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/* $OpenBSD: colour.c,v 1.4 2011/08/22 10:14:15 nicm Exp $ */
/*
* Copyright (c) 2008 Nicholas Marriott <nicm@users.sourceforge.net>
*
* 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 <sys/types.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#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);
u_int 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. */
u_int
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 (r * r + g * g + b * b);
}
/* Work out the nearest colour from the 256 colour set. */
int
colour_rgb_find(struct colour_rgb *rgb)
{
u_int distance, lowest, colour, i;
if (colour_rgb_256 == NULL)
colour_rgb_generate256();
colour = 16;
lowest = UINT_MAX;
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]);
}
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