/*
 *		OPERATORS
 *
 *
 */

#include  <stdio.h>
#include  <stdlib.h>
#include  <unistd.h>
#include  <string.h>
#include  <math.h>

#include  "../floatimg.h"

extern int verbosity;		/* must be declared around main() */

/* ---------------------------------------------------------------- */
int fimg_add(FloatImg *a, FloatImg *b, FloatImg *d)
{
int		idx, nbiter;

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

if (3 != a->type || 3 != b->type || 3 != d->type) {
	fprintf(stderr, "%s : got a bad type fimg\n", __func__);
	return -8;
	} 

nbiter = a->width * a->height;

for (idx=0; idx<nbiter; idx++) {
	d->R[idx] = a->R[idx] + b->R[idx];
	d->G[idx] = a->G[idx] + b->G[idx];
	d->B[idx] = a->B[idx] + b->B[idx];
	}

return -1;
}
/* ---------------------------------------------------------------- */
/*
 *		A - B -> D
 */
int fimg_sub(FloatImg *a, FloatImg *b, FloatImg *d)
{
int		idx, nbiter;

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

if (3 != a->type || 3 != b->type || 3 != d->type) {
	fprintf(stderr, "%s : got a bad type fimg\n", __func__);
	return -8;
	} 

nbiter = a->width * a->height;

for (idx=0; idx<nbiter; idx++) {
	d->R[idx] = fabs(a->R[idx] - b->R[idx]);
	d->G[idx] = fabs(a->G[idx] - b->G[idx]);
	d->B[idx] = fabs(a->B[idx] - b->B[idx]);
	}

return -1;
}
/* ---------------------------------------------------------------- */
/* ---------------------------------------------------------------- */
/*
 *		A * B -> D
 */
int fimg_mul(FloatImg *a, FloatImg *b, FloatImg *d)
{
int		idx, nbiter;

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

if (3 != a->type || 3 != b->type || 3 != d->type) {
	fprintf(stderr, "%s : got a bad type fimg\n", __func__);
	return -8;
	} 

nbiter = a->width * a->height;

for (idx=0; idx<nbiter; idx++) {
	d->R[idx] = a->R[idx] * b->R[idx];
	d->G[idx] = a->G[idx] * b->G[idx];
	d->B[idx] = a->B[idx] * b->B[idx];
	}

return -1;
}
/* ---------------------------------------------------------------- */