Capture initial screenshot when starting frame timing trace#55720
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Capture initial screenshot when starting frame timing trace#55720rubennorte wants to merge 1 commit intofacebook:mainfrom
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Summary: Changelog: [internal] When tracing starts, the frame metrics listener only fires when new frames are rendered. This means if no UI changes occur during a trace, no screenshots are captured. This also causes the initial state of the UI to be missing from the trace. This change captures an initial screenshot immediately when `start()` is called, ensuring there's always at least one frame recorded at the beginning of a trace regardless of whether UI changes occur. The implementation also refactors the frame emission logic into a shared `emitFrameTiming()` method to eliminate code duplication between the frame metrics listener and the initial capture. Differential Revision: D94223073
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zoontek
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Mar 9, 2026
…#55720) Summary: Pull Request resolved: facebook#55720 Changelog: [internal] When tracing starts, the frame metrics listener only fires when new frames are rendered. This means if no UI changes occur during a trace, no screenshots are captured. This also causes the initial state of the UI to be missing from the trace. This change captures an initial screenshot immediately when `start()` is called, ensuring there's always at least one frame recorded at the beginning of a trace regardless of whether UI changes occur. The implementation also refactors the frame emission logic into a shared `emitFrameTiming()` method to eliminate code duplication between the frame metrics listener and the initial capture. Reviewed By: huntie Differential Revision: D94223073 fbshipit-source-id: b84edae7caa15e24b437ef151e9a6c42916817d3
huntie
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Mar 31, 2026
…#55720) Summary: Pull Request resolved: facebook#55720 Changelog: [internal] When tracing starts, the frame metrics listener only fires when new frames are rendered. This means if no UI changes occur during a trace, no screenshots are captured. This also causes the initial state of the UI to be missing from the trace. This change captures an initial screenshot immediately when `start()` is called, ensuring there's always at least one frame recorded at the beginning of a trace regardless of whether UI changes occur. The implementation also refactors the frame emission logic into a shared `emitFrameTiming()` method to eliminate code duplication between the frame metrics listener and the initial capture. Reviewed By: huntie Differential Revision: D94223073 fbshipit-source-id: b84edae7caa15e24b437ef151e9a6c42916817d3
huntie
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Apr 8, 2026
Backports some CDP Performance features and stability improvements to `0.83-stable`. This includes: - Remaining implementation of Frame Timings and screenshot capture in performance traces (Android) - New support for Frame Timings and screenshot capture on iOS - Optimisations to trace chunk generation, memory usage during performance recording - `Page.captureScreenshot` (Android, iOS) All features remain gated behind feature flags (`fuseboxFrameRecordingEnabled`, `fuseboxScreenshotCaptureEnabled`). **Commits applied** - Define TracingCategory enum (facebook#54377) bd6c6bf - Use TracingCategory in TraceEvent (facebook#54378) ce60f27 - Simple parser for serialized tracing categories (facebook#54379) 62275b6 - Propagate tracing categories to recording state (facebook#54380) 3841ef0 - Re-land "Revert D85999774: [rn][android] Add FrameTiming module" (facebook#54502) 85905ad - Add screenshot category (facebook#54537) 5d9cb80 - Define HostTargetTracingDelegate (facebook#54622) be0dae0 - Define TracingDelegate for Android Host (facebook#54628) a212e95 - Use new API for tracing state on Android (facebook#54629) 532d0be - Internalize TracingState interface (facebook#54631) 58ec261 - Move TracingState interfaces to inspector package (facebook#54632) 10d0d99 - Rename values of TracingState enum (facebook#54630) be94707 - FrameTiming module to