we did it bois (#1352)

* In `WindowBuilderExtUnix` methods, use `Size` instead of `LogicalSize`

.github/workflows/ci.yml

@@ -0,0 +1,107 @@
+name: CI
+
+on:
+  pull_request:
+    paths:
+      - '**.rs'
+      - '**.toml'
+      - '.github/workflows/ci.yml'
+  push:
+    branches: [master]
+    paths:
+      - '**.rs'
+      - '**.toml'
+      - '.github/workflows/ci.yml'
+
+jobs:
+  Check_Formatting:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - uses: hecrj/setup-rust-action@v1
+      with:
+        rust-version: stable
+        components: rustfmt
+    - name: Check Formatting
+      run: cargo +stable fmt --all -- --check
+
+  Tests:
+    strategy:
+      fail-fast: false
+      matrix:
+        rust_version: [stable, nightly]
+        platform:
+          - { target: x86_64-pc-windows-msvc,   os: windows-latest,  }
+          - { target: i686-pc-windows-msvc,     os: windows-latest,  }
+          - { target: x86_64-pc-windows-gnu,    os: windows-latest, host: -x86_64-pc-windows-gnu }
+          - { target: i686-pc-windows-gnu,      os: windows-latest, host: -i686-pc-windows-gnu }
+          - { target: i686-unknown-linux-gnu,   os: ubuntu-latest,   }
+          - { target: x86_64-unknown-linux-gnu, os: ubuntu-latest,   }
+          - { target: x86_64-apple-darwin,      os: macos-latest,    }
+          - { target: x86_64-apple-ios,         os: macos-latest,    }
+          - { target: armv7-apple-ios,          os: macos-latest,    }
+          - { target: aarch64-apple-ios,        os: macos-latest,    }
+          # We're using Windows rather than Ubuntu to run the wasm tests because caching cargo-web
+          # doesn't currently work on Linux.
+          - { target: wasm32-unknown-unknown,   os: windows-latest, features: stdweb,  web: web }
+          - { target: wasm32-unknown-unknown,   os: windows-latest, features: web-sys, web: web }
+
+    env:
+      RUST_BACKTRACE: 1
+      CARGO_INCREMENTAL: 0
+      RUSTFLAGS: "-C debuginfo=0"
+      FEATURES: ${{ format(',{0}', matrix.platform.features ) }}
+      WEB: ${{ matrix.platform.web }}
+
+    runs-on: ${{ matrix.platform.os }}
+    steps:
+    - uses: actions/checkout@v1
+    # Used to cache cargo-web
+    - name: Cache cargo folder
+      uses: actions/cache@v1
+      with:
+        path: ~/.cargo
+        key: ${{ matrix.platform.target }}-cargo-${{ matrix.rust_version }}
+
+    - uses: hecrj/setup-rust-action@v1
+      with:
+        rust-version: ${{ matrix.rust_version }}${{ matrix.platform.host }}
+        targets: ${{ matrix.platform.target }}
+
+    - name: Install GCC Multilib
+      if: (matrix.platform.os == 'ubuntu-latest') && contains(matrix.platform.target, 'i686')
+      run: sudo apt-get update && sudo apt-get install gcc-multilib
+    - name: Install cargo-web
+      continue-on-error: true
+      if: contains(matrix.platform.target, 'wasm32')
+      run: cargo install cargo-web
+
+    - name: Check documentation
+      shell: bash
+      if: matrix.platform.target != 'wasm32-unknown-unknown'
+      run: cargo doc --no-deps --target ${{ matrix.platform.target }} --features $FEATURES
+
+    - name: Build
+      shell: bash
+      run: cargo $WEB build --verbose --target ${{ matrix.platform.target }} --features $FEATURES
+
+    - name: Build tests
+      shell: bash
+      run: cargo $WEB test --no-run --verbose --target ${{ matrix.platform.target }} --features $FEATURES
+    - name: Run tests
+      shell: bash
+      if: (!contains(matrix.platform.target, 'ios') && !contains(matrix.platform.target, 'wasm32'))
+      run: cargo $WEB test --verbose --target ${{ matrix.platform.target }} --features $FEATURES
+
+
+    - name: Build with serde enabled
+      shell: bash
+      run: cargo $WEB build --verbose --target ${{ matrix.platform.target }} --features serde,$FEATURES
+
+    - name: Build tests with serde enabled
+      shell: bash
+      run: cargo $WEB test --no-run --verbose --target ${{ matrix.platform.target }} --features serde,$FEATURES
+    - name: Run tests with serde enabled
+      shell: bash
+      if: (!contains(matrix.platform.target, 'ios') && !contains(matrix.platform.target, 'wasm32'))
+      run: cargo $WEB test --verbose --target ${{ matrix.platform.target }} --features serde,$FEATURES

.github/workflows/publish.yml

@@ -0,0 +1,18 @@
+name: Publish
+
+on:
+  push:
+    branches: [master]
+    paths: "Cargo.toml"
+
+jobs:
+  Publish:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - uses: hecrj/setup-rust-action@v1
+      with:
+        rust-version: stable
+        components: rustfmt
+    - name: Publish to crates.io
+      run: cargo publish --token ${{ secrets.cratesio_token }}

.travis.yml

@@ -1,104 +0,0 @@
-language: rust
-
-matrix:
-  include:
-    # Linux 32bit
-    - env: TARGET=i686-unknown-linux-gnu
-      os: linux
-      rust: nightly
-      addons:
-        apt:
-          # Cross compiler and cross compiled C libraries
-          packages: &i686_packages
-            - gcc-multilib
-    - env: TARGET=i686-unknown-linux-gnu
-      os: linux
-      rust: stable
-      addons:
-        apt:
-          packages: *i686_packages
-
-    # Linux 64bit
-    - env: TARGET=x86_64-unknown-linux-gnu
-      os: linux
-      rust: nightly
-    - env: TARGET=x86_64-unknown-linux-gnu
-      os: linux
-      rust: stable
-
-    # macOS
-    - env: TARGET=x86_64-apple-darwin
-      os: osx
-      rust: nightly
-    - env: TARGET=x86_64-apple-darwin
-      os: osx
-      rust: stable
-
-    # iOS x86_64
-    - env: TARGET=x86_64-apple-ios
-      os: osx
-      rust: nightly
-    - env: TARGET=x86_64-apple-ios
-      os: osx
-      rust: stable
-
-    # iOS armv7
-    - env: TARGET=armv7-apple-ios
-      os: osx
-      rust: nightly
-    - env: TARGET=armv7-apple-ios
-      os: osx
-      rust: stable
-
-    # iOS arm64
-    - env: TARGET=aarch64-apple-ios
-      os: osx
-      rust: nightly
-    - env: TARGET=aarch64-apple-ios
-      os: osx
-      rust: stable
-
-    # wasm stdweb
-    - env: TARGET=wasm32-unknown-unknown WEB=web FEATURES=stdweb
-      os: linux
-      rust: stable
-    - env: TARGET=wasm32-unknown-unknown WEB=web FEATURES=stdweb
-      os: linux
-      rust: nightly
-    # wasm web-sys
-    - env: TARGET=wasm32-unknown-unknown FEATURES=web-sys
-      os: linux
-      rust: stable
-    - env: TARGET=wasm32-unknown-unknown FEATURES=web-sys
-      os: linux
-      rust: nightly
-
-install:
-  - rustup self update
-  - rustup target add $TARGET; true
-  - rustup toolchain install stable
-  - rustup component add rustfmt --toolchain stable
-
-script:
-  - cargo +stable fmt --all -- --check
-  # Ensure that the documentation builds properly.
-  - cargo doc --no-deps
-  # Install cargo-web to build stdweb
-  - if [[ $WEB = "web" ]]; then cargo install -f cargo-web; fi
-  # Build without serde then with serde
-  - if [[ -z "$FEATURES" ]]; then
-      cargo $WEB build --target $TARGET --verbose;
-    else
-      cargo $WEB build --target $TARGET --features $FEATURES --verbose;
-    fi
-  - cargo $WEB build --target $TARGET --features serde,$FEATURES --verbose
-  # Running iOS apps on macOS requires the Simulator so we skip that for now
-  # The web targets also don't support running tests
-  - if [[ $TARGET != *-apple-ios && $TARGET != wasm32-* ]]; then cargo test --target $TARGET --verbose; fi
-  - if [[ $TARGET != *-apple-ios && $TARGET != wasm32-* ]]; then cargo test --target $TARGET --features serde --verbose; fi
-
-after_success:
-  - |
-      [ $TRAVIS_BRANCH = master ] &&
-      [ $TRAVIS_PULL_REQUEST = false ] &&
-      cargo publish --token ${CRATESIO_TOKEN}

CHANGELOG.md

@@ -1,5 +1,17 @@
 # Unreleased
 
+# 0.20.0 (2020-01-05)
+
+- On X11, fix `ModifiersChanged` emitting incorrect modifier change events
+- **Breaking**: Overhaul how Winit handles DPI:
+  + Window functions and events now return `PhysicalSize` instead of `LogicalSize`.
+  + Functions that take `Size` or `Position` types can now take either `Logical` or `Physical` types.
+  + `hidpi_factor` has been renamed to `scale_factor`.
+  + `HiDpiFactorChanged` has been renamed to `ScaleFactorChanged`, and lets you control how the OS
+    resizes the window in response to the change.
+  + On X11, deprecate `WINIT_HIDPI_FACTOR` environment variable in favor of `WINIT_X11_SCALE_FACTOR`.
+  + `Size` and `Position` types are now generic over their exact pixel type.
+
 # 0.20.0 Alpha 6 (2020-01-03)
 
 - On macOS, fix `set_cursor_visible` hides cursor outside of window.
@@ -89,6 +101,7 @@
     reduces the potential for cross-platform compatibility gotchyas.
 - On Windows and Linux X11/Wayland, add platform-specific functions for creating an `EventLoop` outside the main thread.
 - On Wayland, drop resize events identical to the current window size.
+- On Windows, fix window rectangle not getting set correctly on high-DPI systems.
 
 # 0.20.0 Alpha 3 (2019-08-14)
 

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "winit"
-version = "0.20.0-alpha6"
+version = "0.20.0"
 authors = ["The winit contributors", "Pierre Krieger <pierre.krieger1708@gmail.com>"]
 description = "Cross-platform window creation library."
 edition = "2018"
@@ -42,7 +42,7 @@ cocoa = "0.19.1"
 core-foundation = "0.6"
 core-graphics = "0.17.3"
 dispatch = "0.1.4"
-objc = "0.2.3"
+objc = "0.2.6"
 
 [target.'cfg(target_os = "macos")'.dependencies.core-video-sys]
 version = "0.1.3"
@@ -75,7 +75,8 @@ features = [
 
 [target.'cfg(any(target_os = "linux", target_os = "dragonfly", target_os = "freebsd", target_os = "openbsd", target_os = "netbsd"))'.dependencies]
 wayland-client = { version = "0.23.0", features = [ "dlopen", "egl", "cursor", "eventloop"] }
-calloop = "0.4.2"
+mio = "0.6"
+mio-extras = "2.0"
 smithay-client-toolkit = "0.6"
 x11-dl = "2.18.3"
 percent-encoding = "2.0"
@@ -89,6 +90,7 @@ version = "0.3.22"
 optional = true
 features = [
     'console',
+    'CssStyleDeclaration',
     'BeforeUnloadEvent',
     'Document',
     'DomRect',

README.md

@@ -7,7 +7,7 @@
 
 ```toml
 [dependencies]
-winit = "0.20.0-alpha6"
+winit = "0.20.0"
 ```
 
 ## [Documentation](https://docs.rs/winit)

appveyor.yml

@@ -1,35 +0,0 @@
-environment:
-  matrix:
-  - TARGET: x86_64-pc-windows-msvc
-    CHANNEL: stable
-  - TARGET: i686-pc-windows-msvc
-    CHANNEL: stable
-  - TARGET: x86_64-pc-windows-gnu
-    CHANNEL: stable
-  - TARGET: i686-pc-windows-gnu
-    CHANNEL: stable
-  - TARGET: x86_64-pc-windows-msvc
-    CHANNEL: nightly
-  - TARGET: i686-pc-windows-msvc
-    CHANNEL: nightly
-  - TARGET: x86_64-pc-windows-gnu
-    CHANNEL: nightly
-  - TARGET: i686-pc-windows-gnu
-    CHANNEL: nightly
-matrix:
-  allow_failures:
-    - CHANNEL: nightly
-install:
-  - appveyor DownloadFile https://win.rustup.rs/ -FileName rustup-init.exe
-  - rustup-init -yv --default-toolchain %CHANNEL% --default-host %TARGET%
-  - SET PATH=%PATH%;%USERPROFILE%\.cargo\bin
-  - SET PATH=%PATH%;C:\MinGW\bin
-  - rustc -V
-  - cargo -V
-
-build: false
-
-test_script:
-  - cargo test --verbose
-  - cargo test --features serde --verbose
-  - cargo doc --no-deps

examples/cursor.rs

@@ -12,35 +12,39 @@ fn main() {
 
     let mut cursor_idx = 0;
 
-    event_loop.run(move |event, _, control_flow| match event {
-        Event::WindowEvent {
-            event:
-                WindowEvent::KeyboardInput {
-                    input:
-                        KeyboardInput {
-                            state: ElementState::Pressed,
-                            ..
-                        },
-                    ..
-                },
-            ..
-        } => {
-            println!("Setting cursor to \"{:?}\"", CURSORS[cursor_idx]);
-            window.set_cursor_icon(CURSORS[cursor_idx]);
-            if cursor_idx < CURSORS.len() - 1 {
-                cursor_idx += 1;
-            } else {
-                cursor_idx = 0;
+    event_loop.run(move |event, _, control_flow| {
+        *control_flow = ControlFlow::Wait;
+
+        match event {
+            Event::WindowEvent {
+                event:
+                    WindowEvent::KeyboardInput {
+                        input:
+                            KeyboardInput {
+                                state: ElementState::Pressed,
+                                ..
+                            },
+                        ..
+                    },
+                ..
+            } => {
+                println!("Setting cursor to \"{:?}\"", CURSORS[cursor_idx]);
+                window.set_cursor_icon(CURSORS[cursor_idx]);
+                if cursor_idx < CURSORS.len() - 1 {
+                    cursor_idx += 1;
+                } else {
+                    cursor_idx = 0;
+                }
             }
+            Event::WindowEvent {
+                event: WindowEvent::CloseRequested,
+                ..
+            } => {
+                *control_flow = ControlFlow::Exit;
+                return;
+            }
+            _ => (),
         }
-        Event::WindowEvent {
-            event: WindowEvent::CloseRequested,
-            ..
-        } => {
-            *control_flow = ControlFlow::Exit;
-            return;
-        }
-        _ => (),
     });
 }
 

examples/cursor_grab.rs

@@ -16,6 +16,7 @@ fn main() {
 
     event_loop.run(move |event, _, control_flow| {
         *control_flow = ControlFlow::Wait;
+
         match event {
             Event::WindowEvent { event, .. } => match event {
                 WindowEvent::CloseRequested => *control_flow = ControlFlow::Exit,

examples/custom_events.rs

@@ -31,13 +31,17 @@ fn main() {
         }
     });
 
-    event_loop.run(move |event, _, control_flow| match event {
-        Event::UserEvent(event) => println!("user event: {:?}", event),
-        Event::WindowEvent {
-            event: WindowEvent::CloseRequested,
-            ..
-        } => *control_flow = ControlFlow::Exit,
-        _ => *control_flow = ControlFlow::Wait,
+    event_loop.run(move |event, _, control_flow| {
+        *control_flow = ControlFlow::Wait;
+
+        match event {
+            Event::UserEvent(event) => println!("user event: {:?}", event),
+            Event::WindowEvent {
+                event: WindowEvent::CloseRequested,
+                ..
+            } => *control_flow = ControlFlow::Exit,
+            _ => (),
+        }
     });
 }
 

examples/min_max_size.rs

@@ -14,6 +14,7 @@ fn main() {
     window.set_max_inner_size(Some(LogicalSize::new(800.0, 400.0)));
 
     event_loop.run(move |event, _, control_flow| {
+        *control_flow = ControlFlow::Wait;
         println!("{:?}", event);
 
         match event {
@@ -21,7 +22,7 @@ fn main() {
                 event: WindowEvent::CloseRequested,
                 ..
             } => *control_flow = ControlFlow::Exit,
-            _ => *control_flow = ControlFlow::Wait,
+            _ => (),
         }
     });
 }

examples/minimize.rs

@@ -12,24 +12,28 @@ fn main() {
         .build(&event_loop)
         .unwrap();
 
-    event_loop.run(move |event, _, control_flow| match event {
-        Event::WindowEvent {
-            event: WindowEvent::CloseRequested,
-            ..
-        } => *control_flow = ControlFlow::Exit,
+    event_loop.run(move |event, _, control_flow| {
+        *control_flow = ControlFlow::Wait;
 
-        // Keyboard input event to handle minimize via a hotkey
-        Event::WindowEvent {
-            event: WindowEvent::KeyboardInput { input, .. },
-            window_id,
-        } => {
-            if window_id == window.id() {
-                // Pressing the 'M' key will minimize the window
-                if input.virtual_keycode == Some(VirtualKeyCode::M) {
-                    window.set_minimized(true);
+        match event {
+            Event::WindowEvent {
+                event: WindowEvent::CloseRequested,
+                ..
+            } => *control_flow = ControlFlow::Exit,
+
+            // Keyboard input event to handle minimize via a hotkey
+            Event::WindowEvent {
+                event: WindowEvent::KeyboardInput { input, .. },
+                window_id,
+            } => {
+                if window_id == window.id() {
+                    // Pressing the 'M' key will minimize the window
+                    if input.virtual_keycode == Some(VirtualKeyCode::M) {
+                        window.set_minimized(true);
+                    }
                 }
             }
+            _ => (),
         }
-        _ => *control_flow = ControlFlow::Wait,
     });
 }

examples/multithreaded.rs

@@ -5,20 +5,21 @@ fn main() {
     use std::{collections::HashMap, sync::mpsc, thread, time::Duration};
 
     use winit::{
+        dpi::{PhysicalPosition, PhysicalSize, Position, Size},
         event::{ElementState, Event, KeyboardInput, VirtualKeyCode, WindowEvent},
         event_loop::{ControlFlow, EventLoop},
         window::{CursorIcon, Fullscreen, WindowBuilder},
     };
 
     const WINDOW_COUNT: usize = 3;
-    const WINDOW_SIZE: (u32, u32) = (600, 400);
+    const WINDOW_SIZE: PhysicalSize<u32> = PhysicalSize::new(600, 400);
 
     env_logger::init();
     let event_loop = EventLoop::new();
     let mut window_senders = HashMap::with_capacity(WINDOW_COUNT);
     for _ in 0..WINDOW_COUNT {
         let window = WindowBuilder::new()
-            .with_inner_size(WINDOW_SIZE.into())
+            .with_inner_size(WINDOW_SIZE)
             .build(&event_loop)
             .unwrap();
 
@@ -49,6 +50,7 @@ fn main() {
                             );
                         }
                     }
+                    #[allow(deprecated)]
                     WindowEvent::KeyboardInput {
                         input:
                             KeyboardInput {
@@ -101,31 +103,38 @@ fn main() {
                                 println!("-> fullscreen     : {:?}", window.fullscreen());
                             }
                             L => window.set_min_inner_size(match state {
-                                true => Some(WINDOW_SIZE.into()),
+                                true => Some(WINDOW_SIZE),
                                 false => None,
                             }),
                             M => window.set_maximized(state),
                             P => window.set_outer_position({
                                 let mut position = window.outer_position().unwrap();
-                                let sign = if state { 1.0 } else { -1.0 };
-                                position.x += 10.0 * sign;
-                                position.y += 10.0 * sign;
+                                let sign = if state { 1 } else { -1 };
+                                position.x += 10 * sign;
+                                position.y += 10 * sign;
                                 position
                             }),
                             Q => window.request_redraw(),
                             R => window.set_resizable(state),
-                            S => window.set_inner_size(
-                                match state {
-                                    true => (WINDOW_SIZE.0 + 100, WINDOW_SIZE.1 + 100),
-                                    false => WINDOW_SIZE,
+                            S => window.set_inner_size(match state {
+                                true => PhysicalSize::new(
+                                    WINDOW_SIZE.width + 100,
+                                    WINDOW_SIZE.height + 100,
+                                ),
+                                false => WINDOW_SIZE,
+                            }),
+                            W => {
+                                if let Size::Physical(size) = WINDOW_SIZE.into() {
+                                    window
+                                        .set_cursor_position(Position::Physical(
+                                            PhysicalPosition::new(
+                                                size.width as i32 / 2,
+                                                size.height as i32 / 2,
+                                            ),
+                                        ))
+                                        .unwrap()
                                 }
-                                .into(),
-                            ),
-                            W => window
-                                .set_cursor_position(
-                                    (WINDOW_SIZE.0 as i32 / 2, WINDOW_SIZE.1 as i32 / 2).into(),
-                                )
-                                .unwrap(),
+                            }
                             Z => {
                                 window.set_visible(false);
                                 thread::sleep(Duration::from_secs(1));
@@ -161,7 +170,9 @@ fn main() {
                 }
                 _ => {
                     if let Some(tx) = window_senders.get(&window_id) {
-                        tx.send(event).unwrap();
+                        if let Some(event) = event.to_static() {
+                            tx.send(event).unwrap();
+                        }
                     }
                 }
             },

examples/multiwindow.rs

@@ -16,6 +16,7 @@ fn main() {
 
     event_loop.run(move |event, event_loop, control_flow| {
         *control_flow = ControlFlow::Wait;
+
         match event {
             Event::WindowEvent { event, window_id } => {
                 match event {

examples/request_redraw.rs

@@ -1,8 +1,5 @@
-use instant::Instant;
-use std::time::Duration;
-
 use winit::{
-    event::{Event, WindowEvent},
+    event::{ElementState, Event, WindowEvent},
     event_loop::{ControlFlow, EventLoop},
     window::WindowBuilder,
 };
@@ -15,18 +12,26 @@ fn main() {
         .build(&event_loop)
         .unwrap();
 
-    event_loop.run(move |event, _, control_flow| match event {
-        Event::WindowEvent {
-            event: WindowEvent::CloseRequested,
-            ..
-        } => *control_flow = ControlFlow::Exit,
-        Event::MainEventsCleared => {
-            window.request_redraw();
-            *control_flow = ControlFlow::WaitUntil(Instant::now() + Duration::new(1, 0))
+    event_loop.run(move |event, _, control_flow| {
+        println!("{:?}", event);
+
+        *control_flow = ControlFlow::Wait;
+
+        match event {
+            Event::WindowEvent { event, .. } => match event {
+                WindowEvent::CloseRequested => *control_flow = ControlFlow::Exit,
+                WindowEvent::MouseInput {
+                    state: ElementState::Released,
+                    ..
+                } => {
+                    window.request_redraw();
+                }
+                _ => (),
+            },
+            Event::RedrawRequested(_) => {
+                println!("\nredrawing!\n");
+            }
+            _ => (),
         }
-        Event::RedrawRequested(_) => {
-            println!("{:?}", event);
-        }
-        _ => (),
     });
 }

examples/resizable.rs

@@ -1,4 +1,5 @@
 use winit::{
+    dpi::LogicalSize,
     event::{ElementState, Event, KeyboardInput, VirtualKeyCode, WindowEvent},
     event_loop::{ControlFlow, EventLoop},
     window::WindowBuilder,
@@ -11,13 +12,14 @@ fn main() {
 
     let window = WindowBuilder::new()
         .with_title("Hit space to toggle resizability.")
-        .with_inner_size((400, 200).into())
+        .with_inner_size(LogicalSize::new(400.0, 200.0))
         .with_resizable(resizable)
         .build(&event_loop)
         .unwrap();
 
     event_loop.run(move |event, _, control_flow| {
         *control_flow = ControlFlow::Wait;
+
         match event {
             Event::WindowEvent { event, .. } => match event {
                 WindowEvent::CloseRequested => *control_flow = ControlFlow::Exit,

examples/transparent.rs

@@ -16,6 +16,7 @@ fn main() {
     window.set_title("A fantastic window!");
 
     event_loop.run(move |event, _, control_flow| {
+        *control_flow = ControlFlow::Wait;
         println!("{:?}", event);
 
         match event {
@@ -23,7 +24,7 @@ fn main() {
                 event: WindowEvent::CloseRequested,
                 ..
             } => *control_flow = ControlFlow::Exit,
-            _ => *control_flow = ControlFlow::Wait,
+            _ => (),
         }
     });
 }

examples/web.rs

@@ -40,6 +40,8 @@ pub fn main() {
     }
 
     event_loop.run(move |event, _, control_flow| {
+        *control_flow = ControlFlow::Wait;
+
         #[cfg(feature = "web-sys")]
         log::debug!("{:?}", event);
 
@@ -54,7 +56,7 @@ pub fn main() {
             Event::MainEventsCleared => {
                 window.request_redraw();
             }
-            _ => *control_flow = ControlFlow::Wait,
+            _ => (),
         }
     });
 }

examples/window.rs

@@ -9,10 +9,12 @@ fn main() {
 
     let window = WindowBuilder::new()
         .with_title("A fantastic window!")
+        .with_inner_size(winit::dpi::LogicalSize::new(128.0, 128.0))
         .build(&event_loop)
         .unwrap();
 
     event_loop.run(move |event, _, control_flow| {
+        *control_flow = ControlFlow::Wait;
         println!("{:?}", event);
 
         match event {
@@ -23,7 +25,7 @@ fn main() {
             Event::MainEventsCleared => {
                 window.request_redraw();
             }
-            _ => *control_flow = ControlFlow::Poll,
+            _ => (),
         }
     });
 }

examples/window_debug.rs

@@ -12,20 +12,18 @@ fn main() {
 
     let window = WindowBuilder::new()
         .with_title("A fantastic window!")
-        .with_inner_size(LogicalSize::from((100, 100)))
+        .with_inner_size(LogicalSize::new(100.0, 100.0))
         .build(&event_loop)
         .unwrap();
 
     eprintln!("debugging keys:");
     eprintln!("  (E) Enter exclusive fullscreen");
     eprintln!("  (F) Toggle borderless fullscreen");
-    #[cfg(waiting_for_set_minimized)]
     eprintln!("  (M) Toggle minimized");
     eprintln!("  (Q) Quit event loop");
     eprintln!("  (V) Toggle visibility");
     eprintln!("  (X) Toggle maximized");
 
-    #[cfg(waiting_for_set_minimized)]
     let mut minimized = false;
     let mut maximized = false;
     let mut visible = true;
@@ -43,7 +41,6 @@ fn main() {
                     }),
                 ..
             } => match key {
-                #[cfg(waiting_for_set_minimized)]
                 VirtualKeyCode::M => {
                     if minimized {
                         minimized = !minimized;
@@ -68,16 +65,15 @@ fn main() {
                     ..
                 } => match key {
                     VirtualKeyCode::E => {
-                        fn area(size: PhysicalSize) -> f64 {
+                        fn area(size: PhysicalSize<u32>) -> u32 {
                             size.width * size.height
                         }
 
                         let monitor = window.current_monitor();
-                        if let Some(mode) = monitor.video_modes().max_by(|a, b| {
-                            area(a.size())
-                                .partial_cmp(&area(b.size()))
-                                .expect("NaN in video mode size")
-                        }) {
+                        if let Some(mode) = monitor
+                            .video_modes()
+                            .max_by(|a, b| area(a.size()).cmp(&area(b.size())))
+                        {
                             window.set_fullscreen(Some(Fullscreen::Exclusive(mode)));
                         } else {
                             eprintln!("no video modes available");
@@ -91,7 +87,6 @@ fn main() {
                             window.set_fullscreen(Some(Fullscreen::Borderless(monitor)));
                         }
                     }
-                    #[cfg(waiting_for_set_minimized)]
                     VirtualKeyCode::M => {
                         minimized = !minimized;
                         window.set_minimized(minimized);

examples/window_icon.rs

@@ -27,6 +27,7 @@ fn main() {
 
     event_loop.run(move |event, _, control_flow| {
         *control_flow = ControlFlow::Wait;
+
         if let Event::WindowEvent { event, .. } = event {
             use winit::event::WindowEvent::*;
             match event {

examples/window_run_return.rs

@@ -38,7 +38,6 @@ fn main() {
                     ..
                 } => {
                     quit = true;
-                    *control_flow = ControlFlow::Exit;
                 }
                 Event::MainEventsCleared => {
                     *control_flow = ControlFlow::Exit;
@@ -48,6 +47,7 @@ fn main() {
         });
 
         // Sleep for 1/60 second to simulate rendering
+        println!("rendering");
         sleep(Duration::from_millis(16));
     }
 }

src/dpi.rs

@@ -1,331 +1,498 @@
-//! DPI is important, so read the docs for this module if you don't want to be confused.
+//! UI scaling is important, so read the docs for this module if you don't want to be confused.
 //!
-//! Originally, `winit` dealt entirely in physical pixels (excluding unintentional inconsistencies), but now all
-//! window-related functions both produce and consume logical pixels. Monitor-related functions still use physical
-//! pixels, as do any context-related functions in `glutin`.
+//! ## Why should I care about UI scaling?
 //!
-//! If you've never heard of these terms before, then you're not alone, and this documentation will explain the
-//! concepts.
+//! Modern computer screens don't have a consistent relationship between resolution and size.
+//! 1920x1080 is a common resolution for both desktop and mobile screens, despite mobile screens
+//! normally being less than a quarter the size of their desktop counterparts. What's more, neither
+//! desktop nor mobile screens are consistent resolutions within their own size classes - common
+//! mobile screens range from below 720p to above 1440p, and desktop screens range from 720p to 5K
+//! and beyond.
 //!
-//! Modern screens have a defined physical resolution, most commonly 1920x1080. Indepedent of that is the amount of
-//! space the screen occupies, which is to say, the height and width in millimeters. The relationship between these two
-//! measurements is the *pixel density*. Mobile screens require a high pixel density, as they're held close to the
-//! eyes. Larger displays also require a higher pixel density, hence the growing presence of 1440p and 4K displays.
+//! Given that, it's a mistake to assume that 2D content will only be displayed on screens with
+//! a consistent pixel density. If you were to render a 96-pixel-square image on a 1080p screen,
+//! then render the same image on a similarly-sized 4K screen, the 4K rendition would only take up
+//! about a quarter of the physical space as it did on the 1080p screen. That issue is especially
+//! problematic with text rendering, where quarter-sized text becomes a significant legibility
+//! problem.
 //!
-//! So, this presents a problem. Let's say we want to render a square 100px button. It will occupy 100x100 of the
-//! screen's pixels, which in many cases, seems perfectly fine. However, because this size doesn't account for the
-//! screen's dimensions or pixel density, the button's size can vary quite a bit. On a 4K display, it would be unusably
-//! small.
+//! Failure to account for the scale factor can create a significantly degraded user experience.
+//! Most notably, it can make users feel like they have bad eyesight, which will potentially cause
+//! them to think about growing elderly, resulting in them having an existential crisis. Once users
+//! enter that state, they will no longer be focused on your application.
 //!
-//! That's a description of what happens when the button is 100x100 *physical* pixels. Instead, let's try using 100x100
-//! *logical* pixels. To map logical pixels to physical pixels, we simply multiply by the DPI (dots per inch) factor.
-//! On a "typical" desktop display, the DPI factor will be 1.0, so 100x100 logical pixels equates to 100x100 physical
-//! pixels. However, a 1440p display may have a DPI factor of 1.25, so the button is rendered as 125x125 physical pixels.
-//! Ideally, the button now has approximately the same perceived size across varying displays.
+//! ## How should I handle it?
 //!
-//! Failure to account for the DPI factor can create a badly degraded user experience. Most notably, it can make users
-//! feel like they have bad eyesight, which will potentially cause them to think about growing elderly, resulting in
-//! them entering an existential panic. Once users enter that state, they will no longer be focused on your application.
+//! The solution to this problem is to account for the device's *scale factor*. The scale factor is
+//! the factor UI elements should be scaled by to be consistent with the rest of the user's system -
+//! for example, a button that's normally 50 pixels across would be 100 pixels across on a device
+//! with a scale factor of `2.0`, or 75 pixels across with a scale factor of `1.5`.
 //!
-//! There are two ways to get the DPI factor:
-//! - You can track the [`HiDpiFactorChanged`](crate::event::WindowEvent::HiDpiFactorChanged) event of your
-//!   windows. This event is sent any time the DPI factor changes, either because the window moved to another monitor,
-//!   or because the user changed the configuration of their screen.
-//! - You can also retrieve the DPI factor of a monitor by calling
-//!   [`MonitorHandle::hidpi_factor`](crate::monitor::MonitorHandle::hidpi_factor), or the
-//!   current DPI factor applied to a window by calling
-//!   [`Window::hidpi_factor`](crate::window::Window::hidpi_factor), which is roughly equivalent
-//!   to `window.current_monitor().hidpi_factor()`.
+//! Many UI systems, such as CSS, expose DPI-dependent units like [points] or [picas]. That's
+//! usually a mistake, since there's no consistent mapping between the scale factor and the screen's
+//! actual DPI. Unless you're printing to a physical medium, you should work in scaled pixels rather
+//! than any DPI-dependent units.
 //!
-//! Depending on the platform, the window's actual DPI factor may only be known after
-//! the event loop has started and your window has been drawn once. To properly handle these cases,
-//! the most robust way is to monitor the [`HiDpiFactorChanged`](crate::event::WindowEvent::HiDpiFactorChanged)
-//! event and dynamically adapt your drawing logic to follow the DPI factor.
+//! ### Position and Size types
 //!
-//! Here's an overview of what sort of DPI factors you can expect, and where they come from:
-//! - **Windows:** On Windows 8 and 10, per-monitor scaling is readily configured by users from the display settings.
-//! While users are free to select any option they want, they're only given a selection of "nice" DPI factors, i.e.
-//! 1.0, 1.25, 1.5... on Windows 7, the DPI factor is global and changing it requires logging out.
-//! - **macOS:** The buzzword is "retina displays", which have a DPI factor of 2.0. Otherwise, the DPI factor is 1.0.
-//! Intermediate DPI factors are never used, thus 1440p displays/etc. aren't properly supported. It's possible for any
-//! display to use that 2.0 DPI factor, given the use of the command line.
-//! - **X11:** On X11, we calculate the DPI factor based on the millimeter dimensions provided by XRandR. This can
-//! result in a wide range of possible values, including some interesting ones like 1.0833333333333333. This can be
-//! overridden using the `WINIT_HIDPI_FACTOR` environment variable, though that's not recommended.
-//! - **Wayland:** On Wayland, DPI factors are set per-screen by the server, and are always integers (most often 1 or 2).
-//! - **iOS:** DPI factors are both constant and device-specific on iOS.
-//! - **Android:** This feature isn't yet implemented on Android, so the DPI factor will always be returned as 1.0.
-//! - **Web:** DPI factors are handled by the browser and will always be 1.0 for your application.
+//! Winit's `Physical(Position|Size)` types correspond with the actual pixels on the device, and the
+//! `Logical(Position|Size)` types correspond to the physical pixels divided by the scale factor.
+//! All of Winit's functions return physical types, but can take either logical or physical
+//! coordinates as input, allowing you to use the most convenient coordinate system for your
+//! particular application.
 //!
-//! The window's logical size is conserved across DPI changes, resulting in the physical size changing instead. This
-//! may be surprising on X11, but is quite standard elsewhere. Physical size changes always produce a
-//! [`Resized`](crate::event::WindowEvent::Resized) event, even on platforms where no resize actually occurs,
-//! such as macOS and Wayland. As a result, it's not necessary to separately handle
-//! [`HiDpiFactorChanged`](crate::event::WindowEvent::HiDpiFactorChanged) if you're only listening for size.
+//! Winit's position and size types types are generic over their exact pixel type, `P`, to allow the
+//! API to have integer precision where appropriate (e.g. most window manipulation functions) and
+//! floating precision when necessary (e.g. logical sizes for fractional scale factors and touch
+//! input). If `P` is a floating-point type, please do not cast the values with `as {int}`. Doing so
+//! will truncate the fractional part of the float, rather than properly round to the nearest
+//! integer. Use the provided `cast` function or `From`/`Into` conversions, which handle the
+//! rounding properly. Note that precision loss will still occur when rounding from a float to an
+//! int, although rounding lessens the problem.
 //!
-//! Your GPU has no awareness of the concept of logical pixels, and unless you like wasting pixel density, your
-//! framebuffer's size should be in physical pixels.
+//! ### Events
 //!
-//! `winit` will send [`Resized`](crate::event::WindowEvent::Resized) events whenever a window's logical size
-//! changes, and [`HiDpiFactorChanged`](crate::event::WindowEvent::HiDpiFactorChanged) events
-//! whenever the DPI factor changes. Receiving either of these events means that the physical size of your window has
-//! changed, and you should recompute it using the latest values you received for each. If the logical size and the
-//! DPI factor change simultaneously, `winit` will send both events together; thus, it's recommended to buffer
-//! these events and process them at the end of the queue.
+//! Winit will dispatch a [`ScaleFactorChanged`](crate::event::WindowEvent::ScaleFactorChanged)
+//! event whenever a window's scale factor has changed. This can happen if the user drags their
+//! window from a standard-resolution monitor to a high-DPI monitor, or if the user changes their
+//! DPI settings. This gives you a chance to rescale your application's UI elements and adjust how
+//! the platform changes the window's size to reflect the new scale factor. If a window hasn't
+//! received a [`ScaleFactorChanged`](crate::event::WindowEvent::ScaleFactorChanged) event,
+//! then its scale factor is `1.0`.
 //!
-//! If you never received any [`HiDpiFactorChanged`](crate::event::WindowEvent::HiDpiFactorChanged) events,
-//! then your window's DPI factor is 1.
+//! ## How is the scale factor calculated?
+//!
+//! Scale factor is calculated differently on different platforms:
+//!
+//! - **Windows:** On Windows 8 and 10, per-monitor scaling is readily configured by users from the
+//!   display settings. While users are free to select any option they want, they're only given a
+//!   selection of "nice" scale factors, i.e. 1.0, 1.25, 1.5... on Windows 7, the scale factor is
+//!   global and changing it requires logging out. See [this article][windows_1] for technical
+//!   details.
+//! - **macOS:** "retina displays" have a scale factor of 2.0. Otherwise, the scale factor is 1.0.
+//!   Intermediate scale factors are never used. It's possible for any display to use that 2.0 scale
+//!   factor, given the use of the command line.
+//! - **X11:** Many man-hours have been spent trying to figure out how to handle DPI in X11. Winit
+//!   currently uses a three-pronged approach:
+//!   + Use the value in the `WINIT_X11_SCALE_FACTOR` environment variable, if present.
+//!   + If not present, use the value set in `Xft.dpi` in Xresources.
+//!   + Otherwise, calcuate the scale factor based on the millimeter monitor dimensions provided by XRandR.
+//!
+//!   If `WINIT_X11_SCALE_FACTOR` is set to `randr`, it'll ignore the `Xft.dpi` field and use the
+//!   XRandR scaling method. Generally speaking, you should try to configure the standard system
+//!   variables to do what you want before resorting to `WINIT_X11_SCALE_FACTOR`.
+//! - **Wayland:** On Wayland, scale factors are set per-screen by the server, and are always
+//!   integers (most often 1 or 2).
+//! - **iOS:** Scale factors are set by Apple to the value that best suits the device, and range
+//!   from `1.0` to `3.0`. See [this article][apple_1] and [this article][apple_2] for more
+//!   information.
+//! - **Android:** Scale factors are set by the manufacturer to the value that best suits the
+//!   device, and range from `1.0` to `4.0`. See [this article][android_1] for more information.
+//! - **Web:** The scale factor is the ratio between CSS pixels and the physical device pixels.
+//!
+//! [points]: https://en.wikipedia.org/wiki/Point_(typography)
+//! [picas]: https://en.wikipedia.org/wiki/Pica_(typography)
+//! [windows_1]: https://docs.microsoft.com/en-us/windows/win32/hidpi/high-dpi-desktop-application-development-on-windows
+//! [apple_1]: https://developer.apple.com/library/archive/documentation/DeviceInformation/Reference/iOSDeviceCompatibility/Displays/Displays.html
+//! [apple_2]: https://developer.apple.com/design/human-interface-guidelines/macos/icons-and-images/image-size-and-resolution/
+//! [android_1]: https://developer.android.com/training/multiscreen/screendensities
 
-/// Checks that the DPI factor is a normal positive `f64`.
+pub trait Pixel: Copy + Into<f64> {
+    fn from_f64(f: f64) -> Self;
+    fn cast<P: Pixel>(self) -> P {
+        P::from_f64(self.into())
+    }
+}
+
+impl Pixel for u8 {
+    fn from_f64(f: f64) -> Self {
+        f.round() as u8
+    }
+}
+impl Pixel for u16 {
+    fn from_f64(f: f64) -> Self {
+        f.round() as u16
+    }
+}
+impl Pixel for u32 {
+    fn from_f64(f: f64) -> Self {
+        f.round() as u32
+    }
+}
+impl Pixel for i8 {
+    fn from_f64(f: f64) -> Self {
+        f.round() as i8
+    }
+}
+impl Pixel for i16 {
+    fn from_f64(f: f64) -> Self {
+        f.round() as i16
+    }
+}
+impl Pixel for i32 {
+    fn from_f64(f: f64) -> Self {
+        f.round() as i32
+    }
+}
+impl Pixel for f32 {
+    fn from_f64(f: f64) -> Self {
+        f as f32
+    }
+}
+impl Pixel for f64 {
+    fn from_f64(f: f64) -> Self {
+        f
+    }
+}
+
+/// Checks that the scale factor is a normal positive `f64`.
 ///
-/// All functions that take a DPI factor assert that this will return `true`. If you're sourcing DPI factors from
+/// All functions that take a scale factor assert that this will return `true`. If you're sourcing scale factors from
 /// anywhere other than winit, it's recommended to validate them using this function before passing them to winit;
 /// otherwise, you risk panics.
 #[inline]
-pub fn validate_hidpi_factor(dpi_factor: f64) -> bool {
+pub fn validate_scale_factor(dpi_factor: f64) -> bool {
     dpi_factor.is_sign_positive() && dpi_factor.is_normal()
 }
 
 /// A position represented in logical pixels.
 ///
-/// The position is stored as floats, so please be careful. Casting floats to integers truncates the fractional part,
-/// which can cause noticable issues. To help with that, an `Into<(i32, i32)>` implementation is provided which
-/// does the rounding for you.
+/// The position is stored as floats, so please be careful. Casting floats to integers truncates the
+/// fractional part, which can cause noticable issues. To help with that, an `Into<(i32, i32)>`
+/// implementation is provided which does the rounding for you.
 #[derive(Debug, Copy, Clone, PartialEq)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-pub struct LogicalPosition {
-    pub x: f64,
-    pub y: f64,
+pub struct LogicalPosition<P> {
+    pub x: P,
+    pub y: P,
 }
 
-impl LogicalPosition {
+impl<P> LogicalPosition<P> {
     #[inline]
-    pub fn new(x: f64, y: f64) -> Self {
+    pub const fn new(x: P, y: P) -> Self {
         LogicalPosition { x, y }
     }
+}
 
+impl<P: Pixel> LogicalPosition<P> {
     #[inline]
-    pub fn from_physical<T: Into<PhysicalPosition>>(physical: T, dpi_factor: f64) -> Self {
+    pub fn from_physical<T: Into<PhysicalPosition<X>>, X: Pixel>(
+        physical: T,
+        dpi_factor: f64,
+    ) -> Self {
         physical.into().to_logical(dpi_factor)
     }
 
     #[inline]
-    pub fn to_physical(&self, dpi_factor: f64) -> PhysicalPosition {
-        assert!(validate_hidpi_factor(dpi_factor));
-        let x = self.x * dpi_factor;
-        let y = self.y * dpi_factor;
-        PhysicalPosition::new(x, y)
+    pub fn to_physical<X: Pixel>(&self, dpi_factor: f64) -> PhysicalPosition<X> {
+        assert!(validate_scale_factor(dpi_factor));
+        let x = self.x.into() * dpi_factor;
+        let y = self.y.into() * dpi_factor;
+        PhysicalPosition::new(x, y).cast()
+    }
+
+    #[inline]
+    pub fn cast<X: Pixel>(&self) -> LogicalPosition<X> {
+        LogicalPosition {
+            x: self.x.cast(),
+            y: self.y.cast(),
+        }
     }
 }
 
-impl From<(f64, f64)> for LogicalPosition {
-    #[inline]
-    fn from((x, y): (f64, f64)) -> Self {
-        Self::new(x, y)
+impl<P: Pixel, X: Pixel> From<(X, X)> for LogicalPosition<P> {
+    fn from((x, y): (X, X)) -> LogicalPosition<P> {
+        LogicalPosition::new(x.cast(), y.cast())
     }
 }
 
-impl From<(i32, i32)> for LogicalPosition {
-    #[inline]
-    fn from((x, y): (i32, i32)) -> Self {
-        Self::new(x as f64, y as f64)
+impl<P: Pixel, X: Pixel> Into<(X, X)> for LogicalPosition<P> {
+    fn into(self: Self) -> (X, X) {
+        (self.x.cast(), self.y.cast())
     }
 }
 
-impl Into<(f64, f64)> for LogicalPosition {
-    #[inline]
-    fn into(self) -> (f64, f64) {
-        (self.x, self.y)
+impl<P: Pixel, X: Pixel> From<[X; 2]> for LogicalPosition<P> {
+    fn from([x, y]: [X; 2]) -> LogicalPosition<P> {
+        LogicalPosition::new(x.cast(), y.cast())
     }
 }
 
-impl Into<(i32, i32)> for LogicalPosition {
-    /// Note that this rounds instead of truncating.
-    #[inline]
-    fn into(self) -> (i32, i32) {
-        (self.x.round() as _, self.y.round() as _)
+impl<P: Pixel, X: Pixel> Into<[X; 2]> for LogicalPosition<P> {
+    fn into(self: Self) -> [X; 2] {
+        [self.x.cast(), self.y.cast()]
     }
 }
 
