Feature Request: Alpha Image Masking

[Tigairius]

I will keep it super short.

I whipped up a quick gif example; I'd like to be able to have some way to accomplish this on Graal in an efficient manner:



I think there is more information here (thanks for the link dusty).

It opens up a lot of possibilities for light effects. Right now we can only draw images on top of each other. I'd like to be able to use alpha-transparent images to "cut into" other images/polygons.