winit-core:winit: add tablet input support

The API is integrated into the `WindowEvent::Pointer*` API and is
present in form of `TabletTool` variant on corresponding data entries.

For now implemented for Web, Windows, and with limitations for Wayland.

Fixes #99.

Co-authored-by: daxpedda <daxpedda@gmail.com>

clippy.toml

@@ -10,6 +10,9 @@ disallowed-methods = [
     { allow-invalid = true, path = "web_sys::HtmlCanvasElement::set_width", reason = "Winit shouldn't touch the internal canvas size" },
     { allow-invalid = true, path = "web_sys::HtmlCanvasElement::width", reason = "Winit shouldn't touch the internal canvas size" },
     { allow-invalid = true, path = "web_sys::HtmlElement::style", reason = "cache this to reduce calls to JS" },
+    { allow-invalid = true, path = "web_sys::MouseEvent::buttons", reason = "Use `backend::event::cursor_buttons()` to avoid wrong conversions" },
+    { allow-invalid = true, path = "web_sys::MouseEvent::button", reason = "Use `backend::event::cursor_button()` to avoid wrong conversions" },
+    { allow-invalid = true, path = "web_sys::PointerEvent::pointer_type", reason = "Use `WebPointerType` to emit warnings" },
     { allow-invalid = true, path = "web_sys::Window::document", reason = "cache this to reduce calls to JS" },
     { allow-invalid = true, path = "web_sys::Window::get_computed_style", reason = "cache this to reduce calls to JS" },
     { allow-invalid = true, path = "web_sys::Window::navigator", reason = "cache this to reduce calls to JS" },

winit-core/src/event.rs

@@ -1,4 +1,7 @@
 //! The event enums and assorted supporting types.
+use std::cell::LazyCell;
+use std::cmp::Ordering;
+use std::f64;
 use std::path::PathBuf;
 use std::sync::{Mutex, Weak};
 
@@ -435,6 +438,7 @@ pub enum PointerKind {
     ///
     /// **macOS:** Unsupported.
     Touch(FingerId),
+    TabletTool(TabletToolKind),
     Unknown,
 }
 
@@ -485,6 +489,13 @@ pub enum PointerSource {
         ///   force will be 0.5 when a button is pressed or 0.0 otherwise.
         force: Option<Force>,
     },
+    TabletTool {
+        /// Describes as which tool kind the interaction happened.
+        kind: TabletToolKind,
+
+        /// Describes how the tool was held and used.
+        data: TabletToolData,
+    },
     Unknown,
 }
 
@@ -493,6 +504,7 @@ impl From<PointerSource> for PointerKind {
         match source {
             PointerSource::Mouse => Self::Mouse,
             PointerSource::Touch { finger_id, .. } => Self::Touch(finger_id),
+            PointerSource::TabletTool { kind, .. } => Self::TabletTool(kind),
             PointerSource::Unknown => Self::Unknown,
         }
     }
@@ -502,7 +514,7 @@ impl From<PointerSource> for PointerKind {
 ///
 /// **Wayland/X11:** [`Unknown`](Self::Unknown) device types are converted to known variants by the
 /// system.
-#[derive(Clone, Copy, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq)]
 pub enum ButtonSource {
     Mouse(MouseButton),
     /// See [`PointerSource::Touch`] for more details.
@@ -514,6 +526,11 @@ pub enum ButtonSource {
         finger_id: FingerId,
         force: Option<Force>,
     },
+    TabletTool {
+        kind: TabletToolKind,
+        button: TabletToolButton,
+        data: TabletToolData,
+    },
     Unknown(u16),
 }
 
@@ -525,6 +542,7 @@ impl ButtonSource {
         match self {
             ButtonSource::Mouse(mouse) => mouse,
             ButtonSource::Touch { .. } => MouseButton::Left,
+            ButtonSource::TabletTool { button, .. } => button.into(),
             ButtonSource::Unknown(button) => match button {
                 0 => MouseButton::Left,
                 1 => MouseButton::Middle,
@@ -981,6 +999,7 @@ pub enum TouchPhase {
 /// Describes the force of a touch event
 #[derive(Debug, Clone, Copy, PartialEq)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
+#[doc(alias = "Pressure")]
 pub enum Force {
     /// On iOS, the force is calibrated so that the same number corresponds to
     /// roughly the same amount of pressure on the screen regardless of the
@@ -991,7 +1010,7 @@ pub enum Force {
         ///
         /// The force reported by Apple Pencil is measured along the axis of the
         /// pencil. If you want a force perpendicular to the device, you need to
-        /// calculate this value using the `altitude_angle` value.
+        /// calculate this value using the [`TabletToolAngle::altitude`] value.
         force: f64,
         /// The maximum possible force for a touch.
         ///
@@ -1012,9 +1031,17 @@ impl Force {
     /// Instead of normalizing the force, you should prefer to handle
     /// [`Force::Calibrated`] so that the amount of force the user has to apply is
     /// consistent across devices.
-    pub fn normalized(&self) -> f64 {
+    ///
+    /// Passing in a [`TabletToolAngle`], returns the perpendicular force.
+    pub fn normalized(&self, angle: Option<TabletToolAngle>) -> f64 {
         match self {
-            Force::Calibrated { force, max_possible_force } => force / max_possible_force,
+            Force::Calibrated { force, max_possible_force } => {
+                let force = match angle {
+                    Some(TabletToolAngle { altitude, .. }) => force / altitude.sin(),
+                    None => *force,
+                };
+                force / max_possible_force
+            },
             Force::Normalized(force) => *force,
         }
     }
@@ -1026,6 +1053,264 @@ pub type AxisId = u32;
 /// Identifier for a specific button on some device.
 pub type ButtonId = u32;
 
