[Bug 778078] New: waylandsink: set video surface opaque

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=778078

            Bug ID: 778078
           Summary: waylandsink: set video surface opaque
    Classification: Platform
           Product: GStreamer
           Version: 1.10.x
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: fabien.dessenne at st.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 344775
  --> https://bugzilla.gnome.org/attachment.cgi?id=344775&action=edit
waylandsink: set video surface opaque

By default, the weston compositor does not consider the video surface as
opaque, even if its format has no alpha component (like eg NV12).
Hence, when composing the surfaces, weston considers the hidden black area
surface (that embeds the video surface) as a surface to be composed, which is
useless.

In order to help the compositor, declare the video surface as opaque (unless it
has alpha component).

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