clippy fixes

anvil/src/drawing.rs

@@ -1,3 +1,5 @@
+#![allow(clippy::too_many_arguments)]
+
 use std::{
     cell::RefCell,
     rc::Rc,

anvil/src/input_handler.rs

@@ -290,7 +290,7 @@ fn process_keyboard_shortcut(modifiers: ModifiersState, keysym: Keysym) -> KeyAc
         // ctrl+alt+backspace = quit
         // logo + q = quit
         KeyAction::Quit
-    } else if keysym >= xkb::KEY_XF86Switch_VT_1 && keysym <= xkb::KEY_XF86Switch_VT_12 {
+    } else if (xkb::KEY_XF86Switch_VT_1..=xkb::KEY_XF86Switch_VT_12).contains(&keysym) {
         // VTSwicth
         KeyAction::VtSwitch((keysym - xkb::KEY_XF86Switch_VT_1 + 1) as i32)
     } else if modifiers.logo && keysym == xkb::KEY_Return {

anvil/src/udev.rs

@@ -436,7 +436,7 @@ impl<Data: 'static> UdevHandlerImpl<Data> {
                             self.logger.clone(),
                         ),
                         GbmDevice::new(
-                            fd.clone()
+                            fd
                         ),
                     )
                 }
@@ -513,7 +513,7 @@ impl<Data: 'static> UdevHandlerImpl<Data> {
                 window_map: self.window_map.clone(),
                 output_map: self.output_map.clone(),
                 pointer_location: self.pointer_location.clone(),
-                pointer_image: pointer_image,
+                pointer_image,
                 cursor_status: self.cursor_status.clone(),
                 dnd_icon: self.dnd_icon.clone(),
                 logger: self.logger.clone(),
@@ -694,14 +694,12 @@ impl DrmRenderer {
                     match err {
                         SwapBuffersError::AlreadySwapped => false,
                         SwapBuffersError::TemporaryFailure(err) => {
-                            match err.downcast_ref::<DrmError>() {
-                                Some(&DrmError::DeviceInactive) => false,
+                            !matches!(err.downcast_ref::<DrmError>(),
+                                Some(&DrmError::DeviceInactive) |
                                 Some(&DrmError::Access {
                                     source: drm::SystemError::PermissionDenied,
                                     ..
-                                }) => false,
-                                _ => true,
-                            }
+                                }))
                         }
                         SwapBuffersError::ContextLost(err) => panic!("Rendering loop lost: {}", err),
                     };
@@ -751,6 +749,7 @@ impl DrmRenderer {
         }
     }
 
+    #[allow(clippy::too_many_arguments)]
     fn render_surface(
         surface: &mut RenderSurface,
         texture_destruction_callback: &mpsc::Sender<Gles2Texture>,
@@ -795,7 +794,7 @@ impl DrmRenderer {
                 width: width as i32,
                 height: height as i32,
             }),
-            compositor_token.clone(),
+            *compositor_token,
             logger,
         )?;
 
@@ -810,7 +809,7 @@ impl DrmRenderer {
             {
                 if let Some(ref wl_surface) = dnd_icon.as_ref() {
                     if wl_surface.as_ref().is_alive() {
-                        draw_dnd_icon(surface, device_id, texture_destruction_callback, buffer_utils, wl_surface, (ptr_x, ptr_y), compositor_token.clone(), logger)?;
+                        draw_dnd_icon(surface, device_id, texture_destruction_callback, buffer_utils, wl_surface, (ptr_x, ptr_y), *compositor_token, logger)?;
                     }
                 }
             }
@@ -833,7 +832,7 @@ impl DrmRenderer {
                         buffer_utils,
                         wl_surface,
                         (ptr_x, ptr_y),
-                        compositor_token.clone(),
+                        *compositor_token,
                         logger,
                     )?;
                 } else {

src/backend/allocator/dmabuf.rs

@@ -116,7 +116,7 @@ impl Dmabuf {
 
 impl WeakDmabuf {
     pub fn upgrade(&self) -> Option<Dmabuf> {
-        self.0.upgrade().map(|internal| Dmabuf(internal))
+        self.0.upgrade().map(Dmabuf)
     }
 }
 

