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/*********************************************************************/
/* pgmnoise - create a portable graymap with white noise */
/* Frank Neumann, October 1993 */
/* V1.1 16.11.1993 */
/* */
/* version history: */
/* V1.0 12.10.1993 first version */
/* V1.1 16.11.1993 Rewritten to be NetPBM.programming conforming */
/*********************************************************************/
#include "pgm.h"
int main(int argc,
char * argv[]) {
int argn, rows, cols;
unsigned int row;
gray * destrow;
const char * const usage = "width height\n width and height are picture dimensions in pixels\n";
/* parse in 'default' parameters */
pgm_init(&argc, argv);
argn = 1;
/* parse in dim factor */
if (argn == argc)
pm_usage(usage);
if (sscanf(argv[argn], "%d", &cols) != 1)
pm_usage(usage);
argn++;
if (argn == argc)
pm_usage(usage);
if (sscanf(argv[argn], "%d", &rows) != 1)
pm_usage(usage);
if (cols <= 0 || rows <= 0)
pm_error("picture dimensions should be positive numbers");
++argn;
if (argn != argc)
pm_usage(usage);
destrow = pgm_allocrow(cols);
pgm_writepgminit(stdout, cols, rows, PGM_MAXMAXVAL, 0);
srand(pm_randseed());
/* create the (gray) noise */
for (row = 0; row < rows; ++row) {
unsigned int col;
for (col = 0; col < cols; ++col)
destrow[col] = rand() % PGM_MAXMAXVAL;
pgm_writepgmrow(stdout, destrow, cols, PGM_MAXMAXVAL, 0);
}
pgm_freerow(destrow);
return 0;
}
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