NSCompositingOperation.sourceAtop
The source image wherever both images are opaque, the destination image wherever it is opaque but the source image is transparent, and transparent elsewhere
Declaration
case sourceAtopDiscussion
The source image is applied using the formula R = S*Da + D*(1 - Sa).
See Also
Operations for Compositing
NSCompositingOperation.clearNSCompositingOperation.copyNSCompositingOperation.sourceOverNSCompositingOperation.sourceInNSCompositingOperation.sourceOutNSCompositingOperation.destinationOverNSCompositingOperation.destinationInNSCompositingOperation.destinationOutNSCompositingOperation.destinationAtopNSCompositingOperation.xorNSCompositingOperation.plusDarkerNSCompositingOperation.plusLighterNSCompositingOperation.multiplyNSCompositingOperation.screenNSCompositingOperation.overlay