+/// Tablet of the tablet tool.
+#[derive(Default, Clone, Copy, Debug, PartialEq, Eq, Hash)]
+#[cfg_attr(feature = "serde", derive(Deserialize, Serialize))]
+#[non_exhaustive]
+pub enum TabletToolKind {
+    #[default]
+    Pen,
+    Eraser,
+    Brush,
+    Pencil,
+    Airbrush,
+    Finger,
+    Mouse,
+    Lens,
+}
+
+#[derive(Default, Clone, Debug, PartialEq)]
+#[cfg_attr(feature = "serde", derive(Deserialize, Serialize))]
+pub struct TabletToolData {
+    /// The force applied to the tool against the surface.
+    ///
+    /// When the force information is not available, [`None`] is returned.
+    ///
+    /// ## Platform-specific
+    ///
+    /// **Web:** Has no mechanism to detect support, so this will always be [`Some`].
+    pub force: Option<Force>,
+    /// Represents normalized tangential pressure, also known as barrel pressure. In the range of
+    /// -1 to 1. 0 means no tangential pressure is applied. [`None`] means backend or device has no
+    /// support.
+    ///
+    /// ## Platform-specific
+    ///
+    /// **Web:** Has no mechanism to detect support, so this will always be [`Some`] with a value
+    /// of 0.
+    pub tangential_force: Option<f32>,
+    /// The clockwise rotation in degrees of a tool around its own major axis. E.g. twisting a pen
+    /// around its length. In the range of 0 to 359. [`None`] means backend or device has no
+    /// support.
+    ///
+    /// ## Platform-specific
+    ///
+    /// **Web:** Has no mechanism to detect support, so this will always be [`Some`] with a value
+    /// of 0.
+    pub twist: Option<u16>,
+    /// The plane angle in degrees. [`None`] means backend or device has no support.
+    ///
+    /// ## Platform-specific
+    ///
+    /// **Web:** Has no mechanism to detect support, so this will always be [`Some`] with default
+    /// values.
+    pub tilt: Option<TabletToolTilt>,
+    /// The angular position in radians. [`None`] means backend or device has no support.
+    ///
+    /// ## Platform-specific
+    ///
+    /// **Web:** Has no mechanism to detect device support, so this will always be [`Some`] with
+    /// default values unless browser support is lacking.
+    pub angle: Option<TabletToolAngle>,
+}
+
+impl TabletToolData {
+    /// Returns [`TabletToolTilt`] if present or calculates it from [`TabletToolAngle`].
+    pub fn tilt(self) -> Option<TabletToolTilt> {
+        if let Some(tilt) = self.tilt {
+            Some(tilt)
+        } else {
+            self.angle.map(TabletToolAngle::tilt)
+        }
+    }
+
+    /// Returns [`TabletToolAngle`] if present or calculates it from [`TabletToolTilt`].
+    pub fn angle(self) -> Option<TabletToolAngle> {
+        if let Some(angle) = self.angle {
+            Some(angle)
+        } else {
+            self.tilt.map(TabletToolTilt::angle)
+        }
+    }
+}
+
+/// The plane angle in degrees of a tool.
+#[derive(Clone, Copy, Debug, Default, Eq, Hash, Ord, PartialEq, PartialOrd)]
+#[cfg_attr(feature = "serde", derive(Deserialize, Serialize))]
+pub struct TabletToolTilt {
+    /// The plane angle in degrees between the surface Y-Z plane and the plane containing the tool
+    /// and the surface Y axis. Positive values are to the right. In the range of -90 to 90. 0
+    /// means the tool is perpendicular to the surface and is the default.
+    ///
+    /// ![Tilt X](https://raw.githubusercontent.com/rust-windowing/winit/master/winit/docs/res/tool_tilt_x.webp)
+    ///
+    /// <sub>
+    ///   For image attribution, see the
+    ///   <a href="https://github.com/rust-windowing/winit/blob/master/winit/docs/ATTRIBUTION.md">
+    ///     ATTRIBUTION.md
+    ///   </a>
+    ///   file.
+    /// </sub>
+    pub x: i8,
+    /// The plane angle in degrees between the surface X-Z plane and the plane containing the tool
+    /// and the surface X axis. Positive values are towards the user. In the range of -90 to
+    /// 90. 0 means the tool is perpendicular to the surface and is the default.
+    ///
+    /// ![Tilt Y](https://raw.githubusercontent.com/rust-windowing/winit/master/winit/docs/res/tool_tilt_y.webp)
+    ///
+    /// <sub>
+    ///   For image attribution, see the
+    ///   <a href="https://github.com/rust-windowing/winit/blob/master/winit/docs/ATTRIBUTION.md">
+    ///     ATTRIBUTION.md
+    ///   </a>
+    ///   file.
+    /// </sub>
+    pub y: i8,
+}
+
+impl TabletToolTilt {
+    pub fn angle(self) -> TabletToolAngle {
+        // See <https://www.w3.org/TR/2024/WD-pointerevents3-20240326/#converting-between-tiltx-tilty-and-altitudeangle-azimuthangle>.
+
+        use std::f64::consts::*;
+
+        const PI_0_5: f64 = FRAC_PI_2;
+        const PI_1_5: f64 = 3. * FRAC_PI_2;
+        const PI_2: f64 = 2. * PI;
+
+        let x = LazyCell::new(|| f64::from(self.x).to_radians());
+        let y = LazyCell::new(|| f64::from(self.y).to_radians());
+
+        let mut azimuth = 0.;
+
+        if self.x == 0 {
+            match self.y.cmp(&0) {
+                Ordering::Greater => azimuth = PI_0_5,
+                Ordering::Less => azimuth = PI_1_5,
+                Ordering::Equal => (),
+            }
+        } else if self.y == 0 {
+            if self.x < 0 {
+                azimuth = PI;
+            }
+        } else if self.x.abs() == 90 || self.y.abs() == 90 {
+            // not enough information to calculate azimuth
+            azimuth = 0.;
+        } else {
+            // Non-boundary case: neither tiltX nor tiltY is equal to 0 or +-90
+            azimuth = f64::atan2(y.tan(), x.tan());
+
+            if azimuth < 0. {
+                azimuth += PI_2;
+            }
+        }
+
+        let altitude;
+
+        if self.x.abs() == 90 || self.y.abs() == 90 {
+            altitude = 0.;
+        } else if self.x == 0 {
+            altitude = PI_0_5 - y.abs();
+        } else if self.y == 0 {
+            altitude = PI_0_5 - x.abs();
+        } else {
+            // Non-boundary case: neither tiltX nor tiltY is equal to 0 or +-90
+            altitude = f64::atan(1. / f64::sqrt(x.tan().powi(2) + y.tan().powi(2)));
+        }
+
+        TabletToolAngle { altitude, azimuth }
+    }
+}
+
+/// The angular position in radians of a tool.
+#[derive(Clone, Copy, Debug, PartialEq)]
+#[cfg_attr(feature = "serde", derive(Deserialize, Serialize))]
+pub struct TabletToolAngle {
+    /// The altitude angle in radians between the tools perpendicular position to the surface and
+    /// the surface X-Y plane. In the range of 0, parallel to the surface, to π/2, perpendicular to
+    /// the surface. π/2 means the tool is perpendicular to the surface and is the default.
+    ///
+    /// ![Altitude angle](https://raw.githubusercontent.com/rust-windowing/winit/master/docs/res/tool_altitude.webp)
+    ///
+    /// <sub>
+    ///   For image attribution, see the
+    ///   <a href="https://github.com/rust-windowing/winit/blob/master/docs/res/ATTRIBUTION.md">
+    ///     ATTRIBUTION.md
+    ///   </a>
+    ///   file.
+    /// </sub>
+    pub altitude: f64,
+    /// The azimuth angle in radiants representing the rotation between the major axis of the tool
+    /// and the surface X-Y plane. In the range of 0, 3 o'clock, progressively increasing clockwise
+    /// to 2π. 0 means the tool is at 3 o'clock or is perpendicular to the surface (`altitude` of
+    /// π/2) and is the default.
+    ///
+    /// ![Azimuth angle](https://raw.githubusercontent.com/rust-windowing/winit/master/docs/res/tool_azimuth.webp)
+    ///
+    /// <sub>
+    ///   For image attribution, see the
+    ///   <a href="https://github.com/rust-windowing/winit/blob/master/docs/res/ATTRIBUTION.md">
+    ///     ATTRIBUTION.md
+    ///   </a>
+    ///   file.
+    /// </sub>
+    pub azimuth: f64,
+}
+
+impl Default for TabletToolAngle {
+    fn default() -> Self {
+        Self { altitude: f64::consts::FRAC_2_PI, azimuth: 0. }
+    }
+}
+
+impl TabletToolAngle {
+    pub fn tilt(self) -> TabletToolTilt {
+        // See <https://www.w3.org/TR/2024/WD-pointerevents3-20240326/#converting-between-tiltx-tilty-and-altitudeangle-azimuthangle>.
+
+        use std::f64::consts::*;
+
+        const PI_0_5: f64 = FRAC_PI_2;
+        const PI_1_5: f64 = 3. * FRAC_PI_2;
+        const PI_2: f64 = 2. * PI;
+
+        let mut x = 0.;
+        let mut y = 0.;
+
+        if self.altitude == 0. {
+            if self.azimuth == 0. || self.azimuth == PI_2 {
+                x = FRAC_PI_2;
+            } else if self.azimuth == PI_0_5 {
+                y = FRAC_PI_2;
+            } else if self.azimuth == PI {
+                x = -FRAC_PI_2;
+            } else if self.azimuth == PI_1_5 {
+                y = -FRAC_PI_2;
+            } else if self.azimuth > 0. && self.azimuth < PI_0_5 {
+                x = FRAC_PI_2;
+                y = FRAC_PI_2;
+            } else if self.azimuth > PI_0_5 && self.azimuth < PI {
+                x = -FRAC_PI_2;
+                y = FRAC_PI_2;
+            } else if self.azimuth > PI && self.azimuth < PI_1_5 {
+                x = -FRAC_PI_2;
+                y = -FRAC_PI_2;
+            } else if self.azimuth > PI_1_5 && self.azimuth < PI_2 {
+                x = FRAC_PI_2;
+                y = -FRAC_PI_2;
+            }
+        }
+
+        if self.altitude != 0. {
+            let altitude = self.altitude.tan();
+
+            x = f64::atan(f64::cos(self.azimuth) / altitude);
+            y = f64::atan(f64::sin(self.azimuth) / altitude);
+        }
+
+        TabletToolTilt { x: x.to_degrees().round() as i8, y: y.to_degrees().round() as i8 }
+    }
+}
+
 /// Describes the input state of a key.
 #[derive(Debug, Hash, PartialEq, Eq, Clone, Copy)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
@@ -1058,6 +1343,28 @@ pub enum MouseButton {
     Other(u16),
 }
 
+/// Describes a button of a tool, e.g. a pen.
+#[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
+#[cfg_attr(feature = "serde", derive(Deserialize, Serialize))]
+pub enum TabletToolButton {
+    Contact,
+    Barrel,
+    Other(u16),
+}
+
+impl From<TabletToolButton> for MouseButton {
+    fn from(tool: TabletToolButton) -> Self {
+        match tool {
+            TabletToolButton::Contact => MouseButton::Left,
+            TabletToolButton::Barrel => MouseButton::Right,
+            TabletToolButton::Other(1) => MouseButton::Middle,
+            TabletToolButton::Other(3) => MouseButton::Back,
+            TabletToolButton::Other(4) => MouseButton::Forward,
+            TabletToolButton::Other(other) => MouseButton::Other(other),
+        }
+    }
+}
+
 /// Describes a difference in the mouse scroll wheel state.
 #[derive(Debug, Clone, Copy, PartialEq)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
@@ -1241,16 +1548,85 @@ mod tests {
         });
     }
 
+    #[test]
+    fn test_tilt_angle_conversions() {
+        use std::f64::consts::*;
+
+        use event::{TabletToolAngle, TabletToolTilt};
+
+        // See <https://github.com/web-platform-tests/wpt/blob/5af3e9c2a2aba76ade00f0dbc3486e50a74a4506/pointerevents/pointerevent_tiltX_tiltY_to_azimuth_altitude.html#L11-L23>.
+        const TILT_TO_ANGLE: &[(TabletToolTilt, TabletToolAngle)] = &[
+            (TabletToolTilt { x: 0, y: 0 }, TabletToolAngle { altitude: FRAC_PI_2, azimuth: 0. }),
+            (TabletToolTilt { x: 0, y: 90 }, TabletToolAngle { altitude: 0., azimuth: FRAC_PI_2 }),
+            (TabletToolTilt { x: 0, y: -90 }, TabletToolAngle {
+                altitude: 0.,
+                azimuth: 3. * FRAC_PI_2,
+            }),
+            (TabletToolTilt { x: 90, y: 0 }, TabletToolAngle { altitude: 0., azimuth: 0. }),
+            (TabletToolTilt { x: 90, y: 90 }, TabletToolAngle { altitude: 0., azimuth: 0. }),
+            (TabletToolTilt { x: 90, y: -90 }, TabletToolAngle { altitude: 0., azimuth: 0. }),
+            (TabletToolTilt { x: -90, y: 0 }, TabletToolAngle { altitude: 0., azimuth: PI }),
+            (TabletToolTilt { x: -90, y: 90 }, TabletToolAngle { altitude: 0., azimuth: 0. }),
+            (TabletToolTilt { x: -90, y: -90 }, TabletToolAngle { altitude: 0., azimuth: 0. }),
+            (TabletToolTilt { x: 0, y: 45 }, TabletToolAngle {
+                altitude: FRAC_PI_4,
+                azimuth: FRAC_PI_2,
+            }),
+            (TabletToolTilt { x: 0, y: -45 }, TabletToolAngle {
+                altitude: FRAC_PI_4,
+                azimuth: 3. * FRAC_PI_2,
+            }),
+            (TabletToolTilt { x: 45, y: 0 }, TabletToolAngle { altitude: FRAC_PI_4, azimuth: 0. }),
+            (TabletToolTilt { x: -45, y: 0 }, TabletToolAngle { altitude: FRAC_PI_4, azimuth: PI }),
+        ];
+
+        for (tilt, angle) in TILT_TO_ANGLE {
+            assert_eq!(tilt.angle(), *angle, "{tilt:?}");
+        }
+
+        // See <https://github.com/web-platform-tests/wpt/blob/5af3e9c2a2aba76ade00f0dbc3486e50a74a4506/pointerevents/pointerevent_tiltX_tiltY_to_azimuth_altitude.html#L38-L46>.
+        const ANGLE_TO_TILT: &[(TabletToolAngle, TabletToolTilt)] = &[
+            (TabletToolAngle { altitude: 0., azimuth: 0. }, TabletToolTilt { x: 90, y: 0 }),
+            (TabletToolAngle { altitude: FRAC_PI_4, azimuth: 0. }, TabletToolTilt { x: 45, y: 0 }),
+            (TabletToolAngle { altitude: FRAC_PI_2, azimuth: 0. }, TabletToolTilt { x: 0, y: 0 }),
+            (TabletToolAngle { altitude: 0., azimuth: FRAC_PI_2 }, TabletToolTilt { x: 0, y: 90 }),
+            (TabletToolAngle { altitude: FRAC_PI_4, azimuth: FRAC_PI_2 }, TabletToolTilt {
+                x: 0,
+                y: 45,
+            }),
+            (TabletToolAngle { altitude: 0., azimuth: PI }, TabletToolTilt { x: -90, y: 0 }),
+            (TabletToolAngle { altitude: FRAC_PI_4, azimuth: PI }, TabletToolTilt { x: -45, y: 0 }),
+            (TabletToolAngle { altitude: 0., azimuth: 3. * FRAC_PI_2 }, TabletToolTilt {
+                x: 0,
+                y: -90,
+            }),
+            (TabletToolAngle { altitude: FRAC_PI_4, azimuth: 3. * FRAC_PI_2 }, TabletToolTilt {
+                x: 0,
+                y: -45,
+            }),
+        ];
+
+        for (angle, tilt) in ANGLE_TO_TILT {
+            assert_eq!(angle.tilt(), *tilt, "{angle:?}");
+        }
+    }
+
     #[test]
     fn test_force_normalize() {
         let force = event::Force::Normalized(0.0);
-        assert_eq!(force.normalized(), 0.0);
+        assert_eq!(force.normalized(None), 0.0);
 
         let force2 = event::Force::Calibrated { force: 5.0, max_possible_force: 2.5 };
-        assert_eq!(force2.normalized(), 2.0);
+        assert_eq!(force2.normalized(None), 2.0);
 
         let force3 = event::Force::Calibrated { force: 5.0, max_possible_force: 2.5 };
-        assert_eq!(force3.normalized(), 2.0);
+        assert_eq!(
+            force3.normalized(Some(event::TabletToolAngle {
+                altitude: std::f64::consts::PI / 2.0,
+                azimuth: 0.
+            })),
+            2.0
+        );
     }
 
