crates/core/tests/control_sizes.rs

@@ -36,10 +36,11 @@ impl Render for Harness {
     }
 }
 
-/// A medium input is exactly `input_height`, and sits taller than the
-/// medium button: native text fields are a touch taller than push buttons.
+/// The medium input renders at the theme's stated field height and the
+/// medium button at the stated control height; the two match wherever the
+/// platform states equal values (macOS, Windows, GNOME).
 #[gpui::test]
-fn medium_input_is_taller_than_the_button(cx: &mut TestAppContext) {
+fn controls_render_at_the_stated_heights(cx: &mut TestAppContext) {
     cx.update(Theme::init);
     let state = cx.update(|cx| InputState::new_with_text("", cx));
     let state_for_window = state.clone();
@@ -58,9 +59,9 @@ fn medium_input_is_taller_than_the_button(cx: &mut TestAppContext) {
         .debug_bounds("input-wrapper")
         .expect("input rendered");
 
-    // The input's height is the theme table's (platform-stated) field height;
-    // both bounds are snapped to device pixels, so allow half a pixel.
+    // Both bounds are snapped to device pixels, so allow half a pixel.
     let input_height = cx.update(|cx| cx.theme().sizes.medium.input_height);
-    assert!(input.size.height > button.size.height);
+    let button_height = cx.update(|cx| cx.theme().sizes.medium.control_height);
     assert!((input.size.height - input_height).abs() <= gpui::px(0.5));
+    assert!((button.size.height - button_height).abs() <= gpui::px(0.5));
 }

crates/theme/src/definition.rs

@@ -11,6 +11,8 @@ use crate::ThemeVariant;
 pub struct ThemeDefinition {
     pub mode: Option<ThemeVariant>,
     pub control_radius: Option<f32>,
+    pub overlay_radius: Option<f32>,
+    pub sm_radius: Option<f32>,
     pub accent: Option<String>,
     pub accent_foreground: Option<String>,
     pub background: Option<String>,
@@ -221,13 +223,15 @@ mod tests {
     #[test]
     fn parses_a_full_definition() {
         let def = ThemeDefinition::parse_toml(
-            "mode = \"dark\"\naccent = \"#7aa2f7\"\nbackground = \"#1a1b26\"\ninfo = \"#38bdf8\"\n",
+            "mode = \"dark\"\naccent = \"#7aa2f7\"\nbackground = \"#1a1b26\"\ninfo = \"#38bdf8\"\noverlay_radius = 15.0\nsm_radius = 6.0\n",
         )
         .unwrap();
         assert_eq!(def.mode, Some(crate::ThemeVariant::Dark));
         assert!(def.accent().is_some());
         assert!(def.info().is_some());
         assert!(def.foreground().is_none());
+        assert_eq!(def.overlay_radius, Some(15.0));
+        assert_eq!(def.sm_radius, Some(6.0));
     }
 
     #[test]

crates/theme/src/lib.rs

@@ -48,6 +48,9 @@ pub struct Theme {
     pub colors: ColorTokens,
     pub ramps: Ramps,
     pub radius: Radius,
+    /// Per-platform border and focus chrome.
+    pub borders: Borders,
+    pub spacing: Spacing,
     pub elevations: Elevations,
     /// Overlay transition timing; gpui's animation primitives do the rest.
     pub motion: Motion,
@@ -88,6 +91,59 @@ impl Default for Radius {
     }
 }
 
+/// Which surfaces keep a 1px border, per the platform's chrome: Windows and
+/// KDE frame their controls, macOS and GNOME paint fills.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub struct Borders {
+    /// Filled actions keep a border (Windows, KDE).
+    pub buttons: bool,
+    /// Text fields and selects keep a border (Windows, KDE; the macOS
+    /// hairline bezel).
+    pub fields: bool,
+    /// Floating layers keep a border (Windows, KDE).
+    pub overlays: bool,
+    /// Keyboard focus paints an accent ring around the control (macOS,
+    /// GNOME); otherwise focus re-colors the border (Windows, KDE).
+    pub focus_ring: bool,
+}
+
+impl Borders {
+    pub(crate) fn for_platform(source: SourceKind) -> Self {
+        match source {
+            SourceKind::Windows | SourceKind::Kde => Self {
+                buttons: true,
+                fields: true,
+                overlays: true,
+                focus_ring: false,
+            },
+            SourceKind::Macos => Self {
+                buttons: false,
+                fields: true,
+                overlays: false,
+                focus_ring: true,
+            },
+            SourceKind::Omarchy | SourceKind::Gnome => Self {
+                buttons: false,
+                fields: false,
+                overlays: false,
+                focus_ring: true,
+            },
+            SourceKind::Fallback => Self {
+                buttons: true,
+                fields: true,
+                overlays: true,
+                focus_ring: false,
+            },
+        }
+    }
+}
+
+/// The spacing rhythm of the platform: paddings and gaps step by this unit.
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub struct Spacing {
+    pub unit: Pixels,
+}
+
 /// One layer of a floating panel's drop shadow.
 #[derive(Clone, Copy, Debug, PartialEq)]
 pub struct Shadow {
@@ -289,6 +345,12 @@ pub struct ControlMetrics {
     pub plate_inset: Pixels,
     /// The band height of multi-segment strips.
     pub strip_height: Pixels,
+    /// The height of one menu row.
+    pub menu_item_height: Pixels,
+    /// Switch track height, width, and knob size.
+    pub switch_height: Pixels,
+    pub switch_width: Pixels,
+    pub switch_knob: Pixels,
 }
 
