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diff --git a/cfb/cfbzerarc.c b/cfb/cfbzerarc.c
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+/************************************************************
+
+Copyright 1989, 1998 The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+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
+OPEN GROUP 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 Open Group 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 Open Group.
+
+********************************************************/
+
+/* $Xorg: cfbzerarc.c,v 1.4 2001/02/09 02:04:39 xorgcvs Exp $ */
+
+/* Derived from:
+ * "Algorithm for drawing ellipses or hyperbolae with a digital plotter"
+ * by M. L. V. Pitteway
+ * The Computer Journal, November 1967, Volume 10, Number 3, pp. 282-289
+ */
+
+#include "X.h"
+#include "Xprotostr.h"
+#include "miscstruct.h"
+#include "gcstruct.h"
+#include "pixmapstr.h"
+#include "scrnintstr.h"
+#include "cfb.h"
+#include "cfbmskbits.h"
+#include "mizerarc.h"
+#include "cfbrrop.h"
+#include "mi.h"
+
+#ifdef PIXEL_ADDR
+
+static void
+RROP_NAME(cfbZeroArcSS8) (pDraw, pGC, arc)
+ DrawablePtr pDraw;
+ GCPtr pGC;
+ xArc *arc;
+{
+ miZeroArcRec info;
+ Bool do360;
+ register int x;
+ PixelType *addrp;
+ register PixelType *yorgp, *yorgop;
+ RROP_DECLARE
+ register int yoffset;
+ int npwidth, dyoffset;
+ register int y, a, b, d, mask;
+ register int k1, k3, dx, dy;
+
+ cfbGetPixelWidthAndPointer(pDraw,npwidth, addrp)
+
+ RROP_FETCH_GC (pGC);
+ do360 = miZeroArcSetup(arc, &info, TRUE);
+ yorgp = addrp + ((info.yorg + pDraw->y) * npwidth);
+ yorgop = addrp + ((info.yorgo + pDraw->y) * npwidth);
+ info.xorg += pDraw->x;
+ info.xorgo += pDraw->x;
+ MIARCSETUP();
+ yoffset = y ? npwidth : 0;
+ dyoffset = 0;
+ mask = info.initialMask;
+ if (!(arc->width & 1))
+ {
+ if (mask & 2)
+ RROP_SOLID((yorgp + info.xorgo));
+ if (mask & 8)
+ RROP_SOLID((yorgop + info.xorgo));
+ }
+ if (!info.end.x || !info.end.y)
+ {
+ mask = info.end.mask;
+ info.end = info.altend;
+ }
+ if (do360 && (arc->width == arc->height) && !(arc->width & 1))
+ {
+ register int xoffset = npwidth;
+ PixelType *yorghb = yorgp + (info.h * npwidth) + info.xorg;
+ PixelType *yorgohb = yorghb - info.h;
+
+ yorgp += info.xorg;
+ yorgop += info.xorg;
+ yorghb += info.h;
+ while (1)
+ {
+ RROP_SOLID(yorgp + yoffset + x);
+ RROP_SOLID(yorgp + yoffset - x);
+ RROP_SOLID(yorgop - yoffset - x);
+ RROP_SOLID(yorgop - yoffset + x);
+ if (a < 0)
+ break;
+ RROP_SOLID(yorghb - xoffset - y);
+ RROP_SOLID(yorgohb - xoffset + y);
+ RROP_SOLID(yorgohb + xoffset + y);
+ RROP_SOLID(yorghb + xoffset - y);
+ xoffset += npwidth;
+ MIARCCIRCLESTEP(yoffset += npwidth;);
+ }
+ yorgp -= info.xorg;
+ yorgop -= info.xorg;
+ x = info.w;
