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"
#include "dmxgrab.h"

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

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

#ifdef COMPOSITE
#include "dmxcomp.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 */
static int dmxDevicePrivateKeyIndex;
DevPrivateKey dmxDevicePrivateKey = &dmxDevicePrivateKeyIndex; /**< Private index for Devices */
#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 Bool
dmxScreenEventCheckExpose (ScreenPtr           pScreen,
			   xcb_generic_event_t *event)
{
    DMXScreenInfo      *dmxScreen = &dmxScreens[pScreen->myNum];
    xcb_expose_event_t *xexpose = (xcb_expose_event_t *) event;
    WindowPtr          pChild0, pChildN;

    if ((event->response_type & ~0x80) != XCB_EXPOSE)
	return FALSE;

    if (dmxShouldIgnore (dmxScreen, xexpose->sequence))
	return TRUE;

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

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

	if (pWinPriv->window == 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 + xexpose->x;
	box.y1 = pChild0->drawable.y + xexpose->y;
	box.x2 = box.x1 + xexpose->width;
	box.y2 = box.y1 + xexpose->height;

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

    return TRUE;
}

static Bool
dmxScreenEventCheckManageWindow (ScreenPtr	     pScreen,
				 xcb_generic_event_t *event)
{
    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
    WindowPtr     pChild = WindowTable[pScreen->myNum];
    Window        xWindow;

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

    xcb_circulate_request_event_t *xcirculaterequest =
	(xcb_circulate_request_event_t *) event;
    xcb_configure_request_event_t *xconfigurerequest =
	(xcb_configure_request_event_t *) event;
    xcb_map_request_event_t *xmaprequest =
	(xcb_map_request_event_t *) event;
    xcb_client_message_event_t *xclient =
	(xcb_client_message_event_t *) event;

    switch (event->response_type & ~0x80) {
    case XCB_CIRCULATE_REQUEST:
	xWindow = xcirculaterequest->window;
	break;
    case XCB_CONFIGURE_REQUEST:
	xWindow = xconfigurerequest->window;
	break;
    case XCB_MAP_REQUEST:
	xWindow = xmaprequest->window;
	break;
    case XCB_CLIENT_MESSAGE:
	xWindow = xclient->window;
	break;
    default:
	return FALSE;
    }

    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 (event->response_type & ~0x80) {
	case XCB_CIRCULATE_REQUEST:
	    vlist[0] = None;

	    if (xcirculaterequest->place == XCB_PLACE_ON_TOP)
		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 XCB_CONFIGURE_REQUEST:
	    mask = xconfigurerequest->value_mask;

	    if (mask & (XCB_CONFIG_WINDOW_X | XCB_CONFIG_WINDOW_Y))
	    {
		vlist[i++] = xconfigurerequest->x;
		vlist[i++] = xconfigurerequest->y;
	    }

	    if (mask & (XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT))
	    {
		vlist[i++] = xconfigurerequest->width;
		vlist[i++] = xconfigurerequest->height;
	    }

	    if (mask & XCB_CONFIG_WINDOW_BORDER_WIDTH)
		vlist[i++] = xconfigurerequest->border_width;

	    if (mask & XCB_CONFIG_WINDOW_SIBLING)
	    {
		/* ignore stacking requests with sibling */
		if (xconfigurerequest->sibling == None)
		    vlist[i++] = None;
		else
		    mask &= ~(XCB_CONFIG_WINDOW_SIBLING |
			      XCB_CONFIG_WINDOW_STACK_MODE);
	    }

	    if (mask & XCB_CONFIG_WINDOW_STACK_MODE)
		vlist[i++] = xconfigurerequest->stack_mode;

#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 XCB_MAP_REQUEST:

#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 XCB_CLIENT_MESSAGE:
	    x.u.u.type               = ClientMessage | 0x80;
	    x.u.u.detail             = xclient->format;
	    x.u.clientMessage.window = pChild->drawable.id;

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

	    if (!name)
		break;

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

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

		for (i = 0; i < 20; i++)
		    x.u.clientMessage.u.b.bytes[i] = xclient->data.data8[i];
		break;
	    case 16:
		x.u.clientMessage.u.s.type = type;

		x.u.clientMessage.u.s.shorts0 = xclient->data.data16[0];
		x.u.clientMessage.u.s.shorts1 = xclient->data.data16[1];
		x.u.clientMessage.u.s.shorts2 = xclient->data.data16[2];
		x.u.clientMessage.u.s.shorts3 = xclient->data.data16[3];
		x.u.clientMessage.u.s.shorts4 = xclient->data.data16[4];
		x.u.clientMessage.u.s.shorts5 = xclient->data.data16[5];
		x.u.clientMessage.u.s.shorts6 = xclient->data.data16[6];
		x.u.clientMessage.u.s.shorts7 = xclient->data.data16[7];
		x.u.clientMessage.u.s.shorts8 = xclient->data.data16[8];
		x.u.clientMessage.u.s.shorts9 = xclient->data.data16[9];
		break;
	    case 32:
		x.u.clientMessage.u.l.type = type;

