Annotation of src/usr.bin/tmux/colour.c, Revision 1.5
1.5 ! nicm 1: /* $OpenBSD: colour.c,v 1.4 2011/08/22 10:14:15 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");
1.5 ! nicm 173: case 90:
! 174: return ("brightblack");
! 175: case 91:
! 176: return ("brightred");
! 177: case 92:
! 178: return ("brightgreen");
! 179: case 93:
! 180: return ("brightyellow");
! 181: case 94:
! 182: return ("brightblue");
! 183: case 95:
! 184: return ("brightmagenta");
! 185: case 96:
! 186: return ("brightcyan");
! 187: case 97:
! 188: return ("brightwhite");
1.1 nicm 189: }
190: return (NULL);
191: }
192:
1.3 nicm 193: /* Convert colour from string. */
1.1 nicm 194: int
195: colour_fromstring(const char *s)
196: {
1.3 nicm 197: const char *errstr;
198: const char *cp;
199: struct colour_rgb rgb;
200: int n;
201:
202: if (*s == '#' && strlen(s) == 7) {
203: for (cp = s + 1; isxdigit((u_char) *cp); cp++)
204: ;
205: if (*cp != '\0')
206: return (-1);
207: n = sscanf(s + 1, "%2hhx%2hhx%2hhx", &rgb.r, &rgb.g, &rgb.b);
208: if (n != 3)
209: return (-1);
210: return (colour_rgb_find(&rgb) | 0x100);
211: }
1.2 nicm 212:
213: if (strncasecmp(s, "colour", (sizeof "colour") - 1) == 0) {
214: n = strtonum(s + (sizeof "colour") - 1, 0, 255, &errstr);
215: if (errstr != NULL)
216: return (-1);
217: return (n | 0x100);
218: }
219:
1.1 nicm 220: if (strcasecmp(s, "black") == 0 || (s[0] == '0' && s[1] == '\0'))
221: return (0);
222: if (strcasecmp(s, "red") == 0 || (s[0] == '1' && s[1] == '\0'))
223: return (1);
224: if (strcasecmp(s, "green") == 0 || (s[0] == '2' && s[1] == '\0'))
225: return (2);
226: if (strcasecmp(s, "yellow") == 0 || (s[0] == '3' && s[1] == '\0'))
227: return (3);
228: if (strcasecmp(s, "blue") == 0 || (s[0] == '4' && s[1] == '\0'))
229: return (4);
230: if (strcasecmp(s, "magenta") == 0 || (s[0] == '5' && s[1] == '\0'))
231: return (5);
232: if (strcasecmp(s, "cyan") == 0 || (s[0] == '6' && s[1] == '\0'))
233: return (6);
234: if (strcasecmp(s, "white") == 0 || (s[0] == '7' && s[1] == '\0'))
235: return (7);
236: if (strcasecmp(s, "default") == 0 || (s[0] == '8' && s[1] == '\0'))
237: return (8);
1.5 ! nicm 238: if (strcasecmp(s, "brightblack") == 0 ||
! 239: (s[0] == '9' && s[1] == '0' && s[1] == '\0'))
! 240: return (90);
! 241: if (strcasecmp(s, "brightred") == 0 ||
! 242: (s[0] == '9' && s[1] == '1' && s[1] == '\0'))
! 243: return (91);
! 244: if (strcasecmp(s, "brightgreen") == 0 ||
! 245: (s[0] == '9' && s[1] == '2' && s[1] == '\0'))
! 246: return (92);
! 247: if (strcasecmp(s, "brightyellow") == 0 ||
! 248: (s[0] == '9' && s[1] == '3' && s[1] == '\0'))
! 249: return (93);
! 250: if (strcasecmp(s, "brightblue") == 0 ||
! 251: (s[0] == '9' && s[1] == '4' && s[1] == '\0'))
! 252: return (94);
! 253: if (strcasecmp(s, "brightmagenta") == 0 ||
! 254: (s[0] == '9' && s[1] == '5' && s[1] == '\0'))
