window.c

远程桌面连接工具

/* $XConsortium: window.c /main/210 1996/10/28 07:24:59 kaleb $ */
/* $XFree86: xc/programs/Xserver/dix/window.c,v 3.6 1997/01/18 06:53:16 dawes Exp $ */
/*

Copyright (c) 1987  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.


Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts,

			All Rights Reserved

Permission to use, copy, modify, and distribute this software and its 
documentation for any purpose and without fee is hereby granted, 
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in 
supporting documentation, and that the name of Digital not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.  

DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
SOFTWARE.

*/

#include "misc.h"
#include "scrnintstr.h"
#include "os.h"
#include "regionstr.h"
#include "validate.h"
#include "windowstr.h"
#include "input.h"
#include "resource.h"
#include "colormapst.h"
#include "cursorstr.h"
#include "dixstruct.h"
#include "gcstruct.h"
#include "servermd.h"
#include "dixevents.h"
#ifdef XAPPGROUP
#include "extensions/Xagsrv.h"
#endif
#ifdef XCSECURITY
#define _SECURITY_SERVER
#include "extensions/security.h"
#endif

extern Bool permitOldBugs;

#if defined(NEED_SCREEN_REGIONS)
#define REGION_PTR(pScreen,pWin) \
    register ScreenPtr pScreen = pWin->drawable.pScreen;
#else
#define REGION_PTR(pScreen,pWin) /* nothing */
#endif

/******
 * Window stuff for server 
 *
 *    CreateRootWindow, CreateWindow, ChangeWindowAttributes,
 *    GetWindowAttributes, DeleteWindow, DestroySubWindows,
 *    HandleSaveSet, ReparentWindow, MapWindow, MapSubWindows,
 *    UnmapWindow, UnmapSubWindows, ConfigureWindow, CirculateWindow,
 *
 ******/

static unsigned char _back_lsb[4] = {0x88, 0x22, 0x44, 0x11};
static unsigned char _back_msb[4] = {0x11, 0x44, 0x22, 0x88};

int screenIsSaved = SCREEN_SAVER_OFF;

ScreenSaverStuffRec savedScreenInfo[MAXSCREENS];

extern WindowPtr *WindowTable;

extern int rand();

static Bool TileScreenSaver(
#if NeedFunctionPrototypes
    int /*i*/,
    int /*kind*/
#endif
);


#define INPUTONLY_LEGAL_MASK (CWWinGravity | CWEventMask | \
			      CWDontPropagate | CWOverrideRedirect | CWCursor )

#define BOXES_OVERLAP(b1, b2) \
      (!( ((b1)->x2 <= (b2)->x1)  || \
	( ((b1)->x1 >= (b2)->x2)) || \
	( ((b1)->y2 <= (b2)->y1)) || \
	( ((b1)->y1 >= (b2)->y2)) ) )

#define RedirectSend(pWin) \
    ((pWin->eventMask|wOtherEventMasks(pWin)) & SubstructureRedirectMask)

#define SubSend(pWin) \
    ((pWin->eventMask|wOtherEventMasks(pWin)) & SubstructureNotifyMask)

#define StrSend(pWin) \
    ((pWin->eventMask|wOtherEventMasks(pWin)) & StructureNotifyMask)

#define SubStrSend(pWin,pParent) (StrSend(pWin) || SubSend(pParent))


int numSaveUndersViewable = 0;
int deltaSaveUndersViewable = 0;

#ifdef DEBUG
/******
 * PrintWindowTree
 *    For debugging only
 ******/

int
PrintChildren(p1, indent)
    WindowPtr p1;
    int indent;
{
    WindowPtr p2;
    int i;

    while (p1)
    {
	p2 = p1->firstChild;
	for (i=0; i<indent; i++) ErrorF( " ");
	ErrorF( "%x\n", p1->drawable.id);
	miPrintRegion(&p1->clipList);
	PrintChildren(p2, indent+4);
	p1 = p1->nextSib;
    }
}

PrintWindowTree()
{
    int i;
    WindowPtr pWin, p1;

    for (i=0; i<screenInfo.numScreens; i++)
    {
	ErrorF( "WINDOW %d\n", i);
	pWin = WindowTable[i];
	miPrintRegion(&pWin->clipList);
	p1 = pWin->firstChild;
	PrintChildren(p1, 4);
    }
}
#endif

int
TraverseTree(pWin, func, data)
    register WindowPtr pWin;
    VisitWindowProcPtr func;
    pointer data;
{
    register int result;
    register WindowPtr pChild;

    if (!(pChild = pWin))
       return(WT_NOMATCH);
    while (1)
    {
	result = (* func)(pChild, data);
	if (result == WT_STOPWALKING)
	    return(WT_STOPWALKING);
	if ((result == WT_WALKCHILDREN) && pChild->firstChild)
	{
	    pChild = pChild->firstChild;
	    continue;
	}
	while (!pChild->nextSib && (pChild != pWin))
	    pChild = pChild->parent;
	if (pChild == pWin)
	    break;
	pChild = pChild->nextSib;
    }
    return(WT_NOMATCH);
}