     #[allow(clippy::clone_on_copy)]

winit-uikit/src/view.rs

@@ -461,6 +461,10 @@ impl WinitView {
         let window = self.window().unwrap();
         let mut touch_events = Vec::new();
         for touch in touches {
+            if let UITouchType::Pencil = touch.r#type() {
+                continue;
+            }
+
             let logical_location = touch.locationInView(None);
             let touch_type = touch.r#type();
             let force = if let UITouchType::Pencil = touch_type {

winit-wayland/src/seat/mod.rs

@@ -13,6 +13,7 @@ use sctk::seat::pointer::{ThemeSpec, ThemedPointer};
 use sctk::seat::{Capability as SeatCapability, SeatHandler, SeatState};
 use tracing::warn;
 use wayland_protocols::wp::pointer_gestures::zv1::client::zwp_pointer_gesture_pinch_v1::ZwpPointerGesturePinchV1;
+use wayland_protocols::wp::tablet::zv2::client::zwp_tablet_seat_v2::ZwpTabletSeatV2;
 use winit_core::event::WindowEvent;
 use winit_core::keyboard::ModifiersState;
 
@@ -50,6 +51,9 @@ pub struct WinitSeatState {
     /// The text input bound on the seat.
     text_input: Option<Arc<ZwpTextInputV3>>,
 
+    /// The tablet input bound on the seat.
+    tablet: Option<Arc<ZwpTabletSeatV2>>,
+
     /// The relative pointer bound on the seat.
     relative_pointer: Option<ZwpRelativePointerV1>,
 
@@ -156,6 +160,12 @@ impl SeatHandler for WinitState {
                 TextInputData::default(),
             )));
         }
+
+        if let Some(tablet_state) =
+            seat_state.tablet.is_none().then_some(self.tablet_state.as_ref()).flatten()
+        {
+            seat_state.tablet = Some(Arc::new(tablet_state.get_tablet_seat(&seat, queue_handle)));
+        }
     }
 
     fn remove_capability(
@@ -177,6 +187,11 @@ impl SeatHandler for WinitState {
             text_input.destroy();
         }
 
+        // NOTE: figure out when this should actually be destroyed.
+        if let Some(tablet) = seat_state.tablet.take() {
+            tablet.destroy();
+        }
+
         match capability {
             SeatCapability::Touch => {
                 if let Some(touch) = seat_state.touch.take() {

winit-wayland/src/state.rs

@@ -30,6 +30,7 @@ use crate::seat::{
 };
 use crate::types::kwin_blur::KWinBlurManager;
 use crate::types::wp_fractional_scaling::FractionalScalingManager;
+use crate::types::wp_tablet_input_v2::TabletManager;
 use crate::types::wp_viewporter::ViewporterState;
 use crate::types::xdg_activation::XdgActivationState;
 use crate::types::xdg_toplevel_icon_manager::XdgToplevelIconManagerState;
@@ -100,6 +101,9 @@ pub struct WinitState {
     /// Relative pointer.
     pub relative_pointer: Option<RelativePointerState>,
 
+    /// Tablet manager.
+    pub tablet_state: Option<TabletManager>,
+
     /// Pointer constraints to handle pointer locking and confining.
     pub pointer_constraints: Option<Arc<PointerConstraintsState>>,
 
@@ -194,6 +198,7 @@ impl WinitState {
             text_input_state: TextInputState::new(globals, queue_handle).ok(),
 
             relative_pointer: RelativePointerState::new(globals, queue_handle).ok(),
+            tablet_state: TabletManager::new(globals, queue_handle).ok(),
             pointer_constraints: PointerConstraintsState::new(globals, queue_handle)
                 .map(Arc::new)
                 .ok(),

winit-wayland/src/types/mod.rs

@@ -3,6 +3,7 @@
 pub mod cursor;
 pub mod kwin_blur;
 pub mod wp_fractional_scaling;
+pub mod wp_tablet_input_v2;
 pub mod wp_viewporter;
 pub mod xdg_activation;
 pub mod xdg_toplevel_icon_manager;

