Question on libpixman's PIXMAN_FB_ACCESSORS

[Samuel Xu <samuel.xu.tech@gmail.com>]

I noticed the PIXMAN_FB_ACCESSORS might not be defined/enabled for
pixman lib in current build.
inside pixman-accessor.h
#ifdef PIXMAN_FB_ACCESSORS
...
#else
..
#endif

Could any kindly share viewpoint of PIXMAN_FB_ACCESSORS? E.g. Is it
obsolete or it only can be enabled for some platform with specific HW,
so some low-end platform can’t turn it on?

Thanks!
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