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+/***********************************************************
+
+Copyright 1989, 1998 The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of The Open Group shall not be
+used in advertising or otherwise to promote the sale, use or other dealings
+in this Software without prior written authorization from The Open Group.
+
+
+Copyright 1989 by Digital Equipment Corporation, Maynard, Massachusetts.
+
+ All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted,
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in
+supporting documentation, and that the name of Digital not be
+used in advertising or publicity pertaining to distribution of the
+software without specific, written prior permission.
+
+DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
+ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
+DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
+ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+SOFTWARE.
+
+******************************************************************/
+
+/* $Xorg: mispans.c,v 1.4 2001/02/09 02:05:21 xorgcvs Exp $ */
+
+#include "misc.h"
+#include "pixmapstr.h"
+#include "gcstruct.h"
+#include "mispans.h"
+
+/*
+
+These routines maintain lists of Spans, in order to implement the
+``touch-each-pixel-once'' rules of wide lines and arcs.
+
+Written by Joel McCormack, Summer 1989.
+
+*/
+
+
+void miInitSpanGroup(spanGroup)
+ SpanGroup *spanGroup;
+{
+ spanGroup->size = 0;
+ spanGroup->count = 0;
+ spanGroup->group = NULL;
+ spanGroup->ymin = MAXSHORT;
+ spanGroup->ymax = MINSHORT;
+} /* InitSpanGroup */
+
+#define YMIN(spans) (spans->points[0].y)
+#define YMAX(spans) (spans->points[spans->count-1].y)
+
+void miSubtractSpans (spanGroup, sub)
+ SpanGroup *spanGroup;
+ Spans *sub;
+{
+ int i, subCount, spansCount;
+ int ymin, ymax, xmin, xmax;
+ Spans *spans;
+ DDXPointPtr subPt, spansPt;
+ int *subWid, *spansWid;
+ int extra;
+
+ ymin = YMIN(sub);
+ ymax = YMAX(sub);
+ spans = spanGroup->group;
+ for (i = spanGroup->count; i; i--, spans++) {
+ if (YMIN(spans) <= ymax && ymin <= YMAX(spans)) {
+ subCount = sub->count;
+ subPt = sub->points;
+ subWid = sub->widths;
+ spansCount = spans->count;
+ spansPt = spans->points;
+ spansWid = spans->widths;
+ extra = 0;
+ for (;;)
+ {
+ while (spansCount && spansPt->y < subPt->y)
+ {
+ spansPt++; spansWid++; spansCount--;
+ }
+ if (!spansCount)
+ break;
+ while (subCount && subPt->y < spansPt->y)
+ {
+ subPt++; subWid++; subCount--;
+ }
+ if (!subCount)
+ break;
+ if (subPt->y == spansPt->y)
+ {
+ xmin = subPt->x;
+ xmax = xmin + *subWid;
+ if (xmin >= spansPt->x + *spansWid || spansPt->x >= xmax)
+ {
+ ;
+ }
+ else if (xmin <= spansPt->x)
+ {
+ if (xmax >= spansPt->x + *spansWid)
+ {
+ memmove (spansPt, spansPt + 1, sizeof *spansPt * (spansCount - 1));
+ memmove (spansWid, spansWid + 1, sizeof *spansWid * (spansCount - 1));
+ spansPt--;
+ spansWid--;
+ spans->count--;
+ extra++;
+ }
+ else
+ {
+ *spansWid = *spansWid - (xmax - spansPt->x);
+ spansPt->x = xmax;
+ }
+ }
+ else
+ {
+ if (xmax >= spansPt->x + *spansWid)
+ {
+ *spansWid = xmin - spansPt->x;
+ }
+ else
+ {
