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Diffstat (limited to 'xorg-server/mi/mizerarc.c')
-rw-r--r--xorg-server/mi/mizerarc.c1615
1 files changed, 767 insertions, 848 deletions
diff --git a/xorg-server/mi/mizerarc.c b/xorg-server/mi/mizerarc.c
index 713d0bd04..9dac180d1 100644
--- a/xorg-server/mi/mizerarc.c
+++ b/xorg-server/mi/mizerarc.c
@@ -1,848 +1,767 @@
-/************************************************************
-
-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);
- }
-}
+/************************************************************
+
+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);
+ }
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-27 13:01:29 +0000