/* $OpenBSD: colour.c,v 1.3 2011/01/08 00:48:54 nicm Exp $ */ /* * Copyright (c) 2008 Nicholas Marriott * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include #include #include #include #include #include "tmux.h" /* * Colour to string conversion functions. Bit 8 of the colour means it is one * of the 256 colour palette. */ /* An RGB colour. */ struct colour_rgb { u_char r; u_char g; u_char b; }; /* 256 colour RGB table, generated on first use. */ struct colour_rgb *colour_rgb_256; void colour_rgb_generate256(void); double colour_rgb_distance(struct colour_rgb *, struct colour_rgb *); int colour_rgb_find(struct colour_rgb *); /* Generate 256 colour RGB table. */ void colour_rgb_generate256(void) { struct colour_rgb *rgb; u_int i, r, g, b; /* * Allocate the table. The first 16 colours are often changed by users * and terminals so don't include them. */ colour_rgb_256 = xcalloc(240, sizeof *colour_rgb_256); /* Add the colours first. */ r = g = b = 0; for (i = 240; i > 24; i--) { rgb = &colour_rgb_256[240 - i]; if (r != 0) rgb->r = (r * 40) + 55; if (g != 0) rgb->g = (g * 40) + 55; if (b != 0) rgb->b = (b * 40) + 55; b++; if (b > 5) { b = 0; g++; } if (g > 5) { g = 0; r++; } } /* Then add the greys. */ for (i = 24; i > 0; i--) { rgb = &colour_rgb_256[240 - i]; rgb->r = 8 + (24 - i) * 10; rgb->g = 8 + (24 - i) * 10; rgb->b = 8 + (24 - i) * 10; } } /* Get colour RGB distance. */ double colour_rgb_distance(struct colour_rgb *rgb1, struct colour_rgb *rgb2) { int r, g, b; r = rgb1->r - rgb2->r; g = rgb1->g - rgb2->g; b = rgb1->b - rgb2->b; return (sqrt(r * r + g * g + b * b)); } /* Work out the nearest colour from the 256 colour set. */ int colour_rgb_find(struct colour_rgb *rgb) { double distance, lowest; u_int colour, i; if (colour_rgb_256 == NULL) colour_rgb_generate256(); colour = 16; lowest = INFINITY; for (i = 0; i < 240; i++) { distance = colour_rgb_distance(&colour_rgb_256[i], rgb); if (distance < lowest) { lowest = distance; colour = 16 + i; } } return (colour); } /* Set grid cell foreground colour. */ void colour_set_fg(struct grid_cell *gc, int c) { if (c & 0x100) gc->flags |= GRID_FLAG_FG256; gc->fg = c; } /* Set grid cell background colour. */ void colour_set_bg(struct grid_cell *gc, int c) { if (c & 0x100) gc->flags |= GRID_FLAG_BG256; gc->bg = c; } /* Convert colour to a string. */ const char * colour_tostring(int c) { static char s[32]; if (c & 0x100) { xsnprintf(s, sizeof s, "colour%u", c & ~0x100); return (s); } switch (c) { case 0: return ("black"); case 1: return ("red"); case 2: return ("green"); case 3: return ("yellow"); case 4: return ("blue"); case 5: return ("magenta"); case 6: return ("cyan"); case 7: return ("white"); case 8: return ("default"); } return (NULL); } /* Convert colour from string. */ int colour_fromstring(const char *s) { const char *errstr; const char *cp; struct colour_rgb rgb; int n; if (*s == '#' && strlen(s) == 7) { for (cp = s + 1; isxdigit((u_char) *cp); cp++) ; if (*cp != '\0') return (-1); n = sscanf(s + 1, "%2hhx%2hhx%2hhx", &rgb.r, &rgb.g, &rgb.b); if (n != 3) return (-1); return (colour_rgb_find(&rgb) | 0x100); } if (strncasecmp(s, "colour", (sizeof "colour") - 1) == 0) { n = strtonum(s + (sizeof "colour") - 1, 0, 255, &errstr); if (errstr != NULL) return (-1); return (n | 0x100); } if (strcasecmp(s, "black") == 0 || (s[0] == '0' && s[1] == '\0')) return (0); if (strcasecmp(s, "red") == 0 || (s[0] == '1' && s[1] == '\0')) return (1); if (strcasecmp(s, "green") == 0 || (s[0] == '2' && s[1] == '\0')) return (2); if (strcasecmp(s, "yellow") == 0 || (s[0] == '3' && s[1] == '\0')) return (3); if (strcasecmp(s, "blue") == 0 || (s[0] == '4' && s[1] == '\0')) return (4); if (strcasecmp(s, "magenta") == 0 || (s[0] == '5' && s[1] == '\0')) return (5); if (strcasecmp(s, "cyan") == 0 || (s[0] == '6' && s[1] == '\0')) return (6); if (strcasecmp(s, "white") == 0 || (s[0] == '7' && s[1] == '\0')) return (7); if (strcasecmp(s, "default") == 0 || (s[0] == '8' && s[1] == '\0')) return (8); return (-1); } /* Convert 256 colour palette to 16. */ u_char colour_256to16(u_char c) { static const u_char table[256] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 0, 4, 4, 4, 12, 12, 2, 6, 4, 4, 12, 12, 2, 2, 6, 4, 12, 12, 2, 2, 2, 6, 12, 12, 10, 10, 10, 10, 14, 12, 10, 10, 10, 10, 10, 14, 1, 5, 4, 4, 12, 12, 3, 8, 4, 4, 12, 12, 2, 2, 6, 4, 12, 12, 2, 2, 2, 6, 12, 12, 10, 10, 10, 10, 14, 12, 10, 10, 10, 10, 10, 14, 1, 1, 5, 4, 12, 12, 1, 1, 5, 4, 12, 12, 3, 3, 8, 4, 12, 12, 2, 2, 2, 6, 12, 12, 10, 10, 10, 10, 14, 12, 10, 10, 10, 10, 10, 14, 1, 1, 1, 5, 12, 12, 1, 1, 1, 5, 12, 12, 1, 1, 1, 5, 12, 12, 3, 3, 3, 7, 12, 12, 10, 10, 10, 10, 14, 12, 10, 10, 10, 10, 10, 14, 9, 9, 9, 9, 13, 12, 9, 9, 9, 9, 13, 12, 9, 9, 9, 9, 13, 12, 9, 9, 9, 9, 13, 12, 11, 11, 11, 11, 7, 12, 10, 10, 10, 10, 10, 14, 9, 9, 9, 9, 9, 13, 9, 9, 9, 9, 9, 13, 9, 9, 9, 9, 9, 13, 9, 9, 9, 9, 9, 13, 9, 9, 9, 9, 9, 13, 11, 11, 11, 11, 11, 15, 0, 0, 0, 0, 0, 0, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 15, 15, 15, 15, 15, 15 }; return (table[c]); } /* Convert 256 colour palette to 88. */ u_char colour_256to88(u_char c) { static const u_char table[256] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 17, 18, 18, 19, 20, 21, 21, 22, 22, 23, 20, 21, 21, 22, 22, 23, 24, 25, 25, 26, 26, 27, 24, 25, 25, 26, 26, 27, 28, 29, 29, 30, 30, 31, 32, 33, 33, 34, 34, 35, 36, 37, 37, 38, 38, 39, 36, 37, 37, 38, 38, 39, 40, 41, 41, 42, 42, 43, 40, 41, 41, 42, 42, 43, 44, 45, 45, 46, 46, 47, 32, 33, 33, 34, 34, 35, 36, 37, 37, 38, 38, 39, 36, 37, 37, 38, 38, 39, 40, 41, 41, 42, 42, 43, 40, 41, 41, 42, 42, 43, 44, 45, 45, 46, 46, 47, 48, 49, 49, 50, 50, 51, 52, 53, 53, 54, 54, 55, 52, 53, 53, 54, 54, 55, 56, 57, 57, 58, 58, 59, 56, 57, 57, 58, 58, 59, 60, 61, 61, 62, 62, 63, 48, 49, 49, 50, 50, 51, 52, 53, 53, 54, 54, 55, 52, 53, 53, 54, 54, 55, 56, 57, 57, 58, 58, 59, 56, 57, 57, 58, 58, 59, 60, 61, 61, 62, 62, 63, 64, 65, 65, 66, 66, 67, 68, 69, 69, 70, 70, 71, 68, 69, 69, 70, 70, 71, 72, 73, 73, 74, 74, 75, 72, 73, 73, 74, 74, 75, 76, 77, 77, 78, 78, 79, 0, 0, 80, 80, 80, 81, 81, 81, 82, 82, 82, 83, 83, 83, 84, 84, 84, 85, 85, 85, 86, 86, 86, 87 }; return (table[c]); }