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#6923 develops the Camera Raw dialog's preview on the GPU whenever no spatial stage is set, from `per_pixel`'s stages. #5128 adds Calibration (primaries and Shadows tint) to the CPU develop between white balance and Dehaze, which those stages don't run, so with both merged a Calibration-only change previewed unchanged on the GPU while Open applied it. `per_pixel` now returns None when Calibration is set, so the dialog develops on the CPU then. The white and black points stay as they were, so the dialog's points cache is still right once Calibration goes back to neutral. The hardware parity doc and BUG-204-3's note now say so. Co-authored-by: Fabio Lissi <3223836+FabioLissi@users.noreply.github.com> Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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4.5 KiB
Hardware parity
Last reviewed: 2026-10-10 · Last updated: 2026-10-17 · Change: minor (Camera Raw's preview develops its per-pixel stages on the GPU) · Target: Adobe Photoshop 2026
Each hardware feature Photoshop 2026 (27.11.0) uses, per platform, against PhotoCraft. Photoshop
side: its bundle (Metal and OpenCL paths, "Precise Color Management for HDR Display" and EDR
strings, Touch Bar resources, pen pressure/tilt strings) and Adobe's GPU FAQ. PhotoCraft side:
crates/tablet, crates/ui-egui/src/stylus.rs, apps/photocraft/src/gpu_startup.rs,
engine/src/display_color.rs, apps/photocraft/src/monitor_profile.rs.
Summary (estimated): ~50% ready. GPU compositing and colour-managed display are solid; pen input is uneven by platform (Windows lacks tilt/rotation, Wayland is broken) and there is no HDR output. Remaining: 80–150 h (gap G12). Human: tablets (Wacom, XP-Pen, Huion) on each OS and an HDR display to verify.
GPU
| Feature | Photoshop | PhotoCraft | Status |
|---|---|---|---|
| GPU canvas, zoom/pan, rotate view | Metal (macOS), DirectX/OpenCL (Windows) | wgpu 30: Metal, Vulkan, DX12, GL; backend selectable | done |
| GPU compositing of layers, blend modes, effects | partial (Photoshop composites mostly on CPU) | wgpu compositor, ≤ 1/255 vs CPU oracle; Multichannel and > texture-limit regions fall back to CPU | done (ahead in places) |
| GPU filters (Blur Gallery, Liquify, Smart Sharpen, Camera Raw) | yes | CPU (rayon) for filters; GPU for compose and effects. Camera Raw's preview runs its per-pixel stages (white balance to grain) in one wgpu pass, about 2-3 ms vs 11-28 ms on the CPU for the 858×572 proxy, depending on the machine; spatial stages, Calibration and OK still develop on the CPU (#6916) | partial |
| Documents larger than the GPU texture limit | yes (tiled) | CPU fallback; tiling in progress (#49) | partial |
| CPU-only fallback when no GPU | yes, reduced | cpu canvas preference; fails to start without an adapter on some Linux systems (#2519, #2412) |
partial |
| Choosing the GPU on a multi-GPU machine | Preferences › Performance › Use Graphics Processor | Linux only: Preferences › Performance › Advanced › GPU adapter and PHOTOCRAFT_GPU_ADAPTER (#1885); ignored on Windows and macOS |
partial |
| Old / integrated GPUs | yes | black line on Intel HD (#2426), OpenCore Macs fail (#1859), Rgba32Float panic (#2020) | partial |
Pen tablets
| Feature | Photoshop | macOS | Windows | Linux X11 | Linux Wayland | Web |
|---|---|---|---|---|---|---|
| Pressure | yes | yes (AppKit monitor) | yes (WM_POINTER), jumpy (#2046) | yes (XInput2) | via Xwayland only; GNOME 50 pen doesn't click (#2622), KDE (#2297) | yes |
| Tilt | yes | yes | no | yes | no | yes |
| Barrel rotation | yes | yes (not applied to tip angle, #1301) | no | partial | no | yes (twist) |
| Eraser end | yes | yes | no (#2285) | partial | no | partial |
| WinTab driver mode | yes | – | no | – | – | – |
| Pressure curve | Windows Ink / driver | global curve in Preferences (#2195) | same | same | same | same |
Displays and colour
| Feature | Photoshop | PhotoCraft | Status |
|---|---|---|---|
| Colour-managed canvas (document → monitor profile) | yes | yes, folded into the GPU 3D LUT | done |
| Monitor profile detection | per display, live | macOS per display at launch; others sRGB or a chosen .icc | partial |
| HDR / EDR output for 32-bit and HDR images | yes ("Precise Color Management for HDR Display") | no; 8-bit sRGB-encoded canvas texture | missing |
| High-DPI, physical 100% | yes | yes (#1943) | done |
| Multiple monitors: documents in separate OS windows | yes | yes (extra_windows) |
done |
| Panels in separate OS windows | yes | in-app floating only (UI-217-5) | missing |
Input devices
| Feature | Photoshop | PhotoCraft | Status |
|---|---|---|---|
| Trackpad pinch zoom, two-finger pan | yes | yes; pinch scrolls instead in 0.6.0 (#2463) | partial |
| Trackpad rotate (Rotate View) | yes | yes (rotate_view.rs) |
done |
| Touch Bar | yes (Intel Macs) | no | missing (low value) |
| Touch screens (Windows) | yes | basic pointer only | partial |
| 3D mouse, MIDI, Surface Dial | Surface Dial on Windows | no | missing (low value) |
| Scanners (WIA / TWAIN) | WIA menu (Windows) | menu item live; no driver integration | partial |
Revision history
| Date | Change | Summary |
|---|---|---|
| 2026-10-10 | major | First version |
| 2026-10-17 | minor | GPU filters: Camera Raw's preview, per-pixel stages (#6916 step 1) |
| 2026-10-19 | minor | Graphics Adapter choice on Linux (#1885) |