diff --git a/src/config.rs b/src/config.rs
index 90c8aee..c23f294 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -102,7 +102,7 @@ impl Config {
                     .help("Colors for rendering the mesh using the Phong reflection model. Requires 3 colors as rgb hex values: ambient, diffuse, and specular. Defaults to blue.")
                     .short('m')
                     .long("material")
-                    .value_names(&["ambient","diffuse","specular"])
+                    .value_names(["ambient","diffuse","specular"])
             )
             .arg(
                 clap::Arg::new("background")
@@ -138,17 +138,21 @@ impl Config {
             .expect("IMG_FILE not provided");
         match matches.get_one::<String>("format") {
             Some(x) => c.format = match_format(x),
-            None => match Path::new(&c.img_filename).extension() {
-                Some(ext) => c.format = match_format(ext.to_str().unwrap()),
-                _ => (),
-            },
+            None => {
+                if let Some(ext) = Path::new(&c.img_filename).extension() {
+                    c.format = match_format(ext.to_str().unwrap());
+                }
+            }
         };
-        matches
-            .get_one::<String>("size")
-            .map(|x| c.width = x.parse::<u32>().expect("Invalid size"));
-        matches
-            .get_one::<String>("size")
-            .map(|x| c.height = x.parse::<u32>().expect("Invalid size"));
+
+        if let Some(x) = matches.get_one::<String>("size") {
+            c.width = x.parse::<u32>().expect("Invalid size");
+        }
+
+        if let Some(x) = matches.get_one::<String>("size") {
+            c.height = x.parse::<u32>().expect("Invalid size");
+        }
+
         c.visible = matches.contains_id("visible");
         c.verbosity = matches.get_count("verbosity") as usize;
         if let Some(materials) = matches.get_many::<String>("material") {
@@ -159,17 +163,16 @@ impl Config {
                 specular: iter.next().unwrap_or([0.0, 0.0, 0.0]),
             };
         }
-        matches
-            .get_one::<String>("background")
-            .map(|x| c.background = html_to_rgba(x));
-        match matches.get_one::<String>("aamethod") {
-            Some(x) => match x.as_str() {
+        if let Some(x) = matches.get_one::<String>("background") {
+            c.background = html_to_rgba(x);
+        }
+        if let Some(x) = matches.get_one::<String>("aamethod") {
+            match x.as_str() {
                 "none" => c.aamethod = AAMethod::None,
                 "fxaa" => c.aamethod = AAMethod::FXAA,
                 _ => unreachable!(),
-            },
-            None => (),
-        };
+            }
+        }
         c.recalc_normals = matches.contains_id("recalc_normals");
 
         c
diff --git a/src/fxaa.rs b/src/fxaa.rs
index 42a71de..9dabbca 100644
--- a/src/fxaa.rs
+++ b/src/fxaa.rs
@@ -30,9 +30,9 @@ struct SpriteVertex {
 implement_vertex!(SpriteVertex, position, i_tex_coords);
 
 impl FxaaSystem {
-    pub fn new<F: ?Sized>(facade: &F) -> FxaaSystem
+    pub fn new<F>(facade: &F) -> FxaaSystem
     where
-        F: Facade,
+        F: Facade + ?Sized,
     {
         FxaaSystem {
             context: facade.get_context().clone(),
@@ -63,7 +63,7 @@ impl FxaaSystem {
             index_buffer: glium::index::IndexBuffer::new(
                 facade,
                 glium::index::PrimitiveType::TriangleStrip,
-                &[1 as u16, 2, 0, 3],
+                &[1u16, 2, 0, 3],
             )
             .unwrap(),
 
@@ -92,7 +92,7 @@ where
     let mut target_depth = system.target_depth.borrow_mut();
 
     {
-        let clear = if let &Some(ref tex) = &*target_color {
+        let clear = if let Some(ref tex) = *target_color {
             tex.get_width() != target_dimensions.0
                 || tex.get_height().unwrap() != target_dimensions.1
         } else {
@@ -104,7 +104,7 @@ where
     }
 
