Ferese

Ferese is a Wayland scrolling compositor written in Rust with Smithay. Scrolling columns are the default, tree tiling remains available as an optional per-workspace mode, and geometry changes use timestamp-driven animation. See the window-manager specification for the current architecture and milestones.

For a versioned installation alongside Plasma in SDDM, see installation and recovery. Super+Shift+E or feresectl exit logs out immediately; save your work first.

Live configuration

Saving ~/.config/ferese/config.toml (or $XDG_CONFIG_HOME/ferese/config.toml) reloads it automatically. Atomic editor saves are supported and bursts are debounced. Invalid edits keep the last working compositor and shell config; the rejection is logged. Idle watching does not reread the file.

Use feresectl reload-config to reload manually and report validation errors. Live sources are limited to 60 KiB for safe delivery over the private protocol.

Appearance, fonts, wallpaper, animations, keybindings, keyboard layout/repeat, gaps, scrolling focus policy/default widths, and bar geometry reload live. Wallpaper decoding stays off the render thread and keeps the old image until the replacement is ready. Existing windows, widths and layouts are preserved; layout-mode defaults and initial window rules affect new workspaces/windows. Output profiles and touchpad changes apply on reconnect or session restart. The compositor and shell need one initial update/restart to enable this feature.

Session services and locking

[[autostart]] entries run after the compositor's public socket is ready:

[[autostart]]
command = ["awari"]
restart = true

[[autostart]]
command = ["swayidle", "-w", "timeout", "600", "ferese-lock", "before-sleep", "ferese-lock", "lock", "ferese-lock"]
restart = true

Services are session-owned, reaped, and restarted with a five-second retry delay. They receive the correct public Wayland display without private shell privileges. Nested previews skip them unless nested = true is explicitly configured. Autostart changes require a session restart; live config edits do not restart services. Run foreground daemons here, not commands that fork themselves into the background.

Ferese implements ext-session-lock-v1. While locked, only lock surfaces over an opaque fallback are rendered, normal input/shortcuts and IPC are blocked, and screencopy is unavailable. DRM confirmation waits for safe page flips on active outputs. A missing/crashed locker leaves the session locked; it is not an unlock. ferese-lock runs swaylock/swaylock-effects with optional ~/.config/ferese/swaylock.conf, waiting for lock confirmation before daemonizing. The compositor authenticates no passwords itself; authentication belongs to the locker. Validate password unlock in a disposable nested session before enabling automatic locking on a primary session. Crash recovery currently requires ending that session from another VT; there is deliberately no unauthenticated IPC unlock.

Development

Install the native dependencies required by Smithay's winit and GLES backends, then run:

cargo run -p ferese

Pass a client and its arguments after -- to launch it inside Ferese:

cargo run -p ferese -- foot

Set RUST_LOG=ferese=debug for detailed compositor logging.

Super+F toggles decorated maximization inside the workspace (bar and outer gaps remain visible). In scrolling mode this expands the column to full width, keeps it in the strip, and restores its previous width when toggled off. New windows open to its right and scroll into focus. Super+Shift+F toggles true fullscreen (no bar or window decorations). Leaving fullscreen restores the previous maximized/tiled state.

Set FERESE_TRACE_PERFORMANCE=1 to emit five-second per-output summaries under the ferese::render tracing target. Summaries include rendered frames, damaged pixels, average and longest render time, and DRM missed-deadline totals.

The native-client soak runner and its nested/DRM procedure are documented in docs/native-soak-testing.md.

The M7 semantic-effects probe must use a compositor-created private connection. Build it, then grant only the effects capability to that launched process:

cargo build -p ferese-effects-probe
cargo run -p ferese -- --grant-effects -- target/debug/ferese-effects-probe

Add --preview to keep a solid popover visible in the nested compositor:

cargo build -p ferese-effects-probe
cargo run -p ferese -- --backend nested --grant-effects -- \
  target/debug/ferese-effects-probe --preview

Press Super+Enter in the Ferese window to open foot, then move or update the terminal beneath the popover to inspect stacking, rounded clipping, and shadows. Stop the preview with Ctrl+C in the host terminal.

