fix(webcam): ask the machine whether it can segment, instead of guessing - #541
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Three separate ways the camera-background feature could be silently absent, and they turn out to be one bug: nothing ever asked whether a mask could be produced. - **Intel Macs.** Upstream publishes no ONNX Runtime binary for osx-x64, so `runtime_available()` is false there forever. The control was shown anyway. - **Nothing reached the renderer.** `runtime_available()` existed in Rust and stopped there. The compositor logged one line and left `fx.z` at 0; the user clicked Blur, the setting persisted, the button highlighted, the slider appeared — and the camera was untouched in the preview and in the export. - **`before-pack` did not require the library.** A build that skipped staging, or hit a network blip in a job that continued, passed the payload guard and shipped an installer whose control does nothing. `segmentation_runtime_available()` on the addon, composed with the model lookup in `compositorViewService.probeSegmentation()`, gives a four-state answer: `ready` / `no-runtime` / `no-model` / `none`. It rides the `probeBackend` chain exactly — N-API, addon.d.ts, service, IPC, contracts, client — and `useSegmentationSupport` mirrors `useCompositorBackend`, memoised once per session, failing closed on every non-`ready` answer including "still probing". Asked rather than guessed, because the guess was wrong in both directions: the old `process.platform` gate hid the control on Linux builds that could segment and showed it on Intel Macs that never can. Platform is not capability — a dev checkout and a `--dir` build have no runtime staged either, and neither is distinguishable from `darwin` or `win32`. `before-pack` now names the library in all three payload lists, with no entry on Intel macOS since a package without it is correct there. This is the guard whose own header says a mac package built without the compositor addon "shipped silently"; the same hole was open for this one. Verified: 2208 JS tests (7 new on the hook, three of which fail when the fail-closed rule is mutated away), 146 Rust, tsc clean, before-pack loads.
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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: Pro Plus Run ID: 📒 Files selected for processing (2)
🚧 Files skipped from review as they are similar to previous changes (2)
Included review availability: Your plan provides up to 8 included reviews per hour; 5 remain after this review. 📝 WalkthroughWalkthroughThe PR adds native segmentation capability probing, bridge contracts, cached renderer hooks, ONNX Runtime packaging checks, and conditional rendering for camera-background controls. ChangesSegmentation support
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to The change makes camera-background controls depend on actual segmentation capability and strengthens packaging checks. No actionable merge-blocking risk remains after normal checks. Sequence Diagram(s)sequenceDiagram
participant LayoutPane
participant useCanSegmentCamera
participant probeSegmentationSupport
participant NativeBridge
participant CompositorViewService
participant CompositorViewAddon
LayoutPane->>useCanSegmentCamera: Request segmentation capability
useCanSegmentCamera->>probeSegmentationSupport: Probe once per session
probeSegmentationSupport->>NativeBridge: Send probeSegmentation
NativeBridge->>CompositorViewService: Call probeSegmentation()
CompositorViewService->>CompositorViewAddon: Check segmentationRuntimeAvailable()
CompositorViewService-->>NativeBridge: Return support status
NativeBridge-->>probeSegmentationSupport: Return SegmentationSupport
probeSegmentationSupport-->>useCanSegmentCamera: Return ready or unsupported
useCanSegmentCamera-->>LayoutPane: Enable or hide camera controls
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Description checkExplanation The description gives a detailed summary, implementation flow, behavior, packaging impact, and testing results. It does not use the repository template headings or provide issue, release-impact, desktop-impact, and screenshot sections, but the content is substantially complete and directly related to the change.
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Inline comments:
In `@scripts/before-pack.cjs`:
- Line 80: Update the MAC_REQUIRED validation in checkMacNativePayload so
libonnxruntime.dylib is required only for darwin-arm64, while preserving the
existing validation for other required libraries and architectures.
In `@src/native/contracts.ts`:
- Around line 137-140: Update the `"none"` contract documentation near the
native capability result definitions to include cases where an addon is present
but unusable or stale, including older addons lacking
segmentationRuntimeAvailable(). Keep the existing pure-web/dev meaning while
aligning the definition with compositorViewService’s producer behavior.
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📒 Files selected for processing (10)
crates/compositor-view-napi/src/lib.rselectron/ipc/nativeBridge.tselectron/native-bridge/services/compositorViewService.tselectron/native/compositor-view/addon.d.tsscripts/before-pack.cjssrc/components/ai-edition/RightPanes.tsxsrc/native/compositorViewClient.tssrc/native/contracts.tssrc/native/hooks/useSegmentationSupport.test.tssrc/native/hooks/useSegmentationSupport.ts
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The comment said "no entry on x64" and the code added one anyway, for every macOS arch. Upstream publishes no ONNX Runtime binary for Intel Macs — `fetch-onnxruntime.mjs` says so and exits 0 without staging anything — so a clean x64 payload would have failed at pack time. The guard would have turned against exactly what it protects. Split into `MAC_ONNX_REQUIRED` and applied only on arm64, so the comment and the code now say the same thing. Also aligns the `SegmentationSupport` doc with its producer: `"none"` is also what the service returns when an addon is present but too old to answer the probe, not only when none loaded at all. Consumers were told it meant one thing and could get the other. Both caught in review.
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Three ways the camera-background feature could be silently absent. They turn out to be one bug: nothing ever asked whether a mask could be produced.
osx-x64, soruntime_available()is false there forever. The control was shown anyway.runtime_available()existed in Rust and stopped there. The user clicked Blur, the setting persisted, the button highlighted, the slider appeared — and the camera was untouched, in the preview and in the exported file.before-packdid not require the libraryThe fix
segmentation_runtime_available()on the addon, composed with the model lookup incompositorViewService.probeSegmentation(), gives a four-state answer:ready/no-runtime/no-model/none.It rides the
probeBackendchain exactly — N-API →addon.d.ts→ service → IPC → contracts → client — anduseSegmentationSupportmirrorsuseCompositorBackend: memoised once per session, failing closed on every non-readyanswer, including "still probing".Asked rather than guessed, because the guess was wrong in both directions. The old
process.platformgate hid the control on Linux builds that could segment, and showed it on Intel Macs that never can. Platform is not capability: a dev checkout and a--dirbuild have no runtime staged either, and neither is distinguishable fromdarwinorwin32.before-packnow names the library in all three payload lists — with no entry on Intel macOS, since a package without it is correct there. That guard's own header records that a mac package built without the compositor addon "shipped silently"; the same hole was open for this one.Verification
2208 JS tests, 146 Rust,
tscclean,before-pack.cjsloads. Seven new tests on the hook; three of them fail when the fail-closed rule is mutated away (=== "ready"→!== "none").The one thing not covered: no test asserts the native probe returns false without the library, because that needs a machine without it. The Rust side is a one-line delegation to
runtime_available(), which is itself guarded and cfg-tested.🤖 Generated with Claude Code
Summary by CodeRabbit
New Features
Bug Fixes
Tests