Question about nplanes and ColormapEntries in VisualRec

[Ian Romanick]

I'm making some changes to the server-side GLX in the DRI tree.  For 
part of my changes I want to eliminate the need for libGLcore to have 
access to a VisualRec (programs/Xserver/include/scrnintstr.h, line 68). 
 There are only two fields from that structure that are accessed by 
libGLcore, and I believe those values can be otherwise derrived, but I 
want to be sure.

First, a comment in the structure says that nplanes is "log2 
(ColormapEntries)."  Does that mean that "(1U<< v->nplanes) == 
v->ColormapEntries" is always true?

Second, for TrueColor and DirectColor visuals, is it safe to assume 
nplanes is the sum of the red, green, and blue bits?

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