Linux puskom-ProLiant-DL385-Gen10 5.4.0-150-generic #167~18.04.1-Ubuntu SMP Wed May 24 00:51:42 UTC 2023 x86_64

/usr/share/doc/libcairo-perl/examples/png/

//usr/share/doc/libcairo-perl/examples/png/README

These files are ports of the cairo-demo/png examples as of 2006-05-28. This stuff isn't done in perlish ways so you've been warned. You'll need png backend support.