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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_pr.c - program to convert between RADIANCE and pixrect picture format. |
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* |
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* 11/10/87 |
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* 3/1/88 Added Paul Heckbert's color map allocation |
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*/ |
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|
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#include <stdio.h> |
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|
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#include <rasterfile.h> |
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|
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#include "color.h" |
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|
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#include "pic.h" |
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|
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/* descriptor for a picture file or frame buffer */ |
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typedef struct { |
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char *name; /* file name */ |
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FILE *fp; /* file pointer */ |
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int nexty; /* file positioning */ |
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int bytes_line; /* 0 == variable length lines */ |
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union { |
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long b; /* initial scanline */ |
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long *y; /* individual scanline */ |
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} pos; /* position(s) */ |
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} pic; |
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|
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extern pic *openinput(), *openoutput(); |
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|
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extern char *ecalloc(), *emalloc(); |
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|
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extern long ftell(); |
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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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pic *inpic, *outpic; |
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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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COLR *inline; |
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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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colormap rasmap; |
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struct rasterfile head; |
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int dither = 1; |
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int reverse = 0; |
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int ncolors = 256; |
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int greyscale = 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 'd': |
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dither = !dither; |
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break; |
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case 'g': |
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gamma = atof(argv[++i]); |
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break; |
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case 'b': |
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greyscale = !greyscale; |
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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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case 'c': |
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ncolors = atoi(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 (reverse) { |
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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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sprintf(errmsg, "can't open input \"%s\"", argv[i]); |
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quiterr(errmsg); |
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} |
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if (i == argc-2 && freopen(argv[i+1], "w", stdout) == NULL) { |
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sprintf(errmsg, "can't open output \"%s\"", argv[i+1]); |
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quiterr(errmsg); |
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} |
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/* get header */ |
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if (fread(&head, sizeof(head), 1, stdin) != 1) |
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quiterr("missing header"); |
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if (head.ras_magic != RAS_MAGIC) |
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quiterr("bad raster format"); |
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xmax = head.ras_width; |
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ymax = head.ras_height; |
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if (head.ras_type != RT_STANDARD || |
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head.ras_maptype != RMT_EQUAL_RGB || |
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head.ras_depth != 8) |
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quiterr("incompatible format"); |
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/* put header */ |
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printargs(argc, argv, stdout); |
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putchar('\n'); |
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printf("-Y %d +X %d\n", ymax, xmax); |
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/* convert file */ |
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pr2ra(&head); |
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} else { |
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if (i > argc-1 || i < argc-2) |
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goto userr; |
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if ((inpic = openinput(argv[i], &head)) == NULL) { |
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sprintf(errmsg, "can't open input \"%s\"", argv[i]); |
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quiterr(errmsg); |
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} |
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if ((outpic = openoutput(i==argc-2 ? argv[i+1] : (char *)NULL, |
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&head)) == NULL) { |
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sprintf(errmsg, "can't 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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if (greyscale) |
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biq(dither,ncolors,1,rasmap); |
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else |
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ciq(dither,ncolors,1,rasmap); |
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} |
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quiterr(NULL); |
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userr: |
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fprintf(stderr, |
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"Usage: %s [-d][-c ncolors][-b][-g gamma] input [output]\n", |
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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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eputs(s) |
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char *s; |
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{ |
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fputs(s, stderr); |
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} |
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|
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|
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quit(code) |
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int code; |
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{ |
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exit(code); |
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} |
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|
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|
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pic * |
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openinput(fname, h) /* open RADIANCE input file */ |
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char *fname; |
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register struct rasterfile *h; |
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{ |
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register pic *p; |
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|
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p = (pic *)emalloc(sizeof(pic)); |
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p->name = fname; |
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if (fname == NULL) |
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p->fp = stdin; |
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else if ((p->fp = fopen(fname, "r")) == NULL) |
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return(NULL); |
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/* discard header */ |
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getheader(p->fp, NULL); |
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if (fscanf(p->fp, "-Y %d +X %d\n", &ymax, &xmax) != 2) |
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quiterr("bad picture size"); |
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p->nexty = 0; |
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p->bytes_line = 0; /* variable length lines */ |
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p->pos.y = (long *)ecalloc(ymax, sizeof(long)); |
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p->pos.y[0] = ftell(p->fp); |
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/* assign header */ |
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h->ras_magic = RAS_MAGIC; |
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h->ras_width = xmax + (xmax&1); /* round to 16 bits */ |
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h->ras_height = ymax; |
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h->ras_depth = 8; |
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h->ras_type = RT_STANDARD; |
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h->ras_length = h->ras_width*h->ras_height; |
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h->ras_maptype = RMT_EQUAL_RGB; |
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h->ras_maplength = 256*3; |
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/* allocate scanline */ |
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inline = (COLR *)emalloc(xmax*sizeof(COLR)); |
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|
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return(p); |
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} |
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|
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|
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pic * |
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openoutput(fname, h) /* open output rasterfile */ |
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char *fname; |
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register struct rasterfile *h; |
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{ |
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register pic *p; |
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|
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p = (pic *)emalloc(sizeof(pic)); |
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p->name = fname; |
