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hecate cantus
1a39b7f66c
* feat: parallax-scroll wallpaper Add a `Scrolling` wallpaper fill mode that translates the wallpaper crop with the active workspace — like Android home-screen parallax, but along niri's vertical workspace axis. The image is scaled to cover the screen on its non-scroll axis, and the active workspace index drives a fractional offset into the cropped overflow along the scroll axis. Scroll position is spring-animated CPU-side and handed to a minimal single-texture shader as a UV offset. Per-monitor scroll position is published into SessionData so the lock screen renders the same crop as the active workspace, keeping visual continuity across lock/unlock. Two implementation details worth calling out for review: - QSG_USE_SIMPLE_ANIMATION_DRIVER=1 is exported to the spawned quickshell process. The default animation driver advances in fixed ~16ms steps, capping the scroll at 60Hz and desyncing it from compositor motion on high-refresh displays; the simple driver advances by real elapsed time, restoring native-refresh pacing. Removing it visibly regresses to 60Hz. - The wallpaper survives wl_output rebind cycles (e.g. OLED image-cleaning on DPMS soft-off), which otherwise leave a stuck or void background. Recovery re-anchors the scroll target on output-lifecycle signals, rebuilds the ShaderEffect against the current render context, and re-attaches the wallpaper-layer surface on unlock for parallax-active monitors — guarded against lock state so the shader gets reliable frame hints. * simplify bindings and gate lock screen shader in a loader --------- Co-authored-by: bbedward <bbedward@gmail.com>