[Bug 726833] New: ximagesrc: Add alpha channel support

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=726833
  GStreamer | gst-plugins-good | git

           Summary: ximagesrc: Add alpha channel support
    Classification: Platform
           Product: GStreamer
           Version: git
        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: ---


Some new DDX expose visual with a depth of 32 bit, which imply you need to pass
a alpha mask when calling gst_video_format_from_masks() otherwise you'll endup
with "UNKNOWN" as a format. The following patch enables alpha support in
ximagesrc by extrapolating the alpha_mask. This code has been taken from
ximagesink, which is not in the same repository for reason I don't know.

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