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gaia/apps/keyboard/js/imes/handwriting/hwr/recognition.js

@@ -0,0 +1,122 @@
+'use strict';
+
+var MAX_STROKE_NUM = 1000;
+
+self.onmessage = function(e) {
+  var data = e.data;
+
+  switch(data.id) {
+    case 'setLang':
+      var ret = Recognition.setLang(data.param);
+      post('setLang', ret);
+      break;
+    case 'recognize':
+      var words = Recognition.recognize(JSON.parse(data.param));
+      post('recognize', JSON.stringify(words));
+      break;
+    case 'getPrediction':
+      var words = Recognition.getPrediction(data.param);
+      post('getPrediction', words);
+      break;
+    default:
+      break;
+  }
+};
+
+var Recognition = {
+  _inited: false,
+
+  setLang: function(lang) {
+    if (!this._lang) {
+      this._lang = lang;
+      return this._init(lang);
+    }
+    if (this._lang != lang) {
+      this._lang = lang;
+      this._uinit();
+      return this._init(lang);
+    }
+    return true;
+  },
+
+  recognize: function(points) {
+    if (!this._inited) {
+      return [];
+    }
+
+    var strokes = points.slice(0, 2 * MAX_STROKE_NUM);
+    // Append [-1, -1] to strokes.
+    strokes.push.apply(strokes, [-1, -1]);
+    this._strokeBuffer.set(strokes);
+    return this._CharacterRecognize(this._strokeBuffer.byteOffset);
+  },
+
+  getPrediction: function(words) {
+    if (this._getPrediction) {
+      return this._getPrediction(words);
+    }
+  },
+
+  _init: function(lang) {
+    this._inited = false;
+    var model = '';
+
+    if (lang == 'zh-Hans') {
+      model = 'zh_Hans.model';
+    }
+    if (lang == 'zh-Hant') {
+      model = 'zh_Hant.model';
+    }
+
+    if (!Module.ccall('InitRecog',
+                      'number',
+                      ['string', 'number', 'number'],
+                      [model, 140, 140])) {
+      return false;
+    }
+
+    this._CharacterRecognize =
+      Module.cwrap('CharacterRecognize', 'string', ['number']);
+
+    if (Module.ccall('InitPrediction',
+                     'number',
+                     ['string'],
+                     ['dict_pinyin.data'])) {
+      this._getPrediction =
+        Module.cwrap('GetPrediction', 'string', ['string']);
+    }
+
+    var buf = Module._malloc((MAX_STROKE_NUM + 1) * 4);
+    this._strokeBuffer =
+      new Int16Array(Module.HEAPU8.buffer, buf, (MAX_STROKE_NUM + 1) * 2);
+
+    this._inited = true;
+    return true;
+  },
+
+  _uinit: function() {
+    Module._free(this._strokeBuffer.byteOffset);
+    Module.ccall('ExitRecog', '', [], []);
+  },
+
+  _strokeBuffer: null,
+  _CharacterRecognize: null,
+  _lang: '',
+  _getPrediction: null
+};
+
+var Module = {
+  filePackagePrefixURL: './',
+  canvas: {},
+  stdout: null,
+  _main: function() {
+    post('init', true);
+  }
+};
+
+function post(id, value) {
+  postMessage({
+    id: id,
+    value: value
+  });
+}