Support fetching viewport info

components/script/dom/xrviewport.rs

@@ -0,0 +1,59 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+use crate::dom::bindings::codegen::Bindings::XRViewportBinding;
+use crate::dom::bindings::codegen::Bindings::XRViewportBinding::XRViewportMethods;
+use crate::dom::bindings::reflector::{reflect_dom_object, Reflector};
+use crate::dom::bindings::root::DomRoot;
+use crate::dom::globalscope::GlobalScope;
+use dom_struct::dom_struct;
+
+#[dom_struct]
+pub struct XRViewport {
+    reflector_: Reflector,
+    x: u32,
+    y: u32,
+    width: u32,
+    height: u32,
+}
+
+impl XRViewport {
+    fn new_inherited(x: u32, y: u32, width: u32, height: u32) -> XRViewport {
+        XRViewport {
+            reflector_: Reflector::new(),
+            x, y, width, height
+        }
+    }
+
+    pub fn new(global: &GlobalScope,
+               x: u32, y: u32, width: u32, height: u32) -> DomRoot<XRViewport> {
+        reflect_dom_object(
+            Box::new(XRViewport::new_inherited(x, y, width, height)),
+            global,
+            XRViewportBinding::Wrap,
+        )
+    }
+}
+
+impl XRViewportMethods for XRViewport {
+    /// https://immersive-web.github.io/webxr/#dom-xrviewport-x
+    fn X(&self) -> i32 {
+        self.x as i32
+    }
+
+    /// https://immersive-web.github.io/webxr/#dom-xrviewport-y
+    fn Y(&self) -> i32 {
+        self.y as i32
+    }
+
+    /// https://immersive-web.github.io/webxr/#dom-xrviewport-width
+    fn Width(&self) -> i32 {
+        self.height as i32
+    }
+
+    /// https://immersive-web.github.io/webxr/#dom-xrviewport-height
+    fn Height(&self) -> i32 {
+        self.height as i32
+    }
+}