color provides a screen mixin for color handling:
Color handles color allocation. It maintains a cache of
allocated colors to reduce PLWM's colormap footprint on displays
with a low bit depth.
Returns the pixel value corresponding to color. color can
be a string or tuple of (R, G, B) integers. If the color can't be
allocated and default is provided,
get_color tries to
return that color instead. If that fails too, it raises a
Return the pixel value for the color defined in the X resource
WindowManager.rdb_get is used to lookup the resource, so the
first components of the name and class should be omitted and they should
start with `.'.
default is provided, that name will be used if no matching X
resource is found. If omitted, or if the color can't be allocated,
ColorError is raised.
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