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- Add crosspoint-ef fork notice to README with links to upstream
- Include feature overview, user guide, and technical comparison docs
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# CrossPoint Reader
# CrossPoint Reader (ef fork)
> **Note:** This is **crosspoint-ef**, a heavily customized fork of [CrossPoint Reader](https://github.com/crosspoint-reader/crosspoint-reader) with additional features, UI improvements, and bug fixes. It also uses a [forked community-sdk](https://code.cottongin.xyz/cottongin/community-sdk) with additional hardware support.
>
> **Documentation:**
> - [Feature Overview](./docs/crosspoint-ef-features.md) - What's new in this fork
> - [User Guide](./docs/crosspoint-ef-user-guide.md) - How to use the new features
> - [Technical Comparison](./docs/branch-comparison-summary.md) - Detailed diff from upstream
---
Firmware for the **Xteink X4** e-paper display reader (unaffiliated with Xteink).
Built using **PlatformIO** and targeting the **ESP32-C3** microcontroller.

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# Branch Comparison Summary: crosspoint-ef vs 0.16.0
This document provides a comprehensive comparison between the `crosspoint-ef` branch and the upstream `0.16.0` release for merge planning and implementation decisions.
## Branch History
| Branch | Base | Commits Since Base | Status |
|--------|------|-------------------|--------|
| `crosspoint-ef` | 0.15.0 | 90+ | Active development |
| `0.16.0` | 0.15.0 | 30 | Released |
Both branches diverged from `0.15.0` at commit `3ce11f14`.
---
## Feature Comparison Matrix
### Major Features
| Feature | crosspoint-ef | 0.16.0 | Notes |
|---------|:-------------:|:------:|-------|
| Dictionary Support | Yes | No | StarDict format with word selection |
| Bookmark System | Yes | No | Per-book bookmarks with visual indicator |
| Quick Menu | Yes | No | Power button quick access |
| Library Search | Yes | No | Character picker with weighted search |
| CSS Parsing | Yes | No | Element, class, inline styles |
| Inline Images (PNG/JPEG) | Yes | No | With caching and dithering |
| Custom Fonts | Yes | No | Atkinson Hyperlegible, Fern Micro |
| Enhanced Web Server | Yes | Partial | File ops, MD5 API, mDNS |
| Companion App API | Yes | No | Deep links, WebSocket uploads |
| Reading Lists | Yes | No | With pinning support |
| Tab Bar Enhancements | Yes | No | Scrolling, overflow indicators |
| High Contrast Mode | Yes | No | System-wide |
| Bezel Compensation | Yes | No | Edge defect compensation |
| Sleep Screen Edge Detection | Yes | No | Dominant color fill |
| Recents Improvements | Yes | No | Badges, removal, clearing |
| Progress Bar Status Bar | Yes | Yes | Same feature |
| Spanish Hyphenation | No | Yes | Missing in crosspoint-ef |
| XTC/XTCH Author Extraction | No | Yes | Missing in crosspoint-ef |
| OTA Rework | No | Yes | Different implementation |
| KOReader MD5 Binary Matching | No | Yes | Missing in crosspoint-ef |
| Relative Position on Settings Change | No | Yes | Missing in crosspoint-ef |
| Multi-line Keyboard Entry | No | Yes | Missing in crosspoint-ef |
| Italics on Image Alt | No | Yes | Missing in crosspoint-ef |
| Page Turn on Button Press (UX) | No | Yes | When chapter skip disabled |
### Bug Fixes
| Fix | crosspoint-ef | 0.16.0 | Notes |
|-----|:-------------:|:------:|-------|
| Large EPUB indexing O(n²)→O(n) | Yes | Yes | Same fix |
| Settings validation on read | Yes | Yes | Same fix |
| Line break fixes | Yes | Yes | Similar fixes |
| Rotate origin in drawImage | Yes | Yes | Same fix |
| Short-press power wakeup | Yes | Yes | Same fix |
| TXT books in recent tab | Yes | Yes | Same fix |
| B&W filters for covers | Yes | Yes | Same fix |
| Cover fit artifacts | Yes | Yes | Same fix |
| Grayscale state corruption | Yes | No | Unique to crosspoint-ef |
| Memory graceful degradation | Yes | No | Unique to crosspoint-ef |
| Chapter Selection UI (KOReader) | No | Yes | Missing in crosspoint-ef |
| Front layout in mapLabels() | No | Yes | Missing in crosspoint-ef |
---
## Files Changed Summary
### crosspoint-ef Unique Files (New)
| Category | Files |
|----------|-------|
| Dictionary | `src/activities/dictionary/` (8 files), `lib/StarDict/` (4 files) |
| Bookmarks | `src/BookmarkStore.cpp/.h`, `src/activities/home/BookmarkListActivity.cpp/.h` |
| Quick Menu | `src/activities/util/QuickMenuActivity.cpp/.h` |
| CSS | `lib/Epub/Epub/css/` (3 files) |
| Images | `lib/Epub/Epub/blocks/ImageBlock.cpp/.h`, `lib/Epub/Epub/converters/` (6 files) |
| Custom Fonts | `src/customFonts.cpp`, `src/fontIds.h`, `lib/EpdFont/builtinFonts/custom/` (50+ files) |
| Utils | `src/util/Md5Utils.cpp/.h`, `src/util/StringUtils.cpp/.h` |
| Lists | `src/BookListStore.cpp/.h` |
| Docs | `docs/webserver-api-reference.md`, `docs/companion-app-deep-link-API.md`, `docs/troubleshooting.md` |
### crosspoint-ef Modified Files (Significant Changes)
| File | Changes |
|------|---------|
| `src/network/CrossPointWebServer.cpp` | +1083 lines (file ops, API, WebSocket) |
| `src/activities/home/MyLibraryActivity.cpp` | +700 lines (tabs, search, badges) |
| `src/main.cpp` | +255 lines (feature integration) |
| `lib/GfxRenderer/GfxRenderer.cpp` | +439 lines (contrast, bezel) |
| `lib/Epub/Epub/parsers/ChapterHtmlSlimParser.cpp` | +596 lines (CSS integration) |
| `src/CrossPointSettings.cpp/.h` | New settings fields |
| `src/activities/boot_sleep/SleepActivity.cpp` | Edge detection, caching |
| `src/RecentBooksStore.cpp` | Badges, removal, metadata |
| `src/ScreenComponents.cpp` | Tab bar enhancements |
