Re: Issue using more than 255 color pairs

[David Unterwandling]

#include <curses.h>
#define BRIGHT 8

void init_colorpairs(int);
unsigned int curses_color(unsigned char, unsigned char);

int main(void)
{
    register int i;

    initscr();
    start_color();
    use_default_colors();

    for (i = 0; i < 8; i++)
        init_colorpairs(i);
}

static void
init_bg(int n, int f, int b)
{
    if (b == COLOR_BLACK || (b % p) > BRIGHT)
        init_pair(n, f, b);

    if (f == COLOR_BLACK)
        n -= BRIGHT;
    else
        n += BRIGHT;

    if (f == (b - BRIGHT))
        init_pair(n, -1, b);
    else
        init_pair(n, f|BRIGHT, b);
}

void
init_colorpairs(int i)
{
    int f, b, n, o, p = 16;
    f = i;
    n = i|BRIGHT;

    if (COLORS < 16) {
        p = 8;

        /* later use bold */
        init_pair(n, f, -1);
    } else
        init_pair(n, f|BRIGHT, -1);

    n = i;
    init_pair(n, f, -1);

    for (i = 0; i < 8; i++) {
        b = i;

        if (b != COLOR_BLACK) {
            if (b == f)
                init_pair(n, -1, b);
            else
                init_pair(n, f, b);

            if (COLORS >= 16) {
                init_bg(n, f, b);

                o = p * BRIGHT - p; n += o;
                init_bg(n, f, b|BRIGHT);
                n -= o;
            }
        } else if (COLORS >= 16) {
            o = p * p - p; n += o;
            init_bg(n, f, b);
            n -= o;
        }
        n += p;
    }
}

unsigned int
curses_color(unsigned char f, unsigned char b)
{
    int p = 16;

    if (COLORS < 16)
        p = 8;

    if (b > 0 && f == 0)
        f = b;

    return f + b * p;
}