public Int32 FBtoInt32(double source)
{
//
// The Swf FB[nBit] Story:
//
// FBs are documented as 16.16Bit values with variable length.
// The actual implementation uses a signed 32Bit value first. That
// value (decoded, in Int32) is split at the 16 Bit boundary. The lower
// part is the fraction of 1.0, as seen from left to right, e.g. 0x8000
// would be 0.5, 0xC000 would be 0.25 and so on.
// See: http://de.wikipedia.org/wiki/Dualsystem (and don't use the English page)
//
// The following code uses a lot of local variables for debugging purposes.
// The code may get optimized if required.
//
double abs = Math.Floor(source);
double frac = source - abs;
double frac2 = frac * (double)0xFFFF;
double frac3 = Math.Round(frac2);
UInt16 frac4 = (UInt16)frac3;
Int16 major = (Int16)abs;
Int32 final = unchecked((major << 16) | frac4);
return final;
}
