Is this possible to use Latest GTK Widget(GTK 4) toolkit for Directfb Graphics backend(Non X11 Window Systems)? Is this support all widgets as like X11 window system?
No. Only GTK2 had a DirectFB backend, which was removed in GTK3 10 years ago because it was not maintained and was known to be broken.
DirectFB is a dead project, as these days Linux has kernel mode setting and direct access to frame buffers. I recommend you use something like Weston, the reference Wayland compositor, and the Wayland backend for GTK. Alternatively, you could use the Broadway backend of GTK, and use a web browser to display and interact with a GTK application.
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