feat: Tile compression - backtracking layers level#137
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abelonogov-ld merged 30 commits intomainfrom Feb 18, 2026
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…ssion * andrey/send-changed-rectangles: sending just rect (+3 squashed commits) Squashed commits: [1a92964] deduplicate images before buffer [80ed3b3] starting tile signature fix concurrency issues remove after buffer image comparisons (+4 squashed commits) Squashed commits: [397779f] ImageSignature [1a92964] deduplicate images before buffer [80ed3b3] starting tile signature # Conflicts: # Sources/LaunchDarklySessionReplay/ScreenCapture/ScreenCaptureService.swift # Sources/LaunchDarklySessionReplay/ScreenCapture/TiledSignatureManager.swift
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Sources/LaunchDarklySessionReplay/ScreenCapture/TileDiffManager.swift
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Sources/LaunchDarklySessionReplay/Exporter/RRWebEventGenerator.swift
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🤖 I have created a release *beep* *boop* --- ## [0.19.0](0.18.2...0.19.0) (2026-02-18) ### Features * Tile compression - backtracking layers level ([#137](#137)) ([56d86da](56d86da)) --- This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please). <!-- CURSOR_SUMMARY --> --- > [!NOTE] > **Low Risk** > Release bookkeeping only (version/changelog updates) with no functional code changes in this diff. > > **Overview** > Publishes **v0.19.0** by bumping the version in release metadata (manifest, podspecs) and updating `sdkVersion`. > > Updates `CHANGELOG.md` with the 0.19.0 release notes, including the *Tile compression - backtracking layers level* feature. > > <sup>Written by [Cursor Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit 9febef4. This will update automatically on new commits. Configure [here](https://cursor.com/dashboard?tab=bugbot).</sup> <!-- /CURSOR_SUMMARY -->
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Implemented tile compression, which divides the screen into multiple tiles and changes from the previous screen being detected. If possible, only a portion of the screen is sent; otherwise, the entire screen is sent. If it’s possible to restore the previous state by removing a layer, the layer is removed.
Added an option
compression: overlayTiles(layers = 10). Thelayersparameter specifies the number of layers that can be stacked on top of each other.Note
Medium Risk
Changes the core capture/compression and RRWeb event-generation paths; bugs could lead to missing/incorrect frames or increased payloads, but the change is scoped to session replay data generation (not auth/security).
Overview
Introduces a configurable session replay compression mode (
SessionReplayOptions.compression) with anoverlayTiles(layers:)strategy that periodically emits keyframes and otherwise sends only the changed screen region.Refactors capture/export to produce
ExportFrame(one or more image tiles + rects, keyframe flag, and optionalImageSignature) via a newCaptureManager+TileDiffManager, and updates the RRWeb pipeline to apply incremental updates using a new.mutationIncrementalSource(MutationDataadd/remove nodes with backtracking) instead of always redrawing a single full-screen canvas.Updates supporting RRWeb encodings (
WindowDatasizing, canvas commands to accept rects), renamesSessionReplayEventGeneratortoRRWebEventGenerator, and adjusts tests and the test app for the new capture API.Written by Cursor Bugbot for commit 135e672. This will update automatically on new commits. Configure here.