WAANNNTT!
Thread
I've had this on the back burner for a time but I hope to make time to finish it: a faithful recreation of MacPaint in Swift that uses some modern APIs for quality of life improvements like fullscreen, modern file format import/export, Quicklook support, tabs, etc.
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I believe it was able to import photos using a connected scanner. The result was rendered using the Floyd-Steinberg Dithering methodology. There are a few APIs out there for this kind of image rendering.