public void WritePicAbsCoord(ref PointShort p)
{
/* var prefix = stream.ReadB();
* p.X = (ushort)(stream.ReadB() + ((prefix & 0xf0) << 4));
* p.Y = (ushort)(stream.ReadB() + ((prefix & 0x0f) << 8)); */
byte prefix = (byte)((((p.X >> 8) & 0xf) << 4) | ((p.Y >> 8) & 0xf));
AddByte(prefix);
AddByte((byte)(p.X & 0xff));
AddByte((byte)(p.Y & 0xff));
}
public static PointShort ReadPicRelCoord(this Stream stream, PointShort orig)
{
var i = stream.ReadB();
if ((i & 0x80) == 0x80)
{
orig.X = (ushort)(orig.X - ((i >> 4) & 0xf));
}
else
{
orig.X = (ushort)(orig.X + ((i >> 4) & 0xf));
}
if ((i & 0x08) == 0x08)
{
orig.Y = (ushort)(orig.Y - (i & 7));
}
else
{
orig.Y = (ushort)(orig.Y + (i & 7));
}
return(orig);
}