wayland/screencopy: add screencopy

src/wayland/buffer/qsg.hpp

@@ -0,0 +1,45 @@
+#pragma once
+
+#include <memory>
+
+#include <qcontainerfwd.h>
+#include <qquickwindow.h>
+#include <qsgimagenode.h>
+#include <qsgnode.h>
+#include <qsgtexture.h>
+#include <qvectornd.h>
+
+#include "manager.hpp"
+
+namespace qs::wayland::buffer {
+
+// Interact only from QSG thread.
+class WlBufferQSGTexture {
+public:
+	virtual ~WlBufferQSGTexture() = default;
+	Q_DISABLE_COPY_MOVE(WlBufferQSGTexture);
+
+	[[nodiscard]] virtual QSGTexture* texture() const = 0;
+	virtual void sync(const WlBuffer* /*buffer*/, QQuickWindow* /*window*/) {}
+
+protected:
+	WlBufferQSGTexture() = default;
+};
+
+// Interact only from QSG thread.
+class WlBufferQSGDisplayNode: public QSGTransformNode {
+public:
+	explicit WlBufferQSGDisplayNode(QQuickWindow* window);
+
+	void syncSwapchain(const WlBufferSwapchain& swapchain);
+	void setRect(const QRectF& rect);
+
+private:
+	QQuickWindow* window;
+	QSGImageNode* imageNode;
+	QPair<WlBuffer*, std::unique_ptr<WlBufferQSGTexture>> buffer1;
+	QPair<WlBuffer*, std::unique_ptr<WlBufferQSGTexture>> buffer2;
+	bool presentSecondBuffer = false;
+};
+
+} // namespace qs::wayland::buffer