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-rw-r--r--servo/components/style/values/computed/resolution.rs56
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diff --git a/servo/components/style/values/computed/resolution.rs b/servo/components/style/values/computed/resolution.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/. */
+
+//! Resolution values:
+//!
+//! https://drafts.csswg.org/css-values/#resolution
+
+use crate::values::computed::{Context, ToComputedValue};
+use crate::values::specified;
+use crate::values::CSSFloat;
+use std::fmt::{self, Write};
+use style_traits::{CssWriter, ToCss};
+
+/// A computed `<resolution>`.
+#[repr(C)]
+#[derive(Animate, Clone, Debug, MallocSizeOf, PartialEq, ToResolvedValue, ToShmem)]
+pub struct Resolution(CSSFloat);
+
+impl Resolution {
+ /// Returns this resolution value as dppx.
+ #[inline]
+ pub fn dppx(&self) -> CSSFloat {
+ self.0
+ }
+
+ /// Return a computed `resolution` value from a dppx float value.
+ #[inline]
+ pub fn from_dppx(dppx: CSSFloat) -> Self {
+ Resolution(dppx)
+ }
+}
+
+impl ToComputedValue for specified::Resolution {
+ type ComputedValue = Resolution;
+
+ #[inline]
+ fn to_computed_value(&self, _: &Context) -> Self::ComputedValue {
+ Resolution(crate::values::normalize(self.dppx().max(0.0)))
+ }
+
+ #[inline]
+ fn from_computed_value(computed: &Self::ComputedValue) -> Self {
+ specified::Resolution::from_dppx(computed.dppx())
+ }
+}
+
+impl ToCss for Resolution {
+ fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
+ where
+ W: fmt::Write,
+ {
+ self.dppx().to_css(dest)?;
+ dest.write_str("dppx")
+ }
+}