
			 oldY,
			 oldWidth,
			 oldHeight,
			 oldBorderWidth,
			 &vx, &vy);

    x = (vx - w->screen->x) * w->screen->width;
    y = (vy - w->screen->y) * w->screen->height;

    output = outputDeviceForGeometry (w->screen,
				      oldX,
				      oldY,
				      oldWidth,
				      oldHeight,
				      oldBorderWidth);
    getWorkareaForOutput (w->screen, output, &workArea);

    if (w->type & CompWindowTypeFullscreenMask)
    {
	saveWindowGeometry (w, CWX | CWY | CWWidth | CWHeight | CWBorderWidth);

	if (w->fullscreenMonitorsSet)
	{
	    xwc->x      = x + w->fullscreenMonitorRect.x;
	    xwc->y      = y + w->fullscreenMonitorRect.y;
	    xwc->width  = w->fullscreenMonitorRect.width;
	    xwc->height = w->fullscreenMonitorRect.height;
	}
	else
	{
	    xwc->x      = x + w->screen->outputDev[output].region.extents.x1;
	    xwc->y      = y + w->screen->outputDev[output].region.extents.y1;
	    xwc->width  = w->screen->outputDev[output].width;
	    xwc->height = w->screen->outputDev[output].height;
	}

	xwc->border_width = 0;

	mask |= CWX | CWY | CWWidth | CWHeight | CWBorderWidth;
    }
    else
    {
	mask |= restoreWindowGeometry (w, xwc, CWBorderWidth);

	if (w->state & CompWindowStateMaximizedVertMask)
	{
	    saveWindowGeometry (w, CWY | CWHeight);

	    xwc->height = workArea.height - w->input.top -
		w->input.bottom - oldBorderWidth * 2;

	    mask |= CWHeight;
	}
	else
	{
	    mask |= restoreWindowGeometry (w, xwc, CWY | CWHeight);
	}

	if (w->state & CompWindowStateMaximizedHorzMask)
	{
	    saveWindowGeometry (w, CWX | CWWidth);

	    xwc->width = workArea.width - w->input.left -
		w->input.right - oldBorderWidth * 2;

	    mask |= CWWidth;
	}
	else
	{
	    mask |= restoreWindowGeometry (w, xwc, CWX | CWWidth);
	}

	/* constrain window width if smaller than minimum width */
	if (!(mask & CWWidth) && oldWidth < w->sizeHints.min_width)
	{
	    xwc->width = w->sizeHints.min_width;
	    mask |= CWWidth;
	}

	/* constrain window width if greater than maximum width */
	if (!(mask & CWWidth) && oldWidth > w->sizeHints.max_width)
	{
	    xwc->width = w->sizeHints.max_width;
	    mask |= CWWidth;
	}

	/* constrain window height if smaller than minimum height */
	if (!(mask & CWHeight) && oldHeight < w->sizeHints.min_height)
	{
	    xwc->height = w->sizeHints.min_height;
	    mask |= CWHeight;
	}

	/* constrain window height if greater than maximum height */
	if (!(mask & CWHeight) && oldHeight > w->sizeHints.max_height)
	{
	    xwc->height = w->sizeHints.max_height;
	    mask |= CWHeight;
	}

	if (mask & (CWWidth | CWHeight))
	{
	    int width, height, max;

	    width  = (mask & CWWidth)  ? xwc->width  : oldWidth;
	    height = (mask & CWHeight) ? xwc->height : oldHeight;

	    xwc->width  = oldWidth;
	    xwc->height = oldHeight;

	    constrainNewWindowSize (w, width, height, &width, &height);

	    if (width != oldWidth)
	    {
		mask |= CWWidth;
		xwc->width = width;
	    }
	    else
		mask &= ~CWWidth;

	    if (height != oldHeight)
	    {
		mask |= CWHeight;
		xwc->height = height;
	    }
	    else
		mask &= ~CWHeight;

	    if (w->state & CompWindowStateMaximizedVertMask)
	    {
		if (oldY < y + workArea.y + w->input.top)
		{
		    xwc->y = y + workArea.y + w->input.top;
		    mask |= CWY;
		}
		else
		{
		    height = xwc->height + oldBorderWidth * 2;

		    max = y + workArea.y + workArea.height;
		    if (oldY + oldHeight + w->input.bottom > max)
		    {
			xwc->y = max - height - w->input.bottom;
			mask |= CWY;
		    }
		    else if (oldY + height + w->input.bottom > max)
		    {
			xwc->y = y + workArea.y +
			    (workArea.height - w->input.top - height -
			     w->input.bottom) / 2 + w->input.top;
			mask |= CWY;
		    }
		}
	    }

	    if (w->state & CompWindowStateMaximizedHorzMask)
	    {
		if (oldX < x + workArea.x + w->input.left)
		{
		    xwc->x = x + workArea.x + w->input.left;
		    mask |= CWX;
		}
		else
		{
		    width = xwc->width + oldBorderWidth * 2;

		    max = x + workArea.x + workArea.width;
		    if (oldX + oldWidth + w->input.right > max)
		    {
			xwc->x = max - width - w->input.right;
			mask |= CWX;
		    }
		    else if (oldX + width + w->input.right > max)
		    {
			xwc->x = x + workArea.x +
			    (workArea.width - w->input.left - width -
			     w->input.right) / 2 + w->input.left;
			mask |= CWX;
		    }
		}
	    }
	}
    }

    if ((mask & CWX) && (xwc->x == oldX))
	mask &= ~CWX;

    if ((mask & CWY) && (xwc->y == oldY))
	mask &= ~CWY;

    if ((mask & CWWidth) && (xwc->width == oldWidth))
	mask &= ~CWWidth;

    if ((mask & CWHeight) && (xwc->height == oldHeight))
	mask &= ~CWHeight;

    return mask;
}

unsigned int
adjustConfigureRequestForGravity (CompWindow     *w,
				  XWindowChanges *xwc,
				  unsigned int   xwcm,
				  int            gravity,
				  int            direction)
{
    int          newX, newY;
    unsigned int mask = 0;

    newX = xwc->x;
    newY = xwc->y;

    if (xwcm & (CWX | CWWidth))
    {
	switch (gravity) {
	case NorthWestGravity:
	case WestGravity:
	case SouthWestGravity:
	    if (xwcm & CWX)
		newX += w->input.left;
	    break;

