macOS: a tablet pen's pressure reaches the tools (#852)

An AppKit local event monitor (apps/vectorcraft/src/mac_tablet.rs) reads each mouse and tablet event's pressure and the pen's end before winit's view handles it and writes them into the canvas's StylusFeed. The feed keeps the pressure of each pointer move, and the canvas pairs them with the frame's moves, so a fast stroke keeps its curve and each point its own pressure; mouse event coalescing is off. The eraser end selects the Eraser tool, as on Linux. Ported from PhotoCraft's crates/tablet (pressure and eraser end only).

docs/hardware-parity.md

@@ -1,6 +1,6 @@
 # Hardware parity
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-15 · **Change:** patch (web pen buttons/modifiers preserved, touch-only input left to eframe, session-only palm rejection; tool cursors painted into the window on Wayland, #1652, not run on Linux; borderless title-bar window on Windows, #1758, awaiting confirmation; a window surface larger than 8192 px keeps working, #1459 in part; Linux Display Server preference opens the window through XWayland, #1151) · **Target:** Adobe Illustrator 2026 (30.x)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-24 · **Change:** minor (pen pressure and the pen's eraser end on macOS, read from AppKit's tablet events, #852, not yet tried on a Mac; previously: patch: web pen buttons/modifiers preserved, touch-only input left to eframe, session-only palm rejection; tool cursors painted into the window on Wayland, #1652, not run on Linux; borderless title-bar window on Windows, #1758, awaiting confirmation; a window surface larger than 8192 px keeps working, #1459 in part; Linux Display Server preference opens the window through XWayland, #1151) · **Target:** Adobe Illustrator 2026 (30.x)
 
 What hardware Illustrator uses, per platform, against VectorCraft. Illustrator's side is from its public
 documentation (GPU Performance, touch workspace, pen pressure pages); ours from the code
@@ -11,8 +11,8 @@ documentation (GPU Performance, touch workspace, pen pressure pages); ours from
 
 **~35% (estimated), 25–45 h.** VectorCraft rasterizes the canvas on the CPU (multithreaded `vello_cpu`) and uses
 the GPU only to composite, so any GPU that can show a window works, at the cost of GPU-accelerated preview
-on huge documents. VectorCraft reads pen pressure on Windows, on the web, and on Linux under X11 and XWayland, and it
-reads the pen's eraser end on Linux under X11 and XWayland only.
+on huge documents. VectorCraft reads pen pressure on Windows, on the web, on macOS, and on Linux under X11 and XWayland, and it
+reads the pen's eraser end on macOS and on Linux under X11 and XWayland.
 
 | Feature | Illustrator | VectorCraft macOS | Windows | Linux | Web | Status / hours |
 |---|---|---|---|---|---|---|
@@ -20,9 +20,9 @@ reads the pen's eraser end on Linux under X11 and XWayland only.
 | Multithreaded rendering off the UI thread | partial | yes | yes | yes | single-threaded | beyond Illustrator |
 | Hybrid-graphics GPU choice | automatic | power-saving GPU by default, Preferences › Graphics Processor | same; DX12 then OpenGL; no Vulkan unless asked (#545, #806) | the desktop's GPU | browser | done |
 | Restart on another GPU when the first fails to present | — | yes (#502, #964) | yes | yes | restart on lost device (#369) | done |
-| Pen pressure | yes (Wacom, Windows Ink, macOS tablet events) | **no** (winit reports none, #852) | yes (pointer force via `WM_POINTER`) | under X11 and XWayland (Preferences › Performance › Linux Display Server, #1151, #2028), read from XInput2 raw events (#764); **no** on native Wayland, where winit reports none and the pen may not reach the window (#491) | browser pointer events, with coalesced events; Apple Pencil on iPad (hover, palm rejection: fingers navigate after a pen contact until reload) | partial: 4–8 h for macOS and Wayland (winit 0.31) |
+| Pen pressure | yes (Wacom, Windows Ink, macOS tablet events) | yes, read from AppKit's tablet events before the window gets them (winit reports none), each move of a stroke with its own pressure, mouse event coalescing off (#852; not yet tried on a Mac) | yes (pointer force via `WM_POINTER`) | under X11 and XWayland (Preferences › Performance › Linux Display Server, #1151, #2028), read from XInput2 raw events (#764); **no** on native Wayland, where winit reports none and the pen may not reach the window (#491) | browser pointer events, with coalesced events; Apple Pencil on iPad (hover, palm rejection: fingers navigate after a pen contact until reload) | partial: 2–4 h for Wayland (winit 0.31), plus a check on a Mac |
 | Pen tilt, bearing, barrel rotation (6D Art Pen) | yes, drives brushes | no | no | no | no | missing: 4–8 h after the input layer (#372) |
-| Pen eraser end | yes | no | no | under X11 and XWayland, the eraser end selects the Eraser tool and the tip brings back the tool used before (#764); **no** on native Wayland | no | partial |
+| Pen eraser end | yes | the eraser end (AppKit's tablet proximity events) selects the Eraser tool and the tip brings back the tool used before, as on Linux (#852; not yet tried on a Mac) | no | under X11 and XWayland, the eraser end selects the Eraser tool and the tip brings back the tool used before (#764); **no** on native Wayland | no | partial |
 | Touch gestures (pinch zoom, two-finger pan, rotate view, Touch workspace) | yes (Windows touch, Surface) | trackpad pinch, scroll and rotate | pinch, pan; two-finger tap undo, three-finger redo (#585) | same where winit reports touch | eframe until the first pen contact, then Pointer Events (pen and fingers told apart); long press opens the context menu | partial: touch workspace and touch-screen rotation missing, 3–5 h |
 | Trackpad (smooth scroll, pinch) | yes | yes | precision touchpads | yes | yes | done |
 | HiDPI / Retina, per-monitor scale | yes | yes | yes | yes | yes | done; a window dragged between monitors of different scale can still grow on Windows (#1459, open); the custom title bar's window on Windows stays truly borderless so the pointer lines up with what is drawn (#1791, #1758; awaiting the reporter's confirmation) |
@@ -34,6 +34,7 @@ reads the pen's eraser end on Linux under X11 and XWayland only.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-24 | minor | macOS: an AppKit local event monitor reads each mouse and tablet event's pen pressure and the pen's end before the window gets it and writes them into the canvas's pen feed (#852): each pointer move of a stroke keeps its own pressure, mouse event coalescing is off, and the eraser end selects the Eraser tool. The mapping is unit-tested on every platform and the macOS code type-checks for `aarch64-apple-darwin`; not yet tried on a Mac with a tablet, so the score is unchanged (estimated) |
 | 2026-10-15 | patch | Web review: preserve pen buttons and modifiers; leave fingers to eframe before the first pen contact; remove persistent pen policy. Canvas regression tests cover intermediate moves and long-touch cancellation on native and web input. Physical-device QA pending. |
 | 2026-10-14 | minor | Tool cursors are painted into the window on Wayland (#1652; not run on Linux, #1645 stays open until confirmed); On Windows the custom title bar's window stays truly borderless, so the pointer lines up with what is drawn on systems where the hidden caption offset it (#1791, #1758; awaiting the reporter's confirmation); neither is confirmed on the hardware that reported it, so nothing is marked done |
 | 2026-10-13 | minor | Web: the shell reads pen and finger Pointer Events itself (pen pressure with coalesced events, Apple Pencil hover, palm rejection: after a pen contact fingers only navigate until reload; long press opens the context menu); score unchanged (estimated) |