winit-wayland/src/types/wp_tablet_input_v2.rs

@@ -0,0 +1,343 @@
+//! Handling of wp_tablet_input_v2.
+
+use std::sync::Mutex;
+
+use dpi::LogicalPosition;
+use sctk::compositor::SurfaceData;
+use sctk::globals::GlobalData;
+use sctk::reexports::client::backend::smallvec::SmallVec;
+use sctk::reexports::client::globals::{BindError, GlobalList};
+use sctk::reexports::client::protocol::wl_seat::WlSeat;
+use sctk::reexports::client::protocol::wl_surface::WlSurface;
+use sctk::reexports::client::{
+    delegate_dispatch, event_created_child, Connection, Dispatch, Proxy, QueueHandle, WEnum,
+};
+use sctk::reexports::protocols::wp::tablet::zv2::client::zwp_tablet_manager_v2::ZwpTabletManagerV2;
+use sctk::reexports::protocols::wp::tablet::zv2::client::zwp_tablet_pad_v2::ZwpTabletPadV2;
+use sctk::reexports::protocols::wp::tablet::zv2::client::zwp_tablet_seat_v2::{
+    self, ZwpTabletSeatV2,
+};
+use sctk::reexports::protocols::wp::tablet::zv2::client::zwp_tablet_tool_v2::{
+    ButtonState, Event as ToolEvent, Type as ToolType, ZwpTabletToolV2,
+};
+use sctk::reexports::protocols::wp::tablet::zv2::client::zwp_tablet_v2::ZwpTabletV2;
+use winit_core::event::{
+    ButtonSource, ElementState, Force, PointerKind, PointerSource, TabletToolButton,
+    TabletToolData as CoreTabletToolData, TabletToolKind, TabletToolTilt, WindowEvent,
+};
+
+use crate::state::WinitState;
+
+/// KWin blur manager.
+#[derive(Debug, Clone)]
+pub struct TabletManager {
+    manager: ZwpTabletManagerV2,
+}
+
+impl TabletManager {
+    pub fn new(
+        globals: &GlobalList,
+        queue_handle: &QueueHandle<WinitState>,
+    ) -> Result<Self, BindError> {
+        // Ignore v2 since we are not interested in its events.
+        let manager = globals.bind(queue_handle, 1..=1, GlobalData)?;
+        Ok(Self { manager })
+    }
+
+    pub fn get_tablet_seat(
+        &self,
+        seat: &WlSeat,
+        queue_handle: &QueueHandle<WinitState>,
+    ) -> ZwpTabletSeatV2 {
+        self.manager.get_tablet_seat(seat, queue_handle, ())
+    }
+}
+impl Dispatch<ZwpTabletManagerV2, GlobalData, WinitState> for TabletManager {
+    fn event(
+        _: &mut WinitState,
+        _: &ZwpTabletManagerV2,
+        _: <ZwpTabletManagerV2 as Proxy>::Event,
+        _: &GlobalData,
+        _: &Connection,
+        _: &QueueHandle<WinitState>,
+    ) {
+        unreachable!("no events defined for zwp_tablet_manager_v2");
+    }
+}
+
+impl Dispatch<ZwpTabletManagerV2, (), WinitState> for TabletManager {
+    fn event(
+        _: &mut WinitState,
+        _: &ZwpTabletManagerV2,
+        _: <ZwpTabletManagerV2 as Proxy>::Event,
+        _: &(),
+        _: &Connection,
+        _: &QueueHandle<WinitState>,
+    ) {
+        unreachable!("no events defined for zwp_tablet_manager_v2");
+    }
+}
+
+impl Dispatch<ZwpTabletSeatV2, (), WinitState> for TabletManager {
+    event_created_child!(WinitState, ZwpTabletSeatV2, [
+        zwp_tablet_seat_v2::EVT_TABLET_ADDED_OPCODE => (ZwpTabletV2, Default::default()),
+        zwp_tablet_seat_v2::EVT_TOOL_ADDED_OPCODE => (ZwpTabletToolV2, Default::default()),
+        zwp_tablet_seat_v2::EVT_PAD_ADDED_OPCODE => (ZwpTabletPadV2, Default::default())
+    ]);
+
+    fn event(
+        _: &mut WinitState,
+        _: &ZwpTabletSeatV2,
+        _: <ZwpTabletSeatV2 as Proxy>::Event,
+        _: &(),
+        _: &Connection,
+        _: &QueueHandle<WinitState>,
+    ) {
+    }
+}
+
+impl Dispatch<ZwpTabletToolV2, TabletToolData, WinitState> for TabletManager {
+    fn event(
+        state: &mut WinitState,
+        _: &ZwpTabletToolV2,
+        event: <ZwpTabletToolV2 as Proxy>::Event,
+        data: &TabletToolData,
+        _: &Connection,
+        _: &QueueHandle<WinitState>,
+    ) {
+        let mut data = data.inner.lock().unwrap();
+
+        match event {
+            ToolEvent::Type { tool_type: WEnum::Value(tool_type) } => {
+                data.ty = match tool_type {
+                    ToolType::Pen => TabletToolKind::Pen,
+                    ToolType::Eraser => TabletToolKind::Eraser,
+                    ToolType::Brush => TabletToolKind::Brush,
+                    ToolType::Pencil => TabletToolKind::Pencil,
+                    ToolType::Airbrush => TabletToolKind::Airbrush,
+                    ToolType::Finger => TabletToolKind::Finger,
+                    ToolType::Mouse => TabletToolKind::Mouse,
+                    ToolType::Lens => TabletToolKind::Lens,
+                    _ => return,
+                };
+            },
+            ToolEvent::Capability { .. } => {},
+            ToolEvent::Done => (),
+            ToolEvent::ProximityIn { serial, surface, .. } => {
+                data.pending.push(TabletEvent::Enter { serial, surface });
+            },
+            ToolEvent::ProximityOut => data.pending.push(TabletEvent::Left),
+            ToolEvent::Down { serial } => {
+                let event = TabletEvent::Button {
+                    state: ElementState::Pressed,
+                    serial: Some(serial),
+                    button: TabletToolButton::Contact,
+                };
+
+                data.pending.push(event);
+            },
+            ToolEvent::Up => {
+                let event = TabletEvent::Button {
+                    state: ElementState::Released,
+                    serial: None,
+                    button: TabletToolButton::Contact,
+                };
+
+                data.pending.push(event);
+            },
+            ToolEvent::Tilt { tilt_x, tilt_y } => {
+                data.tool_state.tilt = Some(TabletToolTilt { x: tilt_x as i8, y: tilt_y as i8 });
+            },
+            ToolEvent::Motion { x, y } => {
+                data.position = (x, y).into();
+                data.pending.push(TabletEvent::Moved);
+            },
+            ToolEvent::Pressure { pressure } => {
+                data.tool_state.force = Some(Force::Normalized(pressure as f64 / u16::MAX as f64));
+            },
+            ToolEvent::Rotation { degrees } => {
+                data.tool_state.twist = Some(degrees as u16);
+            },
+            ToolEvent::Button { serial, button, state: WEnum::Value(state) } => {
+                let state = match state {
+                    ButtonState::Released => ElementState::Released,
+                    ButtonState::Pressed => ElementState::Pressed,
+                    _ => return,
+                };
+
+                // Map similar to SDL.
+                let button = match button {
+                    // BTN_STYLUS.
+                    0x14b => TabletToolButton::Contact,
+                    0x14c => TabletToolButton::Barrel,
+                    // BTN_STYLUS3.
+                    0x149 => TabletToolButton::Other(1),
+                    // There's no defined conversion for any of that.
+                    button => TabletToolButton::Other(button as u16),
+                };
+
+                let event = TabletEvent::Button { button, state, serial: Some(serial) };
+                data.pending.push(event);
+            },
+            ToolEvent::Frame { .. } => {
+                let kind = data.ty;
+                for event in std::mem::take(&mut data.pending) {
+                    if let TabletEvent::Enter { surface, serial } = &event {
+                        data.latest_enter_serial = Some(*serial);
+                        data.surface = Some(surface.clone());
+                    }
+
+                    // Handle events only for top-level surface.
+                    let surface = match data
+                        .surface
+                        .as_ref()
+                        .map(|surface| (surface, surface.data::<SurfaceData>()))
+                    {
+                        Some((surface, Some(surface_data)))
+                            if surface_data.parent_surface().is_none() =>
+                        {
+                            surface
+                        },
+                        _ => continue,
+                    };
+
+                    let window_id = crate::make_wid(surface);
+
+                    // Ensure that window exists.
+                    let window = match state.windows.get_mut().get_mut(&window_id) {
+                        Some(window) => window.lock().unwrap(),
+                        None => continue,
+                    };
+
+                    let position = data.position.to_physical(window.scale_factor());
+
+                    let window_event = match event {
+                        TabletEvent::Enter { .. } => WindowEvent::PointerEntered {
+                            device_id: None,
+                            position,
+                            primary: true,
+                            kind: PointerKind::TabletTool(kind),
+                        },
+                        TabletEvent::Moved => WindowEvent::PointerMoved {
+                            device_id: None,
+                            position,
+                            primary: true,
+                            source: PointerSource::TabletTool {
+                                kind,
+                                data: data.tool_state.clone(),
+                            },
+                        },
+                        TabletEvent::Button { button, state, serial } => {
+                            // Update serial if we have it.
+                            if let Some(serial) = serial {
+                                data.latest_button_serial = Some(serial);
+                            }
+
+                            WindowEvent::PointerButton {
+                                device_id: None,
+                                state,
+                                position,
+                                primary: true,
+                                button: ButtonSource::TabletTool {
+                                    kind,
+                                    button,
+                                    data: data.tool_state.clone(),
+                                },
+                            }
+                        },
+                        TabletEvent::Left => WindowEvent::PointerLeft {
+                            device_id: None,
+                            position: Some(position),
+                            primary: true,
+                            kind: PointerKind::TabletTool(kind),
+                        },
+                    };
+
+                    state.events_sink.push_window_event(window_event, window_id);
+
+                    // Clear up the surface after we've processed `Left` event.
+                    if matches!(event, TabletEvent::Left) {
+                        data.surface = None;
+                        data.latest_button_serial = None;
+                        data.latest_enter_serial = None;
+                        data.tool_state = Default::default();
+                    }
+                }
+            },
+            _ => (),
+        }
+    }
+}
+
+#[derive(Debug, Default)]
+struct TabletToolData {
+    inner: Mutex<TabletToolDataInner>,
+}
+
+#[derive(Debug, Default)]
+pub(crate) struct TabletToolDataInner {
+    pub(crate) ty: TabletToolKind,
+
+    /// Core tablet tool data.
+    pub(crate) tool_state: CoreTabletToolData,
+
+    /// Pending events until the `frame` is received.
+    pub(crate) pending: SmallVec<[TabletEvent; 4]>,
+
+    /// Surface the tablet most recently entered.
+    pub(crate) surface: Option<WlSurface>,
+
+    /// Position relative to the surface.
+    pub(crate) position: LogicalPosition<f64>,
+
+    // NOTE: even though we don't utilize serials
+    // right now, track them anyway.
+    /// The serial of the latest enter event for the pointer
+    pub(crate) latest_enter_serial: Option<u32>,
+
+    /// The serial of the latest button event for the pointer
+    pub(crate) latest_button_serial: Option<u32>,
+}
+
+// Due to wayland using logical coordinates,
+// delay the conversion to physical until the dispatch actually happens,
+// so the scaling is applied at the time of actual dispatch, since it
+// can technically change before the `frame` event.
+#[derive(Debug, Clone)]
+pub(crate) enum TabletEvent {
+    Enter { serial: u32, surface: WlSurface },
+    Left,
+    Moved,
+    Button { button: TabletToolButton, state: ElementState, serial: Option<u32> },
+}
+
+impl Dispatch<ZwpTabletV2, (), WinitState> for TabletManager {
+    fn event(
+        _: &mut WinitState,
+        _: &ZwpTabletV2,
+        _: <ZwpTabletV2 as Proxy>::Event,
+        _: &(),
+        _: &Connection,
+        _: &QueueHandle<WinitState>,
+    ) {
+    }
+}
+
+impl Dispatch<ZwpTabletPadV2, (), WinitState> for TabletManager {
+    fn event(
+        _: &mut WinitState,
+        _: &ZwpTabletPadV2,
+        _: <ZwpTabletPadV2 as Proxy>::Event,
+        _: &(),
+        _: &Connection,
+        _: &QueueHandle<WinitState>,
+    ) {
+    }
+}
+
+delegate_dispatch!(WinitState: [ZwpTabletManagerV2: GlobalData] => TabletManager);
+delegate_dispatch!(WinitState: [ZwpTabletManagerV2: ()] => TabletManager);
+delegate_dispatch!(WinitState: [ZwpTabletSeatV2: ()] => TabletManager);
+delegate_dispatch!(WinitState: [ZwpTabletV2: ()] => TabletManager);
+delegate_dispatch!(WinitState: [ZwpTabletToolV2: TabletToolData] => TabletManager);
+delegate_dispatch!(WinitState: [ZwpTabletPadV2: ()] => TabletManager);

winit-web/src/cursor.rs

@@ -216,7 +216,7 @@ impl CursorHandler {
             Cursor::Custom(cursor) => {
                 let cursor = match cursor.cast_ref::<CustomCursor>() {
                     Some(cursor) => cursor,
-                    None => todo!(),
+                    None => return,
                 };
 
                 if let SelectedCursor::Loading { cursor: old_cursor, .. }

winit-web/src/event_loop/runner.rs

@@ -24,7 +24,7 @@ use crate::event_loop::ActiveEventLoop;
 use crate::main_thread::MainThreadMarker;
 use crate::monitor::MonitorHandler;
 use crate::r#async::DispatchRunner;
-use crate::web_sys::event::mouse_button_to_id;
+use crate::web_sys::event::ButtonsState;
 use crate::window::Inner;
 use crate::{backend, event, EventLoop, PollStrategy, WaitUntilStrategy};
 
@@ -318,8 +318,10 @@ impl Shared {
                 // chorded button event
                 let device_id = event::mkdid(event.pointer_id());
 
-                if let Some(button) = backend::event::mouse_button(&event) {
-                    let state = if backend::event::mouse_buttons(&event).contains(button.into()) {
+                if let Some(button) = backend::event::raw_button(&event) {
+                    let state = if backend::event::pointer_buttons(&event)
+                        .contains(ButtonsState::from_bits_retain(button))
+                    {
                         ElementState::Pressed
                     } else {
                         ElementState::Released
@@ -327,10 +329,7 @@ impl Shared {
 
                     runner.send_event(Event::DeviceEvent {
                         device_id,
-                        event: DeviceEvent::Button {
-                            button: mouse_button_to_id(button).into(),
-                            state,
-                        },
+                        event: DeviceEvent::Button { button: button.into(), state },
                     });
 
                     return;
@@ -338,14 +337,16 @@ impl Shared {
 
                 // pointer move event
                 let mut delta = backend::event::MouseDelta::init(&navigator, &event);
-                runner.send_events(backend::event::pointer_move_event(event).map(|event| {
+                runner.send_events(backend::event::pointer_move_event(event).map(
+                    |event: web_sys::PointerEvent| {
                         let delta = delta.delta(&event).to_physical(backend::scale_factor(&window));
 
                         Event::DeviceEvent {
                             device_id,
                             event: DeviceEvent::PointerMotion { delta: (delta.x, delta.y) },
                         }
-                }));
+                    },
+                ));
             }),
         ));
         let runner = self.clone();
@@ -375,11 +376,11 @@ impl Shared {
                     return;
                 }
 
-                let button = backend::event::mouse_button(&event).expect("no mouse button pressed");
+                let button = backend::event::raw_button(&event).expect("no pointer button pressed");
                 runner.send_event(Event::DeviceEvent {
                     device_id: event::mkdid(event.pointer_id()),
                     event: DeviceEvent::Button {
-                        button: mouse_button_to_id(button).into(),
+                        button: button.into(),
                         state: ElementState::Pressed,
                     },
                 });
@@ -394,11 +395,11 @@ impl Shared {
                     return;
                 }
 
