Initial commit: Greenfield architectural analysis (14 files, ~80 pages, 10 parallel research agents)
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# 05 — Input Handling (Keyboard, Pointer, Touch, Focus)
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This chapter covers Greenfield's input handling: keyboard (with xkbcommon in
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browser), pointer, touch, focus management, and how input events travel from
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the browser to native Linux apps via the proxy.
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## Headline
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Greenfield is a **browser-native Wayland compositor**. All seat logic —
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keymap compilation, modifier state, pointer grabs, button/axis dispatch —
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runs **in the browser**, against a **WASM build of libxkbcommon 1.5.0 +
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pixman**. The `compositor-proxy` is *not* a compositor — it is a thin
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libwayland-server bridge that relays Wayland wire messages between the
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browser and native clients and provides file-descriptor shims.
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There is no second xkbcommon on the proxy: the keymap is generated in the
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browser from RMLVO and shipped to the proxy as a real native shm fd via a
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custom `/mkstemp-mmap` WebSocket endpoint. `wl_touch` is advertised but
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**never populated with events** — touch input is collapsed into Pointer
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Events.
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## The Seat abstraction
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`Seat.ts` (in `packages/compositor/src/`) is the `wl_seat` global. It
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aggregates keyboard, pointer, and touch, manages focus, and runs the input
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queue. Each `Seat` has:
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- `Keyboard` (always present)
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- `Pointer` (always present)
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- `Touch` (advertised only if `'ontouchstart' in document.documentElement`,
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but inert — see §Touch below)
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- `InputQueue` — coalesces events and dispatches them on the next RAF
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- `InputOutput` — abstracts FD operations (browser pipes for in-browser
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apps, WebSocket endpoints for native apps via proxy)
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Each seat also tracks:
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- The currently focused `Surface` for keyboard input
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- The currently focused `Surface` for pointer input (transient)
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- The active pointer grab (default, popup, drag, or resize)
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- The active keyboard grab (default or popup)
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## Keyboard — xkbcommon in the browser
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### WASM xkbcommon build
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`libs/compositor-wasm/xkbcommon/build.sh` clones `libxkbcommon 1.5.0`,
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applies a patch (removes tests, shims `strdup`), builds with emscripten
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3.1.46, **embeds the entire xkeyboard-config database** via `--embed-file`,
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exports the keymap/state C API as a single-file ES module.
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The same build approach is used for pixman (for region math).
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### Keymap compilation flow
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The browser, not the proxy, is the source of truth for the keymap. The
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flow is:
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1. Browser receives a keymap config (either default or user-supplied via
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`userShell.actions.setUserConfiguration({ keyboardLayoutName })`).
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2. `Seat.notifyUpdateKeymap(nrmlvo)` is called.
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3. `xkb_context_new` + `xkb_keymap_new_from_names` (WASM calls) compile the
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RMLVO into a keymap.
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4. `xkb_keymap_get_as_string` serializes the keymap as a long string.
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5. `Keyboard.sendKeymap(resource)` is called for each `wl_keyboard`
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resource:
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- `inputOutput.mkstempMmap(new Blob([utf8(keymapString)]))` opens a
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`/mkstemp-mmap` WebSocket, sends the blob, and receives a `ProxyFD {
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handle: <native_fd>, type: 'shm', host: baseURL }`.
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- `keyboardResource.keymap(xkbV1, ProxyFD, size)` is sent to the
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native client.
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6. The proxy deserializes the ProxyFD, looks up the native fd via
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`proxyFDtoNativeFD` (identity when `host === baseURL`), ships it via
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`sendEvents(wlClient, msg, fds)` from the N-API addon —
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`libwayland-server` sends the fd via `SCM_RIGHTS` over the unix-domain
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socket.
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7. The native client's libwayland receives the keymap fd, mmaps it, and
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calls native `xkb_keymap_new_from_string` to compile its own copy.
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So the keymap flows **browser → proxy → native**, not the reverse. This
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is the opposite of what you might expect (since the proxy is on the Linux
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host where xkbcommon natively lives), but it makes sense: the browser is
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the actual compositor and is the one that needs the keymap to translate
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DOM key events to Wayland keycodes.
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### DOM → Wayland key event translation
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Browser DOM `KeyboardEvent` has `event.code` (e.g. `"KeyA"`) and
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`event.key` (the resolved glyph). Greenfield uses **only the physical
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`.code`**, mirroring evdev:
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1. `event.code` is looked up in `EvDevKeyCode` reverse-name-map → evdev
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keycode (e.g. `30` for `KeyA`).
