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Re: [bugs #10818] win32 backend doesn't properly display transparency...

From: Jeff Teunissen
Subject: Re: [bugs #10818] win32 backend doesn't properly display transparency...
Date: Wed, 17 Nov 2004 09:23:44 -0500

Fred Kiefer wrote:

> > Keep in mind that GDI's colors are backwards -- BGR, not RGB -- and
> > when you use transparency, they're BGRA. You need to swap red and
> > blue.
> Could you please explain how this affects the current code (with or
> without AlphaBlend) in the win backend? I thought that the colour order
> needs to be specificed when an image is created from a bitmap and after
> this step it is up to windows to sort the colours. You seem to suggest
> something different, which I still don't understand.
> Perhaps basing your remark on the code in WIN32GState would help me to
> get your point.

Last time you did it (transparency), you said that transparency worked, but
that the red and blue channels were messed-up/swapped. I just gave you a
reason that may be the case.

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