### 0.16.0 Unique Files/Changes
| File | Description |
|------|-------------|
| `lib/Epub/Epub/hyphenation/generated/hyph-es.trie.h` | Spanish hyphenation (removed in ef) |
| `lib/KOReaderSync/` | KOReader credential handling (removed in ef) |
| `src/network/OtaUpdater.cpp` | OTA rework |
---
## Merge Strategy Recommendations
### Phase 1: Cherry-pick 0.16.0 Fixes into crosspoint-ef
**Low Risk - Recommended First:**
1. **Spanish hyphenation support** (#558)
- Add `hyph-es.trie.h` back
- Update `LanguageRegistry.cpp`
2. **Render keyboard entry over multiple lines** (#567)
- Update `KeyboardEntryActivity.cpp`
3. **Correctly render italics on image alt** (#569)
- Minimal change to text rendering
4. **Page turning on button pressed** (#451)
- UX improvement when chapter skip disabled
5. **Missing front layout in mapLabels()** (#564)
- Bug fix for button mapping
**Medium Risk:**
6. **KOReader document MD5 binary matching** (#529)
- May conflict with MD5Utils changes
7. **Chapter Selection UI bugs** (#501)
- Review for conflicts with tab bar changes
8. **Relative position on settings change** (#486)
- Reader state management change
**Higher Risk:**
9. **OTA feature rework** (#509)
- Compare implementations, may need reconciliation
- crosspoint-ef has different OTA changes
10. **Extract author from XTC/XTCH** (#563)
- XTC format was removed in crosspoint-ef
- Evaluate if needed
### Phase 2: Potential Upstream Contributions from crosspoint-ef
**High Value, Moderate Complexity:**
1. **Dictionary Support**
- Self-contained feature
- New files, minimal integration points
- Requires shipping dictionary data
2. **Bookmark System**
- Clean implementation
- New files with reader integration
3. **Quick Menu**
- Simple overlay feature
- Depends on bookmark and dictionary
4. **CSS Parsing**
- Significant EPUB improvement
- Well-isolated in `lib/Epub/Epub/css/`
**High Value, Higher Complexity:**
5. **Inline Image Support**
- Major EPUB enhancement
- Multiple new converters
- Memory management considerations
6. **Library Search**
- Integrated into MyLibraryActivity
- Tab bar changes included
7. **Enhanced Web Server**
- Large changes to CrossPointWebServer
- New API endpoints
- WebSocket uploads
**Medium Value:**
8. **Custom Fonts**
- Large binary additions (font headers)
- Clean integration
9. **Display Enhancements**
- High contrast, bezel compensation
- Settings additions
10. **Reading Lists**
- New feature with web API
---
## Potential Conflicts
### High Conflict Risk
| Area | crosspoint-ef | 0.16.0 | Resolution |
|------|---------------|--------|------------|
| `MyLibraryActivity.cpp` | Major restructure | Minor fixes | Manual merge required |
| `CrossPointWebServer.cpp` | Extensive additions | Minimal changes | crosspoint-ef likely compatible |
| `CrossPointSettings.h` | Many new fields | Few changes | Additive, low conflict |
| `main.cpp` | Feature integration | Minor changes | Review integration points |
| `OtaUpdater.cpp` | Modified | Reworked (#509) | Compare implementations |
### Low Conflict Risk
| Area | Notes |
|------|-------|
| Dictionary files | All new, no conflicts |
| Bookmark files | All new, no conflicts |
| CSS parser files | All new, no conflicts |
| Image converter files | All new, no conflicts |
| Custom font files | All new, no conflicts |
| StarDict library | All new, no conflicts |
---
## Testing Considerations
### Regression Testing Required
After any merge:
1. **EPUB Reading**
- Page navigation
- Chapter selection
- CSS styling
- Image rendering
- Bookmark indicators
2. **Library Functions**
- Tab navigation
- Search functionality
- Recent books display
- List management
3. **Dictionary**
- Word selection
- Lookup accuracy
- Definition display
4. **Web Server**
- File upload/download
- API endpoints
- WebSocket uploads
- mDNS discovery
5. **Settings**
- All new settings persist correctly
- Settings migration from older versions
6. **Display**
- High contrast mode
- Bezel compensation (all orientations)
- Sleep screen variations
### Memory Testing
crosspoint-ef includes memory optimization fixes. After merge:
1. Test with large EPUBs (2000+ chapters)
2. Test opening multiple books in sequence
3. Test anti-aliasing under memory pressure
4. Monitor for ghosting/artifacts
---
## Priority Recommendations
### Immediate (For crosspoint-ef Stability)
1. Cherry-pick Spanish hyphenation (#558)
2. Cherry-pick multi-line keyboard entry (#567)
3. Cherry-pick italics on image alt (#569)
4. Cherry-pick front layout fix (#564)
### Short-term (Feature Completeness)
5. Evaluate OTA rework (#509) - compare implementations
6. Cherry-pick page turn UX (#451)
7. Cherry-pick relative position fix (#486)
### Long-term (Upstream Contribution)
8. Prepare dictionary feature as PR
9. Prepare bookmark system as PR
10. Prepare CSS parsing as PR
11. Evaluate inline image support for upstream
---
## File Inventory for Merge
### Files to Add to 0.16.0 Base (for upstream contribution)
```
src/activities/dictionary/
DictionaryMargins.h
DictionaryMenuActivity.cpp
DictionaryMenuActivity.h
DictionaryResultActivity.cpp
DictionaryResultActivity.h
DictionarySearchActivity.cpp
DictionarySearchActivity.h
EpubWordSelectionActivity.cpp
EpubWordSelectionActivity.h
src/activities/util/
QuickMenuActivity.cpp
QuickMenuActivity.h
src/activities/home/
BookmarkListActivity.cpp
BookmarkListActivity.h
src/
BookmarkStore.cpp
BookmarkStore.h
BookListStore.cpp
BookListStore.h
customFonts.cpp
fontIds.h
BadgeConfig.h
src/util/
Md5Utils.cpp
Md5Utils.h
StringUtils.cpp
StringUtils.h
src/images/
LockIcon.h
lib/StarDict/
StarDict.cpp
StarDict.h
DictHtmlParser.cpp
