porting shell from nuget to local

src/Shared/Microsoft.Windows.Shell/Standard/DpiHelper.cs

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+using System;
+using System.Diagnostics.CodeAnalysis;
+using System.Windows;
+using System.Windows.Media;
+
+namespace Standard
+{
+	internal static class DpiHelper
+	{
+		[SuppressMessage("Microsoft.Performance", "CA1810:InitializeReferenceTypeStaticFieldsInline")]
+		static DpiHelper()
+		{
+			using (SafeDC desktop = SafeDC.GetDesktop())
+			{
+				int deviceCaps = NativeMethods.GetDeviceCaps(desktop, DeviceCap.LOGPIXELSX);
+				int deviceCaps2 = NativeMethods.GetDeviceCaps(desktop, DeviceCap.LOGPIXELSY);
+				DpiHelper._transformToDip = Matrix.Identity;
+				DpiHelper._transformToDip.Scale(96.0 / (double)deviceCaps, 96.0 / (double)deviceCaps2);
+				DpiHelper._transformToDevice = Matrix.Identity;
+				DpiHelper._transformToDevice.Scale((double)deviceCaps / 96.0, (double)deviceCaps2 / 96.0);
+			}
+		}
+
+		public static Point LogicalPixelsToDevice(Point logicalPoint)
+		{
+			return DpiHelper._transformToDevice.Transform(logicalPoint);
+		}
+
+		public static Point DevicePixelsToLogical(Point devicePoint)
+		{
+			return DpiHelper._transformToDip.Transform(devicePoint);
+		}
+
+		[SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+		public static Rect LogicalRectToDevice(Rect logicalRectangle)
+		{
+			Point point = DpiHelper.LogicalPixelsToDevice(new Point(logicalRectangle.Left, logicalRectangle.Top));
+			Point point2 = DpiHelper.LogicalPixelsToDevice(new Point(logicalRectangle.Right, logicalRectangle.Bottom));
+			return new Rect(point, point2);
+		}
+
+		public static Rect DeviceRectToLogical(Rect deviceRectangle)
+		{
+			Point point = DpiHelper.DevicePixelsToLogical(new Point(deviceRectangle.Left, deviceRectangle.Top));
+			Point point2 = DpiHelper.DevicePixelsToLogical(new Point(deviceRectangle.Right, deviceRectangle.Bottom));
+			return new Rect(point, point2);
+		}
+
+		[SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+		public static Size LogicalSizeToDevice(Size logicalSize)
+		{
+			Point point = DpiHelper.LogicalPixelsToDevice(new Point(logicalSize.Width, logicalSize.Height));
+			return new Size
+			{
+				Width = point.X,
+				Height = point.Y
+			};
+		}
+
+		public static Size DeviceSizeToLogical(Size deviceSize)
+		{
+			Point point = DpiHelper.DevicePixelsToLogical(new Point(deviceSize.Width, deviceSize.Height));
+			return new Size(point.X, point.Y);
+		}
+
+		private static Matrix _transformToDevice;
+
+		private static Matrix _transformToDip;
+	}
+}