Check for __APPLE__ instead of __DARWIN__.
[movit] / overlay_effect.frag
2013-01-14 Steinar H. Gunderson Remove the code for postmultiplied alpha from OverlayE...
2013-01-14 Steinar H. GundersonAdd the rest of the files for the premultiplied alpha...
2013-01-12 Steinar H. GundersonAdded an overlay effect, implementing the atop effect.