From 2229c1691a44219664898790ab911eac883a5d60 Mon Sep 17 00:00:00 2001
From: Copilot <198982749+Copilot@users.noreply.github.com>
Date: Wed, 15 Apr 2026 00:24:21 +0800
Subject: [PATCH] Align Acrylic10 tint behavior with official dark/light
 acrylic palette (#1915)

* Initial plan

* Align Acrylic10 tint color and opacity with official dark/light values

Agent-Logs-Url: https://github.com/QL-Win/QuickLook/sessions/7856deeb-578c-4683-879b-e2d924eb4224

Co-authored-by: emako <24737061+emako@users.noreply.github.com>

* Refine Acrylic10 constants for tint palette and opacity

Agent-Logs-Url: https://github.com/QL-Win/QuickLook/sessions/7856deeb-578c-4683-879b-e2d924eb4224

Co-authored-by: emako <24737061+emako@users.noreply.github.com>

* Narrow color parsing exception handling in ViewerWindow

Agent-Logs-Url: https://github.com/QL-Win/QuickLook/sessions/7856deeb-578c-4683-879b-e2d924eb4224

Co-authored-by: emako <24737061+emako@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: emako <24737061+emako@users.noreply.github.com>
---
 QuickLook.Common/Helpers/WindowHelper.cs |  4 +--
 QuickLook/ViewerWindow.xaml.cs           | 31 +++++++++++++++++++++---
 2 files changed, 29 insertions(+), 6 deletions(-)

diff --git a/QuickLook.Common/Helpers/WindowHelper.cs b/QuickLook.Common/Helpers/WindowHelper.cs
index 2c13af1..f9475f7 100644
--- a/QuickLook.Common/Helpers/WindowHelper.cs
+++ b/QuickLook.Common/Helpers/WindowHelper.cs
@@ -168,7 +168,7 @@ public static class WindowHelper
         Marshal.FreeHGlobal(accentPtr);
     }
 
-    public static void EnableAcrylicBlur(Window window, Color tintColor, bool isDarkTheme)
+    public static void EnableAcrylicBlur(Window window, Color tintColor, bool isDarkTheme, double tintOpacity = 0.8)
     {
         window.Background = Brushes.Transparent;
 
@@ -193,7 +193,7 @@ public static class WindowHelper
         var accent = new AccentPolicy();
         var accentStructSize = Marshal.SizeOf(accent);
         accent.AccentState = AccentState.AccentEnableAcrylicblurbehind;
-        accent.GradientColor = ToAbgr(tintColor, 0.8);
+        accent.GradientColor = ToAbgr(tintColor, tintOpacity);
 
         var accentPtr = Marshal.AllocHGlobal(accentStructSize);
         Marshal.StructureToPtr(accent, accentPtr, false);
diff --git a/QuickLook/ViewerWindow.xaml.cs b/QuickLook/ViewerWindow.xaml.cs
index bd96dec..44b4d01 100644
--- a/QuickLook/ViewerWindow.xaml.cs
+++ b/QuickLook/ViewerWindow.xaml.cs
@@ -41,6 +41,10 @@ namespace QuickLook;
 
 public partial class ViewerWindow : Window
 {
+    private const double Acrylic10TintOpacity = 0.7;
+    private static readonly Color Acrylic10DarkTintColor = Color.FromRgb(0x17, 0x17, 0x17);
+    private static readonly Color Acrylic10LightTintColor = Color.FromRgb(0xF2, 0xF2, 0xF2);
+
     private Size _customWindowSize = Size.Empty;
     private bool _ignoreNextWindowSizeChange;
     private string _path = string.Empty;
@@ -204,7 +208,7 @@ public partial class ViewerWindow : Window
             {
                 Background = (Brush)new BrushConverter().ConvertFromString(customColor);
             }
-            catch
+            catch (Exception ex) when (ex is FormatException || ex is NotSupportedException)
             {
                 // Ignore invalid color
             }
@@ -279,11 +283,11 @@ public partial class ViewerWindow : Window
             case SystembackdropType.Acrylic10:
                 if (App.IsWin10 || App.IsWin11)
                 {
-                    var acrylicTint = GetAcrylicTintColor();
+                    var acrylicTint = GetAcrylic10TintColor();
 
                     WindowChrome.GetWindowChrome(this)?.GlassFrameThickness = new Thickness(0d);
                     WindowHelper.DisableDwmBlur(this); // Restore rounded corners on Windows 11
-                    WindowHelper.EnableAcrylicBlur(this, acrylicTint, CurrentTheme == Themes.Dark);
+                    WindowHelper.EnableAcrylicBlur(this, acrylicTint, CurrentTheme == Themes.Dark, Acrylic10TintOpacity);
                     Background = Brushes.Transparent;
                 }
                 else
@@ -356,7 +360,7 @@ public partial class ViewerWindow : Window
             {
                 return ((SolidColorBrush)new BrushConverter().ConvertFromString(customColor)).Color;
             }
-            catch
+            catch (Exception ex) when (ex is FormatException || ex is NotSupportedException)
             {
                 // Ignore invalid color
             }
@@ -365,6 +369,25 @@ public partial class ViewerWindow : Window
         return ((SolidColorBrush)FindResource("MainWindowBackground")).Color;
     }
 
+    private Color GetAcrylic10TintColor()
+    {
+        var customColor = SettingHelper.Get("WindowBackgroundColor", string.Empty, "QuickLook");
+
+        if (!string.IsNullOrEmpty(customColor))
+        {
+            try
+            {
+                return ((SolidColorBrush)new BrushConverter().ConvertFromString(customColor)).Color;
+            }
+            catch (Exception ex) when (ex is FormatException || ex is NotSupportedException)
+            {
+                // Ignore invalid color
+            }
+        }
+
+        return CurrentTheme == Themes.Dark ? Acrylic10DarkTintColor : Acrylic10LightTintColor;
+    }
+
     private static SystembackdropType GetBackdropOption()
     {
         var option = SettingHelper.Get("WindowBackdrop", nameof(SystembackdropType.Auto), "QuickLook")?.Trim();