/// <summary>
/// Multiply a DCTELEM variable by an int constant, and immediately
/// descale to yield a DCTELEM result.
/// </summary>
private static int FAST_INTEGER_MULTIPLY(int var, int c)
{
#if !USE_ACCURATE_ROUNDING
return(JpegUtils.RIGHT_SHIFT((var) * (c), FAST_INTEGER_CONST_BITS));
#else
return(JpegUtils.DESCALE((var) * (c), FAST_INTEGER_CONST_BITS));
#endif
}