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void nfbHelpValidateGC ( register GCPtr pGC, Mask changes, DrawablePtr pDraw);
pGC
planemask
, alu
,
and color
for the GC.
changes
pDraw
Pdraw->pScreen
member points to the
ScreenRec(D4nfb)
structure; your screen private data is connected
to the bottom of the ScreenRec structure.