Use fixed colour tables rather than generated and do a quick search for

exact match before doing the distance comparison.

1 files changed, 292 insertions, 85 deletions

diff --git a/colour.c b/colour.c
index 82f8533a..5929e982 100644
--- a/colour.c
+++ b/colour.c
@@ -29,91 +29,306 @@
  * of the 256 colour palette.
  */
 
-/* An RGB colour. */
 struct colour_rgb {
+	u_char  i;
 	u_char	r;
 	u_char	g;
 	u_char	b;
 };
 
-/* 256 colour RGB table, generated on first use. */
-struct colour_rgb *colour_rgb_256;
+const struct colour_rgb colour_from_256[] = {
+	{   0, 0x00, 0x00, 0x00 }, {   1, 0x00, 0x00, 0x5f },
+	{   2, 0x00, 0x00, 0x87 }, {   3, 0x00, 0x00, 0xaf },
+	{   4, 0x00, 0x00, 0xd7 }, {   5, 0x00, 0x00, 0xff },
+	{   6, 0x00, 0x5f, 0x00 }, {   7, 0x00, 0x5f, 0x5f },
+	{   8, 0x00, 0x5f, 0x87 }, {   9, 0x00, 0x5f, 0xaf },
+	{  10, 0x00, 0x5f, 0xd7 }, {  11, 0x00, 0x5f, 0xff },
+	{  12, 0x00, 0x87, 0x00 }, {  13, 0x00, 0x87, 0x5f },
+	{  14, 0x00, 0x87, 0x87 }, {  15, 0x00, 0x87, 0xaf },
+	{  16, 0x00, 0x87, 0xd7 }, {  17, 0x00, 0x87, 0xff },
+	{  18, 0x00, 0xaf, 0x00 }, {  19, 0x00, 0xaf, 0x5f },
+	{  20, 0x00, 0xaf, 0x87 }, {  21, 0x00, 0xaf, 0xaf },
+	{  22, 0x00, 0xaf, 0xd7 }, {  23, 0x00, 0xaf, 0xff },
+	{  24, 0x00, 0xd7, 0x00 }, {  25, 0x00, 0xd7, 0x5f },
+	{  26, 0x00, 0xd7, 0x87 }, {  27, 0x00, 0xd7, 0xaf },
+	{  28, 0x00, 0xd7, 0xd7 }, {  29, 0x00, 0xd7, 0xff },
+	{  30, 0x00, 0xff, 0x00 }, {  31, 0x00, 0xff, 0x5f },
+	{  32, 0x00, 0xff, 0x87 }, {  33, 0x00, 0xff, 0xaf },
+	{  34, 0x00, 0xff, 0xd7 }, {  35, 0x00, 0xff, 0xff },
+	{  36, 0x5f, 0x00, 0x00 }, {  37, 0x5f, 0x00, 0x5f },
+	{  38, 0x5f, 0x00, 0x87 }, {  39, 0x5f, 0x00, 0xaf },
+	{  40, 0x5f, 0x00, 0xd7 }, {  41, 0x5f, 0x00, 0xff },
+	{  42, 0x5f, 0x5f, 0x00 }, {  43, 0x5f, 0x5f, 0x5f },
+	{  44, 0x5f, 0x5f, 0x87 }, {  45, 0x5f, 0x5f, 0xaf },
+	{  46, 0x5f, 0x5f, 0xd7 }, {  47, 0x5f, 0x5f, 0xff },
+	{  48, 0x5f, 0x87, 0x00 }, {  49, 0x5f, 0x87, 0x5f },
+	{  50, 0x5f, 0x87, 0x87 }, {  51, 0x5f, 0x87, 0xaf },
+	{  52, 0x5f, 0x87, 0xd7 }, {  53, 0x5f, 0x87, 0xff },
+	{  54, 0x5f, 0xaf, 0x00 }, {  55, 0x5f, 0xaf, 0x5f },
+	{  56, 0x5f, 0xaf, 0x87 }, {  57, 0x5f, 0xaf, 0xaf },
+	{  58, 0x5f, 0xaf, 0xd7 }, {  59, 0x5f, 0xaf, 0xff },
+	{  60, 0x5f, 0xd7, 0x00 }, {  61, 0x5f, 0xd7, 0x5f },
+	{  62, 0x5f, 0xd7, 0x87 }, {  63, 0x5f, 0xd7, 0xaf },
