svn merge -r588:HEAD ^/branches/released .

1 files changed, 848 insertions, 844 deletions

diff --git a/xorg-server/mi/mizerarc.c b/xorg-server/mi/mizerarc.c
index ad84c0123..713d0bd04 100644
--- a/xorg-server/mi/mizerarc.c
+++ b/xorg-server/mi/mizerarc.c
@@ -1,844 +1,848 @@
-/************************************************************
-
-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.
-
-Author:  Bob Scheifler, MIT X Consortium
-
-********************************************************/
-
-
-/* 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
- */
-
-#ifdef HAVE_DIX_CONFIG_H
-#include <dix-config.h>
-#endif
-
-#include <math.h>
-#include <X11/X.h>
-#include <X11/Xprotostr.h>
-#include "regionstr.h"
-#include "gcstruct.h"
-#include "pixmapstr.h"
-#include "mi.h"
-#include "mizerarc.h"
-
-#define FULLCIRCLE (360 * 64)
-#define OCTANT (45 * 64)
-#define QUADRANT (90 * 64)
-#define HALFCIRCLE (180 * 64)
-#define QUADRANT3 (270 * 64)
-
-#ifndef M_PI
-#define M_PI	3.14159265358979323846
-#endif
-
-#define Dsin(d)	((d) == 0 ? 0.0 : ((d) == QUADRANT ? 1.0 : \
-		 ((d) == HALFCIRCLE ? 0.0 : \
-		 ((d) == QUADRANT3 ? -1.0 : sin((double)d*(M_PI/11520.0))))))
-
-#define Dcos(d)	((d) == 0 ? 1.0 : ((d) == QUADRANT ? 0.0 : \
-		 ((d) == HALFCIRCLE ? -1.0 : \
-		 ((d) == QUADRANT3 ? 0.0 : cos((double)d*(M_PI/11520.0))))))
-
-#define EPSILON45 64
-
-typedef struct {
-    int skipStart;
-    int haveStart;
-    DDXPointRec startPt;
-    int haveLast;
-    int skipLast;
-    DDXPointRec endPt;
-    int dashIndex;
-    int dashOffset;
-    int dashIndexInit;
-    int dashOffsetInit;
-} DashInfo;
-
-static miZeroArcPtRec oob = {65536, 65536, 0};
-
-/*
- * (x - l)^2 / (W/2)^2  + (y + H/2)^2 / (H/2)^2 = 1
- *
- * where l is either 0 or .5
- *
- * alpha = 4(W^2)
- * beta = 4(H^2)
- * gamma = 0
- * u = 2(W^2)H
- * v = 4(H^2)l
- * k = -4(H^2)(l^2)
- *
- */
-
-Bool
-miZeroArcSetup(xArc *arc, miZeroArcRec *info, Bool ok360)
-{
-    int l;
-    int angle1, angle2;
-    int startseg, endseg;
-    int startAngle, endAngle;
-    int i, overlap;
-    miZeroArcPtRec start, end;
-
-    l = arc->width & 1;
-    if (arc->width == arc->height)
-    {
-	info->alpha = 4;
-	info->beta = 4;
-	info->k1 = -8;
-	info->k3 = -16;
-	info->b = 12;
-	info->a = (arc->width << 2) - 12;
-	info->d = 17 - (arc->width << 1);
-	if (l)
-	{
-	    info->b -= 4;
-	    info->a += 4;
-	    info->d -= 7;
-	}
-    }
-    else if (!arc->width || !arc->height)
-    {
-	info->alpha = 0;
-	info->beta = 0;
-	info->k1 = 0;
-	info->k3 = 0;
-	info->a = -(int)arc->height;
-	info->b = 0;
-	info->d = -1;
-    }
-    else
-    {
-	/* initial conditions */
-	info->alpha = (arc->width * arc->width) << 2;
-	info->beta = (arc->height * arc->height) << 2;
-	info->k1 = info->beta << 1;
-	info->k3 = info->k1 + (info->alpha << 1);
-	info->b = l ? 0 : -info->beta;
-	info->a = info->alpha * arc->height;
-	info->d = info->b - (info->a >> 1) - (info->alpha >> 2);
-	if (l)
-	    info->d -= info->beta >> 2;
-	info->a -= info->b;
-	/* take first step, d < 0 always */
-	info->b -= info->k1;
-	info->a += info->k1;
-	info->d += info->b;
-	/* octant change, b < 0 always */
-	info->k1 = -info->k1;
-	info->k3 = -info->k3;
-	info->b = -info->b;
-	info->d = info->b - info->a - info->d;
-	info->a = info->a - (info->b << 1);
-    }
-    info->dx = 1;
-    info->dy = 0;
-    info->w = (arc->width + 1) >> 1;
-    info->h = arc->height >> 1;
-    info->xorg = arc->x + (arc->width >> 1);
-    info->yorg = arc->y;
-    info->xorgo = info->xorg + l;
-    info->yorgo = info->yorg + arc->height;
-    if (!arc->width)
-    {
-	if (!arc->height)
-	{
-	    info->x = 0;
-	    info->y = 0;
-	    info->initialMask = 0;
-	    info->startAngle = 0;
-	    info->endAngle = 0;
-	    info->start = oob;
-	    info->end = oob;
-	    return FALSE;
-	}
-	info->x = 0;
-	info->y = 1;
-    }
-    else
-    {
-	info->x = 1;
-	info->y = 0;
-    }
-    angle1 = arc->angle1;
-    angle2 = arc->angle2;
-    if ((angle1 == 0) && (angle2 >= FULLCIRCLE))
-    {
-	startAngle = 0;
-	endAngle = 0;
-    }
-    else
-    {
-	if (angle2 > FULLCIRCLE)
-	    angle2 = FULLCIRCLE;
-	else if (angle2 < -FULLCIRCLE)
-	    angle2 = -FULLCIRCLE;
-	if (angle2 < 0)
-	{
-	    startAngle = angle1 + angle2;
-	    endAngle = angle1;
-	}
-	else
-	{
-	    startAngle = angle1;
-	    endAngle = angle1 + angle2;
-	}
-	if (startAngle < 0)
-	    startAngle = FULLCIRCLE - (-startAngle) % FULLCIRCLE;
-	if (startAngle >= FULLCIRCLE)
-	    startAngle = startAngle % FULLCIRCLE;
-	if (endAngle < 0)
-	    endAngle = FULLCIRCLE - (-endAngle) % FULLCIRCLE;
-	if (endAngle >= FULLCIRCLE)
-	    endAngle = endAngle % FULLCIRCLE;
-    }
-    info->startAngle = startAngle;
-    info->endAngle = endAngle;
-    if (ok360 && (startAngle == endAngle) && arc->angle2 &&
-	arc->width && arc->height)
-    {
-	info->initialMask = 0xf;
-	info->start = oob;
-	info->end = oob;
-	return TRUE;
