From a57b9134505a593f1e5245bd7ad92f811319be46 Mon Sep 17 00:00:00 2001
From: Damien Elmes <git@ichi2.net>
Date: Thu, 10 Aug 2017 15:02:46 +1000
Subject: [PATCH] opt in to qt's full hidpi support

doesn't seem to affect the webviews on Linux, so we need to keep the old
zoom code around for now
---
 aqt/__init__.py | 3 +++
 aqt/webview.py  | 5 ++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/aqt/__init__.py b/aqt/__init__.py
index a0707a191..e8dadf58d 100644
--- a/aqt/__init__.py
+++ b/aqt/__init__.py
@@ -214,6 +214,9 @@ def _run():
         import ctypes
         ctypes.CDLL('libGL.so.1', ctypes.RTLD_GLOBAL)
 
+    # opt in to full hidpi support
+    QCoreApplication.setAttribute(Qt.AA_EnableHighDpiScaling)
+
     # create the app
     app = AnkiApp(sys.argv)
     QCoreApplication.setApplicationName("Anki")
diff --git a/aqt/webview.py b/aqt/webview.py
index 0a6341d26..09d438c81 100644
--- a/aqt/webview.py
+++ b/aqt/webview.py
@@ -6,7 +6,7 @@ import sys
 from anki.hooks import runHook
 from aqt.qt import *
 from aqt.utils import openLink
-from anki.utils import isMac, isWin, devMode
+from anki.utils import isMac, isWin, isLin, devMode
 
 # Page for debug messages
 ##########################################################################
@@ -151,7 +151,10 @@ class AnkiWebView(QWebEngineView):
         if oldFocus:
             oldFocus.setFocus()
 
+    # need to do this manually for Linux as Qt doesn't automatically scale webview
     def zoomFactor(self):
+        if not isLin:
+            return 1
         screen = QApplication.desktop().screen()
         dpi = screen.logicalDpiX()
         return max(1, dpi / 96.0)