On 2/27/06, Christian Iversen <[EMAIL PROTECTED]> wrote:
> On Monday 27 February 2006 09:38, Micha Nelissen wrote:
> > Felipe Monteiro de Carvalho wrote:
> > > What really happens with TransparentColor of TForm is that it takes a
> > > screenshot of the screen, probably before the application is loaded,
> > > so it doesn't appear on the screenshot, and the first thing that
> > > happens on the paint process of the window is paint a portion of the
> > > screenshot.
> > >
> > > There is no real window transparency on Windows API. All apps that
> > > don't seam to have a rectangular window acctually work like that.
> >
> > I think SetWindowRgn makes part of a window transparent (the parts not
> > in the region). For example, winamp can do it: have oddly shaped sizes.
>
> And, xmms can do it without problems as well. (also on old versions of X)
>
> It's only the alpha-*blended* situation that is tricky - alpha testing should
> not be too hard, if you simply recompute the clipping region when the bitmap
> is changed (which is probably slow, so just don't change it too often :-)
>
> --
> Regards,
> Christian Iversen
No, no, no, Micha is very right.
I don't know how this discussion started and what it was trying to
acomplish, but SetWindowRgn does exatcly what Micha said.
-Flávio
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