ANSI Colours. More...

#include "config.h"
#include <stdbool.h>
#include "mutt/lib.h"
#include "gui/lib.h"
#include "ansi.h"
#include "attr.h"
#include "color.h"
#include "curses2.h"
#include "parse_ansi.h"
#include "simple2.h"

Include dependency graph for ansi.c:

Go to the source code of this file.

Functions
color_t	color_xterm256_to_24bit (const color_t color)
	Convert a xterm color to its RGB value.

static void	ansi_color_list_add (struct AttrColorList acl, struct AnsiColor ansi)
	Add an Ansi colour to the list.

int	ansi_color_parse (const char str, struct AnsiColor ansi, struct AttrColorList *acl, bool dry_run)
	Parse a string of ANSI escape sequence.

Detailed Description

ANSI Colours.

Authors

Richard Russon

Copyright: This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.

Definition in file ansi.c.

Function Documentation

◆ color_xterm256_to_24bit()

color_t color_xterm256_to_24bit ( const color_t color )

Convert a xterm color to its RGB value.

Parameters

[in] color xterm color number to be converted

Return values

num	The color's RGB value as number with value 0xRRGGBB

There are 256 xterm colors numbered 0 to 255.

Caller contract: color must be between 0 and 255.

Xterm Color Codes

Basic and Bright Colors

0-7 correspond to the 8 terminal colours
8-15 are the bright variants of 0-7


0	`#000000`	1	`#800000`	2	`#008000`	3	`#808000`	4	`#000080`	5	`#800080`	6	`#008080`	7	`#c0c0c0`
8	`#808080`	9	`#ff0000`	10	`#00ff00`	11	`#ffff00`	12	`#0000ff`	13	`#ff00ff`	14	`#00ffff`	15	`#ffffff`

Color palette


16	`#000000`	17	`#00005f`	18	`#000087`	19	`#0000af`	20	`#0000d7`	21	`#0000ff`
22	`#005f00`	23	`#005f5f`	24	`#005f87`	25	`#005faf`	26	`#005fd7`	27	`#005fff`
28	`#008700`	29	`#00875f`	30	`#008787`	31	`#0087af`	32	`#0087d7`	33	`#0087ff`
34	`#00af00`	35	`#00af5f`	36	`#00af87`	37	`#00afaf`	38	`#00afd7`	39	`#00afff`
40	`#00d700`	41	`#00d75f`	42	`#00d787`	43	`#00d7af`	44	`#00d7d7`	45	`#00d7ff`
46	`#00ff00`	47	`#00ff5f`	48	`#00ff87`	49	`#00ffaf`	50	`#00ffd7`	51	`#00ffff`
52	`#5f0000`	53	`#5f005f`	54	`#5f0087`	55	`#5f00af`	56	`#5f00d7`	57	`#5f00ff`
58	`#5f5f00`	59	`#5f5f5f`	60	`#5f5f87`	61	`#5f5faf`	62	`#5f5fd7`	63	`#5f5fff`
64	`#5f8700`	65	`#5f875f`	66	`#5f8787`	67	`#5f87af`	68	`#5f87d7`	69	`#5f87ff`
70	`#5faf00`	71	`#5faf5f`	72	`#5faf87`	73	`#5fafaf`	74	`#5fafd7`	75	`#5fafff`
76	`#5fd700`	77	`#5fd75f`	78	`#5fd787`	79	`#5fd7af`	80	`#5fd7d7`	81	`#5fd7ff`
82	`#5fff00`	83	`#5fff5f`	84	`#5fff87`	85	`#5fffaf`	86	`#5fffd7`	87	`#5fffff`
88	`#870000`	89	`#87005f`	90	`#870087`	91	`#8700af`	92	`#8700d7`	93	`#8700ff`
94	`#875f00`	95	`#875f5f`	96	`#875f87`	97	`#875faf`	98	`#875fd7`	99	`#875fff`
100	`#878700`	101	`#87875f`	102	`#878787`	103	`#8787af`	104	`#8787d7`	105	`#8787ff`
106	`#87af00`	107	`#87af5f`	108	`#87af87`	109	`#87afaf`	110	`#87afd7`	111	`#87afff`
112	`#87d700`	113	`#87d75f`	114	`#87d787`	115	`#87d7af`	116	`#87d7d7`	117	`#87d7ff`
118	`#87ff00`	119	`#87ff5f`	120	`#87ff87`	121	`#87ffaf`	122	`#87ffd7`	123	`#87ffff`
124	`#af0000`	125	`#af005f`	126	`#af0087`	127	`#af00af`	128	`#af00d7`	129	`#af00ff`
130	`#af5f00`	131	`#af5f5f`	132	`#af5f87`	133	`#af5faf`	134	`#af5fd7`	135	`#af5fff`
136	`#af8700`	137	`#af875f`	138	`#af8787`	139	`#af87af`	140	`#af87d7`	141	`#af87ff`
142	`#afaf00`	143	`#afaf5f`	144	`#afaf87`	145	`#afafaf`	146	`#afafd7`	147	`#afafff`
148	`#afd700`	149	`#afd75f`	150	`#afd787`	151	`#afd7af`	152	`#afd7d7`	153	`#afd7ff`
154	`#afff00`	155	`#afff5f`	156	`#afff87`	157	`#afffaf`	158	`#afffd7`	159	`#afffff`
160	`#d70000`	161	`#d7005f`	162	`#d70087`	163	`#d700af`	164	`#d700d7`	165	`#d700ff`
166	`#d75f00`	167	`#d75f5f`	168	`#d75f87`	169	`#d75faf`	170	`#d75fd7`	171	`#d75fff`
172	`#d78700`	173	`#d7875f`	174	`#d78787`	175	`#d787af`	176	`#d787d7`	177	`#d787ff`
178	`#d7af00`	179	`#d7af5f`	180	`#d7af87`	181	`#d7afaf`	182	`#d7afd7`	183	`#d7afff`
184	`#d7d700`	185	`#d7d75f`	186	`#d7d787`	187	`#d7d7af`	188	`#d7d7d7`	189	`#d7d7ff`
190	`#d7ff00`	191	`#d7ff5f`	192	`#d7ff87`	193	`#d7ffaf`	194	`#d7ffd7`	195	`#d7ffff`
196	`#ff0000`	197	`#ff005f`	198	`#ff0087`	199	`#ff00af`	200	`#ff00d7`	201	`#ff00ff`
202	`#ff5f00`	203	`#ff5f5f`	204	`#ff5f87`	205	`#ff5faf`	206	`#ff5fd7`	207	`#ff5fff`
208	`#ff8700`	209	`#ff875f`	210	`#ff8787`	211	`#ff87af`	212	`#ff87d7`	213	`#ff87ff`
214	`#ffaf00`	215	`#ffaf5f`	216	`#ffaf87`	217	`#ffafaf`	218	`#ffafd7`	219	`#ffafff`
220	`#ffd700`	221	`#ffd75f`	222	`#ffd787`	223	`#ffd7af`	224	`#ffd7d7`	225	`#ffd7ff`
226	`#ffff00`	227	`#ffff5f`	228	`#ffff87`	229	`#ffffaf`	230	`#ffffd7`	231	`#ffffff`