	case NorthGravity:
	case CenterGravity:
	case SouthGravity:
	    if (xwcm & CWX)
		newX -= xwc->width / 2 - w->input.left +
			(w->input.left + w->input.right) / 2;
	    else
		newX -= (xwc->width - w->serverWidth) / 2;
	    break;

	case NorthEastGravity:
	case EastGravity:
	case SouthEastGravity:
	    if (xwcm & CWX)
		newX -= xwc->width + w->input.right;
	    else
		newX -= xwc->width - w->serverWidth;
	    break;

	case StaticGravity:
	default:
	    break;
	}
    }

    if (xwcm & (CWY | CWHeight))
    {
	switch (gravity) {
	case NorthWestGravity:
	case NorthGravity:
	case NorthEastGravity:
	    if (xwcm & CWY)
		newY += w->input.top;
	    break;

	case WestGravity:
	case CenterGravity:
	case EastGravity:
	    if (xwcm & CWY)
		newY -= xwc->height / 2 - w->input.top +
			(w->input.top + w->input.bottom) / 2;
	    else
		newY -= (xwc->height - w->serverHeight) / 2;
	    break;

	case SouthWestGravity:
	case SouthGravity:
	case SouthEastGravity:
	    if (xwcm & CWY)
		newY -= xwc->height + w->input.bottom;
	    else
		newY -= xwc->height - w->serverHeight;
	    break;

	case StaticGravity:
	default:
	    break;
	}
    }

    if (newX != xwc->x)
    {
	xwc->x += (newX - xwc->x) * direction;
	mask |= CWX;
    }

    if (newY != xwc->y)
    {
	xwc->y += (newY - xwc->y) * direction;
	mask |= CWY;
    }

    return mask;
}

void
moveResizeWindow (CompWindow     *w,
		  XWindowChanges *xwc,
		  unsigned int   xwcm,
		  int            gravity,
		  unsigned int   source)
{
    Bool placed = FALSE;

    xwcm &= (CWX | CWY | CWWidth | CWHeight | CWBorderWidth);

    if (xwcm & (CWX | CWY))
	if (w->sizeHints.flags & (USPosition | PPosition))
	    placed = TRUE;

    if (gravity == 0)
	gravity = w->sizeHints.win_gravity;

    if (!(xwcm & CWX))
	xwc->x = w->serverX;
    if (!(xwcm & CWY))
	xwc->y = w->serverY;
    if (!(xwcm & CWWidth))
	xwc->width = w->serverWidth;
    if (!(xwcm & CWHeight))
	xwc->height = w->serverHeight;

    /* when horizontally maximized only allow width changes added by
       addWindowSizeChanges or constrainNewWindowState */
    if (w->state & CompWindowStateMaximizedHorzMask)
	xwcm &= ~CWWidth;

    /* when vertically maximized only allow height changes added by
       addWindowSizeChanges or constrainNewWindowState */
    if (w->state & CompWindowStateMaximizedVertMask)
	xwcm &= ~CWHeight;

    if (xwcm & (CWWidth | CWHeight))
    {
	int width, height;

	if (constrainNewWindowSize (w,
				    xwc->width, xwc->height,
				    &width, &height))
	{
	    if (width != xwc->width)
		xwcm |= CWWidth;

	    if (height != xwc->height)
		xwcm |= CWHeight;

	    xwc->width = width;
	    xwc->height = height;
	}
    }

    xwcm |= adjustConfigureRequestForGravity (w, xwc, xwcm, gravity, 1);

    (*w->screen->validateWindowResizeRequest) (w, &xwcm, xwc, source);

    xwcm |= addWindowSizeChanges (w, xwc,
				  xwc->x, xwc->y,
				  xwc->width, xwc->height,
				  xwc->border_width);

    /* check if the new coordinates are useful and valid (different
       to current size); if not, we have to clear them to make sure
       we send a synthetic ConfigureNotify event if all coordinates
       match the server coordinates */
    if (xwc->x == w->serverX)
	xwcm &= ~CWX;

    if (xwc->y == w->serverY)
	xwcm &= ~CWY;

    if (xwc->width == w->serverWidth)
	xwcm &= ~CWWidth;

    if (xwc->height == w->serverHeight)
	xwcm &= ~CWHeight;

    if (xwc->border_width == w->serverBorderWidth)
	xwcm &= ~CWBorderWidth;

    /* update saved window coordinates - if CWX or CWY is set for fullscreen
       or maximized windows after addWindowSizeChanges, it should be pretty
       safe to assume that the saved coordinates should be updated too, e.g.
       because the window was moved to another viewport by some client */
    if ((xwcm & CWX) && (w->saveMask & CWX))
	w->saveWc.x += (xwc->x - w->serverX);

    if ((xwcm & CWY) && (w->saveMask & CWY))
	w->saveWc.y += (xwc->y - w->serverY);

    if (w->mapNum && (xwcm & (CWWidth | CWHeight)))
	sendSyncRequest (w);

    if (xwcm)
	configureXWindow (w, xwcm, xwc);
    else
    {
	/* we have to send a configure notify on ConfigureRequest events if
	   we decide not to do anything according to ICCCM 4.1.5 */
	sendConfigureNotify (w);
    }

    if (placed)
	w->placed = TRUE;
}

void
updateWindowSize (CompWindow *w)
{
    XWindowChanges xwc;
    int		   mask;

    if (w->attrib.override_redirect || !w->managed)
	return;

    mask = addWindowSizeChanges (w, &xwc,
				 w->serverX, w->serverY,
				 w->serverWidth, w->serverHeight,
				 w->serverBorderWidth);
    if (mask)
    {
	if (w->mapNum && (mask & (CWWidth | CWHeight)))
	    sendSyncRequest (w);

	configureXWindow (w, mask, &xwc);
    }
}

static int
addWindowStackChanges (CompWindow     *w,
		       XWindowChanges *xwc,
		       CompWindow     *sibling)
{
    int	mask = 0;

    if (!sibling || sibling->id != w->id)
    {
	CompWindow *prev = w->prev;

