protected internal override void ChangeRenderTarget(RenderTarget newRenderTarget)
{
if (RenderTargetSupportsGDI(newRenderTarget))
{
gdiRenderTarget = newRenderTarget.GetGdiInteropRenderTarget();
}
else if (gdiRenderTarget != null)
{
gdiRenderTarget.Dispose();
gdiRenderTarget = null;
}
}