xserver/hw/dmx/dmxscrinit.c

/*
 * Copyright 2001-2004 Red Hat Inc., Durham, North Carolina.
 *
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation on the rights to use, copy, modify, merge,
 * publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NON-INFRINGEMENT.  IN NO EVENT SHALL RED HAT AND/OR THEIR SUPPLIERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

/*
 * Authors:
 *   Kevin E. Martin <kem@redhat.com>
 *   David H. Dawes <dawes@xfree86.org>
 *
 */

/** \file
 * This file provides support for screen initialization. */

#ifdef HAVE_DMX_CONFIG_H
#include <dmx-config.h>
#endif

#include "dmx.h"
#include "dmxextension.h"
#include "dmxsync.h"
#include "dmxshadow.h"
#include "dmxscrinit.h"
#include "dmxcursor.h"
#include "dmxgc.h"
#include "dmxgcops.h"
#include "dmxwindow.h"
#include "dmxpixmap.h"
#include "dmxfont.h"
#include "dmxcmap.h"
#include "dmxprop.h"
#include "dmxdpms.h"
#include "dmxlog.h"
#include "dmxcb.h"
#include "dmxinit.h"

#ifdef PANORAMIX
#include "panoramiX.h"
#include "panoramiXsrv.h"
#endif

#ifdef RENDER
#include "dmxpict.h"
#endif

#ifdef RANDR
#include "dmxrandr.h"
#endif

#ifdef XV
#include "dmxxv.h"
#endif

#include "fb.h"
#include "mipointer.h"
#include "micmap.h"
#include "mivalidate.h"

#ifdef MITSHM
#include "shmint.h"
static void
dmxShmPutImage (DrawablePtr  dst,
		GCPtr	     pGC,
		int	     depth,
		unsigned int format,
		int	     w,
		int	     h,
		int	     sx,
		int	     sy,
		int	     sw,
		int	     sh,
		int	     dx,
		int	     dy,
		char	     *data)
{
    PixmapPtr pmap;
    GCPtr putGC;

    putGC = GetScratchGC(depth, dst->pScreen);
    if (!putGC)
	return;
    pmap = (*dst->pScreen->CreatePixmap)(dst->pScreen, sw, sh, depth,
					 CREATE_PIXMAP_USAGE_SCRATCH);
    if (!pmap)
    {
	FreeScratchGC(putGC);
	return;
    }
    ValidateGC((DrawablePtr)pmap, putGC);
    (*putGC->ops->PutImage)((DrawablePtr)pmap, putGC, depth, -sx, -sy, w, h, 0,
			    (format == XYPixmap) ? XYPixmap : ZPixmap, data);
    FreeScratchGC(putGC);
    if (format == XYBitmap)
	(void)(*pGC->ops->CopyPlane)((DrawablePtr)pmap, dst, pGC, 0, 0, sw, sh,
				     dx, dy, 1L);
    else
	(void)(*pGC->ops->CopyArea)((DrawablePtr)pmap, dst, pGC, 0, 0, sw, sh,
				    dx, dy);
    (*pmap->drawable.pScreen->DestroyPixmap)(pmap);
}
static ShmFuncs shmFuncs = { NULL, dmxShmPutImage };
#endif

extern Bool dmxCloseScreen(int idx, ScreenPtr pScreen);
static Bool dmxSaveScreen(ScreenPtr pScreen, int what);

static unsigned long dmxGeneration;
static unsigned long *dmxCursorGeneration;

static int dmxGCPrivateKeyIndex;
DevPrivateKey dmxGCPrivateKey = &dmxGCPrivateKey; /**< Private index for GCs       */
static int dmxWinPrivateKeyIndex;
DevPrivateKey dmxWinPrivateKey = &dmxWinPrivateKeyIndex; /**< Private index for Windows   */
static int dmxPixPrivateKeyIndex;
DevPrivateKey dmxPixPrivateKey = &dmxPixPrivateKeyIndex; /**< Private index for Pixmaps   */
int dmxFontPrivateIndex;        /**< Private index for Fonts     */
static int dmxScreenPrivateKeyIndex;
DevPrivateKey dmxScreenPrivateKey = &dmxScreenPrivateKeyIndex; /**< Private index for Screens   */
static int dmxColormapPrivateKeyIndex;
DevPrivateKey dmxColormapPrivateKey = &dmxColormapPrivateKeyIndex; /**< Private index for Colormaps */
#ifdef RENDER
static int dmxPictPrivateKeyIndex;
DevPrivateKey dmxPictPrivateKey = &dmxPictPrivateKeyIndex; /**< Private index for Picts     */
static int dmxGlyphSetPrivateKeyIndex;
DevPrivateKey dmxGlyphSetPrivateKey = &dmxGlyphSetPrivateKeyIndex; /**< Private index for GlyphSets */
static int dmxGlyphPrivateKeyIndex;
DevPrivateKey dmxGlyphPrivateKey = &dmxGlyphPrivateKeyIndex; /**< Private index for Glyphs */
#endif

/** Initialize the parts of screen \a idx that require access to the
 *  back-end server. */
void dmxBEScreenInit(int idx, ScreenPtr pScreen)
{
    DMXScreenInfo        *dmxScreen = &dmxScreens[idx];
    XSetWindowAttributes  attribs;
    XGCValues             gcvals;
    unsigned long         mask;
    int                   i, j;

