[platforms/x11/windowed] Create output devices

Summary: Create output devices in X11 nested Wayland session.

Test Plan: Started nested session in X11. KScreen showed output.

Reviewers: #kwin

Subscribers: kwin

Tags: #kwin

Maniphest Tasks: T11459

Differential Revision: https://phabricator.kde.org/D23479

plugins/platforms/x11/windowed/x11windowed_backend.cpp

@@ -54,6 +54,7 @@ X11WindowedBackend::X11WindowedBackend(QObject *parent)
 {
     setSupportsPointerWarping(true);
     connect(this, &X11WindowedBackend::sizeChanged, this, &X11WindowedBackend::screenSizeChanged);
+    handleOutputs();
 }
 
 X11WindowedBackend::~X11WindowedBackend()
@@ -153,9 +154,7 @@ void X11WindowedBackend::createOutputs()
     int logicalWidthSum = 0;
     for (int i = 0; i < initialOutputCount(); ++i) {
         auto *output = new X11WindowedOutput(this);
-        output->setScale(initialOutputScale());
-        output->setGeometry(QPoint(logicalWidthSum, 0), QSize(pixelWidth, pixelHeight));
-        output->init();
+        output->init(QPoint(logicalWidthSum, 0), QSize(pixelWidth, pixelHeight));
 
         m_protocols = protocolsAtom;
         m_deleteWindowProtocol = deleteWindowAtom;

plugins/platforms/x11/windowed/x11windowed_output.cpp

@@ -47,8 +47,20 @@ X11WindowedOutput::~X11WindowedOutput()
     xcb_flush(m_backend->connection());
 }
 
-void X11WindowedOutput::init()
+void X11WindowedOutput::init(const QPoint &logicalPosition, const QSize &pixelSize)
 {
+    KWayland::Server::OutputDeviceInterface::Mode mode;
+    mode.id = 0;
+    mode.size = pixelSize;
+    mode.flags = KWayland::Server::OutputDeviceInterface::ModeFlag::Current;
+    mode.refreshRate = 60000;  // TODO: get refresh rate via randr
+    AbstractWaylandOutput::initWaylandOutputDevice("model_TODO", "manufacturer_TODO",
+                                                   "UUID_TODO", { mode });
+
+    setEnabled(true);
+    setGeometry(logicalPosition, pixelSize);
+    setScale(m_backend->initialOutputScale());
+
     uint32_t mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK;
     const uint32_t values[] = {
         m_backend->screen()->black_pixel,
@@ -67,7 +79,7 @@ void X11WindowedOutput::init()
                       m_window,
                       m_backend->screen()->root,
                       0, 0,
-                      pixelSize().width(), pixelSize().height(),
+                      pixelSize.width(), pixelSize.height(),
                       0, XCB_WINDOW_CLASS_INPUT_OUTPUT, XCB_COPY_FROM_PARENT,
                       mask, values);
 

plugins/platforms/x11/windowed/x11windowed_output.h

@@ -45,7 +45,7 @@ public:
     explicit X11WindowedOutput(X11WindowedBackend *backend);
     ~X11WindowedOutput() override;
 
-    void init();
+    void init(const QPoint &logicalPosition, const QSize &pixelSize);
 
     xcb_window_t window() const {
         return m_window;