Annotation of src/usr.bin/tmux/colour.c, Revision 1.4
1.4 ! nicm 1: /* $OpenBSD: colour.c,v 1.3 2011/01/08 00:48:54 nicm Exp $ */
1.1 nicm 2:
3: /*
4: * Copyright (c) 2008 Nicholas Marriott <nicm@users.sourceforge.net>
5: *
6: * Permission to use, copy, modify, and distribute this software for any
7: * purpose with or without fee is hereby granted, provided that the above
8: * copyright notice and this permission notice appear in all copies.
9: *
10: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14: * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
15: * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
16: * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17: */
18:
19: #include <sys/types.h>
20:
1.3 nicm 21: #include <ctype.h>
1.2 nicm 22: #include <stdlib.h>
1.1 nicm 23: #include <string.h>
24:
25: #include "tmux.h"
26:
1.2 nicm 27: /*
28: * Colour to string conversion functions. Bit 8 of the colour means it is one
29: * of the 256 colour palette.
30: */
31:
1.3 nicm 32: /* An RGB colour. */
33: struct colour_rgb {
34: u_char r;
35: u_char g;
36: u_char b;
37: };
38:
39: /* 256 colour RGB table, generated on first use. */
40: struct colour_rgb *colour_rgb_256;
41:
42: void colour_rgb_generate256(void);
1.4 ! nicm 43: u_int colour_rgb_distance(struct colour_rgb *, struct colour_rgb *);
1.3 nicm 44: int colour_rgb_find(struct colour_rgb *);
45:
46: /* Generate 256 colour RGB table. */
47: void
48: colour_rgb_generate256(void)
49: {
50: struct colour_rgb *rgb;
51: u_int i, r, g, b;
52:
53: /*
54: * Allocate the table. The first 16 colours are often changed by users
55: * and terminals so don't include them.
56: */
57: colour_rgb_256 = xcalloc(240, sizeof *colour_rgb_256);
58:
59: /* Add the colours first. */
60: r = g = b = 0;
61: for (i = 240; i > 24; i--) {
62: rgb = &colour_rgb_256[240 - i];
63:
64: if (r != 0)
65: rgb->r = (r * 40) + 55;
66: if (g != 0)
67: rgb->g = (g * 40) + 55;
68: if (b != 0)
69: rgb->b = (b * 40) + 55;
70:
71: b++;
72: if (b > 5) {
73: b = 0;
74: g++;
75: }
76: if (g > 5) {
77: g = 0;
78: r++;
79: }
80: }
81:
82: /* Then add the greys. */
83: for (i = 24; i > 0; i--) {
84: rgb = &colour_rgb_256[240 - i];
85:
86: rgb->r = 8 + (24 - i) * 10;
87: rgb->g = 8 + (24 - i) * 10;
88: rgb->b = 8 + (24 - i) * 10;
89: }
90: }
91:
92: /* Get colour RGB distance. */
1.4 ! nicm 93: u_int
1.3 nicm 94: colour_rgb_distance(struct colour_rgb *rgb1, struct colour_rgb *rgb2)
95: {
96: int r, g, b;
97:
98: r = rgb1->r - rgb2->r;
99: g = rgb1->g - rgb2->g;
100: b = rgb1->b - rgb2->b;
1.4 ! nicm 101: return (r * r + g * g + b * b);
1.3 nicm 102: }
103:
104: /* Work out the nearest colour from the 256 colour set. */
105: int
106: colour_rgb_find(struct colour_rgb *rgb)
107: {
1.4 ! nicm 108: u_int distance, lowest, colour, i;