    /* FIXME: The dmxScreenInit() code currently assumes that it will
     * not be called if the Xdmx server is started with this screen
     * detached -- i.e., it assumes that dmxScreen->beDisplay is always
     * valid.  This is not necessarily a valid assumption when full
     * addition/removal of screens is implemented, but when this code is
     * broken out for screen reattachment, then we will reevaluate this
     * assumption.
     */

    pScreen->mmWidth = DisplayWidthMM(dmxScreen->beDisplay, 
				      DefaultScreen(dmxScreen->beDisplay));
    pScreen->mmHeight = DisplayHeightMM(dmxScreen->beDisplay, 
					DefaultScreen(dmxScreen->beDisplay));

    pScreen->whitePixel = dmxScreen->beWhitePixel;
    pScreen->blackPixel = dmxScreen->beBlackPixel;

    /* Handle screen savers and DPMS on the backend */
    dmxDPMSInit(dmxScreen);

    /* Create root window for screen */
    mask = CWBackPixel | CWEventMask | CWColormap | CWOverrideRedirect;
    attribs.background_pixel = dmxScreen->beBlackPixel;
    attribs.event_mask = StructureNotifyMask | SubstructureRedirectMask;
    attribs.colormap = dmxScreen->beDefColormaps[dmxScreen->beDefVisualIndex];
    attribs.override_redirect = True;

    if (!dmxScreen->beUseRoot)
    {
	dmxScreen->scrnWin =
	    XCreateWindow(dmxScreen->beDisplay,
			  DefaultRootWindow(dmxScreen->beDisplay),
			  dmxScreen->scrnX,
			  dmxScreen->scrnY,
			  dmxScreen->scrnWidth,
			  dmxScreen->scrnHeight,
			  0,
			  pScreen->rootDepth,
			  InputOutput,
			  dmxScreen->beVisuals[dmxScreen->beDefVisualIndex].visual,
			  mask,
			  &attribs);
    }
    else
    {
	dmxScreen->scrnWin = DefaultRootWindow (dmxScreen->beDisplay);
	XSetWindowBackground (dmxScreen->beDisplay, dmxScreen->scrnWin,
			      attribs.background_pixel);
	XSelectInput (dmxScreen->beDisplay, dmxScreen->scrnWin,
		      attribs.event_mask);
    }
    dmxPropertyWindow(dmxScreen);

    /*
     * This turns off the cursor by defining a cursor with no visible
     * components.
     */
    if (1) {
	char noCursorData[] = {0, 0, 0, 0,
			       0, 0, 0, 0};
	Pixmap pixmap;
	XColor color, tmp;

	pixmap = XCreateBitmapFromData(dmxScreen->beDisplay, dmxScreen->scrnWin,
				       noCursorData, 8, 8);
	XAllocNamedColor(dmxScreen->beDisplay, dmxScreen->beDefColormaps[0],
			 "black", &color, &tmp);
	dmxScreen->noCursor = XCreatePixmapCursor(dmxScreen->beDisplay,
						  pixmap, pixmap,
						  &color, &color, 0, 0);
	XDefineCursor(dmxScreen->beDisplay, dmxScreen->scrnWin,
		      dmxScreen->noCursor);

	XFreePixmap(dmxScreen->beDisplay, pixmap);
    }

#ifdef RANDR
    dmxBERRScreenInit (pScreen);
#endif

#ifdef XV
    dmxBEXvScreenInit (pScreen);
#endif

    if (!dmxScreen->beUseRoot)
	XMapWindow (dmxScreen->beDisplay, dmxScreen->scrnWin);

    if (dmxShadowFB) {
	mask = (GCFunction
		| GCPlaneMask
		| GCClipMask);
	gcvals.function = GXcopy;
	gcvals.plane_mask = AllPlanes;
	gcvals.clip_mask = None;

	dmxScreen->shadowGC = XCreateGC(dmxScreen->beDisplay,
					dmxScreen->scrnWin,
					mask, &gcvals);

	dmxScreen->shadowFBImage =
	    XCreateImage(dmxScreen->beDisplay,
			 dmxScreen->beVisuals[dmxScreen->beDefVisualIndex].visual,
			 dmxScreen->beDepth,
			 ZPixmap,
			 0,
			 (char *)dmxScreen->shadow,
			 dmxScreen->scrnWidth, dmxScreen->scrnHeight,
			 dmxScreen->beBPP,
			 PixmapBytePad(dmxScreen->scrnWidth,
				       dmxScreen->beBPP));
    } else {
	/* Create default drawables (used during GC creation) */
	for (i = 0; i < dmxScreen->beNumPixmapFormats; i++) 
	    for (j = 0; j < dmxScreen->beNumDepths; j++)
		if ((dmxScreen->bePixmapFormats[i].depth == 1) ||
		    (dmxScreen->bePixmapFormats[i].depth ==
		     dmxScreen->beDepths[j])) {
		    dmxScreen->scrnDefDrawables[i] = (Drawable)
			XCreatePixmap(dmxScreen->beDisplay, dmxScreen->scrnWin,
				      1, 1, dmxScreen->bePixmapFormats[i].depth);
		    break;
		}
    }
}

static void
dmxSetWindowPixmap (WindowPtr pWin, PixmapPtr pPixmap)
{
    ScreenPtr       pScreen = pWin->drawable.pScreen;
    DMXScreenInfo  *dmxScreen = &dmxScreens[pScreen->myNum];
    PixmapPtr       pOld = (*pScreen->GetWindowPixmap) (pWin);

    if (pPixmap != pOld)
    {
	dmxWinPrivPtr pWinPriv = DMX_GET_WINDOW_PRIV (pWin);

	if (pPixmap && (*pScreen->GetWindowPixmap) (pWin->parent) != pPixmap)
	    pWinPriv->redirected = TRUE;
	else
	    pWinPriv->redirected = FALSE;
    }

