From 06dd1081012155e77a0c014fa8ae14aec1ecc73d Mon Sep 17 00:00:00 2001
From: walterlv <xblero@gmail.com>
Date: Fri, 21 Aug 2026 10:18:13 +0800
Subject: [PATCH] Fix Per-Monitor DPI awareness issue, now support Per-Monitor
 (V2). See:
 https://blog.walterlv.com/post/windows-high-dpi-development-for-wpf.html

---
 QuickLook/App.config                 |  4 ++--
 QuickLook/App.xaml.cs                | 11 ----------
 QuickLook/NativeMethods/SHCore.cs    | 33 ----------------------------
 QuickLook/Properties/AssemblyInfo.cs |  4 ----
 QuickLook/app.manifest               | 11 +++++-----
 5 files changed, 8 insertions(+), 55 deletions(-)
 delete mode 100644 QuickLook/NativeMethods/SHCore.cs

diff --git a/QuickLook/App.config b/QuickLook/App.config
index ea4e4a2e6..becd609fe 100644
--- a/QuickLook/App.config
+++ b/QuickLook/App.config
@@ -4,8 +4,8 @@
     <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.2" />
   </startup>
   <runtime>
-    <AppContextSwitchOverrides value="Switch.System.IO.UseLegacyPathHandling=false;Switch.System.IO.BlockLongPaths=false" />
+    <AppContextSwitchOverrides value="Switch.System.IO.UseLegacyPathHandling=false;Switch.System.IO.BlockLongPaths=false;Switch.System.Windows.DoNotScaleForDpiChanges=false" />
     <legacyCorruptedStateExceptionsPolicy enabled="true" />
     <legacyUnhandledExceptionPolicy enabled="1" />
   </runtime>
-</configuration>
\ No newline at end of file
+</configuration>
diff --git a/QuickLook/App.xaml.cs b/QuickLook/App.xaml.cs
index 9184585ff..5aabc8268 100644
--- a/QuickLook/App.xaml.cs
+++ b/QuickLook/App.xaml.cs
@@ -20,7 +20,6 @@
 using QuickLook.NativeMethods;
 using System;
 using System.Collections.Generic;
-using System.Diagnostics;
 using System.IO;
 using System.Linq;
 using System.Reflection;
@@ -60,16 +59,6 @@ static App()
             RenderOptions.ProcessRenderMode = RenderMode.SoftwareOnly;
         }
 
-        // Explicitly set to PerMonitor to avoid being overridden by the system
-        if (SHCore.SetProcessDpiAwareness(SHCore.PROCESS_DPI_AWARENESS.PROCESS_PER_MONITOR_DPI_AWARE) is uint result)
-        {
-            Debug.WriteLine(
-                result == 0 ?
-                "DPI Awareness applied successfully" :
-                $"DPI Awareness manual setup failed. Error Code: {result}"
-            );
-        }
-
         // Occurs when the resolution of an assembly fails
         AppDomain.CurrentDomain.AssemblyResolve += (_, e) =>
         {
diff --git a/QuickLook/NativeMethods/SHCore.cs b/QuickLook/NativeMethods/SHCore.cs
deleted file mode 100644
index ec5bf304b..000000000
--- a/QuickLook/NativeMethods/SHCore.cs
+++ /dev/null
@@ -1,33 +0,0 @@
-// Copyright © 2017-2026 QL-Win Contributors
-//
-// This file is part of QuickLook program.
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-using System.Runtime.InteropServices;
-
-namespace QuickLook.NativeMethods;
-
-internal static class SHCore
-{
-    public enum PROCESS_DPI_AWARENESS
-    {
-        PROCESS_DPI_UNAWARE,
-        PROCESS_SYSTEM_DPI_AWARE,
-        PROCESS_PER_MONITOR_DPI_AWARE
-    }
-
-    [DllImport("shcore.dll")]
-    public static extern uint SetProcessDpiAwareness(PROCESS_DPI_AWARENESS awareness);
-}
diff --git a/QuickLook/Properties/AssemblyInfo.cs b/QuickLook/Properties/AssemblyInfo.cs
index a079d812a..e35fc4ade 100644
--- a/QuickLook/Properties/AssemblyInfo.cs
+++ b/QuickLook/Properties/AssemblyInfo.cs
@@ -18,7 +18,6 @@
 using System.Reflection;
 using System.Runtime.InteropServices;
 using System.Windows;
-using System.Windows.Media;
 
 // General Information about an assembly is controlled through the following
 // set of attributes. Change these attribute values to modify the information
@@ -65,6 +64,3 @@
 // You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-
-// If .NET Version is higher than 4.6.2 (Not include 4.6.2), use the following line
-// [assembly: DisableDpiAwareness]
diff --git a/QuickLook/app.manifest b/QuickLook/app.manifest
index acf296f7c..6b9f0b545 100644
--- a/QuickLook/app.manifest
+++ b/QuickLook/app.manifest
@@ -53,14 +53,15 @@
 
   <application xmlns="urn:schemas-microsoft-com:asm.v3">
     <windowsSettings>
-      <!-- The combination of below two tags have the following effect : 1) Per-Monitor for >= Windows 10 Anniversary Update 2) System < Windows 10 Anniversary Update -->
-      <!--<dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">PerMonitor</dpiAwareness>-->
-      <!--<dpiAware xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">true</dpiAware>-->
+      <!-- The combination of below two tags have the following effect :
+           1. Per-Monitor V2 for >= Windows 10 1703
+           2. System < Windows 10 1703 -->
+      <dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">PerMonitorV2</dpiAwareness>
+      <dpiAware xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">true</dpiAware>
       <longPathAware xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">true</longPathAware>
     </windowsSettings>
   </application>
 
-
   <!-- Enable themes for Windows common controls and dialogs (Windows XP and later) -->
   <!--
   <dependency>
@@ -77,4 +78,4 @@
   </dependency>
   -->
 
-</assembly>
\ No newline at end of file
+</assembly>