1use crate::Globals;
2use crate::platform::linux::{DEFAULT_CURSOR_ICON_NAME, log_cursor_icon_warning};
3use anyhow::{Context as _, anyhow};
4use util::ResultExt;
5
6use wayland_client::Connection;
7use wayland_client::protocol::wl_surface::WlSurface;
8use wayland_client::protocol::{wl_pointer::WlPointer, wl_shm::WlShm};
9use wayland_cursor::{CursorImageBuffer, CursorTheme};
10
11pub(crate) struct Cursor {
12 loaded_theme: Option<LoadedTheme>,
13 size: u32,
14 scaled_size: u32,
15 surface: WlSurface,
16 shm: WlShm,
17 connection: Connection,
18}
19
20pub(crate) struct LoadedTheme {
21 theme: CursorTheme,
22 name: Option<String>,
23 scaled_size: u32,
24}
25
26impl Drop for Cursor {
27 fn drop(&mut self) {
28 self.loaded_theme.take();
29 self.surface.destroy();
30 }
31}
32
33impl Cursor {
34 pub fn new(connection: &Connection, globals: &Globals, size: u32) -> Self {
35 let mut this = Self {
36 loaded_theme: None,
37 size,
38 scaled_size: size,
39 surface: globals.compositor.create_surface(&globals.qh, ()),
40 shm: globals.shm.clone(),
41 connection: connection.clone(),
42 };
43 this.set_theme_internal(None);
44 this
45 }
46
47 fn set_theme_internal(&mut self, theme_name: Option<String>) {
48 if let Some(loaded_theme) = self.loaded_theme.as_ref()
49 && loaded_theme.name == theme_name
50 && loaded_theme.scaled_size == self.scaled_size
51 {
52 return;
53 }
54 let result = if let Some(theme_name) = theme_name.as_ref() {
55 CursorTheme::load_from_name(
56 &self.connection,
57 self.shm.clone(),
58 theme_name,
59 self.scaled_size,
60 )
61 } else {
62 CursorTheme::load(&self.connection, self.shm.clone(), self.scaled_size)
63 };
64 if let Some(theme) = result
65 .context("Wayland: Failed to load cursor theme")
66 .log_err()
67 {
68 self.loaded_theme = Some(LoadedTheme {
69 theme,
70 name: theme_name,
71 scaled_size: self.scaled_size,
72 });
73 }
74 }
75
76 pub fn set_theme(&mut self, theme_name: String) {
77 self.set_theme_internal(Some(theme_name));
78 }
79
80 fn set_scaled_size(&mut self, scaled_size: u32) {
81 self.scaled_size = scaled_size;
82 let theme_name = self
83 .loaded_theme
84 .as_ref()
85 .and_then(|loaded_theme| loaded_theme.name.clone());
86 self.set_theme_internal(theme_name);
87 }
88
89 pub fn set_size(&mut self, size: u32) {
90 self.size = size;
91 self.set_scaled_size(size);
92 }
93
94 pub fn set_icon(
95 &mut self,
96 wl_pointer: &WlPointer,
97 serial_id: u32,
98 mut cursor_icon_names: &[&str],
99 scale: i32,
100 ) {
101 self.set_scaled_size(self.size * scale as u32);
102
103 let Some(loaded_theme) = &mut self.loaded_theme else {
104 log::warn!("Wayland: Unable to load cursor themes");
105 return;
106 };
107 let mut theme = &mut loaded_theme.theme;
108
109 let mut buffer: &CursorImageBuffer;
110 'outer: {
111 for cursor_icon_name in cursor_icon_names {
112 if let Some(cursor) = theme.get_cursor(cursor_icon_name) {
113 buffer = &cursor[0];
114 break 'outer;
115 }
116 }
117
118 if let Some(cursor) = theme.get_cursor(DEFAULT_CURSOR_ICON_NAME) {
119 buffer = &cursor[0];
120 log_cursor_icon_warning(anyhow!(
121 "wayland: Unable to get cursor icon {:?}. \
122 Using default cursor icon: '{}'",
123 cursor_icon_names,
124 DEFAULT_CURSOR_ICON_NAME
125 ));
126 } else {
127 log_cursor_icon_warning(anyhow!(
128 "wayland: Unable to fallback on default cursor icon '{}' for theme '{}'",
129 DEFAULT_CURSOR_ICON_NAME,
130 loaded_theme.name.as_deref().unwrap_or("default")
131 ));
132 return;
133 }
134 }
135
136 let (width, height) = buffer.dimensions();
137 let (hot_x, hot_y) = buffer.hotspot();
138
139 self.surface.set_buffer_scale(scale);
140
141 wl_pointer.set_cursor(
142 serial_id,
143 Some(&self.surface),
144 hot_x as i32 / scale,
145 hot_y as i32 / scale,
146 );
147
148 self.surface.attach(Some(buffer), 0, 0);
149 self.surface.damage(0, 0, width as i32, height as i32);
150 self.surface.commit();
151 }
152}