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#ifndef lint |
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static const char RCSid[] = "$Id: psum.c,v 2.7 2004/01/02 12:47:01 schorsch Exp $"; |
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#endif |
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/* |
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* psum.c - program to sum pictures. |
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* |
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* 10/14/86 |
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*/ |
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|
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#include <stdio.h> |
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#include <math.h> |
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|
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#include "color.h" |
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#include "resolu.h" |
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#include "rterror.h" |
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|
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|
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#define MAXFILE 8 |
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|
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int xsiz, ysiz; |
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|
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char *progname; |
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|
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char *fname[MAXFILE]; /* the file names */ |
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FILE *fptr[MAXFILE]; /* the file pointers */ |
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COLOR scale[MAXFILE]; /* scaling factors */ |
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int nfile; /* number of files */ |
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|
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static gethfunc tabputs; |
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static void psum(void); |
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|
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|
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|
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static int |
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tabputs( /* print line preceded by a tab */ |
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char *s, |
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void *p |
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) |
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{ |
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putc('\t', stdout); |
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return(fputs(s, stdout)); |
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} |
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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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double d; |
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int xres, yres; |
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int an; |
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|
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progname = argv[0]; |
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|
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nfile = 0; |
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setcolor(scale[0], 1.0, 1.0, 1.0); |
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|
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for (an = 1; an < argc; an++) { |
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if (nfile >= MAXFILE) { |
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fprintf(stderr, "%s: too many files\n", progname); |
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quit(1); |
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} |
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if (argv[an][0] == '-') |
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switch (argv[an][1]) { |
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case 's': |
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d = atof(argv[an+1]); |
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switch (argv[an][2]) { |
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case '\0': |
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scalecolor(scale[nfile], d); |
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break; |
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case 'r': |
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colval(scale[nfile],RED) *= d; |
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break; |
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case 'g': |
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colval(scale[nfile],GRN) *= d; |
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break; |
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case 'b': |
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colval(scale[nfile],BLU) *= d; |
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break; |
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default: |
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goto unkopt; |
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} |
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an++; |
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continue; |
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case '\0': |
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fptr[nfile] = stdin; |
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fname[nfile] = "<stdin>"; |
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break; |
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default:; |
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unkopt: |
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fprintf(stderr, "%s: unknown option: %s\n", |
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progname, argv[an]); |
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quit(1); |
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} |
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else if ((fptr[nfile] = fopen(argv[an], "r")) == NULL) { |
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fprintf(stderr, "%s: can't open file: %s\n", |
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progname, argv[an]); |
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quit(1); |
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} else |
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fname[nfile] = argv[an]; |
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/* get header */ |
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fputs(fname[nfile], stdout); |
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fputs(":\n", stdout); |
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getheader(fptr[nfile], tabputs, NULL); |
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/* get picture size */ |
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if (fgetresolu(&xres, &yres, fptr[nfile]) != (YMAJOR|YDECR)) { |
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fprintf(stderr, "%s: bad picture size\n", progname); |
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quit(1); |
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} else if (nfile == 0) { |
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xsiz = xres; |
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ysiz = yres; |
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} else if (xres != xsiz || yres != ysiz) { |
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fprintf(stderr, "%s: pictures are different sizes\n", |
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progname); |
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quit(1); |
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} |
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nfile++; |
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setcolor(scale[nfile], 1.0, 1.0, 1.0); |
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} |
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/* add new header info. */ |
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printargs(argc, argv, stdout); |
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putchar('\n'); |
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fputresolu(YMAJOR|YDECR, xsiz, ysiz, stdout); |
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|
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psum(); |
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|
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quit(0); |
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return 0; /* pro forma return */ |
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} |
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|
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|
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static void |
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psum(void) /* sum the files */ |
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{ |
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COLOR *scanin, *scanout; |
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int y, i; |
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register int x; |
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|
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scanin = (COLOR *)malloc(xsiz*sizeof(COLOR)); |
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scanout = (COLOR *)malloc(xsiz*sizeof(COLOR)); |
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if (scanin == NULL || scanout == NULL) { |
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fprintf(stderr, "%s: out of memory\n", progname); |
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quit(1); |
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} |
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for (y = ysiz-1; y >= 0; y--) { |
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for (x = 0; x < xsiz; x++) |
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setcolor(scanout[x], 0.0, 0.0, 0.0); |
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for (i = 0; i < nfile; i++) { |
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if (freadscan(scanin, xsiz, fptr[i]) < 0) { |
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fprintf(stderr, "%s: read error on file: %s\n", |
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progname, fname[i]); |
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quit(1); |
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} |
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for (x = 0; x < xsiz; x++) |
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multcolor(scanin[x], scale[i]); |
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for (x = 0; x < xsiz; x++) |
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addcolor(scanout[x], scanin[x]); |
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} |
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if (fwritescan(scanout, xsiz, stdout) < 0) { |
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fprintf(stderr, "%s: write error\n", progname); |
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quit(1); |
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} |
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} |
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free((void *)scanin); |
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free((void *)scanout); |
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} |
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|
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|
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void |
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quit( /* exit gracefully */ |
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int code |
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) |
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{ |
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exit(code); |
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} |
