gc.c

远程桌面连接工具

/***********************************************************

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,
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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.

******************************************************************/

/* $XConsortium: gc.c /main/70 1996/08/01 19:21:09 dpw $ */
/* $XFree86: xc/programs/Xserver/dix/gc.c,v 3.4 1996/12/23 06:29:45 dawes Exp $ */

#include "X.h"
#include "Xmd.h"
#include "Xproto.h"
#include "misc.h"
#include "resource.h"
#include "gcstruct.h"
#include "pixmapstr.h"
#include "dixfontstr.h"
#include "scrnintstr.h"
#include "region.h"

#include "dix.h"
#include <assert.h>

extern XID clientErrorValue;
extern FontPtr defaultFont;

static Bool CreateDefaultTile(
#if NeedFunctionPrototypes
    GCPtr /*pGC*/
#endif
);

unsigned char DefaultDash[2] = {4, 4};

void
ValidateGC(pDraw, pGC)
    DrawablePtr	pDraw;
    GC		*pGC;
{
    (*pGC->funcs->ValidateGC) (pGC, pGC->stateChanges, pDraw);
    pGC->stateChanges = 0;
    pGC->serialNumber = pDraw->serialNumber;
}


/* dixChangeGC(client, pGC, mask, pC32, pUnion)
 * 
 * This function was created as part of the Security extension
 * implementation.  The client performing the gc change must be passed so
 * that access checks can be performed on any tiles, stipples, or fonts
 * that are specified.  ddxen can call this too; they should normally
 * pass NullClient for the client since any access checking should have
 * already been done at a higher level.
 * 
 * Since we had to create a new function anyway, we decided to change the
 * way the list of gc values is passed to eliminate the compiler warnings
 * caused by the DoChangeGC interface.  You can pass the values via pC32
 * or pUnion, but not both; one of them must be NULL.  If you don't need
 * to pass any pointers, you can use either one:
 * 
 *     /* example calling dixChangeGC using pC32 parameter
 *     CARD32 v[2];
 *     v[0] = foreground;
 *     v[1] = background;
 *     dixChangeGC(client, pGC, GCForeground|GCBackground, v, NULL);
 * 
 *     /* example calling dixChangeGC using pUnion parameter;
 *     /* same effect as above
 *     ChangeGCVal v[2];
 *     v[0].val = foreground;
 *     v[1].val = background;
 *     dixChangeGC(client, pGC, GCForeground|GCBackground, NULL, v);
 * 
 * However, if you need to pass a pointer to a pixmap or font, you MUST
 * use the pUnion parameter.
 * 
 *     /* example calling dixChangeGC passing pointers in the value list
 *     ChangeGCVal v[2];
 *     v[0].val = FillTiled;
 *     v[1].ptr = pPixmap; /* pointer to a pixmap
 *     dixChangeGC(client, pGC, GCFillStyle|GCTile, NULL, v);
 * 
 * Note: we could have gotten by with just the pUnion parameter, but on
 * 64 bit machines that would have forced us to copy the value list that
 * comes in the ChangeGC request.
 * 
 * Ideally, we'd change all the DoChangeGC calls to dixChangeGC, but this
 * is far too many changes to consider at this time, so we've only
 * changed the ones that caused compiler warnings.  New code should use
 * dixChangeGC.
 * 
 * dpw
 */

#define NEXTVAL(_type, _var) { \
      if (pC32) _var = (_type)*pC32++; \
      else { \
	_var = (_type)(pUnion->val); pUnion++; \
      } \
    }

