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/* Copyright (c) 1986 Regents of the University of California */ |
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|
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#endif |
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|
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/* |
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* ra_bn.c - program to convert between RADIANCE and barneyscan picture format. |
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* |
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* 10/12/88 |
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*/ |
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|
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#include <stdio.h> |
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|
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#include "color.h" |
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|
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extern double atof(), pow(); |
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|
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double gamma = 2.0; /* gamma correction */ |
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|
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char *progname; |
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|
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char errmsg[128]; |
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|
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FILE *rafp, *bnfp[3]; |
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|
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int xmax, ymax; |
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|
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|
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main(argc, argv) |
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int argc; |
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char *argv[]; |
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{ |
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int reverse = 0; |
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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 'g': |
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gamma = atof(argv[++i]); |
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break; |
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case 'r': |
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reverse = !reverse; |
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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 (reverse) { |
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if (i > argc-1 || i < argc-2) |
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goto userr; |
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if (openbarney(argv[i], "r") < 0) { |
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sprintf(errmsg, "cannot open input \"%s\"", argv[i]); |
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quiterr(errmsg); |
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} |
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if (i == argc-1 || !strcmp(argv[i+1], "-")) |
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rafp = stdout; |
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else if ((rafp = fopen(argv[i+1], "w")) == NULL) { |
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sprintf(errmsg, "cannot open output \"%s\"", |
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argv[i+1]); |
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quiterr(errmsg); |
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} |
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/* put header */ |
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printargs(argc, argv, rafp); |
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putc('\n', rafp); |
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fputresolu(YMAJOR|YDECR, xmax, ymax, rafp); |
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/* convert file */ |
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bn2ra(); |
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} else { |
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if (i != argc-2) |
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goto userr; |
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if (!strcmp(argv[i], "-")) |
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rafp = stdin; |
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else if ((rafp = fopen(argv[i], "r")) == NULL) { |
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sprintf(errmsg, "cannot open input \"%s\"", |
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argv[i]); |
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quiterr(errmsg); |
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} |
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/* get header */ |
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getheader(rafp, NULL); |
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if (fgetresolu(&xmax, &ymax, rafp) != (YMAJOR|YDECR)) |
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quiterr("bad RADIANCE format"); |
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if (openbarney(argv[i+1], "w") < 0) { |
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sprintf(errmsg, "cannot open output \"%s\"", argv[i+1]); |
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quiterr(errmsg); |
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} |
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/* convert file */ |
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ra2bn(); |
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} |
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quiterr(NULL); |
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userr: |
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fprintf(stderr, "Usage: %s {input|-} output\n", progname); |
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fprintf(stderr, " or: %s -r [-g gamma] input [output|-]\n", |
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progname); |
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exit(1); |
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} |
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|
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|
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quiterr(err) /* print message and exit */ |
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char *err; |
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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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openbarney(fname, mode) /* open barneyscan files */ |
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char *fname; |
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char *mode; |
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{ |
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static char suffix[3][4] = {"red", "grn", "blu"}; |
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int i; |
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char file[128]; |
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|
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for (i = 0; i < 3; i++) { |
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sprintf(file, "%s.%s", fname, suffix[i]); |
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if ((bnfp[i] = fopen(file, mode)) == NULL) |
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return(-1); |
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} |
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if (mode[0] == 'r') { /* get header */ |
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xmax = getint(bnfp[0]); |
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ymax = getint(bnfp[0]); |
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for (i = 1; i < 3; i++) |
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if (getint(bnfp[i]) != xmax || getint(bnfp[i]) != ymax) |
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return(-1); |
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} else { /* put header */ |
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for (i = 0; i < 3; i++) { |
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putint(xmax, bnfp[i]); |
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putint(ymax, bnfp[i]); |
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} |
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} |
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return(0); |
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} |
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|
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|
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int |
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getint(fp) /* get short int from barneyscan file */ |
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register FILE *fp; |
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{ |
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register short val; |
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|
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val = getc(fp); |
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val |= getc(fp) << 8; |
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|
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return(val); |
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} |
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|
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|
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putint(val, fp) /* put short int to barneyscan file */ |
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register int val; |
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register FILE *fp; |
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{ |
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putc(val&0xff, fp); |
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putc((val >> 8)&0xff, fp); |
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} |
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|
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|
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ra2bn() /* convert radiance to barneyscan */ |
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{ |
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unsigned char gmap[1024]; |
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register int i,k,c; |
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register COLOR *inline; |
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int j; |
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|
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if ((inline = (COLOR *)malloc(xmax*sizeof(COLOR))) == NULL) |
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quiterr("out of memory"); |
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for (i = 0; i < 1024; i++) |
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gmap[i] = 256.*pow((i+.5)/1024., 1./gamma); |
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for (j = 0; j < ymax; j++) { |
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if (freadscan(inline, xmax, rafp) < 0) |
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quiterr("error reading RADIANCE file"); |
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for (i = 0; i < xmax; i++) |
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for (k = 0; k < 3; k++) { |
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c = 1024.*colval(inline[i],k); |
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if (c >= 1024) |
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c = 1023; |
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putc(gmap[c], bnfp[k]); |
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} |
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} |
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free((char *)inline); |
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} |
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|
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|
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bn2ra() /* convert barneyscan to radiance */ |
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{ |
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float gmap[256]; |
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register int i,k,c; |
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register COLOR *outline; |
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int j; |
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|
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if ((outline = (COLOR *)malloc(xmax*sizeof(COLOR))) == NULL) |
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quiterr("out of memory"); |
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for (i = 0; i < 256; i++) |
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gmap[i] = pow((i+.5)/256., gamma); |
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for (j = 0; j < ymax; j++) { |
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for (i = 0; i < xmax; i++) |
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for (k = 0; k < 3; k++) |
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if ((c = getc(bnfp[k])) == EOF) |
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quiterr("error reading barney file"); |
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else |
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colval(outline[i],k) = gmap[c]; |
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if (fwritescan(outline, xmax, rafp) < 0) |
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quiterr("error writing RADIANCE file"); |
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} |
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free((char *)outline); |
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} |