 /// The control metrics for every size class.
@@ -309,6 +371,7 @@ impl SizeTable {
             avatar: f32,
             strip: f32,
             inset: f32,
+            floor_icon: bool,
         }
 
         let small = ClassFactors {
@@ -319,6 +382,7 @@ impl SizeTable {
             avatar: 1.5,
             strip: 1.5,
             inset: 0.125,
+            floor_icon: false,
         };
 
         let medium = ClassFactors {
@@ -329,6 +393,7 @@ impl SizeTable {
             avatar: 2.0,
             strip: 2.0,
             inset: 0.25,
+            floor_icon: true,
         };
 
         let large = ClassFactors {
@@ -339,21 +404,36 @@ impl SizeTable {
             avatar: 3.0,
             strip: 3.0,
             inset: 0.375,
+            floor_icon: true,
         };
 
-        let metrics = |f: &ClassFactors| ControlMetrics {
-            control_height: rem_size * f.height,
-            input_height: rem_size * (f.height + 0.125),
-            padding_x: rem_size * f.padding,
-            text_size: rem_size * f.text,
-            icon_size: rem_size * f.icon,
-            dense_icon_size: rem_size * f.icon * 0.75,
-            indicator_size: rem_size * f.height * 0.7,
-            avatar_size: rem_size * f.avatar,
-            caption_size: rem_size * f.text,
-            dense_padding_x: rem_size * f.padding * 0.75,
-            plate_inset: rem_size * f.inset,
-            strip_height: rem_size * f.strip,
+        let metrics = |f: &ClassFactors| {
+            // Standard controls carry 16px glyphs on every platform, fixed
+            // against the root font the way the platforms fix them.
+            let icon_size = if f.floor_icon {
+                (rem_size * f.icon).max(px(16.))
+            } else {
+                rem_size * f.icon
+            };
+            let switch_height = rem_size * f.height * 0.75;
+            ControlMetrics {
+                control_height: rem_size * f.height,
+                input_height: rem_size * (f.height + 0.125),
+                padding_x: rem_size * f.padding,
+                text_size: rem_size * f.text,
+                icon_size,
+                dense_icon_size: icon_size * 0.75,
+                indicator_size: rem_size * f.height * 0.7,
+                avatar_size: rem_size * f.avatar,
+                caption_size: rem_size * f.text,
+                dense_padding_x: rem_size * f.padding * 0.75,
+                plate_inset: rem_size * f.inset,
+                strip_height: rem_size * f.strip,
+                menu_item_height: rem_size * f.height * 0.85,
+                switch_height,
+                switch_width: switch_height * 2.25,
+                switch_knob: switch_height * 0.85,
+            }
         };
 
         let mut table = Self {
@@ -383,6 +463,35 @@ impl SizeTable {
         self.medium.input_height = medium_input_height;
         self.large.input_height *= ratio;
     }
+
+    /// Sets the medium class's control height to the platform's stated value.
+    pub fn set_control_height(&mut self, medium_control_height: Pixels) {
+        let ratio = medium_control_height / self.medium.control_height;
+        self.small.control_height *= ratio;
+        self.medium.control_height = medium_control_height;
+        self.large.control_height *= ratio;
+    }
+
+    /// Sets the medium class's menu row height to the platform's stated value.
+    pub fn set_menu_item_height(&mut self, medium_menu_item_height: Pixels) {
+        let ratio = medium_menu_item_height / self.medium.menu_item_height;
+        self.small.menu_item_height *= ratio;
+        self.medium.menu_item_height = medium_menu_item_height;
+        self.large.menu_item_height *= ratio;
+    }
+
+    /// Sets the medium class's switch dimensions to the platform's stated values.
+    pub fn set_switch_metrics(&mut self, track_height: Pixels, track_width: Pixels, knob: Pixels) {
+        let ratio = track_height / self.medium.switch_height;
+        for metrics in [&mut self.small, &mut self.large] {
+            metrics.switch_height *= ratio;
+            metrics.switch_width *= ratio;
+            metrics.switch_knob *= ratio;
+        }
+        self.medium.switch_height = track_height;
+        self.medium.switch_width = track_width;
+        self.medium.switch_knob = knob;
+    }
 }
 
 /// Reads the resolved theme global from any app context.
@@ -408,6 +517,8 @@ impl Theme {
             colors: resolved.colors,
             ramps: resolved.ramps,
             radius: resolved.radius,
+            borders: resolved.borders,
+            spacing: resolved.spacing,
             elevations: resolved.elevations,
             motion: resolved.motion,
             scrollbar: resolved.scrollbar,

crates/theme/src/resolve.rs

@@ -1,7 +1,9 @@
 use crate::definition::ThemeDefinition;
 use crate::ramps::{AccentShades, Oklch, contrast_foreground, derive_shades, mix};
 use crate::system::SystemTheme;
-use crate::{ColorTokens, Elevations, Motion, Radius, Scrollbar, SizeTable, ThemeVariant};
+use crate::{
+    Borders, ColorTokens, Elevations, Motion, Radius, Scrollbar, SizeTable, Spacing, ThemeVariant,
+};
 use gpui::px;
 
 /// The floor of a custom titlebar's height, in px at 100% scaling: the height
@@ -26,6 +28,8 @@ pub struct ResolvedTheme {
     pub colors: ColorTokens,
     pub ramps: Ramps,
     pub radius: Radius,
+    pub borders: Borders,
+    pub spacing: Spacing,
     pub elevations: Elevations,
     pub motion: Motion,
     pub scrollbar: Scrollbar,
@@ -198,18 +202,35 @@ pub(crate) fn resolve(
     //
     // Fallback: 16 (the web default gpui also uses for rems).
     let root_font_size = system.root_font_size.unwrap_or(px(16.));
-
     let mut sizes = SizeTable::with_root_font_size(root_font_size);
+
+    if let Some(control_height) = system.control_height {
+        sizes.set_control_height(control_height);
+    }
+
     if let Some(input_height) = system.input_height {
         sizes.set_input_height(input_height);
     }
 
