Bibliothèque de traitements d'images en virgule flottante. http://la.buvette.org/photos/cumul/
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FloatImg/funcs/geometry.c

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/*
* FLOATIMG
* distorsions géométriques - coredumping ?
*/
#include <stdio.h>
#include <stdlib.h>
#include "../floatimg.h"
/* --------------------------------------------------------------------- */
/*
* really crude function, need more work...
*/
int fimg_halfsize_0(FloatImg *src, FloatImg *dst, int notused)
{
int wd, hd;
int foo, x, y;
float pixel[3];
#if DEBUG_LEVEL
fprintf(stderr, ">>> %s ( %p %p %d )\n", __func__,
src, dst, notused);
#endif
/* no magic check here ? */
if (dst->width || dst->height) {
fprintf(stderr, "*** %s: image at %p not empty\n", __func__, dst);
fimg_describe(dst, "destination halfsize");
return -2;
}
wd = src->width / 2; hd = src->height / 2;
foo = fimg_create(dst, wd, hd, FIMG_TYPE_RGB);
if (foo) {
fprintf(stderr, "%s: err create %d\n", __func__, foo);
return -3;
}
for (y=0; y<hd; y++) {
for (x=0; x<wd; x++) {
foo = fimg_get_rgb(src, x*2, y*2, pixel);
if (foo) {
fprintf(stderr, "%s: err get %d\n", __func__, foo);
abort();
}
foo = fimg_plot_rgb(dst, x, y, pixel[0], pixel[1], pixel[2]);
if (foo) {
fprintf(stderr, "%s: err plot %d\n", __func__, foo);
abort();
}
}
}
return 0;
}
/* --------------------------------------------------------------------- */