Where can I find source code for various components of reference image?

[petrb]

ubuntu image here - https://dn.odroid.com/RK3326/ODROID-GO- ... 223.img.xz contains some binaries that allow showing message boxes as well as request input from user using some overlay keyboard (osk).

Where is the source code for these binaries? I'd like to implement my own terminal interface with overlay keyboard so I that I could jump to linux terminal in case I needed to execute some simple tasks without USB keyboard and I would like to use that source code to implement it. (maybe someone already made that? IDK)

[crashoverride]

Where is the source code for these binaries?

The source code for those components is not public. I am the author and copyright holder of them. The source was withheld due to flood of clone makers that take but do not give back.

[petrb]

ok is there any other source code, maybe just a basic example of how you can process input from the keyboard or draw anything to the display? Basic example like drawing rectangles, or reading joysticks and checking for button press would be enough.

Thanks

[mad_ady]

You may be able to use sdl to process input and draw. There might be open-source keyboard examples implemented in sdl....

[petrb]

hello, what is "sdl" and where do I find it?

[mad_ady]

SDL2 is a library to draw graphics and handle input. https://github.com/xyproto/sdl2-examples
There's a slightly modified version running on the odroid go that uses hardware acceleration where possible.
There seems to be an onscreen keyboard in sdl for Android - that might help you get started: https://wiki.postmarketos.org/wiki/Osk-sdl

Edit: or this: https://github.com/zrafa/onscreenkeyboard

[petrb]

ok, would be also possible to just run whole X11 server with the odroid display? I also have some C++/Qt apps that I might want to be able to run, but they require X11 server

[crashoverride]

would be also possible to just run whole X11 server with the odroid display?

Yes. This topic has more details:
viewtopic.php?p=325192

[mad_ady]

If you're going to use x11 you might as well use an existing on-screen keyboard for x11.