-                let button = backend::event::mouse_button(&event).expect("no mouse button pressed");
+                let button = backend::event::raw_button(&event).expect("no pointer button pressed");
                 runner.send_event(Event::DeviceEvent {
                     device_id: event::mkdid(event.pointer_id()),
                     event: DeviceEvent::Button {
-                        button: mouse_button_to_id(button).into(),
+                        button: button.into(),
                         state: ElementState::Released,
                     },
                 });

winit-web/src/web_sys/event.rs

@@ -1,11 +1,16 @@
 use std::cell::OnceCell;
+use std::f64;
 
 use dpi::{LogicalPosition, PhysicalPosition, Position};
 use smol_str::SmolStr;
+use tracing::warn;
 use wasm_bindgen::prelude::wasm_bindgen;
 use wasm_bindgen::{JsCast, JsValue};
-use web_sys::{KeyboardEvent, MouseEvent, Navigator, PointerEvent, WheelEvent};
-use winit_core::event::{FingerId, MouseButton, MouseScrollDelta, PointerKind};
+use web_sys::{Event, KeyboardEvent, MouseEvent, Navigator, PointerEvent, WheelEvent};
+use winit_core::event::{
+    ButtonSource, FingerId, Force, MouseButton, MouseScrollDelta, PointerKind, PointerSource,
+    TabletToolAngle, TabletToolButton, TabletToolData, TabletToolKind, TabletToolTilt,
+};
 use winit_core::keyboard::{
     Key, KeyCode, KeyLocation, ModifiersState, NamedKey, NativeKey, NativeKeyCode, PhysicalKey,
 };
@@ -16,11 +21,12 @@ bitflags::bitflags! {
     // https://www.w3.org/TR/pointerevents3/#the-buttons-property
     #[derive(Debug, Clone, Copy, PartialEq, Eq)]
     pub struct ButtonsState: u16 {
-        const LEFT    = 0b00001;
-        const RIGHT   = 0b00010;
-        const MIDDLE  = 0b00100;
-        const BACK    = 0b01000;
-        const FORWARD = 0b10000;
+        const LEFT    = 0b000001;
+        const RIGHT   = 0b000010;
+        const MIDDLE  = 0b000100;
+        const BACK    = 0b001000;
+        const FORWARD = 0b010000;
+        const ERASER  = 0b100000;
     }
 }
 
@@ -37,6 +43,15 @@ impl From<ButtonsState> for MouseButton {
     }
 }
 
+impl From<ButtonSource> for ButtonsState {
+    fn from(value: ButtonSource) -> Self {
+        match value {
+            ButtonSource::TabletTool { button, .. } => button.into(),
+            other => ButtonsState::from(other.mouse_button()),
+        }
+    }
+}
+
 impl From<MouseButton> for ButtonsState {
     fn from(value: MouseButton) -> Self {
         match value {
@@ -50,37 +65,133 @@ impl From<MouseButton> for ButtonsState {
     }
 }
 
-pub fn mouse_buttons(event: &MouseEvent) -> ButtonsState {
+impl From<TabletToolButton> for ButtonsState {
+    fn from(tool: TabletToolButton) -> Self {
+        match tool {
+            TabletToolButton::Contact => ButtonsState::LEFT,
+            TabletToolButton::Barrel => ButtonsState::RIGHT,
+            TabletToolButton::Other(value) => Self::from_bits_retain(value),
+        }
+    }
+}
+
+pub fn pointer_buttons(event: &MouseEvent) -> ButtonsState {
+    #[allow(clippy::disallowed_methods)]
     ButtonsState::from_bits_retain(event.buttons())
 }
 
-pub fn mouse_button(event: &MouseEvent) -> Option<MouseButton> {
+pub fn raw_button(event: &MouseEvent) -> Option<u16> {
     // https://www.w3.org/TR/pointerevents3/#the-button-property
-    match event.button() {
-        -1 => None,
-        0 => Some(MouseButton::Left),
-        1 => Some(MouseButton::Middle),
-        2 => Some(MouseButton::Right),
-        3 => Some(MouseButton::Back),
-        4 => Some(MouseButton::Forward),
-        i => {
-            Some(MouseButton::Other(i.try_into().expect("unexpected negative mouse button value")))
+    #[allow(clippy::disallowed_methods)]
+    let button = event.button();
+
+    if button == -1 {
+        None
+    } else {
+        Some(button.try_into().expect("unexpected negative mouse button value"))
+    }
+}
+
+pub fn mouse_button(button: u16) -> MouseButton {
+    match button {
+        0 => MouseButton::Left,
+        1 => MouseButton::Middle,
+        2 => MouseButton::Right,
+        3 => MouseButton::Back,
+        4 => MouseButton::Forward,
+        other => MouseButton::Other(other),
+    }
+}
+
+pub fn tool_button(button: u16) -> TabletToolButton {
+    match button {
+        0 => TabletToolButton::Contact,
+        2 => TabletToolButton::Barrel,
+        other => TabletToolButton::Other(other),
+    }
+}
+
+#[derive(Clone, Copy)]
+pub enum WebPointerType {
+    Mouse,
+    Touch,
+    Pen,
+}
+
+impl WebPointerType {
+    pub fn from_event(event: &PointerEvent) -> Option<Self> {
+        #[allow(clippy::disallowed_methods)]
+        let r#type = event.pointer_type();
+
+        match r#type.as_ref() {
+            "mouse" => Some(Self::Mouse),
+            "touch" => Some(Self::Touch),
+            "pen" => Some(Self::Pen),
+            r#type => {
+                warn!("found unknown pointer type: {type}");
+                None
             },
         }
-}
-
-pub fn mouse_button_to_id(button: MouseButton) -> u16 {
-    match button {
-        MouseButton::Left => 0,
-        MouseButton::Right => 1,
-        MouseButton::Middle => 2,
-        MouseButton::Back => 3,
-        MouseButton::Forward => 4,
-        MouseButton::Other(value) => value,
     }
 }
 
-pub fn mouse_position(event: &MouseEvent) -> LogicalPosition<f64> {
+pub fn pointer_kind(event: &PointerEvent, pointer_id: i32) -> PointerKind {
+    match WebPointerType::from_event(event) {
+        Some(WebPointerType::Mouse) => PointerKind::Mouse,
+        Some(WebPointerType::Touch) => PointerKind::Touch(FingerId::from_raw(pointer_id as usize)),
+        Some(WebPointerType::Pen) => {
+            PointerKind::TabletTool(if pointer_buttons(event).contains(ButtonsState::ERASER) {
+                TabletToolKind::Eraser
+            } else {
+                TabletToolKind::Pen
+            })
+        },
+        None => PointerKind::Unknown,
+    }
+}
+
+pub fn pointer_source(event: &PointerEvent, kind: PointerKind) -> PointerSource {
+    #[wasm_bindgen]
+    extern "C" {
+        #[wasm_bindgen(extends = PointerEvent, extends = MouseEvent, extends = Event)]
+        pub type PointerEventExt;
+
+        #[wasm_bindgen(method, getter, js_name = altitudeAngle)]
+        pub fn altitude_angle(this: &PointerEventExt) -> Option<f64>;
+
+        #[wasm_bindgen(method, getter, js_name = azimuthAngle)]
+        pub fn azimuth_angle(this: &PointerEventExt) -> f64;
+    }
+
+    let event: &PointerEventExt = event.unchecked_ref();
+
+    match kind {
+        PointerKind::Mouse => PointerSource::Mouse,
+        PointerKind::Touch(id) => PointerSource::Touch {
+            finger_id: id,
+            force: Some(Force::Normalized(event.pressure().into())),
+        },
+        PointerKind::TabletTool(tool) => {
+            let data = TabletToolData {
+                force: Some(Force::Normalized(event.pressure().into())),
+                tangential_force: Some(event.tangential_pressure()),
+                twist: Some(event.twist().try_into().expect("found invalid `twist`")),
+                tilt: Some(TabletToolTilt {
+                    x: event.tilt_x().try_into().expect("found invalid `tiltX`"),
+                    y: event.tilt_y().try_into().expect("found invalid `tiltY`"),
+                }),
+                angle: event
+                    .altitude_angle()
+                    .map(|altitude| TabletToolAngle { altitude, azimuth: event.azimuth_angle() }),
+            };
+
+            PointerSource::TabletTool { kind: tool, data }
+        },
+        PointerKind::Unknown => PointerSource::Unknown,
+    }
+}
+
+pub fn pointer_position(event: &MouseEvent) -> LogicalPosition<f64> {
     #[wasm_bindgen]
     extern "C" {
         type MouseEventExt;
@@ -113,7 +224,7 @@ impl MouseDelta {
             Some(Engine::Chromium) => Self::Chromium,
             // Firefox has wrong movement values in coalesced events.
             Some(Engine::Gecko) if has_coalesced_events_support(event) => Self::Gecko {
-                old_position: mouse_position(event),
+                old_position: pointer_position(event),
                 old_delta: LogicalPosition::new(
                     event.movement_x() as f64,
                     event.movement_y() as f64,
@@ -129,7 +240,7 @@ impl MouseDelta {
                 PhysicalPosition::new(event.movement_x(), event.movement_y()).into()
             },
             MouseDelta::Gecko { old_position, old_delta } => {
-                let new_position = mouse_position(event);
+                let new_position = pointer_position(event);
                 let x = new_position.x - old_position.x + old_delta.x;
                 let y = new_position.y - old_position.y + old_delta.y;
                 *old_position = new_position;
@@ -160,14 +271,6 @@ pub fn mouse_scroll_delta(
     }
 }
 
-pub fn pointer_type(event: &PointerEvent, pointer_id: i32) -> PointerKind {
-    match event.pointer_type().as_str() {
-        "mouse" => PointerKind::Mouse,
-        "touch" => PointerKind::Touch(FingerId::from_raw(pointer_id as usize)),
-        _ => PointerKind::Unknown,
-    }
-}
-
 pub fn key_code(event: &KeyboardEvent) -> PhysicalKey {
     // Use keyboard-types' parsing (it is based on the W3C standard).
     match event.code().parse() {

winit-web/src/web_sys/pointer.rs

@@ -3,14 +3,14 @@ use std::rc::Rc;
 
 use dpi::PhysicalPosition;
 use web_sys::PointerEvent;
-use winit_core::event::{ButtonSource, DeviceId, ElementState, Force, PointerKind, PointerSource};
+use winit_core::event::{ButtonSource, DeviceId, ElementState, PointerKind, PointerSource};
 use winit_core::keyboard::ModifiersState;
 
 use super::canvas::Common;
 use super::event;
 use super::event_handle::EventListenerHandle;
 use crate::event::mkdid;
-use crate::web_sys::event::mouse_button_to_id;
+use crate::web_sys::event::ButtonsState;
 
 #[allow(dead_code)]
 pub(super) struct PointerHandler {
@@ -46,8 +46,8 @@ impl PointerHandler {
                 let pointer_id = event.pointer_id();
                 let device_id = mkdid(pointer_id);
                 let position =
-                    event::mouse_position(&event).to_physical(super::scale_factor(&window));
-                let kind = event::pointer_type(&event, pointer_id);
+                    event::pointer_position(&event).to_physical(super::scale_factor(&window));
+                let kind = event::pointer_kind(&event, pointer_id);
                 handler(modifiers, device_id, event.is_primary(), position, kind);
             }));
     }
@@ -64,8 +64,8 @@ impl PointerHandler {
                 let pointer_id = event.pointer_id();
                 let device_id = mkdid(pointer_id);
                 let position =
-                    event::mouse_position(&event).to_physical(super::scale_factor(&window));
-                let kind = event::pointer_type(&event, pointer_id);
+                    event::pointer_position(&event).to_physical(super::scale_factor(&window));
+                let kind = event::pointer_kind(&event, pointer_id);
                 handler(modifiers, device_id, event.is_primary(), position, kind);
             }));
     }
@@ -80,24 +80,25 @@ impl PointerHandler {
             Some(canvas_common.add_event("pointerup", move |event: PointerEvent| {
                 let modifiers = event::mouse_modifiers(&event);
                 let pointer_id = event.pointer_id();
-                let kind = event::pointer_type(&event, pointer_id);
+                let kind = event::pointer_kind(&event, pointer_id);
+                let button = event::raw_button(&event).expect("no button pressed");
 
