Open DCX support

OpenDCX is an open-source C++ library comprising extensions for the OpenEXR library and its deep file format. It adds support for per deep-sample metadata comprising subpixel-masks and surface-type flags, and provides utility functions to manipulate deep pixels with this metadata. It is developed and maintained by DreamWorks Animation for use in rendering and compositing applications typically encountered in feature film production. The technical details of DCX are described in the paper Improved Deep Image Compositing Using Subpixel Masks

It would really be good to have that in Blender.

opendcx.org/documentation/doc/coding_guidelines.html