forked from unom/punktfunk
enricobuehlerandClaude Fable 5
c8aa3ed48b
The flagship leg of design/pen-tablet-input.md §7: against a HOST_CAP_PEN host the Pencil splits out of the finger path (independent of touch-input mode) into PencilStream — state-full samples with force→pressure, altitude→polar tilt, azimuth (+90° to the wire's north-clockwise convention), Pencil Pro rollAngle→ barrel roll (17.5+), coalesced touches batched ≤8/send for full 240Hz fidelity, and Pencil hover (zOffset>0 distinguishes it from trackpad hover) as in-range samples with distance. Squeeze holds barrel 1, double-tap clicks barrel 2 (the Pencil has no hardware buttons/eraser — these are how host apps get those affordances). Implements the ≤100ms heartbeat wire contract (80ms timer) so a stationary held stroke survives the host's 200ms dead-client failsafe. Toward a pen-less host nothing changes (Pencil stays a finger). Also fixes hostSupportsCursor testing the STALE 0x04 bit — HOST_CAP_CURSOR moved to 0x08 when TEXT_INPUT claimed 0x04; the old test would mistake a text-input host (e.g. Windows) for a cursor grant and double-render the pointer. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>