DictHtmlParser.h
DictPrefixIndex.generated.h
lib/Epub/Epub/css/
CssParser.cpp
CssParser.h
CssStyle.h
lib/Epub/Epub/blocks/
ImageBlock.cpp
ImageBlock.h
BlockStyle.h
lib/Epub/Epub/converters/
FramebufferWriter.cpp
FramebufferWriter.h
ImageDecoderFactory.cpp
ImageDecoderFactory.h
ImageToFramebufferDecoder.cpp
ImageToFramebufferDecoder.h
JpegToFramebufferConverter.cpp
JpegToFramebufferConverter.h
PngToFramebufferConverter.cpp
PngToFramebufferConverter.h
lib/EpdFont/builtinFonts/custom/
[All font header files]
docs/
webserver-api-reference.md
companion-app-deep-link-API.md
troubleshooting.md
crosspoint-ef-features.md
crosspoint-ef-user-guide.md
```
### Files to Merge Carefully
```
src/main.cpp
src/CrossPointSettings.cpp
src/CrossPointSettings.h
src/network/CrossPointWebServer.cpp
src/network/CrossPointWebServer.h
src/network/OtaUpdater.cpp
src/network/OtaUpdater.h
src/activities/home/MyLibraryActivity.cpp
src/activities/home/MyLibraryActivity.h
src/activities/reader/EpubReaderActivity.cpp
src/activities/settings/SettingsActivity.cpp
src/activities/settings/CategorySettingsActivity.cpp
src/ScreenComponents.cpp
src/ScreenComponents.h
src/RecentBooksStore.cpp
src/RecentBooksStore.h
lib/GfxRenderer/GfxRenderer.cpp
lib/GfxRenderer/GfxRenderer.h
lib/GfxRenderer/BitmapHelpers.cpp
lib/GfxRenderer/BitmapHelpers.h
lib/Epub/Epub/parsers/ChapterHtmlSlimParser.cpp
lib/Epub/Epub/parsers/ChapterHtmlSlimParser.h
lib/Epub/Epub/Section.cpp
lib/Epub/Epub/Section.h
```
---
## Conclusion
The `crosspoint-ef` branch represents a significant enhancement over the `0.15.0` baseline with 14+ major features. Most features are cleanly isolated in new files, making selective upstream contribution feasible.
**Recommended approach:**
1. First, bring crosspoint-ef up to date with 0.16.0 bug fixes
2. Then, evaluate individual features for upstream PR submission
3. Prioritize dictionary, bookmarks, and CSS parsing as highest-value contributions
The grayscale state corruption fix in crosspoint-ef should also be submitted upstream as a critical bug fix, as it prevents display artifacts under memory pressure.

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# CrossPoint-EF Branch Features
This document describes the features and enhancements unique to the `crosspoint-ef` branch, which diverged from CrossPoint Reader at version `0.15.0`.
## Overview
The `crosspoint-ef` branch introduces significant new functionality including:
- **Dictionary Support** - Offline StarDict dictionary with word selection from reader
- **Bookmark System** - Per-book bookmarks with visual indicators and management
- **Quick Menu** - Fast access to common actions via power button
- **Library Search** - Search across all books by title, author, or filename
- **CSS Support** - Parse and apply CSS styles from EPUB files
- **Inline Images** - PNG and Baseline JPEG image rendering within EPUBs
- **Custom Fonts** - Atkinson Hyperlegible Next and Fern Micro accessibility fonts
- **Enhanced Web Server** - File management, companion app API, mDNS discovery
- **Reading Lists** - Create, manage, and pin custom book lists
- **Display Enhancements** - High contrast mode, bezel compensation, sleep screen improvements
---
## Major Features
### 1. Dictionary Support
Full offline dictionary lookup using the StarDict format with fast prefix-indexed search.
**Features:**
- Word selection directly from EPUB pages
- Manual word entry via on-screen keyboard
- Rich HTML formatting in definitions (bold, italic, lists)
- Multi-page definitions with pagination
- Synonym support
- Case-insensitive search with prefix optimization
**Access Methods:**
- **Quick Menu** → Dictionary
- **Power Button** (when configured to `Dictionary` action)
**Dictionary Format:**
- StarDict format with dictzip compression
- Files located at `/dictionaries/dict-data` on SD card:
- `dict-data.ifo` - Metadata
- `dict-data.idx` - Word index
- `dict-data.dict.dz` - Compressed definitions
- `dict-data.syn` - Synonyms (optional)
**Technical Implementation:**
- Files: `src/activities/dictionary/`, `lib/StarDict/`
- Prefix jump table for near-instant lookups
- On-demand chunk decompression using miniz
- HTML definition parsing with entity decoding
---
### 2. Bookmark System
Per-book bookmark storage with visual indicators and dedicated management interface.
**Features:**
- Add/remove bookmarks from current page
- Visual folded-corner indicator on bookmarked pages
- Bookmarks tab in library showing all books with bookmarks
- Long-press to delete bookmarks
- Auto-generated bookmark names ("Chapter Title - Page X")
- Maximum 100 bookmarks per book
**Storage:**
- Binary file per book: `/.crosspoint/{epub_|txt_}<hash>/bookmarks.bin`
- Stores: name, spine index, content offset, page number, timestamp
**Technical Implementation:**
- Files: `src/BookmarkStore.cpp/.h`, `src/activities/home/BookmarkListActivity.cpp/.h`
- Bookmark identification by `spineIndex + contentOffset` (stable across re-renders)
---
### 3. Quick Menu
In-reader quick access menu for common actions, triggered by short power button press.
**Menu Options:**
1. **Dictionary** - Look up a word
2. **Bookmark** - Add/Remove bookmark (state-aware text)
3. **Clear Cache** - Free up storage space
4. **Settings** - Open settings menu
**Configuration:**
- Settings → Controls → Short Power Button Click → `Quick Menu`
**Technical Implementation:**
- File: `src/activities/util/QuickMenuActivity.cpp/.h`
- Renders overlay with navigation and selection
---
### 4. Library Search with Character Picker
Search across all books using a dynamic character picker interface.