+ if (!extra) {
+ DDXPointPtr newPt;
+ int *newwid;
+
+#define EXTRA 8
+ newPt = (DDXPointPtr) xrealloc (spans->points, (spans->count + EXTRA) * sizeof (DDXPointRec));
+ if (!newPt)
+ break;
+ spansPt = newPt + (spansPt - spans->points);
+ spans->points = newPt;
+ newwid = (int *) xrealloc (spans->widths, (spans->count + EXTRA) * sizeof (int));
+ if (!newwid)
+ break;
+ spansWid = newwid + (spansWid - spans->widths);
+ spans->widths = newwid;
+ extra = EXTRA;
+ }
+ memmove (spansPt + 1, spansPt, sizeof *spansPt * (spansCount));
+ memmove (spansWid + 1, spansWid, sizeof *spansWid * (spansCount));
+ spans->count++;
+ extra--;
+ *spansWid = xmin - spansPt->x;
+ spansWid++;
+ spansPt++;
+ *spansWid = *spansWid - (xmax - spansPt->x);
+ spansPt->x = xmax;
+ }
+ }
+ }
+ spansPt++; spansWid++; spansCount--;
+ }
+ }
+ }
+}
+
+void miAppendSpans(spanGroup, otherGroup, spans)
+ SpanGroup *spanGroup;
+ SpanGroup *otherGroup;
+ Spans *spans;
+{
+ register int ymin, ymax;
+ register int spansCount;
+
+ spansCount = spans->count;
+ if (spansCount > 0) {
+ if (spanGroup->size == spanGroup->count) {
+ spanGroup->size = (spanGroup->size + 8) * 2;
+ spanGroup->group = (Spans *)
+ xrealloc(spanGroup->group, sizeof(Spans) * spanGroup->size);
+ }
+
+ spanGroup->group[spanGroup->count] = *spans;
+ (spanGroup->count)++;
+ ymin = spans->points[0].y;
+ if (ymin < spanGroup->ymin) spanGroup->ymin = ymin;
+ ymax = spans->points[spansCount - 1].y;
+ if (ymax > spanGroup->ymax) spanGroup->ymax = ymax;
+ if (otherGroup &&
+ otherGroup->ymin < ymax &&
+ ymin < otherGroup->ymax)
+ {
+ miSubtractSpans (otherGroup, spans);
+ }
+ }
+ else
+ {
+ xfree (spans->points);
+ xfree (spans->widths);
+ }
+} /* AppendSpans */
+
+void miFreeSpanGroup(spanGroup)
+ SpanGroup *spanGroup;
+{
+ if (spanGroup->group != NULL) xfree(spanGroup->group);
+}
+
+static void QuickSortSpansX(points, widths, numSpans)
+ register DDXPointRec points[];
+ register int widths[];
+ register int numSpans;
+{
+ register int x;
+ register int i, j, m;
+ register DDXPointPtr r;
+
+/* Always called with numSpans > 1 */
+/* Sorts only by x, as all y should be the same */
+
+#define ExchangeSpans(a, b) \
+{ \
+ DDXPointRec tpt; \
+ register int tw; \
+ \
+ tpt = points[a]; points[a] = points[b]; points[b] = tpt; \
+ tw = widths[a]; widths[a] = widths[b]; widths[b] = tw; \
+}
+
+ do {
+ if (numSpans < 9) {
+ /* Do insertion sort */
+ register int xprev;
+
+ xprev = points[0].x;
+ i = 1;
+ do { /* while i != numSpans */
+ x = points[i].x;
+ if (xprev > x) {
+ /* points[i] is out of order. Move into proper location. */
+ DDXPointRec tpt;
+ int tw, k;
+
+ for (j = 0; x >= points[j].x; j++) {}
+ tpt = points[i];
+ tw = widths[i];
+ for (k = i; k != j; k--) {
+ points[k] = points[k-1];
+ widths[k] = widths[k-1];
+ }
+ points[j] = tpt;
+ widths[j] = tw;
+ x = points[i].x;
+ } /* if out of order */
+ xprev = x;
+ i++;
+ } while (i != numSpans);
+ return;
+ }
+
+ /* Choose partition element, stick in location 0 */
+ m = numSpans / 2;
+ if (points[m].x > points[0].x) ExchangeSpans(m, 0);
+ if (points[m].x > points[numSpans-1].x) ExchangeSpans(m, numSpans-1);
+ if (points[m].x > points[0].x) ExchangeSpans(m, 0);