#define NEXT_PTR(_type, _var) { \
    assert(pUnion); _var = (_type)pUnion->ptr; pUnion++; }

int
dixChangeGC(client, pGC, mask, pC32, pUnion)
    ClientPtr client;
    register GC 	*pGC;
    register BITS32	mask;
    CARD32		*pC32;
    ChangeGCValPtr	pUnion;
{
    register BITS32 	index2;
    register int 	error = 0;
    PixmapPtr 		pPixmap;
    BITS32		maskQ;

    assert( (pC32 && !pUnion) || (!pC32 && pUnion) );
    pGC->serialNumber |= GC_CHANGE_SERIAL_BIT;

    maskQ = mask;	/* save these for when we walk the GCque */
    while (mask && !error) 
    {
	index2 = (BITS32) lowbit (mask);
	mask &= ~index2;
	pGC->stateChanges |= index2;
	switch (index2)
	{
	    case GCFunction:
	    {
		CARD8 newalu;
		NEXTVAL(CARD8, newalu);
		if (newalu <= GXset)
		    pGC->alu = newalu;
		else
		{
		    clientErrorValue = newalu;
		    error = BadValue;
		}
		break;
	    }
	    case GCPlaneMask:
		NEXTVAL(unsigned long, pGC->planemask);
		break;
	    case GCForeground:
		NEXTVAL(unsigned long, pGC->fgPixel);
		/*
		 * this is for CreateGC
		 */
		if (!pGC->tileIsPixel && !pGC->tile.pixmap)
		{
		    pGC->tileIsPixel = TRUE;
		    pGC->tile.pixel = pGC->fgPixel;
		}
		break;
	    case GCBackground:
		NEXTVAL(unsigned long, pGC->bgPixel);
		break;
	    case GCLineWidth:		/* ??? line width is a CARD16 */
		 NEXTVAL(CARD16, pGC->lineWidth);
		break;
	    case GCLineStyle:
	    {
		unsigned int newlinestyle;
		NEXTVAL(unsigned int, newlinestyle);
		if (newlinestyle <= LineDoubleDash)
		    pGC->lineStyle = newlinestyle;
		else
		{
		    clientErrorValue = newlinestyle;
		    error = BadValue;
		}
		break;
	    }
	    case GCCapStyle:
	    {
		unsigned int newcapstyle;
		NEXTVAL(unsigned int, newcapstyle);
		if (newcapstyle <= CapProjecting)
		    pGC->capStyle = newcapstyle;
		else
		{
		    clientErrorValue = newcapstyle;
		    error = BadValue;
		}
		break;
	    }
	    case GCJoinStyle:
	    {
		unsigned int newjoinstyle;
		NEXTVAL(unsigned int, newjoinstyle);
		if (newjoinstyle <= JoinBevel)
		    pGC->joinStyle = newjoinstyle;
		else
		{
		    clientErrorValue = newjoinstyle;
		    error = BadValue;
		}
		break;
	    }
	    case GCFillStyle:
	    {
		unsigned int newfillstyle;
		NEXTVAL(unsigned int, newfillstyle);
		if (newfillstyle <= FillOpaqueStippled)
		    pGC->fillStyle = newfillstyle;
		else
		{
		    clientErrorValue = newfillstyle;
		    error = BadValue;
		}
		break;
	    }
	    case GCFillRule:
	    {
		unsigned int newfillrule;
		NEXTVAL(unsigned int, newfillrule);
		if (newfillrule <= WindingRule)
		    pGC->fillRule = newfillrule;
		else
		{
		    clientErrorValue = newfillrule;
		    error = BadValue;
		}
		break;
	    }
	    case GCTile:
	    {
		XID newpix = 0;
		if (pUnion)
		{
		    NEXT_PTR(PixmapPtr, pPixmap);
		}
		else
		{
		    NEXTVAL(XID, newpix);
		    pPixmap = (PixmapPtr)SecurityLookupIDByType(client,
					newpix, RT_PIXMAP, SecurityReadAccess);
		}
		if (pPixmap)
		{
		    if ((pPixmap->drawable.depth != pGC->depth) ||