    DMX_UNWRAP(SetWindowPixmap, dmxScreen, pScreen);
    if (pScreen->SetWindowPixmap)
	(*pScreen->SetWindowPixmap) (pWin, pPixmap);
    DMX_WRAP(SetWindowPixmap, dmxSetWindowPixmap, dmxScreen, pScreen);
}

static void
dmxScreenExpose (ScreenPtr pScreen)
{
    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];

    if (dmxScreen->beDisplay)
    {
	WindowPtr pChild0, pChildN;
	XEvent    X;

	for (;;)
	{
	    Bool status = FALSE;

	    XLIB_PROLOGUE (dmxScreen);

	    status = XCheckTypedEvent (dmxScreen->beDisplay, Expose, &X);

	    XLIB_EPILOGUE (dmxScreen);

	    if (!status)
		break;

	    if (dmxShouldIgnore (dmxScreen, X.xexpose.serial))
		continue;

	    pChild0 = WindowTable[0];
	    pChildN = WindowTable[pScreen->myNum];

	    for (;;)
	    {
		dmxWinPrivPtr pWinPriv = DMX_GET_WINDOW_PRIV (pChildN);

		if (pWinPriv->window == X.xexpose.window)
		    break;

		if (pChild0->firstChild)
		{
		    assert (pChildN->firstChild);
		    pChild0 = pChild0->firstChild;
		    pChildN = pChildN->firstChild;
		    continue;
		}

		while (!pChild0->nextSib && (pChild0 != WindowTable[0]))
		{
		    assert (!pChildN->nextSib &&
			    (pChildN != WindowTable[pScreen->myNum]));
		    pChild0 = pChild0->parent;
		    pChildN = pChildN->parent;
		}

		if (pChild0 == WindowTable[0])
		{
		    assert (pChildN == WindowTable[pScreen->myNum]);
		    break;
		}

		pChild0 = pChild0->nextSib;
		pChildN = pChildN->nextSib;
	    }

	    if (pChild0)
	    {
		RegionRec region;
		BoxRec    box;

		box.x1 = pChild0->drawable.x + X.xexpose.x;
		box.y1 = pChild0->drawable.y + X.xexpose.y;
		box.x2 = box.x1 + X.xexpose.width;
		box.y2 = box.y1 + X.xexpose.height;

		REGION_INIT (screenInfo.screens[0], &region, &box, 1);
		(*pScreen->WindowExposures) (pChild0, &region, NullRegion);
		REGION_UNINIT (screenInfo.screens[0], &region);
	    }
	}
    }
}

static Bool
dmxManagerPredicate (Display  *xdisplay,
		     XEvent   *X,
		     XPointer arg)
{
    Window *xWindow = (Window *) arg;

    switch (X->type) {
    case CirculateRequest:
	*xWindow = X->xcirculaterequest.window;
	break;
    case ConfigureRequest:
	*xWindow = X->xconfigurerequest.window;
	break;
    case MapRequest:
	*xWindow = X->xmaprequest.window;
	break;
    case ClientMessage:
	*xWindow = X->xclient.window;
	break;
    default:
	return FALSE;
    }

    return TRUE;
}

static void
dmxScreenManage (ScreenPtr pScreen)
{
    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];

    if (dmxScreen->beDisplay)
    {
	WindowPtr pChild;
	Window    xWindow;
	XEvent    X;

	for (;;)
	{
	    Bool         status = FALSE;

#ifdef PANORAMIX
	    PanoramiXRes *win = NULL;
	    WindowPtr    pWin;
#endif

	    XLIB_PROLOGUE (dmxScreen);
	    status = XCheckIfEvent (dmxScreen->beDisplay,
				    &X,
				    dmxManagerPredicate,
				    (XPointer) &xWindow);
	    XLIB_EPILOGUE (dmxScreen);

	    if (!status)
		break;

	    pChild = WindowTable[pScreen->myNum];

	    for (;;)
	    {
		dmxWinPrivPtr pWinPriv = DMX_GET_WINDOW_PRIV (pChild);

		if (pWinPriv->window == xWindow)
		{

#ifdef PANORAMIX
		    if (!noPanoramiXExtension)
			win = PanoramiXFindIDByScrnum (XRT_WINDOW,
						       pChild->drawable.id,
						       pScreen->myNum);
#endif

		    break;
		}

		if (pChild->firstChild)
		{
		    pChild = pChild->firstChild;
		    continue;
		}

		while (!pChild->nextSib &&
		       (pChild != WindowTable[pScreen->myNum]))
		    pChild = pChild->parent;

		if (pChild == WindowTable[pScreen->myNum])
		    break;

		pChild = pChild->nextSib;
	    }

	    if (pChild

#ifdef PANORAMIX
		&& win
#endif

		)
	    {
		XID    vlist[8];
		char   *name = NULL;
		Atom   type;
		int    mask, i = 0;
		int    status = Success;
		xEvent x;

		switch (X.type) {
		case CirculateRequest:
		    vlist[0] = None;

		    if (X.xcirculaterequest.place == PlaceOnTop)
			vlist[1] = Above;
		    else
			vlist[1] = Below;

#ifdef PANORAMIX
		    if (!noPanoramiXExtension)
		    {
			int j;