+ x = points[0].x;
+
+ /* Partition array */
+ i = 0;
+ j = numSpans;
+ do {
+ r = &(points[i]);
+ do {
+ r++;
+ i++;
+ } while (i != numSpans && r->x < x);
+ r = &(points[j]);
+ do {
+ r--;
+ j--;
+ } while (x < r->x);
+ if (i < j) ExchangeSpans(i, j);
+ } while (i < j);
+
+ /* Move partition element back to middle */
+ ExchangeSpans(0, j);
+
+ /* Recurse */
+ if (numSpans-j-1 > 1)
+ QuickSortSpansX(&points[j+1], &widths[j+1], numSpans-j-1);
+ numSpans = j;
+ } while (numSpans > 1);
+} /* QuickSortSpans */
+
+
+static int UniquifySpansX(spans, newPoints, newWidths)
+ Spans *spans;
+ register DDXPointRec *newPoints;
+ register int *newWidths;
+{
+ register int newx1, newx2, oldpt, i, y;
+ register DDXPointRec *oldPoints;
+ register int *oldWidths;
+ int *startNewWidths;
+
+/* Always called with numSpans > 1 */
+/* Uniquify the spans, and stash them into newPoints and newWidths. Return the
+ number of unique spans. */
+
+
+ startNewWidths = newWidths;
+
+ oldPoints = spans->points;
+ oldWidths = spans->widths;
+
+ y = oldPoints->y;
+ newx1 = oldPoints->x;
+ newx2 = newx1 + *oldWidths;
+
+ for (i = spans->count-1; i != 0; i--) {
+ oldPoints++;
+ oldWidths++;
+ oldpt = oldPoints->x;
+ if (oldpt > newx2) {
+ /* Write current span, start a new one */
+ newPoints->x = newx1;
+ newPoints->y = y;
+ *newWidths = newx2 - newx1;
+ newPoints++;
+ newWidths++;
+ newx1 = oldpt;
+ newx2 = oldpt + *oldWidths;
+ } else {
+ /* extend current span, if old extends beyond new */
+ oldpt = oldpt + *oldWidths;
+ if (oldpt > newx2) newx2 = oldpt;
+ }
+ } /* for */
+
+ /* Write final span */
+ newPoints->x = newx1;
+ *newWidths = newx2 - newx1;
+ newPoints->y = y;
+
+ return (newWidths - startNewWidths) + 1;
+} /* UniquifySpansX */
+
+void
+miDisposeSpanGroup (spanGroup)
+ SpanGroup *spanGroup;
+{
+ int i;
+ Spans *spans;
+
+ for (i = 0; i < spanGroup->count; i++)
+ {
+ spans = spanGroup->group + i;
+ xfree (spans->points);
+ xfree (spans->widths);
+ }
+}
+
+void miFillUniqueSpanGroup(pDraw, pGC, spanGroup)
+ DrawablePtr pDraw;
+ GCPtr pGC;
+ SpanGroup *spanGroup;
+{
+ register int i;
+ register Spans *spans;
+ register Spans *yspans;
+ register int *ysizes;
+ register int ymin, ylength;
+
+ /* Outgoing spans for one big call to FillSpans */
+ register DDXPointPtr points;
+ register int *widths;
+ register int count;
+
+ if (spanGroup->count == 0) return;
+
+ if (spanGroup->count == 1) {
+ /* Already should be sorted, unique */
+ spans = spanGroup->group;
+ (*pGC->ops->FillSpans)
+ (pDraw, pGC, spans->count, spans->points, spans->widths, TRUE);
+ xfree(spans->points);
+ xfree(spans->widths);
+ }
+ else
+ {
+ /* Yuck. Gross. Radix sort into y buckets, then sort x and uniquify */
+ /* This seems to be the fastest thing to do. I've tried sorting on
+ both x and y at the same time rather than creating into all those
+ y buckets, but it was somewhat slower. */
+
+ ymin = spanGroup->ymin;
+ ylength = spanGroup->ymax - ymin + 1;
+
+ /* Allocate Spans for y buckets */
+ yspans = (Spans *) xalloc(ylength * sizeof(Spans));
+ ysizes = (int *) xalloc(ylength * sizeof (int));
+
+ if (!yspans || !ysizes)
+ {
+ xfree (yspans);
