[SDL] Alpha blending bug - fixed?

[Ryan C. Gordon]

> The only thing I could find out was that ashift is 32-bit aligned but
> sf->Ashift isn't:

I don't think it's an alignment issue, since GCC should be smart enough 
to get it into a register even if unaligned...however, sf->AShift is 8 
bits, and ashift is 32, which is probably why you get different 
results...it probably landed in (say) %al instead of %eax, leaving junk 
in the rest of the register's bits.

Try the attached patch and see if it works, too.

--ryan.


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