PNG_UINT_32_MAX   990 example.c         if (height > PNG_UINT_32_MAX/(sizeof (png_bytep)))
PNG_UINT_32_MAX  1016 pngread.c         if (info_ptr->height > PNG_UINT_32_MAX/(sizeof (png_bytep)))
PNG_UINT_32_MAX   837 pngtrans.c        return PNG_UINT_32_MAX; /* help the app not to fail silently */