 /// A position represented in physical pixels.
-///
-/// The position is stored as floats, so please be careful. Casting floats to integers truncates the fractional part,
-/// which can cause noticable issues. To help with that, an `Into<(i32, i32)>` implementation is provided which
-/// does the rounding for you.
 #[derive(Debug, Copy, Clone, PartialEq)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-pub struct PhysicalPosition {
-    pub x: f64,
-    pub y: f64,
+pub struct PhysicalPosition<P> {
+    pub x: P,
+    pub y: P,
 }
 
-impl PhysicalPosition {
+impl<P> PhysicalPosition<P> {
     #[inline]
-    pub fn new(x: f64, y: f64) -> Self {
+    pub const fn new(x: P, y: P) -> Self {
         PhysicalPosition { x, y }
     }
+}
 
+impl<P: Pixel> PhysicalPosition<P> {
     #[inline]
-    pub fn from_logical<T: Into<LogicalPosition>>(logical: T, dpi_factor: f64) -> Self {
+    pub fn from_logical<T: Into<LogicalPosition<X>>, X: Pixel>(
+        logical: T,
+        dpi_factor: f64,
+    ) -> Self {
         logical.into().to_physical(dpi_factor)
     }
 
     #[inline]
-    pub fn to_logical(&self, dpi_factor: f64) -> LogicalPosition {
-        assert!(validate_hidpi_factor(dpi_factor));
-        let x = self.x / dpi_factor;
-        let y = self.y / dpi_factor;
-        LogicalPosition::new(x, y)
+    pub fn to_logical<X: Pixel>(&self, dpi_factor: f64) -> LogicalPosition<X> {
+        assert!(validate_scale_factor(dpi_factor));
+        let x = self.x.into() / dpi_factor;
+        let y = self.y.into() / dpi_factor;
+        LogicalPosition::new(x, y).cast()
+    }
+
+    #[inline]
+    pub fn cast<X: Pixel>(&self) -> PhysicalPosition<X> {
+        PhysicalPosition {
+            x: self.x.cast(),
+            y: self.y.cast(),
+        }
     }
 }
 
-impl From<(f64, f64)> for PhysicalPosition {
-    #[inline]
-    fn from((x, y): (f64, f64)) -> Self {
-        Self::new(x, y)
+impl<P: Pixel, X: Pixel> From<(X, X)> for PhysicalPosition<P> {
+    fn from((x, y): (X, X)) -> PhysicalPosition<P> {
+        PhysicalPosition::new(x.cast(), y.cast())
     }
 }
 
-impl From<(i32, i32)> for PhysicalPosition {
-    #[inline]
-    fn from((x, y): (i32, i32)) -> Self {
-        Self::new(x as f64, y as f64)
+impl<P: Pixel, X: Pixel> Into<(X, X)> for PhysicalPosition<P> {
+    fn into(self: Self) -> (X, X) {
+        (self.x.cast(), self.y.cast())
     }
 }
 
-impl Into<(f64, f64)> for PhysicalPosition {
-    #[inline]
-    fn into(self) -> (f64, f64) {
-        (self.x, self.y)
+impl<P: Pixel, X: Pixel> From<[X; 2]> for PhysicalPosition<P> {
+    fn from([x, y]: [X; 2]) -> PhysicalPosition<P> {
+        PhysicalPosition::new(x.cast(), y.cast())
     }
 }
 
-impl Into<(i32, i32)> for PhysicalPosition {
-    /// Note that this rounds instead of truncating.
-    #[inline]
-    fn into(self) -> (i32, i32) {
-        (self.x.round() as _, self.y.round() as _)
+impl<P: Pixel, X: Pixel> Into<[X; 2]> for PhysicalPosition<P> {
+    fn into(self: Self) -> [X; 2] {
+        [self.x.cast(), self.y.cast()]
     }
 }
 
 /// A size represented in logical pixels.
-///
-/// The size is stored as floats, so please be careful. Casting floats to integers truncates the fractional part,
-/// which can cause noticable issues. To help with that, an `Into<(u32, u32)>` implementation is provided which
-/// does the rounding for you.
 #[derive(Debug, Copy, Clone, PartialEq)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-pub struct LogicalSize {
-    pub width: f64,
-    pub height: f64,
+pub struct LogicalSize<P> {
+    pub width: P,
+    pub height: P,
 }
 
-impl LogicalSize {
+impl<P> LogicalSize<P> {
     #[inline]
-    pub fn new(width: f64, height: f64) -> Self {
+    pub const fn new(width: P, height: P) -> Self {
         LogicalSize { width, height }
     }
+}
 
+impl<P: Pixel> LogicalSize<P> {
     #[inline]
-    pub fn from_physical<T: Into<PhysicalSize>>(physical: T, dpi_factor: f64) -> Self {
+    pub fn from_physical<T: Into<PhysicalSize<X>>, X: Pixel>(physical: T, dpi_factor: f64) -> Self {
         physical.into().to_logical(dpi_factor)
     }
 
     #[inline]
-    pub fn to_physical(&self, dpi_factor: f64) -> PhysicalSize {
-        assert!(validate_hidpi_factor(dpi_factor));
-        let width = self.width * dpi_factor;
-        let height = self.height * dpi_factor;
-        PhysicalSize::new(width, height)
+    pub fn to_physical<X: Pixel>(&self, dpi_factor: f64) -> PhysicalSize<X> {
+        assert!(validate_scale_factor(dpi_factor));
+        let width = self.width.into() * dpi_factor;
+        let height = self.height.into() * dpi_factor;
+        PhysicalSize::new(width, height).cast()
+    }
+
+    #[inline]
+    pub fn cast<X: Pixel>(&self) -> LogicalSize<X> {
+        LogicalSize {
+            width: self.width.cast(),
+            height: self.height.cast(),
+        }
     }
 }
 
-impl From<(f64, f64)> for LogicalSize {
-    #[inline]
-    fn from((width, height): (f64, f64)) -> Self {
-        Self::new(width, height)
+impl<P: Pixel, X: Pixel> From<(X, X)> for LogicalSize<P> {
+    fn from((x, y): (X, X)) -> LogicalSize<P> {
+        LogicalSize::new(x.cast(), y.cast())
     }
 }
 
-impl From<(u32, u32)> for LogicalSize {
-    #[inline]
-    fn from((width, height): (u32, u32)) -> Self {
-        Self::new(width as f64, height as f64)
+impl<P: Pixel, X: Pixel> Into<(X, X)> for LogicalSize<P> {
+    fn into(self: LogicalSize<P>) -> (X, X) {
+        (self.width.cast(), self.height.cast())
     }
 }
 
-impl Into<(f64, f64)> for LogicalSize {
-    #[inline]
-    fn into(self) -> (f64, f64) {
-        (self.width, self.height)
+impl<P: Pixel, X: Pixel> From<[X; 2]> for LogicalSize<P> {
+    fn from([x, y]: [X; 2]) -> LogicalSize<P> {
+        LogicalSize::new(x.cast(), y.cast())
     }
 }
 
-impl Into<(u32, u32)> for LogicalSize {
-    /// Note that this rounds instead of truncating.
-    #[inline]
-    fn into(self) -> (u32, u32) {
-        (self.width.round() as _, self.height.round() as _)
+impl<P: Pixel, X: Pixel> Into<[X; 2]> for LogicalSize<P> {
+    fn into(self: Self) -> [X; 2] {
+        [self.width.cast(), self.height.cast()]
     }
 }
 
 /// A size represented in physical pixels.
-///
-/// The size is stored as floats, so please be careful. Casting floats to integers truncates the fractional part,
-/// which can cause noticable issues. To help with that, an `Into<(u32, u32)>` implementation is provided which
-/// does the rounding for you.
-#[derive(Debug, Copy, Clone, PartialEq)]
+#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-pub struct PhysicalSize {
-    pub width: f64,
-    pub height: f64,
+pub struct PhysicalSize<P> {
+    pub width: P,
+    pub height: P,
 }
 
-impl PhysicalSize {
+impl<P> PhysicalSize<P> {
     #[inline]
-    pub fn new(width: f64, height: f64) -> Self {
+    pub const fn new(width: P, height: P) -> Self {
         PhysicalSize { width, height }
     }
+}
 
+impl<P: Pixel> PhysicalSize<P> {
     #[inline]
-    pub fn from_logical<T: Into<LogicalSize>>(logical: T, dpi_factor: f64) -> Self {
+    pub fn from_logical<T: Into<LogicalSize<X>>, X: Pixel>(logical: T, dpi_factor: f64) -> Self {
         logical.into().to_physical(dpi_factor)
     }
 
     #[inline]
-    pub fn to_logical(&self, dpi_factor: f64) -> LogicalSize {
-        assert!(validate_hidpi_factor(dpi_factor));
-        let width = self.width / dpi_factor;
-        let height = self.height / dpi_factor;
-        LogicalSize::new(width, height)
+    pub fn to_logical<X: Pixel>(&self, dpi_factor: f64) -> LogicalSize<X> {
+        assert!(validate_scale_factor(dpi_factor));
+        let width = self.width.into() / dpi_factor;
+        let height = self.height.into() / dpi_factor;
+        LogicalSize::new(width, height).cast()
+    }
+
+    #[inline]
+    pub fn cast<X: Pixel>(&self) -> PhysicalSize<X> {
+        PhysicalSize {
+            width: self.width.cast(),
+            height: self.height.cast(),
+        }
     }
 }
 
-impl From<(f64, f64)> for PhysicalSize {
-    #[inline]
-    fn from((width, height): (f64, f64)) -> Self {
-        Self::new(width, height)
+impl<P: Pixel, X: Pixel> From<(X, X)> for PhysicalSize<P> {
+    fn from((x, y): (X, X)) -> PhysicalSize<P> {
+        PhysicalSize::new(x.cast(), y.cast())
     }
 }
 
-impl From<(u32, u32)> for PhysicalSize {
-    #[inline]
-    fn from((width, height): (u32, u32)) -> Self {
-        Self::new(width as f64, height as f64)
+impl<P: Pixel, X: Pixel> Into<(X, X)> for PhysicalSize<P> {
+    fn into(self: Self) -> (X, X) {
+        (self.width.cast(), self.height.cast())
     }
 }
 
-impl Into<(f64, f64)> for PhysicalSize {
-    #[inline]
-    fn into(self) -> (f64, f64) {
-        (self.width, self.height)
+impl<P: Pixel, X: Pixel> From<[X; 2]> for PhysicalSize<P> {
+    fn from([x, y]: [X; 2]) -> PhysicalSize<P> {
+        PhysicalSize::new(x.cast(), y.cast())
     }
 }
 
-impl Into<(u32, u32)> for PhysicalSize {
-    /// Note that this rounds instead of truncating.
-    #[inline]
-    fn into(self) -> (u32, u32) {
-        (self.width.round() as _, self.height.round() as _)
+impl<P: Pixel, X: Pixel> Into<[X; 2]> for PhysicalSize<P> {
+    fn into(self: Self) -> [X; 2] {
+        [self.width.cast(), self.height.cast()]
+    }
+}
+
+/// A size that's either physical or logical.
+#[derive(Debug, Copy, Clone, PartialEq)]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
+pub enum Size {
+    Physical(PhysicalSize<u32>),
+    Logical(LogicalSize<f64>),
+}
+
+impl Size {
+    pub fn new<S: Into<Size>>(size: S) -> Size {
+        size.into()
+    }
+
+    pub fn to_logical<P: Pixel>(&self, dpi_factor: f64) -> LogicalSize<P> {
+        match *self {
+            Size::Physical(size) => size.to_logical(dpi_factor),
+            Size::Logical(size) => size.cast(),
+        }
+    }
+
+    pub fn to_physical<P: Pixel>(&self, dpi_factor: f64) -> PhysicalSize<P> {
+        match *self {
+            Size::Physical(size) => size.cast(),
+            Size::Logical(size) => size.to_physical(dpi_factor),
+        }
+    }
+}
+
+impl<P: Pixel> From<PhysicalSize<P>> for Size {
+    #[inline]
+    fn from(size: PhysicalSize<P>) -> Size {
+        Size::Physical(size.cast())
+    }
+}
+
+impl<P: Pixel> From<LogicalSize<P>> for Size {
+    #[inline]
+    fn from(size: LogicalSize<P>) -> Size {
+        Size::Logical(size.cast())
+    }
+}
+
+/// A position that's either physical or logical.
+#[derive(Debug, Copy, Clone, PartialEq)]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
+pub enum Position {
+    Physical(PhysicalPosition<i32>),
+    Logical(LogicalPosition<f64>),
+}
+
+impl Position {
+    pub fn new<S: Into<Position>>(position: S) -> Position {
+        position.into()
+    }
+
+    pub fn to_logical<P: Pixel>(&self, dpi_factor: f64) -> LogicalPosition<P> {
+        match *self {
+            Position::Physical(position) => position.to_logical(dpi_factor),
+            Position::Logical(position) => position.cast(),
+        }
+    }
+
+    pub fn to_physical<P: Pixel>(&self, dpi_factor: f64) -> PhysicalPosition<P> {
+        match *self {
+            Position::Physical(position) => position.cast(),
+            Position::Logical(position) => position.to_physical(dpi_factor),
+        }
+    }
+}
+
+impl<P: Pixel> From<PhysicalPosition<P>> for Position {
+    #[inline]
+    fn from(position: PhysicalPosition<P>) -> Position {
+        Position::Physical(position.cast())
+    }
+}
+
+impl<P: Pixel> From<LogicalPosition<P>> for Position {
+    #[inline]
+    fn from(position: LogicalPosition<P>) -> Position {
+        Position::Logical(position.cast())
     }
 }

src/event.rs

@@ -3,63 +3,119 @@
 //! These are sent to the closure given to [`EventLoop::run(...)`][event_loop_run], where they get
 //! processed and used to modify the program state. For more details, see the root-level documentation.
 //!
+//! Some of these events represent different "parts" of a traditional event-handling loop. You could
+//! approximate the basic ordering loop of [`EventLoop::run(...)`][event_loop_run] like this:
+//!
+//! ```rust,ignore
+//! let mut control_flow = ControlFlow::Poll;
+//! let mut start_cause = StartCause::Init;
+//!
+//! while control_flow != ControlFlow::Exit {
+//!     event_handler(NewEvents(start_cause), ..., &mut control_flow);
+//!
+//!     for e in (window events, user events, device events) {
+//!         event_handler(e, ..., &mut control_flow);
+//!     }
+//!     event_handler(MainEventsCleared, ..., &mut control_flow);
+//!
+//!     for w in (redraw windows) {
+//!         event_handler(RedrawRequested(w), ..., &mut control_flow);
+//!     }
+//!     event_handler(RedrawEventsCleared, ..., &mut control_flow);
+//!
+//!     start_cause = wait_if_necessary(control_flow);
+//! }
+//!
+//! event_handler(LoopDestroyed, ..., &mut control_flow);
+//! ```
+//!
+//! This leaves out timing details like `ControlFlow::WaitUntil` but hopefully
+//! describes what happens in what order.
+//!
 //! [event_loop_run]: crate::event_loop::EventLoop::run
 use instant::Instant;
 use std::path::PathBuf;
 
 use crate::{
-    dpi::{LogicalPosition, LogicalSize},
+    dpi::{LogicalPosition, PhysicalPosition, PhysicalSize},
     platform_impl,
     window::{Theme, WindowId},
 };
 
 /// Describes a generic event.
-#[derive(Clone, Debug, PartialEq)]
-pub enum Event<T> {
+///
+/// See the module-level docs for more information on the event loop manages each event.
+#[derive(Debug, PartialEq)]
+pub enum Event<'a, T: 'static> {
+    /// Emitted when new events arrive from the OS to be processed.
+    ///
+    /// This event type is useful as a place to put code that should be done before you start
+    /// processing events, such as updating frame timing information for benchmarking or checking
+    /// the [`StartCause`][crate::event::StartCause] to see if a timer set by
+    /// [`ControlFlow::WaitUntil`](crate::event_loop::ControlFlow::WaitUntil) has elapsed.
+    NewEvents(StartCause),
+
     /// Emitted when the OS sends an event to a winit window.
     WindowEvent {
         window_id: WindowId,
-        event: WindowEvent,
+        event: WindowEvent<'a>,
     },
+
     /// Emitted when the OS sends an event to a device.
     DeviceEvent {
         device_id: DeviceId,
         event: DeviceEvent,
     },
+
     /// Emitted when an event is sent from [`EventLoopProxy::send_event`](crate::event_loop::EventLoopProxy::send_event)
     UserEvent(T),
-    /// Emitted when new events arrive from the OS to be processed.
-    NewEvents(StartCause),
-    /// Emitted when all events (except for `RedrawRequested`) have been reported.
-    ///
-    /// This event is followed by zero or more instances of `RedrawRequested`
-    /// and, finally, `RedrawEventsCleared`.
-    MainEventsCleared,
-
-    /// The OS or application has requested that a window be redrawn.
-    ///
-    /// Emitted only after `MainEventsCleared`.
-    RedrawRequested(WindowId),
-
-    /// Emitted after any `RedrawRequested` events.
-    ///
-    /// If there are no `RedrawRequested` events, it is reported immediately after
-    /// `MainEventsCleared`.
-    RedrawEventsCleared,
-
-    /// Emitted when the event loop is being shut down. This is irreversable - if this event is
-    /// emitted, it is guaranteed to be the last event emitted.
-    LoopDestroyed,
 
     /// Emitted when the application has been suspended.
     Suspended,
 
     /// Emitted when the application has been resumed.
     Resumed,
+
+    /// Emitted when all of the event loop's input events have been processed and redraw processing
+    /// is about to begin.
+    ///
+    /// This event is useful as a place to put your code that should be run after all
+    /// state-changing events have been handled and you want to do stuff (updating state, performing
+    /// calculations, etc) that happens as the "main body" of your event loop. If your program draws
+    /// graphics, it's usually better to do it in response to
+    /// [`Event::RedrawRequested`](crate::event::Event::RedrawRequested), which gets emitted
+    /// immediately after this event.
+    MainEventsCleared,
+
+    /// Emitted after `MainEventsCleared` when a window should be redrawn.
+    ///
+    /// This gets triggered in two scenarios:
+    /// - The OS has performed an operation that's invalidated the window's contents (such as
+    ///   resizing the window).
+    /// - The application has explicitly requested a redraw via
+    ///   [`Window::request_redraw`](crate::window::Window::request_redraw).
+    ///
+    /// During each iteration of the event loop, Winit will aggregate duplicate redraw requests
+    /// into a single event, to help avoid duplicating rendering work.
+    RedrawRequested(WindowId),
+
+    /// Emitted after all `RedrawRequested` events have been processed and control flow is about to
+    /// be taken away from the program. If there are no `RedrawRequested` events, it is emitted
+    /// immediately after `MainEventsCleared`.
+    ///
+    /// This event is useful for doing any cleanup or bookkeeping work after all the rendering
+    /// tasks have been completed.
+    RedrawEventsCleared,
+
+    /// Emitted when the event loop is being shut down.
+    ///
+    /// This is irreversable - if this event is emitted, it is guaranteed to be the last event that
+    /// gets emitted. You generally want to treat this as an "do on quit" event.
+    LoopDestroyed,
 }
 
-impl<T> Event<T> {
-    pub fn map_nonuser_event<U>(self) -> Result<Event<U>, Event<T>> {
+impl<'a, T> Event<'a, T> {
+    pub fn map_nonuser_event<U>(self) -> Result<Event<'a, U>, Event<'a, T>> {
         use self::Event::*;
         match self {
             UserEvent(_) => Err(self),
@@ -74,6 +130,26 @@ impl<T> Event<T> {
             Resumed => Ok(Resumed),
         }
     }
+
+    /// If the event doesn't contain a reference, turn it into an event with a `'static` lifetime.
+    /// Otherwise, return `None`.
+    pub fn to_static(self) -> Option<Event<'static, T>> {
+        use self::Event::*;
+        match self {
+            WindowEvent { window_id, event } => event
+                .to_static()
+                .map(|event| WindowEvent { window_id, event }),
+            UserEvent(_) => None,
+            DeviceEvent { device_id, event } => Some(DeviceEvent { device_id, event }),
+            NewEvents(cause) => Some(NewEvents(cause)),
+            MainEventsCleared => Some(MainEventsCleared),
+            RedrawRequested(wid) => Some(RedrawRequested(wid)),
+            RedrawEventsCleared => Some(RedrawEventsCleared),
+            LoopDestroyed => Some(LoopDestroyed),
+            Suspended => Some(Suspended),
+            Resumed => Some(Resumed),
+        }
+    }
 }
 
 /// Describes the reason the event loop is resuming.
@@ -103,13 +179,13 @@ pub enum StartCause {
 }
 
 /// Describes an event from a `Window`.
-#[derive(Clone, Debug, PartialEq)]
-pub enum WindowEvent {
+#[derive(Debug, PartialEq)]
+pub enum WindowEvent<'a> {
     /// The size of the window has changed. Contains the client area's new dimensions.
-    Resized(LogicalSize),
+    Resized(PhysicalSize<u32>),
 
     /// The position of the window has changed. Contains the window's new position.
-    Moved(LogicalPosition),
+    Moved(PhysicalPosition<u32>),
 
     /// The window has been requested to close.
     CloseRequested,
@@ -166,7 +242,7 @@ pub enum WindowEvent {
         /// (x,y) coords in pixels relative to the top-left corner of the window. Because the range of this data is
         /// limited by the display area and it may have been transformed by the OS to implement effects such as cursor
         /// acceleration, it should not be used to implement non-cursor-like interactions such as 3D camera control.
-        position: LogicalPosition,
+        position: PhysicalPosition<i32>,
         #[deprecated = "Deprecated in favor of DeviceEvent::ModifiersChanged"]
         modifiers: ModifiersState,
     },
@@ -216,16 +292,23 @@ pub enum WindowEvent {
     /// Touch event has been received
     Touch(Touch),
 
-    /// The DPI factor of the window has changed.
+    /// The window's scale factor has changed.
     ///
     /// The following user actions can cause DPI changes:
     ///
     /// * Changing the display's resolution.
-    /// * Changing the display's DPI factor (e.g. in Control Panel on Windows).
-    /// * Moving the window to a display with a different DPI factor.
+    /// * Changing the display's scale factor (e.g. in Control Panel on Windows).
+    /// * Moving the window to a display with a different scale factor.
+    ///
+    /// After this event callback has been processed, the window will be resized to whatever value
+    /// is pointed to by the `new_inner_size` reference. By default, this will contain the size suggested
+    /// by the OS, but it can be changed to any value.
     ///
     /// For more information about DPI in general, see the [`dpi`](crate::dpi) module.
-    HiDpiFactorChanged(f64),
+    ScaleFactorChanged {
+        scale_factor: f64,
+        new_inner_size: &'a mut PhysicalSize<u32>,
+    },
 
     /// The system window theme has changed.
     ///
@@ -236,6 +319,89 @@ pub enum WindowEvent {
     ThemeChanged(Theme),
 }
 
+impl<'a> WindowEvent<'a> {
+    pub fn to_static(self) -> Option<WindowEvent<'static>> {
+        use self::WindowEvent::*;
+        match self {
+            Resized(size) => Some(Resized(size)),
+            Moved(position) => Some(Moved(position)),
+            CloseRequested => Some(CloseRequested),
+            Destroyed => Some(Destroyed),
+            DroppedFile(file) => Some(DroppedFile(file)),
+            HoveredFile(file) => Some(HoveredFile(file)),
+            HoveredFileCancelled => Some(HoveredFileCancelled),
+            ReceivedCharacter(c) => Some(ReceivedCharacter(c)),
+            Focused(focused) => Some(Focused(focused)),
+            KeyboardInput {
+                device_id,
+                input,
+                is_synthetic,
+            } => Some(KeyboardInput {
+                device_id,
+                input,
+                is_synthetic,
+            }),
+            #[allow(deprecated)]
+            CursorMoved {
+                device_id,
+                position,
+                modifiers,
+            } => Some(CursorMoved {
+                device_id,
+                position,
+                modifiers,
+            }),
+            CursorEntered { device_id } => Some(CursorEntered { device_id }),
+            CursorLeft { device_id } => Some(CursorLeft { device_id }),
+            #[allow(deprecated)]
+            MouseWheel {
+                device_id,
+                delta,
+                phase,
+                modifiers,
+            } => Some(MouseWheel {
+                device_id,
+                delta,
+                phase,
+                modifiers,
+            }),
+            #[allow(deprecated)]
+            MouseInput {
+                device_id,
+                state,
+                button,
+                modifiers,
+            } => Some(MouseInput {
+                device_id,
+                state,
+                button,
+                modifiers,
+            }),
+            TouchpadPressure {
+                device_id,
+                pressure,
+                stage,
+            } => Some(TouchpadPressure {
+                device_id,
+                pressure,
+                stage,
+            }),
+            AxisMotion {
+                device_id,
+                axis,
+                value,
+            } => Some(AxisMotion {
+                device_id,
+                axis,
+                value,
+            }),
+            Touch(touch) => Some(Touch(touch)),
+            ThemeChanged(theme) => Some(ThemeChanged(theme)),
+            ScaleFactorChanged { .. } => None,
+        }
+    }
+}
+
 /// Identifier of an input device.
 ///
 /// Whenever you receive an event arising from a particular input device, this event contains a `DeviceId` which
@@ -370,7 +536,7 @@ pub enum TouchPhase {
 pub struct Touch {
     pub device_id: DeviceId,
     pub phase: TouchPhase,
-    pub location: LogicalPosition,
+    pub location: PhysicalPosition<f64>,
     /// Describes how hard the screen was pressed. May be `None` if the platform
     /// does not support pressure sensitivity.
     ///
@@ -481,7 +647,7 @@ pub enum MouseScrollDelta {
     /// Scroll events are expressed as a PixelDelta if
     /// supported by the device (eg. a touchpad) and
     /// platform.
-    PixelDelta(LogicalPosition),
+    PixelDelta(LogicalPosition<f64>),
 }
 
 /// Symbolic name for a keyboard key.

src/event_loop.rs

@@ -143,7 +143,7 @@ impl<T> EventLoop<T> {
     #[inline]
     pub fn run<F>(self, event_handler: F) -> !
     where
-        F: 'static + FnMut(Event<T>, &EventLoopWindowTarget<T>, &mut ControlFlow),
+        F: 'static + FnMut(Event<'_, T>, &EventLoopWindowTarget<T>, &mut ControlFlow),
     {
         self.event_loop.run(event_handler)
     }

src/lib.rs

@@ -1,6 +1,6 @@
-//! Winit allows you to build a window on as many platforms as possible.
+//! Winit is a cross-platform window creation and event loop management library.
 //!
-//! # Building a window
+//! # Building windows
 //!
 //! Before you can build a [`Window`], you first need to build an [`EventLoop`]. This is done with the
 //! [`EventLoop::new()`] function.
@@ -15,26 +15,31 @@
 //!  - Calling [`Window::new(&event_loop)`][window_new].
 //!  - Calling [`let builder = WindowBuilder::new()`][window_builder_new] then [`builder.build(&event_loop)`][window_builder_build].
 //!
-//! The first way is the simplest way and will give you default values for everything.
-//!
-//! The second way allows you to customize the way your [`Window`] will look and behave by modifying
-//! the fields of the [`WindowBuilder`] object before you create the [`Window`].
+//! The first method is the simplest, and will give you default values for everything. The second
+//! method allows you to customize the way your [`Window`] will look and behave by modifying the
+//! fields of the [`WindowBuilder`] object before you create the [`Window`].
 //!
 //! # Event handling
 //!
 //! Once a [`Window`] has been created, it will generate different *events*. A [`Window`] object can
-//! generate a [`WindowEvent`] when certain things happen, like whenever the user moves their mouse
-//! or presses a key inside the [`Window`]. Devices can generate a [`DeviceEvent`] directly as well,
-//! which contains unfiltered event data that isn't specific to a certain window. Some user
-//! activity, like mouse movement, can generate both a [`WindowEvent`] *and* a [`DeviceEvent`]. You
-//! can also create and handle your own custom [`UserEvent`]s, if desired.
+//! generate [`WindowEvent`]s when certain input events occur, such as a cursor moving over the
+//! window or a key getting pressed while the window is focused. Devices can generate
+//! [`DeviceEvent`]s, which contain unfiltered event data that isn't specific to a certain window.
+//! Some user activity, like mouse movement, can generate both a [`WindowEvent`] *and* a
+//! [`DeviceEvent`]. You can also create and handle your own custom [`UserEvent`]s, if desired.
 //!
-//! Events can be retreived by using an [`EventLoop`]. A [`Window`] will send its events to the
-//! [`EventLoop`] object it was created with.
+//! You can retreive events by calling [`EventLoop::run`][event_loop_run]. This function will
+//! dispatch events for every [`Window`] that was created with that particular [`EventLoop`], and
+//! will run until the `control_flow` argument given to the closure is set to
+//! [`ControlFlow`]`::`[`Exit`], at which point [`Event`]`::`[`LoopDestroyed`] is emitted and the
+//! entire program terminates.
+//!
+//! Winit no longer uses a `EventLoop::poll_events() -> impl Iterator<Event>`-based event loop
+//! model, since that can't be implemented properly on web and mobile platforms and works poorly on
+//! most desktop platforms. However, this model can be re-implemented to an extent on desktops with
+//! [`EventLoopExtDesktop::run_return`]. See that method's documentation for more reasons about why
+//! it's discouraged, beyond mobile/web compatibility reasons.
 //!
-//! You do this by calling [`event_loop.run(...)`][event_loop_run]. This function will run forever
-//! unless `control_flow` is set to [`ControlFlow`]`::`[`Exit`], at which point [`Event`]`::`[`LoopDestroyed`]
-//! is emitted and the entire program terminates.
 //!
 //! ```no_run
 //! use winit::{
@@ -47,7 +52,23 @@
 //! let window = WindowBuilder::new().build(&event_loop).unwrap();
 //!
 //! event_loop.run(move |event, _, control_flow| {
+//!     // ControlFlow::Poll continuously runs the event loop, even if the OS hasn't
+//!     // dispatched any events. This is ideal for games and similar applications.
+//!     *control_flow = ControlFlow::Poll;
+//!
+//!     // ControlFlow::Wait pauses the event loop if no events are available to process.
+//!     // This is ideal for non-game applications that only update in response to user
+//!     // input, and uses significantly less power/CPU time than ControlFlow::Poll.
+//!     *control_flow = ControlFlow::Wait;
+//!
 //!     match event {
+//!         Event::WindowEvent {
+//!             event: WindowEvent::CloseRequested,
+//!             ..
+//!         } => {
+//!             println!("The close button was pressed; stopping");
+//!             *control_flow = ControlFlow::Exit
+//!         },
 //!         Event::MainEventsCleared => {
 //!             // Application update code.
 //!
@@ -61,40 +82,29 @@
 //!             // rendering in here allows the program to gracefully handle redraws requested
 //!             // by the OS.
 //!         },
-//!         Event::WindowEvent {
-//!             event: WindowEvent::CloseRequested,
-//!             ..
-//!         } => {
-//!             println!("The close button was pressed; stopping");
-//!             *control_flow = ControlFlow::Exit
-//!         },
-//!         // ControlFlow::Poll continuously runs the event loop, even if the OS hasn't
-//!         // dispatched any events. This is ideal for games and similar applications.
-//!         _ => *control_flow = ControlFlow::Poll,
-//!         // ControlFlow::Wait pauses the event loop if no events are available to process.
-//!         // This is ideal for non-game applications that only update in response to user
-//!         // input, and uses significantly less power/CPU time than ControlFlow::Poll.
-//!         // _ => *control_flow = ControlFlow::Wait,
+//!         _ => ()
 //!     }
 //! });
 //! ```
 //!
-//! If you use multiple [`Window`]s, [`Event`]`::`[`WindowEvent`] has a member named `window_id`. You can
-//! compare it with the value returned by the [`id()`][window_id_fn] method of [`Window`] in order to know which
-//! [`Window`] has received the event.
+//! [`Event`]`::`[`WindowEvent`] has a [`WindowId`] member. In multi-window environments, it should be
+//! compared to the value returned by [`Window::id()`][window_id_fn] to determine which [`Window`]
+//! dispatched the event.
 //!
 //! # Drawing on the window
 //!
-//! Winit doesn't provide any function that allows drawing on a [`Window`]. However it allows you to
+//! Winit doesn't directly provide any methods for drawing on a [`Window`]. However it allows you to
 //! retrieve the raw handle of the window (see the [`platform`] module), which in turn allows you
-//! to create an OpenGL/Vulkan/DirectX/Metal/etc. context that will draw on the [`Window`].
+//! to create an OpenGL/Vulkan/DirectX/Metal/etc. context that can be used to render graphics.
 //!
 //! [`EventLoop`]: event_loop::EventLoop
+//! [`EventLoopExtDesktop::run_return`]: ./platform/desktop/trait.EventLoopExtDesktop.html#tymethod.run_return
 //! [`EventLoop::new()`]: event_loop::EventLoop::new
 //! [event_loop_run]: event_loop::EventLoop::run
 //! [`ControlFlow`]: event_loop::ControlFlow
 //! [`Exit`]: event_loop::ControlFlow::Exit
 //! [`Window`]: window::Window
+//! [`WindowId`]: window::WindowId
 //! [`WindowBuilder`]: window::WindowBuilder
 //! [window_new]: window::Window::new
 //! [window_builder_new]: window::WindowBuilder::new

src/monitor.rs

@@ -58,7 +58,7 @@ impl Ord for VideoMode {
 impl VideoMode {
     /// Returns the resolution of this video mode.
     #[inline]
-    pub fn size(&self) -> PhysicalSize {
+    pub fn size(&self) -> PhysicalSize<u32> {
         self.video_mode.size()
     }
 
@@ -133,7 +133,7 @@ impl MonitorHandle {
     ///
     /// - **Web:** Always returns (0,0)
     #[inline]
-    pub fn size(&self) -> PhysicalSize {
+    pub fn size(&self) -> PhysicalSize<u32> {
         self.inner.size()
     }
 
@@ -144,22 +144,22 @@ impl MonitorHandle {
     ///
     /// - **Web:** Always returns (0,0)
     #[inline]
-    pub fn position(&self) -> PhysicalPosition {
+    pub fn position(&self) -> PhysicalPosition<i32> {
         self.inner.position()
     }
 
-    /// Returns the DPI factor that can be used to map logical pixels to physical pixels, and vice versa.
+    /// Returns the scale factor that can be used to map logical pixels to physical pixels, and vice versa.
     ///
     /// See the [`dpi`](crate::dpi) module for more information.
     ///
     /// ## Platform-specific
     ///
-    /// - **X11:** Can be overridden using the `WINIT_HIDPI_FACTOR` environment variable.
+    /// - **X11:** Can be overridden using the `WINIT_X11_SCALE_FACTOR` environment variable.
     /// - **Android:** Always returns 1.0.
     /// - **Web:** Always returns 1.0
     #[inline]
-    pub fn hidpi_factor(&self) -> f64 {
-        self.inner.hidpi_factor()
+    pub fn scale_factor(&self) -> f64 {
+        self.inner.scale_factor()
     }
 
     /// Returns all fullscreen video modes supported by this monitor.

src/platform/desktop.rs

@@ -30,7 +30,11 @@ pub trait EventLoopExtDesktop {
     /// You are strongly encouraged to use `run`, unless the use of this is absolutely necessary.
     fn run_return<F>(&mut self, event_handler: F)
     where
-        F: FnMut(Event<Self::UserEvent>, &EventLoopWindowTarget<Self::UserEvent>, &mut ControlFlow);
+        F: FnMut(
+            Event<'_, Self::UserEvent>,
+            &EventLoopWindowTarget<Self::UserEvent>,
+            &mut ControlFlow,
+        );
 }
 
 impl<T> EventLoopExtDesktop for EventLoop<T> {
@@ -38,7 +42,11 @@ impl<T> EventLoopExtDesktop for EventLoop<T> {
 
     fn run_return<F>(&mut self, event_handler: F)
     where
-        F: FnMut(Event<T>, &EventLoopWindowTarget<T>, &mut ControlFlow),
+        F: FnMut(
+            Event<'_, Self::UserEvent>,
+            &EventLoopWindowTarget<Self::UserEvent>,
+            &mut ControlFlow,
+        ),
     {
         self.event_loop.run_return(event_handler)
     }

src/platform/ios.rs

@@ -43,14 +43,14 @@ pub trait WindowExtIOS {
     /// [`UIView`]: https://developer.apple.com/documentation/uikit/uiview?language=objc
     fn ui_view(&self) -> *mut c_void;
 
-    /// Sets the [`contentScaleFactor`] of the underlying [`UIWindow`] to `hidpi_factor`.
+    /// Sets the [`contentScaleFactor`] of the underlying [`UIWindow`] to `scale_factor`.
     ///
     /// The default value is device dependent, and it's recommended GLES or Metal applications set
-    /// this to [`MonitorHandle::hidpi_factor()`].
+    /// this to [`MonitorHandle::scale_factor()`].
     ///
     /// [`UIWindow`]: https://developer.apple.com/documentation/uikit/uiwindow?language=objc
     /// [`contentScaleFactor`]: https://developer.apple.com/documentation/uikit/uiview/1622657-contentscalefactor?language=objc
-    fn set_hidpi_factor(&self, hidpi_factor: f64);
+    fn set_scale_factor(&self, scale_factor: f64);
 
     /// Sets the valid orientations for the [`Window`].
     ///
@@ -113,8 +113,8 @@ impl WindowExtIOS for Window {
     }
 
     #[inline]
-    fn set_hidpi_factor(&self, hidpi_factor: f64) {
-        self.window.set_hidpi_factor(hidpi_factor)
+    fn set_scale_factor(&self, scale_factor: f64) {
+        self.window.set_scale_factor(scale_factor)
     }
 
     #[inline]
@@ -148,14 +148,14 @@ pub trait WindowBuilderExtIOS {
     /// [`UIView`]: https://developer.apple.com/documentation/uikit/uiview?language=objc
     fn with_root_view_class(self, root_view_class: *const c_void) -> WindowBuilder;
 
-    /// Sets the [`contentScaleFactor`] of the underlying [`UIWindow`] to `hidpi_factor`.
+    /// Sets the [`contentScaleFactor`] of the underlying [`UIWindow`] to `scale_factor`.
     ///
     /// The default value is device dependent, and it's recommended GLES or Metal applications set
-    /// this to [`MonitorHandle::hidpi_factor()`].
+    /// this to [`MonitorHandle::scale_factor()`].
     ///
     /// [`UIWindow`]: https://developer.apple.com/documentation/uikit/uiwindow?language=objc
     /// [`contentScaleFactor`]: https://developer.apple.com/documentation/uikit/uiview/1622657-contentscalefactor?language=objc
-    fn with_hidpi_factor(self, hidpi_factor: f64) -> WindowBuilder;
+    fn with_scale_factor(self, scale_factor: f64) -> WindowBuilder;
 
     /// Sets the valid orientations for the [`Window`].
     ///
@@ -204,8 +204,8 @@ impl WindowBuilderExtIOS for WindowBuilder {
     }
 
     #[inline]
-    fn with_hidpi_factor(mut self, hidpi_factor: f64) -> WindowBuilder {
-        self.platform_specific.hidpi_factor = Some(hidpi_factor);
+    fn with_scale_factor(mut self, scale_factor: f64) -> WindowBuilder {
+        self.platform_specific.scale_factor = Some(scale_factor);
         self
     }
 

src/platform/macos.rs

@@ -128,7 +128,7 @@ pub trait WindowBuilderExtMacOS {
     /// Makes the window content appear behind the titlebar.
     fn with_fullsize_content_view(self, fullsize_content_view: bool) -> WindowBuilder;
     /// Build window with `resizeIncrements` property. Values must not be 0.
-    fn with_resize_increments(self, increments: LogicalSize) -> WindowBuilder;
+    fn with_resize_increments(self, increments: LogicalSize<f64>) -> WindowBuilder;
     fn with_disallow_hidpi(self, disallow_hidpi: bool) -> WindowBuilder;
 }
 
@@ -179,7 +179,7 @@ impl WindowBuilderExtMacOS for WindowBuilder {
     }
 
     #[inline]
-    fn with_resize_increments(mut self, increments: LogicalSize) -> WindowBuilder {
+    fn with_resize_increments(mut self, increments: LogicalSize<f64>) -> WindowBuilder {
         self.platform_specific.resize_increments = Some(increments.into());
         self
     }

src/platform/unix.rs

@@ -5,7 +5,7 @@ use std::{os::raw, ptr, sync::Arc};
 use smithay_client_toolkit::window::{ButtonState, Theme};
 
 use crate::{
-    dpi::LogicalSize,
+    dpi::Size,
     event_loop::{EventLoop, EventLoopWindowTarget},
     monitor::MonitorHandle,
     window::{Window, WindowBuilder},
@@ -380,9 +380,9 @@ pub trait WindowBuilderExtUnix {
     /// Build window with `_GTK_THEME_VARIANT` hint set to the specified value. Currently only relevant on X11.
     fn with_gtk_theme_variant(self, variant: String) -> Self;
     /// Build window with resize increment hint. Only implemented on X11.
-    fn with_resize_increments(self, increments: LogicalSize) -> Self;
+    fn with_resize_increments<S: Into<Size>>(self, increments: S) -> Self;
     /// Build window with base size hint. Only implemented on X11.
-    fn with_base_size(self, base_size: LogicalSize) -> Self;
+    fn with_base_size<S: Into<Size>>(self, base_size: S) -> Self;
 
     /// Build window with a given application ID. It should match the `.desktop` file distributed with
     /// your program. Only relevant on Wayland.
@@ -431,13 +431,13 @@ impl WindowBuilderExtUnix for WindowBuilder {
     }
 
     #[inline]
-    fn with_resize_increments(mut self, increments: LogicalSize) -> Self {
+    fn with_resize_increments<S: Into<Size>>(mut self, increments: S) -> Self {
         self.platform_specific.resize_increments = Some(increments.into());
         self
     }
 
     #[inline]
-    fn with_base_size(mut self, base_size: LogicalSize) -> Self {
+    fn with_base_size<S: Into<Size>>(mut self, base_size: S) -> Self {
         self.platform_specific.base_size = Some(base_size.into());
         self
     }

src/platform_impl/android/mod.rs

@@ -61,7 +61,7 @@ impl EventLoop {
         while let Ok(event) = self.event_rx.try_recv() {
             let e = match event {
                 android_glue::Event::EventMotion(motion) => {
-                    let dpi_factor = MonitorHandle.hidpi_factor();
+                    let dpi_factor = MonitorHandle.scale_factor();
                     let location = LogicalPosition::from_physical(
                         (motion.x as f64, motion.y as f64),
                         dpi_factor,
@@ -102,7 +102,7 @@ impl EventLoop {
                     if native_window.is_null() {
                         None
                     } else {
-                        let dpi_factor = MonitorHandle.hidpi_factor();
+                        let dpi_factor = MonitorHandle.scale_factor();
                         let physical_size = MonitorHandle.size();
                         let size = LogicalSize::from_physical(physical_size, dpi_factor);
                         Some(Event::WindowEvent {
@@ -193,16 +193,16 @@ impl fmt::Debug for MonitorHandle {
         #[derive(Debug)]
         struct MonitorHandle {
             name: Option<String>,
-            dimensions: PhysicalSize,
-            position: PhysicalPosition,
-            hidpi_factor: f64,
+            dimensions: PhysicalSize<u32>,
+            position: PhysicalPosition<i32>,
+            scale_factor: f64,
         }
 
         let monitor_id_proxy = MonitorHandle {
             name: self.name(),
             dimensions: self.size(),
             position: self.outer_position(),
-            hidpi_factor: self.hidpi_factor(),
+            scale_factor: self.scale_factor(),
         };
 
         monitor_id_proxy.fmt(f)
@@ -216,7 +216,7 @@ impl MonitorHandle {
     }
 
     #[inline]
-    pub fn size(&self) -> PhysicalSize {
+    pub fn size(&self) -> PhysicalSize<u32> {
         unsafe {
             let window = android_glue::native_window();
             (
@@ -228,13 +228,13 @@ impl MonitorHandle {
     }
 
     #[inline]
-    pub fn outer_position(&self) -> PhysicalPosition {
+    pub fn outer_position(&self) -> PhysicalPosition<i32> {
         // Android assumes single screen
         (0, 0).into()
     }
 
     #[inline]
-    pub fn hidpi_factor(&self) -> f64 {
+    pub fn scale_factor(&self) -> f64 {
         1.0
     }
 }
@@ -283,29 +283,29 @@ impl Window {
     }
 
     #[inline]
-    pub fn outer_position(&self) -> Option<LogicalPosition> {
+    pub fn outer_position(&self) -> Option<LogicalPosition<f64>> {
         // N/A
         None
     }
 
     #[inline]
-    pub fn inner_position(&self) -> Option<LogicalPosition> {
+    pub fn inner_position(&self) -> Option<LogicalPosition<f64>> {
         // N/A
         None
     }
 
     #[inline]
-    pub fn set_outer_position(&self, _position: LogicalPosition) {
+    pub fn set_outer_position(&self, _position: LogicalPosition<f64>) {
         // N/A
     }
 
     #[inline]
-    pub fn set_min_inner_size(&self, _dimensions: Option<LogicalSize>) {
+    pub fn set_min_inner_size(&self, _dimensions: Option<LogicalSize<f64>>) {
         // N/A
     }
 
     #[inline]
-    pub fn set_max_inner_size(&self, _dimensions: Option<LogicalSize>) {
+    pub fn set_max_inner_size(&self, _dimensions: Option<LogicalSize<f64>>) {
         // N/A
     }
 
@@ -315,29 +315,29 @@ impl Window {
     }
 
     #[inline]
-    pub fn inner_size(&self) -> Option<LogicalSize> {
+    pub fn inner_size(&self) -> Option<LogicalSize<f64>> {
         if self.native_window.is_null() {
             None
         } else {
-            let dpi_factor = self.hidpi_factor();
+            let dpi_factor = self.scale_factor();
             let physical_size = self.current_monitor().size();
             Some(LogicalSize::from_physical(physical_size, dpi_factor))
         }
     }
 
     #[inline]
-    pub fn outer_size(&self) -> Option<LogicalSize> {
+    pub fn outer_size(&self) -> Option<LogicalSize<f64>> {
         self.inner_size()
     }
 
     #[inline]
-    pub fn set_inner_size(&self, _size: LogicalSize) {
+    pub fn set_inner_size(&self, _size: LogicalSize<f64>) {
         // N/A
     }
 
     #[inline]
-    pub fn hidpi_factor(&self) -> f64 {
-        self.current_monitor().hidpi_factor()
+    pub fn scale_factor(&self) -> f64 {
+        self.current_monitor().scale_factor()
     }
 
