Colour and attributes. More...

#include "config.h"
#include <stddef.h>
#include <assert.h>
#include <string.h>
#include "mutt/lib.h"
#include "config/lib.h"
#include "core/lib.h"
#include "gui/lib.h"
#include "attr.h"
#include "color.h"
#include "curses2.h"
#include "debug.h"

Include dependency graph for attr.c:

Go to the source code of this file.

Functions
void	attr_color_clear (struct AttrColor *ac)
	Free the contents of an AttrColor.

void	attr_color_free (struct AttrColor **ptr)
	Free an AttrColor.

struct AttrColor *	attr_color_new (void)
	Create a new AttrColor.

void	attr_color_list_clear (struct AttrColorList *acl)
	Free the contents of an AttrColorList.

struct AttrColor *	attr_color_list_find (struct AttrColorList *acl, color_t fg, color_t bg, int attrs)
	Find an AttrColor in a list.

struct AttrColor	attr_color_copy (const struct AttrColor *ac)
	Copy a colour.

bool	attr_color_is_set (const struct AttrColor *ac)
	Is the object coloured?

bool	attr_color_match (struct AttrColor ac1, struct AttrColor ac2)
	Do the colours match?

void	modify_color_by_prefix (enum ColorPrefix prefix, bool is_fg, color_t col, int attrs)
	Modify a colour/attributes based on a prefix, e.g.

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

void	attr_color_overwrite (struct AttrColor ac_old, struct AttrColor ac_new)
	Update an AttrColor in-place.

Detailed Description

Colour and attributes.

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 attr.c.

Function Documentation

◆ attr_color_clear()

void attr_color_clear ( struct AttrColor * ac )

Free the contents of an AttrColor.

Parameters

ac	AttrColor to empty

Note: The AttrColor object isn't freed

Definition at line 49 of file attr.c.

{
  if (!ac)
    return;
 
  if (ac->curses_color)
    color_debug(LL_DEBUG5, "clear %p\n", (void *) ac);
  curses_color_free(&ac->curses_color);
 
  memset(&ac->fg, 0, sizeof(ac->fg));
  memset(&ac->bg, 0, sizeof(ac->bg));
 
  ac->fg.color = COLOR_DEFAULT;
  ac->bg.color = COLOR_DEFAULT;
  ac->attrs = A_NORMAL;
}

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◆ attr_color_free()

void attr_color_free ( struct AttrColor ** ptr )

Free an AttrColor.

Parameters

ptr	AttrColor to free

Definition at line 70 of file attr.c.

{
  if (!ptr || !*ptr)
    return;
 
  struct AttrColor *ac = *ptr;
  if (ac->ref_count > 1)
  {
    ac->ref_count--;
    *ptr = NULL;
    return;
  }
 
  attr_color_clear(ac);
  FREE(ptr);
}

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◆ attr_color_new()

struct AttrColor * attr_color_new ( void )

Create a new AttrColor.

Return values

ptr	New AttrColor

Definition at line 91 of file attr.c.

{
  struct AttrColor *ac = mutt_mem_calloc(1, sizeof(*ac));
 
  ac->fg.color = COLOR_DEFAULT;
  ac->fg.type = CT_SIMPLE;
  ac->fg.prefix = COLOR_PREFIX_NONE;
 
  ac->bg.color = COLOR_DEFAULT;
  ac->bg.type = CT_SIMPLE;
  ac->bg.prefix = COLOR_PREFIX_NONE;
 
  ac->attrs = A_NORMAL;
 
  ac->ref_count = 1;
 
  return ac;
}

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◆ attr_color_list_clear()

void attr_color_list_clear ( struct AttrColorList * acl )

Free the contents of an AttrColorList.

Parameters

acl	List to clear

Free each of the AttrColors in a list.

Note: The list object isn't freed, only emptied

Definition at line 118 of file attr.c.

{
  if (!acl)
    return;
 
  struct AttrColor *ac = NULL;
  struct AttrColor *tmp = NULL;
  TAILQ_FOREACH_SAFE(ac, acl, entries, tmp)
  {
    TAILQ_REMOVE(acl, ac, entries);
    attr_color_free(&ac);
  }
}

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◆ attr_color_list_find()

struct AttrColor * attr_color_list_find	(	struct AttrColorList *	acl,
		color_t	fg,
		color_t	bg,
		int	attrs
	)

Find an AttrColor in a list.

Parameters

acl	List to search
fg	Foreground colour
bg	Background colour
attrs	Attributes, e.g. A_UNDERLINE

Return values

ptr	Matching AttrColor

Definition at line 140 of file attr.c.

