src/px/ra_skel.c

#ifndef lint
static const char       RCSid[] = "$Id: ra_skel.c,v 2.14 2025/06/06 19:11:21 greg Exp $";
#endif
/*
 *  Skeletal 24-bit image conversion program.  Replace "skel"
 *  in this file with a more appropriate image type identifier.
 *
 *  The Rmakefile entry should look something like this:
 *      ra_skel:        ra_skel.o
 *              cc $(CFLAGS) -o ra_skel ra_skel.o -lrtrad -lm
 *      ra_skel.o:      ../common/color.h ../common/resolu.h
 *
 *  If you like to do things the hard way, you can link directly
 *  to the object files "color.o colrops.o resolu.o header.o" in
 *  the common subdirectory instead of using the -lrtrad library.
 */

#include  <stdio.h>
#include  <math.h>
#include  <time.h>
#include  "platform.h"
#include  "color.h"
#include  "resolu.h"

double  gamcor = 2.2;                   /* gamma correction */

int  bradj = 0;                         /* brightness adjustment */

int  xmax, ymax;


main(argc, argv)
int  argc;
char  *argv[];
{
        int  reverse = 0;
        int  i;
        
        fixargv0(argv[0]);

        for (i = 1; i < argc; i++)
                if (argv[i][0] == '-')
                        switch (argv[i][1]) {
                        case 'g':               /* gamma correction */
                                gamcor = atof(argv[++i]);
                                break;
                        case 'e':               /* exposure adjustment */
                                if (argv[i+1][0] != '+' && argv[i+1][0] != '-')
                                        goto userr;
                                bradj = atoi(argv[++i]);
                                break;
                        case 'r':               /* reverse conversion */
                                reverse = 1;
                                break;
                        default:
                                goto userr;
                        }
                else
                        break;

        if (i < argc-2)
                goto userr;
        if (i <= argc-1 && freopen(argv[i], "r", stdin) == NULL) {
                fprintf(stderr, "%s: can't open input \"%s\"\n",
                                progname, argv[i]);
                exit(1);
        }
        if (i == argc-2 && freopen(argv[i+1], "w", stdout) == NULL) {
                fprintf(stderr, "%s: can't open output \"%s\"\n",
                                progname, argv[i+1]);
                exit(1);
        }
        SET_FILE_BINARY(stdin);
        SET_FILE_BINARY(stdout);
        setcolrgam(gamcor);             /* set up gamma correction */
        if (reverse) {
                                        /* get their image resolution */
                read_skel_head(&xmax, &ymax);
                                        /* put our header */
                newheader("RADIANCE", stdout);
                printargs(i, argv, stdout);
                fputformat(COLRFMT, stdout);
                putchar('\n');
                fprtresolu(xmax, ymax, stdout);
                                        /* convert file */
                skel2ra();
        } else {
                                        /* get our header */
                if (checkheader(stdin, COLRFMT, NULL) < 0 ||
                                fgetresolu(&xmax, &ymax, stdin) < 0)
                        quiterr("bad picture format");
                                        /* write their header */
                write_skel_head(xmax, ymax);
                                        /* convert file */
                ra2skel();
        }
        exit(0);
userr:
        fprintf(stderr,
                "Usage: %s [-r][-g gamma][-e +/-stops] [input [output]]\n",
                        progname);
        exit(1);
}


quiterr(err)            /* print message and exit */
char  *err;
{
        if (err != NULL) {
                fprintf(stderr, "%s: %s\n", progname, err);
                exit(1);
        }
        exit(0);
}


skel2ra()               /* convert 24-bit scanlines to Radiance picture */
{
        COLR    *scanout;
        register int    x;
        int     y;
                                                /* allocate scanline */
        scanout = (COLR *)malloc(xmax*sizeof(COLR));
        if (scanout == NULL)
                quiterr("out of memory in skel2ra");
                                                /* convert image */
        for (y = ymax-1; y >= 0; y--) {
                for (x = 0; x < xmax; x++) {
                        scanout[x][RED] = getc(stdin);
                        scanout[x][GRN] = getc(stdin);
                        scanout[x][BLU] = getc(stdin);
                }
                if (feof(stdin) | ferror(stdin))
                        quiterr("error reading skel image");
                                                /* undo gamma */
                gambs_colrs(scanout, xmax);
                if (bradj)                      /* adjust exposure */
                        shiftcolrs(scanout, xmax, bradj);
                if (fwritecolrs(scanout, xmax, stdout) < 0)
                        quiterr("error writing Radiance picture");
        }
                                                /* free scanline */
        free((void *)scanout);
}


