mapnik/mapnik — pull request #1966 by springmeyer (2013-07-25 05:02:32+00:00)
Title: Map background-image-comp-op and background-image-opacity

adds support for applying custom `comp_op` and `opacity` when blending a map background image into background color at render time - refs mapnik/mapnik-support#8

/cc @ajashton @skorasaurus @ryantroyford