Add parts of zxing library to generate qr codes

OpenPGP-Keychain/src/com/google/zxing/ResultPointCallback.java

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2009 ZXing authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.zxing;
+
+/**
+ * Callback which is invoked when a possible result point (significant
+ * point in the barcode image such as a corner) is found.
+ *
+ * @see DecodeHintType#NEED_RESULT_POINT_CALLBACK
+ */
+public interface ResultPointCallback {
+
+  void foundPossibleResultPoint(ResultPoint point);
+
+}