mirror of https://github.com/tmux/tmux.git
253 lines
6.9 KiB
C
253 lines
6.9 KiB
C
/* $OpenBSD$ */
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/*
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* Copyright (c) 2008 Nicholas Marriott <nicholas.marriott@gmail.com>
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* Copyright (c) 2016 Avi Halachmi <avihpit@yahoo.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
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* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include "tmux.h"
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static int
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colour_dist_sq(int R, int G, int B, int r, int g, int b)
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{
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return ((R - r) * (R - r) + (G - g) * (G - g) + (B - b) * (B - b));
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}
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static int
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colour_to_6cube(int v)
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{
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if (v < 48)
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return (0);
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if (v < 114)
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return (1);
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return ((v - 35) / 40);
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}
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/*
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* Convert an RGB triplet to the xterm(1) 256 colour palette.
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*
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* xterm provides a 6x6x6 colour cube (16 - 231) and 24 greys (232 - 255). We
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* map our RGB colour to the closest in the cube, also work out the closest
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* grey, and use the nearest of the two.
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*
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* Note that the xterm has much lower resolution for darker colors (they are
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* not evenly spread out), so our 6 levels are not evenly spread: 0x0, 0x5f
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* (95), 0x87 (135), 0xaf (175), 0xd7 (215) and 0xff (255). Greys are more
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* evenly spread (8, 18, 28 ... 238).
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*/
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int
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colour_find_rgb(u_char r, u_char g, u_char b)
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{
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static const int q2c[6] = { 0x00, 0x5f, 0x87, 0xaf, 0xd7, 0xff };
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int qr, qg, qb, cr, cg, cb, d, idx;
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int grey_avg, grey_idx, grey;
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/* Map RGB to 6x6x6 cube. */
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qr = colour_to_6cube(r); cr = q2c[qr];
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qg = colour_to_6cube(g); cg = q2c[qg];
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qb = colour_to_6cube(b); cb = q2c[qb];
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/* If we have hit the colour exactly, return early. */
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if (cr == r && cg == g && cb == b)
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return ((16 + (36 * qr) + (6 * qg) + qb) | COLOUR_FLAG_256);
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/* Work out the closest grey (average of RGB). */
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grey_avg = (r + g + b) / 3;
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if (grey_avg > 238)
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grey_idx = 23;
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else
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grey_idx = (grey_avg - 3) / 10;
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grey = 8 + (10 * grey_idx);
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/* Is grey or 6x6x6 colour closest? */
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d = colour_dist_sq(cr, cg, cb, r, g, b);
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if (colour_dist_sq(grey, grey, grey, r, g, b) < d)
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idx = 232 + grey_idx;
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else
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idx = 16 + (36 * qr) + (6 * qg) + qb;
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return (idx | COLOUR_FLAG_256);
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}
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/* Join RGB into a colour. */
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int
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colour_join_rgb(u_char r, u_char g, u_char b)
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{
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return ((((int)((r) & 0xff)) << 16) |
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(((int)((g) & 0xff)) << 8) |
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(((int)((b) & 0xff))) | COLOUR_FLAG_RGB);
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}
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/* Split colour into RGB. */
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void
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colour_split_rgb(int c, u_char *r, u_char *g, u_char *b)
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{
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*r = (c >> 16) & 0xff;
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*g = (c >> 8) & 0xff;
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*b = c & 0xff;
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}
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/* Convert colour to a string. */
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const char *
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colour_tostring(int c)
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{
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static char s[32];
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u_char r, g, b;
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if (c & COLOUR_FLAG_RGB) {
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colour_split_rgb(c, &r, &g, &b);
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xsnprintf(s, sizeof s, "#%02x%02x%02x", r, g, b);
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return (s);
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}
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if (c & COLOUR_FLAG_256) {
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xsnprintf(s, sizeof s, "colour%u", c & 0xff);
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return (s);
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}
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switch (c) {
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case 0:
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return ("black");
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case 1:
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return ("red");
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case 2:
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return ("green");
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case 3:
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return ("yellow");
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case 4:
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return ("blue");
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case 5:
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return ("magenta");
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case 6:
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return ("cyan");
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case 7:
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return ("white");
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case 8:
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return ("default");
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case 90:
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return ("brightblack");
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case 91:
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return ("brightred");
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case 92:
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return ("brightgreen");
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case 93:
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return ("brightyellow");
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case 94:
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return ("brightblue");
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case 95:
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return ("brightmagenta");
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case 96:
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return ("brightcyan");
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case 97:
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return ("brightwhite");
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}
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return (NULL);
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}
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/* Convert colour from string. */
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int
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colour_fromstring(const char *s)
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{
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const char *errstr;
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const char *cp;
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int n;
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u_char r, g, b;
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if (*s == '#' && strlen(s) == 7) {
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for (cp = s + 1; isxdigit((u_char) *cp); cp++)
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;
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if (*cp != '\0')
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return (-1);
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n = sscanf(s + 1, "%2hhx%2hhx%2hhx", &r, &g, &b);
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if (n != 3)
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return (-1);
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return (colour_join_rgb(r, g, b));
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}
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if (strncasecmp(s, "colour", (sizeof "colour") - 1) == 0) {
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n = strtonum(s + (sizeof "colour") - 1, 0, 255, &errstr);
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if (errstr != NULL)
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return (-1);
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return (n | COLOUR_FLAG_256);
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}
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if (strcasecmp(s, "black") == 0 || strcmp(s, "0") == 0)
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return (0);
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if (strcasecmp(s, "red") == 0 || strcmp(s, "1") == 0)
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return (1);
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if (strcasecmp(s, "green") == 0 || strcmp(s, "2") == 0)
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return (2);
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if (strcasecmp(s, "yellow") == 0 || strcmp(s, "3") == 0)
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return (3);
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if (strcasecmp(s, "blue") == 0 || strcmp(s, "4") == 0)
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return (4);
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if (strcasecmp(s, "magenta") == 0 || strcmp(s, "5") == 0)
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return (5);
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if (strcasecmp(s, "cyan") == 0 || strcmp(s, "6") == 0)
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return (6);
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if (strcasecmp(s, "white") == 0 || strcmp(s, "7") == 0)
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return (7);
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if (strcasecmp(s, "default") == 0 || strcmp(s, "8") == 0)
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return (8);
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if (strcasecmp(s, "brightblack") == 0 || strcmp(s, "90") == 0)
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return (90);
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if (strcasecmp(s, "brightred") == 0 || strcmp(s, "91") == 0)
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return (91);
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if (strcasecmp(s, "brightgreen") == 0 || strcmp(s, "92") == 0)
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return (92);
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if (strcasecmp(s, "brightyellow") == 0 || strcmp(s, "93") == 0)
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return (93);
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if (strcasecmp(s, "brightblue") == 0 || strcmp(s, "94") == 0)
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return (94);
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if (strcasecmp(s, "brightmagenta") == 0 || strcmp(s, "95") == 0)
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return (95);
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if (strcasecmp(s, "brightcyan") == 0 || strcmp(s, "96") == 0)
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return (96);
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if (strcasecmp(s, "brightwhite") == 0 || strcmp(s, "97") == 0)
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return (97);
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return (-1);
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}
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/* Convert 256 colour palette to 16. */
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u_char
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colour_256to16(u_char c)
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{
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static const u_char table[256] = {
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
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0, 4, 4, 4, 12, 12, 2, 6, 4, 4, 12, 12, 2, 2, 6, 4,
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12, 12, 2, 2, 2, 6, 12, 12, 10, 10, 10, 10, 14, 12, 10, 10,
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10, 10, 10, 14, 1, 5, 4, 4, 12, 12, 3, 8, 4, 4, 12, 12,
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2, 2, 6, 4, 12, 12, 2, 2, 2, 6, 12, 12, 10, 10, 10, 10,
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14, 12, 10, 10, 10, 10, 10, 14, 1, 1, 5, 4, 12, 12, 1, 1,
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5, 4, 12, 12, 3, 3, 8, 4, 12, 12, 2, 2, 2, 6, 12, 12,
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10, 10, 10, 10, 14, 12, 10, 10, 10, 10, 10, 14, 1, 1, 1, 5,
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12, 12, 1, 1, 1, 5, 12, 12, 1, 1, 1, 5, 12, 12, 3, 3,
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3, 7, 12, 12, 10, 10, 10, 10, 14, 12, 10, 10, 10, 10, 10, 14,
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9, 9, 9, 9, 13, 12, 9, 9, 9, 9, 13, 12, 9, 9, 9, 9,
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13, 12, 9, 9, 9, 9, 13, 12, 11, 11, 11, 11, 7, 12, 10, 10,
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10, 10, 10, 14, 9, 9, 9, 9, 9, 13, 9, 9, 9, 9, 9, 13,
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9, 9, 9, 9, 9, 13, 9, 9, 9, 9, 9, 13, 9, 9, 9, 9,
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9, 13, 11, 11, 11, 11, 11, 15, 0, 0, 0, 0, 0, 0, 8, 8,
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8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 15, 15, 15, 15, 15, 15
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};
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return (table[c]);
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}
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