			FOR_NSCREENS_FORWARD(j) {
			    if (dixLookupWindow (&pWin,
						 win->info[j].id,
						 serverClient,
						 DixReadAccess) == Success)
				status |= ConfigureWindow (pWin,
							   CWSibling |
							   CWStackMode,
							   vlist,
							   serverClient);
			}
		    }
		    else
#endif
			status = ConfigureWindow (pChild,
						  CWSibling | CWStackMode,
						  vlist,
						  serverClient);
		    break;
		case ConfigureRequest:
		    mask = X.xconfigurerequest.value_mask;

		    if (mask & (CWX | CWY))
		    {
			vlist[i++] = X.xconfigurerequest.x;
			vlist[i++] = X.xconfigurerequest.y;
		    }

		    if (mask & (CWWidth | CWHeight))
		    {
			vlist[i++] = X.xconfigurerequest.width;
			vlist[i++] = X.xconfigurerequest.height;
		    }

		    if (mask & CWBorderWidth)
			vlist[i++] = X.xconfigurerequest.border_width;

		    if (mask & CWSibling)
		    {
			/* ignore stacking requests with sibling */
			if (X.xconfigurerequest.above == None)
			    vlist[i++] = None;
			else
			    mask &= ~(CWSibling | CWStackMode);
		    }

		    if (mask & CWStackMode)
			vlist[i++] = X.xconfigurerequest.detail;

#ifdef PANORAMIX
		    if (!noPanoramiXExtension)
		    {
			int j;

			FOR_NSCREENS_FORWARD(j) {
			    if (dixLookupWindow (&pWin,
						 win->info[j].id,
						 serverClient,
						 DixReadAccess) == Success)
				status |= ConfigureWindow (pWin,
							   mask,
							   vlist,
							   serverClient);
			}
		    }
		    else
#endif

			status = ConfigureWindow (pChild,
						  mask,
						  vlist,
						  serverClient);
		    break;
		case MapRequest:

#ifdef PANORAMIX
		    if (!noPanoramiXExtension)
		    {
			int j;

			FOR_NSCREENS_FORWARD(j) {
			    if (dixLookupWindow (&pWin,
						 win->info[j].id,
						 serverClient,
						 DixReadAccess) == Success)
				status |= MapWindow (pWin, serverClient);
			}
		    }
		    else
#endif

			status = MapWindow (pChild, serverClient);
		    break;
		case ClientMessage:
		    x.u.u.type               = ClientMessage | 0x80;
		    x.u.u.detail             = X.xclient.format;
		    x.u.clientMessage.window = pChild->drawable.id;

		    /* ROUNDTRIP: if name is not cached by xlib */
		    XLIB_PROLOGUE (dmxScreen);
		    name = XGetAtomName (dmxScreen->beDisplay,
					 X.xclient.message_type);
		    XLIB_EPILOGUE (dmxScreen);

		    if (!name)
			break;

		    type = MakeAtom (name, strlen (name), TRUE);

		    switch (X.xclient.format) {
		    case 8:
			x.u.clientMessage.u.b.type = type;

			for (i = 0; i < 20; i++)
			    x.u.clientMessage.u.b.bytes[i] =
				X.xclient.data.b[i];
			break;
		    case 16:
			x.u.clientMessage.u.s.type = type;

			x.u.clientMessage.u.s.shorts0 = X.xclient.data.s[0];
			x.u.clientMessage.u.s.shorts1 = X.xclient.data.s[1];
			x.u.clientMessage.u.s.shorts2 = X.xclient.data.s[2];
			x.u.clientMessage.u.s.shorts3 = X.xclient.data.s[3];
			x.u.clientMessage.u.s.shorts4 = X.xclient.data.s[4];
			x.u.clientMessage.u.s.shorts5 = X.xclient.data.s[5];
			x.u.clientMessage.u.s.shorts6 = X.xclient.data.s[6];
			x.u.clientMessage.u.s.shorts7 = X.xclient.data.s[7];
			x.u.clientMessage.u.s.shorts8 = X.xclient.data.s[8];
			x.u.clientMessage.u.s.shorts9 = X.xclient.data.s[9];
			break;
		    case 32:
			x.u.clientMessage.u.l.type = type;

			x.u.clientMessage.u.l.longs0 = X.xclient.data.l[0];
			x.u.clientMessage.u.l.longs1 = X.xclient.data.l[1];
			x.u.clientMessage.u.l.longs2 = X.xclient.data.l[2];
			x.u.clientMessage.u.l.longs3 = X.xclient.data.l[3];
			x.u.clientMessage.u.l.longs4 = X.xclient.data.l[4];
			break;
		    }

		    /* client messages are always forwarded to the root
		       window as there's no way for us to know which
		       windows they were originally intended for */
		    pWin = WindowTable[pScreen->myNum];

#ifdef PANORAMIX
		    if (!noPanoramiXExtension)
		    {
			x.u.clientMessage.window = win->info[0].id;
			pWin = WindowTable[0];
		    }
#endif

		    DeliverEventsToWindow (PickPointer (serverClient),
					   pWin,
					   &x,
					   1,
					   SubstructureRedirectMask |
					   SubstructureNotifyMask,
					   NullGrab, 0);
		    break;
		}

		if (status != Success)
		    dmxLog (dmxWarning,
			    "dmxScreenManage: failed to handle "
			    "request type %d\n",
			    X.type);
	    }
	    else
	    {
		XWindowChanges xwc;

		switch (X.type) {
		case CirculateRequest:
		    XLIB_PROLOGUE (dmxScreen);
		    if (X.xcirculaterequest.place == PlaceOnTop)
			XRaiseWindow (dmxScreen->beDisplay,
				      X.xcirculaterequest.window);
		    else
			XLowerWindow (dmxScreen->beDisplay,
				      X.xcirculaterequest.window);
		    XLIB_EPILOGUE (dmxScreen);
		    break;
		case ConfigureRequest:
		    xwc.x	     = X.xconfigurerequest.x;
		    xwc.y	     = X.xconfigurerequest.y;
		    xwc.width	     = X.xconfigurerequest.width;
		    xwc.height	     = X.xconfigurerequest.height;
		    xwc.border_width = X.xconfigurerequest.border_width;
		    xwc.sibling      = X.xconfigurerequest.above;
		    xwc.stack_mode   = X.xconfigurerequest.detail;