ra2skel()               /* convert Radiance scanlines to 24-bit */
{
        COLR    *scanin;
        register int    x;
        int     y;
                                                /* allocate scanline */
        scanin = (COLR *)malloc(xmax*sizeof(COLR));
        if (scanin == NULL)
                quiterr("out of memory in ra2skel");
                                                /* convert image */
        for (y = ymax-1; y >= 0; y--) {
                if (freadcolrs(scanin, xmax, stdin) < 0)
                        quiterr("error reading Radiance picture");
                if (bradj)                      /* adjust exposure */
                        shiftcolrs(scanin, xmax, bradj);
                colrs_gambs(scanin, xmax);      /* gamma correction */
                for (x = 0; x < xmax; x++) {
                        putc(scanin[x][RED], stdout);
                        putc(scanin[x][GRN], stdout);
                        putc(scanin[x][BLU], stdout);
                }
                if (ferror(stdout))
                        quiterr("error writing skel file");
        }
                                                /* free scanline */
        free((void *)scanin);
}
Revision:	2.15
Committed:	Sat Jun 7 05:09:46 2025 UTC (2 weeks, 4 days ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	HEAD
Changes since 2.14:	+1 -2 lines
Log Message:	refactor: Put some declarations into "paths.h" and included in "platform.h"
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.15	static const char RCSid[] = "$Id: ra_skel.c,v 2.14 2025/06/06 19:11:21 greg Exp $";
3	greg	2.1	#endif
4	greg	2.4	/*
5			* Skeletal 24-bit image conversion program. Replace "skel"
6	greg	2.1	* in this file with a more appropriate image type identifier.
7			*
8	greg	2.10	* The Rmakefile entry should look something like this:
9	greg	2.1	* ra_skel: ra_skel.o
10	schorsch	2.13	* cc $(CFLAGS) -o ra_skel ra_skel.o -lrtrad -lm
11	greg	2.1	* ra_skel.o: ../common/color.h ../common/resolu.h
12			*
13			* If you like to do things the hard way, you can link directly
14			* to the object files "color.o colrops.o resolu.o header.o" in
15	schorsch	2.13	* the common subdirectory instead of using the -lrtrad library.
16	greg	2.1	*/
17
18			#include <stdio.h>
19	greg	2.5	#include <math.h>
20	greg	2.11	#include <time.h>
21	schorsch	2.12	#include "platform.h"
22	greg	2.1	#include "color.h"
23			#include "resolu.h"
24
25	greg	2.6	double gamcor = 2.2; /* gamma correction */
26	greg	2.1
27			int bradj = 0; /* brightness adjustment */
28
29			int xmax, ymax;
30
31
32			main(argc, argv)
33			int argc;
34			char *argv[];
35			{
36			int reverse = 0;
37			int i;
38
39	greg	2.14	fixargv0(argv[0]);
40	greg	2.1
41			for (i = 1; i < argc; i++)
42			if (argv[i][0] == '-')
43			switch (argv[i][1]) {
44			case 'g': /* gamma correction */
45	greg	2.6	gamcor = atof(argv[++i]);
46	greg	2.1	break;
47			case 'e': /* exposure adjustment */
48			if (argv[i+1][0] != '+' && argv[i+1][0] != '-')
49			goto userr;
50			bradj = atoi(argv[++i]);
51			break;
52			case 'r': /* reverse conversion */
53			reverse = 1;
54			break;
55			default:
56			goto userr;
57			}
58			else
59			break;
60
61			if (i < argc-2)
62			goto userr;