-                let button = event::mouse_button(&event).expect("no mouse button pressed");
-
-                let source = match kind {
-                    PointerKind::Mouse => ButtonSource::Mouse(button),
-                    PointerKind::Touch(finger_id) => ButtonSource::Touch {
-                        finger_id,
-                        force: Some(Force::Normalized(event.pressure().into())),
+                let source = match event::pointer_source(&event, kind) {
+                    PointerSource::Mouse => ButtonSource::Mouse(event::mouse_button(button)),
+                    PointerSource::Touch { finger_id, force } => {
+                        ButtonSource::Touch { finger_id, force }
                     },
-                    PointerKind::Unknown => ButtonSource::Unknown(mouse_button_to_id(button)),
+                    PointerSource::TabletTool { kind, data } => {
+                        ButtonSource::TabletTool { kind, button: event::tool_button(button), data }
+                    },
+                    PointerSource::Unknown => ButtonSource::Unknown(button),
                 };
 
                 handler(
                     modifiers,
                     mkdid(pointer_id),
                     event.is_primary(),
-                    event::mouse_position(&event).to_physical(super::scale_factor(&window)),
+                    event::pointer_position(&event).to_physical(super::scale_factor(&window)),
                     source,
                 )
             }));
@@ -125,11 +126,11 @@ impl PointerHandler {
 
                 let modifiers = event::mouse_modifiers(&event);
                 let pointer_id = event.pointer_id();
-                let kind = event::pointer_type(&event, pointer_id);
-                let button = event::mouse_button(&event).expect("no mouse button pressed");
+                let kind = event::pointer_kind(&event, pointer_id);
+                let button = event::raw_button(&event).expect("no button pressed");
 
-                let source = match kind {
-                    PointerKind::Mouse => {
+                let source = match event::pointer_source(&event, kind) {
+                    PointerSource::Mouse => {
                         // Error is swallowed here since the error would occur every time the
                         // mouse is clicked when the cursor is
                         // grabbed, and there is probably not a
@@ -137,20 +138,29 @@ impl PointerHandler {
                         // care if it fails.
                         let _e = canvas.set_pointer_capture(pointer_id);
 
-                        ButtonSource::Mouse(button)
+                        ButtonSource::Mouse(event::mouse_button(button))
                     },
-                    PointerKind::Touch(finger_id) => ButtonSource::Touch {
-                        finger_id,
-                        force: Some(Force::Normalized(event.pressure().into())),
+                    PointerSource::Touch { finger_id, force } => {
+                        ButtonSource::Touch { finger_id, force }
                     },
-                    PointerKind::Unknown => ButtonSource::Unknown(mouse_button_to_id(button)),
+                    PointerSource::TabletTool { kind, data } => {
+                        // Error is swallowed here since the error would occur every time the
+                        // mouse is clicked when the cursor is
+                        // grabbed, and there is probably not a
+                        // situation where this could fail, that we
+                        // care if it fails.
+                        let _e = canvas.set_pointer_capture(pointer_id);
+
+                        ButtonSource::TabletTool { kind, button: event::tool_button(button), data }
+                    },
+                    PointerSource::Unknown => ButtonSource::Unknown(button),
                 };
 
                 handler(
                     modifiers,
                     mkdid(pointer_id),
                     event.is_primary(),
-                    event::mouse_position(&event).to_physical(super::scale_factor(&window)),
+                    event::pointer_position(&event).to_physical(super::scale_factor(&window)),
                     source,
                 )
             }));
@@ -186,11 +196,11 @@ impl PointerHandler {
             Some(canvas_common.add_event("pointermove", move |event: PointerEvent| {
                 let pointer_id = event.pointer_id();
                 let device_id = mkdid(pointer_id);
-                let kind = event::pointer_type(&event, pointer_id);
+                let kind = event::pointer_kind(&event, pointer_id);
                 let primary = event.is_primary();
 
                 // chorded button event
-                if let Some(button) = event::mouse_button(&event) {
+                if let Some(button) = event::raw_button(&event) {
                     if prevent_default.get() {
                         // prevent text selection
                         event.prevent_default();
@@ -198,34 +208,36 @@ impl PointerHandler {
                         let _ = canvas.focus();
                     }
 
-                    let state = if event::mouse_buttons(&event).contains(button.into()) {
+                    let state = if event::pointer_buttons(&event)
+                        .contains(ButtonsState::from_bits_retain(button))
+                    {
                         ElementState::Pressed
                     } else {
                         ElementState::Released
                     };
 
-                    let button = match kind {
-                        PointerKind::Mouse => ButtonSource::Mouse(button),
-                        PointerKind::Touch(finger_id) => {
-                            let button_id = mouse_button_to_id(button);
-
-                            if button_id != 1 {
-                                tracing::error!("unexpected touch button id: {button_id}");
+                    let button = match event::pointer_source(&event, kind) {
+                        PointerSource::Mouse => ButtonSource::Mouse(event::mouse_button(button)),
+                        PointerSource::Touch { finger_id, force } => {
+                            if button != 0 {
+                                tracing::error!("unexpected touch button id: {button}");
                             }
 
-                            ButtonSource::Touch {
-                                finger_id,
-                                force: Some(Force::Normalized(event.pressure().into())),
-                            }
+                            ButtonSource::Touch { finger_id, force }
                         },
-                        PointerKind::Unknown => todo!(),
+                        PointerSource::TabletTool { kind, data } => ButtonSource::TabletTool {
+                            kind,
+                            button: event::tool_button(button),
+                            data,
+                        },
+                        PointerSource::Unknown => ButtonSource::Unknown(button),
                     };
 
                     button_handler(
                         event::mouse_modifiers(&event),
                         device_id,
                         primary,
-                        event::mouse_position(&event).to_physical(super::scale_factor(&window)),
+                        event::pointer_position(&event).to_physical(super::scale_factor(&window)),
                         state,
                         button,
                     );
@@ -242,15 +254,8 @@ impl PointerHandler {
                         (
                             event::mouse_modifiers(&event),
                             event.is_primary(),
-                            event::mouse_position(&event).to_physical(scale),
-                            match kind {
-                                PointerKind::Mouse => PointerSource::Mouse,
-                                PointerKind::Touch(finger_id) => PointerSource::Touch {
-                                    finger_id,
-                                    force: Some(Force::Normalized(event.pressure().into())),
-                                },
-                                PointerKind::Unknown => PointerSource::Unknown,
-                            },
+                            event::pointer_position(&event).to_physical(scale),
+                            event::pointer_source(&event, kind),
                         )
                     }),
                 );

winit-win32/src/event_loop.rs

@@ -44,28 +44,29 @@ use windows_sys::Win32::UI::WindowsAndMessaging::{
     GetMenu, LoadCursorW, MsgWaitForMultipleObjectsEx, PeekMessageW, PostMessageW,
     RegisterClassExW, RegisterWindowMessageA, SetCursor, SetWindowPos, SystemParametersInfoW,
     TranslateMessage, CREATESTRUCTW, GWL_STYLE, GWL_USERDATA, HTCAPTION, HTCLIENT, MINMAXINFO,
-    MNC_CLOSE, MSG, MWMO_INPUTAVAILABLE, NCCALCSIZE_PARAMS, PM_REMOVE, PT_TOUCH, QS_ALLINPUT,
-    RI_MOUSE_HWHEEL, RI_MOUSE_WHEEL, SC_MINIMIZE, SC_RESTORE, SIZE_MAXIMIZED,
-    SPI_GETWHEELSCROLLCHARS, SPI_GETWHEELSCROLLLINES, SWP_NOACTIVATE, SWP_NOMOVE, SWP_NOSIZE,
-    SWP_NOZORDER, WHEEL_DELTA, WINDOWPOS, WMSZ_BOTTOM, WMSZ_BOTTOMLEFT, WMSZ_BOTTOMRIGHT,
-    WMSZ_LEFT, WMSZ_RIGHT, WMSZ_TOP, WMSZ_TOPLEFT, WMSZ_TOPRIGHT, WM_CAPTURECHANGED, WM_CLOSE,
-    WM_CREATE, WM_DESTROY, WM_DPICHANGED, WM_ENTERSIZEMOVE, WM_EXITSIZEMOVE, WM_GETMINMAXINFO,
-    WM_IME_COMPOSITION, WM_IME_ENDCOMPOSITION, WM_IME_SETCONTEXT, WM_IME_STARTCOMPOSITION,
-    WM_INPUT, WM_KEYDOWN, WM_KEYUP, WM_KILLFOCUS, WM_LBUTTONDOWN, WM_LBUTTONUP, WM_MBUTTONDOWN,
-    WM_MBUTTONUP, WM_MENUCHAR, WM_MOUSEHWHEEL, WM_MOUSEMOVE, WM_MOUSEWHEEL, WM_NCACTIVATE,
-    WM_NCCALCSIZE, WM_NCCREATE, WM_NCDESTROY, WM_NCLBUTTONDOWN, WM_PAINT, WM_POINTERDOWN,
-    WM_POINTERUP, WM_POINTERUPDATE, WM_RBUTTONDOWN, WM_RBUTTONUP, WM_SETCURSOR, WM_SETFOCUS,
-    WM_SETTINGCHANGE, WM_SIZE, WM_SIZING, WM_SYSCOMMAND, WM_SYSKEYDOWN, WM_SYSKEYUP, WM_TOUCH,
-    WM_WINDOWPOSCHANGED, WM_WINDOWPOSCHANGING, WM_XBUTTONDOWN, WM_XBUTTONUP, WNDCLASSEXW,
-    WS_EX_LAYERED, WS_EX_NOACTIVATE, WS_EX_TOOLWINDOW, WS_EX_TRANSPARENT, WS_OVERLAPPED, WS_POPUP,
-    WS_VISIBLE,
+    MNC_CLOSE, MSG, MWMO_INPUTAVAILABLE, NCCALCSIZE_PARAMS, PEN_FLAG_BARREL, PEN_FLAG_ERASER,
+    PEN_MASK_PRESSURE, PEN_MASK_ROTATION, PEN_MASK_TILT_X, PEN_MASK_TILT_Y, PM_REMOVE, PT_PEN,
+    PT_TOUCH, QS_ALLINPUT, RI_MOUSE_HWHEEL, RI_MOUSE_WHEEL, SC_MINIMIZE, SC_RESTORE,
+    SIZE_MAXIMIZED, SPI_GETWHEELSCROLLCHARS, SPI_GETWHEELSCROLLLINES, SWP_NOACTIVATE, SWP_NOMOVE,
+    SWP_NOSIZE, SWP_NOZORDER, WHEEL_DELTA, WINDOWPOS, WMSZ_BOTTOM, WMSZ_BOTTOMLEFT,
+    WMSZ_BOTTOMRIGHT, WMSZ_LEFT, WMSZ_RIGHT, WMSZ_TOP, WMSZ_TOPLEFT, WMSZ_TOPRIGHT,
+    WM_CAPTURECHANGED, WM_CLOSE, WM_CREATE, WM_DESTROY, WM_DPICHANGED, WM_ENTERSIZEMOVE,
+    WM_EXITSIZEMOVE, WM_GETMINMAXINFO, WM_IME_COMPOSITION, WM_IME_ENDCOMPOSITION,
+    WM_IME_SETCONTEXT, WM_IME_STARTCOMPOSITION, WM_INPUT, WM_KEYDOWN, WM_KEYUP, WM_KILLFOCUS,
+    WM_LBUTTONDOWN, WM_LBUTTONUP, WM_MBUTTONDOWN, WM_MBUTTONUP, WM_MENUCHAR, WM_MOUSEHWHEEL,
+    WM_MOUSEMOVE, WM_MOUSEWHEEL, WM_NCACTIVATE, WM_NCCALCSIZE, WM_NCCREATE, WM_NCDESTROY,
+    WM_NCLBUTTONDOWN, WM_PAINT, WM_POINTERDOWN, WM_POINTERUP, WM_POINTERUPDATE, WM_RBUTTONDOWN,
+    WM_RBUTTONUP, WM_SETCURSOR, WM_SETFOCUS, WM_SETTINGCHANGE, WM_SIZE, WM_SIZING, WM_SYSCOMMAND,
+    WM_SYSKEYDOWN, WM_SYSKEYUP, WM_TOUCH, WM_WINDOWPOSCHANGED, WM_WINDOWPOSCHANGING,
+    WM_XBUTTONDOWN, WM_XBUTTONUP, WNDCLASSEXW, WS_EX_LAYERED, WS_EX_NOACTIVATE, WS_EX_TOOLWINDOW,
+    WS_EX_TRANSPARENT, WS_OVERLAPPED, WS_POPUP, WS_VISIBLE,
 };
 use winit_core::application::ApplicationHandler;
 use winit_core::cursor::{CustomCursor, CustomCursorSource};
 use winit_core::error::{EventLoopError, NotSupportedError, RequestError};
 use winit_core::event::{
-    DeviceEvent, DeviceId, FingerId, Force, Ime, RawKeyEvent, SurfaceSizeWriter, TouchPhase,
-    WindowEvent,
+    DeviceEvent, DeviceId, FingerId, Force, Ime, RawKeyEvent, SurfaceSizeWriter, TabletToolButton,
+    TabletToolData, TabletToolKind, TabletToolTilt, TouchPhase, WindowEvent,
 };
 use winit_core::event_loop::pump_events::PumpStatus;
 use winit_core::event_loop::{
@@ -106,6 +107,7 @@ pub(crate) struct WindowData {
     pub key_event_builder: KeyEventBuilder,
     pub _file_drop_handler: Option<FileDropHandler>,
     pub userdata_removed: Cell<bool>,
+    pub last_tablet_down_button_state: Cell<u32>,
     pub recurse_depth: Cell<u32>,
 }
 
