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gwlarson |
3.1 |
#ifndef lint
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| 2 |
schorsch |
3.3 |
static const char RCSid[] = "$Id: ra_hexbit.c,v 3.2 2003/02/22 02:07:27 greg Exp $";
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| 3 |
gwlarson |
3.1 |
#endif
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/*
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* Create a 4x1 hex bitmap from a Radiance picture.
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*/
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#include <stdio.h>
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| 9 |
greg |
3.2 |
#include <time.h>
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schorsch |
3.3 |
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gwlarson |
3.1 |
#include "color.h"
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#include "resolu.h"
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char *progname;
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int xmax, ymax;
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double thresh = 0.5; /* threshold value */
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COLR threshclr;
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#define abovethresh(c) ((c)[EXP]>threshclr[EXP] || \
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((c)[EXP]==threshclr[EXP] && (c)[GRN]>threshclr[GRN]))
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schorsch |
3.3 |
static void quiterr(char *err);
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static void ra2hex(void);
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gwlarson |
3.1 |
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schorsch |
3.3 |
int
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main(
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int argc,
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char *argv[]
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)
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gwlarson |
3.1 |
{
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int i;
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progname = argv[0];
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for (i = 1; i < argc; i++)
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if (argv[i][0] == '-')
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switch (argv[i][1]) {
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case 't': /* threshold value */
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thresh = atof(argv[++i]);
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break;
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default:
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goto userr;
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}
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else
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break;
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if (i < argc-2)
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goto userr;
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if (i <= argc-1 && freopen(argv[i], "r", stdin) == NULL) {
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fprintf(stderr, "%s: can't open input \"%s\"\n",
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progname, argv[i]);
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exit(1);
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}
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if (i == argc-2 && freopen(argv[i+1], "w", stdout) == NULL) {
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fprintf(stderr, "%s: can't open output \"%s\"\n",
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progname, argv[i+1]);
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exit(1);
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}
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/* assign threshold color */
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setcolr(threshclr, thresh, thresh, thresh);
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/* get our header */
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if (checkheader(stdin, COLRFMT, NULL) < 0 ||
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fgetresolu(&xmax, &ymax, stdin) < 0)
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quiterr("bad picture format");
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/* convert file */
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ra2hex();
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exit(0);
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userr:
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fprintf(stderr,
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"Usage: %s [-t thresh] [input [output]]\n", progname);
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exit(1);
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| 73 |
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}
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schorsch |
3.3 |
static void
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quiterr( /* print message and exit */
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char *err
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)
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| 80 |
gwlarson |
3.1 |
{
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if (err != NULL) {
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fprintf(stderr, "%s: %s\n", progname, err);
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exit(1);
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}
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| 85 |
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exit(0);
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| 86 |
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}
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| 88 |
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| 89 |
schorsch |
3.3 |
static void
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| 90 |
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ra2hex(void) /* convert Radiance scanlines to 4x1 bit hex */
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| 91 |
gwlarson |
3.1 |
{
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| 92 |
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static char cmap[] = "0123456789ABCDEF";
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| 93 |
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COLR *scanin;
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register int x, c, t;
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int y;
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| 96 |
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/* allocate scanline */
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scanin = (COLR *)malloc(xmax*sizeof(COLR));
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| 98 |
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if (scanin == NULL)
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quiterr("out of memory in ra2skel");
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| 100 |
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/* convert image */
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| 101 |
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for (y = ymax-1; y >= 0; y--) {
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if (freadcolrs(scanin, xmax, stdin) < 0)
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| 103 |
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quiterr("error reading Radiance picture");
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| 104 |
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c = 0;
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| 105 |
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for (x = 0; x < xmax; x++)
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| 106 |
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if ((t = 03 - (x&03)))
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| 107 |
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c |= abovethresh(scanin[x]) << t;
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| 108 |
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else {
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| 109 |
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c |= abovethresh(scanin[x]);
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| 110 |
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putchar(cmap[c]);
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| 111 |
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c = 0;
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| 112 |
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}
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| 113 |
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if (t)
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| 114 |
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fputc(cmap[c], stdout);
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| 115 |
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fputc('\n', stdout);
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| 116 |
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if (ferror(stdout))
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| 117 |
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quiterr("error writing hex bit file");
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| 118 |
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}
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| 119 |
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/* free scanline */
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| 120 |
greg |
3.2 |
free((void *)scanin);
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| 121 |
gwlarson |
3.1 |
}
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