man bestfit_color () - Finds a palette color fitting the requested RGB values. Allegro game programming library.
NAME
bestfit_color - Finds a palette color fitting the requested RGB values. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
int bestfit_color(const PALETTE pal, int r, int g, int b);
DESCRIPTION
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.
RETURN VALUE
Returns the index of the palette for the closest match to the requested color.