Merge pull request #426

93d2eb5 add qrcode scanner (MoroccanMalinois)

README.md

@@ -85,15 +85,15 @@ Packaging for your favorite distribution would be a welcome contribution!
 
   - For Ubuntu 16.04 i386
 
-	`sudo apt-get install qtbase5-dev qt5-default qtdeclarative5-dev qml-module-qtquick-controls qml-module-qtquick-xmllistmodel qttools5-dev-tools qml-module-qtquick-dialogs`
+	`sudo apt-get install qtbase5-dev qt5-default qtdeclarative5-dev qml-module-qtquick-controls qml-module-qtquick-xmllistmodel qttools5-dev-tools qml-module-qtquick-dialogs libzbar-dev`
 
   - For Ubuntu 16.04 x64
 
-     `sudo apt-get install qtbase5-dev qt5-default qtdeclarative5-dev qml-module-qtquick-controls qml-module-qtquick-xmllistmodel qttools5-dev-tools qml-module-qtquick-dialogs qml-module-qt-labs-settings libqt5qml-graphicaleffects`
+     `sudo apt-get install qtbase5-dev qt5-default qtdeclarative5-dev qml-module-qtquick-controls qml-module-qtquick-xmllistmodel qttools5-dev-tools qml-module-qtquick-dialogs qml-module-qt-labs-settings libqt5qml-graphicaleffects libzbar-dev`
 
   - For Linux Mint 18 "Sarah" - Cinnamon (64-bit)
 
-     `sudo apt install qml-module-qt-labs-settings qml-module-qtgraphicaleffects`
+     `sudo apt install qml-module-qt-labs-settings qml-module-qtgraphicaleffects libzbar-dev`
 
 6. Build the GUI.
 

build.sh

@@ -24,12 +24,12 @@ elif [ "$BUILD_TYPE" == "release-static" ]; then
     BIN_PATH=release/bin
 elif [ "$BUILD_TYPE" == "release-android" ]; then
     echo "Building release for ANDROID"
-    CONFIG="CONFIG+=release static";
+    CONFIG="CONFIG+=release static WITH_SCANNER";
     ANDROID=true
     BIN_PATH=release/bin
 elif [ "$BUILD_TYPE" == "debug-android" ]; then
     echo "Building debug for ANDROID : ultra INSECURE !!"
-    CONFIG="CONFIG+=debug qml_debug";
+    CONFIG="CONFIG+=debug qml_debug WITH_SCANNER";
     ANDROID=true
     BIN_PATH=debug/bin
 elif [ "$BUILD_TYPE" == "debug" ]; then

components/QRCodeScanner.qml

@@ -0,0 +1,134 @@
+// Copyright (c) 2014-2017, The Monero Project
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+import QtQuick 2.0
+import QtMultimedia 5.4
+import QtQuick.Dialogs 1.2
+import moneroComponents.QRCodeScanner 1.0
+
+Rectangle {
+    id : root
+
+    x: 0
+    y: 0
+    z: parent.z+1
+    width: parent.width
+    height: parent.height
+
+    visible: false
+    color: "black"
+    state: "Stopped"
+
+    signal qrcode_decoded(string address, string payment_id, string amount, string tx_description, string recipient_name)
+
+    states: [
+        State {
+            name: "Capture"
+            StateChangeScript {
+                script: {
+		    root.visible = true
+                    camera.captureMode = Camera.CaptureStillImage
+                    camera.start()
+                    finder.enabled = true
+                }
+            }
+        },
+        State {
+            name: "Stopped"
+            StateChangeScript {
+                script: {
+                    camera.stop()
+		    root.visible = false
+                    finder.enabled = false
+                }
+            }
+        }
+    ]
+
+    Camera {
+        id: camera
+        objectName: "qrCameraQML"
+        captureMode: Camera.CaptureStillImage
+
+        focus {
+            focusMode: Camera.FocusContinuous
+        }
+    }
+    QRCodeScanner {
+        id : finder
+        objectName: "QrFinder"
+        onDecoded : {
+            root.qrcode_decoded(address, payment_id, amount, tx_description, recipient_name)
+            root.state = "Stopped"
+	}
+        onNotifyError : {
+            if( warning )
+                messageDialog.icon = StandardIcon.Critical
+            else {
+                messageDialog.icon = StandardIcon.Warning
+                root.state = "Stopped"
+            }
+            messageDialog.text = error
+            messageDialog.visible = true
+        }
+    }
+
+    VideoOutput {
+        id: viewfinder
+        visible: root.state == "Capture"
+
+        x: 0
+        y: 0
+        z: parent.z+1
+        width: parent.width
+        height: parent.height
+
+        source: camera
+        autoOrientation: true
+
+        MouseArea {
+            anchors.fill: parent
+            propagateComposedEvents: true
+            onPressAndHold: {
+                if (camera.lockStatus == Camera.locked)camera.unlock()
+                camera.searchAndLock()
+            }
+            onDoubleClicked: {
+                root.state = "Stopped"
+            }
+        }
+    }
+
+    MessageDialog {
+        id: messageDialog
+        title: "Scanning QrCode"
+        onAccepted: {
+            root.state = "Stopped"
+        }
+    }
+}

