Merge pull request #314 from PolyMeilex/tablet

Graphics tablet support

Cargo.toml

@@ -21,7 +21,7 @@ drm-fourcc = "^2.1.1"
 drm = { version = "0.4.0", optional = true }
 drm-ffi = { version = "0.1.0", optional = true }
 gbm = { version = "0.6.0", optional = true, default-features = false, features = ["drm-support"] }
-input = { version = "0.5", default-features = false, optional = true }
+input = { version = "0.5", default-features = false, features=["libinput_1_14"], optional = true }
 image = { version = "0.23.14", default-features = false, optional = true }
 lazy_static = "1"
 libc = "0.2.70"
@@ -57,7 +57,7 @@ backend_gbm = ["gbm"]
 backend_egl = ["gl_generator"]
 backend_libinput = ["input"]
 backend_session = []
-backend_udev = ["udev"]
+backend_udev = ["udev", "input/udev"]
 backend_session_logind = ["dbus", "backend_session", "pkg-config"]
 backend_session_elogind = ["backend_session_logind"]
 backend_session_libseat = ["backend_session", "libseat"]

anvil/src/input_handler.rs

@@ -8,13 +8,15 @@ use crate::AnvilState;
 
 use smithay::{
     backend::input::{
-        self, Event, InputBackend, InputEvent, KeyState, KeyboardKeyEvent, PointerAxisEvent,
-        PointerButtonEvent,
+        self, Device, DeviceCapability, Event, InputBackend, InputEvent, KeyState, KeyboardKeyEvent,
+        PointerAxisEvent, PointerButtonEvent, ProximityState, TabletToolButtonEvent, TabletToolEvent,
+        TabletToolProximityEvent, TabletToolTipEvent, TabletToolTipState,
     },
     reexports::wayland_server::protocol::wl_pointer,
     wayland::{
         output::Mode,
         seat::{keysyms as xkb, AxisFrame, Keysym, ModifiersState},
+        tablet_manager::{TabletDescriptor, TabletSeatTrait},
         SERIAL_COUNTER as SCOUNTER,
     },
 };
@@ -81,7 +83,7 @@ impl<Backend> AnvilState<Backend> {
             input::MouseButton::Other(b) => b as u32,
         };
         let state = match evt.state() {
-            input::MouseButtonState::Pressed => {
+            input::ButtonState::Pressed => {
                 // change the keyboard focus unless the pointer is grabbed
                 if !self.pointer.is_grabbed() {
                     let under = self
@@ -93,7 +95,7 @@ impl<Backend> AnvilState<Backend> {
                 }
                 wl_pointer::ButtonState::Pressed
             }
-            input::MouseButtonState::Released => wl_pointer::ButtonState::Released,
+            input::ButtonState::Released => wl_pointer::ButtonState::Released,
         };
         self.pointer.button(button, state, serial, evt.time());
     }
@@ -238,6 +240,29 @@ impl AnvilState<UdevData> {
             InputEvent::PointerMotion { event, .. } => self.on_pointer_move::<B>(event),
             InputEvent::PointerButton { event, .. } => self.on_pointer_button::<B>(event),
             InputEvent::PointerAxis { event, .. } => self.on_pointer_axis::<B>(event),
+            InputEvent::TabletToolAxis { event, .. } => self.on_tablet_tool_axis::<B>(event),
+            InputEvent::TabletToolProximity { event, .. } => self.on_tablet_tool_proximity::<B>(event),
+            InputEvent::TabletToolTip { event, .. } => self.on_tablet_tool_tip::<B>(event),
+            InputEvent::TabletToolButton { event, .. } => self.on_tablet_button::<B>(event),
+            InputEvent::DeviceAdded { device } => {
+                if device.has_capability(DeviceCapability::TabletTool) {
+                    self.seat
+                        .tablet_seat()
+                        .add_tablet(&TabletDescriptor::from(&device));
+                }
+            }
+            InputEvent::DeviceRemoved { device } => {
+                if device.has_capability(DeviceCapability::TabletTool) {
+                    let tablet_seat = self.seat.tablet_seat();
+
+                    tablet_seat.remove_tablet(&TabletDescriptor::from(&device));
+
+                    // If there are no tablets in seat we can remove all tools
+                    if tablet_seat.count_tablets() == 0 {
+                        tablet_seat.clear_tools();
+                    }
+                }
+            }
             _ => {
                 // other events are not handled in anvil (yet)
             }
@@ -259,6 +284,127 @@ impl AnvilState<UdevData> {
             .motion(self.pointer_location, under, serial, evt.time());
     }
 
+    fn on_tablet_tool_axis<B: InputBackend>(&mut self, evt: B::TabletToolAxisEvent) {
+        let output_map = self.output_map.borrow();
+        let pointer_location = &mut self.pointer_location;
+        let tablet_seat = self.seat.tablet_seat();
+        let window_map = self.window_map.borrow();
+
+        output_map
+            .with_primary(|_, rect| {
+                pointer_location.0 = evt.x_transformed(rect.width as u32) + rect.x as f64;
+                pointer_location.1 = evt.y_transformed(rect.height as u32) + rect.y as f64;
+
+                let under = window_map.get_surface_under(*pointer_location);
+                let tablet = tablet_seat.get_tablet(&TabletDescriptor::from(&evt.device()));
+                let tool = tablet_seat.get_tool(&evt.tool());
+
+                if let (Some(tablet), Some(tool)) = (tablet, tool) {
+                    if evt.pressure_has_changed() {
+                        tool.pressure(evt.pressure());
+                    }
+                    if evt.distance_has_changed() {
+                        tool.distance(evt.distance());
+                    }
+                    if evt.tilt_has_changed() {
+                        tool.tilt(evt.tilt());
+                    }
+                    if evt.slider_has_changed() {
+                        tool.slider_position(evt.slider_position());
+                    }
+                    if evt.rotation_has_changed() {
+                        tool.rotation(evt.rotation());
+                    }
+                    if evt.wheel_has_changed() {
+                        tool.wheel(evt.wheel_delta(), evt.wheel_delta_discrete());
+                    }
+
+                    tool.motion(
+                        *pointer_location,
+                        under,
+                        &tablet,
+                        SCOUNTER.next_serial(),
+                        evt.time(),
+                    );
+                }
+            })
+            .unwrap();
+    }
+
+    fn on_tablet_tool_proximity<B: InputBackend>(&mut self, evt: B::TabletToolProximityEvent) {
+        let output_map = self.output_map.borrow();
+        let pointer_location = &mut self.pointer_location;
+        let tablet_seat = self.seat.tablet_seat();
+        let window_map = self.window_map.borrow();
+
+        output_map
+            .with_primary(|_, rect| {
+                let tool = evt.tool();
+                tablet_seat.add_tool(&tool);
+
+                pointer_location.0 = evt.x_transformed(rect.width as u32) + rect.x as f64;
+                pointer_location.1 = evt.y_transformed(rect.height as u32) + rect.y as f64;
+
+                let under = window_map.get_surface_under(*pointer_location);
+                let tablet = tablet_seat.get_tablet(&TabletDescriptor::from(&evt.device()));
+                let tool = tablet_seat.get_tool(&tool);
+
+                if let (Some(under), Some(tablet), Some(tool)) = (under, tablet, tool) {
+                    match evt.state() {
+                        ProximityState::In => tool.proximity_in(
+                            *pointer_location,
+                            under,
+                            &tablet,
+                            SCOUNTER.next_serial(),
+                            evt.time(),
+                        ),
+                        ProximityState::Out => tool.proximity_out(evt.time()),
+                    }
+                }
+            })
+            .unwrap();
+    }
+
+    fn on_tablet_tool_tip<B: InputBackend>(&mut self, evt: B::TabletToolTipEvent) {
+        let tool = self.seat.tablet_seat().get_tool(&evt.tool());
+
+        if let Some(tool) = tool {
+            match evt.tip_state() {
+                TabletToolTipState::Down => {
+                    tool.tip_down(SCOUNTER.next_serial(), evt.time());
+
+                    // change the keyboard focus unless the pointer is grabbed
+                    if !self.pointer.is_grabbed() {
+                        let under = self
+                            .window_map
+                            .borrow_mut()
+                            .get_surface_and_bring_to_top(self.pointer_location);
+
+                        let serial = SCOUNTER.next_serial();
+                        self.keyboard
+                            .set_focus(under.as_ref().map(|&(ref s, _)| s), serial);
+                    }
+                }
+                TabletToolTipState::Up => {
+                    tool.tip_up(evt.time());
+                }
+            }
+        }
+    }
+
+    fn on_tablet_button<B: InputBackend>(&mut self, evt: B::TabletToolButtonEvent) {
+        let tool = self.seat.tablet_seat().get_tool(&evt.tool());
+
+        if let Some(tool) = tool {
+            tool.button(
+                evt.button(),
+                evt.button_state(),
+                SCOUNTER.next_serial(),
+                evt.time(),
+            );
+        }
+    }
+
     fn clamp_coords(&self, pos: (f64, f64)) -> (f64, f64) {
         if self.output_map.borrow().is_empty() {
             return pos;

anvil/src/state.rs

@@ -16,6 +16,7 @@ use smithay::{
         data_device::{default_action_chooser, init_data_device, set_data_device_focus, DataDeviceEvent},
         seat::{CursorImageStatus, KeyboardHandle, PointerHandle, Seat, XkbConfig},
         shm::init_shm_global,
+        tablet_manager::{init_tablet_manager_global, TabletSeatTrait},
     },
 };
 