+	{  64, 0x5f, 0xd7, 0xd7 }, {  65, 0x5f, 0xd7, 0xff },
+	{  66, 0x5f, 0xff, 0x00 }, {  67, 0x5f, 0xff, 0x5f },
+	{  68, 0x5f, 0xff, 0x87 }, {  69, 0x5f, 0xff, 0xaf },
+	{  70, 0x5f, 0xff, 0xd7 }, {  71, 0x5f, 0xff, 0xff },
+	{  72, 0x87, 0x00, 0x00 }, {  73, 0x87, 0x00, 0x5f },
+	{  74, 0x87, 0x00, 0x87 }, {  75, 0x87, 0x00, 0xaf },
+	{  76, 0x87, 0x00, 0xd7 }, {  77, 0x87, 0x00, 0xff },
+	{  78, 0x87, 0x5f, 0x00 }, {  79, 0x87, 0x5f, 0x5f },
+	{  80, 0x87, 0x5f, 0x87 }, {  81, 0x87, 0x5f, 0xaf },
+	{  82, 0x87, 0x5f, 0xd7 }, {  83, 0x87, 0x5f, 0xff },
+	{  84, 0x87, 0x87, 0x00 }, {  85, 0x87, 0x87, 0x5f },
+	{  86, 0x87, 0x87, 0x87 }, {  87, 0x87, 0x87, 0xaf },
+	{  88, 0x87, 0x87, 0xd7 }, {  89, 0x87, 0x87, 0xff },
+	{  90, 0x87, 0xaf, 0x00 }, {  91, 0x87, 0xaf, 0x5f },
+	{  92, 0x87, 0xaf, 0x87 }, {  93, 0x87, 0xaf, 0xaf },
+	{  94, 0x87, 0xaf, 0xd7 }, {  95, 0x87, 0xaf, 0xff },
+	{  96, 0x87, 0xd7, 0x00 }, {  97, 0x87, 0xd7, 0x5f },
+	{  98, 0x87, 0xd7, 0x87 }, {  99, 0x87, 0xd7, 0xaf },
+	{ 100, 0x87, 0xd7, 0xd7 }, { 101, 0x87, 0xd7, 0xff },
+	{ 102, 0x87, 0xff, 0x00 }, { 103, 0x87, 0xff, 0x5f },
+	{ 104, 0x87, 0xff, 0x87 }, { 105, 0x87, 0xff, 0xaf },
+	{ 106, 0x87, 0xff, 0xd7 }, { 107, 0x87, 0xff, 0xff },
+	{ 108, 0xaf, 0x00, 0x00 }, { 109, 0xaf, 0x00, 0x5f },
+	{ 110, 0xaf, 0x00, 0x87 }, { 111, 0xaf, 0x00, 0xaf },
+	{ 112, 0xaf, 0x00, 0xd7 }, { 113, 0xaf, 0x00, 0xff },
+	{ 114, 0xaf, 0x5f, 0x00 }, { 115, 0xaf, 0x5f, 0x5f },
+	{ 116, 0xaf, 0x5f, 0x87 }, { 117, 0xaf, 0x5f, 0xaf },
+	{ 118, 0xaf, 0x5f, 0xd7 }, { 119, 0xaf, 0x5f, 0xff },
+	{ 120, 0xaf, 0x87, 0x00 }, { 121, 0xaf, 0x87, 0x5f },
+	{ 122, 0xaf, 0x87, 0x87 }, { 123, 0xaf, 0x87, 0xaf },
+	{ 124, 0xaf, 0x87, 0xd7 }, { 125, 0xaf, 0x87, 0xff },
+	{ 126, 0xaf, 0xaf, 0x00 }, { 127, 0xaf, 0xaf, 0x5f },
+	{ 128, 0xaf, 0xaf, 0x87 }, { 129, 0xaf, 0xaf, 0xaf },
+	{ 130, 0xaf, 0xaf, 0xd7 }, { 131, 0xaf, 0xaf, 0xff },
+	{ 132, 0xaf, 0xd7, 0x00 }, { 133, 0xaf, 0xd7, 0x5f },
+	{ 134, 0xaf, 0xd7, 0x87 }, { 135, 0xaf, 0xd7, 0xaf },
+	{ 136, 0xaf, 0xd7, 0xd7 }, { 137, 0xaf, 0xd7, 0xff },
+	{ 138, 0xaf, 0xff, 0x00 }, { 139, 0xaf, 0xff, 0x5f },
+	{ 140, 0xaf, 0xff, 0x87 }, { 141, 0xaf, 0xff, 0xaf },
+	{ 142, 0xaf, 0xff, 0xd7 }, { 143, 0xaf, 0xff, 0xff },
+	{ 144, 0xd7, 0x00, 0x00 }, { 145, 0xd7, 0x00, 0x5f },
+	{ 146, 0xd7, 0x00, 0x87 }, { 147, 0xd7, 0x00, 0xaf },
