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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
commit26a029d407be480d791972afb5975cf62c9360a6 (patch)
treef435a8308119effd964b339f76abb83a57c29483 /servo/components/style/font_metrics.rs
parentInitial commit. (diff)
downloadfirefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz
firefox-26a029d407be480d791972afb5975cf62c9360a6.zip
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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diff --git a/servo/components/style/font_metrics.rs b/servo/components/style/font_metrics.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/. */
+
+//! Access to font metrics from the style system.
+
+#![deny(missing_docs)]
+
+use crate::values::computed::Length;
+
+/// Represents the font metrics that style needs from a font to compute the
+/// value of certain CSS units like `ex`.
+#[derive(Clone, Debug, PartialEq)]
+pub struct FontMetrics {
+ /// The x-height of the font.
+ pub x_height: Option<Length>,
+ /// The zero advance. This is usually writing mode dependent
+ pub zero_advance_measure: Option<Length>,
+ /// The cap-height of the font.
+ pub cap_height: Option<Length>,
+ /// The ideographic-width of the font.
+ pub ic_width: Option<Length>,
+ /// The ascent of the font (a value is always available for this).
+ pub ascent: Length,
+ /// Script scale down factor for math-depth 1.
+ /// https://w3c.github.io/mathml-core/#dfn-scriptpercentscaledown
+ pub script_percent_scale_down: Option<f32>,
+ /// Script scale down factor for math-depth 2.
+ /// https://w3c.github.io/mathml-core/#dfn-scriptscriptpercentscaledown
+ pub script_script_percent_scale_down: Option<f32>,
+}
+
+impl Default for FontMetrics {
+ fn default() -> Self {
+ FontMetrics {
+ x_height: None,
+ zero_advance_measure: None,
+ cap_height: None,
+ ic_width: None,
+ ascent: Length::new(0.0),
+ script_percent_scale_down: None,
+ script_script_percent_scale_down: None,
+ }
+ }
+}
+
+/// Type of font metrics to retrieve.
+#[derive(Clone, Debug, PartialEq)]
+pub enum FontMetricsOrientation {
+ /// Get metrics for horizontal or vertical according to the Context's
+ /// writing mode, using horizontal metrics for vertical/mixed
+ MatchContextPreferHorizontal,
+ /// Get metrics for horizontal or vertical according to the Context's
+ /// writing mode, using vertical metrics for vertical/mixed
+ MatchContextPreferVertical,
+ /// Force getting horizontal metrics.
+ Horizontal,
+}