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Alright, getting somewhere! I think I've figured out a good code structure for the xray blur. It now correctly works even inside offscreens (opening animation, and when you drag a window targeting the tiling layout), and it should also work properly with the upcoming screen magnifier (that we have in pull requests).
Still not a single blur re-render in this entire video!
So yeah, I'm working on blur for niri. I'm doing "xray blur" first where the idea is that you only include background surfaces, so you pretty much never have to redo the blur—next to zero perf impact unless you have a video wallpaper or smth.
Turns out that it's quite tricky to do well, especially with our Overview. I'm like on my third refactor attempt now but I think I've got a good approach.
During this video there's no reblurring whatsoever, all just drawing cached static textures.
working on my new visual style
Also added niri msg action stop-cast to force-stop a PipeWire screencast
The screencast IPC is now merged: https://yalter.github.io/niri/niri_ipc/struct.Cast.html
Oh right, for PipeWire I can send the node ID, which DMS can then use to fetch the consumer application name!
Working on a screencast IPC for niri. The idea is to give info to desktop bars to be able to add a screencast indicator whenever something is recording the screen.
Got it hooked up for both PipeWire (obviously) and wlr-screencopy. For the latter there's no good way to tell if something is a screencast so I went with some heuristics.
Here's the icon working on the DMS bar, as well as a popup with the full available info I made for debugging. 
Merged another long time overdue niri PR: mouse cursor via metadata in PipeWire screencasts (lets you toggle Show Cursor on/off in OBS), and full mouse cursor support in window casts.
The cursor is visible only when the window is receiving mouse events—if you're moving the mouse on top of something else covering the target window, the cursor won't be (unintentionally) painted.
Thanks @abmantis for driving this, including debugging a memory bug in PW!
niri can now include the mouse pointer on window screenshots, a feature that had several more edge cases than I thought before starting to work on it (and it's likely not the ones you think, those ones were easy)
Turns out GNOME Shell has the same problem: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/6565
I also wrote it down in a more detailed form on the niri issues for future reference: https://github.com/YaLTeR/niri/issues/3201
Is there any good way of moving a process into a systemd StartTransientScope together with its children?
In niri we put spawned processes into scopes, so oomd and other stuff can work properly. Usually you do it by putting yourself into a scope, then exec-ing the target program. But that's a 7 ms toll on startup time, so in niri we spawn the program right away, and then put it into a scope. However, if the program forks fast enough, that child doesn't go into the scope..
Looking for ideas on how to go about translating niri (the binary, and the wiki). If you have experience doing this with other FOSS projects, please share:
i'm reviving the PR integrating Tracy GPU profiling into Smithay. Here are two test captures from niri: one for normal + screencast rendering, one for iGPU + dGPU monitor rendering
biblically accurate window management
Finished the push-based rendering refactor, made a write-up here for the curious: https://github.com/YaLTeR/niri/pull/3113
It even ended up with a negative delta (+762 -780) which is always a W.
Btw I ran the comparison on my Eee PC and there the difference is even more extreme, like 8x faster rendering list construction (which is once again only a part of the total rendering time, and notably doesn't include actual rendering, but still nice).
Experimenting with a restructure of the niri rendering code to uncurse it somewhat by getting rid of all complex impl Iterator chains and lifetimes, which also lets me remove some intermediate small Vecs. In essence, going from pull to push iteration.
I'm surprised that the result is consistently 2-3x faster than before. Wonder if it's the Vecs, or if inverting (massive) codegen'd iterators into a normal call stack passing a closure arg, providing the main benefit
on niri-git, the nautilus rename popup now works properly with IMEs running
(and generally popups with text fields should work now)
i added the pointer warping thing from blender to when you drag the view around in niri with the mouse
hf with this new way to pass time during boring meetings
(on a more serious note this helps when you need to scroll further than the edge of your monitor allows)
also unrelated: merged optional config includes earlier today
yuxqiu just improved the default GPU detection logic in Smithay, so niri-git now works out of the box on Asahi and Pinephone devices, without having to manually configure render-drm-device!