Bibliothèque de traitements d'images en virgule flottante. http://la.buvette.org/photos/cumul/
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/*
* displacement.c
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <math.h>
#include "../floatimg.h"
extern int verbosity;
/* --------------------------------------------------------------------- */
/* nouveau 24 octobre 2020, pendant le masque-flamme coronavidique */
int fimg_displacement_0(FloatImg *psrc, FloatImg *pdst, int flags)
{
int x, y, foo;
float minmax[6];
float rgb[3];
float dltr, dltg, dltb; /* delta des minmax */
float dispx, dispy;
int dstx, dsty;
int in, out;
#if DEBUG_LEVEL
fprintf(stderr, ">>> %s ( %p %p 0x%04x )\n", __func__, psrc, pdst, flags);
#endif
if (FIMG_TYPE_RGB != psrc->type) {
fprintf(stderr, "%s: bad src type %d\n", __func__, psrc->type);
return -7;
}
if (fimg_images_not_compatible(psrc, pdst)) {
fprintf(stderr, "%s: bad dst type %d\n", __func__, pdst->type);
return -8;
}
foo = fimg_get_minmax_rgb(psrc, minmax);
if (verbosity) {
fimg_print_minmax(minmax, (char *)__func__);
}
dltr = minmax[1] - minmax[0];
dltg = minmax[3] - minmax[2];
dltb = minmax[5] - minmax[4];
in = out = 0;
/*
* BE WARNED !
* This code doesn't work as expected, so I have to
* rewrite it, maybe when the pandemic is closed...
*/
for (y=0; y<psrc->height; y++) {
for (x=0; x<psrc->width; x++) {
fimg_get_rgb(psrc, x, y, rgb);
dispx = (float)x + (rgb[1]/dltg * 20.0);
dispy = (float)y + (rgb[2]/dltb * 20.0);
dstx = (int)roundf(dispx - 10.0);
dsty = (int)roundf(dispy - 10.0);
if ( (dstx < 0) || (dsty < 0) ||
(dstx >= psrc->width) ||
(dsty >= psrc->height) )
{
/* OUT OF DESTINATION PICTURE */
out++;
}
else {
if (flags & 1) {
/* going monochrome */
rgb[1] = rgb[2] = rgb[0];
}
fimg_put_rgb(pdst, dstx, dsty, rgb);
in++;
}
}
}
if (verbosity) fprintf(stderr, "%s -> in %d out %d\n", __func__, in, out);
return 0;
}
/* --------------------------------------------------------------------- */