Grey Scale Ramp


232	`#080808`	233	`#121212`	234	`#1c1c1c`	235	`#262626`	236	`#303030`	237	`#3a3a3a`	238	`#444444`	239	`#4e4e4e`
240	`#585858`	241	`#626262`	242	`#6c6c6c`	243	`#767676`	244	`#808080`	245	`#8a8a8a`	246	`#949494`	247	`#9e9e9e`
248	`#a8a8a8`	249	`#b2b2b2`	250	`#bcbcbc`	251	`#c6c6c6`	252	`#d0d0d0`	253	`#dadada`	254	`#e4e4e4`	255	`#eeeeee`

Definition at line 320 of file attr.c.

{
  static const color_t basic[] = {
    0x000000, 0x800000, 0x008000, 0x808000, 0x000080, 0x800080,
    0x008080, 0xc0c0c0, 0x808080, 0xff0000, 0x00ff00, 0xffff00,
    0x0000ff, 0xff00ff, 0x00ffff, 0xffffff,
  };
 
  ASSERT(color < 256);
 
  if (color < 0)
    return color;
 
  const bool c_color_directcolor = cs_subset_bool(NeoMutt->sub, "color_directcolor");
  if (!c_color_directcolor)
  {
    return color;
  }
 
  if (color < 16)
  {
    color_debug(LL_DEBUG5, "Converted color 0-15: %d\n", color);
    /* The first 16 colours are the "usual" terminal colours */
    return basic[color];
  }
 
  if (color < 232)
  {
    /* The Color palette is divided in 6x6x6 colours, i.e. each R, G, B channel
     * has six values:
     *
     *  value: 1     2     3     4     5     6
     *  color: 0x00  0x5f  0x87  0xaf  0xd7  0xff
     *
     * The steps between the values is 0x28 = 40, the EXCEPT for the first one
     * where it is 0x5f = 95.
     *
     * If we express the xterm color number minus 16 to base 6, i.e.
     *
     *    color - 16 = (vr * 36) + (vg * 6) + (vb * 1)
     *
     * with vr, vg, vb integers between 0 and 5, then vr, vg, vb is the channel
     * value for red, green, and blue, respectively.
     */
 
    color_t normalised_color = color - 16;
    color_t vr = (normalised_color % 216) / 36; /* 216 = 6*6*6 */
    color_t vg = (normalised_color % 36) / 6;
    color_t vb = (normalised_color % 6) / 1;
 
