[Bug 794401] glvideomixer: possible rotation bug

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=794401

Matthew Waters (ystreet00) <ystreet00 at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |ystreet00 at gmail.com

--- Comment #1 from Matthew Waters (ystreet00) <ystreet00 at gmail.com> ---
Ah, the problem is the rotation in the transformation (rotation, etc) combined
with the translation from the pad properties (xpos, ypos) will rotate around a
different point than expected.

Moving the xpos/ypos vertex modification into a transformation matrix itself
and then multiplying with the upstream matrix should fix this issue.

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