png_set_option   1570 contrib/libtests/pngvalid.c                if (png_set_option(ps->pwrite, ps->options[opt].option,
png_set_option   1699 contrib/libtests/pngvalid.c             if (png_set_option(ps->pread, ps->options[opt].option,
png_set_option   3251 png.h          PNG_EXPORT(244, int, png_set_option, (png_structrp png_ptr, int option,