refactor: restructured the architecture of Renderer

.gitignore

@@ -1,2 +1,3 @@
 .idea
 /target
+image.png

src/error.rs

@@ -0,0 +1,5 @@
+#[derive(thiserror::Error, Debug)]
+pub enum LithiumError {
+    #[error("There is no camera with the ID {0}")]
+    CameraNotFound(usize),
+}

src/main.rs

@@ -1,46 +1,16 @@
-pub mod output;
 pub mod render;
+pub mod error;
 
-use crate::output::{Metadata, Output};
 use crate::render::Renderer;
 use anyhow::Result;
-use image::RgbImage;
-
-struct TestOutput {
-    width: u32,
-    height: u32,
-    image: RgbImage,
-}
-
-impl output::Output for TestOutput {
-    fn get_meta(&self) -> Metadata {
-        Metadata {
-            width: self.width,
-            height: self.height,
-        }
-    }
-
-    fn render(&mut self, buffer: &RgbImage) -> Result<()> {
-        self.image = buffer.clone();
-        self.image.save("image.png")?;
-        Ok(())
-    }
-}
-
-impl TestOutput {
-    fn new(width: u32, height: u32) -> Self {
-        Self {
-            width,
-            height,
-            image: RgbImage::new(width, height),
-        }
-    }
-}
 
 #[tokio::main]
 async fn main() -> Result<()> {
     let mut renderer = Renderer::new();
-    renderer.add_camera(TestOutput::new(512, 512));
+    let camera = renderer.add_camera(512, 512);
+    
+    let image = renderer.render(camera).await?;
+    image.save("image.png")?;
     
     Ok(())
 }

src/output.rs

@@ -1,12 +0,0 @@
-use anyhow::Result;
-use image::RgbImage;
-
-pub struct Metadata {
-    pub height: u32,
-    pub width: u32,
-}
-
-pub trait Output {
-    fn get_meta(&self) -> Metadata;
-    fn render(&mut self, buffer: &RgbImage) -> Result<()>;
-}

src/render/camera.rs

@@ -1,13 +1,18 @@
-use crate::output::Output;
-
 pub struct Camera {
-    output: Box<dyn Output>,
+    width: u32,
+    height: u32,
 }
 
 impl Camera {
-    pub fn new(output: impl Output + 'static) -> Self {
-        Self {
-            output: Box::new(output),
+    pub fn new(width: u32, height: u32) -> Self {
+        Self { width, height }
     }
+
+    pub fn height(&self) -> u32 {
+        self.height
+    }
+
+    pub fn width(&self) -> u32 {
+        self.width
     }
 }

src/render/mod.rs

@@ -1,8 +1,8 @@
 pub mod camera;
 
-use crate::output::Output;
-use crate::render::camera::Camera;
-
+use crate::{error::LithiumError, render::camera::Camera};
+use anyhow::Result;
+use image::RgbImage;
 use lithium_loader::Model;
 use slab::Slab;
 
@@ -19,7 +19,17 @@ impl Renderer {
         }
     }
 
-    pub fn add_camera(&mut self, output: impl Output + 'static) -> usize {
-        self.cameras.insert(Camera::new(output))
+    pub fn add_camera(&mut self, width: u32, height: u32) -> usize {
+        self.cameras.insert(Camera::new(width, height))
+    }
+
+    pub async fn render(&self, camera: usize) -> Result<image::RgbImage, LithiumError> {
+        let camera = self
+            .cameras
+            .get(camera)
+            .ok_or(LithiumError::CameraNotFound(camera))?;
+        let result = RgbImage::new(camera.height(), camera.width());
+
+        Ok(result)
     }
 }