To verify that the private global is absent from the public Wayland socket:

cargo run -p ferese -- target/debug/ferese-effects-probe --expect-hidden

Ferese reads $XDG_CONFIG_HOME/ferese/config.toml, or ~/.config/ferese/config.toml when XDG_CONFIG_HOME is unset. New scrolling columns use half the viewport by default. To make every newly opened column use the full viewport width:

[scrolling]
default_column_width = "full"

default_column_width = 1.0 is equivalent. Super+M switches the active workspace between scrolling and tree modes.

Outer gaps remain visible with one window by default. To intentionally remove them for a lone tiled window:

[layout]
outer_gap = 4.0
smart_gaps = true

Managed-window borders use theme tokens and overlay the window edge without adding inner padding or changing client geometry:

[theme.colors]
border = "#FFFFFF18"
accent = "#5B8CFF"
shadow = "#00000055"

[theme.geometry]
border_width = 1.0
focus_ring_width = 2.0
window_radius = 14.0

[theme.shadow.soft]
offset_y = 4.0
blur = 18.0
opacity = 0.20

[theme.material]
style = "solid" # solid or translucent
blur_radius = 12.0 # logical pixels; translucent only, 0 disables blur

[appearance.inactive_dim]
enabled = true # opt-in; disabled by default
amount = 0.15 # dark tint over unfocused windows, 0–1; 0 disables
duration_ms = 150 # 0 snaps immediately; reduced motion also snaps

Inactive dimming follows window focus with a smooth, interruption-safe fade. Focus-ring paint (including gradients) and width use the same duration_ms, even when dimming is disabled. Focus changes never scale or move the window. Shell buttons fade their hover tint over 120 ms. Both transitions respect animations.speed, animations.enabled, and animations.reduced_motion; click actions remain immediate and settled hover states do not animate. It keeps window opacity intact, respects animated geometry and rounded corners, and leaves shell bars/popovers untouched. Overview temporarily removes dimming.

Material roles use the configured surface color and role-specific shadows. Solid is the default. Translucent adds backdrop blur behind the same surface color, without grain, glossy lighting, saturation boosts, or inset highlights. The radius is clamped to 32 logical pixels. A shader/allocation failure falls back to a plain translucent fill. Shell popovers report rounded card regions; their outer padding and gaps stay transparent. Each surface shares one capture across its cards, so cards do not sample already blurred neighboring cards. Use --preview --regions with the effects probe to inspect two cards over a patterned background, including the sharp gap between them.

[appearance]
corner_radius = 14.0

Shell shadows use restrained logical-pixel presets: panel 1/5/4%, popover and menu 2/8/7%, HUD 1/4/4%, and notification/modal 3/10/9% (vertical offset / blur / opacity). Private effects capabilities remain required; public background-effect requests cannot select these materials.

Fullscreen windows are borderless and shadowless. Other managed windows use GPU rounded clipping, matching rounded focus rings, and an analytic soft shadow. These effects overlay or surround the allocation without adding client padding.

Scrolling keeps windows in stable workspace coordinates and animates the viewport only when focus must be revealed. Set focus_strategy = "center_on_focus" under [scrolling] to center focused columns instead.

Use focus_strategy = "paged" to pack consecutive columns into viewport-sized pages. Half-width columns form pairs, thirds form triples, and full-width columns occupy their own page. Mixed widths and client minimum sizes use their actual allocated widths, including gaps. Focusing within a page keeps it still; crossing a page boundary scrolls to that page. Explicit centering remains in effect until focus changes or the output resizes.

Scrolling controls use Super+R to cycle configured width presets, Super+C to center the focused column, Super+[ to consume the focused window into an adjacent column, and Super+] to expel it. Super+Ctrl+H/J/K/L resizes in the corresponding direction.

Super+Tab toggles the compositor overview. Its live window previews retain their client surfaces, Super+H/J/K/L moves the selection using the presented preview geometry, and clicking a preview activates it without forwarding the selection click to the application.

