[Webkit-unassigned] [Bug 260898] New: REGRESSSION (iOS 17 Beta 8) calling getImageData after drawing a getUserMedia video to canvas becomes as slow as 0.5fps

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=260898

            Bug ID: 260898
           Summary: REGRESSSION (iOS 17 Beta 8) calling getImageData after
                    drawing a getUserMedia video to canvas becomes as slow
                    as 0.5fps
           Product: WebKit
           Version: Safari 17
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: shawnlee at infotoo.com
                CC: youennf at gmail.com

Created attachment 467488

  --> https://bugs.webkit.org/attachment.cgi?id=467488&action=review

screencast

Demo : https://t6mcnq.csb.app/

Tested on iPhone 13, the demo requests a video of size 4032x3024 and continuously calls drawImage/getImageData.

It is used to achieve a minimum of 10 frames per second (fps).
However, it is currently only achieving a slow rate of 0.5 fps.
Ideally, I would expect it to achieve 30 fps.

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