+	{ 148, 0xd7, 0x00, 0xd7 }, { 149, 0xd7, 0x00, 0xff },
+	{ 150, 0xd7, 0x5f, 0x00 }, { 151, 0xd7, 0x5f, 0x5f },
+	{ 152, 0xd7, 0x5f, 0x87 }, { 153, 0xd7, 0x5f, 0xaf },
+	{ 154, 0xd7, 0x5f, 0xd7 }, { 155, 0xd7, 0x5f, 0xff },
+	{ 156, 0xd7, 0x87, 0x00 }, { 157, 0xd7, 0x87, 0x5f },
+	{ 158, 0xd7, 0x87, 0x87 }, { 159, 0xd7, 0x87, 0xaf },
+	{ 160, 0xd7, 0x87, 0xd7 }, { 161, 0xd7, 0x87, 0xff },
+	{ 162, 0xd7, 0xaf, 0x00 }, { 163, 0xd7, 0xaf, 0x5f },
+	{ 164, 0xd7, 0xaf, 0x87 }, { 165, 0xd7, 0xaf, 0xaf },
+	{ 166, 0xd7, 0xaf, 0xd7 }, { 167, 0xd7, 0xaf, 0xff },
+	{ 168, 0xd7, 0xd7, 0x00 }, { 169, 0xd7, 0xd7, 0x5f },
+	{ 170, 0xd7, 0xd7, 0x87 }, { 171, 0xd7, 0xd7, 0xaf },
+	{ 172, 0xd7, 0xd7, 0xd7 }, { 173, 0xd7, 0xd7, 0xff },
+	{ 174, 0xd7, 0xff, 0x00 }, { 175, 0xd7, 0xff, 0x5f },
+	{ 176, 0xd7, 0xff, 0x87 }, { 177, 0xd7, 0xff, 0xaf },
+	{ 178, 0xd7, 0xff, 0xd7 }, { 179, 0xd7, 0xff, 0xff },
+	{ 180, 0xff, 0x00, 0x00 }, { 181, 0xff, 0x00, 0x5f },
+	{ 182, 0xff, 0x00, 0x87 }, { 183, 0xff, 0x00, 0xaf },
+	{ 184, 0xff, 0x00, 0xd7 }, { 185, 0xff, 0x00, 0xff },
+	{ 186, 0xff, 0x5f, 0x00 }, { 187, 0xff, 0x5f, 0x5f },
+	{ 188, 0xff, 0x5f, 0x87 }, { 189, 0xff, 0x5f, 0xaf },
+	{ 190, 0xff, 0x5f, 0xd7 }, { 191, 0xff, 0x5f, 0xff },
+	{ 192, 0xff, 0x87, 0x00 }, { 193, 0xff, 0x87, 0x5f },
+	{ 194, 0xff, 0x87, 0x87 }, { 195, 0xff, 0x87, 0xaf },
+	{ 196, 0xff, 0x87, 0xd7 }, { 197, 0xff, 0x87, 0xff },
+	{ 198, 0xff, 0xaf, 0x00 }, { 199, 0xff, 0xaf, 0x5f },
+	{ 200, 0xff, 0xaf, 0x87 }, { 201, 0xff, 0xaf, 0xaf },
+	{ 202, 0xff, 0xaf, 0xd7 }, { 203, 0xff, 0xaf, 0xff },
+	{ 204, 0xff, 0xd7, 0x00 }, { 205, 0xff, 0xd7, 0x5f },
+	{ 206, 0xff, 0xd7, 0x87 }, { 207, 0xff, 0xd7, 0xaf },
+	{ 208, 0xff, 0xd7, 0xd7 }, { 209, 0xff, 0xd7, 0xff },
+	{ 210, 0xff, 0xff, 0x00 }, { 211, 0xff, 0xff, 0x5f },
+	{ 212, 0xff, 0xff, 0x87 }, { 213, 0xff, 0xff, 0xaf },
+	{ 214, 0xff, 0xff, 0xd7 }, { 215, 0xff, 0xff, 0xff },
+	{ 216, 0x08, 0x08, 0x08 }, { 217, 0x12, 0x12, 0x12 },
+	{ 218, 0x1c, 0x1c, 0x1c }, { 219, 0x26, 0x26, 0x26 },
+	{ 220, 0x30, 0x30, 0x30 }, { 221, 0x3a, 0x3a, 0x3a },
+	{ 222, 0x44, 0x44, 0x44 }, { 223, 0x4e, 0x4e, 0x4e },
+	{ 224, 0x58, 0x58, 0x58 }, { 225, 0x62, 0x62, 0x62 },
+	{ 226, 0x6c, 0x6c, 0x6c }, { 227, 0x76, 0x76, 0x76 },
+	{ 228, 0x80, 0x80, 0x80 }, { 229, 0x8a, 0x8a, 0x8a },
