[Webkit-unassigned] [Bug 259676] New: safari throw error "Unable to get image data from canvas. Requested size was 640 x 480"

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Mon Jul 31 22:38:17 PDT 2023


            Bug ID: 259676
           Summary: safari throw error "Unable to get image data from
                    canvas. Requested size was 640 x 480"
           Product: WebKit
           Version: Safari 16
          Hardware: iPhone / iPad
                OS: iOS 16
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Canvas
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fishel.feng at zoom.us
                CC: dino at apple.com

Created attachment 467162

  --> https://bugs.webkit.org/attachment.cgi?id=467162&action=review

the core code

In Ipad safari, Just draw a video frame to canvas and call getImageData, sometimes will throw the error occasionally. I found some same issue but no reply. 


In my test case, if I have opened the browser for a long time, the probability of occurrence will become higher. Reload the page is not works, but restart it can be recovered.
It will be easier to trigger with devtools on, but it can be confirmed that even if devtools is never opened, the problem still occurs.

It seems that some of memory for canvas cannot be released. But I have no idea.

I can reproduce the issue in IpadOS15/safari15 and ipados16/safari16. I tried using OffscreenCanvas, it didn't work.

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