bestfit_color - Finds a palette color fitting the requested RGB values. Allegro
game programming library.
#include <allegro.h>
int bestfit_color(const PALETTE pal, int r, int g, int
b);
Searches the specified palette for the closest match to the requested color,
which are specified in the VGA hardware 0-63 format. Normally you should call
makecol8() instead, but this lower level function may be useful if you need to
use a palette other than the currently selected one, or specifically don't
want to use the rgb_map lookup table.
Returns the index of the palette for the closest match to the requested color.