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Revisit disabled OffscreenCanvas support for Safari #150801

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Revisit disabled OffscreenCanvas support for Safari#150801
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P2Important issues not at the top of the work liste: wasmIssues related to the wasm build of Flutter Web.e: web_skwasmSkwasm rendering backend for webplatform-webWeb applications specificallyteam-webOwned by Web platform teamtriaged-webTriaged by Web platform team

Description

@parlough
parlough
opened on Jun 25, 2024

In flutter-team-archive/engine#41135, usage of OffscreenCanvas was disabled for Safari due to not yet supporting WebGL.

It seems it now works in Safari 17+, with the caveat that only on macOS Sonoma and iOS 17+ derivatives. Not earlier versions of the platforms with Safari 17.

If there's no good way to check for this capability now, this issue can serve as a tracking issue until a major version of Safari releases that only supports OS's with the necessary support.

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  1. parlough
    added
    team-webOwned by Web platform team
    on Jun 25, 2024

  2. yjbanov commented on Jul 11, 2024

    @yjbanov
    yjbanov
    on Jul 11, 2024
    Contributor

    In CanvasKit, the blocker for using OffscreenCanvas in Safari is https://bugs.webkit.org/show_bug.cgi?id=267291. For SkWasm it's also WasmGC support in Safari. SkWasm needs both OffscreenCanvas and WasmGC.

  3. yjbanov
    added
    platform-webWeb applications specifically
    e: web_canvaskitCanvasKit (a.k.a. Skia-on-WebGL) rendering backend for Web
    e: web_skwasmSkwasm rendering backend for web
    triaged-webTriaged by Web platform team
    on Jul 11, 2024

  4. yjbanov commented on Jul 11, 2024

    @yjbanov
    yjbanov
    on Jul 11, 2024
    Contributor

    For CanvasKit specifically we are tracking it in #145420

  5. yjbanov
    added
    P2Important issues not at the top of the work list
    e: wasmIssues related to the wasm build of Flutter Web.
    and removed
    e: web_canvaskitCanvasKit (a.k.a. Skia-on-WebGL) rendering backend for Web
    on Jul 11, 2024
  6. mdebbar
    closed this as a duplicateof [web] Adopt single-context OffscreenCanvas rendering on Safari and Firefox (blocked by slow ImageBitmap transfer) #145420 on Sep 21, 2026

  7. github-actions commented on Oct 5, 2026

    @github-actions
    github-actionsBot
    on Oct 5, 2026 – with GitHub Actions

    This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.

  8. github-actions
    locked as resolved and limited conversation to collaborators on Oct 5, 2026
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    P2Important issues not at the top of the work liste: wasmIssues related to the wasm build of Flutter Web.e: web_skwasmSkwasm rendering backend for webplatform-webWeb applications specificallyteam-webOwned by Web platform teamtriaged-webTriaged by Web platform team

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