	/* the frame window is always our next sibling window in the stack,
	   although we're searching for the next 'real' sibling, so skip
	   the frame window */
	if (prev && prev->id == w->frame)
		prev = prev->prev;

	if (prev)
	{
	    if (!sibling)
	    {
		XLowerWindow (w->screen->display->display, w->id);
		if (w->frame)
		    XLowerWindow (w->screen->display->display, w->frame);
	    }
	    else if (sibling->id != prev->id)
	    {
		mask |= CWSibling | CWStackMode;

		xwc->stack_mode = Above;
		xwc->sibling    = sibling->id;
	    }
	}
	else if (sibling)
	{
	    mask |= CWSibling | CWStackMode;

	    xwc->stack_mode = Above;
	    xwc->sibling    = sibling->id;
	}
    }

    if (sibling && mask)
    {
	/* a normal window can be stacked above fullscreen windows but we
	   don't want normal windows to be stacked above dock window so if
	   the sibling we're stacking above is a fullscreen window we also
	   update all dock windows. */
	if ((sibling->type & CompWindowTypeFullscreenMask) &&
	    (!(w->type & (CompWindowTypeFullscreenMask |
			  CompWindowTypeDockMask))) &&
	    !isAncestorTo (w, sibling))
	{
	    CompWindow *dw;

	    for (dw = w->screen->reverseWindows; dw; dw = dw->prev)
		if (dw == sibling)
		    break;

	    for (; dw; dw = dw->prev)
		if (dw->type & CompWindowTypeDockMask)
		    configureXWindow (dw, mask, xwc);
	}
    }

    return mask;
}

void
raiseWindow (CompWindow *w)
{
    XWindowChanges xwc;
    int		   mask;
    Bool           aboveFs = FALSE;

    /* an active fullscreen window should be raised over all other
       windows in its layer */
    if (w->type & CompWindowTypeFullscreenMask)
	if (w->id == w->screen->display->activeWindow)
	    aboveFs = TRUE;

    mask = addWindowStackChanges (w, &xwc, findSiblingBelow (w, aboveFs));
    if (mask)
	configureXWindow (w, mask, &xwc);
}

static CompWindow *
focusTopmostWindow (CompScreen *s)
{
    CompDisplay *d = s->display;
    CompWindow  *w;
    CompWindow  *focus = NULL;

    for (w = s->reverseWindows; w; w = w->prev)
    {
	if (w->type & CompWindowTypeDockMask)
	    continue;

	if ((*s->focusWindow) (w))
	{
	    focus = w;
	    break;
	}
    }

    if (focus)
    {
	if (focus->id != d->activeWindow)
	    moveInputFocusToWindow (focus);
    }
    else
	XSetInputFocus (d->display, s->root, RevertToPointerRoot,
			CurrentTime);

    return focus;
}

void
lowerWindow (CompWindow *w)
{
    XWindowChanges xwc;
    int		   mask;
    CompDisplay    *d = w->screen->display;

    mask = addWindowStackChanges (w, &xwc, findLowestSiblingBelow (w));
    if (mask)
	configureXWindow (w, mask, &xwc);

    /* when lowering a window, focus the topmost window if the click-to-focus option is on */
    if (d->opt[COMP_DISPLAY_OPTION_CLICK_TO_FOCUS].value.b)
    {
	Window     aboveId = w->prev ? w->prev->id : None;
	CompWindow *focusedWindow;

	unhookWindowFromScreen (w->screen, w);
	focusedWindow = focusTopmostWindow (w->screen);
	insertWindowIntoScreen (w->screen, w, aboveId);

	/* if the newly focused window is a desktop window,
	   give the focus back to w */
	if (focusedWindow && focusedWindow->type & CompWindowTypeDesktopMask)
	    moveInputFocusToWindow (w);
    }
}

void
restackWindowAbove (CompWindow *w,
		    CompWindow *sibling)
{
    for (; sibling; sibling = sibling->next)
	if (validSiblingBelow (w, sibling))
	    break;

    if (sibling)
    {
	XWindowChanges xwc;
	int	       mask;

	mask = addWindowStackChanges (w, &xwc, sibling);
	if (mask)
	    configureXWindow (w, mask, &xwc);
    }
}

/* finds the highest window under sibling we can stack above */
static CompWindow *
findValidStackSiblingBelow (CompWindow *w,
			    CompWindow *sibling)
{
    CompWindow *lowest, *last, *p;

    /* check whether we're actually allowed to stack under sibling by
       finding the sibling above 'sibling' and checking whether we're
       allowed to stack under that - if not, there's no valid sibling
       under it */
    for (p = sibling; p; p = p->next)
    {
	if (!avoidStackingRelativeTo (p))
	{
	    if (!validSiblingBelow (p, w))
		return NULL;
	    break;
	}
    }

    /* get lowest sibling we're allowed to stack above */
    lowest = last = findLowestSiblingBelow (w);

    /* walk from bottom up */
    for (p = w->screen->windows; p; p = p->next)
    {
	/* stop walking when we reach the sibling we should try to stack
	   below */
	if (p == sibling)
	    return lowest;

	/* skip windows that we should avoid */
	if (w == p || avoidStackingRelativeTo (p))
	    continue;

	if (validSiblingBelow (w, p))
	{
	    /* update lowest as we find windows below sibling that we're
	       allowed to stack above. last window must be equal to the
	       lowest as we shouldn't update lowest if we passed an
	       invalid window */
	    if (last == lowest)
		lowest = p;
	}

	/* update last pointer */
	last = p;
    }

    return lowest;
}

void
restackWindowBelow (CompWindow *w,
		    CompWindow *sibling)
{
    XWindowChanges xwc;
    unsigned int   mask;

    mask = addWindowStackChanges (w, &xwc,
				  findValidStackSiblingBelow (w, sibling));

    if (mask)
	configureXWindow (w, mask, &xwc);
}

void
updateWindowAttributes (CompWindow             *w,
			CompStackingUpdateMode stackingMode)
{
    XWindowChanges xwc;
    int		   mask = 0;

    if (w->attrib.override_redirect || !w->managed)
	return;

    if (w->state & CompWindowStateShadedMask)
    {
	hideWindow (w);
    }
    else if (w->shaded)
    {
	showWindow (w);
    }

    if (stackingMode != CompStackingUpdateModeNone)
    {
	Bool       aboveFs;
	CompWindow *sibling;

	aboveFs = (stackingMode == CompStackingUpdateModeAboveFullscreen);
	if (w->type & CompWindowTypeFullscreenMask)
	{
	    /* put active or soon-to-be-active fullscreen windows over
	       all others in their layer */
	    if (w->id == w->screen->display->activeWindow)
	    {
		aboveFs = TRUE;
	    }
	}

