1 files changed, 54 insertions, 0 deletions
diff --git a/servo/components/style/values/generics/background.rs b/servo/components/style/values/generics/background.rs
new file mode 100644
index 0000000000..d9b6624595
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+++ b/servo/components/style/values/generics/background.rs
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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/. */
+
+//! Generic types for CSS values related to backgrounds.
+
+use crate::values::generics::length::{GenericLengthPercentageOrAuto, LengthPercentageOrAuto};
+
+/// A generic value for the `background-size` property.
+#[derive(
+    Animate,
+    Clone,
+    ComputeSquaredDistance,
+    Copy,
+    Debug,
+    MallocSizeOf,
+    PartialEq,
+    SpecifiedValueInfo,
+    ToAnimatedValue,
+    ToAnimatedZero,
+    ToComputedValue,
+    ToCss,
+    ToResolvedValue,
+    ToShmem,
+)]
+#[repr(C, u8)]
+pub enum GenericBackgroundSize<LengthPercent> {
+    /// `<width> <height>`
+    ExplicitSize {
+        /// Explicit width.
+        width: GenericLengthPercentageOrAuto<LengthPercent>,
+        /// Explicit height.
+        #[css(skip_if = "GenericLengthPercentageOrAuto::is_auto")]
+        height: GenericLengthPercentageOrAuto<LengthPercent>,
+    },
+    /// `cover`
+    #[animation(error)]
+    Cover,
+    /// `contain`
+    #[animation(error)]
+    Contain,
+}
+
+pub use self::GenericBackgroundSize as BackgroundSize;
+
+impl<LengthPercentage> BackgroundSize<LengthPercentage> {
+    /// Returns `auto auto`.
+    pub fn auto() -> Self {
+        GenericBackgroundSize::ExplicitSize {
+            width: LengthPercentageOrAuto::Auto,
+            height: LengthPercentageOrAuto::Auto,
+        }
+    }
+}