+	{ 230, 0x94, 0x94, 0x94 }, { 231, 0x9e, 0x9e, 0x9e },
+	{ 232, 0xa8, 0xa8, 0xa8 }, { 233, 0xb2, 0xb2, 0xb2 },
+	{ 234, 0xbc, 0xbc, 0xbc }, { 235, 0xc6, 0xc6, 0xc6 },
+	{ 236, 0xd0, 0xd0, 0xd0 }, { 237, 0xda, 0xda, 0xda },
+	{ 238, 0xe4, 0xe4, 0xe4 }, { 239, 0xee, 0xee, 0xee },
+};
+const struct colour_rgb colour_to_256[] = {
+	{   0, 0x00, 0x00, 0x00 }, {   1, 0x00, 0x00, 0x5f },
+	{   2, 0x00, 0x00, 0x87 }, {   3, 0x00, 0x00, 0xaf },
+	{   4, 0x00, 0x00, 0xd7 }, {   5, 0x00, 0x00, 0xff },
+	{   6, 0x00, 0x5f, 0x00 }, {   7, 0x00, 0x5f, 0x5f },
+	{   8, 0x00, 0x5f, 0x87 }, {   9, 0x00, 0x5f, 0xaf },
+	{  10, 0x00, 0x5f, 0xd7 }, {  11, 0x00, 0x5f, 0xff },
+	{  12, 0x00, 0x87, 0x00 }, {  13, 0x00, 0x87, 0x5f },
+	{  14, 0x00, 0x87, 0x87 }, {  15, 0x00, 0x87, 0xaf },
+	{  16, 0x00, 0x87, 0xd7 }, {  17, 0x00, 0x87, 0xff },
+	{  18, 0x00, 0xaf, 0x00 }, {  19, 0x00, 0xaf, 0x5f },
+	{  20, 0x00, 0xaf, 0x87 }, {  21, 0x00, 0xaf, 0xaf },
+	{  22, 0x00, 0xaf, 0xd7 }, {  23, 0x00, 0xaf, 0xff },
+	{  24, 0x00, 0xd7, 0x00 }, {  25, 0x00, 0xd7, 0x5f },
+	{  26, 0x00, 0xd7, 0x87 }, {  27, 0x00, 0xd7, 0xaf },
+	{  28, 0x00, 0xd7, 0xd7 }, {  29, 0x00, 0xd7, 0xff },
+	{  30, 0x00, 0xff, 0x00 }, {  31, 0x00, 0xff, 0x5f },
+	{  32, 0x00, 0xff, 0x87 }, {  33, 0x00, 0xff, 0xaf },
+	{  34, 0x00, 0xff, 0xd7 }, {  35, 0x00, 0xff, 0xff },
+	{ 216, 0x08, 0x08, 0x08 }, { 217, 0x12, 0x12, 0x12 },
+	{ 218, 0x1c, 0x1c, 0x1c }, { 219, 0x26, 0x26, 0x26 },
+	{ 220, 0x30, 0x30, 0x30 }, { 221, 0x3a, 0x3a, 0x3a },
+	{ 222, 0x44, 0x44, 0x44 }, { 223, 0x4e, 0x4e, 0x4e },
+	{ 224, 0x58, 0x58, 0x58 }, {  36, 0x5f, 0x00, 0x00 },
+	{  37, 0x5f, 0x00, 0x5f }, {  38, 0x5f, 0x00, 0x87 },
+	{  39, 0x5f, 0x00, 0xaf }, {  40, 0x5f, 0x00, 0xd7 },
+	{  41, 0x5f, 0x00, 0xff }, {  42, 0x5f, 0x5f, 0x00 },
+	{  43, 0x5f, 0x5f, 0x5f }, {  44, 0x5f, 0x5f, 0x87 },
+	{  45, 0x5f, 0x5f, 0xaf }, {  46, 0x5f, 0x5f, 0xd7 },
+	{  47, 0x5f, 0x5f, 0xff }, {  48, 0x5f, 0x87, 0x00 },
+	{  49, 0x5f, 0x87, 0x5f }, {  50, 0x5f, 0x87, 0x87 },
+	{  51, 0x5f, 0x87, 0xaf }, {  52, 0x5f, 0x87, 0xd7 },
+	{  53, 0x5f, 0x87, 0xff }, {  54, 0x5f, 0xaf, 0x00 },
+	{  55, 0x5f, 0xaf, 0x5f }, {  56, 0x5f, 0xaf, 0x87 },
+	{  57, 0x5f, 0xaf, 0xaf }, {  58, 0x5f, 0xaf, 0xd7 },
+	{  59, 0x5f, 0xaf, 0xff }, {  60, 0x5f, 0xd7, 0x00 },
+	{  61, 0x5f, 0xd7, 0x5f }, {  62, 0x5f, 0xd7, 0x87 },
