Implement sharpen

bug:7279964
bug:7247494
bug:7234321

- add a sharpen filter
- add infrastructure to use RenderScript
- some refactoring (add an ImageSlave class)
- add new zoom UI

Change-Id: Id94dc94d32866c7107b6818adf4db35d0c6c0b01
1 file changed
tree: a2ed60558301d02302c2b271ecfe72d8b62623d9
  1. res/
  2. src/
  3. src_pd/
  4. tests/