92 lines
3.0 KiB
C++
92 lines
3.0 KiB
C++
/*
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* Kaidan - A user-friendly XMPP client for every device!
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*
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* Copyright (C) 2016-2019 Kaidan developers and contributors
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* (see the LICENSE file for a full list of copyright authors)
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*
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* Kaidan 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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* In addition, as a special exception, the author of Kaidan gives
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* permission to link the code of its release with the OpenSSL
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* project's "OpenSSL" library (or with modified versions of it that
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* use the same license as the "OpenSSL" library), and distribute the
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* linked executables. You must obey the GNU General Public License in
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* all respects for all of the code used other than "OpenSSL". If you
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* modify this file, you may extend this exception to your version of
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* the file, but you are not obligated to do so. If you do not wish to
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* do so, delete this exception statement from your version.
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*
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* Kaidan 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 Kaidan. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "QrCodeDecoder.h"
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// Qt
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#include <QColor>
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#include <QImage>
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// ZXing-cpp
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#include <ZXing/BarcodeFormat.h>
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#include <ZXing/DecodeHints.h>
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#include <ZXing/GenericLuminanceSource.h>
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#include <ZXing/HybridBinarizer.h>
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#include <ZXing/LuminanceSource.h>
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#include <ZXing/MultiFormatReader.h>
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#include <ZXing/Result.h>
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#include <ZXing/TextUtfEncoding.h>
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using namespace ZXing;
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QrCodeDecoder::QrCodeDecoder(QObject *parent)
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: QObject(parent)
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{
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}
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void QrCodeDecoder::decodeImage(const QImage &image)
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{
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// options for decoding
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DecodeHints decodeHints;
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// Advise the decoder to also decode rotated QR codes.
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decodeHints.setShouldTryRotate(true);
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// Advise the decoder to only decode QR codes.
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std::vector<BarcodeFormat> allowedFormats;
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allowedFormats.emplace_back(BarcodeFormat::QR_CODE);
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decodeHints.setPossibleFormats(allowedFormats);
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MultiFormatReader reader(decodeHints);
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// Create an image source to be decoded later.
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GenericLuminanceSource source(
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image.width(),
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image.height(),
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image.bits(),
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image.width(),
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1,
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0,
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1,
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2
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);
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// Create an image source specific for decoding black data on white background.
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HybridBinarizer binImage(std::shared_ptr<LuminanceSource>(&source, [](void*) {}));
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// Decode the specific image source.
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auto result = reader.read(binImage);
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// If a QR code could be found and decoded, emit a signal with the decoded string.
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// Otherwise, emit a signal for failed decoding.
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if (result.isValid())
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emit decodingSucceeded(QString::fromStdString(TextUtfEncoding::ToUtf8(result.text())));
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else
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emit decodingFailed();
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}
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