		x.u.clientMessage.u.l.longs0 = xclient->data.data32[0];
		x.u.clientMessage.u.l.longs1 = xclient->data.data32[1];
		x.u.clientMessage.u.l.longs2 = xclient->data.data32[2];
		x.u.clientMessage.u.l.longs3 = xclient->data.data32[3];
		x.u.clientMessage.u.l.longs4 = xclient->data.data32[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",
		    event->response_type & ~0x80);
    }
    else
    {
	XWindowChanges xwc;

	switch (event->response_type & ~0x80) {
	case XCB_CIRCULATE_REQUEST:
	    XLIB_PROLOGUE (dmxScreen);
	    if (xcirculaterequest->place == XCB_PLACE_ON_TOP)
		XRaiseWindow (dmxScreen->beDisplay,
			      xcirculaterequest->window);
	    else
		XLowerWindow (dmxScreen->beDisplay,
			      xcirculaterequest->window);
	    XLIB_EPILOGUE (dmxScreen);
	    break;
	case XCB_CONFIGURE_REQUEST:
	    xwc.x	     = xconfigurerequest->x;
	    xwc.y	     = xconfigurerequest->y;
	    xwc.width	     = xconfigurerequest->width;
	    xwc.height	     = xconfigurerequest->height;
	    xwc.border_width = xconfigurerequest->border_width;
	    xwc.sibling      = xconfigurerequest->sibling;
	    xwc.stack_mode   = xconfigurerequest->stack_mode;

	    XLIB_PROLOGUE (dmxScreen);
	    XConfigureWindow (dmxScreen->beDisplay,
			      xconfigurerequest->window,
			      xconfigurerequest->value_mask,
			      &xwc);
	    XLIB_EPILOGUE (dmxScreen);
	    break;
	case XCB_MAP_REQUEST:
	    XLIB_PROLOGUE (dmxScreen);
	    XMapWindow (dmxScreen->beDisplay, xmaprequest->window);
	    XLIB_EPILOGUE (dmxScreen);
	    break;
	case XCB_CLIENT_MESSAGE:
	    break;
	}
    }

    return TRUE;
}

static Bool
dmxScreenEventCheckIgnore (ScreenPtr	       pScreen,
			   xcb_generic_event_t *event)
{
    switch (event->response_type & ~0x80) {
    case XCB_MAPPING_NOTIFY:
	return TRUE;
    default:
	break;
    }

    return FALSE;
}

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

    if (xcb_connection_has_error (dmxScreen->connection))
    {
	int i;

	dmxScreen->alive = FALSE;

	dmxLogOutput (dmxScreen, "Detect broken connection\n");
	dmxDetachScreen (pScreen->myNum);

	for (i = 0; i < dmxNumScreens; i++)
	    if (i != pScreen->myNum && dmxScreens[i].beDisplay)
		break;

	if (i == dmxNumScreens)
	    dmxLog (dmxFatal, "No back-end server connection, "
		    "giving up\n");
    }
}

static void
dmxScreenBlockHandler (pointer   blockData,
		       OSTimePtr pTimeout,
		       pointer   pReadMask)
{
    ScreenPtr     pScreen = (ScreenPtr) blockData;
    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];

    if (dmxScreen->beDisplay)
    {
	xcb_flush (dmxScreen->connection);
	dmxScreenCheckForError (pScreen);
    }
}

static void
dmxScreenWakeupHandler (pointer blockData,
			int     result,
			pointer pReadMask)
{
    ScreenPtr     pScreen = (ScreenPtr) blockData;
    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];

    if (dmxScreen->beDisplay)
    {
	xcb_generic_event_t *event;

	while ((event = xcb_poll_for_event (dmxScreen->connection)))
	{
	    if (!dmxScreenEventCheckInput (pScreen, event)        &&
		!dmxScreenEventCheckManageWindow (pScreen, event) &&
		!dmxScreenEventCheckExpose (pScreen, event)       &&

#ifdef RANDR
		!dmxScreenEventCheckRR (pScreen, event)           &&
#endif

		!dmxScreenEventCheckIgnore (pScreen, event))
	    {
		dmxLogOutput (dmxScreen, "unhandled event type %d\n",
			      event->response_type);
	    }

	    free (event);
	}
    }
}

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 COMPOSITE
	if (!noCompositeExtension)
	    dmxResetComposite();
#endif
#ifdef RENDER
	if (!noRenderExtension)
	    dmxResetRender();
#endif
	dmxResetGrabs();
	dmxResetProps();
	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;
}