Thorsten Froehlich  wrote in message <45b37458@news.povray.org>:
> Considering that one of the authors of the PNG library was also the author
> of the PNG support in POV-Ray, your argument has neither head nor tail. Sorry.

Well, that explains how he knew of this undocumented function in the first
place. But I do not buy arguments of authority.

Functionally, PoV has no more ties to libpng than GdkPixbuf or dvipng. So
there is two cases:

- 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.

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