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+/* $XFree86: xc/programs/Xserver/mi/mizerarc.c,v 1.6 2001/12/14 20:00:28 dawes Exp $ */
+/************************************************************
+
+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
+
+********************************************************/
+
+/* $Xorg: mizerarc.c,v 1.4 2001/02/09 02:05:22 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
+ */
+
+#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(arc, info, ok360)
+ register xArc *arc;
+ register 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);
+
+DDXPointPtr
+miZeroArcPts(arc, pts)
+ xArc *arc;
+ register DDXPointPtr pts;
+{
+ miZeroArcRec info;
+ register int x, y, a, b, d, mask;
+ register 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,
+ register DDXPointPtr points,
+ int maxPts,
+ register DDXPointPtr *evenPts,
+ register DDXPointPtr *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 = 0;
+ register xArc *arc;
+ register int i;
+ DDXPointPtr points, pts, oddPts;
+ register 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 = (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);
+ }
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-05 18:29:50 +0000