3dtours
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A press anywhere on a mask's outline takes hold of it to turn it, and the turn it asked for was read as an absolute bearing: the direction from the shape's pin to wherever the finger now happened to be. The outline is a grip a hand lands on wherever it likes — a ramp's line runs the whole way across the photo — so the moment a press was set down on it the shape swung round to face that finger. A press on the edge of a ramp lying across the photo stood it upright on a ten-pixel move, and a shape already turned snapped to the angle of the press before it had been dragged at all. The turn is now what the hand turns: the change in bearing about the pin since the press, which on the first move is the press itself. A finger that lands on the outline and stays there leaves the angle exactly as it found it; one that carries the shape round by a quarter turn turns it by a quarter turn, whatever angle it was at to begin with. An ellipse adds that turn to the angle it stores, a ramp spins its two ends about its own middle, and both are measured in the photo's own pixels so the two bearings are the same kind of thing. ponytail: The turn is read against the previous pointer position the drag already keeps, so it costs one subtraction and no state. A pointer that leaves the photo mid-turn keeps the angle it stood at — the rule the brush already follows — and the next move on the picture resumes from the last position that was on it. Verified: tsc clean; mask-probe 52/0 on the dev server and again on 8090 — a press on a ramp's own edge that travels a hundredth of the photo's width leaves the ramp at the angle it was taken hold of at (ends 0.500 and 0.500), and on a shape already turned the same press keeps it upright (0.562,0.260 and 0.558,0.860); a quarter turn of the hand on the edge turns the ramp a quarter of the way round (ends 0.200 and 0.800, one pin, no second shape laid); the pin still takes the shape with the hand to where the hand went (0.560,0.560, no sideways throw); the rim of an ellipse still turns with the hand on it (1 pin); another chip still leaves 0 mask columns and the mask chip brings 1 back; DELETE still takes the chosen shape off the photo with its grade (64 -> 255, then back to 61). Against the code before this change the same probe fails 9, both angle checks among them — the ramp lands at 0.850,0.560 and 0.860,0.562, that is, wherever the finger was. brush-edit 33/0, heal-idle 23/0, heal-zoom-drag 28/0, landing/pro-gate/ award-column/otp-code/tone-curve/hsl-panel/grain-controls/chip-edge/chips-desk/ slider-reset/temp-swatch all ALL PASS, backend 180/0.
RecipesCam web — self-contained stack
A Docker-hosted web build of RecipesCam. Everything it needs is in this folder: move it to another machine, run two commands, and the app is up. It does not need the React Native project around it.
cp .env.example .env
docker compose up -d --build
# → http://localhost:8090
What runs where
| Service | Image | Role |
|---|---|---|
frontend |
nginx:1.27-alpine (built by frontend/Dockerfile) |
Static SPA + /api/ reverse proxy |
api |
node:22-slim (built by backend/Dockerfile) |
Accounts + saved recipes, SQLite on ./data |
frontend resolves api through Docker's embedded DNS and proxies /api/* to
it — that is why the API container is named api and why it is not published on
the host. Only ${WEB_PORT:-8090} is exposed.
Photos never leave the browser. The CanvasKit render pipeline (grade, frame, watermarks, JPEG encode) runs in the visitor's tab; the API only stores recipes as JSON.
Layout
docker-compose.yml the stack
.env.example WEB_PORT
data/ SQLite (created on first run, gitignored)
backend/ Fastify + better-sqlite3 API, own Dockerfile
frontend/ Vite + React + CanvasKit SPA, own Dockerfile + nginx.conf
shared/ vendored copies of the app's types + utils (see below)
src/engine/ skiaShim.ts (CanvasKit) + exportEngine.ts (render pipeline)
+ session.ts (localStorage/IndexedDB studio persistence)
Vendored files
frontend/shared/{types/index.ts,utils/*.ts} are byte-identical copies of
src/types/index.ts and ten src/utils/*.ts files from the React Native
project (@shopify/react-native-skia is aliased to src/engine/skiaShim.ts in
vite.config.ts + tsconfig.json, so those files compile unchanged):
cinemaShader colorUtils defaultRecipes exifWrite frameUtils jpegDpi
paramDefs recipeShare skiaImage toneShader.
The landing page needs no CDN: frontend/public/assets/fonts/*.woff2 are the
seven self-hosted faces behind the three font groups the Themes menu offers
(Plus Jakarta Sans / Inter / JetBrains Mono, Fraunces / Be Vietnam Pro /
Courier Prime, Be Vietnam Pro / Space Mono — all SIL OFL, pulled from Google
Fonts, vietnamese + latin + latin-ext subsets), and
frontend/public/assets/samples/s*.jpg are the six placeholder negatives the
film strip, preset tester and QR card show (swap them for real graded stills
whenever we have them). Its one foreign request is the QR image from
api.qrserver.com, which degrades to an empty slot offline.
When the app changes one of them, copy it back in — the renderer is only "parity" for as long as these stay in sync:
cd <repo>/docker/frontend/shared/utils
cp <repo>/src/utils/<name>.ts .
Operations
docker compose logs -f api # API log
docker compose restart api # after backend/src changes (rebuild: --build)
docker compose down # stop; ./data survives
Backup is the ./data folder — that is the whole database.
Checks
curl -s http://localhost:8090/api/health # {"ok":true}
curl -sI http://localhost:8090/ # 200, index.html
Then open the UI, drop a photo in, and confirm the preview shows the picture and
EXPORT downloads a JPEG that opens. The preview going solid black while the
export still reports a plausible size is the one failure mode worth knowing: it
means the CanvasKit GPU surfaces lost their shared GrDirectContext (see
frontend/src/engine/skiaShim.ts), and with no GPU the raster fallback renders
the same pipeline correctly, just slower.