The shell provides an edge-to-edge libcosmic menu bar backed by the private shell-control connection. Build and preview it nested with:

cargo build --release -p ferese -p ferese-shell
target/release/ferese --backend nested --grant-effects --grant-shell-control -- \
  target/release/ferese-shell

The Ferese mark enters overview, where workspace indicators become available. The active workspace's window list appears on the left, with click-to-focus and a highlighted active window; status controls and day/time sit on the right. The 28px bar has square screen edges, 19px icons, and no border or drop shadow. Window spacing uses the workspace outer gap; top_bar_window_gap under [theme.geometry] adds optional extra space (default 0). Solid and translucent shell surfaces also omit outlines. The dark startup fallback matches the material palette.

The compositor decodes wallpaper in parallel with startup. Small shell surfaces prefer the lightweight software renderer, with GPU rendering available as a fallback. Set ICED_BACKEND=wgpu to explicitly use GPU rendering for shell content. Use release builds when evaluating startup and animation performance; debug image processing is considerably slower.

Resize presentation configures the destination once and coordinates the matching client commits with the workspace motion (300 ms maximum wait). Application content stays at native pixel size; animated bounds crop/reveal it rather than stretching text. A resize-only previous-frame snapshot fades out over 80 ms, with a 64 MiB total snapshot budget and automatic release. All monitors share one elapsed-time animation clock, and window content, clips, borders and shadows use the same physical-pixel edges.

Window borders and focus rings use solid colors by default. Optional linear gradients can be configured independently:

[theme.focus_ring.gradient]
from = "#e5c890"
to = "#b98d58"
angle = 135.0

# Optional unfocused-window gradient:
[theme.border.gradient]
from = "#3e3e43"
to = "#242429"
angle = 90.0

Angles are clockwise in window coordinates: 0 is left-to-right and 90 is top-to-bottom. Both endpoints accept #RRGGBB or #RRGGBBAA. Remove either gradient section to restore its solid theme.colors.accent or border color. Gradients share the existing rounded-border shader and add no animation or extra render pass. Configuration changes reload live.

Overview has a horizontally scrollable workspace strip with live window thumbnails and an accent outline on the workspace shown by each output. Click a workspace to change the window grid without leaving overview; click a window to focus it and exit, or press Escape to dismiss. Only the workspace strip has a tinted surface; the window grid sits directly over the wallpaper. Strip labels use [theme.typography].font_family and rasterize at output scale. The strip fades independently and preserves its opacity on rapid reversals, including when the selected workspace is empty.

Ferese renders [theme.background] wallpapers directly: path selects the image and mode = "fill" or "fit" controls crop/letterboxing. One decoded image and one texture per GPU context serve every output; resizing requires no image reload or full-screen shell buffers. The launched shell receives FERESE_COMPOSITOR_WALLPAPER=1 to disable its redundant wallpaper surfaces. When no valid image path is configured, the shell's existing fallback remains.

Keyboard settings reload live. Direct-session touchpad settings apply on device reconnect or session restart:

[input]
focus_follows_mouse = false
xkb_layout = "us"
xkb_variant = ""
xkb_options = []
repeat_rate = 25
repeat_delay_ms = 600

[input.touchpad]
tap = true
natural_scroll = true
disable_while_typing = true

Touchpad settings apply to libinput devices in the direct DRM session. In the nested backend, the host compositor remains responsible for physical touchpad configuration.

The direct DRM backend selects the first output profile whose listed monitors are all connected. Match either the connector name reported by get-outputs or its persistent EDID-derived identity:

[[output_profiles]]
name = "docked"

[[output_profiles.outputs]]
match = "HDMI-A-1"
mode = "[email protected]"
scale = 1.6
position = [0, 0]

[[output_profiles.outputs]]
match = "eDP-1"
enabled = false

[[output_profiles]]
name = "laptop"

[[output_profiles.outputs]]
match = "eDP-1"
mode = "2880x1800@120"
scale = 1.6
position = [0, 0]

Unspecified connected outputs remain enabled with their preferred mode, scale 1.0, normal transform, and automatic horizontal placement. Supported transforms are normal, rotate_90, rotate_180, rotate_270, flipped, and their rotated flipped variants. Output configuration is applied at startup and on hotplug. Reloaded output profiles take effect on reconnect or session restart; they do not change an already-connected output's mode.