/*****
 * WalkTree
 *   Walk the window tree, for SCREEN, preforming FUNC(pWin, data) on
 *   each window.  If FUNC returns WT_WALKCHILDREN, traverse the children,
 *   if it returns WT_DONTWALKCHILDREN, dont.  If it returns WT_STOPWALKING
 *   exit WalkTree.  Does depth-first traverse.
 *****/

int
WalkTree(pScreen, func, data)
    ScreenPtr pScreen;
    VisitWindowProcPtr func;
    pointer data;
{
    return(TraverseTree(WindowTable[pScreen->myNum], func, data));
}

/* hack for forcing backing store on all windows */
int	defaultBackingStore = NotUseful;
/* hack to force no backing store */
Bool	disableBackingStore = FALSE;
/* hack to force no save unders */
Bool	disableSaveUnders = FALSE;

static void
#if NeedFunctionPrototypes
SetWindowToDefaults(register WindowPtr pWin)
#else
SetWindowToDefaults(pWin)
    register WindowPtr pWin;
#endif
{
    pWin->prevSib = NullWindow;
    pWin->firstChild = NullWindow;
    pWin->lastChild = NullWindow;

    pWin->valdata = (ValidatePtr)NULL;
    pWin->optional = (WindowOptPtr)NULL;
    pWin->cursorIsNone = TRUE;

    pWin->backingStore = NotUseful;
    pWin->DIXsaveUnder = FALSE;
    pWin->backStorage = (pointer) NULL;

    pWin->mapped = FALSE;	    /* off */
    pWin->realized = FALSE;	/* off */
    pWin->viewable = FALSE;
    pWin->visibility = VisibilityNotViewable;
    pWin->overrideRedirect = FALSE;
    pWin->saveUnder = FALSE;

    pWin->bitGravity = ForgetGravity;
    pWin->winGravity = NorthWestGravity;

    pWin->eventMask = 0;
    pWin->deliverableEvents = 0;
    pWin->dontPropagate = 0;
    pWin->forcedBS = FALSE;
#ifdef NEED_DBE_BUF_BITS
    pWin->srcBuffer = DBE_FRONT_BUFFER;
    pWin->dstBuffer = DBE_FRONT_BUFFER;
#endif
}

static void
#if NeedFunctionPrototypes
MakeRootTile(WindowPtr pWin)
#else
MakeRootTile(pWin)
    WindowPtr pWin;
#endif
{
    ScreenPtr pScreen = pWin->drawable.pScreen;
    GCPtr pGC;
    unsigned char back[128];
    int len = BitmapBytePad(4);
    register unsigned char *from, *to;
    register int i, j;

    pWin->background.pixmap = (*pScreen->CreatePixmap)(pScreen, 4, 4,
						    pScreen->rootDepth);

    pWin->backgroundState = BackgroundPixmap;
    pGC = GetScratchGC(pScreen->rootDepth, pScreen);
    if (!pWin->background.pixmap || !pGC)
	FatalError("cound not create root tile");

    {
	CARD32 attributes[2];

	attributes[0] = pScreen->whitePixel;
	attributes[1] = pScreen->blackPixel;

	(void)ChangeGC(pGC, GCForeground | GCBackground, attributes);
    }

   ValidateGC((DrawablePtr)pWin->background.pixmap, pGC);

   from = (screenInfo.bitmapBitOrder == LSBFirst) ? _back_lsb : _back_msb;
   to = back;

   for (i = 4; i > 0; i--, from++)
	for (j = len; j > 0; j--)
	    *to++ = *from;

   (*pGC->ops->PutImage)((DrawablePtr)pWin->background.pixmap, pGC, 1,
		    0, 0, 4, 4, 0, XYBitmap, (char *)back);

   FreeScratchGC(pGC);

}

WindowPtr
AllocateWindow(pScreen)
    ScreenPtr pScreen;
{
    WindowPtr pWin;
    register char *ptr;
    register DevUnion *ppriv;
    register unsigned *sizes;
    register unsigned size;
    register int i;

    pWin = (WindowPtr)xalloc(pScreen->totalWindowSize);
    if (pWin)
    {
	ppriv = (DevUnion *)(pWin + 1);
	pWin->devPrivates = ppriv;
	sizes = pScreen->WindowPrivateSizes;
	ptr = (char *)(ppriv + pScreen->WindowPrivateLen);
	for (i = pScreen->WindowPrivateLen; --i >= 0; ppriv++, sizes++)
	{
	    if ( (size = *sizes) )
	    {
		ppriv->ptr = (pointer)ptr;
		ptr += size;
	    }
	    else
		ppriv->ptr = (pointer)NULL;
	}
    }
    return pWin;
}

/*****
 * CreateRootWindow
 *    Makes a window at initialization time for specified screen
 *****/

Bool
CreateRootWindow(pScreen)
    ScreenPtr	pScreen;
{
    WindowPtr	pWin;
    BoxRec	box;
    PixmapFormatRec *format;

    pWin = AllocateWindow(pScreen);
    if (!pWin)
	return FALSE;

    savedScreenInfo[pScreen->myNum].pWindow = NULL;
    savedScreenInfo[pScreen->myNum].wid = FakeClientID(0);
    savedScreenInfo[pScreen->myNum].ExternalScreenSaver = NULL;
    screenIsSaved = SCREEN_SAVER_OFF;