		    XLIB_PROLOGUE (dmxScreen);
		    XConfigureWindow (dmxScreen->beDisplay,
				      X.xconfigurerequest.window,
				      X.xconfigurerequest.value_mask,
				      &xwc);
		    XLIB_EPILOGUE (dmxScreen);
		    break;
		case MapRequest:
		    XLIB_PROLOGUE (dmxScreen);
		    XMapWindow (dmxScreen->beDisplay, X.xmaprequest.window);
		    XLIB_EPILOGUE (dmxScreen);
		    break;
		case ClientMessage:
		    break;
		}
	    }
	}
    }
}

static void
dmxScreenBlockHandler (pointer   blockData,
		       OSTimePtr pTimeout,
		       pointer   pReadMask)
{
    ScreenPtr pScreen = (ScreenPtr) blockData;

    dmxScreenExpose (pScreen);
}

static void
dmxScreenWakeupHandler (pointer blockData,
			int     result,
			pointer pReadMask)
{
    ScreenPtr pScreen = (ScreenPtr) blockData;

#ifdef RANDR
    dmxRRCheckScreen (pScreen);
#endif

    dmxScreenManage (pScreen);
}

static void
dmxHandleExposures (WindowPtr pWin)
{
    WindowPtr pChild;
    ValidatePtr val;
    ScreenPtr pScreen;
    WindowExposuresProcPtr WindowExposures;

    pScreen = pWin->drawable.pScreen;

    pChild = pWin;
    WindowExposures = pChild->drawable.pScreen->WindowExposures;
    while (1)
    {
	if ( (val = pChild->valdata) )
	{
	    REGION_UNINIT(pScreen, &val->after.borderExposed);
	    (*WindowExposures)(pChild, &val->after.exposed, NullRegion);
	    REGION_UNINIT(pScreen, &val->after.exposed);
	    xfree(val);
	    pChild->valdata = (ValidatePtr)NULL;
	    if (pChild->firstChild)
	    {
		pChild = pChild->firstChild;
		continue;
	    }
	}
	while (!pChild->nextSib && (pChild != pWin))
	    pChild = pChild->parent;
	if (pChild == pWin)
	    break;
	pChild = pChild->nextSib;
    }
}

/** Initialize screen number \a idx. */
Bool dmxScreenInit(int idx, ScreenPtr pScreen, int argc, char *argv[])
{
    DMXScreenInfo        *dmxScreen = &dmxScreens[idx];
    int                   i, j;

    if (dmxGeneration != serverGeneration) {
	/* Allocate font private index */
	dmxFontPrivateIndex = AllocateFontPrivateIndex();
	if (dmxFontPrivateIndex == -1)
	    return FALSE;

	dmxGeneration = serverGeneration;
    }

    dmxScreen->ignoreHead = NULL;
    dmxScreen->ignoreTail = &dmxScreen->ignoreHead;

#ifdef RANDR
    dmxScreen->beRandr = FALSE;
    dmxScreen->beRandrPending = FALSE;
#endif

    if (dmxShadowFB) {
	dmxScreen->shadow = shadowAlloc(dmxScreen->scrnWidth,
					dmxScreen->scrnHeight,
					dmxScreen->beBPP);
    } else {
	if (!dmxInitGC(pScreen)) return FALSE;
	if (!dmxInitWindow(pScreen)) return FALSE;
	if (!dmxInitPixmap(pScreen)) return FALSE;
	if (!dmxInitCursor(pScreen)) return FALSE;
    }

    /*
     * Initalise the visual types.  miSetVisualTypesAndMasks() requires
     * that all of the types for each depth be collected together.  It's
     * intended for slightly different usage to what we would like here.
     * Maybe a miAddVisualTypeAndMask() function will be added to make
     * things easier here.
     */
    if (dmxScreen->beDisplay)
    {
	for (i = 0; i < dmxScreen->beNumDepths; i++) {
	    int    depth;
	    int    visuals        = 0;
	    int    bitsPerRgb     = 0;
	    int    preferredClass = -1;
	    Pixel  redMask        = 0;
	    Pixel  greenMask      = 0;
	    Pixel  blueMask       = 0;

	    depth = dmxScreen->beDepths[i];
	    for (j = 0; j < dmxScreen->beNumVisuals; j++) {
		XVisualInfo *vi;

		vi = &dmxScreen->beVisuals[j];
		if (vi->depth == depth) {
		    /* Assume the masks are all the same. */
		    visuals |= (1 << vi->class);
		    bitsPerRgb = vi->bits_per_rgb;
		    redMask = vi->red_mask;
		    greenMask = vi->green_mask;
		    blueMask = vi->blue_mask;
		    if (j == dmxScreen->beDefVisualIndex) {
			preferredClass = vi->class;
		    }
		}
	    }