**Features:**
- Character picker with dynamically generated character set from library content
- Weighted search scoring:
- Title match: 100 points (+50 if at start)
- Author match: 80 points (+40 if at start)
- Path match: 30 points
- Results sorted by relevance score
- Special controls: SPC (space), ← (backspace), CLR (clear)
**Navigation:**
- Left/Right: Select character
- Confirm: Add character to query
- Up/Down: Switch between picker and results
**Technical Implementation:**
- Integrated in `src/activities/home/MyLibraryActivity.cpp`
- Search tab accessible from library tab bar
---
### 5. CSS Support for EPUBs
Parse and apply CSS styles from EPUB stylesheets.
**Supported Selectors:**
- Element selectors: `p`, `div`, `h1`, etc.
- Class selectors: `.classname`
- Combined selectors: `element.classname`
- Grouped selectors: `h1, h2, h3`
- Inline styles: `style="..."`
**Supported Properties:**
- `text-align` (left, center, right, justify)
- `font-style` (normal, italic)
- `font-weight` (normal, bold)
- `text-decoration` (underline)
- `text-indent`
- `margin-top`, `margin-bottom`
- `padding-top`, `padding-bottom`
**Cascade Order:**
1. Element styles
2. Class styles
3. Element.class styles
4. Inline styles
**Technical Implementation:**
- Files: `lib/Epub/Epub/css/CssParser.cpp/.h`, `CssStyle.h`
- CSS files parsed during EPUB loading
- Styles applied during HTML parsing via `ChapterHtmlSlimParser`
---
### 6. Inline Image Support (PNG/Baseline JPEG)
Render embedded images within EPUB content.
**Supported Formats:**
- Baseline JPEG (.jpg, .jpeg)
- PNG (.png)
**Features:**
- Images decoded to 2-bit grayscale with dithering
- Image caching as `.pxc` files (2 bits per pixel, packed format)
- Row-by-row rendering to minimize memory usage
- Automatic scaling to fit page width
**Technical Implementation:**
- Files: `lib/Epub/Epub/blocks/ImageBlock.cpp/.h`
- Converters: `JpegToFramebufferConverter`, `PngToFramebufferConverter`
- Factory: `ImageDecoderFactory` routes to appropriate decoder
---
### 7. Custom Fonts
Additional accessibility-focused fonts beyond the standard Bookerly and Noto Sans.
**Available Fonts:**
1. **Atkinson Hyperlegible Next** - Designed for low-vision readers
2. **Fern Micro** - Optimized for small screens
**Font Sizes:**
- 12pt, 14pt, 16pt, 18pt for each font
- Full style support: Regular, Italic, Bold, Bold Italic
**Configuration:**
- Settings → Reader → Font Family → Custom
- Settings → Reader → Custom Font → [Select font]
- Settings → Reader → Fallback Font → [Bookerly/Noto Sans]
**Technical Implementation:**
- Files: `src/customFonts.cpp`, `src/fontIds.h`
- Font headers: `lib/EpdFont/builtinFonts/custom/`
- Conversion scripts: `lib/EpdFont/scripts/convert-builtin-fonts.sh`
---
### 8. Enhanced Web Server
Extended web server with file management operations and companion app support.
**File Operations:**
| Endpoint | Method | Description |
|----------|--------|-------------|
| `/api/files` | GET | List files with MD5 hashes for EPUBs |
| `/api/status` | GET | Device status (version, IP, heap, uptime) |
| `/api/archived` | GET | List archived books |
| `/api/hash` | GET | Compute/retrieve MD5 hash for sync |
| `/download` | GET | Download files |
| `/upload` | POST | Upload files (multipart) |
| `/delete` | POST | Delete files/folders |
| `/archive` | POST | Archive a book |
| `/unarchive` | POST | Restore archived book |
| `/rename` | POST | Rename files/folders |
| `/copy` | POST | Copy files/folders |
| `/move` | POST | Move files/folders |
| `/mkdir` | POST | Create folders |
| `/list` | GET/POST | Manage reading lists |
**WebSocket Upload (Port 81):**
- Fast binary uploads for large files
- Protocol: `START:<filename>:<size>:<path>` → `READY` → binary chunks → `DONE`
- Progress updates: `PROGRESS:<received>:<total>`
**mDNS Discovery:**
- Hostname: `crosspoint.local`
- Service: `_http._tcp` on port 80
- UDP discovery on port 8134
**Deep Link Support:**
- URL scheme: `crosspoint://<path>?host=<ip>&port=<port>&wsPort=<wsPort>`
- Paths: `files`, `library`, `lists`, `settings`
**Technical Implementation:**
- Files: `src/network/CrossPointWebServer.cpp/.h`
- MD5 Utils: `src/util/Md5Utils.cpp/.h`
- Docs: `docs/webserver-api-reference.md`, `docs/companion-app-deep-link-API.md`
---
### 9. Reading Lists with Pinning
Create and manage custom book lists with pinning support.
**Features:**
- Create, load, delete lists
- Pin a list to show on home screen
- List contents displayed with book metadata
- Web API for list upload/download (CSV format)
**Storage:**
- Lists stored in `/.lists/` as `.bin` files
- CSV format for API: `order,title,author,path`
**Configuration:**
- Library → Lists tab → Long-press → Pin/Unpin
- Pinned list name shown on home screen Lists button
**Technical Implementation:**
- Files: `src/BookListStore.cpp/.h`
- Pinned list stored in `SETTINGS.pinnedListName`
---
### 10. Display Enhancements
#### High Contrast Mode
System-wide display contrast adjustment for improved readability.
- **Normal mode:** Standard grayscale thresholds
- **High contrast mode:** Pushes mid-grays toward black/white
**Configuration:**
- Settings → Display → High Contrast → On/Off
#### Bezel Compensation
Compensate for physical screen edge defects with configurable margin.
