Move OpenCV, TensorFlow.js, and COCO-SSD from optionalDependencies
to devDependencies. These libraries are now bundled into the vendor
directory during build instead of being optional runtime dependencies.
Also upgrade @rollup/plugin-terser from 0.4.4 to 1.0.0 which
requires Node.js 20+ and includes updated dependencies.
Related changes:
- Move @techstark/opencv-js to devDependencies
- Move @tensorflow/tfjs to devDependencies
- Move @tensorflow-models/coco-ssd to devDependencies
- Update @rollup/plugin-terser to 1.0.0
Update PanelDetector to load OpenCV, TensorFlow.js, and COCO-SSD
from local vendor directory instead of importing npm packages.
This ensures the libraries are available after build and avoids
runtime dependency resolution issues.
- Change imports to use ../vendor paths instead of npm packages
- Add caching to prevent reloading libraries
- Add error handling for failed library loads with console warnings
- Update OpenCV loading to handle both default and named exports
Add pre-built panel detection libraries to vendor directory.
These are copied from node_modules during the build process and
included with the application for panel detection functionality.
Included libraries:
- vendor/opencv/opencv.js - OpenCV.js for image processing
- vendor/tfjs/tf.min.js - TensorFlow.js for ML inference
- vendor/coco-ssd/coco-ssd.min.js - COCO-SSD model for object detection
These files enable the panel mode feature in the reader.
Update rollup config to copy OpenCV, TensorFlow.js, and COCO-SSD
libraries to vendor directory. These dependencies are used for the
panel detection feature and need to be bundled with the application
instead of loaded from npm packages at runtime.
- Add copyOpenCV() plugin to copy OpenCV.js from node_modules
- Add copyTensorFlow() plugin to copy TensorFlow.js from node_modules
- Add copyCocoSsd() plugin to copy COCO-SSD model from node_modules
- Apply formatting consistency (double quotes for imports)
Fix npm install errors and make ML/CV libraries truly optional.
Changes:
- Move dependencies from "dependencies" to "optionalDependencies"
- Fix @techstark/opencv-js version from "^4.12.0" to "4.12.0-release.1"
- The caret syntax (^) doesn't work with suffix versions like -release.1
- Use exact version match instead
Why optionalDependencies:
- Installation won't fail if these packages fail to install
- Users can opt-out with: npm install foliate-js --omit=optional
- Maintains the library's "no hard dependencies" philosophy
- Graceful degradation: panel detection falls back to grid-only mode
Behavior:
- Default: npm attempts to install OpenCV, TensorFlow, COCO-SSD (~4.5MB)
- With --omit=optional: skips heavy ML/CV libraries
- Either way: library works, panel detection gracefully adapts
This resolves npm install errors where "^4.12.0" couldn't be found
because the actual version is "4.12.0-release.1".
Document the new panel detection feature for manga and comics,
including installation options and usage examples.
Changes to README.md:
- Added "Optional panel detection for manga and comics" to Features list
- Added new "Panel Detection" section after "PDF and Other Fixed-Layout Formats"
- Documented the optionalDependencies approach and --omit=optional flag
- Explained the multi-tier fallback system (OpenCV → ML → Grid)
- Provided code examples for enabling panel mode and navigation
- Documented keyboard shortcuts (P, Arrow keys, Escape)
- Clarified graceful degradation when dependencies are missing
The documentation follows existing README patterns:
- Concise technical style
- Code examples with proper syntax
- Clear installation instructions
- Explanation of feature behavior and fallbacks
This helps users understand:
1. What panel detection is and when it's useful
2. How to install with or without the feature
3. How to use the API in their applications
4. What happens when optional dependencies aren't installed
Add a checkbox menu item to the demo reader's settings menu that
allows users to toggle panel detection mode on or off.
Implementation details:
- Adds "Panel Mode" checkbox to existing settings menu
- Uses the createMenu API with type="checkbox"
- Safely checks for togglePanelMode method availability
- Checks current panel-mode state before toggling
- Properly enables/disables panel mode via attribute API
User-facing behavior:
- Click gear icon → settings menu appears
- Check/uncheck "Panel Mode" to enable/disable
- Works seamlessly with existing layout options
- Only active when viewing fixed-layout content
This change only affects the demo reader (reader.html + reader.js),
not the foliate-js library itself. The library's panel detection
API in fixed-layout.js remains unchanged.
The panel mode toggle provides easy access to the new panel
navigation features for testing and demonstration purposes.
Implement comprehensive panel-aware navigation for manga, comics,
and other fixed-layout content with automatic panel detection.