On DRM, closing the laptop lid disables internal panels when a usable external output is available. With no usable external output, the panel stays enabled; Ferese does not change the system's suspend policy. Workspaces are evacuated to a remaining output without merging their windows, and return to their original output when the lid reopens or a disconnected monitor returns. Normal use of an evacuated workspace does not cancel its automatic return.

Commands are argv arrays and are started directly, without a shell. The default Super+Enter binding runs the built-in terminal = ["foot"] command:

[commands]
terminal = ["foot", "--app-id", "terminal"]

[[bindings]]
keys = "Super+Enter"
action = "spawn"
argument = "terminal"

A configured binding replaces the built-in binding with the same normalized chord and match mode. Disable a default explicitly with no action:

[[bindings]]
keys = "Super+Q"
disabled = true

Bindings follow the active layout by default. To bind a keyboard position instead, set match = "physical" and use an XKB physical key name such as AD06. Invalid chords, actions, arguments, duplicate bindings, and missing command references stop startup with an error.

Initial window rules match app_id, exact title, and/or transient status. All matching rules are applied in declaration order; later rules override only the fields they specify. Width or height implies floating placement when floating is omitted:

With floating = true and no explicit dimensions, the application chooses its initial size and Ferese centers that size on its workspace's output. Small dialogs are not forced into a workspace-sized container.

[[window_rules]]
app_id = "org.example.Editor"
workspace = 3
floating = true
width = 900.0
height = 600.0
fullscreen = false

Rules are finalized on the first toplevel commit, before its buffer is presented, and are not re-applied when an application later changes its title.

feresectl controls the running compositor through the same-user socket at $XDG_RUNTIME_DIR/ferese/control.sock. For example:

cargo run -p feresectl -- focus left
cargo run -p feresectl -- workspace 2
cargo run -p feresectl -- get-workspaces
cargo run -p feresectl -- get-outputs

The v0 IPC slice also supports move, resize, move-to-workspace, toggle-floating, toggle-maximized, toggle-fullscreen, toggle-layout, cycle-column-width, center-column, consume, expel, close, get-focused-window, and get-outputs. Requests use versioned, 1 MiB-limited length-prefixed JSON. The runtime directory and socket are restricted to modes 0700 and 0600, and the server rejects peers whose effective UID differs from the compositor's. IPC has a bounded request queue and accepts at most 64 concurrent client connections. get-outputs includes disabled-but-connected monitors, connector and persistent identity matchers, current and available modes with refresh rates, fractional scale, transform, logical position and size, and physical dimensions.

Text-input-v3 is available to applications by default. Input-method-v2 is hidden unless the session explicitly opts in, because an input method can request privileged keyboard access. Enable it only when launching a trusted IME for the session:

FERESE_ENABLE_INPUT_METHOD=1 cargo run -p ferese

Ctrl+Alt+Escape always releases an active client shortcut inhibitor.

Keyboard-shortcut inhibition is hidden unless a trusted VM or remote-desktop session explicitly enables it:

FERESE_ENABLE_SHORTCUT_INHIBIT=1 cargo run -p ferese

The emergency Ctrl+Alt+Escape binding remains available while inhibition is active.

Screen capture is hidden by default. A session that has already made an explicit capture-policy decision can expose screencopy-v1 to its clients with:

FERESE_ENABLE_SCREENCOPY=1 cargo run -p ferese

The current M5 implementation supports one-shot output and region capture into ARGB8888 shared-memory buffers. Cursor overlays are included only when the capture client requests them.

Direct DRM session

Run the hardware backend from a spare TTY, outside another graphical session:

RUST_LOG=ferese=debug cargo run -p ferese -- --backend=drm -- foot

Do not run that command from a terminal inside the active desktop: the direct backend requests control of the seat and primary DRM device. Use Ctrl+Alt+F1–F12 to switch virtual terminals.

M4 validation requires the direct session to:

• start foot and render the same animated tiling workload as the nested path;
• retain keyboard and pointer input;
• pause when switching away and redraw after switching back; and
• log page-flip timing and any missed presentation deadlines on the reference integrated GPU.

The direct path creates an independent render pipeline per connected output and rescans connectors on hotplug. Physical unplug/replug acceptance testing on the reference hardware is still pending.