{
  if (!acl)
    return NULL;
 
  struct AttrColor *ac = NULL;
  TAILQ_FOREACH(ac, acl, entries)
  {
    if (ac->attrs != attrs)
      continue;
 
    struct CursesColor *cc = ac->curses_color;
    if (!cc)
      continue;
 
    if ((cc->fg == fg) && (cc->bg == bg))
      return ac;
  }
  return NULL;
}

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◆ attr_color_copy()

struct AttrColor attr_color_copy ( const struct AttrColor * ac )

Copy a colour.

Parameters

ac	Colour to copy

Return values

obj	Copy of the colour

Definition at line 167 of file attr.c.

{
  if (ac)
    return *ac;
  else
    return (struct AttrColor){ 0 };
}

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◆ attr_color_is_set()

bool attr_color_is_set ( const struct AttrColor * ac )

Is the object coloured?

Parameters

ac	Colour to check

Return values

true	Yes, a 'color' command has been used on this object

Definition at line 180 of file attr.c.

{
  if (!ac)
    return false;
 
  return ((ac->attrs != A_NORMAL) || ac->curses_color);
}

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◆ attr_color_match()

bool attr_color_match	(	struct AttrColor *	ac1,
		struct AttrColor *	ac2
	)

Do the colours match?

Parameters

ac1	First colour
ac2	Second colour

Return values

true	The colours and attributes match

Definition at line 194 of file attr.c.

{
  if ((!ac1) ^ (!ac2)) // One is set, but not the other
    return false;
 
  if (!ac1) // Two empty colours match
    return true;
 
  return ((ac1->curses_color == ac2->curses_color) && (ac1->attrs == ac2->attrs));
}

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◆ modify_color_by_prefix()

void modify_color_by_prefix	(	enum ColorPrefix	prefix,
		bool	is_fg,
		color_t *	col,
		int *	attrs
	)

Modify a colour/attributes based on a prefix, e.g.

"bright"

Parameters

[in]	prefix	prefix to apply
[in]	is_fg	true if a foreground colour should be modified
[in,out]	col	colour to modify
[in,out]	attrs	attributes to modify

Definition at line 212 of file attr.c.

{
  if (prefix == COLOR_PREFIX_NONE)
    return; // nothing to do here
 
  if (prefix == COLOR_PREFIX_ALERT)
  {
    *attrs |= A_BOLD;
    *attrs |= A_BLINK;
  }
  else if (is_fg)
  {
    if ((COLORS >= 16) && (prefix == COLOR_PREFIX_LIGHT))
    {
      if (*col <= 7)
      {
        /* Advance the color 0-7 by 8 to get the light version */
        *col += 8;
      }
    }
    else
    {
      *attrs |= A_BOLD;
    }
  }
  else
  {
    if (COLORS >= 16)
    {
      if (*col <= 7)
      {
        /* Advance the color 0-7 by 8 to get the light version */
        *col += 8;
      }
    }
  }
}

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◆ 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 321 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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◆ attr_color_overwrite()

void attr_color_overwrite	(	struct AttrColor *	ac_old,
		struct AttrColor *	ac_new
	)

Update an AttrColor in-place.

Parameters

ac_old	AttrColor to overwrite
ac_new	AttrColor to copy

Definition at line 396 of file attr.c.

{
  if (!ac_old || !ac_new)
    return;
 
  color_t fg = ac_new->fg.color;
  color_t bg = ac_new->bg.color;
  int attrs = ac_new->attrs;
 
  modify_color_by_prefix(ac_new->fg.prefix, true, &fg, &attrs);
  modify_color_by_prefix(ac_new->bg.prefix, false, &bg, &attrs);
 
#ifdef NEOMUTT_DIRECT_COLORS
  if ((ac_new->fg.type == CT_SIMPLE) || (ac_new->fg.type == CT_PALETTE))
    fg = color_xterm256_to_24bit(fg);
  else if (fg < 8)
    fg = 8;
  if ((ac_new->bg.type == CT_SIMPLE) || (ac_new->bg.type == CT_PALETTE))
    bg = color_xterm256_to_24bit(bg);
  else if (bg < 8)
    bg = 8;
#endif
 
  struct CursesColor *cc = curses_color_new(fg, bg);
  curses_color_free(&ac_old->curses_color);
  ac_old->fg = ac_new->fg;
  ac_old->bg = ac_new->bg;
  ac_old->attrs = attrs;
  ac_old->curses_color = cc;
}

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Functions

Detailed Description

Function Documentation

◆ attr_color_clear()

◆ attr_color_free()

◆ attr_color_new()

◆ attr_color_list_clear()

◆ attr_color_list_find()

◆ attr_color_copy()

◆ attr_color_is_set()

◆ attr_color_match()

◆ modify_color_by_prefix()

◆ color_xterm256_to_24bit()

Xterm Color Codes

Basic and Bright Colors

Color palette

Grey Scale Ramp

◆ attr_color_overwrite()