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#ifndef lint |
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static const char RCSid[] = "$Id: ra_hexbit.c,v 3.2 2003/02/22 02:07:27 greg Exp $"; |
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#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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|
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#include <stdio.h> |
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#include <time.h> |
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|
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#include "color.h" |
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#include "resolu.h" |
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|
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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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|
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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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|
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static void quiterr(char *err); |
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static void ra2hex(void); |
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|
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|
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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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{ |
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int i; |
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|
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progname = argv[0]; |
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|
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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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|
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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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} |
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|
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|
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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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{ |
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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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exit(0); |
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} |
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|
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|
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static void |
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ra2hex(void) /* convert Radiance scanlines to 4x1 bit hex */ |
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{ |
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static char cmap[] = "0123456789ABCDEF"; |
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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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/* allocate scanline */ |
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scanin = (COLR *)malloc(xmax*sizeof(COLR)); |
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if (scanin == NULL) |
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quiterr("out of memory in ra2skel"); |
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/* convert image */ |
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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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quiterr("error reading Radiance picture"); |
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c = 0; |
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for (x = 0; x < xmax; x++) |
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if ((t = 03 - (x&03))) |
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c |= abovethresh(scanin[x]) << t; |
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else { |
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c |= abovethresh(scanin[x]); |
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putchar(cmap[c]); |
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c = 0; |
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} |
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if (t) |
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fputc(cmap[c], stdout); |
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fputc('\n', stdout); |
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if (ferror(stdout)) |
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quiterr("error writing hex bit file"); |
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} |
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/* free scanline */ |
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free((void *)scanin); |
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} |
