[Bug 700413] New: [ximagesink] add alpha mask support

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=700413
  GStreamer | gst-plugins-base | 1.x

           Summary: [ximagesink] add alpha mask support
    Classification: Platform
           Product: GStreamer
           Version: 1.x
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: benjamin.gaignard at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=244357)
 View: https://bugzilla.gnome.org/attachment.cgi?id=244357
 Review: https://bugzilla.gnome.org/review?bug=700413&attachment=244357

add alpha mask support

When X screen return a depth = 32 with bpp = 24, the alpha mask be
correctly set to have a known GST video format.
X visual structure doesn't provide the aplha mask information but we can
find it from the others masks.
alpha_mask must also take care of little/big endian bit swap.

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