Windows: Add a DDA grabber for much better performance (#1745)

* Add a DXDI DDA grabber

* Change all names to camel case

* Handle cropping and pixel decimation

* Try more persistently to restart capture after an error occurred.

These can happen when changing resolution, or resuming from sleep.

include/grabber/dda/DDAGrabber.h

@@ -0,0 +1,75 @@
+#pragma once
+
+#include <QObject>
+#include <QJsonObject>
+
+#include <hyperion/Grabber.h>
+#include <utils/ColorRgb.h>
+
+class DDAGrabberImpl;
+
+class DDAGrabber : public Grabber
+{
+public:
+	DDAGrabber(int display = 0, int cropLeft = 0, int cropRight = 0, int cropTop = 0, int cropBottom = 0);
+
+	virtual ~DDAGrabber();
+
+	///
+	/// Captures a single snapshot of the display and writes the data to the given image. The
+	/// provided image should have the same dimensions as the configured values (_width and _height)
+	///
+	/// @param[out] image  The snapped screenshot
+	///
+	int grabFrame(Image<ColorRgb> &image);
+
+	///
+	/// @brief Set a new video mode
+	///
+	void setVideoMode(VideoMode mode) override;
+
+	///
+	/// @brief Apply new width/height values, overwrite Grabber.h implementation
+	///
+	bool setWidthHeight(int /* width */, int /*height*/) override
+	{
+		return true;
+	}
+
+	///
+	/// @brief Apply new pixelDecimation
+	///
+	bool setPixelDecimation(int pixelDecimation) override;
+
+	///
+	/// Set the crop values
+	/// @param  cropLeft    Left pixel crop
+	/// @param  cropRight   Right pixel crop
+	/// @param  cropTop     Top pixel crop
+	/// @param  cropBottom  Bottom pixel crop
+	///
+	void setCropping(int cropLeft, int cropRight, int cropTop, int cropBottom);
+
+	///
+	/// @brief Apply display index
+	///
+	bool setDisplayIndex(int index) override;
+
+	/// @brief Discover QT screens available (for configuration).
+	///
+	/// @param[in] params Parameters used to overwrite discovery default behaviour
+	///
+	/// @return A JSON structure holding a list of devices found
+	///
+	QJsonObject discover(const QJsonObject &params);
+
+private:
+	///
+	/// @brief Setup a new capture display, will free the previous one
+	/// @return True on success, false if no display is found
+	///
+	bool restartCapture();
+
+private:
+	std::unique_ptr<DDAGrabberImpl> d;
+};

include/grabber/dda/DDAWrapper.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include <grabber/dda/DDAGrabber.h>
+#include <hyperion/GrabberWrapper.h>
+
+class DDAWrapper : public GrabberWrapper
+{
+public:
+	static constexpr const char *GRABBERTYPE = "DDA";
+
+	DDAWrapper(int updateRate_Hz = GrabberWrapper::DEFAULT_RATE_HZ, int display = 0,
+	           int pixelDecimation = GrabberWrapper::DEFAULT_PIXELDECIMATION, int cropLeft = 0, int cropRight = 0,
+	           int cropTop = 0, int cropBottom = 0);
+
+	DDAWrapper(const QJsonDocument &grabberConfig = QJsonDocument());
+
+	virtual ~DDAWrapper(){};
+
+public slots:
+	virtual void action();
+
+private:
+	DDAGrabber _grabber;
+};