@@ -41,6 +42,7 @@ pub struct AnvilState<BackendData> {
     pub pointer_location: (f64, f64),
     pub cursor_status: Arc<Mutex<CursorImageStatus>>,
     pub seat_name: String,
+    pub seat: Seat,
     pub start_time: std::time::Instant,
     // things we must keep alive
     #[cfg(feature = "xwayland")]
@@ -121,6 +123,14 @@ impl<BackendData: Backend + 'static> AnvilState<BackendData> {
             *cursor_status2.lock().unwrap() = new_status
         });
 
+        init_tablet_manager_global(&mut display.borrow_mut());
+
+        let cursor_status3 = cursor_status.clone();
+        seat.tablet_seat().on_cursor_surface(move |_tool, new_status| {
+            // TODO: tablet tools should have their own cursors
+            *cursor_status3.lock().unwrap() = new_status;
+        });
+
         let keyboard = seat
             .add_keyboard(XkbConfig::default(), 200, 25, |seat, focus| {
                 set_data_device_focus(seat, focus.and_then(|s| s.as_ref().client()))
@@ -159,6 +169,7 @@ impl<BackendData: Backend + 'static> AnvilState<BackendData> {
             cursor_status,
             pointer_location: (0.0, 0.0),
             seat_name,
+            seat,
             start_time: std::time::Instant::now(),
             #[cfg(feature = "xwayland")]
             xwayland,

src/backend/input.rs

@@ -1,6 +1,13 @@
 //! Common traits for input backends to receive input from.
 
-use std::error::Error;
+use std::{error::Error, path::PathBuf};
+
+mod tablet;
+
+pub use tablet::{
+    ProximityState, TabletToolAxisEvent, TabletToolButtonEvent, TabletToolCapabilitys, TabletToolDescriptor,
+    TabletToolEvent, TabletToolProximityEvent, TabletToolTipEvent, TabletToolTipState, TabletToolType,
+};
 
 /// Trait for generic functions every input device does provide
 pub trait Device: PartialEq + Eq + std::hash::Hash {
@@ -12,6 +19,14 @@ pub trait Device: PartialEq + Eq + std::hash::Hash {
     fn name(&self) -> String;
     /// Test if this device has a specific capability
     fn has_capability(&self, capability: DeviceCapability) -> bool;
+
+    /// Returns device USB (product,vendor) id
+    fn usb_id(&self) -> Option<(u32, u32)>;
+
+    /// Returns the syspath of the device.
+    ///
+    /// The path is an absolute path and includes the sys mount point.
+    fn syspath(&self) -> Option<PathBuf>;
 }
 
 /// Set of input types a device may provide
@@ -105,9 +120,9 @@ pub enum MouseButton {
     Other(u8),
 }
 
-/// State of a button on a mouse. Either pressed or released
+/// State of a button on a pointer device, like mouse or tablet tool. Either pressed or released
 #[derive(Debug, PartialEq, Eq, Clone, Copy)]
-pub enum MouseButtonState {
+pub enum ButtonState {
     /// Button is released
     Released,
     /// Button is pressed
@@ -119,7 +134,7 @@ pub trait PointerButtonEvent<B: InputBackend>: Event<B> {
     /// Pressed button of the event
     fn button(&self) -> MouseButton;
     /// State of the button
-    fn state(&self) -> MouseButtonState;
+    fn state(&self) -> ButtonState;
 }
 
 impl<B: InputBackend> PointerButtonEvent<B> for UnusedEvent {
@@ -127,7 +142,7 @@ impl<B: InputBackend> PointerButtonEvent<B> for UnusedEvent {
         match *self {}
     }
 
-    fn state(&self) -> MouseButtonState {
+    fn state(&self) -> ButtonState {
         match *self {}
     }
 }
@@ -481,6 +496,14 @@ pub trait InputBackend: Sized {
     type TouchCancelEvent: TouchCancelEvent<Self>;
     /// Type representing touch frame events
     type TouchFrameEvent: TouchFrameEvent<Self>;
+    /// Type representing axis events on tablet devices
+    type TabletToolAxisEvent: TabletToolAxisEvent<Self>;
+    /// Type representing proximity events on tablet devices
+    type TabletToolProximityEvent: TabletToolProximityEvent<Self>;
+    /// Type representing tip events on tablet devices
+    type TabletToolTipEvent: TabletToolTipEvent<Self>;
+    /// Type representing button events on tablet tool devices
+    type TabletToolButtonEvent: TabletToolButtonEvent<Self>;
 
     /// Special events that are custom to this backend
     type SpecialEvent;
@@ -557,6 +580,31 @@ pub enum InputEvent<B: InputBackend> {
         /// The touch frame event
         event: B::TouchFrameEvent,
     },
+
+    /// A tablet tool axis was emited
+    TabletToolAxis {
+        /// The tablet tool axis event
+        event: B::TabletToolAxisEvent,
+    },
+
+    /// A tablet tool proximity was emited
+    TabletToolProximity {
+        /// The tablet tool proximity  event
+        event: B::TabletToolProximityEvent,
+    },
+
+    /// A tablet tool tip event was emited
+    TabletToolTip {
+        /// The tablet tool axis event
+        event: B::TabletToolTipEvent,
+    },
+
+    /// A tablet tool button was pressed or released
+    TabletToolButton {
+        /// The pointer button event
+        event: B::TabletToolButtonEvent,
+    },
+
     /// Special event specific of this backend
     Special(B::SpecialEvent),
 }

