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space.cpp
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space.cpp
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/***
space.cpp
RGB-to-HSV and HSV-to-RGB conversions,
generic color space stuff
Copyright (c) Chris Street, 2002-2022
***/
#include "libcodehappy.h"
#include <math.h>
void RGB_HSV(int r, int g, int b, int *h, int *s, int *v) {
/*
red-green-blue to hue-saturation-value
scale: all from 0 to 255
*/
double rr, gg, bb;
double min, max, delta;
double hh, ss, vv;
rr = r / 255.;
gg = g / 255.;
bb = b / 255.;
min = (rr < gg ? rr : gg);
min = (bb < min ? bb : min);
max = (rr > gg ? rr : gg);
max = (bb > max ? bb : max);
vv = max;
delta = (max - min);
if (delta == 0.) { /* straight equality is OK, delta is an integer */
*s = 0;
*h = r;
*v = r; /* zero chromality */
return;
}
if (max != 0.)
ss = delta / max;
else {
*h = 0;
*s = 0;
*v = 0;
return;
}
if (rr == max)
hh = (gg - bb) / delta;
else if (g == max)
hh = 2 + (bb - rr) / delta;
else
hh = 4 + (rr - gg) / delta;
hh *= 60.;
if (hh < 0.)
hh += 360.;
*h = (int)(hh * 255. / 360.) & 0xff;
*s = (int)(ss * 255.) & 0xff;
*v = (int)(vv * 255.) & 0xff;
}
void HSV_RGB(int h, int s, int v, int *r, int *g, int *b) {
int i;
double f, p, q, t;
double rr, gg, bb, hh, ss, vv;
hh = (double)(h) * 360. / 255.;
ss = (double)s / 255.;
vv = (double)v / 255.;
hh /= 60.;
i = floor(hh);
f = hh - i;
p = vv * (1. - ss);
q = vv * (1. - ss * f);
t = vv * (1. - ss * (1 - f));
switch (i) {
case 0:
rr = vv;
gg = t;
bb = p;
break;
case 1:
rr = q;
gg = vv;
bb = p;
break;
case 2:
rr = p;
gg = vv;
bb = t;
break;
case 3:
rr = p;
gg = q;
bb = vv;
break;
case 4:
rr = t;
gg = p;
bb = vv;
break;
default:
rr = vv;
gg = p;
bb = q;
break;
}
*r = (int)floor(rr * 255. + 0.5);
*g = (int)floor(gg * 255. + 0.5);
*b = (int)floor(bb * 255. + 0.5);
if (*r < 0) *r = 0;
if (*r > 255) *r = 255;
if (*g < 0) *g = 0;
if (*g > 255) *g = 255;
if (*b < 0) *b = 0;
if (*b > 255) *b = 255;
}
void RGB_YIQ(int r, int g, int b, int *y, int *i, int *q) {
double yy, ii, qq;
yy = 0.299 * r + 0.587 * g + 0.114 * b;
ii = 0.596 * r - 0.275 * g - 0.321 * b;
qq = 0.212 * r - 0.523 * g + 0.311 * b;
/* normalize */
ii += 151.98;
ii *= (255. / 303.96);
qq += 133.365;
qq *= (255. / 266.73);
*y = (int)(yy) & 0xff;
*i = (int)(ii) & 0xff;
*q = (int)(qq) & 0xff;
}
void YIQ_RGB(int y, int i, int q, int *r, int *g, int *b) {
double rr, gg, bb;
double ii, qq;
/* normalize */
ii = i*(303.96 / 255.);
ii -= 151.98;
qq = q*(266.73 / 255.);
qq -= 133.365;
rr = y + 0.956 * ii + 0.621 * qq;
gg = y - 0.272 * ii - 0.647 * qq;
bb = y - 1.105 * ii + 1.702 * qq;
rr = (rr < 0. ? 0. : rr);
rr = (rr > 255. ? 255. : rr);
gg = (gg < 0. ? 0. : gg);
gg = (gg > 255. ? 255. : gg);
bb = (bb < 0. ? 0. : bb);
bb = (bb > 255. ? 255. : bb);
*r = (int)(rr) & 0xff;
*g = (int)(gg) & 0xff;
*b = (int)(bb) & 0xff;
}
void RGB_YCbCr_601(int r, int g, int b, int *y, int *cb, int *cr) {
double yy, ccb, ccr;
yy = 0.2989 * r + 0.5866 * g + 0.1145 * b;
ccb = -0.1687 * r - 0.3312 * g + 0.5 * b;
ccr = 0.5 * r - 0.4183 * g - 0.0816 * b;
ccb += 128.;
ccr += 128.;
ccb = (ccb > 255. ? 255. : ccb);
ccb = (ccb < 0 ? 0 : ccb);
ccr = (ccr > 255. ? 255. : ccr);
ccr = (ccr < 0 ? 0 : ccr);
*y = (int)(yy) & 0xff;
*cb = (int)(ccb) & 0xff;
*cr = (int)(ccr) & 0xff;
}
void YCbCr_601_RGB(int y, int cb, int cr, int *r, int *g, int *b, int brightness_adjust) {
double yy, ccb, ccr;
double rr, gg, bb;
yy = (y+brightness_adjust) / 255.;
ccb = (cb / 255.) - 0.5;
ccr = (cr / 255.) - 0.5;
rr = yy + 1.4022 * ccr;
gg = yy - 0.3456 * ccb - 0.7145 * ccr;
bb = yy + 1.7710 * ccb;
rr = (rr < 0. ? 0. : rr);
rr = (rr > 1. ? 1. : rr);
gg = (gg < 0. ? 0. : gg);
gg = (gg > 1. ? 1. : gg);
bb = (bb < 0. ? 0. : bb);
bb = (bb > 1. ? 1. : bb);
*r = (int)(rr * 255.) & 0xff;
*g = (int)(gg * 255.) & 0xff;
*b = (int)(bb * 255.) & 0xff;
}
void interpolate_color(int r1, int g1, int b1,
int r2, int g2, int b2,
int *ri, int *gi, int *bi,
int interp) {
*ri = (r1 * interp) + (r2 * (1000 - interp));
*ri /= 1000;
*gi = (g1 * interp) + (g2 * (1000 - interp));
*gi /= 1000;
*bi = (b1 * interp) + (b2 * (1000 - interp));
*bi /= 1000;
}
void interpolate_rgbcolor(RGBColor rgb1, RGBColor rgb2, RGBColor* rgb_out, int interp) {
int r1, g1, b1, r2, g2, b2, ri, gi, bi;
r1 = RGB_RED(rgb1);
r2 = RGB_RED(rgb2);
g1 = RGB_GREEN(rgb1);
g2 = RGB_GREEN(rgb2);
b1 = RGB_BLUE(rgb1);
b2 = RGB_BLUE(rgb2);
r1 = COMPONENT_RANGE(r1);
r2 = COMPONENT_RANGE(r2);
g1 = COMPONENT_RANGE(g1);
g2 = COMPONENT_RANGE(g2);
b1 = COMPONENT_RANGE(b1);
b2 = COMPONENT_RANGE(b2);
interpolate_color(r1, g1, b1, r2, g2, b2, &ri, &gi, &bi, interp);
*rgb_out = RGB_NO_CHECK(ri, gi, bi);
return;
}
/* end space.cpp */