static DpiHelper()
{
var dC = InteropMethods.GetDC(IntPtr.Zero);
if (dC != IntPtr.Zero)
{
// 沿着屏幕宽度每逻辑英寸的像素数。在具有多个显示器的系统中，这个值对所有显示器都是相同的
const int logicPixelsX = 88;
// 沿着屏幕高度每逻辑英寸的像素数
const int logicPixelsY = 90;
DeviceDpiX = InteropMethods.GetDeviceCaps(dC, logicPixelsX);
DeviceDpiY = InteropMethods.GetDeviceCaps(dC, logicPixelsY);
InteropMethods.ReleaseDC(IntPtr.Zero, dC);
}
else
{
DeviceDpiX = LogicalDpi;
DeviceDpiY = LogicalDpi;
}
var identity = Matrix.Identity;
var identity2 = Matrix.Identity;
identity.Scale(DeviceDpiX / LogicalDpi, DeviceDpiY / LogicalDpi);
identity2.Scale(LogicalDpi / DeviceDpiX, LogicalDpi / DeviceDpiY);
TransformFromDevice = new MatrixTransform(identity2);
TransformFromDevice.Freeze();
TransformToDevice = new MatrixTransform(identity);
TransformToDevice.Freeze();
}
private static void EnsureSystemMetrics()
{
if (SystemBitDepth == 0)
{
var hdcDesktop = new HandleRef(null, InteropMethods.GetDC(new HandleRef()));
try
{
var sysBitDepth = InteropMethods.GetDeviceCaps(hdcDesktop, InteropValues.BITSPIXEL);
sysBitDepth *= InteropMethods.GetDeviceCaps(hdcDesktop, InteropValues.PLANES);
if (sysBitDepth == 8)
{
sysBitDepth = 4;
}
var cxSmallIcon = InteropMethods.GetSystemMetrics(InteropValues.SM.CXSMICON);
var cySmallIcon = InteropMethods.GetSystemMetrics(InteropValues.SM.CYSMICON);
var cxIcon = InteropMethods.GetSystemMetrics(InteropValues.SM.CXICON);
var cyIcon = InteropMethods.GetSystemMetrics(InteropValues.SM.CYICON);
SmallIconSize = new Size(cxSmallIcon, cySmallIcon);
IconSize = new Size(cxIcon, cyIcon);
SystemBitDepth = sysBitDepth;
}
finally
{
InteropMethods.ReleaseDC(new HandleRef(), hdcDesktop);
}
}
}
static DpiHelper()
{
var dC = InteropMethods.GetDC(IntPtr.Zero);
if (dC != IntPtr.Zero)
{
DeviceDpiX = InteropMethods.GetDeviceCaps(dC, 88);
DeviceDpiY = InteropMethods.GetDeviceCaps(dC, 90);
InteropMethods.ReleaseDC(IntPtr.Zero, dC);
}
else
{
DeviceDpiX = LogicalDpi;
DeviceDpiY = LogicalDpi;
}
var identity = Matrix.Identity;
var identity2 = Matrix.Identity;
identity.Scale(DeviceDpiX / LogicalDpi, DeviceDpiY / LogicalDpi);
identity2.Scale(LogicalDpi / DeviceDpiX, LogicalDpi / DeviceDpiY);
TransformFromDevice = new MatrixTransform(identity2);
TransformFromDevice.Freeze();
TransformToDevice = new MatrixTransform(identity);
TransformToDevice.Freeze();
}