Add resolved appearance engine and paired theme settings
Resolve light, dark and automatic appearance centrally and publish live theme snapshots to native surfaces and the appearance portal. Add paired preset families, custom theme imports, accessibility transforms and contrast-safe transitions. Refine the Settings gallery and Auto controls, move overrides under advanced customization, and share palette-aware switches and circular slider thumbs. Document configuration and include theme licenses and integration coverage.
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# Themes
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The compositor resolves theme files and publishes a versioned snapshot. Native
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apps consume that snapshot; Settings edits references and requests isolated previews.
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## Preset pairs
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| Family | Dark preset | Light preset |
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| --- | --- | --- |
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| Ferese Blue (default) | `ferese-blue` | `ferese-blue-light` |
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| Catppuccin | `catppuccin-mocha` | `catppuccin-latte` |
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| Gruvbox | `gruvbox` | `gruvbox-light` |
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| Rosé Pine | `rose-pine-moon` | `rose-pine-dawn` |
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| Tokyo Night | `tokyo-night` | `tokyo-night-day` |
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| Everforest | `everforest-dark` | `everforest-light` |
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Each variant supplies its own surfaces, tint strength, opacity, blur, borders,
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and shadows. Shared material overrides apply to both appearances; appearance
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specific overrides take precedence. [Palette sources and adjustments](theme-palette-sources.md)
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record the upstream colors and contrast tuning.
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## Configuration
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```kdl
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theme {
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mode "auto"
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family "catppuccin"
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split #false
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file "themes/custom_theme.kdl"
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light {
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preset "ferese-blue-light"
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file "themes/custom_theme_light.kdl"
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material { opacity 0.94; tint-strength 1; }
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}
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dark { preset "ferese-blue"; file "themes/custom_theme_dark.kdl"; }
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schedule { source "schedule"; timezone "system"; light-at "07:00"; dark-at "19:00"; }
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accessibility { increase-contrast #false; reduce-transparency #false; }
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accent "#3D7BE6"
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}
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```
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Paths are relative to the configuration directory. Partial theme files contain
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`theme { colors { accent "#3D7BE6"; } }`, or the token sections directly.
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Merge order is preset, shared file, appearance file, shared inline tokens,
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appearance inline tokens, then accent and accessibility adjustments. Unknown tokens warn; invalid known values reject
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an entire update and retain the last working snapshot.
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## Snapshot
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`ResolvedTheme` contains effective appearance and typed colors, surfaces, material,
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geometry, typography, wallpaper, border paints, and shadow tokens. Base, raised,
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and application backgrounds are separate colors. Selected mode,
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accessibility inputs, requested accent, adjusted accent, warnings, schema version,
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and revision accompany it. Consumers do not infer appearance from brightness.
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Material tokens differ by appearance. Light glass uses full tint strength and
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0.94 default opacity to stay pale over dark wallpapers; dark glass uses a softer
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0.5 tint. Shared material overrides apply to both unless the appearance overrides
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them. Reduce Transparency resolves to solid
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material with zero blur. Increase Contrast transforms text and border colors.
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Accents are adjusted against surfaces independently for each appearance, then
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on-accent text is selected for readability.
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## Scheduling
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Auto selects the most recent light or dark boundary in the configured timezone.
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The interval is circular, so light may start after dark. Equal boundaries are
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invalid. Repeated hours use their first occurrence; skipped hours shift forward
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by the timezone gap. The next transition arms a realtime timer. Resume, timezone
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replacement, and realtime clock jumps trigger recalculation without polling.
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## Transitions
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Prepare the incoming wallpaper before starting a 250 ms eased transition. Decode
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or upload failures and a bounded readiness timeout retain the old wallpaper and
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allow the theme change. Reduced motion switches immediately.
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Surface, tint, border, shadow, and accent colors can transition. Fonts and geometry
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switch atomically. Foregrounds remain readable across dark and light backdrops. Near the neutral
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midpoint, the transition temporarily strengthens material tint instead of fading
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text through the background color. Tests sample primary, muted,
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and on-accent text throughout the transition. Wallpaper changes use prepared
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images rather than a placeholder.
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Publish effective appearance at transition start. The portal emits changed
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`color-scheme`, `accent-color`, `contrast`, and `reduced-motion` values then.
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## Commands
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| Command | Action |
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| --- | --- |
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| `feresectl theme get` | Read the current mode, effective appearance, and colors |
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| `feresectl theme status` | Read warnings and the last reload error |
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| `feresectl theme subscribe` | Stream changes as JSON; no polling |
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| `feresectl theme mode light` | Save Light mode; also accepts `dark` and `auto` |
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| `feresectl theme preview PATH` | Resolve a candidate config without applying it |
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Settings shows six paired previews, with Light on the left and Dark on the right.
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Auto uses a switch in the page header. The adjacent button shows its source and,
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when enabled, the effective appearance. It opens source and schedule controls
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below the gallery, which can be edited before enabling Auto. Enabling Auto
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immediately follows the chosen source; disabling it keeps the current appearance.
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Manual appearance controls are in Control Center. Selecting a family
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applies the matching variant live and offers Undo for five
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seconds. Hovering does not change the desktop. Arrow keys navigate the gallery.
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Enable **Use different themes for light and dark** for two independent galleries.
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Disabling it uses the active family and retains the stored pair. A missing
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variant uses Ferese Blue for that appearance and displays a fallback note.
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**Follow system** reads `org.gnome.desktop.interface color-scheme` and monitors
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changes. `default` and `prefer-light` mean Light; `prefer-dark` means Dark. If the
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setting is unavailable, Ferese uses Dark and displays a note. This source does
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not read Ferese's own appearance portal, avoiding a feedback loop. Sunrise/sunset
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is deferred.
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The gallery’s Import button adds a family to the gallery without selecting it. Give each
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variant an explicit section; omitted tokens inherit Ferese Blue for that
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appearance. For example:
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```kdl
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theme {
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name "My theme"
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light { colors { accent "#8F5300"; }; }
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dark { colors { accent "#CBA6F7"; }; }
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}
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```
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Settings stores the file reference under `theme.custom-themes.<id>.file`.
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The compositor validates it and publishes its palettes alongside built-ins.
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Omit a variant to make a single-variant family. Token-only partial files remain
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supported as shared/per-appearance overrides; imports require explicit variants
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so appearance is never guessed from brightness. Imported and override files
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reload after a short debounce, including saves that replace the file. Invalid
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updates retain the last working theme and produce one desktop notification.
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High contrast, Reduce Transparency and Reduce Motion are in Accessibility.
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Material, accent, font and geometry controls stay visible below the gallery. Theme
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overrides are under Advanced customization, in one file-picker row with a
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Shared/Light/Dark selector; each stored
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reference is retained when selecting another scope. Settings and shell switches
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share the same palette. Switch and slider thumbs stay circular regardless of
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shell corner radius.
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When an older config first adopts mode or preset selection, Ferese moves its
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inline palette into the dark selection and preserves comments. Shared wallpaper,
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font, and geometry settings continue to apply to both appearances. For a wallpaper
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pair, set `background { path "..."; }` inside each appearance or its theme file.
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