src/backend/input/tablet.rs

@@ -0,0 +1,366 @@
+use super::{ButtonState, Event, InputBackend, UnusedEvent};
+use bitflags::bitflags;
+
+/// Description of physical tablet tool
+#[derive(Debug, Clone, Hash, Eq, PartialEq)]
+pub struct TabletToolDescriptor {
+    /// The tool type is the high-level type of the tool and usually decides the interaction expected from this tool.
+    pub tool_type: TabletToolType,
+    /// Unique hardware serial number of the tool
+    pub hardware_serial: u64,
+    /// Hardware id in Wacom’s format
+    pub hardware_id_wacom: u64,
+    /// Tool capability
+    /// Notifies the client of any capabilities of this tool, beyond the main set of x/y axes and tip up/down detection
+    pub capabilitys: TabletToolCapabilitys,
+}
+
+/// Describes the physical type of a tool. The physical type of a tool generally defines its base usage.
+#[derive(Debug, Clone, Copy, Hash, Eq, PartialEq)]
+pub enum TabletToolType {
+    /// A generic pen.
+    Pen,
+    /// Eraser
+    Eraser,
+    /// A paintbrush-like tool.
+    Brush,
+    /// Physical drawing tool, e.g. Wacom Inking Pen
+    Pencil,
+    /// An airbrush-like tool.
+    Airbrush,
+    /// A mouse bound to the tablet.
+    Mouse,
+    /// A mouse tool with a lens.
+    Lens,
+    /// A rotary device with positional and rotation data.  
+    Totem,
+}
+
+bitflags! {
+    /// Describes extra capabilities on a tablet.
+    ///
+    /// Any tool must provide x and y values, extra axes are device-specific.
+    pub struct TabletToolCapabilitys: u32 {
+        /// Tilt axes
+        const TILT = 1;
+        /// Pressure axis
+        const PRESSURE = 2;
+        /// Distance axis
+        const DISTANCE = 4;
+        /// Z-rotation axis
+        const ROTATION = 16;
+        /// Slider axis
+        const SLIDER = 32;
+        /// Wheel axis
+        const WHEEL = 64;
+    }
+}
+
+/// Tablet tool event
+pub trait TabletToolEvent<B: InputBackend> {
+    /// Get tablet tool that caused this event
+    fn tool(&self) -> TabletToolDescriptor;
+
+    /// Delta between the last and new pointer device position interpreted as pixel movement
+    fn delta(&self) -> (f64, f64) {
+        (self.delta_x(), self.delta_y())
+    }
+
+    /// Tool position in the device's native coordinate space
+    fn position(&self) -> (f64, f64) {
+        (self.x(), self.y())
+    }
+
+    /// Tool position converted into the target coordinate space.
+    fn position_transformed(&self, coordinate_space: (u32, u32)) -> (f64, f64) {
+        (
+            self.x_transformed(coordinate_space.0),
+            self.y_transformed(coordinate_space.1),
+        )
+    }
+
+    /// Returns the current tilt along the (X,Y) axis of the tablet's current logical
+    /// orientation, in degrees off the tablet's z axis.
+    ///
+    /// That is, if the tool is perfectly orthogonal to the tablet, the tilt angle is 0.
+    /// When the top tilts towards the logical top/left of the tablet, the x/y tilt
+    /// angles are negative, if the top tilts towards the logical bottom/right of the
+    /// tablet, the x/y tilt angles are positive.
+    ///
+    /// If this axis does not exist on the current tool, this function returns (0,0).
+    fn tilt(&self) -> (f64, f64) {
+        (self.tilt_x(), self.tilt_y())
+    }
+
+    /// Check if the tilt was updated in this event.
+    fn tilt_has_changed(&self) -> bool {
+        self.tilt_x_has_changed() || self.tilt_y_has_changed()
+    }
+
+    /// Delta on the x axis between the last and new pointer device position interpreted as pixel movement
+    fn delta_x(&self) -> f64;
+    /// Delta on the y axis between the last and new pointer device position interpreted as pixel movement
+    fn delta_y(&self) -> f64;
+
+    /// Returns the x coordinate of the tablet tool, in mm from the top left corner of the tablet in its current logical orientation.
+    fn x(&self) -> f64;
+    /// Returns the y coordinate of the tablet tool, in mm from the top left corner of the tablet in its current logical orientation.
+    fn y(&self) -> f64;
+
+    /// Return the current absolute X coordinate of the tablet tool event, transformed to screen coordinates.
+    fn x_transformed(&self, width: u32) -> f64;
+    /// Return the current absolute Y coordinate of the tablet tool event, transformed to screen coordinates.
+    fn y_transformed(&self, height: u32) -> f64;
+
+    /// Returns the current distance from the tablet's sensor, normalized to the range [0, 1]
+    ///
+    /// If this axis does not exist on the current tool, this function returns 0.
+    fn distance(&self) -> f64;
+
+    /// Check if the distance axis was updated in this event.
+    fn distance_has_changed(&self) -> bool;
+
+    /// Returns the current pressure being applied on the tool in use, normalized to the range [0, 1].
+    ///
+    /// If this axis does not exist on the current tool, this function returns 0.
+    fn pressure(&self) -> f64;
+
+    /// Check if the pressure axis was updated in this event.
+    fn pressure_has_changed(&self) -> bool;
+
+    /// Returns the current position of the slider on the tool, normalized to the range
+    /// [-1, 1].
+    ///
+    /// The logical zero is the neutral position of the slider, or the logical center of
+    /// the axis. This axis is available on e.g. the Wacom Airbrush.
+    ///
+    /// If this axis does not exist on the current tool, this function returns 0.
+    fn slider_position(&self) -> f64;
+
+    /// Check if the slider axis was updated in this event.
+    fn slider_has_changed(&self) -> bool;
+
+    /// Returns the current tilt along the X axis of the tablet's current logical
+    /// orientation, in degrees off the tablet's z axis.
+    ///
+    /// That is, if the tool is perfectly orthogonal to the tablet, the tilt angle is 0.
+    /// When the top tilts towards the logical top/left of the tablet, the x/y tilt
+    /// angles are negative, if the top tilts towards the logical bottom/right of the
+    /// tablet, the x/y tilt angles are positive.
+    ///
+    /// If this axis does not exist on the current tool, this function returns 0.
+    fn tilt_x(&self) -> f64;
+
+    /// Check if the tilt x axis was updated in this event.
+    fn tilt_x_has_changed(&self) -> bool;
+
+    /// Returns the current tilt along the Y axis of the tablet's current logical
+    /// orientation, in degrees off the tablet's z axis.
+    ///
+    /// That is, if the tool is perfectly orthogonal to the tablet, the tilt angle is 0.
+    /// When the top tilts towards the logical top/left of the tablet, the x/y tilt
+    /// angles are negative, if the top tilts towards the logical bottom/right of the
+    /// tablet, the x/y tilt angles are positive.
+    ///
+    /// If this axis does not exist on the current tool, this function returns 0.
+    fn tilt_y(&self) -> f64;
+
+    /// Check if the tilt y axis was updated in this event.
+    fn tilt_y_has_changed(&self) -> bool;
+
+    /// Returns the current z rotation of the tool in degrees, clockwise from the tool's logical neutral position.
+    ///
+    /// For tools of type Mouse and Lens the logical neutral position is pointing to the current logical north of the tablet.
+    /// For tools of type Brush, the logical neutral position is with the buttons pointing up.
+    ///
+    /// If this axis does not exist on the current tool, this function returns 0.
+    fn rotation(&self) -> f64;
+
+    /// Check if the z-rotation axis was updated in this event.
+    fn rotation_has_changed(&self) -> bool;
+
+    /// Return the delta for the wheel in degrees.
+    fn wheel_delta(&self) -> f64;
+    /// Return the delta for the wheel in discrete steps (e.g. wheel clicks).
+    fn wheel_delta_discrete(&self) -> i32;
+    /// Check if the wheel axis was updated in this event.
+    fn wheel_has_changed(&self) -> bool;
+}
+
+impl<B: InputBackend> TabletToolEvent<B> for UnusedEvent {
+    fn tool(&self) -> TabletToolDescriptor {
+        match *self {}
+    }
+    fn delta_x(&self) -> f64 {
+        match *self {}
+    }
+    fn delta_y(&self) -> f64 {
+        match *self {}
+    }
+    fn x(&self) -> f64 {
+        match *self {}
+    }
+    fn y(&self) -> f64 {
+        match *self {}
+    }
+    fn x_transformed(&self, _width: u32) -> f64 {
+        match *self {}
+    }
+    fn y_transformed(&self, _height: u32) -> f64 {
+        match *self {}
+    }
+    fn distance(&self) -> f64 {
+        match *self {}
+    }
+    fn distance_has_changed(&self) -> bool {
+        match *self {}
+    }
+    fn pressure(&self) -> f64 {
+        match *self {}
+    }
+    fn pressure_has_changed(&self) -> bool {
+        match *self {}
+    }
+    fn slider_position(&self) -> f64 {
+        match *self {}
+    }
+    fn slider_has_changed(&self) -> bool {
+        match *self {}
+    }
+    fn tilt_x(&self) -> f64 {
+        match *self {}
+    }
+    fn tilt_x_has_changed(&self) -> bool {
+        match *self {}
+    }
+    fn tilt_y(&self) -> f64 {
+        match *self {}
+    }
+    fn tilt_y_has_changed(&self) -> bool {
+        match *self {}
+    }
+    fn rotation(&self) -> f64 {
+        match *self {}
+    }
+    fn rotation_has_changed(&self) -> bool {
+        match *self {}
+    }
+    fn wheel_delta(&self) -> f64 {
+        match *self {}
+    }
+    fn wheel_delta_discrete(&self) -> i32 {
+        match *self {}
+    }
+    fn wheel_has_changed(&self) -> bool {
+        match *self {}
+    }
+}
+
+/// Trait for axis tablet tool events.
+pub trait TabletToolAxisEvent<B: InputBackend>: TabletToolEvent<B> + Event<B> {}
+
+impl<B: InputBackend> TabletToolAxisEvent<B> for UnusedEvent {}
+
+/// The state of proximity for a tool on a device.
+///
+/// The proximity of a tool is a binary state signalling whether the tool is within a
+/// detectable distance of the tablet device. A tool that is out of proximity cannot
+/// generate events.
+///
+/// On some hardware a tool goes out of proximity when it ceases to touch the surface. On
+/// other hardware, the tool is still detectable within a short distance (a few cm) off
+/// the surface.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub enum ProximityState {
+    /// Out of proximity
+    Out,
+    /// In proximity
+    In,
+}
+
+/// Trait for tablet tool proximity events.
+pub trait TabletToolProximityEvent<B: InputBackend>: TabletToolEvent<B> + Event<B> {
+    /// Returns the new proximity state of a tool from a proximity event.
+    ///
+    /// Used to check whether or not a tool came in or out of proximity during an
+    /// `TabletToolProximityEvent`.
+    ///
+    /// See [Handling of proximity events](https://wayland.freedesktop.org/libinput/doc/latest/tablet-support.html#tablet-fake-proximity)
+    /// for recommendations on proximity handling.
+    fn state(&self) -> ProximityState;
+}
+
+impl<B: InputBackend> TabletToolProximityEvent<B> for UnusedEvent {
+    fn state(&self) -> ProximityState {
+        match *self {}
+    }
+}
+
+/// The tip contact state for a tool on a device.
+///
+/// The tip contact state of a tool is a binary state signalling whether the tool is
+/// touching the surface of the tablet device.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub enum TabletToolTipState {
+    /// Not touching the surface
+    Up,
+    /// Touching the surface
+    Down,
+}
+
+/// Signals that a tool has come in contact with the surface of a device with the
+/// `DeviceCapability::TabletTool` capability.
+///
+/// On devices without distance proximity detection, the `TabletToolTipEvent` is sent
+/// immediately after `TabletToolProximityEvent` for the tip down event, and
+/// immediately before for the tip up event.
+///
+/// The decision when a tip touches the surface is device-dependent and may be
+/// derived from pressure data or other means. If the tip state is changed by axes
+/// changing state, the `TabletToolTipEvent` includes the changed axes and no
+/// additional axis event is sent for this state change. In other words, a caller
+/// must look at both `TabletToolAxisEvent` and `TabletToolTipEvent` events to know
+/// the current state of the axes.
+///
+/// If a button state change occurs at the same time as a tip state change, the order
+/// of events is device-dependent.
+pub trait TabletToolTipEvent<B: InputBackend>: TabletToolEvent<B> + Event<B> {
+    /// Returns the new tip state of a tool from a tip event.
+    ///
+    /// Used to check whether or not a tool came in contact with the tablet surface or
+    /// left contact with the tablet surface during an `TabletToolTipEvent`.
+    fn tip_state(&self) -> TabletToolTipState;
+}
+
+impl<B: InputBackend> TabletToolTipEvent<B> for UnusedEvent {
+    fn tip_state(&self) -> TabletToolTipState {
+        match *self {}
+    }
+}
+
+/// Signals that a tool has changed a logical button state on a device with the DeviceCapability::TabletTool capability.
+pub trait TabletToolButtonEvent<B: InputBackend>: TabletToolEvent<B> + Event<B> {
+    /// Return the button that triggered this event.
+    fn button(&self) -> u32;
+
+    /// For the button of a TabletToolButtonEvent,
+    /// return the total number of buttons pressed on all devices on the associated seat after the the event was triggered.
+    fn seat_button_count(&self) -> u32;
+
+    /// Return the button state of the event.
+    fn button_state(&self) -> ButtonState;
+}
+
+impl<B: InputBackend> TabletToolButtonEvent<B> for UnusedEvent {
+    fn button(&self) -> u32 {
+        match *self {}
+    }
+
+    fn seat_button_count(&self) -> u32 {
+        match *self {}
+    }
+
+    fn button_state(&self) -> ButtonState {
+        match *self {}
+    }
+}

src/backend/libinput.rs

@@ -14,12 +14,15 @@ use std::path::Path;
 use std::{
     io::Error as IoError,
     os::unix::io::{AsRawFd, RawFd},
+    path::PathBuf,
 };
 
 use calloop::{EventSource, Interest, Mode, Poll, PostAction, Readiness, Token, TokenFactory};
 
 use slog::{info, o};
 
