[0168] 改进 PDF 阅读器性能#3527
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将 fz_document/fz_stream/fz_buffer 提升为成员变量，在 loadFromFile 时打开并保持到 clear() 或析构时才释放。renderPageToLabel 和 extractPageLinks 直接复用已打开的文档句柄，消除重复打开文档的 巨大开销。 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
1. 将页面渲染缓存从 QHash 替换为 QCache，默认上限 30 条，防止 大文档反复缩放时内存无限增长。添加 cacheSize/cacheMaxSize 测试 接口和两个单元测试验证淘汰行为。 2. applyZoomToLabels 改为仅调整可见及预加载范围内的 label 尺寸， 避免大文档在 pinch 缩放过程中遍历所有页面 label。 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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改进内容
PDF 文档常驻内存
fz_document/fz_stream/fz_buffer提升为成员变量，在loadFromFile时打开并保持到clear()才释放。renderPageToLabel和extractPageLinks直接复用已打开的文档句柄，消除每次渲染重复fz_open_document_with_stream的巨大开销。LRU 缓存淘汰
QHash<PdfPageCacheKey, QPixmap>替换为QCache，默认上限 30 条，自动 LRU 淘汰。懒加载尺寸调整
applyZoomToLabels改为仅调整可见及PRELOAD_MARGIN范围内的 label 尺寸。测试
test_cacheRespectsMaxSizetest_cacheDoesNotGrowUnbounded提交历史
[0168] PDF文档常驻内存，避免每次渲染重新打开[0168] LRU缓存与懒加载尺寸调整[0168] 更新任务文档，标记已完成项🤖 Generated with Claude Code