Robert Mader 76095b2cb0 mesa/formats: Add support for 10 and 12 bit SW decoder YCbCr formats
Matching e.g. I420_10LE in Gstreamer / yuv420p10 in ffmpeg. The formats
are notably used for HDR10 videos by software decoders like dav1d, libav,
libaom and libvpx.

Use-cases include video players and editors that can allocate DMA buffers
- e.g. via udmabuf, dma-heaps, VA-API, V4L2, etc. - allowing them to avoid
unnecessary copies. Testing HDR10 playback on CI might also become easier.

Signed-off-by: Robert Mader <robert.mader@collabora.com>
Reviewed-by: Eric R. Smith <eric.smith@collabora.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34303>
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`Mesa <https://mesa3d.org>`_ - The 3D Graphics Library
======================================================


Source
------

This repository lives at https://gitlab.freedesktop.org/mesa/mesa.
Other repositories are likely forks, and code found there is not supported.


Build & install
---------------

You can find more information in our documentation (`docs/install.rst
<https://docs.mesa3d.org/install.html>`_), but the recommended way is to use
Meson (`docs/meson.rst <https://docs.mesa3d.org/meson.html>`_):

.. code-block:: sh

  $ meson setup build
  $ ninja -C build/
  $ sudo ninja -C build/ install

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Bug reports
-----------

If you think something isn't working properly, please file a bug report
(`docs/bugs.rst <https://docs.mesa3d.org/bugs.html>`_).


Contributing
------------

Contributions are welcome, and step-by-step instructions can be found in our
documentation (`docs/submittingpatches.rst
<https://docs.mesa3d.org/submittingpatches.html>`_).

Note that Mesa uses gitlab for patches submission, review and discussions.
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