+mod tablet;
+
 // No idea if this is the same across unix platforms
 // Lets make this linux exclusive for now, once someone tries to build it for
 // any BSD-like system, they can verify if this is right and make a PR to change this.
@@ -93,6 +96,21 @@ impl backend::Device for libinput::Device {
     fn has_capability(&self, capability: backend::DeviceCapability) -> bool {
         libinput::Device::has_capability(self, capability.into())
     }
+
+    fn usb_id(&self) -> Option<(u32, u32)> {
+        Some((
+            libinput::Device::id_product(self),
+            libinput::Device::id_vendor(self),
+        ))
+    }
+
+    fn syspath(&self) -> Option<PathBuf> {
+        #[cfg(feature = "udev")]
+        return unsafe { libinput::Device::udev_device(self) }.map(|d| d.syspath().to_owned());
+
+        #[cfg(not(feature = "udev"))]
+        None
+    }
 }
 
 impl From<backend::DeviceCapability> for libinput::DeviceCapability {
@@ -179,7 +197,7 @@ impl backend::PointerButtonEvent<LibinputInputBackend> for event::pointer::Point
         }
     }
 
-    fn state(&self) -> backend::MouseButtonState {
+    fn state(&self) -> backend::ButtonState {
         self.button_state().into()
     }
 }
@@ -355,6 +373,10 @@ impl InputBackend for LibinputInputBackend {
     type TouchMotionEvent = event::touch::TouchMotionEvent;
     type TouchCancelEvent = event::touch::TouchCancelEvent;
     type TouchFrameEvent = event::touch::TouchFrameEvent;
+    type TabletToolAxisEvent = event::tablet_tool::TabletToolAxisEvent;
+    type TabletToolProximityEvent = event::tablet_tool::TabletToolProximityEvent;
+    type TabletToolTipEvent = event::tablet_tool::TabletToolTipEvent;
+    type TabletToolButtonEvent = event::tablet_tool::TabletToolButtonEvent;
 
     type SpecialEvent = backend::UnusedEvent;
 
@@ -420,6 +442,20 @@ impl InputBackend for LibinputInputBackend {
                         callback(InputEvent::PointerButton { event: button_event });
                     }
                 },
+                libinput::Event::Tablet(tablet_event) => match tablet_event {
+                    event::TabletToolEvent::Axis(event) => {
+                        callback(InputEvent::TabletToolAxis { event });
+                    }
+                    event::TabletToolEvent::Proximity(event) => {
+                        callback(InputEvent::TabletToolProximity { event });
+                    }
+                    event::TabletToolEvent::Tip(event) => {
+                        callback(InputEvent::TabletToolTip { event });
+                    }
+                    event::TabletToolEvent::Button(event) => {
+                        callback(InputEvent::TabletToolButton { event });
+                    }
+                },
                 _ => {} //FIXME: What to do with the rest.
             }
         }
@@ -465,11 +501,11 @@ impl From<event::pointer::AxisSource> for backend::AxisSource {
     }
 }
 
-impl From<event::pointer::ButtonState> for backend::MouseButtonState {
+impl From<event::pointer::ButtonState> for backend::ButtonState {
     fn from(libinput: event::pointer::ButtonState) -> Self {
         match libinput {
-            event::pointer::ButtonState::Pressed => backend::MouseButtonState::Pressed,
-            event::pointer::ButtonState::Released => backend::MouseButtonState::Released,
+            event::pointer::ButtonState::Pressed => backend::ButtonState::Pressed,
+            event::pointer::ButtonState::Released => backend::ButtonState::Released,
         }
     }
 }

src/backend/libinput/tablet.rs

@@ -0,0 +1,188 @@
+use crate::backend::input::{
+    self as backend, TabletToolCapabilitys, TabletToolDescriptor, TabletToolTipState, TabletToolType,
+};
+
+use input as libinput;
+use input::event;
+use input::event::{tablet_tool, EventTrait};
+
+use super::LibinputInputBackend;
+
+/// Marker for tablet tool events
+pub trait IsTabletEvent: tablet_tool::TabletToolEventTrait + EventTrait {}
+
+impl IsTabletEvent for tablet_tool::TabletToolAxisEvent {}
+impl IsTabletEvent for tablet_tool::TabletToolProximityEvent {}
+impl IsTabletEvent for tablet_tool::TabletToolTipEvent {}
+impl IsTabletEvent for tablet_tool::TabletToolButtonEvent {}
+
+impl<E> backend::Event<LibinputInputBackend> for E
+where
+    E: IsTabletEvent,
+{
+    fn time(&self) -> u32 {
+        tablet_tool::TabletToolEventTrait::time(self)
+    }
+
+    fn device(&self) -> libinput::Device {
+        event::EventTrait::device(self)
+    }
+}
+
+impl backend::TabletToolAxisEvent<LibinputInputBackend> for tablet_tool::TabletToolAxisEvent {}
+
+impl backend::TabletToolProximityEvent<LibinputInputBackend> for tablet_tool::TabletToolProximityEvent {
+    fn state(&self) -> backend::ProximityState {
+        match tablet_tool::TabletToolProximityEvent::proximity_state(self) {
+            tablet_tool::ProximityState::In => backend::ProximityState::In,
+            tablet_tool::ProximityState::Out => backend::ProximityState::Out,
+        }
+    }
+}
+
+impl backend::TabletToolTipEvent<LibinputInputBackend> for tablet_tool::TabletToolTipEvent {
+    fn tip_state(&self) -> TabletToolTipState {
+        match tablet_tool::TabletToolTipEvent::tip_state(self) {
+            tablet_tool::TipState::Up => backend::TabletToolTipState::Up,
+            tablet_tool::TipState::Down => backend::TabletToolTipState::Down,
+        }
+    }
+}
+
+impl<E> backend::TabletToolEvent<LibinputInputBackend> for E
+where
+    E: IsTabletEvent + event::EventTrait,
+{
+    fn tool(&self) -> TabletToolDescriptor {
+        let tool = self.tool();
+
+        let tool_type = match tool.tool_type() {
+            tablet_tool::TabletToolType::Pen => TabletToolType::Pen,
+            tablet_tool::TabletToolType::Eraser => TabletToolType::Eraser,
+            tablet_tool::TabletToolType::Brush => TabletToolType::Brush,
+            tablet_tool::TabletToolType::Pencil => TabletToolType::Pencil,
+            tablet_tool::TabletToolType::Airbrush => TabletToolType::Airbrush,
+            tablet_tool::TabletToolType::Mouse => TabletToolType::Mouse,
+            tablet_tool::TabletToolType::Lens => TabletToolType::Lens,
+            tablet_tool::TabletToolType::Totem => TabletToolType::Totem,
+        };
+
+        let hardware_serial = tool.serial();
+        let hardware_id_wacom = tool.tool_id();
+
+        let mut capabilitys = TabletToolCapabilitys::empty();
+
+        capabilitys.set(TabletToolCapabilitys::TILT, tool.has_tilt());
+        capabilitys.set(TabletToolCapabilitys::PRESSURE, tool.has_pressure());
+        capabilitys.set(TabletToolCapabilitys::DISTANCE, tool.has_distance());
+        capabilitys.set(TabletToolCapabilitys::ROTATION, tool.has_rotation());
+        capabilitys.set(TabletToolCapabilitys::SLIDER, tool.has_slider());
+        capabilitys.set(TabletToolCapabilitys::WHEEL, tool.has_wheel());
+
+        TabletToolDescriptor {
+            tool_type,
+            hardware_serial,
+            hardware_id_wacom,
+            capabilitys,
+        }
+    }
+
+    fn delta_x(&self) -> f64 {
+        tablet_tool::TabletToolEventTrait::dx(self)
+    }
+
+    fn delta_y(&self) -> f64 {
+        tablet_tool::TabletToolEventTrait::dy(self)
+    }
+
+    fn x(&self) -> f64 {
+        tablet_tool::TabletToolEventTrait::x(self)
+    }
+
+    fn y(&self) -> f64 {
+        tablet_tool::TabletToolEventTrait::y(self)
+    }
+
+    fn x_transformed(&self, width: u32) -> f64 {
+        tablet_tool::TabletToolEventTrait::x_transformed(self, width)
+    }
+
+    fn y_transformed(&self, height: u32) -> f64 {
+        tablet_tool::TabletToolEventTrait::y_transformed(self, height)
+    }
+
+    fn distance(&self) -> f64 {
+        tablet_tool::TabletToolEventTrait::distance(self)
+    }
+
+    fn distance_has_changed(&self) -> bool {
+        tablet_tool::TabletToolEventTrait::distance_has_changed(self)
+    }
+
+    fn pressure(&self) -> f64 {
+        tablet_tool::TabletToolEventTrait::pressure(self)
+    }
+
+    fn pressure_has_changed(&self) -> bool {
+        tablet_tool::TabletToolEventTrait::pressure_has_changed(self)
+    }
+
+    fn slider_position(&self) -> f64 {
+        tablet_tool::TabletToolEventTrait::slider_position(self)
+    }
+
+    fn slider_has_changed(&self) -> bool {
+        tablet_tool::TabletToolEventTrait::slider_has_changed(self)
+    }
+
+    fn tilt_x(&self) -> f64 {
+        tablet_tool::TabletToolEventTrait::dx(self)
+    }
+
+    fn tilt_x_has_changed(&self) -> bool {
+        tablet_tool::TabletToolEventTrait::tilt_x_has_changed(self)
+    }
+
+    fn tilt_y(&self) -> f64 {
+        tablet_tool::TabletToolEventTrait::dy(self)
+    }
+
+    fn tilt_y_has_changed(&self) -> bool {
+        tablet_tool::TabletToolEventTrait::tilt_y_has_changed(self)
+    }
+
+    fn rotation(&self) -> f64 {
+        tablet_tool::TabletToolEventTrait::rotation(self)
+    }
+
+    fn rotation_has_changed(&self) -> bool {
+        tablet_tool::TabletToolEventTrait::rotation_has_changed(self)
+    }
+
+    fn wheel_delta(&self) -> f64 {
+        tablet_tool::TabletToolEventTrait::wheel_delta(self)
+    }
+
+    fn wheel_delta_discrete(&self) -> i32 {
+        // I have no idea why f64 is returend by this fn, in libinput's api wheel clicks are always i32
+        tablet_tool::TabletToolEventTrait::wheel_delta_discrete(self) as i32
+    }
+
+    fn wheel_has_changed(&self) -> bool {
+        tablet_tool::TabletToolEventTrait::wheel_has_changed(self)
+    }
+}
+
+impl backend::TabletToolButtonEvent<LibinputInputBackend> for tablet_tool::TabletToolButtonEvent {
+    fn button(&self) -> u32 {
+        tablet_tool::TabletToolButtonEvent::button(&self)
+    }
+
+    fn seat_button_count(&self) -> u32 {
+        tablet_tool::TabletToolButtonEvent::seat_button_count(&self)
+    }
+
+    fn button_state(&self) -> backend::ButtonState {
+        tablet_tool::TabletToolButtonEvent::button_state(&self).into()
+    }
+}