     #[inline]
@@ -356,7 +356,10 @@ impl Window {
     }
 
     #[inline]
-    pub fn set_cursor_position(&self, _position: LogicalPosition) -> Result<(), ExternalError> {
+    pub fn set_cursor_position(
+        &self,
+        _position: LogicalPosition<f64>,
+    ) -> Result<(), ExternalError> {
         Err(ExternalError::NotSupported(NotSupportedError::new()))
     }
 
@@ -400,7 +403,7 @@ impl Window {
     }
 
     #[inline]
-    pub fn set_ime_position(&self, _spot: LogicalPosition) {
+    pub fn set_ime_position(&self, _spot: LogicalPosition<f64>) {
         // N/A
     }
 

src/platform_impl/ios/app_state.rs

@@ -12,15 +12,16 @@ use std::{
 use objc::runtime::{BOOL, YES};
 
 use crate::{
-    event::{Event, StartCause},
+    dpi::LogicalSize,
+    event::{Event, StartCause, WindowEvent},
     event_loop::ControlFlow,
     platform_impl::platform::{
-        event_loop::{EventHandler, Never},
+        event_loop::{EventHandler, EventProxy, EventWrapper, Never},
         ffi::{
             id, kCFRunLoopCommonModes, CFAbsoluteTimeGetCurrent, CFRelease, CFRunLoopAddTimer,
             CFRunLoopGetMain, CFRunLoopRef, CFRunLoopTimerCreate, CFRunLoopTimerInvalidate,
-            CFRunLoopTimerRef, CFRunLoopTimerSetNextFireDate, NSInteger, NSOperatingSystemVersion,
-            NSUInteger,
+            CFRunLoopTimerRef, CFRunLoopTimerSetNextFireDate, CGRect, CGSize, NSInteger,
+            NSOperatingSystemVersion, NSUInteger,
         },
     },
     window::WindowId as RootWindowId,
@@ -45,11 +46,11 @@ enum UserCallbackTransitionResult<'a> {
         processing_redraws: bool,
     },
     ReentrancyPrevented {
-        queued_events: &'a mut Vec<Event<Never>>,
+        queued_events: &'a mut Vec<EventWrapper>,
     },
 }
 
-impl Event<Never> {
+impl Event<'static, Never> {
     fn is_redraw(&self) -> bool {
         if let Event::RedrawRequested(_) = self {
             true
@@ -65,12 +66,12 @@ impl Event<Never> {
 enum AppStateImpl {
     NotLaunched {
         queued_windows: Vec<id>,
-        queued_events: Vec<Event<Never>>,
+        queued_events: Vec<EventWrapper>,
         queued_gpu_redraws: HashSet<id>,
     },
     Launching {
         queued_windows: Vec<id>,
-        queued_events: Vec<Event<Never>>,
+        queued_events: Vec<EventWrapper>,
         queued_event_handler: Box<dyn EventHandler>,
         queued_gpu_redraws: HashSet<id>,
     },
@@ -81,7 +82,7 @@ enum AppStateImpl {
     },
     // special state to deal with reentrancy and prevent mutable aliasing.
     InUserCallback {
-        queued_events: Vec<Event<Never>>,
+        queued_events: Vec<EventWrapper>,
         queued_gpu_redraws: HashSet<id>,
     },
     ProcessingRedraws {
@@ -222,7 +223,7 @@ impl AppState {
         });
     }
 
-    fn did_finish_launching_transition(&mut self) -> (Vec<id>, Vec<Event<Never>>) {
+    fn did_finish_launching_transition(&mut self) -> (Vec<id>, Vec<EventWrapper>) {
         let (windows, events, event_handler, queued_gpu_redraws) = match self.take_state() {
             AppStateImpl::Launching {
                 queued_windows,
@@ -245,7 +246,7 @@ impl AppState {
         (windows, events)
     }
 
-    fn wakeup_transition(&mut self) -> Option<Event<Never>> {
+    fn wakeup_transition(&mut self) -> Option<EventWrapper> {
         // before `AppState::did_finish_launching` is called, pretend there is no running
         // event loop.
         if !self.has_launched() {
@@ -258,7 +259,10 @@ impl AppState {
                 AppStateImpl::PollFinished {
                     waiting_event_handler,
                 },
-            ) => (waiting_event_handler, Event::NewEvents(StartCause::Poll)),
+            ) => (
+                waiting_event_handler,
+                EventWrapper::StaticEvent(Event::NewEvents(StartCause::Poll)),
+            ),
             (
                 ControlFlow::Wait,
                 AppStateImpl::Waiting {
@@ -267,10 +271,10 @@ impl AppState {
                 },
             ) => (
                 waiting_event_handler,
-                Event::NewEvents(StartCause::WaitCancelled {
+                EventWrapper::StaticEvent(Event::NewEvents(StartCause::WaitCancelled {
                     start,
                     requested_resume: None,
-                }),
+                })),
             ),
             (
                 ControlFlow::WaitUntil(requested_resume),
@@ -280,15 +284,15 @@ impl AppState {
                 },
             ) => {
                 let event = if Instant::now() >= requested_resume {
-                    Event::NewEvents(StartCause::ResumeTimeReached {
+                    EventWrapper::StaticEvent(Event::NewEvents(StartCause::ResumeTimeReached {
                         start,
                         requested_resume,
-                    })
+                    }))
                 } else {
-                    Event::NewEvents(StartCause::WaitCancelled {
+                    EventWrapper::StaticEvent(Event::NewEvents(StartCause::WaitCancelled {
                         start,
                         requested_resume: Some(requested_resume),
-                    })
+                    }))
                 };
                 (waiting_event_handler, event)
             }
@@ -587,7 +591,10 @@ pub unsafe fn did_finish_launching() {
 
     let (windows, events) = AppState::get_mut().did_finish_launching_transition();
 
-    let events = std::iter::once(Event::NewEvents(StartCause::Init)).chain(events);
+    let events = std::iter::once(EventWrapper::StaticEvent(Event::NewEvents(
+        StartCause::Init,
+    )))
+    .chain(events);
     handle_nonuser_events(events);
 
     // the above window dance hack, could possibly trigger new windows to be created.
@@ -616,12 +623,12 @@ pub unsafe fn handle_wakeup_transition() {
 }
 
 // requires main thread
-pub unsafe fn handle_nonuser_event(event: Event<Never>) {
+pub unsafe fn handle_nonuser_event(event: EventWrapper) {
     handle_nonuser_events(std::iter::once(event))
 }
 
 // requires main thread
-pub unsafe fn handle_nonuser_events<I: IntoIterator<Item = Event<Never>>>(events: I) {
+pub unsafe fn handle_nonuser_events<I: IntoIterator<Item = EventWrapper>>(events: I) {
     let mut this = AppState::get_mut();
     let (mut event_handler, active_control_flow, processing_redraws) =
         match this.try_user_callback_transition() {
@@ -638,16 +645,23 @@ pub unsafe fn handle_nonuser_events<I: IntoIterator<Item = Event<Never>>>(events
     let mut control_flow = this.control_flow;
     drop(this);
 
-    for event in events {
-        if !processing_redraws && event.is_redraw() {
-            log::info!("processing `RedrawRequested` during the main event loop");
-        } else if processing_redraws && !event.is_redraw() {
-            log::warn!(
-                "processing non `RedrawRequested` event after the main event loop: {:#?}",
-                event
-            );
+    for wrapper in events {
+        match wrapper {
+            EventWrapper::StaticEvent(event) => {
+                if !processing_redraws && event.is_redraw() {
+                    log::info!("processing `RedrawRequested` during the main event loop");
+                } else if processing_redraws && !event.is_redraw() {
+                    log::warn!(
+                        "processing non `RedrawRequested` event after the main event loop: {:#?}",
+                        event
+                    );
+                }
+                event_handler.handle_nonuser_event(event, &mut control_flow)
+            }
+            EventWrapper::EventProxy(proxy) => {
+                handle_event_proxy(&mut event_handler, control_flow, proxy)
+            }
         }
-        event_handler.handle_nonuser_event(event, &mut control_flow)
     }
 
     loop {
@@ -688,16 +702,23 @@ pub unsafe fn handle_nonuser_events<I: IntoIterator<Item = Event<Never>>>(events
         }
         drop(this);
 
-        for event in queued_events {
-            if !processing_redraws && event.is_redraw() {
-                log::info!("processing `RedrawRequested` during the main event loop");
-            } else if processing_redraws && !event.is_redraw() {
-                log::warn!(
-                    "processing non-`RedrawRequested` event after the main event loop: {:#?}",
-                    event
-                );
+        for wrapper in queued_events {
+            match wrapper {
+                EventWrapper::StaticEvent(event) => {
+                    if !processing_redraws && event.is_redraw() {
+                        log::info!("processing `RedrawRequested` during the main event loop");
+                    } else if processing_redraws && !event.is_redraw() {
+                        log::warn!(
+                            "processing non-`RedrawRequested` event after the main event loop: {:#?}",
+                            event
+                        );
+                    }
+                    event_handler.handle_nonuser_event(event, &mut control_flow)
+                }
+                EventWrapper::EventProxy(proxy) => {
+                    handle_event_proxy(&mut event_handler, control_flow, proxy)
+                }
             }
-            event_handler.handle_nonuser_event(event, &mut control_flow)
         }
     }
 }
@@ -751,8 +772,15 @@ unsafe fn handle_user_events() {
         }
         drop(this);
 
-        for event in queued_events {
-            event_handler.handle_nonuser_event(event, &mut control_flow)
+        for wrapper in queued_events {
+            match wrapper {
+                EventWrapper::StaticEvent(event) => {
+                    event_handler.handle_nonuser_event(event, &mut control_flow)
+                }
+                EventWrapper::EventProxy(proxy) => {
+                    handle_event_proxy(&mut event_handler, control_flow, proxy)
+                }
+            }
         }
         event_handler.handle_user_events(&mut control_flow);
     }
@@ -772,17 +800,19 @@ pub unsafe fn handle_main_events_cleared() {
 
     // User events are always sent out at the end of the "MainEventLoop"
     handle_user_events();
-    handle_nonuser_event(Event::MainEventsCleared);
+    handle_nonuser_event(EventWrapper::StaticEvent(Event::MainEventsCleared));
 
     let mut this = AppState::get_mut();
-    let mut redraw_events: Vec<Event<Never>> = this
+    let mut redraw_events: Vec<EventWrapper> = this
         .main_events_cleared_transition()
         .into_iter()
-        .map(|window| Event::RedrawRequested(RootWindowId(window.into())))
+        .map(|window| {
+            EventWrapper::StaticEvent(Event::RedrawRequested(RootWindowId(window.into())))
+        })
         .collect();
 
     if !redraw_events.is_empty() {
-        redraw_events.push(Event::RedrawEventsCleared);
+        redraw_events.push(EventWrapper::StaticEvent(Event::RedrawEventsCleared));
     }
     drop(this);
 
@@ -804,6 +834,66 @@ pub unsafe fn terminated() {
     event_handler.handle_nonuser_event(Event::LoopDestroyed, &mut control_flow)
 }
 
+fn handle_event_proxy(
+    event_handler: &mut Box<dyn EventHandler>,
+    control_flow: ControlFlow,
+    proxy: EventProxy,
+) {
+    match proxy {
+        EventProxy::DpiChangedProxy {
+            suggested_size,
+            scale_factor,
+            window_id,
+        } => handle_hidpi_proxy(
+            event_handler,
+            control_flow,
+            suggested_size,
+            scale_factor,
+            window_id,
+        ),
+    }
+}
+
+fn handle_hidpi_proxy(
+    event_handler: &mut Box<dyn EventHandler>,
+    mut control_flow: ControlFlow,
+    suggested_size: LogicalSize<f64>,
+    scale_factor: f64,
+    window_id: id,
+) {
+    let mut size = suggested_size.to_physical(scale_factor);
+    let new_inner_size = &mut size;
+    let event = Event::WindowEvent {
+        window_id: RootWindowId(window_id.into()),
+        event: WindowEvent::ScaleFactorChanged {
+            scale_factor,
+            new_inner_size,
+        },
+    };
+    event_handler.handle_nonuser_event(event, &mut control_flow);
+    let (view, screen_frame) = get_view_and_screen_frame(window_id);
+    let physical_size = *new_inner_size;
+    let logical_size = physical_size.to_logical(scale_factor);
+    let size = CGSize::new(logical_size);
+    let new_frame: CGRect = CGRect::new(screen_frame.origin, size);
+    unsafe {
+        let () = msg_send![view, setFrame: new_frame];
+    }
+}
+
+fn get_view_and_screen_frame(window_id: id) -> (id, CGRect) {
+    unsafe {
+        let view_controller: id = msg_send![window_id, rootViewController];
+        let view: id = msg_send![view_controller, view];
+        let bounds: CGRect = msg_send![window_id, bounds];
+        let screen: id = msg_send![window_id, screen];
+        let screen_space: id = msg_send![screen, coordinateSpace];
+        let screen_frame: CGRect =
+            msg_send![window_id, convertRect:bounds toCoordinateSpace:screen_space];
+        (view, screen_frame)
+    }
+}
+
 struct EventLoopWaker {
     timer: CFRunLoopTimerRef,
 }

src/platform_impl/ios/event_loop.rs

@@ -8,6 +8,7 @@ use std::{
 };
 
 use crate::{
+    dpi::LogicalSize,
     event::Event,
     event_loop::{
         ControlFlow, EventLoopClosed, EventLoopWindowTarget as RootEventLoopWindowTarget,
@@ -28,6 +29,21 @@ use crate::platform_impl::platform::{
     monitor, view, MonitorHandle,
 };
 
+#[derive(Debug)]
+pub enum EventWrapper {
+    StaticEvent(Event<'static, Never>),
+    EventProxy(EventProxy),
+}
+
+#[derive(Debug, PartialEq)]
+pub enum EventProxy {
+    DpiChangedProxy {
+        window_id: id,
+        suggested_size: LogicalSize<f64>,
+        scale_factor: f64,
+    },
+}
+
 pub struct EventLoopWindowTarget<T: 'static> {
     receiver: Receiver<T>,
     sender_to_clone: Sender<T>,
@@ -69,7 +85,7 @@ impl<T: 'static> EventLoop<T> {
 
     pub fn run<F>(self, event_handler: F) -> !
     where
-        F: 'static + FnMut(Event<T>, &RootEventLoopWindowTarget<T>, &mut ControlFlow),
+        F: 'static + FnMut(Event<'_, T>, &RootEventLoopWindowTarget<T>, &mut ControlFlow),
     {
         unsafe {
             let application: *mut c_void = msg_send![class!(UIApplication), sharedApplication];
@@ -277,7 +293,7 @@ fn setup_control_flow_observers() {
 pub enum Never {}
 
 pub trait EventHandler: Debug {
-    fn handle_nonuser_event(&mut self, event: Event<Never>, control_flow: &mut ControlFlow);
+    fn handle_nonuser_event(&mut self, event: Event<'_, Never>, control_flow: &mut ControlFlow);
     fn handle_user_events(&mut self, control_flow: &mut ControlFlow);
 }
 
@@ -296,10 +312,10 @@ impl<F, T: 'static> Debug for EventLoopHandler<F, T> {
 
 impl<F, T> EventHandler for EventLoopHandler<F, T>
 where
-    F: 'static + FnMut(Event<T>, &RootEventLoopWindowTarget<T>, &mut ControlFlow),
+    F: 'static + FnMut(Event<'_, T>, &RootEventLoopWindowTarget<T>, &mut ControlFlow),
     T: 'static,
 {
-    fn handle_nonuser_event(&mut self, event: Event<Never>, control_flow: &mut ControlFlow) {
+    fn handle_nonuser_event(&mut self, event: Event<'_, Never>, control_flow: &mut ControlFlow) {
         (self.f)(
             event.map_nonuser_event().unwrap(),
             &self.event_loop,

src/platform_impl/ios/ffi.rs

@@ -4,7 +4,10 @@ use std::{convert::TryInto, ffi::CString, ops::BitOr, os::raw::*};
 
 use objc::{runtime::Object, Encode, Encoding};
 
-use crate::platform::ios::{Idiom, ScreenEdge, ValidOrientations};
+use crate::{
+    dpi::LogicalSize,
+    platform::ios::{Idiom, ScreenEdge, ValidOrientations},
+};
 
 pub type id = *mut Object;
 pub const nil: id = 0 as id;
@@ -39,6 +42,15 @@ pub struct CGSize {
     pub height: CGFloat,
 }
 
+impl CGSize {
+    pub fn new(size: LogicalSize<f64>) -> CGSize {
+        CGSize {
+            width: size.width as _,
+            height: size.height as _,
+        }
+    }
+}
+
 #[repr(C)]
 #[derive(Debug, Clone)]
 pub struct CGRect {
@@ -46,6 +58,12 @@ pub struct CGRect {
     pub size: CGSize,
 }
 
+impl CGRect {
+    pub fn new(origin: CGPoint, size: CGSize) -> CGRect {
+        CGRect { origin, size }
+    }
+}
+
 unsafe impl Encode for CGRect {
     fn encode() -> Encoding {
         unsafe {

src/platform_impl/ios/monitor.rs

@@ -88,7 +88,7 @@ impl VideoMode {
         }
     }
 
-    pub fn size(&self) -> PhysicalSize {
+    pub fn size(&self) -> PhysicalSize<u32> {
         self.size.into()
     }
 
@@ -171,16 +171,16 @@ impl fmt::Debug for MonitorHandle {
         #[derive(Debug)]
         struct MonitorHandle {
             name: Option<String>,
-            size: PhysicalSize,
-            position: PhysicalPosition,
-            hidpi_factor: f64,
+            size: PhysicalSize<u32>,
+            position: PhysicalPosition<i32>,
+            scale_factor: f64,
         }
 
         let monitor_id_proxy = MonitorHandle {
             name: self.name(),
             size: self.size(),
             position: self.position(),
-            hidpi_factor: self.hidpi_factor(),
+            scale_factor: self.scale_factor(),
         };
 
         monitor_id_proxy.fmt(f)
@@ -216,21 +216,21 @@ impl Inner {
         }
     }
 
-    pub fn size(&self) -> PhysicalSize {
+    pub fn size(&self) -> PhysicalSize<u32> {
         unsafe {
             let bounds: CGRect = msg_send![self.ui_screen(), nativeBounds];
-            (bounds.size.width as f64, bounds.size.height as f64).into()
+            PhysicalSize::new(bounds.size.width as u32, bounds.size.height as u32)
         }
     }
 
-    pub fn position(&self) -> PhysicalPosition {
+    pub fn position(&self) -> PhysicalPosition<i32> {
         unsafe {
             let bounds: CGRect = msg_send![self.ui_screen(), nativeBounds];
             (bounds.origin.x as f64, bounds.origin.y as f64).into()
         }
     }
 
-    pub fn hidpi_factor(&self) -> f64 {
+    pub fn scale_factor(&self) -> f64 {
         unsafe {
             let scale: CGFloat = msg_send![self.ui_screen(), nativeScale];
             scale as f64

src/platform_impl/ios/view.rs

@@ -10,7 +10,7 @@ use crate::{
     platform::ios::MonitorHandleExtIOS,
     platform_impl::platform::{
         app_state::{self, OSCapabilities},
-        event_loop,
+        event_loop::{self, EventProxy, EventWrapper},
         ffi::{
             id, nil, CGFloat, CGPoint, CGRect, UIForceTouchCapability, UIInterfaceOrientationMask,
             UIRectEdge, UITouchPhase, UITouchType,
@@ -103,8 +103,12 @@ unsafe fn get_view_class(root_view_class: &'static Class) -> &'static Class {
                 let window: id = msg_send![object, window];
                 assert!(!window.is_null());
                 app_state::handle_nonuser_events(
-                    std::iter::once(Event::RedrawRequested(RootWindowId(window.into())))
-                        .chain(std::iter::once(Event::RedrawEventsCleared)),
+                    std::iter::once(EventWrapper::StaticEvent(Event::RedrawRequested(
+                        RootWindowId(window.into()),
+                    )))
+                    .chain(std::iter::once(EventWrapper::StaticEvent(
+                        Event::RedrawEventsCleared,
+                    ))),
                 );
                 let superclass: &'static Class = msg_send![object, superclass];
                 let () = msg_send![super(object, superclass), drawRect: rect];
@@ -123,27 +127,29 @@ unsafe fn get_view_class(root_view_class: &'static Class) -> &'static Class {
                 let screen_space: id = msg_send![screen, coordinateSpace];
                 let screen_frame: CGRect =
                     msg_send![object, convertRect:bounds toCoordinateSpace:screen_space];
+                let dpi_factor: CGFloat = msg_send![screen, scale];
                 let size = crate::dpi::LogicalSize {
-                    width: screen_frame.size.width as _,
-                    height: screen_frame.size.height as _,
-                };
-                app_state::handle_nonuser_event(Event::WindowEvent {
+                    width: screen_frame.size.width as f64,
+                    height: screen_frame.size.height as f64,
+                }
+                .to_physical(dpi_factor.into());
+                app_state::handle_nonuser_event(EventWrapper::StaticEvent(Event::WindowEvent {
                     window_id: RootWindowId(window.into()),
                     event: WindowEvent::Resized(size),
-                });
+                }));
             }
         }
 
         extern "C" fn set_content_scale_factor(
             object: &mut Object,
             _: Sel,
-            untrusted_hidpi_factor: CGFloat,
+            untrusted_scale_factor: CGFloat,
         ) {
             unsafe {
                 let superclass: &'static Class = msg_send![object, superclass];
                 let () = msg_send![
                     super(object, superclass),
-                    setContentScaleFactor: untrusted_hidpi_factor
+                    setContentScaleFactor: untrusted_scale_factor
                 ];
 
                 let window: id = msg_send![object, window];
@@ -156,14 +162,15 @@ unsafe fn get_view_class(root_view_class: &'static Class) -> &'static Class {
                 // `setContentScaleFactor` may be called with a value of 0, which means "reset the
                 // content scale factor to a device-specific default value", so we can't use the
                 // parameter here. We can query the actual factor using the getter
-                let hidpi_factor: CGFloat = msg_send![object, contentScaleFactor];
+                let dpi_factor: CGFloat = msg_send![object, contentScaleFactor];
                 assert!(
-                    !hidpi_factor.is_nan()
-                        && hidpi_factor.is_finite()
-                        && hidpi_factor.is_sign_positive()
-                        && hidpi_factor > 0.0,
-                    "invalid hidpi_factor set on UIView",
+                    !dpi_factor.is_nan()
+                        && dpi_factor.is_finite()
+                        && dpi_factor.is_sign_positive()
+                        && dpi_factor > 0.0,
+                    "invalid scale_factor set on UIView",
                 );
+                let scale_factor: f64 = dpi_factor.into();
                 let bounds: CGRect = msg_send![object, bounds];
                 let screen: id = msg_send![window, screen];
                 let screen_space: id = msg_send![screen, coordinateSpace];
@@ -174,14 +181,17 @@ unsafe fn get_view_class(root_view_class: &'static Class) -> &'static Class {
                     height: screen_frame.size.height as _,
                 };
                 app_state::handle_nonuser_events(
-                    std::iter::once(Event::WindowEvent {
-                        window_id: RootWindowId(window.into()),
-                        event: WindowEvent::HiDpiFactorChanged(hidpi_factor as _),
-                    })
-                    .chain(std::iter::once(Event::WindowEvent {
-                        window_id: RootWindowId(window.into()),
-                        event: WindowEvent::Resized(size),
-                    })),
+                    std::iter::once(EventWrapper::EventProxy(EventProxy::DpiChangedProxy {
+                        window_id: window,
+                        scale_factor,
+                        suggested_size: size,
+                    }))
+                    .chain(std::iter::once(EventWrapper::StaticEvent(
+                        Event::WindowEvent {
+                            window_id: RootWindowId(window.into()),
+                            event: WindowEvent::Resized(size.to_physical(scale_factor)),
+                        },
+                    ))),
                 );
             }
         }
@@ -238,7 +248,7 @@ unsafe fn get_view_class(root_view_class: &'static Class) -> &'static Class {
                         _ => panic!("unexpected touch phase: {:?}", phase as i32),
                     };
 
-                    touch_events.push(Event::WindowEvent {
+                    touch_events.push(EventWrapper::StaticEvent(Event::WindowEvent {
                         window_id: RootWindowId(window.into()),
                         event: WindowEvent::Touch(Touch {
                             device_id: RootDeviceId(DeviceId { uiscreen }),
@@ -247,7 +257,7 @@ unsafe fn get_view_class(root_view_class: &'static Class) -> &'static Class {
                             force,
                             phase,
                         }),
-                    });
+                    }));
                 }
                 app_state::handle_nonuser_events(touch_events);
             }
@@ -367,20 +377,20 @@ unsafe fn get_window_class() -> &'static Class {
 
         extern "C" fn become_key_window(object: &Object, _: Sel) {
             unsafe {
-                app_state::handle_nonuser_event(Event::WindowEvent {
+                app_state::handle_nonuser_event(EventWrapper::StaticEvent(Event::WindowEvent {
                     window_id: RootWindowId(object.into()),
                     event: WindowEvent::Focused(true),
-                });
+                }));
                 let () = msg_send![super(object, class!(UIWindow)), becomeKeyWindow];
             }
         }
 
         extern "C" fn resign_key_window(object: &Object, _: Sel) {
             unsafe {
-                app_state::handle_nonuser_event(Event::WindowEvent {
+                app_state::handle_nonuser_event(EventWrapper::StaticEvent(Event::WindowEvent {
                     window_id: RootWindowId(object.into()),
                     event: WindowEvent::Focused(false),
-                });
+                }));
                 let () = msg_send![super(object, class!(UIWindow)), resignKeyWindow];
             }
         }
@@ -414,8 +424,8 @@ pub unsafe fn create_view(
     let view: id = msg_send![view, initWithFrame: frame];
     assert!(!view.is_null(), "Failed to initialize `UIView` instance");
     let () = msg_send![view, setMultipleTouchEnabled: YES];
-    if let Some(hidpi_factor) = platform_attributes.hidpi_factor {
-        let () = msg_send![view, setContentScaleFactor: hidpi_factor as CGFloat];
+    if let Some(scale_factor) = platform_attributes.scale_factor {
+        let () = msg_send![view, setContentScaleFactor: scale_factor as CGFloat];
     }
 
     view
@@ -518,11 +528,11 @@ pub fn create_delegate_class() {
     }
 
     extern "C" fn did_become_active(_: &Object, _: Sel, _: id) {
-        unsafe { app_state::handle_nonuser_event(Event::Resumed) }
+        unsafe { app_state::handle_nonuser_event(EventWrapper::StaticEvent(Event::Resumed)) }
     }
 
     extern "C" fn will_resign_active(_: &Object, _: Sel, _: id) {
-        unsafe { app_state::handle_nonuser_event(Event::Suspended) }
+        unsafe { app_state::handle_nonuser_event(EventWrapper::StaticEvent(Event::Suspended)) }
     }
 
     extern "C" fn will_enter_foreground(_: &Object, _: Sel, _: id) {}
@@ -541,10 +551,10 @@ pub fn create_delegate_class() {
                 }
                 let is_winit_window: BOOL = msg_send![window, isKindOfClass: class!(WinitUIWindow)];
                 if is_winit_window == YES {
-                    events.push(Event::WindowEvent {
+                    events.push(EventWrapper::StaticEvent(Event::WindowEvent {
                         window_id: RootWindowId(window.into()),
                         event: WindowEvent::Destroyed,
-                    });
+                    }));
                 }
             }
             app_state::handle_nonuser_events(events);

src/platform_impl/ios/window.rs

@@ -7,14 +7,15 @@ use std::{
 use objc::runtime::{Class, Object, BOOL, NO, YES};
 
 use crate::{
-    dpi::{self, LogicalPosition, LogicalSize},
+    dpi::{self, LogicalPosition, LogicalSize, PhysicalPosition, PhysicalSize, Position, Size},
     error::{ExternalError, NotSupportedError, OsError as RootOsError},
     event::{Event, WindowEvent},
     icon::Icon,
     monitor::MonitorHandle as RootMonitorHandle,
     platform::ios::{MonitorHandleExtIOS, ScreenEdge, ValidOrientations},
     platform_impl::platform::{
-        app_state, event_loop,
+        app_state,
+        event_loop::{self, EventProxy, EventWrapper},
         ffi::{
             id, CGFloat, CGPoint, CGRect, CGSize, UIEdgeInsets, UIInterfaceOrientationMask,
             UIRectEdge, UIScreenOverscanCompensation,
@@ -75,28 +76,34 @@ impl Inner {
         }
     }
 
-    pub fn inner_position(&self) -> Result<LogicalPosition, NotSupportedError> {
+    pub fn inner_position(&self) -> Result<PhysicalPosition<i32>, NotSupportedError> {
         unsafe {
             let safe_area = self.safe_area_screen_space();
-            Ok(LogicalPosition {
-                x: safe_area.origin.x as _,
-                y: safe_area.origin.y as _,
-            })
+            let position = LogicalPosition {
+                x: safe_area.origin.x as f64,
+                y: safe_area.origin.y as f64,
+            };
+            let dpi_factor = self.scale_factor();
+            Ok(position.to_physical(dpi_factor))
         }
     }
 
-    pub fn outer_position(&self) -> Result<LogicalPosition, NotSupportedError> {
+    pub fn outer_position(&self) -> Result<PhysicalPosition<i32>, NotSupportedError> {
         unsafe {
             let screen_frame = self.screen_frame();
-            Ok(LogicalPosition {
-                x: screen_frame.origin.x as _,
-                y: screen_frame.origin.y as _,
-            })
+            let position = LogicalPosition {
+                x: screen_frame.origin.x as f64,
+                y: screen_frame.origin.y as f64,
+            };
+            let dpi_factor = self.scale_factor();
+            Ok(position.to_physical(dpi_factor))
         }
     }
 
-    pub fn set_outer_position(&self, position: LogicalPosition) {
+    pub fn set_outer_position(&self, physical_position: Position) {
         unsafe {
+            let dpi_factor = self.scale_factor();
+            let position = physical_position.to_logical::<f64>(dpi_factor);
             let screen_frame = self.screen_frame();
             let new_screen_frame = CGRect {
                 origin: CGPoint {
@@ -110,35 +117,39 @@ impl Inner {
         }
     }
 
-    pub fn inner_size(&self) -> LogicalSize {
+    pub fn inner_size(&self) -> PhysicalSize<u32> {
         unsafe {
+            let dpi_factor = self.scale_factor();
             let safe_area = self.safe_area_screen_space();
-            LogicalSize {
-                width: safe_area.size.width as _,
-                height: safe_area.size.height as _,
-            }
+            let size = LogicalSize {
+                width: safe_area.size.width as f64,
+                height: safe_area.size.height as f64,
+            };
+            size.to_physical(dpi_factor)
         }
     }
 
-    pub fn outer_size(&self) -> LogicalSize {
+    pub fn outer_size(&self) -> PhysicalSize<u32> {
         unsafe {
+            let dpi_factor = self.scale_factor();
             let screen_frame = self.screen_frame();
-            LogicalSize {
-                width: screen_frame.size.width as _,
-                height: screen_frame.size.height as _,
-            }
+            let size = LogicalSize {
+                width: screen_frame.size.width as f64,
+                height: screen_frame.size.height as f64,
+            };
+            size.to_physical(dpi_factor)
         }
     }
 
-    pub fn set_inner_size(&self, _size: LogicalSize) {
+    pub fn set_inner_size(&self, _size: Size) {
         unimplemented!("not clear what `Window::set_inner_size` means on iOS");
     }
 
-    pub fn set_min_inner_size(&self, _dimensions: Option<LogicalSize>) {
+    pub fn set_min_inner_size(&self, _dimensions: Option<Size>) {
         warn!("`Window::set_min_inner_size` is ignored on iOS")
     }
 
-    pub fn set_max_inner_size(&self, _dimensions: Option<LogicalSize>) {
+    pub fn set_max_inner_size(&self, _dimensions: Option<Size>) {
         warn!("`Window::set_max_inner_size` is ignored on iOS")
     }
 
@@ -146,7 +157,7 @@ impl Inner {
         warn!("`Window::set_resizable` is ignored on iOS")
     }
 
-    pub fn hidpi_factor(&self) -> f64 {
+    pub fn scale_factor(&self) -> f64 {
         unsafe {
             let hidpi: CGFloat = msg_send![self.view, contentScaleFactor];
             hidpi as _
@@ -157,7 +168,7 @@ impl Inner {
         debug!("`Window::set_cursor_icon` ignored on iOS")
     }
 
-    pub fn set_cursor_position(&self, _position: LogicalPosition) -> Result<(), ExternalError> {
+    pub fn set_cursor_position(&self, _position: Position) -> Result<(), ExternalError> {
         Err(ExternalError::NotSupported(NotSupportedError::new()))
     }
 
@@ -243,7 +254,7 @@ impl Inner {
         warn!("`Window::set_window_icon` is ignored on iOS")
     }
 
-    pub fn set_ime_position(&self, _position: LogicalPosition) {
+    pub fn set_ime_position(&self, _position: Position) {
         warn!("`Window::set_ime_position` is ignored on iOS")
     }
 
@@ -343,13 +354,17 @@ impl Window {
             let screen_bounds: CGRect = msg_send![screen, bounds];
 
             let frame = match window_attributes.inner_size {
-                Some(dim) => CGRect {
-                    origin: screen_bounds.origin,
-                    size: CGSize {
-                        width: dim.width as _,
-                        height: dim.height as _,
-                    },
-                },
+                Some(dim) => {
+                    let dpi_factor = msg_send![screen, scale];
+                    let size = dim.to_logical::<f64>(dpi_factor);
+                    CGRect {
+                        origin: screen_bounds.origin,
+                        size: CGSize {
+                            width: size.width as _,
+                            height: size.height as _,
+                        },
+                    }
+                }
                 None => screen_bounds,
             };
 
@@ -383,10 +398,11 @@ impl Window {
             };
             app_state::set_key_window(window);
 
-            // Like the Windows and macOS backends, we send a `HiDpiFactorChanged` and `Resized`
+            // Like the Windows and macOS backends, we send a `ScaleFactorChanged` and `Resized`
             // event on window creation if the DPI factor != 1.0
-            let hidpi_factor: CGFloat = msg_send![view, contentScaleFactor];
-            if hidpi_factor != 1.0 {
+            let dpi_factor: CGFloat = msg_send![view, contentScaleFactor];
+            let scale_factor: f64 = dpi_factor.into();
+            if scale_factor != 1.0 {
                 let bounds: CGRect = msg_send![view, bounds];
                 let screen: id = msg_send![window, screen];
                 let screen_space: id = msg_send![screen, coordinateSpace];
@@ -397,14 +413,17 @@ impl Window {
                     height: screen_frame.size.height as _,
                 };
                 app_state::handle_nonuser_events(
-                    std::iter::once(Event::WindowEvent {
-                        window_id: RootWindowId(window.into()),
-                        event: WindowEvent::HiDpiFactorChanged(hidpi_factor as _),
-                    })
-                    .chain(std::iter::once(Event::WindowEvent {
-                        window_id: RootWindowId(window.into()),
-                        event: WindowEvent::Resized(size),
-                    })),
+                    std::iter::once(EventWrapper::EventProxy(EventProxy::DpiChangedProxy {
+                        window_id: window,
+                        scale_factor,
+                        suggested_size: size,
+                    }))
+                    .chain(std::iter::once(EventWrapper::StaticEvent(
+                        Event::WindowEvent {
+                            window_id: RootWindowId(window.into()),
+                            event: WindowEvent::Resized(size.to_physical(scale_factor)),
+                        },
+                    ))),
                 );
             }
 
@@ -425,14 +444,14 @@ impl Inner {
         self.view
     }
 
-    pub fn set_hidpi_factor(&self, hidpi_factor: f64) {
+    pub fn set_scale_factor(&self, scale_factor: f64) {
         unsafe {
             assert!(
-                dpi::validate_hidpi_factor(hidpi_factor),
-                "`WindowExtIOS::set_hidpi_factor` received an invalid hidpi factor"
+                dpi::validate_scale_factor(scale_factor),
+                "`WindowExtIOS::set_scale_factor` received an invalid hidpi factor"
             );
-            let hidpi_factor = hidpi_factor as CGFloat;
-            let () = msg_send![self.view, setContentScaleFactor: hidpi_factor];
+            let scale_factor = scale_factor as CGFloat;
+            let () = msg_send![self.view, setContentScaleFactor: scale_factor];
         }
     }
 
@@ -598,7 +617,7 @@ impl From<id> for WindowId {
 #[derive(Clone)]
 pub struct PlatformSpecificWindowBuilderAttributes {
     pub root_view_class: &'static Class,
-    pub hidpi_factor: Option<f64>,
+    pub scale_factor: Option<f64>,
     pub valid_orientations: ValidOrientations,
     pub prefers_home_indicator_hidden: bool,
     pub prefers_status_bar_hidden: bool,
@@ -609,7 +628,7 @@ impl Default for PlatformSpecificWindowBuilderAttributes {
     fn default() -> PlatformSpecificWindowBuilderAttributes {
         PlatformSpecificWindowBuilderAttributes {
             root_view_class: class!(UIView),
-            hidpi_factor: None,
+            scale_factor: None,
             valid_orientations: Default::default(),
             prefers_home_indicator_hidden: false,
             prefers_status_bar_hidden: false,

src/platform_impl/linux/mod.rs

@@ -7,11 +7,9 @@ use raw_window_handle::RawWindowHandle;
 use smithay_client_toolkit::reexports::client::ConnectError;
 
 pub use self::x11::XNotSupported;
-use self::x11::{
-    ffi::XVisualInfo, get_xtarget, util::WindowType as XWindowType, XConnection, XError,
-};
+use self::x11::{ffi::XVisualInfo, util::WindowType as XWindowType, XConnection, XError};
 use crate::{
-    dpi::{LogicalPosition, LogicalSize, PhysicalPosition, PhysicalSize},
+    dpi::{PhysicalPosition, PhysicalSize, Position, Size},
     error::{ExternalError, NotSupportedError, OsError as RootOsError},
     event::Event,
     event_loop::{ControlFlow, EventLoopClosed, EventLoopWindowTarget as RootELW},
@@ -36,8 +34,8 @@ const BACKEND_PREFERENCE_ENV_VAR: &str = "WINIT_UNIX_BACKEND";
 pub struct PlatformSpecificWindowBuilderAttributes {
     pub visual_infos: Option<XVisualInfo>,
     pub screen_id: Option<i32>,
-    pub resize_increments: Option<(u32, u32)>,
-    pub base_size: Option<(u32, u32)>,
+    pub resize_increments: Option<Size>,
+    pub base_size: Option<Size>,
     pub class: Option<(String, String)>,
     pub override_redirect: bool,
     pub x11_window_types: Vec<XWindowType>,
@@ -134,7 +132,7 @@ impl MonitorHandle {
     }
 
     #[inline]
-    pub fn size(&self) -> PhysicalSize {
+    pub fn size(&self) -> PhysicalSize<u32> {
         match self {
             &MonitorHandle::X(ref m) => m.size(),
             &MonitorHandle::Wayland(ref m) => m.size(),
@@ -142,7 +140,7 @@ impl MonitorHandle {
     }
 
     #[inline]
-    pub fn position(&self) -> PhysicalPosition {
+    pub fn position(&self) -> PhysicalPosition<i32> {
         match self {
             &MonitorHandle::X(ref m) => m.position(),
             &MonitorHandle::Wayland(ref m) => m.position(),
@@ -150,10 +148,10 @@ impl MonitorHandle {
     }
 
     #[inline]
-    pub fn hidpi_factor(&self) -> f64 {
+    pub fn scale_factor(&self) -> f64 {
         match self {
-            &MonitorHandle::X(ref m) => m.hidpi_factor(),
-            &MonitorHandle::Wayland(ref m) => m.hidpi_factor() as f64,
+            &MonitorHandle::X(ref m) => m.scale_factor(),
+            &MonitorHandle::Wayland(ref m) => m.scale_factor() as f64,
         }
     }
 
@@ -174,7 +172,7 @@ pub enum VideoMode {
 
 impl VideoMode {
     #[inline]
-    pub fn size(&self) -> PhysicalSize {
+    pub fn size(&self) -> PhysicalSize<u32> {
         match self {
             &VideoMode::X(ref m) => m.size(),
             &VideoMode::Wayland(ref m) => m.size(),
@@ -248,7 +246,7 @@ impl Window {
     }
 
     #[inline]
-    pub fn outer_position(&self) -> Result<LogicalPosition, NotSupportedError> {
+    pub fn outer_position(&self) -> Result<PhysicalPosition<i32>, NotSupportedError> {
         match self {
             &Window::X(ref w) => w.outer_position(),
             &Window::Wayland(ref w) => w.outer_position(),
@@ -256,7 +254,7 @@ impl Window {
     }
 
     #[inline]
-    pub fn inner_position(&self) -> Result<LogicalPosition, NotSupportedError> {
+    pub fn inner_position(&self) -> Result<PhysicalPosition<i32>, NotSupportedError> {
         match self {
             &Window::X(ref m) => m.inner_position(),
             &Window::Wayland(ref m) => m.inner_position(),
@@ -264,7 +262,7 @@ impl Window {
     }
 
     #[inline]
-    pub fn set_outer_position(&self, position: LogicalPosition) {
+    pub fn set_outer_position(&self, position: Position) {
         match self {
             &Window::X(ref w) => w.set_outer_position(position),
             &Window::Wayland(ref w) => w.set_outer_position(position),
@@ -272,7 +270,7 @@ impl Window {
     }
 
     #[inline]
-    pub fn inner_size(&self) -> LogicalSize {
+    pub fn inner_size(&self) -> PhysicalSize<u32> {
         match self {
             &Window::X(ref w) => w.inner_size(),
             &Window::Wayland(ref w) => w.inner_size(),
@@ -280,7 +278,7 @@ impl Window {
     }
 
     #[inline]
-    pub fn outer_size(&self) -> LogicalSize {
+    pub fn outer_size(&self) -> PhysicalSize<u32> {
         match self {
             &Window::X(ref w) => w.outer_size(),
             &Window::Wayland(ref w) => w.outer_size(),
@@ -288,7 +286,7 @@ impl Window {
     }
 
     #[inline]
-    pub fn set_inner_size(&self, size: LogicalSize) {
+    pub fn set_inner_size(&self, size: Size) {
         match self {
             &Window::X(ref w) => w.set_inner_size(size),
             &Window::Wayland(ref w) => w.set_inner_size(size),
@@ -296,7 +294,7 @@ impl Window {
     }
 
     #[inline]
-    pub fn set_min_inner_size(&self, dimensions: Option<LogicalSize>) {
+    pub fn set_min_inner_size(&self, dimensions: Option<Size>) {
         match self {
             &Window::X(ref w) => w.set_min_inner_size(dimensions),
             &Window::Wayland(ref w) => w.set_min_inner_size(dimensions),
@@ -304,7 +302,7 @@ impl Window {
     }
 
     #[inline]
-    pub fn set_max_inner_size(&self, dimensions: Option<LogicalSize>) {
+    pub fn set_max_inner_size(&self, dimensions: Option<Size>) {
         match self {
             &Window::X(ref w) => w.set_max_inner_size(dimensions),
             &Window::Wayland(ref w) => w.set_max_inner_size(dimensions),
@@ -344,15 +342,15 @@ impl Window {
     }
 
     #[inline]
-    pub fn hidpi_factor(&self) -> f64 {
+    pub fn scale_factor(&self) -> f64 {
         match self {
-            &Window::X(ref w) => w.hidpi_factor(),
-            &Window::Wayland(ref w) => w.hidpi_factor() as f64,
+            &Window::X(ref w) => w.scale_factor(),
+            &Window::Wayland(ref w) => w.scale_factor() as f64,
         }
     }
 
     #[inline]
-    pub fn set_cursor_position(&self, position: LogicalPosition) -> Result<(), ExternalError> {
+    pub fn set_cursor_position(&self, position: Position) -> Result<(), ExternalError> {
         match self {
             &Window::X(ref w) => w.set_cursor_position(position),
             &Window::Wayland(ref w) => w.set_cursor_position(position),
@@ -416,7 +414,7 @@ impl Window {
     }
 
     #[inline]
-    pub fn set_ime_position(&self, position: LogicalPosition) {
+    pub fn set_ime_position(&self, position: Position) {
         match self {
             &Window::X(ref w) => w.set_ime_position(position),
             &Window::Wayland(_) => (),
@@ -603,7 +601,7 @@ impl<T: 'static> EventLoop<T> {
                 .into_iter()
                 .map(MonitorHandle::Wayland)
                 .collect(),
-            EventLoop::X(ref evlp) => get_xtarget(&evlp.target)
+            EventLoop::X(ref evlp) => evlp
                 .x_connection()
                 .available_monitors()
                 .into_iter()
@@ -616,9 +614,7 @@ impl<T: 'static> EventLoop<T> {
     pub fn primary_monitor(&self) -> MonitorHandle {
         match *self {
             EventLoop::Wayland(ref evlp) => MonitorHandle::Wayland(evlp.primary_monitor()),
-            EventLoop::X(ref evlp) => {
-                MonitorHandle::X(get_xtarget(&evlp.target).x_connection().primary_monitor())
-            }
+            EventLoop::X(ref evlp) => MonitorHandle::X(evlp.x_connection().primary_monitor()),
         }
     }
 
@@ -631,7 +627,7 @@ impl<T: 'static> EventLoop<T> {
 
     pub fn run_return<F>(&mut self, callback: F)
     where
-        F: FnMut(crate::event::Event<T>, &RootELW<T>, &mut ControlFlow),
+        F: FnMut(crate::event::Event<'_, T>, &RootELW<T>, &mut ControlFlow),
     {
         match *self {
             EventLoop::Wayland(ref mut evlp) => evlp.run_return(callback),
@@ -641,7 +637,7 @@ impl<T: 'static> EventLoop<T> {
 
     pub fn run<F>(self, callback: F) -> !
     where
-        F: 'static + FnMut(crate::event::Event<T>, &RootELW<T>, &mut ControlFlow),
+        F: 'static + FnMut(crate::event::Event<'_, T>, &RootELW<T>, &mut ControlFlow),
     {
         match self {
             EventLoop::Wayland(evlp) => evlp.run(callback),
@@ -682,12 +678,12 @@ impl<T> EventLoopWindowTarget<T> {
 }
 
 fn sticky_exit_callback<T, F>(
-    evt: Event<T>,
+    evt: Event<'_, T>,
     target: &RootELW<T>,
     control_flow: &mut ControlFlow,
     callback: &mut F,
 ) where
-    F: FnMut(Event<T>, &RootELW<T>, &mut ControlFlow),
+    F: FnMut(Event<'_, T>, &RootELW<T>, &mut ControlFlow),
 {
     // make ControlFlow::Exit sticky by providing a dummy
     // control flow reference if it is already Exit.

