is_mono_font  -  Returns  TRUE  if a font is a monochrome font. Allegro
       game programming library.
       #include <allegro.h>
       int is_mono_font(FONT *f)
       This function checks if the given font is a mono font, as opposed to  a
       color font.
       Returns TRUE if the font is a monochrome font, FALSE if it is not.
       is_trans_font(3alleg), is_color_font(3alleg)