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/* Copyright (c) 1992 Regents of the University of California */
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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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* program to convert between RADIANCE and Poskanzer Pixmaps
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*/
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#include <stdio.h>
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#ifdef MSDOS
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#include <fcntl.h>
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#endif
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#include <math.h>
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#include <ctype.h>
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#include "color.h"
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#include "resolu.h"
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extern char *malloc();
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int agryscan(), bgryscan(), aclrscan(), bclrscan();
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int bradj = 0; /* brightness adjustment */
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int maxval = 255; /* maximum primary value */
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char *progname;
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int xmax, ymax;
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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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char inpbuf[2];
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double gamcor = 2.2;
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int binflag = 1;
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int reverse = 0;
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int ptype;
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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 'g':
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gamcor = atof(argv[++i]);
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break;
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case 'e':
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if (argv[i+1][0] != '+' && argv[i+1][0] != '-')
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goto userr;
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bradj = atoi(argv[++i]);
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break;
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case 'a':
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binflag = 0;
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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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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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setcolrgam(gamcor);
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if (reverse) {
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/* get header */
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if (read(fileno(stdin), inpbuf, 2) != 2 || inpbuf[0] != 'P')
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quiterr("input not a Poskanzer Pixmap");
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ptype = inpbuf[1];
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#ifdef MSDOS
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if (ptype > 4)
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setmode(fileno(stdin), O_BINARY);
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setmode(fileno(stdout), O_BINARY);
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#endif
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xmax = scanint(stdin);
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ymax = scanint(stdin);
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maxval = scanint(stdin);
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/* put header */
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printargs(i, argv, stdout);
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fputformat(COLRFMT, stdout);
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putchar('\n');
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fprtresolu(xmax, ymax, stdout);
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/* convert file */
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switch (ptype) {
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case '2':
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ppm2ra(agryscan);
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break;
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case '5':
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ppm2ra(bgryscan);
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break;
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case '3':
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ppm2ra(aclrscan);
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break;
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case '6':
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ppm2ra(bclrscan);
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break;
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default:
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quiterr("unsupported Pixmap type");
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}
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} else {
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#ifdef MSDOS
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setmode(fileno(stdin), O_BINARY);
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if (binflag)
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setmode(fileno(stdout), O_BINARY);
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#endif
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/* get header info. */
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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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/* write PPM header */
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printf("P%c\n%d %d\n%d\n", binflag ? '6' : '3',
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xmax, ymax, maxval);
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/* convert file */
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ra2ppm(binflag);
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}
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exit(0);
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userr:
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fprintf(stderr,
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"Usage: %s [-r][-a][-g gamma][-e +/-stops] [input [output]]\n",
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progname);
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exit(1);
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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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ppm2ra(getscan) /* convert color Pixmap to Radiance picture */
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int (*getscan)();
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{
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COLR *scanout;
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int y;
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/* allocate scanline */
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scanout = (COLR *)malloc(xmax*sizeof(COLR));
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if (scanout == NULL)
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quiterr("out of memory in ppm2ra");
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/* convert image */
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for (y = ymax-1; y >= 0; y--) {
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if ((*getscan)(scanout, xmax, stdin) < 0)
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quiterr("error reading Pixmap");
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gambs_colrs(scanout, xmax);
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if (bradj)
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shiftcolrs(scanout, xmax, bradj);
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if (fwritecolrs(scanout, xmax, stdout) < 0)
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quiterr("error writing Radiance picture");
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}
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/* free scanline */
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free((char *)scanout);
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}
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ra2ppm(binary) /* convert Radiance picture to Pixmap */
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int binary;
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{
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COLR *scanin;
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register int x;
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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 ra2pr");
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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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if (bradj)
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shiftcolrs(scanin, xmax, bradj);
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colrs_gambs(scanin, xmax);
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if (binary)
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for (x = 0; x < xmax; x++) {
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putc(scanin[x][RED], stdout);
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putc(scanin[x][GRN], stdout);
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putc(scanin[x][BLU], stdout);
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}
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else
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for (x = 0; x < xmax; x++)
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printf("%d %d %d\n", scanin[x][RED],
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scanin[x][GRN],
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scanin[x][BLU]);
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if (ferror(stdout))
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quiterr("error writing Pixmap");
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}
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/* free scanline */
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free((char *)scanin);
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}
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agryscan(scan, len, fp) /* get an ASCII greyscale scanline */
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register COLR *scan;
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register int len;
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FILE *fp;
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{
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while (len-- > 0) {
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scan[0][RED] =
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scan[0][GRN] =
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scan[0][BLU] = normval(scanint(fp));
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scan++;
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}
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return(0);
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}
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bgryscan(scan, len, fp) /* get a binary greyscale scanline */
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register COLR *scan;
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int len;
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register FILE *fp;
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{
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register int c;
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while (len-- > 0) {
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if ((c = getc(fp)) == EOF)
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return(-1);
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if (maxval != 255)
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c = normval(c);
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scan[0][RED] =
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scan[0][GRN] =
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scan[0][BLU] = c;
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scan++;
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}
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return(0);
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}
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aclrscan(scan, len, fp) /* get an ASCII color scanline */
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register COLR *scan;
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register int len;
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FILE *fp;
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{
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while (len-- > 0) {
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scan[0][RED] = normval(scanint(fp));
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scan[0][GRN] = normval(scanint(fp));
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scan[0][BLU] = normval(scanint(fp));
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scan++;
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}
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return(0);
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}
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bclrscan(scan, len, fp) /* get a binary color scanline */
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register COLR *scan;
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int len;
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register FILE *fp;
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{
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int r, g, b;
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while (len-- > 0) {
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r = getc(fp);
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g = getc(fp);
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if ((b = getc(fp)) == EOF)
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return(-1);
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if (maxval == 255) {
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scan[0][RED] = r;
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scan[0][GRN] = g;
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scan[0][BLU] = b;
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} else {
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scan[0][RED] = normval(r);
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scan[0][GRN] = normval(g);
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scan[0][BLU] = normval(b);
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}
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scan++;
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}
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return(0);
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}
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int
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scanint(fp) /* scan the next positive integer value */
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register FILE *fp;
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{
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register int i, c;
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tryagain:
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while (isspace(c = getc(fp)))
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;
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if (c == EOF)
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quiterr("unexpected end of file");
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if (c == '#') { /* comment */
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while ((c = getc(fp)) != EOF && c != '\n')
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;
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goto tryagain;
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}
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/* should be integer */
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i = 0;
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do {
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if (!isdigit(c))
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quiterr("error reading integer");
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i = 10*i + c - '0';
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c = getc(fp);
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} while (c != EOF && !isspace(c));
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return(i);
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}
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int
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normval(v) /* normalize a value to [0,255] */
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register int v;
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{
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if (v >= maxval)
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return(255);
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if (maxval == 255)
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return(v);
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return(v*255L/maxval);
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}
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