gc.c

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		    (*pGC->funcs->ChangeClip)(pGC, clipType,
					      (pointer)pPixmap, 0);
		}
		break;
	    }
	    case GCDashOffset:
		NEXTVAL(INT16, pGC->dashOffset);
		break;
	    case GCDashList:
	    {
		CARD8 newdash;
		NEXTVAL(CARD8, newdash);
		if (newdash == 4)
		{
		    if (pGC->dash != DefaultDash)
		    {
			xfree(pGC->dash);
			pGC->numInDashList = 2;
			pGC->dash = DefaultDash;
		    }
		}
		else if (newdash != 0)
 		{
		    unsigned char *dash;

		    dash = (unsigned char *)xalloc(2 * sizeof(unsigned char));
		    if (dash)
		    {
			if (pGC->dash != DefaultDash)
			    xfree(pGC->dash);
			pGC->numInDashList = 2;
			pGC->dash = dash;
			dash[0] = newdash;
			dash[1] = newdash;
		    }
		    else
			error = BadAlloc;
		}
 		else
		{
		   clientErrorValue = newdash;
		   error = BadValue;
		}
		break;
	    }
	    case GCArcMode:
	    {
		unsigned int newarcmode;
		NEXTVAL(unsigned int, newarcmode);
		if (newarcmode <= ArcPieSlice)
		    pGC->arcMode = newarcmode;
		else
		{
		    clientErrorValue = newarcmode;
		    error = BadValue;
		}
		break;
	    }
	    default:
		clientErrorValue = maskQ;
		error = BadValue;
		break;
	}
    } /* end while mask && !error */

    if (pGC->fillStyle == FillTiled && pGC->tileIsPixel)
    {
	if (!CreateDefaultTile (pGC))
	{
	    pGC->fillStyle = FillSolid;
	    error = BadAlloc;
	}
    }
    (*pGC->funcs->ChangeGC)(pGC, maskQ);
    return error;
}

#undef NEXTVAL
#undef NEXT_PTR

/* Publically defined entry to ChangeGC.  Just calls dixChangeGC and tells
 * it that all of the entries are constants or IDs */
int
ChangeGC(pGC, mask, pval)
    register GC 	*pGC;
    register BITS32	mask;
    XID			*pval;
{
    return (dixChangeGC(NullClient, pGC, mask, pval, NULL));
}

/* DoChangeGC(pGC, mask, pval, fPointer)
   mask is a set of bits indicating which values to change.
   pval contains an appropriate value for each mask.
   fPointer is true if the values for tiles, stipples, fonts or clipmasks
   are pointers instead of IDs.  Note: if you are passing pointers you
   MUST declare the array of values as type pointer!  Other data types
   may not be large enough to hold pointers on some machines.  Yes,
   this means you have to cast to (XID *) when you pass the array to
   DoChangeGC.  Similarly, if you are not passing pointers (fPointer = 0) you
   MUST declare the array as type XID (not unsigned long!), or again the wrong
   size data type may be used.  To avoid this cruftiness, use dixChangeGC
   above.

   if there is an error, the value is marked as changed 
   anyway, which is probably wrong, but infrequent.

NOTE:
	all values sent over the protocol for ChangeGC requests are
32 bits long
*/
int
DoChangeGC(pGC, mask, pval, fPointer)
    register GC 	*pGC;
    register BITS32	mask;
    XID			*pval;
    int			fPointer;
{
    int r;

    if (fPointer)
    /* XXX might be a problem on 64 bit big-endian servers */
	r = dixChangeGC(NullClient, pGC, mask, NULL, (ChangeGCValPtr)pval);
    else
	r = dixChangeGC(NullClient, pGC, mask, pval, NULL);

    return r;
}


/* CreateGC(pDrawable, mask, pval, pStatus)
   creates a default GC for the given drawable, using mask to fill
   in any non-default values.
   Returns a pointer to the new GC on success, NULL otherwise.
   returns status of non-default fields in pStatus
BUG:
   should check for failure to create default tile

*/

static GCPtr
#if NeedFunctionPrototypes
AllocateGC(ScreenPtr pScreen)
#else
AllocateGC(pScreen)
    ScreenPtr pScreen;
#endif
{
    GCPtr pGC;
    register char *ptr;
    register DevUnion *ppriv;
    register unsigned *sizes;
    register unsigned size;
    register int i;

    pGC = (GCPtr)xalloc(pScreen->totalGCSize);
    if (pGC)
    {
	ppriv = (DevUnion *)(pGC + 1);
	pGC->devPrivates = ppriv;
	sizes = pScreen->GCPrivateSizes;
	ptr = (char *)(ppriv + pScreen->GCPrivateLen);
	for (i = pScreen->GCPrivateLen; --i >= 0; ppriv++, sizes++)
	{
	    if ( (size = *sizes) )
	    {
		ppriv->ptr = (pointer)ptr;
		ptr += size;
	    }
	    else
		ppriv->ptr = (pointer)NULL;
	}
    }
    return pGC;
}

