Hi,
I wanted to ask if there are already any ideas concerning the way vos
can support OSD drawing, e.g. if there is hardware support for drawing
pictures with alpha (like in OpenGL..)
I personally have been thinking about a few things (something like a
"very first draft"):
1) The vos should be able to give a "virtual" resolution for the OSD, so
they can vary it independently from video size (very usefull if the OSD
will be displayed on a different display, or there is some kind of
overlay mechanism that supports only a different resolution than for the
video).
2) Not giving x, y coordinates for different parts of the OSD, but
instead specifying
left, horizontal center or right and
top, vertical center or bottom
This would allow the driver to e.g. always put the subtitles in the
black border below the picture when it's big enough...
The vo would maintain a buffer for each of these locations (3*3=9
altogether), and the interface functions would allow to set the size and
contents of these buffers or mark them as unused.
Greetings,
Reimar Döffinger
