feat: show my cursor (#12745)

Signed-off-by: fufesou <linlong1266@gmail.com>

src/common.rs

@@ -2040,6 +2040,22 @@ pub async fn get_ipv6_socket() -> Option<(Arc<UdpSocket>, bytes::Bytes)> {
     None
 }
 
+// The color is the same to `str2color()` in flutter.
+pub fn str2color(s: &str, alpha: u8) -> u32 {
+    let bytes = s.as_bytes();
+    // dart code `160 << 16 + 114 << 8 + 91` results `0`.
+    let mut hash: u32 = 0;
+    for &byte in bytes {
+        let code = byte as u32;
+        hash = code.wrapping_add((hash << 5).wrapping_sub(hash));
+    }
+
+    hash = hash % 16777216;
+    let rgb = hash & 0xFF7FFF;
+
+    (alpha as u32) << 24 | rgb
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;