src/px/pflip.c

#ifndef lint
static const char       RCSid[] = "$Id: pflip.c,v 2.13 2025/06/06 19:11:21 greg Exp $";
#endif
/*
 * flip picture file horizontally and/or vertically
 */

#include "rtio.h"
#include "platform.h"
#include "color.h"
#include "resolu.h"

int     order;                          /* input orientation */
int     xres, yres;                     /* resolution (scanlen, nscans) */

long    *scanpos;                       /* scanline positions */

int     fhoriz=0, fvert=0;              /* flip flags */

int     correctorder = 0;               /* correcting orientation? */

FILE    *fin;                           /* input file */


static void memerr(void);
static void scanfile(void);
static void flip(void);


static int
neworder(void)                  /* figure out new order from old */
{
        register int  no;

        if (correctorder)
                return(order);          /* just leave it */
        if ((no = order) & YMAJOR) {
                if (fhoriz) no ^= XDECR;
                if (fvert) no ^= YDECR;
        } else {
                if (fhoriz) no ^= YDECR;
                if (fvert) no ^= XDECR;
        }
        return(no);
}

int
main(
        int     argc,
        char    *argv[]
)
{
        static char     picfmt[MAXFMTLEN] = PICFMT;
        int     i, rval;
        
        SET_DEFAULT_BINARY();
        SET_FILE_BINARY(stdout);
        fixargv0(argv[0]);

        for (i = 1; i < argc; i++)
                if (!strcmp(argv[i], "-h"))
                        fhoriz++;
                else if (!strcmp(argv[i], "-v"))
                        fvert++;
                else if (!strcmp(argv[i], "-c"))
                        correctorder++;
                else
                        break;
        if (i < argc-2)
                goto userr;
        if (!fhoriz && !fvert)
                fprintf(stderr, "%s: warning - no operation\n", argv[0]);
        if (i >= argc || argv[i][0] == '-') {
                if (fvert)
                        goto userr;
                SET_FILE_BINARY(stdin);
                fin = stdin;
        } else if ((fin = fopen(argv[i], "r")) == NULL) {
                fprintf(stderr, "%s: cannot open\n", argv[i]);
                exit(1);
        }
        if (i < argc-1 && freopen(argv[i+1], "w", stdout) == NULL) {
                fprintf(stderr, "%s: cannot open\n", argv[i+1]);
                exit(1);
        }
                                        /* transfer header */
        if ((rval = checkheader(fin, picfmt, stdout)) < 0) {
                fprintf(stderr, "%s: input not a Radiance picture\n",
                                progname);
                exit(1);
        }
        if (rval)
                fputformat(picfmt, stdout);
                                        /* add new header info. */
        printargs(i, argv, stdout);
        putchar('\n');
                                        /* get picture size */
        if ((order = fgetresolu(&xres, &yres, fin)) < 0) {
                fprintf(stderr, "%s: bad picture size\n", progname);
                exit(1);
        }
                                        /* write new picture size */
        fputresolu(neworder(), xres, yres, stdout);
                                        /* goto end if vertical flip */
        if (fvert)
                scanfile();
        flip();                         /* flip the image */
        exit(0);
userr:
        fprintf(stderr, "Usage: %s [-h][-v][-c] infile [outfile]\n",
                        progname);
        exit(1);
}


static void
memerr(void)
{
        fprintf(stderr, "%s: out of memory\n", progname);
        exit(1);
}


static void
scanfile(void)                          /* scan to the end of file */
{
        extern long     ftell();
        COLR    *scanin;
        int     y;

        if ((scanpos = (long *)malloc(yres*sizeof(long))) == NULL)
                memerr();
        if ((scanin = (COLR *)malloc(xres*sizeof(COLR))) == NULL)
                memerr();
        for (y = yres-1; y > 0; y--) {
                scanpos[y] = ftell(fin);
                if (freadcolrs(scanin, xres, fin) < 0) {
                        fprintf(stderr, "%s: read error\n", progname);
                        exit(1);
                }
        }
        scanpos[0] = ftell(fin);
        free((void *)scanin);
}


