xref: /xsrc/external/mit/xorg-server/dist/Xext/saver.c

/*
 *
Copyright (c) 1992  X Consortium

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 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 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 NONINFRINGEMENT.  IN NO EVENT SHALL THE
X CONSORTIUM 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.

Except as contained in this notice, the name of the X Consortium shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from the X Consortium.
 *
 * Author:  Keith Packard, MIT X Consortium
 */


#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif

#include <X11/X.h>
#include <X11/Xproto.h>
#include "misc.h"
#include "os.h"
#include "windowstr.h"
#include "scrnintstr.h"
#include "pixmapstr.h"
#include "extnsionst.h"
#include "dixstruct.h"
#include "resource.h"
#include "opaque.h"
#include <X11/extensions/saverproto.h>
#include "gcstruct.h"
#include "cursorstr.h"
#include "colormapst.h"
#include "xace.h"
#ifdef PANORAMIX
#include "panoramiX.h"
#include "panoramiXsrv.h"
#endif
#ifdef DPMSExtension
#include <X11/extensions/dpmsconst.h>
#endif
#include "protocol-versions.h"

#include <stdio.h>

#include "modinit.h"

static int ScreenSaverEventBase = 0;


static Bool ScreenSaverHandle (
	ScreenPtr /* pScreen */,
	int /* xstate */,
	Bool /* force */
	);

static Bool
CreateSaverWindow (
	ScreenPtr /* pScreen */
	);

static Bool
DestroySaverWindow (
	ScreenPtr /* pScreen */
	);

static void
UninstallSaverColormap (
	ScreenPtr /* pScreen */
	);

static void
CheckScreenPrivate (
	ScreenPtr /* pScreen */
	);

static void SScreenSaverNotifyEvent (
	xScreenSaverNotifyEvent * /* from */,
	xScreenSaverNotifyEvent * /* to */
	);

static RESTYPE SuspendType;  /* resource type for suspension records */

typedef struct _ScreenSaverSuspension *ScreenSaverSuspensionPtr;

/* List of clients that are suspending the screensaver. */
static ScreenSaverSuspensionPtr suspendingClients = NULL;

/*
 * clientResource is a resource ID that's added when the record is
 * allocated, so the record is freed and the screensaver resumed when
 * the client disconnects. count is the number of times the client has
 * requested the screensaver be suspended.
 */
typedef struct _ScreenSaverSuspension
{
    ScreenSaverSuspensionPtr  next;
    ClientPtr                 pClient;
    XID                       clientResource;
    int                       count;
} ScreenSaverSuspensionRec;

static int ScreenSaverFreeSuspend(
    pointer /*value */,
    XID /* id */
);

/*
 * each screen has a list of clients requesting
 * ScreenSaverNotify events.  Each client has a resource
 * for each screen it selects ScreenSaverNotify input for,
 * this resource is used to delete the ScreenSaverNotifyRec
 * entry from the per-screen queue.
 */

static RESTYPE SaverEventType;   /* resource type for event masks */

typedef struct _ScreenSaverEvent *ScreenSaverEventPtr;

typedef struct _ScreenSaverEvent {
    ScreenSaverEventPtr	next;
    ClientPtr		client;
    ScreenPtr		screen;
    XID			resource;
    CARD32		mask;
} ScreenSaverEventRec;

static int ScreenSaverFreeEvents(
    pointer /* value */,
    XID /* id */
);

static Bool setEventMask (
    ScreenPtr /* pScreen */,
    ClientPtr /* client */,
    unsigned long /* mask */
);

static unsigned long getEventMask (
    ScreenPtr /* pScreen */,
    ClientPtr /* client */
);

/*
 * when a client sets the screen saver attributes, a resource is
 * kept to be freed when the client exits
 */

static RESTYPE AttrType;    /* resource type for attributes */

typedef struct _ScreenSaverAttr {
    ScreenPtr	    screen;
    ClientPtr	    client;
    XID		    resource;
    short	    x, y;
    unsigned short  width, height, borderWidth;
    unsigned char   class;
    unsigned char   depth;
    VisualID	    visual;
    CursorPtr	    pCursor;
    PixmapPtr	    pBackgroundPixmap;
    PixmapPtr	    pBorderPixmap;
    Colormap	    colormap;
    unsigned long   mask;		/* no pixmaps or cursors */
    unsigned long   *values;
} ScreenSaverAttrRec, *ScreenSaverAttrPtr;

static int ScreenSaverFreeAttr (
    pointer /* value */,
    XID /* id */
);

static void FreeAttrs (
    ScreenSaverAttrPtr	/* pAttr */
);

static void FreeScreenAttr (
    ScreenSaverAttrPtr	/* pAttr */
);

static void
SendScreenSaverNotify (
    ScreenPtr /* pScreen */,
    int /* state */,
    Bool /* forced */
);

typedef struct _ScreenSaverScreenPrivate {
    ScreenSaverEventPtr	    events;
    ScreenSaverAttrPtr	    attr;
    Bool		    hasWindow;
    Colormap		    installedMap;
} ScreenSaverScreenPrivateRec, *ScreenSaverScreenPrivatePtr;

static ScreenSaverScreenPrivatePtr
MakeScreenPrivate (
	ScreenPtr /* pScreen */
	);

static DevPrivateKeyRec ScreenPrivateKeyRec;
#define ScreenPrivateKey (&ScreenPrivateKeyRec)

#define GetScreenPrivate(s) ((ScreenSaverScreenPrivatePtr) \
    dixLookupPrivate(&(s)->devPrivates, ScreenPrivateKey))
#define SetScreenPrivate(s,v) \
    dixSetPrivate(&(s)->devPrivates, ScreenPrivateKey, v);
#define SetupScreen(s)	ScreenSaverScreenPrivatePtr pPriv = (s ? GetScreenPrivate(s) : NULL)

