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+/* 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/. */
+
+//! Common feature values between media and container features.
+
+use app_units::Au;
+use euclid::default::Size2D;
+
+/// The orientation media / container feature.
+/// https://drafts.csswg.org/mediaqueries-5/#orientation
+/// https://drafts.csswg.org/css-contain-3/#orientation
+#[derive(Clone, Copy, Debug, FromPrimitive, Parse, ToCss)]
+#[repr(u8)]
+#[allow(missing_docs)]
+pub enum Orientation {
+ Portrait,
+ Landscape,
+}
+
+impl Orientation {
+ /// A helper to evaluate a orientation query given a generic size getter.
+ pub fn eval(size: Size2D<Au>, value: Option<Self>) -> bool {
+ let query_orientation = match value {
+ Some(v) => v,
+ None => return true,
+ };
+
+ // Per spec, square viewports should be 'portrait'
+ let is_landscape = size.width > size.height;
+ match query_orientation {
+ Self::Landscape => is_landscape,
+ Self::Portrait => !is_landscape,
+ }
+ }
+}