+    if let Some(switch_height) = system.switch_height {
+        sizes.set_switch_metrics(
+            switch_height,
+            system.switch_width.unwrap_or(switch_height * 2.25),
+            system.switch_knob.unwrap_or(switch_height * 0.85),
+        );
+    }
+
+    if let Some(menu_item_height) = system.menu_item_height {
+        sizes.set_menu_item_height(menu_item_height);
+    }
+
     // A platform that states its titlebar height wins.
     let titlebar_height = system
         .titlebar_height
         .unwrap_or_else(|| sizes.medium.control_height.max(px(TITLEBAR_HEIGHT_MIN_PX)));
 
     let mut radius = Radius::default();
+
     if let Some(control) = preset
         .and_then(|def| def.control_radius)
         .map(px)
@@ -218,6 +239,22 @@ pub(crate) fn resolve(
         radius.control = control;
     }
 
+    if let Some(overlay) = preset
+        .and_then(|def| def.overlay_radius)
+        .map(px)
+        .or(system.overlay_radius)
+    {
+        radius.overlay = overlay;
+    }
+
+    if let Some(sm) = preset
+        .and_then(|def| def.sm_radius)
+        .map(px)
+        .or(system.sm_radius)
+    {
+        radius.sm = sm;
+    }
+
     ResolvedTheme {
         variant,
         ramps: Ramps {
@@ -238,6 +275,10 @@ pub(crate) fn resolve(
         },
         colors,
         radius,
+        borders: Borders::for_platform(system.source),
+        spacing: Spacing {
+            unit: system.source.spacing_unit(),
+        },
         elevations: Elevations::for_platform(system.source, variant),
         motion: Motion::default(),
         scrollbar: Scrollbar {
@@ -283,7 +324,14 @@ mod tests {
             accent,
             palette,
             control_radius: None,
+            overlay_radius: None,
+            sm_radius: None,
+            control_height: None,
             input_height: None,
+            menu_item_height: None,
+            switch_height: None,
+            switch_width: None,
+            switch_knob: None,
             titlebar_height: None,
             root_font_size: None,
             accessibility: AccessibilityPreferences::default(),
@@ -308,7 +356,10 @@ mod tests {
     fn empty_system_resolves_to_the_neutral_fallback() {
         for variant in [ThemeVariant::Light, ThemeVariant::Dark] {
             let resolved = resolve(
-                &system(variant, PartialPalette::default(), None),
+                &SystemTheme {
+                    source: SourceKind::Fallback,
+                    ..system(variant, PartialPalette::default(), None)
+                },
                 None,
                 None,
             );
@@ -333,6 +384,21 @@ mod tests {
             assert_eq!(resolved.sizes.medium.dense_padding_x, px(16. * 0.75));
             assert_eq!(resolved.sizes.medium.plate_inset, px(4.));
             assert_eq!(resolved.sizes.medium.strip_height, px(32.));
+            assert_eq!(resolved.sizes.medium.icon_size, px(16.));
+            assert_eq!(resolved.sizes.medium.menu_item_height, px(28. * 0.85));
+            assert_eq!(resolved.sizes.medium.switch_height, px(21.));
+            assert_eq!(resolved.sizes.medium.switch_width, px(21. * 2.25));
+            assert_eq!(resolved.sizes.medium.switch_knob, px(21. * 0.85));
+            assert_eq!(
+                resolved.borders,
+                Borders {
+                    buttons: true,
+                    fields: true,
+                    overlays: true,
+                    focus_ring: false,
+                }
+            );
+            assert_eq!(resolved.spacing.unit, px(4.));
             assert_eq!(resolved.titlebar_height, px(34.));
         }
     }
@@ -396,6 +462,89 @@ mod tests {
         assert!((resolved.sizes.small.input_height - expected_small).abs() < px(0.01));
     }
 
