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perf: investigate redundant caption lookup passes during rendering

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@KrishCodesw 已經在處理了。

開始於 2026年10月14日。

  • #2537 來自 @KrishCodesw —— 未關閉

評估

難度
4/5
預估耗時
3-5 天
新手友好度
25/100
Issue 類型
重構
描述清晰度
基本清楚
活躍度
活躍
技術堆疊
rust

研究方向

Start with find_active_caption_segment in crates/rendering/src/layers/captions.rs and its caller CaptionsLayer::prepare, to see how the active-segment search and the exit-animation fallback scan are sequenced. Build a benchmark on synthetic caption lists covering active frames, gaps and exit animations, plus equivalence tests for timing boundaries, overlaps and unsorted input. Done means the selections match exactly and the benchmark shows a gain, or the change is rejected with the numbers recorded.

由索引模型根據 Issue 內容生成。

描述

At 3d19c5cfa5e636107e78adde6d55be78404d4f23, find_active_caption_segment in crates/rendering/src/layers/captions.rs searches for an active segment, then scans again for an exit animation when none is active. CaptionsLayer::prepare uses this lookup per frame.

A candidate optimization is to retain the first animation candidate while searching for an active segment. It must preserve active-over-animation priority and original segment order, including overlaps and unsorted input.

Validation needed:

  • Exact before/after selection equivalence, including timing boundaries.
  • Release benchmarks on synthetic caption lists, separating active frames, gaps and exit animations.
  • Reject the change if extra work on active frames outweighs the fallback savings.

This is a code-level performance hypothesis; no speedup or end-to-end playback/export improvement has been measured yet.

主要語言
Rust
星號
23.2k
分支
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平均合併
1 天 5 小時
30 天內合併 PR
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從這裡開始

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  2. 在 Issue 下留言說明你要接手 —— 這能避免兩個人做同樣的事。
  3. Fork 儲存庫,在一個分支上完成修改。
  4. 送出 Pull Request,並在描述裡引用這個 Issue 編號。

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