Why XWin expose multiple visuals with same depth/colormap ?

[patrick ficheux]

Hello,

It seems that XWin exposes a lot of Visuals with same caracteristics 
(depth / colormap).

xdpyinfo displays 33 visuals of 2 type :
    TrueColor / 24 bits
    DirectColor / 24 bits

Is there a reason to expose 15 identical TrueColor visuals and 16 
identical DirectColor visuals ?

Regards




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