main.cpp

@@ -39,6 +39,7 @@
 #include "WalletManager.h"
 #include "Wallet.h"
 #include "QRCodeImageProvider.h"
+#include "QrCodeScanner.h"
 #include "PendingTransaction.h"
 #include "UnsignedTransaction.h"
 #include "TranslationManager.h"
@@ -109,6 +110,8 @@ int main(int argc, char *argv[])
     qRegisterMetaType<TransactionInfo::Direction>();
     qRegisterMetaType<TransactionHistoryModel::TransactionInfoRole>();
 
+    qmlRegisterType<QrCodeScanner>("moneroComponents.QRCodeScanner", 1, 0, "QRCodeScanner");
+
     QQmlApplicationEngine engine;
 
     OSCursor cursor;
@@ -167,5 +170,15 @@ int main(int argc, char *argv[])
 
     //WalletManager::instance()->setLogLevel(WalletManager::LogLevel_Max);
 
+    bool builtWithScanner = false;
+#ifdef WITH_SCANNER
+    builtWithScanner = true;
+    QObject *qmlCamera = rootObject->findChild<QObject*>("qrCameraQML");
+    QCamera *camera_ = qvariant_cast<QCamera*>(qmlCamera->property("mediaObject"));
+    QObject *qmlFinder = rootObject->findChild<QObject*>("QrFinder");
+    qobject_cast<QrCodeScanner*>(qmlFinder)->setSource(camera_);
+#endif
+    engine.rootContext()->setContextProperty("builtWithScanner", builtWithScanner);
+
     return app.exec();
 }

main.qml

@@ -32,6 +32,7 @@ import QtQuick.Controls 1.1
 import QtQuick.Controls.Styles 1.1
 import QtQuick.Dialogs 1.2
 import Qt.labs.settings 1.0
+import QtMultimedia 5.4
 
 import moneroComponents.Wallet 1.0
 import moneroComponents.PendingTransaction 1.0
@@ -65,6 +66,7 @@ ApplicationWindow {
     property bool viewOnly: false
     property bool foundNewBlock: false
     property int timeToUnlock: 0
+    property bool qrScannerEnabled: builtWithScanner && (QtMultimedia.availableCameras.length > 0)
 
     // true if wallet ever synchronized
     property bool walletInitialized : false
@@ -876,7 +878,10 @@ ApplicationWindow {
         messageText: qsTr("Please wait...")
     }
 
-
+    QRCodeScanner {
+        id: cameraUi
+        visible : false
+    }
 
     Item {
         id: rootItem

monero-wallet-gui.pro

@@ -1,6 +1,6 @@
 TEMPLATE = app
 
-QT += qml quick widgets
+QT += qml quick widgets multimedia
 
 WALLET_ROOT=$$PWD/monero
 
@@ -12,6 +12,7 @@ QMAKE_DISTCLEAN += -r $$WALLET_ROOT
 INCLUDEPATH +=  $$WALLET_ROOT/include \
                 $$PWD/src/libwalletqt \
                 $$PWD/src/QR-Code-generator \
+                $$PWD/src/QR-Code-scanner \
                 $$PWD/src \
                 $$WALLET_ROOT/src
 
