Italian to English Other General / Conversation / Greetings / Letters Character-based narrative

This is talking about an actor doing a screen test for a film

Cercavano uno sconvoltone, una faccia da tossico, e lui, per fare colpo, prima si era fumato un paio di canne e poi si era presentato al provino. Gonfio come da copione. Anzi, di più. Actor’s Studio de’noantri.

I do not know what they mean here. I am assuming that "canne" as a spliff of some sort. If this is correct, then is Gonfio suggesting he was stoned? If this is also correct, I have no idea what is meant by "copione" here.