perf(danmaku): 弹幕渲染优化 — 卸主线程+预缓存+预加载窗口#66
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May 10, 2026 12:10
- getReleases() 原逻辑将 targetCommitish 与字符串 "develop" 直接比较， targetCommitish 实际存储的是 commit SHA，恒不匹配，导致 filter 永远返回空 - 新增 getAllReleases() 负责纯 API 拉取，getBranchHeadSha() 解析分支 HEAD SHA - getReleases() 改用与 getBranchHeadSha(CURRENT_BRANCH) 的比较结果过滤 - 分支 HEAD SHA 解析失败时降级（不分支过滤），避免网络异常直接炸 - getLatestPreReleaseBuild() 加 page <= 10 上限防止极端情况无限循环
三处改动均针对 VideoPlayerV3ViewModel（单文件）： 负载降低：loadDanmaku 将 XML 解析 + 10万条目映射 + groupBy 全量 移入 Dispatchers.Default，主线程只做一次 swapList(3万) + updateData(1次) 注释持久化：预备 milliSeconds 分段缓存直接存 Map<Long,List<DanmakuItemData>>，后续分段切分 map轉 value 从 dataList 的直接引用取得，不重 repeat 加载专精：loadDanmakuSegment 构建新 List 的工作全部迁到 Default，不与读写 切换空闲。updateDanmakuForPosition 预加载条件由 > 改为 >=，提前一整个地区 段(60s) 触发预读，边界前先于用户抵达即可。
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配合 PR f87ea00 同时完成一套弹幕渲染优化。