I regularly need to generate the
Assets.xcassets folder which contains an
AppIcon.appiconset folder with a
Contents.json and multiple (png) image files. Those files are App icons for iOS.
I'm currently using the Asset Catalog Creator, which has the major downside that I need to run it on iOS. I'm looking for something gratis that runs on linux.
I imagine a command line utility that takes a PNG image as input and produces the output. The background should either be configurable or white. If the input image does not have a 1:1 aspect ratio, the image is centered.