function CVContextData() {
  this.saved = [];
  this.cArrPos = 0;
  this.cTr = new Matrix();
  this.cO = 1;
  var i,
    len = 15;
  this.savedOp = createTypedArray('float32', len);
  for (i = 0; i < len; i += 1) {
    this.saved[i] = createTypedArray('float32', 16);
  }
  this._length = len;
}

CVContextData.prototype.duplicate = function () {
  var newLength = this._length * 2;
  var currentSavedOp = this.savedOp;
  this.savedOp = createTypedArray('float32', newLength);
  this.savedOp.set(currentSavedOp);
  var i = 0;
  for (i = this._length; i < newLength; i += 1) {
    this.saved[i] = createTypedArray('float32', 16);
  }
  this._length = newLength;
};

CVContextData.prototype.reset = function () {
  this.cArrPos = 0;
  this.cTr.reset();
  this.cO = 1;
};