## Major Features
### 1. CJK UI Font System
- Implemented external font loading system for CJK characters
- Added Source Han Sans (思源黑体) as base font for UI rendering
- Support for multiple font sizes (20pt, 22pt, 24pt)
- Font selection UI for both reader and UI fonts
- Automatic fallback to built-in fonts when external fonts unavailable
- External UI font now renders ALL characters (including ASCII) for consistent style
- Proportional spacing for external fonts (variable width per character)
### 2. Complete I18N Implementation
- Added comprehensive internationalization system
- Support for English, Chinese Simplified, and Japanese
- Translated all UI strings across the entire application
- Language selection UI in settings with native language names
- English displayed as "English"
- Chinese displayed as "简体中文"
- Japanese displayed as "日本語"
- Dynamic language switching without restart
### 3. Bug Fixes
#### Rendering Race Conditions
- Fixed race condition where parent and child Activity rendering tasks run simultaneously
- Added 500ms delay in child Activity displayTaskLoop() to wait for parent rendering completion
- Unified displayTaskLoop() logic: `if (updateRequired && !subActivity)`
- Prevents duplicate RED RAM writes and incomplete screen refreshes
**Affected Activities:**
- CategorySettingsActivity: Unified displayTaskLoop check logic
- KOReaderSettingsActivity: Added 500ms delay before first render
- CalibreSettingsActivity: Added 500ms delay before first render
- FontSelectActivity: Added 500ms delay before first render
- ClearCacheActivity: Added 500ms delay and subActivity check
- LanguageSelectActivity: Added 500ms delay in displayTaskLoop (not onEnter)
#### Button Response Issues
- Fixed CrossPointWebServer exit button requiring long press
- Added MappedInputManager::update() method
- Call update() before wasPressed() in tight HTTP processing loop
- Button presses during loop are now properly detected
#### ClearCache Crash
- Fixed FreeRTOS mutex deadlock when exiting ClearCache activity
- Added isExiting flag to prevent operations during exit
- Added clearCacheTaskHandle tracking
- Wait for clearCache task completion before deleting mutex
#### External UI Font Rendering
- Fixed ASCII characters not using external UI font (was using built-in EPD font)
- Fixed character spacing too wide (now uses proportional spacing via getGlyphMetrics)
## Technical Details
**Files Added:**
- lib/ExternalFont/: External font loading system
- lib/I18n/: Internationalization system
- lib/GfxRenderer/cjk_ui_font*.h: Pre-rendered CJK font data
- scripts/generate_cjk_ui_font.py: Font generation script
- src/activities/settings/FontSelectActivity.*: Font selection UI
- src/activities/settings/LanguageSelectActivity.*: Language selection UI
- docs/cjk-fonts.md: CJK font documentation
- docs/i18n.md: I18N documentation
**Files Modified:**
- lib/GfxRenderer/: Added CJK font rendering support with proportional spacing
- src/activities/: I18N integration across all activities
- src/MappedInputManager.*: Added update() method
- src/CrossPointSettings.cpp: Added language and font settings
**Memory Usage:**
- Flash: 94.7% (6204434 bytes / 6553600 bytes)
- RAM: 66.4% (217556 bytes / 327680 bytes)
## Testing Notes
All rendering race conditions and button response issues have been fixed and tested.
ClearCache no longer crashes when exiting.
File transfer page now responds to short press on exit button.
External UI font now renders all characters with proper proportional spacing.
Language selection page displays language names in their native scripts.
Co-authored-by: Claude (Anthropic AI Assistant)
## More detailed documentation
* **What is the goal of this PR?**
Add more information about the exposed webserver.
* **What changes are included?**
Detailed documentation for the webserver endpoints
(`./docs/webserver-endpoints.md`)
Adding a table of content so it is easier to navigate directly to the
section you're interested on (Almost all `.md` files or at least all
those relevant)
## Additional Context
Not sure if this would get accepted but I thought it might be useful for
those trying to create separate apps that would sync files to the
device. It was at least to me trying to upload files using python as
stated
[here](https://github.com/crosspoint-reader/crosspoint-reader/discussions/434#discussioncomment-15545349)
---
### AI Usage
While CrossPoint doesn't have restrictions on AI tools in contributing,
please be transparent about their usage as it
helps set the right context for reviewers.
Did you use AI tools to help write this code? _**PARTIALLY**_
## Summary
* Adds (optional) Hyphenation for English, French, German, Russian
languages
## Additional Context
* Included hyphenation dictionaries add approximately 280kb to the flash
usage (German alone takes 200kb)
* Trie encoded dictionaries are adopted from hypher project
(https://github.com/typst/hypher)
* Soft hyphens (and other explicit hyphens) take precedence over
dict-based hyphenation. Overall, the hyphenation rules are quite
aggressive, as I believe it makes more sense on our smaller screen.