- **Range:** 0-10 pixels
- **Edges:** Bottom, Top, Left, Right
- **Behavior:** Margin rotates with screen orientation
**Configuration:**
- Settings → Display → Bezel Compensation → [0-10]
- Settings → Display → Bezel Edge → [Bottom/Top/Left/Right]
#### Sleep Screen Improvements
Enhanced sleep screen with edge-aware color filling.
- **Edge luminance detection:** Samples edge pixels for dominant color
- **Letterbox fill:** Fills letterbox regions with edge colors for seamless appearance
- **Two-level caching:**
- Per-BMP cache: `.bmp.perim` files store edge luminance
- Book-level cache: `edge.bin` stores cover data
---
### 11. Recents View Improvements
Enhanced recent books display with metadata and management.
**Features:**
- **Badges:** Extension and suffix tags (e.g., "epub", "X4")
- **Metadata display:** Title and author from EPUB
- **Remove from recents:** Long-press → Remove from Recents
- **Clear all:** Long-press → Clear All Recents
**Badge Configuration:**
- Extension badges: `.epub` → "epub", `.txt` → "txt"
- Suffix badges: `-x4` → "X4", `-x4p` → "X4P"
**Technical Implementation:**
- Files: `src/RecentBooksStore.cpp/.h`
- Badge config: `src/BadgeConfig.h`
- String utils: `src/util/StringUtils.cpp/.h`
---
### 12. Enhanced Tab Bar
Unified tab bar with scrolling and overflow indicators.
**Features:**
- Horizontal scrolling when tabs exceed available width
- Overflow indicators (< >) when content extends beyond view
- Selected tab highlighting with underline
- Bullet cursors for focus mode
**Tabs:**
- Recent, Lists, Bookmarks, Search, Files
**Technical Implementation:**
- Files: `src/ScreenComponents.cpp/.h`
- Used in `MyLibraryActivity` for library navigation
---
### 13. Progress Bar Status Bar
Additional status bar option showing visual progress bar.
**Options:**
- `Full w/ Progress Bar` - Full status bar with progress bar
- `Progress Bar` - Only progress bar, no other status info
**Configuration:**
- Settings → Display → Status Bar
---
### 14. Additional Settings
New configuration options unique to crosspoint-ef:
| Setting | Options | Description |
|---------|---------|-------------|
| Short Power Button Click | Ignore, Sleep, Page Turn, Dictionary, Quick Menu | Map power button to action |
| Bezel Compensation | 0-10 pixels | Edge defect compensation |
| Bezel Edge | Bottom, Top, Left, Right | Which edge to compensate |
| High Contrast | Off, On | System-wide contrast boost |
| Custom Font | [Font list] | Select custom font |
| Fallback Font | Bookerly, Noto Sans | Fallback for custom fonts |
---
### 15. OPDS Browser Enhancements
Improved OPDS catalog browsing experience.
**Features:**
- **Navigation history stack** - Back button navigates through visited feeds
- **Page skipping** - Hold Up/Down for 700ms to skip 23 items at once
- **Error retry mechanism** - Retry button on error screens with WiFi status check
- **HTTP Basic Authentication** - Username/password support for protected OPDS servers
**Configuration:**
- Settings → System → Calibre Settings → OPDS Server URL
- Settings → System → Calibre Settings → Username/Password
**Technical Implementation:**
- Files: `src/activities/browser/OpdsBookBrowserActivity.cpp`
- Authentication: `src/network/HttpDownloader.cpp`
---
### 16. Development Tools
Scripts and utilities for firmware development.
**Scripts:**
| Script | Purpose |
|--------|---------|
| `pre_flash.py` | Displays "Flashing firmware..." screen during upload |
| `debugging_monitor.py` | Enhanced serial monitor with memory graphs and color output |
| `pio_helper.py` | Interactive PlatformIO workflow helper with presets |
| `version_hash.py` | Embeds git commit hash in dev builds |
| `build_html.py` | Minifies HTML files for web server |
**Firmware Flashing Screen:**
- Full-screen display during firmware upload
- Shows "Flashing firmware..." with version info
- Lock icon indicates USB port location
- Prevents accidental disconnection
**Debug/Memory Monitoring:**
- `DEBUG_MEMORY` build mode for heap tracking at activity transitions
- Periodic memory logging every 10 seconds (when Serial connected)
- Loop duration warnings when exceeding 50ms
- Detailed heap fragmentation info
**Technical Implementation:**
- Scripts: `scripts/pre_flash.py`, `scripts/debugging_monitor.py`, `scripts/pio_helper.py`
- Flash screen: `src/main.cpp` (lines 138-247)
- Memory monitoring: `src/main.cpp` (lines 549-562)
- Build config: `platformio.ini` (`debug_memory` environment)
---
### 17. Power Management Enhancements
Optimizations for battery life and responsiveness.
**Features:**
- **Auto-sleep prevention** - Background tasks (web server, OTA, downloads) prevent auto-sleep
- **USB connection detection** - Serial only starts when USB is connected (saves power)
- **Skip loop delay** - Activities can request faster loop execution for responsive HTTP handling
- **Power button release wait** - Prevents immediate wake if button is still held
**Technical Implementation:**
- Files: `src/main.cpp`, `src/activities/Activity.h`
- Methods: `preventAutoSleep()`, `skipLoopDelay()`
---
## Bug Fixes
### Unique to crosspoint-ef
1. **Grayscale state corruption fix** - Prevents ghosting and gray filter artifacts when anti-aliasing is enabled under memory pressure
2. **Memory optimization** - Graceful degradation when memory is low (skip anti-aliasing instead of corrupting display)
### Shared with 0.16.0
- Large EPUB indexing optimization (O(n²) → O(n))
- Settings validation on read
- Line break fixes (flush word before `<br/>`)
- Rotate origin in `drawImage()`
- Short-press power button to wakeup
- Add txt books to recent tab
- B&W filters for cover images
---
## Missing or Removed Features from 0.16.0
The following features are present in the upstream `0.16.0` release but are missing or were removed in `crosspoint-ef`:
### Removed Features
#### 1. KOReader Sync Support (Removed)
The entire KOReader sync functionality has been removed.
