[Bug 726833] ximagesrc: Add alpha channel support

[GStreamer (bugzilla.gnome.org)]

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

Nicolas Dufresne <nicolas.dufresne> changed:

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--- Comment #8 from Nicolas Dufresne <nicolas.dufresne at collabora.co.uk> 2014-03-27 20:36:02 UTC ---
Review of attachment 273109:
 --> (https://bugzilla.gnome.org/review?bug=726833&attachment=273109)

Tested and works on X11 with BGRA visual.

commit 39fc394254c94461de26be770fc9ac7370f903b0
Author: Tim-Philipp Müller <tim at centricular.com>
Date:   Thu Mar 27 19:51:50 2014 +0000

    ximagesrc: only extrapolate alpha mask for 32-bit depth

    Instead of passing bogus alpha mask values when there's no alpha.

    https://bugzilla.gnome.org/show_bug.cgi?id=726833

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