#ifdef PANORAMIX
	    if (!noPanoramiXExtension)
	    {
		/* avoid additional DirectColor visuals for better
		   back-end server support */
		if (preferredClass != DirectColor)
		    visuals &= ~(1 << DirectColor);
	    }
#endif

	    miSetVisualTypesAndMasks(depth, visuals, bitsPerRgb,
				     preferredClass,
				     redMask, greenMask, blueMask);
	}
    }
    else
    {
	for (i = 0; i < dmxScreens[0].beNumDepths; i++) {
	    int    depth;
	    int    visuals        = 0;
	    int    bitsPerRgb     = 0;
	    int    preferredClass = -1;
	    Pixel  redMask        = 0;
	    Pixel  greenMask      = 0;
	    Pixel  blueMask       = 0;

	    depth = dmxScreens[0].beDepths[i];
	    for (j = 0; j < dmxScreens[0].beNumVisuals; j++) {
		XVisualInfo *vi;

		vi = &dmxScreens[0].beVisuals[j];
		if (vi->depth == depth) {
		    /* Assume the masks are all the same. */
		    visuals |= (1 << vi->class);
		    bitsPerRgb = vi->bits_per_rgb;
		    redMask = vi->red_mask;
		    greenMask = vi->green_mask;
		    blueMask = vi->blue_mask;
		    if (j == dmxScreens[0].beDefVisualIndex) {
			preferredClass = vi->class;
		    }
		}
	    }

#ifdef PANORAMIX
	    if (!noPanoramiXExtension)
	    {
		/* avoid additional DirectColor visuals for better
		   back-end server support */
		if (preferredClass != DirectColor)
		    visuals &= ~(1 << DirectColor);
	    }
#endif

	    miSetVisualTypesAndMasks(depth, visuals, bitsPerRgb,
				     preferredClass,
				     redMask, greenMask, blueMask);
	}
    }

    fbScreenInit(pScreen,
		 dmxShadowFB ? dmxScreen->shadow : NULL,
		 dmxScreen->scrnWidth,
		 dmxScreen->scrnHeight,
		 dmxScreen->beXDPI,
		 dmxScreen->beYDPI,
		 dmxScreen->scrnWidth,
		 dmxScreen->beBPP);

#ifdef MITSHM
    ShmRegisterFuncs (pScreen, &shmFuncs);
#endif

#ifdef PANORAMIX
    if (!noPanoramiXExtension)
    {
	for (i = 0; i < pScreen->numVisuals; i++)
	    if (pScreen->visuals[i].ColormapEntries > 256)
		pScreen->visuals[i].ColormapEntries = 256;
    }
#endif

#ifdef RENDER
    (void)dmxPictureInit(pScreen, 0, 0);
#endif

#ifdef RANDR
    if (dmxScreen->beDisplay)
    {
	int major, minor, status = 0;

	XLIB_PROLOGUE (dmxScreen);
	status = XRRQueryVersion (dmxScreen->beDisplay, &major, &minor);
	XLIB_EPILOGUE (dmxScreen);

	if (status)
	{
	    if (major > 1 || (major == 1 && minor >= 2))
	    {
		int ignore;

		XLIB_PROLOGUE (dmxScreen);
		dmxScreen->beRandr =
		    XRRQueryExtension (dmxScreen->beDisplay,
				       &dmxScreen->beRandrEventBase,
				       &ignore);
		XLIB_EPILOGUE (dmxScreen);
	    }
	}
    }

    if (!dmxRRScreenInit (pScreen))
	return FALSE;
#endif

#ifdef XV
    if (!dmxXvScreenInit (pScreen))
	return FALSE;
#endif

    if (dmxShadowFB && !shadowInit(pScreen, dmxShadowUpdateProc, NULL))
	return FALSE;

    miInitializeBackingStore(pScreen);

    if (dmxShadowFB) {
	miDCInitialize(pScreen, &dmxPointerCursorFuncs);
    } else {
        MAXSCREENSALLOC(dmxCursorGeneration);
	if (dmxCursorGeneration[idx] != serverGeneration) {
	    if (!(miPointerInitialize(pScreen,
				      &dmxPointerSpriteFuncs,
				      &dmxPointerCursorFuncs,
				      FALSE)))
		return FALSE;

	    dmxCursorGeneration[idx] = serverGeneration;
	}
    }

    DMX_WRAP(CloseScreen, dmxCloseScreen, dmxScreen, pScreen);
    DMX_WRAP(SaveScreen, dmxSaveScreen, dmxScreen, pScreen);

    if (dmxScreen->beDisplay)
	dmxBEScreenInit(idx, pScreen);

    if (!dmxShadowFB) {
	/* Wrap GC functions */
	DMX_WRAP(CreateGC, dmxCreateGC, dmxScreen, pScreen);

	/* Wrap Window functions */
	DMX_WRAP(CreateWindow, dmxCreateWindow, dmxScreen, pScreen);
	DMX_WRAP(DestroyWindow, dmxDestroyWindow, dmxScreen, pScreen);
	DMX_WRAP(PositionWindow, dmxPositionWindow, dmxScreen, pScreen);
	DMX_WRAP(ChangeWindowAttributes, dmxChangeWindowAttributes, dmxScreen,
		 pScreen);
	DMX_WRAP(RealizeWindow, dmxRealizeWindow, dmxScreen, pScreen);
	DMX_WRAP(UnrealizeWindow, dmxUnrealizeWindow, dmxScreen, pScreen);
	DMX_WRAP(RestackWindow, dmxRestackWindow, dmxScreen, pScreen);
	DMX_WRAP(CopyWindow, dmxCopyWindow, dmxScreen, pScreen);

