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#ifndef lint
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static const char RCSid[] = "$Id: ra_skel.c,v 2.14 2025/06/06 19:11:21 greg Exp $";
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#endif
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/*
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* Skeletal 24-bit image conversion program. Replace "skel"
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* in this file with a more appropriate image type identifier.
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*
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* The Rmakefile entry should look something like this:
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* ra_skel: ra_skel.o
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* cc $(CFLAGS) -o ra_skel ra_skel.o -lrtrad -lm
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* ra_skel.o: ../common/color.h ../common/resolu.h
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*
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* If you like to do things the hard way, you can link directly
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* to the object files "color.o colrops.o resolu.o header.o" in
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* the common subdirectory instead of using the -lrtrad library.
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*/
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#include <stdio.h>
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#include <math.h>
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#include <time.h>
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#include "platform.h"
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#include "color.h"
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#include "resolu.h"
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double gamcor = 2.2; /* gamma correction */
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int bradj = 0; /* brightness adjustment */
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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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int reverse = 0;
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int i;
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fixargv0(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': /* gamma correction */
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gamcor = atof(argv[++i]);
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break;
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case 'e': /* exposure adjustment */
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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 'r': /* reverse conversion */
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reverse = 1;
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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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SET_FILE_BINARY(stdin);
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SET_FILE_BINARY(stdout);
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setcolrgam(gamcor); /* set up gamma correction */
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if (reverse) {
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/* get their image resolution */
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read_skel_head(&xmax, &ymax);
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/* put our header */
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newheader("RADIANCE", stdout);
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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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skel2ra();
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} else {
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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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/* write their header */
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write_skel_head(xmax, ymax);
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/* convert file */
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ra2skel();
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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][-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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skel2ra() /* convert 24-bit scanlines to Radiance picture */
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{
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COLR *scanout;
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register int x;
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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 skel2ra");
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/* convert image */
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for (y = ymax-1; y >= 0; y--) {
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for (x = 0; x < xmax; x++) {
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scanout[x][RED] = getc(stdin);
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scanout[x][GRN] = getc(stdin);
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scanout[x][BLU] = getc(stdin);
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}
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if (feof(stdin) | ferror(stdin))
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quiterr("error reading skel image");
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/* undo gamma */
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gambs_colrs(scanout, xmax);
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if (bradj) /* adjust exposure */
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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((void *)scanout);
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}
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ra2skel() /* convert Radiance scanlines to 24-bit */
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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 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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if (bradj) /* adjust exposure */
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shiftcolrs(scanin, xmax, bradj);
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colrs_gambs(scanin, xmax); /* gamma correction */
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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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if (ferror(stdout))
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quiterr("error writing skel file");
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}
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/* free scanline */
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free((void *)scanin);
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}
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