My HTML/JS AIR app uses alpha-blended PNGs to apply a pretty window decoration on the desktop. On Mac and Windows, it looks great and works exactly how I would like. On Linux though (Ubuntu on VirtualBox) the transparency does not work, and I've got a big black border where the alpha blending should be.
Is this expected on Linux, and I should wrap a normal window around instead, or should I expect to see alpha blended windows behave and look the same as on Mac/Windows?
To be able to view transparent windows you need to enable desktop effects (this is not a limitation of AIR but of display managers). Unfortunately desktop effects cannot be enabled on virtual machines, you can only do that on a physical machine.
Thanks a lot Sundeep, I'll maybe dual-boot my machine and give it a try.