Re: [pygame] how to optimize these two function?

[Pete Shinners <pete@xxxxxxxxxxxx>]

For your copy_blit, this is already built into SDL and pygame. It takes
a bit of magic mask settings for it to apply. But I'm pretty sure if
both source and destination Surfaces have per-pixel alphas, you can do a
copy blit by turning off the alpha flag on the source.

    oldalpha = source.get_alpha()
    source.set_alpha(None)
    dest.blit(source, (0,0))
    source.set_alpha(oldalpha)


It's been awhile since I've looked into Numeric. You'll need the docs on
hand, but this should be close to what actually works.

def change_alpha(surf, alpha):
    ...
    alphas = pygame.surfarray.pixels_alpha(surf)
    alphas[:] = Numeric.where(alphas, alpha, 0)
    ...