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/*
*
* (c) Robert Tinsley, 2003 (http://www.thepoacher.net/contact)
*
* Released under the GPL (http://www.fsf.org/licenses/gpl.txt)
*
*
* CHANGES
*
* v1.00 2003-02-28 Original version
*
* v1.10 2003-03-02
* + changed to use pam_* routines rather than ppm_*
* + changed to use pm_* rather than fopen()/fclose()
* + renamed from ppmgrid to pampup9
* + wrote a man-page (actually, html)
*
* Changes by Bryan Henderson for inclusion in the Netpbm package (fully
* exploiting Netpbm library). Renamed to Pampop9. March 2003.
*
*/
#include <stdio.h>
#include <stdlib.h> /* atoi() */
#include "pam.h"
static const char *usagestr = "pnmfile|- xtiles ytiles xdelta ydelta";
int main(int argc, char *argv[])
{
const char *filename = "-";
int xtiles, ytiles, xdelta, ydelta;
FILE *fp;
struct pam spam, dpam;
tuple **spix, *dpix;
int xtilesize, ytilesize, sx, sy, dx, dy, p;
pnm_init(&argc, argv);
if (argc-1 != 5) {
pm_error("Wrong number of arguments. Program requires 5 arguments; "
"you supplied %d. Usage: %s", argc-1, usagestr);
}
filename = argv[1];
xtiles = atoi(argv[2]);
ytiles = atoi(argv[3]);
xdelta = atoi(argv[4]);
ydelta = atoi(argv[5]);
if (filename == NULL || *filename == '\0'
|| xtiles <= 0 || ytiles <= 0 || xdelta < 0 || ydelta < 0)
pm_error("invalid argument");
/* read src pam */
fp = pm_openr(filename);
spix = pnm_readpam(fp, &spam, PAM_STRUCT_SIZE(tuple_type));
pm_close(fp);
/* init dst pam */
xtilesize = spam.width - (xtiles - 1) * xdelta;
ytilesize = spam.height - (ytiles - 1) * ydelta;
if (xtilesize <= 0)
pm_error("xtilesize must be positive. You specified %d", xtilesize);
if (ytilesize <= 0)
pm_error("ytilesize must be positive. You specified %d", ytilesize);
dpam = spam;
dpam.file = stdout;
dpam.width = xtiles * xtilesize;
dpam.height = ytiles * ytilesize;
dpix = pnm_allocpamrow(&dpam);
pnm_writepaminit(&dpam);
/* generate dst pam */
for (dy = 0; dy < dpam.height; dy++) {
sy = ((int) (dy / ytilesize)) * ydelta + (dy % ytilesize);
for (dx = 0; dx < dpam.width; dx++) {
sx = ((int) (dx / xtilesize)) * xdelta + (dx % xtilesize);
for (p = 0; p < spam.depth; ++p) {
dpix[dx][p] = spix[sy][sx][p];
}
}
pnm_writepamrow(&dpam, dpix);
}
/* all done */
pnm_freepamarray(spix, &spam);
pnm_freepamrow(dpix);
exit(EXIT_SUCCESS);
}
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