[Bug 746147] New: compositor: Don't convert or aggregate pads that are completely obscured by a higher zorder pad

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=746147

            Bug ID: 746147
           Summary: compositor: Don't convert or aggregate pads that are
                    completely obscured by a higher zorder pad
    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: nirbheek.chauhan at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Very straightforward idea; for each pad, check every higher zorder pad to see
if any of them completely obscure this pad, and if they do, set the
converted_frame as NULL to skip it. This is particularly useful in the case
when you have a "background image" or video on top of which other videos are
overlayed, and when you "fullscreen" one of those videos, the background one
should just be skipped by the pad. 

Skipping conversion is the major benefit, but avoiding memcpy is also good.

The overall check is O(n^2), but it takes a negligible amount of time to
compute unless you have hundreds of pads (in which case there are other,
larger, bottlenecks).

Patches to implement this and a test are attached.

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