#define New(t)	(malloc(sizeof (t)))

static void
CheckScreenPrivate (ScreenPtr pScreen)
{
    SetupScreen (pScreen);

    if (!pPriv)
	return;
    if (!pPriv->attr && !pPriv->events &&
	!pPriv->hasWindow && pPriv->installedMap == None)
    {
	free(pPriv);
	SetScreenPrivate (pScreen, NULL);
	pScreen->screensaver.ExternalScreenSaver = NULL;
    }
}

static ScreenSaverScreenPrivatePtr
MakeScreenPrivate (ScreenPtr pScreen)
{
    SetupScreen (pScreen);

    if (pPriv)
	return pPriv;
    pPriv = New (ScreenSaverScreenPrivateRec);
    if (!pPriv)
	return 0;
    pPriv->events = 0;
    pPriv->attr = 0;
    pPriv->hasWindow = FALSE;
    pPriv->installedMap = None;
    SetScreenPrivate (pScreen, pPriv);
    pScreen->screensaver.ExternalScreenSaver = ScreenSaverHandle;
    return pPriv;
}

static unsigned long
getEventMask (ScreenPtr pScreen, ClientPtr client)
{
    SetupScreen(pScreen);
    ScreenSaverEventPtr	pEv;

    if (!pPriv)
	return 0;
    for (pEv = pPriv->events; pEv; pEv = pEv->next)
	if (pEv->client == client)
	    return pEv->mask;
    return 0;
}

static Bool
setEventMask (ScreenPtr pScreen, ClientPtr client, unsigned long mask)
{
    SetupScreen(pScreen);
    ScreenSaverEventPtr	pEv, *pPrev;

    if (getEventMask (pScreen, client) == mask)
	return TRUE;
    if (!pPriv)
    {
	pPriv = MakeScreenPrivate (pScreen);
	if (!pPriv)
	    return FALSE;
    }
    for (pPrev = &pPriv->events; (pEv = *pPrev) != 0; pPrev = &pEv->next)
	if (pEv->client == client)
	    break;
    if (mask == 0)
    {
	FreeResource (pEv->resource, SaverEventType);
	*pPrev = pEv->next;
	free(pEv);
	CheckScreenPrivate (pScreen);
    }
    else
    {
    	if (!pEv)
    	{
	    pEv = New (ScreenSaverEventRec);
	    if (!pEv)
	    {
		CheckScreenPrivate (pScreen);
	    	return FALSE;
	    }
    	    *pPrev = pEv;
    	    pEv->next = NULL;
    	    pEv->client = client;
    	    pEv->screen = pScreen;
    	    pEv->resource = FakeClientID (client->index);
	    if (!AddResource (pEv->resource, SaverEventType, (pointer) pEv))
		return FALSE;
    	}
	pEv->mask = mask;
    }
    return TRUE;
}

static void
FreeAttrs (ScreenSaverAttrPtr pAttr)
{
    PixmapPtr	    pPixmap;
    CursorPtr	    pCursor;

    if ((pPixmap = pAttr->pBackgroundPixmap) != 0)
	(*pPixmap->drawable.pScreen->DestroyPixmap)(pPixmap);
    if ((pPixmap = pAttr->pBorderPixmap) != 0)
	(*pPixmap->drawable.pScreen->DestroyPixmap)(pPixmap);
    if ((pCursor = pAttr->pCursor) != 0)
	FreeCursor (pCursor, (Cursor) 0);
}

static void
FreeScreenAttr (ScreenSaverAttrPtr pAttr)
{
    FreeAttrs (pAttr);
    free(pAttr->values);
    free(pAttr);
}

static int
ScreenSaverFreeEvents (pointer value, XID id)
{
    ScreenSaverEventPtr	pOld = (ScreenSaverEventPtr)value;
    ScreenPtr pScreen = pOld->screen;
    SetupScreen (pScreen);
    ScreenSaverEventPtr	pEv, *pPrev;

    if (!pPriv)
	return TRUE;
    for (pPrev = &pPriv->events; (pEv = *pPrev) != 0; pPrev = &pEv->next)
	if (pEv == pOld)
	    break;
    if (!pEv)
	return TRUE;
    *pPrev = pEv->next;
    free(pEv);
    CheckScreenPrivate (pScreen);
    return TRUE;
}

static int
ScreenSaverFreeAttr (pointer value, XID id)
{
    ScreenSaverAttrPtr	pOldAttr = (ScreenSaverAttrPtr)value;
    ScreenPtr	pScreen = pOldAttr->screen;
    SetupScreen (pScreen);

    if (!pPriv)
	return TRUE;
    if (pPriv->attr != pOldAttr)
	return TRUE;
    FreeScreenAttr (pOldAttr);
    pPriv->attr = NULL;
    if (pPriv->hasWindow)
    {
	dixSaveScreens (serverClient, SCREEN_SAVER_FORCER, ScreenSaverReset);
	dixSaveScreens (serverClient, SCREEN_SAVER_FORCER, ScreenSaverActive);
    }
    CheckScreenPrivate (pScreen);
    return TRUE;
}

static int
ScreenSaverFreeSuspend (pointer value, XID id)
{
    ScreenSaverSuspensionPtr data = (ScreenSaverSuspensionPtr) value;
    ScreenSaverSuspensionPtr *prev, this;

    /* Unlink and free the suspension record for the client */
    for (prev = &suspendingClients; (this = *prev); prev = &this->next)
    {
	if (this == data)
	{
	    *prev = this->next;
	    free(this);
	    break;
	}
    }

    /* Reenable the screensaver if this was the last client suspending it. */
    if (screenSaverSuspended && suspendingClients == NULL)
    {
	screenSaverSuspended = FALSE;