@@ -37,8 +38,8 @@ HEADERS += \
     src/model/AddressBookModel.h \
     src/libwalletqt/AddressBook.h \
     src/zxcvbn-c/zxcvbn.h \
-    src/libwalletqt/UnsignedTransaction.h
+    src/libwalletqt/UnsignedTransaction.h \
-
+    src/QR-Code-scanner/QrCodeScanner.h 
 
 SOURCES += main.cpp \
     filter.cpp \
@@ -61,7 +62,8 @@ SOURCES += main.cpp \
     src/model/AddressBookModel.cpp \
     src/libwalletqt/AddressBook.cpp \
     src/zxcvbn-c/zxcvbn.c \
-    src/libwalletqt/UnsignedTransaction.cpp
+    src/libwalletqt/UnsignedTransaction.cpp \
+    src/QR-Code-scanner/QrCodeScanner.cpp 
 
 lupdate_only {
 SOURCES = *.qml \
@@ -76,6 +78,22 @@ LIBS += -L$$WALLET_ROOT/lib \
          $$WALLET_ROOT/build/release/contrib/epee/src/libepee.a \
         -lunbound
 
+CONFIG(WITH_SCANNER) {
+    if( greaterThan(QT_MINOR_VERSION, 5) ) {
+        message("using camera scanner")
+        DEFINES += "WITH_SCANNER"
+        HEADERS += src/QR-Code-scanner/QrScanThread.h
+        SOURCES += src/QR-Code-scanner/QrScanThread.cpp
+        android {
+            INCLUDEPATH += $$PWD/../ZBar/include
+            LIBS += -lzbarjni -liconv
+        } else {
+            LIBS += -lzbar
+        }
+    } else {
+        message("Skipping camera scanner because of Incompatible Qt Version !")
+    }
+}
 
 # currently we only support x86 build as qt.io only provides prebuilt qt for x86 mingw
 

pages/AddressBook.qml

@@ -62,12 +62,31 @@ Rectangle {
         tipText: qsTr("<b>Tip tekst test</b>") + translationManager.emptyString
     }
 
+    StandardButton {
+        id: qrfinderButton
+        anchors.left: parent.left
+        anchors.leftMargin: 17
+        anchors.topMargin: 5
+        anchors.top: addressLabel.bottom
+        text: qsTr("QRCODE") + translationManager.emptyString
+        shadowReleasedColor: "#FF4304"
+        shadowPressedColor: "#B32D00"
+        releasedColor: "#FF6C3C"
+        pressedColor: "#FF4304"
+        visible : appWindow.qrScannerEnabled
+        enabled : visible
+        width: visible ? 60 : 0
+        onClicked: {
+            cameraUi.state = "Capture"
+            cameraUi.qrcode_decoded.connect(updateFromQrCode)
+        }
+    }
+
     LineEdit {
         id: addressLine
-        anchors.left: parent.left
+        anchors.left: qrfinderButton.right
         anchors.right: parent.right
         anchors.top: addressLabel.bottom
-        anchors.leftMargin: 17
         anchors.rightMargin: 17
         anchors.topMargin: 5
         error: true;
@@ -275,5 +294,13 @@ Rectangle {
         root.model = currentWallet.addressBookModel;
     }
 
+    function updateFromQrCode(address, payment_id, amount, tx_description, recipient_name) {
+        console.log("updateFromQrCode")
+        addressLine.text = address
+        paymentIdLine.text = payment_id
+        //amountLine.text = amount
+        descriptionLine.text = recipient_name + " " + tx_description
+        cameraUi.qrcode_decoded.disconnect(updateFromQrCode)
+    }
 
