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/* Copyright (c) 1991 Regents of the University of California */ |
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|
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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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/* |
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* flip picture file horizontally and/or vertically |
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*/ |
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|
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#include <stdio.h> |
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|
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#include "color.h" |
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|
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int xres, yres; /* input resolution */ |
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|
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long *scanpos; /* scanline positions */ |
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|
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int fhoriz, fvert; /* flip flags */ |
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|
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FILE *fin; /* input file */ |
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|
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char *progname; |
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|
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|
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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 i; |
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|
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progname = 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 |
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break; |
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if (i >= argc || argv[i][0] == '-') { |
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fprintf(stderr, "Usage: %s [-h][-v] infile [outfile]\n", |
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progname); |
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exit(1); |
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} |
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if ((fin = fopen(argv[i], "r")) == NULL) { |
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fprintf(stderr, "%s: cannot open\n", argv[1]); |
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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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copyheader(fin, 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 (fgetresolu(&xres, &yres, fin) != (YMAJOR|YDECR)) { |
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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(YMAJOR|YDECR, 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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} |
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|
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|
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memerr() |
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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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scanfile() /* 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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free((char *)scanin); |
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} |
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|
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|
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flip() /* 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((char *)scanin); |
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free((char *)scanout); |
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} |