+ yoffset = info.h * npwidth;
+ }
+ else if (do360)
+ {
+ while (y < info.h || x < info.w)
+ {
+ MIARCOCTANTSHIFT(dyoffset = npwidth;);
+ RROP_SOLID(yorgp + yoffset + info.xorg + x);
+ RROP_SOLID(yorgp + yoffset + info.xorgo - x);
+ RROP_SOLID(yorgop - yoffset + info.xorgo - x);
+ RROP_SOLID(yorgop - yoffset + info.xorg + x);
+ MIARCSTEP(yoffset += dyoffset;, yoffset += npwidth;);
+ }
+ }
+ else
+ {
+ while (y < info.h || x < info.w)
+ {
+ MIARCOCTANTSHIFT(dyoffset = npwidth;);
+ if ((x == info.start.x) || (y == info.start.y))
+ {
+ mask = info.start.mask;
+ info.start = info.altstart;
+ }
+ if (mask & 1)
+ RROP_SOLID(yorgp + yoffset + info.xorg + x);
+ if (mask & 2)
+ RROP_SOLID(yorgp + yoffset + info.xorgo - x);
+ if (mask & 4)
+ RROP_SOLID(yorgop - yoffset + info.xorgo - x);
+ if (mask & 8)
+ RROP_SOLID(yorgop - yoffset + info.xorg + x);
+ if ((x == info.end.x) || (y == info.end.y))
+ {
+ mask = info.end.mask;
+ info.end = info.altend;
+ }
+ MIARCSTEP(yoffset += dyoffset;, yoffset += npwidth;);
+ }
+ }
+ if ((x == info.start.x) || (y == info.start.y))
+ mask = info.start.mask;
+ if (mask & 1)
+ RROP_SOLID(yorgp + yoffset + info.xorg + x);
+ if (mask & 4)
+ RROP_SOLID(yorgop - yoffset + info.xorgo - x);
+ if (arc->height & 1)
+ {
+ if (mask & 2)
+ RROP_SOLID(yorgp + yoffset + info.xorgo - x);
+ if (mask & 8)
+ RROP_SOLID(yorgop - yoffset + info.xorg + x);
+ }
+}
+
+void
+RROP_NAME (cfbZeroPolyArcSS8) (pDraw, pGC, narcs, parcs)
+ register DrawablePtr pDraw;
+ GCPtr pGC;
+ int narcs;
+ xArc *parcs;
+{
+ register xArc *arc;
+ register int i;
+ BoxRec box;
+ int x2, y2;
+ RegionPtr cclip;
+
+ cclip = cfbGetCompositeClip(pGC);
+ for (arc = parcs, i = narcs; --i >= 0; arc++)
+ {
+ if (miCanZeroArc(arc))
+ {
+ box.x1 = arc->x + pDraw->x;
+ box.y1 = arc->y + pDraw->y;
+ /*
+ * Because box.x2 and box.y2 get truncated to 16 bits, and the
+ * RECT_IN_REGION test treats the resulting number as a signed
+ * integer, the RECT_IN_REGION test alone can go the wrong way.
+ * This can result in a server crash because the rendering
+ * routines in this file deal directly with cpu addresses
+ * of pixels to be stored, and do not clip or otherwise check
+ * that all such addresses are within their respective pixmaps.
+ * So we only allow the RECT_IN_REGION test to be used for
+ * values that can be expressed correctly in a signed short.
+ */
+ x2 = box.x1 + (int)arc->width + 1;
+ box.x2 = x2;
+ y2 = box.y1 + (int)arc->height + 1;
+ box.y2 = y2;
+ if ( (x2 <= MAXSHORT) && (y2 <= MAXSHORT) &&
+ (RECT_IN_REGION(pDraw->pScreen, cclip, &box) == rgnIN) )
+ RROP_NAME (cfbZeroArcSS8) (pDraw, pGC, arc);
+ else
+ miZeroPolyArc(pDraw, pGC, 1, arc);
+ }
+ else
+ miPolyArc(pDraw, pGC, 1, arc);
+ }
+}
+
+#endif
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