Create image callback using Qt signal

Former-commit-id: cf469ba01ffd26d286e6fb8d9f081cf126042e50

src/hyperion-v4l2/ScreenshotHandler.h

@@ -0,0 +1,24 @@
+// Qt includes
+#include <QObject>
+
+// hyperionincludes
+#include <utils/Image.h>
+#include <utils/ColorRgb.h>
+
+/// This class handles callbacks from the V4L2 grabber
+class ScreenshotHandler : public QObject
+{
+	Q_OBJECT
+
+public:
+	ScreenshotHandler(const std::string & filename);
+	virtual ~ScreenshotHandler();
+
+public slots:
+	/// Handle a single image
+	/// @param image The image to process
+	void receiveImage(const Image<ColorRgb> & image);
+
+private:
+	const std::string _filename;
+};