	DMX_WRAP(ResizeWindow, dmxResizeWindow, dmxScreen, pScreen);
	DMX_WRAP(HandleExposures, dmxHandleExposures, dmxScreen, pScreen);
	DMX_WRAP(ReparentWindow, dmxReparentWindow, dmxScreen, pScreen);

	DMX_WRAP(ChangeBorderWidth, dmxChangeBorderWidth, dmxScreen, pScreen);

	DMX_WRAP(ModifyPixmapHeader, dmxModifyPixmapHeader, dmxScreen, pScreen);

	DMX_WRAP(SetWindowPixmap, dmxSetWindowPixmap, dmxScreen, pScreen);

	/* Wrap Image functions */
	DMX_WRAP(GetImage, dmxGetImage, dmxScreen, pScreen);
	DMX_WRAP(GetSpans, NULL, dmxScreen, pScreen);

	/* Wrap Pixmap functions */
	DMX_WRAP(CreatePixmap, dmxCreatePixmap, dmxScreen, pScreen);
	DMX_WRAP(DestroyPixmap, dmxDestroyPixmap, dmxScreen, pScreen);
	DMX_WRAP(BitmapToRegion, dmxBitmapToRegion, dmxScreen, pScreen);

	/* Wrap Font functions */
	DMX_WRAP(RealizeFont, dmxRealizeFont, dmxScreen, pScreen);
	DMX_WRAP(UnrealizeFont, dmxUnrealizeFont, dmxScreen, pScreen);

	/* Wrap Colormap functions */
	DMX_WRAP(CreateColormap, dmxCreateColormap, dmxScreen, pScreen);
	DMX_WRAP(DestroyColormap, dmxDestroyColormap, dmxScreen, pScreen);
	DMX_WRAP(InstallColormap, dmxInstallColormap, dmxScreen, pScreen);
	DMX_WRAP(StoreColors, dmxStoreColors, dmxScreen, pScreen);

	/* Wrap Shape functions */
	DMX_WRAP(SetShape, dmxSetShape, dmxScreen, pScreen);
    }

    if (!dmxCreateDefColormap(pScreen))
	return FALSE;

    RegisterBlockAndWakeupHandlers (dmxScreenBlockHandler,
				    dmxScreenWakeupHandler,
				    pScreen);

    return TRUE;
}

/** Close the \a pScreen resources on the back-end server. */
void dmxBECloseScreen(ScreenPtr pScreen)
{
    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
    int            i;

    /* Restore the back-end screen-saver and DPMS state. */
    dmxDPMSTerm(dmxScreen);

    /* Free the screen resources */

    XLIB_PROLOGUE (dmxScreen);
    XFreeCursor(dmxScreen->beDisplay, dmxScreen->noCursor);
    XLIB_EPILOGUE (dmxScreen);
    dmxScreen->noCursor = (Cursor)0;

    if (!dmxScreen->beUseRoot)
    {
	XLIB_PROLOGUE (dmxScreen);
	XUnmapWindow(dmxScreen->beDisplay, dmxScreen->scrnWin);
	XDestroyWindow(dmxScreen->beDisplay, dmxScreen->scrnWin);
	XLIB_EPILOGUE (dmxScreen);
    }
    dmxScreen->scrnWin = (Window)0;

    if (dmxShadowFB) {
	/* Free the shadow GC and image assocated with the back-end server */
	XLIB_PROLOGUE (dmxScreen);
	XFreeGC(dmxScreen->beDisplay, dmxScreen->shadowGC);
	XLIB_EPILOGUE (dmxScreen);
	dmxScreen->shadowGC = NULL;
	XFree(dmxScreen->shadowFBImage);
	dmxScreen->shadowFBImage = NULL;
    } else {
	/* Free the default drawables */
	for (i = 0; i < dmxScreen->beNumPixmapFormats; i++) {
	    XLIB_PROLOGUE (dmxScreen);
	    XFreePixmap(dmxScreen->beDisplay, dmxScreen->scrnDefDrawables[i]);
	    XLIB_EPILOGUE (dmxScreen);
	    dmxScreen->scrnDefDrawables[i] = (Drawable)0;
	}
    }

    /* Free resources allocated during initialization (in dmxinit.c) */
    for (i = 0; i < dmxScreen->beNumDefColormaps; i++)
    {
	XLIB_PROLOGUE (dmxScreen);
	XFreeColormap(dmxScreen->beDisplay, dmxScreen->beDefColormaps[i]);
	XLIB_EPILOGUE (dmxScreen);
    }
    xfree(dmxScreen->beDefColormaps);
    dmxScreen->beDefColormaps = NULL;

#if 0
    /* Do not free visuals, depths and pixmap formats here.  Free them
     * in dmxCloseScreen() instead -- see comment below. */
    XFree(dmxScreen->beVisuals);
    dmxScreen->beVisuals = NULL;

    XFree(dmxScreen->beDepths);
    dmxScreen->beDepths = NULL;

    XFree(dmxScreen->bePixmapFormats);
    dmxScreen->bePixmapFormats = NULL;
#endif

#ifdef GLXEXT
    if (dmxScreen->glxVisuals) {
	XFree(dmxScreen->glxVisuals);
	dmxScreen->glxVisuals = NULL;
	dmxScreen->numGlxVisuals = 0;
    }
#endif

    /* Close display */
    dmxCloseDisplay (dmxScreen);
    dmxScreen->beDisplay = NULL;
}

/** Close screen number \a idx. */
Bool dmxCloseScreen(int idx, ScreenPtr pScreen)
{
    DMXScreenInfo *dmxScreen = &dmxScreens[idx];