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2. `x11KeyCode = evdevKeyCode + 8` (Linux input protocol offset).
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3. `capsLock` / `numLock` are read from `event.getModifierState(...)`.
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The DOM `.key` glyph is **ignored** — only physical `.code` is used, so
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the same physical key always produces the same evdev keycode regardless
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of layout. This is correct Wayland behavior.
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### Modifier tracking
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Modifier state is tracked entirely via the WASM libxkbcommon state
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machine:
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1. `Seat.updateModifierState` calls `xkb.keyDown(x11)` or
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`xkb.keyUp(x11)`.
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2. Internally, `_xkb_state_update_key` is invoked.
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3. `notifyModifiers` reads `xkb.modsDepressed` / `modsLatched` /
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`modsLocked` / `group` (each a `_xkb_state_serialize_mods` call).
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4. High-level `KeyboardModifier` bits are computed by checking xkb
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mod-indices resolved at keymap-compile time.
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5. `Keyboard.sendModifiers(modsDepressed, modsLatched, modsLocked, group)`
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sends the `wl_keyboard.modifiers` event to the native client.
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### Notable bug
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`Seat.ts` lines 511-513 contain a copy/paste typo:
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`modsLatched = modsLocked` (should be `= modsLatched`). The cached
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`keyboard.modifiers` struct is unreliable but doesn't affect protocol
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output because `notifyModifiers` reads from `xkb` directly each time.
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## Pointer
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### DOM → Wayland pointer events
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Browser DOM `MouseEvent` is converted to Greenfield's internal
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`ButtonEvent` / `AxisEvent`:
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- `pointermove` → `createButtonEventFromMouseEvent` → `ButtonEvent`
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(motion-only)
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- `pointerdown` / `pointerup` → `ButtonEvent` (with button + state)
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- `wheel` → `createAxisEventFromWheelEvent` → `AxisEvent`
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### Pointer enter / leave between surfaces
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`DefaultPointerGrab.focus()` runs on every motion event:
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1. `Renderer.pickView` walks the view stack front-to-back.
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2. Returns the first view whose `Surface.isWithinInputRegion(point)`
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(pixman-WASM region) is true.
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3. On change, `Pointer.setFocus` emits `wl_pointer.leave` + `frame` to
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the old surface, then `wl_pointer.enter` + `frame` (+ modifiers if
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keyboard is grabbed) to the new surface.
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### Pointer capture / window leave
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- `canvas.setPointerCapture` is called on `pointerdown`.
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- `pointerleave` calls `notifyKeyboardFocusOut` (saves keyboard focus,
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releases depressed keys, sets `needFocusInit=true` for re-sync),
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resets `buttonCount=0`.
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- DnD suppresses this handler mid-drag.
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### Pointer acceleration / cursor images
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**No acceleration** — verbatim `offsetX/Y`.
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Cursor images are **CSS `cursor: url(data:...) x y, auto`**:
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1. Native client calls `wl_pointer.set_cursor`.
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2. The cursor surface commits a buffer.
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3. `CursorRole` draws the bitmap to a hidden canvas.
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4. `toDataURL()` produces a data URL.
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5. Set on `document.body.style.cursor`.
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OS composites the cursor. No rotation/scale transforms.
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### Scroll wheel / touchpad
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`WheelEvent.deltaMode`:
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- `DOM_DELTA_LINE × 12` — discrete wheel clicks
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- `DOM_DELTA_PAGE × surface size` — page-sized scrolls
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- `DOM_DELTA_PIXEL ÷ 3` — fine-grained touchpad
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Each non-zero axis → `wl_pointer.axis(time, axis, Fixed)`. Wayland version
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≥5 also gets `axis_source(wheel)` + `frame()` (groups events).
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No `axis_discrete` / `value120` / `axis_stop` events are sent.
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### Linux button codes
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DOM `event.button` (0=left, 1=middle, 2=right, 3=back, 4=forward) is
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mapped to Linux input protocol button codes via the `linuxInput` table
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in `browser/input.ts`.
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## Touch — declared but inert
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`Touch.ts` is a 46-line stub; `browser/input.ts` has no touch listeners.
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`wl_touch` capability is advertised if `'ontouchstart' in
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document.documentElement`, but no events are ever sent. Touch input flows
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through Pointer Events as mouse input.
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**For the user**: if you need real touch support (e.g. for tablets), this
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is a feature you'll have to implement from scratch. The protocol stubs
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exist (via generated `wl_touch` bindings), but no event source populates
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them.
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## Focus management
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### DOM focus
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The `<canvas>` owns keyboard focus permanently (`tabIndex=1`).
