321         std::string_view filename = { argv[0] };  in main()  local
322         if (filename.ends_with(".png")) {  in main()
323             baseName = filename.substr(0, filename.size()-4);  in main()
327             baseName = filename;  in main()
373         std::string filename;  in main()  local
375             filename = baseName;  in main()
377                 filename += "_";  in main()
378                 filename += std::to_string(i);  in main()
380             filename += suffix;  in main()
383         if (!filename.empty()) {  in main()
384             fn = filename.c_str();  in main()