GCPtr
CreateGC(pDrawable, mask, pval, pStatus)
    DrawablePtr	pDrawable;
    BITS32	mask;
    XID		*pval;
    int		*pStatus;
{
    register GCPtr pGC;

    pGC = AllocateGC(pDrawable->pScreen);
    if (!pGC)
    {
	*pStatus = BadAlloc;
	return (GCPtr)NULL;
    }

    pGC->pScreen = pDrawable->pScreen;
    pGC->depth = pDrawable->depth;
    pGC->alu = GXcopy; /* dst <- src */
    pGC->planemask = ~0;
    pGC->serialNumber = GC_CHANGE_SERIAL_BIT;
    pGC->funcs = 0;

    pGC->fgPixel = 0;
    pGC->bgPixel = 1;
    pGC->lineWidth = 0;
    pGC->lineStyle = LineSolid;
    pGC->capStyle = CapButt;
    pGC->joinStyle = JoinMiter;
    pGC->fillStyle = FillSolid;
    pGC->fillRule = EvenOddRule;
    pGC->arcMode = ArcPieSlice;
    if (mask & GCForeground)
    {
	/*
	 * magic special case -- ChangeGC checks for this condition
	 * and snags the Foreground value to create a pseudo default-tile
	 */
	pGC->tileIsPixel = FALSE;
	pGC->tile.pixmap = NullPixmap;
    }
    else
    {
	pGC->tileIsPixel = TRUE;
	pGC->tile.pixel = 0;
    }

    pGC->patOrg.x = 0;
    pGC->patOrg.y = 0;
    pGC->subWindowMode = ClipByChildren;
    pGC->graphicsExposures = TRUE;
    pGC->clipOrg.x = 0;
    pGC->clipOrg.y = 0;
    pGC->clientClipType = CT_NONE;
    pGC->clientClip = (pointer)NULL;
    pGC->numInDashList = 2;
    pGC->dash = DefaultDash;
    pGC->dashOffset = 0;
    pGC->lastWinOrg.x = 0;
    pGC->lastWinOrg.y = 0;

    /* use the default font and stipple */
    pGC->font = defaultFont;
    defaultFont->refcnt++;
    pGC->stipple = pGC->pScreen->PixmapPerDepth[0];
    pGC->stipple->refcnt++;

    pGC->stateChanges = (1 << (GCLastBit+1)) - 1;
    if (!(*pGC->pScreen->CreateGC)(pGC))
	*pStatus = BadAlloc;
    else if (mask)
        *pStatus = ChangeGC(pGC, mask, pval);
    else
	*pStatus = Success;
    if (*pStatus != Success)
    {
	if (!pGC->tileIsPixel && !pGC->tile.pixmap)
	    pGC->tileIsPixel = TRUE; /* undo special case */
	FreeGC(pGC, (XID)0);
	pGC = (GCPtr)NULL;
    }

    return (pGC);
}

static Bool
CreateDefaultTile (pGC)
    GCPtr   pGC;
{
    XID		tmpval[3];
    PixmapPtr 	pTile;
    GCPtr	pgcScratch;
    xRectangle	rect;
    CARD16	w, h;

    w = 1;
    h = 1;
    (*pGC->pScreen->QueryBestSize)(TileShape, &w, &h, pGC->pScreen);
    pTile = (PixmapPtr)
	    (*pGC->pScreen->CreatePixmap)(pGC->pScreen,
					  w, h, pGC->depth);
    pgcScratch = GetScratchGC(pGC->depth, pGC->pScreen);
    if (!pTile || !pgcScratch)
    {
	if (pTile)
	    (*pTile->drawable.pScreen->DestroyPixmap)(pTile);
	if (pgcScratch)
	    FreeScratchGC(pgcScratch);
	return FALSE;
    }
    tmpval[0] = GXcopy;
    tmpval[1] = pGC->tile.pixel;
    tmpval[2] = FillSolid;
    (void)ChangeGC(pgcScratch, GCFunction | GCForeground | GCFillStyle, 
		   tmpval);
    ValidateGC((DrawablePtr)pTile, pgcScratch);
    rect.x = 0;
    rect.y = 0;
    rect.width = w;
    rect.height = h;
    (*pgcScratch->ops->PolyFillRect)((DrawablePtr)pTile, pgcScratch, 1, &rect);
    /* Always remember to free the scratch graphics context after use. */
    FreeScratchGC(pgcScratch);

    pGC->tileIsPixel = FALSE;
    pGC->tile.pixmap = pTile;
    return TRUE;
}

int
CopyGC(pgcSrc, pgcDst, mask)
    register GC		*pgcSrc;
    register GC		*pgcDst;
    register BITS32	mask;
{
    register BITS32	index2;
    BITS32		maskQ;
    int 		error = 0;