+    #[test]
+    fn a_stated_control_height_overrides_the_medium_class_and_scales() {
+        let mut stated = system(ThemeVariant::Light, PartialPalette::default(), None);
+        stated.control_height = Some(px(32.));
+        let resolved = resolve(&stated, None, None);
+        assert_eq!(resolved.sizes.medium.control_height, px(32.));
+
+        let derived = SizeTable::with_root_font_size(px(16.));
+        let scale = px(32.) / derived.medium.control_height;
+        assert!(
+            (resolved.sizes.small.control_height - derived.small.control_height * scale).abs()
+                < px(0.01)
+        );
+        assert!(
+            (resolved.sizes.large.control_height - derived.large.control_height * scale).abs()
+                < px(0.01)
+        );
+    }
+
+    #[test]
+    fn stated_switch_and_menu_metrics_override_the_derived_ones() {
+        let mut stated = system(ThemeVariant::Light, PartialPalette::default(), None);
+        stated.switch_height = Some(px(20.));
+        stated.switch_width = Some(px(40.));
+        stated.switch_knob = Some(px(12.));
+        stated.menu_item_height = Some(px(33.));
+        let resolved = resolve(&stated, None, None);
+
+        assert_eq!(resolved.sizes.medium.switch_height, px(20.));
+        assert_eq!(resolved.sizes.medium.switch_width, px(40.));
+        assert_eq!(resolved.sizes.medium.switch_knob, px(12.));
+        assert_eq!(resolved.sizes.medium.menu_item_height, px(33.));
+    }
+
+    #[test]
+    fn the_radius_ladder_follows_stated_values_with_preset_priority() {
+        let mut stated = system(ThemeVariant::Light, PartialPalette::default(), None);
+        stated.control_radius = Some(px(9.));
+        stated.overlay_radius = Some(px(15.));
+        stated.sm_radius = Some(px(6.));
+        let resolved = resolve(&stated, None, None);
+        assert_eq!(resolved.radius.control, px(9.));
+        assert_eq!(resolved.radius.overlay, px(15.));
+        assert_eq!(resolved.radius.sm, px(6.));
+
+        let def = ThemeDefinition::parse_toml("overlay_radius = 12.0\n").unwrap();
+        let overridden = resolve(&stated, Some(&def), None);
+        assert_eq!(overridden.radius.overlay, px(12.));
+        assert_eq!(overridden.radius.sm, px(6.));
+    }
+
+    #[test]
+    fn borders_and_spacing_follow_the_platform_source() {
+        let chrome = |source| {
+            let mut stated = system(ThemeVariant::Light, PartialPalette::default(), None);
+            stated.source = source;
+            let resolved = resolve(&stated, None, None);
+            (resolved.borders, resolved.spacing.unit)
+        };
+
+        let (borders, unit) = chrome(SourceKind::Windows);
+        assert!(borders.buttons && borders.fields && borders.overlays && !borders.focus_ring);
+        assert_eq!(unit, px(4.));
+
+        let (borders, unit) = chrome(SourceKind::Kde);
+        assert!(borders.buttons && borders.fields && borders.overlays && !borders.focus_ring);
+        assert_eq!(unit, px(4.));
+
+        let (borders, unit) = chrome(SourceKind::Macos);
+        assert!(!borders.buttons && borders.fields && !borders.overlays && borders.focus_ring);
+        assert_eq!(unit, px(4.));
+
+        for source in [SourceKind::Gnome, SourceKind::Omarchy] {
+            let (borders, unit) = chrome(source);
+            assert!(!borders.buttons && !borders.fields && !borders.overlays && borders.focus_ring);
+            assert_eq!(unit, px(6.));
+        }
+
+        let (borders, unit) = chrome(SourceKind::Fallback);
+        assert!(borders.buttons && borders.fields && borders.overlays && !borders.focus_ring);
+        assert_eq!(unit, px(4.));
+    }
+
     #[test]
     fn overlay_is_translucent_and_overridable() {
         let light = resolve(

crates/theme/src/source/kde.rs

@@ -4,7 +4,7 @@
 
 use std::collections::HashMap;
 
-use gpui::Hsla;
+use gpui::{Hsla, Pixels, px};
 
 use crate::system::{PartialPalette, SourceKind, SystemTheme};
 
@@ -14,6 +14,9 @@ pub(crate) struct KdeScheme {
     pub(crate) accent: Option<Hsla>,
     pub(crate) background: Option<Hsla>,
     pub(crate) palette: PartialPalette,
+    /// The root font size parsed from `[General] font=` (family, pointSize,
+    /// pixelSize, ...).
+    pub(crate) root_font_size: Option<Pixels>,
 }
 
 impl KdeScheme {
@@ -54,6 +57,7 @@ impl KdeScheme {
             accent,
             background,
             palette,
+            root_font_size: root_font_size(groups.get("General")),
         }
     }
 
@@ -77,10 +81,17 @@ impl KdeScheme {
                 .unwrap_or(crate::ThemeVariant::Light),
             accent: self.accent.or(portal_accent),
             palette: self.palette,
-            control_radius: None,
-            input_height: None,
-            titlebar_height: None,
-            root_font_size: None,
+            control_radius: Some(px(5.)),
+            overlay_radius: Some(px(5.)),
+            sm_radius: None,
+            control_height: Some(px(33.)),
+            input_height: Some(px(29.)),
+            menu_item_height: Some(px(29.)),
+            switch_height: Some(px(18.)),
+            switch_width: Some(px(36.)),
+            switch_knob: Some(px(18.)),
+            titlebar_height: Some(px(44.)),
+            root_font_size: Some(self.root_font_size.unwrap_or(px(13.33))),
             accessibility,
             source: SourceKind::Kde,
         }
@@ -95,6 +106,22 @@ fn variant_by_lightness(background: Hsla) -> crate::ThemeVariant {
     }
 }
 
