File 0001-Fix-platform-detection-for-EnableHiDPI.patch of Package sddm

From 70b1059cebd0bc98d1545a7a702c1c1779286c42 Mon Sep 17 00:00:00 2001
From: Fabian Vogt <fabian@ritter-vogt.de>
Date: Thu, 8 Mar 2018 10:47:03 +0100
Subject: [PATCH] Fix platform detection for EnableHiDPI

We can't use QGuiApplication before it's constructed, so find out which
platform is requested ourselves.

Fixes #894
---
 src/greeter/GreeterApp.cpp | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/src/greeter/GreeterApp.cpp b/src/greeter/GreeterApp.cpp
index 1230efa..5181e4e 100644
--- a/src/greeter/GreeterApp.cpp
+++ b/src/greeter/GreeterApp.cpp
@@ -278,11 +278,27 @@ int main(int argc, char **argv)
     // Install message handler
     qInstallMessageHandler(SDDM::GreeterMessageHandler);
 
+    // We set an attribute based on the platform we run on.
+    // We only know the platform after we constructed QGuiApplication
+    // though, so we need to find it out ourselves.
+    QLatin1String platform;
+    for (int i = 1; i < argc - 1; ++i) {
+        if(qstrcmp(argv[i], "-platform") == 0) {
+            platform = QLatin1String(argv[i + 1]);
+        }
+    }
+    if (platform.isEmpty()) {
+        platform = QLatin1String(qgetenv("QT_QPA_PLATFORM"));
+    }
+    if (platform.isEmpty()) {
+        platform = QLatin1String("xcb");
+    }
+
     // HiDPI
     bool hiDpiEnabled = false;
-    if (QGuiApplication::platformName() == QLatin1String("xcb"))
+    if (platform == QLatin1String("xcb"))
         hiDpiEnabled = SDDM::mainConfig.X11.EnableHiDPI.get();
-    else if (QGuiApplication::platformName().startsWith(QLatin1String("wayland")))
+    else if (platform.startsWith(QLatin1String("wayland")))
         hiDpiEnabled = SDDM::mainConfig.Wayland.EnableHiDPI.get();
     if (hiDpiEnabled) {
         qDebug() << "High-DPI autoscaling Enabled";
-- 
2.16.1