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docs/xlib: Drop docs about long-dead X features.

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Nobody's doing 8-bit color-indexed rendering, and the overlay planes
referenced here are not anything that X drivers support these days, and
they were never ported to gallium.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39741>
This commit is contained in:
Emma Anholt 2026-02-05 18:02:00 -08:00
parent cbec12627b
commit cf445c1995
1 changed files with 0 additions and 26 deletions
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docs/xlibdriver.rst
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@ -64,32 +64,6 @@ blending will require a round-trip message for pixel readback.)
Experiment with the MESA_BACK_BUFFER variable to see which is faster for
your application.
Colormaps
---------
When using Mesa directly or with GLX, it's up to the application writer
to create a window with an appropriate colormap. The GLUT toolkit tries
to minimize colormap *flashing* by sharing colormaps when possible.
Specifically, if the visual and depth of the window matches that of the
root window, the root window's colormap will be shared by the Mesa
window. Otherwise, a new, private colormap will be allocated.
When sharing the root colormap, Mesa may be unable to allocate the
colors it needs, resulting in poor color quality. This can happen when a
large number of colorcells in the root colormap are already allocated.
Overlay Planes
--------------
Hardware overlay planes are supported by the Xlib driver. To determine
if your X server has overlay support you can test for the
SERVER_OVERLAY_VISUALS property:
.. code-block:: sh
xprop -root | grep SERVER_OVERLAY_VISUALS
Extensions
----------