Annotation of embedaddon/tmux/colour.c, revision 1.1
1.1 ! misho 1: /* $OpenBSD$ */
! 2:
! 3: /*
! 4: * Copyright (c) 2008 Nicholas Marriott <nicholas.marriott@gmail.com>
! 5: * Copyright (c) 2016 Avi Halachmi <avihpit@yahoo.com>
! 6: *
! 7: * Permission to use, copy, modify, and distribute this software for any
! 8: * purpose with or without fee is hereby granted, provided that the above
! 9: * copyright notice and this permission notice appear in all copies.
! 10: *
! 11: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
! 12: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
! 13: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
! 14: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
! 15: * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
! 16: * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
! 17: * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
! 18: */
! 19:
! 20: #include <sys/types.h>
! 21:
! 22: #include <ctype.h>
! 23: #include <stdlib.h>
! 24: #include <string.h>
! 25:
! 26: #include "tmux.h"
! 27:
! 28: static int
! 29: colour_dist_sq(int R, int G, int B, int r, int g, int b)
! 30: {
! 31: return ((R - r) * (R - r) + (G - g) * (G - g) + (B - b) * (B - b));
! 32: }
! 33:
! 34: static int
! 35: colour_to_6cube(int v)
! 36: {
! 37: if (v < 48)
! 38: return (0);
! 39: if (v < 114)
! 40: return (1);
! 41: return ((v - 35) / 40);
! 42: }
! 43:
! 44: /*
! 45: * Convert an RGB triplet to the xterm(1) 256 colour palette.
! 46: *
! 47: * xterm provides a 6x6x6 colour cube (16 - 231) and 24 greys (232 - 255). We
! 48: * map our RGB colour to the closest in the cube, also work out the closest
! 49: * grey, and use the nearest of the two.
! 50: *
! 51: * Note that the xterm has much lower resolution for darker colours (they are
! 52: * not evenly spread out), so our 6 levels are not evenly spread: 0x0, 0x5f
! 53: * (95), 0x87 (135), 0xaf (175), 0xd7 (215) and 0xff (255). Greys are more
! 54: * evenly spread (8, 18, 28 ... 238).
! 55: */
! 56: int
! 57: colour_find_rgb(u_char r, u_char g, u_char b)
! 58: {
! 59: static const int q2c[6] = { 0x00, 0x5f, 0x87, 0xaf, 0xd7, 0xff };
! 60: int qr, qg, qb, cr, cg, cb, d, idx;
! 61: int grey_avg, grey_idx, grey;
! 62:
! 63: /* Map RGB to 6x6x6 cube. */
! 64: qr = colour_to_6cube(r); cr = q2c[qr];
! 65: qg = colour_to_6cube(g); cg = q2c[qg];
! 66: qb = colour_to_6cube(b); cb = q2c[qb];
! 67:
! 68: /* If we have hit the colour exactly, return early. */
! 69: if (cr == r && cg == g && cb == b)
! 70: return ((16 + (36 * qr) + (6 * qg) + qb) | COLOUR_FLAG_256);
! 71:
! 72: /* Work out the closest grey (average of RGB). */
! 73: grey_avg = (r + g + b) / 3;
! 74: if (grey_avg > 238)
! 75: grey_idx = 23;
! 76: else
! 77: grey_idx = (grey_avg - 3) / 10;
! 78: grey = 8 + (10 * grey_idx);
! 79:
! 80: /* Is grey or 6x6x6 colour closest? */