src/backend/winit.rs

@@ -23,8 +23,8 @@ use crate::backend::egl::display::EGLDisplay;
 use crate::backend::{
     egl::{context::GlAttributes, native, EGLContext, EGLSurface, Error as EGLError},
     input::{
-        Axis, AxisSource, Device, DeviceCapability, Event as BackendEvent, InputBackend, InputEvent,
-        KeyState, KeyboardKeyEvent, MouseButton, MouseButtonState, PointerAxisEvent, PointerButtonEvent,
+        Axis, AxisSource, ButtonState, Device, DeviceCapability, Event as BackendEvent, InputBackend,
+        InputEvent, KeyState, KeyboardKeyEvent, MouseButton, PointerAxisEvent, PointerButtonEvent,
         PointerMotionAbsoluteEvent, TouchCancelEvent, TouchDownEvent, TouchMotionEvent, TouchSlot,
         TouchUpEvent, UnusedEvent,
     },
@@ -33,7 +33,7 @@ use crate::backend::{
         Bind, Renderer, Transform, Unbind,
     },
 };
-use std::{cell::RefCell, rc::Rc, time::Instant};
+use std::{cell::RefCell, path::PathBuf, rc::Rc, time::Instant};
 use wayland_egl as wegl;
 use winit::{
     dpi::{LogicalPosition, LogicalSize, PhysicalSize},
@@ -307,6 +307,14 @@ impl Device for WinitVirtualDevice {
             DeviceCapability::Keyboard | DeviceCapability::Pointer | DeviceCapability::Touch
         )
     }
+
+    fn usb_id(&self) -> Option<(u32, u32)> {
+        None
+    }
+
+    fn syspath(&self) -> Option<PathBuf> {
+        None
+    }
 }
 
 /// Errors that may happen when driving the event loop of [`WinitInputBackend`]
@@ -460,7 +468,7 @@ impl PointerButtonEvent<WinitInputBackend> for WinitMouseInputEvent {
         self.button.into()
     }
 
-    fn state(&self) -> MouseButtonState {
+    fn state(&self) -> ButtonState {
         self.state.into()
     }
 }
@@ -619,6 +627,10 @@ impl InputBackend for WinitInputBackend {
     type TouchMotionEvent = WinitTouchMovedEvent;
     type TouchCancelEvent = WinitTouchCancelledEvent;
     type TouchFrameEvent = UnusedEvent;
+    type TabletToolAxisEvent = UnusedEvent;
+    type TabletToolProximityEvent = UnusedEvent;
+    type TabletToolTipEvent = UnusedEvent;
+    type TabletToolButtonEvent = UnusedEvent;
 
     type SpecialEvent = WinitEvent;
 
@@ -846,11 +858,11 @@ impl From<ElementState> for KeyState {
     }
 }
 
-impl From<ElementState> for MouseButtonState {
+impl From<ElementState> for ButtonState {
     fn from(state: ElementState) -> Self {
         match state {
-            ElementState::Pressed => MouseButtonState::Pressed,
-            ElementState::Released => MouseButtonState::Released,
+            ElementState::Pressed => ButtonState::Pressed,
+            ElementState::Released => ButtonState::Released,
         }
     }
 }

src/wayland/mod.rs

@@ -62,6 +62,7 @@ pub mod output;
 pub mod seat;
 pub mod shell;
 pub mod shm;
+pub mod tablet_manager;
 
 /// A global [`SerialCounter`] for use in your compositor.
 ///

src/wayland/tablet_manager/mod.rs

@@ -0,0 +1,89 @@
+//! Utilities for graphics tablet support
+//!
+//! This module provides helpers to handle graphics tablets.
+//!
+//! ```
+//! # extern crate wayland_server;
+//! # #[macro_use] extern crate smithay;
+//! # use smithay::wayland::compositor::compositor_init;
+//!
+//! use smithay::wayland::seat::{Seat};
+//! use smithay::wayland::tablet_manager::{init_tablet_manager_global, TabletSeatTrait, TabletDescriptor};
+//!
+//! # let mut display = wayland_server::Display::new();
+//! # compositor_init(&mut display, |_, _| {}, None);
+//! // First we nee a reguler seat
+//! let (seat, seat_global) = Seat::new(
+//!     &mut display,
+//!     "seat-0".into(),
+//!     None
+//! );
+//!
+//! // Insert the manager global into your event loop
+//! init_tablet_manager_global(&mut display);
+//!
+//! seat
+//!    .tablet_seat()                     // Get TabletSeat asosiated with this seat
+//!    .add_tablet(&TabletDescriptor {    // Add a new tablet to a seat
+//!        name: "Test".into(),
+//!        usb_id: None,
+//!        syspath: None,
+//!    });
+//!
+//! ```
+
+use crate::wayland::seat::Seat;
+use wayland_protocols::unstable::tablet::v2::server::zwp_tablet_manager_v2::{self, ZwpTabletManagerV2};
+use wayland_server::{Display, Filter, Global, Main};
+
+const MANAGER_VERSION: u32 = 1;
+
+mod tablet;
+mod tablet_seat;
+mod tablet_tool;
+
+pub use tablet::{TabletDescriptor, TabletHandle};
+pub use tablet_seat::TabletSeatHandle;
+pub use tablet_tool::TabletToolHandle;
+
+/// Extends [Seat] with graphic tablet specyfic functionality
+pub trait TabletSeatTrait {
+    /// Get tablet seat asosiated with this seat
+    fn tablet_seat(&self) -> TabletSeatHandle;
+}
+
+impl TabletSeatTrait for Seat {
+    fn tablet_seat(&self) -> TabletSeatHandle {
+        let user_data = self.user_data();
+        user_data.insert_if_missing(TabletSeatHandle::default);
+        user_data.get::<TabletSeatHandle>().unwrap().clone()
+    }
+}
+
+/// Initialize a tablet manager global.
+pub fn init_tablet_manager_global(display: &mut Display) -> Global<ZwpTabletManagerV2> {
+    display.create_global::<ZwpTabletManagerV2, _>(
+        MANAGER_VERSION,
+        Filter::new(
+            move |(manager, _version): (Main<ZwpTabletManagerV2>, u32), _, _| {
+                manager.quick_assign(|_manager, req, _| match req {
+                    zwp_tablet_manager_v2::Request::GetTabletSeat { tablet_seat, seat } => {
+                        let seat = Seat::from_resource(&seat).unwrap();
+
+                        let user_data = seat.user_data();
+                        user_data.insert_if_missing(TabletSeatHandle::default);
+
+                        let instance = tablet_seat;
+                        let tablet_seat = user_data.get::<TabletSeatHandle>().unwrap();
+
+                        tablet_seat.add_instance(instance);
+                    }
+                    zwp_tablet_manager_v2::Request::Destroy => {
+                        // Nothing to do
+                    }
+                    _ => {}
+                });
+            },
+        ),
+    )
+}