     {
-        let clear = if let &Some(ref tex) = &*target_depth {
+        let clear = if let Some(ref tex) = *target_depth {
             tex.get_dimensions() != target_dimensions
         } else {
             false
@@ -117,8 +117,8 @@ where
     if target_color.is_none() {
         let texture = glium::texture::Texture2d::empty(
             &system.context,
-            target_dimensions.0 as u32,
-            target_dimensions.1 as u32,
+            target_dimensions.0,
+            target_dimensions.1,
         )
         .unwrap();
         *target_color = Some(texture);
@@ -129,8 +129,8 @@ where
         let texture = glium::framebuffer::DepthRenderBuffer::new(
             &system.context,
             glium::texture::DepthFormat::I24,
-            target_dimensions.0 as u32,
-            target_dimensions.1 as u32,
+            target_dimensions.0,
+            target_dimensions.1,
         )
         .unwrap();
         *target_depth = Some(texture);
@@ -143,7 +143,7 @@ where
     );
 
     let uniforms = uniform! {
-        tex: &*target_color,
+        tex: target_color,
         enabled: if enabled { 1i32 } else { 0i32 },
         resolution: (target_dimensions.0 as f32, target_dimensions.1 as f32)
     };
diff --git a/src/lib.rs b/src/lib.rs
index 0495716..632328d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -36,11 +36,8 @@ const CAM_POSITION: cgmath::Point3<f32> = cgmath::Point3 {
 };
 
 fn print_matrix(m: [[f32; 4]; 4]) {
-    for i in 0..4 {
-        debug!(
-            "{:.3}\t{:.3}\t{:.3}\t{:.3}",
-            m[i][0], m[i][1], m[i][2], m[i][3]
-        );
+    for row in &m {
+        debug!("{:.3}\t{:.3}\t{:.3}\t{:.3}", row[0], row[1], row[2], row[3]);
     }
     debug!("");
 }
@@ -175,7 +172,7 @@ where
     let pixel_shader_src = include_str!("shaders/model.frag");
 
     // TODO: Cache program binary
-    let program = glium::Program::from_source(display, &vertex_shader_src, &pixel_shader_src, None);
+    let program = glium::Program::from_source(display, vertex_shader_src, pixel_shader_src, None);
     let program = match program {
         Ok(p) => p,
         Err(glium::CompilationError(err, _)) => {
@@ -246,7 +243,7 @@ where
         target
             .draw(
                 (&vertex_buf, &normal_buf),
-                &indices,
+                indices,
                 &program,
                 &uniforms,
                 &params,
@@ -261,9 +258,8 @@ where
     let pixels: glium::texture::RawImage2d<u8> = texture.read();
     let img = image::ImageBuffer::from_raw(config.width, config.height, pixels.data.into_owned())
         .unwrap();
-    let img = image::DynamicImage::ImageRgba8(img).flipv();
 
-    img
+    image::DynamicImage::ImageRgba8(img).flipv()
 }
 
 pub fn render_to_window(config: Config) -> Result<(), Box<dyn Error>> {
@@ -292,13 +288,14 @@ pub fn render_to_window(config: Config) -> Result<(), Box<dyn Error>> {
         .unwrap();
 
         match ev {
-            glutin::event::Event::WindowEvent { event, .. }
-                if event == glutin::event::WindowEvent::CloseRequested =>
-            {
+            glutin::event::Event::WindowEvent {
+                event: glutin::event::WindowEvent::CloseRequested,
+                ..
+            } => {
                 *control_flow = ControlFlow::Exit;
                 return;
             }
-            glutin::event::Event::NewEvents(cause) if cause == glutin::event::StartCause::Init => {
+            glutin::event::Event::NewEvents(glutin::event::StartCause::Init) => {
                 render_pipeline(&display, &config, &mesh, &mut framebuffer, &texture);
             }
             _ => (),
@@ -330,13 +327,11 @@ pub fn render_to_image(config: &Config) -> Result<image::DynamicImage, Box<dyn E
     // =========================
     let mesh = Mesh::load(&config.stl_filename, config.recalc_normals)?;
 