	/* put windows that are just mapped, over fullscreen windows */
	if (stackingMode == CompStackingUpdateModeInitialMap)
	    aboveFs = TRUE;

	sibling = findSiblingBelow (w, aboveFs);

	if (sibling &&
	    (stackingMode == CompStackingUpdateModeInitialMapDeniedFocus))
	{
	    CompWindow *p;

	    for (p = sibling; p; p = p->prev)
		if (p->id == w->screen->display->activeWindow)
		    break;

	    /* window is above active window so we should lower it, assuming that
	     * is allowed (if, for example, our window has the "above" state,
	     * then lowering beneath the active window may not be allowed.)
	     */
	    if (p && validSiblingBelow (p, w))
	    {
		p = findValidStackSiblingBelow (sibling, p);

		/* if we found a valid sibling under the active window, it's
		   our new sibling we want to stack above */
		if (p)
		    sibling = p;
	    }
	}

	mask |= addWindowStackChanges (w, &xwc, sibling);
    }

    if ((stackingMode == CompStackingUpdateModeInitialMap) ||
	(stackingMode == CompStackingUpdateModeInitialMapDeniedFocus))
    {
	/* If we are called from the MapRequest handler, we have to
	   immediately update the internal stack. If we don't do that,
	   the internal stacking order is invalid until the ConfigureNotify
	   arrives because we put the window at the top of the stack when
	   it was created */
	if (mask & CWStackMode)
	{
	    Window above = (mask & CWSibling) ? xwc.sibling : 0;
	    restackWindow (w, above);
	}
    }

    mask |= addWindowSizeChanges (w, &xwc,
				  w->serverX, w->serverY,
				  w->serverWidth, w->serverHeight,
				  w->serverBorderWidth);

    if (w->mapNum && (mask & (CWWidth | CWHeight)))
	sendSyncRequest (w);

    if (mask)
	configureXWindow (w, mask, &xwc);
}

static void
ensureWindowVisibility (CompWindow *w)
{
    int x1, y1, x2, y2;
    int	width = w->serverWidth + w->serverBorderWidth * 2;
    int	height = w->serverHeight + w->serverBorderWidth * 2;
    int dx = 0;
    int dy = 0;

    if (w->struts || w->attrib.override_redirect)
	return;

    if (w->type & (CompWindowTypeDockMask	|
		   CompWindowTypeFullscreenMask |
		   CompWindowTypeUnknownMask))
	return;

    x1 = w->screen->workArea.x - w->screen->width * w->screen->x;
    y1 = w->screen->workArea.y - w->screen->height * w->screen->y;
    x2 = x1 + w->screen->workArea.width + w->screen->hsize * w->screen->width;
    y2 = y1 + w->screen->workArea.height + w->screen->vsize * w->screen->height;

    if (w->serverX - w->input.left >= x2)
	dx = (x2 - 25) - w->serverX;
    else if (w->serverX + width + w->input.right <= x1)
	dx = (x1 + 25) - (w->serverX + width);

    if (w->serverY - w->input.top >= y2)
	dy = (y2 - 25) - w->serverY;
    else if (w->serverY + height + w->input.bottom <= y1)
	dy = (y1 + 25) - (w->serverY + height);

    if (dx || dy)
    {
	XWindowChanges xwc;

	xwc.x = w->serverX + dx;
	xwc.y = w->serverY + dy;

	configureXWindow (w, CWX | CWY, &xwc);
    }
}

static void
revealWindow (CompWindow *w)
{
    if (w->minimized)
	unminimizeWindow (w);

    (*w->screen->leaveShowDesktopMode) (w->screen, w);
}

static void
revealAncestors (CompWindow *w,
		 void       *closure)
{
    CompWindow *transient = closure;

    if (isAncestorTo (transient, w))
    {
	forEachWindowOnScreen (w->screen, revealAncestors, (void *) w);
	revealWindow (w);
    }
}

void
activateWindow (CompWindow *w)
{
    setCurrentDesktop (w->screen, w->desktop);

    forEachWindowOnScreen (w->screen, revealAncestors, (void *) w);
    revealWindow (w);

    if (w->state & CompWindowStateHiddenMask)
    {
	w->state &= ~CompWindowStateShadedMask;
	if (w->shaded)
	    showWindow (w);
    }

    if (w->state & CompWindowStateHiddenMask)
	return;

    if (!onCurrentDesktop (w))
	return;

    ensureWindowVisibility (w);
    updateWindowAttributes (w, CompStackingUpdateModeAboveFullscreen);
    moveInputFocusToWindow (w);
}

void
closeWindow (CompWindow *w,
	     Time	serverTime)
{
    CompDisplay *display = w->screen->display;

    if (serverTime == 0)
	serverTime = getCurrentTimeFromDisplay (display);

    if (w->alive)
    {
	if (w->protocols & CompWindowProtocolDeleteMask)
	{
	    XEvent ev;

	    ev.type		    = ClientMessage;
	    ev.xclient.window	    = w->id;
	    ev.xclient.message_type = display->wmProtocolsAtom;
	    ev.xclient.format	    = 32;
	    ev.xclient.data.l[0]    = display->wmDeleteWindowAtom;
	    ev.xclient.data.l[1]    = serverTime;
	    ev.xclient.data.l[2]    = 0;
	    ev.xclient.data.l[3]    = 0;
	    ev.xclient.data.l[4]    = 0;

	    XSendEvent (display->display, w->id, FALSE, NoEventMask, &ev);
	}
	else
	{
	    XKillClient (display->display, w->id);
	}

	w->closeRequests++;
    }
    else
    {
	toolkitAction (w->screen,
		       w->screen->display->toolkitActionForceQuitDialogAtom,
		       serverTime,
		       w->id,
		       TRUE,
		       0,
		       0);
    }

    w->lastCloseRequestTime = serverTime;
}

#define PVertResizeInc (1 << 0)
#define PHorzResizeInc (1 << 1)