@@ -2085,22 +2087,6 @@ unsafe fn public_window_callback_inner(
                         continue;
                     }
 
-                    let force = if let PT_TOUCH = pointer_info.pointerType {
-                        let mut touch_info = mem::MaybeUninit::uninit();
-                        util::GET_POINTER_TOUCH_INFO.and_then(|GetPointerTouchInfo| {
-                            match unsafe {
-                                GetPointerTouchInfo(pointer_info.pointerId, touch_info.as_mut_ptr())
-                            } {
-                                0 => None,
-                                _ => normalize_pointer_pressure(unsafe {
-                                    touch_info.assume_init().pressure
-                                }),
-                            }
-                        })
-                    } else {
-                        None
-                    };
-
                     let x = location.x as f64 + x.fract();
                     let y = location.y as f64 + y.fract();
                     let position = PhysicalPosition::new(x, y);
@@ -2108,60 +2094,83 @@ unsafe fn public_window_callback_inner(
                     let finger_id = FingerId::from_raw(pointer_info.pointerId as usize);
                     let primary = util::has_flag(pointer_info.pointerFlags, POINTER_FLAG_PRIMARY);
 
-                    if util::has_flag(pointer_info.pointerFlags, POINTER_FLAG_DOWN) {
+                    let is_down = util::has_flag(pointer_info.pointerFlags, POINTER_FLAG_DOWN);
+                    if is_down || util::has_flag(pointer_info.pointerFlags, POINTER_FLAG_UP) {
+                        let (kind, button) = match pointer_info.pointerType {
+                            PT_TOUCH => (PointerKind::Touch(finger_id), ButtonSource::Touch {
+                                finger_id,
+                                force: force_for_touch(pointer_info.pointerId),
+                            }),
+                            PT_PEN => {
+                                let kind = PointerKind::TabletTool(TabletToolKind::Pen);
+                                let (mut pen_flags, data) =
+                                    tablet_tool_info_for_pen(pointer_info.pointerId);
+                                let old_pen_flags =
+                                    userdata.last_tablet_down_button_state.replace(pen_flags);
+                                // For release, use a diff.
+                                if !is_down {
+                                    pen_flags ^= old_pen_flags;
+                                };
+
+                                let button = ButtonSource::TabletTool {
+                                    kind: TabletToolKind::Pen,
+                                    button: pen_flags_to_button(pen_flags),
+                                    data,
+                                };
+
+                                (kind, button)
+                            },
+                            _ => (PointerKind::Unknown, ButtonSource::Unknown(0)),
+                        };
+
+                        if is_down {
                             userdata.send_window_event(window, WindowEvent::PointerEntered {
                                 device_id: None,
                                 primary,
                                 position,
-                            kind: if let PT_TOUCH = pointer_info.pointerType {
-                                PointerKind::Touch(finger_id)
-                            } else {
-                                PointerKind::Unknown
-                            },
+                                kind,
                             });
+
                             userdata.send_window_event(window, WindowEvent::PointerButton {
                                 device_id: None,
                                 primary,
                                 state: Pressed,
                                 position,
-                            button: if let PT_TOUCH = pointer_info.pointerType {
-                                ButtonSource::Touch { finger_id, force }
-                            } else {
-                                ButtonSource::Unknown(0)
-                            },
+                                button,
                             });
-                    } else if util::has_flag(pointer_info.pointerFlags, POINTER_FLAG_UP) {
+                        } else {
                             userdata.send_window_event(window, WindowEvent::PointerButton {
                                 device_id: None,
                                 primary,
                                 state: Released,
                                 position,
-                            button: if let PT_TOUCH = pointer_info.pointerType {
-                                ButtonSource::Touch { finger_id, force }
-                            } else {
-                                ButtonSource::Unknown(0)
-                            },
+                                button,
                             });
                             userdata.send_window_event(window, WindowEvent::PointerLeft {
                                 device_id: None,
                                 primary,
                                 position: Some(position),
-                            kind: if let PT_TOUCH = pointer_info.pointerType {
-                                PointerKind::Touch(finger_id)
-                            } else {
-                                PointerKind::Unknown
-                            },
+                                kind,
                             });
+                        }
                     } else if util::has_flag(pointer_info.pointerFlags, POINTER_FLAG_UPDATE) {
+                        let source = match pointer_info.pointerType {
+                            PT_TOUCH => PointerSource::Touch {
+                                finger_id,
+                                force: force_for_touch(pointer_info.pointerId),
+                            },
+                            PT_PEN => PointerSource::TabletTool {
+                                kind: TabletToolKind::Pen,
+                                data: tablet_tool_info_for_pen(pointer_info.pointerId).1,
+                            },
+                            _ => PointerSource::Unknown,
+                        };
+
                         userdata.send_window_event(window, WindowEvent::PointerMoved {
                             device_id: None,
                             primary,
                             position,
-                            source: if let PT_TOUCH = pointer_info.pointerType {
-                                PointerSource::Touch { finger_id, force }
-                            } else {
-                                PointerSource::Unknown
-                            },
+                            source,
                         });
                     } else {
                         continue;
@@ -2691,3 +2700,57 @@ fn apply_win10_dpi_adjustment(
 
     conservative_rect
 }
+
+fn force_for_touch(pointer_id: u32) -> Option<Force> {
+    let mut touch_info = mem::MaybeUninit::uninit();
+    util::GET_POINTER_TOUCH_INFO.and_then(|GetPointerTouchInfo| {
+        match unsafe { GetPointerTouchInfo(pointer_id, touch_info.as_mut_ptr()) } {
+            0 => None,
+            _ => normalize_pointer_pressure(unsafe { touch_info.assume_init().pressure }),
+        }
+    })
+}
+
+// Information is stored on the same thing, so we don't save anything by
+// splitting the functions.
+fn tablet_tool_info_for_pen(pointer_id: u32) -> (u32, TabletToolData) {
+    let mut tool_data = TabletToolData::default();
+    let mut tool_button = 0;
+
+    let mut tablet_info = mem::MaybeUninit::uninit();
+    util::GET_POINTER_PEN_INFO.map(|GetPointerPenInfo| {
+        if unsafe { GetPointerPenInfo(pointer_id, tablet_info.as_mut_ptr()) } == 0 {
+            return;
+        }
+
+        let pen_info = unsafe { tablet_info.assume_init() };
+        if pen_info.penMask & PEN_MASK_PRESSURE != 0 {
+            tool_data.force = normalize_pointer_pressure(pen_info.pressure);
+        }
+        if pen_info.penMask & (PEN_MASK_TILT_X | PEN_MASK_TILT_Y) != 0 {
+            tool_data.tilt =
+                Some(TabletToolTilt { x: pen_info.tiltX as i8, y: pen_info.tiltY as i8 });
+        }
+        if pen_info.penMask & PEN_MASK_ROTATION != 0 {
+            tool_data.twist = Some(pen_info.rotation as u16);
+        }
+
+        tool_button = pen_info.penFlags;
+    });
+
+    (tool_button, tool_data)
+}
+
+// NOTE: According to firefox, the buttons while can be combined, in
+// reality they are not.
+fn pen_flags_to_button(flags: u32) -> TabletToolButton {
+    if flags & PEN_FLAG_BARREL != 0 {
+        TabletToolButton::Barrel
+    } else if flags & PEN_FLAG_ERASER != 0 {
+        // NOTE: this is likely not a correct thing to do, but route
+        // it that way for now.
+        TabletToolButton::Other(PEN_FLAG_ERASER as u16)
+    } else {
+        TabletToolButton::Contact
+    }
+}