**What was removed:**
- `lib/KOReaderSync/` library (8 files deleted)
- Progress sync with KOReader sync server (`sync.koreader.rocks`)
- Document MD5 binary matching for progress synchronization
- KOReader credential storage
**Impact:**
- Cannot sync reading progress with KOReader app
- Chapter Selection UI fixes for KOReader sync (#501) not applicable
**Files deleted:**
- `KOReaderSyncClient.cpp/.h`
- `KOReaderCredentialStore.cpp/.h`
- `KOReaderDocumentId.cpp/.h`
- `ProgressMapper.cpp/.h`
---
#### 2. Non-English Hyphenation Patterns (Removed)
Hyphenation pattern files for non-English languages have been removed.
**What was removed:**
- `hyph-es.trie.h` - Spanish hyphenation
- `hyph-de.trie.h` - German hyphenation
- `hyph-fr.trie.h` - French hyphenation
- `hyph-ru.trie.h` - Russian hyphenation
**Impact:**
- Only English hyphenation patterns remain
- Non-English books will not hyphenate correctly
- Spanish hyphenation support (#558) not available
**Note:** These can be restored by copying the trie files from 0.16.0.
---
#### 3. XTC/XTCH File Support (Removed)
Support for the XTC/XTCH proprietary format has been removed.
**What was removed:**
- Author extraction from XTC/XTCH files (#563)
- XTC format handling in file browsers
**Impact:**
- XTC/XTCH files cannot be read
- Author metadata not extracted from these formats
---
### Missing Bug Fixes
The following bug fixes from 0.16.0 have not been applied to crosspoint-ef:
| PR | Description | Impact |
|----|-------------|--------|
| #567 | Multi-line keyboard entry | Long text input truncated with "..." instead of wrapping |
| #569 | Italics on image alt text | Image alt placeholders don't render in italics |
| #564 | Front layout in mapLabels() | Button mapping may be incorrect in some layouts |
| #486 | Relative position on settings change | Reader may jump to different location when settings change |
| #501 | Chapter Selection UI (KOReader) | N/A - KOReader sync removed |
| #529 | KOReader MD5 binary matching | N/A - KOReader sync removed |
---
### Missing UX Enhancements
| PR | Description | Impact |
|----|-------------|--------|
| #451 | Page turn on button press | When long-press chapter skip is disabled, 0.16.0 allows page turn on button press; crosspoint-ef does not |
---
### Different Implementation: OTA Updates
The OTA update mechanism uses a different implementation:
| Aspect | crosspoint-ef | 0.16.0 |
|--------|---------------|--------|
| HTTP Client | Arduino `HTTPClient` | ESP-IDF `esp_http_client` |
| OTA Library | Arduino `Update` | ESP-IDF `esp_https_ota` |
| Memory Management | Standard | Improved with custom buffer handling |
**Impact:**
- Both implementations work, but 0.16.0's ESP-IDF approach may be more memory-efficient
- Consider evaluating 0.16.0's OTA rework (#509) for potential adoption
---
### Recommendation for Missing Features
**High Priority to Cherry-pick:**
1. Multi-line keyboard entry (#567) - Improves UX for long inputs
2. Front layout fix (#564) - Bug fix for button mapping
3. Relative position on settings change (#486) - Improves reader UX
**Medium Priority:**
4. Restore hyphenation patterns for non-English languages
5. Italics on image alt (#569) - Minor visual improvement
6. Page turn on button press (#451) - UX enhancement
**Evaluate:**
7. OTA rework (#509) - Compare implementations for memory benefits
8. KOReader sync - Restore if sync functionality is desired
---
## File Summary
| Feature | Primary Files |
|---------|---------------|
| Dictionary | `src/activities/dictionary/`, `lib/StarDict/` |
| Bookmarks | `src/BookmarkStore.*`, `src/activities/home/BookmarkListActivity.*` |
| Quick Menu | `src/activities/util/QuickMenuActivity.*` |
| Search | `src/activities/home/MyLibraryActivity.cpp` |
| CSS | `lib/Epub/Epub/css/` |
| Images | `lib/Epub/Epub/blocks/ImageBlock.*`, `lib/Epub/Epub/converters/` |
| Custom Fonts | `src/customFonts.cpp`, `lib/EpdFont/builtinFonts/custom/` |
| Web Server | `src/network/CrossPointWebServer.*`, `src/util/Md5Utils.*` |
| Lists | `src/BookListStore.*` |
| Settings | `src/CrossPointSettings.*` |
| Tab Bar | `src/ScreenComponents.*` |
| Recents | `src/RecentBooksStore.*`, `src/BadgeConfig.h` |
| OPDS Browser | `src/activities/browser/OpdsBookBrowserActivity.*` |
| Dev Tools | `scripts/pre_flash.py`, `scripts/debugging_monitor.py`, `scripts/pio_helper.py` |
| Power Management | `src/main.cpp`, `src/activities/Activity.h` |
---
## Version Information
- **Base version:** 0.15.0
- **Branch:** crosspoint-ef
- **Commits since divergence:** 90+
- **Files changed:** 250+

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# CrossPoint-EF User Guide Supplement
This guide covers the additional features available in the `crosspoint-ef` branch. For basic operation, refer to the main [User Guide](../USER_GUIDE.md).
## Table of Contents
- [Dictionary](#dictionary)
- [Bookmarks](#bookmarks)
- [Quick Menu](#quick-menu)
- [Library Search](#library-search)
- [Reading Lists](#reading-lists)
- [Display Settings](#display-settings)
- [Web Server Features](#web-server-features)
- [Custom Fonts](#custom-fonts)
- [Additional Settings](#additional-settings)
---
## Dictionary
The dictionary feature provides offline word lookup while reading.
