Add canvas feature to iced_wgpu

And prepare `canvas` module

wgpu/Cargo.toml

@@ -9,6 +9,7 @@ repository = "https://github.com/hecrj/iced"
 
 [features]
 svg = ["resvg"]
+canvas = ["lyon"]
 
 [dependencies]
 iced_native = { version = "0.1.0", path = "../native" }
@@ -20,5 +21,16 @@ raw-window-handle = "0.3"
 glam = "0.8"
 font-kit = "0.4"
 log = "0.4"
-resvg = { version = "0.8", features = ["raqote-backend"], optional = true }
-image = { version = "0.22", optional = true }
+
+[dependencies.image]
+version = "0.22"
+optional = true
+
+[dependencies.resvg]
+version = "0.8"
+features = ["raqote-backend"]
+optional = true
+
+[dependencies.lyon]
+version = "0.15"
+optional = true

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;