hyperion.ng/include/grabber/DispmanxWrapper.h

#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 DispmanxFrameGrabber;
class Hyperion;
class ImageProcessor;

///
/// The DispmanxWrapper uses an instance of the DispmanxFrameGrabber 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 DispmanxWrapper: public QObject
{
	Q_OBJECT
public:
	///
	/// Constructs the dispmanx frame grabber with a specified grab size and update rate.
	///
	/// @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
	///
	DispmanxWrapper(const unsigned grabWidth, const unsigned grabHeight, const unsigned updateRate_Hz, const int priority, Hyperion * hyperion);

	///
	/// Destructor of this dispmanx frame grabber. Releases any claimed resources.
	///
	virtual ~DispmanxWrapper();

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);

signals:
	void emitImage(int priority, const Image<ColorRgb> & image, const int timeout_ms);

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
	DispmanxFrameGrabber * _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;

	// forwarding enabled
	bool _forward;
};