fix(compositor): high-quality motion blur and gaussian webcam blur - #608
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📝 WalkthroughWalkthroughThe compositor now derives motion-blur intensity and adaptive cursor sampling from frame geometry. Linux, macOS, and Windows apply these values. Metal and WGSL shaders use scaled motion vectors and 21-tap webcam blur sampling. Paused frames recompose during a short settle window. ChangesCompositor quality updates
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to Paused seeks may show a stale webcam segmentation result until another user action triggers rendering. This affects the intended paused-frame blur behavior and should be fixed and regression-tested before merge. Sequence Diagram(s)sequenceDiagram
participant FrameGeometry
participant PlatformCompositor
participant BlurShader
participant LiveRenderThread
FrameGeometry->>PlatformCompositor: Provide mb_amount and cursor plan
PlatformCompositor->>BlurShader: Pass scaled motion-blur constants
BlurShader->>BlurShader: Sample scaled motion and webcam blur paths
LiveRenderThread->>PlatformCompositor: Recompose changed paused frames
PlatformCompositor->>PlatformCompositor: Render during the settle window
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Inline comments:
In `@crates/compositor/src/frame_geometry.rs`:
- Line 1300: Update the trail_dt calculation in plan_cursor to use blur01 / FPS
instead of multiplying by 1.25, keeping the sampled interval limited to one
frame while preserving the existing blur-based behavior.
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crates/compositor/src/compositor_linux.rscrates/compositor/src/compositor_macos.rscrates/compositor/src/compositor_windows.rscrates/compositor/src/cursor.rscrates/compositor/src/frame_geometry.rscrates/compositor/src/shaders.metalcrates/compositor/src/vk_shaders/layer.wgsl
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- Restrict cursor motion blur shutter interval to current frame (<= 1.25/FPS) instead of 8 frames - Add adaptive tap density for cursor motion blur (stationary drops to 1 tap, moving scales clamp(2, 16)) - Add monotonically front-weighted tap weight ramp (cursor_tap_weight) normalized to 1.0, blended per-tap in D3D11, Metal, and Vulkan - Pass mb_amount to shaders and scale general motion blur displacement proportionally backwards from uv_now - Replace 25-tap Cartesian grid webcam background blur with isotropic 21-tap Vogel spiral Gaussian bokeh kernel and IGN rotation - Deduplicate Windows cursor placement by reusing plan_cursor
Use blur01 / FPS instead of multiplying by 1.25 so the exposure interval stays strictly within one frame at 100% blur.
EtienneLescot
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…the next scrub Segmentation is asynchronous: the first compose starts the worker, the second submits the frame, the third uploads the mask. Paused, the render loop recomposed exactly once per change, so the mask never landed — cutout, blur and custom background all stayed inert until a scrub produced the missing composes. Keep recomposing for 500 ms after a paused change, at the segmentation rate rather than the loop's, so the mask arrives on its own.
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Inline comments:
In `@crates/compositor/src/live.rs`:
- Around line 1715-1717: Update the paused-seek handling in the live compositor
so a successful present_frame composition starts or resets settle_until and
updates last_settle, ensuring asynchronous segmentation is applied without
another user action; add a regression test covering this paused scrub path.
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A paused seek goes through `present_frame`, which composes exactly once and skipped the window the previous commit added — so the mask of the PREVIOUS position stayed on screen until some other action caused a compose. Same blind spot as the one that commit fixed, one branch over. Both call sites now go through `open_settle_window`, so a forgotten `last_settle` cannot make the loop recompose at its own rate instead of the segmentation's.
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Summary
Addresses motion blur quality and performance across cursor, camera/screen, and webcam segmentation background blur:
Related issue
Fixes #606
Type of change
Release impact
Desktop impact
Testing
ode scripts/build-windows-compositor-addon.mjs\ (Built native D3D11 release addon).
px tsc --noEmit\ &
px tsc -p tsconfig.test.json --noEmit\ (0 errors).
pm run lint\ &
pm run format\ (0 errors).
pm run i18n:check\ (Passed).
px vitest --run src/native/\ (131 tests passed).
Summary by CodeRabbit
Bug Fixes
Improvements