Bool
constrainNewWindowSize (CompWindow *w,
			int        width,
			int        height,
			int        *newWidth,
			int        *newHeight)
{
    CompDisplay      *d = w->screen->display;
    const XSizeHints *hints = &w->sizeHints;
    int              oldWidth = width;
    int              oldHeight = height;
    int		     min_width = 0;
    int		     min_height = 0;
    int		     base_width = 0;
    int		     base_height = 0;
    int		     xinc = 1;
    int		     yinc = 1;
    int		     max_width = MAXSHORT;
    int		     max_height = MAXSHORT;
    long	     flags = hints->flags;
    long	     resizeIncFlags = (flags & PResizeInc) ? ~0 : 0;

    if (d->opt[COMP_DISPLAY_OPTION_IGNORE_HINTS_WHEN_MAXIMIZED].value.b)
    {
	if (w->state & MAXIMIZE_STATE)
	{
	    flags &= ~PAspect;

	    if (w->state & CompWindowStateMaximizedHorzMask)
		resizeIncFlags &= ~PHorzResizeInc;

	    if (w->state & CompWindowStateMaximizedVertMask)
		resizeIncFlags &= ~PVertResizeInc;
	}
    }

    /* Ater gdk_window_constrain_size(), which is partially borrowed from fvwm.
     *
     * Copyright 1993, Robert Nation
     *     You may use this code for any purpose, as long as the original
     *     copyright remains in the source code and all documentation
     *
     * which in turn borrows parts of the algorithm from uwm
     */

#define FLOOR(value, base) (((int) ((value) / (base))) * (base))
#define FLOOR64(value, base) (((uint64_t) ((value) / (base))) * (base))
#define CLAMP(v, min, max) ((v) <= (min) ? (min) : (v) >= (max) ? (max) : (v))

    if ((flags & PBaseSize) && (flags & PMinSize))
    {
	base_width = hints->base_width;
	base_height = hints->base_height;
	min_width = hints->min_width;
	min_height = hints->min_height;
    }
    else if (flags & PBaseSize)
    {
	base_width = hints->base_width;
	base_height = hints->base_height;
	min_width = hints->base_width;
	min_height = hints->base_height;
    }
    else if (flags & PMinSize)
    {
	base_width = hints->min_width;
	base_height = hints->min_height;
	min_width = hints->min_width;
	min_height = hints->min_height;
    }

    if (flags & PMaxSize)
    {
	max_width = hints->max_width;
	max_height = hints->max_height;
    }

    if (resizeIncFlags & PHorzResizeInc)
	xinc = MAX (xinc, hints->width_inc);

    if (resizeIncFlags & PVertResizeInc)
	yinc = MAX (yinc, hints->height_inc);

    /* clamp width and height to min and max values */
    width  = CLAMP (width, min_width, max_width);
    height = CLAMP (height, min_height, max_height);

    /* shrink to base + N * inc */
    width  = base_width + FLOOR (width - base_width, xinc);
    height = base_height + FLOOR (height - base_height, yinc);

    /* constrain aspect ratio, according to:
     *
     * min_aspect.x       width      max_aspect.x
     * ------------  <= -------- <=  -----------
     * min_aspect.y       height     max_aspect.y
     */
    if ((flags & PAspect) && hints->min_aspect.y > 0 && hints->max_aspect.x > 0)
    {
	/* Use 64 bit arithmetic to prevent overflow */

	uint64_t min_aspect_x = hints->min_aspect.x;
	uint64_t min_aspect_y = hints->min_aspect.y;
	uint64_t max_aspect_x = hints->max_aspect.x;
	uint64_t max_aspect_y = hints->max_aspect.y;
	uint64_t delta;

	if (min_aspect_x * height > width * min_aspect_y)
	{
	    delta = FLOOR64 (height - width * min_aspect_y / min_aspect_x,
			     yinc);
	    if (height - delta >= min_height)
		height -= delta;
	    else
	    {
		delta = FLOOR64 (height * min_aspect_x / min_aspect_y - width,
				 xinc);
		if (width + delta <= max_width)
		    width += delta;
	    }
	}

	if (width * max_aspect_y > max_aspect_x * height)
	{
	    delta = FLOOR64 (width - height * max_aspect_x / max_aspect_y,
			     xinc);
	    if (width - delta >= min_width)
		width -= delta;
	    else
	    {
		delta = FLOOR64 (width * min_aspect_y / min_aspect_x - height,
				 yinc);
		if (height + delta <= max_height)
		    height += delta;
	    }
	}
    }

#undef CLAMP
#undef FLOOR64
#undef FLOOR

    if (width != oldWidth || height != oldHeight)
    {
	*newWidth  = width;
	*newHeight = height;

	return TRUE;
    }

    return FALSE;
}

void
hideWindow (CompWindow *w)
{
    Bool onDesktop = onCurrentDesktop (w);

    if (!w->managed)
	return;

    if (!w->minimized && !w->inShowDesktopMode && !w->hidden && onDesktop)
    {
	if (w->state & CompWindowStateShadedMask)
	{
	    w->shaded = TRUE;
	}
	else
	{
	    return;
	}
    }
    else
    {
	addWindowDamage (w);

	w->shaded = FALSE;

	if ((w->state & CompWindowStateShadedMask) && w->frame)
	    XUnmapWindow (w->screen->display->display, w->frame);
    }

    if (!w->pendingMaps && w->attrib.map_state != IsViewable)
	return;

    w->pendingUnmaps++;

    XUnmapWindow (w->screen->display->display, w->id);

    if (w->minimized || w->inShowDesktopMode || w->hidden || w->shaded)
	changeWindowState (w, w->state | CompWindowStateHiddenMask);

    if (w->shaded && w->id == w->screen->display->activeWindow)
	moveInputFocusToWindow (w);
}

void
showWindow (CompWindow *w)
{
    Bool onDesktop = onCurrentDesktop (w);

    if (!w->managed)
	return;

    if (w->minimized || w->inShowDesktopMode || w->hidden || !onDesktop)
    {
	/* no longer hidden but not on current desktop */
	if (!w->minimized && !w->inShowDesktopMode && !w->hidden)
	    changeWindowState (w, w->state & ~CompWindowStateHiddenMask);

	return;
    }

    /* transition from minimized to shaded */
    if (w->state & CompWindowStateShadedMask)
    {
	w->shaded = TRUE;

	if (w->frame)
	    XMapWindow (w->screen->display->display, w->frame);

	if (w->height)
	    resizeWindow (w,
			  w->attrib.x, w->attrib.y,
			  w->attrib.width, ++w->attrib.height - 1,
			  w->attrib.border_width);

	addWindowDamage (w);

	return;
    }
    else
    {
	w->shaded = FALSE;
    }

    w->pendingMaps++;