Core features:
- Panel mode toggle via 'panel-mode' attribute
- Touch gesture support (swipe, tap)
- Visual panel overlay with SVG highlighting
- Auto-zoom to center and fit each panel
- Seamless integration with existing page navigation
Panel detection integration:
- Initialize PanelDetector on component construction
- Detect panels when entering panel mode
- Cache detection results per page
- Support re-detection via force flag
Panel navigation:
- nextPanel(): advance to next panel, wrapping to next page
- prevPanel(): go to previous panel, wrapping to previous page
- Auto-enter panel mode on first panel navigation
- Visual feedback with current panel highlighting
Touch support (previously missing from fixed-layout):
- touchstart: record initial position and timestamp
- touchmove: prevent default for significant movement
- touchend: velocity-based swipe detection
- Panel mode: tap to toggle overlay, swipe to navigate
Visual overlay:
- SVG rectangles showing detected panels
- Highlight current panel in orange (#ff6b35)
- Dim other panels in semi-transparent white
- Pointer-events none for non-blocking overlay
Zoom behavior:
- Calculate scale to fit panel within viewport
- Center panel with scroll positioning
- Apply via existing zoom attribute mechanism
- Re-render overlay after zoom
Internal methods:
- #nextPage() / #prevPage(): bypass panel-mode check
- #enterPanelMode() / #exitPanelMode(): mode management
- #showPanelOverlay() / #hidePanelOverlay(): overlay management
- #zoomToPanel(): auto-center and scale to panel
- #addTouchSupport(): attach touch event listeners
- #onTouchStart/Move/End: touch gesture handling
- #handlePanelTouch: panel-mode specific touch logic
Public API:
- panelCount: number of detected panels
- currentPanelIndex: current panel index
- togglePanelMode(): enter/exit panel mode
Observer attributes:
- 'zoom': existing zoom support
- 'panel-mode': new panel mode attribute
This implementation brings fixed-layout renderer to feature parity
with paginator.js regarding touch support while adding unique
panel-aware navigation capabilities.
Extend keyboard navigation to support panel mode when enabled.
Changes:
- Check for panel-mode attribute before routing key events
- Route Arrow keys and Vim keys (h/l) to panel navigation in panel mode
- Add 'P' key to toggle panel mode
- Add 'Escape' key to exit panel mode
- Maintain backward compatibility with existing page navigation
When panel mode is active:
- ArrowRight/l: next panel
- ArrowLeft/h: previous panel
- Escape/P: exit panel mode
When panel mode is inactive:
- ArrowRight/l: next page (existing behavior)
- ArrowLeft/h: previous page (existing behavior)
- P: enter panel mode (new feature)
Implement a comprehensive panel detection system for manga and comics
with automatic fallback chain for maximum compatibility.
Core detector (detector.js):
- PanelDetector class with in-memory caching
- Lazy-loading of OpenCV and TensorFlow.js
- Validation logic to filter poor detections
- Cache management to avoid re-detection
OpenCV edge detection (opencv.js):
- Canny edge detection for panel boundaries
- Contour finding with bounding box extraction
- Size and aspect ratio filtering
- Reading order sorting (top-to-bottom, left-to-right)
ML-based detection (coco-ssd.js):
- COCO-SSD pre-trained model integration
- Object detection for irregular panel layouts
- Rectangular filtering for panel-like regions
- Handles edge cases where edge detection fails
Grid-based fallback (grid.js):
- Lightweight 3x3 grid detection
- Empty cell detection via alpha channel analysis
- Adjacent panel merging algorithm
- Always works as final fallback
The detection pipeline tries OpenCV first (fast, accurate),
falls back to ML detection if validation fails,
and uses grid detection as ultimate baseline.
The MOBI6.init() method builds #fileposList (the map of all filepos byte-offset references, used to insert <a id="fileposXXXX"> anchors into section HTML) after calling getGuide() and the TOC-section loader — both of which call createDocument() → loadText(), which caches the section HTML. Since #fileposList is still empty at that point, the cached HTML has no anchor elements.
Later, when Foliate calls getElementById('filepos12345') on the cached (anchor-less) document, it returns null, so the paginator falls back to ?? 0 — i.e. scroll to position 0 = first page.
For EPUB this doesn't happen because chapters are separate files; navigation loads a new section by index, not by searching for an anchor element within one section.
Co-authored-by: Lars E. <lars@ermert.es>
If the viewer is running in an RTL context (this is not the same as the
reading direction of the Book itself), and a fixed-layout rendered view
is scaled (which is often the case), anchoring the transform to the
left breaks page positioning.
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John Factotum
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LarzansandLars E.
Francesco Martini
fondoger
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