Vincent Rabaud 5183326ba8 Refactor the greedy histogram merge.
This is preparatory work for an upcoming commit.
No impact on speed or compression.

Change-Id: I62488ae6d2dbb5398f1604068c212ab8e26e82bc
2017-02-22 15:47:47 +01:00
..
2017-01-23 18:07:00 -08:00