gc.c

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		pgcDst->arcMode = pgcSrc->arcMode;
		break;
	    default:
		clientErrorValue = maskQ;
		error = BadValue;
		break;
	}
    }
    if (pgcDst->fillStyle == FillTiled && pgcDst->tileIsPixel)
    {
	if (!CreateDefaultTile (pgcDst))
	{
	    pgcDst->fillStyle = FillSolid;
	    error = BadAlloc;
	}
    }
    (*pgcDst->funcs->CopyGC) (pgcSrc, maskQ, pgcDst);
    return error;
}

/*****************
 * FreeGC 
 *   does the diX part of freeing the characteristics in the GC 
 ***************/

/*ARGSUSED*/
int
FreeGC(value, gid)
    pointer value; /* must conform to DeleteType */
    XID gid;
{
    GCPtr pGC = (GCPtr)value;

    CloseFont(pGC->font, (Font)0);
    (* pGC->funcs->DestroyClip)(pGC);

    if (!pGC->tileIsPixel)
	(* pGC->pScreen->DestroyPixmap)(pGC->tile.pixmap);
    if (pGC->stipple)
	(* pGC->pScreen->DestroyPixmap)(pGC->stipple);

    (*pGC->funcs->DestroyGC) (pGC);
    if (pGC->dash != DefaultDash)
	xfree(pGC->dash);
    xfree(pGC);
    return(Success);
}

void
SetGCMask(pGC, selectMask, newDataMask)
    GCPtr pGC;
    Mask selectMask;
    Mask newDataMask;
{
    pGC->stateChanges = (~selectMask & pGC->stateChanges) |
		        (selectMask & newDataMask);
    if (selectMask & newDataMask)
        pGC->serialNumber |= GC_CHANGE_SERIAL_BIT;        
}



/* CreateScratchGC(pScreen, depth)
    like CreateGC, but doesn't do the default tile or stipple,
since we can't create them without already having a GC.  any code
using the tile or stipple has to set them explicitly anyway,
since the state of the scratch gc is unknown.  This is OK
because ChangeGC() has to be able to deal with NULL tiles and
stipples anyway (in case the CreateGC() call has provided a 
value for them -- we can't set the default tile until the
client-supplied attributes are installed, since the fgPixel
is what fills the default tile.  (maybe this comment should
go with CreateGC() or ChangeGC().)
*/

GCPtr
CreateScratchGC(pScreen, depth)
    ScreenPtr pScreen;
    unsigned depth;
{
    register GCPtr pGC;

    pGC = AllocateGC(pScreen);
    if (!pGC)
	return (GCPtr)NULL;

    pGC->pScreen = pScreen;
    pGC->depth = depth;
    pGC->alu = GXcopy; /* dst <- src */
    pGC->planemask = ~0;
    pGC->serialNumber = 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;
    pGC->font = defaultFont;
    if ( pGC->font)  /* necessary, because open of default font could fail */
	pGC->font->refcnt++;
    pGC->tileIsPixel = TRUE;
    pGC->tile.pixel = 0;
    pGC->stipple = NullPixmap;
    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->dashOffset = 0;
    pGC->numInDashList = 2;
    pGC->dash = DefaultDash;
    pGC->lastWinOrg.x = 0;
    pGC->lastWinOrg.y = 0;

    pGC->stateChanges = (1 << (GCLastBit+1)) - 1;
    if (!(*pScreen->CreateGC)(pGC))
    {
	FreeGC(pGC, (XID)0);
	pGC = (GCPtr)NULL;
    }
    return pGC;
}

void
FreeGCperDepth(screenNum)
    int screenNum;
{
    register int i;
    register ScreenPtr pScreen;
    GCPtr *ppGC;

    pScreen = screenInfo.screens[screenNum];
    ppGC = pScreen->GCperDepth;

    for (i = 0; i <= pScreen->numDepths; i++)
	(void)FreeGC(ppGC[i], (XID)0);
    pScreen->rgf = ~0L;
}


