anvil: clamp input to current output instead of full hd

anvil/src/input_handler.rs

@@ -92,10 +92,14 @@ impl AnvilState {
         let mut location = self.pointer_location.borrow_mut();
         location.0 += x as f64;
         location.1 += y as f64;
+        
+        #[cfg(feature = "udev")]
+        {
             // clamp to screen limits
-        // this event is never generated by winit so self.screen_size is relevant
-        location.0 = (location.0).max(0.0).min(self.screen_size.0 as f64);
-        location.1 = (location.1).max(0.0).min(self.screen_size.1 as f64);
+            // this event is never generated by winit
+            *location = self.clamp_coords(*location);
+        }
+
         let under = self
             .window_map
             .borrow()
@@ -110,8 +114,11 @@ impl AnvilState {
             {
                 if self.session.is_some() {
                     // we are started on a tty
-                    let (ux, uy) = evt.position_transformed(self.screen_size);
-                    (ux as f64, uy as f64)
+                    let x = self.pointer_location.borrow().0;
+                    let screen_size = self.current_output_size(x);
+                    // monitor coordinates
+                    let (ux, uy) = evt.position_transformed(screen_size);
+                    ((ux + self.current_output_offset(x)) as f64, uy as f64)
                 } else {
                     // we are started in winit
                     evt.position()
@@ -128,6 +135,67 @@ impl AnvilState {
         self.pointer.motion((x, y), under, serial, evt.time());
     }
 
+    #[cfg(feature = "udev")]
+    fn clamp_coords(&self, pos: (f64, f64)) -> (f64, f64) {
+        let output_map = self.output_map
+            .as_ref().unwrap();
+        let outputs = output_map.borrow();
+            
+        if outputs.len() == 0 {
+            return pos;
+        }
+
+        let (mut x, mut y) = pos;
+        // max_x is the sum of the width of all outputs
+        let max_x = outputs
+            .iter()
+            .fold(0u32, |acc, output| acc + output.size.0);
+        x = x.max(0.0).min(max_x as f64);
+
+        // max y depends on the current output
+        let max_y = self.current_output_size(x).1;
+        y = y.max(0.0).min(max_y as f64);
+
+        (x, y)
+    }
+    
+    #[cfg(feature = "udev")]
+    fn current_output_idx(&self, x: f64) -> usize {
+        let output_map = self.output_map.as_ref().unwrap();
+        let outputs = output_map.borrow();
+
+        outputs
+            .iter()
+            // map each output to their x position
+            .scan(0u32, |acc, output| {
+                let curr_x = *acc;
+                *acc += output.size.0;
+                Some(curr_x)
+            })
+            // get an index
+            .enumerate()
+            // find the first one with a greater x
+            .find(|(_idx, x_pos)| *x_pos as f64 > x)
+            // the previous output is the one we are on
+            .map(|(idx, _)| idx - 1)
+            .unwrap_or(outputs.len() - 1)
+    }
+    #[cfg(feature = "udev")]
+    fn current_output_size(&self, x: f64) -> (u32, u32) {
+        let output_map = self.output_map.as_ref().unwrap();
+        let outputs = output_map.borrow();
+        outputs[self.current_output_idx(x)].size
+    }
+    #[cfg(feature = "udev")]
+    fn current_output_offset(&self, x: f64) -> u32 {
+        let output_map = self.output_map.as_ref().unwrap();
+        let outputs = output_map.borrow();
+        outputs
+            .iter()
+            .take(self.current_output_idx(x))
+            .fold(0u32, |acc, output| acc + output.size.0)
+    }
+
     fn on_pointer_button<B: InputBackend>(&mut self, evt: B::PointerButtonEvent) {
         let serial = SCOUNTER.next_serial();
         let button = match evt.button() {

anvil/src/state.rs

@@ -27,7 +27,7 @@ use smithay::{
 #[cfg(feature = "udev")]
 use smithay::backend::session::Session;
 
-use crate::{buffer_utils::BufferUtils, shell::init_shell};
+use crate::{buffer_utils::BufferUtils, shell::init_shell, udev::MyOutput};
 
 pub struct AnvilState {
     pub socket_name: String,
@@ -43,7 +43,8 @@ pub struct AnvilState {
     pub keyboard: KeyboardHandle,
     pub pointer_location: Rc<RefCell<(f64, f64)>>,
     pub cursor_status: Arc<Mutex<CursorImageStatus>>,
-    pub screen_size: (u32, u32),
+    #[cfg(feature = "udev")]
+    pub output_map: Option<Rc<RefCell<Vec<MyOutput>>>>,
     pub seat_name: String,
     #[cfg(feature = "udev")]
     pub session: Option<AutoSession>,
@@ -58,6 +59,8 @@ impl AnvilState {
         buffer_utils: BufferUtils,
         #[cfg(feature = "udev")] session: Option<AutoSession>,
         #[cfg(not(feature = "udev"))] _session: Option<()>,
+        #[cfg(feature = "udev")] output_map: Option<Rc<RefCell<Vec<MyOutput>>>>,
+        #[cfg(not(feature = "udev"))] _output_map: Option<()>,
         log: slog::Logger,
     ) -> AnvilState {
         // init the wayland connection
@@ -162,7 +165,8 @@ impl AnvilState {
             keyboard,
             cursor_status,
             pointer_location: Rc::new(RefCell::new((0.0, 0.0))),
-            screen_size: (1920, 1080),
+            #[cfg(feature = "udev")]
+            output_map,
             seat_name,
             #[cfg(feature = "udev")]
             session,

anvil/src/udev.rs

@@ -113,6 +113,8 @@ pub fn run_udev(
     #[cfg(not(feature = "egl"))]
     let buffer_utils = BufferUtils::new(log.clone());
     
+    let output_map = Rc::new(RefCell::new(Vec::new()));
+
     /*
      * Initialize session
      */
@@ -127,6 +129,7 @@ pub fn run_udev(
         event_loop.handle(),
         buffer_utils,
         Some(session),
+        Some(output_map.clone()),
         log.clone(),
     );
 
@@ -138,8 +141,6 @@ pub fn run_udev(
     let bytes = include_bytes!("../resources/cursor2.rgba");
     let udev_backend = UdevBackend::new(state.seat_name.clone(), log.clone()).map_err(|_| ())?;
 
-    let output_map = Rc::new(RefCell::new(Vec::new()));
-
     let mut udev_handler = UdevHandlerImpl {
         compositor_token: state.ctoken,
         #[cfg(feature = "egl")]
@@ -227,10 +228,10 @@ pub fn run_udev(
     Ok(())
 }
 
-struct MyOutput {
-    device_id: dev_t,
-    crtc: crtc::Handle,
-    size: (u32, u32),
+pub struct MyOutput {
+    pub device_id: dev_t,
+    pub crtc: crtc::Handle,
+    pub size: (u32, u32),
     _wl: Output,
     global: Option<Global<wl_output::WlOutput>>,
 }

anvil/src/winit.rs

@@ -58,6 +58,7 @@ pub fn run_winit(
         event_loop.handle(),
         buffer_utils,
         None,
+        None,
         log.clone(),
     );