src/platform_impl/linux/wayland/event_loop.rs

@@ -2,11 +2,16 @@ use std::{
     cell::RefCell,
     collections::VecDeque,
     fmt,
+    io::ErrorKind,
     rc::Rc,
     sync::{Arc, Mutex},
-    time::Instant,
+    time::{Duration, Instant},
 };
 
+use mio::{Events, Poll, PollOpt, Ready, Token};
+
+use mio_extras::channel::{channel, Receiver, SendError, Sender};
+
 use smithay_client_toolkit::reexports::protocols::unstable::pointer_constraints::v1::client::{
     zwp_locked_pointer_v1::ZwpLockedPointerV1, zwp_pointer_constraints_v1::ZwpPointerConstraintsV1,
 };
@@ -21,15 +26,17 @@ use smithay_client_toolkit::reexports::client::protocol::{
 };
 
 use crate::{
-    dpi::{PhysicalPosition, PhysicalSize},
-    event::ModifiersState,
+    dpi::{LogicalSize, PhysicalPosition, PhysicalSize},
+    event::{
+        DeviceEvent, DeviceId as RootDeviceId, Event, ModifiersState, StartCause, WindowEvent,
+    },
     event_loop::{ControlFlow, EventLoopClosed, EventLoopWindowTarget as RootELW},
     monitor::{MonitorHandle as RootMonitorHandle, VideoMode as RootVideoMode},
     platform_impl::platform::{
-        sticky_exit_callback, MonitorHandle as PlatformMonitorHandle,
-        VideoMode as PlatformVideoMode,
+        sticky_exit_callback, DeviceId as PlatformDeviceId, MonitorHandle as PlatformMonitorHandle,
+        VideoMode as PlatformVideoMode, WindowId as PlatformWindowId,
     },
-    window::CursorIcon,
+    window::{CursorIcon, WindowId as RootWindowId},
 };
 
 use super::{window::WindowStore, DeviceId, WindowId};
@@ -43,43 +50,37 @@ use smithay_client_toolkit::{
     Environment,
 };
 
-pub struct WindowEventsSink<T> {
-    buffer: VecDeque<crate::event::Event<T>>,
+const KBD_TOKEN: Token = Token(0);
+const USER_TOKEN: Token = Token(1);
+const EVQ_TOKEN: Token = Token(2);
+
+#[derive(Clone)]
+pub struct EventsSink {
+    sender: Sender<Event<'static, ()>>,
 }
 
-impl<T> WindowEventsSink<T> {
-    pub fn new() -> WindowEventsSink<T> {
-        WindowEventsSink {
-            buffer: VecDeque::new(),
-        }
+impl EventsSink {
+    pub fn new(sender: Sender<Event<'static, ()>>) -> EventsSink {
+        EventsSink { sender }
     }
 
-    pub fn send_event(&mut self, evt: crate::event::Event<T>) {
-        self.buffer.push_back(evt);
+    pub fn send_event(&self, event: Event<'static, ()>) {
+        self.sender.send(event).unwrap()
     }
 
-    pub fn send_window_event(&mut self, evt: crate::event::WindowEvent, wid: WindowId) {
-        self.buffer.push_back(crate::event::Event::WindowEvent {
-            event: evt,
-            window_id: crate::window::WindowId(crate::platform_impl::WindowId::Wayland(wid)),
+    pub fn send_device_event(&self, event: DeviceEvent, device_id: DeviceId) {
+        self.send_event(Event::DeviceEvent {
+            event,
+            device_id: RootDeviceId(PlatformDeviceId::Wayland(device_id)),
         });
     }
 
-    pub fn send_device_event(&mut self, evt: crate::event::DeviceEvent, dev_id: DeviceId) {
-        self.buffer.push_back(crate::event::Event::DeviceEvent {
-            event: evt,
-            device_id: crate::event::DeviceId(crate::platform_impl::DeviceId::Wayland(dev_id)),
+    pub fn send_window_event(&self, event: WindowEvent<'static>, window_id: WindowId) {
+        self.send_event(Event::WindowEvent {
+            event,
+            window_id: RootWindowId(PlatformWindowId::Wayland(window_id)),
         });
     }
-
-    fn empty_with<F>(&mut self, mut callback: F)
-    where
-        F: FnMut(crate::event::Event<T>),
-    {
-        for evt in self.buffer.drain(..) {
-            callback(evt)
-        }
-    }
 }
 
 pub struct CursorManager {
@@ -230,21 +231,17 @@ impl CursorManager {
 }
 
 pub struct EventLoop<T: 'static> {
-    // The loop
-    inner_loop: ::calloop::EventLoop<()>,
+    // Poll instance
+    poll: Poll,
     // The wayland display
     pub display: Arc<Display>,
     // The output manager
     pub outputs: OutputMgr,
-    // Our sink, shared with some handlers, buffering the events
-    sink: Arc<Mutex<WindowEventsSink<T>>>,
-    pending_user_events: Rc<RefCell<VecDeque<T>>>,
     // The cursor manager
     cursor_manager: Arc<Mutex<CursorManager>>,
-    // Utility for grabbing the cursor and changing visibility
-    _user_source: ::calloop::Source<::calloop::channel::Channel<T>>,
-    user_sender: ::calloop::channel::Sender<T>,
-    _kbd_source: ::calloop::Source<::calloop::channel::Channel<crate::event::Event<()>>>,
+    kbd_channel: Receiver<Event<'static, ()>>,
+    user_channel: Receiver<T>,
+    user_sender: Sender<T>,
     window_target: RootELW<T>,
 }
 
@@ -252,12 +249,12 @@ pub struct EventLoop<T: 'static> {
 //
 // We should only try and wake up the `EventLoop` if it still exists, so we hold Weak ptrs.
 pub struct EventLoopProxy<T: 'static> {
-    user_sender: calloop::channel::Sender<T>,
+    user_sender: Sender<T>,
 }
 
 pub struct EventLoopWindowTarget<T> {
-    // The event queue
-    pub evq: RefCell<::calloop::Source<EventQueue>>,
+    // the event queue
+    pub evq: RefCell<EventQueue>,
     // The window store
     pub store: Arc<Mutex<WindowStore>>,
     // The cursor manager
@@ -284,7 +281,7 @@ impl<T: 'static> Clone for EventLoopProxy<T> {
 impl<T: 'static> EventLoopProxy<T> {
     pub fn send_event(&self, event: T) -> Result<(), EventLoopClosed<T>> {
         self.user_sender.send(event).map_err(|e| {
-            EventLoopClosed(if let ::calloop::channel::SendError::Disconnected(x) = e {
+            EventLoopClosed(if let SendError::Disconnected(x) = e {
                 x
             } else {
                 unreachable!()
@@ -298,33 +295,26 @@ impl<T: 'static> EventLoop<T> {
         let (display, mut event_queue) = Display::connect_to_env()?;
 
         let display = Arc::new(display);
-        let sink = Arc::new(Mutex::new(WindowEventsSink::new()));
         let store = Arc::new(Mutex::new(WindowStore::new()));
         let seats = Arc::new(Mutex::new(Vec::new()));
 
-        let inner_loop = ::calloop::EventLoop::new().unwrap();
+        let poll = Poll::new().unwrap();
 
-        let (kbd_sender, kbd_channel) = ::calloop::channel::channel::<crate::event::Event<()>>();
-        let kbd_sink = sink.clone();
-        let kbd_source = inner_loop
-            .handle()
-            .insert_source(kbd_channel, move |evt, &mut ()| {
-                if let ::calloop::channel::Event::Msg(evt) = evt {
-                    let evt = evt.map_nonuser_event().ok().unwrap();
-                    kbd_sink.lock().unwrap().send_event(evt);
-                }
-            })
+        let (kbd_sender, kbd_channel) = channel();
+
+        let sink = EventsSink::new(kbd_sender);
+
+        poll.register(&kbd_channel, KBD_TOKEN, Ready::readable(), PollOpt::level())
             .unwrap();
 
         let pointer_constraints_proxy = Arc::new(Mutex::new(None));
 
         let mut seat_manager = SeatManager {
-            sink: sink.clone(),
-            relative_pointer_manager_proxy: Rc::new(RefCell::new(None)),
-            pointer_constraints_proxy: pointer_constraints_proxy.clone(),
+            sink,
             store: store.clone(),
             seats: seats.clone(),
-            kbd_sender,
+            relative_pointer_manager_proxy: Rc::new(RefCell::new(None)),
+            pointer_constraints_proxy: pointer_constraints_proxy.clone(),
             cursor_manager: Arc::new(Mutex::new(CursorManager::new(pointer_constraints_proxy))),
         };
 
@@ -404,39 +394,31 @@ impl<T: 'static> EventLoop<T> {
         )
         .unwrap();
 
-        let source = inner_loop
-            .handle()
-            .insert_source(event_queue, |(), &mut ()| {})
+        poll.register(&event_queue, EVQ_TOKEN, Ready::readable(), PollOpt::level())
             .unwrap();
 
-        let pending_user_events = Rc::new(RefCell::new(VecDeque::new()));
-        let pending_user_events2 = pending_user_events.clone();
+        let (user_sender, user_channel) = channel();
 
-        let (user_sender, user_channel) = ::calloop::channel::channel();
-
-        let user_source = inner_loop
-            .handle()
-            .insert_source(user_channel, move |evt, &mut ()| {
-                if let ::calloop::channel::Event::Msg(msg) = evt {
-                    pending_user_events2.borrow_mut().push_back(msg);
-                }
-            })
-            .unwrap();
+        poll.register(
+            &user_channel,
+            USER_TOKEN,
+            Ready::readable(),
+            PollOpt::level(),
+        )
+        .unwrap();
 
         let cursor_manager_clone = cursor_manager.clone();
         Ok(EventLoop {
-            inner_loop,
-            sink,
-            pending_user_events,
+            poll,
             display: display.clone(),
             outputs: env.outputs.clone(),
-            _user_source: user_source,
             user_sender,
+            user_channel,
+            kbd_channel,
             cursor_manager,
-            _kbd_source: kbd_source,
             window_target: RootELW {
                 p: crate::platform_impl::EventLoopWindowTarget::Wayland(EventLoopWindowTarget {
-                    evq: RefCell::new(source),
+                    evq: RefCell::new(event_queue),
                     store,
                     env,
                     cursor_manager: cursor_manager_clone,
@@ -458,7 +440,7 @@ impl<T: 'static> EventLoop<T> {
 
     pub fn run<F>(mut self, callback: F) -> !
     where
-        F: 'static + FnMut(crate::event::Event<T>, &RootELW<T>, &mut ControlFlow),
+        F: 'static + FnMut(Event<'_, T>, &RootELW<T>, &mut ControlFlow),
     {
         self.run_return(callback);
         std::process::exit(0);
@@ -466,53 +448,60 @@ impl<T: 'static> EventLoop<T> {
 
     pub fn run_return<F>(&mut self, mut callback: F)
     where
-        F: FnMut(crate::event::Event<T>, &RootELW<T>, &mut ControlFlow),
+        F: FnMut(Event<'_, T>, &RootELW<T>, &mut ControlFlow),
     {
         // send pending events to the server
         self.display.flush().expect("Wayland connection lost.");
 
         let mut control_flow = ControlFlow::default();
-
-        let sink = self.sink.clone();
-        let user_events = self.pending_user_events.clone();
+        let mut events = Events::with_capacity(8);
 
         callback(
-            crate::event::Event::NewEvents(crate::event::StartCause::Init),
+            Event::NewEvents(StartCause::Init),
             &self.window_target,
             &mut control_flow,
         );
 
         loop {
-            self.post_dispatch_triggers();
+            // Read events from the event queue
+            {
+                let mut evq = get_target(&self.window_target).evq.borrow_mut();
 
-            // empty buffer of events
-            {
-                let mut guard = sink.lock().unwrap();
-                guard.empty_with(|evt| {
-                    sticky_exit_callback(
-                        evt,
-                        &self.window_target,
-                        &mut control_flow,
-                        &mut callback,
-                    );
-                });
-            }
-            // empty user events
-            {
-                let mut guard = user_events.borrow_mut();
-                for evt in guard.drain(..) {
-                    sticky_exit_callback(
-                        crate::event::Event::UserEvent(evt),
-                        &self.window_target,
-                        &mut control_flow,
-                        &mut callback,
-                    );
+                evq.dispatch_pending()
+                    .expect("failed to dispatch wayland events");
+
+                if let Some(read) = evq.prepare_read() {
+                    if let Err(e) = read.read_events() {
+                        if e.kind() != ErrorKind::WouldBlock {
+                            panic!("failed to read wayland events: {}", e);
+                        }
+                    }
+
+                    evq.dispatch_pending()
+                        .expect("failed to dispatch wayland events");
                 }
             }
+
+            self.post_dispatch_triggers(&mut callback, &mut control_flow);
+
+            while let Ok(event) = self.kbd_channel.try_recv() {
+                let event = event.map_nonuser_event().unwrap();
+                sticky_exit_callback(event, &self.window_target, &mut control_flow, &mut callback);
+            }
+
+            while let Ok(event) = self.user_channel.try_recv() {
+                sticky_exit_callback(
+                    Event::UserEvent(event),
+                    &self.window_target,
+                    &mut control_flow,
+                    &mut callback,
+                );
+            }
+
             // send Events cleared
             {
                 sticky_exit_callback(
-                    crate::event::Event::MainEventsCleared,
+                    Event::MainEventsCleared,
                     &self.window_target,
                     &mut control_flow,
                     &mut callback,
@@ -523,7 +512,7 @@ impl<T: 'static> EventLoop<T> {
             {
                 self.redraw_triggers(|wid, window_target| {
                     sticky_exit_callback(
-                        crate::event::Event::RedrawRequested(crate::window::WindowId(
+                        Event::RedrawRequested(crate::window::WindowId(
                             crate::platform_impl::WindowId::Wayland(wid),
                         )),
                         window_target,
@@ -536,7 +525,7 @@ impl<T: 'static> EventLoop<T> {
             // send RedrawEventsCleared
             {
                 sticky_exit_callback(
-                    crate::event::Event::RedrawEventsCleared,
+                    Event::RedrawEventsCleared,
                     &self.window_target,
                     &mut control_flow,
                     &mut callback,
@@ -569,24 +558,25 @@ impl<T: 'static> EventLoop<T> {
                 ControlFlow::Exit => break,
                 ControlFlow::Poll => {
                     // non-blocking dispatch
-                    self.inner_loop
-                        .dispatch(Some(::std::time::Duration::from_millis(0)), &mut ())
+                    self.poll
+                        .poll(&mut events, Some(Duration::from_millis(0)))
                         .unwrap();
+                    events.clear();
+
                     callback(
-                        crate::event::Event::NewEvents(crate::event::StartCause::Poll),
+                        Event::NewEvents(StartCause::Poll),
                         &self.window_target,
                         &mut control_flow,
                     );
                 }
                 ControlFlow::Wait => {
-                    let timeout = if instant_wakeup {
-                        Some(::std::time::Duration::from_millis(0))
-                    } else {
-                        None
-                    };
-                    self.inner_loop.dispatch(timeout, &mut ()).unwrap();
+                    if !instant_wakeup {
+                        self.poll.poll(&mut events, None).unwrap();
+                        events.clear();
+                    }
+
                     callback(
-                        crate::event::Event::NewEvents(crate::event::StartCause::WaitCancelled {
+                        Event::NewEvents(StartCause::WaitCancelled {
                             start: Instant::now(),
                             requested_resume: None,
                         }),
@@ -600,29 +590,27 @@ impl<T: 'static> EventLoop<T> {
                     let duration = if deadline > start && !instant_wakeup {
                         deadline - start
                     } else {
-                        ::std::time::Duration::from_millis(0)
+                        Duration::from_millis(0)
                     };
-                    self.inner_loop.dispatch(Some(duration), &mut ()).unwrap();
+                    self.poll.poll(&mut events, Some(duration)).unwrap();
+                    events.clear();
+
                     let now = Instant::now();
                     if now < deadline {
                         callback(
-                            crate::event::Event::NewEvents(
-                                crate::event::StartCause::WaitCancelled {
-                                    start,
-                                    requested_resume: Some(deadline),
-                                },
-                            ),
+                            Event::NewEvents(StartCause::WaitCancelled {
+                                start,
+                                requested_resume: Some(deadline),
+                            }),
                             &self.window_target,
                             &mut control_flow,
                         );
                     } else {
                         callback(
-                            crate::event::Event::NewEvents(
-                                crate::event::StartCause::ResumeTimeReached {
-                                    start,
-                                    requested_resume: deadline,
-                                },
-                            ),
+                            Event::NewEvents(StartCause::ResumeTimeReached {
+                                start,
+                                requested_resume: deadline,
+                            }),
                             &self.window_target,
                             &mut control_flow,
                         );
@@ -631,11 +619,7 @@ impl<T: 'static> EventLoop<T> {
             }
         }
 
-        callback(
-            crate::event::Event::LoopDestroyed,
-            &self.window_target,
-            &mut control_flow,
-        );
+        callback(Event::LoopDestroyed, &self.window_target, &mut control_flow);
     }
 
     pub fn primary_monitor(&self) -> MonitorHandle {
@@ -687,12 +671,19 @@ impl<T> EventLoop<T> {
         )
     }
 
-    fn post_dispatch_triggers(&mut self) {
-        let mut sink = self.sink.lock().unwrap();
+    fn post_dispatch_triggers<F>(&mut self, mut callback: F, control_flow: &mut ControlFlow)
+    where
+        F: FnMut(Event<'_, T>, &RootELW<T>, &mut ControlFlow),
+    {
         let window_target = match self.window_target.p {
             crate::platform_impl::EventLoopWindowTarget::Wayland(ref wt) => wt,
             _ => unreachable!(),
         };
+
+        let mut callback = |event: Event<'_, T>| {
+            sticky_exit_callback(event, &self.window_target, control_flow, &mut callback);
+        };
+
         // prune possible dead windows
         {
             let mut cleanup_needed = window_target.cleanup_needed.lock().unwrap();
@@ -700,41 +691,65 @@ impl<T> EventLoop<T> {
                 let pruned = window_target.store.lock().unwrap().cleanup();
                 *cleanup_needed = false;
                 for wid in pruned {
-                    sink.send_window_event(crate::event::WindowEvent::Destroyed, wid);
+                    callback(Event::WindowEvent {
+                        window_id: crate::window::WindowId(
+                            crate::platform_impl::WindowId::Wayland(wid),
+                        ),
+                        event: WindowEvent::Destroyed,
+                    });
                 }
             }
         }
         // process pending resize/refresh
         window_target.store.lock().unwrap().for_each(|window| {
+            let window_id =
+                crate::window::WindowId(crate::platform_impl::WindowId::Wayland(window.wid));
             if let Some(frame) = window.frame {
-                if let Some(newsize) = window.newsize {
-                    let (w, h) = newsize;
+                if let Some((w, h)) = window.newsize {
                     // mutter (GNOME Wayland) relies on `set_geometry` to reposition window in case
                     // it overlaps mutter's `bounding box`, so we can't avoid this resize call,
                     // which calls `set_geometry` under the hood, for now.
                     frame.resize(w, h);
                     frame.refresh();
+
                     // Don't send resize event downstream if the new size is identical to the
                     // current one.
-                    if newsize != *window.size {
+                    if (w, h) != *window.size {
                         let logical_size = crate::dpi::LogicalSize::new(w as f64, h as f64);
-                        sink.send_window_event(
-                            crate::event::WindowEvent::Resized(logical_size),
-                            window.wid,
-                        );
+                        let physical_size = logical_size
+                            .to_physical(window.new_dpi.unwrap_or(window.prev_dpi) as f64);
 
+                        callback(Event::WindowEvent {
+                            window_id,
+                            event: WindowEvent::Resized(physical_size),
+                        });
                         *window.size = (w, h);
                     }
                 }
-            }
-            if let Some(dpi) = window.new_dpi {
-                sink.send_window_event(
-                    crate::event::WindowEvent::HiDpiFactorChanged(dpi as f64),
-                    window.wid,
-                );
+
+                if let Some(dpi) = window.new_dpi {
+                    let dpi = dpi as f64;
+                    let logical_size = LogicalSize::<f64>::from(*window.size);
+                    let mut new_inner_size = logical_size.to_physical(dpi);
+
+                    callback(Event::WindowEvent {
+                        window_id,
+                        event: WindowEvent::ScaleFactorChanged {
+                            scale_factor: dpi,
+                            new_inner_size: &mut new_inner_size,
+                        },
+                    });
+
+                    let (w, h) = new_inner_size.to_logical::<u32>(dpi).into();
+                    frame.resize(w, h);
+                    *window.size = (w, h);
+                }
             }
             if window.closed {
-                sink.send_window_event(crate::event::WindowEvent::CloseRequested, window.wid);
+                callback(Event::WindowEvent {
+                    window_id,
+                    event: WindowEvent::CloseRequested,
+                });
             }
 
             if let Some(grab_cursor) = window.grab_cursor {
@@ -749,21 +764,27 @@ impl<T> EventLoop<T> {
     }
 }
 
+fn get_target<T>(target: &RootELW<T>) -> &EventLoopWindowTarget<T> {
+    match target.p {
+        crate::platform_impl::EventLoopWindowTarget::Wayland(ref wt) => wt,
+        _ => unreachable!(),
+    }
+}
+
 /*
  * Wayland protocol implementations
  */
 
-struct SeatManager<T: 'static> {
-    sink: Arc<Mutex<WindowEventsSink<T>>>,
+struct SeatManager {
+    sink: EventsSink,
     store: Arc<Mutex<WindowStore>>,
     seats: Arc<Mutex<Vec<(u32, wl_seat::WlSeat)>>>,
-    kbd_sender: ::calloop::channel::Sender<crate::event::Event<()>>,
     relative_pointer_manager_proxy: Rc<RefCell<Option<ZwpRelativePointerManagerV1>>>,
     pointer_constraints_proxy: Arc<Mutex<Option<ZwpPointerConstraintsV1>>>,
     cursor_manager: Arc<Mutex<CursorManager>>,
 }
 
-impl<T: 'static> SeatManager<T> {
+impl SeatManager {
     fn add_seat(&mut self, id: u32, version: u32, registry: wl_registry::WlRegistry) {
         use std::cmp::min;
 
@@ -775,7 +796,6 @@ impl<T: 'static> SeatManager<T> {
             relative_pointer_manager_proxy: self.relative_pointer_manager_proxy.clone(),
             keyboard: None,
             touch: None,
-            kbd_sender: self.kbd_sender.clone(),
             modifiers_tracker: Arc::new(Mutex::new(ModifiersState::default())),
             cursor_manager: self.cursor_manager.clone(),
         };
@@ -799,10 +819,9 @@ impl<T: 'static> SeatManager<T> {
     }
 }
 
-struct SeatData<T> {
-    sink: Arc<Mutex<WindowEventsSink<T>>>,
+struct SeatData {
+    sink: EventsSink,
     store: Arc<Mutex<WindowStore>>,
-    kbd_sender: ::calloop::channel::Sender<crate::event::Event<()>>,
     pointer: Option<wl_pointer::WlPointer>,
     relative_pointer: Option<ZwpRelativePointerV1>,
     relative_pointer_manager_proxy: Rc<RefCell<Option<ZwpRelativePointerManagerV1>>>,
@@ -812,7 +831,7 @@ struct SeatData<T> {
     cursor_manager: Arc<Mutex<CursorManager>>,
 }
 
-impl<T: 'static> SeatData<T> {
+impl SeatData {
     fn receive(&mut self, evt: wl_seat::Event, seat: wl_seat::WlSeat) {
         match evt {
             wl_seat::Event::Name { .. } => (),
@@ -858,7 +877,7 @@ impl<T: 'static> SeatData<T> {
                 if capabilities.contains(wl_seat::Capability::Keyboard) && self.keyboard.is_none() {
                     self.keyboard = Some(super::keyboard::init_keyboard(
                         &seat,
-                        self.kbd_sender.clone(),
+                        self.sink.clone(),
                         self.modifiers_tracker.clone(),
                     ))
                 }
@@ -892,7 +911,7 @@ impl<T: 'static> SeatData<T> {
     }
 }
 
-impl<T> Drop for SeatData<T> {
+impl Drop for SeatData {
     fn drop(&mut self) {
         if let Some(pointer) = self.pointer.take() {
             if pointer.as_ref().version() >= 3 {
@@ -926,7 +945,7 @@ pub struct VideoMode {
 
 impl VideoMode {
     #[inline]
-    pub fn size(&self) -> PhysicalSize {
+    pub fn size(&self) -> PhysicalSize<u32> {
         self.size.into()
     }
 
@@ -986,9 +1005,9 @@ impl fmt::Debug for MonitorHandle {
         struct MonitorHandle {
             name: Option<String>,
             native_identifier: u32,
-            size: PhysicalSize,
-            position: PhysicalPosition,
-            hidpi_factor: i32,
+            size: PhysicalSize<u32>,
+            position: PhysicalPosition<i32>,
+            scale_factor: i32,
         }
 
         let monitor_id_proxy = MonitorHandle {
@@ -996,7 +1015,7 @@ impl fmt::Debug for MonitorHandle {
             native_identifier: self.native_identifier(),
             size: self.size(),
             position: self.position(),
-            hidpi_factor: self.hidpi_factor(),
+            scale_factor: self.scale_factor(),
         };
 
         monitor_id_proxy.fmt(f)
@@ -1015,7 +1034,7 @@ impl MonitorHandle {
         self.mgr.with_info(&self.proxy, |id, _| id).unwrap_or(0)
     }
 
-    pub fn size(&self) -> PhysicalSize {
+    pub fn size(&self) -> PhysicalSize<u32> {
         match self.mgr.with_info(&self.proxy, |_, info| {
             info.modes
                 .iter()
@@ -1028,7 +1047,7 @@ impl MonitorHandle {
         .into()
     }
 
-    pub fn position(&self) -> PhysicalPosition {
+    pub fn position(&self) -> PhysicalPosition<i32> {
         self.mgr
             .with_info(&self.proxy, |_, info| info.location)
             .unwrap_or((0, 0))
@@ -1036,7 +1055,7 @@ impl MonitorHandle {
     }
 
     #[inline]
-    pub fn hidpi_factor(&self) -> i32 {
+    pub fn scale_factor(&self) -> i32 {
         self.mgr
             .with_info(&self.proxy, |_, info| info.scale_factor)
             .unwrap_or(1)

src/platform_impl/linux/wayland/keyboard.rs

@@ -1,6 +1,6 @@
 use std::sync::{Arc, Mutex};
 
-use super::{make_wid, DeviceId};
+use super::{event_loop::EventsSink, make_wid, DeviceId};
 use smithay_client_toolkit::{
     keyboard::{
         self, map_keyboard_auto_with_repeat, Event as KbEvent, KeyRepeatEvent, KeyRepeatKind,
@@ -9,12 +9,12 @@ use smithay_client_toolkit::{
 };
 
 use crate::event::{
-    DeviceEvent, ElementState, Event, KeyboardInput, ModifiersState, VirtualKeyCode, WindowEvent,
+    DeviceEvent, ElementState, KeyboardInput, ModifiersState, VirtualKeyCode, WindowEvent,
 };
 
 pub fn init_keyboard(
     seat: &wl_seat::WlSeat,
-    sink: ::calloop::channel::Sender<crate::event::Event<()>>,
+    sink: EventsSink,
     modifiers_tracker: Arc<Mutex<ModifiersState>>,
 ) -> wl_keyboard::WlKeyboard {
     // { variables to be captured by the closures
@@ -31,22 +31,12 @@ pub fn init_keyboard(
             match evt {
                 KbEvent::Enter { surface, .. } => {
                     let wid = make_wid(&surface);
-                    my_sink
-                        .send(Event::WindowEvent {
-                            window_id: mk_root_wid(wid),
-                            event: WindowEvent::Focused(true),
-                        })
-                        .unwrap();
+                    my_sink.send_window_event(WindowEvent::Focused(true), wid);
                     *target.lock().unwrap() = Some(wid);
                 }
                 KbEvent::Leave { surface, .. } => {
                     let wid = make_wid(&surface);
-                    my_sink
-                        .send(Event::WindowEvent {
-                            window_id: mk_root_wid(wid),
-                            event: WindowEvent::Focused(false),
-                        })
-                        .unwrap();
+                    my_sink.send_window_event(WindowEvent::Focused(false), wid);
                     *target.lock().unwrap() = None;
                 }
                 KbEvent::Key {
@@ -63,33 +53,29 @@ pub fn init_keyboard(
                             _ => unreachable!(),
                         };
                         let vkcode = key_to_vkey(rawkey, keysym);
-                        my_sink
-                            .send(Event::WindowEvent {
-                                window_id: mk_root_wid(wid),
-                                event: WindowEvent::KeyboardInput {
-                                    device_id: device_id(),
-                                    input: KeyboardInput {
-                                        state,
-                                        scancode: rawkey,
-                                        virtual_keycode: vkcode,
-                                        modifiers: modifiers_tracker.lock().unwrap().clone(),
-                                    },
-                                    is_synthetic: false,
+                        my_sink.send_window_event(
+                            #[allow(deprecated)]
+                            WindowEvent::KeyboardInput {
+                                device_id: crate::event::DeviceId(
+                                    crate::platform_impl::DeviceId::Wayland(DeviceId),
+                                ),
+                                input: KeyboardInput {
+                                    state,
+                                    scancode: rawkey,
+                                    virtual_keycode: vkcode,
+                                    modifiers: modifiers_tracker.lock().unwrap().clone(),
                                 },
-                            })
-                            .unwrap();
+                                is_synthetic: false,
+                            },
+                            wid,
+                        );
                         // send char event only on key press, not release
                         if let ElementState::Released = state {
                             return;
                         }
                         if let Some(txt) = utf8 {
                             for chr in txt.chars() {
-                                my_sink
-                                    .send(Event::WindowEvent {
-                                        window_id: mk_root_wid(wid),
-                                        event: WindowEvent::ReceivedCharacter(chr),
-                                    })
-                                    .unwrap();
+                                my_sink.send_window_event(WindowEvent::ReceivedCharacter(chr), wid);
                             }
                         }
                     }
@@ -102,12 +88,7 @@ pub fn init_keyboard(
 
                     *modifiers_tracker.lock().unwrap() = modifiers;
 
-                    my_sink
-                        .send(Event::DeviceEvent {
-                            device_id: device_id(),
-                            event: DeviceEvent::ModifiersChanged(modifiers),
-                        })
-                        .unwrap();
+                    my_sink.send_device_event(DeviceEvent::ModifiersChanged(modifiers), DeviceId);
                 }
             }
         },
@@ -115,29 +96,25 @@ pub fn init_keyboard(
             if let Some(wid) = *repeat_target.lock().unwrap() {
                 let state = ElementState::Pressed;
                 let vkcode = key_to_vkey(repeat_event.rawkey, repeat_event.keysym);
-                repeat_sink
-                    .send(Event::WindowEvent {
-                        window_id: mk_root_wid(wid),
-                        event: WindowEvent::KeyboardInput {
-                            device_id: device_id(),
-                            input: KeyboardInput {
-                                state,
-                                scancode: repeat_event.rawkey,
-                                virtual_keycode: vkcode,
-                                modifiers: my_modifiers.lock().unwrap().clone(),
-                            },
-                            is_synthetic: false,
+                repeat_sink.send_window_event(
+                    #[allow(deprecated)]
+                    WindowEvent::KeyboardInput {
+                        device_id: crate::event::DeviceId(crate::platform_impl::DeviceId::Wayland(
+                            DeviceId,
+                        )),
+                        input: KeyboardInput {
+                            state,
+                            scancode: repeat_event.rawkey,
+                            virtual_keycode: vkcode,
+                            modifiers: my_modifiers.lock().unwrap().clone(),
                         },
-                    })
-                    .unwrap();
+                        is_synthetic: false,
+                    },
+                    wid,
+                );
                 if let Some(txt) = repeat_event.utf8 {
                     for chr in txt.chars() {
-                        repeat_sink
-                            .send(Event::WindowEvent {
-                                window_id: mk_root_wid(wid),
-                                event: WindowEvent::ReceivedCharacter(chr),
-                            })
-                            .unwrap();
+                        repeat_sink.send_window_event(WindowEvent::ReceivedCharacter(chr), wid);
                     }
                 }
             }
@@ -164,22 +141,12 @@ pub fn init_keyboard(
                     move |evt, _| match evt {
                         wl_keyboard::Event::Enter { surface, .. } => {
                             let wid = make_wid(&surface);
-                            my_sink
-                                .send(Event::WindowEvent {
-                                    window_id: mk_root_wid(wid),
-                                    event: WindowEvent::Focused(true),
-                                })
-                                .unwrap();
+                            my_sink.send_window_event(WindowEvent::Focused(true), wid);
                             target = Some(wid);
                         }
                         wl_keyboard::Event::Leave { surface, .. } => {
                             let wid = make_wid(&surface);
-                            my_sink
-                                .send(Event::WindowEvent {
-                                    window_id: mk_root_wid(wid),
-                                    event: WindowEvent::Focused(false),
-                                })
-                                .unwrap();
+                            my_sink.send_window_event(WindowEvent::Focused(false), wid);
                             target = None;
                         }
                         wl_keyboard::Event::Key { key, state, .. } => {
@@ -189,21 +156,22 @@ pub fn init_keyboard(
                                     wl_keyboard::KeyState::Released => ElementState::Released,
                                     _ => unreachable!(),
                                 };
-                                my_sink
-                                    .send(Event::WindowEvent {
-                                        window_id: mk_root_wid(wid),
-                                        event: WindowEvent::KeyboardInput {
-                                            device_id: device_id(),
-                                            input: KeyboardInput {
-                                                state,
-                                                scancode: key,
-                                                virtual_keycode: None,
-                                                modifiers: ModifiersState::default(),
-                                            },
-                                            is_synthetic: false,
+                                my_sink.send_window_event(
+                                    #[allow(deprecated)]
+                                    WindowEvent::KeyboardInput {
+                                        device_id: crate::event::DeviceId(
+                                            crate::platform_impl::DeviceId::Wayland(DeviceId),
+                                        ),
+                                        input: KeyboardInput {
+                                            state,
+                                            scancode: key,
+                                            virtual_keycode: None,
+                                            modifiers: ModifiersState::default(),
                                         },
-                                    })
-                                    .unwrap();
+                                        is_synthetic: false,
+                                    },
+                                    wid,
+                                );
                             }
                         }
                         _ => (),
@@ -412,11 +380,3 @@ impl ModifiersState {
         m
     }
 }
-
-fn device_id() -> crate::event::DeviceId {
-    crate::event::DeviceId(crate::platform_impl::DeviceId::Wayland(DeviceId))
-}
-
-fn mk_root_wid(wid: crate::platform_impl::wayland::WindowId) -> crate::window::WindowId {
-    crate::window::WindowId(crate::platform_impl::WindowId::Wayland(wid))
-}

src/platform_impl/linux/wayland/mod.rs

@@ -2,10 +2,7 @@
            target_os = "netbsd", target_os = "openbsd"))]
 
 pub use self::{
-    event_loop::{
-        EventLoop, EventLoopProxy, EventLoopWindowTarget, MonitorHandle, VideoMode,
-        WindowEventsSink,
-    },
+    event_loop::{EventLoop, EventLoopProxy, EventLoopWindowTarget, MonitorHandle, VideoMode},
     window::Window,
 };
 

src/platform_impl/linux/wayland/pointer.rs

@@ -6,7 +6,7 @@ use crate::event::{
 };
 
 use super::{
-    event_loop::{CursorManager, WindowEventsSink},
+    event_loop::{CursorManager, EventsSink},
     window::WindowStore,
     DeviceId,
 };
@@ -28,9 +28,9 @@ use smithay_client_toolkit::reexports::protocols::unstable::pointer_constraints:
 
 use smithay_client_toolkit::reexports::client::protocol::wl_surface::WlSurface;
 
-pub fn implement_pointer<T: 'static>(
+pub fn implement_pointer(
     seat: &wl_seat::WlSeat,
-    sink: Arc<Mutex<WindowEventsSink<T>>>,
+    sink: EventsSink,
     store: Arc<Mutex<WindowStore>>,
     modifiers_tracker: Arc<Mutex<ModifiersState>>,
     cursor_manager: Arc<Mutex<CursorManager>>,
@@ -43,7 +43,6 @@ pub fn implement_pointer<T: 'static>(
 
         pointer.implement_closure(
             move |evt, pointer| {
-                let mut sink = sink.lock().unwrap();
                 let store = store.lock().unwrap();
                 let mut cursor_manager = cursor_manager.lock().unwrap();
                 match evt {
@@ -242,20 +241,18 @@ pub fn implement_pointer<T: 'static>(
     .unwrap()
 }
 
-pub fn implement_relative_pointer<T: 'static>(
-    sink: Arc<Mutex<WindowEventsSink<T>>>,
+pub fn implement_relative_pointer(
+    sink: EventsSink,
     pointer: &WlPointer,
     manager: &ZwpRelativePointerManagerV1,
 ) -> Result<ZwpRelativePointerV1, ()> {
     manager.get_relative_pointer(pointer, |rel_pointer| {
         rel_pointer.implement_closure(
-            move |evt, _rel_pointer| {
-                let mut sink = sink.lock().unwrap();
-                match evt {
-                    Event::RelativeMotion { dx, dy, .. } => sink
-                        .send_device_event(DeviceEvent::MouseMotion { delta: (dx, dy) }, DeviceId),
-                    _ => unreachable!(),
+            move |evt, _rel_pointer| match evt {
+                Event::RelativeMotion { dx, dy, .. } => {
+                    sink.send_device_event(DeviceEvent::MouseMotion { delta: (dx, dy) }, DeviceId)
                 }
+                _ => unreachable!(),
             },
             (),
         )

src/platform_impl/linux/wayland/touch.rs

@@ -2,7 +2,7 @@ use std::sync::{Arc, Mutex};
 
 use crate::event::{TouchPhase, WindowEvent};
 
-use super::{event_loop::WindowEventsSink, window::WindowStore, DeviceId, WindowId};
+use super::{event_loop::EventsSink, window::WindowStore, DeviceId, WindowId};
 
 use smithay_client_toolkit::reexports::client::protocol::{
     wl_seat,
@@ -15,16 +15,15 @@ struct TouchPoint {
     id: i32,
 }
 
-pub(crate) fn implement_touch<T: 'static>(
+pub(crate) fn implement_touch(
     seat: &wl_seat::WlSeat,
-    sink: Arc<Mutex<WindowEventsSink<T>>>,
+    sink: EventsSink,
     store: Arc<Mutex<WindowStore>>,
 ) -> WlTouch {
     let mut pending_ids = Vec::new();
     seat.get_touch(|touch| {
         touch.implement_closure(
             move |evt, _| {
-                let mut sink = sink.lock().unwrap();
                 let store = store.lock().unwrap();
                 match evt {
                     TouchEvent::Down {

src/platform_impl/linux/wayland/window.rs

@@ -6,7 +6,7 @@ use std::{
 };
 
 use crate::{
-    dpi::{LogicalPosition, LogicalSize},
+    dpi::{LogicalSize, PhysicalPosition, PhysicalSize, Position, Size},
     error::{ExternalError, NotSupportedError, OsError as RootOsError},
     monitor::MonitorHandle as RootMonitorHandle,
     platform_impl::{
@@ -49,11 +49,7 @@ impl Window {
         attributes: WindowAttributes,
         pl_attribs: PlAttributes,
     ) -> Result<Window, RootOsError> {
-        let (width, height) = attributes.inner_size.map(Into::into).unwrap_or((800, 600));
-        // Create the window
-        let size = Arc::new(Mutex::new((width, height)));
-        let fullscreen = Arc::new(Mutex::new(false));
-
+        // Create the surface first to get initial DPI
         let window_store = evlp.store.clone();
         let cursor_manager = evlp.cursor_manager.clone();
         let surface = evlp.env.create_surface(move |dpi, surface| {
@@ -61,7 +57,18 @@ impl Window {
             surface.set_buffer_scale(dpi);
         });
 
+        let dpi = get_dpi_factor(&surface) as f64;
+        let (width, height) = attributes
+            .inner_size
+            .map(|size| size.to_logical::<f64>(dpi).into())
+            .unwrap_or((800, 600));
+
+        // Create the window
+        let size = Arc::new(Mutex::new((width, height)));
+        let fullscreen = Arc::new(Mutex::new(false));
+
         let window_store = evlp.store.clone();
+
         let my_surface = surface.clone();
         let mut frame = SWindow::<ConceptFrame>::init_from_env(
             &evlp.env,
@@ -137,8 +144,16 @@ impl Window {
         frame.set_title(attributes.title);
 
         // min-max dimensions
-        frame.set_min_size(attributes.min_inner_size.map(Into::into));
-        frame.set_max_size(attributes.max_inner_size.map(Into::into));
+        frame.set_min_size(
+            attributes
+                .min_inner_size
+                .map(|size| size.to_logical::<f64>(dpi).into()),
+        );
+        frame.set_max_size(
+            attributes
+                .max_inner_size
+                .map(|size| size.to_logical::<f64>(dpi).into()),
+        );
 
         let kill_switch = Arc::new(Mutex::new(false));
         let need_frame_refresh = Arc::new(Mutex::new(true));
@@ -191,22 +206,24 @@ impl Window {
     }
 
     #[inline]
-    pub fn outer_position(&self) -> Result<LogicalPosition, NotSupportedError> {
+    pub fn outer_position(&self) -> Result<PhysicalPosition<i32>, NotSupportedError> {
         Err(NotSupportedError::new())
     }
 
     #[inline]
-    pub fn inner_position(&self) -> Result<LogicalPosition, NotSupportedError> {
+    pub fn inner_position(&self) -> Result<PhysicalPosition<i32>, NotSupportedError> {
         Err(NotSupportedError::new())
     }
 
     #[inline]
-    pub fn set_outer_position(&self, _pos: LogicalPosition) {
+    pub fn set_outer_position(&self, _pos: Position) {
         // Not possible with wayland
     }
 
-    pub fn inner_size(&self) -> LogicalSize {
-        self.size.lock().unwrap().clone().into()
+    pub fn inner_size(&self) -> PhysicalSize<u32> {
+        let dpi = self.scale_factor() as f64;
+        let size = LogicalSize::<f64>::from(*self.size.lock().unwrap());
+        size.to_physical(dpi)
     }
 
     pub fn request_redraw(&self) {
@@ -214,34 +231,39 @@ impl Window {
     }
 
     #[inline]
-    pub fn outer_size(&self) -> LogicalSize {
+    pub fn outer_size(&self) -> PhysicalSize<u32> {
+        let dpi = self.scale_factor() as f64;
         let (w, h) = self.size.lock().unwrap().clone();
         // let (w, h) = super::wayland_window::add_borders(w as i32, h as i32);
-        (w, h).into()
+        let size = LogicalSize::<f64>::from((w, h));
+        size.to_physical(dpi)
     }
 
     #[inline]
     // NOTE: This will only resize the borders, the contents must be updated by the user
-    pub fn set_inner_size(&self, size: LogicalSize) {
-        let (w, h) = size.into();
+    pub fn set_inner_size(&self, size: Size) {
+        let dpi = self.scale_factor() as f64;
+        let (w, h) = size.to_logical::<u32>(dpi).into();
         self.frame.lock().unwrap().resize(w, h);
         *(self.size.lock().unwrap()) = (w, h);
     }
 
     #[inline]
-    pub fn set_min_inner_size(&self, dimensions: Option<LogicalSize>) {
+    pub fn set_min_inner_size(&self, dimensions: Option<Size>) {
+        let dpi = self.scale_factor() as f64;
         self.frame
             .lock()
             .unwrap()
-            .set_min_size(dimensions.map(Into::into));
+            .set_min_size(dimensions.map(|dim| dim.to_logical::<f64>(dpi).into()));
     }
 
     #[inline]
-    pub fn set_max_inner_size(&self, dimensions: Option<LogicalSize>) {
+    pub fn set_max_inner_size(&self, dimensions: Option<Size>) {
+        let dpi = self.scale_factor() as f64;
         self.frame
             .lock()
             .unwrap()
-            .set_max_size(dimensions.map(Into::into));
+            .set_max_size(dimensions.map(|dim| dim.to_logical::<f64>(dpi).into()));
     }
 
     #[inline]
@@ -250,7 +272,7 @@ impl Window {
     }
 
     #[inline]
-    pub fn hidpi_factor(&self) -> i32 {
+    pub fn scale_factor(&self) -> i32 {
         get_dpi_factor(&self.surface)
     }
 
@@ -325,7 +347,7 @@ impl Window {
     }
 
     #[inline]
-    pub fn set_cursor_position(&self, _pos: LogicalPosition) -> Result<(), ExternalError> {
+    pub fn set_cursor_position(&self, _pos: Position) -> Result<(), ExternalError> {
         Err(ExternalError::NotSupported(NotSupportedError::new()))
     }
 
@@ -375,6 +397,7 @@ impl Drop for Window {
 
 struct InternalWindow {
     surface: wl_surface::WlSurface,
+    // TODO: CONVERT TO LogicalSize<u32>s
     newsize: Option<(u32, u32)>,
     size: Arc<Mutex<(u32, u32)>>,
     need_refresh: Arc<Mutex<bool>>,
@@ -395,6 +418,7 @@ pub struct WindowStore {
 pub struct WindowStoreForEach<'a> {
     pub newsize: Option<(u32, u32)>,
     pub size: &'a mut (u32, u32),
+    pub prev_dpi: i32,
     pub new_dpi: Option<i32>,
     pub closed: bool,
     pub grab_cursor: Option<bool>,
@@ -460,6 +484,7 @@ impl WindowStore {
             f(WindowStoreForEach {
                 newsize: window.newsize.take(),
                 size: &mut *(window.size.lock().unwrap()),
+                prev_dpi: window.current_dpi,
                 new_dpi: window.new_dpi,
                 closed: window.closed,
                 grab_cursor: window.cursor_grab_changed.lock().unwrap().take(),

src/platform_impl/linux/x11/event_processor.rs

@@ -1,4 +1,4 @@
-use std::{cell::RefCell, collections::HashMap, rc::Rc, slice};
+use std::{cell::RefCell, collections::HashMap, rc::Rc, slice, sync::Arc};
 
 use libc::{c_char, c_int, c_long, c_uint, c_ulong};
 