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`Keyboard.setFocus(surface)` emits `wl_keyboard.leave` / `enter` between
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native surfaces. Activation is driven by `XdgToplevel` / `ShellSurface`
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activation handlers.
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### DOM → Wayland focus
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- Browser DOM `focus` event → `seat.notifyKeyboardFocusIn()` (restores
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saved focus, re-syncs modifiers).
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- Browser DOM `blur` event → `seat.notifyKeyboardFocusOut()` (saves
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focus, releases depressed keys, sets `needFocusInit=true`).
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### Surface-level focus
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- Click on a surface → `XdgToplevel` activation request →
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`desktopSurface.activate()` → `gainFocus()` (refcounted via
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`focusCount`, fires `surfaceActivationUpdated` event to the user shell
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on 0↔1 transitions).
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- Popup grabs take keyboard + pointer focus via `seat.popupGrabStart`,
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validating the serial against the keyboard/pointer `grabSerial`.
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## Input queue
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`InputQueue.ts` coalesces events and dispatches them on the next RAF
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(`InputQueue.drainQueues`). This batches bursts of input events (e.g. fast
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mouse motion) into a single dispatch, avoiding redundant work.
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The queue is FIFO per event type (motion, axis, key, button). Each
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dispatch calls the appropriate `seat.notify*` method.
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## ASCII event-flow diagram
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```
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┌─────────────────────────────────────────────────────────────────────────────────────┐
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│ BROWSER (DOM) │
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│ │
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│ <canvas tabIndex=1> ─┐ │
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│ pointermove/dn/up ───┤── createButtonEventFromMouseEvent() ── ButtonEvent │
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│ wheel ────┤── createAxisEventFromWheelEvent() ── AxisEvent │
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│ keydown / keyup ────┤── createKeyEventFromKeyboardEvent() ── KeyEvent │
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│ │ • evdevKeyCode = EvDevKeyCode[event.code] │
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│ │ • x11KeyCode = evdevKeyCode + 8 │
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│ │ • capsLock/numLock = event.getModifierState(...) │
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│ pointerleave / blur ──┤── seat.notifyKeyboardFocusOut() (saves focus, resets mods) │
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│ focus ────┴── seat.notifyKeyboardFocusIn() (restores saved focus) │
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└──────────────────────────────┬──────────────────────────────────────────────────────┘
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│ session.inputQueue.queue{Motion,Axis,Key,Button}
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▼
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┌─────────────────────────────────────────────────────────────────────────────────────┐
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│ BROWSER COMPOSITOR (InputQueue.drainQueues, scheduled on next animation frame) │
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│ │
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│ seat.notifyMotion / notifyAxis / notifyButton / notifyKey / notifyFrame │
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│ │ │
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│ ├─► Seat.notifyKey ─► Keyboard.grab.key(event) │
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│ │ └─ Keyboard.sendKey(event) │
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│ │ └─ keyboardResource.key(serial,time,evdev,st) │
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│ │ │
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│ ├─► Seat.notifyButton ─► runButtonBindings + grab.button(event) │
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│ │ └─ Pointer.sendButton │
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│ │ └─ pointerResource.button(serial,time, │
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│ │ linuxInput[btn], state) │
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│ │ │
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│ ├─► Seat.notifyMotion ─► grab.motion ─► Pointer.moveTo / sendMotion │
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│ │ └─ pointerResource.motion(time, sx_f, sy_f) │
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│ │ │
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│ ├─► Seat.notifyAxis ─► grab.axis ─► Pointer.sendAxis │
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│ │ deltaMode→scale: line=×12, page=×surface-size, pixel=÷3 │
