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feat: Initial commit — libswipetype v0.1.0-dev 
Complete swipe typing engine with:
- swipetype-core: C++17 gesture recognition (DTW, adaptive scoring)
- swipetype-android: JNI bridge + Android AAR packaging
- sample-app: Functional IME demo with space bar zone detection
- 48 unit tests (GTest), CI/CD workflows (GitHub Actions)
- Full documentation suite (architecture, API, contributing, security)

Co-authored-by: inventory69 <inventory69@users.noreply.github.com>
Co-authored-by: Hyphonical <Hyphonical@users.noreply.github.com>
2026-02-26 23:02:03 +01:00

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Changelog

All notable changes to libswipetype are documented in this file.

The format is based on Keep a Changelog.

[0.1.0-dev] — 2026-02-26

Initial release — Phases 1–11 complete.

Added

  • swipetype-core — C++17 gesture recognition library

    • PathProcessor — deduplicate, resample (64 points), bounding-box normalize
    • IdealPathGenerator — reference path generation with caching
    • Scorer — DTW distance with Sakoe-Chiba band (W=6)
    • DictionaryLoader — binary .glide format reader
    • GestureEngine — recognition pipeline orchestrator
    • AdjacencyMap — key adjacency computation (unused in scoring, for future use)
    • 48 Google Test unit tests (all passing)

  • swipetype-android — Android AAR module

    • SwipeTypeEngine — Java lifecycle manager
    • SwipeTypeAdapter — keyboard integration interface
    • GesturePoint, KeyboardLayoutDescriptor, SwipeTypeCandidate, SwipeTypeError — data types
    • GestureLibJNI.cpp — JNI bridge

  • adapters/heliboard — reference adapter for HeliBoard keyboard

    • HeliboardSwipeTypeAdapter — translates HeliBoard's ProximityInfo/InputPointers to swipetype API

  • sample-app — minimal Input Method Service demo

    • SampleKeyboardView — custom QWERTY keyboard renderer with gesture trail
    • SampleInputMethodService — IME integration using SwipeTypeAdapter
    • MainActivity — setup guide with IME enable/switch buttons

  • scripts/gen_dict.py — TSV-to-.glide dictionary generator

  • test-data/ — 302-word English dictionary, QWERTY layout JSON, gesture scenarios

  • Documentation (Phase 9)

    • docs/API.md — full C++ and Java API reference
    • docs/ARCHITECTURE.md — system architecture, pipeline diagram, design decisions
    • docs/ONBOARDING.md — developer onboarding guide (build, test, run)
    • docs/HOW_TO_WRITE_AN_ADAPTER.md — step-by-step adapter integration guide
    • CHANGELOG.md (this file)

  • Sample App Theme Fix (Phase 10)

    • styles.xml with AppTheme and SwipeTypeImeTheme
    • Transparent window background prevents system theme bleed-through

  • Structural Accuracy Fixes (Phase 11) — 3 algorithmic improvements

    • Key-transition word length estimation (replaced arc-length heuristic)
    • Absolute DTW normalization floor for single-candidate sets
    • Adaptive frequency weight: effectiveAlpha *= max(0.1, rawRange/0.5)
    • 3 new regression tests

  • CI/CD — GitHub Actions workflows

    • ci.yml — Core C++ tests, Android build, NDK ABI matrix (arm64, armv7, x86_64)
    • release.yml — tag-triggered AAR release

Fixed (Phase 8 — BUG-1 through BUG-6)

  • BUG-1: Dictionary loading moved from onInit() callback to onCreate() (eliminated infinite loop)
  • BUG-2: Keyboard layout now uses even key distribution
  • BUG-3: Dark theme with explicit colors (hardcoded in SampleKeyboardView)
  • BUG-4: maxDTWFloor = 3.0 for single-candidate normalization
  • BUG-5: Frequency weight set to α = 0.30 to balance shape vs. frequency
  • BUG-6: Dictionary expanded from 10 to 302 words
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