58 lines
2.5 KiB
C++
58 lines
2.5 KiB
C++
#pragma once
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#include <functional>
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#include <memory>
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#include <optional>
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#include <string>
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#include <vector>
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#include "Epub.h"
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class Page;
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class GfxRenderer;
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class Section {
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std::shared_ptr<Epub> epub;
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const int spineIndex;
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GfxRenderer& renderer;
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std::string filePath;
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FsFile file;
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std::vector<uint32_t> lut; // Cached page byte-offsets; loaded once, avoids per-page LUT seek
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void writeSectionFileHeader(int fontId, float lineCompression, bool extraParagraphSpacing, uint8_t paragraphAlignment,
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uint16_t viewportWidth, uint16_t viewportHeight, bool hyphenationEnabled,
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bool embeddedStyle, uint8_t imageRendering);
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uint32_t onPageComplete(std::unique_ptr<Page> page);
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public:
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uint16_t pageCount = 0;
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int currentPage = 0;
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explicit Section(const std::shared_ptr<Epub>& epub, const int spineIndex, GfxRenderer& renderer)
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: epub(epub),
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spineIndex(spineIndex),
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renderer(renderer),
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filePath(epub->getCachePath() + "/sections/" + std::to_string(spineIndex) + ".bin") {}
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~Section() = default;
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bool loadSectionFile(int fontId, float lineCompression, bool extraParagraphSpacing, uint8_t paragraphAlignment,
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uint16_t viewportWidth, uint16_t viewportHeight, bool hyphenationEnabled, bool embeddedStyle,
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uint8_t imageRendering);
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bool clearCache();
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bool createSectionFile(int fontId, float lineCompression, bool extraParagraphSpacing, uint8_t paragraphAlignment,
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uint16_t viewportWidth, uint16_t viewportHeight, bool hyphenationEnabled, bool embeddedStyle,
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uint8_t imageRendering, const std::function<void(int)>& progressFn = nullptr);
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std::unique_ptr<Page> loadPageFromSectionFile();
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// Look up the page number for an anchor id from the section cache file.
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std::optional<uint16_t> getPageForAnchor(const std::string& anchor) const;
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// Look up the page number for a paragraph index (1-based, from XPath p[N]).
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// Uses the per-page paragraph index LUT stored in the section cache.
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// Returns nullopt if the paragraph LUT is not available (old cache format).
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std::optional<uint16_t> getPageForParagraphIndex(uint16_t pIndex) const;
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// Look up the paragraph index for a given page number.
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// Returns the 1-based paragraph index of the last <p> element on or before the page.
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// Returns nullopt if the paragraph LUT is not available (old cache format).
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std::optional<uint16_t> getParagraphIndexForPage(uint16_t page) const;
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};
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