Add canvas feature to iced_wgpu

And prepare `canvas` module

wgpu/src/lib.rs

@@ -19,7 +19,7 @@
 //! [`wgpu`]: https://github.com/gfx-rs/wgpu-rs
 //! [WebGPU API]: https://gpuweb.github.io/gpuweb/
 //! [`wgpu_glyph`]: https://github.com/hecrj/wgpu_glyph
-#![deny(missing_docs)]
+//#![deny(missing_docs)]
 #![deny(missing_debug_implementations)]
 #![deny(unused_results)]
 #![forbid(unsafe_code)]

wgpu/src/widget.rs

@@ -32,3 +32,10 @@ pub use scrollable::Scrollable;
 pub use slider::Slider;
 #[doc(no_inline)]
 pub use text_input::TextInput;
+
+#[cfg(feature = "canvas")]
+pub mod canvas;
+
+#[cfg(feature = "canvas")]
+#[doc(no_inline)]
+pub use canvas::Canvas;

wgpu/src/widget/canvas.rs

@@ -0,0 +1,5 @@
+//! Draw freely in 2D.
+
+/// A 2D drawable region.
+#[derive(Debug)]
+pub struct Canvas;