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Consolidate chapter page data into single file (#144)

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## Summary

* Consolidate chapter page data into single file
* Header structure of the file stays the same, following the page count,
we now put a LUT offset
   * The page data is all then appended to this file
* Finally the LUT is appended to the end of the file, and the page count
is updated
* This will also significantly improve the duration of cache cleanup
which takes a while to scan the directory and cleanup content
* Remove page file version as it's all tied up into the section file now
* Bumped section file version to 7
* Moved section content into sub directory
* Updated docs

## Additional Context

* Benchmarks:
  * Generating 74 pages of content from a chapter in Jade Legacy took:
    * master: 6,229ms
    * this PR: 1,305ms
    * Speedup of 79%
  * Generating 207 pages of content from Livesuit book:
    * With progress bar UI updates:
      * master: 24,250ms
      * this PR: 8,063ms
      * Speedup of 67%
    * Without progress bar UI updates:
      * master: 13,055ms
      * this PR: 3,600ms
      * Speedup of 72%
This commit is contained in:
Dave Allie
2025-12-29 12:19:54 +10:00
committed by GitHub
parent b1763821b5
commit 534504cf7a
11 changed files with 162 additions and 143 deletions
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24
lib/Epub/Epub/Section.h
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@@ -11,11 +11,12 @@ class Section {
std::shared_ptr<Epub> epub;
const int spineIndex;
GfxRenderer& renderer;
std::string cachePath;
std::string filePath;
File file;
void writeCacheMetadata(int fontId, float lineCompression, bool extraParagraphSpacing, int viewportWidth,
int viewportHeight) const;
void onPageComplete(std::unique_ptr<Page> page);
void writeSectionFileHeader(int fontId, float lineCompression, bool extraParagraphSpacing, int viewportWidth,
int viewportHeight);
size_t onPageComplete(std::unique_ptr<Page> page);
public:
int pageCount = 0;
@@ -25,14 +26,13 @@ class Section {
: epub(epub),
spineIndex(spineIndex),
renderer(renderer),
cachePath(epub->getCachePath() + "/" + std::to_string(spineIndex)) {}
filePath(epub->getCachePath() + "/sections/" + std::to_string(spineIndex) + ".bin") {}
~Section() = default;
bool loadCacheMetadata(int fontId, float lineCompression, bool extraParagraphSpacing, int viewportWidth,
int viewportHeight);
void setupCacheDir() const;
bool loadSectionFile(int fontId, float lineCompression, bool extraParagraphSpacing, int viewportWidth,
int viewportHeight);
bool clearCache() const;
bool persistPageDataToSD(int fontId, float lineCompression, bool extraParagraphSpacing, int viewportWidth,
int viewportHeight, const std::function<void()>& progressSetupFn = nullptr,
const std::function<void(int)>& progressFn = nullptr);
std::unique_ptr<Page> loadPageFromSD() const;
bool createSectionFile(int fontId, float lineCompression, bool extraParagraphSpacing, int viewportWidth,
int viewportHeight, const std::function<void()>& progressSetupFn = nullptr,
const std::function<void(int)>& progressFn = nullptr);
std::unique_ptr<Page> loadPageFromSectionFile();
};