63			if (i <= argc-1 && freopen(argv[i], "r", stdin) == NULL) {
64			fprintf(stderr, "%s: can't open input \"%s\"\n",
65			progname, argv[i]);
66			exit(1);
67			}
68			if (i == argc-2 && freopen(argv[i+1], "w", stdout) == NULL) {
69	greg	2.8	fprintf(stderr, "%s: can't open output \"%s\"\n",
70	greg	2.1	progname, argv[i+1]);
71			exit(1);
72			}
73	schorsch	2.12	SET_FILE_BINARY(stdin);
74			SET_FILE_BINARY(stdout);
75	greg	2.6	setcolrgam(gamcor); /* set up gamma correction */
76	greg	2.1	if (reverse) {
77			/* get their image resolution */
78			read_skel_head(&xmax, &ymax);
79			/* put our header */
80	greg	2.9	newheader("RADIANCE", stdout);
81	greg	2.1	printargs(i, argv, stdout);
82			fputformat(COLRFMT, stdout);
83			putchar('\n');
84			fprtresolu(xmax, ymax, stdout);
85			/* convert file */
86			skel2ra();
87			} else {
88			/* get our header */
89			if (checkheader(stdin, COLRFMT, NULL) < 0 \|\|
90			fgetresolu(&xmax, &ymax, stdin) < 0)
91			quiterr("bad picture format");
92			/* write their header */
93			write_skel_head(xmax, ymax);
94			/* convert file */
95			ra2skel();
96			}
97			exit(0);
98			userr:
99			fprintf(stderr,
100			"Usage: %s [-r][-g gamma][-e +/-stops] [input [output]]\n",
101			progname);
102			exit(1);
103			}
104
105
106			quiterr(err) /* print message and exit */
107			char *err;
108			{
109			if (err != NULL) {
110			fprintf(stderr, "%s: %s\n", progname, err);
111			exit(1);
112			}
113			exit(0);
114			}
115
116
117			skel2ra() /* convert 24-bit scanlines to Radiance picture */
118			{
119			COLR *scanout;
120			register int x;
121			int y;
122			/* allocate scanline */
123			scanout = (COLR )malloc(xmaxsizeof(COLR));
124			if (scanout == NULL)
125			quiterr("out of memory in skel2ra");
126			/* convert image */
127			for (y = ymax-1; y >= 0; y--) {
128	greg	2.7	for (x = 0; x < xmax; x++) {
129			scanout[x][RED] = getc(stdin);
130			scanout[x][GRN] = getc(stdin);
131			scanout[x][BLU] = getc(stdin);
132			}
133			if (feof(stdin) \| ferror(stdin))
134	greg	2.1	quiterr("error reading skel image");
135			/* undo gamma */
136			gambs_colrs(scanout, xmax);
137			if (bradj) /* adjust exposure */
138			shiftcolrs(scanout, xmax, bradj);
139			if (fwritecolrs(scanout, xmax, stdout) < 0)
140			quiterr("error writing Radiance picture");
141			}
142			/* free scanline */
143	greg	2.11	free((void *)scanout);
144	greg	2.1	}
145
146
147			ra2skel() /* convert Radiance scanlines to 24-bit */
148			{
149			COLR *scanin;
150			register int x;
151			int y;
152			/* allocate scanline */
153			scanin = (COLR )malloc(xmaxsizeof(COLR));
154			if (scanin == NULL)
155			quiterr("out of memory in ra2skel");
156			/* convert image */
157			for (y = ymax-1; y >= 0; y--) {
158			if (freadcolrs(scanin, xmax, stdin) < 0)
159			quiterr("error reading Radiance picture");
160			if (bradj) /* adjust exposure */
161			shiftcolrs(scanin, xmax, bradj);
162			colrs_gambs(scanin, xmax); /* gamma correction */
163			for (x = 0; x < xmax; x++) {
164			putc(scanin[x][RED], stdout);
165			putc(scanin[x][GRN], stdout);
166			putc(scanin[x][BLU], stdout);
167			}
168			if (ferror(stdout))
169			quiterr("error writing skel file");
170			}
171			/* free scanline */
172	greg	2.11	free((void *)scanin);
173	greg	2.1	}