From db1e3583cf4e64aad01df202d6ab11792b62c208 Mon Sep 17 00:00:00 2001
From: changbetty <changbetty@google.com>
Date: Wed, 23 Mar 2022 09:40:16 +0000
Subject: [PATCH] Move the QrCodeGenerator from Settings to SettingsLib for
 Wifi and BT

Bug: 214338905
Test: Manual test
Change-Id: I51151d71b89a92fe6880a00ead490adeb14f20bb
---
 packages/SettingsLib/Android.bp               |  1 +
 .../settingslib/qrcode/QrCodeGenerator.java   | 63 +++++++++++++++++++
 2 files changed, 64 insertions(+)
 create mode 100644 packages/SettingsLib/src/com/android/settingslib/qrcode/QrCodeGenerator.java

diff --git a/packages/SettingsLib/Android.bp b/packages/SettingsLib/Android.bp
index 1b7298a332ded..9a80b02679763 100644
--- a/packages/SettingsLib/Android.bp
+++ b/packages/SettingsLib/Android.bp
@@ -51,6 +51,7 @@ android_library {
         "SettingsLibSettingsTransition",
         "SettingsLibButtonPreference",
         "setupdesign",
+        "zxing-core-1.7",
     ],
 
     // ANDROIDMK TRANSLATION ERROR: unsupported assignment to LOCAL_SHARED_JAVA_LIBRARIES
diff --git a/packages/SettingsLib/src/com/android/settingslib/qrcode/QrCodeGenerator.java b/packages/SettingsLib/src/com/android/settingslib/qrcode/QrCodeGenerator.java
new file mode 100644
index 0000000000000..bc5824a4758da
--- /dev/null
+++ b/packages/SettingsLib/src/com/android/settingslib/qrcode/QrCodeGenerator.java
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * 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.android.settingslib.qrcode;
+
+import android.graphics.Bitmap;
+import android.graphics.Color;
+
+import com.google.zxing.BarcodeFormat;
+import com.google.zxing.EncodeHintType;
+import com.google.zxing.MultiFormatWriter;
+import com.google.zxing.WriterException;
+import com.google.zxing.common.BitMatrix;
+
+import java.nio.charset.CharsetEncoder;
+import java.nio.charset.StandardCharsets;
+import java.util.HashMap;
+import java.util.Map;
+
+public final class QrCodeGenerator {
+    /**
+     * Generates a barcode image with {@code contents}.
+     *
+     * @param contents The contents to encode in the barcode
+     * @param size     The preferred image size in pixels
+     * @return Barcode bitmap
+     */
+    public static Bitmap encodeQrCode(String contents, int size)
+            throws WriterException, IllegalArgumentException {
+        final Map<EncodeHintType, Object> hints = new HashMap<>();
+        if (!isIso88591(contents)) {
+            hints.put(EncodeHintType.CHARACTER_SET, StandardCharsets.UTF_8.name());
+        }
+
+        final BitMatrix qrBits = new MultiFormatWriter().encode(contents, BarcodeFormat.QR_CODE,
+                size, size, hints);
+        final Bitmap bitmap = Bitmap.createBitmap(size, size, Bitmap.Config.RGB_565);
+        for (int x = 0; x < size; x++) {
+            for (int y = 0; y < size; y++) {
+                bitmap.setPixel(x, y, qrBits.get(x, y) ? Color.BLACK : Color.WHITE);
+            }
+        }
+        return bitmap;
+    }
+
+    private static boolean isIso88591(String contents) {
+        CharsetEncoder encoder = StandardCharsets.ISO_8859_1.newEncoder();
+        return encoder.canEncode(contents);
+    }
+}