+/// The root font size of a `[General]` group's `font=` QFont string.
+fn root_font_size(group: Option<&HashMap<&str, &str>>) -> Option<Pixels> {
+    let fields: Vec<&str> = group?.get("font")?.split(',').map(str::trim).collect();
+    let points = fields.get(1)?.parse::<f32>().ok()?;
+    let pixels = fields
+        .get(2)
+        .and_then(|size| size.parse::<f32>().ok())
+        .unwrap_or(-1.0);
+    let size = if pixels > 0.0 {
+        pixels
+    } else {
+        points * 96.0 / 72.0
+    };
+    (size > 0.0).then(|| px(size))
+}
+
 fn parse_groups(text: &str) -> HashMap<&str, HashMap<&str, &str>> {
     let mut groups: HashMap<&str, HashMap<&str, &str>> = HashMap::new();
     let mut section: Option<&str> = None;
@@ -305,4 +332,31 @@ activeBackground=39,44,49
         let system = scheme.into_system(Default::default(), None, Some(crate::ThemeVariant::Light));
         assert_eq!(system.variant, crate::ThemeVariant::Light);
     }
+
+    #[test]
+    fn the_scheme_states_breeze_metrics_and_the_default_font() {
+        let system = KdeScheme::parse(BREEZE_DARK).into_system(Default::default(), None, None);
+
+        assert_eq!(system.control_height, Some(px(33.)));
+        assert_eq!(system.input_height, Some(px(29.)));
+        assert_eq!(system.menu_item_height, Some(px(29.)));
+        assert_eq!(system.control_radius, Some(px(5.)));
+        assert_eq!(system.overlay_radius, Some(px(5.)));
+        assert_eq!(system.switch_height, Some(px(18.)));
+        assert_eq!(system.switch_width, Some(px(36.)));
+        assert_eq!(system.switch_knob, Some(px(18.)));
+        assert_eq!(system.titlebar_height, Some(px(44.)));
+        assert!((system.root_font_size.unwrap() - px(13.33)).abs() < px(0.01));
+    }
+
+    #[test]
+    fn the_stated_font_beats_the_default() {
+        let text = "[General]\nfont=Noto Sans,10,-1,5,50,0,0,0,0,0\n";
+        let system = KdeScheme::parse(text).into_system(Default::default(), None, None);
+        assert!((system.root_font_size.unwrap() - px(10.0 * 96.0 / 72.0)).abs() < px(0.01));
+
+        let text = "[General]\nfont=Adwaita Sans,-1,12,5,50,0,0,0,0,0\n";
+        let system = KdeScheme::parse(text).into_system(Default::default(), None, None);
+        assert_eq!(system.root_font_size, Some(px(12.)));
+    }
 }

crates/theme/src/source/linux.rs

@@ -5,7 +5,7 @@
 
 use std::path::{Path, PathBuf};
 
-use gpui::Hsla;
+use gpui::{Hsla, Pixels};
 use notify::{RecursiveMode, Watcher};
 
 use super::ThemeSource;
@@ -55,11 +55,12 @@ fn detect(home: &Path, portal_reachable: bool, gsettings_reachable: bool) -> Bac
     }
 }
 
-/// What `gsettings` states for GNOME sessions without a portal.
+/// What `gsettings` states for GNOME sessions.
 #[derive(Clone, Copy, Debug, Default, PartialEq)]
 struct GSettingsSnapshot {
     variant: Option<ThemeVariant>,
     accent: Option<Hsla>,
+    root_font_size: Option<Pixels>,
 }
 
 fn gsettings_value(args: &[&str]) -> Option<String> {
@@ -97,23 +98,31 @@ fn read_gsettings() -> Option<GSettingsSnapshot> {
             "prefer-light" => Some(ThemeVariant::Light),
             _ => None,
         });
+
     let accent = gsettings_value(&["get", "org.gnome.desktop.interface", "accent-color"])
         .and_then(|value| accent_rgb(value.trim().trim_matches('\'')));
 
-    if variant.is_none() && accent.is_none() {
+    let root_font_size = gsettings_value(&["get", "org.gnome.desktop.interface", "font-name"])
+        .and_then(|value| font_root_px(value.trim().trim_matches('\'')));
+
+    if variant.is_none() && accent.is_none() && root_font_size.is_none() {
         return None;
     }
-    Some(GSettingsSnapshot { variant, accent })
+    Some(GSettingsSnapshot {
+        variant,
+        accent,
+        root_font_size,
+    })
+}
+
+fn font_root_px(name: &str) -> Option<Pixels> {
+    let points = name.split_whitespace().last()?.parse::<f32>().ok()?;
+    (points > 0.0).then(|| gpui::px(points * 96.0 / 72.0))
 }
 
 pub(crate) fn platform_source() -> Box<dyn ThemeSource> {
     let portal = portal::io::PortalClient::connect();
-
-    let gsettings = if portal.is_none() {
-        read_gsettings()
-    } else {
-        None
-    };
+    let gsettings = read_gsettings();
 
     let backend = home_dir()
         .map(|home| detect(&home, portal.is_some(), gsettings.is_some()))
@@ -129,6 +138,36 @@ pub(crate) fn platform_source() -> Box<dyn ThemeSource> {
 }
 