-    }
-    startseg = startAngle / OCTANT;
-    if (!arc->height || (((startseg + 1) & 2) && arc->width))
-    {
-	start.x = Dcos(startAngle) * ((arc->width + 1) / 2.0);
-	if (start.x < 0)
-	    start.x = -start.x;
-	start.y = -1;
-    }
-    else
-    {
-	start.y = Dsin(startAngle) * (arc->height / 2.0);
-	if (start.y < 0)
-	    start.y = -start.y;
-	start.y = info->h - start.y;
-	start.x = 65536;
-    }
-    endseg = endAngle / OCTANT;
-    if (!arc->height || (((endseg + 1) & 2) && arc->width))
-    {
-	end.x = Dcos(endAngle) * ((arc->width + 1) / 2.0);
-	if (end.x < 0)
-	    end.x = -end.x;
-	end.y = -1;
-    }
-    else
-    {
-	end.y = Dsin(endAngle) * (arc->height / 2.0);
-	if (end.y < 0)
-	    end.y = -end.y;
-	end.y = info->h - end.y;
-	end.x = 65536;
-    }
-    info->firstx = start.x;
-    info->firsty = start.y;
-    info->initialMask = 0;
-    overlap = arc->angle2 && (endAngle <= startAngle);
-    for (i = 0; i < 4; i++)
-    {
-	if (overlap ?
-	    ((i * QUADRANT <= endAngle) || ((i + 1) * QUADRANT > startAngle)) :
-	    ((i * QUADRANT <= endAngle) && ((i + 1) * QUADRANT > startAngle)))
-	    info->initialMask |= (1 << i);
-    }
-    start.mask = info->initialMask;
-    end.mask = info->initialMask;
-    startseg >>= 1;
-    endseg >>= 1;
-    overlap = overlap && (endseg == startseg);
-    if (start.x != end.x || start.y != end.y || !overlap)
-    {
-	if (startseg & 1)
-	{
-	    if (!overlap)
-		info->initialMask &= ~(1 << startseg);
-	    if (start.x > end.x || start.y > end.y)
-		end.mask &= ~(1 << startseg);
-	}
-	else
-	{
-	    start.mask &= ~(1 << startseg);
-	    if (((start.x < end.x || start.y < end.y) ||
-		 (start.x == end.x && start.y == end.y && (endseg & 1))) &&
-		!overlap)
-		end.mask &= ~(1 << startseg);
-	}
-	if (endseg & 1)
-	{
-	    end.mask &= ~(1 << endseg);
-	    if (((start.x > end.x || start.y > end.y) ||
-		 (start.x == end.x && start.y == end.y && !(startseg & 1))) &&
-		!overlap)
-		start.mask &= ~(1 << endseg);
-	}
-	else
-	{
-	    if (!overlap)
-		info->initialMask &= ~(1 << endseg);
-	    if (start.x < end.x || start.y < end.y)
-		start.mask &= ~(1 << endseg);
-	}
-    }
-    /* take care of case when start and stop are both near 45 */
-    /* handle here rather than adding extra code to pixelization loops */
-    if (startAngle &&
-	((start.y < 0 && end.y >= 0) || (start.y >= 0 && end.y < 0)))
-    {
-	i = (startAngle + OCTANT) % OCTANT;
-	if (i < EPSILON45 || i > OCTANT - EPSILON45)
-	{
-	    i = (endAngle + OCTANT) % OCTANT;
-	    if (i < EPSILON45 || i > OCTANT - EPSILON45)
-	    {
-		if (start.y < 0)
-		{
-		    i = Dsin(startAngle) * (arc->height / 2.0);
-		    if (i < 0)
-			i = -i;
-		    if (info->h - i == end.y)
-			start.mask = end.mask;
-		}
-		else
-		{
-		    i = Dsin(endAngle) * (arc->height / 2.0);
-		    if (i < 0)
-			i = -i;
-		    if (info->h - i == start.y)
-			end.mask = start.mask;
-		}
-	    }
-	}
-    }
-    if (startseg & 1)
-    {
-	info->start = start;
-	info->end = oob;
-    }
-    else
-    {
-	info->end = start;
-	info->start = oob;
-    }
-    if (endseg & 1)
-    {
-	info->altend = end;
-	if (info->altend.x < info->end.x || info->altend.y < info->end.y)
-	{
-	    miZeroArcPtRec tmp;
-	    tmp = info->altend;
-	    info->altend = info->end;
-	    info->end = tmp;
-	}
-	info->altstart = oob;
-    }
-    else
-    {
-	info->altstart = end;
-	if (info->altstart.x < info->start.x ||
-	    info->altstart.y < info->start.y)
-	{
-	    miZeroArcPtRec tmp;
-	    tmp = info->altstart;
-	    info->altstart = info->start;
-	    info->start = tmp;
-	}
-	info->altend = oob;
-    }
-    if (!info->start.x || !info->start.y)
-    {
-	info->initialMask = info->start.mask;
-	info->start = info->altstart;
-    }
-    if (!arc->width && (arc->height == 1))
-    {
-	/* kludge! */
-	info->initialMask |= info->end.mask;
-	info->initialMask |= info->initialMask << 1;
-	info->end.x = 0;
-	info->end.mask = 0;
-    }
-    return FALSE;
-}
-
-#define Pixelate(xval,yval) \
-    { \
-	pts->x = xval; \
-	pts->y = yval; \
-	pts++; \
-    }
-
-#define DoPix(idx,xval,yval) if (mask & (1 << idx)) Pixelate(xval, yval);
-
-static DDXPointPtr
-miZeroArcPts(xArc *arc, DDXPointPtr pts)
-{
-    miZeroArcRec info;
-    int x, y, a, b, d, mask;
-    int k1, k3, dx, dy;
-    Bool do360;
-
-    do360 = miZeroArcSetup(arc, &info, TRUE);
-    MIARCSETUP();
-    mask = info.initialMask;
-    if (!(arc->width & 1))
-    {
-	DoPix(1, info.xorgo, info.yorg);
-	DoPix(3, info.xorgo, info.yorgo);
-    }
-    if (!info.end.x || !info.end.y)
-    {
-	mask = info.end.mask;
-	info.end = info.altend;
-    }
-    if (do360 && (arc->width == arc->height) && !(arc->width & 1))
-    {
-	int yorgh = info.yorg + info.h;
-	int xorghp = info.xorg + info.h;
-	int xorghn = info.xorg - info.h;
-
-	while (1)
-	{
-	    Pixelate(info.xorg + x, info.yorg + y);
-	    Pixelate(info.xorg - x, info.yorg + y);
