[Bug 782917] New: qmlglsink: Add dummy black texture as placeholder for NULL buffers

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=782917

            Bug ID: 782917
           Summary: qmlglsink: Add dummy black texture as placeholder for
                    NULL buffers
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: dv at pseudoterminal.org
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Currently, the GstQSGTexture bind() function doesn't really do anything if a
null GstBuffer pointer is supplied. This results in some random pixels being
shown, because an invalid texture is used in the QSGNode. Fix this by binding
an internal dummy black 64x64 RGBA texture if the GstBuffer pointer is NULL.

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