From fcc6c6d526cc3d1112f9e36e8e1d2640f61f259d Mon Sep 17 00:00:00 2001
From: Mabel Zhang <mabel@openrobotics.org>
Date: Thu, 20 Aug 2020 12:40:15 -0400
Subject: [PATCH] Qt auto scale factor for HiDPI displays (#291)

Signed-off-by: Mabel Zhang <mabel@openrobotics.org>
---
 src/gui/Gui.cc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/gui/Gui.cc b/src/gui/Gui.cc
index 04340d116d..f3fdd9bbda 100644
--- a/src/gui/Gui.cc
+++ b/src/gui/Gui.cc
@@ -56,6 +56,12 @@ std::unique_ptr<ignition::gui::Application> createGui(
   ignmsg << "Ignition Gazebo GUI    v" << IGNITION_GAZEBO_VERSION_FULL
          << std::endl;
 
+  // Set auto scaling factor for HiDPI displays
+  if (QString::fromLocal8Bit(qgetenv("QT_AUTO_SCREEN_SCALE_FACTOR")).isEmpty())
+  {
+    qputenv("QT_AUTO_SCREEN_SCALE_FACTOR", "1");
+  }
+
   // Initialize Qt app
   auto app = std::make_unique<ignition::gui::Application>(_argc, _argv);
   app->AddPluginPath(IGN_GAZEBO_GUI_PLUGIN_INSTALL_DIR);