FloatImg/Fonderie/glitches.c

/*
 * 		glitches.c
 */

#include  <stdio.h>
#include  <stdlib.h>

#include  "../floatimg.h"

extern int		verbosity;

/*   --------------------------------------------------------------   */
int kill_a_random_line(FloatImg *pvictime, float fval, int bits)
{
int		line, xpos, offset;

#if DEBUG_LEVEL
fprintf(stderr, ">>> %s ( %p %d )\n", __func__, pvictime, bits);
#endif

line = rand() % pvictime->height;

if (verbosity > 1) {
	fprintf(stderr, "%s: try to kill line %d\n", __func__, line);
	}

offset = pvictime->width * line;

for (xpos=0; xpos<pvictime->width; xpos++) {
	if (bits & 1)	pvictime->R[offset+xpos] = fval;
	else		pvictime->R[offset+xpos] = 0.0;
	if (bits & 2)	pvictime->G[offset+xpos] = fval;
	else		pvictime->G[offset+xpos] = 0.0;
	if (bits & 4)	pvictime->B[offset+xpos] = fval;
	else		pvictime->B[offset+xpos] = 0.0;
	}

return 0;
}
/*   --------------------------------------------------------------   */
int kill_a_few_lines(FloatImg *who, float fval, int number)
{
int		idx, foo;

/* Frag the pixels */
for (idx=0; idx<number; idx++) {
	foo = kill_a_random_line(who, fval, rand() & 0x0f);
	if (foo)	abort();
	}

return foo;
}
/*   --------------------------------------------------------------   */