			(pPixmap->drawable.pScreen != pGC->pScreen))
		    {
			error = BadMatch;
		    }
		    else
		    {
			pPixmap->refcnt++;
			if (!pGC->tileIsPixel)
			    (* pGC->pScreen->DestroyPixmap)(pGC->tile.pixmap);
			pGC->tileIsPixel = FALSE;
			pGC->tile.pixmap = pPixmap;
		    }
		}
		else
		{
		    clientErrorValue = newpix;
		    error = BadPixmap;
		}
		break;
	    }
	    case GCStipple:
	    {
		XID newstipple = 0;
		if (pUnion)
		{
		    NEXT_PTR(PixmapPtr, pPixmap);
		}
		else
		{
		    NEXTVAL(XID, newstipple)
		    pPixmap = (PixmapPtr)SecurityLookupIDByType(client,
				newstipple, RT_PIXMAP, SecurityReadAccess);
		}
		if (pPixmap)
		{
		    if ((pPixmap->drawable.depth != 1) ||
			(pPixmap->drawable.pScreen != pGC->pScreen))
		    {
			error = BadMatch;
		    }
		    else
		    {
			pPixmap->refcnt++;
			if (pGC->stipple)
			    (* pGC->pScreen->DestroyPixmap)(pGC->stipple);
			pGC->stipple = pPixmap;
		    }
		}
		else
		{
		    clientErrorValue = newstipple;
		    error = BadPixmap;
		}
		break;
	    }
	    case GCTileStipXOrigin:
		NEXTVAL(INT16, pGC->patOrg.x);
		break;
	    case GCTileStipYOrigin:
		NEXTVAL(INT16, pGC->patOrg.y);
		break;
	    case GCFont:
    	    {
		FontPtr	pFont;
		XID newfont = 0;
		if (pUnion)
		{
		    NEXT_PTR(FontPtr, pFont);
		}
		else
		{
		    NEXTVAL(XID, newfont)
		    pFont = (FontPtr)SecurityLookupIDByType(client, newfont,
						RT_FONT, SecurityReadAccess);
		}
		if (pFont)
		{
		    pFont->refcnt++;
		    if (pGC->font)
    		        CloseFont(pGC->font, (Font)0);
		    pGC->font = pFont;
		 }
		else
		{
		    clientErrorValue = newfont;
		    error = BadFont;
		}
		break;
	    }
	    case GCSubwindowMode:
	    {
		unsigned int newclipmode;
		NEXTVAL(unsigned int, newclipmode);
		if (newclipmode <= IncludeInferiors)
		    pGC->subWindowMode = newclipmode;
		else
		{
		    clientErrorValue = newclipmode;
		    error = BadValue;
		}
		break;
	    }
	    case GCGraphicsExposures:
    	    {
		unsigned int newge;
		NEXTVAL(unsigned int, newge);
		if (newge <= xTrue)
		    pGC->graphicsExposures = newge;
		else
		{
		    clientErrorValue = newge;
		    error = BadValue;
		}
		break;
	    }
	    case GCClipXOrigin:
		NEXTVAL(INT16, pGC->clipOrg.x);
		break;
	    case GCClipYOrigin:
		NEXTVAL(INT16, pGC->clipOrg.y);
		break;
	    case GCClipMask:
	    {
		Pixmap pid;
		int    clipType;

		if (pUnion)
		{
		    NEXT_PTR(PixmapPtr, pPixmap);
		}
		else
		{
		    NEXTVAL(Pixmap, pid)
		    if (pid == None)
		    {
			clipType = CT_NONE;
			pPixmap = NullPixmap;
		    }
		    else
		        pPixmap = (PixmapPtr)SecurityLookupIDByType(client,
					pid, RT_PIXMAP, SecurityReadAccess);
		}

		if (pPixmap)
		{
		    if ((pPixmap->drawable.depth != 1) ||
			(pPixmap->drawable.pScreen != pGC->pScreen))
		    {
			error = BadMatch;
		    }
		    else
		    {
			clipType = CT_PIXMAP;
			pPixmap->refcnt++;
		    }
		}
		else if (!pUnion && (pid != None))
		{
		    clientErrorValue = pid;
		    error = BadPixmap;
		}
		if(error == Success)
		{