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
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