-	    Pixelate(info.xorg - x, info.yorgo - y);
-	    Pixelate(info.xorg + x, info.yorgo - y);
-	    if (a < 0)
-		break;
-	    Pixelate(xorghp - y, yorgh - x);
-	    Pixelate(xorghn + y, yorgh - x);
-	    Pixelate(xorghn + y, yorgh + x);
-	    Pixelate(xorghp - y, yorgh + x);
-	    MIARCCIRCLESTEP(;);
-	}
-	if (x > 1 && pts[-1].x == pts[-5].x && pts[-1].y == pts[-5].y)
-	    pts -= 4;
-	x = info.w;
-	y = info.h;
-    }
-    else if (do360)
-    {
-	while (y < info.h || x < info.w)
-	{
-	    MIARCOCTANTSHIFT(;);
-	    Pixelate(info.xorg + x, info.yorg + y);
-	    Pixelate(info.xorgo - x, info.yorg + y);
-	    Pixelate(info.xorgo - x, info.yorgo - y);
-	    Pixelate(info.xorg + x, info.yorgo - y);
-	    MIARCSTEP(;,;);
-	}
-    }
-    else
-    {
-	while (y < info.h || x < info.w)
-	{
-	    MIARCOCTANTSHIFT(;);
-	    if ((x == info.start.x) || (y == info.start.y))
-	    {
-		mask = info.start.mask;
-		info.start = info.altstart;
-	    }
-	    DoPix(0, info.xorg + x, info.yorg + y);
-	    DoPix(1, info.xorgo - x, info.yorg + y);
-	    DoPix(2, info.xorgo - x, info.yorgo - y);
-	    DoPix(3, info.xorg + x, info.yorgo - y);
-	    if ((x == info.end.x) || (y == info.end.y))
-	    {
-		mask = info.end.mask;
-		info.end = info.altend;
-	    }
-	    MIARCSTEP(;,;);
-	}
-    }
-    if ((x == info.start.x) || (y == info.start.y))
-	mask = info.start.mask;
-    DoPix(0, info.xorg + x, info.yorg + y);
-    DoPix(2, info.xorgo - x, info.yorgo - y);
-    if (arc->height & 1)
-    {
-	DoPix(1, info.xorgo - x, info.yorg + y);
-	DoPix(3, info.xorg + x, info.yorgo - y);
-    }
-    return pts;
-}
-
-#undef DoPix
-#define DoPix(idx,xval,yval) \
-    if (mask & (1 << idx)) \
-    { \
-	arcPts[idx]->x = xval; \
-	arcPts[idx]->y = yval; \
-	arcPts[idx]++; \
-    }
-
-static void
-miZeroArcDashPts(
-    GCPtr pGC,
-    xArc *arc,
-    DashInfo *dinfo,
-    DDXPointPtr points,
-    int maxPts,
-    DDXPointPtr *evenPts, 
-    DDXPointPtr *oddPts )
-{
-    miZeroArcRec info;
-    int x, y, a, b, d, mask;
-    int k1, k3, dx, dy;
-    int dashRemaining;
-    DDXPointPtr arcPts[4];
-    DDXPointPtr startPts[5], endPts[5];
-    int deltas[5];
-    DDXPointPtr startPt, pt, lastPt, pts;
-    int i, j, delta, ptsdelta, seg, startseg;
-
-    for (i = 0; i < 4; i++)
-	arcPts[i] = points + (i * maxPts);
-    (void)miZeroArcSetup(arc, &info, FALSE);
-    MIARCSETUP();
-    mask = info.initialMask;
-    startseg = info.startAngle / QUADRANT;
-    startPt = arcPts[startseg];
-    if (!(arc->width & 1))
-    {
-	DoPix(1, info.xorgo, info.yorg);
-	DoPix(3, info.xorgo, info.yorgo);
-    }
-    if (!info.end.x || !info.end.y)
-    {
-	mask = info.end.mask;
-	info.end = info.altend;
-    }
-    while (y < info.h || x < info.w)
-    {
-	MIARCOCTANTSHIFT(;);
-	if ((x == info.firstx) || (y == info.firsty))
-	    startPt = arcPts[startseg];
-	if ((x == info.start.x) || (y == info.start.y))
-	{
-	    mask = info.start.mask;
-	    info.start = info.altstart;
-	}
-	DoPix(0, info.xorg + x, info.yorg + y);
-	DoPix(1, info.xorgo - x, info.yorg + y);
-	DoPix(2, info.xorgo - x, info.yorgo - y);
-	DoPix(3, info.xorg + x, info.yorgo - y);
-	if ((x == info.end.x) || (y == info.end.y))
-	{
-	    mask = info.end.mask;
-	    info.end = info.altend;
-	}
-	MIARCSTEP(;,;);
-    }
-    if ((x == info.firstx) || (y == info.firsty))
-	startPt = arcPts[startseg];
-    if ((x == info.start.x) || (y == info.start.y))
-	mask = info.start.mask;
-    DoPix(0, info.xorg + x, info.yorg + y);
-    DoPix(2, info.xorgo - x, info.yorgo - y);
-    if (arc->height & 1)
-    {
-	DoPix(1, info.xorgo - x, info.yorg + y);
-	DoPix(3, info.xorg + x, info.yorgo - y);
-    }
-    for (i = 0; i < 4; i++)
-    {
-	seg = (startseg + i) & 3;
-	pt = points + (seg * maxPts);
-	if (seg & 1)
-	{
-	    startPts[i] = pt;
-	    endPts[i] = arcPts[seg];
-	    deltas[i] = 1;
-	}
-	else
-	{
-	    startPts[i] = arcPts[seg] - 1;
-	    endPts[i] = pt - 1;
-	    deltas[i] = -1;
-	}
-    }
-    startPts[4] = startPts[0];
-    endPts[4] = startPt;
-    startPts[0] = startPt;
-    if (startseg & 1)
-    {
-	if (startPts[4] != endPts[4])
-	    endPts[4]--;
-	deltas[4] = 1;
-    }
-    else
-    {
-	if (startPts[0] > startPts[4])
-	    startPts[0]--;
-	if (startPts[4] < endPts[4])
-	    endPts[4]--;
-	deltas[4] = -1;
-    }
-    if (arc->angle2 < 0)
-    {
-	DDXPointPtr tmps, tmpe;
-	int tmpd;
-
-	tmpd = deltas[0];
-	tmps = startPts[0] - tmpd;
-	tmpe = endPts[0] - tmpd;
-	startPts[0] = endPts[4] - deltas[4];
-	endPts[0] = startPts[4] - deltas[4];
-	deltas[0] = -deltas[4];
-	startPts[4] = tmpe;
-	endPts[4] = tmps;
-	deltas[4] = -tmpd;
-	tmpd = deltas[1];
-	tmps = startPts[1] - tmpd;
-	tmpe = endPts[1] - tmpd;
-	startPts[1] = endPts[3] - deltas[3];
-	endPts[1] = startPts[3] - deltas[3];
-	deltas[1] = -deltas[3];
-	startPts[3] = tmpe;
-	endPts[3] = tmps;
-	deltas[3] = -tmpd;
-	tmps = startPts[2] - deltas[2];
-	startPts[2] = endPts[2] - deltas[2];
