From e867a3575a67f5292fc72c2aea8edeacaf3963a1 Mon Sep 17 00:00:00 2001
From: Dan Walmsley <dan@walms.co.uk>
Date: Sun, 5 Jul 2020 11:51:25 -0300
Subject: [PATCH] add AcrylicPlatformCompensationLevels.

---
 .../AcrylicPlatformCompensationLevels.cs         | 16 ++++++++++++++++
 src/Avalonia.Controls/Platform/ITopLevelImpl.cs  |  5 +++++
 2 files changed, 21 insertions(+)
 create mode 100644 src/Avalonia.Controls/AcrylicPlatformCompensationLevels.cs

diff --git a/src/Avalonia.Controls/AcrylicPlatformCompensationLevels.cs b/src/Avalonia.Controls/AcrylicPlatformCompensationLevels.cs
new file mode 100644
index 0000000000..13dc736463
--- /dev/null
+++ b/src/Avalonia.Controls/AcrylicPlatformCompensationLevels.cs
@@ -0,0 +1,16 @@
+namespace Avalonia.Controls
+{
+    /// <summary>
+    /// Defines compensation levels for the platform depending on the transparency level.
+    /// It controls the base opacity level of the 'tracing paper' layer that compensates
+    /// for low blur radius.
+    /// </summary>
+    public struct AcrylicPlatformCompensationLevels
+    {
+        public double TransparentLevel { get; }
+
+        public double BlurLevel { get; }
+
+        public double AcrylicBlurLevel { get; }
+    }
+}
diff --git a/src/Avalonia.Controls/Platform/ITopLevelImpl.cs b/src/Avalonia.Controls/Platform/ITopLevelImpl.cs
index 6472fba48e..0d77cbf802 100644
--- a/src/Avalonia.Controls/Platform/ITopLevelImpl.cs
+++ b/src/Avalonia.Controls/Platform/ITopLevelImpl.cs
@@ -127,5 +127,10 @@ namespace Avalonia.Platform
         /// Gets the current <see cref="WindowTransparencyLevel"/> of the TopLevel.
         /// </summary>
         WindowTransparencyLevel TransparencyLevel { get; }
+
+        /// <summary>
+        /// Gets the <see cref="AcrylicPlatformCompensationLevels"/> for the platform.        
+        /// </summary>
+        AcrylicPlatformCompensationLevels AcrylicCompensationLevels { get; }
     }
 }