eglfs: Add basic support for controlling how the virtual desktop is formed

Choose between horizontal (default) and vertical.

Task-number: QTBUG-55188
Change-Id: Ibc490b0ad8c60b66db785455c57987eb8afdad0d
Reviewed-by: Dominik Holland <dominik.holland@pelagicore.com>
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_support/qeglfskmsdevice.cpp

@@ -373,7 +373,12 @@ void QEglFSKmsDevice::createScreens()
         QEglFSKmsScreen *screen = createScreenForConnector(resources, connector, pos);
         if (screen) {
             integration->addScreen(screen);
+
+            if (m_integration->virtualDesktopLayout() == QEglFSKmsIntegration::VirtualDesktopLayoutVertical)
+                pos.ry() += screen->geometry().height();
+            else
                 pos.rx() += screen->geometry().width();
+
             siblings << screen;
 
             if (!primaryScreen)

src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_support/qeglfskmsintegration.cpp

@@ -65,6 +65,7 @@ QEglFSKmsIntegration::QEglFSKmsIntegration()
     , m_hwCursor(false)
     , m_pbuffers(false)
     , m_separateScreens(false)
+    , m_virtualDesktopLayout(VirtualDesktopLayoutHorizontal)
 {}
 
 void QEglFSKmsIntegration::platformInit()
@@ -149,6 +150,11 @@ bool QEglFSKmsIntegration::separateScreens() const
     return m_separateScreens;
 }
 
+QEglFSKmsIntegration::VirtualDesktopLayout QEglFSKmsIntegration::virtualDesktopLayout() const
+{
+    return m_virtualDesktopLayout;
+}
+
 QMap<QString, QVariantMap> QEglFSKmsIntegration::outputSettings() const
 {
     return m_outputSettings;
@@ -169,14 +175,14 @@ void QEglFSKmsIntegration::loadConfig()
 
     QFile file(QString::fromUtf8(json));
     if (!file.open(QFile::ReadOnly)) {
-        qCDebug(qLcEglfsKmsDebug) << "Could not open config file"
+        qCWarning(qLcEglfsKmsDebug) << "Could not open config file"
                                     << json << "for reading";
         return;
     }
 
     const QJsonDocument doc = QJsonDocument::fromJson(file.readAll());
     if (!doc.isObject()) {
-        qCDebug(qLcEglfsKmsDebug) << "Invalid config file" << json
+        qCWarning(qLcEglfsKmsDebug) << "Invalid config file" << json
                                     << "- no top-level JSON object";
         return;
     }
@@ -188,6 +194,16 @@ void QEglFSKmsIntegration::loadConfig()
     m_devicePath = object.value(QLatin1String("device")).toString();
     m_separateScreens = object.value(QLatin1String("separateScreens")).toBool(m_separateScreens);
 
+    const QString vdOriString = object.value(QLatin1String("virtualDesktopLayout")).toString();
+    if (!vdOriString.isEmpty()) {
+        if (vdOriString == QLatin1String("horizontal"))
+            m_virtualDesktopLayout = VirtualDesktopLayoutHorizontal;
+        else if (vdOriString == QLatin1String("vertical"))
+            m_virtualDesktopLayout = VirtualDesktopLayoutVertical;
+        else
+            qCWarning(qLcEglfsKmsDebug) << "Unknown virtualDesktop value" << vdOriString;
+    }
+
     const QJsonArray outputs = object.value(QLatin1String("outputs")).toArray();
     for (int i = 0; i < outputs.size(); i++) {
         const QVariantMap outputSettings = outputs.at(i).toObject().toVariantMap();
@@ -207,6 +223,7 @@ void QEglFSKmsIntegration::loadConfig()
                               << "\thwcursor:" << m_hwCursor << "\n"
                               << "\tpbuffers:" << m_pbuffers << "\n"
                               << "\tseparateScreens:" << m_separateScreens << "\n"
+                              << "\tvirtualDesktopLayout:" << m_virtualDesktopLayout << "\n"
                               << "\toutputs:" << m_outputSettings;
 }
 

src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_support/qeglfskmsintegration.h

@@ -56,6 +56,11 @@ Q_EGLFS_EXPORT Q_DECLARE_LOGGING_CATEGORY(qLcEglfsKmsDebug)
 class Q_EGLFS_EXPORT QEglFSKmsIntegration : public QEglFSDeviceIntegration
 {
 public:
+    enum VirtualDesktopLayout {
+        VirtualDesktopLayoutHorizontal,
+        VirtualDesktopLayoutVertical
+    };
+
     QEglFSKmsIntegration();
 
     void platformInit() Q_DECL_OVERRIDE;
@@ -70,6 +75,7 @@ public:
 
     virtual bool hwCursor() const;
     virtual bool separateScreens() const;
+    virtual VirtualDesktopLayout virtualDesktopLayout() const;
     QMap<QString, QVariantMap> outputSettings() const;
 
     QEglFSKmsDevice *device() const;
@@ -83,6 +89,7 @@ protected:
     bool m_hwCursor;
     bool m_pbuffers;
     bool m_separateScreens;
+    VirtualDesktopLayout m_virtualDesktopLayout;
     QString m_devicePath;
     QMap<QString, QVariantMap> m_outputSettings;
 };