    XMapWindow (w->screen->display->display, w->id);

    changeWindowState (w, w->state & ~CompWindowStateHiddenMask);
    setWindowState (w->screen->display, w->state, w->id);
}

static void
minimizeTransients (CompWindow *w,
		    void       *closure)
{
    CompWindow *ancestor = closure;

    if (w->transientFor == ancestor->id ||
	isGroupTransient (w, ancestor->clientLeader))
    {
	minimizeWindow (w);
    }
}

void
minimizeWindow (CompWindow *w)
{
    if (!w->managed)
	return;

    if (!w->minimized)
    {
	w->minimized = TRUE;

	forEachWindowOnScreen (w->screen, minimizeTransients, (void *) w);

	hideWindow (w);
    }
}

static void
unminimizeTransients (CompWindow *w,
		      void       *closure)
{
    CompWindow *ancestor = closure;

    if (w->transientFor == ancestor->id ||
	isGroupTransient (w, ancestor->clientLeader))
	unminimizeWindow (w);
}

void
unminimizeWindow (CompWindow *w)
{
    if (w->minimized)
    {
	w->minimized = FALSE;

	showWindow (w);

	forEachWindowOnScreen (w->screen, unminimizeTransients, (void *) w);
    }
}

void
maximizeWindow (CompWindow *w,
		int	   state)
{
    if (w->attrib.override_redirect)
	return;

    state = constrainWindowState (state, w->actions);

    state &= MAXIMIZE_STATE;

    if (state == (w->state & MAXIMIZE_STATE))
	return;

    state |= (w->state & ~MAXIMIZE_STATE);

    changeWindowState (w, state);
    updateWindowAttributes (w, CompStackingUpdateModeNone);
}

Bool
getWindowUserTime (CompWindow *w,
		   Time       *time)
{
    Atom	  actual;
    int		  result, format;
    unsigned long n, left;
    unsigned char *data;
    Bool          retval = FALSE;

    result = XGetWindowProperty (w->screen->display->display, w->id,
				 w->screen->display->wmUserTimeAtom,
				 0L, 1L, False, XA_CARDINAL, &actual, &format,
				 &n, &left, &data);

    if (result == Success && data)
    {
	if (n)
	{
	    CARD32 value;

	    memcpy (&value, data, sizeof (CARD32));
	    retval = TRUE;
	    *time = (Time) value;
	}

	XFree ((void *) data);
    }

    return retval;
}

void
setWindowUserTime (CompWindow *w,
		   Time       time)
{
    CARD32 value = (CARD32) time;

    XChangeProperty (w->screen->display->display, w->id,
		     w->screen->display->wmUserTimeAtom,
		     XA_CARDINAL, 32, PropModeReplace,
		     (unsigned char *) &value, 1);
}

/*
 * Macros from metacity
 *
 * Xserver time can wraparound, thus comparing two timestamps needs to
 * take this into account.  Here's a little macro to help out.  If no
 * wraparound has occurred, this is equivalent to
 *   time1 < time2
 * Of course, the rest of the ugliness of this macro comes from
 * accounting for the fact that wraparound can occur and the fact that
 * a timestamp of 0 must be special-cased since it means older than
 * anything else.
 *
 * Note that this is NOT an equivalent for time1 <= time2; if that's
 * what you need then you'll need to swap the order of the arguments
 * and negate the result.
 */
#define XSERVER_TIME_IS_BEFORE_ASSUMING_REAL_TIMESTAMPS(time1, time2) \
    ( (( (time1) < (time2) ) &&					      \
       ( (time2) - (time1) < ((unsigned long) -1) / 2 )) ||	      \
      (( (time1) > (time2) ) &&					      \
       ( (time1) - (time2) > ((unsigned long) -1) / 2 ))	      \
	)
#define XSERVER_TIME_IS_BEFORE(time1, time2)				 \
    ( (time1) == 0 ||							 \
      (XSERVER_TIME_IS_BEFORE_ASSUMING_REAL_TIMESTAMPS (time1, time2) && \
       (time2) != 0)							 \
	)

static Bool
getUsageTimestampForWindow (CompWindow *w,
			    Time       *timestamp)
{
    if (getWindowUserTime (w, timestamp))
	return TRUE;

    if (w->initialTimestampSet)
    {
	*timestamp = w->initialTimestamp;
	return TRUE;
    }

    return FALSE;
}

static Bool
getFocusWindowUsageTimestamp (CompWindow *w,
			      Time       *timestamp)
{
    if (getUsageTimestampForWindow (w, timestamp))
	return TRUE;

    /* if we got no timestamp for the window, try to get at least a timestamp
       for its transient parent, if any */
    if (w->transientFor)
    {
	CompWindow *parent;

	parent = findWindowAtScreen (w->screen, w->transientFor);
	if (parent && getUsageTimestampForWindow (parent, timestamp))
	    return TRUE;
    }

    return FALSE;
}

static Bool
isWindowFocusAllowed (CompWindow   *w,
		      unsigned int viewportX,
		      unsigned int viewportY,
		      Time         timestamp)
{
    CompDisplay  *d = w->screen->display;
    CompScreen   *s = w->screen;
    CompWindow   *active;
    Time	 aUserTime;
    CompMatch    *match;
    int          level, vx, vy;

    level = s->opt[COMP_SCREEN_OPTION_FOCUS_PREVENTION_LEVEL].value.i;

    if (level == FOCUS_PREVENTION_LEVEL_NONE)
	return TRUE;

    /* allow focus for excluded windows */
    match = &s->opt[COMP_SCREEN_OPTION_FOCUS_PREVENTION_MATCH].value.match;
    if (!matchEval (match, w))
	return TRUE;

    if (level == FOCUS_PREVENTION_LEVEL_VERYHIGH)
	return FALSE;

    active = findWindowAtDisplay (d, d->activeWindow);

    /* no active window */
    if (!active || (active->type & CompWindowTypeDesktopMask))
	return TRUE;

    /* active window belongs to same application */
    if (w->clientLeader == active->clientLeader)
	return TRUE;

    if (level == FOCUS_PREVENTION_LEVEL_HIGH)
	return FALSE;