static void
flip(void)                                      /* flip the picture */
{
        COLR    *scanin, *scanout;
        int     y;
        register int    x;

        if ((scanin = (COLR *)malloc(xres*sizeof(COLR))) == NULL)
                memerr();
        if (fhoriz) {
                if ((scanout = (COLR *)malloc(xres*sizeof(COLR))) == NULL)
                        memerr();
        } else
                scanout = scanin;
        for (y = yres-1; y >= 0; y--) {
                if (fvert && fseek(fin, scanpos[yres-1-y], 0) == EOF) {
                        fprintf(stderr, "%s: seek error\n", progname);
                        exit(1);
                }
                if (freadcolrs(scanin, xres, fin) < 0) {
                        fprintf(stderr, "%s: read error\n", progname);
                        exit(1);
                }
                if (fhoriz)
                        for (x = 0; x < xres; x++)
                                copycolr(scanout[x], scanin[xres-1-x]);
                if (fwritecolrs(scanout, xres, stdout) < 0) {
                        fprintf(stderr, "%s: write error\n", progname);
                        exit(1);
                }
        }
        free((void *)scanin);
        if (fhoriz)
                free((void *)scanout);
}
Revision:	2.14
Committed:	Sat Jun 7 05:09:46 2025 UTC (12 days, 7 hours ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	HEAD
Changes since 2.13:	+1 -2 lines
Log Message:	refactor: Put some declarations into "paths.h" and included in "platform.h"
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.14	static const char RCSid[] = "$Id: pflip.c,v 2.13 2025/06/06 19:11:21 greg Exp $";
3	greg	1.1	#endif
4			/*
5			* flip picture file horizontally and/or vertically
6			*/
7
8	greg	2.12	#include "rtio.h"
9	schorsch	2.6	#include "platform.h"
10	greg	1.1	#include "color.h"
11	greg	1.5	#include "resolu.h"
12	greg	1.1
13	greg	1.5	int order; /* input orientation */
14			int xres, yres; /* resolution (scanlen, nscans) */
15
16	greg	1.1	long scanpos; / scanline positions */
17
18	greg	1.5	int fhoriz=0, fvert=0; /* flip flags */
19	greg	1.1
20	greg	1.5	int correctorder = 0; /* correcting orientation? */
21
22	greg	1.1	FILE fin; / input file */
23
24	greg	2.2
25	schorsch	2.8	static void memerr(void);
26			static void scanfile(void);
27			static void flip(void);
28
29
30			static int
31			neworder(void) /* figure out new order from old */
32	greg	1.5	{
33			register int no;
34
35			if (correctorder)
36			return(order); /* just leave it */
37			if ((no = order) & YMAJOR) {
38			if (fhoriz) no ^= XDECR;
39			if (fvert) no ^= YDECR;
40			} else {
41			if (fhoriz) no ^= YDECR;
42			if (fvert) no ^= XDECR;
43			}
44			return(no);
45			}
46
47	schorsch	2.8	int
48			main(
49			int argc,
50			char *argv[]
51			)
52	greg	1.1	{
53	greg	2.11	static char picfmt[MAXFMTLEN] = PICFMT;
54	greg	2.4	int i, rval;
55	greg	2.13
56	schorsch	2.6	SET_DEFAULT_BINARY();
57			SET_FILE_BINARY(stdout);
58	greg	2.13	fixargv0(argv[0]);
59	greg	1.1
60			for (i = 1; i < argc; i++)
61			if (!strcmp(argv[i], "-h"))
62			fhoriz++;
63			else if (!strcmp(argv[i], "-v"))
64			fvert++;
65	greg	1.5	else if (!strcmp(argv[i], "-c"))
66			correctorder++;
67	greg	1.1	else
68			break;
