Not directly using Allegro. Allegro supports the bios fonts, .fon, which are monochrome and fixed size, and it supports bitmap fonts, which can look any way you want, but can not be colored, and are also fixed size. If you don't need many sizes of fonts in your game, I suggest this approach, as you can create nice fonts in an image processing program. Then create a new font for each size.

Otherwise, I recommend the 'alfont' library, which integrates nicely with allegro, and can render standard true type fonts, supports antialiasing, coloring, and of course different font sizes.


-Ivan

The easiest way to get different fonts is to use TTF2PCX. You'll need to create bitmaps for every size that you want. If you need more flexibility than that, you'll need to use an add-on like AlFont or Glyph Keeper.