    /* not in current viewport or desktop */
    if (!onCurrentDesktop (w))
	return FALSE;

    defaultViewportForWindow (w, &vx, &vy);
    if (vx != viewportX || vy != viewportY)
	return FALSE;

    if (!timestamp)
    {
	/* unsure as we have nothing to compare - allow focus in low level,
	   don't allow in normal level */
	if (level == FOCUS_PREVENTION_LEVEL_NORMAL)
	    return FALSE;

	return TRUE;
    }

    /* can't get user time for active window */
    if (!getWindowUserTime (active, &aUserTime))
	return TRUE;

    if (XSERVER_TIME_IS_BEFORE (timestamp, aUserTime))
	return FALSE;

    return TRUE;
}

CompFocusResult
allowWindowFocus (CompWindow   *w,
		  unsigned int noFocusMask,
		  unsigned int viewportX,
		  unsigned int viewportY,
		  Time         timestamp)
{
    Bool status;

    if (w->id == w->screen->display->activeWindow)
	return CompFocusAllowed;

    /* do not focus windows of these types */
    if (w->type & noFocusMask)
	return CompFocusPrevent;

    /* window doesn't take focus */
    if (!w->inputHint && !(w->protocols & CompWindowProtocolTakeFocusMask))
	return CompFocusPrevent;

    if (!timestamp)
    {
	/* if the window has a 0 timestamp, it explicitly requested no focus */
	if (getFocusWindowUsageTimestamp (w, &timestamp) && !timestamp)
	    return CompFocusPrevent;
    }

    status = isWindowFocusAllowed (w, viewportX, viewportY, timestamp);
    if (!status)
    {
	/* add demands attention state if focus was prevented */
	changeWindowState (w, w->state | CompWindowStateDemandsAttentionMask);
	return CompFocusDenied;
    }

    return CompFocusAllowed;
}

void
unredirectWindow (CompWindow *w)
{
    if (!w->redirected)
	return;

    releaseWindow (w);

    XCompositeUnredirectWindow (w->screen->display->display, w->id,
				CompositeRedirectManual);

    w->redirected   = FALSE;
    w->overlayWindow = TRUE;
    w->screen->overlayWindowCount++;

    if (w->screen->overlayWindowCount > 0)
	updateOutputWindow (w->screen);
}

void
redirectWindow (CompWindow *w)
{
    if (w->redirected)
	return;

    XCompositeRedirectWindow (w->screen->display->display, w->id,
			      CompositeRedirectManual);

    w->redirected = TRUE;

    if (w->overlayWindow)
    {
	w->screen->overlayWindowCount--;
	w->overlayWindow = FALSE;
    }

    if (w->screen->overlayWindowCount < 1)
	showOutputWindow (w->screen);
    else
	updateOutputWindow (w->screen);
}

void
defaultViewportForWindow (CompWindow *w,
			  int	     *vx,
			  int	     *vy)
{
    CompScreen *s = w->screen;

    /* return the current viewport if a part of the window is
       visible on it */
    if ((w->serverX < s->width  && w->serverX + w->serverWidth  > 0) &&
	(w->serverY < s->height && w->serverY + w->serverHeight > 0))
    {
	if (vx)
	    *vx = s->x;

	if (vy)
	    *vy = s->y;

	return;
    }

    viewportForGeometry (s,
			 w->serverX, w->serverY,
			 w->serverWidth, w->serverHeight,
			 w->serverBorderWidth,
			 vx, vy);
}

static CARD32 *
allocateWindowIcon (CompWindow   *w,
		    unsigned int width,
		    unsigned int height)
{
    CompIcon *icon, **pIcon;

    icon = malloc (sizeof (CompIcon) +
		   width * height * sizeof (CARD32));
    if (!icon)
	return NULL;

    pIcon = realloc (w->icon, sizeof (CompIcon *) * (w->nIcon + 1));
    if (!pIcon)
    {
	free (icon);
	return NULL;
    }

    w->icon = pIcon;
    w->icon[w->nIcon] = icon;
    w->nIcon++;

    icon->width  = width;
    icon->height = height;

    initTexture (w->screen, &icon->texture);

    return (CARD32 *) (icon + 1);
}

static void
readWindowIconHint (CompWindow *w)
{
    XImage       *image, *maskImage = NULL;
    Display      *dpy = w->screen->display->display;
    unsigned int width, height, dummy;
    int          i, j, k, iDummy;
    Window       wDummy;
    CARD32       *p;
    XColor       *colors;

    if (!XGetGeometry (dpy, w->hints->icon_pixmap, &wDummy, &iDummy,
		       &iDummy, &width, &height, &dummy, &dummy))
	return;

    image = XGetImage (dpy, w->hints->icon_pixmap, 0, 0, width, height,
		       AllPlanes, ZPixmap);
    if (!image)
	return;

    colors = malloc (width * height * sizeof (XColor));
    if (!colors)
    {
	XDestroyImage (image);
	return;
    }

    k = 0;
    for (j = 0; j < height; j++)
	for (i = 0; i < width; i++)
	    colors[k++].pixel = XGetPixel (image, i, j);

    for (i = 0; i < k; i += 256)
	XQueryColors (dpy, w->screen->colormap,
		      &colors[i], MIN (k - i, 256));

    XDestroyImage (image);

    p = allocateWindowIcon (w, width, height);
    if (!p)
    {
	free (colors);
	return;
    }

    if (w->hints->flags & IconMaskHint)
	maskImage = XGetImage (dpy, w->hints->icon_mask, 0, 0,
			       width, height, AllPlanes, ZPixmap);

    k = 0;
    for (j = 0; j < height; j++)
    {
	for (i = 0; i < width; i++)
	{
	    if (maskImage && !XGetPixel (maskImage, i, j))
		*p++ = 0;
	    else if (image->depth == 1)
		*p++ = colors[k].pixel ? 0xffffffff : 0xff000000;
	    else
		*p++ = 0xff000000                             | /* alpha */
		       (((colors[k].red >> 8) & 0xff) << 16)  | /* red */
		       (((colors[k].green >> 8) & 0xff) << 8) | /* green */
		       ((colors[k].blue >> 8) & 0xff);          /* blue */

	    k++;
	}
    }

    free (colors);
    if (maskImage)
	XDestroyImage (maskImage);
}

/* returns icon with dimensions as close as possible to width and height
   but never greater. */
CompIcon *
getWindowIcon (CompWindow *w,
	       int	  width,
	       int	  height)
{
    CompIcon *icon;
    int	     i, wh, diff, oldDiff;

