27 Implementation of center image on QR code

.gitignore

@@ -40,6 +40,7 @@ Thumbs.db
 *.pro.user*
 *.txt.user*
 build-*
+build
 
 # xemacs temporary files
 *.flc

examples/QmlBarcodeGenerator/qml/GeneratorPage.qml

@@ -58,15 +58,6 @@ ApplicationWindow {
         right: parent.right
       }
 
-      //      TextField {
-      //        id: textField
-
-      //        anchors.fill: parent
-
-      //        selectByMouse: true
-
-      //        placeholderText: qsTr("Input")
-      //      }
       CTextField {
         id: textField
 
@@ -226,7 +217,7 @@ ApplicationWindow {
           id: widthField
 
           implicitWidth: parent.width
-          implicitHeight: parent.height / 8
+          implicitHeight: parent.height / 10
 
           placeholderText: "Current width: " + barcodeGenerator.width
 
@@ -244,7 +235,7 @@ ApplicationWindow {
           id: heightField
 
           implicitWidth: parent.width
-          implicitHeight: parent.height / 8
+          implicitHeight: parent.height / 10
 
           placeholderText: "Current height: " + barcodeGenerator.height
 
@@ -262,7 +253,7 @@ ApplicationWindow {
           id: marginField
 
           implicitWidth: parent.width
-          implicitHeight: parent.height / 8
+          implicitHeight: parent.height / 10
 
           placeholderText: "Current margin: " + barcodeGenerator.margin
 
@@ -280,7 +271,7 @@ ApplicationWindow {
           id: eccLevelField
 
           implicitWidth: parent.width
-          implicitHeight: parent.height / 8
+          implicitHeight: parent.height / 10
 
           placeholderText: "Current ECC Level: " + barcodeGenerator.eccLevel
 
@@ -293,7 +284,7 @@ ApplicationWindow {
           id: formatDropDown
 
           implicitWidth: parent.width
-          implicitHeight: parent.height / 8
+          implicitHeight: parent.height / 10
 
           model: ListModel {
             id: formats
@@ -350,7 +341,7 @@ ApplicationWindow {
           id: imageFormat
 
           implicitWidth: parent.width
-          implicitHeight: parent.height / 8
+          implicitHeight: parent.height / 10
 
           model: ListModel {
             id: extensions
@@ -374,12 +365,42 @@ ApplicationWindow {
           text: qsTr(barcodeGenerator.fileName)
 
           implicitWidth: parent.width
-          implicitHeight: parent.height / 8
+          implicitHeight: parent.height / 10
 
           onEditingFinished: {
             barcodeGenerator.fileName = text
           }
         }
+
+        CTextField {
+          id: imagePathField
+
+          text: qsTr(barcodeGenerator.imagePath)
+
+          implicitWidth: parent.width
+          implicitHeight: parent.height / 10
+
+          placeholderText: "Current image path: " + barcodeGenerator.imagePath
+
+          onEditingFinished: {
+            barcodeGenerator.imagePath = text
+          }
+        }
+
+        CTextField {
+          id: centerImageRatioField
+
+          text: qsTr(barcodeGenerator.centerImageRatio.toString())
+
+          implicitWidth: parent.width
+          implicitHeight: parent.height / 10
+
+          placeholderText: "Current center image ratio: " + barcodeGenerator.centerImageRatio
+
+          onEditingFinished: {
+            barcodeGenerator.centerImageRatio = parseInt(text)
+          }
+        }
       }
 
       onClosed: {

src/SBarcodeGenerator.cpp

@@ -1,5 +1,6 @@
 #include "SBarcodeGenerator.h"
 #include <QStandardPaths>
+#include <QPainter>
 
