png_doublep       508 extra_lib/include/png/png.h #define png_doublep_NULL          (png_doublep)NULL
png_doublep      1910 extra_lib/include/png/png.h    int heuristic_method, int num_weights, png_doublep filter_weights,
png_doublep      1911 extra_lib/include/png/png.h    png_doublep filter_costs));