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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/stdio/stdio.h"
#define DIST(X, Y) ((X) - (Y))
#define SQR(X) ((X) * (X))
#define SUM(X, Y, Z) ((X) + (Y) + (Z))
static const uint8_t kXtermCube[] = {0, 0137, 0207, 0257, 0327, 0377};
static int uncube(int x) {
return x < 48 ? 0 : x < 115 ? 1 : (x - 35) / 40;
}
static int rgb2xterm256(int r, int g, int b) {
unsigned av, ir, ig, ib, il, qr, qg, qb, ql;
av = (r + g + b) / 3;
ql = (il = av > 238 ? 23 : (av - 3) / 10) * 10 + 8;
qr = kXtermCube[(ir = uncube(r))];
qg = kXtermCube[(ig = uncube(g))];
qb = kXtermCube[(ib = uncube(b))];
if (SUM(SQR(DIST(qr, r)), SQR(DIST(qg, g)), SQR(DIST(qb, b))) <=
SUM(SQR(DIST(ql, r)), SQR(DIST(ql, g)), SQR(DIST(ql, b)))) {
return ir * 36 + ig * 6 + ib + 020;
} else {
return il + 0350;
}
}
bool IsUglyColorMixture(int rune, int y, int tone, bool toneisfg) {
assert(tone == 16 || (231 <= tone && tone <= 255));
return false;
}
int main(int argc, char *argv[]) {
unsigned y, z, x, k, w;
static const char16_t s[2][3] = {{u'', u'', u''}, {u'', u'', u''}};
printf("\npure\n");
for (y = 0; y < 6; ++y) {
for (z = 0; z < 6; ++z) {
for (x = 0; x < 6; ++x) {
printf("\033[48;5;%hhum ", 16 + x + y * 6 + z * 6 * 6);
}
printf("\033[0m ");
}
printf("\n");
}
#define MIX(NAME, COLOR) \
do { \
printf("\n%s %d ▓░/▒▒/░▓\n", NAME, COLOR); \
for (k = 0; k < 3; ++k) { \
for (y = 0; y < 6; ++y) { \
for (z = 0; z < 6; ++z) { \
for (x = 0; x < 6; ++x) { \
printf("\033[48;5;%hhu;38;5;%hhum%lc", COLOR, \
16 + x + y * 6 + z * 6 * 6, s[0][k]); \
printf("\033[48;5;%hhu;38;5;%hhum%lc", 16 + x + y * 6 + z * 6 * 6, \
COLOR, s[1][k]); \
} \
printf("\033[0m "); \
} \
printf("\n"); \
} \
} \
} while (0)
MIX("tint", 231);
MIX("tint", 255);
MIX("tint", 254);
MIX("tone", 240);
MIX("shade", 232);
for (w = 233; w < 254; ++w) {
MIX("gray", w);
}
return 0;
}