add image rotation and flipping

videoviewerwidget.h

@@ -9,6 +9,7 @@
 #include <QImage>
 #include <QSlider>
 #include <QScrollArea>
+#include <QCheckBox>
 #include <gst/gst.h>
 #include <gst/app/gstappsink.h>
 
@@ -28,6 +29,9 @@ private slots:
     void onStopViewer();
     void onSourceTypeChanged(int index);
     void onZoomChanged(int value);
+    void onRotationChanged(int index);
+    void onFlipHorizontalChanged(Qt::CheckState state);
+    void onFlipVerticalChanged(Qt::CheckState state);
     void displayFrame(const QImage& frame);
 
 private:
@@ -52,6 +56,9 @@ private:
     QLabel* m_statusLabel;
     QSlider* m_zoomSlider;
     QLabel* m_zoomLabel;
+    QComboBox* m_rotationCombo;
+    QCheckBox* m_flipHorizontal;
+    QCheckBox* m_flipVertical;
 
     // GStreamer elements (8-byte pointers)
     GstElement* m_pipeline;
@@ -63,6 +70,11 @@ private:
     // Bus watch ID (4-byte unsigned int)
     guint m_busWatchId;
 
+    // Transformation settings (4 bytes + 2 bytes)
+    int m_rotationAngle;
+    bool m_flipHorizontalEnabled;
+    bool m_flipVerticalEnabled;
+
     // Video state (large object at end)
     QImage m_currentFrame;
 };