IceColdSandwich/android_frameworks_base — comment on commit aef04f06c80d6183fe60d64f92158f2208685376
File:  line 0
By Rdlgrmpf:

I think this is the right way, looking at http://developer.android.com/reference/android/graphics/PixelFormat.html#TRANSLUCENT
Now you only need to figure out where to put it :D