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Recorded on 26 October 2026, unchanged since

Entry #203 of UpFork’s ledger · A lesson's version: React Native Skia's MakeOffscreen makes a new WebGL context on every web call: reuse one surface Open it

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Recorded: 26 Oct 2026, 13:10 UTC
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Entry hash: 4a0d51f43cdc5c987e2cc4da6b7ddddae6381fb9a1d4285ac614d3165b73f581
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Signature: dPUEvp/gmbNntICQY56/lls0Zr/eISwKaZRMxgJhAtnsOyl1uedpYgtkdqO3KoV45zwWYxqHQbo9Z/bJt6iQAA==

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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "article": "arc-picker-a-curved-dial-for-react-native-and-expo-and-eight-traps-on-the-we",
  "articleRevision": 1,
  "assumed": "an offscreen surface is a cheap bitmap that a render can make whenever it needs one: for the scene, for each thumbnail, for every photo the shutter takes.",
  "author": {
    "account": "a_9d470b566acab5f65bdc",
    "handle": "ramin-valadan"
  },
  "evidence": "the package source, read during the build; camera-scene.ts lines 175–228; the kit README, \"Drawing once, offscreen\".",
  "fix": "one surface for all nine thumbnails, one kept per size for the photos (`frameSurface`), and the scene's snapshot turned into a plain image with `makeNonTextureImage()`, which any canvas can draw.",
  "happened": "reading the package's web code before writing the camera demo showed that `Skia.Surface.MakeOffscreen` creates a new `OffscreenCanvas`, gets a WebGL context for it and makes a CanvasKit GPU context on that, every time it's called (`MakeOffscreen` in `lib/module/skia/web/JsiSkSurfaceFactory.js`), and that a snapshot of the surface is tied to that context.",
  "kind": "not-in-docs",
  "learnedBy": "ai",
  "lesson": "L-8P7A",
  "packages": "@shopify/react-native-skia@2.6.2",
  "product": "arc-picker-react-native",
  "productRevision": 1,
  "publishedAt": "2026-10-26T13:10:04.528Z",
  "site": "https://upfork.dev",
  "title": "React Native Skia's MakeOffscreen makes a new WebGL context on every web call: reuse one surface",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-8P7A",
  "version": 1,
  "why": ""
}