 impl LinuxSource {
+    fn gnome_snapshot(
+        &self,
+        variant: ThemeVariant,
+        accent: Option<Hsla>,
+        accessibility: crate::system::AccessibilityPreferences,
+    ) -> SystemTheme {
+        SystemTheme {
+            variant,
+            accent,
+            palette: PartialPalette::default(),
+            control_radius: Some(gpui::px(9.)),
+            overlay_radius: Some(gpui::px(15.)),
+            sm_radius: Some(gpui::px(6.)),
+            control_height: Some(gpui::px(34.)),
+            input_height: Some(gpui::px(34.)),
+            menu_item_height: Some(gpui::px(32.)),
+            switch_height: Some(gpui::px(26.)),
+            switch_width: Some(gpui::px(46.)),
+            switch_knob: Some(gpui::px(20.)),
+            titlebar_height: Some(gpui::px(47.)),
+            root_font_size: Some(
+                self.gsettings
+                    .and_then(|gsettings| gsettings.root_font_size)
+                    .unwrap_or(gpui::px(14.67)),
+            ),
+            accessibility,
+            source: SourceKind::Gnome,
+        }
+    }
+
     fn portal_snapshot(
         &self,
         variant: ThemeVariant,
@@ -136,31 +175,21 @@ impl LinuxSource {
         accessibility: crate::system::AccessibilityPreferences,
     ) -> SystemTheme {
         if let Some(appearance) = portal_appearance {
-            return SystemTheme {
-                variant: appearance.variant(variant),
-                accent: appearance.accent,
-                palette: PartialPalette::default(),
-                control_radius: None,
-                input_height: None,
-                titlebar_height: None,
-                root_font_size: None,
+            return self.gnome_snapshot(
+                appearance.variant(variant),
+                appearance.accent,
                 accessibility,
-                source: SourceKind::Gnome,
-            };
+            );
         }
+
         if let Some(gsettings) = self.gsettings {
-            return SystemTheme {
-                variant: gsettings.variant.unwrap_or(variant),
-                accent: gsettings.accent,
-                palette: PartialPalette::default(),
-                control_radius: None,
-                input_height: None,
-                titlebar_height: None,
-                root_font_size: None,
+            return self.gnome_snapshot(
+                gsettings.variant.unwrap_or(variant),
+                gsettings.accent,
                 accessibility,
-                source: SourceKind::Gnome,
-            };
+            );
         }
+
         SystemTheme::fallback(variant)
     }
 }
@@ -289,4 +318,52 @@ mod tests {
         assert_eq!(detect(&home, true, false), Backend::Kde);
         std::fs::remove_dir_all(&home).expect("cleanup");
     }
+
+    #[test]
+    fn the_gsettings_font_name_states_the_root_font_size() {
+        assert_eq!(
+            font_root_px("Adwaita Sans 11"),
+            Some(gpui::px(11.0 * 96.0 / 72.0))
+        );
+        assert_eq!(
+            font_root_px("Noto Sans 10"),
+            Some(gpui::px(10.0 * 96.0 / 72.0))
+        );
+        assert_eq!(
+            font_root_px("Cantarell Bold 12.5"),
+            Some(gpui::px(12.5 * 96.0 / 72.0))
+        );
+        assert_eq!(font_root_px("Adwaita Sans"), None);
+        assert_eq!(font_root_px("Sans 0"), None);
+    }
+
+    #[test]
+    fn the_gnome_snapshot_states_the_libadwaita_metrics() {
+        let source = LinuxSource {
+            backend: Backend::Portal,
+            portal: None,
+            gsettings: None,
+            file_watcher: None,
+            _signal: None,
+        };
+        let system = source.gnome_snapshot(
+            ThemeVariant::Light,
+            None,
+            crate::system::AccessibilityPreferences::default(),
+        );
+
+        assert_eq!(system.source, SourceKind::Gnome);
+        assert_eq!(system.control_height, Some(gpui::px(34.)));
+        assert_eq!(system.input_height, Some(gpui::px(34.)));
+        assert_eq!(system.menu_item_height, Some(gpui::px(32.)));
+        assert_eq!(system.control_radius, Some(gpui::px(9.)));
+        assert_eq!(system.overlay_radius, Some(gpui::px(15.)));
+        assert_eq!(system.sm_radius, Some(gpui::px(6.)));
+        assert_eq!(system.switch_height, Some(gpui::px(26.)));
+        assert_eq!(system.switch_width, Some(gpui::px(46.)));
+        assert_eq!(system.switch_knob, Some(gpui::px(20.)));
+        assert_eq!(system.titlebar_height, Some(gpui::px(47.)));
+        // The default 11pt font when gsettings states none.
+        assert_eq!(system.root_font_size, Some(gpui::px(14.67)));
+    }
 }

crates/theme/src/source/macos.rs

@@ -22,6 +22,16 @@ use crate::system::{AccessibilityPreferences, PartialPalette, SourceKind, System
 const CONTROL_RADIUS_PTS: f32 = 6.0;
 /// The rounded-bezel text field's intrinsic height at regular size.
 const INPUT_HEIGHT_PTS: f32 = 24.0;
+/// AppKit's regular push button, measured via `NSButton::fittingSize`.
+const CONTROL_HEIGHT_PTS: f32 = 24.0;
+/// The standard `NSMenu` row height.
+const MENU_ITEM_HEIGHT_PTS: f32 = 20.0;
+/// `NSSwitch`, measured via `fittingSize`.
+const SWITCH_TRACK_HEIGHT_PTS: f32 = 24.0;
+const SWITCH_TRACK_WIDTH_PTS: f32 = 54.0;
+const SWITCH_KNOB_PTS: f32 = 20.0;
+/// The standard titled window's titlebar, measured via `contentLayoutRect`.
+const TITLEBAR_HEIGHT_PTS: f32 = 32.0;
 /// The HIG's default body text on macOS is 13 pt (system font size 13 at 1x).
 const ROOT_FONT_SIZE_PTS: f32 = 13.0;
 
@@ -112,8 +122,15 @@ impl ThemeSource for MacosSource {
             accent: Self::color_to_hsla(&NSColor::controlAccentColor()),
             palette,
             control_radius: Some(gpui::px(CONTROL_RADIUS_PTS)),
+            overlay_radius: None,
+            sm_radius: None,
+            control_height: Some(gpui::px(CONTROL_HEIGHT_PTS)),
             input_height: Some(gpui::px(INPUT_HEIGHT_PTS)),
-            titlebar_height: None,
+            menu_item_height: Some(gpui::px(MENU_ITEM_HEIGHT_PTS)),
+            switch_height: Some(gpui::px(SWITCH_TRACK_HEIGHT_PTS)),
+            switch_width: Some(gpui::px(SWITCH_TRACK_WIDTH_PTS)),
+            switch_knob: Some(gpui::px(SWITCH_KNOB_PTS)),
+            titlebar_height: Some(gpui::px(TITLEBAR_HEIGHT_PTS)),
             root_font_size: Some(gpui::px(ROOT_FONT_SIZE_PTS)),
             accessibility,
             source: SourceKind::Macos,

