Adam Jackson ed2e3f5871 wsi/x11: Fix the is-visual-supported check
This was sort of well intentioned, but wrong. bits_per_rgb_value is the
number of significant bits in the color (channel) specification, not the
number of bits used to name that color within the pixel. If you have a
depth 24 visual but the colormap is 11 bits deep then each of those
channels selects one of 256 11-bit color values in the output ramp.

The open source drivers mostly don't expose anything like that, but
nvidia does, and we refuse to work. That's silly. Practically speaking
we can probably render to any TrueColor or DirectColor visual that your
X server exposes, since it is probably not going to have visuals for
non-color-renderable formats. Just check the visual class instead.

Likewise when matching formats to visuals, count the bits in the rgb
masks in the visual.

Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/6995
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18381>
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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://mesa3d.org/install.html>`_), but the recommended way is to use
Meson (`docs/meson.rst <https://mesa3d.org/meson.html>`_):

.. code-block:: sh

  $ mkdir build
  $ cd build
  $ meson ..
  $ sudo ninja install


Support
-------

Many Mesa devs hang on IRC; if you're not sure which channel is
appropriate, you should ask your question on `OFTC's #dri-devel
<irc://irc.oftc.net/dri-devel>`_, someone will redirect you if
necessary.
Remember that not everyone is in the same timezone as you, so it might
take a while before someone qualified sees your question.
To figure out who you're talking to, or which nick to ping for your
question, check out `Who's Who on IRC
<https://dri.freedesktop.org/wiki/WhosWho/>`_.

The next best option is to ask your question in an email to the
mailing lists: `mesa-dev\@lists.freedesktop.org
<https://lists.freedesktop.org/mailman/listinfo/mesa-dev>`_


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

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


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

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

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