	/* The screensaver could be active, since suspending it (by design)
	   doesn't prevent it from being forceably activated */
#ifdef DPMSExtension
	if (screenIsSaved != SCREEN_SAVER_ON && DPMSPowerLevel == DPMSModeOn)
#else
	if (screenIsSaved != SCREEN_SAVER_ON)
#endif
	{
	    UpdateCurrentTimeIf();
	    lastDeviceEventTime = currentTime;
	    SetScreenSaverTimer();
	}
    }

    return Success;
}

static void
SendScreenSaverNotify (ScreenPtr pScreen, int state, Bool forced)
{
    ScreenSaverScreenPrivatePtr	pPriv;
    ScreenSaverEventPtr		pEv;
    unsigned long		mask;
    xScreenSaverNotifyEvent	ev;
    int				kind;

    UpdateCurrentTimeIf ();
    mask = ScreenSaverNotifyMask;
    if (state == ScreenSaverCycle)
	mask = ScreenSaverCycleMask;
    pScreen = screenInfo.screens[pScreen->myNum];
    pPriv = GetScreenPrivate(pScreen);
    if (!pPriv)
	return;
    if (pPriv->attr)
	kind = ScreenSaverExternal;
    else if (ScreenSaverBlanking != DontPreferBlanking)
	kind = ScreenSaverBlanked;
    else
	kind = ScreenSaverInternal;
    for (pEv = pPriv->events; pEv; pEv = pEv->next)
    {
	if (!(pEv->mask & mask))
	    continue;
	ev.type = ScreenSaverNotify + ScreenSaverEventBase;
	ev.state = state;
	ev.timestamp = currentTime.milliseconds;
	ev.root = pScreen->root->drawable.id;
	ev.window = pScreen->screensaver.wid;
	ev.kind = kind;
	ev.forced = forced;
	WriteEventsToClient (pEv->client, 1, (xEvent *) &ev);
    }
}

static void
SScreenSaverNotifyEvent (xScreenSaverNotifyEvent *from,
                         xScreenSaverNotifyEvent *to)
{
    to->type = from->type;
    to->state = from->state;
    cpswaps (from->sequenceNumber, to->sequenceNumber);
    cpswapl (from->timestamp, to->timestamp);
    cpswapl (from->root, to->root);
    cpswapl (from->window, to->window);
    to->kind = from->kind;
    to->forced = from->forced;
}

static void
UninstallSaverColormap (ScreenPtr pScreen)
{
    SetupScreen(pScreen);
    ColormapPtr			pCmap;
    int rc;

    if (pPriv && pPriv->installedMap != None)
    {
	rc = dixLookupResourceByType((pointer *)&pCmap, pPriv->installedMap,
				     RT_COLORMAP, serverClient,
				     DixUninstallAccess);
	if (rc == Success)
	    (*pCmap->pScreen->UninstallColormap) (pCmap);
	pPriv->installedMap = None;
	CheckScreenPrivate (pScreen);
    }
}

static Bool
CreateSaverWindow (ScreenPtr pScreen)
{
    SetupScreen (pScreen);
    ScreenSaverStuffPtr		pSaver;
    ScreenSaverAttrPtr		pAttr;
    WindowPtr			pWin;
    int				result;
    unsigned long		mask;
    Colormap			*installedMaps;
    int				numInstalled;
    int				i;
    Colormap			wantMap;
    ColormapPtr			pCmap;

    pSaver = &pScreen->screensaver;
    if (pSaver->pWindow)
    {
	pSaver->pWindow = NullWindow;
	FreeResource (pSaver->wid, RT_NONE);
	if (pPriv)
	{
	    UninstallSaverColormap (pScreen);
	    pPriv->hasWindow = FALSE;
	    CheckScreenPrivate (pScreen);
	}
    }

    if (!pPriv || !(pAttr = pPriv->attr))
	return FALSE;

    pPriv->installedMap = None;

    if (GrabInProgress && GrabInProgress != pAttr->client->index)
	return FALSE;

    pWin = CreateWindow (pSaver->wid, pScreen->root,
			 pAttr->x, pAttr->y, pAttr->width, pAttr->height,
			 pAttr->borderWidth, pAttr->class,
			 pAttr->mask, (XID *)pAttr->values,
			 pAttr->depth, serverClient, pAttr->visual,
			 &result);
    if (!pWin)
	return FALSE;

    if (!AddResource(pWin->drawable.id, RT_WINDOW, pWin))
	return FALSE;

    mask = 0;
    if (pAttr->pBackgroundPixmap)
    {
	pWin->backgroundState = BackgroundPixmap;
	pWin->background.pixmap = pAttr->pBackgroundPixmap;
	pAttr->pBackgroundPixmap->refcnt++;
	mask |= CWBackPixmap;
    }
    if (pAttr->pBorderPixmap)
    {
	pWin->borderIsPixel = FALSE;
	pWin->border.pixmap = pAttr->pBorderPixmap;
	pAttr->pBorderPixmap->refcnt++;
	mask |= CWBorderPixmap;
    }
    if (pAttr->pCursor)
    {
	if (!pWin->optional)
	    if (!MakeWindowOptional (pWin))
	    {
    	    	FreeResource (pWin->drawable.id, RT_NONE);
    	    	return FALSE;
	    }
	pAttr->pCursor->refcnt++;
	if (pWin->optional->cursor)
	    FreeCursor (pWin->optional->cursor, (Cursor)0);
	pWin->optional->cursor = pAttr->pCursor;
	pWin->cursorIsNone = FALSE;
	CheckWindowOptionalNeed (pWin);
	mask |= CWCursor;
    }
    if (mask)
	(*pScreen->ChangeWindowAttributes) (pWin, mask);

    if (pAttr->colormap != None)
	(void) ChangeWindowAttributes (pWin, CWColormap, &pAttr->colormap,
				       serverClient);

    MapWindow (pWin, serverClient);

    pPriv->hasWindow = TRUE;
    pSaver->pWindow = pWin;

