int init()
{
int c;
for (c = 0; c < 256; c++) {
COLOR_TABLE[c] = xterm_to_rgb(c);
}
return 0;
}
/**
* * Quantize RGB values to an xterm 256-color ID
* */
int rgb_to_xterm(int r, int g, int b)
{
int best_match = 0;
int smallest_distance = 1000000000;
int c, d;
if(rgb_init == false) {
for (c = 0; c < 256; c++) {
COLOR_TABLE[c] = xterm_to_rgb(c);
}
rgb_init = true;
}
for (c = 16; c < 256; c++) {
d = sqr(COLOR_TABLE[c].r - r) +
sqr(COLOR_TABLE[c].g - g) +
sqr(COLOR_TABLE[c].b - b);
if (d < smallest_distance) {
smallest_distance = d;
best_match = c;
}
}
return best_match;
}
/**
* * This function provides a quick and dirty way to serialize an rgb_t
* * struct to an int which can be decoded by our Python code using
* * ctypes.
* */
int xterm_to_rgb_i(int xcolor)
{
rgb_t res = xterm_to_rgb(xcolor);
return (res.r << 16) | (res.g << 8) | (res.b << 0);
}
