+; Added at version 1.2.6
+ png_set_user_limits
+ png_get_user_height_max
+ png_get_user_width_max
+; Added at version 1.2.7
+ png_set_add_alpha
+
+; Added at version 1.2.9
+ png_get_uint_32
+ png_save_uint_32
+ png_get_uint_16
+ png_save_uint_16
+ png_get_int_32
+ png_save_int_32
+ png_get_uint_31
+ png_set_expand_gray_1_2_4_to_8
+