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#ifndef lint |
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static const char RCSid[] = "$Id: pflip.c,v 2.13 2025/06/06 19:11:21 greg Exp $"; |
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#endif |
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/* |
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* flip picture file horizontally and/or vertically |
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*/ |
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|
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#include "rtio.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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|
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int order; /* input orientation */ |
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int xres, yres; /* resolution (scanlen, nscans) */ |
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|
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long *scanpos; /* scanline positions */ |
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|
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int fhoriz=0, fvert=0; /* flip flags */ |
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|
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int correctorder = 0; /* correcting orientation? */ |
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|
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FILE *fin; /* input file */ |
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|
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|
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static void memerr(void); |
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static void scanfile(void); |
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static void flip(void); |
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|
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|
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static int |
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neworder(void) /* figure out new order from old */ |
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{ |
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register int no; |
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|
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if (correctorder) |
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return(order); /* just leave it */ |
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if ((no = order) & YMAJOR) { |
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if (fhoriz) no ^= XDECR; |
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if (fvert) no ^= YDECR; |
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} else { |
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if (fhoriz) no ^= YDECR; |
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if (fvert) no ^= XDECR; |
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} |
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return(no); |
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} |
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|
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int |
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main( |
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int argc, |
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char *argv[] |
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) |
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{ |
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static char picfmt[MAXFMTLEN] = PICFMT; |
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int i, rval; |
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|
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SET_DEFAULT_BINARY(); |
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SET_FILE_BINARY(stdout); |
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fixargv0(argv[0]); |
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|
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for (i = 1; i < argc; i++) |
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if (!strcmp(argv[i], "-h")) |
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fhoriz++; |
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else if (!strcmp(argv[i], "-v")) |
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fvert++; |
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else if (!strcmp(argv[i], "-c")) |
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correctorder++; |
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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 (!fhoriz && !fvert) |
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fprintf(stderr, "%s: warning - no operation\n", argv[0]); |
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if (i >= argc || argv[i][0] == '-') { |
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if (fvert) |
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goto userr; |
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SET_FILE_BINARY(stdin); |
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fin = stdin; |
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} else if ((fin = fopen(argv[i], "r")) == NULL) { |
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fprintf(stderr, "%s: cannot open\n", argv[i]); |
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exit(1); |
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} |
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if (i < argc-1 && freopen(argv[i+1], "w", stdout) == NULL) { |
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fprintf(stderr, "%s: cannot open\n", argv[i+1]); |
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exit(1); |
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} |
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/* transfer header */ |
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if ((rval = checkheader(fin, picfmt, stdout)) < 0) { |
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fprintf(stderr, "%s: input not a Radiance picture\n", |
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progname); |
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exit(1); |
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} |
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if (rval) |
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fputformat(picfmt, stdout); |
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/* add new header info. */ |
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printargs(i, argv, stdout); |
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putchar('\n'); |
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/* get picture size */ |
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if ((order = fgetresolu(&xres, &yres, fin)) < 0) { |
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fprintf(stderr, "%s: bad picture size\n", progname); |
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exit(1); |
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} |
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/* write new picture size */ |
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fputresolu(neworder(), xres, yres, stdout); |
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/* goto end if vertical flip */ |
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if (fvert) |
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scanfile(); |
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flip(); /* flip the image */ |
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exit(0); |
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userr: |
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fprintf(stderr, "Usage: %s [-h][-v][-c] infile [outfile]\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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static void |
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memerr(void) |
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{ |
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fprintf(stderr, "%s: out of memory\n", progname); |
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exit(1); |
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} |
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|
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|
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static void |
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scanfile(void) /* scan to the end of file */ |
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{ |
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extern long ftell(); |
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COLR *scanin; |
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int y; |
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|
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if ((scanpos = (long *)malloc(yres*sizeof(long))) == NULL) |
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memerr(); |
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if ((scanin = (COLR *)malloc(xres*sizeof(COLR))) == NULL) |
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memerr(); |
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for (y = yres-1; y > 0; y--) { |
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scanpos[y] = ftell(fin); |
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if (freadcolrs(scanin, xres, fin) < 0) { |
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fprintf(stderr, "%s: read error\n", progname); |
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exit(1); |
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} |
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} |
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scanpos[0] = ftell(fin); |
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free((void *)scanin); |
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} |
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|
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|
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static void |
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flip(void) /* flip the picture */ |
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{ |
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COLR *scanin, *scanout; |
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int y; |
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register int x; |
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|
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if ((scanin = (COLR *)malloc(xres*sizeof(COLR))) == NULL) |
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memerr(); |
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if (fhoriz) { |
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if ((scanout = (COLR *)malloc(xres*sizeof(COLR))) == NULL) |
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memerr(); |
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} else |
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scanout = scanin; |
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for (y = yres-1; y >= 0; y--) { |
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if (fvert && fseek(fin, scanpos[yres-1-y], 0) == EOF) { |
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fprintf(stderr, "%s: seek error\n", progname); |
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exit(1); |
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} |
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if (freadcolrs(scanin, xres, fin) < 0) { |
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fprintf(stderr, "%s: read error\n", progname); |
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exit(1); |
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} |
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if (fhoriz) |
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for (x = 0; x < xres; x++) |
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copycolr(scanout[x], scanin[xres-1-x]); |
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if (fwritecolrs(scanout, xres, stdout) < 0) { |
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fprintf(stderr, "%s: write error\n", progname); |
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exit(1); |
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} |
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} |
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free((void *)scanin); |
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if (fhoriz) |
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free((void *)scanout); |
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} |