! 255: return (95);
! 256: if (strcasecmp(s, "brightcyan") == 0 ||
! 257: (s[0] == '9' && s[1] == '6' && s[1] == '\0'))
! 258: return (96);
! 259: if (strcasecmp(s, "brightwhite") == 0 ||
! 260: (s[0] == '9' && s[1] == '7' && s[1] == '\0'))
! 261: return (97);
1.1 nicm 262: return (-1);
263: }
264:
1.3 nicm 265: /* Convert 256 colour palette to 16. */
1.1 nicm 266: u_char
267: colour_256to16(u_char c)
268: {
269: static const u_char table[256] = {
270: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
271: 0, 4, 4, 4, 12, 12, 2, 6, 4, 4, 12, 12, 2, 2, 6, 4,
272: 12, 12, 2, 2, 2, 6, 12, 12, 10, 10, 10, 10, 14, 12, 10, 10,
273: 10, 10, 10, 14, 1, 5, 4, 4, 12, 12, 3, 8, 4, 4, 12, 12,
274: 2, 2, 6, 4, 12, 12, 2, 2, 2, 6, 12, 12, 10, 10, 10, 10,
275: 14, 12, 10, 10, 10, 10, 10, 14, 1, 1, 5, 4, 12, 12, 1, 1,
276: 5, 4, 12, 12, 3, 3, 8, 4, 12, 12, 2, 2, 2, 6, 12, 12,
277: 10, 10, 10, 10, 14, 12, 10, 10, 10, 10, 10, 14, 1, 1, 1, 5,
278: 12, 12, 1, 1, 1, 5, 12, 12, 1, 1, 1, 5, 12, 12, 3, 3,
279: 3, 7, 12, 12, 10, 10, 10, 10, 14, 12, 10, 10, 10, 10, 10, 14,
280: 9, 9, 9, 9, 13, 12, 9, 9, 9, 9, 13, 12, 9, 9, 9, 9,
281: 13, 12, 9, 9, 9, 9, 13, 12, 11, 11, 11, 11, 7, 12, 10, 10,
282: 10, 10, 10, 14, 9, 9, 9, 9, 9, 13, 9, 9, 9, 9, 9, 13,
283: 9, 9, 9, 9, 9, 13, 9, 9, 9, 9, 9, 13, 9, 9, 9, 9,
284: 9, 13, 11, 11, 11, 11, 11, 15, 0, 0, 0, 0, 0, 0, 8, 8,
285: 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 15, 15, 15, 15, 15, 15
286: };
287:
288: return (table[c]);
289: }
290:
1.3 nicm 291: /* Convert 256 colour palette to 88. */
1.1 nicm 292: u_char
293: colour_256to88(u_char c)
294: {
295: static const u_char table[256] = {
296: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
297: 16, 17, 17, 18, 18, 19, 20, 21, 21, 22, 22, 23, 20, 21, 21, 22,
298: 22, 23, 24, 25, 25, 26, 26, 27, 24, 25, 25, 26, 26, 27, 28, 29,
299: 29, 30, 30, 31, 32, 33, 33, 34, 34, 35, 36, 37, 37, 38, 38, 39,
300: 36, 37, 37, 38, 38, 39, 40, 41, 41, 42, 42, 43, 40, 41, 41, 42,
301: 42, 43, 44, 45, 45, 46, 46, 47, 32, 33, 33, 34, 34, 35, 36, 37,
302: 37, 38, 38, 39, 36, 37, 37, 38, 38, 39, 40, 41, 41, 42, 42, 43,
303: 40, 41, 41, 42, 42, 43, 44, 45, 45, 46, 46, 47, 48, 49, 49, 50,
304: 50, 51, 52, 53, 53, 54, 54, 55, 52, 53, 53, 54, 54, 55, 56, 57,
305: 57, 58, 58, 59, 56, 57, 57, 58, 58, 59, 60, 61, 61, 62, 62, 63,
306: 48, 49, 49, 50, 50, 51, 52, 53, 53, 54, 54, 55, 52, 53, 53, 54,
307: 54, 55, 56, 57, 57, 58, 58, 59, 56, 57, 57, 58, 58, 59, 60, 61,
308: 61, 62, 62, 63, 64, 65, 65, 66, 66, 67, 68, 69, 69, 70, 70, 71,
309: 68, 69, 69, 70, 70, 71, 72, 73, 73, 74, 74, 75, 72, 73, 73, 74,
310: 74, 75, 76, 77, 77, 78, 78, 79, 0, 0, 80, 80, 80, 81, 81, 81,
311: 82, 82, 82, 83, 83, 83, 84, 84, 84, 85, 85, 85, 86, 86, 86, 87
312: };
313:
314: return (table[c]);
315: }
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