How to set Qt window transparent?

[wysota]

Forget about transculency on embedded linux. Your X server there probably doesn't support compositing anyway. I'm going to repeat myself one more time - implement your application as a plugin to the webbrowser and switch the browser to WebKit or make everything (including the browser itself) a single application.

[montylee]

Forget about transculency on embedded linux. Your X server there probably doesn't support compositing anyway. I'm going to repeat myself one more time - implement your application as a plugin to the webbrowser and switch the browser to WebKit or make everything (including the browser itself) a single application.

so it is not possible to get translucency on embedded linux anyway? A normal X11R7 server is running on the embedded hardware.

About the webkit thing, you are correct but i can't force the company to change it. I am temporary guy working for that company and i have been given a module which i am working on, so i really can't force them to do this as the project schedule is tight and they are using the browser for other applications as well.

[wysota]

so it is not possible to get translucency on embedded linux anyway? A normal X11R7 server is running on the embedded hardware.

Even if you manage to enable compositions in the server, they will probably be done in software which will be hell slow.

About the webkit thing, you are correct but i can't force the company to change it. I am temporary guy working for that company and i have been given a module which i am working on, so i really can't force them to do this as the project schedule is tight and they are using the browser for other applications as well.

If you tell them it is not possible to obtain the effect they want, maybe this will give them something to think about. Currently I suggest you stick with rendering the browser's window to a pixmap and use that as a background of your widget. It is unlikely you are going to get anything better.

[montylee]

Hmmm thanks for the suggestions!
I'll try to enable transparency today in the embedded hardware and if it doesn't work i'll use pixmap as the widget background.

But i still don't know which file does compiz modify to enable X11 composite extensions.

[wysota]

/etc/X11/xorg.conf should contain an entry such as the following:

Section "Extensions"
    Option "Composite" "Enable"
EndSection

Section "Extensions"
    Option "Composite" "Enable"
EndSection

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Also check glxinfo|grep rendering to see if it has direct rendering available.

[montylee]

i tried running the code on the embedded hardware but couldn't see any translucency. I'll see if it has direct rendering.

[wysota]

It is possible you need to turn on a compositing manager. Check out xcompmgr.