subscribe to Inspector tracing lifecycle (facebook#54633) 04ee02b - Clarify HostTracingProfile and HostTraceRecordingState (facebook#54677) ec92f12 - Introduce TimeWindowedBuffer (facebook#54679) d6ee54f - Keep tracing time window on TraceRecordingState (facebook#54673) e651563 - Define FrameTimingSequence (facebook#54674) 5b7d92f - Define an endpoint on HostTarget to capture frame timings (facebook#54672) f469aa3 - Extract frame trace events construction logic (facebook#54675) 57973fa - Define serializers for frame timings as part of HostTargetTracingProfile (facebook#54681) 587d360 - Propagate Frames data through Host (facebook#54671) 26ff069 - Cleanup no longer used jni layer for frame timings (facebook#54678) 9ba4ce6 - Fix screenshot typo (facebook#54742) 52186a3 - Add optional screenshot argument to FrameTimingSequence (facebook#54743) 57c29fc - Frame screenshot event generation (facebook#54744) b447d26 - Frame screenshots capture implementation (facebook#54745) f3c9a8d - BeginDrawing: INTENDED_VSYNC_TIMESTAMP -> VSYNC_TIMESTAMP (facebook#54765) 9221772 - Add frames category (facebook#54768) 31a0c9a - Specify correct category for SetLayerTreeId event (facebook#54769) cd055e9 - Reduce the screenshots size (facebook#54800) e4a5a56 - Remove Commit from FrameTimingSequence (facebook#54779) 39f7703 - Fix potential bitmap leaks in FrameTimingsObserver (facebook#55652) 3918dd1 - Capture initial screenshot when starting frame timing trace (facebook#55720) 863f5c0 - Refactor FrameTimingsObserver for multi-activity support (facebook#55740) 8230f3b - Reorder FrameTimingsObserver methods (facebook#55743) f56b295 - Increase frame capture quality, apply scaling after DPI normalization (facebook#55731) e5f9f5f - Fix FrameTimingsObverver to initiate PixelCopy on main thread (facebook#55744) d552f2a - Fix bitmap reuse race condition in FrameTimingsObserver (facebook#55745) 3924768 - Fix trailing frame capture after recording ended (facebook#55704) 47684ca - Move base64Encode into react/utils (facebook#55873) 422770d - Move screenshot Base64 encoding to trace serialization (facebook#55803) dc4c36e - Restore inspector addPage listener callback (facebook#55925) 8c763fc - Add tracing helper functions for RNDT traces in C++ and Kotlin (facebook#55935) 4f3f536 - Introduce fuseboxFrameRecordingEnabled flag, gate existing code (facebook#55941) 1aa7a32 - Implement Performance frames and screenshots on iOS (facebook#56015) 64a1a10 - Add pixel diffing to RCTFrameTimingsObserver (facebook#56043) 9d231af - Add dynamic sampling to frame screenshots (facebook#56048) d309cda - Switch trace event chunks from event count to size based (facebook#56080) d3b33f5 - Increase trace screenshot scale factor to 1x (facebook#56079) 972a30d - Add Page.captureScreenshot CDP support (facebook#56307) 77332d2 - Fix data race on PerformanceObserver entry buffer (facebook#56352) 5eb1ca1 - [LOCAL] Remove stale frame event code from PerformanceTracer - [LOCAL] Update Podfile.lock
huntie
pushed a commit
to huntie/react-native
that referenced
this pull request
Apr 8, 2026
Backports some CDP Performance features and stability improvements to `0.83-stable`. This includes: - Remaining implementation of Frame Timings and screenshot capture in performance traces (Android) - New support for Frame Timings and screenshot capture on iOS - Optimisations to trace chunk generation, memory usage during performance recording - `Page.captureScreenshot` (Android, iOS) All features remain gated behind feature flags (`fuseboxFrameRecordingEnabled`, `fuseboxScreenshotCaptureEnabled`). **Commits applied** - Define TracingCategory enum (facebook#54377) bd6c6bf - Use TracingCategory in TraceEvent (facebook#54378) ce60f27 - Simple parser for serialized tracing categories (facebook#54379) 62275b6 - Propagate tracing categories to recording state (facebook#54380) 3841ef0 - Re-land "Revert D85999774: [rn][android] Add FrameTiming module" (facebook#54502) 85905ad - Add screenshot category (facebook#54537) 5d9cb80 - Define HostTargetTracingDelegate (facebook#54622) be0dae0 - Define TracingDelegate for Android Host (facebook#54628) a212e95 - Use new API for tracing state on Android (facebook#54629) 532d0be - Internalize TracingState interface (facebook#54631) 58ec261 - Move TracingState interfaces to inspector package (facebook#54632) 10d0d99 - Rename values of TracingState enum (facebook#54630) be94707 - FrameTiming module to subscribe to Inspector tracing lifecycle (facebook#54633) 04ee02b - Clarify HostTracingProfile and HostTraceRecordingState (facebook#54677) ec92f12 - Introduce TimeWindowedBuffer (facebook#54679) d6ee54f - Keep tracing time window on TraceRecordingState (facebook#54673) e651563 - Define FrameTimingSequence (facebook#54674) 5b7d92f - Define an endpoint on HostTarget to capture frame timings (facebook#54672) f469aa3 - Extract frame trace events construction logic (facebook#54675) 57973fa - Define serializers for frame timings as part of HostTargetTracingProfile (facebook#54681) 587d360 - Propagate Frames data through Host (facebook#54671) 26ff069 - Cleanup no longer used jni layer for frame timings (facebook#54678) 9ba4ce6 - Fix screenshot typo (facebook#54742) 52186a3 - Add optional screenshot argument to FrameTimingSequence (facebook#54743) 57c29fc - Frame screenshot event generation (facebook#54744) b447d26 - Frame screenshots capture implementation (facebook#54745) f3c9a8d - BeginDrawing: INTENDED_VSYNC_TIMESTAMP -> VSYNC_TIMESTAMP (facebook#54765) 9221772 - Add frames category (facebook#54768) 31a0c9a - Specify correct category for SetLayerTreeId event (facebook#54769) cd055e9 - Reduce the screenshots size (facebook#54800) e4a5a56 - Remove Commit from FrameTimingSequence (facebook#54779) 39f7703 - Fix potential bitmap leaks in FrameTimingsObserver (facebook#55652) 3918dd1 - Capture initial screenshot when starting frame timing trace (facebook#55720) 863f5c0 - Refactor FrameTimingsObserver for multi-activity support (facebook#55740) 8230f3b - Reorder FrameTimingsObserver methods (facebook#55743) f56b295 - Increase frame capture quality, apply scaling after DPI normalization (facebook#55731) e5f9f5f - Fix FrameTimingsObverver to initiate PixelCopy on main thread (facebook#55744) d552f2a - Fix bitmap reuse race condition in FrameTimingsObserver (facebook#55745) 3924768 - Fix trailing frame capture after recording ended (facebook#55704) 47684ca - Move base64Encode into react/utils (facebook#55873) 422770d - Move screenshot Base64 encoding to trace serialization (facebook#55803) dc4c36e - Restore inspector addPage listener callback (facebook#55925) 8c763fc - Add tracing helper functions for RNDT traces in C++ and Kotlin (facebook#55935) 4f3f536 - Introduce fuseboxFrameRecordingEnabled flag, gate existing code (facebook#55941) 1aa7a32 - Implement Performance frames and screenshots on iOS (facebook#56015) 64a1a10 - Add pixel diffing to RCTFrameTimingsObserver (facebook#56043) 9d231af - Add dynamic sampling to frame screenshots (facebook#56048) d309cda - Switch trace event chunks from event count to size based (facebook#56080) d3b33f5 - Increase trace screenshot scale factor to 1x (facebook#56079) 972a30d - Add Page.captureScreenshot CDP support (facebook#56307) 77332d2 - Fix data race on PerformanceObserver entry buffer (facebook#56352) 5eb1ca1 - [LOCAL] Remove stale frame event code from PerformanceTracer - [LOCAL] Update Podfile.lock
huntie
added a commit
to huntie/react-native
that referenced
this pull request
Apr 9, 2026
Backports some CDP Performance features and stability improvements to `0.83-stable`. This includes: - Remaining implementation of Frame Timings and screenshot capture in performance traces (Android) - New support for Frame Timings and screenshot capture on iOS - Optimisations to trace chunk generation, memory usage during performance recording - `Page.captureScreenshot` (Android, iOS) All features remain gated behind feature flags (`fuseboxFrameRecordingEnabled`, `fuseboxScreenshotCaptureEnabled`). **Commits applied** - Define TracingCategory enum (facebook#54377) bd6c6bf - Use TracingCategory in TraceEvent (facebook#54378) ce60f27 - Simple parser for serialized tracing categories (facebook#54379) 62275b6 - Propagate tracing categories to recording state (facebook#54380) 3841ef0 - Re-land "Revert D85999774: [rn][android] Add FrameTiming module" (facebook#54502) 85905ad - Add screenshot category (facebook#54537) 5d9cb80 - Define HostTargetTracingDelegate (facebook#54622) be0dae0 - Define TracingDelegate for