Squashed 'NotifyIconWpf/' content from commit 7307bdf

git-subtree-dir: NotifyIconWpf
git-subtree-split: 7307bdf5402239df475ea38a0647901cb4b95645

NotifyIconWpf/Interop/SystemInfo.cs

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+// hardcodet.net NotifyIcon for WPF
+// Copyright (c) 2009 - 2020 Philipp Sumi
+// Contact and Information: http://www.hardcodet.net
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the Code Project Open License (CPOL);
+// either version 1.0 of the License, or (at your option) any later
+// version.
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+//
+// THIS COPYRIGHT NOTICE MAY NOT BE REMOVED FROM THIS FILE
+
+using System.Diagnostics.Contracts;
+using System.Windows.Interop;
+
+namespace Hardcodet.Wpf.TaskbarNotification.Interop
+{
+    /// <summary>
+    /// This class is a helper for system information, currently to get the DPI factors
+    /// </summary>
+    public static class SystemInfo
+    {
+        /// <summary>
+        /// Make sure the initial value is calculated at the first access
+        /// </summary>
+        static SystemInfo()
+        {
+            UpdateDpiFactors();
+        }
+
+        /// <summary>
+        /// This calculates the current DPI values and sets this into the DpiFactorX/DpiFactorY values
+        /// </summary>
+        internal static void UpdateDpiFactors()
+        {
+            using (var source = new HwndSource(new HwndSourceParameters()))
+            {
+                if (source.CompositionTarget?.TransformToDevice != null)
+                {
+                    DpiFactorX = source.CompositionTarget.TransformToDevice.M11;
+                    DpiFactorY = source.CompositionTarget.TransformToDevice.M22;
+                    return;
+                }
+            }
+
+            DpiFactorX = DpiFactorY = 1;
+        }
+
+        /// <summary>
+        /// Returns the DPI X Factor
+        /// </summary>
+        public static double DpiFactorX { get; private set; } = 1;
+
+        /// <summary>
+        /// Returns the DPI Y Factor
+        /// </summary>
+        public static double DpiFactorY { get; private set; } = 1;
+
+        /// <summary>
+        /// Scale the supplied point to the current DPI settings
+        /// </summary>
+        /// <param name="point"></param>
+        /// <returns>Point</returns>
+        [Pure]
+        public static Point ScaleWithDpi(this Point point)
+        {
+            return new Point
+            {
+                X = (int)(point.X / DpiFactorX),
+                Y = (int)(point.Y / DpiFactorY)
+            };
+        }
+    }
+}