+	{  63, 0x5f, 0xd7, 0xaf }, {  64, 0x5f, 0xd7, 0xd7 },
+	{  65, 0x5f, 0xd7, 0xff }, {  66, 0x5f, 0xff, 0x00 },
+	{  67, 0x5f, 0xff, 0x5f }, {  68, 0x5f, 0xff, 0x87 },
+	{  69, 0x5f, 0xff, 0xaf }, {  70, 0x5f, 0xff, 0xd7 },
+	{  71, 0x5f, 0xff, 0xff }, { 225, 0x62, 0x62, 0x62 },
+	{ 226, 0x6c, 0x6c, 0x6c }, { 227, 0x76, 0x76, 0x76 },
+	{ 228, 0x80, 0x80, 0x80 }, {  72, 0x87, 0x00, 0x00 },
+	{  73, 0x87, 0x00, 0x5f }, {  74, 0x87, 0x00, 0x87 },
+	{  75, 0x87, 0x00, 0xaf }, {  76, 0x87, 0x00, 0xd7 },
+	{  77, 0x87, 0x00, 0xff }, {  78, 0x87, 0x5f, 0x00 },
+	{  79, 0x87, 0x5f, 0x5f }, {  80, 0x87, 0x5f, 0x87 },
+	{  81, 0x87, 0x5f, 0xaf }, {  82, 0x87, 0x5f, 0xd7 },
+	{  83, 0x87, 0x5f, 0xff }, {  84, 0x87, 0x87, 0x00 },
+	{  85, 0x87, 0x87, 0x5f }, {  86, 0x87, 0x87, 0x87 },
+	{  87, 0x87, 0x87, 0xaf }, {  88, 0x87, 0x87, 0xd7 },
+	{  89, 0x87, 0x87, 0xff }, {  90, 0x87, 0xaf, 0x00 },
+	{  91, 0x87, 0xaf, 0x5f }, {  92, 0x87, 0xaf, 0x87 },
+	{  93, 0x87, 0xaf, 0xaf }, {  94, 0x87, 0xaf, 0xd7 },
+	{  95, 0x87, 0xaf, 0xff }, {  96, 0x87, 0xd7, 0x00 },
+	{  97, 0x87, 0xd7, 0x5f }, {  98, 0x87, 0xd7, 0x87 },
+	{  99, 0x87, 0xd7, 0xaf }, { 100, 0x87, 0xd7, 0xd7 },
+	{ 101, 0x87, 0xd7, 0xff }, { 102, 0x87, 0xff, 0x00 },
+	{ 103, 0x87, 0xff, 0x5f }, { 104, 0x87, 0xff, 0x87 },
+	{ 105, 0x87, 0xff, 0xaf }, { 106, 0x87, 0xff, 0xd7 },
+	{ 107, 0x87, 0xff, 0xff }, { 229, 0x8a, 0x8a, 0x8a },
+	{ 230, 0x94, 0x94, 0x94 }, { 231, 0x9e, 0x9e, 0x9e },
+	{ 232, 0xa8, 0xa8, 0xa8 }, { 108, 0xaf, 0x00, 0x00 },
+	{ 109, 0xaf, 0x00, 0x5f }, { 110, 0xaf, 0x00, 0x87 },
+	{ 111, 0xaf, 0x00, 0xaf }, { 112, 0xaf, 0x00, 0xd7 },
+	{ 113, 0xaf, 0x00, 0xff }, { 114, 0xaf, 0x5f, 0x00 },
+	{ 115, 0xaf, 0x5f, 0x5f }, { 116, 0xaf, 0x5f, 0x87 },
+	{ 117, 0xaf, 0x5f, 0xaf }, { 118, 0xaf, 0x5f, 0xd7 },
+	{ 119, 0xaf, 0x5f, 0xff }, { 120, 0xaf, 0x87, 0x00 },
+	{ 121, 0xaf, 0x87, 0x5f }, { 122, 0xaf, 0x87, 0x87 },
+	{ 123, 0xaf, 0x87, 0xaf }, { 124, 0xaf, 0x87, 0xd7 },
+	{ 125, 0xaf, 0x87, 0xff }, { 126, 0xaf, 0xaf, 0x00 },
+	{ 127, 0xaf, 0xaf, 0x5f }, { 128, 0xaf, 0xaf, 0x87 },
+	{ 129, 0xaf, 0xaf, 0xaf }, { 130, 0xaf, 0xaf, 0xd7 },
+	{ 131, 0xaf, 0xaf, 0xff }, { 132, 0xaf, 0xd7, 0x00 },
+	{ 133, 0xaf, 0xd7, 0x5f }, { 134, 0xaf, 0xd7, 0x87 },
+	{ 135, 0xaf, 0xd7, 0xaf }, { 136, 0xaf, 0xd7, 0xd7 },
+	{ 137, 0xaf, 0xd7, 0xff }, { 138, 0xaf, 0xff, 0x00 },
