fix(compositor): high-quality motion blur and gaussian webcam blur - #608
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fix(compositor): high-quality motion blur and gaussian webcam blur#608EtienneLescot wants to merge 2 commits into
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: defaults Review profile: CHILL Plan: Team Run ID: 📒 Files selected for processing (1)
🚧 Files skipped from review as they are similar to previous changes (1)
Included review availability: Your plan provides up to 8 included reviews per hour; 5 remain after this review. 📝 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. ChangesMotion blur quality changes
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: ⚪ Minimal · up to This change updates compositor motion blur and webcam blur behavior. No concrete merge-blocking risk remains in the supplied current-head evidence. Sequence Diagram(s)sequenceDiagram
participant FrameGeometry
participant PlatformCompositor
participant MotionBlurShader
participant WebcamBlurShader
FrameGeometry->>PlatformCompositor: Provide mb_amount and cursor plan
PlatformCompositor->>MotionBlurShader: Pass scaled motion-blur constants
MotionBlurShader->>MotionBlurShader: Sample backward along scaled displacement
PlatformCompositor->>WebcamBlurShader: Pass local pixel coordinates
WebcamBlurShader->>WebcamBlurShader: Accumulate 21-tap Vogel samples
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✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
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🧪 Generate unit tests (beta)
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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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📒 Files selected for processing (7)
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.
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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