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;
    }
}
