[Bug 639237] textoverlay: patch to use "A OVER B" alpha compositing

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=639237
  GStreamer | gst-plugins-base | git

Sebastian Dröge <slomo> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|HEAD                        |0.10.33

--- Comment #4 from Sebastian Dröge <slomo at circular-chaos.org> 2011-04-01 08:40:29 UTC ---
commit 200ee96338e73932074ad977d2187a7b7c163d96
Author: Lane Brooks <dirjud at gmail.com>
Date:   Mon Jan 17 21:12:18 2011 -0700

    textoverlay: Added support for ARGB and other RGB alpha variants

commit e2150b11ff8a98a3b7081d8106bca496a91c6b2b
Author: Lane Brooks <dirjud at gmail.com>
Date:   Tue Jan 11 10:34:33 2011 -0700

    textoverlay: converted AYUV to use 'A OVER B' alpha compositing

    'A OVER B' compositing is explained at
    http://en.wikipedia.org/wiki/Alpha_compositing.

    Previously, overlaying text on a transparent background image left the
    text overlay also transparent. This pipeline shows such an example:

    gst-launch videotestsrc pattern=white !
video/x-raw-yuv,format=\(fourcc\)AYU

    With this patch, text is composited "OVER" the background image and
    thus is visible regardless of the alpha of the background image. The
    overlay in the above pipeline works after applying this patch.

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