Add ability to save/resume a simulation to a state file

src/render.rs

@@ -13,7 +13,7 @@ use imageproc::{pixelops, drawing};
 use rayon::prelude::*;
 use serde::{Serialize, Deserialize};
 use std::fs::File;
-use std::io::{BufWriter, Write as _};
+use std::io::{BufReader, BufWriter, Write as _};
 use std::path::PathBuf;
 use std::sync::{Mutex, RwLock};
 use y4m;
@@ -699,6 +699,11 @@ impl SerializerRenderer {
         //serde_cbor::to_writer(out, &snap).unwrap();
         bincode::serialize_into(out, &frame).unwrap();
     }
+
+    pub fn try_load<S: GenericSim + for <'a> Deserialize<'a>>(&self) -> Option<SerializedFrame<S>> {
+        let mut reader = BufReader::new(File::open(&*self.fmt_str).ok()?);
+        bincode::deserialize_from(&mut reader).ok()
+    }
 }
 
 impl<S: GenericSim + Serialize> Renderer<S> for SerializerRenderer {