MacOS: ensure 1:1 rendering on HiDPI screens (#23860)

selfdrive/ui/installer/installer.cc

@@ -221,7 +221,7 @@ void Installer::cloneFinished(int exitCode, QProcess::ExitStatus exitStatus) {
 }
 
 int main(int argc, char *argv[]) {
-  initApp();
+  initApp(argc, argv);
   QApplication a(argc, argv);
   Installer installer;
   setMainWindow(&installer);

selfdrive/ui/main.cc

@@ -12,7 +12,7 @@ int main(int argc, char *argv[]) {
   setpriority(PRIO_PROCESS, 0, -20);
 
   qInstallMessageHandler(swagLogMessageHandler);
-  initApp();
+  initApp(argc, argv);
 
   if (Hardware::EON()) {
     QSslConfiguration ssl = QSslConfiguration::defaultConfiguration();

selfdrive/ui/qt/setup/updater.cc

@@ -190,7 +190,7 @@ bool Updater::eventFilter(QObject *obj, QEvent *event) {
 }
 
 int main(int argc, char *argv[]) {
-  initApp();
+  initApp(argc, argv);
   QApplication a(argc, argv);
   Updater updater(argv[1], argv[2]);
   setMainWindow(&updater);

selfdrive/ui/qt/spinner.cc

@@ -111,7 +111,7 @@ void Spinner::update(int n) {
 }
 
 int main(int argc, char *argv[]) {
-  initApp();
+  initApp(argc, argv);
   QApplication a(argc, argv);
   Spinner spinner;
   setMainWindow(&spinner);

selfdrive/ui/qt/text.cc

@@ -11,7 +11,7 @@
 #include "selfdrive/ui/qt/widgets/scrollview.h"
 
 int main(int argc, char *argv[]) {
-  initApp();
+  initApp(argc, argv);
   QApplication a(argc, argv);
   QWidget window;
   setMainWindow(&window);

selfdrive/ui/qt/util.cc

@@ -89,9 +89,18 @@ void setQtSurfaceFormat() {
   QSurfaceFormat::setDefaultFormat(fmt);
 }
 
-void initApp() {
+void initApp(int argc, char *argv[]) {
   Hardware::set_display_power(true);
   Hardware::set_brightness(65);
+
+#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();
   if (Hardware::EON()) {
     QApplication::setAttribute(Qt::AA_ShareOpenGLContexts);

selfdrive/ui/qt/util.h

@@ -19,6 +19,6 @@ void clearLayout(QLayout* layout);
 void setQtSurfaceFormat();
 QString timeAgo(const QDateTime &date);
 void swagLogMessageHandler(QtMsgType type, const QMessageLogContext &context, const QString &msg);
-void initApp();
+void initApp(int argc, char *argv[]);
 QWidget* topWidget (QWidget* widget);
 QPixmap loadPixmap(const QString &fileName, const QSize &size = {}, Qt::AspectRatioMode aspectRatioMode = Qt::KeepAspectRatio);

selfdrive/ui/watch3.cc

@@ -6,7 +6,7 @@
 #include "selfdrive/ui/qt/widgets/cameraview.h"
 
 int main(int argc, char *argv[]) {
-  setQtSurfaceFormat();
+  initApp(argc, argv);
 
   QApplication a(argc, argv);
   QWidget w;