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43 lines
2.0 KiB
Markdown
43 lines
2.0 KiB
Markdown
---
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id: TASK-20.2
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title: Add renderer-to-main IPC contract for measured overlay content bounds
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status: Done
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assignee: []
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created_date: '2026-02-12 08:47'
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updated_date: '2026-02-13 08:05'
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labels: []
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dependencies: []
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parent_task_id: TASK-20
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priority: medium
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---
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## Description
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<!-- SECTION:DESCRIPTION:BEGIN -->
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Add renderer-to-main IPC for content measurement reporting, so main process can size each overlay window from post-layout DOM bounds.
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<!-- SECTION:DESCRIPTION:END -->
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## Acceptance Criteria
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<!-- AC:BEGIN -->
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- [x] #1 Preload exposes a typed API for reporting overlay content bounds with layer metadata.
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- [x] #2 Main-process IPC handler validates payload shape/range and stores latest measurement per layer.
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- [x] #3 Renderer emits measurement updates on subtitle, mode, style, and render-metric changes with throttling/debounce.
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- [x] #4 No crashes or unbounded logging when measurements are missing/empty/invalid; fallback behavior is explicit.
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<!-- AC:END -->
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## Implementation Notes
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<!-- SECTION:NOTES:BEGIN -->
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Added a typed `OverlayContentMeasurement` IPC contract exposed in preload and Electron API typings. Implemented a main-process measurement store with strict payload validation and rate-limited warning logs for invalid reports. Added renderer-side debounced measurement reporting that emits updates on subtitle content/mode/style/render-metric and resize changes, explicitly sending `contentRect: null` when no measured content exists to signal fallback behavior.
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Added unit coverage for measurement validation and store behavior.
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Closed per user request to delete parent task and subtasks.
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<!-- SECTION:NOTES:END -->
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## Final Summary
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<!-- SECTION:FINAL_SUMMARY:BEGIN -->
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Implemented renderer-to-main measurement reporting for overlay content bounds with per-layer metadata. Main now validates and stores latest measurements per layer safely, renderer emits debounced updates on relevant state changes, and invalid/missing payload handling is explicit and non-spammy.
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<!-- SECTION:FINAL_SUMMARY:END -->
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