src/backend/allocator/gbm.rs

@@ -54,14 +54,16 @@ impl<T> std::convert::TryFrom<GbmBuffer<T>> for Dmabuf {
         //TODO switch to gbm_bo_get_plane_fd when it lands
         let mut iter = (0i32..planes).map(|i| buf.handle_for_plane(i));
         let first = iter.next().expect("Encountered a buffer with zero planes");
-        if iter.try_fold(first, |first, next| {
+        // check that all handles are the same
+        let handle = iter.try_fold(first, |first, next| {
             if let (Ok(next), Ok(first)) = (next, first) {
                 if unsafe { next.u64_ == first.u64_ } {
                     return Some(Ok(first));
                 }
             }
             None
-        }).is_none() {
+        });
+        if handle.is_none() {
             // GBM is lacking a function to get a FD for a given plane. Instead,
             // check all planes have the same handle. We can't use
             // drmPrimeHandleToFD because that messes up handle ref'counting in

src/backend/allocator/swapchain.rs

@@ -103,7 +103,7 @@ where
     }
 
     pub fn acquire(&mut self) -> Result<Option<Slot<D, U>>, SwapchainError<E1, E2>> {
-        if let Some(free_slot) = self.slots.iter_mut().filter(|s| !s.acquired.load(Ordering::SeqCst)).next() {
+        if let Some(free_slot) = self.slots.iter_mut().find(|s| !s.acquired.load(Ordering::SeqCst)) {
             if free_slot.buffer.is_none() {
                 free_slot.buffer = Arc::new(Some(
                     self.allocator

src/backend/drm/error.rs

@@ -60,22 +60,21 @@ pub enum Error {
     TestFailed(crtc::Handle),
 }
 
-impl Into<SwapBuffersError> for Error {
-    fn into(self) -> SwapBuffersError {
-        match self {
+impl From<Error> for SwapBuffersError {
+    fn from(err: Error) -> SwapBuffersError {
+        match err {
             x @ Error::DeviceInactive => SwapBuffersError::TemporaryFailure(Box::new(x)),
             Error::Access {
                 errmsg, dev, source, ..
-            } if match source {
-                drm::SystemError::PermissionDenied => true,
+            } if matches!(source,
+                drm::SystemError::PermissionDenied |
                 drm::SystemError::Unknown {
                     errno: nix::errno::Errno::EBUSY,
-                } => true,
+                } |
                 drm::SystemError::Unknown {
                     errno: nix::errno::Errno::EINTR,
-                } => true,
-                _ => false,
-            } =>
+                }
+            ) =>
             {
                 SwapBuffersError::TemporaryFailure(Box::new(Error::Access { errmsg, dev, source }))
             }

src/backend/drm/render.rs

@@ -40,6 +40,7 @@ where
     E2: std::error::Error + 'static,
     E3: std::error::Error + 'static,
 {
+    #[allow(clippy::type_complexity)]
     pub fn new<L: Into<Option<::slog::Logger>>>(drm: DrmSurface<D>, allocator: A, renderer: R, log: L) -> Result<DrmRenderSurface<D, A, R, B>, Error<E1, E2, E3>>
     {
         // we cannot simply pick the first supported format of the intersection of *all* formats, because:
@@ -102,6 +103,7 @@ where
         DrmRenderSurface::new_internal(drm, allocator, renderer, iter, logger)
     }
 
+    #[allow(clippy::type_complexity)]
     fn new_internal(drm: Arc<DrmSurface<D>>, allocator: A, mut renderer: R, mut formats: impl Iterator<Item=Format>, logger: ::slog::Logger) -> Result<DrmRenderSurface<D, A, R, B>, Error<E1, E2, E3>>
     {
         let format = formats.next().ok_or(Error::NoSupportedPlaneFormat)?;

src/backend/drm/surface/atomic.rs

@@ -34,6 +34,7 @@ pub struct AtomicDrmSurface<A: AsRawFd + 'static> {
 }
 
 impl<A: AsRawFd + 'static> AtomicDrmSurface<A> {
+    #[allow(clippy::too_many_arguments)]
     pub fn new(
         fd: Arc<DrmDeviceInternal<A>>,
         active: Arc<AtomicBool>,

src/backend/egl/context.rs

@@ -280,9 +280,6 @@ pub struct PixelFormatRequirements {
     /// Contains the minimum number of samples per pixel in the color, depth and stencil buffers.
     /// `None` means "don't care". Default is `None`. A value of `Some(0)` indicates that multisampling must not be enabled.
     pub multisampling: Option<u16>,
-    /// If `true`, only stereoscopic formats will be considered. If `false`, only non-stereoscopic formats.
-    /// The default is `false`.
-    pub stereoscopy: bool,
 }
 
 impl Default for PixelFormatRequirements {
@@ -296,14 +293,13 @@ impl Default for PixelFormatRequirements {
             stencil_bits: Some(8),
             double_buffer: Some(true),
             multisampling: None,
-            stereoscopy: false,
         }
     }
 }
 