-	endPts[2] = tmps;
-	deltas[2] = -deltas[2];
-    }
-    for (i = 0; i < 5 && startPts[i] == endPts[i]; i++)
-	;
-    if (i == 5)
-	return;
-    pt = startPts[i];
-    for (j = 4; startPts[j] == endPts[j]; j--)
-	;
-    lastPt = endPts[j] - deltas[j];
-    if (dinfo->haveLast &&
-	(pt->x == dinfo->endPt.x) && (pt->y == dinfo->endPt.y))
-    {
-	startPts[i] += deltas[i];
-    }
-    else
-    {
-	dinfo->dashIndex = dinfo->dashIndexInit;
-	dinfo->dashOffset = dinfo->dashOffsetInit;
-    }
-    if (!dinfo->skipStart && (info.startAngle != info.endAngle))
-    {
-	dinfo->startPt = *pt;
-	dinfo->haveStart = TRUE;
-    }
-    else if (!dinfo->skipLast && dinfo->haveStart &&
-	     (lastPt->x == dinfo->startPt.x) &&
-	     (lastPt->y == dinfo->startPt.y) &&
-	     (lastPt != startPts[i]))
-	endPts[j] = lastPt;
-    if (info.startAngle != info.endAngle)
-    {
-	dinfo->haveLast = TRUE;
-	dinfo->endPt = *lastPt;
-    }
-    dashRemaining = pGC->dash[dinfo->dashIndex] - dinfo->dashOffset;
-    for (i = 0; i < 5; i++)
-    {
-	pt = startPts[i];
-	lastPt = endPts[i];
-	delta = deltas[i];
-	while (pt != lastPt)
-	{
-	    if (dinfo->dashIndex & 1)
-	    {
-		pts = *oddPts;
-		ptsdelta = -1;
-	    }
-	    else
-	    {
-		pts = *evenPts;
-		ptsdelta = 1;
-	    }
-	    while ((pt != lastPt) && --dashRemaining >= 0)
-	    {
-		*pts = *pt;
-		pts += ptsdelta;
-		pt += delta;
-	    }
-	    if (dinfo->dashIndex & 1)
-		*oddPts = pts;
-	    else
-		*evenPts = pts;
-	    if (dashRemaining <= 0)
-	    {
-		if (++(dinfo->dashIndex) == pGC->numInDashList)
-		    dinfo->dashIndex = 0;
-		dashRemaining = pGC->dash[dinfo->dashIndex];
-	    }
-	}
-    }
-    dinfo->dashOffset = pGC->dash[dinfo->dashIndex] - dashRemaining;
-}
-
-void
-miZeroPolyArc(DrawablePtr pDraw, GCPtr pGC, int narcs, xArc *parcs)
-{
-    int maxPts = 0;
-    int n, maxw = 0;
-    xArc *arc;
-    int i;
-    DDXPointPtr points, pts, oddPts = NULL;
-    DDXPointPtr pt;
-    int numPts;
-    Bool dospans;
-    int *widths = NULL;
-    XID fgPixel = pGC->fgPixel;
-    DashInfo dinfo;
-
-    for (arc = parcs, i = narcs; --i >= 0; arc++)
-    {
-	if (!miCanZeroArc(arc))
-	    miPolyArc(pDraw, pGC, 1, arc);
-	else
-	{
-	    if (arc->width > arc->height)
-		n = arc->width + (arc->height >> 1);
-	    else
-		n = arc->height + (arc->width >> 1);
-	    if (n > maxPts)
-		maxPts = n;
-	}
-    }
-    if (!maxPts)
-	return;
-    numPts = maxPts << 2;
-    dospans = (pGC->fillStyle != FillSolid);
-    if (dospans)
-    {
-	widths = xalloc(sizeof(int) * numPts);
-	if (!widths)
-	    return;
-	maxw = 0;
-    }
-    if (pGC->lineStyle != LineSolid)
-    {
-	numPts <<= 1;
-	dinfo.haveStart = FALSE;
-	dinfo.skipStart = FALSE;
-	dinfo.haveLast = FALSE;
-	dinfo.dashIndexInit = 0;
-	dinfo.dashOffsetInit = 0;
-	miStepDash((int)pGC->dashOffset, &dinfo.dashIndexInit,
-		   (unsigned char *) pGC->dash, (int)pGC->numInDashList,
-		   &dinfo.dashOffsetInit);
-    }
-    points = xalloc(sizeof(DDXPointRec) * numPts);
-    if (!points)
-    {
-	if (dospans)
-	{
-	    xfree(widths);
-	}
-	return;
-    }
-    for (arc = parcs, i = narcs; --i >= 0; arc++)
-    {
-	if (miCanZeroArc(arc))
-	{
-	    if (pGC->lineStyle == LineSolid)
-		pts = miZeroArcPts(arc, points);
-	    else
-	    {
-		pts = points;
-		oddPts = &points[(numPts >> 1) - 1];
-		dinfo.skipLast = i;
-		miZeroArcDashPts(pGC, arc, &dinfo,
-				 oddPts + 1, maxPts, &pts, &oddPts);
-		dinfo.skipStart = TRUE;
-	    }
-	    n = pts - points;
-	    if (!dospans)
-		(*pGC->ops->PolyPoint)(pDraw, pGC, CoordModeOrigin, n, points);
-	    else
-	    {
-		if (n > maxw)
-		{
-		    while (maxw < n)
-			widths[maxw++] = 1;
-		}
-		if (pGC->miTranslate)
-		{
-		    for (pt = points; pt != pts; pt++)
-		    {
-			pt->x += pDraw->x;
-			pt->y += pDraw->y;
-		    }
-		}
-		(*pGC->ops->FillSpans)(pDraw, pGC, n, points, widths, FALSE);
-	    }
-	    if (pGC->lineStyle != LineDoubleDash)
-		continue;
-	    if ((pGC->fillStyle == FillSolid) ||
-		(pGC->fillStyle == FillStippled))
-	    {
-		DoChangeGC(pGC, GCForeground, (XID *)&pGC->bgPixel, 0);
-		ValidateGC(pDraw, pGC);
-	    }
-	    pts = &points[numPts >> 1];
-	    oddPts++;
-	    n = pts - oddPts;
-	    if (!dospans)
-		(*pGC->ops->PolyPoint)(pDraw, pGC, CoordModeOrigin, n, oddPts);
-	    else
-	    {
-		if (n > maxw)
-		{
-		    while (maxw < n)
-			widths[maxw++] = 1;
-		}
-		if (pGC->miTranslate)
-		{
-		    for (pt = oddPts; pt != pts; pt++)
-		    {
-			pt->x += pDraw->x;
-			pt->y += pDraw->y;
-		    }
-		}
-		(*pGC->ops->FillSpans)(pDraw, pGC, n, oddPts, widths, FALSE);
-	    }
-	    if ((pGC->fillStyle == FillSolid) ||
-		(pGC->fillStyle == FillStippled))
-	    {
-		DoChangeGC(pGC, GCForeground, &fgPixel, 0);
-		ValidateGC(pDraw, pGC);
-	    }
-	}
-    }
-    xfree(points);
-    if (dospans)
-    {
-	xfree(widths);
-    }
-}
+/************************************************************