    /* check and install our own colormap if it isn't installed now */
    wantMap = wColormap (pWin);
    if (wantMap == None)
	return TRUE;
    installedMaps = malloc(pScreen->maxInstalledCmaps * sizeof (Colormap));
    numInstalled = (*pWin->drawable.pScreen->ListInstalledColormaps)
						    (pScreen, installedMaps);
    for (i = 0; i < numInstalled; i++)
	if (installedMaps[i] == wantMap)
	    break;

    free((char *) installedMaps);

    if (i < numInstalled)
	return TRUE;

    result = dixLookupResourceByType((pointer *)&pCmap, wantMap, RT_COLORMAP,
				     serverClient, DixInstallAccess);
    if (result != Success)
	return TRUE;

    pPriv->installedMap = wantMap;

    (*pCmap->pScreen->InstallColormap) (pCmap);

    return TRUE;
}

static Bool
DestroySaverWindow (ScreenPtr pScreen)
{
    SetupScreen(pScreen);
    ScreenSaverStuffPtr		pSaver;

    if (!pPriv || !pPriv->hasWindow)
	return FALSE;

    pSaver = &pScreen->screensaver;
    if (pSaver->pWindow)
    {
	pSaver->pWindow = NullWindow;
	FreeResource (pSaver->wid, RT_NONE);
    }
    pPriv->hasWindow = FALSE;
    CheckScreenPrivate (pScreen);
    UninstallSaverColormap (pScreen);
    return TRUE;
}

static Bool
ScreenSaverHandle (ScreenPtr pScreen, int xstate, Bool force)
{
    int				state = 0;
    Bool			ret = FALSE;
    ScreenSaverScreenPrivatePtr	pPriv;

    switch (xstate)
    {
    case SCREEN_SAVER_ON:
	state = ScreenSaverOn;
	ret = CreateSaverWindow (pScreen);
	break;
    case SCREEN_SAVER_OFF:
	state = ScreenSaverOff;
	ret = DestroySaverWindow (pScreen);
	break;
    case SCREEN_SAVER_CYCLE:
	state = ScreenSaverCycle;
	pPriv = GetScreenPrivate (pScreen);
	if (pPriv && pPriv->hasWindow)
	    ret = TRUE;

    }
#ifdef PANORAMIX
    if(noPanoramiXExtension || !pScreen->myNum)
#endif
       SendScreenSaverNotify (pScreen, state, force);
    return ret;
}

static int
ProcScreenSaverQueryVersion (ClientPtr client)
{
    xScreenSaverQueryVersionReply	rep;
    int		n;

    REQUEST_SIZE_MATCH (xScreenSaverQueryVersionReq);
    rep.type = X_Reply;
    rep.length = 0;
    rep.sequenceNumber = client->sequence;
    rep.majorVersion = SERVER_SAVER_MAJOR_VERSION;
    rep.minorVersion = SERVER_SAVER_MINOR_VERSION;
    if (client->swapped) {
    	swaps(&rep.sequenceNumber, n);
    	swapl(&rep.length, n);
    }
    WriteToClient(client, sizeof (xScreenSaverQueryVersionReply), (char *)&rep);
    return Success;
}

static int
ProcScreenSaverQueryInfo (ClientPtr client)
{
    REQUEST(xScreenSaverQueryInfoReq);
    xScreenSaverQueryInfoReply	rep;
    int		n, rc;
    ScreenSaverStuffPtr		pSaver;
    DrawablePtr			pDraw;
    CARD32			lastInput;
    ScreenSaverScreenPrivatePtr	pPriv;

    REQUEST_SIZE_MATCH (xScreenSaverQueryInfoReq);
    rc = dixLookupDrawable(&pDraw, stuff->drawable, client, 0,
			   DixGetAttrAccess);
    if (rc != Success)
	return rc;
    rc = XaceHook(XACE_SCREENSAVER_ACCESS, client, pDraw->pScreen,
		  DixGetAttrAccess);
    if (rc != Success)
	return rc;

    pSaver = &pDraw->pScreen->screensaver;
    pPriv = GetScreenPrivate (pDraw->pScreen);

    UpdateCurrentTime ();
    lastInput = GetTimeInMillis() - lastDeviceEventTime.milliseconds;

    rep.type = X_Reply;
    rep.length = 0;
    rep.sequenceNumber = client->sequence;
    rep.window = pSaver->wid;
    if (screenIsSaved != SCREEN_SAVER_OFF)
    {
	rep.state = ScreenSaverOn;
	if (ScreenSaverTime)
	    rep.tilOrSince = lastInput - ScreenSaverTime;
	else
	    rep.tilOrSince = 0;
    }
    else
    {
	if (ScreenSaverTime)
	{
	    rep.state = ScreenSaverOff;
	    if (ScreenSaverTime < lastInput)
		rep.tilOrSince = 0;
	    else
		rep.tilOrSince = ScreenSaverTime - lastInput;
	}
	else
	{
	    rep.state = ScreenSaverDisabled;
	    rep.tilOrSince = 0;
	}
    }
    rep.idle = lastInput;
    rep.eventMask = getEventMask (pDraw->pScreen, client);
    if (pPriv && pPriv->attr)
	rep.kind = ScreenSaverExternal;
    else if (ScreenSaverBlanking != DontPreferBlanking)
	rep.kind = ScreenSaverBlanked;
    else
	rep.kind = ScreenSaverInternal;
    if (client->swapped)
    {
	swaps (&rep.sequenceNumber, n);
	swapl (&rep.length, n);
	swapl (&rep.window, n);
	swapl (&rep.tilOrSince, n);
	swapl (&rep.idle, n);
	swapl (&rep.eventMask, n);
    }
    WriteToClient(client, sizeof (xScreenSaverQueryInfoReply), (char *)&rep);
    return Success;
}

static int
ProcScreenSaverSelectInput (ClientPtr client)
{
    REQUEST(xScreenSaverSelectInputReq);
    DrawablePtr			pDraw;
    int				rc;