    if (pgcSrc == pgcDst)
	return Success;
    pgcDst->serialNumber |= GC_CHANGE_SERIAL_BIT;
    pgcDst->stateChanges |= mask;
    maskQ = mask;
    while (mask)
    {
	index2 = (BITS32) lowbit (mask);
	mask &= ~index2;
	switch (index2)
	{
	    case GCFunction:
		pgcDst->alu = pgcSrc->alu;
		break;
	    case GCPlaneMask:
		pgcDst->planemask = pgcSrc->planemask;
		break;
	    case GCForeground:
		pgcDst->fgPixel = pgcSrc->fgPixel;
		break;
	    case GCBackground:
		pgcDst->bgPixel = pgcSrc->bgPixel;
		break;
	    case GCLineWidth:
		pgcDst->lineWidth = pgcSrc->lineWidth;
		break;
	    case GCLineStyle:
		pgcDst->lineStyle = pgcSrc->lineStyle;
		break;
	    case GCCapStyle:
		pgcDst->capStyle = pgcSrc->capStyle;
		break;
	    case GCJoinStyle:
		pgcDst->joinStyle = pgcSrc->joinStyle;
		break;
	    case GCFillStyle:
		pgcDst->fillStyle = pgcSrc->fillStyle;
		break;
	    case GCFillRule:
		pgcDst->fillRule = pgcSrc->fillRule;
		break;
	    case GCTile:
		{
		    if (EqualPixUnion(pgcDst->tileIsPixel,
				      pgcDst->tile,
				      pgcSrc->tileIsPixel,
				      pgcSrc->tile))
		    {
			break;
		    }
		    if (!pgcDst->tileIsPixel)
			(* pgcDst->pScreen->DestroyPixmap)(pgcDst->tile.pixmap);
		    pgcDst->tileIsPixel = pgcSrc->tileIsPixel;
		    pgcDst->tile = pgcSrc->tile;
		    if (!pgcDst->tileIsPixel)
		       pgcDst->tile.pixmap->refcnt++;
		    break;
		}
	    case GCStipple:
		{
		    if (pgcDst->stipple == pgcSrc->stipple)
			break;
		    if (pgcDst->stipple)
			(* pgcDst->pScreen->DestroyPixmap)(pgcDst->stipple);
		    pgcDst->stipple = pgcSrc->stipple;
		    if (pgcDst->stipple)
			pgcDst->stipple->refcnt ++;
		    break;
		}
	    case GCTileStipXOrigin:
		pgcDst->patOrg.x = pgcSrc->patOrg.x;
		break;
	    case GCTileStipYOrigin:
		pgcDst->patOrg.y = pgcSrc->patOrg.y;
		break;
	    case GCFont:
		if (pgcDst->font == pgcSrc->font)
		    break;
		if (pgcDst->font)
		    CloseFont(pgcDst->font, (Font)0);
		if ((pgcDst->font = pgcSrc->font) != NullFont)
		    (pgcDst->font)->refcnt++;
		break;
	    case GCSubwindowMode:
		pgcDst->subWindowMode = pgcSrc->subWindowMode;
		break;
	    case GCGraphicsExposures:
		pgcDst->graphicsExposures = pgcSrc->graphicsExposures;
		break;
	    case GCClipXOrigin:
		pgcDst->clipOrg.x = pgcSrc->clipOrg.x;
		break;
	    case GCClipYOrigin:
		pgcDst->clipOrg.y = pgcSrc->clipOrg.y;
		break;
	    case GCClipMask:
		(* pgcDst->funcs->CopyClip)(pgcDst, pgcSrc);
		break;
	    case GCDashOffset:
		pgcDst->dashOffset = pgcSrc->dashOffset;
		break;
	    case GCDashList:
		if (pgcSrc->dash == DefaultDash)
		{
		    if (pgcDst->dash != DefaultDash)
		    {
			xfree(pgcDst->dash);
			pgcDst->numInDashList = pgcSrc->numInDashList;
			pgcDst->dash = pgcSrc->dash;
		    }
		}
		else
		{
		    unsigned char *dash;
		    unsigned int i;

		    dash = (unsigned char *)xalloc(pgcSrc->numInDashList *
						   sizeof(unsigned char));
		    if (dash)
		    {
			if (pgcDst->dash != DefaultDash)
			    xfree(pgcDst->dash);
			pgcDst->numInDashList = pgcSrc->numInDashList;
			pgcDst->dash = dash;
			for (i=0; i<pgcSrc->numInDashList; i++)
			    dash[i] = pgcSrc->dash[i];
		    }
		    else
			error = BadAlloc;
		}
		break;
	    case GCArcMode: