cabana: enable Hi-DPI support on MacOS (#27965)

selfdrive/ui/qt/util.cc

@@ -110,7 +110,7 @@ void sigTermHandler(int s) {
   qApp->quit();
 }
 
-void initApp(int argc, char *argv[]) {
+void initApp(int argc, char *argv[], bool disable_hidpi) {
   Hardware::set_display_power(true);
   Hardware::set_brightness(65);
 
@@ -118,13 +118,13 @@ void initApp(int argc, char *argv[]) {
   std::signal(SIGINT, sigTermHandler);
   std::signal(SIGTERM, sigTermHandler);
 
+  if (disable_hidpi) {
 #ifdef __APPLE__
-  {
     // Get the devicePixelRatio, and scale accordingly to maintain 1:1 rendering
     QApplication tmp(argc, argv);
     qputenv("QT_SCALE_FACTOR", QString::number(1.0 / tmp.devicePixelRatio() ).toLocal8Bit());
-  }
 #endif
+  }
 
   setQtSurfaceFormat();
 }

selfdrive/ui/qt/util.h

@@ -19,7 +19,7 @@ void clearLayout(QLayout* layout);
 void setQtSurfaceFormat();
 QString timeAgo(const QDateTime &date);
 void swagLogMessageHandler(QtMsgType type, const QMessageLogContext &context, const QString &msg);
-void initApp(int argc, char *argv[]);
+void initApp(int argc, char *argv[], bool disable_hidpi = true);
 QWidget* topWidget (QWidget* widget);
 QPixmap loadPixmap(const QString &fileName, const QSize &size = {}, Qt::AspectRatioMode aspectRatioMode = Qt::KeepAspectRatio);
 QPixmap bootstrapPixmap(const QString &id);

tools/cabana/cabana.cc

@@ -12,7 +12,7 @@
 int main(int argc, char *argv[]) {
   QCoreApplication::setApplicationName("Cabana");
   QCoreApplication::setAttribute(Qt::AA_ShareOpenGLContexts);
-  initApp(argc, argv);
+  initApp(argc, argv, false);
   QApplication app(argc, argv);
   app.setApplicationDisplayName("Cabana");
   app.setWindowIcon(QIcon(":cabana-icon.png"));