96 lines
3.3 KiB
Java
96 lines
3.3 KiB
Java
/*
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* Copyright (C) 2017 Schürmann & Breitmoser GbR
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.sufficientlysecure.keychain.ui.util;
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import android.graphics.Bitmap;
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import android.graphics.Color;
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import android.net.Uri;
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import com.google.zxing.BarcodeFormat;
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import com.google.zxing.EncodeHintType;
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import com.google.zxing.WriterException;
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import com.google.zxing.common.BitMatrix;
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import com.google.zxing.qrcode.QRCodeWriter;
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import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
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import org.sufficientlysecure.keychain.KeychainApplication;
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import timber.log.Timber;
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import java.util.Hashtable;
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import java.util.Locale;
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/**
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* Copied from Bitcoin Wallet
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*/
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public class QrCodeUtils {
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public static Bitmap getQRCodeBitmap(final Uri uri) {
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return getQRCodeBitmap(uri.toString(), 0);
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}
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public static Bitmap getQRCodeBitmap(final Uri uri, final int size) {
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// for URIs we want alphanumeric encoding to save space, thus make everything upper case!
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// zxing will then select Mode.ALPHANUMERIC internally
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return getQRCodeBitmap(uri.toString().toUpperCase(Locale.ENGLISH), size);
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}
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/**
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* Generate Bitmap with QR Code based on input.
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* @return QR Code as Bitmap
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*/
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private static Bitmap getQRCodeBitmap(final String input, final int size) {
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try {
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// the qrCodeCache is handled in KeychainApplication so we can
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// properly react to onTrimMemory calls
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Bitmap bitmap = KeychainApplication.qrCodeCache.get(input);
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if (bitmap == null) {
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Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
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hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
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BitMatrix result = new QRCodeWriter().encode(input, BarcodeFormat.QR_CODE, size,
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size, hints);
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int width = result.getWidth();
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int height = result.getHeight();
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int[] pixels = new int[width * height];
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for (int y = 0; y < height; y++) {
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final int offset = y * width;
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for (int x = 0; x < width; x++) {
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pixels[offset + x] = result.get(x, y) ? Color.BLACK : Color.TRANSPARENT;
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}
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}
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bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
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bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
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KeychainApplication.qrCodeCache.put(input, bitmap);
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}
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return bitmap;
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} catch (WriterException e) {
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Timber.e(e, "QrCodeUtils");
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return null;
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}
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}
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}
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