 }

pages/Transfer.qml

@@ -77,6 +77,15 @@ Rectangle {
         privacyLabel.text = qsTr("Privacy level (mixin %1)").arg(mixin) + translationManager.emptyString
     }
 
+    function updateFromQrCode(address, payment_id, amount, tx_description, recipient_name) {
+        console.log("updateFromQrCode")
+        addressLine.text = address
+        paymentIdLine.text = payment_id
+        amountLine.text = amount
+        descriptionLine.text = recipient_name + " " + tx_description
+        cameraUi.qrcode_decoded.disconnect(updateFromQrCode)
+    }
+
     // Information dialog
     StandardDialog {
         // dynamically change onclose handler
@@ -249,11 +258,29 @@ Rectangle {
         anchors.right: parent.right
         anchors.top: addressLabel.bottom
 
+        StandardButton {
+            id: qrfinderButton
+            anchors.left: parent.left
+            anchors.leftMargin: 17
+            anchors.topMargin: 5
+            text: qsTr("QRCODE") + translationManager.emptyString
+            shadowReleasedColor: "#FF4304"
+            shadowPressedColor: "#B32D00"
+            releasedColor: "#FF6C3C"
+            pressedColor: "#FF4304"
+            visible : appWindow.qrScannerEnabled
+            enabled : visible
+            width: visible ? 60 : 0
+            onClicked: {
+                cameraUi.state = "Capture"
+                cameraUi.qrcode_decoded.connect(updateFromQrCode)
+            }
+        }
         LineEdit {
             id: addressLine
-            anchors.left: parent.left
+            anchors.left: qrfinderButton.right
             anchors.right: resolveButton.left
-            anchors.leftMargin: 17
+            //anchors.leftMargin: 17
             anchors.topMargin: 5
             placeholderText: "4..."
             // validator: RegExpValidator { regExp: /[0-9A-Fa-f]{95}/g }

qml.qrc

@@ -125,5 +125,6 @@
         <file>wizard/WizardPasswordUI.qml</file>
         <file>wizard/WizardCreateViewOnlyWallet.qml</file>
         <file>components/DaemonConsole.qml</file>
+        <file>components/QRCodeScanner.qml</file>
     </qresource>
 </RCC>

src/QR-Code-scanner/QrCodeScanner.cpp

@@ -0,0 +1,108 @@
+// Copyright (c) 2014-2017, The Monero Project
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "QrCodeScanner.h"
+#include <WalletManager.h>
+#include <QVideoProbe>
+#include <QCamera>
+
+QrCodeScanner::QrCodeScanner(QObject *parent)
+    : QObject(parent)
+    , m_processTimerId(-1)
+    , m_processInterval(750)
+    , m_enabled(true)
+{
+#ifdef WITH_SCANNER
+    m_probe = new QVideoProbe(this);
+    m_thread = new QrScanThread(this);
+    m_thread->start();
+    QObject::connect(m_thread, SIGNAL(decoded(int,QString)), this, SLOT(processCode(int,QString)));
+    QObject::connect(m_thread, SIGNAL(notifyError(const QString &, bool)), this, SIGNAL(notifyError(const QString &, bool)));
+    connect(m_probe, SIGNAL(videoFrameProbed(QVideoFrame)), this, SLOT(processFrame(QVideoFrame)));
+#endif
+}
+void QrCodeScanner::setSource(QCamera *camera)
+{
+    m_probe->setSource(camera);
+}
+void QrCodeScanner::processCode(int type, const QString &data)
+{
+    if (! m_enabled) return;
+    qDebug() << "decoded - type: " << type << " data: " << data;
+    QString address, payment_id, tx_description, recipient_name, error;
+    QVector<QString> unknown_parameters;
+    uint64_t amount(0);
+    if( ! WalletManager::instance()->parse_uri(data, address, payment_id, amount, tx_description, recipient_name, unknown_parameters, error) )
+    {
+        qDebug() << "Failed to parse_uri : " << error;
+        emit notifyError(error);
+        return;
+    }
+    if(unknown_parameters.size() > 0)
+    {
+        qDebug() << "unknown parameters " << unknown_parameters;
+        emit notifyError(error, true);
+    }
+    qDebug() << "Parsed URI : " << address << " " << payment_id << " " << amount << " " << tx_description << " " << recipient_name << " " << error;
+    QString s_amount = WalletManager::instance()->displayAmount(amount);
+    qDebug() << "Amount passed " << s_amount ;
+    emit decoded(address, payment_id, s_amount, tx_description, recipient_name);
+}
+void QrCodeScanner::processFrame(QVideoFrame frame)
+{
+    if(frame.isValid()){
+        m_curFrame = frame;
+    }
+}
+bool QrCodeScanner::enabled() const
+{
+    return m_enabled;
+}
+void QrCodeScanner::setEnabled(bool enabled)
+{
+    m_enabled = enabled;
+    if(!enabled && (m_processTimerId != -1) )
+    {
+        this->killTimer(m_processTimerId);
+        m_processTimerId = -1;
+    }
+    else if (enabled && (m_processTimerId == -1) )
+    {
+        m_processTimerId = this->startTimer(m_processInterval);
+    }
+    emit enabledChanged();
+}
+#ifdef WITH_SCANNER
+void QrCodeScanner::timerEvent(QTimerEvent *event)
+{
+    if( (event->timerId() == m_processTimerId) ){
+        m_thread->addFrame(m_curFrame);
+    }
+}
+#endif
+

