> - either png_write_finish_row is a legitimate function to use in a client
>   program, and it should have been made public;
> 
> - or it is indeed private, and it should no more have been used in PoV than
>   in any other client program.
> 
> Obviously, the libpng team has decided in favor of the second solution.

	IIRC this particular libpng function is available again in the
recent libpng releases.  Which would mean that the second possibility
you list above is not as "obvious" as you believe.  One might ask the
libpng devel team to clarify this point (e.g. to update the docs).

	- NC

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