Re: GC graphics_exposures

When a call is made to BeginPaint(HWND, PAINTSTRUCT), it fills in the struct
paintstruct. One of the variables in this paintstruct is RECT rcPaint. This
RECT contains the coordinates of the invalid (obscured) region of your
window. See the msdn information
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/gdi/pantdra
w_7b78.asp at that page. Not sure if this would help you out at all, but I
thought it might.

----- Original Message -----
From: "Peter Zelezny" <[email protected]>
To: <[email protected]>
Sent: Thursday, January 23, 2003 19:55
Subject: Re: [gimpwin-dev] GC graphics_exposures


> On Thu, 23 Jan 2003 22:12:12 +0000
> Tor Lillqvist <[email protected]> wrote:
>
> >  > I don't know how to emulate that in Win32, off-hand, but I will
> >  > investigate.
> >
> > I wonder if using ScrollWindowEx() with SW_INVALIDATE instead of
> > BitBlt() in blit_inside_window() would help? Will have to do some
> > testing... You wouldn't happen to have a minimal but complete test
> > program?
>
> I don't think that'll work, because ScrollWindowEx doesn't take into
> account obscured parts of the window. It only invalidates the parts
> that will scroll from off-screen and need to be redrawn.
>
> Is there a mainloop event that tells you a window is being obscured?
> It could be recorded and used later.
>
>
> --
> Peter Zelezny.
>
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--Lee


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