Live mode

clahe.cpp

@@ -56,3 +56,8 @@ QPixmap CLAHE::getLumImage() const
     QImage ret(tmp.data, tmp.cols, tmp.rows, tmp.step1(), QImage::Format_Grayscale8);
     return QPixmap::fromImage(ret);
 }
+
+bool CLAHE::imageLoaded() const
+{
+    return _lumImage.ptr();
+}

clahe.h

@@ -19,6 +19,7 @@ public:
     void apply(float clipLimit, int kernelSize);
     QPixmap getImage() const;
     QPixmap getLumImage() const;
+    bool imageLoaded() const;
 };
 
 #endif // CLAHE_H

mainwindow.cpp

@@ -45,10 +45,19 @@ void MainWindow::saveFile()
 
 void MainWindow::applyClahe()
 {
-    QPixmap pixmap;
-    _clahe->apply(_clipLimitSlider->value()/100.0f, _kernelSizeSelect->currentText().toInt());
-    pixmap = _clahe->getImage();
-    _imageScrollArea->setImage(pixmap);
+    if(_clahe->imageLoaded())
+    {
+        QPixmap pixmap;
+        _clahe->apply(_clipLimitSlider->value()/100.0f, _kernelSizeSelect->currentText().toInt());
+        pixmap = _clahe->getImage();
+        _imageScrollArea->setImage(pixmap);
+    }
+}
+
+void MainWindow::applyLive()
+{
+    if(_liveApply->isChecked())
+        applyClahe();
 }
 
 void MainWindow::setupUI()
@@ -58,6 +67,9 @@ void MainWindow::setupUI()
     QMenu *fileMenu = menuBar()->addMenu(tr("File"));
     fileMenu->addAction(tr("Open file"), this, SLOT(openFile()), QKeySequence("Ctrl+O"));
     fileMenu->addAction(tr("Save file"), this, SLOT(saveFile()), QKeySequence("Ctrl+S"));
+    _liveApply = fileMenu->addAction(tr("Live mode"));
+    _liveApply->setCheckable(true);
+    _liveApply->setChecked(true);
     fileMenu->addAction(tr("Quit"), this, SLOT(close()), QKeySequence("Ctrl+Q"));
 
     _clipLimitEdit  = new QLineEdit;
@@ -75,6 +87,7 @@ void MainWindow::setupUI()
 
     _kernelSizeSelect = new QComboBox;
     _kernelSizeSelect->addItems({"8", "16", "32", "64", "128", "256"});
+    connect(_kernelSizeSelect, SIGNAL(currentIndexChanged(int)), this, SLOT(applyLive()));
 
     QHBoxLayout *claheLayout = new QHBoxLayout;
     claheLayout->addWidget(_clipLimitEdit);
@@ -95,4 +108,5 @@ void MainWindow::setupUI()
 void MainWindow::clipSliderValueChanged(int value)
 {
     _clipLimitEdit->setText(QString::number(value/100.0));
+    applyLive();
 }

mainwindow.h

@@ -15,6 +15,7 @@ class MainWindow : public QMainWindow
     QLineEdit *_clipLimitEdit;
     CLAHE *_clahe;
     ImageScrollArea *_imageScrollArea;
+    QAction *_liveApply;
 public:
     explicit MainWindow(QWidget *parent = nullptr);
     ~MainWindow();
@@ -22,6 +23,7 @@ public slots:
     void openFile();
     void saveFile();
     void applyClahe();
+    void applyLive();
 private:
     void setupUI();
 private slots: