Added frame buffer grabber support

Former-commit-id: a73767a1abb2cac977492bd8c6cc593fb21840e1

include/grabber/FramebufferWrapper.h

@@ -0,0 +1,95 @@
+#pragma once
+
+// QT includes
+#include <QObject>
+#include <QTimer>
+
+// Utils includes
+#include <utils/Image.h>
+#include <utils/ColorRgb.h>
+#include <utils/ColorRgba.h>
+#include <utils/GrabbingMode.h>
+#include <utils/VideoMode.h>
+
+// Forward class declaration
+class FramebufferFrameGrabber;
+class Hyperion;
+class ImageProcessor;
+
+///
+/// The FramebufferWrapper uses an instance of the FramebufferFrameGrabber to obtain ImageRgb's from the
+/// displayed content. This ImageRgb is processed to a ColorRgb for each led and commmited to the
+/// attached Hyperion.
+///
+class FramebufferWrapper: public QObject
+{
+	Q_OBJECT
+public:
+	///
+	/// Constructs the framebuffer frame grabber with a specified grab size and update rate.
+	///
+	/// @param[in] device Framebuffer device name/path
+	/// @param[in] grabWidth  The width of the grabbed image [pixels]
+	/// @param[in] grabHeight  The height of the grabbed images [pixels]
+	/// @param[in] updateRate_Hz  The image grab rate [Hz]
+	/// @param[in] hyperion  The instance of Hyperion used to write the led values
+	///
+	FramebufferWrapper(const std::string & device, const unsigned grabWidth, const unsigned grabHeight, const unsigned updateRate_Hz, Hyperion * hyperion);
+
+	///
+	/// Destructor of this framebuffer frame grabber. Releases any claimed resources.
+	///
+	virtual ~FramebufferWrapper();
+
+public slots:
+	///
+	/// Starts the grabber wich produces led values with the specified update rate
+	///
+	void start();
+
+	///
+	/// Performs a single frame grab and computes the led-colors
+	///
+	void action();
+
+	///
+	/// Stops the grabber
+	///
+	void stop();
+
+	///
+	/// Set the grabbing mode
+	/// @param[in] mode The new grabbing mode
+	///
+	void setGrabbingMode(const GrabbingMode mode);
+
+	///
+	/// Set the video mode (2D/3D)
+	/// @param[in] mode The new video mode
+	///
+	void setVideoMode(const VideoMode videoMode);
+
+private:
+	/// The update rate [Hz]
+	const int _updateInterval_ms;
+	/// The timeout of the led colors [ms]
+	const int _timeout_ms;
+	/// The priority of the led colors
+	const int _priority;
+
+	/// The timer for generating events with the specified update rate
+	QTimer _timer;
+
+	/// The image used for grabbing frames
+	Image<ColorRgba> _image;
+	/// The actual grabber
+	FramebufferFrameGrabber * _frameGrabber;
+	/// The processor for transforming images to led colors
+	ImageProcessor * _processor;
+
+	/// The list with computed led colors
+	std::vector<ColorRgb> _ledColors;
+
+	/// Pointer to Hyperion for writing led values
+	Hyperion * _hyperion;
+};

include/utils/Image.h

@@ -142,7 +142,7 @@ public:
     /// @param height The height of the image
     void resize(const unsigned width, const unsigned height)
     {
-        if ((width*height) > (_endOfPixels-_pixels))
+        if ((width*height) > unsigned((_endOfPixels-_pixels)))
         {
             delete[] _pixels;
             _pixels = new Pixel_T[width*height + 1];