src/wayland/tablet_manager/tablet.rs

@@ -0,0 +1,95 @@
+use std::ops::Deref as _;
+use std::path::PathBuf;
+use std::{cell::RefCell, rc::Rc};
+
+use wayland_protocols::unstable::tablet::v2::server::zwp_tablet_seat_v2::ZwpTabletSeatV2;
+use wayland_protocols::unstable::tablet::v2::server::zwp_tablet_v2::ZwpTabletV2;
+use wayland_server::protocol::wl_surface::WlSurface;
+use wayland_server::Filter;
+
+use crate::backend::input::Device;
+
+/// Description of graphics tablet device
+#[derive(Debug, Clone, Hash, Eq, PartialEq)]
+pub struct TabletDescriptor {
+    /// Tablet device name
+    pub name: String,
+    /// Tablet device USB (product,vendor) id
+    pub usb_id: Option<(u32, u32)>,
+    /// Path to the device
+    pub syspath: Option<PathBuf>,
+}
+
+impl<D: Device> From<&D> for TabletDescriptor {
+    fn from(device: &D) -> Self {
+        TabletDescriptor {
+            name: device.name(),
+            syspath: device.syspath(),
+            usb_id: device.usb_id(),
+        }
+    }
+}
+
+#[derive(Debug, Default)]
+struct Tablet {
+    instances: Vec<ZwpTabletV2>,
+}
+
+/// Handle to a tablet device
+///
+/// Tablet represents one graphics tablet device
+#[derive(Debug, Default, Clone)]
+pub struct TabletHandle {
+    inner: Rc<RefCell<Tablet>>,
+}
+
+impl TabletHandle {
+    pub(super) fn new_instance(&mut self, seat: &ZwpTabletSeatV2, tablet: &TabletDescriptor) {
+        if let Some(client) = seat.as_ref().client() {
+            let wl_tablet = client
+                .create_resource::<ZwpTabletV2>(seat.as_ref().version())
+                .unwrap();
+
+            wl_tablet.quick_assign(|_, _req, _| {});
+
+            let inner = self.inner.clone();
+            wl_tablet.assign_destructor(Filter::new(move |instance: ZwpTabletV2, _, _| {
+                inner
+                    .borrow_mut()
+                    .instances
+                    .retain(|i| !i.as_ref().equals(&instance.as_ref()));
+            }));
+
+            seat.tablet_added(&wl_tablet);
+
+            wl_tablet.name(tablet.name.clone());
+
+            if let Some((id_product, id_vendor)) = tablet.usb_id {
+                wl_tablet.id(id_product, id_vendor);
+            }
+
+            if let Some(syspath) = tablet.syspath.as_ref().and_then(|p| p.to_str()) {
+                wl_tablet.path(syspath.to_owned());
+            }
+
+            wl_tablet.done();
+
+            self.inner.borrow_mut().instances.push(wl_tablet.deref().clone());
+        }
+    }
+
+    pub(super) fn with_focused_tablet<F>(&self, focus: &WlSurface, cb: F)
+    where
+        F: Fn(&ZwpTabletV2),
+    {
+        if let Some(instance) = self
+            .inner
+            .borrow()
+            .instances
+            .iter()
+            .find(|i| i.as_ref().same_client_as(focus.as_ref()))
+        {
+            cb(instance);
+        }
+    }
+}

src/wayland/tablet_manager/tablet_seat.rs

@@ -0,0 +1,189 @@
+use wayland_protocols::unstable::tablet::v2::server::zwp_tablet_seat_v2::ZwpTabletSeatV2;
+use wayland_server::{Filter, Main};
+
+use crate::backend::input::TabletToolDescriptor;
+use crate::wayland::seat::CursorImageStatus;
+
+use super::tablet::{TabletDescriptor, TabletHandle};
+use super::tablet_tool::TabletToolHandle;
+
+use std::convert::AsRef;
+use std::fmt;
+use std::ops::Deref as _;
+use std::{cell::RefCell, collections::HashMap, rc::Rc};
+
+#[derive(Default)]
+struct TabletSeat {
+    instances: Vec<ZwpTabletSeatV2>,
+    tablets: HashMap<TabletDescriptor, TabletHandle>,
+    tools: HashMap<TabletToolDescriptor, TabletToolHandle>,
+
+    cursor_callback: Option<Box<dyn FnMut(&TabletToolDescriptor, CursorImageStatus)>>,
+}
+
+impl fmt::Debug for TabletSeat {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("TabletSeat")
+            .field("instances", &self.instances)
+            .field("tablets", &self.tablets)
+            .field("tools", &self.tools)
+            .field(
+                "cursor_callback",
+                if self.cursor_callback.is_some() {
+                    &"Some(...)"
+                } else {
+                    &"None"
+                },
+            )
+            .finish()
+    }
+}
+
+/// Handle to a tablet seat
+///
+/// TabletSeat extends `Seat` with graphic tablet specyfic functionality
+///
+/// TabletSeatHandle can be used to advertise available graphics tablets and tools to wayland clients
+#[derive(Default, Debug, Clone)]
+pub struct TabletSeatHandle {
+    inner: Rc<RefCell<TabletSeat>>,
+}
+
+impl TabletSeatHandle {
+    pub(super) fn add_instance(&self, seat: Main<ZwpTabletSeatV2>) {
+        let mut inner = self.inner.borrow_mut();
+
+        // Notify new instance about available tablets
+        for (desc, tablet) in inner.tablets.iter_mut() {
+            tablet.new_instance(seat.deref(), desc);
+        }
+
+        // Notify new instance about available tools
+        for (desc, tool) in inner.tools.iter_mut() {
+            let inner = self.inner.clone();
+            tool.new_instance(seat.deref(), desc, move |desc, status| {
+                if let Some(ref mut cursor_callback) = inner.borrow_mut().cursor_callback {
+                    cursor_callback(desc, status);
+                }
+            });
+        }
+
+        inner.instances.push(seat.deref().clone());
+
+        let inner = self.inner.clone();
+        seat.assign_destructor(Filter::new(move |seat: ZwpTabletSeatV2, _, _| {
+            inner
+                .borrow_mut()
+                .instances
+                .retain(|i| !i.as_ref().equals(&seat.as_ref()));
+        }));
+    }
+
+    /// Add a callback to SetCursor event
+    pub fn on_cursor_surface<F>(&mut self, cb: F)
+    where
+        F: FnMut(&TabletToolDescriptor, CursorImageStatus) + 'static,
+    {
+        self.inner.borrow_mut().cursor_callback = Some(Box::new(cb));
+    }
+
+    /// Add a new tablet to a seat.
+    ///
+    /// You can either add tablet on [input::Event::DeviceAdded](crate::backend::input::InputEvent::DeviceAdded) event,
+    /// or you can add tablet based on tool event, then clients will not know about devices that are not being used
+    ///
+    /// Returns new [TabletHandle] if tablet was not know by this seat, if tablet was allready know it returns exsisting handle.
+    pub fn add_tablet(&self, tablet_desc: &TabletDescriptor) -> TabletHandle {
+        let inner = &mut *self.inner.borrow_mut();
+
+        let tablets = &mut inner.tablets;
+        let instances = &inner.instances;
+
+        let tablet = tablets.entry(tablet_desc.clone()).or_insert_with(|| {
+            let mut tablet = TabletHandle::default();
+            // Create new tablet instance for every seat instance
+            for seat in instances.iter() {
+                tablet.new_instance(seat, tablet_desc);
+            }
+            tablet
+        });
+
+        tablet.clone()
+    }
+
+    /// Get a handle to a tablet
+    pub fn get_tablet(&self, tablet_desc: &TabletDescriptor) -> Option<TabletHandle> {
+        self.inner.borrow().tablets.get(tablet_desc).cloned()
+    }
+
+    /// Count all tablet devices
+    pub fn count_tablets(&self) -> usize {
+        self.inner.borrow_mut().tablets.len()
+    }
+
+    /// Remove tablet device
+    ///
+    /// Called when tablet is no longer avalible
+    /// For example on [input::Event::DeviceRemoved](crate::backend::input::InputEvent::DeviceRemoved) event.
+    pub fn remove_tablet(&self, tablet_desc: &TabletDescriptor) {
+        self.inner.borrow_mut().tablets.remove(tablet_desc);
+    }
+
+    /// Remove all tablet devices
+    pub fn clear_tablets(&self) {
+        self.inner.borrow_mut().tablets.clear();
+    }
+
+    /// Add a new tool to a seat.
+    ///
+    /// Tool is usually added on [TabletToolProximityEvent](crate::backend::input::InputEvent::TabletToolProximity) event.
+    ///
+    /// Returns new [TabletToolHandle] if tool was not know by this seat, if tool was allready know it returns exsisting handle,
+    /// it allows you to send tool input events to clients.
+    pub fn add_tool(&self, tool_desc: &TabletToolDescriptor) -> TabletToolHandle {
+        let inner = &mut *self.inner.borrow_mut();
+
+        let tools = &mut inner.tools;
+        let instances = &inner.instances;
+
+        let tool = tools.entry(tool_desc.clone()).or_insert_with(|| {
+            let mut tool = TabletToolHandle::default();
+            // Create new tool instance for every seat instance
+            for seat in instances.iter() {
+                let inner = self.inner.clone();
+                tool.new_instance(seat.deref(), tool_desc, move |desc, status| {
+                    if let Some(ref mut cursor_callback) = inner.borrow_mut().cursor_callback {
+                        cursor_callback(desc, status);
+                    }
+                });
+            }
+            tool
+        });
+
+        tool.clone()
+    }
+
+    /// Get a handle to a tablet tool
+    pub fn get_tool(&self, tool_desc: &TabletToolDescriptor) -> Option<TabletToolHandle> {
+        self.inner.borrow().tools.get(tool_desc).cloned()
+    }
+
+    /// Count all tablet tool devices
+    pub fn count_tools(&self) -> usize {
+        self.inner.borrow_mut().tools.len()
+    }
+
+    /// Remove tablet tool device
+    ///
+    /// Policy of tool removal is a compositor-specific.
+    ///
+    /// One posible policy would be to remove a tool when all tablets the tool was used on are removed.
+    pub fn remove_tool(&self, tool_desc: &TabletToolDescriptor) {
+        self.inner.borrow_mut().tools.remove(tool_desc);
+    }
+
+    /// Remove all tablet tool devices
+    pub fn clear_tools(&self) {
+        self.inner.borrow_mut().tools.clear();
+    }
+}

src/wayland/tablet_manager/tablet_tool.rs

@@ -0,0 +1,477 @@
+use std::ops::Deref as _;
+use std::sync::Mutex;
+use std::{cell::RefCell, rc::Rc};
+
+use crate::backend::input::{ButtonState, TabletToolCapabilitys, TabletToolDescriptor, TabletToolType};
+use crate::wayland::seat::{CursorImageAttributes, CursorImageStatus};
+use wayland_protocols::unstable::tablet::v2::server::{
+    zwp_tablet_seat_v2::ZwpTabletSeatV2,
+    zwp_tablet_tool_v2::{self, ZwpTabletToolV2},
+};
+use wayland_server::protocol::wl_surface::WlSurface;
+use wayland_server::Filter;
+
+use crate::wayland::{compositor, Serial};
+
+use super::tablet::TabletHandle;
+
+static CURSOR_IMAGE_ROLE: &str = "cursor_image";
+
+#[derive(Debug, Default)]
+struct TabletTool {
+    instances: Vec<ZwpTabletToolV2>,
+    focus: Option<WlSurface>,
+
+    is_down: bool,
+
+    pending_pressure: Option<f64>,
+    pending_distance: Option<f64>,
+    pending_tilt: Option<(f64, f64)>,
+    pending_slider: Option<f64>,
+    pending_rotation: Option<f64>,
+    pending_wheel: Option<(f64, i32)>,
+}
+
+impl TabletTool {
+    fn proximity_in(
+        &mut self,
+        (x, y): (f64, f64),
+        (focus, (sx, sy)): (WlSurface, (f64, f64)),
+        tablet: &TabletHandle,
+        serial: Serial,
+        time: u32,
+    ) {
+        let wl_tool = self
+            .instances
+            .iter()
+            .find(|i| i.as_ref().same_client_as(focus.as_ref()));
+
+        if let Some(wl_tool) = wl_tool {
+            tablet.with_focused_tablet(&focus, |wl_tablet| {
+                wl_tool.proximity_in(serial.into(), wl_tablet, &focus);
+                // proximity_in has to be followed by motion event (required by protocol)
+                wl_tool.motion(x - sx, y - sy);
+                wl_tool.frame(time);
+            });
+        }
+
+        self.focus = Some(focus.clone());
+    }
+
+    fn proximity_out(&mut self, time: u32) {
+        if let Some(ref focus) = self.focus {
+            let wl_tool = self
+                .instances
+                .iter()
+                .find(|i| i.as_ref().same_client_as(focus.as_ref()));
+
+            if let Some(wl_tool) = wl_tool {
+                if self.is_down {
+                    wl_tool.up();
+                    self.is_down = false;
+                }
+                wl_tool.proximity_out();
+                wl_tool.frame(time);
+            }
+        }
+
+        self.focus = None;
+    }
+
+    fn tip_down(&mut self, serial: Serial, time: u32) {
+        if let Some(ref focus) = self.focus {
+            if let Some(wl_tool) = self
+                .instances
+                .iter()
+                .find(|i| i.as_ref().same_client_as(focus.as_ref()))
+            {
+                if !self.is_down {
+                    wl_tool.down(serial.into());
+                    wl_tool.frame(time);
+                }
+            }
+        }
+
+        self.is_down = true;
+    }
+
+    fn tip_up(&mut self, time: u32) {
+        if let Some(ref focus) = self.focus {
+            if let Some(wl_tool) = self
+                .instances
+                .iter()
+                .find(|i| i.as_ref().same_client_as(focus.as_ref()))
+            {
+                if self.is_down {
+                    wl_tool.up();
+                    wl_tool.frame(time);
+                }
+            }
+        }
+
+        self.is_down = false;
+    }
+
+    fn motion(
+        &mut self,
+        pos: (f64, f64),
+        focus: Option<(WlSurface, (f64, f64))>,
+        tablet: &TabletHandle,
+        serial: Serial,
+        time: u32,
+    ) {
+        match (focus, self.focus.as_ref()) {
+            (Some(focus), Some(prev_focus)) => {
+                if &focus.0 == prev_focus {
+                    if let Some(wl_tool) = self
+                        .instances
+                        .iter()
+                        .find(|i| i.as_ref().same_client_as(focus.0.as_ref()))
+                    {
+                        let (x, y) = pos;
+                        let (sx, sy) = focus.1;
+                        wl_tool.motion(x - sx, y - sy);
+
+                        if let Some(pressure) = self.pending_pressure.take() {
+                            wl_tool.pressure((pressure * 65535.0).round() as u32);
+                        }
+
+                        if let Some(distance) = self.pending_distance.take() {
+                            wl_tool.distance((distance * 65535.0).round() as u32);
+                        }
+
+                        if let Some((x, y)) = self.pending_tilt.take() {
+                            wl_tool.tilt(x, y);
+                        }
+
+                        if let Some(slider) = self.pending_slider.take() {
+                            wl_tool.slider((slider * 65535.0).round() as i32);
+                        }
+
+                        if let Some(rotation) = self.pending_rotation.take() {
+                            wl_tool.rotation(rotation);
+                        }
+
+                        if let Some((degrees, clicks)) = self.pending_wheel.take() {
+                            wl_tool.wheel(degrees, clicks)
+                        }
+
+                        wl_tool.frame(time);
+                    }
+                } else {
+                    // If surface has changed
+
+                    // Unfocus previous surface
+                    self.proximity_out(time);
+                    // Focuss a new one
+                    self.proximity_in(pos, focus, tablet, serial, time)
+                }
+            }
+            // New surface in focus
+            (Some(focus), None) => self.proximity_in(pos, focus, tablet, serial, time),
+            // No surface in focus
+            (None, _) => self.proximity_out(time),
+        }
+    }
+
+    fn pressure(&mut self, pressure: f64) {
+        self.pending_pressure = Some(pressure);
+    }
+
+    fn distance(&mut self, distance: f64) {
+        self.pending_distance = Some(distance);
+    }
+
+    fn tilt(&mut self, tilt: (f64, f64)) {
+        self.pending_tilt = Some(tilt);
+    }
+
+    fn rotation(&mut self, rotation: f64) {
+        self.pending_rotation = Some(rotation);
+    }
+
+    fn slider_position(&mut self, slider: f64) {
+        self.pending_slider = Some(slider);
+    }
+
+    fn wheel(&mut self, degrees: f64, clicks: i32) {
+        self.pending_wheel = Some((degrees, clicks));
+    }
+
+    /// Sent whenever a button on the tool is pressed or released.
+    fn button(&self, button: u32, state: ButtonState, serial: Serial, time: u32) {
+        if let Some(ref focus) = self.focus {
+            if let Some(wl_tool) = self
+                .instances
+                .iter()
+                .find(|i| i.as_ref().same_client_as(focus.as_ref()))
+            {
+                wl_tool.button(serial.into(), button, state.into());
+                wl_tool.frame(time);
+            }
+        }
+    }
+}
+
+impl Drop for TabletTool {
+    fn drop(&mut self) {
+        for instance in self.instances.iter() {
+            // This event is sent when the tool is removed from the system and will send no further events.
+            instance.removed();
+        }
+    }
+}
+
+/// Handle to a tablet tool device
+///
+/// TabletTool represents a physical tool that has been, or is currently in use with a tablet in seat.
+///
+/// A TabletTool relation to a physical tool depends on the tablet's ability to report serial numbers. If the tablet supports this capability, then the object represents a specific physical tool and can be identified even when used on multiple tablets.
+#[derive(Debug, Default, Clone)]
+pub struct TabletToolHandle {
+    inner: Rc<RefCell<TabletTool>>,
+}
+
+impl TabletToolHandle {
+    pub(super) fn new_instance<F>(&mut self, seat: &ZwpTabletSeatV2, tool: &TabletToolDescriptor, mut cb: F)
+    where
+        F: FnMut(&TabletToolDescriptor, CursorImageStatus) + 'static,
+    {
+        if let Some(client) = seat.as_ref().client() {
+            let wl_tool = client
+                .create_resource::<ZwpTabletToolV2>(seat.as_ref().version())
+                .unwrap();
+
+            let desc = tool.clone();
+            let inner = self.inner.clone();
+            wl_tool.quick_assign(move |tool, req, _| {
+                use wayland_protocols::unstable::tablet::v2::server::zwp_tablet_tool_v2::Request;
+                match req {
+                    Request::SetCursor {
+                        surface,
+                        hotspot_x,
+                        hotspot_y,
+                        ..
+                    } => {
