FloatImg4PythonBinding/funcs/falsecolors.c

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/*
* FloatImg library from tTh - really ugly code inside
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*
* F A L S E C O L O R S
* or fake colors ?
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*/
#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
#include <sys/time.h>
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#include <math.h>
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#include "../floatimg.h"
/* -------------------------------------------------------------- */
/* this is a global vars exported from main */
extern int verbosity;
/* -------------------------------------------------------------- */
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/* TRUCS A VOIR
f(x,y) = (((y & x) * (y - x)) % ((21 & x) * (y | 8))) ^ (~((x & 7) | (x % x)))
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*/
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/* -------------------------------------------------------------- */
/* nouveau 18 mai 2022 */
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/* please explain the meaning of 'valf' parameter */
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int fimg_falsecolors_0(FloatImg *src, FloatImg *dst, int k, float valf)
{
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int x, y, offset;
float r, g, b, gray, maxv;
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#if DEBUG_LEVEL
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fprintf(stderr, ">>> %s ( %p %p %d %f )\n", __func__,
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src, dst, k, valf);
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#endif
if (k) {
fprintf(stderr, "%s : %d %f\n", __func__, k, valf);
}
/* check validity of parameters */
if (FIMG_TYPE_RGB != dst->type) {
fprintf(stderr, "in %s, picz at %p is not valid\n",
__func__, dst);
abort();
/* BLAM! */
}
maxv = fimg_get_plane_maxvalue(src, 'r');
fprintf(stderr, "%s: maxv of red plane = %f\n", __func__, maxv);
/* enter big loop */
offset = 0;
for (y=0; y<src->height; y++) {
for (x=0; x<src->width; x++) {
gray = src->R[offset];
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if (gray < maxv/2.0) {
r = gray * 2.0;
g = 0.0;
}
else {
r = 0.0;
g = gray * 2.0;
}
b = fmodf(gray*8.0, maxv);
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dst->R[offset] = r;
dst->G[offset] = g;
dst->B[offset] = b;
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/* and GOTO next pixel */
offset++;
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}
}
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return 0;
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}
/* -------------------------------------------------------------- */