@@ -11,7 +11,7 @@ use super::{
 use util::modifiers::{ModifierKeyState, ModifierKeymap};
 
 use crate::{
-    dpi::{LogicalPosition, LogicalSize},
+    dpi::{PhysicalPosition, PhysicalSize},
     event::{
         DeviceEvent, ElementState, Event, KeyboardInput, ModifiersState, TouchPhase, WindowEvent,
     },
@@ -45,7 +45,7 @@ impl<T: 'static> EventProcessor<T> {
 
     fn with_window<F, Ret>(&self, window_id: ffi::Window, callback: F) -> Option<Ret>
     where
-        F: Fn(&UnownedWindow) -> Ret,
+        F: Fn(&Arc<UnownedWindow>) -> Ret,
     {
         let mut deleted = false;
         let window_id = WindowId(window_id);
@@ -59,7 +59,7 @@ impl<T: 'static> EventProcessor<T> {
                 deleted = arc.is_none();
                 arc
             })
-            .map(|window| callback(&*window));
+            .map(|window| callback(&window));
         if deleted {
             // Garbage collection
             wt.windows.borrow_mut().remove(&window_id);
@@ -107,7 +107,7 @@ impl<T: 'static> EventProcessor<T> {
 
     pub(super) fn process_event<F>(&mut self, xev: &mut ffi::XEvent, mut callback: F)
     where
-        F: FnMut(Event<T>),
+        F: FnMut(Event<'_, T>),
     {
         let wt = get_xtarget(&self.target);
         // XFilterEvent tells us when an event has been discarded by the input method.
@@ -321,16 +321,11 @@ impl<T: 'static> EventProcessor<T> {
             }
 
             ffi::ConfigureNotify => {
-                #[derive(Debug, Default)]
-                struct Events {
-                    resized: Option<WindowEvent>,
-                    moved: Option<WindowEvent>,
-                    dpi_changed: Option<WindowEvent>,
-                }
-
                 let xev: &ffi::XConfigureEvent = xev.as_ref();
                 let xwindow = xev.window;
-                let events = self.with_window(xwindow, |window| {
+                let window_id = mkwid(xwindow);
+
+                if let Some(window) = self.with_window(xwindow, Arc::clone) {
                     // So apparently...
                     // `XSendEvent` (synthetic `ConfigureNotify`) -> position relative to root
                     // `XConfigureNotify` (real `ConfigureNotify`) -> position relative to parent
@@ -344,7 +339,6 @@ impl<T: 'static> EventProcessor<T> {
                     let new_inner_size = (xev.width as u32, xev.height as u32);
                     let new_inner_position = (xev.x as i32, xev.y as i32);
 
-                    let mut monitor = window.current_monitor(); // This must be done *before* locking!
                     let mut shared_state_lock = window.shared_state.lock();
 
                     let (mut resized, moved) = {
@@ -374,8 +368,6 @@ impl<T: 'static> EventProcessor<T> {
                         (resized, moved)
                     };
 
-                    let mut events = Events::default();
-
                     let new_outer_position = if moved || shared_state_lock.position.is_none() {
                         // We need to convert client area position to window position.
                         let frame_extents = shared_state_lock
@@ -392,9 +384,10 @@ impl<T: 'static> EventProcessor<T> {
                             .inner_pos_to_outer(new_inner_position.0, new_inner_position.1);
                         shared_state_lock.position = Some(outer);
                         if moved {
-                            let logical_position =
-                                LogicalPosition::from_physical(outer, monitor.hidpi_factor);
-                            events.moved = Some(WindowEvent::Moved(logical_position));
+                            callback(Event::WindowEvent {
+                                window_id,
+                                event: WindowEvent::Moved(outer.into()),
+                            });
                         }
                         outer
                     } else {
@@ -406,36 +399,51 @@ impl<T: 'static> EventProcessor<T> {
                         // resizing by dragging across monitors *without* dropping the window.
                         let (width, height) = shared_state_lock
                             .dpi_adjusted
-                            .unwrap_or_else(|| (xev.width as f64, xev.height as f64));
+                            .unwrap_or_else(|| (xev.width as u32, xev.height as u32));
 
-                        let last_hidpi_factor = shared_state_lock.last_monitor.hidpi_factor;
-                        let new_hidpi_factor = {
+                        let last_scale_factor = shared_state_lock.last_monitor.scale_factor;
+                        let new_scale_factor = {
                             let window_rect = util::AaRect::new(new_outer_position, new_inner_size);
-                            let new_monitor = wt.xconn.get_monitor_for_window(Some(window_rect));
+                            let monitor = wt.xconn.get_monitor_for_window(Some(window_rect));
 
-                            if new_monitor.is_dummy() {
+                            if monitor.is_dummy() {
                                 // Avoid updating monitor using a dummy monitor handle
-                                last_hidpi_factor
+                                last_scale_factor
                             } else {
-                                monitor = new_monitor;
                                 shared_state_lock.last_monitor = monitor.clone();
-                                monitor.hidpi_factor
+                                monitor.scale_factor
                             }
                         };
-                        if last_hidpi_factor != new_hidpi_factor {
-                            events.dpi_changed =
-                                Some(WindowEvent::HiDpiFactorChanged(new_hidpi_factor));
-                            let (new_width, new_height, flusher) = window.adjust_for_dpi(
-                                last_hidpi_factor,
-                                new_hidpi_factor,
+                        if last_scale_factor != new_scale_factor {
+                            let (new_width, new_height) = window.adjust_for_dpi(
+                                last_scale_factor,
+                                new_scale_factor,
                                 width,
                                 height,
+                                &shared_state_lock,
                             );
-                            flusher.queue();
-                            shared_state_lock.dpi_adjusted = Some((new_width, new_height));
-                            // if the DPI factor changed, force a resize event to ensure the logical
-                            // size is computed with the right DPI factor
-                            resized = true;
+
+                            let old_inner_size = PhysicalSize::new(width, height);
+                            let mut new_inner_size = PhysicalSize::new(new_width, new_height);
+
+                            callback(Event::WindowEvent {
+                                window_id,
+                                event: WindowEvent::ScaleFactorChanged {
+                                    scale_factor: new_scale_factor,
+                                    new_inner_size: &mut new_inner_size,
+                                },
+                            });
+
+                            if new_inner_size != old_inner_size {
+                                window.set_inner_size_physical(
+                                    new_inner_size.width,
+                                    new_inner_size.height,
+                                );
+                                shared_state_lock.dpi_adjusted = Some(new_inner_size.into());
+                                // if the DPI factor changed, force a resize event to ensure the logical
+                                // size is computed with the right DPI factor
+                                resized = true;
+                            }
                         }
                     }
 
@@ -444,44 +452,19 @@ impl<T: 'static> EventProcessor<T> {
                     // WMs constrain the window size, making the resize fail. This would cause an endless stream of
                     // XResizeWindow requests, making Xorg, the winit client, and the WM consume 100% of CPU.
                     if let Some(adjusted_size) = shared_state_lock.dpi_adjusted {
-                        let rounded_size = (
-                            adjusted_size.0.round() as u32,
-                            adjusted_size.1.round() as u32,
-                        );
-                        if new_inner_size == rounded_size || !util::wm_name_is_one_of(&["Xfwm4"]) {
+                        if new_inner_size == adjusted_size || !util::wm_name_is_one_of(&["Xfwm4"]) {
                             // When this finally happens, the event will not be synthetic.
                             shared_state_lock.dpi_adjusted = None;
                         } else {
-                            unsafe {
-                                (wt.xconn.xlib.XResizeWindow)(
-                                    wt.xconn.display,
-                                    xwindow,
-                                    rounded_size.0 as c_uint,
-                                    rounded_size.1 as c_uint,
-                                );
-                            }
+                            window.set_inner_size_physical(adjusted_size.0, adjusted_size.1);
                         }
                     }
 
                     if resized {
-                        let logical_size =
-                            LogicalSize::from_physical(new_inner_size, monitor.hidpi_factor);
-                        events.resized = Some(WindowEvent::Resized(logical_size));
-                    }
-
-                    events
-                });
-
-                if let Some(events) = events {
-                    let window_id = mkwid(xwindow);
-                    if let Some(event) = events.dpi_changed {
-                        callback(Event::WindowEvent { window_id, event });
-                    }
-                    if let Some(event) = events.resized {
-                        callback(Event::WindowEvent { window_id, event });
-                    }
-                    if let Some(event) = events.moved {
-                        callback(Event::WindowEvent { window_id, event });
+                        callback(Event::WindowEvent {
+                            window_id,
+                            event: WindowEvent::Resized(new_inner_size.into()),
+                        });
                     }
                 }
             }
@@ -579,6 +562,7 @@ impl<T: 'static> EventProcessor<T> {
 
                     let modifiers = self.device_mod_state.modifiers();
 
+                    #[allow(deprecated)]
                     callback(Event::WindowEvent {
                         window_id,
                         event: WindowEvent::KeyboardInput {
@@ -728,24 +712,17 @@ impl<T: 'static> EventProcessor<T> {
                             util::maybe_change(&mut shared_state_lock.cursor_pos, new_cursor_pos)
                         });
                         if cursor_moved == Some(true) {
-                            let dpi_factor =
-                                self.with_window(xev.event, |window| window.hidpi_factor());
-                            if let Some(dpi_factor) = dpi_factor {
-                                let position = LogicalPosition::from_physical(
-                                    (xev.event_x as f64, xev.event_y as f64),
-                                    dpi_factor,
-                                );
-                                callback(Event::WindowEvent {
-                                    window_id,
-                                    event: CursorMoved {
-                                        device_id,
-                                        position,
-                                        modifiers,
-                                    },
-                                });
-                            } else {
-                                return;
-                            }
+                            let position =
+                                PhysicalPosition::new(xev.event_x as i32, xev.event_y as i32);
+
+                            callback(Event::WindowEvent {
+                                window_id,
+                                event: CursorMoved {
+                                    device_id,
+                                    position,
+                                    modifiers,
+                                },
+                            });
                         } else if cursor_moved.is_none() {
                             return;
                         }
@@ -836,18 +813,14 @@ impl<T: 'static> EventProcessor<T> {
                             }
                         }
 
-                        if let Some(dpi_factor) =
-                            self.with_window(xev.event, |window| window.hidpi_factor())
-                        {
+                        if self.window_exists(xev.event) {
                             callback(Event::WindowEvent {
                                 window_id,
                                 event: CursorEntered { device_id },
                             });
 
-                            let position = LogicalPosition::from_physical(
-                                (xev.event_x as f64, xev.event_y as f64),
-                                dpi_factor,
-                            );
+                            let position =
+                                PhysicalPosition::new(xev.event_x as i32, xev.event_y as i32);
 
                             // The mods field on this event isn't actually populated, so query the
                             // pointer device. In the future, we can likely remove this round-trip by
@@ -890,11 +863,6 @@ impl<T: 'static> EventProcessor<T> {
                     ffi::XI_FocusIn => {
                         let xev: &ffi::XIFocusInEvent = unsafe { &*(xev.data as *const _) };
 
-                        let dpi_factor =
-                            match self.with_window(xev.event, |window| window.hidpi_factor()) {
-                                Some(dpi_factor) => dpi_factor,
-                                None => return,
-                            };
                         let window_id = mkwid(xev.event);
 
                         wt.ime
@@ -920,10 +888,9 @@ impl<T: 'static> EventProcessor<T> {
                             .map(|device| device.attachment)
                             .unwrap_or(2);
 
-                        let position = LogicalPosition::from_physical(
-                            (xev.event_x as f64, xev.event_y as f64),
-                            dpi_factor,
-                        );
+                        let position =
+                            PhysicalPosition::new(xev.event_x as i32, xev.event_y as i32);
+
                         callback(Event::WindowEvent {
                             window_id,
                             event: CursorMoved {
@@ -966,15 +933,11 @@ impl<T: 'static> EventProcessor<T> {
                             ffi::XI_TouchEnd => TouchPhase::Ended,
                             _ => unreachable!(),
                         };
-                        let dpi_factor =
-                            self.with_window(xev.event, |window| window.hidpi_factor());
-                        if let Some(dpi_factor) = dpi_factor {
+                        if self.window_exists(xev.event) {
                             let id = xev.detail as u64;
                             let modifiers = self.device_mod_state.modifiers();
-                            let location = LogicalPosition::from_physical(
-                                (xev.event_x as f64, xev.event_y as f64),
-                                dpi_factor,
-                            );
+                            let location =
+                                PhysicalPosition::new(xev.event_x as f64, xev.event_y as f64);
 
                             // Mouse cursor position changes when touch events are received.
                             // Only the first concurrently active touch ID moves the mouse cursor.
@@ -984,7 +947,7 @@ impl<T: 'static> EventProcessor<T> {
                                     window_id,
                                     event: WindowEvent::CursorMoved {
                                         device_id: mkdid(util::VIRTUAL_CORE_POINTER),
-                                        position: location,
+                                        position: location.cast(),
                                         modifiers,
                                     },
                                 });
@@ -1090,6 +1053,7 @@ impl<T: 'static> EventProcessor<T> {
                         let virtual_keycode = events::keysym_to_element(keysym as c_uint);
                         let modifiers = self.device_mod_state.modifiers();
 
+                        #[allow(deprecated)]
                         callback(Event::DeviceEvent {
                             device_id,
                             event: DeviceEvent::Key(KeyboardInput {
@@ -1157,27 +1121,48 @@ impl<T: 'static> EventProcessor<T> {
                                 .iter()
                                 .find(|prev_monitor| prev_monitor.name == new_monitor.name)
                                 .map(|prev_monitor| {
-                                    if new_monitor.hidpi_factor != prev_monitor.hidpi_factor {
+                                    if new_monitor.scale_factor != prev_monitor.scale_factor {
                                         for (window_id, window) in wt.windows.borrow().iter() {
                                             if let Some(window) = window.upgrade() {
                                                 // Check if the window is on this monitor
                                                 let monitor = window.current_monitor();
                                                 if monitor.name == new_monitor.name {
-                                                    callback(Event::WindowEvent {
-                                                        window_id: mkwid(window_id.0),
-                                                        event: WindowEvent::HiDpiFactorChanged(
-                                                            new_monitor.hidpi_factor,
-                                                        ),
-                                                    });
                                                     let (width, height) =
                                                         window.inner_size_physical();
-                                                    let (_, _, flusher) = window.adjust_for_dpi(
-                                                        prev_monitor.hidpi_factor,
-                                                        new_monitor.hidpi_factor,
-                                                        width as f64,
-                                                        height as f64,
+                                                    let (new_width, new_height) = window
+                                                        .adjust_for_dpi(
+                                                            prev_monitor.scale_factor,
+                                                            new_monitor.scale_factor,
+                                                            width,
+                                                            height,
+                                                            &*window.shared_state.lock(),
+                                                        );
+
+                                                    let window_id = crate::window::WindowId(
+                                                        crate::platform_impl::platform::WindowId::X(
+                                                            *window_id,
+                                                        ),
                                                     );
-                                                    flusher.queue();
+                                                    let old_inner_size =
+                                                        PhysicalSize::new(width, height);
+                                                    let mut new_inner_size =
+                                                        PhysicalSize::new(new_width, new_height);
+
+                                                    callback(Event::WindowEvent {
+                                                        window_id,
+                                                        event: WindowEvent::ScaleFactorChanged {
+                                                            scale_factor: new_monitor.scale_factor,
+                                                            new_inner_size: &mut new_inner_size,
+                                                        },
+                                                    });
+
+                                                    if new_inner_size != old_inner_size {
+                                                        let (new_width, new_height) =
+                                                            new_inner_size.into();
+                                                        window.set_inner_size_physical(
+                                                            new_width, new_height,
+                                                        );
+                                                    }
                                                 }
                                             }
                                         }
@@ -1203,7 +1188,7 @@ impl<T: 'static> EventProcessor<T> {
         state: ElementState,
         callback: &mut F,
     ) where
-        F: FnMut(Event<T>),
+        F: FnMut(Event<'_, T>),
     {
         let wt = get_xtarget(&self.target);
 
@@ -1222,6 +1207,7 @@ impl<T: 'static> EventProcessor<T> {
             let keysym = wt.xconn.keycode_to_keysym(keycode);
             let virtual_keycode = events::keysym_to_element(keysym as c_uint);
 
+            #[allow(deprecated)]
             callback(Event::WindowEvent {
                 window_id,
                 event: WindowEvent::KeyboardInput {

src/platform_impl/linux/x11/mod.rs

@@ -24,7 +24,7 @@ pub use self::{
 
 use std::{
     cell::RefCell,
-    collections::{HashMap, HashSet, VecDeque},
+    collections::{HashMap, HashSet},
     ffi::CStr,
     mem::{self, MaybeUninit},
     ops::Deref,
@@ -37,6 +37,10 @@ use std::{
 
 use libc::{self, setlocale, LC_CTYPE};
 
+use mio::{unix::EventedFd, Events, Poll, PollOpt, Ready, Token};
+
+use mio_extras::channel::{channel, Receiver, SendError, Sender};
+
 use self::{
     dnd::{Dnd, DndState},
     event_processor::EventProcessor,
@@ -51,6 +55,9 @@ use crate::{
     window::WindowAttributes,
 };
 
+const X_TOKEN: Token = Token(0);
+const USER_TOKEN: Token = Token(1);
+
 pub struct EventLoopWindowTarget<T> {
     xconn: Arc<XConnection>,
     wm_delete_window: ffi::Atom,
@@ -64,18 +71,15 @@ pub struct EventLoopWindowTarget<T> {
 }
 
 pub struct EventLoop<T: 'static> {
-    inner_loop: ::calloop::EventLoop<()>,
-    _x11_source: ::calloop::Source<::calloop::generic::Generic<::calloop::generic::EventedRawFd>>,
-    _user_source: ::calloop::Source<::calloop::channel::Channel<T>>,
-    pending_user_events: Rc<RefCell<VecDeque<T>>>,
-    event_processor: Rc<RefCell<EventProcessor<T>>>,
-    user_sender: ::calloop::channel::Sender<T>,
-    pending_events: Rc<RefCell<VecDeque<Event<T>>>>,
-    pub(crate) target: Rc<RootELW<T>>,
+    poll: Poll,
+    event_processor: EventProcessor<T>,
+    user_channel: Receiver<T>,
+    user_sender: Sender<T>,
+    target: Rc<RootELW<T>>,
 }
 
 pub struct EventLoopProxy<T: 'static> {
-    user_sender: ::calloop::channel::Sender<T>,
+    user_sender: Sender<T>,
 }
 
 impl<T: 'static> Clone for EventLoopProxy<T> {
@@ -171,28 +175,27 @@ impl<T: 'static> EventLoop<T> {
             _marker: ::std::marker::PhantomData,
         });
 
-        // A calloop event loop to drive us
-        let inner_loop = ::calloop::EventLoop::new().unwrap();
+        let poll = Poll::new().unwrap();
 
-        // Handle user events
-        let pending_user_events = Rc::new(RefCell::new(VecDeque::new()));
-        let pending_user_events2 = pending_user_events.clone();
+        let (user_sender, user_channel) = channel();
 
-        let (user_sender, user_channel) = ::calloop::channel::channel();
+        poll.register(
+            &EventedFd(&get_xtarget(&target).xconn.x11_fd),
+            X_TOKEN,
+            Ready::readable(),
+            PollOpt::level(),
+        )
+        .unwrap();
 
-        let _user_source = inner_loop
-            .handle()
-            .insert_source(user_channel, move |evt, &mut ()| {
-                if let ::calloop::channel::Event::Msg(msg) = evt {
-                    pending_user_events2.borrow_mut().push_back(msg);
-                }
-            })
-            .unwrap();
+        poll.register(
+            &user_channel,
+            USER_TOKEN,
+            Ready::readable(),
+            PollOpt::level(),
+        )
+        .unwrap();
 
-        // Handle X11 events
-        let pending_events: Rc<RefCell<VecDeque<_>>> = Default::default();
-
-        let processor = EventProcessor {
+        let event_processor = EventProcessor {
             target: target.clone(),
             dnd,
             devices: Default::default(),
@@ -212,38 +215,12 @@ impl<T: 'static> EventLoop<T> {
             .select_xinput_events(root, ffi::XIAllDevices, ffi::XI_HierarchyChangedMask)
             .queue();
 
-        processor.init_device(ffi::XIAllDevices);
-
-        let processor = Rc::new(RefCell::new(processor));
-        let event_processor = processor.clone();
-
-        // Setup the X11 event source
-        let mut x11_events =
-            ::calloop::generic::Generic::from_raw_fd(get_xtarget(&target).xconn.x11_fd);
-        x11_events.set_interest(::calloop::mio::Ready::readable());
-        let _x11_source = inner_loop
-            .handle()
-            .insert_source(x11_events, {
-                let pending_events = pending_events.clone();
-                move |evt, &mut ()| {
-                    if evt.readiness.is_readable() {
-                        let mut processor = processor.borrow_mut();
-                        let mut pending_events = pending_events.borrow_mut();
-                        let mut pending_redraws = pending_redraws.lock().unwrap();
-
-                        drain_events(&mut processor, &mut pending_events, &mut pending_redraws);
-                    }
-                }
-            })
-            .unwrap();
+        event_processor.init_device(ffi::XIAllDevices);
 
         let result = EventLoop {
-            inner_loop,
-            pending_events,
-            _x11_source,
-            _user_source,
+            poll,
+            user_channel,
             user_sender,
-            pending_user_events,
             event_processor,
             target,
         };
@@ -261,12 +238,16 @@ impl<T: 'static> EventLoop<T> {
         &self.target
     }
 
+    pub(crate) fn x_connection(&self) -> &Arc<XConnection> {
+        get_xtarget(&self.target).x_connection()
+    }
+
     pub fn run_return<F>(&mut self, mut callback: F)
     where
-        F: FnMut(Event<T>, &RootELW<T>, &mut ControlFlow),
+        F: FnMut(Event<'_, T>, &RootELW<T>, &mut ControlFlow),
     {
         let mut control_flow = ControlFlow::default();
-        let wt = get_xtarget(&self.target);
+        let mut events = Events::with_capacity(8);
 
         callback(
             crate::event::Event::NewEvents(crate::event::StartCause::Init),
@@ -275,22 +256,16 @@ impl<T: 'static> EventLoop<T> {
         );
 
         loop {
-            self.drain_events();
+            // Process all pending events
+            self.drain_events(&mut callback, &mut control_flow);
 
-            // Empty the event buffer
-            {
-                let mut guard = self.pending_events.borrow_mut();
-                for evt in guard.drain(..) {
-                    sticky_exit_callback(evt, &self.target, &mut control_flow, &mut callback);
-                }
-            }
+            let wt = get_xtarget(&self.target);
 
             // Empty the user event buffer
             {
-                let mut guard = self.pending_user_events.borrow_mut();
-                for evt in guard.drain(..) {
+                while let Ok(event) = self.user_channel.try_recv() {
                     sticky_exit_callback(
-                        crate::event::Event::UserEvent(evt),
+                        crate::event::Event::UserEvent(event),
                         &self.target,
                         &mut control_flow,
                         &mut callback,
@@ -331,7 +306,7 @@ impl<T: 'static> EventLoop<T> {
             }
 
             let start = Instant::now();
-            let (mut cause, deadline, mut timeout);
+            let (mut cause, deadline, timeout);
 
             match control_flow {
                 ControlFlow::Exit => break,
@@ -362,26 +337,39 @@ impl<T: 'static> EventLoop<T> {
                 }
             }
 
-            if self.events_waiting() {
-                timeout = Some(Duration::from_millis(0));
-            }
+            if self.event_processor.poll() {
+                // If the XConnection already contains buffered events, we don't
+                // need to wait for data on the socket.
+                // However, we still need to check for user events.
+                self.poll
+                    .poll(&mut events, Some(Duration::from_millis(0)))
+                    .unwrap();
+                events.clear();
 
-            self.inner_loop.dispatch(timeout, &mut ()).unwrap();
+                callback(
+                    crate::event::Event::NewEvents(cause),
+                    &self.target,
+                    &mut control_flow,
+                );
+            } else {
+                self.poll.poll(&mut events, timeout).unwrap();
+                events.clear();
 
-            if let Some(deadline) = deadline {
-                if deadline > Instant::now() {
+                let wait_cancelled = deadline.map_or(false, |deadline| Instant::now() < deadline);
+
+                if wait_cancelled {
                     cause = StartCause::WaitCancelled {
                         start,
-                        requested_resume: Some(deadline),
+                        requested_resume: deadline,
                     };
                 }
-            }
 
-            callback(
-                crate::event::Event::NewEvents(cause),
-                &self.target,
-                &mut control_flow,
-            );
+                callback(
+                    crate::event::Event::NewEvents(cause),
+                    &self.target,
+                    &mut control_flow,
+                );
+            }
         }
 
         callback(
@@ -393,44 +381,42 @@ impl<T: 'static> EventLoop<T> {
 
     pub fn run<F>(mut self, callback: F) -> !
     where
-        F: 'static + FnMut(Event<T>, &RootELW<T>, &mut ControlFlow),
+        F: 'static + FnMut(Event<'_, T>, &RootELW<T>, &mut ControlFlow),
     {
         self.run_return(callback);
         ::std::process::exit(0);
     }
 
-    fn drain_events(&self) {
-        let mut processor = self.event_processor.borrow_mut();
-        let mut pending_events = self.pending_events.borrow_mut();
+    fn drain_events<F>(&mut self, callback: &mut F, control_flow: &mut ControlFlow)
+    where
+        F: FnMut(Event<'_, T>, &RootELW<T>, &mut ControlFlow),
+    {
+        let target = &self.target;
+        let mut xev = MaybeUninit::uninit();
+
         let wt = get_xtarget(&self.target);
         let mut pending_redraws = wt.pending_redraws.lock().unwrap();
 
-        drain_events(&mut processor, &mut pending_events, &mut pending_redraws);
-    }
-
-    fn events_waiting(&self) -> bool {
-        !self.pending_events.borrow().is_empty() || self.event_processor.borrow().poll()
-    }
-}
-
-fn drain_events<T: 'static>(
-    processor: &mut EventProcessor<T>,
-    pending_events: &mut VecDeque<Event<T>>,
-    pending_redraws: &mut HashSet<WindowId>,
-) {
-    let mut callback = |event| {
-        if let Event::RedrawRequested(crate::window::WindowId(super::WindowId::X(wid))) = event {
-            pending_redraws.insert(wid);
-        } else {
-            pending_events.push_back(event);
+        while unsafe { self.event_processor.poll_one_event(xev.as_mut_ptr()) } {
+            let mut xev = unsafe { xev.assume_init() };
+            self.event_processor.process_event(&mut xev, |event| {
+                sticky_exit_callback(
+                    event,
+                    target,
+                    control_flow,
+                    &mut |event, window_target, control_flow| {
+                        if let Event::RedrawRequested(crate::window::WindowId(
+                            super::WindowId::X(wid),
+                        )) = event
+                        {
+                            pending_redraws.insert(wid);
+                        } else {
+                            callback(event, window_target, control_flow);
+                        }
+                    },
+                );
+            });
         }
-    };
-
-    // process all pending events
-    let mut xev = MaybeUninit::uninit();
-    while unsafe { processor.poll_one_event(xev.as_mut_ptr()) } {
-        let mut xev = unsafe { xev.assume_init() };
-        processor.process_event(&mut xev, &mut callback);
     }
 }
 
@@ -452,7 +438,7 @@ impl<T> EventLoopWindowTarget<T> {
 impl<T: 'static> EventLoopProxy<T> {
     pub fn send_event(&self, event: T) -> Result<(), EventLoopClosed<T>> {
         self.user_sender.send(event).map_err(|e| {
-            EventLoopClosed(if let ::calloop::channel::SendError::Disconnected(x) = e {
+            EventLoopClosed(if let SendError::Disconnected(x) = e {
                 x
             } else {
                 unreachable!()

src/platform_impl/linux/x11/monitor.rs

@@ -38,7 +38,7 @@ pub struct VideoMode {
 
 impl VideoMode {
     #[inline]
-    pub fn size(&self) -> PhysicalSize {
+    pub fn size(&self) -> PhysicalSize<u32> {
         self.size.into()
     }
 
@@ -73,7 +73,7 @@ pub struct MonitorHandle {
     /// If the monitor is the primary one
     primary: bool,
     /// The DPI scale factor
-    pub(crate) hidpi_factor: f64,
+    pub(crate) scale_factor: f64,
     /// Used to determine which windows are on this monitor
     pub(crate) rect: util::AaRect,
     /// Supported video modes on this monitor
@@ -114,14 +114,14 @@ impl MonitorHandle {
         crtc: *mut XRRCrtcInfo,
         primary: bool,
     ) -> Option<Self> {
-        let (name, hidpi_factor, video_modes) = unsafe { xconn.get_output_info(resources, crtc)? };
+        let (name, scale_factor, video_modes) = unsafe { xconn.get_output_info(resources, crtc)? };
         let dimensions = unsafe { ((*crtc).width as u32, (*crtc).height as u32) };
         let position = unsafe { ((*crtc).x as i32, (*crtc).y as i32) };
         let rect = util::AaRect::new(position, dimensions);
         Some(MonitorHandle {
             id,
             name,
-            hidpi_factor,
+            scale_factor,
             dimensions,
             position,
             primary,
@@ -134,7 +134,7 @@ impl MonitorHandle {
         MonitorHandle {
             id: 0,
             name: "<dummy monitor>".into(),
-            hidpi_factor: 1.0,
+            scale_factor: 1.0,
             dimensions: (1, 1),
             position: (0, 0),
             primary: true,
@@ -157,17 +157,17 @@ impl MonitorHandle {
         self.id as u32
     }
 
-    pub fn size(&self) -> PhysicalSize {
+    pub fn size(&self) -> PhysicalSize<u32> {
         self.dimensions.into()
     }
 
-    pub fn position(&self) -> PhysicalPosition {
+    pub fn position(&self) -> PhysicalPosition<i32> {
         self.position.into()
     }
 
     #[inline]
-    pub fn hidpi_factor(&self) -> f64 {
-        self.hidpi_factor
+    pub fn scale_factor(&self) -> f64 {
+        self.scale_factor
     }
 
     #[inline]

src/platform_impl/linux/x11/util/geometry.rs

@@ -137,9 +137,9 @@ impl FrameExtentsHeuristic {
 
     pub fn inner_pos_to_outer_logical(
         &self,
-        mut logical: LogicalPosition,
+        mut logical: LogicalPosition<f64>,
         factor: f64,
-    ) -> LogicalPosition {
+    ) -> LogicalPosition<f64> {
         use self::FrameExtentsHeuristicPath::*;
         if self.heuristic_path != UnsupportedBordered {
             let frame_extents = self.frame_extents.as_logical(factor);
@@ -166,9 +166,9 @@ impl FrameExtentsHeuristic {
 
     pub fn inner_size_to_outer_logical(
         &self,
-        mut logical: LogicalSize,
+        mut logical: LogicalSize<f64>,
         factor: f64,
-    ) -> LogicalSize {
+    ) -> LogicalSize<f64> {
         let frame_extents = self.frame_extents.as_logical(factor);
         logical.width += frame_extents.left + frame_extents.right;
         logical.height += frame_extents.top + frame_extents.bottom;

src/platform_impl/linux/x11/util/input.rs

@@ -18,9 +18,9 @@ impl ModifiersState {
 
     pub(crate) fn from_x11_mask(mask: c_uint) -> Self {
         let mut m = ModifiersState::empty();
-        m.set(ModifiersState::SHIFT, mask & ffi::Mod1Mask != 0);
-        m.set(ModifiersState::CTRL, mask & ffi::ShiftMask != 0);
-        m.set(ModifiersState::ALT, mask & ffi::ControlMask != 0);
+        m.set(ModifiersState::ALT, mask & ffi::Mod1Mask != 0);
+        m.set(ModifiersState::SHIFT, mask & ffi::ShiftMask != 0);
+        m.set(ModifiersState::CTRL, mask & ffi::ControlMask != 0);
         m.set(ModifiersState::LOGO, mask & ffi::Mod4Mask != 0);
         m
     }

src/platform_impl/linux/x11/util/randr.rs

@@ -4,7 +4,7 @@ use super::{
     ffi::{CurrentTime, RRCrtc, RRMode, Success, XRRCrtcInfo, XRRScreenResources},
     *,
 };
-use crate::{dpi::validate_hidpi_factor, platform_impl::platform::x11::VideoMode};
+use crate::{dpi::validate_scale_factor, platform_impl::platform::x11::VideoMode};
 
 /// Represents values of `WINIT_HIDPI_FACTOR`.
 pub enum EnvVarDPI {
@@ -26,7 +26,7 @@ pub fn calc_dpi_factor(
     let ppmm = ((width_px as f64 * height_px as f64) / (width_mm as f64 * height_mm as f64)).sqrt();
     // Quantize 1/12 step size
     let dpi_factor = ((ppmm * (12.0 * 25.4 / 96.0)).round() / 12.0).max(1.0);
-    assert!(validate_hidpi_factor(dpi_factor));
+    assert!(validate_scale_factor(dpi_factor));
     dpi_factor
 }
 
@@ -100,8 +100,14 @@ impl XConnection {
             (*output_info).nameLen as usize,
         );
         let name = String::from_utf8_lossy(name_slice).into();
-        // Override DPI if `WINIT_HIDPI_FACTOR` variable is set
-        let dpi_env = env::var("WINIT_HIDPI_FACTOR").ok().map_or_else(
+        // Override DPI if `WINIT_X11_SCALE_FACTOR` variable is set
+        let deprecated_dpi_override = env::var("WINIT_HIDPI_FACTOR").ok();
+        if deprecated_dpi_override.is_some() {
+            warn!(
+	            "The WINIT_HIDPI_FACTOR environment variable is deprecated; use WINIT_X11_SCALE_FACTOR"
+	        )
+        }
+        let dpi_env = env::var("WINIT_X11_SCALE_FACTOR").ok().map_or_else(
             || EnvVarDPI::NotSet,
             |var| {
                 if var.to_lowercase() == "randr" {
@@ -112,14 +118,14 @@ impl XConnection {
                     EnvVarDPI::NotSet
                 } else {
                     panic!(
-                        "`WINIT_HIDPI_FACTOR` invalid; DPI factors must be either normal floats greater than 0, or `randr`. Got `{}`",
+                        "`WINIT_X11_SCALE_FACTOR` invalid; DPI factors must be either normal floats greater than 0, or `randr`. Got `{}`",
                         var
                     );
                 }
             },
         );
 
-        let hidpi_factor = match dpi_env {
+        let scale_factor = match dpi_env {
             EnvVarDPI::Randr => calc_dpi_factor(
                 ((*crtc).width as u32, (*crtc).height as u32),
                 (
@@ -128,9 +134,9 @@ impl XConnection {
                 ),
             ),
             EnvVarDPI::Scale(dpi_override) => {
-                if !validate_hidpi_factor(dpi_override) {
+                if !validate_scale_factor(dpi_override) {
                     panic!(
-                        "`WINIT_HIDPI_FACTOR` invalid; DPI factors must be either normal floats greater than 0, or `randr`. Got `{}`",
+                        "`WINIT_X11_SCALE_FACTOR` invalid; DPI factors must be either normal floats greater than 0, or `randr`. Got `{}`",
                         dpi_override,
                     );
                 }
@@ -152,7 +158,7 @@ impl XConnection {
         };
 
         (self.xrandr.XRRFreeOutputInfo)(output_info);
-        Some((name, hidpi_factor, modes))
+        Some((name, scale_factor, modes))
     }
     pub fn set_crtc_config(&self, crtc_id: RRCrtc, mode_id: RRMode) -> Result<(), ()> {
         unsafe {

src/platform_impl/linux/x11/window.rs

@@ -15,7 +15,7 @@ use libc;
 use parking_lot::Mutex;
 
 use crate::{
-    dpi::{LogicalPosition, LogicalSize},
+    dpi::{PhysicalPosition, PhysicalSize, Position, Size},
     error::{ExternalError, NotSupportedError, OsError as RootOsError},
     monitor::{MonitorHandle as RootMonitorHandle, VideoMode as RootVideoMode},
     platform_impl::{
@@ -36,7 +36,7 @@ pub struct SharedState {
     pub inner_position: Option<(i32, i32)>,
     pub inner_position_rel_parent: Option<(i32, i32)>,
     pub last_monitor: X11MonitorHandle,
-    pub dpi_adjusted: Option<(f64, f64)>,
+    pub dpi_adjusted: Option<(u32, u32)>,
     pub fullscreen: Option<Fullscreen>,
     // Set when application calls `set_fullscreen` when window is not visible
     pub desired_fullscreen: Option<Option<Fullscreen>>,
@@ -45,8 +45,10 @@ pub struct SharedState {
     // Used to restore video mode after exiting fullscreen
     pub desktop_video_mode: Option<(ffi::RRCrtc, ffi::RRMode)>,
     pub frame_extents: Option<util::FrameExtentsHeuristic>,
-    pub min_inner_size: Option<LogicalSize>,
-    pub max_inner_size: Option<LogicalSize>,
+    pub min_inner_size: Option<Size>,
+    pub max_inner_size: Option<Size>,
+    pub resize_increments: Option<Size>,
+    pub base_size: Option<Size>,
     pub visibility: Visibility,
 }
 
@@ -83,6 +85,8 @@ impl SharedState {
             frame_extents: None,
             min_inner_size: None,
             max_inner_size: None,
+            resize_increments: None,
+            base_size: None,
         })
     }
 }
@@ -132,24 +136,24 @@ impl UnownedWindow {
                 })
                 .unwrap_or_else(|| monitors.swap_remove(0))
         };
-        let dpi_factor = guessed_monitor.hidpi_factor();
+        let dpi_factor = guessed_monitor.scale_factor();
 
-        info!("Guessed window DPI factor: {}", dpi_factor);
+        info!("Guessed window scale factor: {}", dpi_factor);
 
         let max_inner_size: Option<(u32, u32)> = window_attrs
             .max_inner_size
-            .map(|size| size.to_physical(dpi_factor).into());
+            .map(|size| size.to_physical::<u32>(dpi_factor).into());
         let min_inner_size: Option<(u32, u32)> = window_attrs
             .min_inner_size
-            .map(|size| size.to_physical(dpi_factor).into());
+            .map(|size| size.to_physical::<u32>(dpi_factor).into());
 
         let dimensions = {
             // x11 only applies constraints when the window is actively resized
             // by the user, so we have to manually apply the initial constraints
             let mut dimensions: (u32, u32) = window_attrs
                 .inner_size
+                .map(|size| size.to_physical::<u32>(dpi_factor))
                 .or_else(|| Some((800, 600).into()))
-                .map(|size| size.to_physical(dpi_factor))
                 .map(Into::into)
                 .unwrap();
             if let Some(max) = max_inner_size {
@@ -235,7 +239,7 @@ impl UnownedWindow {
             )
         };
 
-        let window = UnownedWindow {
+        let mut window = UnownedWindow {
             xconn: Arc::clone(xconn),
             xwindow,
             root,
@@ -320,10 +324,11 @@ impl UnownedWindow {
             {
                 let mut min_inner_size = window_attrs
                     .min_inner_size
-                    .map(|size| size.to_physical(dpi_factor));
+                    .map(|size| size.to_physical::<u32>(dpi_factor));
                 let mut max_inner_size = window_attrs
                     .max_inner_size
-                    .map(|size| size.to_physical(dpi_factor));
+                    .map(|size| size.to_physical::<u32>(dpi_factor));
+
                 if !window_attrs.resizable {
                     if util::wm_name_is_one_of(&["Xfwm4"]) {
                         warn!("To avoid a WM bug, disabling resizing has no effect on Xfwm4");
@@ -331,9 +336,11 @@ impl UnownedWindow {
                         max_inner_size = Some(dimensions.into());
                         min_inner_size = Some(dimensions.into());
 
-                        let mut shared_state_lock = window.shared_state.lock();
-                        shared_state_lock.min_inner_size = window_attrs.min_inner_size;
-                        shared_state_lock.max_inner_size = window_attrs.max_inner_size;
+                        let mut shared_state = window.shared_state.get_mut();
+                        shared_state.min_inner_size = window_attrs.min_inner_size;
+                        shared_state.max_inner_size = window_attrs.max_inner_size;
+                        shared_state.resize_increments = pl_attribs.resize_increments;
+                        shared_state.base_size = pl_attribs.base_size;
                     }
                 }
 
@@ -341,8 +348,16 @@ impl UnownedWindow {
                 normal_hints.set_size(Some(dimensions));
                 normal_hints.set_min_size(min_inner_size.map(Into::into));
                 normal_hints.set_max_size(max_inner_size.map(Into::into));
-                normal_hints.set_resize_increments(pl_attribs.resize_increments);
-                normal_hints.set_base_size(pl_attribs.base_size);
+                normal_hints.set_resize_increments(
+                    pl_attribs
+                        .resize_increments
+                        .map(|size| size.to_physical::<u32>(dpi_factor).into()),
+                );
+                normal_hints.set_base_size(
+                    pl_attribs
+                        .base_size
+                        .map(|size| size.to_physical::<u32>(dpi_factor).into()),
+                );
                 xconn.set_normal_hints(window.xwindow, normal_hints).queue();
             }
 
@@ -440,16 +455,6 @@ impl UnownedWindow {
             .map_err(|x_err| os_error!(OsError::XError(x_err)))
     }
 
-    fn logicalize_coords(&self, (x, y): (i32, i32)) -> LogicalPosition {
-        let dpi = self.hidpi_factor();
-        LogicalPosition::from_physical((x, y), dpi)
-    }
-
-    fn logicalize_size(&self, (width, height): (u32, u32)) -> LogicalSize {
-        let dpi = self.hidpi_factor();
-        LogicalSize::from_physical((width, height), dpi)
-    }
-
     fn set_pid(&self) -> Option<util::Flusher<'_>> {
         let pid_atom = unsafe { self.xconn.get_atom_unchecked(b"_NET_WM_PID\0") };
         let client_machine_atom = unsafe { self.xconn.get_atom_unchecked(b"WM_CLIENT_MACHINE\0") };
@@ -951,11 +956,11 @@ impl UnownedWindow {
     }
 
     #[inline]
-    pub fn outer_position(&self) -> Result<LogicalPosition, NotSupportedError> {
+    pub fn outer_position(&self) -> Result<PhysicalPosition<i32>, NotSupportedError> {
         let extents = (*self.shared_state.lock()).frame_extents.clone();
         if let Some(extents) = extents {
-            let logical = self.inner_position().unwrap();
-            Ok(extents.inner_pos_to_outer_logical(logical, self.hidpi_factor()))
+            let (x, y) = self.inner_position_physical();
+            Ok(extents.inner_pos_to_outer(x, y).into())
         } else {
             self.update_cached_frame_extents();
             self.outer_position()
@@ -972,8 +977,8 @@ impl UnownedWindow {
     }
 
     #[inline]
-    pub fn inner_position(&self) -> Result<LogicalPosition, NotSupportedError> {
-        Ok(self.logicalize_coords(self.inner_position_physical()))
+    pub fn inner_position(&self) -> Result<PhysicalPosition<i32>, NotSupportedError> {
+        Ok(self.inner_position_physical().into())
     }
 
     pub(crate) fn set_position_inner(&self, mut x: i32, mut y: i32) -> util::Flusher<'_> {
@@ -1002,8 +1007,8 @@ impl UnownedWindow {
     }
 
     #[inline]
-    pub fn set_outer_position(&self, logical_position: LogicalPosition) {
-        let (x, y) = logical_position.to_physical(self.hidpi_factor()).into();
+    pub fn set_outer_position(&self, position: Position) {
+        let (x, y) = position.to_physical::<i32>(self.scale_factor()).into();
         self.set_position_physical(x, y);
     }
 
@@ -1017,16 +1022,16 @@ impl UnownedWindow {
     }
 
     #[inline]
-    pub fn inner_size(&self) -> LogicalSize {
-        self.logicalize_size(self.inner_size_physical())
+    pub fn inner_size(&self) -> PhysicalSize<u32> {
+        self.inner_size_physical().into()
     }
 
     #[inline]
-    pub fn outer_size(&self) -> LogicalSize {
+    pub fn outer_size(&self) -> PhysicalSize<u32> {
         let extents = self.shared_state.lock().frame_extents.clone();
         if let Some(extents) = extents {
-            let logical = self.inner_size();
-            extents.inner_size_to_outer_logical(logical, self.hidpi_factor())
+            let (width, height) = self.inner_size_physical();
+            extents.inner_size_to_outer(width, height).into()
         } else {
             self.update_cached_frame_extents();
             self.outer_size()
@@ -1047,9 +1052,9 @@ impl UnownedWindow {
     }
 
     #[inline]
-    pub fn set_inner_size(&self, logical_size: LogicalSize) {
-        let dpi_factor = self.hidpi_factor();
-        let (width, height) = logical_size.to_physical(dpi_factor).into();
+    pub fn set_inner_size(&self, size: Size) {
+        let dpi_factor = self.scale_factor();
+        let (width, height) = size.to_physical::<u32>(dpi_factor).into();
         self.set_inner_size_physical(width, height);
     }
 
@@ -1070,10 +1075,10 @@ impl UnownedWindow {
     }
 
     #[inline]
-    pub fn set_min_inner_size(&self, logical_dimensions: Option<LogicalSize>) {
-        self.shared_state.lock().min_inner_size = logical_dimensions;
-        let physical_dimensions = logical_dimensions
-            .map(|logical_dimensions| logical_dimensions.to_physical(self.hidpi_factor()).into());
+    pub fn set_min_inner_size(&self, dimensions: Option<Size>) {
+        self.shared_state.lock().min_inner_size = dimensions;
+        let physical_dimensions =
+            dimensions.map(|dimensions| dimensions.to_physical::<u32>(self.scale_factor()).into());
         self.set_min_inner_size_physical(physical_dimensions);
     }
 