+                        let inner = inner.borrow();
+
+                        if let Some(ref focus) = inner.focus {
+                            if focus.as_ref().same_client_as(&tool.as_ref()) {
+                                if let Some(surface) = surface {
+                                    // tolerate re-using the same surface
+                                    if compositor::give_role(&surface, CURSOR_IMAGE_ROLE).is_err()
+                                        && compositor::get_role(&surface) != Some(CURSOR_IMAGE_ROLE)
+                                    {
+                                        tool.as_ref().post_error(
+                                            zwp_tablet_tool_v2::Error::Role as u32,
+                                            "Given wl_surface has another role.".into(),
+                                        );
+                                        return;
+                                    }
+
+                                    compositor::with_states(&surface, |states| {
+                                        states.data_map.insert_if_missing_threadsafe(|| {
+                                            Mutex::new(CursorImageAttributes { hotspot: (0, 0) })
+                                        });
+                                        states
+                                            .data_map
+                                            .get::<Mutex<CursorImageAttributes>>()
+                                            .unwrap()
+                                            .lock()
+                                            .unwrap()
+                                            .hotspot = (hotspot_x, hotspot_y);
+                                    })
+                                    .unwrap();
+
+                                    cb(&desc, CursorImageStatus::Image(surface));
+                                } else {
+                                    cb(&desc, CursorImageStatus::Hidden);
+                                };
+                            }
+                        }
+                    }
+                    Request::Destroy => {
+                        // Handled by our destructor
+                    }
+                    _ => {}
+                }
+            });
+
+            let inner = self.inner.clone();
+            wl_tool.assign_destructor(Filter::new(move |instance: ZwpTabletToolV2, _, _| {
+                inner
+                    .borrow_mut()
+                    .instances
+                    .retain(|i| !i.as_ref().equals(&instance.as_ref()));
+            }));
+
+            seat.tool_added(&wl_tool);
+
+            wl_tool._type(tool.tool_type.into());
+
+            let high: u32 = (tool.hardware_serial >> 16) as u32;
+            let low: u32 = tool.hardware_serial as u32;
+
+            wl_tool.hardware_serial(high, low);
+
+            let high: u32 = (tool.hardware_id_wacom >> 16) as u32;
+            let low: u32 = tool.hardware_id_wacom as u32;
+            wl_tool.hardware_id_wacom(high, low);
+
+            if tool.capabilitys.contains(TabletToolCapabilitys::PRESSURE) {
+                wl_tool.capability(zwp_tablet_tool_v2::Capability::Pressure);
+            }
+
+            if tool.capabilitys.contains(TabletToolCapabilitys::DISTANCE) {
+                wl_tool.capability(zwp_tablet_tool_v2::Capability::Distance);
+            }
+
+            if tool.capabilitys.contains(TabletToolCapabilitys::TILT) {
+                wl_tool.capability(zwp_tablet_tool_v2::Capability::Tilt);
+            }
+
+            if tool.capabilitys.contains(TabletToolCapabilitys::SLIDER) {
+                wl_tool.capability(zwp_tablet_tool_v2::Capability::Slider);
+            }
+
+            if tool.capabilitys.contains(TabletToolCapabilitys::ROTATION) {
+                wl_tool.capability(zwp_tablet_tool_v2::Capability::Rotation);
+            }
+
+            if tool.capabilitys.contains(TabletToolCapabilitys::WHEEL) {
+                wl_tool.capability(zwp_tablet_tool_v2::Capability::Wheel);
+            }
+
+            wl_tool.done();
+            self.inner.borrow_mut().instances.push(wl_tool.deref().clone());
+        }
+    }
+
+    /// Notifify that this tool is focused on a certain surface.
+    ///
+    /// You provide the location of the tool, in the form of:
+    ///
+    /// - The coordinates of the tool in the global compositor space
+    /// - The surface on top of which the tool is, and the coordinates of its
+    ///   origin in the global compositor space.
+    pub fn proximity_in(
+        &self,
+        pos: (f64, f64),
+        focus: (WlSurface, (f64, f64)),
+        tablet: &TabletHandle,
+        serial: Serial,
+        time: u32,
+    ) {
+        self.inner
+            .borrow_mut()
+            .proximity_in(pos, focus, tablet, serial, time)
+    }
+
+    /// Notifify that this tool has left proximity.
+    pub fn proximity_out(&self, time: u32) {
+        self.inner.borrow_mut().proximity_out(time);
+    }
+
+    /// Tablet tool is making contact
+    pub fn tip_down(&self, serial: Serial, time: u32) {
+        self.inner.borrow_mut().tip_down(serial, time);
+    }
+
+    /// Tablet tool is no longer making contact
+    pub fn tip_up(&self, time: u32) {
+        self.inner.borrow_mut().tip_up(time);
+    }
+
+    /// Notify that the tool moved
+    ///
+    /// You provide the new location of the tool, in the form of:
+    ///
+    /// - The coordinates of the tool in the global compositor space
+    /// - The surface on top of which the tool is, and the coordinates of its
+    ///   origin in the global compositor space (or `None` of the pointer is not
+    ///   on top of a client surface).
+    ///
+    /// This will internally take care of notifying the appropriate client objects
+    /// of proximity_in/proximity_out events.
+    pub fn motion(
+        &self,
+        pos: (f64, f64),
+        focus: Option<(WlSurface, (f64, f64))>,
+        tablet: &TabletHandle,
+        serial: Serial,
+        time: u32,
+    ) {
+        self.inner.borrow_mut().motion(pos, focus, tablet, serial, time)
+    }
+
+    /// Queue tool pressure update
+    ///
+    /// It will be sent alongside next motion event
+    pub fn pressure(&self, pressure: f64) {
+        self.inner.borrow_mut().pressure(pressure);
+    }
+
+    /// Queue tool distance update
+    ///
+    /// It will be sent alongside next motion event
+    pub fn distance(&self, distance: f64) {
+        self.inner.borrow_mut().distance(distance);
+    }
+
+    /// Queue tool tilt update
+    ///
+    /// It will be sent alongside next motion event
+    pub fn tilt(&self, tilt: (f64, f64)) {
+        self.inner.borrow_mut().tilt(tilt);
+    }
+
+    /// Queue tool rotation update
+    ///
+    /// It will be sent alongside next motion event
+    pub fn rotation(&self, rotation: f64) {
+        self.inner.borrow_mut().rotation(rotation);
+    }
+
+    /// Queue tool slider update
+    ///
+    /// It will be sent alongside next motion event
+    pub fn slider_position(&self, slider: f64) {
+        self.inner.borrow_mut().slider_position(slider);
+    }
+
+    /// Queue tool wheel update
+    ///
+    /// It will be sent alongside next motion event
+    pub fn wheel(&self, degrees: f64, clicks: i32) {
+        self.inner.borrow_mut().wheel(degrees, clicks);
+    }
+
+    /// Button on the tool was pressed or released
+    pub fn button(&self, button: u32, state: ButtonState, serial: Serial, time: u32) {
+        self.inner.borrow().button(button, state, serial, time);
+    }
+}
+
+impl From<TabletToolType> for zwp_tablet_tool_v2::Type {
+    fn from(from: TabletToolType) -> zwp_tablet_tool_v2::Type {
+        match from {
+            TabletToolType::Pen => zwp_tablet_tool_v2::Type::Pen,
+            TabletToolType::Eraser => zwp_tablet_tool_v2::Type::Eraser,
+            TabletToolType::Brush => zwp_tablet_tool_v2::Type::Brush,
+            TabletToolType::Pencil => zwp_tablet_tool_v2::Type::Pencil,
+            TabletToolType::Airbrush => zwp_tablet_tool_v2::Type::Airbrush,
+            TabletToolType::Mouse => zwp_tablet_tool_v2::Type::Mouse,
+            TabletToolType::Lens => zwp_tablet_tool_v2::Type::Lens,
+            _ => zwp_tablet_tool_v2::Type::Pen,
+        }
+    }
+}
+
+impl From<ButtonState> for zwp_tablet_tool_v2::ButtonState {
+    fn from(from: ButtonState) -> zwp_tablet_tool_v2::ButtonState {
+        match from {
+            ButtonState::Pressed => zwp_tablet_tool_v2::ButtonState::Pressed,
+            ButtonState::Released => zwp_tablet_tool_v2::ButtonState::Released,
+        }
+    }
+}