 #ifdef Q_OS_ANDROID
 #if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
@@ -21,19 +22,47 @@ bool SBarcodeGenerator::generate(const QString &inputString)
         if (inputString.isEmpty()) {
             return false;
         } else {
+            // Change ecc level to max to generate image on QR code.
+            if (m_format == SCodes::SBarcodeFormat::QRCode && !m_imagePath.isEmpty()) {
+                if (m_eccLevel < 8) {
+                    qDebug() << "To draw image on QR Code use maximum level of ecc. Setting it to 8.";
+
+                    m_eccLevel = 8;
+                    emit eccLevelChanged(m_eccLevel);
+                }
+            }
+
             ZXing::MultiFormatWriter writer = ZXing::MultiFormatWriter(SCodes::toZXingFormat(m_format)).setMargin(
                 m_margin).setEccLevel(m_eccLevel);
 
-            _bitmap = ZXing::ToMatrix<uint8_t>(writer.encode(inputString.toStdString(), m_width, m_height));
+            auto qrCodeMatrix = writer.encode(inputString.toStdString(), m_width, m_height);
+            auto _bitmap = ZXing::ToMatrix<uint8_t>(qrCodeMatrix);
+
+            QImage image(_bitmap.data(), m_width, m_height, QImage::Format_Grayscale8);
+
+            // Center images works only on QR codes.
+            if (m_format == SCodes::SBarcodeFormat::QRCode) {
+                if (!m_imagePath.isEmpty()) {
+                    QSize centerImageSize(m_width / m_centerImageRatio, m_height / m_centerImageRatio);
+                    drawCenterImage(&image, m_imagePath, centerImageSize,
+                                    (image.width() - centerImageSize.width()) / 2,
+                                    (image.height() - centerImageSize.height()) / 2);
+                } else {
+                    qDebug() << "Center Image path is empty. Skip drawing center image.";
+                }
+            } else {
+                qDebug() << "Center images works only on QR codes.";
+            }
 
             m_filePath = QDir::tempPath() + "/" + m_fileName + "." + m_extension;
 
-            auto image = QImage(_bitmap.data(), m_width, m_height, QImage::Format::Format_Grayscale8);
-
-            QFile file{m_filePath};
-
-            if(file.open(QIODevice::WriteOnly | QIODevice::Truncate)) {
+            // Save the final image with the QR code and center image
+            QFile file(m_filePath);
+            if (file.open(QIODevice::WriteOnly | QIODevice::Truncate)) {
                 image.save(&file);
+            } else {
+                qWarning() << "Could not open file for writing!";
+                return false;
             }
 
             emit generationFinished();
@@ -82,6 +111,37 @@ bool SBarcodeGenerator::saveImage()
     return true;
 }
 
+void SBarcodeGenerator::drawCenterImage(QImage *parentImage, QString imagePath, QSize imageSize, int x, int y)
+{
+    QImage centerImage(imageSize, QImage::Format_RGB32);
+    centerImage.load(imagePath);
+
+    if (centerImage.isNull()) {
+        qWarning() << "Center image could not be loaded!";
+        return;
+    }
+
+    // Create a painter to overlay the center image on the parentImage.
+    QPainter painter(parentImage);
+
+    // Draw background rectangle.
+    painter.setBrush(Qt::white);
+    painter.setPen(Qt::NoPen);
+    painter.drawRect(x, y, imageSize.width(), imageSize.height());
+
+    // Scale the center image to be smaller than background rectangle.
+    float imageRatio = 0.8;
+    centerImage = centerImage.scaled(imageSize.width() * imageRatio,
+                                     imageSize.height() * imageRatio,
+                                     Qt::KeepAspectRatio, Qt::SmoothTransformation);
+
+    // Draw image.
+    painter.drawImage(x + (imageSize.width() - centerImage.width()) / 2,
+                      y + (imageSize.height() - centerImage.height()) / 2,
+                      centerImage);
+    painter.end();
+}
+
 SCodes::SBarcodeFormat SBarcodeGenerator::format() const
 {
     return m_format;
@@ -112,3 +172,33 @@ void SBarcodeGenerator::setFormat(const QString &formatName)
 {
     setFormat(SCodes::fromString(formatName));
 }
+
+QString SBarcodeGenerator::imagePath() const
+{
+    return m_imagePath;
+}
+
+void SBarcodeGenerator::setImagePath(const QString &imagePath)
+{
+    if (m_imagePath == imagePath) {
+        return;
+    }
+
+    m_imagePath = imagePath;
+    emit imagePathChanged();
+}
+
+int SBarcodeGenerator::centerImageRatio() const
+{
+    return m_centerImageRatio;
+}
+
+void SBarcodeGenerator::setCenterImageRatio(const int &centerImageRatio)
+{
+    if (m_centerImageRatio == centerImageRatio) {
+        return;
+    }
+
+    m_centerImageRatio = centerImageRatio;
+    emit centerImageRatioChanged();
+}

