Is there any way to apply or have custom frames (images) around specific X windows?
For example, in xfwm4 and fvwm (window managers) it's possible to have a specific window decoration for a window with different images, one at the bottom, other at the top, etc. examples:
Obviously if it was that easy, I'd just use either of them, however, I do think that a singular program could handle it instead of needing to change the whole window manager.
I'm currently using dwm and there are ways to change the colour and thickness of border, and that's it. If I was better at C I could create a rule to draw images around specific X windows with specific WM_CLASS, but that's too much for me now, so any help is really appreciated.
An alternative solution would be to draw a single image (from a file) bigger than the X window behind it and make it to follow the X window position, and maybe the size as well (that's harder, so it's not really that necessary)
I started writing a C++ program to do that, but that may take too much time since C++ still a new tool to me and looking at how xfwm4 handles this.