WIP - Make EL2 DPI changes and implement on Windows (#895)

* Modify DPI API publicly and on Windows

* Add generic Position and make dpi creation functions const

* Make examples work

* Fix fullscreen windows not appearing

* Replace Logical coordinates in window events with Physical coordinates

* Update HiDpiFactorChanged

* Document to_static

examples/multithreaded.rs

@@ -5,20 +5,21 @@ fn main() {
     use std::{collections::HashMap, sync::mpsc, thread, time::Duration};
 
     use winit::{
+    	dpi::{PhysicalPosition, PhysicalSize},
         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 = 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();
 
@@ -101,7 +102,7 @@ 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),
@@ -114,17 +115,18 @@ fn main() {
                             }),
                             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,
-                                }
-                                .into(),
-                            ),
+                            S => window.set_inner_size(match state {
+                                true => PhysicalSize::new(
+                                    WINDOW_SIZE.width + 100,
+                                    WINDOW_SIZE.height + 100,
+                                ),
+                                false => WINDOW_SIZE,
+                            }),
                             W => window
-                                .set_cursor_position(
-                                    (WINDOW_SIZE.0 as i32 / 2, WINDOW_SIZE.1 as i32 / 2).into(),
-                                )
+                                .set_cursor_position(PhysicalPosition::new(
+                                    WINDOW_SIZE.width as f64 / 2.0,
+                                    WINDOW_SIZE.height as f64 / 2.0,
+                                ))
                                 .unwrap(),
                             Z => {
                                 window.set_visible(false);
@@ -161,7 +163,9 @@ 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/resizable.rs

@@ -1,4 +1,5 @@
 use winit::{
+    dpi::LogicalSize,
     event::{ElementState, Event, KeyboardInput, VirtualKeyCode, WindowEvent},
     event_loop::{ControlFlow, EventLoop},
     window::WindowBuilder,
@@ -11,7 +12,7 @@ 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();

examples/window.rs

@@ -9,6 +9,7 @@ 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();
 

src/dpi.rs

@@ -100,7 +100,7 @@ pub struct LogicalPosition {
 
 impl LogicalPosition {
     #[inline]
-    pub fn new(x: f64, y: f64) -> Self {
+    pub const fn new(x: f64, y: f64) -> Self {
         LogicalPosition { x, y }
     }
 
@@ -161,7 +161,7 @@ pub struct PhysicalPosition {
 
 impl PhysicalPosition {
     #[inline]
-    pub fn new(x: f64, y: f64) -> Self {
+    pub const fn new(x: f64, y: f64) -> Self {
         PhysicalPosition { x, y }
     }
 
@@ -222,7 +222,7 @@ pub struct LogicalSize {
 
 impl LogicalSize {
     #[inline]
-    pub fn new(width: f64, height: f64) -> Self {
+    pub const fn new(width: f64, height: f64) -> Self {
         LogicalSize { width, height }
     }
 
@@ -236,7 +236,7 @@ impl LogicalSize {
         assert!(validate_hidpi_factor(dpi_factor));
         let width = self.width * dpi_factor;
         let height = self.height * dpi_factor;
-        PhysicalSize::new(width, height)
+        PhysicalSize::new(width.round() as _, height.round() as _)
     }
 }
 
@@ -270,20 +270,16 @@ impl Into<(u32, u32)> for LogicalSize {
 }
 
 /// 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 width: u32,
+    pub height: u32,
 }
 
 impl PhysicalSize {
     #[inline]
-    pub fn new(width: f64, height: f64) -> Self {
+    pub const fn new(width: u32, height: u32) -> Self {
         PhysicalSize { width, height }
     }
 
@@ -295,37 +291,105 @@ impl PhysicalSize {
     #[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;
+        let width = self.width as f64 / dpi_factor;
+        let height = self.height as f64 / dpi_factor;
         LogicalSize::new(width, height)
     }
 }
 
-impl From<(f64, f64)> for PhysicalSize {
+impl From<(u32, u32)> for PhysicalSize {
     #[inline]
-    fn from((width, height): (f64, f64)) -> Self {
+    fn from((width, height): (u32, u32)) -> Self {
         Self::new(width, height)
     }
 }
 
-impl From<(u32, u32)> for PhysicalSize {
+impl Into<(u32, u32)> for PhysicalSize {
+    /// Note that this rounds instead of truncating.
     #[inline]
-    fn from((width, height): (u32, u32)) -> Self {
-        Self::new(width as f64, height as f64)
+    fn into(self) -> (u32, u32) {
+        (self.width, self.height)
     }
 }
 
-impl Into<(f64, f64)> for PhysicalSize {
+#[derive(Debug, Copy, Clone, PartialEq)]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
+pub enum Size {
+    Physical(PhysicalSize),
+    Logical(LogicalSize),
+}
+
+impl Size {
+    pub fn new<S: Into<Size>>(size: S) -> Size {
+        size.into()
+    }
+
+    pub fn to_logical(&self, dpi_factor: f64) -> LogicalSize {
+        match *self {
+            Size::Physical(size) => size.to_logical(dpi_factor),
+            Size::Logical(size) => size,
+        }
+    }
+
+    pub fn to_physical(&self, dpi_factor: f64) -> PhysicalSize {
+        match *self {
+            Size::Physical(size) => size,
+            Size::Logical(size) => size.to_physical(dpi_factor),
+        }
+    }
+}
+
+impl From<PhysicalSize> for Size {
     #[inline]
-    fn into(self) -> (f64, f64) {
-        (self.width, self.height)
+    fn from(size: PhysicalSize) -> Size {
+        Size::Physical(size)
     }
 }
 
-impl Into<(u32, u32)> for PhysicalSize {
-    /// Note that this rounds instead of truncating.
+impl From<LogicalSize> for Size {
     #[inline]
-    fn into(self) -> (u32, u32) {
-        (self.width.round() as _, self.height.round() as _)
+    fn from(size: LogicalSize) -> Size {
+        Size::Logical(size)
+    }
+}
+
+#[derive(Debug, Copy, Clone, PartialEq)]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
+pub enum Position {
+    Physical(PhysicalPosition),
+    Logical(LogicalPosition),
+}
+
+impl Position {
+    pub fn new<S: Into<Position>>(position: S) -> Position {
+        position.into()
+    }
+
+    pub fn to_logical(&self, dpi_factor: f64) -> LogicalPosition {
+        match *self {
+            Position::Physical(position) => position.to_logical(dpi_factor),
+            Position::Logical(position) => position,
+        }
+    }
+
+    pub fn to_physical(&self, dpi_factor: f64) -> PhysicalPosition {
+        match *self {
+            Position::Physical(position) => position,
+            Position::Logical(position) => position.to_physical(dpi_factor),
+        }
+    }
+}
+
+impl From<PhysicalPosition> for Position {
+    #[inline]
+    fn from(position: PhysicalPosition) -> Position {
+        Position::Physical(position)
+    }
+}
+
+impl From<LogicalPosition> for Position {
+    #[inline]
+    fn from(position: LogicalPosition) -> Position {
+        Position::Logical(position)
     }
 }