cursor: refactor CustomCursor to be dyn

cursor: refactor `CustomCursor` to be `dyn`

Same as for `MonitorHandle`, the source was changed to support
all kinds of sources.

src/platform_impl/linux/x11/mod.rs

@@ -36,10 +36,9 @@ use crate::platform::x11::XlibErrorHook;
 use crate::platform_impl::common::xkb::Context;
 use crate::platform_impl::platform::min_timeout;
 use crate::platform_impl::x11::window::Window;
-use crate::platform_impl::PlatformCustomCursor;
 use crate::utils::Lazy;
 use crate::window::{
-    CustomCursor as RootCustomCursor, CustomCursorSource, Theme, Window as CoreWindow,
+    CustomCursor as CoreCustomCursor, CustomCursorSource, Theme, Window as CoreWindow,
     WindowAttributes, WindowId,
 };
 
@@ -731,10 +730,8 @@ impl RootActiveEventLoop for ActiveEventLoop {
     fn create_custom_cursor(
         &self,
         custom_cursor: CustomCursorSource,
-    ) -> Result<RootCustomCursor, RequestError> {
-        Ok(RootCustomCursor {
-            inner: PlatformCustomCursor::X(CustomCursor::new(self, custom_cursor.inner)?),
-        })
+    ) -> Result<CoreCustomCursor, RequestError> {
+        Ok(CoreCustomCursor(Arc::new(CustomCursor::new(self, custom_cursor)?)))
     }
 
     fn available_monitors(&self) -> Box<dyn Iterator<Item = CoreMonitorHandle>> {

src/platform_impl/linux/x11/util/cursor.rs

@@ -9,8 +9,8 @@ use x11rb::protocol::xproto;
 
 use super::super::ActiveEventLoop;
 use super::*;
-use crate::error::RequestError;
-use crate::platform_impl::PlatformCustomCursorSource;
+use crate::cursor::{CustomCursorProvider, CustomCursorSource};
+use crate::error::{NotSupportedError, RequestError};
 use crate::window::CursorIcon;
 
 impl XConnection {
@@ -36,7 +36,7 @@ impl XConnection {
         window: xproto::Window,
         cursor: &CustomCursor,
     ) -> Result<(), X11Error> {
-        self.update_cursor(window, cursor.inner.cursor)
+        self.update_cursor(window, cursor.cursor)
     }
 
     /// Create a cursor from an image.
@@ -170,32 +170,45 @@ pub enum SelectedCursor {
     Named(CursorIcon),
 }
 
+impl Default for SelectedCursor {
+    fn default() -> Self {
+        SelectedCursor::Named(Default::default())
+    }
+}
+
 #[derive(Debug, Clone)]
 pub struct CustomCursor {
-    inner: Arc<CustomCursorInner>,
+    xconn: Arc<XConnection>,
+    cursor: xproto::Cursor,
 }
 
 impl Hash for CustomCursor {
     fn hash<H: Hasher>(&self, state: &mut H) {
-        Arc::as_ptr(&self.inner).hash(state);
+        self.cursor.hash(state);
     }
 }
 
 impl PartialEq for CustomCursor {
     fn eq(&self, other: &Self) -> bool {
-        Arc::ptr_eq(&self.inner, &other.inner)
+        self.cursor == other.cursor
     }
 }
-
 impl Eq for CustomCursor {}
 
 impl CustomCursor {
     pub(crate) fn new(
         event_loop: &ActiveEventLoop,
-        mut cursor: PlatformCustomCursorSource,
+        cursor: CustomCursorSource,
     ) -> Result<CustomCursor, RequestError> {
+        let mut cursor = match cursor {
+            CustomCursorSource::Image(cursor_image) => cursor_image,
+            CustomCursorSource::Animation { .. } | CustomCursorSource::Url { .. } => {
+                return Err(NotSupportedError::new("unsupported cursor kind").into())
+            },
+        };
+
         // Reverse RGBA order to BGRA.
-        cursor.0.rgba.chunks_mut(4).for_each(|chunk| {
+        cursor.rgba.chunks_mut(4).for_each(|chunk| {
             let chunk: &mut [u8; 4] = chunk.try_into().unwrap();
             chunk[0..3].reverse();
 
