mikechambers/as3corelib — pull request #190 by assaflavie (2013-03-31 13:03:33+00:00)
Title: 5x faster PNG compression of non-transparent bitmaps

...much faster (about 5x as fast) than copying the pixels one by one.
The same optimization could very well work for the transparent option - I just didn't need it so I didn't touch it.