"Snow White and the Huntsman" is a film of conflicting spells. One of them, which approaches pure enchantment, has been woven from dazzling imagery, inspired design and a pair of powerful performances: Charlize Theron as Snow White's persecutor, Queen Ravenna, and Chris Hemsworth as the put-upon heroine's protector, the Huntsman of the title. An evil spell nearly does Snow White in, but it's lifted in the nick of time. The strangest spell afflicts Kristen Stewart; she can't seem to imbue Snow White with anything more than a semblance of feeling. That spell never lifts, but it doesn't make much difference in the end because the forces of good manage to work around it. This ambitious production was directed by Rupert Sanders, a first-time feature filmmaker who made his reputation with television commercials. He's a whiz at visual storytelling, and he has surrounded himself with such top-notch collaborators as the production designer Dominic Watkins...