[Bug 700413] [ximagesink] add alpha mask support

[GStreamer (bugzilla.gnome.org)]

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

--- Comment #1 from Tim-Philipp Müller <t.i.m at zen.co.uk> 2013-05-15 21:59:19 UTC ---
Is it really the case that depth=32,bpp=24 means there's an alpha channel? How
do we differentiate an alpha channel being present from an unused padding byte
for alignment purposes?

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