Alle 16:24, luned� 28 luglio 2003, hai scritto:
> Quoting Denis Oliver Kropp ([EMAIL PROTECTED]):
> > > First, it could be nice if an app could find a window at (x,y), or
> > > could use some window-manager like policies about size, etc ...
> > > Some time ago someone was speaking about a window manager, isn't it?
> >
> > You may want to read the todo section on the web site.
>
> Adding an IDirectFBDisplayLayer::GetWindowAt(x,y) could be easily added.
> It would return the ID of the window. Or would you prefer to create and
> return an interface to it already?
>
> This will require some thoughts about security soon.
What do you mean by thoughts about security, since every app already
can access rw to shared memory?
>
> > > Third, it could be nice that a window with alpha channel could decide
> > > of not receiving mouse event where alpha = 0, with this shaped window
> > > can be implemented in Qt and receive selected events. Al that can be
> > > realized with the attached patch, that add the "DWOP_SHAPED" flag (to
> > > be used with DWOP_ALPHACHANNEL)
> >
> > I was thinking of that some time ago. Unfortunately the locking to read
> > one pixel for each mouse movement may be too much overhead and a faster
> > solution should be thought about.
> >
> > I will apply the patch now. However, DWOP_SHAPED has to be implemented
> > for color keyed windows, too. You should think about using the primary
> > pixelformat (pixel format of the layer, i.e. no DWCAPS_ALPHACHANNEL). You
> > can implement shaped windows via color keying then which is way faster
> > and consumes less video memory. XDirectFB uses color keying for shaped
> > windows.
>
> Your patch is in CVS now. I made some fixes and improved readability ;)
> I also added a pre-check if the window surface's pixel format has alpha
> at all. If not (common case) we can skip the locking.
>
it was already there that check, isn't it?
if( window->options & (ALPHA|SHAPED)!=(ALPHA|SHAPED) || ...)
return w;
as DWOP_ALPHA... is not allowed if surface has no alpha?
Monge Maurizio
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