The fastest method is to use the nearest-neighbour interpolation, but bilinear interpolation or trilinear interpolation between mipmaps are two commonly used alternatives which reduce aliasing or jaggies.
As a result, standard definition film transfers will sometimes display jaggies in highly detailed areas (window blinds, car grilles, chain link fences, and so on).
Jaggies in bitmaps, such as sprites and surface materials, are most often dealt with by separate texture filtering routines, which are far easier to perform than anti-aliasing filtering.