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

[flya flya <flyaflyaa@xxxxxxxxx>]

I see, very very thanks!!!!!!!

On 8/7/05, Pete Shinners <pete@xxxxxxxxxxxx> wrote:
> 
> 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)
>     ...
> 
> 
>