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Re: [pygame] Surface.blit() BLEND_ADD vs. BLEND_RGBA_ADD

To: pygame-users@xxxxxxxx
Subject: Re: [pygame] Surface.blit() BLEND_ADD vs. BLEND_RGBA_ADD
From: Florian Berger <fberger@xxxxxxxxxxxxxxxxx>
Date: Fri, 23 Dec 2011 10:38:26 +0100
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Hi!

René Dudfield <renesd@xxxxxxxxx>:
>
> Maybe the RGBA_PREMULT of pygame.image.tostring could be used...

It works. Thanks, man! A visual example of the problem and your solution
is at http://pastebin.com/0JJQVYe8 .

Just curious, how bad is the performance penalty for this double
conversion step?

Would it be better to have a BLEND_ADD_PREMULT blit mode instead, i.e.
put the premultiplication in the blitting code?

Kind regards,

        Florian

Follow-Ups:
- Re: [pygame] Surface.blit() BLEND_ADD vs. BLEND_RGBA_ADD
  - From: Greg Ewing

References:
- [pygame] Surface.blit() BLEND_ADD vs. BLEND_RGBA_ADD
  - From: Florian Berger
- Re: [pygame] Surface.blit() BLEND_ADD vs. BLEND_RGBA_ADD
  - From: Ian Mallett
- Re: [pygame] Surface.blit() BLEND_ADD vs. BLEND_RGBA_ADD
  - From: Florian Berger
- Re: [pygame] Surface.blit() BLEND_ADD vs. BLEND_RGBA_ADD
  - From: René Dudfield
- Re: [pygame] Surface.blit() BLEND_ADD vs. BLEND_RGBA_ADD
  - From: Florian Berger
- Re: [pygame] Surface.blit() BLEND_ADD vs. BLEND_RGBA_ADD
  - From: Greg Ewing
- Re: [pygame] Surface.blit() BLEND_ADD vs. BLEND_RGBA_ADD
  - From: Florian Berger
- Re: [pygame] Surface.blit() BLEND_ADD vs. BLEND_RGBA_ADD
  - From: René Dudfield

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