From 2b237bb8b3d9ef95ef18023053285461b18fc2e7 Mon Sep 17 00:00:00 2001
From: Guofang <uglycat@foxmail.com>
Date: Wed, 28 Oct 2026 15:06:08 +0800
Subject: [PATCH] Add a tool to switch the Windows display scale between 100%
 and 200%

81-Toggle-Scale.ps1 writes LogPixels, Win8DpiScaling and AppliedDPI for
the current user; the change needs a restart, so the .bat launcher offers
to restart at the end. It is picked up by the existing NN-*.bat/.ps1
globs and copied to Desktop\Tools.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
---
 seediso/windows11/81-Toggle-Scale.bat | 21 +++++++++++++++++
 seediso/windows11/81-Toggle-Scale.ps1 | 34 +++++++++++++++++++++++++++
 2 files changed, 55 insertions(+)
 create mode 100644 seediso/windows11/81-Toggle-Scale.bat
 create mode 100644 seediso/windows11/81-Toggle-Scale.ps1

diff --git a/seediso/windows11/81-Toggle-Scale.bat b/seediso/windows11/81-Toggle-Scale.bat
new file mode 100644
index 0000000..502a200
--- /dev/null
+++ b/seediso/windows11/81-Toggle-Scale.bat
@@ -0,0 +1,21 @@
+@echo off
+setlocal
+title Toggle display scale
+
+rem No argument: switch between 100% and 200%. Pass 100 or 200 to force a value.
+rem Runs as the current user (no elevation), because the scale is a per-user setting.
+rem The change takes effect after a restart; the script offers to restart at the end.
+
+set "SCALE=%~1"
+if not defined SCALE set "SCALE=0"
+
+powershell.exe -NoProfile -ExecutionPolicy Bypass -File "%~dp081-Toggle-Scale.ps1" -Scale %SCALE%
+if errorlevel 1 (
+    pause
+    exit /b 1
+)
+
+echo.
+choice /c YN /m "Restart now"
+if errorlevel 2 exit /b 0
+shutdown.exe /r /t 5
diff --git a/seediso/windows11/81-Toggle-Scale.ps1 b/seediso/windows11/81-Toggle-Scale.ps1
new file mode 100644
index 0000000..1796f7a
--- /dev/null
+++ b/seediso/windows11/81-Toggle-Scale.ps1
@@ -0,0 +1,34 @@
+# Switches the display scale between 100% and 200% for the current user.
+# With no argument it toggles; -Scale 100 or -Scale 200 forces a value.
+# The scale is stored in the registry (LogPixels), so the change takes effect only after
+# a restart. Use -Restart to reboot right away.
+param(
+    [ValidateSet(0, 100, 200)]
+    [int]$Scale = 0,
+    [switch]$Restart
+)
+
+$ErrorActionPreference = 'Stop'
+
+$desktopKey = 'HKCU:\Control Panel\Desktop'
+$metricsKey = 'HKCU:\Control Panel\Desktop\WindowMetrics'
+
+$logPixels = (Get-ItemProperty -Path $desktopKey -Name LogPixels -ErrorAction SilentlyContinue).LogPixels
+if (-not $logPixels) { $logPixels = 96 }
+$current = [int][math]::Round($logPixels * 100 / 96)
+
+$target = if ($Scale -ne 0) { $Scale } elseif ($current -eq 100) { 200 } else { 100 }
+$dpi = [int]($target * 96 / 100)
+
+Write-Host "Scale: $current% -> $target%"
+
+# Win8DpiScaling=1 makes Windows use LogPixels instead of the per-monitor recommendation.
+Set-ItemProperty -Path $desktopKey -Name LogPixels -Type DWord -Value $dpi
+Set-ItemProperty -Path $desktopKey -Name Win8DpiScaling -Type DWord -Value 1
+Set-ItemProperty -Path $metricsKey -Name AppliedDPI -Type DWord -Value $dpi
+
+Write-Host 'Restart Windows for the new scale to take effect.'
+if ($Restart) {
+    Write-Host 'Restarting in 5 seconds...'
+    shutdown.exe /r /t 5
+}