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-rw-r--r--do_segs.c402
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+/* $Xorg: do_segs.c,v 1.3 2000/08/17 19:54:09 cpqbld Exp $ */
+/*****************************************************************************
+Copyright 1988, 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.
+
+******************************************************************************/
+
+#include "x11perf.h"
+
+static XSegment *segments;
+static GC pgc;
+
+static void GenerateSegments(xp, p, ddashed)
+ XParms xp;
+ Parms p;
+ Bool ddashed;
+{
+ int size;
+ int half;
+ int i;
+ int rows; /* Number of rows filled in current column */
+ int x, y; /* base of square to draw in */
+ int x1, y1, x2, y2; /* offsets into square */
+ int phase; /* how far into 0..8*size we are */
+ int phaseinc; /* how much to increment phase at each segment */
+ int size8; /* 8 * size */
+ XGCValues gcv;
+
+ if(ddashed)
+ pgc = xp->ddfggc;
+ else
+ pgc = xp->fggc;
+
+
+ size = p->special;
+ size8 = 8 * size;
+ half = (size + 19) / 20;
+
+ segments = (XSegment *)malloc((p->objects) * sizeof(XSegment));
+
+ /* All this x, x1, etc. stuff is to create a pattern that
+ (1) scans down the screen vertically, with each new segment going
+ into a square of size^2.
+
+ (2) rotates the endpoints clockwise around the square
+
+ (3) rotates by ``large'' steps if we aren't going to paint enough
+ segments to get full coverage
+
+ (4) uses CapNotLast so we can create segments of length 1 that
+ nonetheless have a distinct direction
+ */
+
+ x = half; y = half;
+ phase = 0;
+ phaseinc = size8 / p->objects;
+ if (phaseinc == 0) phaseinc = 1;
+ rows = 0;
+
+ for (i = 0; i != p->objects; i++) {
+ switch (phase / size) {
+ case 0:
+ x1 = 0;
+ y1 = 0;
+ x2 = size;
+ y2 = phase;
+ break;
+
+ case 1:
+ x1 = phase % size;
+ y1 = 0;
+ x2 = size;
+ y2 = size;
+ break;
+
+ case 2:
+ x1 = size;
+ y1 = 0;
+ x2 = size - phase % size;
+ y2 = size;
+ break;
+
+ case 3:
+ x1 = size;
+ y1 = phase % size;
+ x2 = 0;
+ y2 = size;
+ break;
+
+ case 4:
+ x1 = size;
+ y1 = size;
+ x2 = 0;
+ y2 = size - phase % size;
+ break;
+
+ case 5:
+ x1 = size - phase % size;
+ y1 = size;
+ x2 = 0;
+ y2 = 0;
+ break;
+
+ case 6:
+ x1 = 0;
+ y1 = size;
+ x2 = phase % size;
+ y2 = 0;
+ break;
+
+ case 7:
+ x1 = 0;
+ y1 = size - phase % size;
+ x2 = size;
+ y2 = 0;
+ break;
+ } /* end switch */
+
+ segments[i].x1 = x + x1;
+ segments[i].y1 = y + y1;
+ segments[i].x2 = x + x2;
+ segments[i].y2 = y + y2;
+
+ /* Change square to draw segment in */
+ rows++;
+ y += size;
+ if (y >= HEIGHT - size - half || rows == MAXROWS) {
+ /* Go to next column */
+ rows = 0;
+ y = half;
+ x += size;
+ if (x >= WIDTH - size - half) {
+ x = half;
+ }
+ }
+
+ /* Increment phase */
+ phase += phaseinc;
+ if (phase >= size8) phase -= size8;
+
+ }
+
+ gcv.cap_style = CapNotLast;
+
+ if(ddashed) {
+ XChangeGC(xp->d, xp->ddfggc, GCCapStyle, &gcv);
+ XChangeGC(xp->d, xp->ddbggc, GCCapStyle, &gcv);
+ } else {
+ XChangeGC(xp->d, xp->fggc, GCCapStyle, &gcv);
+ XChangeGC(xp->d, xp->bggc, GCCapStyle, &gcv);
+ }
+}
+
+int InitSegments(xp, p, reps)
+ XParms xp;
+ Parms p;
+ int reps;
+{
+ GenerateSegments(xp, p, False);
+ return reps;
+}
+
+int InitDashedSegments(xp, p, reps)
+ XParms xp;
+ Parms p;
+ int reps;
+{
+ char dashes[2];
+
+ GenerateSegments(xp, p, False);
+
+ /* Modify GCs to draw dashed */
+ XSetLineAttributes
+ (xp->d, xp->bggc, 0, LineOnOffDash, CapNotLast, JoinMiter);
+ XSetLineAttributes
+ (xp->d, xp->fggc, 0, LineOnOffDash, CapNotLast, JoinMiter);
+ dashes[0] = 3; dashes[1] = 2;
+ XSetDashes(xp->d, xp->fggc, 0, dashes, 2);
+ XSetDashes(xp->d, xp->bggc, 0, dashes, 2);
+ return reps;
+}
+
+int InitDoubleDashedSegments(xp, p, reps)
+ XParms xp;
+ Parms p;
+ int reps;
+{
+ char dashes[2];
+
+ GenerateSegments(xp, p, True);
+
+ /* Modify GCs to draw dashed */
+ XSetLineAttributes
