[pygame] changing alpha pixels.

[Rene Dudfield <illumen@yahoo.com>]

Hi,

I'm writting a function to change the alpha pixels of
a surface by adjusting the alpha pixel values by a
percentage.  The percentage can be 25%, 50%, and 75%.

eg, set all the alpha pixels to 25% of what they were.

I don't have the code here(no internet connection at
home for another four days!).  

I'm using Numeric.right_shift to set the values to
25%, and 50%, but I'm not sure how to do 75% in one
pass.  I could add 25%, and 50% together, but that
seems wasteful.

Any ideas on how to do 75% quickly?


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