! 81: d = colour_dist_sq(cr, cg, cb, r, g, b);
! 82: if (colour_dist_sq(grey, grey, grey, r, g, b) < d)
! 83: idx = 232 + grey_idx;
! 84: else
! 85: idx = 16 + (36 * qr) + (6 * qg) + qb;
! 86: return (idx | COLOUR_FLAG_256);
! 87: }
! 88:
! 89: /* Join RGB into a colour. */
! 90: int
! 91: colour_join_rgb(u_char r, u_char g, u_char b)
! 92: {
! 93: return ((((int)((r) & 0xff)) << 16) |
! 94: (((int)((g) & 0xff)) << 8) |
! 95: (((int)((b) & 0xff))) | COLOUR_FLAG_RGB);
! 96: }
! 97:
! 98: /* Split colour into RGB. */
! 99: void
! 100: colour_split_rgb(int c, u_char *r, u_char *g, u_char *b)
! 101: {
! 102: *r = (c >> 16) & 0xff;
! 103: *g = (c >> 8) & 0xff;
! 104: *b = c & 0xff;
! 105: }
! 106:
! 107: /* Convert colour to a string. */
! 108: const char *
! 109: colour_tostring(int c)
! 110: {
! 111: static char s[32];
! 112: u_char r, g, b;
! 113:
! 114: if (c & COLOUR_FLAG_RGB) {
! 115: colour_split_rgb(c, &r, &g, &b);
! 116: xsnprintf(s, sizeof s, "#%02x%02x%02x", r, g, b);
! 117: return (s);
! 118: }
! 119:
! 120: if (c & COLOUR_FLAG_256) {
! 121: xsnprintf(s, sizeof s, "colour%u", c & 0xff);
! 122: return (s);
! 123: }
! 124:
! 125: switch (c) {
! 126: case 0:
! 127: return ("black");
! 128: case 1:
! 129: return ("red");
! 130: case 2:
! 131: return ("green");
! 132: case 3:
! 133: return ("yellow");
! 134: case 4:
! 135: return ("blue");
! 136: case 5:
! 137: return ("magenta");
! 138: case 6:
! 139: return ("cyan");
! 140: case 7:
! 141: return ("white");
! 142: case 8:
! 143: return ("default");
! 144: case 90:
! 145: return ("brightblack");
! 146: case 91:
! 147: return ("brightred");
! 148: case 92:
! 149: return ("brightgreen");
! 150: case 93:
! 151: return ("brightyellow");
! 152: case 94:
! 153: return ("brightblue");
! 154: case 95:
! 155: return ("brightmagenta");
! 156: case 96:
! 157: return ("brightcyan");
! 158: case 97:
! 159: return ("brightwhite");
! 160: }
! 161: return (NULL);
! 162: }
! 163:
! 164: /* Convert colour from string. */
! 165: int
! 166: colour_fromstring(const char *s)
! 167: {
! 168: const char *errstr;
! 169: const char *cp;
! 170: int n;
! 171: u_char r, g, b;
! 172:
! 173: if (*s == '#' && strlen(s) == 7) {
! 174: for (cp = s + 1; isxdigit((u_char) *cp); cp++)
! 175: ;
! 176: if (*cp != '\0')
! 177: return (-1);
! 178: n = sscanf(s + 1, "%2hhx%2hhx%2hhx", &r, &g, &b);
! 179: if (n != 3)
! 180: return (-1);
! 181: return (colour_join_rgb(r, g, b));
! 182: }
! 183:
! 184: if (strncasecmp(s, "colour", (sizeof "colour") - 1) == 0) {
! 185: n = strtonum(s + (sizeof "colour") - 1, 0, 255, &errstr);
! 186: if (errstr != NULL)
! 187: return (-1);
! 188: return (n | COLOUR_FLAG_256);
! 189: }
! 190:
! 191: if (strcasecmp(s, "black") == 0 || strcmp(s, "0") == 0)
! 192: return (0);
! 193: if (strcasecmp(s, "red") == 0 || strcmp(s, "1") == 0)
