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On Linux under X11, and under XWayland, the X server lists a pen's eraser end as a pointer device of its own, and winit 0.30 hands it to the window as a mouse. Turning the pen over and dragging the eraser end drew with the active tool, for example a Paintbrush stroke. The tablet reader now marks a pen device whose name or XInput type contains "eraser", and Services::stylus carries the pen's end with its pressure. Once a frame while no press is held and the pointer is in the window, the canvas selects the Eraser when the eraser end moves, and it selects the tool used before when the tip moves again. The return goes through Session::switch_tool, so a perspective grid hidden meanwhile stays hidden. A tool chosen while the eraser end stands in stays when the tip comes back. The feed starts afresh when the pen turns over, so a press of one end does not take the pressure the other end last touched with. Native Wayland is unchanged. The switch follows PhotoCraft's sync_eraser_tool (storytold/photocraft#255, and storytold/photocraft#5043 for the cleared tool). Docs: docs/development.md, docs/gaps.md, docs/hardware-parity.md, docs/target-app-parity.md.
43 lines
5.9 KiB
Markdown
43 lines
5.9 KiB
Markdown
# Hardware parity
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> **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)
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What hardware Illustrator uses, per platform, against VectorCraft. Illustrator's side is from its public
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documentation (GPU Performance, touch workspace, pen pressure pages); ours from the code
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(`crates/ui-egui/src/canvas.rs`, `touch.rs`, `graphics.rs`, `crates/render`). Part of
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[target-app-parity.md](target-app-parity.md).
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## Summary
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**~35% (estimated), 25–45 h.** VectorCraft rasterizes the canvas on the CPU (multithreaded `vello_cpu`) and uses
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the GPU only to composite, so any GPU that can show a window works, at the cost of GPU-accelerated preview
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on huge documents. VectorCraft reads pen pressure on Windows, on the web, and on Linux under X11 and XWayland, and it
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reads the pen's eraser end on Linux under X11 and XWayland only.
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| Feature | Illustrator | VectorCraft macOS | Windows | Linux | Web | Status / hours |
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|---|---|---|---|---|---|---|
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| GPU-accelerated canvas (GPU Performance, GPU Preview, GPU anti-aliasing) | Metal, DirectX | CPU raster, GPU composite (wgpu/Metal) | CPU raster, GPU composite (DX12, OpenGL fallback) | CPU raster, GPU composite (Vulkan/GL) | WebGPU, WebGL2 fallback | partial; a GPU renderer spike is pending (M5): 15–25 h |
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| Multithreaded rendering off the UI thread | partial | yes | yes | yes | single-threaded | beyond Illustrator |
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| 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 |
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| Restart on another GPU when the first fails to present | — | yes (#502, #964) | yes | yes | restart on lost device (#369) | done |
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| 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) |
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| Pen tilt, bearing, barrel rotation (6D Art Pen) | yes, drives brushes | no | no | no | no | missing: 4–8 h after the input layer (#372) |
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| 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 |
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| 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 |
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| Trackpad (smooth scroll, pinch) | yes | yes | precision touchpads | yes | yes | done |
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| 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) |
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| Multiple monitors: panels and document windows on another screen | yes | no (one OS window) | no | no | — | missing: 6–10 h (with multiple windows, gap G7) |
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| Display colour profile (proof and display through the monitor's ICC) | yes | no | no | no | — | missing: 3–5 h |
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| 3D GPU rendering (Materials, ray tracing) | yes | — | — | — | — | blocked on 3D (gap G3) |
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## Revision history
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| Date | Change | Summary |
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| 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. |
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| 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 |
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| 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) |
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| 2026-10-13 | minor | A window whose surface is larger than 8192 px (stretched over several monitors, or grown by a drag between monitors of different scale) is configured up to the graphics adapter's limit instead of closing the app (#1495, part of #1459); the window growing during that drag on Windows is still open; not reproduced on a mixed-scale setup |
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| 2026-10-11 | minor | Preferences › Performance › Linux Display Server › X11 (XWayland) opens the window through XWayland on a Wayland session, where pens and dropped files reach the app (#1151); score unchanged (estimated) |
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| 2026-10-10 | major | First checklist from the canvas, touch and graphics code and the open hardware issues |
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