-#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
- png_byte heuristic_method; /* heuristic for row filter selection */
- png_byte num_prev_filters; /* number of weights for previous rows */
- png_bytep prev_filters; /* filter type(s) of previous row(s) */
- png_uint_16p filter_weights; /* weight(s) for previous line(s) */
- png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */
- png_uint_16p filter_costs; /* relative filter calculation cost */
- png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */
-#endif
-
- /* Options */