sw_engine: revise outline transform

sw_engine: revise outline transform

sw_engine simulates floating point by integer bit shifting,
it loses the accuracy while converting the number data.

This occurs the inacculated curve points result if it scales up very large size.

So we transform points before converting data in order to avoid losing the numbers less decimal point.

Change-Id: I0172e83f06b1a19143a2f65f667dc193e9a4396a