Re: [ros-dev] [ros-diffs] [weiden] 29670: Tweak the ScrollDC implementation

jimtabor wrote:

>  I noticed WndProc messages originate from win32k too.
> The window  
thread is
>  locked and then the message is sent out.
>
> Example: Function call User32 -> Win32k -> send message.
>
> Maybe we are doing double the work when we scroll on a bar. The rapid
> blinking of the bar too. We maybe sending more than one message out. 
Trying a hypothesis here, could it work if all such w32k-registered-
and-managed window classes, if not subclassed by the app, lock visual 
updates while calling back into usermode (cmp. LockWindowUpdate(hWnd) 
)?

(recursive calls, whether intentional or from buggy user-mode app code 
could invalidate it)

>  4. Fix bugs.
> 5. Get paid! 
If you solve that... :-)

-- 
Mike

[James Tabor]

Hi!
tamlin(a)algonet.se wrote:
>   
>  Trying a hypothesis here, could it work if all such w32k-registered-
>  and-managed window classes, if not subclassed by the app, lock visual 
>  updates while calling back into usermode (cmp. LockWindowUpdate(hWnd) 
>  )?
>  
>  (recursive calls, whether intentional or from buggy user-mode app code 
>  could invalidate it)
>   
Hum?~ I need to research this more.

> >   4. Fix bugs.
> >  5. Get paid! 
>  
>  If you solve that... :-)
>   
LOL! Yeah~
James

[James Tabor]

Hi Mike!
James Tabor wrote:
>   Hi!
>  tamlin(a)algonet.se wrote:
> >   Trying a hypothesis here, could it work if all
> > such w32k-registered-
> >  and-managed window classes, if not subclassed by the app, lock visual 
> >  updates while calling back into usermode (cmp. LockWindowUpdate(hWnd) 
> >  )?
> >
> >  (recursive calls, whether intentional or from buggy user-mode app code 
> >  could invalidate it)
> >  
>  Hum?~ I need to research this more.
>  
> > >   4. Fix
> > > bugs.
> > >  5. Get paid! 
> >  If you solve that... :-)
> >  
>  LOL! Yeah~
>  James 
Okay,,, I was making a /. joke. Every list ends that way. Should end?

Now, There was a WM being called from both Kernel and User, ping ponging in
and out. I can not remember which one it was.. With out any control point.
I looked into Wine and they assume the application handles it, but that is
not true. This is just one example.

LockWindowUpdate is a good idea. I'm still looking into it....

Thanks again,
James