It's very difficult, and is the reason I haven't made layer masking a thing, though I had thought of it and other blend modes some time ago. 1) I need to draw to an intermediate surface and lockbits and define my own copy mechanism to have blend modes and such, like doing alpha -= value to erase. 2) I was reluctant to bother since I have no stylus or touchscreen, but I can try when I rewrite the app.   I plan to rewrite this all in WPF and Direct2D some day, and actually take
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