Simon Budig authored Apr 26, 2012 and Michael Natterer committed May 02, 2012

Doesn't work yet for 16bit PNGs, there is a weird crash in libgimp
but I didn't do anything...

This closely follows the old pixel region based code, which might
be suboptimal for gegl, but has the advantage of keeping metadata intact.

Indexed currently is disabled, needs resurrecting.