> Qt
That's EGLFS, it's used quite a bit in automotive AFAIK. It's slowly getting replaced by Wayland and Weston though.
Qt also has a directfb backend (among many others: https://github.com/qt/qtbase/tree/dev/src/plugins/platforms)
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Qt also has a directfb backend (among many others: https://github.com/qt/qtbase/tree/dev/src/plugins/platforms)