Android Host (facebook#54628) a212e95 - Use new API for tracing state on Android (facebook#54629) 532d0be - Internalize TracingState interface (facebook#54631) 58ec261 - Move TracingState interfaces to inspector package (facebook#54632) 10d0d99 - Rename values of TracingState enum (facebook#54630) be94707 - FrameTiming module to subscribe to Inspector tracing lifecycle (facebook#54633) 04ee02b - Clarify HostTracingProfile and HostTraceRecordingState (facebook#54677) ec92f12 - Introduce TimeWindowedBuffer (facebook#54679) d6ee54f - Keep tracing time window on TraceRecordingState (facebook#54673) e651563 - Define FrameTimingSequence (facebook#54674) 5b7d92f - Define an endpoint on HostTarget to capture frame timings (facebook#54672) f469aa3 - Extract frame trace events construction logic (facebook#54675) 57973fa - Define serializers for frame timings as part of HostTargetTracingProfile (facebook#54681) 587d360 - Propagate Frames data through Host (facebook#54671) 26ff069 - Cleanup no longer used jni layer for frame timings (facebook#54678) 9ba4ce6 - Fix screenshot typo (facebook#54742) 52186a3 - Add optional screenshot argument to FrameTimingSequence (facebook#54743) 57c29fc - Frame screenshot event generation (facebook#54744) b447d26 - Frame screenshots capture implementation (facebook#54745) f3c9a8d - BeginDrawing: INTENDED_VSYNC_TIMESTAMP -> VSYNC_TIMESTAMP (facebook#54765) 9221772 - Add frames category (facebook#54768) 31a0c9a - Specify correct category for SetLayerTreeId event (facebook#54769) cd055e9 - Reduce the screenshots size (facebook#54800) e4a5a56 - Remove Commit from FrameTimingSequence (facebook#54779) 39f7703 - Fix potential bitmap leaks in FrameTimingsObserver (facebook#55652) 3918dd1 - Capture initial screenshot when starting frame timing trace (facebook#55720) 863f5c0 - Refactor FrameTimingsObserver for multi-activity support (facebook#55740) 8230f3b - Reorder FrameTimingsObserver methods (facebook#55743) f56b295 - Increase frame capture quality, apply scaling after DPI normalization (facebook#55731) e5f9f5f - Fix FrameTimingsObverver to initiate PixelCopy on main thread (facebook#55744) d552f2a - Fix bitmap reuse race condition in FrameTimingsObserver (facebook#55745) 3924768 - Fix trailing frame capture after recording ended (facebook#55704) 47684ca - Move base64Encode into react/utils (facebook#55873) 422770d - Move screenshot Base64 encoding to trace serialization (facebook#55803) dc4c36e - Restore inspector addPage listener callback (facebook#55925) 8c763fc - Add tracing helper functions for RNDT traces in C++ and Kotlin (facebook#55935) 4f3f536 - Introduce fuseboxFrameRecordingEnabled flag, gate existing code (facebook#55941) 1aa7a32 - Implement Performance frames and screenshots on iOS (facebook#56015) 64a1a10 - Add pixel diffing to RCTFrameTimingsObserver (facebook#56043) 9d231af - Add dynamic sampling to frame screenshots (facebook#56048) d309cda - Switch trace event chunks from event count to size based (facebook#56080) d3b33f5 - Increase trace screenshot scale factor to 1x (facebook#56079) 972a30d - Add Page.captureScreenshot CDP support (facebook#56307) 77332d2 - Fix data race on PerformanceObserver entry buffer (facebook#56352) 5eb1ca1 - Add dynamic sampling to frame screenshots (facebook#56135) e0d1e29 - Increase trace screenshot scale factor to 1x (facebook#56136) 90e02fa - Add missing debugger define for React-RuntimeApple (facebook#56397) - [LOCAL] Remove stale frame event code from PerformanceTracer - [LOCAL] Update Podfile.lock
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Summary:
Changelog: [internal]
When tracing starts, the frame metrics listener only fires when new frames are rendered. This means if no UI changes occur during a trace, no screenshots are captured. This also causes the initial state of the UI to be missing from the trace.
This change captures an initial screenshot immediately when
start()is called, ensuring there's always at least one frame recorded at the beginning of a trace regardless of whether UI changes occur.The implementation also refactors the frame emission logic into a shared
emitFrameTiming()method to eliminate code duplication between the frame metrics listener and the initial capture.Differential Revision: D94223073