@@ -209,32 +222,26 @@ impl CustomCursor {
         let cursor = event_loop
             .xconn
             .create_cursor_from_image(
-                cursor.0.width,
-                cursor.0.height,
-                cursor.0.hotspot_x,
-                cursor.0.hotspot_y,
-                &cursor.0.rgba,
+                cursor.width,
+                cursor.height,
+                cursor.hotspot_x,
+                cursor.hotspot_y,
+                &cursor.rgba,
             )
             .map_err(|err| os_error!(err))?;
 
-        Ok(Self { inner: Arc::new(CustomCursorInner { xconn: event_loop.xconn.clone(), cursor }) })
+        Ok(Self { xconn: event_loop.xconn.clone(), cursor })
     }
 }
 
-#[derive(Debug)]
-struct CustomCursorInner {
-    xconn: Arc<XConnection>,
-    cursor: xproto::Cursor,
-}
-
-impl Drop for CustomCursorInner {
+impl Drop for CustomCursor {
     fn drop(&mut self) {
         self.xconn.xcb_connection().free_cursor(self.cursor).map(|r| r.ignore_error()).ok();
     }
 }
 
-impl Default for SelectedCursor {
-    fn default() -> Self {
-        SelectedCursor::Named(Default::default())
+impl CustomCursorProvider for CustomCursor {
+    fn is_animated(&self) -> bool {
+        false
     }
 }

src/platform_impl/linux/x11/window.rs

@@ -19,10 +19,11 @@ use x11rb::protocol::{randr, xinput};
 
 use super::util::{self, SelectedCursor};
 use super::{
-    ffi, ActiveEventLoop, CookieResultExt, ImeRequest, ImeSender, VoidCookie, XConnection,
+    ffi, ActiveEventLoop, CookieResultExt, CustomCursor, ImeRequest, ImeSender, VoidCookie,
+    XConnection,
 };
 use crate::application::ApplicationHandler;
-use crate::cursor::{Cursor, CustomCursor as RootCustomCursor};
+use crate::cursor::Cursor;
 use crate::dpi::{PhysicalInsets, PhysicalPosition, PhysicalSize, Position, Size};
 use crate::error::{NotSupportedError, RequestError};
 use crate::event::{SurfaceSizeWriter, WindowEvent};
@@ -35,7 +36,7 @@ use crate::platform_impl::x11::atoms::*;
 use crate::platform_impl::x11::{
     xinput_fp1616_to_float, MonitorHandle as X11MonitorHandle, WakeSender, X11Error,
 };
-use crate::platform_impl::{common, PlatformCustomCursor, PlatformIcon};
+use crate::platform_impl::{common, PlatformIcon};
 use crate::window::{
     CursorGrabMode, ImePurpose, ResizeDirection, Theme, UserAttentionType, Window as CoreWindow,
     WindowAttributes, WindowButtons, WindowId, WindowLevel,
@@ -1808,19 +1809,23 @@ impl UnownedWindow {
                     }
                 }
             },
-            Cursor::Custom(RootCustomCursor { inner: PlatformCustomCursor::X(cursor) }) => {
+            Cursor::Custom(cursor) => {
+                let cursor = match cursor.cast_ref::<CustomCursor>() {
+                    Some(cursor) => cursor,
+                    None => {
+                        tracing::error!("unrecognized cursor passed to X11 backend");
+                        return;
+                    },
+                };
+
                 #[allow(clippy::mutex_atomic)]
                 if *self.cursor_visible.lock().unwrap() {
-                    if let Err(err) = self.xconn.set_custom_cursor(self.xwindow, &cursor) {
+                    if let Err(err) = self.xconn.set_custom_cursor(self.xwindow, cursor) {
                         tracing::error!("failed to set window icon: {err}");
                     }
                 }
 
-                *self.selected_cursor.lock().unwrap() = SelectedCursor::Custom(cursor);
-            },
-            #[cfg(wayland_platform)]
-            Cursor::Custom(RootCustomCursor { inner: PlatformCustomCursor::Wayland(_) }) => {
-                tracing::error!("passed a Wayland cursor to X11 backend")
+                *self.selected_cursor.lock().unwrap() = SelectedCursor::Custom(cursor.clone());
             },
         }
     }