### Setup
1. Download a StarDict dictionary (English-English dictionary provided as `dict-en-en.zip`)
2. Extract the dictionary files to `/dictionaries/dict-data/` on your SD card
3. You should have these files:
- `dict-data.ifo`
- `dict-data.idx`
- `dict-data.dict.dz`
- `dict-data.syn` (optional, for synonyms)
### Using the Dictionary
#### Method 1: Quick Menu
1. While reading, press the **Power** button briefly (requires Quick Menu to be configured)
2. Select **Dictionary** from the menu
3. Choose **Select from Screen** or **Enter a Word**
#### Method 2: Direct Power Button Access
1. Go to **Settings → Controls → Short Power Button Click**
2. Set to **Dictionary**
3. While reading, press the **Power** button briefly to open the dictionary
### Selecting a Word from the Page
1. Choose **Select from Screen** from the dictionary menu
2. The current page will display with word selection enabled
3. Use **Left/Right** to move between words
4. Use **Up/Down** to jump between lines
5. Press **Confirm** to look up the selected word
6. Press **Back** to cancel
### Viewing Definitions
- Definitions display with rich formatting (bold, italic, lists)
- Use **Left/Right** or **Volume Up/Down** to navigate between pages if the definition is long
- Press **Confirm** to search for another word
- Press **Back** to return to your book
---
## Bookmarks
Create and manage bookmarks within your books.
### Adding a Bookmark
#### Method 1: Quick Menu
1. Press the **Power** button briefly (requires Quick Menu to be configured)
2. Select **Add Bookmark** (or **Remove Bookmark** if already bookmarked)
#### Method 2: Settings Configuration
1. Go to **Settings → Controls → Short Power Button Click**
2. Set to **Quick Menu**
3. Use Quick Menu to toggle bookmarks
### Bookmark Indicator
When a page is bookmarked, a small folded corner triangle appears in the top-right corner of the page.
### Viewing Bookmarks
1. Go to **Home → Library**
2. Select the **Bookmarks** tab
3. You'll see a list of books that have bookmarks
4. Select a book to view its bookmarks
5. Select a bookmark to jump to that location
### Deleting Bookmarks
1. Open a book's bookmark list (from Bookmarks tab)
2. Navigate to the bookmark you want to delete
3. **Long-press Confirm** (hold for about 1 second)
4. Confirm deletion when prompted
### Bookmark Naming
Bookmarks are automatically named based on:
- Chapter title and page number (e.g., "Chapter 3 - Page 42")
- Just page number if no chapter title (e.g., "Page 15")
---
## Quick Menu
Fast access to common actions while reading.
### Enabling Quick Menu
1. Go to **Settings → Controls → Short Power Button Click**
2. Select **Quick Menu**
### Using Quick Menu
1. While reading, press the **Power** button briefly
2. Navigate with **Up/Down** or **Left/Right**
3. Press **Confirm** to select an option
4. Press **Back** to close the menu
### Quick Menu Options
| Option | Description |
|--------|-------------|
| **Dictionary** | Look up a word |
| **Add/Remove Bookmark** | Toggle bookmark on current page |
| **Clear Cache** | Free up storage space |
| **Settings** | Open settings menu |
---
## Library Search
Search your library by title, author, or filename.
### Accessing Search
1. Go to **Home → Library**
2. Select the **Search** tab
3. Or from any tab, scroll to the bottom and select **Search...**
### Using the Character Picker
The search uses a character picker interface:
1. **Left/Right** - Move between characters
2. **Confirm** - Add character to search query
3. **SPC** - Add a space
4. **←** - Delete last character (backspace)
5. **CLR** - Clear entire query
### Navigating Results
1. After entering characters, results appear below
2. Press **Down** to move from character picker to results
3. **Left/Right** to navigate results
4. **Confirm** to open a book
5. **Up** to return to character picker
### Search Scoring
Results are ranked by relevance:
- Title matches rank highest
- Author matches rank second
- Filename matches rank lowest
- Matches at the start of a field rank higher
---
## Reading Lists
Create custom book lists for organizing your library.
### Viewing Lists
1. Go to **Home → Library**
2. Select the **Lists** tab
3. Available lists are displayed
### Opening a List
1. Navigate to a list name
2. Press **Confirm** to view the list contents
3. Select a book to start reading
### Pinning a List
Pin a list to quickly access it from the home screen:
1. In the Lists tab, navigate to a list
2. **Long-press Confirm** to open the action menu
3. Select **Pin List**
The pinned list name will appear on the Lists button on the home screen.
### Unpinning a List
1. Navigate to the pinned list
2. **Long-press Confirm**
3. Select **Unpin List**
### Deleting a List
1. Navigate to a list
2. **Long-press Confirm**
3. Select **Delete List**
4. Confirm deletion
### Creating Lists via Web Server
Lists can be created and uploaded via the web server API. See [Web Server Features](#web-server-features).
---
## Display Settings
### High Contrast Mode
Increases contrast across the entire UI for better readability.
1. Go to **Settings → Display → High Contrast**
2. Set to **On** or **Off**
When enabled, mid-gray tones are pushed toward black or white.
### Bezel Compensation
Compensate for physical screen edge defects (common on some devices).
1. Go to **Settings → Display → Bezel Compensation**
2. Set value from **0** (disabled) to **10** pixels
3. If compensation is enabled, select **Bezel Edge**:
- **Bottom** - Default, compensates bottom edge
- **Top** - Compensates top edge
- **Left** - Compensates left edge
- **Right** - Compensates right edge
The compensation margin automatically rotates with screen orientation.
### Status Bar Options
Additional status bar display options:
| Option | Description |
|--------|-------------|
| None | No status bar |
| No Progress | Status bar without reading progress |
| Full w/ Percentage | Status bar with percentage progress |
| Full w/ Progress Bar | Status bar with visual progress bar |
| Progress Bar | Only progress bar, no other info |
Configure at **Settings → Display → Status Bar**.
### Sleep Screen Cover Filter
When using book cover as sleep screen:
| Filter | Effect |
|--------|--------|
| None | Grayscale image as-is |
| Contrast | Black and white only (no grays) |
| Inverted | Inverted black and white |
Configure at **Settings → Display → Sleep Screen Cover Filter**.
---
## Web Server Features
The web server provides extended file management and companion app support.
### Starting the Web Server
1. Go to **Home → File Transfer**
2. Select a WiFi network or create a hotspot
3. The web server URL will be displayed
### File Management
Access the file manager at `http://<device-ip>/files`
**Available Operations:**
- **Upload** - Upload files via drag-and-drop or file picker
- **Download** - Download files to your computer
- **Delete** - Remove files and folders
- **Rename** - Rename files and folders
- **Create Folder** - Create new directories
- **Archive/Unarchive** - Archive books (preserves reading progress)
- **Copy/Move** - Copy or move files and folders
### API Access
The web server provides a JSON API for programmatic access:
| Endpoint | Description |
|----------|-------------|
| `GET /api/status` | Device status |
| `GET /api/files?path=/` | List files |
| `GET /api/archived` | List archived books |
| `GET /api/hash?path=/book.epub` | Get MD5 hash |
### mDNS Discovery
The device advertises itself as `crosspoint.local` on your network.
