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Maniphest T32194

MASKS: Missing canonical Porter Duff alpha merge algorithm
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Description

It appears the basic Porter Duff merge algorithm was missing from the Mask blend layer mode.

The canonical algorithm for uncorrelated geometry should be:

Alpha.Out = Alpha.A + Alpha.B * ( 1 - Alpha.A)

Event Timeline

Troy Sobotka (sobotka) edited a custom field.Jul 27 2012, 3:12 AM
Troy Sobotka (sobotka) attached 1 file(s): F18366: patch-porterduffmerge.diff.
Campbell Barton (campbellbarton) changed the task status from Unknown Status to Resolved.Jul 28 2012, 1:36 PM