+

+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.

+

+Author:  Bob Scheifler, MIT X Consortium

+

+********************************************************/

+

+

+/* 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

+ */

+

+#ifdef HAVE_DIX_CONFIG_H

+#include <dix-config.h>

+#endif

+

+#include <math.h>

+#include <X11/X.h>

+#include <X11/Xprotostr.h>

+#include "regionstr.h"

+#include "gcstruct.h"

+#include "pixmapstr.h"

+#include "mi.h"

+#include "mizerarc.h"

+

+#define FULLCIRCLE (360 * 64)

+#define OCTANT (45 * 64)

+#define QUADRANT (90 * 64)

+#define HALFCIRCLE (180 * 64)

+#define QUADRANT3 (270 * 64)

+

+#ifndef M_PI

+#define M_PI	3.14159265358979323846

+#endif

+

+#define Dsin(d)	((d) == 0 ? 0.0 : ((d) == QUADRANT ? 1.0 : \

+		 ((d) == HALFCIRCLE ? 0.0 : \

+		 ((d) == QUADRANT3 ? -1.0 : sin((double)d*(M_PI/11520.0))))))

+

+#define Dcos(d)	((d) == 0 ? 1.0 : ((d) == QUADRANT ? 0.0 : \

+		 ((d) == HALFCIRCLE ? -1.0 : \

+		 ((d) == QUADRANT3 ? 0.0 : cos((double)d*(M_PI/11520.0))))))

+

+#define EPSILON45 64

+

+typedef struct {

+    int skipStart;

+    int haveStart;

+    DDXPointRec startPt;

+    int haveLast;

+    int skipLast;

+    DDXPointRec endPt;

+    int dashIndex;

+    int dashOffset;

+    int dashIndexInit;

+    int dashOffsetInit;

+} DashInfo;

+

+static miZeroArcPtRec oob = {65536, 65536, 0};

+

+/*

+ * (x - l)^2 / (W/2)^2  + (y + H/2)^2 / (H/2)^2 = 1

+ *

+ * where l is either 0 or .5

+ *

+ * alpha = 4(W^2)

+ * beta = 4(H^2)

+ * gamma = 0

+ * u = 2(W^2)H

+ * v = 4(H^2)l

+ * k = -4(H^2)(l^2)

+ *

+ */

+

+Bool

+miZeroArcSetup(xArc *arc, miZeroArcRec *info, Bool ok360)

+{

+    int l;

+    int angle1, angle2;

+    int startseg, endseg;

+    int startAngle, endAngle;

+    int i, overlap;

+    miZeroArcPtRec start, end;

+

+    l = arc->width & 1;

+    if (arc->width == arc->height)

+    {

+	info->alpha = 4;

+	info->beta = 4;

+	info->k1 = -8;

+	info->k3 = -16;

+	info->b = 12;

+	info->a = (arc->width << 2) - 12;

+	info->d = 17 - (arc->width << 1);

+	if (l)

+	{

+	    info->b -= 4;

+	    info->a += 4;

+	    info->d -= 7;

+	}

+    }

+    else if (!arc->width || !arc->height)

+    {

+	info->alpha = 0;

+	info->beta = 0;

+	info->k1 = 0;

+	info->k3 = 0;

+	info->a = -(int)arc->height;

+	info->b = 0;

+	info->d = -1;

+    }

+    else

+    {

+	/* initial conditions */

+	info->alpha = (arc->width * arc->width) << 2;

+	info->beta = (arc->height * arc->height) << 2;

+	info->k1 = info->beta << 1;

+	info->k3 = info->k1 + (info->alpha << 1);

+	info->b = l ? 0 : -info->beta;

+	info->a = info->alpha * arc->height;

+	info->d = info->b - (info->a >> 1) - (info->alpha >> 2);

+	if (l)

+	    info->d -= info->beta >> 2;

+	info->a -= info->b;

+	/* take first step, d < 0 always */

+	info->b -= info->k1;

+	info->a += info->k1;

+	info->d += info->b;

+	/* octant change, b < 0 always */

+	info->k1 = -info->k1;

+	info->k3 = -info->k3;

+	info->b = -info->b;

+	info->d = info->b - info->a - info->d;

+	info->a = info->a - (info->b << 1);

+    }

+    info->dx = 1;

+    info->dy = 0;

+    info->w = (arc->width + 1) >> 1;

+    info->h = arc->height >> 1;

+    info->xorg = arc->x + (arc->width >> 1);

+    info->yorg = arc->y;

+    info->xorgo = info->xorg + l;

+    info->yorgo = info->yorg + arc->height;

+    if (!arc->width)

+    {

+	if (!arc->height)

+	{

+	    info->x = 0;

+	    info->y = 0;

+	    info->initialMask = 0;

+	    info->startAngle = 0;

+	    info->endAngle = 0;

+	    info->start = oob;

+	    info->end = oob;

+	    return FALSE;

+	}

+	info->x = 0;

+	info->y = 1;

+    }

+    else

+    {

+	info->x = 1;

+	info->y = 0;

+    }

+    angle1 = arc->angle1;

+    angle2 = arc->angle2;

+    if ((angle1 == 0) && (angle2 >= FULLCIRCLE))

+    {

+	startAngle = 0;

+	endAngle = 0;

+    }

+    else

+    {

+	if (angle2 > FULLCIRCLE)

+	    angle2 = FULLCIRCLE;

+	else if (angle2 < -FULLCIRCLE)

+	    angle2 = -FULLCIRCLE;

+	if (angle2 < 0)

+	{

+	    startAngle = angle1 + angle2;

+	    endAngle = angle1;

+	}

+	else

+	{

+	    startAngle = angle1;

+	    endAngle = angle1 + angle2;

+	}

+	if (startAngle < 0)

+	    startAngle = FULLCIRCLE - (-startAngle) % FULLCIRCLE;

+	if (startAngle >= FULLCIRCLE)

+	    startAngle = startAngle % FULLCIRCLE;

+	if (endAngle < 0)

+	    endAngle = FULLCIRCLE - (-endAngle) % FULLCIRCLE;

+	if (endAngle >= FULLCIRCLE)

+	    endAngle = endAngle % FULLCIRCLE;

+    }

+    info->startAngle = startAngle;

+    info->endAngle = endAngle;

+    if (ok360 && (startAngle == endAngle) && arc->angle2 &&

+	arc->width && arc->height)

+    {

+	info->initialMask = 0xf;

+	info->start = oob;

+	info->end = oob;

+	return TRUE;

+    }

+    startseg = startAngle / OCTANT;

+    if (!arc->height || (((startseg + 1) & 2) && arc->width))

+    {

+	start.x = Dcos(startAngle) * ((arc->width + 1) / 2.0);

+	if (start.x < 0)

+	    start.x = -start.x;

+	start.y = -1;

+    }

+    else

+    {

+	start.y = Dsin(startAngle) * (arc->height / 2.0);

+	if (start.y < 0)

+	    start.y = -start.y;

+	start.y = info->h - start.y;

+	start.x = 65536;

+    }

+    endseg = endAngle / OCTANT;

+    if (!arc->height || (((endseg + 1) & 2) && arc->width))

+    {

+	end.x = Dcos(endAngle) * ((arc->width + 1) / 2.0);

+	if (end.x < 0)

+	    end.x = -end.x;

+	end.y = -1;

+    }

+    else

+    {

+	end.y = Dsin(endAngle) * (arc->height / 2.0);

+	if (end.y < 0)

+	    end.y = -end.y;

+	end.y = info->h - end.y;

+	end.x = 65536;

+    }

+    info->firstx = start.x;

+    info->firsty = start.y;

+    info->initialMask = 0;

+    overlap = arc->angle2 && (endAngle <= startAngle);

+    for (i = 0; i < 4; i++)

+    {

+	if (overlap ?

