rtiow: include render time in metadata written.

rtiow/src/output.rs

@@ -3,6 +3,7 @@ use std::fs::File;
 use std::path::Path;
 use std::sync::Arc;
 use std::sync::Mutex;
+use std::time;
 
 use chrono::Local;
 use image;
@@ -38,6 +39,7 @@ struct ImageMetadata {
 #[serde(rename_all = "camelCase")]
 struct Data<'s> {
     timestamp: i64,
+    render_time_seconds: f32,
     scene: &'s Scene,
     image_metadata: Vec<ImageMetadata>,
 }
@@ -115,7 +117,11 @@ trait ImageSaver {
         Q: AsRef<Path> + Sized;
 }
 
-pub fn write_images<P: AsRef<Path>>(scene: &Scene, output_dir: P) -> std::io::Result<()> {
+pub fn write_images<P: AsRef<Path>>(
+    scene: &Scene,
+    render_time: time::Duration,
+    output_dir: P,
+) -> std::io::Result<()> {
     let output_dir: &Path = output_dir.as_ref();
     let debugger = DEBUGGER.lock().unwrap();
     let now = Local::now();
@@ -204,6 +210,7 @@ pub fn write_images<P: AsRef<Path>>(scene: &Scene, output_dir: P) -> std::io::Re
         f,
         &Data {
             timestamp: now.timestamp(),
+            render_time_seconds: render_time.as_secs_f32(),
             scene,
             image_metadata,
         },

rtiow/src/renderer.rs

@@ -641,5 +641,5 @@ pub fn render(scene: Scene, output_dir: &Path) -> std::result::Result<(), std::i
         progress(&Default::default(), &current_stat, time_diff, pixel_total)
     );
 
-    output::write_images(&scene, output_dir)
+    output::write_images(&scene, time_diff, output_dir)
 }