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/*
* bggen.c - a program that generates backgrounds for use with XV
*
* by John Bradley, University of Pennsylvania
* (bradley@cis.upenn.edu)
*
* Rev: 8/31/90
* Rev: 10/17/90 - added '-w' option
*/
/*
* Copyright 1989, 1990, 1991, 1992 by John Bradley and
* The University of Pennsylvania
*
* Permission to use, copy, and distribute for non-commercial purposes,
* is hereby granted without fee, providing that the above copyright
* notice appear in all copies and that both the copyright notice and this
* permission notice appear in supporting documentation.
*
* The software may be modified for your own purposes, but modified versions
* may not be distributed.
*
* This software is provided "as is" without any expressed or implied warranty.
*
* The author may be contacted via:
* US Mail: John Bradley
* GRASP Lab, Room 301C
* 3401 Walnut St.
* Philadelphia, PA 19104
*
* Phone: (215) 898-8813
* EMail: bradley@cis.upenn.edu
*/
#include <stdio.h>
#define DEFSIZE 1024
#define MAXCOLS 128
#define cols xv_cols
struct color { int r,g,b; int y; } cols[MAXCOLS], *cur, *nex;
int bmask[8] = { 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff };
main(argc,argv)
int argc;
char **argv;
{
int i,j,cnt,numcols;
int high = DEFSIZE;
int wide = 1;
int bits = 8;
int r, g, b;
#ifdef VMS
getredirection(&argc, &argv);
#endif
cnt = 0; numcols = 0;
for (i=1; i<argc; i++) {
if (!strcmp(argv[i],"-s")) high = atoi(argv[++i]);
else if (!strcmp(argv[i],"-w")) wide = atoi(argv[++i]);
else if (!strcmp(argv[i],"-b")) bits = atoi(argv[++i]);
else if (argv[i][0]=='-') break; /* any other '-' option is unknown */
else {
switch (cnt) {
case 0: cols[numcols].r = atoi(argv[i]); break;
case 1: cols[numcols].g = atoi(argv[i]); break;
case 2: cols[numcols].b = atoi(argv[i]); break;
}
cnt++;
if (cnt==3) {
if (numcols<MAXCOLS) numcols++;
cnt = 0;
}
}
}
if (cnt || numcols==0 || high<1 || bits<1 || bits>8) {
fprintf(stderr,"usage: %s [-s size] [-w width] [-b bits] %s\n\n",
argv[0], "r1 g1 b1 [r2 g2 b2 ...]");
fprintf(stderr,"\tThis will generate a WIDTHxSIZE vertical color band.\n");
fprintf(stderr,"\t(Default: 1x%d) To set your background\n",DEFSIZE);
fprintf(stderr,"\t'bits' is the number of significant bits in the\n");
fprintf(stderr,"\tcolor specifications. (1-8)\n");
fprintf(stderr,"\tpipe the resulting output into this cmd:\n");
fprintf(stderr,"\t\t'xv -root -quit -slow24 -'\n\n");
exit(1);
}
printf("P3 %d %d 255\n",wide,high);
/* special case code for numcols==1 */
if (numcols==1) {
for (i=0; i<high; i++)
for (j=0; j<wide; j++)
printf("%d %d %d\n",cols[0].r,cols[0].g,cols[0].b);
}
else {
/* fill in 'y' field of cols[] */
for (i=0; i<numcols; i++)
cols[i].y = ((high-1) * i) / (numcols-1);
cur = &cols[0]; nex = cur+1;
for (i=0; i<high; i++) {
/* advance to next pair of colors if we're outside region */
while (nex->y < i) { cur++; nex++; }
r = cur->r + ((nex->r - cur->r) * (i - cur->y)) / (nex->y - cur->y);
g = cur->g + ((nex->g - cur->g) * (i - cur->y)) / (nex->y - cur->y);
b = cur->b + ((nex->b - cur->b) * (i - cur->y)) / (nex->y - cur->y);
r = r & bmask[bits-1];
g = g & bmask[bits-1];
b = b & bmask[bits-1];
for (j=0; j<wide; j++)
printf("%d %d %d\n",r,g,b);
}
}
exit(0);
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.