+	{ 139, 0xaf, 0xff, 0x5f }, { 140, 0xaf, 0xff, 0x87 },
+	{ 141, 0xaf, 0xff, 0xaf }, { 142, 0xaf, 0xff, 0xd7 },
+	{ 143, 0xaf, 0xff, 0xff }, { 233, 0xb2, 0xb2, 0xb2 },
+	{ 234, 0xbc, 0xbc, 0xbc }, { 235, 0xc6, 0xc6, 0xc6 },
+	{ 236, 0xd0, 0xd0, 0xd0 }, { 144, 0xd7, 0x00, 0x00 },
+	{ 145, 0xd7, 0x00, 0x5f }, { 146, 0xd7, 0x00, 0x87 },
+	{ 147, 0xd7, 0x00, 0xaf }, { 148, 0xd7, 0x00, 0xd7 },
+	{ 149, 0xd7, 0x00, 0xff }, { 150, 0xd7, 0x5f, 0x00 },
+	{ 151, 0xd7, 0x5f, 0x5f }, { 152, 0xd7, 0x5f, 0x87 },
+	{ 153, 0xd7, 0x5f, 0xaf }, { 154, 0xd7, 0x5f, 0xd7 },
+	{ 155, 0xd7, 0x5f, 0xff }, { 156, 0xd7, 0x87, 0x00 },
+	{ 157, 0xd7, 0x87, 0x5f }, { 158, 0xd7, 0x87, 0x87 },
+	{ 159, 0xd7, 0x87, 0xaf }, { 160, 0xd7, 0x87, 0xd7 },
+	{ 161, 0xd7, 0x87, 0xff }, { 162, 0xd7, 0xaf, 0x00 },
+	{ 163, 0xd7, 0xaf, 0x5f }, { 164, 0xd7, 0xaf, 0x87 },
+	{ 165, 0xd7, 0xaf, 0xaf }, { 166, 0xd7, 0xaf, 0xd7 },
+	{ 167, 0xd7, 0xaf, 0xff }, { 168, 0xd7, 0xd7, 0x00 },
+	{ 169, 0xd7, 0xd7, 0x5f }, { 170, 0xd7, 0xd7, 0x87 },
+	{ 171, 0xd7, 0xd7, 0xaf }, { 172, 0xd7, 0xd7, 0xd7 },
+	{ 173, 0xd7, 0xd7, 0xff }, { 174, 0xd7, 0xff, 0x00 },
+	{ 175, 0xd7, 0xff, 0x5f }, { 176, 0xd7, 0xff, 0x87 },
+	{ 177, 0xd7, 0xff, 0xaf }, { 178, 0xd7, 0xff, 0xd7 },
+	{ 179, 0xd7, 0xff, 0xff }, { 237, 0xda, 0xda, 0xda },
+	{ 238, 0xe4, 0xe4, 0xe4 }, { 239, 0xee, 0xee, 0xee },
+	{ 180, 0xff, 0x00, 0x00 }, { 181, 0xff, 0x00, 0x5f },
+	{ 182, 0xff, 0x00, 0x87 }, { 183, 0xff, 0x00, 0xaf },
+	{ 184, 0xff, 0x00, 0xd7 }, { 185, 0xff, 0x00, 0xff },
+	{ 186, 0xff, 0x5f, 0x00 }, { 187, 0xff, 0x5f, 0x5f },
+	{ 188, 0xff, 0x5f, 0x87 }, { 189, 0xff, 0x5f, 0xaf },
+	{ 190, 0xff, 0x5f, 0xd7 }, { 191, 0xff, 0x5f, 0xff },
+	{ 192, 0xff, 0x87, 0x00 }, { 193, 0xff, 0x87, 0x5f },
+	{ 194, 0xff, 0x87, 0x87 }, { 195, 0xff, 0x87, 0xaf },
+	{ 196, 0xff, 0x87, 0xd7 }, { 197, 0xff, 0x87, 0xff },
+	{ 198, 0xff, 0xaf, 0x00 }, { 199, 0xff, 0xaf, 0x5f },
+	{ 200, 0xff, 0xaf, 0x87 }, { 201, 0xff, 0xaf, 0xaf },
+	{ 202, 0xff, 0xaf, 0xd7 }, { 203, 0xff, 0xaf, 0xff },
+	{ 204, 0xff, 0xd7, 0x00 }, { 205, 0xff, 0xd7, 0x5f },
+	{ 206, 0xff, 0xd7, 0x87 }, { 207, 0xff, 0xd7, 0xaf },
+	{ 208, 0xff, 0xd7, 0xd7 }, { 209, 0xff, 0xd7, 0xff },
+	{ 210, 0xff, 0xff, 0x00 }, { 211, 0xff, 0xff, 0x5f },
+	{ 212, 0xff, 0xff, 0x87 }, { 213, 0xff, 0xff, 0xaf },
+	{ 214, 0xff, 0xff, 0xd7 }, { 215, 0xff, 0xff, 0xff },
+};
 