crates/theme/src/source/omarchy.rs

@@ -60,8 +60,15 @@ impl OmarchyTheme {
             variant: self.variant,
             accent: self.accent,
             palette: self.palette,
-            control_radius: None,
-            input_height: None,
+            control_radius: Some(gpui::px(9.)),
+            overlay_radius: Some(gpui::px(15.)),
+            sm_radius: Some(gpui::px(6.)),
+            control_height: Some(gpui::px(34.)),
+            input_height: Some(gpui::px(34.)),
+            menu_item_height: Some(gpui::px(32.)),
+            switch_height: Some(gpui::px(26.)),
+            switch_width: Some(gpui::px(46.)),
+            switch_knob: Some(gpui::px(20.)),
             titlebar_height: None,
             root_font_size: None,
             accessibility,
@@ -215,6 +222,23 @@ color15 = \"#635d6f\"
         assert_eq!(theme.variant, ThemeVariant::Light);
     }
 
+    #[test]
+    fn omarchy_shares_the_gnome_control_metrics() {
+        let theme = OmarchyTheme::parse(TOKYO_NIGHT).expect("parses");
+        let system = theme.into_system(Default::default());
+
+        assert_eq!(system.control_height, Some(gpui::px(34.)));
+        assert_eq!(system.input_height, Some(gpui::px(34.)));
+        assert_eq!(system.menu_item_height, Some(gpui::px(32.)));
+        assert_eq!(system.control_radius, Some(gpui::px(9.)));
+        assert_eq!(system.overlay_radius, Some(gpui::px(15.)));
+        assert_eq!(system.switch_height, Some(gpui::px(26.)));
+        assert_eq!(system.switch_width, Some(gpui::px(46.)));
+        assert_eq!(system.switch_knob, Some(gpui::px(20.)));
+        assert_eq!(system.titlebar_height, None);
+        assert_eq!(system.root_font_size, None);
+    }
+
     #[test]
     fn non_toml_text_is_rejected() {
         assert!(OmarchyTheme::parse("not a theme").is_none());

crates/theme/src/source/windows.rs

@@ -14,8 +14,18 @@ use crate::system::{AccessibilityPreferences, PartialPalette, SourceKind, System
 
 /// WinUI 11's `ControlCornerRadius`, in pixels at 100% scaling.
 const CONTROL_RADIUS_PX: f32 = 4.0;
+/// WinUI 11's `OverlayCornerRadius`, in pixels at 100% scaling.
+const OVERLAY_RADIUS_PX: f32 = 8.0;
 /// WinUI 11's default text-box height, in pixels at 100% scaling.
 const INPUT_HEIGHT_PX: f32 = 32.0;
+/// The default button height, in pixels at 100% scaling.
+const CONTROL_HEIGHT_PX: f32 = 32.0;
+/// The default menu row: item padding 4/5 + a 20px Body line + 2px item margins.
+const MENU_ITEM_HEIGHT_PX: f32 = 33.0;
+/// ToggleSwitch: a 40x20 track with a 12px resting knob.
+const SWITCH_TRACK_HEIGHT_PX: f32 = 20.0;
+const SWITCH_TRACK_WIDTH_PX: f32 = 40.0;
+const SWITCH_KNOB_PX: f32 = 12.0;
 /// The window caption's height, in pixels at 100% scaling, as Win32 reports it.
 const TITLEBAR_HEIGHT_PX: f32 = 32.0;
 /// WinUI 11's default body text size, in pixels at 100% scaling.
@@ -159,7 +169,14 @@ impl ThemeSource for WindowsSource {
                 ..PartialPalette::default()
             },
             control_radius: Some(gpui::px(CONTROL_RADIUS_PX)),
+            overlay_radius: Some(gpui::px(OVERLAY_RADIUS_PX)),
+            sm_radius: None,
+            control_height: Some(gpui::px(CONTROL_HEIGHT_PX)),
             input_height: Some(gpui::px(INPUT_HEIGHT_PX)),
+            menu_item_height: Some(gpui::px(MENU_ITEM_HEIGHT_PX)),
+            switch_height: Some(gpui::px(SWITCH_TRACK_HEIGHT_PX)),
+            switch_width: Some(gpui::px(SWITCH_TRACK_WIDTH_PX)),
+            switch_knob: Some(gpui::px(SWITCH_KNOB_PX)),
             titlebar_height: Some(gpui::px(TITLEBAR_HEIGHT_PX)),
             root_font_size: Some(gpui::px(ROOT_FONT_SIZE_PX * text_scale as f32)),
             accessibility: self.accessibility(),

crates/theme/src/system.rs

@@ -1,6 +1,6 @@
 //! The normalized snapshot a platform adapter produces.
 
