Re: Fwd: [gsl-dev] replace the .bmp splashscreen

[Philipp Lohmann]

eric.bachard wrote:
> Hi Malte,
>
> Malte Timmermann a écrit :
>> I would have thought you simply need to set the background from the 
underlying system window to transparent before showing it, and
>> everything should work automatically then?
>
> Thanks for the hint :-)
>
> In fact, after some researchs in introwin.hxx, oudev.hxx, window.h 
window.hxx and all *win parents , I found nothing who works directly 
(this is probably my fault though).
>
> The only closest solution I found does consist in use 
EnableEraseBackground( aBool ), but so far, this method is implemented 
in salobj.cxx or syschild.cxx , so a (hackish imho) solution would 
consist in - if I'm not too wrong - call GetSystemData() and set the 
right value using  mpWindowImpl-mpSysObj->IsEraseBackgroundEnabled() to 
the right value in the Ctor, and reinitialize it in the Dtor. Or 
something similar with syschildwindow ..  (please be gentle if I'm plain 
wrong with such idea ;-)   )

The intro bitmap does not involve any SalObject; mpSysObj will always be 
NULL here.

>  From my side, I'd finaly prefer the clipping solution suggested by 
Thorsten, and that I mentioned in a previous mail

That is the right thing to do IMHO; it will work out of the box on all 
platforms. For performance reasons it might be advisable to set a mask 
instead of a region, but we'd need additional code to do that.

Just my 2 cents, pl



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