-void	colour_rgb_generate256(void);
-u_int	colour_rgb_distance(struct colour_rgb *, struct colour_rgb *);
+int	colour_rgb_cmp(const void *, const void *);
 int	colour_rgb_find(struct colour_rgb *);
 
-/* Generate 256 colour RGB table. */
-void
-colour_rgb_generate256(void)
+/* Compare function for bsearch(). */
+int
+colour_rgb_cmp(const void *lhs0, const void *rhs0)
 {
-	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++;
-		}
-	}
+	const struct colour_rgb *lhs = lhs0, *rhs = rhs0;
 
-	/* Then add the greys. */
-	for (i = 24; i > 0; i--) {
-		rgb = &colour_rgb_256[240 - i];
+	if (lhs->r < rhs->r)
+		return (-1);
+	if (lhs->r > rhs->r)
+		return (1);
 
-		rgb->r = 8 + (24 - i) * 10;
-		rgb->g = 8 + (24 - i) * 10;
-		rgb->b = 8 + (24 - i) * 10;
-	}
-}
+	if (lhs->g < rhs->g)
+		return (-1);
+	if (lhs->g > rhs->g)
+		return (1);
 
-/* Get colour RGB distance. */
-u_int
-colour_rgb_distance(struct colour_rgb *rgb1, struct colour_rgb *rgb2)
-{
-	int	r, g, b;
+	if (lhs->b < rhs->b)
+		return (-1);
+	if (lhs->b > rhs->b)
+		return (1);
 
-	r = rgb1->r - rgb2->r;
-	g = rgb1->g - rgb2->g;
-	b = rgb1->b - rgb2->b;
-	return (r * r + g * g + b * b);
+	return (0);
 }
 
 /* Work out the nearest colour from the 256 colour set. */
 int
 colour_rgb_find(struct colour_rgb *rgb)
 {
-	u_int	distance, lowest, colour, i;
+	struct colour_rgb	*found;
+	u_int			 distance, lowest, colour, i;
+	int			 r, g, b;
 
-	if (colour_rgb_256 == NULL)
-		colour_rgb_generate256();
+	found = bsearch(rgb, colour_to_256, nitems(colour_to_256),
+	    sizeof colour_to_256[0], colour_rgb_cmp);
+	if (found != NULL)
+		return (16 + found->i);
 
 	colour = 16;
 	lowest = UINT_MAX;
 	for (i = 0; i < 240; i++) {
-		distance = colour_rgb_distance(&colour_rgb_256[i], rgb);
+		r = colour_from_256[i].r - rgb->r;
+		g = colour_from_256[i].g - rgb->g;
+		b = colour_from_256[i].b - rgb->b;
+
+		distance = r * r + g * g + b * b;
 		if (distance < lowest) {
 			lowest = distance;
 			colour = 16 + i;
@@ -217,47 +432,39 @@ colour_fromstring(const char *s)
 		return (n | 0x100);
 	}
 
