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/**************************************************************************\
Copyright Microsoft Corporation. All Rights Reserved.
\**************************************************************************/
namespace Standard
{
using System;
using System.Diagnostics.CodeAnalysis;
using System.Windows;
using System.Windows.Media;
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);
}
/// <summary>
/// Convert a point in system coordinates to a point in device independent pixels (1/96").
/// </summary>
/// <param name="logicalPoint">A point in the physical coordinate system.</param>
/// <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);
}
[SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
public static Rect LogicalRectToDevice(Rect logicalRectangle, double dpiScaleX, double dpiScaleY)
{
Point topLeft = LogicalPixelsToDevice(new Point(logicalRectangle.Left, logicalRectangle.Top), dpiScaleX, dpiScaleY);
Point bottomRight = LogicalPixelsToDevice(new Point(logicalRectangle.Right, logicalRectangle.Bottom), dpiScaleX, dpiScaleY);
return new Rect(topLeft, bottomRight);
}
public static Rect DeviceRectToLogical(Rect deviceRectangle, double dpiScaleX, double dpiScaleY)
{
Point topLeft = DevicePixelsToLogical(new Point(deviceRectangle.Left, deviceRectangle.Top), dpiScaleX, dpiScaleY);
Point bottomRight = DevicePixelsToLogical(new Point(deviceRectangle.Right, deviceRectangle.Bottom), dpiScaleX, dpiScaleY);
return new Rect(topLeft, bottomRight);
}
[SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
public static Size LogicalSizeToDevice(Size logicalSize, double dpiScaleX, double dpiScaleY)
{
Point pt = LogicalPixelsToDevice(new Point(logicalSize.Width, logicalSize.Height), dpiScaleX, dpiScaleY);
return new Size { Width = pt.X, Height = pt.Y };
}
public static Size DeviceSizeToLogical(Size deviceSize, double dpiScaleX, double dpiScaleY)
{
Point pt = DevicePixelsToLogical(new Point(deviceSize.Width, deviceSize.Height), dpiScaleX, dpiScaleY);
return new Size(pt.X, pt.Y);
}
public static Thickness LogicalThicknessToDevice(Thickness logicalThickness, double dpiScaleX, double dpiScaleY)
{
Point topLeft = LogicalPixelsToDevice(new Point(logicalThickness.Left, logicalThickness.Top), dpiScaleX, dpiScaleY);
Point bottomRight = LogicalPixelsToDevice(new Point(logicalThickness.Right, logicalThickness.Bottom), dpiScaleX, dpiScaleY);
return new Thickness(topLeft.X, topLeft.Y, bottomRight.X, bottomRight.Y);
}
}
}
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