1.3 nicm 109:
110: if (colour_rgb_256 == NULL)
111: colour_rgb_generate256();
112:
113: colour = 16;
1.4 ! nicm 114: lowest = UINT_MAX;
1.3 nicm 115: for (i = 0; i < 240; i++) {
116: distance = colour_rgb_distance(&colour_rgb_256[i], rgb);
117: if (distance < lowest) {
118: lowest = distance;
119: colour = 16 + i;
120: }
121: }
122: return (colour);
123: }
124:
125: /* Set grid cell foreground colour. */
1.2 nicm 126: void
127: colour_set_fg(struct grid_cell *gc, int c)
128: {
129: if (c & 0x100)
130: gc->flags |= GRID_FLAG_FG256;
131: gc->fg = c;
132: }
133:
1.3 nicm 134: /* Set grid cell background colour. */
1.2 nicm 135: void
136: colour_set_bg(struct grid_cell *gc, int c)
137: {
138: if (c & 0x100)
139: gc->flags |= GRID_FLAG_BG256;
140: gc->bg = c;
141: }
142:
1.3 nicm 143: /* Convert colour to a string. */
1.1 nicm 144: const char *
1.2 nicm 145: colour_tostring(int c)
1.1 nicm 146: {
1.2 nicm 147: static char s[32];
148:
149: if (c & 0x100) {
150: xsnprintf(s, sizeof s, "colour%u", c & ~0x100);
151: return (s);
152: }
153:
1.1 nicm 154: switch (c) {
155: case 0:
156: return ("black");
157: case 1:
158: return ("red");
159: case 2:
160: return ("green");
161: case 3:
162: return ("yellow");
163: case 4:
164: return ("blue");
165: case 5:
166: return ("magenta");
167: case 6:
168: return ("cyan");
169: case 7:
170: return ("white");
171: case 8:
172: return ("default");
173: }
174: return (NULL);
175: }
176:
1.3 nicm 177: /* Convert colour from string. */
1.1 nicm 178: int
179: colour_fromstring(const char *s)
180: {
1.3 nicm 181: const char *errstr;
182: const char *cp;
183: struct colour_rgb rgb;
184: int n;
185:
186: if (*s == '#' && strlen(s) == 7) {
187: for (cp = s + 1; isxdigit((u_char) *cp); cp++)
188: ;
189: if (*cp != '\0')
190: return (-1);
191: n = sscanf(s + 1, "%2hhx%2hhx%2hhx", &rgb.r, &rgb.g, &rgb.b);
192: if (n != 3)
193: return (-1);
194: return (colour_rgb_find(&rgb) | 0x100);
195: }
1.2 nicm 196:
197: if (strncasecmp(s, "colour", (sizeof "colour") - 1) == 0) {
198: n = strtonum(s + (sizeof "colour") - 1, 0, 255, &errstr);
199: if (errstr != NULL)
200: return (-1);
201: return (n | 0x100);
202: }
203:
1.1 nicm 204: if (strcasecmp(s, "black") == 0 || (s[0] == '0' && s[1] == '\0'))
205: return (0);
206: if (strcasecmp(s, "red") == 0 || (s[0] == '1' && s[1] == '\0'))
207: return (1);
208: if (strcasecmp(s, "green") == 0 || (s[0] == '2' && s[1] == '\0'))
209: return (2);
210: if (strcasecmp(s, "yellow") == 0 || (s[0] == '3' && s[1] == '\0'))
211: return (3);
212: if (strcasecmp(s, "blue") == 0 || (s[0] == '4' && s[1] == '\0'))
213: return (4);
214: if (strcasecmp(s, "magenta") == 0 || (s[0] == '5' && s[1] == '\0'))
215: return (5);
216: if (strcasecmp(s, "cyan") == 0 || (s[0] == '6' && s[1] == '\0'))