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│ │ └─ pointerResource.axis(time, axis, Fixed) │
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│ │ + axisSource(wheel) + frame() if v>=5 │
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│ │ │
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│ ├─► Seat.notifyFrame ─► pointerResource.frame() (groups events) │
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│ │ │
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│ └─► Seat.notifyModifiers ─ xkb.keyDown/Up(x11) ─► xkb_state_serialize_mods │
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│ └─ Keyboard.sendModifiers(modsDepressed,Latched, │
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│ Locked,group) │
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│ │
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│ Keymap path (once per WlKeyboardResource): │
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│ Seat.notifyUpdateKeymap(nrmlvo) → createFromNames(rules,model,layout,variant,opt) │
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│ → xkb_context_new + xkb_keymap_new_from_names (libxkbcommon WASM) │
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│ → xkb_keymap_get_as_string ──► keymapString │
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│ Keyboard.sendKeymap(resource): │
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│ inputOutput.mkstempMmap(new Blob([utf8(keymapString)])) ──► ProxyFD │
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│ keyboardResource.keymap(xkbV1, ProxyFD, size) │
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└──────────────────────────────┬──────────────────────────────────────────────────────┘
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│ client.connection.onFlush(wireMessages)
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│ ─ one big Uint32Array, FDs serialized as ProxyFD JSON
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▼
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┌─────────────────────────────────────────────────────────────────────────────────────┐
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│ WIRE (ARQChannel = KCP-over-WebSocket, packages/compositor/src/remote/Channel.ts) │
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│ Browser ⇄ ReconnectingWebSocket ⇄ Internet ⇄ ws on proxy :SessionController │
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│ Message layout (Uint32Array): │
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│ [0] outOfBandOpcode (0 = in-band) │
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│ [1] eventSerial │
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│ [2] = nFds, then for each fd: [len][JSON bytes, 4-byte aligned] │
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│ then concatenated Wayland wire messages │
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└──────────────────────────────┬──────────────────────────────────────────────────────┘
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│ NativeWaylandClientSession.onMessage
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▼
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┌─────────────────────────────────────────────────────────────────────────────────────┐
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│ PROXY (Node.js, compositor-proxy) │
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│ │
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│ SessionController wss paths: /mkfifo /mkstemp-mmap /read-fd /close-fd │
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│ /read-fd-as-stream /write-fd-as-stream │
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│ /signal /channel /request-keyframe │
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│ │
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│ mkstempMmap(ws): │
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│ receives Blob → Buffer.concat → createMemoryMappedFile(buf) ← native addon │
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│ returns ProxyFD { handle: <native fd>, type: 'shm', host: baseURL } │
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│ │
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│ onWireMessageEvents: │
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│ for each ProxyFD in message: │
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│ nativeFd = webFS.proxyFDtoNativeFD(proxyFD) // just returns .handle │
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│ └─ if proxyFD.host === baseURL → identity │
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│ └─ if foreign host → spawn a bridging pipe + WebSocket │
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│ messageInterceptor.interceptEvent(...) // empty stubs for kbd/ptr/touch │
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│ sendEvents(wlClient, messageBuffer, fdsBuffer) ← libwayland-server addon │
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│ flush(wlClient) │
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└──────────────────────────────┬──────────────────────────────────────────────────────┘
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│ libwayland-server sends wire msg + SCM_RIGHTS FDs
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▼
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┌─────────────────────────────────────────────────────────────────────────────────────┐
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│ NATIVE (Wayland client e.g. weston-terminal, Xwayland app) │
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│ wl_display.fd readable → libwayland-client demarshals │
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│ wl_keyboard.keymap(fd) → mmap(fd) → xkb_keymap_new_from_string (native xkbcommon) │
