137     png_structp, png_set_write_fn, png_get_io_ptr,

   137     png_structp, png_set_write_fn, png_get_io_ptr,

   138     png_get_libpng_ver, png_create_write_struct,

   138     png_get_libpng_ver, png_create_write_struct,

   139     png_create_info_struct, png_destroy_write_struct,

   139     png_create_info_struct, png_destroy_write_struct,

   140     png_write_row, png_set_ihdr, png_write_info,

   140     png_write_row, png_set_ihdr, png_write_info,

   141     png_write_end : procedure;

   141     png_write_end : procedure;