mizerarc.c

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    {
	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(pGC, arc, dinfo, points, maxPts, evenPts, oddPts)
    GCPtr pGC;
    xArc *arc;
    DashInfo *dinfo;
    int maxPts;
    register DDXPointPtr points, *evenPts, *oddPts;
{
    miZeroArcRec info;
    register int x, y, a, b, d, mask;
    register 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(pDraw, pGC, narcs, parcs)
    DrawablePtr	pDraw;
    GCPtr	pGC;
    int		narcs;
    xArc	*parcs;
{
    int maxPts = 0;
    register int n, maxw;
    register xArc *arc;
    register int i;
    DDXPointPtr points, pts, oddPts;
    register DDXPointPtr pt;
    int numPts;
    Bool dospans;
    int *widths;
    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->lineStyle != LineSolid) || (pGC->fillStyle != FillSolid);
    if (dospans)
    {
	widths = (int *)ALLOCATE_LOCAL(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 = (DDXPointPtr)ALLOCATE_LOCAL(sizeof(DDXPointRec) * numPts);
    if (!points)
    {
	if (dospans)
	{
	    DEALLOCATE_LOCAL(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);
	    }
	}
    }
    DEALLOCATE_LOCAL(points);
    if (dospans)
    {
	DEALLOCATE_LOCAL(widths);
    }
}