src/SBarcodeGenerator.h

@@ -27,6 +27,8 @@ class SBarcodeGenerator : public QQuickItem
     Q_PROPERTY(QString filePath MEMBER m_filePath)
     Q_PROPERTY(QString inputText MEMBER m_inputText)
     Q_PROPERTY(SCodes::SBarcodeFormat format READ format WRITE setFormat NOTIFY formatChanged)
+    Q_PROPERTY(QString imagePath READ imagePath WRITE setImagePath NOTIFY imagePathChanged)
+    Q_PROPERTY(int centerImageRatio READ centerImageRatio WRITE setCenterImageRatio NOTIFY centerImageRatioChanged)
 
 public:
 
@@ -56,6 +58,32 @@ class SBarcodeGenerator : public QQuickItem
      */
     void setFormat(SCodes::SBarcodeFormat format);
 
+    /*!
+     * \fn QString imagePath() const
+     * \brief Returns the center image path.
+     */
+    QString imagePath() const;
+
+    /*!
+     * \fn void setImagePath(const QString &imagePath)
+     * \brief Sets the center image path.
+     * \param const QString &imagePath - new image path.
+     */
+    void setImagePath(const QString &imagePath);
+
+    /*!
+     * \fn int centerImageRatio() const
+     * \brief Returns the center image ratio.
+     */
+    int centerImageRatio() const;
+
+    /*!
+     * \fn void setCenterImageRatio(const int &centerImageRatio)
+     * \brief Sets the center image ratio.
+     * \param const int &centerImageRatio - new image ratio.
+     */
+    void setCenterImageRatio(const int &centerImageRatio);
+
 public slots:
 
     /*!
@@ -122,20 +150,44 @@ public slots:
      */
     void formatChanged(SCodes::SBarcodeFormat format);
 
+    /*!
+     * \brief This signal is emitted to send image path to QML.
+     */
+    void imagePathChanged();
+
+    /*!
+     * \brief This signal is emitted to send center image ratio to QML.
+     */
+    void centerImageRatioChanged();
+
 private:
     int m_width    = 500;
     int m_height   = 500;
     int m_margin   = 10;
     int m_eccLevel = -1;
 
+    // centerImageRatio defines the ratio by which the center image is smaller than the QR code.
+    int m_centerImageRatio = 5;
+
     QString m_extension = "png";
     QString m_fileName  = "code";
     QString m_filePath  = "";
     QString m_inputText = "";
+    QString m_imagePath = "";
 
     SCodes::SBarcodeFormat m_format = SCodes::SBarcodeFormat::Code128;
 
     ZXing::Matrix<uint8_t> _bitmap = ZXing::Matrix<uint8_t>();
+
+    /*!
+     * \brief This method draws Rectangle and `imageRatio` smaller Image in the center of that Rectangle.
+     * \param QImage *parentImage - Image parent. It is used for Painter constructor.
+     * \param QString imagePath - Image path.
+     * \param QSize imageSize - Image size.
+     * \param int x - X coordinate where Image should be painted.
+     * \param Qint y - Y coordinate where Image should be painted.
+     */
+    void drawCenterImage(QImage *parentImage, QString imagePath, QSize imageSize, int x, int y);
 };
 
 #endif // SBARCODEGENERATOR_H