    /* Reset the proc vectors */
    if (idx == 0) {
#ifdef RENDER
	dmxResetRender();
#endif
	dmxResetFonts();
    }

    if (dmxShadowFB) {
	/* Free the shadow framebuffer */
	xfree(dmxScreen->shadow);
    } else {

	/* Unwrap Shape functions */
	DMX_UNWRAP(SetShape, dmxScreen, pScreen);

	/* Unwrap the pScreen functions */
	DMX_UNWRAP(CreateGC, dmxScreen, pScreen);

	DMX_UNWRAP(CreateWindow, dmxScreen, pScreen);
	DMX_UNWRAP(DestroyWindow, dmxScreen, pScreen);
	DMX_UNWRAP(PositionWindow, dmxScreen, pScreen);
	DMX_UNWRAP(ChangeWindowAttributes, dmxScreen, pScreen);
	DMX_UNWRAP(RealizeWindow, dmxScreen, pScreen);
	DMX_UNWRAP(UnrealizeWindow, dmxScreen, pScreen);
	DMX_UNWRAP(RestackWindow, dmxScreen, pScreen);
	DMX_UNWRAP(CopyWindow, dmxScreen, pScreen);

	DMX_UNWRAP(ResizeWindow, dmxScreen, pScreen);
	DMX_UNWRAP(HandleExposures, dmxScreen, pScreen);
	DMX_UNWRAP(ReparentWindow, dmxScreen, pScreen);

	DMX_UNWRAP(ChangeBorderWidth, dmxScreen, pScreen);

	DMX_UNWRAP(ModifyPixmapHeader, dmxScreen, pScreen);

	DMX_UNWRAP(SetWindowPixmap, dmxScreen, pScreen);

	DMX_UNWRAP(GetImage, dmxScreen, pScreen);
	DMX_UNWRAP(GetSpans, dmxScreen, pScreen);

	DMX_UNWRAP(CreatePixmap, dmxScreen, pScreen);
	DMX_UNWRAP(DestroyPixmap, dmxScreen, pScreen);
	DMX_UNWRAP(BitmapToRegion, dmxScreen, pScreen);

	DMX_UNWRAP(RealizeFont, dmxScreen, pScreen);
	DMX_UNWRAP(UnrealizeFont, dmxScreen, pScreen);

	DMX_UNWRAP(CreateColormap, dmxScreen, pScreen);
	DMX_UNWRAP(DestroyColormap, dmxScreen, pScreen);
	DMX_UNWRAP(InstallColormap, dmxScreen, pScreen);
	DMX_UNWRAP(StoreColors, dmxScreen, pScreen);
    }

    DMX_UNWRAP(SaveScreen, dmxScreen, pScreen);

    if (dmxScreen->beDisplay) {
	dmxBECloseScreen(pScreen);

#if 1
	/* Free visuals, depths and pixmap formats here so that they
	 * won't be freed when a screen is detached, thereby allowing
	 * the screen to be reattached to be compared to the one
	 * previously removed.
	 */
	XFree(dmxScreen->beVisuals);
	dmxScreen->beVisuals = NULL;

	XFree(dmxScreen->beDepths);
	dmxScreen->beDepths = NULL;

	XFree(dmxScreen->bePixmapFormats);
	dmxScreen->bePixmapFormats = NULL;
#endif
    }

    DMX_UNWRAP(CloseScreen, dmxScreen, pScreen);
    return pScreen->CloseScreen(idx, pScreen);
}

static Bool dmxSaveScreen(ScreenPtr pScreen, int what)
{
    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];

    if (dmxScreen->beDisplay) {
	switch (what) {
	case SCREEN_SAVER_OFF:
	case SCREEN_SAVER_FORCER:
	    XLIB_PROLOGUE (dmxScreen);
	    XResetScreenSaver(dmxScreen->beDisplay);
	    XLIB_EPILOGUE (dmxScreen);
	    dmxSync(dmxScreen, FALSE);
	    break;
	case SCREEN_SAVER_ON:
	case SCREEN_SAVER_CYCLE:
	    XLIB_PROLOGUE (dmxScreen);
	    XActivateScreenSaver(dmxScreen->beDisplay);
	    XLIB_EPILOGUE (dmxScreen);
	    dmxSync(dmxScreen, FALSE);
	    break;
	}
    }

    return TRUE;
}

void
dmxDiscardIgnore (DMXScreenInfo *dmxScreen,
		  unsigned long sequence)
{
    while (dmxScreen->ignoreHead)
    {
	if ((long) (sequence - dmxScreen->ignoreHead->sequence) > 0)
	{
	    DMXIgnore *next = dmxScreen->ignoreHead->next;

	    free (dmxScreen->ignoreHead);

	    dmxScreen->ignoreHead = next;
	    if (!dmxScreen->ignoreHead)
		dmxScreen->ignoreTail = &dmxScreen->ignoreHead;
	}
	else
	    break;
    }
}

void
dmxSetIgnore (DMXScreenInfo *dmxScreen,
	      unsigned long sequence)
{
    DMXIgnore *i;

    i = malloc (sizeof (DMXIgnore));
    if (!i)
	return;

    i->sequence = sequence;
    i->next     = 0;

    *(dmxScreen->ignoreTail) = i;
    dmxScreen->ignoreTail = &i->next;
}

Bool
dmxShouldIgnore (DMXScreenInfo *dmxScreen,
		 unsigned long sequence)
{
    dmxDiscardIgnore (dmxScreen, sequence);

    if (!dmxScreen->ignoreHead)
	return FALSE;

    return dmxScreen->ignoreHead->sequence == sequence;
}