Bibliothèque de traitements d'images en virgule flottante. http://la.buvette.org/photos/cumul/
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/*
* interpolate.c
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <string.h>
#include <math.h>
#include "../floatimg.h"
extern int verbosity;
/* ---------------------------------------------------------------- */
static int gray_interpolate(FloatImg *s1, FloatImg *s2, FloatImg *d, float coef)
{
int picsize, idx;
picsize = d->width * d->height;
for (idx=0; idx<picsize; idx++) {
d->R[idx] = (coef * s1->R[idx]) + ((1.0-coef) * s2->R[idx]);
}
return 0;
}
/* ---------------------------------------------------------------- */
static int rgb_interpolate(FloatImg *s1, FloatImg *s2, FloatImg *d, float coef)
{
int picsize, idx;
picsize = d->width * d->height;
for (idx=0; idx<picsize; idx++) {
d->R[idx] = (coef * s1->R[idx]) + ((1.0-coef) * s2->R[idx]);
d->G[idx] = (coef * s1->G[idx]) + ((1.0-coef) * s2->G[idx]);
d->B[idx] = (coef * s1->B[idx]) + ((1.0-coef) * s2->B[idx]);
}
return 0;
}
/* ---------------------------------------------------------------- */
int fimg_interpolate(FloatImg *s1, FloatImg *s2, FloatImg *d, float coef)
{
int foo;
#if DEBUG_LEVEL
fprintf(stderr, ">>> %s ( %p %p %p %f )\n", __func__,
s1, s2, d, coef);
#endif
foo = fimg_images_not_compatible(s1, s2);
if (foo) {
fprintf(stderr, "compat s1 s2 -> %d\n", foo);
return foo;
}
foo = fimg_images_not_compatible(s1, d);
if (foo) {
fprintf(stderr, "compat s1 d -> %d\n", foo);
return foo;
}
switch (s1->type) {
case FIMG_TYPE_GRAY:
gray_interpolate (s1, s2, d, coef); break;
case FIMG_TYPE_RGB:
rgb_interpolate (s1, s2, d, coef); break;
default:
fprintf(stderr, "%s, %d is a bad type\n", __func__, s1->type);
return -18;
}
return 0;
}
/* ---------------------------------------------------------------- */