Improve macOS/iOS/Web thread safety

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

src/platform_impl/macos/util.rs

@@ -0,0 +1,60 @@
+use core_graphics::display::CGDisplay;
+use icrate::Foundation::{CGFloat, NSNotFound, NSPoint, NSRange, NSRect, NSUInteger};
+
+use crate::dpi::LogicalPosition;
+
+// Replace with `!` once stable
+#[derive(Debug)]
+pub enum Never {}
+
+pub const EMPTY_RANGE: NSRange = NSRange {
+    location: NSNotFound as NSUInteger,
+    length: 0,
+};
+
+macro_rules! trace_scope {
+    ($s:literal) => {
+        let _crate = $crate::platform_impl::platform::util::TraceGuard::new(module_path!(), $s);
+    };
+}
+
+pub(crate) struct TraceGuard {
+    module_path: &'static str,
+    called_from_fn: &'static str,
+}
+
+impl TraceGuard {
+    #[inline]
+    pub(crate) fn new(module_path: &'static str, called_from_fn: &'static str) -> Self {
+        trace!(target: module_path, "Triggered `{}`", called_from_fn);
+        Self {
+            module_path,
+            called_from_fn,
+        }
+    }
+}
+
+impl Drop for TraceGuard {
+    #[inline]
+    fn drop(&mut self) {
+        trace!(target: self.module_path, "Completed `{}`", self.called_from_fn);
+    }
+}
+
+// For consistency with other platforms, this will...
+// 1. translate the bottom-left window corner into the top-left window corner
+// 2. translate the coordinate from a bottom-left origin coordinate system to a top-left one
+#[allow(clippy::unnecessary_cast)]
+pub fn bottom_left_to_top_left(rect: NSRect) -> f64 {
+    CGDisplay::main().pixels_high() as f64 - (rect.origin.y + rect.size.height) as f64
+}
+
+/// Converts from winit screen-coordinates to macOS screen-coordinates.
+/// Winit: top-left is (0, 0) and y increasing downwards
+/// macOS: bottom-left is (0, 0) and y increasing upwards
+pub fn window_position(position: LogicalPosition<f64>) -> NSPoint {
+    NSPoint::new(
+        position.x as CGFloat,
+        CGDisplay::main().pixels_high() as CGFloat - position.y as CGFloat,
+    )
+}