Bibliothèque de traitements d'images en virgule flottante. http://la.buvette.org/photos/cumul/
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/*
* Detection de contours
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <math.h>
#include "../floatimg.h"
extern int verbosity;
/* --------------------------------------------------------------------- */
/* nouveau 4 octobre 2020, juste avant sonoptic de la pluie craignos */
int fimg_contour_2x2(FloatImg *psrc, FloatImg *pdst, int reverse)
{
float avg[4];
int foo, x, y, q;
float v1, v2;
int tbl[] = /* deep magic inside */
{
0, 1, 1, 1,
1, 1, 0, 1,
1, 0, 1, 1,
1, 1, 1, 0
}; /* please explain */
#if DEBUG_LEVEL
fprintf(stderr, ">>> %s ( %p %p %d )\n", __func__, psrc, pdst, reverse);
#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;
}
if (reverse) {
v1 = 0.0; v2 = 1.0;
}
else {
v1 = 1.0; v2 = 0.0;
}
foo = fimg_meanvalues(psrc, avg);
if (foo) {
fprintf(stderr, "%s: err %d on fimg_meanvalues\n", __func__, foo);
return foo;
}
if (verbosity > 1) {
fprintf(stderr, "%s: %f %f %f\n", __func__, avg[0], avg[1], avg[2]);
}
#define RP(ix, iy) ( psrc->R[((iy)*psrc->width)+(ix)] < avg[0] )
#define GP(ix, iy) ( psrc->G[((iy)*psrc->width)+(ix)] < avg[1] )
#define BP(ix, iy) ( psrc->B[((iy)*psrc->width)+(ix)] < avg[2] )
for (y=0; y<psrc->height-1; y++) {
for (x=0; x<psrc->width-1; x++) {
q = ( ( RP(x, y) << 3 ) |
( RP(x+1, y) << 2 ) |
( RP(x, y+1) << 1 ) |
( RP(x+1, y+1) ) );
pdst->R[(y*psrc->width)+x] = tbl[q] ? v1 : v2 ;
q = ( ( GP(x, y) << 3 ) |
( GP(x+1, y) << 2 ) |
( GP(x, y+1) << 1 ) |
( GP(x+1, y+1) ) );
pdst->G[(y*psrc->width)+x] = tbl[q] ? v1 : v2 ;
q = ( ( BP(x, y) << 3 ) |
( BP(x+1, y) << 2 ) |
( BP(x, y+1) << 1 ) |
( BP(x+1, y+1) ) );
pdst->B[(y*psrc->width)+x] = tbl[q] ? v1 : v2 ;
}
}
/* kill potential NaN values in last row or last column */
fimg_killborders(pdst);
return 0;
}
/* --------------------------------------------------------------------- */