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greg |
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/* Copyright (c) 1988 Regents of the University of California */ |
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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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* prot.c - program to rotate picture file 90 degrees clockwise. |
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* |
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* 2/26/88 |
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*/ |
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#include <stdio.h> |
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#include "color.h" |
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int xres, yres; /* input resolution */ |
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char buf[1<<20]; /* output buffer */ |
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int nrows; /* number of rows output at once */ |
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#define scanbar ((COLR *)buf) |
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char *progname; |
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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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FILE *fin; |
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progname = argv[0]; |
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if (argc != 2 && argc != 3) { |
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fprintf(stderr, "Usage: %s infile [outfile]\n", progname); |
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exit(1); |
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} |
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if ((fin = fopen(argv[1], "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 (argc == 3 && freopen(argv[2], "w", stdout) == NULL) { |
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fprintf(stderr, "%s: cannot open\n", argv[2]); |
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exit(1); |
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} |
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/* copy header */ |
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while (fgets(buf, sizeof(buf), fin) != NULL && buf[0] != '\n') |
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fputs(buf, stdout); |
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/* add new header info. */ |
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printf("%s\n\n", progname); |
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/* get picture size */ |
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if (fgets(buf, sizeof(buf), fin) == NULL || |
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sscanf(buf, "-Y %d +X %d\n", &yres, &xres) != 2) { |
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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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printf("-Y %d +X %d\n", xres, yres); |
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/* compute buffer capacity */ |
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nrows = sizeof(buf)/sizeof(COLR)/yres; |
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rotate(fin); /* rotate the image */ |
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exit(0); |
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} |
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rotate(fp) /* rotate picture */ |
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FILE *fp; |
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{ |
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register COLR *inline; |
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register int xoff, inx, iny; |
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long start, ftell(); |
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if ((inline = (COLR *)malloc(xres*sizeof(COLR))) == NULL) { |
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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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start = ftell(fp); |
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for (xoff = 0; xoff < xres; xoff += nrows) { |
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if (fseek(fp, start, 0) < 0) { |
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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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for (iny = yres-1; iny >= 0; iny--) { |
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if (freadcolrs(inline, xres, fp) < 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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for (inx = 0; inx < nrows && xoff+inx < xres; inx++) |
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bcopy(inline[xoff+inx], scanbar[inx*yres+iny], |
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sizeof(COLR)); |
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} |
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for (inx = 0; inx < nrows && xoff+inx < xres; inx++) |
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if (fwritecolrs(scanbar+inx*yres, yres, 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 *)inline); |
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} |
