Hi again,
I’ve worked a bit more on the drawn mask (which I’ve renamed to “Brush mask” in the GUI), I think now it’s ready for some testing/feedback. People who are interested will find it in the drawn-masks branch.
Besides fixing a couple of bugs and speeding up the code a little bit, I’ve also added one more mode of operation. Together with the “normal” mode, that is to intersect the brush mask with the other masks, there is now also an “add/overlay” mode, which lets you use the brush mask to retouch the other masks, essentially a poor man’s version of what you might do using brushes in a pixel editor.
Here’s a quick demo, I hope it will clarify what I mean: