What is gamelist-visual-editor?

GameList Visual Editor fixes an annoying cosmetic problem on Miyoo handheld gaming devices, which run a custom interface called Onion OS. When you install a themed box art pack, such as the popular Done Set 3, the game cover art image is a fixed size and can end up overlapping or hiding the game's title text on the screen. There is no built in setting inside Onion OS to fix this, since the interface that renders it is closed source, so this tool works around the problem from the outside by editing the artwork and font size instead. The tool gives a live preview that updates instantly as you shrink the artwork, adjust its transparency, or resize the game list font, using measurements taken directly from Onion's own theme files rather than guesswork. It supports the different screen sizes used across the Mini, Mini Plus, Flip, and Mini Flip handheld models through a device selector. You can preview against a sample image or one of your own real game covers. Once you are happy with the settings, it can batch process your entire game library at once: point it at your Roms folder and it automatically works through every game system's images inside it. It can also edit your theme's config.json file to change the game list font size, automatically making a backup first so you can restore it if needed. The README is careful to warn that processing images directly into your existing Roms folder, rather than a separate output folder, does not automatically back up those images, so anyone unsure of their settings should test on a separate folder first. You can either download a ready-made Windows executable from the Releases page, or run the Python script yourself if you would rather see and trust the exact code being run. Running from source only needs Python installed, since the graphical interface library it relies on already comes bundled with Python. The project is released into the public domain under the Unlicense, meaning anyone can use it for any purpose without restriction.