    /* need to fetch icon property */
    if (w->nIcon == 0)
    {
	Atom	      actual;
	int	      result, format;
	unsigned long n, left;
	unsigned char *data;

	result = XGetWindowProperty (w->screen->display->display, w->id,
				     w->screen->display->wmIconAtom,
				     0L, 65536L,
				     FALSE, XA_CARDINAL,
				     &actual, &format, &n,
				     &left, &data);

	if (result == Success && data)
	{
	    CARD32        *p;
	    CARD32        alpha, red, green, blue;
	    unsigned long iw, ih;

	    for (i = 0; i + 2 < n; i += iw * ih + 2)
	    {
		unsigned long *idata = (unsigned long *) data;
		unsigned long j;

		iw = idata[i];
		ih = idata[i + 1];

		/* iw * ih may be larger than the value range of unsigned
		   long, so better do some checking for extremely weird
		   icon sizes first */
		if (iw > 2048 || ih > 2048 || iw * ih + 2 > n - i)
		    break;

		if (iw && ih)
		{
		    p = allocateWindowIcon (w, iw, ih);
		    if (!p)
			continue;

		    /* EWMH doesn't say if icon data is premultiplied or
		       not but most applications seem to assume data should
		       be unpremultiplied. */
		    for (j = 0; j < iw * ih; j++)
		    {
			alpha = (idata[i + j + 2] >> 24) & 0xff;
			red   = (idata[i + j + 2] >> 16) & 0xff;
			green = (idata[i + j + 2] >>  8) & 0xff;
			blue  = (idata[i + j + 2] >>  0) & 0xff;

			red   = (red   * alpha) >> 8;
			green = (green * alpha) >> 8;
			blue  = (blue  * alpha) >> 8;

			p[j] =
			    (alpha << 24) |
			    (red   << 16) |
			    (green <<  8) |
			    (blue  <<  0);
		    }
		}
	    }

	    XFree (data);
	}
	else if (w->hints && (w->hints->flags & IconPixmapHint))
	    readWindowIconHint (w);

	/* don't fetch property again */
	if (w->nIcon == 0)
	    w->nIcon = -1;
    }

    /* no icons available for this window */
    if (w->nIcon == -1)
	return NULL;

    icon = NULL;
    wh   = width + height;

    for (i = 0; i < w->nIcon; i++)
    {
	if (w->icon[i]->width > width || w->icon[i]->height > height)
	    continue;

	if (icon)
	{
	    diff    = wh - (w->icon[i]->width + w->icon[i]->height);
	    oldDiff = wh - (icon->width + icon->height);

	    if (diff < oldDiff)
		icon = w->icon[i];
	}
	else
	    icon = w->icon[i];
    }

    return icon;
}

void
freeWindowIcons (CompWindow *w)
{
    int i;

    for (i = 0; i < w->nIcon; i++)
    {
	finiTexture (w->screen, &w->icon[i]->texture);
	free (w->icon[i]);
    }

    if (w->icon)
    {
	free (w->icon);
	w->icon = NULL;
    }

    w->nIcon = 0;
}

int
outputDeviceForWindow (CompWindow *w)
{
    return outputDeviceForGeometry (w->screen,
				    w->serverX, w->serverY,
				    w->serverWidth, w->serverHeight,
				    w->serverBorderWidth);
}

Bool
onCurrentDesktop (CompWindow *w)
{
    if (w->desktop == 0xffffffff || w->desktop == w->screen->currentDesktop)
	return TRUE;

    return FALSE;
}

void
setDesktopForWindow (CompWindow   *w,
		     unsigned int desktop)
{
    if (desktop != 0xffffffff)
    {
	if (w->type & (CompWindowTypeDesktopMask | CompWindowTypeDockMask))
	    return;

	if (desktop >= w->screen->nDesktop)
	    return;
    }

    if (desktop == w->desktop)
	return;

    w->desktop = desktop;

    if (desktop == 0xffffffff || desktop == w->screen->currentDesktop)
	showWindow (w);
    else
	hideWindow (w);

    setWindowProp (w->screen->display, w->id,
		   w->screen->display->winDesktopAtom,
		   w->desktop);
}

/* The compareWindowActiveness function compares the two windows 'w1'
   and 'w2'. It returns an integer less than, equal to, or greater
   than zero if 'w1' is found, respectively, to activated longer time
   ago than, to be activated at the same time, or be activated more
   recently than 'w2'. */
int
compareWindowActiveness (CompWindow *w1,
			 CompWindow *w2)
{
    CompScreen		    *s = w1->screen;
    CompActiveWindowHistory *history = &s->history[s->currentHistory];
    int			    i;

    /* check current window history first */
    for (i = 0; i < ACTIVE_WINDOW_HISTORY_SIZE; i++)
    {
	if (history->id[i] == w1->id)
	    return 1;

	if (history->id[i] == w2->id)
	    return -1;

	if (!history->id[i])
	    break;
    }

    return w1->activeNum - w2->activeNum;
}

Bool
windowOnAllViewports (CompWindow *w)
{
    if (w->attrib.override_redirect)
	return TRUE;

    if (!w->managed && w->attrib.map_state != IsViewable)
	return TRUE;

    if (w->type & (CompWindowTypeDesktopMask | CompWindowTypeDockMask))
	return TRUE;

    if (w->state & CompWindowStateStickyMask)
	return TRUE;

    return FALSE;
}

void
getWindowMovementForOffset (CompWindow *w,
			    int        offX,
			    int        offY,
			    int        *retX,
			    int        *retY)
{
    CompScreen *s = w->screen;
    int         m, vWidth, vHeight;

    vWidth = s->width * s->hsize;
    vHeight = s->height * s->vsize;

    offX %= s->width * s->hsize;
    offY %= s->height * s->vsize;

    /* x */
    if (s->hsize == 1)
    {
	(*retX) = offX;
    }
    else
    {
	m = w->attrib.x + offX;
	if (m - w->input.left < s->width - vWidth)
	    *retX = offX + vWidth;
	else if (m + w->width + w->input.right > vWidth)
	    *retX = offX - vWidth;
	else
	    *retX = offX;
    }

    if (s->vsize == 1)
    {
	*retY = offY;
    }
    else
    {
	m = w->attrib.y + offY;
	if (m - w->input.top < s->height - vHeight)
	    *retY = offY + vHeight;
	else if (m + w->height + w->input.bottom > vHeight)
	    *retY = offY - vHeight;
	else
	    *retY = offY;
    }

}