src/QR-Code-scanner/QrCodeScanner.h

@@ -0,0 +1,79 @@
+// Copyright (c) 2014-2017, The Monero Project
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef QRCODESCANNER_H_
+#define QRCODESCANNER_H_
+
+#include <QImage>
+#include <QVideoFrame>
+#ifdef WITH_SCANNER
+#include "QrScanThread.h"
+#endif
+
+class QVideoProbe;
+class QCamera;
+
+class QrCodeScanner : public QObject
+{
+    Q_OBJECT
+
+    Q_PROPERTY(bool enabled READ enabled WRITE setEnabled NOTIFY enabledChanged)
+
+public:
+    QrCodeScanner(QObject *parent = Q_NULLPTR);
+
+    void setSource(QCamera*);
+
+    bool enabled() const;
+    void setEnabled(bool enabled);
+
+public Q_SLOTS:
+    void processCode(int type, const QString &data);
+    void processFrame(QVideoFrame);
+
+Q_SIGNALS:
+    void enabledChanged();
+
+    void decoded(const QString &address, const QString &payment_id, const QString &amount, const QString &tx_description, const QString &recipient_name);
+    void decode(int type, const QString &data);
+    void notifyError(const QString &error, bool warning = false);
+
+protected:
+#ifdef WITH_SCANNER
+    void timerEvent(QTimerEvent *);
+    QrScanThread *m_thread;
+#endif
+    int m_processTimerId;
+    int m_processInterval;
+    int m_enabled;
+    QVideoFrame m_curFrame;
+    QVideoProbe *m_probe;
+};
+
+#endif
+

