Hello Chris, On 23.09.2013 15:19, Chris Wilson wrote: > On Mon, Sep 23, 2013 at 01:23:08PM +0200, Jochen Keil wrote: >> Hello, >> >> I'm trying to write an application with which I'd like to draw "over" >> other windows. So far my attempts have been: > >> * Drawing to an transparent overlay window I create myself: Main problem >> is to keep this window always on top of of all the other windows >> (repeated calls to XRaiseWindow, possible flicker) + requires a >> compositing manager. > > I took this approach (using the hw overlay plane), plus a > XV_ALWAYS_ON_TOP attribute. (Eliminates the raise requirement, and > allows the user to write to the scanout without waking the GPU.) Using > the overlay also ensures that it appears over all windows, including the > compositing manager or fullscreen games (without interferring with those).
thanks for your reply. I looked for documentation for XV_ALWAYS_ON_TOP, but couldn't find any. Is there documentation available somewhere? However, I figured, that what I'd like my application to do resembles more a compositing manager. In particular I wanted my windows to become transparent only on overlapping parts. For example I have an focused window which is partially occluded by an unfocused window. The unfocused window would then be drawn transparently over the focused window. Thus I think it'd be more appropriate to write a plug-in for an existing compositing manager. Best wishes, Jochen > -Chris >
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