azavea/geotrellis — pull request #247 by lossyrob (2012-12-05 16:31:46+00:00)
Title: Furthur optimizations for focal operations.

- Added a 'SpiralZag' traversal strategy, which ends up being slower than ZigZag, but will be good when we implement border tile rasters. Maybe. Moved Conway to Cellwise focal op.

- Removed ResultBuilder[T] concept

- Removed type concept on cursor. Optimized CursorMask.

Partially closes #94