36a3a0cc3a
Co-authored-by: vedi0boy <nate@origin8publishing.com> Co-authored-by: Uri Tauber <uritaube@gmail.com>
77 lines
2.9 KiB
C++
77 lines
2.9 KiB
C++
#pragma once
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#include <Epub.h>
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#include <GfxRenderer.h>
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#include <memory>
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#include <string>
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/**
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* CrossPoint position representation.
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*/
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struct CrossPointPosition {
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int spineIndex; // Current spine item (chapter) index
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int pageNumber; // Current page within the spine item
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int totalPages; // Total pages in the current spine item
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uint16_t paragraphIndex = 0; // 1-based synthetic paragraph index from XPath p[N]
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bool hasParagraphIndex = false; // True when paragraphIndex was resolved from XPath
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uint16_t liIndex = 0; // Running <li> count at the matched XPath element
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bool hasLiIndex = false; // True when target element is <li> and liIndex was resolved
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char xpathAnchorId[64] = {}; // First <a id> captured inside the matched XPath element
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};
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/**
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* Progress position representation.
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*/
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struct SavedProgressPosition {
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std::string xpath; // XPath-like progress string
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float percentage; // Progress percentage (0.0 to 1.0)
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};
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/**
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* Maps between CrossPoint and SavedProgress position formats, such as those used by KOReader.
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*
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* CrossPoint tracks position as (spineIndex, pageNumber).
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* SavedProgress uses XPath-like strings + percentage.
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*
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* Since CrossPoint discards HTML structure during parsing, we generate
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* synthetic XPath strings based on spine index, using percentage as the
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* primary sync mechanism.
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*/
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class ProgressMapper {
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public:
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/**
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* Convert CrossPoint position to SavedProgress format.
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*
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* @param epub The EPUB book
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* @param pos CrossPoint position
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* @return SavedProgress position
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*/
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static SavedProgressPosition toSavedProgress(const std::shared_ptr<Epub>& epub, const CrossPointPosition& pos);
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/**
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* Convert SavedProgress position to CrossPoint format.
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*
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* Note: The returned pageNumber may be approximate since different
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* rendering settings produce different page counts.
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*
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* @param epub The EPUB book
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* @param savedPos SavedProgress position
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* @param renderer GfxRenderer for page count estimation
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* @param currentSpineIndex Index of the currently open spine item (for density estimation)
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* @param totalPagesInCurrentSpine Total pages in the current spine item (for density estimation)
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* @return CrossPoint position
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*/
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static CrossPointPosition toCrossPoint(const std::shared_ptr<Epub>& epub, const SavedProgressPosition& savedPos,
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GfxRenderer& renderer, int currentSpineIndex = -1,
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int totalPagesInCurrentSpine = 0, int fallbackTotalPages = 0);
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private:
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/**
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* Generate a fallback XPath by streaming the spine item's XHTML and resolving
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* a paragraph/text position from intra-spine progress.
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* Produces a full ancestry path such as
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* /body/DocFragment[3]/body/p[42]/text().17.
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*/
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static std::string generateXPath(const std::shared_ptr<Epub>& epub, int spineIndex, float intraSpineProgress);
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};
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