Wouldn't it be safer to use something like the following code, just in
case some users are still working with an old version of libpng? That
way it works for everyone.
#if PNG_LIBPNG_VER_MAJOR >= 1 && PNG_LIBPNG_VER_MINOR >= 4
GdImageBufferRead(png_get_io_ptr(pstruct), pointer, size);
#else
GdImageBufferRead(pstruct->io_ptr, pointer, size);
#endif
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