    REQUEST_SIZE_MATCH (xScreenSaverSelectInputReq);
    rc = dixLookupDrawable (&pDraw, stuff->drawable, client, 0,
			    DixGetAttrAccess);
    if (rc != Success)
	return rc;

    rc = XaceHook(XACE_SCREENSAVER_ACCESS, client, pDraw->pScreen,
		  DixSetAttrAccess);
    if (rc != Success)
	return rc;

    if (!setEventMask (pDraw->pScreen, client, stuff->eventMask))
	return BadAlloc;
    return Success;
}

static int
ScreenSaverSetAttributes (ClientPtr client)
{
    REQUEST(xScreenSaverSetAttributesReq);
    DrawablePtr			pDraw;
    WindowPtr			pParent;
    ScreenPtr			pScreen;
    ScreenSaverScreenPrivatePtr pPriv = 0;
    ScreenSaverAttrPtr		pAttr = 0;
    int				ret, len, class, bw, depth;
    unsigned long		visual;
    int				idepth, ivisual;
    Bool			fOK;
    DepthPtr			pDepth;
    WindowOptPtr		ancwopt;
    unsigned int		*pVlist;
    unsigned long		*values = 0;
    unsigned long		tmask, imask;
    unsigned long		val;
    Pixmap			pixID;
    PixmapPtr			pPixmap;
    Cursor			cursorID;
    CursorPtr			pCursor;
    Colormap			cmap;
    ColormapPtr			pCmap;

    REQUEST_AT_LEAST_SIZE (xScreenSaverSetAttributesReq);
    ret = dixLookupDrawable(&pDraw, stuff->drawable, client, 0,
			    DixGetAttrAccess);
    if (ret != Success)
	return ret;
    pScreen = pDraw->pScreen;
    pParent = pScreen->root;

    ret = XaceHook(XACE_SCREENSAVER_ACCESS, client, pScreen, DixSetAttrAccess);
    if (ret != Success)
	return ret;

    len = stuff->length -  bytes_to_int32(sizeof(xScreenSaverSetAttributesReq));
    if (Ones(stuff->mask) != len)
        return BadLength;
    if (!stuff->width || !stuff->height)
    {
	client->errorValue = 0;
        return BadValue;
    }
    switch (class = stuff->c_class)
    {
    case CopyFromParent:
    case InputOnly:
    case InputOutput:
	break;
    default:
	client->errorValue = class;
	return BadValue;
    }
    bw = stuff->borderWidth;
    depth = stuff->depth;
    visual = stuff->visualID;

    /* copied directly from CreateWindow */

    if (class == CopyFromParent)
	class = pParent->drawable.class;

    if ((class != InputOutput) && (class != InputOnly))
    {
	client->errorValue = class;
	return BadValue;
    }

    if ((class != InputOnly) && (pParent->drawable.class == InputOnly))
        return BadMatch;

    if ((class == InputOnly) && ((bw != 0) || (depth != 0)))
        return BadMatch;

    if ((class == InputOutput) && (depth == 0))
        depth = pParent->drawable.depth;
    ancwopt = pParent->optional;
    if (!ancwopt)
	ancwopt = FindWindowWithOptional(pParent)->optional;
    if (visual == CopyFromParent)
	visual = ancwopt->visual;

    /* Find out if the depth and visual are acceptable for this Screen */
    if ((visual != ancwopt->visual) || (depth != pParent->drawable.depth))
    {
	fOK = FALSE;
	for(idepth = 0; idepth < pScreen->numDepths; idepth++)
	{
	    pDepth = (DepthPtr) &pScreen->allowedDepths[idepth];
	    if ((depth == pDepth->depth) || (depth == 0))
	    {
		for (ivisual = 0; ivisual < pDepth->numVids; ivisual++)
		{
		    if (visual == pDepth->vids[ivisual])
		    {
			fOK = TRUE;
			break;
		    }
		}
	    }
	}
	if (fOK == FALSE)
	    return BadMatch;
    }

    if (((stuff->mask & (CWBorderPixmap | CWBorderPixel)) == 0) &&
	(class != InputOnly) &&
	(depth != pParent->drawable.depth))
    {
        return BadMatch;
    }

    if (((stuff->mask & CWColormap) == 0) &&
	(class != InputOnly) &&
	((visual != ancwopt->visual) || (ancwopt->colormap == None)))
    {
	return BadMatch;
    }

