Implement source alpha plus SourceConstantAlpha combined transparency.

[Andrew Eikum]

Jaime Rave wrote:
> Anything wrong with this patch?? It helps a lot in MSN Messenger and some
> other programs.
> 
> http://www.winehq.org/pipermail/wine-patches/2009-October/080539.html
> 
> Jaime Rave Torrres

It looks like your patch does two separate things.  You should always 
break your patches up to solve one specific problem each.  Among other 
things, this makes regression testing easier.

I'm not familiar with the code you're modifying, but if it's possible to 
test the behavior you're correcting via the Windows API, please write 
tests to do so.  Since you're modifying winex11.drv, you'll want to look 
into other areas of Wine that are affected by this change.  Perhaps some 
image loading function in another module can be used to verify the behavior.

This is less important, but you're not following the code conventions of 
the surrounding code.  The surrounding code does not have spaces around 
function parameters, so yours shouldn't either.

Good luck,
Andrew