@@ -1083,10 +1088,10 @@ impl UnownedWindow {
     }
 
     #[inline]
-    pub fn set_max_inner_size(&self, logical_dimensions: Option<LogicalSize>) {
-        self.shared_state.lock().max_inner_size = logical_dimensions;
-        let physical_dimensions = logical_dimensions
-            .map(|logical_dimensions| logical_dimensions.to_physical(self.hidpi_factor()).into());
+    pub fn set_max_inner_size(&self, dimensions: Option<Size>) {
+        self.shared_state.lock().max_inner_size = dimensions;
+        let physical_dimensions =
+            dimensions.map(|dimensions| dimensions.to_physical::<u32>(self.scale_factor()).into());
         self.set_max_inner_size_physical(physical_dimensions);
     }
 
@@ -1094,37 +1099,29 @@ impl UnownedWindow {
         &self,
         old_dpi_factor: f64,
         new_dpi_factor: f64,
-        width: f64,
-        height: f64,
-    ) -> (f64, f64, util::Flusher<'_>) {
+        width: u32,
+        height: u32,
+        shared_state: &SharedState,
+    ) -> (u32, u32) {
         let scale_factor = new_dpi_factor / old_dpi_factor;
-        let new_width = width * scale_factor;
-        let new_height = height * scale_factor;
         self.update_normal_hints(|normal_hints| {
-            let dpi_adjuster = |(width, height): (u32, u32)| -> (u32, u32) {
-                let new_width = width as f64 * scale_factor;
-                let new_height = height as f64 * scale_factor;
-                (new_width.round() as u32, new_height.round() as u32)
-            };
-            let max_size = normal_hints.get_max_size().map(&dpi_adjuster);
-            let min_size = normal_hints.get_min_size().map(&dpi_adjuster);
-            let resize_increments = normal_hints.get_resize_increments().map(&dpi_adjuster);
-            let base_size = normal_hints.get_base_size().map(&dpi_adjuster);
+            let dpi_adjuster =
+                |size: Size| -> (u32, u32) { size.to_physical::<u32>(new_dpi_factor).into() };
+            let max_size = shared_state.max_inner_size.map(&dpi_adjuster);
+            let min_size = shared_state.min_inner_size.map(&dpi_adjuster);
+            let resize_increments = shared_state.resize_increments.map(&dpi_adjuster);
+            let base_size = shared_state.base_size.map(&dpi_adjuster);
             normal_hints.set_max_size(max_size);
             normal_hints.set_min_size(min_size);
             normal_hints.set_resize_increments(resize_increments);
             normal_hints.set_base_size(base_size);
         })
         .expect("Failed to update normal hints");
-        unsafe {
-            (self.xconn.xlib.XResizeWindow)(
-                self.xconn.display,
-                self.xwindow,
-                new_width.round() as c_uint,
-                new_height.round() as c_uint,
-            );
-        }
-        (new_width, new_height, util::Flusher::new(&self.xconn))
+
+        let new_width = (width as f64 * scale_factor).round() as u32;
+        let new_height = (height as f64 * scale_factor).round() as u32;
+
+        (new_width, new_height)
     }
 
     pub fn set_resizable(&self, resizable: bool) {
@@ -1136,25 +1133,25 @@ impl UnownedWindow {
             return;
         }
 
-        let (logical_min, logical_max) = if resizable {
+        let (min_size, max_size) = if resizable {
             let shared_state_lock = self.shared_state.lock();
             (
                 shared_state_lock.min_inner_size,
                 shared_state_lock.max_inner_size,
             )
         } else {
-            let window_size = Some(self.inner_size());
+            let window_size = Some(Size::from(self.inner_size()));
             (window_size.clone(), window_size)
         };
 
         self.set_maximizable_inner(resizable).queue();
 
-        let dpi_factor = self.hidpi_factor();
-        let min_inner_size = logical_min
-            .map(|logical_size| logical_size.to_physical(dpi_factor))
+        let dpi_factor = self.scale_factor();
+        let min_inner_size = min_size
+            .map(|size| size.to_physical::<u32>(dpi_factor))
             .map(Into::into);
-        let max_inner_size = logical_max
-            .map(|logical_size| logical_size.to_physical(dpi_factor))
+        let max_inner_size = max_size
+            .map(|size| size.to_physical::<u32>(dpi_factor))
             .map(Into::into);
         self.update_normal_hints(|normal_hints| {
             normal_hints.set_min_size(min_inner_size);
@@ -1275,8 +1272,8 @@ impl UnownedWindow {
     }
 
     #[inline]
-    pub fn hidpi_factor(&self) -> f64 {
-        self.current_monitor().hidpi_factor
+    pub fn scale_factor(&self) -> f64 {
+        self.current_monitor().scale_factor
     }
 
     pub fn set_cursor_position_physical(&self, x: i32, y: i32) -> Result<(), ExternalError> {
@@ -1289,11 +1286,8 @@ impl UnownedWindow {
     }
 
     #[inline]
-    pub fn set_cursor_position(
-        &self,
-        logical_position: LogicalPosition,
-    ) -> Result<(), ExternalError> {
-        let (x, y) = logical_position.to_physical(self.hidpi_factor()).into();
+    pub fn set_cursor_position(&self, position: Position) -> Result<(), ExternalError> {
+        let (x, y) = position.to_physical::<i32>(self.scale_factor()).into();
         self.set_cursor_position_physical(x, y)
     }
 
@@ -1305,8 +1299,8 @@ impl UnownedWindow {
     }
 
     #[inline]
-    pub fn set_ime_position(&self, logical_spot: LogicalPosition) {
-        let (x, y) = logical_spot.to_physical(self.hidpi_factor()).into();
+    pub fn set_ime_position(&self, spot: Position) {
+        let (x, y) = spot.to_physical::<i32>(self.scale_factor()).into();
         self.set_ime_position_physical(x, y);
     }
 

src/platform_impl/macos/app.rs

@@ -11,7 +11,7 @@ use objc::{
 
 use crate::{
     event::{DeviceEvent, ElementState, Event},
-    platform_impl::platform::{app_state::AppState, util, DEVICE_ID},
+    platform_impl::platform::{app_state::AppState, event::EventWrapper, util, DEVICE_ID},
 };
 
 pub struct AppClass(pub *const Class);
@@ -71,32 +71,32 @@ unsafe fn maybe_dispatch_device_event(event: id) {
             let delta_y = event.deltaY() as f64;
 
             if delta_x != 0.0 {
-                events.push_back(Event::DeviceEvent {
+                events.push_back(EventWrapper::StaticEvent(Event::DeviceEvent {
                     device_id: DEVICE_ID,
                     event: DeviceEvent::Motion {
                         axis: 0,
                         value: delta_x,
                     },
-                });
+                }));
             }
 
             if delta_y != 0.0 {
-                events.push_back(Event::DeviceEvent {
+                events.push_back(EventWrapper::StaticEvent(Event::DeviceEvent {
                     device_id: DEVICE_ID,
                     event: DeviceEvent::Motion {
                         axis: 1,
                         value: delta_y,
                     },
-                });
+                }));
             }
 
             if delta_x != 0.0 || delta_y != 0.0 {
-                events.push_back(Event::DeviceEvent {
+                events.push_back(EventWrapper::StaticEvent(Event::DeviceEvent {
                     device_id: DEVICE_ID,
                     event: DeviceEvent::MouseMotion {
                         delta: (delta_x, delta_y),
                     },
-                });
+                }));
             }
 
             AppState::queue_events(events);
@@ -104,26 +104,26 @@ unsafe fn maybe_dispatch_device_event(event: id) {
         appkit::NSLeftMouseDown | appkit::NSRightMouseDown | appkit::NSOtherMouseDown => {
             let mut events = VecDeque::with_capacity(1);
 
-            events.push_back(Event::DeviceEvent {
+            events.push_back(EventWrapper::StaticEvent(Event::DeviceEvent {
                 device_id: DEVICE_ID,
                 event: DeviceEvent::Button {
                     button: event.buttonNumber() as u32,
                     state: ElementState::Pressed,
                 },
-            });
+            }));
 
             AppState::queue_events(events);
         }
         appkit::NSLeftMouseUp | appkit::NSRightMouseUp | appkit::NSOtherMouseUp => {
             let mut events = VecDeque::with_capacity(1);
 
-            events.push_back(Event::DeviceEvent {
+            events.push_back(EventWrapper::StaticEvent(Event::DeviceEvent {
                 device_id: DEVICE_ID,
                 event: DeviceEvent::Button {
                     button: event.buttonNumber() as u32,
                     state: ElementState::Released,
                 },
-            });
+            }));
 
             AppState::queue_events(events);
         }

src/platform_impl/macos/app_state.rs

@@ -12,15 +12,21 @@ use std::{
 };
 
 use cocoa::{
-    appkit::NSApp,
+    appkit::{NSApp, NSWindow},
     base::nil,
-    foundation::{NSAutoreleasePool, NSString},
+    foundation::{NSAutoreleasePool, NSSize, NSString},
 };
 
 use crate::{
-    event::{Event, StartCause},
+    dpi::LogicalSize,
+    event::{Event, StartCause, WindowEvent},
     event_loop::{ControlFlow, EventLoopWindowTarget as RootWindowTarget},
-    platform_impl::platform::{observer::EventLoopWaker, util::Never},
+    platform_impl::platform::{
+        event::{EventProxy, EventWrapper},
+        observer::EventLoopWaker,
+        util::{IdRef, Never},
+        window::get_window_id,
+    },
     window::WindowId,
 };
 use objc::runtime::Object;
@@ -29,8 +35,8 @@ lazy_static! {
     static ref HANDLER: Handler = Default::default();
 }
 
-impl Event<Never> {
-    fn userify<T: 'static>(self) -> Event<T> {
+impl<'a, Never> Event<'a, Never> {
+    fn userify<T: 'static>(self) -> Event<'a, T> {
         self.map_nonuser_event()
             // `Never` can't be constructed, so the `UserEvent` variant can't
             // be present here.
@@ -39,12 +45,13 @@ impl Event<Never> {
 }
 
 pub trait EventHandler: Debug {
-    fn handle_nonuser_event(&mut self, event: Event<Never>, control_flow: &mut ControlFlow);
+    // Not sure probably it should accept Event<'static, Never>
+    fn handle_nonuser_event(&mut self, event: Event<'_, Never>, control_flow: &mut ControlFlow);
     fn handle_user_events(&mut self, control_flow: &mut ControlFlow);
 }
 
 struct EventLoopHandler<T: 'static> {
-    callback: Box<dyn FnMut(Event<T>, &RootWindowTarget<T>, &mut ControlFlow)>,
+    callback: Box<dyn FnMut(Event<'_, T>, &RootWindowTarget<T>, &mut ControlFlow)>,
     will_exit: bool,
     window_target: Rc<RootWindowTarget<T>>,
 }
@@ -59,7 +66,7 @@ impl<T> Debug for EventLoopHandler<T> {
 }
 
 impl<T> EventHandler for EventLoopHandler<T> {
-    fn handle_nonuser_event(&mut self, event: Event<Never>, control_flow: &mut ControlFlow) {
+    fn handle_nonuser_event(&mut self, event: Event<'_, Never>, control_flow: &mut ControlFlow) {
         (self.callback)(event.userify(), &self.window_target, control_flow);
         self.will_exit |= *control_flow == ControlFlow::Exit;
         if self.will_exit {
@@ -88,7 +95,7 @@ struct Handler {
     control_flow_prev: Mutex<ControlFlow>,
     start_time: Mutex<Option<Instant>>,
     callback: Mutex<Option<Box<dyn EventHandler>>>,
-    pending_events: Mutex<VecDeque<Event<Never>>>,
+    pending_events: Mutex<VecDeque<EventWrapper>>,
     pending_redraw: Mutex<Vec<WindowId>>,
     waker: Mutex<EventLoopWaker>,
 }
@@ -97,7 +104,7 @@ unsafe impl Send for Handler {}
 unsafe impl Sync for Handler {}
 
 impl Handler {
-    fn events<'a>(&'a self) -> MutexGuard<'a, VecDeque<Event<Never>>> {
+    fn events(&self) -> MutexGuard<'_, VecDeque<EventWrapper>> {
         self.pending_events.lock().unwrap()
     }
 
@@ -105,7 +112,7 @@ impl Handler {
         self.pending_redraw.lock().unwrap()
     }
 
-    fn waker<'a>(&'a self) -> MutexGuard<'a, EventLoopWaker> {
+    fn waker(&self) -> MutexGuard<'_, EventLoopWaker> {
         self.waker.lock().unwrap()
     }
 
@@ -141,7 +148,7 @@ impl Handler {
         *self.start_time.lock().unwrap() = Some(Instant::now());
     }
 
-    fn take_events(&self) -> VecDeque<Event<Never>> {
+    fn take_events(&self) -> VecDeque<EventWrapper> {
         mem::replace(&mut *self.events(), Default::default())
     }
 
@@ -157,9 +164,14 @@ impl Handler {
         self.in_callback.store(in_callback, Ordering::Release);
     }
 
-    fn handle_nonuser_event(&self, event: Event<Never>) {
+    fn handle_nonuser_event(&self, wrapper: EventWrapper) {
         if let Some(ref mut callback) = *self.callback.lock().unwrap() {
-            callback.handle_nonuser_event(event, &mut *self.control_flow.lock().unwrap());
+            match wrapper {
+                EventWrapper::StaticEvent(event) => {
+                    callback.handle_nonuser_event(event, &mut *self.control_flow.lock().unwrap())
+                }
+                EventWrapper::EventProxy(proxy) => self.handle_proxy(proxy, callback),
+            }
         }
     }
 
@@ -168,6 +180,46 @@ impl Handler {
             callback.handle_user_events(&mut *self.control_flow.lock().unwrap());
         }
     }
+
+    fn handle_scale_factor_changed_event(
+        &self,
+        callback: &mut Box<dyn EventHandler + 'static>,
+        ns_window: IdRef,
+        suggested_size: LogicalSize<f64>,
+        scale_factor: f64,
+    ) {
+        let mut size = suggested_size.to_physical(scale_factor);
+        let new_inner_size = &mut size;
+        let event = Event::WindowEvent {
+            window_id: WindowId(get_window_id(*ns_window)),
+            event: WindowEvent::ScaleFactorChanged {
+                scale_factor,
+                new_inner_size,
+            },
+        };
+
+        callback.handle_nonuser_event(event, &mut *self.control_flow.lock().unwrap());
+
+        let physical_size = *new_inner_size;
+        let logical_size = physical_size.to_logical(scale_factor);
+        let size = NSSize::new(logical_size.width, logical_size.height);
+        unsafe { NSWindow::setContentSize_(*ns_window, size) };
+    }
+
+    fn handle_proxy(&self, proxy: EventProxy, callback: &mut Box<dyn EventHandler + 'static>) {
+        match proxy {
+            EventProxy::DpiChangedProxy {
+                ns_window,
+                suggested_size,
+                scale_factor,
+            } => self.handle_scale_factor_changed_event(
+                callback,
+                ns_window,
+                suggested_size,
+                scale_factor,
+            ),
+        }
+    }
 }
 
 pub enum AppState {}
@@ -176,7 +228,7 @@ impl AppState {
     // This function extends lifetime of `callback` to 'static as its side effect
     pub unsafe fn set_callback<F, T>(callback: F, window_target: Rc<RootWindowTarget<T>>)
     where
-        F: FnMut(Event<T>, &RootWindowTarget<T>, &mut ControlFlow),
+        F: FnMut(Event<'_, T>, &RootWindowTarget<T>, &mut ControlFlow),
     {
         *HANDLER.callback.lock().unwrap() = Some(Box::new(EventLoopHandler {
             // This transmute is always safe, in case it was reached through `run`, since our
@@ -184,8 +236,8 @@ impl AppState {
             // they passed to callback will actually outlive it, some apps just can't move
             // everything to event loop, so this is something that they should care about.
             callback: mem::transmute::<
-                Box<dyn FnMut(Event<T>, &RootWindowTarget<T>, &mut ControlFlow)>,
-                Box<dyn FnMut(Event<T>, &RootWindowTarget<T>, &mut ControlFlow)>,
+                Box<dyn FnMut(Event<'_, T>, &RootWindowTarget<T>, &mut ControlFlow)>,
+                Box<dyn FnMut(Event<'_, T>, &RootWindowTarget<T>, &mut ControlFlow)>,
             >(Box::new(callback)),
             will_exit: false,
             window_target,
@@ -194,7 +246,7 @@ impl AppState {
 
     pub fn exit() {
         HANDLER.set_in_callback(true);
-        HANDLER.handle_nonuser_event(Event::LoopDestroyed);
+        HANDLER.handle_nonuser_event(EventWrapper::StaticEvent(Event::LoopDestroyed));
         HANDLER.set_in_callback(false);
         HANDLER.callback.lock().unwrap().take();
     }
@@ -203,7 +255,9 @@ impl AppState {
         HANDLER.set_ready();
         HANDLER.waker().start();
         HANDLER.set_in_callback(true);
-        HANDLER.handle_nonuser_event(Event::NewEvents(StartCause::Init));
+        HANDLER.handle_nonuser_event(EventWrapper::StaticEvent(Event::NewEvents(
+            StartCause::Init,
+        )));
         HANDLER.set_in_callback(false);
     }
 
@@ -234,7 +288,7 @@ impl AppState {
             ControlFlow::Exit => StartCause::Poll, //panic!("unexpected `ControlFlow::Exit`"),
         };
         HANDLER.set_in_callback(true);
-        HANDLER.handle_nonuser_event(Event::NewEvents(cause));
+        HANDLER.handle_nonuser_event(EventWrapper::StaticEvent(Event::NewEvents(cause)));
         HANDLER.set_in_callback(false);
     }
 
@@ -246,18 +300,18 @@ impl AppState {
         }
     }
 
-    pub fn queue_event(event: Event<Never>) {
+    pub fn queue_event(wrapper: EventWrapper) {
         if !unsafe { msg_send![class!(NSThread), isMainThread] } {
-            panic!("Event queued from different thread: {:#?}", event);
+            panic!("Event queued from different thread: {:#?}", wrapper);
         }
-        HANDLER.events().push_back(event);
+        HANDLER.events().push_back(wrapper);
     }
 
-    pub fn queue_events(mut events: VecDeque<Event<Never>>) {
+    pub fn queue_events(mut wrappers: VecDeque<EventWrapper>) {
         if !unsafe { msg_send![class!(NSThread), isMainThread] } {
-            panic!("Events queued from different thread: {:#?}", events);
+            panic!("Events queued from different thread: {:#?}", wrappers);
         }
-        HANDLER.events().append(&mut events);
+        HANDLER.events().append(&mut wrappers);
     }
 
     pub fn cleared() {
@@ -270,11 +324,13 @@ impl AppState {
             for event in HANDLER.take_events() {
                 HANDLER.handle_nonuser_event(event);
             }
-            HANDLER.handle_nonuser_event(Event::MainEventsCleared);
+            HANDLER.handle_nonuser_event(EventWrapper::StaticEvent(Event::MainEventsCleared));
             for window_id in HANDLER.should_redraw() {
-                HANDLER.handle_nonuser_event(Event::RedrawRequested(window_id));
+                HANDLER.handle_nonuser_event(EventWrapper::StaticEvent(Event::RedrawRequested(
+                    window_id,
+                )));
             }
-            HANDLER.handle_nonuser_event(Event::RedrawEventsCleared);
+            HANDLER.handle_nonuser_event(EventWrapper::StaticEvent(Event::RedrawEventsCleared));
             HANDLER.set_in_callback(false);
         }
         if HANDLER.should_exit() {

src/platform_impl/macos/event.rs

@@ -6,10 +6,29 @@ use cocoa::{
 };
 
 use crate::{
-    event::{ElementState, KeyboardInput, ModifiersState, VirtualKeyCode, WindowEvent},
-    platform_impl::platform::DEVICE_ID,
+    dpi::LogicalSize,
+    event::{ElementState, Event, KeyboardInput, ModifiersState, VirtualKeyCode, WindowEvent},
+    platform_impl::platform::{
+        util::{IdRef, Never},
+        DEVICE_ID,
+    },
 };
 
+#[derive(Debug)]
+pub enum EventWrapper {
+    StaticEvent(Event<'static, Never>),
+    EventProxy(EventProxy),
+}
+
+#[derive(Debug, PartialEq)]
+pub enum EventProxy {
+    DpiChangedProxy {
+        ns_window: IdRef,
+        suggested_size: LogicalSize<f64>,
+        scale_factor: f64,
+    },
+}
+
 pub fn char_to_keycode(c: char) -> Option<VirtualKeyCode> {
     // We only translate keys that are affected by keyboard layout.
     //
@@ -256,7 +275,7 @@ pub unsafe fn modifier_event(
     ns_event: id,
     keymask: NSEventModifierFlags,
     was_key_pressed: bool,
-) -> Option<WindowEvent> {
+) -> Option<WindowEvent<'static>> {
     if !was_key_pressed && NSEvent::modifierFlags(ns_event).contains(keymask)
         || was_key_pressed && !NSEvent::modifierFlags(ns_event).contains(keymask)
     {

src/platform_impl/macos/event_loop.rs

@@ -84,7 +84,7 @@ impl<T> EventLoop<T> {
 
     pub fn run<F>(mut self, callback: F) -> !
     where
-        F: 'static + FnMut(Event<T>, &RootWindowTarget<T>, &mut ControlFlow),
+        F: 'static + FnMut(Event<'_, T>, &RootWindowTarget<T>, &mut ControlFlow),
     {
         self.run_return(callback);
         process::exit(0);
@@ -92,7 +92,7 @@ impl<T> EventLoop<T> {
 
     pub fn run_return<F>(&mut self, callback: F)
     where
-        F: FnMut(Event<T>, &RootWindowTarget<T>, &mut ControlFlow),
+        F: FnMut(Event<'_, T>, &RootWindowTarget<T>, &mut ControlFlow),
     {
         unsafe {
             let pool = NSAutoreleasePool::new(nil);

src/platform_impl/macos/monitor.rs

@@ -84,7 +84,7 @@ impl Clone for NativeDisplayMode {
 }
 
 impl VideoMode {
-    pub fn size(&self) -> PhysicalSize {
+    pub fn size(&self) -> PhysicalSize<u32> {
         self.size.into()
     }
 
@@ -166,9 +166,9 @@ impl fmt::Debug for MonitorHandle {
         struct MonitorHandle {
             name: Option<String>,
             native_identifier: u32,
-            size: PhysicalSize,
-            position: PhysicalPosition,
-            hidpi_factor: f64,
+            size: PhysicalSize<u32>,
+            position: PhysicalPosition<i32>,
+            scale_factor: f64,
         }
 
         let monitor_id_proxy = MonitorHandle {
@@ -176,7 +176,7 @@ impl fmt::Debug for MonitorHandle {
             native_identifier: self.native_identifier(),
             size: self.size(),
             position: self.position(),
-            hidpi_factor: self.hidpi_factor(),
+            scale_factor: self.scale_factor(),
         };
 
         monitor_id_proxy.fmt(f)
@@ -199,24 +199,24 @@ impl MonitorHandle {
         self.0
     }
 
-    pub fn size(&self) -> PhysicalSize {
+    pub fn size(&self) -> PhysicalSize<u32> {
         let MonitorHandle(display_id) = *self;
         let display = CGDisplay::new(display_id);
         let height = display.pixels_high();
         let width = display.pixels_wide();
-        PhysicalSize::from_logical((width as f64, height as f64), self.hidpi_factor())
+        PhysicalSize::from_logical::<_, f64>((width as f64, height as f64), self.scale_factor())
     }
 
     #[inline]
-    pub fn position(&self) -> PhysicalPosition {
+    pub fn position(&self) -> PhysicalPosition<i32> {
         let bounds = unsafe { CGDisplayBounds(self.native_identifier()) };
-        PhysicalPosition::from_logical(
+        PhysicalPosition::from_logical::<_, f64>(
             (bounds.origin.x as f64, bounds.origin.y as f64),
-            self.hidpi_factor(),
+            self.scale_factor(),
         )
     }
 
-    pub fn hidpi_factor(&self) -> f64 {
+    pub fn scale_factor(&self) -> f64 {
         let screen = match self.ns_screen() {
             Some(screen) => screen,
             None => return 1.0, // default to 1.0 when we can't find the screen

src/platform_impl/macos/util/async.rs

@@ -73,10 +73,10 @@ pub unsafe fn set_style_mask_sync(ns_window: id, ns_view: id, mask: NSWindowStyl
 
 struct SetContentSizeData {
     ns_window: id,
-    size: LogicalSize,
+    size: LogicalSize<f64>,
 }
 impl SetContentSizeData {
-    fn new_ptr(ns_window: id, size: LogicalSize) -> *mut Self {
+    fn new_ptr(ns_window: id, size: LogicalSize<f64>) -> *mut Self {
         Box::into_raw(Box::new(SetContentSizeData { ns_window, size }))
     }
 }
@@ -98,7 +98,7 @@ extern "C" fn set_content_size_callback(context: *mut c_void) {
 }
 // `setContentSize:` isn't thread-safe either, though it doesn't log any errors
 // and just fails silently. Anyway, GCD to the rescue!
-pub unsafe fn set_content_size_async(ns_window: id, size: LogicalSize) {
+pub unsafe fn set_content_size_async(ns_window: id, size: LogicalSize<f64>) {
     let context = SetContentSizeData::new_ptr(ns_window, size);
     dispatch_async_f(
         dispatch_get_main_queue(),

src/platform_impl/macos/util/mod.rs

@@ -31,6 +31,7 @@ pub const EMPTY_RANGE: ffi::NSRange = ffi::NSRange {
     length: 0,
 };
 
+#[derive(Debug, PartialEq)]
 pub struct IdRef(id);
 
 impl IdRef {

src/platform_impl/macos/view.rs

@@ -25,7 +25,7 @@ use crate::{
         app_state::AppState,
         event::{
             char_to_keycode, check_function_keys, event_mods, get_scancode, modifier_event,
-            scancode_to_keycode,
+            scancode_to_keycode, EventWrapper,
         },
         ffi::*,
         util::{self, IdRef},
@@ -512,10 +512,10 @@ extern "C" fn insert_text(this: &Object, _sel: Sel, string: id, _replacement_ran
 
         let mut events = VecDeque::with_capacity(characters.len());
         for character in string.chars().filter(|c| !is_corporate_character(*c)) {
-            events.push_back(Event::WindowEvent {
+            events.push_back(EventWrapper::StaticEvent(Event::WindowEvent {
                 window_id: WindowId(get_window_id(state.ns_window)),
                 event: WindowEvent::ReceivedCharacter(character),
-            });
+            }));
         }
 
         AppState::queue_events(events);
@@ -536,10 +536,10 @@ extern "C" fn do_command_by_selector(this: &Object, _sel: Sel, command: Sel) {
             // The `else` condition would emit the same character, but I'm keeping this here both...
             // 1) as a reminder for how `doCommandBySelector` works
             // 2) to make our use of carriage return explicit
-            events.push_back(Event::WindowEvent {
+            events.push_back(EventWrapper::StaticEvent(Event::WindowEvent {
                 window_id: WindowId(get_window_id(state.ns_window)),
                 event: WindowEvent::ReceivedCharacter('\r'),
-            });
+            }));
         } else {
             let raw_characters = state.raw_characters.take();
             if let Some(raw_characters) = raw_characters {
@@ -547,10 +547,10 @@ extern "C" fn do_command_by_selector(this: &Object, _sel: Sel, command: Sel) {
                     .chars()
                     .filter(|c| !is_corporate_character(*c))
                 {
-                    events.push_back(Event::WindowEvent {
+                    events.push_back(EventWrapper::StaticEvent(Event::WindowEvent {
                         window_id: WindowId(get_window_id(state.ns_window)),
                         event: WindowEvent::ReceivedCharacter(character),
-                    });
+                    }));
                 }
             }
         };
@@ -646,14 +646,14 @@ extern "C" fn key_down(this: &Object, _sel: Sel, event: id) {
         };
 
         let pass_along = {
-            AppState::queue_event(window_event);
+            AppState::queue_event(EventWrapper::StaticEvent(window_event));
             // Emit `ReceivedCharacter` for key repeats
             if is_repeat && state.is_key_down {
                 for character in characters.chars().filter(|c| !is_corporate_character(*c)) {
-                    AppState::queue_event(Event::WindowEvent {
+                    AppState::queue_event(EventWrapper::StaticEvent(Event::WindowEvent {
                         window_id,
                         event: WindowEvent::ReceivedCharacter(character),
-                    });
+                    }));
                 }
                 false
             } else {
@@ -697,7 +697,7 @@ extern "C" fn key_up(this: &Object, _sel: Sel, event: id) {
             },
         };
 
-        AppState::queue_event(window_event);
+        AppState::queue_event(EventWrapper::StaticEvent(window_event));
     }
     trace!("Completed `keyUp`");
 }
@@ -747,16 +747,16 @@ extern "C" fn flags_changed(this: &Object, _sel: Sel, event: id) {
         }
 
         for event in events {
-            AppState::queue_event(Event::WindowEvent {
+            AppState::queue_event(EventWrapper::StaticEvent(Event::WindowEvent {
                 window_id: WindowId(get_window_id(state.ns_window)),
                 event,
-            });
+            }));
         }
 
-        AppState::queue_event(Event::DeviceEvent {
+        AppState::queue_event(EventWrapper::StaticEvent(Event::DeviceEvent {
             device_id: DEVICE_ID,
             event: DeviceEvent::ModifiersChanged(state.modifiers),
-        });
+        }));
     }
     trace!("Completed `flagsChanged`");
 }
@@ -811,7 +811,7 @@ extern "C" fn cancel_operation(this: &Object, _sel: Sel, _sender: id) {
             },
         };
 
-        AppState::queue_event(window_event);
+        AppState::queue_event(EventWrapper::StaticEvent(window_event));
     }
     trace!("Completed `cancelOperation`");
 }
@@ -831,7 +831,7 @@ fn mouse_click(this: &Object, event: id, button: MouseButton, button_state: Elem
             },
         };
 
-        AppState::queue_event(window_event);
+        AppState::queue_event(EventWrapper::StaticEvent(window_event));
     }
 }
 
@@ -892,7 +892,7 @@ fn mouse_motion(this: &Object, event: id) {
             },
         };
 
-        AppState::queue_event(window_event);
+        AppState::queue_event(EventWrapper::StaticEvent(window_event));
     }
 }
 
@@ -944,8 +944,8 @@ extern "C" fn mouse_entered(this: &Object, _sel: Sel, event: id) {
             }
         };
 
-        AppState::queue_event(enter_event);
-        AppState::queue_event(move_event);
+        AppState::queue_event(EventWrapper::StaticEvent(enter_event));
+        AppState::queue_event(EventWrapper::StaticEvent(move_event));
     }
     trace!("Completed `mouseEntered`");
 }
@@ -963,7 +963,7 @@ extern "C" fn mouse_exited(this: &Object, _sel: Sel, _event: id) {
             },
         };
 
-        AppState::queue_event(window_event);
+        AppState::queue_event(EventWrapper::StaticEvent(window_event));
     }
     trace!("Completed `mouseExited`");
 }
@@ -1005,8 +1005,8 @@ extern "C" fn scroll_wheel(this: &Object, _sel: Sel, event: id) {
             },
         };
 
-        AppState::queue_event(device_event);
-        AppState::queue_event(window_event);
+        AppState::queue_event(EventWrapper::StaticEvent(device_event));
+        AppState::queue_event(EventWrapper::StaticEvent(window_event));
     }
     trace!("Completed `scrollWheel`");
 }
@@ -1029,7 +1029,7 @@ extern "C" fn pressure_change_with_event(this: &Object, _sel: Sel, event: id) {
             },
         };
 
-        AppState::queue_event(window_event);
+        AppState::queue_event(EventWrapper::StaticEvent(window_event));
     }
     trace!("Completed `pressureChangeWithEvent`");
 }

src/platform_impl/macos/window.rs

@@ -10,7 +10,9 @@ use std::{
 };
 
 use crate::{
-    dpi::{LogicalPosition, LogicalSize},
+    dpi::{
+        LogicalPosition, LogicalSize, PhysicalPosition, PhysicalSize, Position, Size, Size::Logical,
+    },
     error::{ExternalError, NotSupportedError, OsError as RootOsError},
     icon::Icon,
     monitor::{MonitorHandle as RootMonitorHandle, VideoMode as RootVideoMode},
@@ -66,7 +68,7 @@ pub struct PlatformSpecificWindowBuilderAttributes {
     pub titlebar_hidden: bool,
     pub titlebar_buttons_hidden: bool,
     pub fullsize_content_view: bool,
-    pub resize_increments: Option<LogicalSize>,
+    pub resize_increments: Option<LogicalSize<f64>>,
     pub disallow_hidpi: bool,
 }
 
@@ -130,12 +132,17 @@ fn create_window(
             None => None,
         };
         let frame = match screen {
-            Some(screen) => appkit::NSScreen::frame(screen),
+            Some(screen) => NSScreen::frame(screen),
             None => {
-                let (width, height) = attrs
-                    .inner_size
-                    .map(|logical| (logical.width, logical.height))
-                    .unwrap_or_else(|| (800.0, 600.0));
+                let screen = NSScreen::mainScreen(nil);
+                let scale_factor = NSScreen::backingScaleFactor(screen) as f64;
+                let (width, height) = match attrs.inner_size {
+                    Some(size) => {
+                        let logical = size.to_logical(scale_factor);
+                        (logical.width, logical.height)
+                    }
+                    None => (800.0, 600.0),
+                };
                 NSRect::new(NSPoint::new(0.0, 0.0), NSSize::new(width, height))
             }
         };
@@ -292,6 +299,7 @@ pub struct UnownedWindow {
     pub shared_state: Arc<Mutex<SharedState>>,
     decorations: AtomicBool,
     cursor_state: Weak<Mutex<CursorState>>,
+    pub inner_rect: Option<PhysicalSize<u32>>,
 }
 
 unsafe impl Send for UnownedWindow {}
@@ -328,6 +336,8 @@ impl UnownedWindow {
 
         let input_context = unsafe { util::create_input_context(*ns_view) };
 
+        let dpi_factor = unsafe { NSWindow::backingScaleFactor(*ns_window) as f64 };
+
         unsafe {
             if win_attribs.transparent {
                 ns_window.setOpaque_(NO);
@@ -335,13 +345,14 @@ impl UnownedWindow {
             }
 
             ns_app.activateIgnoringOtherApps_(YES);
-
-            win_attribs
-                .min_inner_size
-                .map(|dim| set_min_inner_size(*ns_window, dim));
-            win_attribs
-                .max_inner_size
-                .map(|dim| set_max_inner_size(*ns_window, dim));
+            win_attribs.min_inner_size.map(|dim| {
+                let logical_dim = dim.to_logical(dpi_factor);
+                set_min_inner_size(*ns_window, logical_dim)
+            });
+            win_attribs.max_inner_size.map(|dim| {
+                let logical_dim = dim.to_logical(dpi_factor);
+                set_max_inner_size(*ns_window, logical_dim)
+            });
 
             use cocoa::foundation::NSArray;
             // register for drag and drop operations.
@@ -361,6 +372,9 @@ impl UnownedWindow {
         let maximized = win_attribs.maximized;
         let visible = win_attribs.visible;
         let decorations = win_attribs.decorations;
+        let inner_rect = win_attribs
+            .inner_size
+            .map(|size| size.to_physical(dpi_factor));
 
         let window = Arc::new(UnownedWindow {
             ns_view,
@@ -369,6 +383,7 @@ impl UnownedWindow {
             shared_state: Arc::new(Mutex::new(win_attribs.into())),
             decorations: AtomicBool::new(decorations),
             cursor_state,
+            inner_rect,
         });
 
         let delegate = new_delegate(&window, fullscreen.is_some());
@@ -425,27 +440,31 @@ impl UnownedWindow {
         AppState::queue_redraw(RootWindowId(self.id()));
     }
 
-    pub fn outer_position(&self) -> Result<LogicalPosition, NotSupportedError> {
+    pub fn outer_position(&self) -> Result<PhysicalPosition<i32>, NotSupportedError> {
         let frame_rect = unsafe { NSWindow::frame(*self.ns_window) };
-        Ok((
+        let position = LogicalPosition::new(
             frame_rect.origin.x as f64,
             util::bottom_left_to_top_left(frame_rect),
-        )
-            .into())
+        );
+        let dpi_factor = self.scale_factor();
+        Ok(position.to_physical(dpi_factor))
     }
 
-    pub fn inner_position(&self) -> Result<LogicalPosition, NotSupportedError> {
+    pub fn inner_position(&self) -> Result<PhysicalPosition<i32>, NotSupportedError> {
         let content_rect = unsafe {
             NSWindow::contentRectForFrameRect_(*self.ns_window, NSWindow::frame(*self.ns_window))
         };
-        Ok((
+        let position = LogicalPosition::new(
             content_rect.origin.x as f64,
             util::bottom_left_to_top_left(content_rect),
-        )
-            .into())
+        );
+        let dpi_factor = self.scale_factor();
+        Ok(position.to_physical(dpi_factor))
     }
 
-    pub fn set_outer_position(&self, position: LogicalPosition) {
+    pub fn set_outer_position(&self, position: Position) {
+        let dpi_factor = self.scale_factor();
+        let position = position.to_logical(dpi_factor);
         let dummy = NSRect::new(
             NSPoint::new(
                 position.x,
@@ -461,35 +480,50 @@ impl UnownedWindow {
     }
 
     #[inline]
-    pub fn inner_size(&self) -> LogicalSize {
+    pub fn inner_size(&self) -> PhysicalSize<u32> {
         let view_frame = unsafe { NSView::frame(*self.ns_view) };
-        (view_frame.size.width as f64, view_frame.size.height as f64).into()
+        let logical: LogicalSize<f64> =
+            (view_frame.size.width as f64, view_frame.size.height as f64).into();
+        let dpi_factor = self.scale_factor();
+        logical.to_physical(dpi_factor)
     }
 
     #[inline]
-    pub fn outer_size(&self) -> LogicalSize {
+    pub fn outer_size(&self) -> PhysicalSize<u32> {
         let view_frame = unsafe { NSWindow::frame(*self.ns_window) };
-        (view_frame.size.width as f64, view_frame.size.height as f64).into()
+        let logical: LogicalSize<f64> =
+            (view_frame.size.width as f64, view_frame.size.height as f64).into();
+        let dpi_factor = self.scale_factor();
+        logical.to_physical(dpi_factor)
     }
 
     #[inline]
-    pub fn set_inner_size(&self, size: LogicalSize) {
+    pub fn set_inner_size(&self, size: Size) {
         unsafe {
-            util::set_content_size_async(*self.ns_window, size);
+            let dpi_factor = self.scale_factor();
+            util::set_content_size_async(*self.ns_window, size.to_logical(dpi_factor));
         }
     }
 
-    pub fn set_min_inner_size(&self, dimensions: Option<LogicalSize>) {
+    pub fn set_min_inner_size(&self, dimensions: Option<Size>) {
         unsafe {
-            let dimensions = dimensions.unwrap_or_else(|| (0, 0).into());
-            set_min_inner_size(*self.ns_window, dimensions);
+            let dimensions = dimensions.unwrap_or(Logical(LogicalSize {
+                width: 0.0,
+                height: 0.0,
+            }));
+            let dpi_factor = self.scale_factor();
+            set_min_inner_size(*self.ns_window, dimensions.to_logical(dpi_factor));
         }
     }
 
-    pub fn set_max_inner_size(&self, dimensions: Option<LogicalSize>) {
+    pub fn set_max_inner_size(&self, dimensions: Option<Size>) {
         unsafe {
-            let dimensions = dimensions.unwrap_or_else(|| (!0, !0).into());
-            set_max_inner_size(*self.ns_window, dimensions);
+            let dimensions = dimensions.unwrap_or(Logical(LogicalSize {
+                width: std::f32::MAX as f64,
+                height: std::f32::MAX as f64,
+            }));
+            let dpi_factor = self.scale_factor();
+            set_max_inner_size(*self.ns_window, dimensions.to_logical(dpi_factor));
         }
     }
 
@@ -549,19 +583,19 @@ impl UnownedWindow {
     }
 
     #[inline]
-    pub fn hidpi_factor(&self) -> f64 {
+    pub fn scale_factor(&self) -> f64 {
         unsafe { NSWindow::backingScaleFactor(*self.ns_window) as _ }
     }
 
     #[inline]
-    pub fn set_cursor_position(
-        &self,
-        cursor_position: LogicalPosition,
-    ) -> Result<(), ExternalError> {
-        let window_position = self.inner_position().unwrap();
+    pub fn set_cursor_position(&self, cursor_position: Position) -> Result<(), ExternalError> {
+        let physical_window_position = self.inner_position().unwrap();
+        let dpi_factor = self.scale_factor();
+        let window_position = physical_window_position.to_logical::<CGFloat>(dpi_factor);
+        let logical_cursor_position = cursor_position.to_logical::<CGFloat>(dpi_factor);
         let point = appkit::CGPoint {
-            x: (cursor_position.x + window_position.x) as CGFloat,
-            y: (cursor_position.y + window_position.y) as CGFloat,
+            x: logical_cursor_position.x + window_position.x,
+            y: logical_cursor_position.y + window_position.y,
         };
         CGDisplay::warp_mouse_cursor_position(point)
             .map_err(|e| ExternalError::Os(os_error!(OsError::CGError(e))))?;
@@ -894,7 +928,9 @@ impl UnownedWindow {
     }
 
     #[inline]
-    pub fn set_ime_position(&self, logical_spot: LogicalPosition) {
+    pub fn set_ime_position(&self, spot: Position) {
+        let dpi_factor = self.scale_factor();
+        let logical_spot = spot.to_logical(dpi_factor);
         unsafe {
             view::set_ime_position(
                 *self.ns_view,
@@ -1059,7 +1095,7 @@ impl Drop for UnownedWindow {
     }
 }
 
-unsafe fn set_min_inner_size<V: NSWindow + Copy>(window: V, mut min_size: LogicalSize) {
+unsafe fn set_min_inner_size<V: NSWindow + Copy>(window: V, mut min_size: LogicalSize<f64>) {
     let mut current_rect = NSWindow::frame(window);
     let content_rect = NSWindow::contentRectForFrameRect_(window, NSWindow::frame(window));
     // Convert from client area size to window size
@@ -1083,7 +1119,7 @@ unsafe fn set_min_inner_size<V: NSWindow + Copy>(window: V, mut min_size: Logica
     }
 }
 
-unsafe fn set_max_inner_size<V: NSWindow + Copy>(window: V, mut max_size: LogicalSize) {
+unsafe fn set_max_inner_size<V: NSWindow + Copy>(window: V, mut max_size: LogicalSize<f64>) {
     let mut current_rect = NSWindow::frame(window);
     let content_rect = NSWindow::contentRectForFrameRect_(window, NSWindow::frame(window));
     // Convert from client area size to window size

src/platform_impl/macos/window_delegate.rs

@@ -19,6 +19,7 @@ use crate::{
     event::{Event, WindowEvent},
     platform_impl::platform::{
         app_state::AppState,
+        event::{EventProxy, EventWrapper},
         util::{self, IdRef},
         window::{get_window_id, UnownedWindow},
     },
@@ -47,20 +48,18 @@ pub struct WindowDelegateState {
 
 impl WindowDelegateState {
     pub fn new(window: &Arc<UnownedWindow>, initial_fullscreen: bool) -> Self {
-        let dpi_factor = window.hidpi_factor();
-
+        let scale_factor = window.scale_factor();
         let mut delegate_state = WindowDelegateState {
             ns_window: window.ns_window.clone(),
             ns_view: window.ns_view.clone(),
             window: Arc::downgrade(&window),
             initial_fullscreen,
             previous_position: None,
-            previous_dpi_factor: dpi_factor,
+            previous_dpi_factor: scale_factor,
         };
 
-        if dpi_factor != 1.0 {
-            delegate_state.emit_event(WindowEvent::HiDpiFactorChanged(dpi_factor));
-            delegate_state.emit_resize_event();
+        if scale_factor != 1.0 {
+            delegate_state.emit_static_scale_factor_changed_event();
         }
 
         delegate_state
@@ -73,17 +72,34 @@ impl WindowDelegateState {
         self.window.upgrade().map(|ref window| callback(window))
     }
 
-    pub fn emit_event(&mut self, event: WindowEvent) {
+    pub fn emit_event(&mut self, event: WindowEvent<'static>) {
         let event = Event::WindowEvent {
             window_id: WindowId(get_window_id(*self.ns_window)),
             event,
         };
-        AppState::queue_event(event);
+        AppState::queue_event(EventWrapper::StaticEvent(event));
+    }
+
+    pub fn emit_static_scale_factor_changed_event(&mut self) {
+        let scale_factor = self.get_scale_factor();
+        if scale_factor == self.previous_dpi_factor {
+            return ();
+        };
+
+        self.previous_dpi_factor = scale_factor;
+        let wrapper = EventWrapper::EventProxy(EventProxy::DpiChangedProxy {
+            ns_window: IdRef::retain(*self.ns_window),
+            suggested_size: self.view_size(),
+            scale_factor,
+        });
+        AppState::queue_event(wrapper);
     }
 
     pub fn emit_resize_event(&mut self) {
         let rect = unsafe { NSView::frame(*self.ns_view) };
-        let size = LogicalSize::new(rect.size.width as f64, rect.size.height as f64);
+        let scale_factor = self.get_scale_factor();
+        let logical_size = LogicalSize::new(rect.size.width as f64, rect.size.height as f64);
+        let size = logical_size.to_physical(scale_factor);
         self.emit_event(WindowEvent::Resized(size));
     }
 
@@ -97,6 +113,15 @@ impl WindowDelegateState {
             self.emit_event(WindowEvent::Moved((x, y).into()));
         }
     }
+
+    fn get_scale_factor(&self) -> f64 {
+        (unsafe { NSWindow::backingScaleFactor(*self.ns_window) }) as f64
+    }
+
+    fn view_size(&self) -> LogicalSize<f64> {
+        let ns_size = unsafe { NSView::frame(*self.ns_view).size };
+        LogicalSize::new(ns_size.width as f64, ns_size.height as f64)
+    }
 }
 
 pub fn new_delegate(window: &Arc<UnownedWindow>, initial_fullscreen: bool) -> IdRef {
@@ -140,10 +165,6 @@ lazy_static! {
             sel!(windowDidMove:),
             window_did_move as extern "C" fn(&Object, Sel, id),
         );
-        decl.add_method(
-            sel!(windowDidChangeScreen:),
-            window_did_change_screen as extern "C" fn(&Object, Sel, id),
-        );
         decl.add_method(
             sel!(windowDidChangeBackingProperties:),
             window_did_change_backing_properties as extern "C" fn(&Object, Sel, id),
@@ -277,29 +298,10 @@ extern "C" fn window_did_move(this: &Object, _: Sel, _: id) {
     trace!("Completed `windowDidMove:`");
 }
 
