1 files changed, 59 insertions, 0 deletions
diff --git a/src/conn_info/cursors.rs b/src/conn_info/cursors.rs
new file mode 100644
index 0000000..119de5c
--- /dev/null
+++ b/src/conn_info/cursors.rs
@@ -0,0 +1,59 @@
+use crate::error::Result;
+use xcb::{
+    x::{CreateGlyphCursor, Cursor, Font, OpenFont},
+    Connection,
+};
+
+// https://tronche.com/gui/x/xlib/appendix/b/
+const XC_LEFT_PTR: u16 = 68;
+
+/// Caches X11 cursor objects
+#[derive(Debug)]
+pub struct Cursors {
+    #[allow(unused)] // Needs to be kept around since the cursors depend on it
+    font: Font,
+
+    normal: Cursor,
+}
+
+impl Cursors {
+    /// Load default cursors using the given connection.
+    pub fn new_with(conn: &Connection) -> Result<Self> {
+        // Open cursor font
+        let font = conn.generate_id();
+        conn.check_request(conn.send_request_checked(&OpenFont {
+            fid: font,
+            name: b"cursor",
+        }))?;
+
+        Ok(Self {
+            normal: Self::load_cursor(conn, font, XC_LEFT_PTR)?,
+            font,
+        })
+    }
+
+    /// Load the cursor with the given id from `font`
+    fn load_cursor(conn: &Connection, font: Font, id: u16) -> Result<Cursor> {
+        let cid = conn.generate_id();
+        // https://github.com/mirror/libX11/blob/ff8706a5eae25b8bafce300527079f68a201d27f/src/Cursor.c#L34
+        conn.check_request(conn.send_request_checked(&CreateGlyphCursor {
+            cid,
+            source_font: font,
+            mask_font: font,
+            source_char: id,
+            mask_char: id + 1,
+            fore_red: 0,
+            fore_green: 0,
+            fore_blue: 0,
+            back_red: u16::MAX,
+            back_green: u16::MAX,
+            back_blue: u16::MAX,
+        }))?;
+
+        Ok(cid)
+    }
+
+    pub const fn normal(&self) -> Cursor {
+        self.normal
+    }
+}