src/QR-Code-scanner/QrScanThread.cpp

@@ -0,0 +1,132 @@
+// Copyright (c) 2014-2017, The Monero Project
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "QrScanThread.h"
+#include <QtGlobal>
+#include <QDebug>
+
+#if QT_VERSION >= QT_VERSION_CHECK(5, 6, 0)
+extern QImage qt_imageFromVideoFrame(const QVideoFrame &f);
+#else
+QImage qt_imageFromVideoFrame(const QVideoFrame &f){
+    Q_ASSERT_X(0 != 0, "qt_imageFromVideoFrame", "Should have been managed in .pro");
+    return QImage();
+}
+#endif
+
+QrScanThread::QrScanThread(QObject *parent)
+      : QThread(parent)
+       ,m_running(true)
+{
+    m_scanner.set_handler(*this);
+}
+
+void QrScanThread::image_callback(zbar::Image &image)
+{
+    qDebug() << "image_callback :  Found Code ! " ;
+    for(zbar::Image::SymbolIterator sym = image.symbol_begin();
+        sym != image.symbol_end();
+        ++sym)
+        if(!sym->get_count()) {
+            QString data = QString::fromStdString(sym->get_data());
+            emit decoded(sym->get_type(), data);
+        }
+}
+
+void QrScanThread::processZImage(zbar::Image &image)
+{
+    m_scanner.recycle_image(image);
+    zbar::Image tmp = image.convert(*(long*)"Y800");
+    m_scanner.scan(tmp);
+    image.set_symbols(tmp.get_symbols());
+}
+
+bool QrScanThread::zimageFromQImage(const QImage &qimg, zbar::Image &dst)
+{
+    switch( qimg.format() ){
+        case QImage::Format_RGB32 :
+        case QImage::Format_ARGB32 :
+        case QImage::Format_ARGB32_Premultiplied : 
+            break;
+        default :
+            emit notifyError(QString("Invalid QImage Format !"));
+            return false;
+    }
+    unsigned int bpl( qimg.bytesPerLine() ), width( bpl / 4), height( qimg.height());
+    dst.set_size(width, height);
+    dst.set_format("BGR4");
+    unsigned long datalen = qimg.byteCount();
+    dst.set_data(qimg.bits(), datalen);
+    if((width * 4 != bpl) || (width * height * 4 > datalen)){
+        emit notifyError(QString("QImage to Zbar::Image failed !"));
+        return false;
+    }
+    return true;
+}
+void QrScanThread::processQImage(const QImage &qimg)
+{
+    try {
+        m_image = QSharedPointer<zbar::Image>(new zbar::Image());
+        if( ! zimageFromQImage(qimg, *m_image) )
+            return;
+        processZImage(*m_image);
+    }
+    catch(std::exception &e) {
+        qDebug() << "ERROR: " << e.what();
+        emit notifyError(e.what());
+    }
+}
+
+void QrScanThread::processVideoFrame(const QVideoFrame &frame)
+{
+    processQImage( qt_imageFromVideoFrame(frame) );
+}
+
+void QrScanThread::stop()
+{
+    m_running = false;
+}
+
+void QrScanThread::addFrame(const QVideoFrame &frame)
+{
+    QMutexLocker locker(&m_mutex);
+    m_queue.append(frame);
+    m_waitCondition.wakeOne();
+}
+
+void QrScanThread::run()
+{
+    QVideoFrame frame;
+    while(m_running) {
+        QMutexLocker locker(&m_mutex);
+        while(m_queue.isEmpty())
+            m_waitCondition.wait(&m_mutex);
+        processVideoFrame(m_queue.takeFirst());
+    }
+}
+

src/QR-Code-scanner/QrScanThread.h

@@ -0,0 +1,69 @@
+// Copyright (c) 2014-2017, The Monero Project
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef _QRSCANTHREAD_H_
+#define _QRSCANTHREAD_H_
+
+#include <QThread>
+#include <QMutex>
+#include <QWaitCondition>
+#include <QEvent>
+#include <QVideoFrame>
+#include <QCamera>
+#include <zbar.h>
+
+class QrScanThread : public QThread, public zbar::Image::Handler
+{
+    Q_OBJECT
+
+public:
+    QrScanThread(QObject *parent = Q_NULLPTR);
+    void addFrame(const QVideoFrame &frame);
+
+Q_SIGNALS:
+    void decoded(int type, const QString &data);
+    void notifyError(const QString &error, bool warning = false);
+
+protected:
+    virtual void run();
+    virtual void stop();
+    void processVideoFrame(const QVideoFrame &);
+    void processQImage(const QImage &);
+    void processZImage(zbar::Image &image);
+    virtual void image_callback(zbar::Image &image);
+    bool zimageFromQImage(const QImage&, zbar::Image &);
+
+private:
+    zbar::ImageScanner m_scanner;
+    QSharedPointer<zbar::Image> m_image;
+    bool m_running;
+    QMutex m_mutex;
+    QWaitCondition m_waitCondition;
+    QList<QVideoFrame> m_queue;
+};
+#endif