pointer aliasing in ImfFloatToHalf

[k3f42]

there are 2 bad aliasing in the ImfFloatToHalf (float f, ImfHalf *h) function, making compilers and analyzers cry as it does not follow the aliasing rules... easily fixed with a memcpy:

short half = FloatToHalf( (int)&f );
is replaced by
int x;
memcpy((void *)&x,(const void *)&f,sizeof(float));
short half = FloatToHalf(x);
(same for ImfHalf cast).

Assembly generated is exactly the same (on my machine) but compiler is happy and code is now safe if aggressive optimization is turn on.

Cheers,