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if (fname == NULL) |
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p->fp = stdout; |
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else if ((p->fp = fopen(fname, "w")) == NULL) |
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return(NULL); |
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/* write header */ |
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fwrite(h, sizeof(*h), 1, p->fp); |
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p->nexty = -1; /* needs color map */ |
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p->bytes_line = h->ras_width; |
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p->pos.b = 0; |
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|
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return(p); |
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} |
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|
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|
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pr2ra(h) /* pixrect file to RADIANCE file */ |
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struct rasterfile *h; |
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{ |
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BYTE cmap[3][256]; |
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COLR ctab[256]; |
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COLR *scanline; |
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register int i, j, c; |
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|
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scanline = (COLR *)emalloc(xmax*sizeof(COLR)); |
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/* get color table */ |
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for (i = 0; i < 3; i ++) |
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if (fread(cmap[i], h->ras_maplength/3, 1, stdin) != 1) |
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quiterr("error reading color table"); |
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/* convert table */ |
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for (i = 0; i < h->ras_maplength/3; i++) |
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setcolr(ctab[i], |
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pow((cmap[0][i]+.5)/256.,gamma), |
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pow((cmap[1][i]+.5)/256.,gamma), |
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pow((cmap[2][i]+.5)/256.,gamma)); |
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/* convert file */ |
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for (i = 0; i < ymax; i++) { |
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for (j = 0; j < xmax; j++) { |
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if ((c = getc(stdin)) == EOF) |
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quiterr("error reading rasterfile"); |
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copycolr(scanline[j], ctab[c]); |
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} |
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if (xmax & 1) /* extra byte */ |
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getc(stdin); |
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if (fwritecolrs(scanline, xmax, stdout) < 0) |
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quiterr("error writing RADIANCE file"); |
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} |
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free((char *)scanline); |
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} |
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|
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|
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picreadline3(y, l3) /* read in 3-byte scanline */ |
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int y; |
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register rgbpixel *l3; |
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{ |
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register BYTE *l4; |
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register int shift, c; |
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int i; |
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|
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if (inpic->nexty != y) { /* find scanline */ |
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if (inpic->bytes_line == 0) { |
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if (inpic->pos.y[y] == 0) { |
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while (inpic->nexty < y) { |
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if (freadcolrs(inline, xmax, inpic->fp) < 0) |
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quiterr("read error in picreadline3"); |
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inpic->pos.y[++inpic->nexty] = ftell(inpic->fp); |
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} |
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} else if (fseek(inpic->fp, inpic->pos.y[y], 0) == EOF) |
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quiterr("seek error in picreadline3"); |
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} else if (fseek(inpic->fp, y*inpic->bytes_line+inpic->pos.b, 0) == EOF) |
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quiterr("seek error in picreadline3"); |
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} else if (inpic->bytes_line == 0 && inpic->pos.y[inpic->nexty] == 0) |
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inpic->pos.y[inpic->nexty] = ftell(inpic->fp); |
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if (freadcolrs(inline, xmax, inpic->fp) < 0) /* read scanline */ |
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quiterr("read error in picreadline3"); |
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inpic->nexty = y+1; |
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/* convert scanline */ |
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for (l4=inline[0], i=xmax; i--; l4+=4, l3++) { |
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shift = l4[EXP] - COLXS; |
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if (shift >= 8) { |
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l3->r = l3->g = l3->b = 255; |
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} else if (shift <= -8) { |
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l3->r = l3->g = l3->b = 0; |
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} else if (shift > 0) { |
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c = l4[RED] << shift; |
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l3->r = c > 255 ? 255 : c; |
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c = l4[GRN] << shift; |
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l3->g = c > 255 ? 255 : c; |
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c = l4[BLU] << shift; |
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l3->b = c > 255 ? 255 : c; |
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} else if (shift < 0) { |
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l3->r = l4[RED] >> -shift; |
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l3->g = l4[GRN] >> -shift; |
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l3->b = l4[BLU] >> -shift; |
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} else { |
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l3->r = l4[RED]; |
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l3->g = l4[GRN]; |
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l3->b = l4[BLU]; |
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} |
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} |
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} |
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|
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|
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picwriteline(y, l) /* write out scanline */ |
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int y; |
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register pixel *l; |
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{ |
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if (outpic->nexty != y) { /* seek to scanline */ |
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if (outpic->bytes_line == 0) { |
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if (outpic->pos.y[y] == 0) |
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quiterr("cannot seek in picwriteline"); |
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else if (fseek(outpic->fp, outpic->pos.y[y], 0) == EOF) |
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quiterr("seek error in picwriteline"); |
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} else if (fseek(outpic->fp, y*outpic->bytes_line+outpic->pos.b, 0) == EOF) |
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quiterr("seek error in picwriteline"); |
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} |
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/* write scanline */ |
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if (fwrite(l, sizeof(pixel), xmax, outpic->fp) != xmax) |
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quiterr("write error in picwriteline"); |
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if (xmax&1) /* on 16-bit boundary */ |
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putc(l[xmax-1], outpic->fp); |
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outpic->nexty = y+1; |
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if (outpic->bytes_line == 0 && outpic->pos.y[outpic->nexty] == 0) |
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outpic->pos.y[outpic->nexty] = ftell(outpic->fp); |
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} |
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|
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|
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picwritecm(cm) /* write out color map */ |
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colormap cm; |
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{ |
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register int i, j; |
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|
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if (outpic->nexty != -1 && |
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fseek(outpic->fp, (long)sizeof(struct rasterfile), 0) == EOF) |
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quiterr("seek error in picwritecm"); |
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for (i = 0; i < 3; i++) |
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for (j = 0; j < 256; j++) |
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putc(cm[i][j], outpic->fp); |
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outpic->nexty = 0; |
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if (outpic->bytes_line == 0) |
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outpic->pos.y[0] = ftell(outpic->fp); |
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else |
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outpic->pos.b = ftell(outpic->fp); |
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} |
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|
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|
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picreadcm(map) /* do gamma correction if requested */ |
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colormap map; |
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{ |
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register int i, val; |
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|
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for (i = 0; i < 256; i++) { |
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val = pow(i/256.0, 1.0/gamma) * 256.0; |
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map[0][i] = map[1][i] = map[2][i] = val; |
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} |
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} |