+ xfree (ysizes);
+ miDisposeSpanGroup (spanGroup);
+ return;
+ }
+
+ for (i = 0; i != ylength; i++) {
+ ysizes[i] = 0;
+ yspans[i].count = 0;
+ yspans[i].points = NULL;
+ yspans[i].widths = NULL;
+ }
+
+ /* Go through every single span and put it into the correct bucket */
+ count = 0;
+ for (i = 0, spans = spanGroup->group;
+ i != spanGroup->count;
+ i++, spans++) {
+ int index;
+ int j;
+
+ for (j = 0, points = spans->points, widths = spans->widths;
+ j != spans->count;
+ j++, points++, widths++) {
+ index = points->y - ymin;
+ if (index >= 0 && index < ylength) {
+ Spans *newspans = &(yspans[index]);
+ if (newspans->count == ysizes[index]) {
+ DDXPointPtr newpoints;
+ int *newwidths;
+ ysizes[index] = (ysizes[index] + 8) * 2;
+ newpoints = (DDXPointPtr) xrealloc(
+ newspans->points,
+ ysizes[index] * sizeof(DDXPointRec));
+ newwidths = (int *) xrealloc(
+ newspans->widths,
+ ysizes[index] * sizeof(int));
+ if (!newpoints || !newwidths)
+ {
+ int i;
+
+ for (i = 0; i < ylength; i++)
+ {
+ xfree (yspans[i].points);
+ xfree (yspans[i].widths);
+ }
+ xfree (yspans);
+ xfree (ysizes);
+ miDisposeSpanGroup (spanGroup);
+ return;
+ }
+ newspans->points = newpoints;
+ newspans->widths = newwidths;
+ }
+ newspans->points[newspans->count] = *points;
+ newspans->widths[newspans->count] = *widths;
+ (newspans->count)++;
+ } /* if y value of span in range */
+ } /* for j through spans */
+ count += spans->count;
+ xfree(spans->points);
+ spans->points = NULL;
+ xfree(spans->widths);
+ spans->widths = NULL;
+ } /* for i thorough Spans */
+
+ /* Now sort by x and uniquify each bucket into the final array */
+ points = (DDXPointPtr) xalloc(count * sizeof(DDXPointRec));
+ widths = (int *) xalloc(count * sizeof(int));
+ if (!points || !widths)
+ {
+ int i;
+
+ for (i = 0; i < ylength; i++)
+ {
+ xfree (yspans[i].points);
+ xfree (yspans[i].widths);
+ }
+ xfree (points);
+ xfree (widths);
+ xfree (yspans);
+ xfree (ysizes);
+ return;
+ }
+ count = 0;
+ for (i = 0; i != ylength; i++) {
+ int ycount = yspans[i].count;
+ if (ycount > 0) {
+ if (ycount > 1) {
+ QuickSortSpansX(yspans[i].points, yspans[i].widths, ycount);
+ count += UniquifySpansX
+ (&(yspans[i]), &(points[count]), &(widths[count]));
+ } else {
+ points[count] = yspans[i].points[0];
+ widths[count] = yspans[i].widths[0];
+ count++;
+ }
+ xfree(yspans[i].points);
+ xfree(yspans[i].widths);
+ }
+ }
+
+ (*pGC->ops->FillSpans) (pDraw, pGC, count, points, widths, TRUE);
+ xfree(points);
+ xfree(widths);
+ xfree(yspans);
+ xfree(ysizes);
+ }
+
+ spanGroup->count = 0;
+ spanGroup->ymin = MAXSHORT;
+ spanGroup->ymax = MINSHORT;
+}
+
+
+void miFillSpanGroup(pDraw, pGC, spanGroup)
+ DrawablePtr pDraw;
+ GCPtr pGC;
+ SpanGroup *spanGroup;
+{
+ register int i;
+ register Spans *spans;
+
+ for (i = 0, spans = spanGroup->group; i != spanGroup->count; i++, spans++) {
+ (*pGC->ops->FillSpans)
+ (pDraw, pGC, spans->count, spans->points, spans->widths, TRUE);
+ xfree(spans->points);
+ xfree(spans->widths);
+ }
+
+ spanGroup->count = 0;
+ spanGroup->ymin = MAXSHORT;
+ spanGroup->ymax = MINSHORT;
+} /* FillSpanGroup */
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