Porter-Duff Image Compositing: iterate on a list, or "Many Inputs to One Output" option.

[albamuth]

Would like an option to take one destination, and a list of sources, with list of x and y, and repeat the operation with a single output. Can't think of a better name, but something that conveys the idea of "Many to one." (rather than many-to-many or one-to-many).

This would make a result like Flattening Layers in Photoshop.
Example: Source 1 is composited onto Destination, then the result becomes the new Destination for Source 2 composited, then Source 3, until Source N.

With a single Destination:

• Inputting a batch (rather than list) of Sources would result in a batch output as normal.
• Unticking the "Many to One" option but with list input would also result in a list output.

With a list of Destinations:

• "Many to One" ON with list of Sources: Destination1 would composite Source1..n into a single output, and Destination2 would composite Source 1...n into a single output
• "Many to One" OFF with a list of Sources: Destination1 composited with Source1 only, Destination2 composited with Source2 only, etc.

Extra credit: Allow lists for Mode field (has to match Source list length) so compositing mode can be specified for each source layer.