-    let img: image::DynamicImage;
-
     // Create GL context
     // =================
     // 1. If not visible create a headless context.
     // 2. If headless context creation fails, create a normal context with a hidden window.
-    match create_headless_display(&config) {
+    let img: image::DynamicImage = match create_headless_display(config) {
         Ok(display) => {
             let texture = glium::Texture2d::empty(&display, config.width, config.height).unwrap();
             let depthtexture =
@@ -348,14 +343,14 @@ pub fn render_to_image(config: &Config) -> Result<image::DynamicImage, Box<dyn E
                 &depthtexture,
             )
             .unwrap();
-            img = render_pipeline(&display, &config, &mesh, &mut framebuffer, &texture);
+            render_pipeline(&display, config, &mesh, &mut framebuffer, &texture)
         }
         Err(e) => {
             warn!(
                 "Unable to create headless GL context. Trying hidden window instead. Reason: {:?}",
                 e
             );
-            let (display, _) = create_normal_display(&config)?;
+            let (display, _) = create_normal_display(config)?;
             let texture = glium::Texture2d::empty(&display, config.width, config.height).unwrap();
             let depthtexture =
                 glium::texture::DepthTexture2d::empty(&display, config.width, config.height)
@@ -366,7 +361,7 @@ pub fn render_to_image(config: &Config) -> Result<image::DynamicImage, Box<dyn E
                 &depthtexture,
             )
             .unwrap();
-            img = render_pipeline(&display, &config, &mesh, &mut framebuffer, &texture);
+            render_pipeline(&display, config, &mesh, &mut framebuffer, &texture)
         }
     };
 
@@ -374,7 +369,7 @@ pub fn render_to_image(config: &Config) -> Result<image::DynamicImage, Box<dyn E
 }
 
 pub fn render_to_file(config: &Config) -> Result<(), Box<dyn Error>> {
-    let img = render_to_image(&config)?;
+    let img = render_to_image(config)?;
 
     // Choose output
     // Write to stdout if user did not specify a file
@@ -438,6 +433,11 @@ pub fn render_to_file(config: &Config) -> Result<(), Box<dyn Error>> {
 ///
 /// render_to_buffer(buf_ptr, width, height, stl_filename_c);
 /// ```
+///
+/// # Safety
+///
+/// * `buf_ptr` _must_ point to a valid initialized buffer, at least `width * height * 4` bytes long.
+/// * `stl_filename_c` must point to a valid null-terminated string.
 #[no_mangle]
 pub unsafe extern "C" fn render_to_buffer(
     buf_ptr: *mut u8,
@@ -476,8 +476,8 @@ pub unsafe extern "C" fn render_to_buffer(
     // Setup configuration for the renderer
     let config = Config {
         stl_filename: stl_filename_str.to_string(),
-        width: width,
-        height: height,
+        width,
+        height,
         ..Default::default()
     };
 
diff --git a/src/main.rs b/src/main.rs
index eef7665..23623ee 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -33,11 +33,9 @@ fn main() {
             error!("Application error: {}", e);
             process::exit(1);
         }
-    } else {
-        if let Err(e) = stl_thumb::render_to_file(&config) {
-            error!("Application error: {}", e);
-            process::exit(1);
-        }
+    } else if let Err(e) = stl_thumb::render_to_file(&config) {
+        error!("Application error: {}", e);
+        process::exit(1);
     }
 }
 
diff --git a/src/mesh.rs b/src/mesh.rs
index 928bbc9..1e01680 100644
--- a/src/mesh.rs
+++ b/src/mesh.rs
@@ -337,8 +337,7 @@ impl Mesh {
         let scale = 2.0 / longest;
         info!("Scale:\t{}", scale);
         let scale_matrix = cgmath::Matrix4::from_scale(scale);
-        let matrix = scale_matrix * translation_matrix;
-        matrix
+        scale_matrix * translation_matrix
     }
 }