[Scummvm-devel] blendPixelPtr()

[Willem Jan Palenstijn]

On Fri, Jan 10, 2014 at 03:02:52PM +0000, D G Turner wrote:
> Marcus,
>   I have no POV about whether this is correct or not, but the
>   discussion on #scummvm around the commit date provides some
>   context of the associated commits to IOS backend code and AA rect in
>   the GUI:
>   http://logs.scummvm.org/log.php?log=scummvm.log.20Feb2012&format=html

Specifically, the commit you mentioned was intended to fix this bug:
http://i.imgur.com/AUxjJ.jpg 

Not many backends use an overlay format with alpha, and even some that do copy
the full game screen to the overlay so that it is not transparent. For a
transparent overlay, we should see about fixing that black-corners blending bug
some other way than the somewhat heavy-handed 264ba4a9.

-Willem Jan



> On 10/01/14 14:14, Marcus Comstedt wrote:
> > 
> > Willem Jan Palenstijn <wjp at usecode.org> writes:
> > 
> >> This should never happen. The screen should always be initialized to A=1.0.
> >>
> >> Is this not the case for you?
> > 
> > We're not talking about the "screen" as in the game area, this is the
> > overlay.  The overlay should be (and is) initialized to A=0.0, so that
> > you can see the game area behind it.  If it were initialized to A=1.0,
> > then the GUI would appear on top of black, rather on top of the game
> > graphics.
> > 
> > 
> >   // Marcus
> 
> 
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