    /* end of errors from CreateWindow */

    pPriv = GetScreenPrivate (pScreen);
    if (pPriv && pPriv->attr)
    {
	if (pPriv->attr->client != client)
	    return BadAccess;
    }
    if (!pPriv)
    {
	pPriv = MakeScreenPrivate (pScreen);
	if (!pPriv)
	    return FALSE;
    }
    pAttr = New (ScreenSaverAttrRec);
    if (!pAttr)
    {
	ret = BadAlloc;
	goto bail;
    }
    /* over allocate for override redirect */
    values = malloc((len + 1) * sizeof (unsigned long));
    if (!values)
    {
	ret = BadAlloc;
	goto bail;
    }
    pAttr->screen = pScreen;
    pAttr->client = client;
    pAttr->x = stuff->x;
    pAttr->y = stuff->y;
    pAttr->width = stuff->width;
    pAttr->height = stuff->height;
    pAttr->borderWidth = stuff->borderWidth;
    pAttr->class = stuff->c_class;
    pAttr->depth = depth;
    pAttr->visual = visual;
    pAttr->colormap = None;
    pAttr->pCursor = NullCursor;
    pAttr->pBackgroundPixmap = NullPixmap;
    pAttr->pBorderPixmap = NullPixmap;
    pAttr->values = values;
    /*
     * go through the mask, checking the values,
     * looking up pixmaps and cursors and hold a reference
     * to them.
     */
    pAttr->mask = tmask = stuff->mask | CWOverrideRedirect;
    pVlist = (unsigned int *) (stuff + 1);
    while (tmask) {
	imask = lowbit (tmask);
	tmask &= ~imask;
	switch (imask)
        {
	case CWBackPixmap:
	    pixID = (Pixmap )*pVlist;
	    if (pixID == None)
	    {
		*values++ = None;
	    }
	    else if (pixID == ParentRelative)
	    {
		if (depth != pParent->drawable.depth)
		{
		    ret = BadMatch;
		    goto PatchUp;
		}
		*values++ = ParentRelative;
	    }
            else
	    {
		ret = dixLookupResourceByType((pointer *)&pPixmap, pixID, RT_PIXMAP,
					client, DixReadAccess);
		if (ret == Success)
		{
                    if  ((pPixmap->drawable.depth != depth) ||
			 (pPixmap->drawable.pScreen != pScreen))
		    {
                        ret = BadMatch;
			goto PatchUp;
		    }
		    pAttr->pBackgroundPixmap = pPixmap;
		    pPixmap->refcnt++;
		    pAttr->mask &= ~CWBackPixmap;
		}
	        else
		{
		    client->errorValue = pixID;
		    goto PatchUp;
		}
	    }
	    break;
	case CWBackPixel:
	    *values++ = (CARD32) *pVlist;
	    break;
	case CWBorderPixmap:
	    pixID = (Pixmap ) *pVlist;
	    if (pixID == CopyFromParent)
	    {
		if (depth != pParent->drawable.depth)
		{
		    ret = BadMatch;
		    goto PatchUp;
		}
		*values++ = CopyFromParent;
	    }
	    else
	    {
		ret = dixLookupResourceByType((pointer *)&pPixmap, pixID, RT_PIXMAP,
					client, DixReadAccess);
		if (ret == Success)
		{
                    if  ((pPixmap->drawable.depth != depth) ||
			 (pPixmap->drawable.pScreen != pScreen))
		    {
			ret = BadMatch;
			goto PatchUp;
		    }
		    pAttr->pBorderPixmap = pPixmap;
		    pPixmap->refcnt++;
		    pAttr->mask &= ~CWBorderPixmap;
		}
    	        else
		{
		    client->errorValue = pixID;
		    goto PatchUp;
		}
	    }
	    break;
	case CWBorderPixel:
            *values++ = (CARD32) *pVlist;
            break;
	case CWBitGravity:
	    val = (CARD8 )*pVlist;
	    if (val > StaticGravity)
	    {
		ret = BadValue;
		client->errorValue = val;
		goto PatchUp;
	    }
	    *values++ = val;
	    break;
	case CWWinGravity:
	    val = (CARD8 )*pVlist;
	    if (val > StaticGravity)
	    {
		ret = BadValue;
		client->errorValue = val;
		goto PatchUp;
	    }
	    *values++ = val;
	    break;
	case CWBackingStore:
	    val = (CARD8 )*pVlist;
	    if ((val != NotUseful) && (val != WhenMapped) && (val != Always))
	    {
		ret = BadValue;
		client->errorValue = val;
		goto PatchUp;
	    }
	    *values++ = val;
	    break;
	case CWBackingPlanes:
	    *values++ = (CARD32) *pVlist;
	    break;
	case CWBackingPixel:
	    *values++ = (CARD32) *pVlist;
	    break;
	case CWSaveUnder:
	    val = (BOOL) *pVlist;
	    if ((val != xTrue) && (val != xFalse))
	    {
		ret = BadValue;
		client->errorValue = val;
		goto PatchUp;
	    }
	    *values++ = val;
	    break;
	case CWEventMask:
	    *values++ = (CARD32) *pVlist;
	    break;
	case CWDontPropagate:
	    *values++ = (CARD32) *pVlist;
	    break;
	case CWOverrideRedirect:
	    if (!(stuff->mask & CWOverrideRedirect))
		pVlist--;
	    else
	    {
	    	val = (BOOL ) *pVlist;
	    	if ((val != xTrue) && (val != xFalse))
	    	{
		    ret = BadValue;
		    client->errorValue = val;
		    goto PatchUp;
	    	}
	    }
	    *values++ = xTrue;
	    break;
	case CWColormap:
	    cmap = (Colormap) *pVlist;
	    ret = dixLookupResourceByType((pointer *)&pCmap, cmap, RT_COLORMAP,
				    client, DixUseAccess);
	    if (ret != Success)
	    {
		client->errorValue = cmap;
		goto PatchUp;
	    }
	    if (pCmap->pVisual->vid != visual || pCmap->pScreen != pScreen)
	    {
		ret = BadMatch;
		goto PatchUp;
	    }
	    pAttr->colormap = cmap;
	    pAttr->mask &= ~CWColormap;
	    break;
	case CWCursor:
	    cursorID = (Cursor ) *pVlist;
	    if ( cursorID == None)
	    {
		*values++ = None;
	    }
	    else
	    {
		ret = dixLookupResourceByType((pointer *)&pCursor, cursorID,
					RT_CURSOR, client, DixUseAccess);
	    	if (ret != Success)
	    	{
		    client->errorValue = cursorID;
		    goto PatchUp;
	    	}
		pCursor->refcnt++;
		pAttr->pCursor = pCursor;
		pAttr->mask &= ~CWCursor;
	    }
	    break;
     	 default:
	    ret = BadValue;
	    client->errorValue = stuff->mask;
	    goto PatchUp;
	}
	pVlist++;
    }
    if (pPriv->attr)
	FreeScreenAttr (pPriv->attr);
    pPriv->attr = pAttr;
    pAttr->resource = FakeClientID (client->index);
    if (!AddResource (pAttr->resource, AttrType, (pointer) pAttr))
	return BadAlloc;
    return Success;
PatchUp:
    FreeAttrs (pAttr);
bail:
    CheckScreenPrivate (pScreen);
    if (pAttr) free(pAttr->values);
    free(pAttr);
    return ret;
}

static int
ScreenSaverUnsetAttributes (ClientPtr client)
{
    REQUEST(xScreenSaverSetAttributesReq);
    DrawablePtr			pDraw;
    ScreenSaverScreenPrivatePtr	pPriv;
    int				rc;