217: return (6);
218: if (strcasecmp(s, "white") == 0 || (s[0] == '7' && s[1] == '\0'))
219: return (7);
220: if (strcasecmp(s, "default") == 0 || (s[0] == '8' && s[1] == '\0'))
221: return (8);
222: return (-1);
223: }
224:
1.3 nicm 225: /* Convert 256 colour palette to 16. */
1.1 nicm 226: u_char
227: colour_256to16(u_char c)
228: {
229: static const u_char table[256] = {
230: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
231: 0, 4, 4, 4, 12, 12, 2, 6, 4, 4, 12, 12, 2, 2, 6, 4,
232: 12, 12, 2, 2, 2, 6, 12, 12, 10, 10, 10, 10, 14, 12, 10, 10,
233: 10, 10, 10, 14, 1, 5, 4, 4, 12, 12, 3, 8, 4, 4, 12, 12,
234: 2, 2, 6, 4, 12, 12, 2, 2, 2, 6, 12, 12, 10, 10, 10, 10,
235: 14, 12, 10, 10, 10, 10, 10, 14, 1, 1, 5, 4, 12, 12, 1, 1,
236: 5, 4, 12, 12, 3, 3, 8, 4, 12, 12, 2, 2, 2, 6, 12, 12,
237: 10, 10, 10, 10, 14, 12, 10, 10, 10, 10, 10, 14, 1, 1, 1, 5,
238: 12, 12, 1, 1, 1, 5, 12, 12, 1, 1, 1, 5, 12, 12, 3, 3,
239: 3, 7, 12, 12, 10, 10, 10, 10, 14, 12, 10, 10, 10, 10, 10, 14,
240: 9, 9, 9, 9, 13, 12, 9, 9, 9, 9, 13, 12, 9, 9, 9, 9,
241: 13, 12, 9, 9, 9, 9, 13, 12, 11, 11, 11, 11, 7, 12, 10, 10,
242: 10, 10, 10, 14, 9, 9, 9, 9, 9, 13, 9, 9, 9, 9, 9, 13,
243: 9, 9, 9, 9, 9, 13, 9, 9, 9, 9, 9, 13, 9, 9, 9, 9,
244: 9, 13, 11, 11, 11, 11, 11, 15, 0, 0, 0, 0, 0, 0, 8, 8,
245: 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 15, 15, 15, 15, 15, 15
246: };
247:
248: return (table[c]);
249: }
250:
1.3 nicm 251: /* Convert 256 colour palette to 88. */
1.1 nicm 252: u_char
253: colour_256to88(u_char c)
254: {
255: static const u_char table[256] = {
256: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
257: 16, 17, 17, 18, 18, 19, 20, 21, 21, 22, 22, 23, 20, 21, 21, 22,
258: 22, 23, 24, 25, 25, 26, 26, 27, 24, 25, 25, 26, 26, 27, 28, 29,
259: 29, 30, 30, 31, 32, 33, 33, 34, 34, 35, 36, 37, 37, 38, 38, 39,
260: 36, 37, 37, 38, 38, 39, 40, 41, 41, 42, 42, 43, 40, 41, 41, 42,
261: 42, 43, 44, 45, 45, 46, 46, 47, 32, 33, 33, 34, 34, 35, 36, 37,
262: 37, 38, 38, 39, 36, 37, 37, 38, 38, 39, 40, 41, 41, 42, 42, 43,
263: 40, 41, 41, 42, 42, 43, 44, 45, 45, 46, 46, 47, 48, 49, 49, 50,
264: 50, 51, 52, 53, 53, 54, 54, 55, 52, 53, 53, 54, 54, 55, 56, 57,
265: 57, 58, 58, 59, 56, 57, 57, 58, 58, 59, 60, 61, 61, 62, 62, 63,
266: 48, 49, 49, 50, 50, 51, 52, 53, 53, 54, 54, 55, 52, 53, 53, 54,
267: 54, 55, 56, 57, 57, 58, 58, 59, 56, 57, 57, 58, 58, 59, 60, 61,
268: 61, 62, 62, 63, 64, 65, 65, 66, 66, 67, 68, 69, 69, 70, 70, 71,
269: 68, 69, 69, 70, 70, 71, 72, 73, 73, 74, 74, 75, 72, 73, 73, 74,
270: 74, 75, 76, 77, 77, 78, 78, 79, 0, 0, 80, 80, 80, 81, 81, 81,
271: 82, 82, 82, 83, 83, 83, 84, 84, 84, 85, 85, 85, 86, 86, 86, 87
272: };
273:
274: return (table[c]);
275: }
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