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Add camera scan support for all Blazor modes in BbScanner (#14328) - #14329
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Walkthrough
BbScanner now supports camera scanning across interactive WebAssembly, Server, Auto, and Hybrid render modes. The change adds separate interop bridges, remote frame and image transfer, Hybrid camera permissions, updated hosting guidance, and component and end-to-end tests.
Changes
Cross-renderer scanner
Layer / File(s)
Summary
Interop bridges and browser data transfer src/Utilities/BbScanner/Bit.BbScanner/Interop/*, src/Utilities/BbScanner/Bit.BbScanner/Scripts/bit-bbscanner.ts, src/Utilities/BbScanner/Bit.BbScanner/Components/BbScanner.razor
The new bridge selects WebAssembly or IJSRuntime interop. The JavaScript module adds watchdog polling, sliced luminance and image transfer, capability reporting, and page-side file-picker handling.
Interactive scanner and camera lifecycle src/Utilities/BbScanner/Bit.BbScanner/Components/BbScanner.razor.cs
The component uses the bridge for interactive activation, camera permissions and controls, camera lifecycle, and disposal.
Remote frame polling and region decoding src/Utilities/BbScanner/Bit.BbScanner/Components/BbScanner.razor.cs, src/Utilities/BbScanner/Bit.BbScanner/Pipeline/BbBarcodeDecoder.cs, src/Utilities/BbScanner/Tests/Bit.BbScanner.Tests/Components/BbScannerRemoteTests.cs
Remote frames transfer searched-region luminance for decoding. The decoder validates cutouts and maps results to full-frame coordinates; component tests cover transfer, decoding, and recovery cases.
Image scanning and picker flows src/Utilities/BbScanner/Bit.BbScanner/Components/BbScanner.razor.cs, src/Utilities/BbScanner/Bit.BbScanner/Components/BbScanner.razor, src/Utilities/BbScanner/Samples/Core/Pages/ImagePage.razor
Encoded images and picker-selected files use bridge-based preparation and pixel reads. The picker button opens the file picker from the page click handler.
Hybrid platform camera access src/Utilities/BbScanner/Samples/Maui/MainPage.xaml.cs, src/Utilities/BbScanner/Samples/Maui/Platforms/*
The MAUI sample declares camera access for Android, iOS, Mac Catalyst, and Windows. Android WebView video capture is granted only after the app camera permission is granted.
Hosting guidance and sample descriptions src/Utilities/BbScanner/Bit.BbScanner/README.md, src/Utilities/BbScanner/README.md, src/Utilities/BbScanner/Demo/*, src/Utilities/BbScanner/Samples/*
The documentation and sample descriptions cover hosting-mode setup, frame-transfer paths, camera permissions, and Server circuit behavior. Package tags now include Blazor Server, Blazor Hybrid, and MAUI.
Component and Server end-to-end coverage .github/workflows/bit.ci.BbScanner.e2e.yml, src/Utilities/BbScanner/Tests/*
The workflow builds the Blazor Server sample. Test infrastructure can start or reuse that sample, and new tests cover remote interop and Server camera, lifecycle, picker, and upload flows.
sequenceDiagram
participant BbScanner
participant BbScannerJsRuntimeBridge
participant BrowserPage
participant BbBarcodeDecoder
BbScanner->>BbScannerJsRuntimeBridge: Poll and request a searched-region frame
BbScannerJsRuntimeBridge->>BrowserPage: Capture and read luminance in slices
BrowserPage-->>BbScannerJsRuntimeBridge: Return frame data
BbScannerJsRuntimeBridge-->>BbScanner: Return luminance region
BbScanner->>BbBarcodeDecoder: Decode region and map frame coordinates
LoadingMerge Risk: Low · previous review 14ff3
Camera scanning now works across all Blazor modes. A few edge cases are worth fixing before or soon after merge. A reconnect during camera start can leave the Server scanner idle until restart. A failed image upload can leave encoded bytes in the page. The Android sample can crash if a permission call throws. The privacy documentation also overstates how thoroughly image data is cleared.
Pre-merge checks: 4 · 1
Failed checks: 1 warning
Check name
Status
Explanation
Resolution
Docstring Coverage
Docstring coverage is 41.31% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Documentation-only edits and deletions within surv…
Write docstrings for the functions missing them to satisfy the coverage threshold.
Passed checks: 4 passed
Check name
Status
Explanation
Description Check
Check skipped - CodeRabbit’s high-level summary is enabled.