    REQUEST_SIZE_MATCH (xScreenSaverUnsetAttributesReq);
    rc = dixLookupDrawable(&pDraw, stuff->drawable, client, 0,
			   DixGetAttrAccess);
    if (rc != Success)
	return rc;
    pPriv = GetScreenPrivate (pDraw->pScreen);
    if (pPriv && pPriv->attr && pPriv->attr->client == client)
    {
	FreeResource (pPriv->attr->resource, AttrType);
    	FreeScreenAttr (pPriv->attr);
	pPriv->attr = NULL;
	CheckScreenPrivate (pDraw->pScreen);
    }
    return Success;
}

static int
ProcScreenSaverSetAttributes (ClientPtr client)
{
#ifdef PANORAMIX
    if(!noPanoramiXExtension) {
       REQUEST(xScreenSaverSetAttributesReq);
       PanoramiXRes *draw;
       PanoramiXRes *backPix = NULL;
       PanoramiXRes *bordPix = NULL;
       PanoramiXRes *cmap    = NULL;
       int i, status, len;
       int  pback_offset = 0, pbord_offset = 0, cmap_offset = 0;
       XID orig_visual, tmp;

       REQUEST_AT_LEAST_SIZE (xScreenSaverSetAttributesReq);

       status = dixLookupResourceByClass((pointer *)&draw, stuff->drawable,
					 XRC_DRAWABLE, client, DixWriteAccess);
       if (status != Success)
           return (status == BadValue) ? BadDrawable : status;

       len = stuff->length -  bytes_to_int32(sizeof(xScreenSaverSetAttributesReq));
       if (Ones(stuff->mask) != len)
           return BadLength;

       if((Mask)stuff->mask & CWBackPixmap) {
          pback_offset = Ones((Mask)stuff->mask & (CWBackPixmap - 1));
          tmp = *((CARD32 *) &stuff[1] + pback_offset);
          if ((tmp != None) && (tmp != ParentRelative)) {
	      status = dixLookupResourceByType((pointer *)&backPix, tmp,
					       XRT_PIXMAP, client,
					       DixReadAccess);
	      if (status != Success)
		  return status;
          }
       }

       if ((Mask)stuff->mask & CWBorderPixmap) {
          pbord_offset = Ones((Mask)stuff->mask & (CWBorderPixmap - 1));
          tmp = *((CARD32 *) &stuff[1] + pbord_offset);
          if (tmp != CopyFromParent) {
	      status = dixLookupResourceByType((pointer *)&bordPix, tmp,
					       XRT_PIXMAP, client,
					       DixReadAccess);
	      if (status != Success)
		  return status;
          }
       }

       if ((Mask)stuff->mask & CWColormap) {
           cmap_offset = Ones((Mask)stuff->mask & (CWColormap - 1));
           tmp = *((CARD32 *) &stuff[1] + cmap_offset);
           if ((tmp != CopyFromParent) && (tmp != None)) {
	       status = dixLookupResourceByType((pointer *)&cmap, tmp,
						XRT_COLORMAP, client,
						DixReadAccess);
	       if (status != Success)
		   return status;
           }
       }

       orig_visual = stuff->visualID;

       FOR_NSCREENS_BACKWARD(i) {
          stuff->drawable = draw->info[i].id;
          if (backPix)
             *((CARD32 *) &stuff[1] + pback_offset) = backPix->info[i].id;
          if (bordPix)
             *((CARD32 *) &stuff[1] + pbord_offset) = bordPix->info[i].id;
          if (cmap)
             *((CARD32 *) &stuff[1] + cmap_offset) = cmap->info[i].id;

          if (orig_visual != CopyFromParent)
            stuff->visualID = PanoramiXTranslateVisualID(i, orig_visual);

          status = ScreenSaverSetAttributes(client);
       }

       return status;
    }
#endif

    return ScreenSaverSetAttributes(client);
}

static int
ProcScreenSaverUnsetAttributes (ClientPtr client)
{
#ifdef PANORAMIX
    if(!noPanoramiXExtension) {
       REQUEST(xScreenSaverUnsetAttributesReq);
       PanoramiXRes *draw;
       int rc, i;

       rc = dixLookupResourceByClass((pointer *)&draw, stuff->drawable,
				     XRC_DRAWABLE, client, DixWriteAccess);
       if (rc != Success)
           return (rc == BadValue) ? BadDrawable : rc;

       for(i = PanoramiXNumScreens - 1; i > 0; i--) {
            stuff->drawable = draw->info[i].id;
            ScreenSaverUnsetAttributes(client);
       }

       stuff->drawable = draw->info[0].id;
    }
#endif

    return ScreenSaverUnsetAttributes(client);
}

static int
ProcScreenSaverSuspend (ClientPtr client)
{
    ScreenSaverSuspensionPtr *prev, this;

    REQUEST(xScreenSaverSuspendReq);
    REQUEST_SIZE_MATCH(xScreenSaverSuspendReq);

    /* Check if this client is suspending the screensaver */
    for (prev = &suspendingClients; (this = *prev); prev = &this->next)
	if (this->pClient == client)
	    break;

    if (this)
    {
	if (stuff->suspend == TRUE)
	   this->count++;
	else if (--this->count == 0)
	   FreeResource (this->clientResource, RT_NONE);

	return Success;
    }

    /* If we get to this point, this client isn't suspending the screensaver */
    if (stuff->suspend == FALSE)
	return Success;

