Refactor V4L2 and X11 grabbers to share more code

Former-commit-id: 46176e53d1acf39f9bd0c0ecbb8e5fb5ab4d45be

include/grabber/X11Grabber.h

@@ -0,0 +1,37 @@
+
+// Hyperion-utils includes
+#include <utils/Image.h>
+#include <utils/ColorRgb.h>
+
+// X11 includes
+#include <X11/Xlib.h>
+
+class X11Grabber
+{
+public:
+
+	X11Grabber(const unsigned cropHorizontal, const unsigned cropVertical, const unsigned pixelDecimation);
+
+	virtual ~X11Grabber();
+
+	int open();
+
+	Image<ColorRgb> & grab();
+
+private:
+
+	const unsigned _pixelDecimation;
+
+	const unsigned _cropWidth;
+	const unsigned _cropHeight;
+
+	/// Reference to the X11 display (nullptr if not opened)
+	Display * _x11Display;
+
+	unsigned _screenWidth;
+	unsigned _screenHeight;
+
+	Image<ColorRgb> _image;
+
+	int updateScreenDimensions();
+};

include/protoserver/ProtoConnection.h

@@ -0,0 +1,102 @@
+#pragma once
+
+// stl includes
+#include <string>
+
+// Qt includes
+#include <QColor>
+#include <QImage>
+#include <QTcpSocket>
+#include <QMap>
+
+// hyperion util
+#include <utils/Image.h>
+#include <utils/ColorRgb.h>
+
+// jsoncpp includes
+#include <message.pb.h>
+
+///
+/// Connection class to setup an connection to the hyperion server and execute commands
+///
+class ProtoConnection
+{
+public:
+    ///
+    /// Constructor
+    ///
+    /// @param address The address of the Hyperion server (for example "192.168.0.32:19444)
+    ///
+    ProtoConnection(const std::string & address);
+
+    ///
+    /// Destructor
+    ///
+    ~ProtoConnection();
+
+    /// Do not read reply messages from Hyperion if set to true
+    void setSkipReply(bool skip);
+
+    ///
+    /// Set all leds to the specified color
+    ///
+    /// @param color The color
+    /// @param priority The priority
+    /// @param duration The duration in milliseconds
+    ///
+    void setColor(const ColorRgb & color, int priority, int duration = 1);
+
+    ///
+    /// Set the leds according to the given image (assume the image is stretched to the display size)
+    ///
+    /// @param image The image
+    /// @param priority The priority
+    /// @param duration The duration in milliseconds
+    ///
+    void setImage(const Image<ColorRgb> & image, int priority, int duration = -1);
+
+    ///
+    /// Clear the given priority channel
+    ///
+    /// @param priority The priority
+    ///
+    void clear(int priority);
+
+    ///
+    /// Clear all priority channels
+    ///
+    void clearAll();
+
+private:
+    /// Try to connect to the Hyperion host
+    void connectToHost();
+
+    ///
+    /// Send a command message and receive its reply
+    ///
+    /// @param message The message to send
+    ///
+    void sendMessage(const proto::HyperionRequest & message);
+
+    ///
+    /// Parse a reply message
+    ///
+    /// @param reply The received reply
+    ///
+    /// @return true if the reply indicates success
+    ///
+    bool parseReply(const proto::HyperionReply & reply);
+
+private:
+    /// The TCP-Socket with the connection to the server
+    QTcpSocket _socket;
+
+    /// Host address
+    QString _host;
+
+    /// Host port
+    uint16_t _port;
+
+    /// Skip receiving reply messages from Hyperion if set
+    bool _skipReply;
+};

include/protoserver/ProtoConnectionWrapper.h

@@ -0,0 +1,34 @@
+// Qt includes
+#include <QObject>
+
+// hyperion includes
+#include <utils/Image.h>
+#include <utils/ColorRgb.h>
+
+// hyperion proto includes
+#include "protoserver/ProtoConnection.h"
+
+/// This class handles callbacks from the V4L2 grabber
+class ProtoConnectionWrapper : public QObject
+{
+    Q_OBJECT
+
+public:
+    ProtoConnectionWrapper(const std::string & address, int priority, int duration_ms, bool skipProtoReply);
+    virtual ~ProtoConnectionWrapper();
+
+public slots:
+    /// Handle a single image
+    /// @param image The image to process
+    void receiveImage(const Image<ColorRgb> & image);
+
+private:
+    /// Priority for calls to Hyperion
+    const int _priority;
+
+    /// Duration for color calls to Hyperion
+    const int _duration_ms;
+
+    /// Hyperion proto connection object
+    ProtoConnection _connection;
+};