colour.c - tmux - Rivoreo Source Code Repositories

 /* $OpenBSD$ */

 /*
  * 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 <math.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);
 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]);
 }
	/* $OpenBSD$ */

	/*
	* 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 <math.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);
	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]);
	}