[Bug 792874] New: waylandsink: gst-launch-1.0 windows does not mimic application well

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=792874

            Bug ID: 792874
           Summary: waylandsink: gst-launch-1.0 windows does not mimic
                    application well
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: minor
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: nicolas at ndufresne.ca
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Title is a little vagues, but how waylandsink works is that the application
passes a Surface, and waylandsink attach two subsurfaces to it (back plane for
the black borders, and the video layer).

Though, when testing with gst-launch-1.0, the created "window" do have a
surface, but that surface does not have a buffer attached to it. That makes
gnome-shell think the "window" has a size of 0x0, while weston will assume the
size of the sub-surfaces.

This is more visible if you set a render rectangle on that created windows,
since this endup having absolutely no effect. I "think" that to better mimic
applications we should attach a background buffer to this window, at the size
we want this window to be. And update that surface when the window is being
resized. We could make this background blue or something, that will ease
testing the VideoOverlay render rectangle implementation, which seems to have
some problems atm.

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