[Bug 701095] New: videomixer: Should implement pass-through and optimizations

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=701095
  GStreamer | gst-plugins-good | 1.x

           Summary: videomixer: Should implement pass-through and
                    optimizations
    Classification: Platform
           Product: GStreamer
           Version: 1.x
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: nicolas.dufresne at collabora.co.uk
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Currently videomixer could operate faster in certain conditions.

1) Passthrough If there is only 1 input, it could pass-through if the input has
no alpha and is fullscreen
2) Passthrough If there is multiple inputs, but the top layer is fullscreen and
has no alpha
3) Only fill/copy visible rectangle of each layer when a opaque color format is
negotiated

This would allow having a videomixer around with very low cost.

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