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Improve performance of stroked SDFs #185162

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#184895
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Improve performance of stroked SDFs#185162
#184895
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gaaclarke
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P2Important issues not at the top of the work liste: impellerImpeller rendering backend issues and features requeststeam-engineOwned by Engine teamtriaged-engineTriaged by Engine team

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@gaaclarke
gaaclarke
opened on Apr 16, 2026

Currently SDFs for strokes are getting calculated twice and combined. According to the math in https://iquilezles.org/articles/distfunctions2d/ the sdf could be calculated once and transformed to a stroke with:

abs(sdf(p)) - half_width

We should make that optimization.

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  1. gaaclarke
    self-assigned this
    on Apr 16, 2026
  2. gaaclarke
    added
    e: impellerImpeller rendering backend issues and features requests
    team-engineOwned by Engine team
    P2Important issues not at the top of the work list
    triaged-engineTriaged by Engine team
    on Apr 16, 2026
  3. auto-submit
    closed this as completedin #184895on Apr 24, 2026
  4. pull
    added a commit that references this issue on Apr 24, 2026

    Handle hairline strokes in UberSDF (flutter#184895)

    5bf85a6

  5. github-actions commented on May 8, 2026

    @github-actions
    github-actionsbot
    on May 8, 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.

  6. github-actions
    locked as resolved and limited conversation to collaborators on May 8, 2026
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