    WindowTable[pScreen->myNum] = pWin;

    pWin->drawable.pScreen = pScreen;
    pWin->drawable.type = DRAWABLE_WINDOW;

    pWin->drawable.depth = pScreen->rootDepth;
    for (format = screenInfo.formats;
	 format->depth != pScreen->rootDepth;
	 format++)
	;
    pWin->drawable.bitsPerPixel = format->bitsPerPixel;

    pWin->drawable.serialNumber = NEXT_SERIAL_NUMBER;

    pWin->parent = NullWindow;
    SetWindowToDefaults(pWin);

    pWin->optional = (WindowOptRec *) xalloc (sizeof (WindowOptRec));

    pWin->optional->dontPropagateMask = 0;
    pWin->optional->otherEventMasks = 0;
    pWin->optional->otherClients = NULL;
    pWin->optional->passiveGrabs = NULL;
    pWin->optional->userProps = NULL;
    pWin->optional->backingBitPlanes = ~0L;
    pWin->optional->backingPixel = 0;
#ifdef SHAPE
    pWin->optional->boundingShape = NULL;
    pWin->optional->clipShape = NULL;
#endif
#ifdef XINPUT
    pWin->optional->inputMasks = NULL;
#endif
    pWin->optional->colormap = pScreen->defColormap;
    pWin->optional->visual = pScreen->rootVisual;

    pWin->nextSib = NullWindow;

    pWin->drawable.id = FakeClientID(0);

    pWin->origin.x = pWin->origin.y = 0;
    pWin->drawable.height = pScreen->height;
    pWin->drawable.width = pScreen->width;
    pWin->drawable.x = pWin->drawable.y = 0;

    box.x1 = 0;
    box.y1 = 0;
    box.x2 = pScreen->width;
    box.y2 = pScreen->height;
    REGION_INIT(pScreen, &pWin->clipList, &box, 1);
    REGION_INIT(pScreen, &pWin->winSize, &box, 1);
    REGION_INIT(pScreen, &pWin->borderSize, &box, 1);
    REGION_INIT(pScreen, &pWin->borderClip, &box, 1);

    pWin->drawable.class = InputOutput;
    pWin->optional->visual = pScreen->rootVisual;

    pWin->backgroundState = BackgroundPixel;
    pWin->background.pixel = pScreen->whitePixel;

    pWin->borderIsPixel = TRUE;
    pWin->border.pixel = pScreen->blackPixel;
    pWin->borderWidth = 0;

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

    if (disableBackingStore)
	pScreen->backingStoreSupport = NotUseful;

#ifdef DO_SAVE_UNDERS
    if ((pScreen->backingStoreSupport != NotUseful) &&
	(pScreen->saveUnderSupport == NotUseful))
    {
	/*
	 * If the screen has backing-store but no save-unders, let the
	 * clients know we can support save-unders using backing-store.
	 */
	pScreen->saveUnderSupport = USE_DIX_SAVE_UNDERS;
    }
#endif /* DO_SAVE_UNDERS */
		
    if (disableSaveUnders)
	pScreen->saveUnderSupport = NotUseful;

    return TRUE;
}

void
InitRootWindow(pWin)
    WindowPtr pWin;
{
    ScreenPtr pScreen;

    pScreen = pWin->drawable.pScreen;
    if (!(*pScreen->CreateWindow)(pWin))
	return; /* XXX */
    (*pScreen->PositionWindow)(pWin, 0, 0);

    pWin->cursorIsNone = FALSE;
    pWin->optional->cursor = rootCursor;
    rootCursor->refcnt++;
    MakeRootTile(pWin);
    pWin->backingStore = defaultBackingStore;
    pWin->forcedBS = (defaultBackingStore != NotUseful);
    /* We SHOULD check for an error value here XXX */
    (*pScreen->ChangeWindowAttributes)(pWin,
		       CWBackPixmap|CWBorderPixel|CWCursor|CWBackingStore);

    MapWindow(pWin, serverClient);
}

/* Set the region to the intersection of the rectangle and the
 * window's winSize.  The window is typically the parent of the
 * window from which the region came.
 */

void
ClippedRegionFromBox(pWin, Rgn, x, y, w, h)
    register WindowPtr pWin;
    RegionPtr Rgn;
    register int x, y;
    int w, h;
{
    REGION_PTR(pScreen, pWin)
    BoxRec box;

    box = *(REGION_EXTENTS(pScreen, &pWin->winSize));
    /* we do these calculations to avoid overflows */
    if (x > box.x1)
	box.x1 = x;
    if (y > box.y1)
	box.y1 = y;
    x += w;
    if (x < box.x2)
	box.x2 = x;
    y += h;
    if (y < box.y2)
	box.y2 = y;
    if (box.x1 > box.x2)
	box.x2 = box.x1;
    if (box.y1 > box.y2)
	box.y2 = box.y1;
    REGION_RESET(pScreen, Rgn, &box);