! 194: return (1);
! 195: if (strcasecmp(s, "green") == 0 || strcmp(s, "2") == 0)
! 196: return (2);
! 197: if (strcasecmp(s, "yellow") == 0 || strcmp(s, "3") == 0)
! 198: return (3);
! 199: if (strcasecmp(s, "blue") == 0 || strcmp(s, "4") == 0)
! 200: return (4);
! 201: if (strcasecmp(s, "magenta") == 0 || strcmp(s, "5") == 0)
! 202: return (5);
! 203: if (strcasecmp(s, "cyan") == 0 || strcmp(s, "6") == 0)
! 204: return (6);
! 205: if (strcasecmp(s, "white") == 0 || strcmp(s, "7") == 0)
! 206: return (7);
! 207: if (strcasecmp(s, "default") == 0 || strcmp(s, "8") == 0)
! 208: return (8);
! 209: if (strcasecmp(s, "brightblack") == 0 || strcmp(s, "90") == 0)
! 210: return (90);
! 211: if (strcasecmp(s, "brightred") == 0 || strcmp(s, "91") == 0)
! 212: return (91);
! 213: if (strcasecmp(s, "brightgreen") == 0 || strcmp(s, "92") == 0)
! 214: return (92);
! 215: if (strcasecmp(s, "brightyellow") == 0 || strcmp(s, "93") == 0)
! 216: return (93);
! 217: if (strcasecmp(s, "brightblue") == 0 || strcmp(s, "94") == 0)
! 218: return (94);
! 219: if (strcasecmp(s, "brightmagenta") == 0 || strcmp(s, "95") == 0)
! 220: return (95);
! 221: if (strcasecmp(s, "brightcyan") == 0 || strcmp(s, "96") == 0)
! 222: return (96);
! 223: if (strcasecmp(s, "brightwhite") == 0 || strcmp(s, "97") == 0)
! 224: return (97);
! 225: return (-1);
! 226: }
! 227:
! 228: /* Convert 256 colour palette to 16. */
! 229: u_char
! 230: colour_256to16(u_char c)
! 231: {
! 232: static const u_char table[256] = {
! 233: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
! 234: 0, 4, 4, 4, 12, 12, 2, 6, 4, 4, 12, 12, 2, 2, 6, 4,
! 235: 12, 12, 2, 2, 2, 6, 12, 12, 10, 10, 10, 10, 14, 12, 10, 10,
! 236: 10, 10, 10, 14, 1, 5, 4, 4, 12, 12, 3, 8, 4, 4, 12, 12,
! 237: 2, 2, 6, 4, 12, 12, 2, 2, 2, 6, 12, 12, 10, 10, 10, 10,
! 238: 14, 12, 10, 10, 10, 10, 10, 14, 1, 1, 5, 4, 12, 12, 1, 1,
! 239: 5, 4, 12, 12, 3, 3, 8, 4, 12, 12, 2, 2, 2, 6, 12, 12,
! 240: 10, 10, 10, 10, 14, 12, 10, 10, 10, 10, 10, 14, 1, 1, 1, 5,
! 241: 12, 12, 1, 1, 1, 5, 12, 12, 1, 1, 1, 5, 12, 12, 3, 3,
! 242: 3, 7, 12, 12, 10, 10, 10, 10, 14, 12, 10, 10, 10, 10, 10, 14,
! 243: 9, 9, 9, 9, 13, 12, 9, 9, 9, 9, 13, 12, 9, 9, 9, 9,
! 244: 13, 12, 9, 9, 9, 9, 13, 12, 11, 11, 11, 11, 7, 12, 10, 10,
! 245: 10, 10, 10, 14, 9, 9, 9, 9, 9, 13, 9, 9, 9, 9, 9, 13,
! 246: 9, 9, 9, 9, 9, 13, 9, 9, 9, 9, 9, 13, 9, 9, 9, 9,
! 247: 9, 13, 11, 11, 11, 11, 11, 15, 0, 0, 0, 0, 0, 0, 8, 8,
! 248: 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 15, 15, 15, 15, 15, 15
! 249: };
! 250:
! 251: return (table[c]);
! 252: }
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/cvsweb/back.gif){kind=icon}
Return to colour.c CVS log ![[TXT]](/icons/cvsweb/text.gif){kind=icon}
![[DIR]](/icons/cvsweb/dir.gif){kind=icon}
Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / tmux