-	if (strcasecmp(s, "black") == 0 || (s[0] == '0' && s[1] == '\0'))
+	if (strcasecmp(s, "black") == 0 || strcmp(s, "0") == 0)
 		return (0);
-	if (strcasecmp(s, "red") == 0 || (s[0] == '1' && s[1] == '\0'))
+	if (strcasecmp(s, "red") == 0 || strcmp(s, "1") == 0)
 		return (1);
-	if (strcasecmp(s, "green") == 0 || (s[0] == '2' && s[1] == '\0'))
+	if (strcasecmp(s, "green") == 0 || strcmp(s, "2") == 0)
 		return (2);
-	if (strcasecmp(s, "yellow") == 0 || (s[0] == '3' && s[1] == '\0'))
+	if (strcasecmp(s, "yellow") == 0 || strcmp(s, "3") == 0)
 		return (3);
-	if (strcasecmp(s, "blue") == 0 || (s[0] == '4' && s[1] == '\0'))
+	if (strcasecmp(s, "blue") == 0 || strcmp(s, "4") == 0)
 		return (4);
-	if (strcasecmp(s, "magenta") == 0 || (s[0] == '5' && s[1] == '\0'))
+	if (strcasecmp(s, "magenta") == 0 || strcmp(s, "5") == 0)
 		return (5);
-	if (strcasecmp(s, "cyan") == 0 || (s[0] == '6' && s[1] == '\0'))
+	if (strcasecmp(s, "cyan") == 0 || strcmp(s, "6") == 0)
 		return (6);
-	if (strcasecmp(s, "white") == 0 || (s[0] == '7' && s[1] == '\0'))
+	if (strcasecmp(s, "white") == 0 || strcmp(s, "7") == 0)
 		return (7);
-	if (strcasecmp(s, "default") == 0 || (s[0] == '8' && s[1] == '\0'))
+	if (strcasecmp(s, "default") == 0 || strcmp(s, "8") == 0)
 		return (8);
-	if (strcasecmp(s, "brightblack") == 0 ||
-	    (s[0] == '9' && s[1] == '0' && s[2] == '\0'))
+	if (strcasecmp(s, "brightblack") == 0 || strcmp(s, "90") == 0)
 		return (90);
-	if (strcasecmp(s, "brightred") == 0 ||
-	    (s[0] == '9' && s[1] == '1' && s[2] == '\0'))
+	if (strcasecmp(s, "brightred") == 0 || strcmp(s, "91") == 0)
 		return (91);
-	if (strcasecmp(s, "brightgreen") == 0 ||
-	    (s[0] == '9' && s[1] == '2' && s[2] == '\0'))
+	if (strcasecmp(s, "brightgreen") == 0 || strcmp(s, "92") == 0)
 		return (92);
-	if (strcasecmp(s, "brightyellow") == 0 ||
-	    (s[0] == '9' && s[1] == '3' && s[2] == '\0'))
+	if (strcasecmp(s, "brightyellow") == 0 || strcmp(s, "93") == 0)
 		return (93);
-	if (strcasecmp(s, "brightblue") == 0 ||
-	    (s[0] == '9' && s[1] == '4' && s[2] == '\0'))
+	if (strcasecmp(s, "brightblue") == 0 || strcmp(s, "94") == 0)
 		return (94);
-	if (strcasecmp(s, "brightmagenta") == 0 ||
-	    (s[0] == '9' && s[1] == '5' && s[2] == '\0'))
+	if (strcasecmp(s, "brightmagenta") == 0 || strcmp(s, "95") == 0)
 		return (95);
-	if (strcasecmp(s, "brightcyan") == 0 ||
-	    (s[0] == '9' && s[1] == '6' && s[2] == '\0'))
+	if (strcasecmp(s, "brightcyan") == 0 || strcmp(s, "96") == 0)
 		return (96);
-	if (strcasecmp(s, "brightwhite") == 0 ||
-	    (s[0] == '9' && s[1] == '7' && s[2] == '\0'))
+	if (strcasecmp(s, "brightwhite") == 0 || strcmp(s, "97") == 0)
 		return (97);
 	return (-1);
 }