[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:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #272580|none                        |reviewed
             status|                            |

--- Comment #2 from Nicolas Dufresne <nicolas.dufresne at collabora.co.uk> 2014-03-21 21:20:27 UTC ---
Review of attachment 272580:
 --> (https://bugzilla.gnome.org/review?bug=726833&attachment=272580)

::: sys/ximage/gstximagesrc.c
@@ +1076,3 @@
+  alpha_mask = ~(xcontext->r_mask_output
+      | xcontext->g_mask_output | xcontext->b_mask_output);
+  alpha_mask &= 0xffffffff;

This line looks like a no-op to me, if so we should fix in ximagesink too.

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