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│ wl_keyboard.key / enter / leave / modifiers → client app │
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│ wl_pointer.enter / motion / button / axis / frame → client app │
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└──────────────────────────────────────────────────────────────────────────────────────┘
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```
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## Key answers (quick reference)
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| Question | Answer |
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|---|---|
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| DOM→Wayland key event translation | `event.code` (e.g. `"KeyA"`) is looked up in `EvDevKeyCode` reverse-name-map → evdev keycode (e.g. `30`). `x11KeyCode = evdevKeyCode + 8`. DOM `.key` glyph is **ignored** — only physical `.code` is used, mirroring evdev. |
|
||||
| Modifier tracking | Entirely via WASM libxkbcommon state machine. `Seat.updateModifierState` calls `xkb.keyDown/Up(x11)` → `_xkb_state_update_key`, then `notifyModifiers` reads `xkb.modsDepressed/Latched/Locked/group` (each a `_xkb_state_serialize_mods` call). High-level `KeyboardModifier` bits are computed by checking xkb mod-indices resolved at keymap-compile time. |
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| Focus: DOM ↔ native surfaces | The `<canvas>` owns keyboard focus permanently (`tabIndex=1`). `Keyboard.setFocus(surface)` emits `wl_keyboard.leave/enter` between native surfaces. Activation is driven by `XdgToplevel`/`ShellSurface` activation handlers. |
|
||||
| Pointer capture / window leave | `canvas.setPointerCapture` on pointerdown. `pointerleave` calls `notifyKeyboardFocusOut` (saves kbd focus, releases depressed keys, sets `needFocusInit=true` for re-sync), resets `buttonCount=0`. DnD suppresses this handler mid-drag. |
|
||||
| Touch event mapping | **Not implemented.** `Touch.ts` is a 46-line stub; `browser/input.ts` has no touch listeners. `wl_touch` capability is advertised if `'ontouchstart' in document.documentElement`, but no events are ever sent. Touch input flows through Pointer Events as mouse input. |
|
||||
| Pointer enter/leave between surfaces | `DefaultPointerGrab.focus()` runs on every motion: `Renderer.pickView` walks the view stack front-to-back, returns first view whose `Surface.isWithinInputRegion(point)` (pixman-WASM region) is true. On change, `Pointer.setFocus` emits `leave+frame` to old surface, `enter+frame` (+modifiers) to new. |
|
||||
| Pointer acceleration / cursor images | **No acceleration** — verbatim `offsetX/Y`. Cursor images are **CSS `cursor: url(data:...) x y, auto`**: client calls `wl_pointer.set_cursor` → `CursorRole` → draw bitmap to hidden canvas → `toDataURL()` → set on `document.body.style.cursor`. OS composites the cursor. No rotation/scale transforms. |
|
||||
| Scroll wheel / touchpad → `wl_pointer.axis` | `WheelEvent.deltaMode`: `DOM_DELTA_LINE × 12`, `DOM_DELTA_PAGE × surface size`, `DOM_DELTA_PIXEL ÷ 3`. Each non-zero axis → `wl_pointer.axis(time, axis, Fixed)`. v≥5 also gets `axis_source(wheel)` + `frame()`. No `axis_discrete/value120/stop`. |
|
||||
| WASM xkbcommon? | Yes. `libs/compositor-wasm/xkbcommon/build.sh` clones `libxkbcommon 1.5.0`, applies a patch, builds with emscripten 3.1.46, **embeds the entire xkeyboard-config database** via `--embed-file`, exports the keymap/state C API as a single-file ES module. Sibling build does the same for `pixman`. |
|
||||
| Keymap FD workaround for WebSocket | Direction is **browser → proxy**, not the reverse. Browser calls `inputOutput.mkstempMmap(Blob)` → opens `/mkstemp-mmap` WebSocket → proxy creates real native shm fd via `createMemoryMappedFile` addon → returns `ProxyFD {handle: <native_fd>, type: 'shm', host: baseURL}`. Browser sends `wl_keyboard.keymap(format, ProxyFD, size)`; the ProxyFD is **serialized as JSON** in the wire message's `fds[]` array (WebSockets can't pass FDs natively). Proxy deserializes, maps `handle` → native fd via `proxyFDtoNativeFD` (identity when `host === baseURL`), ships via `sendEvents(wlClient, msg, fds)` from the N-API addon — `libwayland-server` sends the fd via `SCM_RIGHTS` over the unix-domain socket. |
|
||||
|
||||
## File reference
|
||||
|
||||
| File | Role |
|
||||
|---|---|
|
||||
| `packages/compositor/src/Seat.ts` | `wl_seat` global, multi-seat support, focus management |
|
||||
| `packages/compositor/src/Keyboard.ts` | `wl_keyboard` impl, keymap, modifiers, key events |
|
||||
| `packages/compositor/src/Pointer.ts` | `wl_pointer` impl, motion, buttons, axis |
|
||||
| `packages/compositor/src/Touch.ts` | `wl_touch` (46-line stub, inert) |
|
||||
| `packages/compositor/src/Xkb.ts` | xkbcommon WASM wrapper |
|
||||
| `packages/compositor/src/KeyEvent.ts` | Key event wrapper |
|
||||
| `packages/compositor/src/ButtonEvent.ts` | Pointer button event wrapper |
|
||||
| `packages/compositor/src/AxisEvent.ts` | Pointer axis (scroll) event wrapper |
|
||||
| `packages/compositor/src/InputQueue.ts` | Event coalescing + RAF dispatch |
|
||||
| `packages/compositor/src/InputOutput.ts` | FD abstraction (browser pipes / WebSocket endpoints) |
|
||||
| `packages/compositor/src/browser/input.ts` | DOM event listeners → Greenfield events |
|
||||
| `packages/compositor/src/browser/pointer.ts` | DOM pointer → wl_pointer |
|
||||
| `libs/compositor-wasm/` | pixman + xkbcommon WASM build |
|
||||
| `packages/compositor-proxy/src/wayland-server.ts` | TS wrapper around wayland-server-addon.node |
|
||||
| `packages/compositor-proxy/src/NativeWaylandClientSession.ts` | Per-client message interceptor |
|
||||
| `packages/compositor-proxy/src/io/` | WebSocket server glue (mkstemp-mmap endpoint etc.) |
|
||||
Reference in new issue
Block a user