azavea/geotrellis — pull request #74 by non (2012-05-02 15:24:22+00:00)
Title: Refactored PNG encoder.

This commit moves the PNG code to a model similar to the one we introduced
with GeoTIFF: a package containing an Encoder, Settings, and other data
types which conform closely to the PNG spec.

In addition, it adds the capability of rendering PNG files without using a
filter (previously, the Paeth filter was hardcoded).