    /* First step is wider than the other ones, so add the difference if needed */
    color_t r = (vr * 0x28) + ((vr > 0) ? (0x5f - 0x28) : 0);
    color_t g = (vg * 0x28) + ((vg > 0) ? (0x5f - 0x28) : 0);
    color_t b = (vb * 0x28) + ((vb > 0) ? (0x5f - 0x28) : 0);
 
    color_t rgb = (r << 16) + (g << 8) + (b << 0);
    color_debug(LL_DEBUG5, "Converted xterm color %d to RGB #%x:\n", color, rgb);
    return rgb;
  }
 
  /* Grey scale starts at 0x08 and adds 0xa = 10 in very step ending in 0xee.
   * There are a total of 6*4 = 24 grey colors in total. */
  color_t steps = color - 232;
  color_t grey = (steps * 0x0a) + 0x08;
  color_t rgb = (grey << 16) + (grey << 8) + (grey << 0);
  color_debug(LL_DEBUG5, "Converted xterm color %d to RGB #%x:\n", color, rgb);
  return rgb;
}

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◆ ansi_color_list_add()

static void ansi_color_list_add	(	struct AttrColorList *	acl,
		struct AnsiColor *	ansi
	)

static

Add an Ansi colour to the list.

Parameters

acl	List of unique colours
ansi	Colour to add

Keep track of all the unique ANSI colours in a list.

Definition at line 49 of file ansi.c.

{
  if (!acl || !ansi)
    return;
 
  if ((ansi->fg.color == COLOR_DEFAULT) && (ansi->bg.color == COLOR_DEFAULT))
  {
    switch (ansi->attrs)
    {
      case A_NORMAL:
        return;
      case A_BOLD:
        ansi->attr_color = simple_color_get(MT_COLOR_BOLD);
        return;
#ifdef A_ITALIC_DEFINED
      case A_ITALIC:
        ansi->attr_color = simple_color_get(MT_COLOR_ITALIC);
        return;
#endif
      case A_UNDERLINE:
        ansi->attr_color = simple_color_get(MT_COLOR_UNDERLINE);
        return;
    }
  }
 
  color_t fg = ansi->fg.color;
  color_t bg = ansi->bg.color;
 
#ifdef NEOMUTT_DIRECT_COLORS
  if ((ansi->fg.type == CT_SIMPLE) || (ansi->fg.type == CT_PALETTE))
    fg = color_xterm256_to_24bit(fg);
  else if (fg < 8)
    fg = 8;
  if ((ansi->bg.type == CT_SIMPLE) || (ansi->bg.type == CT_PALETTE))
    bg = color_xterm256_to_24bit(bg);
  else if (bg < 8)
    bg = 8;
#endif
 
  struct AttrColor *ac = attr_color_list_find(acl, fg, bg, ansi->attrs);
  if (ac)
  {
    ansi->attr_color = ac;
    return;
  }
 
  ac = attr_color_new();
  ac->attrs = ansi->attrs;
  ac->fg = ansi->fg;
  ac->bg = ansi->bg;
 
  struct CursesColor *cc = curses_color_new(fg, bg);
  ac->curses_color = cc;
  ansi->attr_color = ac;
 
  TAILQ_INSERT_TAIL(acl, ac, entries);
}

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◆ ansi_color_parse()

int ansi_color_parse	(	const char *	str,
		struct AnsiColor *	ansi,
		struct AttrColorList *	acl,
		bool	dry_run
	)

Parse a string of ANSI escape sequence.

Parameters

str	String to parse
ansi	AnsiColor for the result
acl	List to store the unique colours
dry_run	If true, parse but don't save the sequence

Return values

num	Total length of the escape sequences

Parse (multiple) ANSI sequence(s) into ansi. If the colour hasn't been seen before, store the it in acl.

Definition at line 118 of file ansi.c.

{
  int seq_len = 0;
  int total_len = 0;
 
  while ((seq_len = ansi_color_parse_single(str + total_len, ansi, dry_run)) != 0)
  {
    total_len += seq_len;
  }
 
  ansi_color_list_add(acl, ansi);
 
  return total_len;
}

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Functions

Detailed Description

Function Documentation

◆ color_xterm256_to_24bit()

Xterm Color Codes

Basic and Bright Colors

Color palette

Grey Scale Ramp

◆ ansi_color_list_add()

◆ ansi_color_parse()