Open source UI framework written in Python, running on Windows, Linux, macOS, Android and iOS
It's not clear exactly what you are asking for, but support for shaped windows was merged back in 2017, it probably covers part of what you want to accomplish ... see the relevant shape_mode, shape_image, shape_cutoff and other related properties in Window documentation
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1 project | reddit.com/r/kivy | 10 Jan 2022
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1 project | reddit.com/r/kivy | 25 Aug 2021