[platforms/fbdev] Create output device

Summary: Create output device in framebuffer backend.

Test Plan: On VT started `dbus-run-session kwin_wayland --framebuffer --xwayland`.

Reviewers: #kwin

Subscribers: kwin

Tags: #kwin

Maniphest Tasks: T11459

Differential Revision: https://phabricator.kde.org/D23478

plugins/platforms/fbdev/fb_backend.cpp

@@ -37,9 +37,22 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 namespace KWin
 {
 
+void FramebufferOutput::init(const QSize &size)
+{
+    m_pixelSize = size;
+    KWayland::Server::OutputDeviceInterface::Mode mode;
+    mode.id = 0;
+    mode.size = size;
+    mode.flags = KWayland::Server::OutputDeviceInterface::ModeFlag::Current;
+    mode.refreshRate = 60000;  // TODO: get actual refresh rate of fb device?
+    AbstractWaylandOutput::initWaylandOutputDevice("model_TODO", "manufacturer_TODO",
+                                                   "UUID_TODO", { mode });
+}
+
 FramebufferBackend::FramebufferBackend(QObject *parent)
     : Platform(parent)
 {
+    handleOutputs();
 }
 
 FramebufferBackend::~FramebufferBackend()
@@ -137,8 +150,9 @@ bool FramebufferBackend::handleScreenInfo()
     }
 
     auto *output = new FramebufferOutput(this);
-    output->setPixelSize(QSize(varinfo.xres, varinfo.yres));
+    output->init(QSize(varinfo.xres, varinfo.yres));
     output->setRawPhysicalSize(QSize(varinfo.width, varinfo.height));
+    output->setEnabled(true);
     m_outputs << output;
 
     m_id = QByteArray(fixinfo.id);

plugins/platforms/fbdev/fb_backend.h

@@ -37,12 +37,10 @@ public:
     FramebufferOutput(QObject *parent = nullptr) : AbstractWaylandOutput(parent) {}
     ~FramebufferOutput() override = default;
 
+    void init(const QSize &size);
     QSize pixelSize() const override {
         return m_pixelSize;
     }
-    void setPixelSize(const QSize &set) {
-        m_pixelSize = set;
-    }
 
     void setRawPhysicalSize(const QSize &set) {
         AbstractWaylandOutput::setRawPhysicalSize(set);