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/*
* $Id: parse_rgb.h,v 1.5 2020/02/02 23:34:34 tom Exp $
*
* Sample implementation of ncurses RGB extension from user_caps(5).
*/
#ifndef PARSE_RBG_H_incl
#define PARSE_RBG_H_incl 1
#include <test.priv.h>
#if HAVE_TIGETSTR && USE_WIDEC_SUPPORT
static int
parse_rgb(int *r_max, int *g_max, int *b_max)
{
int colors = tigetnum("colors");
int result = ERR;
*r_max = *g_max = *b_max = 0;
if (colors > 0) {
int max_bits;
int bits;
int pwr2;
int r = 0, g = 0, b = 0;
char *data;
char ch;
for (max_bits = 0, pwr2 = 1;
pwr2 < colors;
++max_bits, pwr2 <<= 1) {
;
}
if (tigetflag("RGB") > 0) {
result = OK;
r = g = b = (max_bits + 2) / 3;
} else if ((bits = tigetnum("RGB")) > 0) {
result = OK;
r = g = b = bits;
} else if ((data = tigetstr("RGB")) != ABSENT_STRING
&& data != CANCELLED_STRING
&& sscanf(data, "%d/%d/%d%c", &r, &g, &b, &ch) == 3) {
result = OK;
}
if ((r + g + b) < max_bits) {
result = ERR;
} else if (result == 0) {
if (r > max_bits) {
r = max_bits;
g = b = 0;
}
*r_max = r;
if (g > (max_bits -= r)) {
g = max_bits;
b = 0;
}
*g_max = g;
if (b > (max_bits -= g)) {
b = max_bits;
}
*b_max = b;
}
}
return result;
}
#else
#define parse_rgb(r,g,b) (ERR)
#endif
#endif /* PARSE_RBG_H_incl */
