public static System.Drawing.Size GetImageSize(System.Drawing.Size currentSize, System.Drawing.Size maxSize, bool scaleUp)
{
	System.Drawing.Size newSize = currentSize;
	double ratioX = Convert.ToDouble(maxSize.Width) / Convert.ToDouble(currentSize.Width);
	double ratioY = Convert.ToDouble(maxSize.Height) / Convert.ToDouble(currentSize.Height);
	double ratio = System.Math.Min(ratioX, ratioY);

	if (ratio < 1.0 || scaleUp)
	{
		newSize.Width = DoubleToIntDef(Math.Floor(Convert.ToDouble(currentSize.Width) * ratio), 0);
		newSize.Height = DoubleToIntDef(Math.Floor(Convert.ToDouble(currentSize.Height) * ratio), 0);
	}
	return newSize;
}

public static System.Drawing.Size GetMinImageSizeToFit(System.Drawing.Size currentSize, System.Drawing.Size targetSize)
{
	System.Drawing.Size newSize = currentSize;
	double ratioX = Convert.ToDouble(targetSize.Width) / Convert.ToDouble(currentSize.Width);
	double ratioY = Convert.ToDouble(targetSize.Height) / Convert.ToDouble(currentSize.Height);
	double ratio = System.Math.Max(ratioX, ratioY);

	newSize.Width = DoubleToIntDef(Math.Floor(Convert.ToDouble(currentSize.Width) * ratio), 0);
	newSize.Height = DoubleToIntDef(Math.Floor(Convert.ToDouble(currentSize.Height) * ratio), 0);
	return newSize;
}

private static int DoubleToIntDef(double d, int def)
{
	try
	{
		return Convert.ToInt32(d);
	}
	catch (Exception)
	{
		return def;
	}
}