 impl PixelFormatRequirements {
     /// Append the  requirements to the given attribute list
-    pub fn create_attributes(&self, out: &mut Vec<c_int>, logger: &slog::Logger) -> Result<(), ()> {
+    pub fn create_attributes(&self, out: &mut Vec<c_int>, logger: &slog::Logger) {
         if let Some(hardware_accelerated) = self.hardware_accelerated {
             out.push(ffi::egl::CONFIG_CAVEAT as c_int);
             out.push(if hardware_accelerated {
@@ -358,12 +354,5 @@ impl PixelFormatRequirements {
             out.push(ffi::egl::SAMPLES as c_int);
             out.push(multisampling as c_int);
         }
-
-        if self.stereoscopy {
-            error!(logger, "Stereoscopy is currently unsupported (sorry!)");
-            return Err(());
-        }
-
-        Ok(())
     }
 }

src/backend/egl/display.rs

@@ -217,9 +217,7 @@ impl EGLDisplay {
                 }
             };
 
-            reqs.create_attributes(&mut out, &self.logger)
-                .map_err(|()| Error::NoAvailablePixelFormat)?;
-
+            reqs.create_attributes(&mut out, &self.logger);
             out.push(ffi::egl::NONE as c_int);
             out
         };
@@ -363,10 +361,8 @@ impl EGLDisplay {
             return Err(Error::EglExtensionNotSupported(&["EGL_KHR_image_base", "EGL_EXT_image_dma_buf_import"]));
         }
 
-        if dmabuf.has_modifier() {
-            if !self.extensions.iter().any(|s| s == "EGL_EXT_image_dma_buf_import_modifiers") {
-                return Err(Error::EglExtensionNotSupported(&["EGL_EXT_image_dma_buf_import_modifiers"]));
-            }
+        if dmabuf.has_modifier() && !self.extensions.iter().any(|s| s == "EGL_EXT_image_dma_buf_import_modifiers") {
+            return Err(Error::EglExtensionNotSupported(&["EGL_EXT_image_dma_buf_import_modifiers"]));
         };
 
         let mut out: Vec<c_int> = Vec::with_capacity(50);
@@ -515,11 +511,11 @@ fn get_dmabuf_formats(display: &ffi::egl::types::EGLDisplay, extensions: &[Strin
         if num == 0 {
             texture_formats.insert(DrmFormat {
                 code: fourcc,
-                modifier: Modifier::Invalid.into()
+                modifier: Modifier::Invalid
             });
             render_formats.insert(DrmFormat {
                 code: fourcc,
-                modifier: Modifier::Invalid.into()
+                modifier: Modifier::Invalid
             });
         } else {
             let mut mods: Vec<u64> = Vec::with_capacity(num as usize);
@@ -650,10 +646,11 @@ impl EGLBufferReader {
 
         let mut images = Vec::with_capacity(format.num_planes());
         for i in 0..format.num_planes() {
-            let mut out = Vec::with_capacity(3);
-            out.push(ffi::egl::WAYLAND_PLANE_WL as i32);
-            out.push(i as i32);
-            out.push(ffi::egl::NONE as i32);
+            let out = [
+                ffi::egl::WAYLAND_PLANE_WL as i32,
+                i as i32,
+                ffi::egl::NONE as i32,
+            ];
 
             images.push({
                 wrap_egl_call(|| unsafe {

src/backend/renderer/gles2/mod.rs

@@ -559,11 +559,11 @@ impl Renderer for Gles2Renderer {
         Ok(texture)
     }
     
-    fn destroy_texture(&mut self, mut texture: Self::TextureId) -> Result<(), Self::Error> {
+    fn destroy_texture(&mut self, texture: Self::TextureId) -> Result<(), Self::Error> {
         self.make_current()?;
 
         unsafe {
-            self.gl.DeleteTextures(1, &mut texture.texture);
+            self.gl.DeleteTextures(1, &texture.texture);
         }
         self.egl.unbind()?;
 

src/lib.rs

@@ -1,4 +1,7 @@
 #![warn(missing_docs, rust_2018_idioms)]
+// Allow acronyms like EGL
+#![allow(clippy::upper_case_acronyms)]
+
 //! **Smithay: the Wayland compositor smithy**
 //!
 //! Most entry points in the modules can take an optional [`slog::Logger`](::slog::Logger) as argument
@@ -7,9 +10,6 @@
 //! `log` crate. If not, the logs will discarded. This cargo feature is part of the default set of
 //! features of Smithay.
 
-// `error_chain!` can recurse deeply
-#![recursion_limit = "1024"]
-
 #[cfg_attr(feature = "backend_session", macro_use)]
 #[doc(hidden)]
 pub extern crate nix;