+ (xp->d, xp->ddbggc, 0, LineDoubleDash, CapNotLast, JoinMiter);
+ XSetLineAttributes
+ (xp->d, xp->ddfggc, 0, LineDoubleDash, CapNotLast, JoinMiter);
+ dashes[0] = 3; dashes[1] = 2;
+ XSetDashes(xp->d, xp->ddfggc, 0, dashes, 2);
+ XSetDashes(xp->d, xp->ddbggc, 0, dashes, 2);
+ return reps;
+}
+
+int InitHorizSegments(xp, p, reps)
+ XParms xp;
+ Parms p;
+ int reps;
+{
+ int size;
+ int half;
+ int i;
+ int rows; /* Number of rows filled in current column */
+ int x, y; /* base of square to draw in */
+ int y1; /* y position inside square */
+ int inc;
+ XGCValues gcv;
+
+ pgc = xp->fggc;
+
+ size = p->special;
+ half = (size + 19) / 20;
+
+ segments = (XSegment *)malloc((p->objects) * sizeof(XSegment));
+
+ x = half;
+ y = half;
+ y1 = 0;
+ rows = 0;
+ inc = size / p->objects;
+ if (inc == 0) inc = 1;
+
+ for (i = 0; i != p->objects; i++) {
+ if (i % 2) {
+ segments[i].x1 = x + size;
+ segments[i].x2 = x;
+ segments[i].y1 = y + size - y1;
+ segments[i].y2 = y + size - y1;
+ y1 += inc;
+ if (y1 >= size) y1 -= size;
+ } else {
+ segments[i].x1 = x;
+ segments[i].x2 = x + size;
+ segments[i].y1 = y + y1;
+ segments[i].y2 = y + y1;
+ }
+ rows++;
+ y += size;
+ if (y >= HEIGHT - size - half || rows == MAXROWS) {
+ rows = 0;
+ y = half;
+ x += size;
+ if (x >= WIDTH - size - half)
+ x = half;
+ }
+ }
+ gcv.cap_style = CapNotLast;
+ XChangeGC(xp->d, xp->fggc, GCCapStyle, &gcv);
+ XChangeGC(xp->d, xp->bggc, GCCapStyle, &gcv);
+ return reps;
+}
+
+int InitWideHorizSegments(xp, p, reps)
+ XParms xp;
+ Parms p;
+ int reps;
+{
+ int size;
+
+ (void)InitHorizSegments(xp, p, reps);
+
+ size = p->special;
+ XSetLineAttributes(xp->d, xp->bggc, (int) ((size + 9) / 10),
+ LineSolid, CapRound, JoinRound);
+ XSetLineAttributes(xp->d, xp->fggc, (int) ((size + 9) / 10),
+ LineSolid, CapRound, JoinRound);
+
+ return reps;
+}
+
+
+int InitVertSegments(xp, p, reps)
+ XParms xp;
+ Parms p;
+ int reps;
+{
+ int size;
+ int half;
+ int i;
+ int rows; /* Number of rows filled in current column */
+ int x, y; /* base of square to draw in */
+ int x1; /* x position inside square */
+ int inc;
+ XGCValues gcv;
+
+ pgc = xp->fggc;
+
+ size = p->special;
+ half = (size + 19) / 20;
+
+ segments = (XSegment *)malloc((p->objects) * sizeof(XSegment));
+
+ x = half;
+ y = half;
+ x1 = 0;
+ rows = 0;
+ inc = size / p->objects;
+ if (inc == 0) inc = 1;
+
+ for (i = 0; i != p->objects; i++) {
+ if (i % 2) {
+ segments[i].x1 = x + size - x1;
+ segments[i].x2 = x + size - x1;
+ segments[i].y1 = y + size;
+ segments[i].y2 = y;
+ x1 += inc;
+ if (x1 >= size) x1 -= size;
+ } else {
+ segments[i].x1 = x + x1;
+ segments[i].x2 = x + x1;
+ segments[i].y1 = y;
+ segments[i].y2 = y + size;
+ }
+ rows++;
+ y += size;
+ if (y >= HEIGHT - size - half || rows == MAXROWS) {
+ /* Go to next column */
+ rows = 0;
+ y = half;
+ x += size;
+ if (x >= WIDTH - size - half) {
+ x = half;
+ }
+ }
+ }
+ gcv.cap_style = CapNotLast;
+ XChangeGC(xp->d, xp->fggc, GCCapStyle, &gcv);
+ XChangeGC(xp->d, xp->bggc, GCCapStyle, &gcv);
+ return reps;
+}
+
+int InitWideVertSegments(xp, p, reps)
+ XParms xp;
+ Parms p;
+ int reps;
+{
+ int size;
+
+ (void)InitVertSegments(xp, p, reps);
+
+ size = p->special;
+ XSetLineAttributes(xp->d, xp->bggc, (int) ((size + 9) / 10),
+ LineSolid, CapRound, JoinRound);
+ XSetLineAttributes(xp->d, xp->fggc, (int) ((size + 9) / 10),
+ LineSolid, CapRound, JoinRound);
+
+ return reps;
+}
+
+
+void DoSegments(xp, p, reps)
+ XParms xp;
+ Parms p;
+ int reps;
+{
+ int i;
+
+ for (i = 0; i != reps; i++) {
+ XDrawSegments(xp->d, xp->w, pgc, segments, p->objects);
+ if (pgc == xp->ddbggc)
+ pgc = xp->ddfggc;
+ else if(pgc == xp->ddfggc)
+ pgc = xp->ddbggc;
+ else if (pgc == xp->bggc)
+ pgc = xp->fggc;
+ else
+ pgc = xp->bggc;
+ }
+}
+
+void EndSegments(xp, p)
+ XParms xp;
+ Parms p;
+{
+ free(segments);
+}
+
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