-extern "C" fn window_did_change_screen(this: &Object, _: Sel, _: id) {
-    trace!("Triggered `windowDidChangeScreen:`");
-    with_state(this, |state| {
-        let dpi_factor = unsafe { NSWindow::backingScaleFactor(*state.ns_window) } as f64;
-        if state.previous_dpi_factor != dpi_factor {
-            state.previous_dpi_factor = dpi_factor;
-            state.emit_event(WindowEvent::HiDpiFactorChanged(dpi_factor));
-            state.emit_resize_event();
-        }
-    });
-    trace!("Completed `windowDidChangeScreen:`");
-}
-
-// This will always be called before `window_did_change_screen`.
 extern "C" fn window_did_change_backing_properties(this: &Object, _: Sel, _: id) {
     trace!("Triggered `windowDidChangeBackingProperties:`");
     with_state(this, |state| {
-        let dpi_factor = unsafe { NSWindow::backingScaleFactor(*state.ns_window) } as f64;
-        if state.previous_dpi_factor != dpi_factor {
-            state.previous_dpi_factor = dpi_factor;
-            state.emit_event(WindowEvent::HiDpiFactorChanged(dpi_factor));
-            state.emit_resize_event();
-        }
+        state.emit_static_scale_factor_changed_event();
     });
     trace!("Completed `windowDidChangeBackingProperties:`");
 }

src/platform_impl/web/event_loop/mod.rs

@@ -37,7 +37,8 @@ impl<T> EventLoop<T> {
 
     pub fn run<F>(self, mut event_handler: F) -> !
     where
-        F: 'static + FnMut(Event<T>, &root::EventLoopWindowTarget<T>, &mut root::ControlFlow),
+        F: 'static
+            + FnMut(Event<'static, T>, &root::EventLoopWindowTarget<T>, &mut root::ControlFlow),
     {
         let target = root::EventLoopWindowTarget {
             p: self.elw.p.clone(),

src/platform_impl/web/event_loop/runner.rs

@@ -11,7 +11,7 @@ use std::{
     rc::Rc,
 };
 
-pub struct Shared<T>(Rc<Execution<T>>);
+pub struct Shared<T: 'static>(Rc<Execution<T>>);
 
 impl<T> Clone for Shared<T> {
     fn clone(&self) -> Self {
@@ -19,21 +19,21 @@ impl<T> Clone for Shared<T> {
     }
 }
 
-pub struct Execution<T> {
+pub struct Execution<T: 'static> {
     runner: RefCell<Option<Runner<T>>>,
-    events: RefCell<VecDeque<Event<T>>>,
+    events: RefCell<VecDeque<Event<'static, T>>>,
     id: RefCell<u32>,
     redraw_pending: RefCell<HashSet<WindowId>>,
 }
 
-struct Runner<T> {
+struct Runner<T: 'static> {
     state: State,
     is_busy: bool,
-    event_handler: Box<dyn FnMut(Event<T>, &mut root::ControlFlow)>,
+    event_handler: Box<dyn FnMut(Event<'static, T>, &mut root::ControlFlow)>,
 }
 
 impl<T: 'static> Runner<T> {
-    pub fn new(event_handler: Box<dyn FnMut(Event<T>, &mut root::ControlFlow)>) -> Self {
+    pub fn new(event_handler: Box<dyn FnMut(Event<'static, T>, &mut root::ControlFlow)>) -> Self {
         Runner {
             state: State::Init,
             is_busy: false,
@@ -55,7 +55,10 @@ impl<T: 'static> Shared<T> {
     // Set the event callback to use for the event loop runner
     // This the event callback is a fairly thin layer over the user-provided callback that closes
     // over a RootEventLoopWindowTarget reference
-    pub fn set_listener(&self, event_handler: Box<dyn FnMut(Event<T>, &mut root::ControlFlow)>) {
+    pub fn set_listener(
+        &self,
+        event_handler: Box<dyn FnMut(Event<'static, T>, &mut root::ControlFlow)>,
+    ) {
         self.0.runner.replace(Some(Runner::new(event_handler)));
         self.send_event(Event::NewEvents(StartCause::Init));
 
@@ -79,7 +82,7 @@ impl<T: 'static> Shared<T> {
     // Add an event to the event loop runner
     //
     // It will determine if the event should be immediately sent to the user or buffered for later
-    pub fn send_event(&self, event: Event<T>) {
+    pub fn send_event(&self, event: Event<'static, T>) {
         // If the event loop is closed, it should discard any new events
         if self.is_closed() {
             return;
@@ -153,7 +156,7 @@ impl<T: 'static> Shared<T> {
     // handle_event takes in events and either queues them or applies a callback
     //
     // It should only ever be called from send_event
-    fn handle_event(&self, event: Event<T>, control: &mut root::ControlFlow) {
+    fn handle_event(&self, event: Event<'static, T>, control: &mut root::ControlFlow) {
         let is_closed = self.is_closed();
 
         match *self.0.runner.borrow_mut() {

src/platform_impl/web/event_loop/window_target.rs

@@ -1,5 +1,5 @@
 use super::{backend, device, proxy::Proxy, runner, window};
-use crate::dpi::LogicalSize;
+use crate::dpi::{PhysicalSize, Size};
 use crate::event::{DeviceId, ElementState, Event, KeyboardInput, TouchPhase, WindowEvent};
 use crate::event_loop::ControlFlow;
 use crate::window::WindowId;
@@ -28,7 +28,7 @@ impl<T> WindowTarget<T> {
         Proxy::new(self.runner.clone())
     }
 
-    pub fn run(&self, event_handler: Box<dyn FnMut(Event<T>, &mut ControlFlow)>) {
+    pub fn run(&self, event_handler: Box<dyn FnMut(Event<'static, T>, &mut ControlFlow)>) {
         self.runner.set_listener(event_handler);
     }
 
@@ -170,25 +170,27 @@ impl<T> WindowTarget<T> {
 
         let runner = self.runner.clone();
         let raw = canvas.raw().clone();
-        let mut intended_size = LogicalSize {
-            width: raw.width() as f64,
-            height: raw.height() as f64,
+
+        // The size to restore to after exiting fullscreen.
+        let mut intended_size = PhysicalSize {
+            width: raw.width() as u32,
+            height: raw.height() as u32,
         };
         canvas.on_fullscreen_change(move || {
             // If the canvas is marked as fullscreen, it is moving *into* fullscreen
             // If it is not, it is moving *out of* fullscreen
             let new_size = if backend::is_fullscreen(&raw) {
-                intended_size = LogicalSize {
-                    width: raw.width() as f64,
-                    height: raw.height() as f64,
+                intended_size = PhysicalSize {
+                    width: raw.width() as u32,
+                    height: raw.height() as u32,
                 };
 
-                backend::window_size()
+                backend::window_size().to_physical(backend::scale_factor())
             } else {
                 intended_size
             };
-            raw.set_width(new_size.width as u32);
-            raw.set_height(new_size.height as u32);
+
+            backend::set_canvas_size(&raw, Size::Physical(new_size));
             runner.send_event(Event::WindowEvent {
                 window_id: WindowId(id),
                 event: WindowEvent::Resized(new_size),

src/platform_impl/web/monitor.rs

@@ -5,22 +5,22 @@ use crate::monitor::{MonitorHandle, VideoMode};
 pub struct Handle;
 
 impl Handle {
-    pub fn hidpi_factor(&self) -> f64 {
+    pub fn scale_factor(&self) -> f64 {
         1.0
     }
 
-    pub fn position(&self) -> PhysicalPosition {
-        PhysicalPosition { x: 0.0, y: 0.0 }
+    pub fn position(&self) -> PhysicalPosition<i32> {
+        PhysicalPosition { x: 0, y: 0 }
     }
 
     pub fn name(&self) -> Option<String> {
         None
     }
 
-    pub fn size(&self) -> PhysicalSize {
+    pub fn size(&self) -> PhysicalSize<u32> {
         PhysicalSize {
-            width: 0.0,
-            height: 0.0,
+            width: 0,
+            height: 0,
         }
     }
 
@@ -33,7 +33,7 @@ impl Handle {
 pub struct Mode;
 
 impl Mode {
-    pub fn size(&self) -> PhysicalSize {
+    pub fn size(&self) -> PhysicalSize<u32> {
         unimplemented!();
     }
 

src/platform_impl/web/stdweb/canvas.rs

@@ -1,5 +1,5 @@
 use super::event;
-use crate::dpi::{LogicalPosition, LogicalSize};
+use crate::dpi::{LogicalPosition, PhysicalPosition, PhysicalSize};
 use crate::error::OsError as RootOE;
 use crate::event::{ModifiersState, MouseButton, MouseScrollDelta, ScanCode, VirtualKeyCode};
 use crate::platform_impl::OsError;
@@ -19,6 +19,7 @@ use stdweb::web::{
 };
 
 pub struct Canvas {
+    /// Note: resizing the CanvasElement should go through `backend::set_canvas_size` to ensure the DPI factor is maintained.
     raw: CanvasElement,
     on_focus: Option<EventListenerHandle>,
     on_blur: Option<EventListenerHandle>,
@@ -82,23 +83,20 @@ impl Canvas {
             .expect(&format!("Set attribute: {}", attribute));
     }
 
-    pub fn position(&self) -> (f64, f64) {
+    pub fn position(&self) -> LogicalPosition<f64> {
         let bounds = self.raw.get_bounding_client_rect();
 
-        (bounds.get_x(), bounds.get_y())
+        LogicalPosition {
+            x: bounds.get_x(),
+            y: bounds.get_y(),
+        }
     }
 
-    pub fn width(&self) -> f64 {
-        self.raw.width() as f64
-    }
-
-    pub fn height(&self) -> f64 {
-        self.raw.height() as f64
-    }
-
-    pub fn set_size(&self, size: LogicalSize) {
-        self.raw.set_width(size.width as u32);
-        self.raw.set_height(size.height as u32);
+    pub fn size(&self) -> PhysicalSize<u32> {
+        PhysicalSize {
+            width: self.raw.width() as u32,
+            height: self.raw.height() as u32,
+        }
     }
 
     pub fn raw(&self) -> &CanvasElement {
@@ -209,12 +207,13 @@ impl Canvas {
 
     pub fn on_cursor_move<F>(&mut self, mut handler: F)
     where
-        F: 'static + FnMut(i32, LogicalPosition, ModifiersState),
+        F: 'static + FnMut(i32, PhysicalPosition<i32>, ModifiersState),
     {
+        // todo
         self.on_cursor_move = Some(self.add_event(move |event: PointerMoveEvent| {
             handler(
                 event.pointer_id(),
-                event::mouse_position(&event),
+                event::mouse_position(&event).to_physical(super::scale_factor()),
                 event::mouse_modifiers(&event),
             );
         }));

src/platform_impl/web/stdweb/event.rs

@@ -23,7 +23,7 @@ pub fn mouse_modifiers(event: &impl IMouseEvent) -> ModifiersState {
     m
 }
 
-pub fn mouse_position(event: &impl IMouseEvent) -> LogicalPosition {
+pub fn mouse_position(event: &impl IMouseEvent) -> LogicalPosition<f64> {
     LogicalPosition {
         x: event.offset_x() as f64,
         y: event.offset_y() as f64,

src/platform_impl/web/stdweb/mod.rs

@@ -5,7 +5,7 @@ mod timeout;
 pub use self::canvas::Canvas;
 pub use self::timeout::Timeout;
 
-use crate::dpi::LogicalSize;
+use crate::dpi::{LogicalSize, Size};
 use crate::platform::web::WindowExtStdweb;
 use crate::window::Window;
 
@@ -33,7 +33,7 @@ impl WindowExtStdweb for Window {
     }
 }
 
-pub fn window_size() -> LogicalSize {
+pub fn window_size() -> LogicalSize<f64> {
     let window = window();
     let width = window.inner_width() as f64;
     let height = window.inner_height() as f64;
@@ -41,6 +41,28 @@ pub fn window_size() -> LogicalSize {
     LogicalSize { width, height }
 }
 
+pub fn scale_factor() -> f64 {
+    let window = window();
+    window.device_pixel_ratio()
+}
+
+pub fn set_canvas_size(raw: &CanvasElement, size: Size) {
+    use stdweb::*;
+
+    let scale_factor = scale_factor();
+
+    let physical_size = size.to_physical::<u32>(scale_factor);
+    let logical_size = size.to_logical::<f64>(scale_factor);
+
+    raw.set_width(physical_size.width);
+    raw.set_height(physical_size.height);
+
+    js! {
+        @{raw.as_ref()}.style.width = @{logical_size.width} + "px";
+        @{raw.as_ref()}.style.height = @{logical_size.height} + "px";
+    }
+}
+
 pub fn is_fullscreen(canvas: &CanvasElement) -> bool {
     match document().fullscreen_element() {
         Some(elem) => {

src/platform_impl/web/web_sys/canvas.rs

@@ -1,5 +1,5 @@
 use super::event;
-use crate::dpi::{LogicalPosition, LogicalSize};
+use crate::dpi::{LogicalPosition, PhysicalPosition, PhysicalSize};
 use crate::error::OsError as RootOE;
 use crate::event::{ModifiersState, MouseButton, MouseScrollDelta, ScanCode, VirtualKeyCode};
 use crate::platform_impl::OsError;
@@ -11,6 +11,7 @@ use wasm_bindgen::{closure::Closure, JsCast};
 use web_sys::{Event, FocusEvent, HtmlCanvasElement, KeyboardEvent, PointerEvent, WheelEvent};
 
 pub struct Canvas {
+    /// Note: resizing the HTMLCanvasElement should go through `backend::set_canvas_size` to ensure the DPI factor is maintained.
     raw: HtmlCanvasElement,
     on_focus: Option<Closure<dyn FnMut(FocusEvent)>>,
     on_blur: Option<Closure<dyn FnMut(FocusEvent)>>,
@@ -80,23 +81,20 @@ impl Canvas {
             .expect(&format!("Set attribute: {}", attribute));
     }
 
-    pub fn position(&self) -> (f64, f64) {
+    pub fn position(&self) -> LogicalPosition<f64> {
         let bounds = self.raw.get_bounding_client_rect();
 
-        (bounds.x(), bounds.y())
+        LogicalPosition {
+            x: bounds.x(),
+            y: bounds.y(),
+        }
     }
 
-    pub fn width(&self) -> f64 {
-        self.raw.width() as f64
-    }
-
-    pub fn height(&self) -> f64 {
-        self.raw.height() as f64
-    }
-
-    pub fn set_size(&self, size: LogicalSize) {
-        self.raw.set_width(size.width as u32);
-        self.raw.set_height(size.height as u32);
+    pub fn size(&self) -> PhysicalSize<u32> {
+        PhysicalSize {
+            width: self.raw.width(),
+            height: self.raw.height(),
+        }
     }
 
     pub fn raw(&self) -> &HtmlCanvasElement {
@@ -218,12 +216,12 @@ impl Canvas {
 
     pub fn on_cursor_move<F>(&mut self, mut handler: F)
     where
-        F: 'static + FnMut(i32, LogicalPosition, ModifiersState),
+        F: 'static + FnMut(i32, PhysicalPosition<i32>, ModifiersState),
     {
         self.on_cursor_move = Some(self.add_event("pointermove", move |event: PointerEvent| {
             handler(
                 event.pointer_id(),
-                event::mouse_position(&event),
+                event::mouse_position(&event).to_physical(super::scale_factor()),
                 event::mouse_modifiers(&event),
             );
         }));

src/platform_impl/web/web_sys/event.rs

@@ -22,7 +22,7 @@ pub fn mouse_modifiers(event: &MouseEvent) -> ModifiersState {
     m
 }
 
-pub fn mouse_position(event: &MouseEvent) -> LogicalPosition {
+pub fn mouse_position(event: &MouseEvent) -> LogicalPosition<f64> {
     LogicalPosition {
         x: event.offset_x() as f64,
         y: event.offset_y() as f64,

src/platform_impl/web/web_sys/mod.rs

@@ -5,7 +5,7 @@ mod timeout;
 pub use self::canvas::Canvas;
 pub use self::timeout::Timeout;
 
-use crate::dpi::LogicalSize;
+use crate::dpi::{LogicalSize, Size};
 use crate::platform::web::WindowExtWebSys;
 use crate::window::Window;
 use wasm_bindgen::{closure::Closure, JsCast};
@@ -40,7 +40,7 @@ impl WindowExtWebSys for Window {
     }
 }
 
-pub fn window_size() -> LogicalSize {
+pub fn window_size() -> LogicalSize<f64> {
     let window = web_sys::window().expect("Failed to obtain window");
     let width = window
         .inner_width()
@@ -56,6 +56,29 @@ pub fn window_size() -> LogicalSize {
     LogicalSize { width, height }
 }
 
+pub fn scale_factor() -> f64 {
+    let window = web_sys::window().expect("Failed to obtain window");
+    window.device_pixel_ratio()
+}
+
+pub fn set_canvas_size(raw: &HtmlCanvasElement, size: Size) {
+    let scale_factor = scale_factor();
+
+    let physical_size = size.to_physical::<u32>(scale_factor);
+    let logical_size = size.to_logical::<f64>(scale_factor);
+
+    raw.set_width(physical_size.width);
+    raw.set_height(physical_size.height);
+
+    let style = raw.style();
+    style
+        .set_property("width", &format!("{}px", logical_size.width))
+        .expect("Failed to set canvas width");
+    style
+        .set_property("height", &format!("{}px", logical_size.height))
+        .expect("Failed to set canvas height");
+}
+
 pub fn is_fullscreen(canvas: &HtmlCanvasElement) -> bool {
     let window = window().expect("Failed to obtain window");
     let document = window.document().expect("Failed to obtain document");

src/platform_impl/web/window.rs

@@ -1,4 +1,4 @@
-use crate::dpi::{LogicalPosition, LogicalSize};
+use crate::dpi::{LogicalSize, PhysicalPosition, PhysicalSize, Position, Size};
 use crate::error::{ExternalError, NotSupportedError, OsError as RootOE};
 use crate::icon::Icon;
 use crate::monitor::MonitorHandle as RootMH;
@@ -15,7 +15,6 @@ use std::collections::VecDeque;
 pub struct Window {
     canvas: backend::Canvas,
     previous_pointer: RefCell<&'static str>,
-    position: RefCell<LogicalPosition>,
     id: Id,
     register_redraw_request: Box<dyn Fn()>,
 }
@@ -39,15 +38,14 @@ impl Window {
         let window = Window {
             canvas,
             previous_pointer: RefCell::new("auto"),
-            position: RefCell::new(LogicalPosition { x: 0.0, y: 0.0 }),
             id,
             register_redraw_request,
         };
 
-        window.set_inner_size(attr.inner_size.unwrap_or(LogicalSize {
+        window.set_inner_size(attr.inner_size.unwrap_or(Size::Logical(LogicalSize {
             width: 1024.0,
             height: 768.0,
-        }));
+        })));
         window.set_title(&attr.title);
         window.set_maximized(attr.maximized);
         window.set_visible(attr.visible);
@@ -72,18 +70,17 @@ impl Window {
         (self.register_redraw_request)();
     }
 
-    pub fn outer_position(&self) -> Result<LogicalPosition, NotSupportedError> {
-        let (x, y) = self.canvas.position();
-
-        Ok(LogicalPosition { x, y })
+    pub fn outer_position(&self) -> Result<PhysicalPosition<i32>, NotSupportedError> {
+        Ok(self.canvas.position().to_physical(self.scale_factor()))
     }
 
-    pub fn inner_position(&self) -> Result<LogicalPosition, NotSupportedError> {
-        Ok(*self.position.borrow())
+    pub fn inner_position(&self) -> Result<PhysicalPosition<i32>, NotSupportedError> {
+        // Note: the canvas element has no window decorations, so this is equal to `outer_position`.
+        self.outer_position()
     }
 
-    pub fn set_outer_position(&self, position: LogicalPosition) {
-        *self.position.borrow_mut() = position;
+    pub fn set_outer_position(&self, position: Position) {
+        let position = position.to_logical::<f64>(self.scale_factor());
 
         self.canvas.set_attribute("position", "fixed");
         self.canvas.set_attribute("left", &position.x.to_string());
@@ -91,33 +88,28 @@ impl Window {
     }
 
     #[inline]
-    pub fn inner_size(&self) -> LogicalSize {
-        LogicalSize {
-            width: self.canvas.width() as f64,
-            height: self.canvas.height() as f64,
-        }
+    pub fn inner_size(&self) -> PhysicalSize<u32> {
+        self.canvas.size()
     }
 
     #[inline]
-    pub fn outer_size(&self) -> LogicalSize {
-        LogicalSize {
-            width: self.canvas.width() as f64,
-            height: self.canvas.height() as f64,
-        }
+    pub fn outer_size(&self) -> PhysicalSize<u32> {
+        // Note: the canvas element has no window decorations, so this is equal to `inner_size`.
+        self.inner_size()
     }
 
     #[inline]
-    pub fn set_inner_size(&self, size: LogicalSize) {
-        self.canvas.set_size(size);
+    pub fn set_inner_size(&self, size: Size) {
+        backend::set_canvas_size(self.canvas.raw(), size);
     }
 
     #[inline]
-    pub fn set_min_inner_size(&self, _dimensions: Option<LogicalSize>) {
+    pub fn set_min_inner_size(&self, _dimensions: Option<Size>) {
         // Intentionally a no-op: users can't resize canvas elements
     }
 
     #[inline]
-    pub fn set_max_inner_size(&self, _dimensions: Option<LogicalSize>) {
+    pub fn set_max_inner_size(&self, _dimensions: Option<Size>) {
         // Intentionally a no-op: users can't resize canvas elements
     }
 
@@ -127,8 +119,8 @@ impl Window {
     }
 
     #[inline]
-    pub fn hidpi_factor(&self) -> f64 {
-        1.0
+    pub fn scale_factor(&self) -> f64 {
+        super::backend::scale_factor()
     }
 
     #[inline]
@@ -178,7 +170,7 @@ impl Window {
     }
 
     #[inline]
-    pub fn set_cursor_position(&self, _position: LogicalPosition) -> Result<(), ExternalError> {
+    pub fn set_cursor_position(&self, _position: Position) -> Result<(), ExternalError> {
         // Intentionally a no-op, as the web does not support setting cursor positions
         Ok(())
     }
@@ -243,7 +235,7 @@ impl Window {
     }
 
     #[inline]
-    pub fn set_ime_position(&self, _position: LogicalPosition) {
+    pub fn set_ime_position(&self, _position: Position) {
         // Currently a no-op as it does not seem there is good support for this on web
     }
 

src/platform_impl/windows/dpi.rs

@@ -2,54 +2,30 @@
 
 use std::sync::Once;
 
+use crate::platform_impl::platform::util::{
+    ENABLE_NON_CLIENT_DPI_SCALING, GET_DPI_FOR_MONITOR, GET_DPI_FOR_WINDOW, SET_PROCESS_DPI_AWARE,
+    SET_PROCESS_DPI_AWARENESS, SET_PROCESS_DPI_AWARENESS_CONTEXT,
+};
 use winapi::{
     shared::{
-        minwindef::{BOOL, FALSE, UINT},
+        minwindef::FALSE,
         windef::{DPI_AWARENESS_CONTEXT, DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE, HMONITOR, HWND},
         winerror::S_OK,
     },
     um::{
-        shellscalingapi::{
-            MDT_EFFECTIVE_DPI, MONITOR_DPI_TYPE, PROCESS_DPI_AWARENESS,
-            PROCESS_PER_MONITOR_DPI_AWARE,
-        },
+        shellscalingapi::{MDT_EFFECTIVE_DPI, PROCESS_PER_MONITOR_DPI_AWARE},
         wingdi::{GetDeviceCaps, LOGPIXELSX},
-        winnt::HRESULT,
         winuser::{self, MONITOR_DEFAULTTONEAREST},
     },
 };
 
 const DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2: DPI_AWARENESS_CONTEXT = -4isize as _;
 
-type SetProcessDPIAware = unsafe extern "system" fn() -> BOOL;
-type SetProcessDpiAwareness = unsafe extern "system" fn(value: PROCESS_DPI_AWARENESS) -> HRESULT;
-type SetProcessDpiAwarenessContext =
-    unsafe extern "system" fn(value: DPI_AWARENESS_CONTEXT) -> BOOL;
-type GetDpiForWindow = unsafe extern "system" fn(hwnd: HWND) -> UINT;
-type GetDpiForMonitor = unsafe extern "system" fn(
-    hmonitor: HMONITOR,
-    dpi_type: MONITOR_DPI_TYPE,
-    dpi_x: *mut UINT,
-    dpi_y: *mut UINT,
-) -> HRESULT;
-type EnableNonClientDpiScaling = unsafe extern "system" fn(hwnd: HWND) -> BOOL;
-
-lazy_static! {
-    static ref GET_DPI_FOR_WINDOW: Option<GetDpiForWindow> =
-        get_function!("user32.dll", GetDpiForWindow);
-    static ref GET_DPI_FOR_MONITOR: Option<GetDpiForMonitor> =
-        get_function!("shcore.dll", GetDpiForMonitor);
-    static ref ENABLE_NON_CLIENT_DPI_SCALING: Option<EnableNonClientDpiScaling> =
-        get_function!("user32.dll", EnableNonClientDpiScaling);
-}
-
 pub fn become_dpi_aware() {
     static ENABLE_DPI_AWARENESS: Once = Once::new();
     ENABLE_DPI_AWARENESS.call_once(|| {
         unsafe {
-            if let Some(SetProcessDpiAwarenessContext) =
-                get_function!("user32.dll", SetProcessDpiAwarenessContext)
-            {
+            if let Some(SetProcessDpiAwarenessContext) = *SET_PROCESS_DPI_AWARENESS_CONTEXT {
                 // We are on Windows 10 Anniversary Update (1607) or later.
                 if SetProcessDpiAwarenessContext(DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2)
                     == FALSE
@@ -58,13 +34,10 @@ pub fn become_dpi_aware() {
                     // V1 if we can't set V2.
                     SetProcessDpiAwarenessContext(DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE);
                 }
-            } else if let Some(SetProcessDpiAwareness) =
-                get_function!("shcore.dll", SetProcessDpiAwareness)
-            {
+            } else if let Some(SetProcessDpiAwareness) = *SET_PROCESS_DPI_AWARENESS {
                 // We are on Windows 8.1 or later.
                 SetProcessDpiAwareness(PROCESS_PER_MONITOR_DPI_AWARE);
-            } else if let Some(SetProcessDPIAware) = get_function!("user32.dll", SetProcessDPIAware)
-            {
+            } else if let Some(SetProcessDPIAware) = *SET_PROCESS_DPI_AWARE {
                 // We are on Vista or later.
                 SetProcessDPIAware();
             }
@@ -141,7 +114,3 @@ pub unsafe fn hwnd_dpi(hwnd: HWND) -> u32 {
         }
     }
 }
-
-pub fn hwnd_scale_factor(hwnd: HWND) -> f64 {
-    dpi_to_scale_factor(unsafe { hwnd_dpi(hwnd) })
-}

src/platform_impl/windows/drop_handler.rs

@@ -31,7 +31,7 @@ pub struct FileDropHandlerData {
     pub interface: IDropTarget,
     refcount: AtomicUsize,
     window: HWND,
-    send_event: Box<dyn Fn(Event<()>)>,
+    send_event: Box<dyn Fn(Event<'static, ()>)>,
     cursor_effect: DWORD,
     hovered_is_valid: bool, /* If the currently hovered item is not valid there must not be any `HoveredFileCancelled` emitted */
 }
@@ -42,7 +42,7 @@ pub struct FileDropHandler {
 
 #[allow(non_snake_case)]
 impl FileDropHandler {
-    pub fn new(window: HWND, send_event: Box<dyn Fn(Event<()>)>) -> FileDropHandler {
+    pub fn new(window: HWND, send_event: Box<dyn Fn(Event<'static, ()>)>) -> FileDropHandler {
         let data = Box::new(FileDropHandlerData {
             interface: IDropTarget {
                 lpVtbl: &DROP_TARGET_VTBL as *const IDropTargetVtbl,
@@ -227,7 +227,7 @@ impl FileDropHandler {
 }
 
 impl FileDropHandlerData {
-    fn send_event(&self, event: Event<()>) {
+    fn send_event(&self, event: Event<'static, ()>) {
         (self.send_event)(event);
     }
 }

src/platform_impl/windows/event_loop.rs

@@ -29,7 +29,6 @@ use std::{
 use winapi::shared::basetsd::{DWORD_PTR, UINT_PTR};
 
 use winapi::{
-    ctypes::c_int,
     shared::{
         minwindef::{BOOL, DWORD, HIWORD, INT, LOWORD, LPARAM, LRESULT, UINT, WPARAM},
         windef::{HWND, POINT, RECT},
@@ -44,20 +43,17 @@ use winapi::{
 
 use self::runner::{ELRShared, EventLoopRunnerShared};
 use crate::{
-    dpi::{LogicalPosition, LogicalSize, PhysicalSize},
+    dpi::{PhysicalPosition, PhysicalSize},
     event::{DeviceEvent, Event, Force, KeyboardInput, Touch, TouchPhase, WindowEvent},
     event_loop::{ControlFlow, EventLoopClosed, EventLoopWindowTarget as RootELW},
     platform_impl::platform::{
         dark_mode::try_dark_mode,
-        dpi::{
-            become_dpi_aware, dpi_to_scale_factor, enable_non_client_dpi_scaling, hwnd_scale_factor,
-        },
+        dpi::{become_dpi_aware, dpi_to_scale_factor, enable_non_client_dpi_scaling},
         drop_handler::FileDropHandler,
         event::{
             self, handle_extended_keys, process_key_params, vkey_to_winit_vkey, ModifiersStateSide,
         },
         monitor, raw_input, util,
-        window::adjust_size,
         window_state::{CursorFlags, WindowFlags, WindowState},
         wrap_device_id, WindowId, DEVICE_ID,
     },
@@ -97,26 +93,30 @@ lazy_static! {
         get_function!("user32.dll", GetPointerPenInfo);
 }
 
-pub(crate) struct SubclassInput<T> {
+pub(crate) struct SubclassInput<T: 'static> {
     pub window_state: Arc<Mutex<WindowState>>,
     pub event_loop_runner: EventLoopRunnerShared<T>,
     pub file_drop_handler: FileDropHandler,
 }
 
 impl<T> SubclassInput<T> {
-    unsafe fn send_event(&self, event: Event<T>) {
+    unsafe fn send_event(&self, event: Event<'static, T>) {
         self.event_loop_runner.send_event(event);
     }
+
+    unsafe fn send_event_unbuffered<'e>(&self, event: Event<'e, T>) -> Result<(), Event<'e, T>> {
+        self.event_loop_runner.send_event_unbuffered(event)
+    }
 }
 
-struct ThreadMsgTargetSubclassInput<T> {
+struct ThreadMsgTargetSubclassInput<T: 'static> {
     event_loop_runner: EventLoopRunnerShared<T>,
     user_event_receiver: Receiver<T>,
     modifiers_state: ModifiersStateSide,
 }
 
 impl<T> ThreadMsgTargetSubclassInput<T> {
-    unsafe fn send_event(&self, event: Event<T>) {
+    unsafe fn send_event(&self, event: Event<'static, T>) {
         self.event_loop_runner.send_event(event);
     }
 }
@@ -126,7 +126,7 @@ pub struct EventLoop<T: 'static> {
     window_target: RootELW<T>,
 }
 
-pub struct EventLoopWindowTarget<T> {
+pub struct EventLoopWindowTarget<T: 'static> {
     thread_id: DWORD,
     thread_msg_target: HWND,
     pub(crate) runner_shared: EventLoopRunnerShared<T>,
@@ -191,7 +191,7 @@ impl<T: 'static> EventLoop<T> {
 
     pub fn run<F>(mut self, event_handler: F) -> !
     where
-        F: 'static + FnMut(Event<T>, &RootELW<T>, &mut ControlFlow),
+        F: 'static + FnMut(Event<'_, T>, &RootELW<T>, &mut ControlFlow),
     {
         self.run_return(event_handler);
         ::std::process::exit(0);
@@ -199,7 +199,7 @@ impl<T: 'static> EventLoop<T> {
 
     pub fn run_return<F>(&mut self, mut event_handler: F)
     where
-        F: FnMut(Event<T>, &RootELW<T>, &mut ControlFlow),
+        F: FnMut(Event<'_, T>, &RootELW<T>, &mut ControlFlow),
     {
         let event_loop_windows_ref = &self.window_target;
 
@@ -465,13 +465,6 @@ lazy_static! {
             winuser::RegisterWindowMessageA("Winit::DestroyMsg\0".as_ptr() as LPCSTR)
         }
     };
-    // Message sent by a `Window` after creation if it has a DPI != 96.
-    // WPARAM is the the DPI (u32). LOWORD of LPARAM is width, and HIWORD is height.
-    pub static ref INITIAL_DPI_MSG_ID: u32 = {
-        unsafe {
-            winuser::RegisterWindowMessageA("Winit::InitialDpiMsg\0".as_ptr() as LPCSTR)
-        }
-    };
     // WPARAM is a bool specifying the `WindowFlags::MARKER_RETAIN_STATE_ON_SIZE` flag. See the
     // documentation in the `window_state` module for more information.
     pub static ref SET_RETAIN_STATE_ON_SIZE_MSG_ID: u32 = unsafe {
@@ -597,7 +590,7 @@ fn normalize_pointer_pressure(pressure: u32) -> Option<Force> {
 //
 // Returning 0 tells the Win32 API that the message has been processed.
 // FIXME: detect WM_DWMCOMPOSITIONCHANGED and call DwmEnableBlurBehindWindow if necessary
-unsafe extern "system" fn public_window_callback<T>(
+unsafe extern "system" fn public_window_callback<T: 'static>(
     window: HWND,
     msg: UINT,
     wparam: WPARAM,
@@ -713,12 +706,11 @@ unsafe extern "system" fn public_window_callback<T>(
 
             let windowpos = lparam as *const winuser::WINDOWPOS;
             if (*windowpos).flags & winuser::SWP_NOMOVE != winuser::SWP_NOMOVE {
-                let dpi_factor = hwnd_scale_factor(window);
-                let logical_position =
-                    LogicalPosition::from_physical(((*windowpos).x, (*windowpos).y), dpi_factor);
+                let physical_position =
+                    PhysicalPosition::new((*windowpos).x as u32, (*windowpos).y as u32);
                 subclass_input.send_event(Event::WindowEvent {
                     window_id: RootWindowId(WindowId(window)),
-                    event: Moved(logical_position),
+                    event: Moved(physical_position),
                 });
             }
 
@@ -731,11 +723,10 @@ unsafe extern "system" fn public_window_callback<T>(
             let w = LOWORD(lparam as DWORD) as u32;
             let h = HIWORD(lparam as DWORD) as u32;
 
-            let dpi_factor = hwnd_scale_factor(window);
-            let logical_size = LogicalSize::from_physical((w, h), dpi_factor);
+            let physical_size = PhysicalSize::new(w, h);
             let event = Event::WindowEvent {
                 window_id: RootWindowId(WindowId(window)),
-                event: Resized(logical_size),
+                event: Resized(physical_size),
             };
 
             {
@@ -838,10 +829,9 @@ unsafe extern "system" fn public_window_callback<T>(
                 });
             }
 
-            let x = windowsx::GET_X_LPARAM(lparam) as f64;
-            let y = windowsx::GET_Y_LPARAM(lparam) as f64;
-            let dpi_factor = hwnd_scale_factor(window);
-            let position = LogicalPosition::from_physical((x, y), dpi_factor);
+            let x = windowsx::GET_X_LPARAM(lparam) as i32;
+            let y = windowsx::GET_Y_LPARAM(lparam) as i32;
+            let position = PhysicalPosition::new(x, y);
 
             subclass_input.send_event(Event::WindowEvent {
                 window_id: RootWindowId(WindowId(window)),
@@ -1130,7 +1120,6 @@ unsafe extern "system" fn public_window_callback<T>(
                 mem::size_of::<winuser::TOUCHINPUT>() as INT,
             ) > 0
             {
-                let dpi_factor = hwnd_scale_factor(window);
                 for input in &inputs {
                     let mut location = POINT {
                         x: input.x / 100,
@@ -1143,7 +1132,7 @@ unsafe extern "system" fn public_window_callback<T>(
 
                     let x = location.x as f64 + (input.x % 100) as f64 / 100f64;
                     let y = location.y as f64 + (input.y % 100) as f64 / 100f64;
-                    let location = LogicalPosition::from_physical((x, y), dpi_factor);
+                    let location = PhysicalPosition::new(x, y);
                     subclass_input.send_event(Event::WindowEvent {
                         window_id: RootWindowId(WindowId(window)),
                         event: WindowEvent::Touch(Touch {
@@ -1204,7 +1193,6 @@ unsafe extern "system" fn public_window_callback<T>(
                     return 0;
                 }
 
-                let dpi_factor = hwnd_scale_factor(window);
                 // https://docs.microsoft.com/en-us/windows/desktop/api/winuser/nf-winuser-getpointerframeinfohistory
                 // The information retrieved appears in reverse chronological order, with the most recent entry in the first
                 // row of the returned array
@@ -1282,7 +1270,7 @@ unsafe extern "system" fn public_window_callback<T>(
 
                     let x = location.x as f64 + x.fract();
                     let y = location.y as f64 + y.fract();
-                    let location = LogicalPosition::from_physical((x, y), dpi_factor);
+                    let location = PhysicalPosition::new(x, y);
                     subclass_input.send_event(Event::WindowEvent {
                         window_id: RootWindowId(WindowId(window)),
                         event: WindowEvent::Touch(Touch {
@@ -1403,11 +1391,9 @@ unsafe extern "system" fn public_window_callback<T>(
             let window_state = subclass_input.window_state.lock();
 
             if window_state.min_size.is_some() || window_state.max_size.is_some() {
-                let style = winuser::GetWindowLongA(window, winuser::GWL_STYLE) as DWORD;
-                let ex_style = winuser::GetWindowLongA(window, winuser::GWL_EXSTYLE) as DWORD;
                 if let Some(min_size) = window_state.min_size {
                     let min_size = min_size.to_physical(window_state.dpi_factor);
-                    let (width, height) = adjust_size(min_size, style, ex_style);
+                    let (width, height): (u32, u32) = util::adjust_size(window, min_size).into();
                     (*mmi).ptMinTrackSize = POINT {
                         x: width as i32,
                         y: height as i32,
@@ -1415,7 +1401,7 @@ unsafe extern "system" fn public_window_callback<T>(
                 }
                 if let Some(max_size) = window_state.max_size {
                     let max_size = max_size.to_physical(window_state.dpi_factor);
-                    let (width, height) = adjust_size(max_size, style, ex_style);
+                    let (width, height): (u32, u32) = util::adjust_size(window, max_size).into();
                     (*mmi).ptMaxTrackSize = POINT {
                         x: width as i32,
                         y: height as i32,
@@ -1429,7 +1415,7 @@ unsafe extern "system" fn public_window_callback<T>(
         // Only sent on Windows 8.1 or newer. On Windows 7 and older user has to log out to change
         // DPI, therefore all applications are closed while DPI is changing.
         winuser::WM_DPICHANGED => {
-            use crate::event::WindowEvent::HiDpiFactorChanged;
+            use crate::event::WindowEvent::ScaleFactorChanged;
 
             // This message actually provides two DPI values - x and y. However MSDN says that
             // "you only need to use either the X-axis or the Y-axis value when scaling your
@@ -1437,36 +1423,208 @@ unsafe extern "system" fn public_window_callback<T>(
             // https://msdn.microsoft.com/en-us/library/windows/desktop/dn312083(v=vs.85).aspx
             let new_dpi_x = u32::from(LOWORD(wparam as DWORD));
             let new_dpi_factor = dpi_to_scale_factor(new_dpi_x);
+            let old_dpi_factor: f64;
 
             let allow_resize = {
                 let mut window_state = subclass_input.window_state.lock();
-                let old_dpi_factor = window_state.dpi_factor;
+                old_dpi_factor = window_state.dpi_factor;
                 window_state.dpi_factor = new_dpi_factor;
 
-                new_dpi_factor != old_dpi_factor && window_state.fullscreen.is_none()
+                if new_dpi_factor == old_dpi_factor {
+                    return 0;
+                }
+
+                window_state.fullscreen.is_none()
+                    && !window_state.window_flags().contains(WindowFlags::MAXIMIZED)
             };
 
-            // This prevents us from re-applying DPI adjustment to the restored size after exiting
-            // fullscreen (the restored size is already DPI adjusted).
-            if allow_resize {
-                // Resize window to the size suggested by Windows.
-                let rect = &*(lparam as *const RECT);
-                winuser::SetWindowPos(
-                    window,
-                    ptr::null_mut(),
-                    rect.left,
-                    rect.top,
-                    rect.right - rect.left,
-                    rect.bottom - rect.top,
-                    winuser::SWP_NOZORDER | winuser::SWP_NOACTIVATE,
+            let style = winuser::GetWindowLongW(window, winuser::GWL_STYLE) as _;
+            let style_ex = winuser::GetWindowLongW(window, winuser::GWL_EXSTYLE) as _;
+            let b_menu = !winuser::GetMenu(window).is_null() as BOOL;
+
+            // New size as suggested by Windows.
+            let suggested_rect = *(lparam as *const RECT);
+
+            // The window rect provided is the window's outer size, not it's inner size. However,
+            // win32 doesn't provide an `UnadjustWindowRectEx` function to get the client rect from
+            // the outer rect, so we instead adjust the window rect to get the decoration margins
+            // and remove them from the outer size.
+            let margin_left: i32;
+            let margin_top: i32;
+            // let margin_right: i32;
+            // let margin_bottom: i32;
+            {
+                let mut adjusted_rect = suggested_rect;
+                winuser::AdjustWindowRectExForDpi(
+                    &mut adjusted_rect,
+                    style,
+                    b_menu,
+                    style_ex,
+                    new_dpi_x,
                 );
+                margin_left = suggested_rect.left - adjusted_rect.left;
+                margin_top = suggested_rect.top - adjusted_rect.top;
+                // margin_right = adjusted_rect.right - suggested_rect.right;
+                // margin_bottom = adjusted_rect.bottom - suggested_rect.bottom;
             }
 
-            subclass_input.send_event(Event::WindowEvent {
+            let old_physical_inner_rect = {
+                let mut old_physical_inner_rect = mem::zeroed();
+                winuser::GetClientRect(window, &mut old_physical_inner_rect);
+                let mut origin = mem::zeroed();
+                winuser::ClientToScreen(window, &mut origin);
+
+                old_physical_inner_rect.left += origin.x;
+                old_physical_inner_rect.right += origin.x;
+                old_physical_inner_rect.top += origin.y;
+                old_physical_inner_rect.bottom += origin.y;
+
+                old_physical_inner_rect
+            };
+            let old_physical_inner_size = PhysicalSize::new(
+                (old_physical_inner_rect.right - old_physical_inner_rect.left) as u32,
+                (old_physical_inner_rect.bottom - old_physical_inner_rect.top) as u32,
+            );
+
+            // `allow_resize` prevents us from re-applying DPI adjustment to the restored size after
+            // exiting fullscreen (the restored size is already DPI adjusted).
+            let mut new_physical_inner_size = match allow_resize {
+                // We calculate our own size because the default suggested rect doesn't do a great job
+                // of preserving the window's logical size.
+                true => old_physical_inner_size
+                    .to_logical::<f64>(old_dpi_factor)
+                    .to_physical::<u32>(new_dpi_factor),
+                false => old_physical_inner_size,
+            };
+
+            let _ = subclass_input.send_event_unbuffered(Event::WindowEvent {
                 window_id: RootWindowId(WindowId(window)),
-                event: HiDpiFactorChanged(new_dpi_factor),
+                event: ScaleFactorChanged {
+                    scale_factor: new_dpi_factor,
+                    new_inner_size: &mut new_physical_inner_size,
+                },
             });
 
