saver.c

远程桌面连接工具

/*
 * $XConsortium: saver.c,v 1.12 94/04/17 20:59:36 dpw Exp $
 * $XFree86: xc/programs/Xserver/Xext/saver.c,v 3.2 1996/06/10 09:11:17 dawes Exp $
 *
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
 */

#define NEED_REPLIES
#define NEED_EVENTS
#include <stdio.h>
#include "X.h"
#include "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 "saverproto.h"
#include "gcstruct.h"
#include "cursorstr.h"
#include "colormapst.h"

static unsigned char ScreenSaverReqCode = 0;
static int ScreenSaverEventBase = 0;

extern DISPATCH_PROC(ProcScreenSaverQueryInfo);
static DISPATCH_PROC(ProcScreenSaverDispatch);
static DISPATCH_PROC(ProcScreenSaverQueryVersion);
static DISPATCH_PROC(ProcScreenSaverSelectInput);
static DISPATCH_PROC(ProcScreenSaverSetAttributes);
static DISPATCH_PROC(ProcScreenSaverUnsetAttributes);
static DISPATCH_PROC(SProcScreenSaverDispatch);
static DISPATCH_PROC(SProcScreenSaverQueryInfo);
static DISPATCH_PROC(SProcScreenSaverQueryVersion);
static DISPATCH_PROC(SProcScreenSaverSelectInput);
static DISPATCH_PROC(SProcScreenSaverSetAttributes);
static DISPATCH_PROC(SProcScreenSaverUnsetAttributes);

static Bool ScreenSaverHandle (
#if NeedFunctionPrototypes
	ScreenPtr /* pScreen */,
	int /* xstate */,
	Bool /* force */
#endif
	);

static Bool
CreateSaverWindow (
#if NeedFunctionPrototypes
	ScreenPtr /* pScreen */
#endif
	);

static Bool
DestroySaverWindow (
#if NeedFunctionPrototypes
	ScreenPtr /* pScreen */
#endif
	);

static void
UninstallSaverColormap (
#if NeedFunctionPrototypes
	ScreenPtr /* pScreen */
#endif
	);

static void
CheckScreenPrivate (
#if NeedFunctionPrototypes
	ScreenPtr /* pScreen */
#endif
	);

static void SScreenSaverNotifyEvent (
#if NeedFunctionPrototypes
	xScreenSaverNotifyEvent * /* from */,
	xScreenSaverNotifyEvent * /* to */
#endif
	);

static void ScreenSaverResetProc (
#if NeedFunctionPrototypes
	ExtensionEntry * /* extEntry */
#endif
	);

extern WindowPtr    *WindowTable;

/*
 * 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 EventType;   /* 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(
#if NeedFunctionPrototypes
    pointer /* value */,
    XID /* id */
#endif
);

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

static unsigned long getEventMask (
#if NeedFunctionPrototypes
    ScreenPtr /* pScreen */,
    ClientPtr /* client */
#endif
);

/*
 * 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 (
#if NeedFunctionPrototypes
    pointer /* value */,
    XID /* id */
#endif
);

static void FreeAttrs (
#if NeedFunctionPrototypes
    ScreenSaverAttrPtr	/* pAttr */
#endif
);

static void FreeScreenAttr (
#if NeedFunctionPrototypes
    ScreenSaverAttrPtr	/* pAttr */
#endif
);

static void
SendScreenSaverNotify (
#if NeedFunctionPrototypes
    ScreenPtr /* pScreen */,
    int /* state */,
    Bool /* forced */
#endif
);

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

static ScreenSaverScreenPrivatePtr
MakeScreenPrivate (
#if NeedFunctionPrototypes
	ScreenPtr /* pScreen */
#endif
	);

static int ScreenPrivateIndex;

#define GetScreenPrivate(s) ((ScreenSaverScreenPrivatePtr)(s)->devPrivates[ScreenPrivateIndex].ptr)
#define SetScreenPrivate(s,v) ((s)->devPrivates[ScreenPrivateIndex].ptr = (pointer) v);
#define SetupScreen(s)	ScreenSaverScreenPrivatePtr pPriv = GetScreenPrivate(s)

#define New(t)	((t *) xalloc (sizeof (t)))

/****************
 * ScreenSaverExtensionInit
 *
 * Called from InitExtensions in main() or from QueryExtension() if the
 * extension is dynamically loaded.
 *
 ****************/

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

    AttrType = CreateNewResourceType(ScreenSaverFreeAttr);
    EventType = CreateNewResourceType(ScreenSaverFreeEvents);
    ScreenPrivateIndex = AllocateScreenPrivateIndex ();
    for (i = 0; i < screenInfo.numScreens; i++)
    {
	pScreen = screenInfo.screens[i];
	SetScreenPrivate (pScreen, NULL);
    }
    if (AttrType && EventType && ScreenPrivateIndex != -1 &&
	(extEntry = AddExtension(ScreenSaverName, ScreenSaverNumberEvents, 0,
				 ProcScreenSaverDispatch, SProcScreenSaverDispatch,
				 ScreenSaverResetProc, StandardMinorOpcode)))
    {
	ScreenSaverReqCode = (unsigned char)extEntry->base;
	ScreenSaverEventBase = extEntry->eventBase;
	EventSwapVector[ScreenSaverEventBase] = (EventSwapPtr) SScreenSaverNotifyEvent;
    }
}

/*ARGSUSED*/
static void
ScreenSaverResetProc (extEntry)
ExtensionEntry	*extEntry;
{
}

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

    if (!pPriv)
	return;
    if (!pPriv->attr && !pPriv->events &&
	!pPriv->hasWindow && pPriv->installedMap == None)
    {
	xfree (pPriv);
	SetScreenPrivate (pScreen, NULL);
	savedScreenInfo[pScreen->myNum].ExternalScreenSaver = NULL;
    }
}

static ScreenSaverScreenPrivatePtr
MakeScreenPrivate (pScreen)
    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);
    savedScreenInfo[pScreen->myNum].ExternalScreenSaver = ScreenSaverHandle;
    return pPriv;
}

static unsigned long
getEventMask (pScreen, client)
    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 (pScreen, client, mask)
    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, EventType);
	*pPrev = pEv->next;
	xfree (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, EventType, (pointer) pEv))
		return FALSE;
    	}
	pEv->mask = mask;
    }
    return TRUE;
}

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

static int
ScreenSaverFreeEvents (value, id)
    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;
    xfree (pEv);
    CheckScreenPrivate (pScreen);
    return TRUE;
}

static int
ScreenSaverFreeAttr (value, id)
    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)
    {
	SaveScreens (SCREEN_SAVER_FORCER, ScreenSaverReset);
	SaveScreens (SCREEN_SAVER_FORCER, ScreenSaverActive);