Image to DynamicImage (and test)

src/image.rs

@@ -1,6 +1,8 @@
 use std::path::PathBuf;
 use serde_derive::{Serialize, Deserialize};
 use std::fs::read_to_string;
+use image::{DynamicImage, ImageBuffer};
+use crate::Palette;
 
 #[derive(Debug, Eq, PartialEq, Serialize, Deserialize)]
 pub struct Image {
@@ -21,6 +23,16 @@ impl Image {
 
         Self { name, pixels }
     }
+
+    fn into_image(self, palette: &Palette) -> DynamicImage {
+        let mut buffer: Vec<u8> = Vec::new();
+
+        for pixel in self.pixels {
+            buffer.append(&mut palette.get_colour_rgba8(&pixel));
+        }
+
+        DynamicImage::ImageRgba8(ImageBuffer::from_raw(8, 8, buffer).unwrap())
+    }
 }
 
 #[cfg(test)]
@@ -35,4 +47,16 @@ mod test {
         let expected = crate::mock::image::avatar();
         assert_eq!(output, expected);
     }
+
+    #[test]
+    fn image_to_dynamic_image() {
+        let palette = &crate::mock::palette::default();
+        let output = crate::mock::image::avatar().into_image(palette);
+
+        let expected = image::io::Reader::open(
+            "src/test-resources/images/avatar.png"
+        ).unwrap().decode().unwrap();
+
+        assert_eq!(output, expected);
+    }
 }