3696794591
## Summary _Revision to @blindbat's #802. Description comes from the original PR._ - Replace `std::list` with `std::vector` for word storage in `TextBlock` and `ParsedText` - Use index-based access (`words[i]`) instead of iterator advancement (`std::advance(it, n)`) - Remove the separate `continuesVec` copy that was built from `wordContinues` for O(1) access — now unnecessary since `std::vector<bool>` already provides O(1) indexing ## Why `std::list` allocates each node individually on the heap with 16 bytes of prev/next pointer overhead per node. For text layout with many small words, this means: - Scattered heap allocations instead of contiguous memory - Poor cache locality during iteration (each node can be anywhere in memory) - Per-node malloc/free overhead during construction and destruction `std::vector` stores elements contiguously, giving better cache performance during the tight rendering and layout loops. The `extractLine` function also benefits: list splice was O(1) but required maintaining three parallel iterators, while vector range construction with move iterators is simpler and still efficient for the small line-sized chunks involved. ## Files changed - `lib/Epub/Epub/blocks/TextBlock.h` / `.cpp` - `lib/Epub/Epub/ParsedText.h` / `.cpp` ## AI Usage YES ## Test plan - [ ] Open an EPUB with mixed formatting (bold, italic, underline) — verify text renders correctly - [ ] Open a book with justified text — verify word spacing is correct - [ ] Open a book with hyphenation enabled — verify words break correctly at hyphens - [ ] Navigate through pages rapidly — verify no rendering glitches or crashes - [ ] Open a book with long paragraphs — verify text layout matches pre-change behavior --------- Co-authored-by: Kuanysh Bekkulov <kbekkulov@gmail.com>
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