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degesch: use hopefully better colors for nicks 

- exclude white from the 16-color range
 - use colors from the 256-color cube when available
This commit is contained in:
Přemysl Eric Janouch 2015-07-27 01:18:32 +02:00
parent 27cd8b3a63
commit a912b3f28c
1 changed files with 32 additions and 5 deletions
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37
degesch.c
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@ -2438,20 +2438,47 @@ formatter_parse_mirc (struct formatter *self, const char *s)
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static int *
filter_color_cube_for_acceptable_nick_colors (size_t *len)
{
static int table[6 * 6 * 6];
size_t len_counter = 0;
for (int x = 0; x < 6 * 6 * 6; x++)
{
int r = x / 36;
int g = (x / 6) % 6;
int b = (x % 6);
// Use the luma value of colours within the cube to filter colours that
// look okay-ish on terminals with both black and white backgrounds
double luma = 0.2126 * r / 6. + 0.7152 * g / 6. + 0.0722 * b / 6.;
if (luma >= .3 && luma <= .5)
table[len_counter++] = 16 + x;
}
*len = len_counter;
return table;
}
static void
formatter_parse_nick (struct formatter *self, char *s)
{
char *nick = irc_cut_nickname (s);
int color = siphash_wrapper (nick, strlen (nick)) % 8;
int color = siphash_wrapper (nick, strlen (nick)) % 7;
// Never use the black colour, could become transparent on black terminals;
// white is similarly excluded from the range
if (color == COLOR_BLACK)
color = -1;
size_t len;
// TODO: precompute this table
int *colors = filter_color_cube_for_acceptable_nick_colors (&len);
color |= colors[siphash_wrapper (nick, strlen (nick)) % len] << 16;
// We always use the default color for ourselves
if (self->s && irc_is_this_us (self->s, nick))
color = -1;
// Never use the black colour, could become transparent on black terminals
if (color == COLOR_BLACK)
color = -1;
FORMATTER_ADD_ITEM (self, FG_COLOR, .color = color);
char *x = irc_to_utf8 (self->ctx, nick);