69	greg	2.10	if (i < argc-2)
70			goto userr;
71			if (!fhoriz && !fvert)
72			fprintf(stderr, "%s: warning - no operation\n", argv[0]);
73	greg	1.1	if (i >= argc \|\| argv[i][0] == '-') {
74	greg	2.10	if (fvert)
75			goto userr;
76			SET_FILE_BINARY(stdin);
77			fin = stdin;
78			} else if ((fin = fopen(argv[i], "r")) == NULL) {
79	greg	2.9	fprintf(stderr, "%s: cannot open\n", argv[i]);
80	greg	1.1	exit(1);
81			}
82			if (i < argc-1 && freopen(argv[i+1], "w", stdout) == NULL) {
83			fprintf(stderr, "%s: cannot open\n", argv[i+1]);
84			exit(1);
85			}
86			/* transfer header */
87	greg	2.4	if ((rval = checkheader(fin, picfmt, stdout)) < 0) {
88	greg	1.4	fprintf(stderr, "%s: input not a Radiance picture\n",
89			progname);
90			exit(1);
91			}
92	greg	2.4	if (rval)
93			fputformat(picfmt, stdout);
94	greg	1.1	/* add new header info. */
95	greg	1.2	printargs(i, argv, stdout);
96	greg	1.1	putchar('\n');
97			/* get picture size */
98	greg	1.5	if ((order = fgetresolu(&xres, &yres, fin)) < 0) {
99	greg	1.1	fprintf(stderr, "%s: bad picture size\n", progname);
100			exit(1);
101			}
102			/* write new picture size */
103	greg	1.5	fputresolu(neworder(), xres, yres, stdout);
104	greg	1.1	/* goto end if vertical flip */
105			if (fvert)
106			scanfile();
107			flip(); /* flip the image */
108			exit(0);
109	greg	2.10	userr:
110			fprintf(stderr, "Usage: %s [-h][-v][-c] infile [outfile]\n",
111			progname);
112			exit(1);
113	greg	1.1	}
114
115
116	schorsch	2.8	static void
117			memerr(void)
118	greg	1.1	{
119			fprintf(stderr, "%s: out of memory\n", progname);
120			exit(1);
121			}
122
123
124	schorsch	2.8	static void
125			scanfile(void) /* scan to the end of file */
126	greg	1.1	{
127			extern long ftell();
128			COLR *scanin;
129			int y;
130
131			if ((scanpos = (long )malloc(yressizeof(long))) == NULL)
132			memerr();
133			if ((scanin = (COLR )malloc(xressizeof(COLR))) == NULL)
134			memerr();
135	greg	2.3	for (y = yres-1; y > 0; y--) {
136	greg	1.1	scanpos[y] = ftell(fin);
137			if (freadcolrs(scanin, xres, fin) < 0) {
138			fprintf(stderr, "%s: read error\n", progname);
139			exit(1);
140			}
141			}
142	greg	2.3	scanpos[0] = ftell(fin);
143	greg	2.5	free((void *)scanin);
144	greg	1.1	}
145
146
147	schorsch	2.8	static void
148			flip(void) /* flip the picture */
149	greg	1.1	{
150			COLR scanin, scanout;
151			int y;
152			register int x;
153
154			if ((scanin = (COLR )malloc(xressizeof(COLR))) == NULL)
155			memerr();
156			if (fhoriz) {
157			if ((scanout = (COLR )malloc(xressizeof(COLR))) == NULL)
158			memerr();
159			} else
160			scanout = scanin;
161			for (y = yres-1; y >= 0; y--) {
162			if (fvert && fseek(fin, scanpos[yres-1-y], 0) == EOF) {
163			fprintf(stderr, "%s: seek error\n", progname);
164			exit(1);
165			}
166			if (freadcolrs(scanin, xres, fin) < 0) {
167			fprintf(stderr, "%s: read error\n", progname);
168			exit(1);
169			}
170			if (fhoriz)
171			for (x = 0; x < xres; x++)
172			copycolr(scanout[x], scanin[xres-1-x]);
173			if (fwritecolrs(scanout, xres, stdout) < 0) {
174			fprintf(stderr, "%s: write error\n", progname);
175			exit(1);
176			}
177			}
178	greg	2.5	free((void *)scanin);
179	greg	2.3	if (fhoriz)
180	greg	2.5	free((void *)scanout);
181	greg	1.1	}