Make fill_window a no-op on mobile platforms for now

Cargo.toml

@@ -62,6 +62,8 @@ smol_str = "0.2.0"
 [dev-dependencies]
 image = { version = "0.24.0", default-features = false, features = ["png"] }
 simple_logger = { version = "2.1.0", default_features = false }
+
+[target.'cfg(not(any(target_os = "android", target_os = "ios")))'.dev-dependencies]
 softbuffer = "0.2.0"
 
 [target.'cfg(target_os = "android")'.dependencies]

examples/util/fill.rs

@@ -7,12 +7,15 @@
 //! The `softbuffer` crate is used, largely because of its ease of use. `glutin` or `wgpu` could
 //! also be used to fill the window buffer, but they are more complicated to use.
 
-use softbuffer::GraphicsContext;
-use std::cell::RefCell;
-use std::collections::HashMap;
-use winit::window::{Window, WindowId};
+use winit::window::Window;
 
+#[cfg(not(any(target_os = "android", target_os = "ios")))]
 pub(super) fn fill_window(window: &Window) {
+    use softbuffer::GraphicsContext;
+    use std::cell::RefCell;
+    use std::collections::HashMap;
+    use winit::window::WindowId;
+
     thread_local! {
         /// A static, thread-local map of graphics contexts to open windows.
         static GC: RefCell<HashMap<WindowId, GraphicsContext>> = RefCell::new(HashMap::new());
@@ -35,3 +38,8 @@ pub(super) fn fill_window(window: &Window) {
         context.set_buffer(&buffer, size.width as u16, size.height as u16);
     })
 }
+
+#[cfg(any(target_os = "android", target_os = "ios"))]
+pub(super) fn fill_window(_window: &Window) {
+    // No-op on mobile platforms.
+}