Wow, this is a big question, and it deserves a book-length answer. Short answer: Feminism has had almost no impact on the film industry. I know that sounds unlikely, but it's true. Read film critic Molly Haskell (and other feminist critics), and you'll see that strong, vibrant, three-dimensional roles for women were actually a lot more common in old Hollywood (pre-1968) than afterwards. There were stars then (like K. Hepburn, Crawford, Garbo, Rosalind Russell, et al) who could play strong women, and there was a market for movies where women held their own alongside men. But can you think of a single movie today that features a heroine as strong and vivid as Scarlett O'Hara in Gone With the Wind, or Lauren Bacall in To Have and Have Not, or Katharine Hepburn in Adam's Rib? Today's movies are all about catering to the teen male audience, and they want macho heroes and arm-candy female sidekicks. (Or spandex-clad heroines who aren't interesting except in their ability to shoot guns and cause as much mayhem as men.) There are still movies with strong roles for women, but they're in the independent sphere, on the fringe of the industry.
There are more women behind the scenes in Hollywood today, but they're not making cinema any more feminist. There are still only a handful of bankable women screenwriters and hardly any women directors. There are more women studio executives, but they greenlight exactly the same kind of movies as their male counterparts, movies that are more likely to make money than make any kind of feminist statement.
The most overtly feminist movie of the last 20 years is Thelma & Louise, a movie that suggests that women who try to protect themselves inevitably become outlaws, and that most men are not to be trusted to act in women's best interests. It was a big hit, but did you see any movies follow in its footsteps? Generally, women in movies are allowed to fight for their rights only if they suffer mightily for it (T&L, North Country, Norma Rae, Silkwood, The Accused) or allow themselves to be made over into Barbie dolls along the way (Legally Blonde, Miss Congeniality, Erin Brockovich).