+	    ((i * QUADRANT <= endAngle) || ((i + 1) * QUADRANT > startAngle)) :

+	    ((i * QUADRANT <= endAngle) && ((i + 1) * QUADRANT > startAngle)))

+	    info->initialMask |= (1 << i);

+    }

+    start.mask = info->initialMask;

+    end.mask = info->initialMask;

+    startseg >>= 1;

+    endseg >>= 1;

+    overlap = overlap && (endseg == startseg);

+    if (start.x != end.x || start.y != end.y || !overlap)

+    {

+	if (startseg & 1)

+	{

+	    if (!overlap)

+		info->initialMask &= ~(1 << startseg);

+	    if (start.x > end.x || start.y > end.y)

+		end.mask &= ~(1 << startseg);

+	}

+	else

+	{

+	    start.mask &= ~(1 << startseg);

+	    if (((start.x < end.x || start.y < end.y) ||

+		 (start.x == end.x && start.y == end.y && (endseg & 1))) &&

+		!overlap)

+		end.mask &= ~(1 << startseg);

+	}

+	if (endseg & 1)

+	{

+	    end.mask &= ~(1 << endseg);

+	    if (((start.x > end.x || start.y > end.y) ||

+		 (start.x == end.x && start.y == end.y && !(startseg & 1))) &&

+		!overlap)

+		start.mask &= ~(1 << endseg);

+	}

+	else

+	{

+	    if (!overlap)

+		info->initialMask &= ~(1 << endseg);

+	    if (start.x < end.x || start.y < end.y)

+		start.mask &= ~(1 << endseg);

+	}

+    }

+    /* take care of case when start and stop are both near 45 */

+    /* handle here rather than adding extra code to pixelization loops */

+    if (startAngle &&

+	((start.y < 0 && end.y >= 0) || (start.y >= 0 && end.y < 0)))

+    {

+	i = (startAngle + OCTANT) % OCTANT;

+	if (i < EPSILON45 || i > OCTANT - EPSILON45)

+	{

+	    i = (endAngle + OCTANT) % OCTANT;

+	    if (i < EPSILON45 || i > OCTANT - EPSILON45)

+	    {

+		if (start.y < 0)

+		{

+		    i = Dsin(startAngle) * (arc->height / 2.0);

+		    if (i < 0)

+			i = -i;

+		    if (info->h - i == end.y)

+			start.mask = end.mask;

+		}

+		else

+		{

+		    i = Dsin(endAngle) * (arc->height / 2.0);

+		    if (i < 0)

+			i = -i;

+		    if (info->h - i == start.y)

+			end.mask = start.mask;

+		}

+	    }

+	}

+    }

+    if (startseg & 1)

+    {

+	info->start = start;

+	info->end = oob;

+    }

+    else

+    {

+	info->end = start;

+	info->start = oob;

+    }

+    if (endseg & 1)

+    {

+	info->altend = end;

+	if (info->altend.x < info->end.x || info->altend.y < info->end.y)

+	{

+	    miZeroArcPtRec tmp;

+	    tmp = info->altend;

+	    info->altend = info->end;

+	    info->end = tmp;

+	}

+	info->altstart = oob;

+    }

+    else

+    {

+	info->altstart = end;

+	if (info->altstart.x < info->start.x ||

+	    info->altstart.y < info->start.y)

+	{

+	    miZeroArcPtRec tmp;

+	    tmp = info->altstart;

+	    info->altstart = info->start;

+	    info->start = tmp;

+	}

+	info->altend = oob;

+    }

+    if (!info->start.x || !info->start.y)

+    {

+	info->initialMask = info->start.mask;

+	info->start = info->altstart;

+    }

+    if (!arc->width && (arc->height == 1))

+    {

+	/* kludge! */

+	info->initialMask |= info->end.mask;

+	info->initialMask |= info->initialMask << 1;

+	info->end.x = 0;

+	info->end.mask = 0;

+    }

+    return FALSE;

+}

+

+#define Pixelate(xval,yval) \

+    { \

+	pts->x = xval; \

+	pts->y = yval; \

+	pts++; \

+    }

+

+#define DoPix(idx,xval,yval) if (mask & (1 << idx)) Pixelate(xval, yval);

+

+static DDXPointPtr

+miZeroArcPts(xArc *arc, DDXPointPtr pts)

+{

+    miZeroArcRec info;

+    int x, y, a, b, d, mask;

+    int k1, k3, dx, dy;

+    Bool do360;

+

+    do360 = miZeroArcSetup(arc, &info, TRUE);

+    MIARCSETUP();

+    mask = info.initialMask;

+    if (!(arc->width & 1))

+    {

+	DoPix(1, info.xorgo, info.yorg);

+	DoPix(3, info.xorgo, info.yorgo);

+    }

+    if (!info.end.x || !info.end.y)

+    {

+	mask = info.end.mask;

+	info.end = info.altend;

+    }

+    if (do360 && (arc->width == arc->height) && !(arc->width & 1))

+    {

+	int yorgh = info.yorg + info.h;

+	int xorghp = info.xorg + info.h;

+	int xorghn = info.xorg - info.h;

+

+	while (1)

+	{

+	    Pixelate(info.xorg + x, info.yorg + y);

+	    Pixelate(info.xorg - x, info.yorg + y);

+	    Pixelate(info.xorg - x, info.yorgo - y);

+	    Pixelate(info.xorg + x, info.yorgo - y);

+	    if (a < 0)

+		break;

+	    Pixelate(xorghp - y, yorgh - x);

+	    Pixelate(xorghn + y, yorgh - x);

+	    Pixelate(xorghn + y, yorgh + x);

+	    Pixelate(xorghp - y, yorgh + x);

+	    MIARCCIRCLESTEP(;);

+	}

+	if (x > 1 && pts[-1].x == pts[-5].x && pts[-1].y == pts[-5].y)

+	    pts -= 4;

+	x = info.w;

+	y = info.h;

