c61a264a65
* perf(pdf): native Pdfium-based reflow engine with auto-open Migrate PDF-to-Markdown reflow generation from PDFBox to a custom native implementation using Pdfium. This transition improves processing speed by ~10x and significantly reduces memory overhead. - Native JNI Bridge: Implemented `pdfium_bridge.cpp` using `dlopen` to hook into the existing `libpdfium.so` memory space. - Optimized Extraction: Replaced character-by-character JNI calls with bulk array retrieval (`getPageFontSizes`, `getPageFontWeights`), drastically reducing JNI boundary overhead. - Enhanced Accuracy: Improved Markdown formatting logic by using native font weight (bold) and relative font size variance (headers). - Thread Safety: Refactored generator to process pages sequentially while synchronized with the global `PdfiumCore.lock` to ensure stability across concurrent UI operations. - Seamless UX: Implemented a reactive auto-open system in the PDF viewer that tracks user intent and navigates to the reflow view immediately upon background task completion. * Improved PDF to Markdown conversion and added cache cleanup. - Implemented automated cleanup of imported file caches when deleting books. - Enhanced `PdfToMarkdownGenerator` with support for font flags (italics), improved kerning, and smarter paragraph wrapping. - Updated `NativePdfiumBridge` and C++ JNI code to extract font information flags from PDFium. * Implemented seamless file switching and enhanced reflow transition logic. Key changes include: - Added `switchToFileSeamlessly` to `MainViewModel` to handle state transitions and navigation when switching between PDF and reflowed text views. - Updated `generateAndImportReflowFile` to support automatic opening of the generated file at a specific page/chapter. - Integrated `NavigationEvent` and `CompletableDeferred` to manage asynchronous navigation and state updates during file switches. - Modified `EpubReaderScreen` and `PdfViewerScreen` to pass the current position when toggling between PDF and text modes. - Updated `AppNavigation` to move navigation logic out of the `NavHost` and added loading overlays to viewers to improve UI feedback during transitions. |
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