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/*
* Copyright (C) 2013-2014 Dominik Schürmann <dominik@dominikschuermann.de>
* Copyright (C) 2011 Andreas Schildbach
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.sufficientlysecure.keychain.ui.util;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.net.Uri;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.KeychainApplication;
import org.sufficientlysecure.keychain.util.Log;
import java.util.Hashtable;
import java.util.Locale;
/**
* Copied from Bitcoin Wallet
*/
public class QrCodeUtils {
public static Bitmap getQRCodeBitmap(final Uri uri, final int size) {
// for URIs we want alphanumeric encoding to save space, thus make everything upper case!
// zxing will then select Mode.ALPHANUMERIC internally
return getQRCodeBitmap(uri.toString().toUpperCase(Locale.ENGLISH), size);
}
/**
* Generate Bitmap with QR Code based on input.
* @return QR Code as Bitmap
*/
private static Bitmap getQRCodeBitmap(final String input, final int size) {
try {
// the qrCodeCache is handled in KeychainApplication so we can
// properly react to onTrimMemory calls
Bitmap bitmap = KeychainApplication.qrCodeCache.get(input);
if (bitmap == null) {
Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
BitMatrix result = new QRCodeWriter().encode(input, BarcodeFormat.QR_CODE, size,
size, hints);
int width = result.getWidth();
int height = result.getHeight();
int[] pixels = new int[width * height];
for (int y = 0; y < height; y++) {
final int offset = y * width;
for (int x = 0; x < width; x++) {
pixels[offset + x] = result.get(x, y) ? Color.BLACK : Color.TRANSPARENT;
}
}
bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
KeychainApplication.qrCodeCache.put(input, bitmap);
}
return bitmap;
} catch (WriterException e) {
Log.e(Constants.TAG, "QrCodeUtils", e);
return null;
}
}
}
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