+    }

+    else if (do360)

+    {

+	while (y < info.h || x < info.w)

+	{

+	    MIARCOCTANTSHIFT(;);

+	    Pixelate(info.xorg + x, info.yorg + y);

+	    Pixelate(info.xorgo - x, info.yorg + y);

+	    Pixelate(info.xorgo - x, info.yorgo - y);

+	    Pixelate(info.xorg + x, info.yorgo - y);

+	    MIARCSTEP(;,;);

+	}

+    }

+    else

+    {

+	while (y < info.h || x < info.w)

+	{

+	    MIARCOCTANTSHIFT(;);

+	    if ((x == info.start.x) || (y == info.start.y))

+	    {

+		mask = info.start.mask;

+		info.start = info.altstart;

+	    }

+	    DoPix(0, info.xorg + x, info.yorg + y);

+	    DoPix(1, info.xorgo - x, info.yorg + y);

+	    DoPix(2, info.xorgo - x, info.yorgo - y);

+	    DoPix(3, info.xorg + x, info.yorgo - y);

+	    if ((x == info.end.x) || (y == info.end.y))

+	    {

+		mask = info.end.mask;

+		info.end = info.altend;

+	    }

+	    MIARCSTEP(;,;);

+	}

+    }

+    if ((x == info.start.x) || (y == info.start.y))

+	mask = info.start.mask;

+    DoPix(0, info.xorg + x, info.yorg + y);

+    DoPix(2, info.xorgo - x, info.yorgo - y);

+    if (arc->height & 1)

+    {

+	DoPix(1, info.xorgo - x, info.yorg + y);

+	DoPix(3, info.xorg + x, info.yorgo - y);

+    }

+    return pts;

+}

+

+#undef DoPix

+#define DoPix(idx,xval,yval) \

+    if (mask & (1 << idx)) \

+    { \

+	arcPts[idx]->x = xval; \

+	arcPts[idx]->y = yval; \

+	arcPts[idx]++; \

+    }

+

+static void

+miZeroArcDashPts(

+    GCPtr pGC,

+    xArc *arc,

+    DashInfo *dinfo,

+    DDXPointPtr points,

+    int maxPts,

+    DDXPointPtr *evenPts, 

+    DDXPointPtr *oddPts )

+{

+    miZeroArcRec info;

+    int x, y, a, b, d, mask;

+    int k1, k3, dx, dy;

+    int dashRemaining;

+    DDXPointPtr arcPts[4];

+    DDXPointPtr startPts[5], endPts[5];

+    int deltas[5];

+    DDXPointPtr startPt, pt, lastPt, pts;

+    int i, j, delta, ptsdelta, seg, startseg;

+

+    for (i = 0; i < 4; i++)

+	arcPts[i] = points + (i * maxPts);

+    (void)miZeroArcSetup(arc, &info, FALSE);

+    MIARCSETUP();

+    mask = info.initialMask;

+    startseg = info.startAngle / QUADRANT;

+    startPt = arcPts[startseg];

+    if (!(arc->width & 1))

+    {

+	DoPix(1, info.xorgo, info.yorg);

+	DoPix(3, info.xorgo, info.yorgo);

+    }

+    if (!info.end.x || !info.end.y)

+    {

+	mask = info.end.mask;

+	info.end = info.altend;

+    }

+    while (y < info.h || x < info.w)

+    {

+	MIARCOCTANTSHIFT(;);

+	if ((x == info.firstx) || (y == info.firsty))

+	    startPt = arcPts[startseg];

+	if ((x == info.start.x) || (y == info.start.y))

+	{

+	    mask = info.start.mask;

+	    info.start = info.altstart;

+	}

+	DoPix(0, info.xorg + x, info.yorg + y);

+	DoPix(1, info.xorgo - x, info.yorg + y);

+	DoPix(2, info.xorgo - x, info.yorgo - y);

+	DoPix(3, info.xorg + x, info.yorgo - y);

+	if ((x == info.end.x) || (y == info.end.y))

+	{

+	    mask = info.end.mask;

+	    info.end = info.altend;

+	}

+	MIARCSTEP(;,;);

+    }

+    if ((x == info.firstx) || (y == info.firsty))

+	startPt = arcPts[startseg];

+    if ((x == info.start.x) || (y == info.start.y))

+	mask = info.start.mask;

+    DoPix(0, info.xorg + x, info.yorg + y);

+    DoPix(2, info.xorgo - x, info.yorgo - y);

+    if (arc->height & 1)

+    {

+	DoPix(1, info.xorgo - x, info.yorg + y);

+	DoPix(3, info.xorg + x, info.yorgo - y);

+    }

+    for (i = 0; i < 4; i++)

+    {

+	seg = (startseg + i) & 3;

+	pt = points + (seg * maxPts);

+	if (seg & 1)

+	{

+	    startPts[i] = pt;

+	    endPts[i] = arcPts[seg];

+	    deltas[i] = 1;

+	}

+	else

+	{

+	    startPts[i] = arcPts[seg] - 1;

+	    endPts[i] = pt - 1;

+	    deltas[i] = -1;

+	}

+    }

+    startPts[4] = startPts[0];

+    endPts[4] = startPt;

+    startPts[0] = startPt;

+    if (startseg & 1)

+    {

+	if (startPts[4] != endPts[4])

+	    endPts[4]--;

+	deltas[4] = 1;

+    }

+    else

+    {

+	if (startPts[0] > startPts[4])

+	    startPts[0]--;

+	if (startPts[4] < endPts[4])

+	    endPts[4]--;

+	deltas[4] = -1;

+    }

+    if (arc->angle2 < 0)

+    {

+	DDXPointPtr tmps, tmpe;

+	int tmpd;

+

+	tmpd = deltas[0];

+	tmps = startPts[0] - tmpd;

+	tmpe = endPts[0] - tmpd;

+	startPts[0] = endPts[4] - deltas[4];

+	endPts[0] = startPts[4] - deltas[4];

+	deltas[0] = -deltas[4];

+	startPts[4] = tmpe;

+	endPts[4] = tmps;

+	deltas[4] = -tmpd;

+	tmpd = deltas[1];

+	tmps = startPts[1] - tmpd;

+	tmpe = endPts[1] - tmpd;

+	startPts[1] = endPts[3] - deltas[3];

+	endPts[1] = startPts[3] - deltas[3];

+	deltas[1] = -deltas[3];

+	startPts[3] = tmpe;

+	endPts[3] = tmps;

+	deltas[3] = -tmpd;

+	tmps = startPts[2] - deltas[2];

+	startPts[2] = endPts[2] - deltas[2];

+	endPts[2] = tmps;

+	deltas[2] = -deltas[2];

+    }

+    for (i = 0; i < 5 && startPts[i] == endPts[i]; i++)

+	;

+    if (i == 5)

+	return;

+    pt = startPts[i];

+    for (j = 4; startPts[j] == endPts[j]; j--)

+	;

+    lastPt = endPts[j] - deltas[j];