Title check
The title "Add camera scan support for all Blazor modes in BbScanner (#14328)" matches the main change. The raw summary shows BbScanner camera scanning extended from Blazor WebAssembly to Server, Auto…
Linked Issues check
Issue #14328 requires camera scanning beyond Blazor WebAssembly, including the camera-input features. The PR adds BbScannerJsRuntimeBridge for Server and Hybrid interop, keeps the WebAssembly bridge…
Out of Scope Changes check
The changes remain connected to issue #14328. Bridge code, JavaScript changes, decoder changes, sample permissions, hosting guidance, package metadata, build workflow changes, and automated tests supp…
Full details: Title check
Explanation
The title "Add camera scan support for all Blazor modes in BbScanner (#14328)" matches the main change. The raw summary shows BbScanner camera scanning extended from Blazor WebAssembly to Server, Auto, and Hybrid render modes, with a new bridge abstraction, server-side luminance transfer, updated docs, samples, and E2E tests. The linked objectives request the same scope. The title is short, specific, and in a single sentence. The issue number in the title refers to the linked issue, not the PR number, which is a minor point and does not affect relevance.
Full details: Linked Issues check
Explanation
Issue #14328 requires camera scanning beyond Blazor WebAssembly, including the camera-input features. The PR adds BbScannerJsRuntimeBridge for Server and Hybrid interop, keeps the WebAssembly bridge, and updates BbScanner for interactive Server, WebAssembly, Auto, and Hybrid renderers. The implementation covers camera sessions, frame transfer, image scanning, permissions, cleanup, and prerender handling. ScannerServerTests and BbScannerRemoteTests cover Server and non-WebAssembly camera, frame, image, picker, cleanup, and error behavior. The documentation and sample changes describe the supported modes and required permissions.
Full details: Out of Scope Changes check
Explanation
The changes remain connected to issue #14328. Bridge code, JavaScript changes, decoder changes, sample permissions, hosting guidance, package metadata, build workflow changes, and automated tests support camera scanning across Blazor modes. The added Server E2E infrastructure and remote component tests validate the requested behavior. No unrelated change is demonstrated by the reviewed summary.
Full details: Docstring Coverage
Explanation
Docstring coverage is 41.31% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 213 functions across 33 files. (22 skipped: 22 unsupported.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
Finishing Touches: 💡 1
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A rabbit watched the camera glow, Then sent neat squares for codes to show. Through circuits, WebViews, frames took flight, While sliced gray pixels crossed just right. The picker clicked; the scans said “go!”
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⚠️Unverified finding
Verification ran but could not confirm this finding. It is shown for review, not as a verified issue.
Keep the custom picker click in the page.
On a Server circuit, the browser can reject the picker click after user activation expires. The button then does nothing and reports no error. Open the picker from a page-side click handler, or disable this button when that is not possible. (webkit.org)
🪄 Fix comments: Fix CodeRabbit comments on this PR
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only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.
Inline comments:
Review comments at
@src/Utilities/BbScanner/Bit.BbScanner/Components/BbScanner.razor.cs:
- Around line 1481-1492: Move the ApplyProcessingSizeAsync call in TickAsync
before the paused/no-frame early return so pending configuration can reach the
page even when PollFrame is unset. Preserve the existing early-return behavior
for pending configuration, paused state, or no frame, and check IsStale(version)
after applying the size as shown in the proposed flow.
Review comments at
@src/Utilities/BbScanner/Bit.BbScanner/Interop/BbScannerJsRuntimeBridge.cs:
- Around line 208-225: Update PrepareImageAsync to catch failures from
ForEachInFlightAsync, call the page’s releasePrepared operation for the same
sessionId and requestId on a best-effort basis, then rethrow the original
failure without letting cleanup errors replace it. Keep prepareStagedParts on
the successful staging path.
Review comments at @src/Utilities/BbScanner/Demo/Client/Pages/Image.razor:
- Line 82: Update the built-in picker comparison in the image upload description
to state that the browser decodes the file and sends prepared luminance to the
server, rather than claiming it sends the encoded file once.
Review comments at @src/Utilities/BbScanner/README.md:
- Line 787: Update the still-image clearing claim in the README to qualify that
it is not fully zeroed on Server and Hybrid: readData creates temporary pixel
slices, and BbScannerJsRuntimeBridge.ReadAsync copies them without clearing.
Keep the claim limited to buffers that are actually cleared.
Review comments at
@src/Utilities/BbScanner/Samples/Maui/Platforms/Android/CameraWebChromeClient.cs:
- Around line 36-52: Wrap the permission checks and request handling inside the
MainThread.BeginInvokeOnMainThread async callback in try/catch, and call
request.Deny() if either permission operation throws. Ensure the callback always
answers the PermissionRequest while preserving the existing grant behavior when
permission is granted.
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closes #14328
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