/// <summary>
/// Creates a WindowsGraphics from a memory DeviceContext object compatible with the primary screen device.
/// This object is suitable for performing text measuring but not for drawing into it because it does
/// not have a backup bitmap.
/// </summary>
public static WindowsGraphics CreateMeasurementWindowsGraphics()
{
DeviceContext dc = DeviceContext.FromCompatibleDC(IntPtr.Zero);
return(new WindowsGraphics(dc)
{
_disposeDc = true // we create it, we dispose it.
});
}
/// <summary>
/// Creates a WindowsGraphics from a memory DeviceContext object compatible with the a screen device.
/// This object is suitable for performing text measuring but not for drawing into it because it does
/// not have a backup bitmap.
/// </summary>
public static WindowsGraphics CreateMeasurementWindowsGraphics(IntPtr screenDC)
{
DeviceContext dc = DeviceContext.FromCompatibleDC(screenDC);
WindowsGraphics wg = new WindowsGraphics(dc)
{
_disposeDc = true // we create it, we dispose it.
};
return(wg);
}
/// <summary>
/// Creates a WindowsGraphics from a memory DeviceContext object compatible with the primary screen device.
/// This object is suitable for performing text measuring but not for drawing into it because it does
/// not have a backup bitmap.
/// </summary>
public static WindowsGraphics CreateMeasurementWindowsGraphics()
{
DeviceContext dc = DeviceContext.FromCompatibleDC(IntPtr.Zero);
var wg = new WindowsGraphics(dc)
{
_disposeDc = true // we create it, we dispose it.
};
// This instance is stored in a thread static so it will *always* get put on the finalizer queue.
// As we can't do anything in the finalizer, suppress finalization for this instance (otherwise
// our Dispose validation will assert and take down debug test runs).
wg.SuppressFinalize();
return(wg);
}
