Copy paste from : http://www.faqs.org/faqs/x-faq/part7/ Subject: 175) How do I create a transparent window?
A completely transparent window is easy to get -- use an InputOnly window. In order to create a window which is *mostly* transparent, you have several choices:
- the SHAPE extension first released with X11R4 offers an easy way to make non-rectangular windows, so you can set the shape of the window to fit the areas where the window should be nontransparent; however, not all servers support the extension.
- a machine-specific method of implementing transparent windows for particular servers is to use an overlay plane supported by the hardware. Note that there is no X notion of a "transparent color index".
- a generally portable solution is to use a large number of tiny windows, but this makes operating on the application as a unit difficult.
- a final answer is to consider whether you really need a transparent window or if you would be satisfied with being able to overlay your application window with information; if so, you can draw into separate bitplanes in colors that will appear properly.
[thanks to der Mouse, , 3/92; see also
The X Journal 1:4 for a more complete answer, including code samples for this last option]
Graeme Geldenhuys wrote 24 lines
Hi,
Anybody know how to use Xlib API to create transparent windows? This
is for use with fpGUI Toolkit. For example. I have a Label component
(which is actually a mini window) and have to always specify and paint
a background color. If I don't, I see all kinds of rubbish as the
background.
I want to place the Label component/window on another window (Form),
and only want to see the text of the label. The background window must
show through. Any ideas?
Regards,
- Graeme -
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