Fix embedded V4L2 grabber

Former-commit-id: f9dc759a8fcac8ac95288b12a007e9c78aed82c3

include/utils/Image.h

@@ -13,6 +13,14 @@ public:
 
 	typedef Pixel_T pixel_type;
 
+	///
+	/// Default constructor for an image
+	///
+	Image() :
+		Image(1, 1)
+	{
+	}
+
 	///
 	/// Constructor for an image with specified width and height
 	///
@@ -22,8 +30,8 @@ public:
 	Image(const unsigned width, const unsigned height) :
 		_width(width),
 		_height(height),
-		_pixels(new Pixel_T[width*height + 1]),
-		_endOfPixels(_pixels + width*height)
+		_pixels(new Pixel_T[width * height + 1]),
+		_endOfPixels(_pixels + width * height)
 	{
 		memset(_pixels, 0, (_width*_height+1)*sizeof(Pixel_T));
 	}
@@ -38,12 +46,24 @@ public:
 	Image(const unsigned width, const unsigned height, const Pixel_T background) :
 		_width(width),
 		_height(height),
-		_pixels(new Pixel_T[width*height + 1]),
-		_endOfPixels(_pixels + width*height)
+		_pixels(new Pixel_T[width * height + 1]),
+		_endOfPixels(_pixels + width * height)
 	{
 		std::fill(_pixels, _endOfPixels, background);
 	}
 
+	///
+	/// Copy constructor for an image
+	///
+	Image(const Image & other) :
+		_width(other._width),
+		_height(other._height),
+		_pixels(new Pixel_T[other._width * other._height + 1]),
+		_endOfPixels(_pixels + other._width * other._height)
+	{
+		memcpy(_pixels, other._pixels, other._width * other._height * sizeof(Pixel_T));
+	}
+
 	///
 	/// Destructor
 	///

libsrc/grabber/v4l2/V4L2Wrapper.cpp

@@ -1,3 +1,5 @@
+#include <QMetaType>
+
 #include <grabber/V4L2Wrapper.h>
 
 #include <hyperion/ImageProcessorFactory.h>
@@ -25,6 +27,9 @@ V4L2Wrapper::V4L2Wrapper(const std::string &device,
 	_hyperion(hyperion),
 	_ledColors(hyperion->getLedCount(), ColorRgb{0,0,0})
 {
+	// register the image type
+	qRegisterMetaType<Image<ColorRgb>>("Image<ColorRgb>");
+
 	// connect the new frame signal using a queued connection, because it will be called from a different thread
 	QObject::connect(&_grabber, SIGNAL(newFrame(Image<ColorRgb>)), this, SLOT(newFrame(Image<ColorRgb>)), Qt::QueuedConnection);
 }

src/hyperion-v4l2/hyperion-v4l2.cpp

@@ -39,6 +39,9 @@ int main(int argc, char** argv)
 	setlocale(LC_ALL, "C");
 	QLocale::setDefault(QLocale::c());
 
+	// register the image type to use in signals
+	qRegisterMetaType<Image<ColorRgb>>("Image<ColorRgb>");
+
 	try
 	{
 		// create the option parser and initialize all parameters