Hi,
for a project I need to know how to program a transparent layer in C/C++.
I need this to create an OSD.
While e.g. a video is running on the desktop (not via X) within its own programm I would like to create an additional programm which will be displayed topmost above all other runing programms and displays certain OSD infomation.
So I want to see the OSD information and still want to see thru the OSD the video (better not a video, instead a videostream from a capture device) or any other application window running behind the topmost OSD layer.
I searched arround the internet how to manage this with the raspberry but couldn't find programming samples with transparent layers to manage this with help of OpenVG or other graphical APIs.
Any hints?
Best regards
Pat
Re: Trasparent layer for OSD
Hi Pat,
I haven't used OpenVG, but you could look at ajstarks code on github. The DispmanX interface would allow you to create an on-screen-display. I have some example DispmanX code on github. The worms example displays animated worms on top of the Raspberry Pi display. The below image is of the worms overlaying X11, but the same technique can be used to overlay anything on the Raspberry Pi display.
I haven't used OpenVG, but you could look at ajstarks code on github. The DispmanX interface would allow you to create an on-screen-display. I have some example DispmanX code on github. The worms example displays animated worms on top of the Raspberry Pi display. The below image is of the worms overlaying X11, but the same technique can be used to overlay anything on the Raspberry Pi display.
- worms.jpg (36.61 KiB) Viewed 2866 times