[Bug 745107] glimagesink: implement GstVideoOverlayCompositionMeta

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=745107

--- Comment #30 from Lubosz Sarnecki <lubosz at gmail.com> ---
@Tim:

I managed to pass the window size in the allocation query structure. One
challenging aspect is that it has to be passed through glcolorconvert, glupload
to textoverlay. It does not need to be passed through the textoverlays weirdly.
If I have multiple of them, they all receive the window size from glupload.

The major problem about this way of passing the window size is not only the
amount of additional code required (why complicated if it can be done simple),
but the bug that I receive 3 configure event old resolutions in the
textoverlay.

So it requires 3 resize / reconfigure events to get the current resolution
through all the elements, so the buffer is rendered with the resolution the
window hat 3 resize events before. Any solution to this would be appreciated.
Maybe reconfigure in the propose_allocation, but this does not sound right.

Enjoy:

https://git.collabora.com/cgit/user/lubosz/gst-plugins-bad.git/log/?h=videooverlaycomposition-alloc-query-size

https://git.collabora.com/cgit/user/lubosz/gst-plugins-base.git/log/?h=videooverlaycomposition-alloc-query-size

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