dotnet
diff --git a/‎src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Standard/DpiHelper.cs
Lines changed: 6 additions & 11 deletions b/‎src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Standard/DpiHelper.cs
Lines changed: 6 additions & 11 deletions
@@ -13,21 +13,16 @@ namespace Standard
 
     internal static class DpiHelper
     {
-        [ThreadStatic]
-        private static Matrix _transformToDevice;
-        [ThreadStatic]
-        private static Matrix _transformToDip;
-
         /// <summary>
         /// Convert a point in device independent pixels (1/96") to a point in the system coordinates.
         /// </summary>
         /// <param name="logicalPoint">A point in the logical coordinate system.</param>
         /// <returns>Returns the parameter converted to the system's coordinates.</returns>
         public static Point LogicalPixelsToDevice(Point logicalPoint, double dpiScaleX, double dpiScaleY)
         {
-            _transformToDevice = Matrix.Identity;
-            _transformToDevice.Scale(dpiScaleX, dpiScaleY);
-            return _transformToDevice.Transform(logicalPoint);
+            Matrix transformToDevice = Matrix.Identity;
+            transformToDevice.Scale(dpiScaleX, dpiScaleY);
+            return transformToDevice.Transform(logicalPoint);
         }
 
         /// <summary>
@@ -37,9 +32,9 @@ public static Point LogicalPixelsToDevice(Point logicalPoint, double dpiScaleX,
         /// <returns>Returns the parameter converted to the device independent coordinate system.</returns>
         public static Point DevicePixelsToLogical(Point devicePoint, double dpiScaleX, double dpiScaleY)
         {
-            _transformToDip = Matrix.Identity;
-            _transformToDip.Scale(1d / dpiScaleX, 1d / dpiScaleY);
-            return _transformToDip.Transform(devicePoint);
+            Matrix transformToDip = Matrix.Identity;
+            transformToDip.Scale(1d / dpiScaleX, 1d / dpiScaleY);
+            return transformToDip.Transform(devicePoint);
         }
 
         [SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]