dib fixes

[Alexandre Julliard]

Rein Klazes <wijn at wanadoo.nl> writes:

> I tried to do this, you need to clip to the visible region as well. I
> could not get it 100% full proof because of races between the clip
> calculations and the actual positions on the screen.
> 
> So I get the pixels now from the root window (clipped to the screen) and
> everything is rock solid. The code is simpler too.

That's ugly, and it will fail miserably if the drawable is a bitmap,
you really have to use the specified drawable. Look at how the BitBlt
code does it to determine the proper limits.

-- 
Alexandre Julliard
julliard at winehq.org