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perf: investigate redundant caption lookup passes during rendering

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@KrishCodesw 已经在做这个了。

开始于 2026年10月14日。

  • #2537 来自 @KrishCodesw —— 未关闭

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难度
4/5
预计耗时
3-5 天
新手友好度
25/100
Issue 类型
重构
描述清晰度
基本清楚
活跃度
活跃
技术栈
rust

调研方向

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.

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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.

主要语言
Rust
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从这里开始

  1. 先读完整个 Issue,再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

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