    /*
     * Allocate a suspension record for the client, and stop the screensaver
     * if it isn't already suspended by another client. We attach a resource ID
     * to the record, so the screensaver will be reenabled and the record freed
     * if the client disconnects without reenabling it first.
     */
    this = malloc(sizeof (ScreenSaverSuspensionRec));

    if (!this)
	return BadAlloc;

    this->next           = NULL;
    this->pClient        = client;
    this->count          = 1;
    this->clientResource = FakeClientID (client->index);

    if (!AddResource (this->clientResource, SuspendType, (pointer) this))
    {
	free(this);
	return BadAlloc;
    }

    *prev = this;
    if (!screenSaverSuspended)
    {
	screenSaverSuspended = TRUE;
	FreeScreenSaverTimer();
    }

    return Success;
}

static int (*NormalVector[]) (ClientPtr /* client */) = {
    ProcScreenSaverQueryVersion,
    ProcScreenSaverQueryInfo,
    ProcScreenSaverSelectInput,
    ProcScreenSaverSetAttributes,
    ProcScreenSaverUnsetAttributes,
    ProcScreenSaverSuspend,
};

#define NUM_REQUESTS	((sizeof NormalVector) / (sizeof NormalVector[0]))

static int
ProcScreenSaverDispatch (ClientPtr client)
{
    REQUEST(xReq);

    if (stuff->data < NUM_REQUESTS)
	return (*NormalVector[stuff->data])(client);
    return BadRequest;
}

static int
SProcScreenSaverQueryVersion (ClientPtr client)
{
    REQUEST(xScreenSaverQueryVersionReq);
    int	    n;

    swaps (&stuff->length, n);
    REQUEST_SIZE_MATCH(xScreenSaverQueryVersionReq);
    return ProcScreenSaverQueryVersion (client);
}

static int
SProcScreenSaverQueryInfo (ClientPtr client)
{
    REQUEST(xScreenSaverQueryInfoReq);
    int	    n;

    swaps (&stuff->length, n);
    REQUEST_SIZE_MATCH(xScreenSaverQueryInfoReq);
    swapl (&stuff->drawable, n);
    return ProcScreenSaverQueryInfo (client);
}

static int
SProcScreenSaverSelectInput (ClientPtr client)
{
    REQUEST(xScreenSaverSelectInputReq);
    int	    n;

    swaps (&stuff->length, n);
    REQUEST_SIZE_MATCH(xScreenSaverSelectInputReq);
    swapl (&stuff->drawable, n);
    swapl (&stuff->eventMask, n);
    return ProcScreenSaverSelectInput (client);
}

static int
SProcScreenSaverSetAttributes (ClientPtr client)
{
    REQUEST(xScreenSaverSetAttributesReq);
    int	    n;

    swaps (&stuff->length, n);
    REQUEST_AT_LEAST_SIZE(xScreenSaverSetAttributesReq);
    swapl (&stuff->drawable, n);
    swaps (&stuff->x, n);
    swaps (&stuff->y, n);
    swaps (&stuff->width, n);
    swaps (&stuff->height, n);
    swaps (&stuff->borderWidth, n);
    swapl (&stuff->visualID, n);
    swapl (&stuff->mask, n);
    SwapRestL(stuff);
    return ProcScreenSaverSetAttributes (client);
}

static int
SProcScreenSaverUnsetAttributes (ClientPtr client)
{
    REQUEST(xScreenSaverUnsetAttributesReq);
    int	    n;

    swaps (&stuff->length, n);
    REQUEST_SIZE_MATCH(xScreenSaverUnsetAttributesReq);
    swapl (&stuff->drawable, n);
    return ProcScreenSaverUnsetAttributes (client);
}

static int
SProcScreenSaverSuspend (ClientPtr client)
{
    int n;
    REQUEST(xScreenSaverSuspendReq);

    swaps(&stuff->length, n);
    REQUEST_SIZE_MATCH(xScreenSaverSuspendReq);
    swapl(&stuff->suspend, n);
    return ProcScreenSaverSuspend (client);
}

static int (*SwappedVector[]) (ClientPtr /* client */) = {
    SProcScreenSaverQueryVersion,
    SProcScreenSaverQueryInfo,
    SProcScreenSaverSelectInput,
    SProcScreenSaverSetAttributes,
    SProcScreenSaverUnsetAttributes,
    SProcScreenSaverSuspend,
};

static int
SProcScreenSaverDispatch (ClientPtr client)
{
    REQUEST(xReq);

    if (stuff->data < NUM_REQUESTS)
	return (*SwappedVector[stuff->data])(client);
    return BadRequest;
}

void
ScreenSaverExtensionInit(INITARGS)
{
    ExtensionEntry *extEntry;
    int		    i;
    ScreenPtr	    pScreen;

    if (!dixRegisterPrivateKey(&ScreenPrivateKeyRec, PRIVATE_SCREEN, 0))
	return;

    AttrType = CreateNewResourceType(ScreenSaverFreeAttr, "SaverAttr");
    SaverEventType = CreateNewResourceType(ScreenSaverFreeEvents,
					   "SaverEvent");
    SuspendType = CreateNewResourceType(ScreenSaverFreeSuspend,
					"SaverSuspend");

    for (i = 0; i < screenInfo.numScreens; i++)
    {
	pScreen = screenInfo.screens[i];
	SetScreenPrivate (pScreen, NULL);
    }
    if (AttrType && SaverEventType && SuspendType &&
	(extEntry = AddExtension(ScreenSaverName, ScreenSaverNumberEvents, 0,
				 ProcScreenSaverDispatch, SProcScreenSaverDispatch,
				 NULL, StandardMinorOpcode)))
    {
	ScreenSaverEventBase = extEntry->eventBase;
	EventSwapVector[ScreenSaverEventBase] = (EventSwapPtr) SScreenSaverNotifyEvent;
    }
}