---------
Co-authored-by: Dave Allie <dave@daveallie.com>
## Summary
* Replace book and section bin format images with ImHex hexpat
definition
* This should give readers an understanding of the file format but also
supply some utility when validating content/output
## Summary
* Consolidate chapter page data into single file
* Header structure of the file stays the same, following the page count,
we now put a LUT offset
* The page data is all then appended to this file
* Finally the LUT is appended to the end of the file, and the page count
is updated
* This will also significantly improve the duration of cache cleanup
which takes a while to scan the directory and cleanup content
* Remove page file version as it's all tied up into the section file now
* Bumped section file version to 7
* Moved section content into sub directory
* Updated docs
## Additional Context
* Benchmarks:
* Generating 74 pages of content from a chapter in Jade Legacy took:
* master: 6,229ms
* this PR: 1,305ms
* Speedup of 79%
* Generating 207 pages of content from Livesuit book:
* With progress bar UI updates:
* master: 24,250ms
* this PR: 8,063ms
* Speedup of 67%
* Without progress bar UI updates:
* master: 13,055ms
* this PR: 3,600ms
* Speedup of 72%
## Summary
- **What is the goal of this PR?**
Implements wireless EPUB file management via a built-in web server,
enabling users to upload, browse, organize, and delete EPUB files from
any device on the same WiFi network without needing a computer cable
connection.
- **What changes are included?**
- **New Web Server**
([`CrossPointWebServer.cpp`](src/CrossPointWebServer.cpp),
[`CrossPointWebServer.h`](src/CrossPointWebServer.h)):
- HTTP server on port 80 with a responsive HTML/CSS interface
- Home page showing device status (version, IP, free memory)
- File Manager with folder navigation and breadcrumb support
- EPUB file upload with progress tracking
- Folder creation and file/folder deletion
- XSS protection via HTML escaping
- Hidden system folders (`.` prefixed, "System Volume Information",
"XTCache")
- **WiFi Screen** ([`WifiScreen.cpp`](src/screens/WifiScreen.cpp),
[`WifiScreen.h`](src/screens/WifiScreen.h)):
- Network scanning with signal strength indicators
- Visual indicators for encrypted (`*`) and saved (`+`) networks
- State machine managing: scanning, network selection, password entry,
connecting, save/forget prompts
- 15-second connection timeout handling
- Integration with web server (starts on connect, stops on exit)
- **WiFi Credential Storage**
([`WifiCredentialStore.cpp`](src/WifiCredentialStore.cpp),
[`WifiCredentialStore.h`](src/WifiCredentialStore.h)):
- Persistent storage in `/sd/.crosspoint/wifi.bin`
- XOR obfuscation for stored passwords (basic protection against casual
reading)
- Up to 8 saved networks with add/remove/update operations
- **On-Screen Keyboard**
([`OnScreenKeyboard.cpp`](src/screens/OnScreenKeyboard.cpp),
[`OnScreenKeyboard.h`](src/screens/OnScreenKeyboard.h)):
- Reusable QWERTY keyboard component with shift support
- Special keys: Shift, Space, Backspace, Done
- Support for password masking mode
- **Settings Screen Integration**
([`SettingsScreen.h`](src/screens/SettingsScreen.h)):
- Added WiFi action to navigate to the new WiFi screen
- **Documentation** ([`docs/webserver.md`](docs/webserver.md)):
- Comprehensive user guide covering WiFi setup, web interface usage,
file management, troubleshooting, and security notes
- See this for more screenshots!
- Working "displays the right way in GitHub" on my repo:
https://github.com/olearycrew/crosspoint-reader/blob/feature/connect-to-wifi/docs/webserver.md
**Video demo**
https://github.com/user-attachments/assets/283e32dc-2d9f-4ae2-848e-01f41166a731
## Additional Context
- **Security considerations**: The web server has no
authentication—anyone on the same WiFi network can access files. This is
documented as a limitation, recommending use only on trusted private
networks. Password obfuscation in the credential store is XOR-based, not
cryptographically secure.
- **Memory implications**: The web server and WiFi stack consume
significant memory. The implementation properly cleans up (stops server,
disconnects WiFi, sets `WIFI_OFF` mode) when exiting the WiFi screen to
free resources.
- **Async operations**: Network scanning and connection use async
patterns with FreeRTOS tasks to prevent blocking the UI. The display
task handles rendering on a dedicated thread with mutex protection.
- **Browser compatibility**: The web interface uses standard
HTML5/CSS3/JavaScript and is tested to work with all modern browsers on
desktop and mobile.
---------
Co-authored-by: Dave Allie <dave@daveallie.com>