winit-win32/src/util.rs

@@ -16,7 +16,7 @@ use windows_sys::Win32::UI::HiDpi::{
     DPI_AWARENESS_CONTEXT, MONITOR_DPI_TYPE, PROCESS_DPI_AWARENESS,
 };
 use windows_sys::Win32::UI::Input::KeyboardAndMouse::GetActiveWindow;
-use windows_sys::Win32::UI::Input::Pointer::{POINTER_INFO, POINTER_TOUCH_INFO};
+use windows_sys::Win32::UI::Input::Pointer::{POINTER_INFO, POINTER_PEN_INFO, POINTER_TOUCH_INFO};
 use windows_sys::Win32::UI::WindowsAndMessaging::{
     ClipCursor, GetClientRect, GetClipCursor, GetCursorPos, GetSystemMetrics, GetWindowPlacement,
     GetWindowRect, IsIconic, ShowCursor, IDC_APPSTARTING, IDC_ARROW, IDC_CROSS, IDC_HAND, IDC_HELP,
@@ -254,6 +254,8 @@ pub type GetPointerDeviceRects = unsafe extern "system" fn(
 
 pub type GetPointerTouchInfo =
     unsafe extern "system" fn(pointer_id: u32, touch_info: *mut POINTER_TOUCH_INFO) -> BOOL;
+pub type GetPointerPenInfo =
+    unsafe extern "system" fn(pointer_id: u32, pen_info: *mut POINTER_PEN_INFO) -> BOOL;
 
 pub(crate) static WIN10_BUILD_VERSION: LazyLock<Option<u32>> = LazyLock::new(|| {
     type RtlGetVersion = unsafe extern "system" fn(*mut OSVERSIONINFOW) -> NTSTATUS;
@@ -306,6 +308,8 @@ pub(crate) static GET_POINTER_DEVICE_RECTS: LazyLock<Option<GetPointerDeviceRect
     LazyLock::new(|| get_function!("user32.dll", GetPointerDeviceRects));
 pub(crate) static GET_POINTER_TOUCH_INFO: LazyLock<Option<GetPointerTouchInfo>> =
     LazyLock::new(|| get_function!("user32.dll", GetPointerTouchInfo));
+pub(crate) static GET_POINTER_PEN_INFO: LazyLock<Option<GetPointerPenInfo>> =
+    LazyLock::new(|| get_function!("user32.dll", GetPointerPenInfo));
 
 pub(crate) fn wrap_device_id(id: u32) -> DeviceId {
     DeviceId::from_raw(id as i64)

winit-win32/src/window.rs

@@ -1263,6 +1263,7 @@ impl InitData<'_> {
             _file_drop_handler: file_drop_handler,
             userdata_removed: Cell::new(false),
             recurse_depth: Cell::new(0),
+            last_tablet_down_button_state: Cell::new(0),
         }
     }
 

winit-x11/src/atoms.rs

@@ -103,7 +103,14 @@ atom_manager! {
     _NET_SUPPORTED,
     _NET_SUPPORTING_WM_CHECK,
     _XEMBED,
-    _XSETTINGS_SETTINGS
+    _XSETTINGS_SETTINGS,
+
+    // Stylus Atoms
+    ABS_X: b"Abs X",
+    ABS_Y: b"Abs Y",
+    ABS_PRESSURE: b"Abs Pressure",
+    ABS_TILT_X: b"Abs Tilt X",
+    ABS_TILT_Y: b"Abs Tilt Y"
 }
 
 impl Index<AtomName> for Atoms {

winit-x11/src/event_loop.rs

@@ -1006,6 +1006,15 @@ pub struct Device {
     // For master devices, this is the paired device (pointer <-> keyboard).
     // For slave devices, this is the master.
     pub(crate) attachment: c_int,
+    pub(crate) r#type: DeviceType,
+}
+
+#[derive(Clone, Copy, Debug)]
+pub(crate) enum DeviceType {
+    Mouse,
+    Touch,
+    Pen,
+    Eraser,
 }
 
 #[derive(Debug, Copy, Clone)]
@@ -1022,9 +1031,10 @@ pub(crate) enum ScrollOrientation {
 }
 
 impl Device {
-    pub(crate) fn new(info: &ffi::XIDeviceInfo) -> Self {
+    pub(crate) fn new(info: &ffi::XIDeviceInfo, atoms: &Atoms) -> Self {
         let name = unsafe { CStr::from_ptr(info.name).to_string_lossy() };
         let mut scroll_axes = Vec::new();
+        let mut r#type = None;
 
         if Device::physical_device(info) {
             // Identify scroll axes
@@ -1041,12 +1051,34 @@ impl Device {
                         },
                         position: 0.0,
                     }));
+                } else if ty == ffi::XITouchClass {
+                    r#type = Some(DeviceType::Touch);
+                } else if r#type.is_none() && ty == ffi::XIValuatorClass {
+                    let info = unsafe { &*(class_ptr as *const ffi::XIValuatorClassInfo) };
+                    let atom = info.label as xproto::Atom;
+
+                    if atom == atoms[ABS_X]
+                        || atom == atoms[ABS_Y]
+                        || atom == atoms[ABS_PRESSURE]
+                        || atom == atoms[ABS_TILT_X]
+                        || atom == atoms[ABS_TILT_Y]
+                    {
+                        if name.contains("eraser") {
+                            r#type = Some(DeviceType::Eraser);
+                        } else {
+                            r#type = Some(DeviceType::Pen);
+                        }
+                    }
                 }
             }
         }
 
-        let mut device =
-            Device { _name: name.into_owned(), scroll_axes, attachment: info.attachment };
+        let mut device = Device {
+            _name: name.into_owned(),
+            scroll_axes,
+            attachment: info.attachment,
+            r#type: r#type.unwrap_or(DeviceType::Mouse),
+        };
         device.reset_scroll_position(info);
         device
     }

winit-x11/src/event_processor.rs

@@ -33,8 +33,8 @@ use xkbcommon_dl::xkb_mod_mask_t;
 use crate::atoms::*;
 use crate::dnd::{Dnd, DndState};
 use crate::event_loop::{
-    mkdid, mkwid, ActiveEventLoop, CookieResultExt, Device, DeviceInfo, ScrollOrientation,
-    ALL_DEVICES,
+    mkdid, mkwid, ActiveEventLoop, CookieResultExt, Device, DeviceInfo, DeviceType,
+    ScrollOrientation, ALL_DEVICES,
 };
 use crate::ime::{ImeEvent, ImeEventReceiver, ImeReceiver, ImeRequest};
 use crate::util;
@@ -323,8 +323,10 @@ impl EventProcessor {
     pub fn init_device(&self, device: xinput::DeviceId) {
         let mut devices = self.devices.borrow_mut();
         if let Some(info) = DeviceInfo::get(&self.target.xconn, device as _) {
+            let atoms = self.target.x_connection().atoms();
+
             for info in info.iter() {
-                devices.insert(mkdid(info.deviceid as xinput::DeviceId), Device::new(info));
+                devices.insert(mkdid(info.deviceid as xinput::DeviceId), Device::new(info, atoms));
             }
         }
     }
@@ -974,6 +976,15 @@ impl EventProcessor {
         // Set the timestamp.
         self.target.xconn.set_timestamp(event.time as xproto::Timestamp);
 
+        let Some(DeviceType::Mouse) = self
+            .devices
+            .borrow()
+            .get(&mkdid(event.sourceid as xinput::DeviceId))
+            .map(|device| device.r#type)
+        else {
+            return;
+        };
+
         // Deliver multi-touch events instead of emulated mouse events.
         if (event.flags & xinput2::XIPointerEmulated) != 0 {
             return;
@@ -1051,6 +1062,15 @@ impl EventProcessor {
         // Set the timestamp.
         self.target.xconn.set_timestamp(event.time as xproto::Timestamp);
 
+        let Some(DeviceType::Mouse) = self
+            .devices
+            .borrow()
+            .get(&mkdid(event.sourceid as xinput::DeviceId))
+            .map(|device| device.r#type)
+        else {
+            return;
+        };
+
         let device_id = Some(mkdid(event.deviceid as xinput::DeviceId));
         let window = event.event as xproto::Window;
         let window_id = mkwid(window);
@@ -1376,7 +1396,6 @@ impl EventProcessor {
         self.target.xconn.set_timestamp(xev.time as xproto::Timestamp);
 
         let did = Some(mkdid(xev.deviceid as xinput::DeviceId));
-
         let mask =
             unsafe { slice::from_raw_parts(xev.valuators.mask, xev.valuators.mask_len as usize) };
         let mut value = xev.raw_values;
@@ -1401,6 +1420,15 @@ impl EventProcessor {
             value = unsafe { value.offset(1) };
         }
 
+        let Some(DeviceType::Mouse) = self
+            .devices
+            .borrow()
+            .get(&mkdid(xev.sourceid as xinput::DeviceId))
+            .map(|device| device.r#type)
+        else {
+            return;
+        };
+
         if let Some(mouse_delta) = mouse_delta.consume() {
             app.device_event(&self.target, did, DeviceEvent::PointerMotion { delta: mouse_delta });
         }

winit/docs/ATTRIBUTION.md

@@ -8,3 +8,10 @@ These files are created by [Mads Marquart](https://github.com/madsmtm) using
 [draw.io](https://draw.io/), and compressed using [svgomg.net](https://svgomg.net/).
 
 They are licensed under the [CC-BY 4.0](https://creativecommons.org/licenses/by/4.0/) license.
+
+## tool_*.webp
+
+These files are converted versions of
+[W3C Pointer Events spec images](https://github.com/w3c/pointerevents/tree/93938ae7fe0172e2ae7587ad7d7c4fc8562d7153/images)
+by [patrickhlauke](https://github.com/patrickhlauke). It is licensed under the
+[W3C Software and Document License](https://www.w3.org/copyright/software-license).

winit/src/changelog/unreleased.md

@@ -87,6 +87,7 @@ changelog entry.
 - Add `Ime::DeleteSurrounding` to let the input method delete text.
 - Add more `ImePurpose` values.
 - Add `ImeHints` to request particular IME behaviour.
+- Add Pen input support on Wayland, Windows, and Web via new Pointer event.
 
 ### Changed
 
@@ -210,6 +211,7 @@ changelog entry.
 - Move `EventLoopExtRunOnDemand` from platform module to `winit::event_loop::run_on_demand`.
 - Use `NamedKey`, `Code` and `Location` from the `keyboard-types` v0.8 crate.
 - Deprecate `Window::set_ime_allowed`, `Window::set_ime_cursor_area`, and `Window::set_ime_purpose`.
+- `Force::normalized()` now takes a `Option<ToolAngle>` to calculate the perpendicular force.
 
 ### Removed
 
@@ -249,6 +251,7 @@ changelog entry.
 - Remove `NamedKey::Space`, match on `Key::Character(" ")` instead.
 - Remove `PartialEq` impl for `WindowAttributes`.
 - `WindowAttributesExt*` platform extensions; use `WindowAttributes*` instead.
+- Remove `Force::Calibrated::altitude_angle` in favor of `ToolAngle::altitude`.
 
 ### Fixed
 
@@ -264,3 +267,4 @@ changelog entry.
 - On Windows, `Window::theme` will return the correct theme after setting it through `Window::set_theme`.
 - On Windows, `Window::set_theme` will change the title bar color immediately now.
 - On Windows 11, prevent incorrect shifting when dragging window onto a monitor with different DPI.
+- On Web, device events are emitted regardless of cursor type.