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

[Fred Kiefer]

Jeff Teunissen wrote:
> Fred Kiefer wrote:
>
>
> > This is a well know limitation of the windows backend and all attempts
> > to fix this with GDI functions have failed so far. My opinion is that we
> > will need to switch to GDI++, for which C-wrappers exist, to resolve
> > this. But there are currently no free header files for GDI++ available
> > and I wont be using the ones from MS.
>
>
> 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.

Fred