Init custom DPI.

src/controller.cpp

@@ -239,3 +239,11 @@ void Controller::postNotification(const QString& roomId, const QString& eventId,
   notificationsManager.postNotification(roomId, eventId, roomName, senderName,
                                         text, icon, iconPath);
 }
+
+int Controller::dpi() {
+  return SettingsGroup("Interface").value("dpi", 100).toInt();
+}
+
+void Controller::setDpi(int dpi) {
+  SettingsGroup("Interface").setValue("dpi", dpi);
+}

src/controller.h

@@ -32,6 +32,9 @@ class Controller : public QObject {
 
   QVector<Connection*> connections() { return m_connections; }
 
+  Q_INVOKABLE int dpi();
+  Q_INVOKABLE void setDpi(int dpi);
+
   // All the non-Q_INVOKABLE functions.
   void addConnection(Connection* c);
   void dropConnection(Connection* c);

src/main.cpp

@@ -23,10 +23,21 @@
 using namespace QMatrixClient;
 
 int main(int argc, char *argv[]) {
-#if defined(Q_OS_WIN)
-  QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
+#if defined(Q_OS_LINUX) || defined(Q_OS_WIN) || defined(Q_OS_FREEBSD)
+  if (qgetenv("QT_SCALE_FACTOR").size() == 0) {
+    QSettings settings("ENCOM", "Spectral");
+    float factor = settings.value("Interface/dpi", 100).toFloat() / 100;
+
+    qDebug() << "DPI:" << factor;
+
+    if (factor != -1)
+      qputenv("QT_SCALE_FACTOR", QString::number(factor).toUtf8());
+  }
 #endif
 
+  QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
+  QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
+
   QApplication app(argc, argv);
 
   app.setOrganizationName("ENCOM");