Merge "Move the QrCodeGenerator from Settings to SettingsLib for Wifi and BT" into tm-dev

        "SettingsLibSettingsTransition",

        "SettingsLibButtonPreference",

        "setupdesign",

        "zxing-core-1.7",

    ],

    // ANDROIDMK TRANSLATION ERROR: unsupported assignment to LOCAL_SHARED_JAVA_LIBRARIES

/*

 * 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);

    }

}