+            // Unset maximized if we're changing the window's size.
+            if new_physical_inner_size != old_physical_inner_size {
+                WindowState::set_window_flags(subclass_input.window_state.lock(), window, |f| {
+                    f.set(WindowFlags::MAXIMIZED, false)
+                });
+            }
+
+            let new_outer_rect: RECT;
+            {
+                let suggested_ul = (
+                    suggested_rect.left + margin_left,
+                    suggested_rect.top + margin_top,
+                );
+
+                let mut conservative_rect = RECT {
+                    left: suggested_ul.0,
+                    top: suggested_ul.1,
+                    right: suggested_ul.0 + new_physical_inner_size.width as LONG,
+                    bottom: suggested_ul.1 + new_physical_inner_size.height as LONG,
+                };
+
+                winuser::AdjustWindowRectExForDpi(
+                    &mut conservative_rect,
+                    style,
+                    b_menu,
+                    style_ex,
+                    new_dpi_x,
+                );
+
+                // If we're not dragging the window, offset the window so that the cursor's
+                // relative horizontal position in the title bar is preserved.
+                let dragging_window = subclass_input.event_loop_runner.in_modal_loop();
+                if dragging_window {
+                    let bias = {
+                        let cursor_pos = {
+                            let mut pos = mem::zeroed();
+                            winuser::GetCursorPos(&mut pos);
+                            pos
+                        };
+                        let suggested_cursor_horizontal_ratio = (cursor_pos.x - suggested_rect.left)
+                            as f64
+                            / (suggested_rect.right - suggested_rect.left) as f64;
+
+                        (cursor_pos.x
+                            - (suggested_cursor_horizontal_ratio
+                                * (conservative_rect.right - conservative_rect.left) as f64)
+                                as LONG)
+                            - conservative_rect.left
+                    };
+                    conservative_rect.left += bias;
+                    conservative_rect.right += bias;
+                }
+
+                // Check to see if the new window rect is on the monitor with the new DPI factor.
+                // If it isn't, offset the window so that it is.
+                let new_dpi_monitor = winuser::MonitorFromWindow(window, 0);
+                let conservative_rect_monitor = winuser::MonitorFromRect(&conservative_rect, 0);
+                new_outer_rect = if conservative_rect_monitor == new_dpi_monitor {
+                    conservative_rect
+                } else {
+                    let get_monitor_rect = |monitor| {
+                        let mut monitor_info = winuser::MONITORINFO {
+                            cbSize: mem::size_of::<winuser::MONITORINFO>() as _,
+                            ..mem::zeroed()
+                        };
+                        winuser::GetMonitorInfoW(monitor, &mut monitor_info);
+                        monitor_info.rcMonitor
+                    };
+                    let wrong_monitor = conservative_rect_monitor;
+                    let wrong_monitor_rect = get_monitor_rect(wrong_monitor);
+                    let new_monitor_rect = get_monitor_rect(new_dpi_monitor);
+
+                    // The direction to nudge the window in to get the window onto the monitor with
+                    // the new DPI factor. We calculate this by seeing which monitor edges are
+                    // shared and nudging away from the wrong monitor based on those.
+                    let delta_nudge_to_dpi_monitor = (
+                        if wrong_monitor_rect.left == new_monitor_rect.right {
+                            -1
+                        } else if wrong_monitor_rect.right == new_monitor_rect.left {
+                            1
+                        } else {
+                            0
+                        },
+                        if wrong_monitor_rect.bottom == new_monitor_rect.top {
+                            1
+                        } else if wrong_monitor_rect.top == new_monitor_rect.bottom {
+                            -1
+                        } else {
+                            0
+                        },
+                    );
+
+                    let abort_after_iterations = new_monitor_rect.right - new_monitor_rect.left
+                        + new_monitor_rect.bottom
+                        - new_monitor_rect.top;
+                    for _ in 0..abort_after_iterations {
+                        conservative_rect.left += delta_nudge_to_dpi_monitor.0;
+                        conservative_rect.right += delta_nudge_to_dpi_monitor.0;
+                        conservative_rect.top += delta_nudge_to_dpi_monitor.1;
+                        conservative_rect.bottom += delta_nudge_to_dpi_monitor.1;
+
+                        if winuser::MonitorFromRect(&conservative_rect, 0) == new_dpi_monitor {
+                            break;
+                        }
+                    }
+
+                    conservative_rect
+                };
+            }
+
+            winuser::SetWindowPos(
+                window,
+                ptr::null_mut(),
+                new_outer_rect.left,
+                new_outer_rect.top,
+                new_outer_rect.right - new_outer_rect.left,
+                new_outer_rect.bottom - new_outer_rect.top,
+                winuser::SWP_NOZORDER | winuser::SWP_NOACTIVATE,
+            );
+
             0
         }
 
@@ -1502,44 +1660,6 @@ unsafe extern "system" fn public_window_callback<T>(
                     f.set(WindowFlags::MARKER_RETAIN_STATE_ON_SIZE, wparam != 0)
                 });
                 0
-            } else if msg == *INITIAL_DPI_MSG_ID {
-                use crate::event::WindowEvent::HiDpiFactorChanged;
-                let scale_factor = dpi_to_scale_factor(wparam as u32);
-                subclass_input.send_event(Event::WindowEvent {
-                    window_id: RootWindowId(WindowId(window)),
-                    event: HiDpiFactorChanged(scale_factor),
-                });
-                // Automatically resize for actual DPI
-                let width = LOWORD(lparam as DWORD) as u32;
-                let height = HIWORD(lparam as DWORD) as u32;
-                let (adjusted_width, adjusted_height): (u32, u32) =
-                    PhysicalSize::from_logical((width, height), scale_factor).into();
-                // We're not done yet! `SetWindowPos` needs the window size, not the client area size.
-                let mut rect = RECT {
-                    top: 0,
-                    left: 0,
-                    bottom: adjusted_height as LONG,
-                    right: adjusted_width as LONG,
-                };
-                let dw_style = winuser::GetWindowLongA(window, winuser::GWL_STYLE) as DWORD;
-                let b_menu = !winuser::GetMenu(window).is_null() as BOOL;
-                let dw_style_ex = winuser::GetWindowLongA(window, winuser::GWL_EXSTYLE) as DWORD;
-                winuser::AdjustWindowRectEx(&mut rect, dw_style, b_menu, dw_style_ex);
-                let outer_x = (rect.right - rect.left).abs() as c_int;
-                let outer_y = (rect.top - rect.bottom).abs() as c_int;
-                winuser::SetWindowPos(
-                    window,
-                    ptr::null_mut(),
-                    0,
-                    0,
-                    outer_x,
-                    outer_y,
-                    winuser::SWP_NOMOVE
-                        | winuser::SWP_NOREPOSITION
-                        | winuser::SWP_NOZORDER
-                        | winuser::SWP_NOACTIVATE,
-                );
-                0
             } else {
                 commctrl::DefSubclassProc(window, msg, wparam, lparam)
             }
@@ -1547,7 +1667,7 @@ unsafe extern "system" fn public_window_callback<T>(
     }
 }
 
-unsafe extern "system" fn thread_event_target_callback<T>(
+unsafe extern "system" fn thread_event_target_callback<T: 'static>(
     window: HWND,
     msg: UINT,
     wparam: WPARAM,

src/platform_impl/windows/event_loop/runner.rs

@@ -10,17 +10,17 @@ use crate::{
 };
 
 pub(crate) type EventLoopRunnerShared<T> = Rc<ELRShared<T>>;
-pub(crate) struct ELRShared<T> {
+pub(crate) struct ELRShared<T: 'static> {
     runner: RefCell<Option<EventLoopRunner<T>>>,
-    buffer: RefCell<VecDeque<Event<T>>>,
+    buffer: RefCell<VecDeque<Event<'static, T>>>,
     redraw_buffer: Rc<RefCell<VecDeque<WindowId>>>,
 }
-struct EventLoopRunner<T> {
+struct EventLoopRunner<T: 'static> {
     control_flow: ControlFlow,
     runner_state: RunnerState,
     modal_redraw_window: HWND,
     in_modal_loop: bool,
-    event_handler: Box<dyn FnMut(Event<T>, &mut ControlFlow)>,
+    event_handler: Box<dyn FnMut(Event<'_, T>, &mut ControlFlow)>,
     panic_error: Option<PanicError>,
     redraw_buffer: Rc<RefCell<VecDeque<WindowId>>>,
 }
@@ -37,7 +37,7 @@ impl<T> ELRShared<T> {
 
     pub(crate) unsafe fn set_runner<F>(&self, event_loop: &EventLoop<T>, f: F)
     where
-        F: FnMut(Event<T>, &mut ControlFlow),
+        F: FnMut(Event<'_, T>, &mut ControlFlow),
     {
         let mut runner = EventLoopRunner::new(event_loop, self.redraw_buffer.clone(), f);
         {
@@ -66,7 +66,18 @@ impl<T> ELRShared<T> {
         }
     }
 
-    pub(crate) unsafe fn send_event(&self, event: Event<T>) {
+    pub(crate) unsafe fn send_event(&self, event: Event<'static, T>) {
+        if let Err(event) = self.send_event_unbuffered(event) {
+            // If the runner is already borrowed, we're in the middle of an event loop invocation. Add
+            // the event to a buffer to be processed later.
+            self.buffer_event(event);
+        }
+    }
+
+    pub(crate) unsafe fn send_event_unbuffered<'e>(
+        &self,
+        event: Event<'e, T>,
+    ) -> Result<(), Event<'e, T>> {
         if let Ok(mut runner_ref) = self.runner.try_borrow_mut() {
             if let Some(ref mut runner) = *runner_ref {
                 runner.process_event(event);
@@ -84,16 +95,14 @@ impl<T> ELRShared<T> {
                     }
                 }
 
-                return;
+                return Ok(());
             }
         }
 
-        // If the runner is already borrowed, we're in the middle of an event loop invocation. Add
-        // the event to a buffer to be processed later.
-        self.buffer_event(event);
+        Err(event)
     }
 
-    pub(crate) unsafe fn call_event_handler(&self, event: Event<T>) {
+    pub(crate) unsafe fn call_event_handler(&self, event: Event<'static, T>) {
         if let Ok(mut runner_ref) = self.runner.try_borrow_mut() {
             if let Some(ref mut runner) = *runner_ref {
                 runner.call_event_handler(event);
@@ -143,7 +152,7 @@ impl<T> ELRShared<T> {
         }
     }
 
-    fn buffer_event(&self, event: Event<T>) {
+    fn buffer_event(&self, event: Event<'static, T>) {
         match event {
             Event::RedrawRequested(window_id) => {
                 self.redraw_buffer.borrow_mut().push_back(window_id)
@@ -176,7 +185,7 @@ impl<T> EventLoopRunner<T> {
         f: F,
     ) -> EventLoopRunner<T>
     where
-        F: FnMut(Event<T>, &mut ControlFlow),
+        F: FnMut(Event<'_, T>, &mut ControlFlow),
     {
         EventLoopRunner {
             control_flow: ControlFlow::default(),
@@ -184,8 +193,8 @@ impl<T> EventLoopRunner<T> {
             in_modal_loop: false,
             modal_redraw_window: event_loop.window_target.p.thread_msg_target,
             event_handler: mem::transmute::<
-                Box<dyn FnMut(Event<T>, &mut ControlFlow)>,
-                Box<dyn FnMut(Event<T>, &mut ControlFlow)>,
+                Box<dyn FnMut(Event<'_, T>, &mut ControlFlow)>,
+                Box<dyn FnMut(Event<'_, T>, &mut ControlFlow)>,
             >(Box::new(f)),
             panic_error: None,
             redraw_buffer,
@@ -251,7 +260,7 @@ impl<T> EventLoopRunner<T> {
         };
     }
 
-    fn process_event(&mut self, event: Event<T>) {
+    fn process_event(&mut self, event: Event<'_, T>) {
         // If we're in the modal loop, we need to have some mechanism for finding when the event
         // queue has been cleared so we can call `events_cleared`. Windows doesn't give any utilities
         // for doing this, but it DOES guarantee that WM_PAINT will only occur after input events have
@@ -390,7 +399,7 @@ impl<T> EventLoopRunner<T> {
         }
     }
 
-    fn call_event_handler(&mut self, event: Event<T>) {
+    fn call_event_handler(&mut self, event: Event<'_, T>) {
         if self.panic_error.is_none() {
             let EventLoopRunner {
                 ref mut panic_error,

src/platform_impl/windows/monitor.rs

@@ -62,7 +62,7 @@ impl std::fmt::Debug for VideoMode {
 }
 
 impl VideoMode {
-    pub fn size(&self) -> PhysicalSize {
+    pub fn size(&self) -> PhysicalSize<u32> {
         self.size.into()
     }
 
@@ -168,14 +168,6 @@ impl MonitorHandle {
         MonitorHandle(hmonitor)
     }
 
-    pub(crate) fn contains_point(&self, point: &POINT) -> bool {
-        let monitor_info = get_monitor_info(self.0).unwrap();
-        point.x >= monitor_info.rcMonitor.left
-            && point.x <= monitor_info.rcMonitor.right
-            && point.y >= monitor_info.rcMonitor.top
-            && point.y <= monitor_info.rcMonitor.bottom
-    }
-
     #[inline]
     pub fn name(&self) -> Option<String> {
         let monitor_info = get_monitor_info(self.0).unwrap();
@@ -193,25 +185,25 @@ impl MonitorHandle {
     }
 
     #[inline]
-    pub fn size(&self) -> PhysicalSize {
+    pub fn size(&self) -> PhysicalSize<u32> {
         let monitor_info = get_monitor_info(self.0).unwrap();
         PhysicalSize {
-            width: (monitor_info.rcMonitor.right - monitor_info.rcMonitor.left) as f64,
-            height: (monitor_info.rcMonitor.bottom - monitor_info.rcMonitor.top) as f64,
+            width: (monitor_info.rcMonitor.right - monitor_info.rcMonitor.left) as u32,
+            height: (monitor_info.rcMonitor.bottom - monitor_info.rcMonitor.top) as u32,
         }
     }
 
     #[inline]
-    pub fn position(&self) -> PhysicalPosition {
+    pub fn position(&self) -> PhysicalPosition<i32> {
         let monitor_info = get_monitor_info(self.0).unwrap();
         PhysicalPosition {
-            x: monitor_info.rcMonitor.left as f64,
-            y: monitor_info.rcMonitor.top as f64,
+            x: monitor_info.rcMonitor.left,
+            y: monitor_info.rcMonitor.top,
         }
     }
 
     #[inline]
-    pub fn hidpi_factor(&self) -> f64 {
+    pub fn scale_factor(&self) -> f64 {
         dpi_to_scale_factor(get_monitor_dpi(self.0).unwrap_or(96))
     }
 

src/platform_impl/windows/util.rs

@@ -6,51 +6,22 @@ use std::{
     sync::atomic::{AtomicBool, Ordering},
 };
 
-use crate::window::CursorIcon;
+use crate::{dpi::PhysicalSize, window::CursorIcon};
 use winapi::{
     ctypes::wchar_t,
     shared::{
-        minwindef::{BOOL, DWORD},
-        windef::{HWND, POINT, RECT},
+        minwindef::{BOOL, DWORD, UINT},
+        windef::{DPI_AWARENESS_CONTEXT, HMONITOR, HWND, LPRECT, RECT},
     },
     um::{
         libloaderapi::{GetProcAddress, LoadLibraryA},
+        shellscalingapi::{MONITOR_DPI_TYPE, PROCESS_DPI_AWARENESS},
         winbase::lstrlenW,
-        winnt::LPCSTR,
+        winnt::{HRESULT, LONG, LPCSTR},
         winuser,
     },
 };
 
-// Helper function to dynamically load function pointer.
-// `library` and `function` must be zero-terminated.
-pub(super) fn get_function_impl(library: &str, function: &str) -> Option<*const c_void> {
-    assert_eq!(library.chars().last(), Some('\0'));
-    assert_eq!(function.chars().last(), Some('\0'));
-
-    // Library names we will use are ASCII so we can use the A version to avoid string conversion.
-    let module = unsafe { LoadLibraryA(library.as_ptr() as LPCSTR) };
-    if module.is_null() {
-        return None;
-    }
-
-    let function_ptr = unsafe { GetProcAddress(module, function.as_ptr() as LPCSTR) };
-    if function_ptr.is_null() {
-        return None;
-    }
-
-    Some(function_ptr as _)
-}
-
-macro_rules! get_function {
-    ($lib:expr, $func:ident) => {
-        crate::platform_impl::platform::util::get_function_impl(
-            concat!($lib, '\0'),
-            concat!(stringify!($func), '\0'),
-        )
-        .map(|f| unsafe { std::mem::transmute::<*const _, $func>(f) })
-    };
-}
-
 pub fn has_flag<T>(bitset: T, flag: T) -> bool
 where
     T: Copy + PartialEq + BitAnd<T, Output = T>,
@@ -85,10 +56,6 @@ fn win_to_err<F: FnOnce() -> BOOL>(f: F) -> Result<(), io::Error> {
     }
 }
 
-pub fn get_cursor_pos() -> Option<POINT> {
-    unsafe { status_map(|cursor_pos| winuser::GetCursorPos(cursor_pos)) }
-}
-
 pub fn get_window_rect(hwnd: HWND) -> Option<RECT> {
     unsafe { status_map(|rect| winuser::GetWindowRect(hwnd, rect)) }
 }
@@ -109,6 +76,18 @@ pub fn get_client_rect(hwnd: HWND) -> Result<RECT, io::Error> {
     }
 }
 
+pub fn adjust_size(hwnd: HWND, size: PhysicalSize<u32>) -> PhysicalSize<u32> {
+    let (width, height): (u32, u32) = size.into();
+    let rect = RECT {
+        left: 0,
+        right: width as LONG,
+        top: 0,
+        bottom: height as LONG,
+    };
+    let rect = adjust_window_rect(hwnd, rect).unwrap_or(rect);
+    PhysicalSize::new((rect.right - rect.left) as _, (rect.bottom - rect.top) as _)
+}
+
 pub fn adjust_window_rect(hwnd: HWND, rect: RECT) -> Option<RECT> {
     unsafe {
         let style = winuser::GetWindowLongW(hwnd, winuser::GWL_STYLE);
@@ -128,7 +107,14 @@ pub fn adjust_window_rect_with_styles(
             *r = rect;
 
             let b_menu = !winuser::GetMenu(hwnd).is_null() as BOOL;
-            winuser::AdjustWindowRectEx(r, style as _, b_menu, style_ex as _)
+            if let (Some(get_dpi_for_window), Some(adjust_window_rect_ex_for_dpi)) =
+                (*GET_DPI_FOR_WINDOW, *ADJUST_WINDOW_RECT_EX_FOR_DPI)
+            {
+                let dpi = get_dpi_for_window(hwnd);
+                adjust_window_rect_ex_for_dpi(r, style as _, b_menu, style_ex as _, dpi)
+            } else {
+                winuser::AdjustWindowRectEx(r, style as _, b_menu, style_ex as _)
+            }
         })
     }
 }
@@ -210,3 +196,71 @@ impl CursorIcon {
         }
     }
 }
+
+// Helper function to dynamically load function pointer.
+// `library` and `function` must be zero-terminated.
+pub(super) fn get_function_impl(library: &str, function: &str) -> Option<*const c_void> {
+    assert_eq!(library.chars().last(), Some('\0'));
+    assert_eq!(function.chars().last(), Some('\0'));
+
+    // Library names we will use are ASCII so we can use the A version to avoid string conversion.
+    let module = unsafe { LoadLibraryA(library.as_ptr() as LPCSTR) };
+    if module.is_null() {
+        return None;
+    }
+
+    let function_ptr = unsafe { GetProcAddress(module, function.as_ptr() as LPCSTR) };
+    if function_ptr.is_null() {
+        return None;
+    }
+
+    Some(function_ptr as _)
+}
+
+macro_rules! get_function {
+    ($lib:expr, $func:ident) => {
+        crate::platform_impl::platform::util::get_function_impl(
+            concat!($lib, '\0'),
+            concat!(stringify!($func), '\0'),
+        )
+        .map(|f| unsafe { std::mem::transmute::<*const _, $func>(f) })
+    };
+}
+
+pub type SetProcessDPIAware = unsafe extern "system" fn() -> BOOL;
+pub type SetProcessDpiAwareness =
+    unsafe extern "system" fn(value: PROCESS_DPI_AWARENESS) -> HRESULT;
+pub type SetProcessDpiAwarenessContext =
+    unsafe extern "system" fn(value: DPI_AWARENESS_CONTEXT) -> BOOL;
+pub type GetDpiForWindow = unsafe extern "system" fn(hwnd: HWND) -> UINT;
+pub type GetDpiForMonitor = unsafe extern "system" fn(
+    hmonitor: HMONITOR,
+    dpi_type: MONITOR_DPI_TYPE,
+    dpi_x: *mut UINT,
+    dpi_y: *mut UINT,
+) -> HRESULT;
+pub type EnableNonClientDpiScaling = unsafe extern "system" fn(hwnd: HWND) -> BOOL;
+pub type AdjustWindowRectExForDpi = unsafe extern "system" fn(
+    rect: LPRECT,
+    dwStyle: DWORD,
+    bMenu: BOOL,
+    dwExStyle: DWORD,
+    dpi: UINT,
+) -> BOOL;
+
+lazy_static! {
+    pub static ref GET_DPI_FOR_WINDOW: Option<GetDpiForWindow> =
+        get_function!("user32.dll", GetDpiForWindow);
+    pub static ref ADJUST_WINDOW_RECT_EX_FOR_DPI: Option<AdjustWindowRectExForDpi> =
+        get_function!("user32.dll", AdjustWindowRectExForDpi);
+    pub static ref GET_DPI_FOR_MONITOR: Option<GetDpiForMonitor> =
+        get_function!("shcore.dll", GetDpiForMonitor);
+    pub static ref ENABLE_NON_CLIENT_DPI_SCALING: Option<EnableNonClientDpiScaling> =
+        get_function!("user32.dll", EnableNonClientDpiScaling);
+    pub static ref SET_PROCESS_DPI_AWARENESS_CONTEXT: Option<SetProcessDpiAwarenessContext> =
+        get_function!("user32.dll", SetProcessDpiAwarenessContext);
+    pub static ref SET_PROCESS_DPI_AWARENESS: Option<SetProcessDpiAwareness> =
+        get_function!("shcore.dll", SetProcessDpiAwareness);
+    pub static ref SET_PROCESS_DPI_AWARE: Option<SetProcessDPIAware> =
+        get_function!("user32.dll", SetProcessDPIAware);
+}

src/platform_impl/windows/window.rs

@@ -14,7 +14,7 @@ use std::{
 use winapi::{
     ctypes::c_int,
     shared::{
-        minwindef::{DWORD, HINSTANCE, LPARAM, UINT, WORD, WPARAM},
+        minwindef::{HINSTANCE, UINT},
         windef::{HWND, POINT, RECT},
     },
     um::{
@@ -30,14 +30,14 @@ use winapi::{
 };
 
 use crate::{
-    dpi::{LogicalPosition, LogicalSize, PhysicalSize},
+    dpi::{PhysicalPosition, PhysicalSize, Position, Size},
     error::{ExternalError, NotSupportedError, OsError as RootOsError},
     monitor::MonitorHandle as RootMonitorHandle,
     platform_impl::platform::{
         dark_mode::try_dark_mode,
         dpi::{dpi_to_scale_factor, hwnd_dpi},
         drop_handler::FileDropHandler,
-        event_loop::{self, EventLoopWindowTarget, DESTROY_MSG_ID, INITIAL_DPI_MSG_ID},
+        event_loop::{self, EventLoopWindowTarget, DESTROY_MSG_ID},
         icon::{self, IconType, WinIcon},
         monitor, util,
         window_state::{CursorFlags, SavedWindow, WindowFlags, WindowState},
@@ -125,8 +125,8 @@ impl Window {
 
     #[inline]
     pub fn set_visible(&self, visible: bool) {
-        let window_state = Arc::clone(&self.window_state);
         let window = self.window.clone();
+        let window_state = Arc::clone(&self.window_state);
         self.thread_executor.execute_in_thread(move || {
             WindowState::set_window_flags(window_state.lock(), window.0, |f| {
                 f.set(WindowFlags::VISIBLE, visible)
@@ -146,41 +146,34 @@ impl Window {
         }
     }
 
-    pub(crate) fn outer_position_physical(&self) -> (i32, i32) {
+    #[inline]
+    pub fn outer_position(&self) -> Result<PhysicalPosition<i32>, NotSupportedError> {
         util::get_window_rect(self.window.0)
-            .map(|rect| (rect.left as i32, rect.top as i32))
-            .unwrap()
+            .map(|rect| Ok(PhysicalPosition::new(rect.left as i32, rect.top as i32)))
+            .expect("Unexpected GetWindowRect failure; please report this error to https://github.com/rust-windowing/winit")
     }
 
     #[inline]
-    pub fn outer_position(&self) -> Result<LogicalPosition, NotSupportedError> {
-        let physical_position = self.outer_position_physical();
-        let dpi_factor = self.hidpi_factor();
-        Ok(LogicalPosition::from_physical(
-            physical_position,
-            dpi_factor,
-        ))
-    }
-
-    pub(crate) fn inner_position_physical(&self) -> (i32, i32) {
+    pub fn inner_position(&self) -> Result<PhysicalPosition<i32>, NotSupportedError> {
         let mut position: POINT = unsafe { mem::zeroed() };
         if unsafe { winuser::ClientToScreen(self.window.0, &mut position) } == 0 {
             panic!("Unexpected ClientToScreen failure: please report this error to https://github.com/rust-windowing/winit")
         }
-        (position.x, position.y)
+        Ok(PhysicalPosition::new(position.x as i32, position.y as i32))
     }
 
     #[inline]
-    pub fn inner_position(&self) -> Result<LogicalPosition, NotSupportedError> {
-        let physical_position = self.inner_position_physical();
-        let dpi_factor = self.hidpi_factor();
-        Ok(LogicalPosition::from_physical(
-            physical_position,
-            dpi_factor,
-        ))
-    }
+    pub fn set_outer_position(&self, position: Position) {
+        let (x, y): (i32, i32) = position.to_physical::<i32>(self.scale_factor()).into();
+
+        let window_state = Arc::clone(&self.window_state);
+        let window = self.window.clone();
+        self.thread_executor.execute_in_thread(move || {
+            WindowState::set_window_flags(window_state.lock(), window.0, |f| {
+                f.set(WindowFlags::MAXIMIZED, false)
+            });
+        });
 
-    pub(crate) fn set_position_physical(&self, x: i32, y: i32) {
         unsafe {
             winuser::SetWindowPos(
                 self.window.0,
@@ -199,43 +192,22 @@ impl Window {
     }
 
     #[inline]
-    pub fn set_outer_position(&self, logical_position: LogicalPosition) {
-        let dpi_factor = self.hidpi_factor();
-        let (x, y) = logical_position.to_physical(dpi_factor).into();
-
-        let window_state = Arc::clone(&self.window_state);
-        let window = self.window.clone();
-        self.thread_executor.execute_in_thread(move || {
-            WindowState::set_window_flags(window_state.lock(), window.0, |f| {
-                f.set(WindowFlags::MAXIMIZED, false)
-            });
-        });
-
-        self.set_position_physical(x, y);
-    }
-
-    pub(crate) fn inner_size_physical(&self) -> (u32, u32) {
+    pub fn inner_size(&self) -> PhysicalSize<u32> {
         let mut rect: RECT = unsafe { mem::zeroed() };
         if unsafe { winuser::GetClientRect(self.window.0, &mut rect) } == 0 {
             panic!("Unexpected GetClientRect failure: please report this error to https://github.com/rust-windowing/winit")
         }
-        (
+        PhysicalSize::new(
             (rect.right - rect.left) as u32,
             (rect.bottom - rect.top) as u32,
         )
     }
 
     #[inline]
-    pub fn inner_size(&self) -> LogicalSize {
-        let physical_size = self.inner_size_physical();
-        let dpi_factor = self.hidpi_factor();
-        LogicalSize::from_physical(physical_size, dpi_factor)
-    }
-
-    pub(crate) fn outer_size_physical(&self) -> (u32, u32) {
+    pub fn outer_size(&self) -> PhysicalSize<u32> {
         util::get_window_rect(self.window.0)
             .map(|rect| {
-                (
+                PhysicalSize::new(
                     (rect.right - rect.left) as u32,
                     (rect.bottom - rect.top) as u32,
                 )
@@ -243,13 +215,6 @@ impl Window {
             .unwrap()
     }
 
-    #[inline]
-    pub fn outer_size(&self) -> LogicalSize {
-        let physical_size = self.outer_size_physical();
-        let dpi_factor = self.hidpi_factor();
-        LogicalSize::from_physical(physical_size, dpi_factor)
-    }
-
     pub(crate) fn set_inner_size_physical(&self, x: u32, y: u32) {
         unsafe {
             let rect = util::adjust_window_rect(
@@ -283,9 +248,9 @@ impl Window {
     }
 
     #[inline]
-    pub fn set_inner_size(&self, logical_size: LogicalSize) {
-        let dpi_factor = self.hidpi_factor();
-        let (width, height) = logical_size.to_physical(dpi_factor).into();
+    pub fn set_inner_size(&self, size: Size) {
+        let dpi_factor = self.scale_factor();
+        let (width, height) = size.to_physical::<u32>(dpi_factor).into();
 
         let window_state = Arc::clone(&self.window_state);
         let window = self.window.clone();
@@ -298,36 +263,20 @@ impl Window {
         self.set_inner_size_physical(width, height);
     }
 
-    pub(crate) fn set_min_inner_size_physical(&self, dimensions: Option<(u32, u32)>) {
-        self.window_state.lock().min_size = dimensions.map(Into::into);
+    #[inline]
+    pub fn set_min_inner_size(&self, size: Option<Size>) {
+        self.window_state.lock().min_size = size;
         // Make windows re-check the window size bounds.
-        let (width, height) = self.inner_size_physical();
-        self.set_inner_size_physical(width, height);
+        let size = self.inner_size();
+        self.set_inner_size(size.into());
     }
 
     #[inline]
-    pub fn set_min_inner_size(&self, logical_size: Option<LogicalSize>) {
-        let physical_size = logical_size.map(|logical_size| {
-            let dpi_factor = self.hidpi_factor();
-            logical_size.to_physical(dpi_factor).into()
-        });
-        self.set_min_inner_size_physical(physical_size);
-    }
-
-    pub fn set_max_inner_size_physical(&self, dimensions: Option<(u32, u32)>) {
-        self.window_state.lock().max_size = dimensions.map(Into::into);
+    pub fn set_max_inner_size(&self, size: Option<Size>) {
+        self.window_state.lock().max_size = size;
         // Make windows re-check the window size bounds.
-        let (width, height) = self.inner_size_physical();
-        self.set_inner_size_physical(width, height);
-    }
-
-    #[inline]
-    pub fn set_max_inner_size(&self, logical_size: Option<LogicalSize>) {
-        let physical_size = logical_size.map(|logical_size| {
-            let dpi_factor = self.hidpi_factor();
-            logical_size.to_physical(dpi_factor).into()
-        });
-        self.set_max_inner_size_physical(physical_size);
+        let size = self.inner_size();
+        self.set_inner_size(size.into());
     }
 
     #[inline]
@@ -407,11 +356,15 @@ impl Window {
     }
 
     #[inline]
-    pub fn hidpi_factor(&self) -> f64 {
+    pub fn scale_factor(&self) -> f64 {
         self.window_state.lock().dpi_factor
     }
 
-    fn set_cursor_position_physical(&self, x: i32, y: i32) -> Result<(), ExternalError> {
+    #[inline]
+    pub fn set_cursor_position(&self, position: Position) -> Result<(), ExternalError> {
+        let dpi_factor = self.scale_factor();
+        let (x, y) = position.to_physical::<i32>(dpi_factor).into();
+
         let mut point = POINT { x, y };
         unsafe {
             if winuser::ClientToScreen(self.window.0, &mut point) == 0 {
@@ -424,16 +377,6 @@ impl Window {
         Ok(())
     }
 
-    #[inline]
-    pub fn set_cursor_position(
-        &self,
-        logical_position: LogicalPosition,
-    ) -> Result<(), ExternalError> {
-        let dpi_factor = self.hidpi_factor();
-        let (x, y) = logical_position.to_physical(dpi_factor).into();
-        self.set_cursor_position_physical(x, y)
-    }
-
     #[inline]
     pub fn id(&self) -> WindowId {
         WindowId(self.window.0)
@@ -691,7 +634,7 @@ impl Window {
     }
 
     #[inline]
-    pub fn set_ime_position(&self, _logical_spot: LogicalPosition) {
+    pub fn set_ime_position(&self, _position: Position) {
         unimplemented!();
     }
 
@@ -724,22 +667,6 @@ pub struct WindowWrapper(HWND);
 unsafe impl Sync for WindowWrapper {}
 unsafe impl Send for WindowWrapper {}
 
-pub unsafe fn adjust_size(
-    physical_size: PhysicalSize,
-    style: DWORD,
-    ex_style: DWORD,
-) -> (LONG, LONG) {
-    let (width, height): (u32, u32) = physical_size.into();
-    let mut rect = RECT {
-        left: 0,
-        right: width as LONG,
-        top: 0,
-        bottom: height as LONG,
-    };
-    winuser::AdjustWindowRectEx(&mut rect, style, 0, ex_style);
-    (rect.right - rect.left, rect.bottom - rect.top)
-}
-
 unsafe fn init<T: 'static>(
     mut attributes: WindowAttributes,
     pl_attribs: PlatformSpecificWindowBuilderAttributes,
@@ -770,41 +697,6 @@ unsafe fn init<T: 'static>(
     // registering the window class
     let class_name = register_window_class(&window_icon, &taskbar_icon);
 
-    let guessed_dpi_factor = {
-        let monitors = monitor::available_monitors();
-        let dpi_factor = if !monitors.is_empty() {
-            let mut dpi_factor = Some(monitors[0].hidpi_factor());
-            for monitor in &monitors {
-                if Some(monitor.hidpi_factor()) != dpi_factor {
-                    dpi_factor = None;
-                }
-            }
-            dpi_factor
-        } else {
-            return Err(os_error!(io::Error::new(
-                io::ErrorKind::NotFound,
-                "No monitors were detected."
-            )));
-        };
-        dpi_factor.unwrap_or_else(|| {
-            util::get_cursor_pos()
-                .and_then(|cursor_pos| {
-                    let mut dpi_factor = None;
-                    for monitor in &monitors {
-                        if monitor.contains_point(&cursor_pos) {
-                            dpi_factor = Some(monitor.hidpi_factor());
-                            break;
-                        }
-                    }
-                    dpi_factor
-                })
-                .unwrap_or(1.0)
-        })
-    };
-    info!("Guessed window DPI factor: {}", guessed_dpi_factor);
-
-    let dimensions = attributes.inner_size.unwrap_or_else(|| (1024, 768).into());
-
     let mut window_flags = WindowFlags::empty();
     window_flags.set(WindowFlags::DECORATIONS, attributes.decorations);
     window_flags.set(WindowFlags::ALWAYS_ON_TOP, attributes.always_on_top);
@@ -853,20 +745,6 @@ unsafe fn init<T: 'static>(
 
     let dpi = hwnd_dpi(real_window.0);
     let dpi_factor = dpi_to_scale_factor(dpi);
-    if dpi_factor != guessed_dpi_factor {
-        let (width, height): (u32, u32) = dimensions.into();
-        let mut packed_dimensions = 0;
-        // MAKELPARAM isn't provided by winapi yet.
-        let ptr = &mut packed_dimensions as *mut LPARAM as *mut WORD;
-        *ptr.offset(0) = width as WORD;
-        *ptr.offset(1) = height as WORD;
-        winuser::PostMessageW(
-            real_window.0,
-            *INITIAL_DPI_MSG_ID,
-            dpi as WPARAM,
-            packed_dimensions,
-        );
-    }
 
     // making the window transparent
     if attributes.transparent && !pl_attribs.no_redirection_bitmap {
@@ -900,7 +778,6 @@ unsafe fn init<T: 'static>(
         }
     }
 
-    window_flags.set(WindowFlags::VISIBLE, attributes.visible);
     window_flags.set(WindowFlags::MAXIMIZED, attributes.maximized);
 
     // If the system theme is dark, we need to set the window theme now
@@ -927,15 +804,17 @@ unsafe fn init<T: 'static>(
         thread_executor: event_loop.create_thread_executor(),
     };
 
+    let dimensions = attributes
+        .inner_size
+        .unwrap_or_else(|| PhysicalSize::new(1024, 768).into());
+    win.set_inner_size(dimensions);
+    win.set_visible(attributes.visible);
+
     if let Some(_) = attributes.fullscreen {
         win.set_fullscreen(attributes.fullscreen);
         force_window_active(win.window.0);
     }
 
-    if let Some(dimensions) = attributes.inner_size {
-        win.set_inner_size(dimensions);
-    }
-
     Ok(win)
 }
 

src/platform_impl/windows/window_state.rs

@@ -1,5 +1,5 @@
 use crate::{
-    dpi::LogicalSize,
+    dpi::Size,
     platform_impl::platform::{event_loop, icon::WinIcon, util},
     window::{CursorIcon, Fullscreen, WindowAttributes},
 };
@@ -19,8 +19,8 @@ pub struct WindowState {
     pub mouse: MouseProperties,
 
     /// Used by `WM_GETMINMAXINFO`.
-    pub min_size: Option<LogicalSize>,
-    pub max_size: Option<LogicalSize>,
+    pub min_size: Option<Size>,
+    pub max_size: Option<Size>,
 
     pub window_icon: Option<WinIcon>,
     pub taskbar_icon: Option<WinIcon>,

src/window.rs

@@ -2,7 +2,7 @@
 use std::fmt;
 
 use crate::{
-    dpi::{LogicalPosition, LogicalSize},
+    dpi::{PhysicalPosition, PhysicalSize, Position, Size},
     error::{ExternalError, NotSupportedError, OsError},
     event_loop::EventLoopWindowTarget,
     monitor::{MonitorHandle, VideoMode},
@@ -102,17 +102,17 @@ pub struct WindowAttributes {
     /// used.
     ///
     /// The default is `None`.
-    pub inner_size: Option<LogicalSize>,
+    pub inner_size: Option<Size>,
 
     /// The minimum dimensions a window can be, If this is `None`, the window will have no minimum dimensions (aside from reserved).
     ///
     /// The default is `None`.
-    pub min_inner_size: Option<LogicalSize>,
+    pub min_inner_size: Option<Size>,
 
     /// The maximum dimensions a window can be, If this is `None`, the maximum will have no maximum or will be set to the primary monitor's dimensions by the platform.
     ///
     /// The default is `None`.
-    pub max_inner_size: Option<LogicalSize>,
+    pub max_inner_size: Option<Size>,
 
     /// Whether the window is resizable or not.
     ///
@@ -197,8 +197,8 @@ impl WindowBuilder {
     ///
     /// [`Window::set_inner_size`]: crate::window::Window::set_inner_size
     #[inline]
-    pub fn with_inner_size(mut self, size: LogicalSize) -> Self {
-        self.window.inner_size = Some(size);
+    pub fn with_inner_size<S: Into<Size>>(mut self, size: S) -> Self {
+        self.window.inner_size = Some(size.into());
         self
     }
 
@@ -208,8 +208,8 @@ impl WindowBuilder {
     ///
     /// [`Window::set_min_inner_size`]: crate::window::Window::set_min_inner_size
     #[inline]
-    pub fn with_min_inner_size(mut self, min_size: LogicalSize) -> Self {
-        self.window.min_inner_size = Some(min_size);
+    pub fn with_min_inner_size<S: Into<Size>>(mut self, min_size: S) -> Self {
+        self.window.min_inner_size = Some(min_size.into());
         self
     }
 
@@ -219,8 +219,8 @@ impl WindowBuilder {
     ///
     /// [`Window::set_max_inner_size`]: crate::window::Window::set_max_inner_size
     #[inline]
-    pub fn with_max_inner_size(mut self, max_size: LogicalSize) -> Self {
-        self.window.max_inner_size = Some(max_size);
+    pub fn with_max_inner_size<S: Into<Size>>(mut self, max_size: S) -> Self {
+        self.window.max_inner_size = Some(max_size.into());
         self
     }
 
@@ -366,25 +366,25 @@ impl Window {
         WindowId(self.window.id())
     }
 
-    /// Returns the DPI factor that can be used to map logical pixels to physical pixels, and vice versa.
+    /// Returns the scale factor that can be used to map logical pixels to physical pixels, and vice versa.
     ///
     /// See the [`dpi`](crate::dpi) module for more information.
     ///
     /// Note that this value can change depending on user action (for example if the window is
-    /// moved to another screen); as such, tracking `WindowEvent::HiDpiFactorChanged` events is
+    /// moved to another screen); as such, tracking `WindowEvent::ScaleFactorChanged` events is
     /// the most robust way to track the DPI you need to use to draw.
     ///
     /// ## Platform-specific
     ///
-    /// - **X11:** This respects Xft.dpi, and can be overridden using the `WINIT_HIDPI_FACTOR` environment variable.
+    /// - **X11:** This respects Xft.dpi, and can be overridden using the `WINIT_X11_SCALE_FACTOR` environment variable.
     /// - **Android:** Always returns 1.0.
     /// - **iOS:** Can only be called on the main thread. Returns the underlying `UIView`'s
     ///   [`contentScaleFactor`].
     ///
     /// [`contentScaleFactor`]: https://developer.apple.com/documentation/uikit/uiview/1622657-contentscalefactor?language=objc
     #[inline]
-    pub fn hidpi_factor(&self) -> f64 {
-        self.window.hidpi_factor()
+    pub fn scale_factor(&self) -> f64 {
+        self.window.scale_factor()
     }
 
     /// Emits a `WindowEvent::RedrawRequested` event in the associated event loop after all OS
@@ -419,10 +419,12 @@ impl Window {
     ///
     /// - **iOS:** Can only be called on the main thread. Returns the top left coordinates of the
     ///   window's [safe area] in the screen space coordinate system.
+    /// - **Web:** Returns the top-left coordinates relative to the viewport. _Note: this returns the
+    ///    same value as `outer_position`._
     ///
     /// [safe area]: https://developer.apple.com/documentation/uikit/uiview/2891103-safeareainsets?language=objc
     #[inline]
-    pub fn inner_position(&self) -> Result<LogicalPosition, NotSupportedError> {
+    pub fn inner_position(&self) -> Result<PhysicalPosition<i32>, NotSupportedError> {
         self.window.inner_position()
     }
 
@@ -440,8 +442,9 @@ impl Window {
     ///
     /// - **iOS:** Can only be called on the main thread. Returns the top left coordinates of the
     ///   window in the screen space coordinate system.
+    /// - **Web:** Returns the top-left coordinates relative to the viewport.
     #[inline]
-    pub fn outer_position(&self) -> Result<LogicalPosition, NotSupportedError> {
+    pub fn outer_position(&self) -> Result<PhysicalPosition<i32>, NotSupportedError> {
         self.window.outer_position()
     }
 
@@ -454,25 +457,25 @@ impl Window {
     ///
     /// - **iOS:** Can only be called on the main thread. Sets the top left coordinates of the
     ///   window in the screen space coordinate system.
+    /// - **Web:** Sets the top-left coordinates relative to the viewport.
     #[inline]
-    pub fn set_outer_position(&self, position: LogicalPosition) {
-        self.window.set_outer_position(position)
+    pub fn set_outer_position<P: Into<Position>>(&self, position: P) {
+        self.window.set_outer_position(position.into())
     }
 
-    /// Returns the logical size of the window's client area.
+    /// Returns the physical size of the window's client area.
     ///
     /// The client area is the content of the window, excluding the title bar and borders.
     ///
-    /// Converting the returned `LogicalSize` to `PhysicalSize` produces the size your framebuffer should be.
-    ///
     /// ## Platform-specific
     ///
-    /// - **iOS:** Can only be called on the main thread. Returns the `LogicalSize` of the window's
+    /// - **iOS:** Can only be called on the main thread. Returns the `PhysicalSize` of the window's
     ///   [safe area] in screen space coordinates.
+    /// - **Web:** Returns the size of the canvas element.
     ///
     /// [safe area]: https://developer.apple.com/documentation/uikit/uiview/2891103-safeareainsets?language=objc
     #[inline]
-    pub fn inner_size(&self) -> LogicalSize {
+    pub fn inner_size(&self) -> PhysicalSize<u32> {
         self.window.inner_size()
     }
 
@@ -485,22 +488,25 @@ impl Window {
     ///
     /// - **iOS:** Unimplemented. Currently this panics, as it's not clear what `set_inner_size`
     ///   would mean for iOS.
+    /// - **Web:** Sets the size of the canvas element.
     #[inline]
-    pub fn set_inner_size(&self, size: LogicalSize) {
-        self.window.set_inner_size(size)
+    pub fn set_inner_size<S: Into<Size>>(&self, size: S) {
+        self.window.set_inner_size(size.into())
     }
 
-    /// Returns the logical size of the entire window.
+    /// Returns the physical size of the entire window.
     ///
     /// These dimensions include the title bar and borders. If you don't want that (and you usually don't),
     /// use `inner_size` instead.
     ///
     /// ## Platform-specific
     ///
-    /// - **iOS:** Can only be called on the main thread. Returns the `LogicalSize` of the window in
+    /// - **iOS:** Can only be called on the main thread. Returns the `PhysicalSize` of the window in
     ///   screen space coordinates.
+    /// - **Web:** Returns the size of the canvas element. _Note: this returns the same value as
+    ///   `inner_size`._
     #[inline]
-    pub fn outer_size(&self) -> LogicalSize {
+    pub fn outer_size(&self) -> PhysicalSize<u32> {
         self.window.outer_size()
     }
 
@@ -511,8 +517,8 @@ impl Window {
     /// - **iOS:** Has no effect.
     /// - **Web:** Has no effect.
     #[inline]
-    pub fn set_min_inner_size(&self, dimensions: Option<LogicalSize>) {
-        self.window.set_min_inner_size(dimensions)
+    pub fn set_min_inner_size<S: Into<Size>>(&self, min_size: Option<S>) {
+        self.window.set_min_inner_size(min_size.map(|s| s.into()))
     }
 
     /// Sets a maximum dimension size for the window.
@@ -522,8 +528,8 @@ impl Window {
     /// - **iOS:** Has no effect.
     /// - **Web:** Has no effect.
     #[inline]
-    pub fn set_max_inner_size(&self, dimensions: Option<LogicalSize>) {
-        self.window.set_max_inner_size(dimensions)
+    pub fn set_max_inner_size<S: Into<Size>>(&self, max_size: Option<S>) {
+        self.window.set_max_inner_size(max_size.map(|s| s.into()))
     }
 }
 
@@ -675,8 +681,8 @@ impl Window {
     /// **iOS:** Has no effect.
     /// - **Web:** Has no effect.
     #[inline]
-    pub fn set_ime_position(&self, position: LogicalPosition) {
-        self.window.set_ime_position(position)
+    pub fn set_ime_position<P: Into<Position>>(&self, position: P) {
+        self.window.set_ime_position(position.into())
     }
 }
 
@@ -700,8 +706,8 @@ impl Window {
     /// - **iOS:** Always returns an `Err`.
     /// - **Web:** Has no effect.
     #[inline]
-    pub fn set_cursor_position(&self, position: LogicalPosition) -> Result<(), ExternalError> {
-        self.window.set_cursor_position(position)
+    pub fn set_cursor_position<P: Into<Position>>(&self, position: P) -> Result<(), ExternalError> {
+        self.window.set_cursor_position(position.into())
     }
 
     /// Grabs the cursor, preventing it from leaving the window.

tests/serde_objects.rs

@@ -31,8 +31,9 @@ fn events_serde() {
 
 #[test]
 fn dpi_serde() {
-    needs_serde::<LogicalPosition>();
-    needs_serde::<PhysicalPosition>();
-    needs_serde::<LogicalSize>();
-    needs_serde::<PhysicalSize>();
+    needs_serde::<LogicalPosition<f64>>();
+    needs_serde::<PhysicalPosition<i32>>();
+    needs_serde::<PhysicalPosition<f64>>();
+    needs_serde::<LogicalSize<f64>>();
+    needs_serde::<PhysicalSize<u32>>();
 }