256color.cc File Reference

Defines xterm256table. More...

#include "256color.hh"
#include "color.hh"

Include dependency graph for 256color.cc:

Functions
constexpr unsigned	Make16 (unsigned r, unsigned g, unsigned b)

Variables
constexpr unsigned char	grayramp [24] = { 1,2,3,5,6,7,8,9,11,12,13,14,16,17,18,19,20,22,23,24,25,27,28,29 }
constexpr unsigned char	colorramp [6] = { 0,12,16,21,26,31 }
const constinit std::array< unsigned, 256 >	xterm256table

Detailed Description

Defines xterm256table.

Function Documentation

Make16()

constexpr unsigned Make16 ( unsigned  r, unsigned  g, unsigned  b  )

constexpr

Converts 5-bit colors into 8-bit colors.

Variable Documentation

xterm256table

const constinit std::array<unsigned,256> xterm256table

Initial value:

= []() consteval
{
    std::array<unsigned,256> result =
    {
        Make16(0,0,0), Make16(21,0,0), Make16(0,21,0), Make16(21,10,0),
        Make16(0,0,21), Make16(21,0,21), Make16(0,21,21), Make16(21,21,21),
        Make16(15,15,15), Make16(31,10,10), Make16(5,31,10), Make16(31,31,10),
        Make16(10,10,31), Make16(31,10,31), Make16(5,31,31), Make16(31,31,31)
    };
    for(unsigned n=0; n<216; ++n) 
    {
        result[16+n] = Make16(colorramp[(n/36)%6], colorramp[(n/6)%6], colorramp[(n)%6]);
    }
    for(unsigned n=0; n<24; ++n) 
    {
        result[232 + n] = Make16(grayramp[n],grayramp[n],grayramp[n]);
    }
    return result;
}()

Builds and defines the table of 256 colors. 8-bit index, 24-bit value.