protected void InternalUpdateScreen(int ix, int iy)
{
Rectangle r = canvas.Clip(UpdateRectangle.Grow(ix, iy));
if (canvas.OnScreen(r))
{
canvas.CopyToScreen(r);
}
}
public virtual void GetBackground()
{
background?.Dispose();
background = null;
backgroundRectangle = canvas.Clip(UpdateRectangle);
if (canvas.OnScreen(backgroundRectangle))
{
background = canvas.GetImage(backgroundRectangle);
}
}