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

[tamlin at algonet.se]

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