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Innteresting. It seems that the `output` collection is much more reliable as a source of truth about which monitors and screens are actually in use. Each one comes with its own collection of `crtc`, but you can just skip the ones that return `null`, giving you a reliable list of the "active and visible" screens that the user is currently looking at. Excellent! This means that I'm one step closer to having a viable solution! I also discovered the [xcb_util](https://xcb.freedesktop.org/XcbUtil/) library of helpful utilities has a function called `xcb_aux_get_screen` for getting the root screen because everyone was weirded out by that list traversal algorithm. The source code to [xedgewarp](https://github.com/Airblader/xedgewarp) was invaluable in revealing these secrets to me. So far this little toy compiles down to only 35KB, and that includes using `std::cout` and `std::vector`! I wonder how big the Rust version will be. Yeah, yeah, I know, it cheats by having lots of itself hidden in the kernel. Next up: Actually knowing what the rotation status is.
2022-02-24 23:59:43 +00:00
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