Bool
CreateGCperDepth(screenNum)
    int screenNum;
{
    register int i;
    register ScreenPtr pScreen;
    DepthPtr pDepth;
    GCPtr *ppGC;

    pScreen = screenInfo.screens[screenNum];
    pScreen->rgf = 0;
    ppGC = pScreen->GCperDepth;
    /* do depth 1 separately because it's not included in list */
    if (!(ppGC[0] = CreateScratchGC(pScreen, 1)))
	return FALSE;
    ppGC[0]->graphicsExposures = FALSE;

    pDepth = pScreen->allowedDepths;
    for (i=0; i<pScreen->numDepths; i++, pDepth++)
    {
	if (!(ppGC[i+1] = CreateScratchGC(pScreen, pDepth->depth)))
	{
	    for (; i >= 0; i--)
		(void)FreeGC(ppGC[i], (XID)0);
	    return FALSE;
	}
	ppGC[i+1]->graphicsExposures = FALSE;
    }
    return TRUE;
}

Bool
CreateDefaultStipple(screenNum)
    int screenNum;
{
    register ScreenPtr pScreen;
    XID tmpval[3];
    xRectangle rect;
    CARD16 w, h;
    GCPtr pgcScratch;

    pScreen = screenInfo.screens[screenNum];

    w = 16;
    h = 16;
    (* pScreen->QueryBestSize)(StippleShape, &w, &h, pScreen);
    if (!(pScreen->PixmapPerDepth[0] =
			(*pScreen->CreatePixmap)(pScreen, w, h, 1)))
	return FALSE;
    /* fill stipple with 1 */
    tmpval[0] = GXcopy; tmpval[1] = 1; tmpval[2] = FillSolid;
    pgcScratch = GetScratchGC(1, pScreen);
    if (!pgcScratch)
    {
	(*pScreen->DestroyPixmap)(pScreen->PixmapPerDepth[0]);
	return FALSE;
    }
    (void)ChangeGC(pgcScratch, GCFunction|GCForeground|GCFillStyle, tmpval);
    ValidateGC((DrawablePtr)pScreen->PixmapPerDepth[0], pgcScratch);
    rect.x = 0;
    rect.y = 0;
    rect.width = w;
    rect.height = h;
    (*pgcScratch->ops->PolyFillRect)((DrawablePtr)pScreen->PixmapPerDepth[0], 
				     pgcScratch, 1, &rect);
    FreeScratchGC(pgcScratch);
    return TRUE;
}

void
FreeDefaultStipple(screenNum)
    int screenNum;
{
    ScreenPtr pScreen = screenInfo.screens[screenNum];
    (*pScreen->DestroyPixmap)(pScreen->PixmapPerDepth[0]);
}

int
SetDashes(pGC, offset, ndash, pdash)
register GCPtr pGC;
unsigned offset;
register unsigned ndash;
register unsigned char *pdash;
{
    register long i;
    register unsigned char *p, *indash;
    BITS32 maskQ = 0;

    i = ndash;
    p = pdash;
    while (i--)
    {
	if (!*p++)
	{
	    /* dash segment must be > 0 */
	    clientErrorValue = 0;
	    return BadValue;
	}
    }

    if (ndash & 1)
	p = (unsigned char *)xalloc(2 * ndash * sizeof(unsigned char));
    else
	p = (unsigned char *)xalloc(ndash * sizeof(unsigned char));
    if (!p)
	return BadAlloc;

    pGC->serialNumber |= GC_CHANGE_SERIAL_BIT;
    if (offset != pGC->dashOffset)
    {
	pGC->dashOffset = offset;
	pGC->stateChanges |= GCDashOffset;
	maskQ |= GCDashOffset;
    }

    if (pGC->dash != DefaultDash)
	xfree(pGC->dash);
    pGC->numInDashList = ndash;
    pGC->dash = p;
    if (ndash & 1)
    {
	pGC->numInDashList += ndash;
	indash = pdash;
	i = ndash;
	while (i--)
	    *p++ = *indash++;
    }
    while(ndash--)
	*p++ = *pdash++;
    pGC->stateChanges |= GCDashList;
    maskQ |= GCDashList;

    if (pGC->funcs->ChangeGC)
	(*pGC->funcs->ChangeGC) (pGC, maskQ);
    return Success;
}

int
VerifyRectOrder(nrects, prects, ordering)
    int			nrects;
    xRectangle		*prects;
    int			ordering;
{
    register xRectangle	*prectP, *prectN;
    register int	i;

