feat(pointer): virtio tablet as 2nd input dev (driver per-instance VAs, abs/btn decode), input server serves 2 devices on one notif; display software cursor, bar click switches window, presses/releases to front window in its px; k-ui hit-tests (press focuses, release on same presses, field only focuses)

crates/types/src/input.rs

@@ -8,6 +8,21 @@ pub const SUBSCRIBE: usize = 2;
 pub mod event {
     pub const KEY_DOWN: usize = 1;
     pub const KEY_UP: usize = 2;
+    /// A pointer event: word 1 the button (0 left, 1 right) or finger,
+    /// word 2 `x | y << 16`. From the input server, a fraction of the
+    /// screen (0 to 65535 each way); from the display to a window, that
+    /// window's pixels.
+    pub const POINTER_DOWN: usize = 3;
+    pub const POINTER_MOVE: usize = 4;
+    pub const POINTER_UP: usize = 5;
+
+    pub const fn pack_point(x: u16, y: u16) -> usize {
+        x as usize | (y as usize) << 16
+    }
+
+    pub const fn unpack_point(word: usize) -> (u16, u16) {
+        (word as u16, (word >> 16) as u16)
+    }
     /// A function key: `extra` is its number (F1 is 1).
     pub const FUNCTION_KEY: usize = 10;
 }