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adding HSV->RGB functions, expect garbage

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tth 2020-09-08 23:39:23 +02:00
parent 44165c0a03
commit 8b4603fa21
1 changed files with 49 additions and 1 deletions
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50
funcs/hsv.c
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@ -27,7 +27,11 @@ return (fabsf(a-b)<0.00000000000001); // UGLY HACK ???
}
/* --------------------------------------------------------------------- */
/*
* WARNING : ALL THIS CODE IS SHIT
* WARNING : ALL THIS CODE IS STRANGE
*
www.tutorialspoint.com/c-program-to-change-rgb-color-model-to-hsv-color-model
*/
int fimg_rgb2hsv(float rgb[3], float hsv[3], float scale)
{
@ -62,6 +66,50 @@ fprintf(stderr, "cmin/cmax %f %f\n", cmin, cmax);
return 0;
}
/* --------------------------------------------------------------------- */
int fimg_hsv2rgb(float hsv[3], float rgb[3], float scale)
{
float hh, ff, p, q, t;
long i;
if(hsv[1] <= 0.0) { // < is bogus, just shuts up warnings
rgb[0] = rgb[1] = rgb[2] = hsv[2];
return 0;
}
hh = hsv[0];
if(hh >= 360.0) hh = 0.0;
hh /= 60.0;
i = (long)hh;
ff = hh - i;
p = hsv[2] * (1.0 - hsv[1]);
q = hsv[2] * (1.0 - (hsv[1] * ff));
t = hsv[2] * (1.0 - (hsv[1] * (1.0 - ff)));
switch(i) {
case 0:
rgb[0] = hsv[2]; rgb[1] = t; rgb[2] = p;
break;
case 1:
rgb[0] = q; rgb[1] = hsv[2]; rgb[2] = p;
break;
case 2:
rgb[0] = p; rgb[1] = hsv[2]; rgb[2] = t;
break;
case 3:
rgb[0] = p; rgb[1] = q; rgb[2] = hsv[2];
break;
case 4:
rgb[0] = t; rgb[1] = p; rgb[2] = hsv[2];
break;
case 5:
default:
rgb[0] = hsv[2]; rgb[1] = p; rgb[2] = q;
break;
}
return 0;
}
/* --------------------------------------------------------------------- */
int fimg_essai_hsv(char *fname)
{