-use gpui::{Hsla, Pixels};
+use gpui::{Hsla, Pixels, px};
 
 use crate::ThemeVariant;
 
@@ -43,6 +43,17 @@ impl SourceKind {
     pub fn scrollbar_autohide(self) -> bool {
         matches!(self, Self::Macos | Self::Omarchy | Self::Gnome)
     }
+
+    /// The base spacing unit:
+    ///
+    /// - GNOME lays out on a 6px grid
+    /// - Other platform on 4px grid
+    pub fn spacing_unit(self) -> Pixels {
+        match self {
+            Self::Gnome | Self::Omarchy => px(6.),
+            _ => px(4.),
+        }
+    }
 }
 
 /// A partial palette with optional colors.
@@ -83,8 +94,22 @@ pub struct SystemTheme {
     pub palette: PartialPalette,
     /// The platform's stated control corner radius, if it has one.
     pub control_radius: Option<Pixels>,
+    /// The platform's stated menu/popover radius, if it has one.
+    pub overlay_radius: Option<Pixels>,
+    /// The platform's stated checkbox radius, if it has one.
+    pub sm_radius: Option<Pixels>,
+    /// The platform's stated control height, if it has one.
+    pub control_height: Option<Pixels>,
     /// The platform's stated text-field height, if it has one.
     pub input_height: Option<Pixels>,
+    /// The platform's stated menu row height, if it has one.
+    pub menu_item_height: Option<Pixels>,
+    /// The platform's stated switch track height, if it has one.
+    pub switch_height: Option<Pixels>,
+    /// The platform's stated switch track width, if it has one.
+    pub switch_width: Option<Pixels>,
+    /// The platform's stated switch knob size, if it has one.
+    pub switch_knob: Option<Pixels>,
     /// The platform's native titlebar height, if it states one.
     pub titlebar_height: Option<Pixels>,
     /// The platform's native root font size, if it has one.
@@ -100,7 +125,14 @@ impl SystemTheme {
             accent: None,
             palette: PartialPalette::default(),
             control_radius: None,
+            overlay_radius: None,
+            sm_radius: None,
+            control_height: None,
             input_height: None,
+            menu_item_height: None,
+            switch_height: None,
+            switch_width: None,
+            switch_knob: None,
             titlebar_height: None,
             root_font_size: None,
             accessibility: AccessibilityPreferences::default(),

docs/CHECKLIST.md

@@ -9,18 +9,20 @@ is the first downstream consumer; its screens drive the order.
 
 ## Next
 
+- [ ] **Platform metric adoption** — update components one at a time
+      through the review gate against the landed theme tokens. The stated
+      metrics and the radius ladder already flow through the size table,
+      so each stop covers border + focus chrome (`Theme::borders`), the
+      spacing unit (`Theme::spacing`), and the component's stated dims:
+      button (the API template) first, then input, select, menu, popover,
+      dialog, toast, tooltip, alert, combobox, command palette, switch;
+      per-platform targets in
+      [platform-metrics-audit.md](platform-metrics-audit.md).
+
 ## Queue — to follow
 
 Gaps surfaced by the signed comparison; ordered by signed's usage.
 
-- [ ] **Platform metric fidelity** — native-sizing pass over the theme and
-      components: stated `control_height` per platform (macOS 24 measured /
-      Windows 32 / GNOME ≈34 / KDE ≈33), Linux root font sizes (GNOME 14.67px,
-      KDE 13.33px), platform overlay/sm radii, per-source border + focus
-      policy (macOS/GNOME borderless fills, Windows/KDE 1px), titlebar
-      heights (GNOME 47), a theme spacing scale, switch/icon calibration;
-      ranked findings in
-      [platform-metrics-audit.md](platform-metrics-audit.md).
 - [ ] **Virtual list** — generic virtualized variable-height rows with a
       scroll handle, promoted from the editor views' pattern over gpui's
       `list`; signed's PR lists and commit diff drive it.
@@ -55,6 +57,13 @@ Gaps surfaced by the signed comparison; ordered by signed's usage.
 - [x] Platform sources — macOS (NSColor), Windows 11 (UISettings), GNOME
       (portal), KDE (kdeglobals), Omarchy (colors.toml), neutral fallback;
       live watchers for each
+- [x] Platform metric fidelity — stated control/input/menu-row/switch
+      metrics and the full radius ladder per platform, Linux root fonts
+      (GNOME gsettings `font-name`, KDE `kdeglobals font=`), per-source
+      border + focus chrome (`Theme::borders`), and a per-platform spacing
+      unit (`Theme::spacing`); findings in
+      [platform-metrics-audit.md](platform-metrics-audit.md). Components
+      adopt the tokens one by one (see Next)
 
 ### icons (`crates/icons`)
 

docs/platform-metrics-audit.md

@@ -229,6 +229,10 @@ density is frozen at a macOS-ish tuning.
 
 ## Recommended changes, in priority order
 
+Landed 2026-11 with two deviations: Omarchy is grouped with GNOME (it
+styles its apps with adwaita), and macOS's titlebar is stated at the
+measured 32pt rather than queried at runtime (28pt on older builds).
+
 1. **State `control_height` per platform** — add `control_height:
    Option<Pixels>` beside `input_height` on `SystemTheme`, reuse the
    ratio-scaling pattern: macOS 24 (measured), Windows 32, GNOME ≈34, KDE
@@ -248,9 +252,11 @@ density is frozen at a macOS-ish tuning.
    queried rather than a drifted floor (32 on current builds, 28 older);
    Windows stays stated.
 6. **Add a minimal spacing scale to `Theme`** driven by a per-platform base
-   unit (GNOME 6, KDE 4/6/8, others 4); route menu/popover paddings, menu
-   item min-height (GNOME 32), and the hardcoded `min_w_`/`max_w` values
-   through it.
+   unit (GNOME 6, KDE 4/6/8, others 4); route menu/popover paddings and menu
+   row min-heights through it — GNOME 32 (published), Windows ≈33 (padding
+   4/5 + a 20px Body line + 2px item margins), KDE ≈29 (max(font, 20px
+   floors) + 1 + 2×4); the hardcoded `min_w_`/`max_w` surface values stay
+   put — they are platform-invariant.
 7. **Calibrate switches and icons per platform** — macOS 54×24, Windows
    40×20 with 12px knob, KDE 36×18; icon 16 on macOS/Windows.