    switch(ordering)
    {
      case Unsorted:
	  return CT_UNSORTED;
      case YSorted:
	  if(nrects > 1)
	  {
	      for(i = 1, prectP = prects, prectN = prects + 1;
		  i < nrects;
		  i++, prectP++, prectN++)
		  if(prectN->y < prectP->y)
		      return -1;
	  }
	  return CT_YSORTED;
      case YXSorted:
	  if(nrects > 1)
	  {
	      for(i = 1, prectP = prects, prectN = prects + 1;
		  i < nrects;
		  i++, prectP++, prectN++)
		  if((prectN->y < prectP->y) ||
		      ( (prectN->y == prectP->y) &&
		        (prectN->x < prectP->x) ) )
		      return -1;
	  }
	  return CT_YXSORTED;
      case YXBanded:
	  if(nrects > 1)
	  {
	      for(i = 1, prectP = prects, prectN = prects + 1;
		  i < nrects;
		  i++, prectP++, prectN++)
		  if((prectN->y != prectP->y &&
 		      prectN->y < prectP->y + (int) prectP->height) ||
		     ((prectN->y == prectP->y) &&
		      (prectN->height != prectP->height ||
		       prectN->x < prectP->x + (int) prectP->width)))
		      return -1;
	  }
	  return CT_YXBANDED;
    }
    return -1;
}

int
SetClipRects(pGC, xOrigin, yOrigin, nrects, prects, ordering)
    GCPtr		pGC;
    int			xOrigin, yOrigin;
    int			nrects;
    xRectangle		*prects;
    int			ordering;
{
    int			newct, size;
    xRectangle 		*prectsNew;

    newct = VerifyRectOrder(nrects, prects, ordering);
    if (newct < 0)
	return(BadMatch);
    size = nrects * sizeof(xRectangle);
    prectsNew = (xRectangle *) xalloc(size);
    if (!prectsNew && size)
	return BadAlloc;

    pGC->serialNumber |= GC_CHANGE_SERIAL_BIT;
    pGC->clipOrg.x = xOrigin;
    pGC->stateChanges |= GCClipXOrigin;
		 
    pGC->clipOrg.y = yOrigin;
    pGC->stateChanges |= GCClipYOrigin;

    if (size)
	memmove((char *)prectsNew, (char *)prects, size);
    (*pGC->funcs->ChangeClip)(pGC, newct, (pointer)prectsNew, nrects);
    if (pGC->funcs->ChangeGC)
	(*pGC->funcs->ChangeGC) (pGC, GCClipXOrigin|GCClipYOrigin|GCClipMask);
    return Success;
}


/*
   sets reasonable defaults 
   if we can get a pre-allocated one, use it and mark it as used.
   if we can't, create one out of whole cloth (The Velveteen GC -- if
   you use it often enough it will become real.)
*/
GCPtr
GetScratchGC(depth, pScreen)
    register unsigned depth;
    register ScreenPtr pScreen;
{
    register int i;
    register GCPtr pGC;

    for (i=0; i<=pScreen->numDepths; i++)
        if ( pScreen->GCperDepth[i]->depth == depth &&
	     !(pScreen->rgf & (1L << (i+1)))
	   )
	{
	    pScreen->rgf |= (1L << (i+1));
            pGC = (pScreen->GCperDepth[i]);

	    pGC->alu = GXcopy;
	    pGC->planemask = ~0;
	    pGC->serialNumber = 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 = ArcChord;
	    pGC->patOrg.x = 0;
	    pGC->patOrg.y = 0;
	    pGC->subWindowMode = ClipByChildren;
	    pGC->graphicsExposures = FALSE;
	    pGC->clipOrg.x = 0;
	    pGC->clipOrg.y = 0;
	    if (pGC->clientClipType != CT_NONE)
		(*pGC->funcs->ChangeClip) (pGC, CT_NONE, NULL, 0);
	    pGC->stateChanges = (1 << (GCLastBit+1)) - 1;
	    return pGC;
	}
    /* if we make it this far, need to roll our own */
    pGC = CreateScratchGC(pScreen, depth);
    if (pGC)
	pGC->graphicsExposures = FALSE;
    return pGC;
}

/*
   if the gc to free is in the table of pre-existing ones,
mark it as available.
   if not, free it for real
*/
void
FreeScratchGC(pGC)
    register GCPtr pGC;
{
    register ScreenPtr pScreen = pGC->pScreen;
    register int i;

    for (i=0; i<=pScreen->numDepths; i++)
    {
        if ( pScreen->GCperDepth[i] == pGC)
	{
	    pScreen->rgf &= ~(1L << (i+1));
	    return;
	}
    }
    (void)FreeGC(pGC, (GContext)0);
}