### Companion App Support
The web server supports the CrossPoint Companion Android app:
1. **QR Code** - Scan the QR code displayed on the web server screen
2. **Deep Links** - URLs like `crosspoint://files?host=192.168.1.100` open the app directly
### Managing Reading Lists via API
**Get all lists:**
```
GET /list
```
**Get specific list:**
```
GET /list?name=MyList
```
**Upload a list:**
```
POST /list?action=upload&name=MyList
Content-Type: text/plain
1,Book Title,Author Name,/path/to/book.epub
2,Another Book,Another Author,/path/to/another.epub
```
**Delete a list:**
```
POST /list?action=delete&name=MyList
```
---
## Custom Fonts
Two additional accessibility-focused fonts are available.
### Available Custom Fonts
1. **Atkinson Hyperlegible Next** - Designed for low-vision readers with high character differentiation
2. **Fern Micro** - Optimized for small screens
### Enabling Custom Fonts
1. Go to **Settings → Reader → Font Family**
2. Select **Custom**
3. Go to **Settings → Reader → Custom Font**
4. Select your preferred font
### Fallback Font
When using custom fonts, set a fallback for missing glyphs:
1. Go to **Settings → Reader → Fallback Font**
2. Choose **Bookerly** or **Noto Sans**
---
## Additional Settings
### Short Power Button Actions
Configure what happens when you briefly press the Power button:
| Option | Action |
|--------|--------|
| Ignore | No action (default) |
| Sleep | Put device to sleep |
| Page Turn | Turn to next page |
| Dictionary | Open dictionary |
| Quick Menu | Open quick menu |
Configure at **Settings → Controls → Short Power Button Click**.
### Long-press Chapter Skip
Control side button long-press behavior:
- **On** (default) - Long-press Volume buttons to skip chapters
- **Off** - Long-press scrolls a page instead
Configure at **Settings → Controls → Long-press Chapter Skip**.
### Hyphenation
Enable word hyphenation for justified text:
1. Go to **Settings → Reader → Hyphenation**
2. Set to **On**
Hyphenation patterns are available for multiple languages (English, German, French, Spanish, Russian, etc.).
---
## Recents View Enhancements
### Badges
Books in the Recent tab display badges showing:
- **File extension** (epub, txt, md)
- **Suffix tags** (X4, X4P for files with `-x4` or `-x4p` suffixes)
### Removing from Recents
1. Navigate to a book in the Recent tab
2. **Long-press Confirm**
3. Select **Remove from Recents**
### Clearing All Recents
1. Navigate to any book in the Recent tab
2. **Long-press Confirm**
3. Select **Clear All Recents**
4. Confirm the action
---
## Tab Navigation
The library uses a unified tab bar for navigation.
### Tabs Available
| Tab | Contents |
|-----|----------|
| Recent | Recently opened books |
| Lists | Custom reading lists |
| Bookmarks | Books with bookmarks |
| Search | Search all books |
| Files | File browser |
### Navigating Tabs
When the tab bar is focused:
- **Left/Right** - Switch between tabs
- **Down** - Enter the selected tab's content
- **Confirm** - Same as Down
### Tab Overflow
When tabs don't fit on screen:
- **<** indicator appears on left when more tabs exist to the left
- **>** indicator appears on right when more tabs exist to the right
- Scroll continues automatically when navigating past visible tabs
---
## Inline Images
EPUBs with embedded images now display them inline with text.
### Supported Formats
- JPEG (.jpg, .jpeg)
- PNG (.png)
### Image Display
- Images are automatically scaled to fit the page width
- Images are converted to 4-level grayscale with dithering
- First load may be slower as images are processed
- Subsequent loads use cached versions
### Image Cache
Processed images are cached as `.pxc` files in the book's cache directory for faster loading.
---
## Troubleshooting
### Dictionary Not Working
1. Verify dictionary files are in `/dictionaries/dict-data/`
2. Check that all required files exist (.ifo, .idx, .dict.dz)
3. File names must match exactly (case-sensitive)
### Bookmarks Not Saving
1. Ensure SD card is not write-protected
2. Check available storage space
3. Bookmarks are saved per-book in `/.crosspoint/`
### Search Not Finding Books
1. Search only indexes books in the library
2. Ensure books have proper EPUB metadata
3. Try searching by filename if metadata is missing
### Images Not Displaying
1. Only PNG and JPEG formats are supported
2. Very large images may fail to load due to memory constraints
3. Check for sufficient free memory (multiple large books open may exhaust memory)
### Web Server Connection Issues
1. Ensure device and computer are on the same network
2. Try accessing via IP address instead of `crosspoint.local`
3. Check that firewall isn't blocking port 80
---
## Keyboard Shortcuts Summary
### In Reader
| Button | Action |
|--------|--------|
| Left/Volume Up | Previous page |
| Right/Volume Down | Next page |
| Left (hold) | Previous chapter |
| Right (hold) | Next chapter |
| Back | Return to library |
| Back (hold) | Return to home |
| Confirm | Open chapter selection |
| Power (brief) | Configured action (Quick Menu/Dictionary/Sleep/Page Turn) |
### In Quick Menu
| Button | Action |
|--------|--------|
| Up/Down/Left/Right | Navigate options |
| Confirm | Select option |
| Back | Close menu |
### In Word Selection
| Button | Action |
|--------|--------|
| Left/Right | Move between words |
| Up/Down | Move between lines |
| Confirm | Look up word |
| Back | Cancel |
### In Library Tabs
| Button | Action |
|--------|--------|
| Left/Right | Switch tabs (when tab bar focused) |
| Up/Down | Navigate within tab |
| Confirm | Select item / Enter tab |
| Confirm (hold) | Action menu |
| Back | Go back / Exit to home |