+    if (dinfo->haveLast &&

+	(pt->x == dinfo->endPt.x) && (pt->y == dinfo->endPt.y))

+    {

+	startPts[i] += deltas[i];

+    }

+    else

+    {

+	dinfo->dashIndex = dinfo->dashIndexInit;

+	dinfo->dashOffset = dinfo->dashOffsetInit;

+    }

+    if (!dinfo->skipStart && (info.startAngle != info.endAngle))

+    {

+	dinfo->startPt = *pt;

+	dinfo->haveStart = TRUE;

+    }

+    else if (!dinfo->skipLast && dinfo->haveStart &&

+	     (lastPt->x == dinfo->startPt.x) &&

+	     (lastPt->y == dinfo->startPt.y) &&

+	     (lastPt != startPts[i]))

+	endPts[j] = lastPt;

+    if (info.startAngle != info.endAngle)

+    {

+	dinfo->haveLast = TRUE;

+	dinfo->endPt = *lastPt;

+    }

+    dashRemaining = pGC->dash[dinfo->dashIndex] - dinfo->dashOffset;

+    for (i = 0; i < 5; i++)

+    {

+	pt = startPts[i];

+	lastPt = endPts[i];

+	delta = deltas[i];

+	while (pt != lastPt)

+	{

+	    if (dinfo->dashIndex & 1)

+	    {

+		pts = *oddPts;

+		ptsdelta = -1;

+	    }

+	    else

+	    {

+		pts = *evenPts;

+		ptsdelta = 1;

+	    }

+	    while ((pt != lastPt) && --dashRemaining >= 0)

+	    {

+		*pts = *pt;

+		pts += ptsdelta;

+		pt += delta;

+	    }

+	    if (dinfo->dashIndex & 1)

+		*oddPts = pts;

+	    else

+		*evenPts = pts;

+	    if (dashRemaining <= 0)

+	    {

+		if (++(dinfo->dashIndex) == pGC->numInDashList)

+		    dinfo->dashIndex = 0;

+		dashRemaining = pGC->dash[dinfo->dashIndex];

+	    }

+	}

+    }

+    dinfo->dashOffset = pGC->dash[dinfo->dashIndex] - dashRemaining;

+}

+

+void

+miZeroPolyArc(DrawablePtr pDraw, GCPtr pGC, int narcs, xArc *parcs)

+{

+    int maxPts = 0;

+    int n, maxw = 0;

+    xArc *arc;

+    int i;

+    DDXPointPtr points, pts, oddPts = NULL;

+    DDXPointPtr pt;

+    int numPts;

+    Bool dospans;

+    int *widths = NULL;

+    XID fgPixel = pGC->fgPixel;

+    DashInfo dinfo;

+

+    for (arc = parcs, i = narcs; --i >= 0; arc++)

+    {

+	if (!miCanZeroArc(arc))

+	    miPolyArc(pDraw, pGC, 1, arc);

+	else

+	{

+	    if (arc->width > arc->height)

+		n = arc->width + (arc->height >> 1);

+	    else

+		n = arc->height + (arc->width >> 1);

+	    if (n > maxPts)

+		maxPts = n;

+	}

+    }

+    if (!maxPts)

+	return;

+    numPts = maxPts << 2;

+    dospans = (pGC->fillStyle != FillSolid);

+    if (dospans)

+    {

+	widths = malloc(sizeof(int) * numPts);

+	if (!widths)

+	    return;

+	maxw = 0;

+    }

+    if (pGC->lineStyle != LineSolid)

+    {

+	numPts <<= 1;

+	dinfo.haveStart = FALSE;

+	dinfo.skipStart = FALSE;

+	dinfo.haveLast = FALSE;

+	dinfo.dashIndexInit = 0;

+	dinfo.dashOffsetInit = 0;

+	miStepDash((int)pGC->dashOffset, &dinfo.dashIndexInit,

+		   (unsigned char *) pGC->dash, (int)pGC->numInDashList,

+		   &dinfo.dashOffsetInit);

+    }

+    points = malloc(sizeof(DDXPointRec) * numPts);

+    if (!points)

+    {

+	if (dospans)

+	{

+	    free(widths);

+	}

+	return;

+    }

+    for (arc = parcs, i = narcs; --i >= 0; arc++)

+    {

+	if (miCanZeroArc(arc))

+	{

+	    if (pGC->lineStyle == LineSolid)

+		pts = miZeroArcPts(arc, points);

+	    else

+	    {

+		pts = points;

+		oddPts = &points[(numPts >> 1) - 1];

+		dinfo.skipLast = i;

+		miZeroArcDashPts(pGC, arc, &dinfo,

+				 oddPts + 1, maxPts, &pts, &oddPts);

+		dinfo.skipStart = TRUE;

+	    }

+	    n = pts - points;

+	    if (!dospans)

+		(*pGC->ops->PolyPoint)(pDraw, pGC, CoordModeOrigin, n, points);

+	    else

+	    {

+		if (n > maxw)

+		{

+		    while (maxw < n)

+			widths[maxw++] = 1;

+		}

+		if (pGC->miTranslate)

+		{

+		    for (pt = points; pt != pts; pt++)

+		    {

+			pt->x += pDraw->x;

+			pt->y += pDraw->y;

+		    }

+		}

+		(*pGC->ops->FillSpans)(pDraw, pGC, n, points, widths, FALSE);

+	    }

+	    if (pGC->lineStyle != LineDoubleDash)

+		continue;

+	    if ((pGC->fillStyle == FillSolid) ||

+		(pGC->fillStyle == FillStippled))

+	    {

+		ChangeGCVal gcval;

+		gcval.val = pGC->bgPixel;

+		ChangeGC(NullClient, pGC, GCForeground, &gcval);

+		ValidateGC(pDraw, pGC);

+	    }

+	    pts = &points[numPts >> 1];

+	    oddPts++;

+	    n = pts - oddPts;

+	    if (!dospans)

+		(*pGC->ops->PolyPoint)(pDraw, pGC, CoordModeOrigin, n, oddPts);

+	    else

+	    {

+		if (n > maxw)

+		{

+		    while (maxw < n)

+			widths[maxw++] = 1;

+		}

+		if (pGC->miTranslate)

+		{

+		    for (pt = oddPts; pt != pts; pt++)

+		    {

+			pt->x += pDraw->x;

+			pt->y += pDraw->y;

+		    }

+		}

+		(*pGC->ops->FillSpans)(pDraw, pGC, n, oddPts, widths, FALSE);

+	    }

+	    if ((pGC->fillStyle == FillSolid) ||

+		(pGC->fillStyle == FillStippled))

+	    {

+		ChangeGCVal gcval;

+		gcval.val = fgPixel;

+		ChangeGC(NullClient, pGC, GCForeground, &gcval);

+		ValidateGC(pDraw, pGC);

+	    }

+	}

+    }

+    free(points);

+    if (dospans)

+    {

+	free(widths);

+    }

+}